JP2013020498A - Electric power simulation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric power simulation system capable of determining whether present contracts of such as current capacity needs to be changed, and what change is required if necessary when a new load is introduced in a general house.SOLUTION: An electric power simulation system includes: a current measuring device 3 for measuring currents on two voltage lines L1, L2 of a single-phase three-wire cable system electric path 1; and an electric power simulation device 5 for simulating electric power usage for when an EV charger 6 is newly installed on the basis of measured current information. The electric power simulation device 5 has: a storage unit 17 for storing measured current data together with time information; an operation unit 18 for setting a specific time period for the stored current data and adding a constant current value for the time period; a CPU 19 for simulating temporal variation in the current data taking the added current value into consideration; and a monitor 16 for displaying a simulation result. Furthermore, the CPU 19 calculates an electricity charge on the basis of the simulation result.

Description

  The present invention relates to a power simulation system for grasping in advance whether or not it is necessary to change the content of a power supply service contract with a power supply source such as a contract current when installing a new load. The present invention relates to a power simulation system for grasping whether or not it is necessary to change the current contract capacity when installing a charging device for an electric vehicle.

Electric vehicles have begun to spread due to improved performance and environmental awareness. Since an electric vehicle needs to be charged at home unlike a hybrid vehicle, a charging facility is also installed when purchasing an electric vehicle. However, when charging an electric vehicle, it is assumed that a current exceeding 10 amperes will flow for a long time, so it may be preferable to change the service contract that determines the electricity fee to be paid to the power supplier. However, there is currently no device for simulating such a state.
As a conventional electricity bill simulation apparatus, for example, there is a system for calculating an electricity bill by simulating electric power used for a general household as shown in Patent Document 1. In this patent document 1, home appliances provided and their usage status are obtained in a questionnaire format, and the cheapest power supply service is simulated based on this information.

JP 2004-110294 A

  However, in the technique of the above-mentioned Patent Document 1, information on power consumption and usage time of an existing electric device used for determination is obtained through a questionnaire, and thus is not actually power consumed in a dwelling unit. Therefore, when introducing a new load such as an electric vehicle charging device, it is difficult to determine with high accuracy whether the contract needs to be changed or what will happen to the electricity bill when the contract is changed.

  Therefore, in view of such problems, the present invention needs to change the current contract content such as current capacity when introducing a new load such as an electric vehicle charging device in a general house, and if necessary An object of the present invention is to provide a power simulation system that can determine whether or not a change is necessary with high accuracy.

In order to solve the above-mentioned problem, a power simulation system according to the invention of claim 1 includes a current measuring means for measuring currents of two voltage lines of a single-phase three-wire circuit, and measured current data together with time information. The current data storage means for storing, the time zone is set, the condition setting means for setting the current value to be added in the set time zone, and the current data stored in the current data storage means, the current data A simulation means for simulating the time change of current data taking into account the set current value, a comparison means for comparing the current data of the simulation result with the contract current capacity of the power supply source, and displaying the simulation result And display means.
According to this configuration, when a new load is introduced, whether or not the contract current capacity needs to be changed can be determined based on the current power usage status, and therefore, a highly accurate determination can be made. And since the electric current value and operating time zone of the load equipment to introduce can be set up, the simulation at the time of introducing loads, such as an electric vehicle, can be carried out with high accuracy. Therefore, it is possible to recognize in advance the occurrence of a situation in which the power consumption exceeds the contracted capacity and the circuit breaker operates.

According to a second aspect of the present invention, in the configuration according to the first aspect of the present invention, there is provided a power usage amount calculating means for calculating a power usage amount for one month based on the simulation result.
According to this configuration, it is possible to know in advance the amount of power used when a new load facility is introduced, and it is easy to deal with it.

According to a third aspect of the present invention, in the configuration of the second aspect, the power service storage means for storing the contract contents of the power supply service with the power supply source for determining the electricity rate, the calculated power usage amount and the simulation It is characterized by having an electricity bill calculating means for calculating an electricity bill for a contracted power supply service based on the result.
According to this configuration, when a new load is introduced, it is possible to grasp the electricity charges with the current contract contents, and it is easy to deal with them.

According to a fourth aspect of the present invention, in the configuration according to the third aspect, the power service storage unit stores a plurality of types of power supply services provided by a power supply source, and the electricity rate calculation unit includes the plurality of types of power supply services. Electricity charges are calculated for each power supply service.
According to this configuration, it is possible to know the electricity charges for a plurality of power supply services from the simulation result, so it is possible to grasp the power supply service that provides the lowest charge. Therefore, it is convenient to easily determine whether the current contract should be continued or what kind of contract should be changed.

  According to the present invention, when a new load is introduced, whether or not the contract current capacity needs to be changed can be determined on the basis of the current power usage status, and therefore a highly accurate determination can be made. And since the current value of the load to be introduced and the supply time zone can be set, the simulation when introducing an electric vehicle can be carried out with high accuracy, and the situation where the power consumption exceeds the contracted capacity and the circuit breaker operates. Occurrence can be recognized in advance.

