JP2001112176A - Private power generation facility - Google Patents

Abstract

(57) [Summary] The present invention relates to a cogeneration facility having a power generation function, and more particularly to a private power generation facility for supplying power to each section of a house or an apartment house, where a large load such as that of a general home is used. Provided is an in-house power generation device suitable for following load power with respect to fluctuations and a control method thereof. In a private power generation facility comprising: a power generation facility using an internal combustion engine; a power conversion device configured to convert power generated by the power generation facility; and a power storage facility configured to store power generated by the power generation facility. A control device is provided for detecting the output of the power generation facility, the capacity of the power storage facility, and the load power, and controlling the output of the power generation facility according to a change in load.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-house power generation facility suitable for supplying electric power to each section of a house or an apartment house whose demand fluctuates.

[0002]

2. Description of the Related Art Numerous examples of so-called cogeneration facilities for supplying electric power generated by self-generation and heat utilizing waste heat using an internal combustion engine have been proposed. For example, the power demand is 100 kW or more, and the heat demand is
It is a large-scale facility with a capacity of more than 100,000 kcal / h.
As described on page 1-6 of Clean Energy Vol.6 No.12 (Nippon Kogyo Publishing Co., Ltd., 1997), the cogeneration system has a higher energy utilization rate than purchasing electricity and fuel as a heat source separately. It has the advantage of saving energy costs, including electricity and fuel costs, and is expected to be introduced in many facilities in the future. Also, as an example, clean energy Vol.
6 No. 12 (1997 Nippon Kogyo Publishing) page 3 shows the daily load fluctuation, but the ratio between the maximum load and the average is at most about twice. In addition, when viewed only in the daytime, the fluctuation is even smaller, and the power generation can be stopped at night and the vehicle can be operated at an output close to the rated output in the daytime. In many cases, the fluctuations are absorbed by purchasing from the grid of the power company.

As described in the OHM, May 1999, pages 88-89, the base operation mode in which the power generation output is constant is one in consideration of a time period during which a power load generally occurs, such as at night. There is a case where a capacity smaller than the load at this time is introduced. If cogeneration is introduced and operated in this way, the capacity of the generator will be much smaller than the demand of the building, and even if the exhaust heat can be sufficiently utilized, the contribution of cogeneration to the energy load of the whole building The rate is low, and the effect of introducing energy saving and economic efficiency on the consumer is small.

[0004] The second is a case in which reverse power flow is allowed and base operation is performed at a constant output even when power is sold at night. In this case, a large-scale cogeneration can be introduced, and a large energy saving effect can be expected under the condition that exhaust heat can be sufficiently used. However, it is currently cheaper than the unit price of cogeneration, especially at night, so it is not very desirable from an economic point of view. on the other hand,
In small facilities such as homes, the power load fluctuates greatly as shown in the example in FIG. 2, and the ratio of the maximum load to the average load is 3 to
4 times or more. If an attempt is made to respond to such a large load change only by the output fluctuation of the private power generation equipment, the power generation equipment must be operated at an average of 1/3 or less of the rated (maximum) output. The contract of the electric power used in a normal home is 20 to 50 amps at 100 volts, and the maximum is 60 amps. For example, a home with a contract of 40 amps can use a maximum of about 4 kW of power, but on average, The demand is often less than 1/3, often 0.1-1 kilowatt. In this case, in the base operation mode in which the power generation output is constant, the purchase price of the power company is currently lower than the cogeneration power generation unit price for surplus power generated from cogeneration at night, etc. Since the cost is lower, the effect of saving the power purchase fee by the private power generation is reduced.

[0005] Incidentally, as a technique relating to private power generation equipment, Japanese Patent Application Laid-Open No. 8-47175, Japanese Patent Application Laid-Open No. 58-58836,
JP-A-6-38408 and the like are mentioned.

[0006]

As described above, in a small-scale facility such as a home, the ratio between the maximum load and the average load is large, and the load variation is large. Here, even if the in-house power generation equipment using the internal combustion engine is subjected to the base operation in which the power generation output is constant, a large amount of fuel is consumed, which is not very desirable from the viewpoint of economy.

Therefore, when an operation is performed in which the output of the internal combustion engine is changed in accordance with the change in load, it takes several seconds to several minutes for the internal combustion engine to obtain a stable output. For this reason, even if the output of the internal combustion engine is increased when the load suddenly increases, it takes time to reach the required load, and power shortage occurs only with the output of the generator during this time.

It is an object of the present invention to provide an in-house power generation facility with improved follow-up to load power demand fluctuations.

[0009]

In order to achieve the above object, an in-house power generation facility of the present invention comprises: a power generation facility using an internal combustion engine; a power conversion device for converting power generated by the power generation facility; In a private power generation facility having a power storage facility for storing power generated by the power generation facility, an output monitoring unit that monitors an output of the power generation facility, a capacity monitoring unit that monitors a capacity of the power storage facility, and a load power monitor. And a control device for controlling the output of the power generation equipment so as to follow a change in load based on a detection value from each monitoring part.

[0010] The control device may be configured to set an output of the power generation facility to be equal to or more than a sum of a load power output and a difference output between a maximum output usable by the power storage facility as a discharge output and a residual output. It has a part.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a configuration diagram of a private power generation facility according to one embodiment of the present invention. The private power generator is connected to the internal combustion engine 37 and the power generator 5, and the power converter 2, the power line 25, the smoothing capacitor 6, and the power converter 6, in order to shape the output of the power generator and supply AC power to the customer. Apparatus 1
It consists of. The secondary battery 4 is coupled to the smoothing capacitor 6 via the power line 26 via the reactor 40 and the DC power converter 3. The generator 5 is normally used as an electric motor at the time of startup.

The plurality of consumer loads 51 are connected to the normal power system 4
1 (here, connection to the low-voltage distribution line) is passed through the power receiving circuit breaker 42, the power line 43, and the wiring circuit breaker 48, and is distributed to a plurality of load demands by the distribution wiring circuit breaker 49. They are interconnected by a power line 50. The interconnection between the private power generator and the consumer load 51 includes a generator circuit breaker 2.
7. The power distribution circuit breaker 48 is interconnected via the power line 28. In addition, the grid connection to the low-voltage distribution line is, at this time, when a ground fault occurs in the high-voltage distribution line, the distribution line is first cut off by a ground fault relay at the distribution substation,
After that, since the distributed power supply connected to the low-voltage distribution line is operated in an isolated manner, a method of disconnecting it by the isolated operation detection function is effective. In this case, it is necessary to set the time from the occurrence of a ground fault to the disconnection of the distributed power source within one second.

FIG. 1 shows a case where there is no reverse power flow to the system. A CT 44 for current measurement and a PT 45 for voltage measurement are provided on a power line 43, and a reverse power relay 46 and an under-frequency relay 47 are provided. . When a ground fault occurs on the power system 41 side, the reverse power relay 46 and the under-frequency relay 47 detect the fault and trip the power receiving circuit breaker 42 to prevent the islanding operation. . Further, even in the case where there is a reverse power flow, the supply of the private power generator to the high-speed load can be stopped by the gate block of the power converter 1.

The control and measurement system includes a generator output monitoring monitor 21 for monitoring the generator output on a connection line between the generator 5 and the power converter 2, a voltage measurement PT 23 for measuring the voltage of the smoothing capacitor 6, A voltage measurement PT 29 for measuring the voltage of the secondary battery 4 is provided. A power demand monitor 31 that monitors the power demand of the load is installed on the power line 28. Also, a monitor 2 for monitoring the generator output
The signal lines 22, 24, 30, and 32 of the voltage measurement PTs 23 and 29 and the load power demand monitor 31 are connected to a generator output control device 33. Note that a signal line 34 provided in the generator output control device 33 is connected to a fuel pump 36 via a fuel controller 35 so as to control an internal combustion engine 37. In addition, in the internal combustion engine,
A gasoline engine, a diesel engine, a gas engine, a kerosene engine, a rotary engine, and a gas turbine can be applied.