It is a block diagram which shows an example of the electric power simulation system which concerns on this invention. It is a flowchart which shows the flow of simulation. It is a screen figure which sets contract contents. It is a screen figure which sets the driving | running condition of EV charger. It is a screen figure which sets the operating conditions of another electric equipment. It is the screen figure which displayed the set simulation conditions. It is an electric current change figure which shows a simulation result. It is a screen figure which shows the determination result by simulation. It is a screen figure which shows the measurement result of an electric current.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing an example of a power simulation system according to the present invention. 1 is a single-phase, three-wire circuit comprising two voltage lines L1, L2 and a neutral line N drawn from a commercial power system. 2 is a distribution board, 3 is a current measuring device for A / D converting and outputting the current value information of the two voltage lines L1 and L2 measured by the current transformers 4 and 4, and 5 is a new load. An electric power simulation apparatus for simulating the electric power charge in the case of the electric charge, 6 is an EV charger provided with an outlet for charging an electric vehicle. This EV charger 6 is a load to be installed from now on, and here, the state of electric power when the EV charger 6 is used is simulated by the simulation device 5.

  In addition, the distribution board 2 includes a main breaker 11 having a leakage prevention function and a plurality of branch breakers 12, 12,... Connected as a load.

  The current measuring device 3 has a plurality of current transformer connection portions (CH1, CH2,...), And current value information continuously input from the current transformer 4 is inputted at a constant time interval (for example, every 1 second). To A / D convert and output together with time information. Here, it is assumed that current information of one voltage line L1 is input to CH1, and current information of the other voltage line L2 is input to CH2.

The power simulation device 5 stores an interface unit (IF) 15 that obtains current data from the current measurement device 3, a monitor 16 that includes an LCD that displays the measured current data and various settings, and the measured current data and setting information. A storage unit 17, an operation unit 18 including a keyboard and a mouse for performing various setting operations, a CPU 19 for controlling each unit of the power simulation apparatus 5 and performing a simulation.
The power simulation apparatus 5 is configured by, for example, a personal computer, and is provided by a power supply source using the power simulation apparatus 5 by setting an operation time zone and an operation current for a newly introduced load. Simulation of the optimum service type and the generated electricity charge among multiple power supply services.

  A specific simulation flow will be described below. FIG. 2 shows a flowchart of the simulation, which will be described based on this flow. First, the current current flowing in the electric circuit 1 is measured for a certain time to grasp the power usage status (S1). The data collection period is preferably measured over about one week, but may be one day (24 hours).

Current data of a certain period measured by the current measuring device 3 is stored in the storage unit 17 together with time information. FIG. 9 shows the current data thus measured. FIG. 9A shows the measurement data of one voltage line L1, and FIG. 9B shows the measurement data of the other voltage line L2, showing the measurement results over one week.
When the current circuit current information is obtained in this way, the power supply service that is currently contracted to determine the electricity rate by setting the power company that is currently contracted by operating the operation unit 18, and The month for simulation is set (S2). The screen diagram of FIG. 3 shows a selection screen for contract details of the power supply service. Here, a contract for the “electric time plan by time zone” service is selected, and the contract capacity is selected to be 6.0 kVA, which is set by a selection operation.

  The power supply source data and the data such as the type and content of the power supply service are stored in the power simulation device 5 in advance, and the power supply service is frequently changed due to changes in oil prices. It is configured so that it can be obtained and updated from a power supply server or the like via a network.

Next, a time zone for adding current and an added value are input (S3). Here, the operating time zone of the load equipment to be introduced and the current during operation are set. FIG. 4 shows a setting screen assuming the case where the EV charger 6 is installed and the electric vehicle is charged. Specifically, the setting is such that the voltage 200V is operated from 23:00 to 5 o'clock and charging is performed at a current 15A during that time. It shows the state.
FIG. 5 shows a setting screen for simultaneously starting other equipment such as air conditioning. Here, a case is shown in which simulation is performed assuming that a device with a voltage of 100 V and a current of 10 A is installed and operated from 10:00 to 16:00.

  As shown in FIG. 4, for the 200V load, the simulation is performed by adding the set current values to the measured currents of both of the two voltage lines L1 and L2. However, as shown in FIG. In this case, the current value set only for one voltage line (here, one voltage line L1 set to CH1) of the two voltage lines L1 and L2 is added. FIG. 6 shows a confirmation screen for the conditions set in this way, where “Chubu Electric Power” is set as the power supply source, and two new loads are newly installed and operated.