In the private power generator configured as described above, since the load demand is always small, the generator is in the minimum output operation state, but the load demand monitored by the load power demand monitor 31 has increased sharply. In this case, during the first few seconds to several minutes, power is supplied to the load via the power converter 1 by discharging from the secondary battery 4. In the meantime, the generator output control device 33 monitors the battery capacity of the secondary battery 4 from the signal on the signal line 30 connected to the voltage measurement PT 29 and detects the load from the signal on the signal line 32 of the load power demand monitor 31. Monitor and calculate required power. Also, by comparing the output state of the generator 5 from the signal of the signal line 22 of the generator output monitoring monitor 21 or the signal of the voltage signal line 24 of the smoothing capacitor 6 with a necessary power value, an increase output command of the generator output is issued. decide. This output is output to the fuel controller 35
To the generator 5 within seconds or minutes.
Can be set to an optimum operation state corresponding to the load demand. When the output of the generator 5 increases, the secondary battery 4 enters a charging state. In the case where the number of generators is rapidly reduced, the same control is performed, and the generator output control device 33 reduces the output according to the output command.
Can be controlled. The monitoring of the output state of the generator may be performed by monitoring the frequency of the generator (the frequency and the expected power output are in a substantially proportional state) by monitoring the voltage at the outlet of the generator, or by monitoring the DC voltage of the smoothing capacitor 6. Is also good.

At first, if the secondary battery 4 has no remaining capacity, the generator 5 satisfies the remaining capacity of the load in a short time. Is desirable. Further, in order to reduce the capacity of the battery, it is desired to select a generator having a good output response. For example, when the output response and stability are obtained within a few seconds, the capacity of the smoothing capacitor 6 is set to withstand a load demand change of several seconds, so that the capacity of the secondary battery is reduced to the minimum battery only when the generator is started. It can be limited to capacity.

As described above, according to this embodiment, when the generator output is insufficient or exceeds the load demand, the power output is maintained until the generator output is stabilized by the generator output increase / decrease command. The converter 1 and the DC power converter 3 supply power from the battery to the load for a short time, and during that time, the output can be controlled to an appropriate generator output by the output command of the output of the power generation output controller. Therefore, power can be stably supplied to the load, and fuel for the generator can be saved.

FIG. 3 shows the generator output control device 3 shown in FIG.
3 is a detailed view of FIG. The generator output control device 33 includes a generator output monitoring unit 61 that receives the signal lines 22 and 24 as an input, a battery capacity monitoring unit 62 that receives the signal line 30 as an input, and a signal line 32.
And a load power monitoring unit 63 that receives the input. The arithmetic unit 64, the battery capacity monitoring unit 62 and the load power P _L required to enter a monitoring unit 63 for monitoring a generator output P _N, the generator output command P _N0 required generator output: P _N = P _BN + P _L the generator output command: doing arithmetic as P _N0 = P _N + α.

In the above formula, P _BN and α represent “P _BN
= Initial battery output-residual output "and" α = set margin output ".

In the above, it is preferable to set the maximum output that the battery can use as the discharge output as the battery initial output. An operation state is determined by a generator output state comparator 66 using the output of the arithmetic unit 64 and the generator minimum output value (P _G0 ) 65 as inputs. That is, if P _G0> P _N, continue to minimum output operating 67 state, if P _G0> P _N, the input of the comparator 68.

The comparator 66 instructs the minimum operation state of the partial load of the generator. Next, the generator output monitoring section 61 and the comparator 66
Is determined by the second comparator 68 using the output of the second comparator 68 as an input.
That is, if P _G <P _N , the state is the maximum output operation 69 state, and if P _G > P _N , the state is the optimum output operation state 70 as P _G = P _N0 . As described above, by performing the output control by the generator output control device 33, the output of the generator is stably maintained while following the load demand from the partial load of the minimum output operation to the maximum output. be able to.

As described above, according to the present embodiment, since the output of the power generation equipment is controlled to follow the fluctuation of the load, it is possible to generate power in response to the load demand, and
In the case of a low load demand, the minimum output operation can be performed, which has the effect of reducing the fuel cost.

FIG. 4 shows a detailed control example of the power converters 1 and 2 and the DC power converter 3. It includes a generator 5, a power converter 2 (here, functions as a rectifier for rectifying the AC output voltage), and a power converter 1 that receives the DC output voltage and supplies an AC voltage to a load 51. ing. The power converter is a self-excited converter. In the DC portion, a capacitor 6 is provided for absorbing DC ripple and smoothing DC voltage.

According to these configurations, even when the output frequency of the generator 5 fluctuates, it is once converted into DC between the power converters 1 and 2, so that a constant voltage can be obtained without being affected by the fluctuation. Can be supplied for load.
The power conversion device 1 controls a voltage control circuit 9-that controls a difference between a detected value of a voltage output to the load 51 and a command from the means 10 for giving an output voltage command so that the difference becomes small. 1 as the current command value. The difference between the current command value and the detected value of the load current is input to a current control circuit 8-1 for controlling the difference so as to reduce the difference, and is set as a modulated wave command.

The modulation wave command is, for example, as shown in FIG.
Control is performed so that the output voltage of the power converter is switched so as to have a PWM waveform shown in FIG.

Further, with the secondary battery 4 as an input, the DC voltage of the secondary battery 4 is converted to an AC by the power converter 1 at a value slightly lower than the average of the DC voltage generated in the capacitor 6, and then the load is changed. A DC power converter 3 of a semiconductor type that outputs a value sufficiently satisfying the AC voltage required by 51 is provided. When discharging the power of the secondary battery, the DC power conversion device 3 controls the DC voltage between the power conversion device 2 and the power conversion device 1 to be constant.
The difference from the DC voltage command 11 from the means for giving a DC voltage command is input to a voltage control circuit 9-2 for controlling the difference so as to reduce the difference, and is set as a current command. Further, a current control circuit 8 for limiting the output current of the secondary battery, detecting the battery current to protect the battery, and controlling the difference between the detected value and the above-described current command value so that the difference becomes small. 5, and the switching signal is applied to the DC power converter 3 so as to make the DC voltage between the power converters 1 and 2 constant by comparing with the carrier of the triangular wave as in the case of FIG.

When several seconds to several minutes have passed since the generator output increase command was input and the output of the generator 5 was stabilized, the DC voltage output through the power converter 2 (rectifying function) was changed to the DC power converter. 3, the output current from the DC power converter becomes smaller. The battery voltage needs to be maintained at a value that prevents damage to the battery and that can discharge power when the load fluctuates. For this reason, the difference between the battery voltage command 12 from the battery voltage setting means and the detected value of the battery voltage is controlled by a voltage control circuit 9- which controls the difference between the detected value and the above-described current command value so that the difference becomes small. 3 to be a current command. Further, a current control circuit 8 for limiting the input current of the secondary battery, detecting the battery current to protect the battery, and controlling the difference between the detected value and the above-mentioned current command value so as to reduce the difference. -3, and the switching signal is supplied to the DC power converter 3 so as to make the DC voltage between the power converter 1 and the power converter 2 constant by comparing with the carrier of the triangular wave as in the case of FIG. .

The switching signal applied to the DC power converter 3 is used to control the DC voltage between the power converters 1 and 2 at the time of discharging the battery power, to control the battery voltage at the time of charging the battery power, and to increase or decrease the voltage. It is provided through a switching circuit 16. These selections depend on the magnitude relationship between the DC voltage value between 1 and 2 and the output voltage value of the power converter 2 (rectifying function), and the output of the DC power converter 3 is smaller than the output voltage of the power converter 2 When it is larger, the PWM signal 7-2 is used, and when it is larger, the PWM signal 7-3 is used.