When the setting of the load equipment to be installed is completed, the simulation process is started (S4). At this time, the added current value is reflected in the measurement data in the set time zone, and the set current value is added to the change over time of the measured current (S41).
FIG. 7 shows the time change of the current flowing through the electric circuit 1 in consideration of the set current and the actually measured current data shown in FIG. 9, and the current of one week (January 23 to January 29) is shown. It shows a change. In FIG. 7, D <b> 1 indicates individual currents flowing through both voltage lines L <b> 1 and L <b> 2, and D <b> 2 indicates a sum of currents flowing through both voltage lines L <b> 1 and L <b> 2.
Further, in FIG. 7, the current contracted capacity is displayed together (a value converted to a current value as a voltage of 100 V is displayed), and the relationship between the simulated current value and the contracted capacity is recognized from the monitor display. it can.

  Thus, current data reflecting the current of the new load facility is created, the maximum value is determined, and a preferred contract capacity is selected (S42). In this simulation, it can be seen from FIG. 7 that the simulation result of the current data does not exceed the current contract capacity. Then, the amount of electric power used for one month is obtained, and electricity charges are calculated for a plurality of power supply services provided by the current supply source.

As for the power consumption, the average power usage for every hour is calculated, and the power usage for 24 hours is calculated. Thereafter, it is multiplied by 30 (calculated assuming one day as 30 days), and the power consumption for one month is calculated.
When current data for one week is stored, one day is selected according to a predetermined procedure, and the power consumption is calculated. In addition, when current data for one week is stored, the power consumption for one month may be obtained using the entire data for one week actually measured. In this case, after calculating the average power consumption per hour for one week and calculating the power consumption for one week, multiply this value by 4.286 to find 30 days to be one month. It ’s fine.

When the amount of power used for one month is obtained in this way, the power usage fee is calculated according to the contents of a plurality of other power supply services provided in addition to the current power supply service contracted. Then, the basic charge is added to the charge to calculate the electricity charge meter (S43), and the calculation result is displayed on the monitor 16 as shown in FIG. 8 (S5).
In this simulation, since the simulation result of the current data does not exceed the current contracted capacity, it is displayed that the EV charger can be introduced without changing the current contracted capacity as shown in FIG.
In addition, as a recommended contract menu, the electricity charge when the contract is changed to another power supply service is also displayed.

In this way, when a new load is introduced, whether or not the contract current capacity needs to be changed can be determined on the basis of the current power usage status, so that a highly accurate determination can be made. And since the electric current value and operating time zone of the load equipment to introduce can be set up, the simulation at the time of introducing loads, such as an electric vehicle, can be carried out with high accuracy. Therefore, it is possible to recognize in advance the occurrence of a situation in which the power consumption exceeds the contracted capacity and the circuit breaker operates.
In addition, it is possible to know in advance the amount of power used when a new load is introduced, and it is possible to grasp the electricity charges based on the current contract contents, which is easy to deal with.
Furthermore, since the electricity charges for multiple power supply services can be known from the simulation results, it is possible to grasp the power supply service with the lowest charge, and whether to continue the current contract or what contract to change. It is convenient because it is easy to judge whether it is better to change.

  In the above embodiment, the current value information measured by the current measurement device 3 is A / D converted and output. For example, a storage unit that stores measurement data for one week together with time information is provided as a current measurement device. 3, so that it is not necessary to connect the power simulation device 5 at the time of current measurement, so that it is easy to collect data. When the measurement is completed, the measurement data is removed from the distribution board and downloaded to the power simulation apparatus 5 in a lump, thereby facilitating data collection and a simulation operation.

  1 .... Single-phase three-wire circuit 2 .... Distribution panel 3 .... Current measuring device (current measuring means) 4 .... Current transformer (current measuring means) 5 .... Power simulation device 6. · EV charger, 16 ··· Monitor (display means), 17 · · Storage unit (current data storage means, power service storage unit), 18 · · Operation unit (condition setting means), 19 · · CPU (simulating means) Comparison means, power consumption calculation means, electricity charge calculation means).

Claims (4)

Current measuring means for measuring the current of the two voltage lines of the single-phase three-wire circuit;
Current data storage means for storing measured current data together with time information;
Condition setting means for setting a time zone and setting a current value to be added in the set time zone;
Simulating means for simulating the time change of the current data taking into account the set current value with respect to the current data stored in the current data storage means;
A comparison means for comparing the current data of the simulation result with the contracted current capacity of the power supplier,
A power simulation system comprising display means for displaying a simulation result. The power simulation system according to claim 1, further comprising power usage amount calculation means for calculating a monthly power usage amount based on the simulation result. A power service storage means for storing a contract of a power supply service with a power supply source for determining an electricity rate;
3. The electric power simulation system according to claim 2, further comprising an electric charge calculating means for calculating an electric charge for a contracted power supply service based on the obtained electric power consumption and the simulation result. The power service storage means stores a plurality of types of power supply services provided by a power supply source,
4. The electric power simulation system according to claim 3, wherein the electric charge calculating means calculates an electric charge for each of the plurality of types of power supply services.

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