When the battery voltage is smaller than the DC voltage output via the power converter 2 (rectifying function) when the generator 5 is stabilized, for example, as shown in FIG. One lower end of the two elements connected in series is connected to the negative electrode of the battery, and the midpoint of the switching element is connected to the anode side of the battery via an inductance. Both ends where two switching elements are connected in series are connected to both ends of a smoothing capacitor 6 between the power converters 1 and 2. P
When discharging battery power using the WM output 7-2,
The lower switching element connected in series is switched in accordance with 7-2. When the switching element is turned on, energy is stored in the inductance. When the switching element is turned off, a voltage higher than the battery voltage is obtained by the battery voltage and the energy of the inductance. Is charged via a diode in the upper switching element. Also, PWM output 7-
When the secondary battery 4 is charged with electric power using the switching element 3, the upper switching element connected in series is switched according to 7-3, and when the switching element is turned on, the electric power of the smoothing capacitor 6 is passed through the inductance. Charge the battery. When the switching element is off, the energy stored in the inductance is circulated through the diode in the lower switching element. By these operations, battery power can be charged and discharged.

By providing the above functions, for example,
When the load demand increases and the generator output becomes insufficient, the power converter 1 and the DC power converter 3 are connected to the secondary battery until the generator output is increased by the generator output increase command and the output is stabilized. 4, power is supplied to the load 51, and when several seconds to several minutes elapse and the output of the generator 5 increases and stabilizes, the output of the generator 5 is output via the power converter 2 and finally the power is output. Since power is supplied to the load 51 by the converter 1, power can be supplied stably.

FIG. 7 shows another control embodiment of the DC power converter 3. Although the DC voltage command value is fixed in FIG. 6, the DC voltage command is
And the output power 17-1 of the power converter 2. Thus, when the load fluctuates and the output capacity increases, the DC voltage command increases, and when the output capacity decreases, the DC voltage command decreases, and the fluctuation is absorbed by the power of the secondary battery 4. can do. This makes it possible to stably supply power to the load for a transient period until the output is stably output in response to the output variable request for the generator 5.

[0032]

According to the embodiment of the present invention, it is possible to provide an in-house power generation facility with improved follow-up to fluctuations in load power demand.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a private power generator according to an embodiment of the present invention.

FIG. 2 is a diagram showing an example of power load fluctuation.

FIG. 3 is a detailed view of a generator control device according to the present embodiment.

FIG. 4 is a detailed control execution diagram corresponding to a load change.

FIG. 5 is an example of output voltage control of the power converter.

FIG. 6 is a diagram showing an embodiment of a DC power converter.

FIG. 7 is a configuration diagram of a control method of the DC power converter.

[Explanation of symbols]

1, 2 ... power converter, 3: DC power converter, 4: secondary battery, 5: generator, 6: smoothing capacitor, 10: output voltage command, 11: DC voltage command, 12: battery voltage command,
16: step-up / step-down switching circuit, 21: monitor for generator output monitoring, 23, 29, 45 ... PT for voltage measurement, 27 ... circuit breaker for generator, 31 ... power demand monitor, 33 ... generator output control device, 35 ... fuel controller, 36 ... fuel pump, 37 ... internal combustion engine, 40 ... reactor, 41 ... power system, 42 ... power receiving circuit breaker, 43 ... power line, 44 ... current measuring CT, 46 ... reverse power relay, 47 ... insufficient Frequency relay, 48: distribution circuit breaker, 49: distribution circuit breaker, 50: power line, 51: customer load, 61: generator control monitoring unit, 6
2 ... Battery capacity monitoring unit, 63 ... Load power monitoring unit, 64 ... Calculation unit, 65 ... Minimum generator output value, 66,68 ... Comparator.

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[Procedure amendment]

[Submission date] November 12, 1999 (1999.11.
12)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction contents]

[0014] As the control measuring system, the generator 5 and the generator output monitor monitors 21 for monitoring the generator output to the interconnection line between the power converter 2 is installed, the power line 28, the power demand of the load A power demand monitor 31 for monitoring is provided. Also, a generator output monitoring monitor 21 and a smoothing
The signal lines 22, 24, 30, and 32 of the capacitor 6, the secondary battery 4 , and the load power demand monitor 31 are connected to a generator output control device 33. A signal line 34 provided in the generator output control device 33 is connected to a fuel controller 35.
The engine is connected to a fuel pump 36 through the controller, and controls the internal combustion engine 37. Note that a gasoline engine, a diesel engine, a gas engine, a kerosene engine, a rotary engine, and a gas turbine can be applied to the internal combustion engine.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0015

[Correction method] Change

[Correction contents]

In the private power generator configured as described above, since the load demand is always small, the generator is in the minimum output operation state, but the load demand monitored by the load power demand monitor 31 has increased sharply. In this case, power is supplied to the load via the power converter 1 by discharging from the secondary battery 4 for the first few seconds to several minutes. Meanwhile, the generator output control device 33 monitors the battery capacity of the secondary battery 4 from the signal on the signal line 30 and monitors the power demand of the load 31.
The load is monitored from the signal from the signal line 32 and the required power is calculated. Also, by comparing the output state of the generator 5 from the signal of the signal line 22 of the generator output monitoring monitor 21 or the signal of the voltage signal line 24 of the smoothing capacitor 6 with a necessary power value, an increase output command of the generator output is issued. decide. By providing this output to the fuel controller 35, the generator 5 can be brought into an optimal operation state corresponding to the demand of the load within several seconds to several minutes. When the output of the generator 5 increases, the secondary battery 4 enters a charged state. The same control is applied to the generator output control device 3 even when the number of generators suddenly decreases.
3 can be controlled by the reduced output command. still,
The monitoring of the output state of the generator may be performed by monitoring the frequency of the generator by monitoring the voltage at the generator outlet (the frequency and the expected power output are in a substantially proportional state) or by monitoring the DC voltage of the smoothing capacitor 6. .

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction contents]

In the above formula, P _BN and α represent “P _BN
= (Initial battery power-remaining battery power) / charging time ",
This represents "α = set margin output".

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Change

[Correction contents]

In the above, the maximum amount of power that the battery can use as a discharge output is preferably set as the battery initial power .
The difference between the initial battery power and the remaining battery power is calculated as
This is the amount of discharge power used as power. An operation state is determined by a generator output state comparator 66 using the output of the arithmetic unit 64 and the generator minimum output value (P _G0 ) 65 as inputs. That is, if P _G0 > P _N , the state of the minimum output operation 67 is continued, and if P _G0 < P _N , the state is set as the input of the comparator 68.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a private power generator according to an embodiment of the present invention.

FIG. 2 is a diagram showing an example of power load fluctuation.

FIG. 3 is a detailed view of a generator control device according to the present embodiment.

FIG. 4 is a detailed control execution diagram corresponding to a load change.

FIG. 5 is an example of output voltage control of the power converter.

FIG. 6 is a diagram showing an embodiment of a DC power converter.

FIG. 7 is a configuration diagram of a control method of the DC power converter.

[Description of Signs] 1, 2 ... power conversion device, 3: DC power conversion device, 4 ... secondary battery, 5 ... generator, 6 ... smoothing capacitor, 10 ... output voltage command, 11 ... DC voltage command, 12 ... Battery voltage command,
16: step-up / step-down switching circuit, 21: monitor for generator output monitoring, 27: circuit breaker for generator, 31: power demand monitor, 33: generator output control device, 35: fuel controller, 36: fuel pump, 37 ... Internal combustion engine, 40 reactor, 41 power system, 42 power receiving circuit breaker, 43 power line, 44 current measuring CT, 45 voltage measuring PT,
46 ... reverse power relay, 47 ... insufficient frequency relay, 48 ...
Power distribution circuit breaker, 49: power distribution circuit breaker, 50: power line, 51
... Consumer load, 61 ... Generator control monitor, 62 ... Battery capacity monitor, 63 ... Load power monitor, 64 ... Calculator, 65
... minimum generator output value, 66,68 ... comparators.

[Procedure amendment 7]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

Continued on the front page (72) Inventor Satoshi Dodo 7-2-1, Omika-cho, Hitachi City, Ibaraki Prefecture Inside Electric Power and Electric Development Laboratory, Hitachi, Ltd. (72) Inventor Kuniyoshi Tsubouchi Omika-cho, Hitachi City, Ibaraki Prefecture No. 2 in Hitachi, Ltd. Power and Electricity Development Laboratory (72) Inventor Yasuaki Akazu 2-1, Omika-cho, Hitachi City, Ibaraki Prefecture Hitachi, Ltd. in Power and Electricity Development Laboratory (72) Inventor Osamu Yokomizo 7-2-1, Omika-cho, Hitachi City, Ibaraki Prefecture F-term in Hitachi, Ltd. Electric Power and Electrical Development Laboratory 5G066 HA15 HB02 HB09 JA02 JA03 JA07 JB03 5H590 AA02 AA21 CA07 CA09 CA21 CC01 CD01 CD03 CE02 CE05 EA01 EA10 EA14 EB07 EB14 EB21 FA01 FA05 FA08 FB02 FC22 FC23 GA02 GA04 GA06 HA01 HA02 HA04 HA06 HB02 HB03 JA08 JB13 JB18

Claims (8)

[Claims] An in-house power generation facility comprising: a power generation facility using an internal combustion engine; a power conversion device for converting power generated by the power generation facility; and a power storage facility for storing power generated by the power generation facility. An output monitoring unit that monitors the output of the power generation facility, a capacity monitoring unit that monitors the capacity of the power storage facility, and a load power monitoring unit that monitors load power, based on a detection value from each monitoring unit And a control device for controlling the output of the power generation equipment so as to follow a change in load. 2. The control device according to claim 1, wherein the output of the power generation equipment is
2. An output setting unit for setting an output to be equal to or more than a sum of a load power output and a difference output between a maximum output and a residual output which can be used as a discharge output by the power storage equipment.
In-house power generation facilities described in 3. An in-house power generation facility comprising: a power generation facility using an internal combustion engine; a power conversion device for converting power generated by the power generation facility; and a power storage facility for storing power generated by the power generation facility. The private power generation equipment, an output detector that detects the output of the power generation equipment, a capacity detector that detects the capacity stored in the power storage equipment, a load power detector that detects load power,
An output control device that controls an output of the power generation equipment based on a detection value detected by each detector, wherein the output control device detects the amount of power detected by the storage amount detector and the load power detector. A computing unit that calculates the required power based on the required power, and the required power calculated by the computing unit is compared with the minimum output of the power generation equipment. If the required power is smaller than the minimum output of the power generation equipment, the power generation equipment And a second output command transmitting unit that drives the output of the power generation equipment to the required power when the required power is greater than the minimum output of the power generation equipment. In-house power generation facilities. 4. A power generating facility using an internal combustion engine, a rectifier for rectifying an output AC voltage of the generator into a DC voltage, and converting the DC into an AC by using the DC voltage as an input and supplying the load to a load. A power converter, a secondary battery that charges the DC voltage rectified by the rectifier, and a DC voltage between the rectifier and the power converter that is set to an output set value of the power generation facility at a set value. An in-house power generation facility including a bidirectional DC power converter that charges the secondary battery with a DC voltage, detecting an output of the power generation facility, a capacity of the power storage facility, and load power, and setting the power generation facility to a predetermined level. An in-house power generation facility comprising an output control device for controlling output. 5. The output control device outputs an output increase command of the power generation equipment when a load demand increases, and supplies an output from the secondary battery to the load by the bidirectional DC power converter. The private power generation equipment according to claim 4, wherein the power is converted into a DC voltage that can obtain a necessary AC voltage and power is supplied to a load. 6. The private power generation facility according to claim 4, wherein the output control device determines the output from the secondary battery in accordance with the power demand of a load. 7. Control of a private power generation facility comprising: a power generation facility using an internal combustion engine; a power conversion device for converting power generated by the power generation facility; and a power storage facility for storing power generated by the power generation facility. In the method, the required power is calculated based on the detected value of the storage equipment capacity and the load power, and the calculated required power is compared with the minimum output of the power generation equipment, so that the required power is the minimum output of the power generation equipment. A method for controlling a private power generation facility, comprising: performing a minimum output operation of the power generation facility when the power is smaller than the minimum power; 8. The method for controlling a private power generation facility, comprising: outputting an output of the power generation facility at least equal to a sum of a load power output and a difference output between a maximum output usable by the power storage facility as a discharge output and a residual output. The method according to claim 7, wherein the control is performed.