CN105655973B - A kind of flexible direct current converter station IGBT valves Room fire prevention measure wavy trajectory - Google Patents

Abstract

The invention relates to a fire protection technology for IGBT valve halls of flexible direct current converter stations, in particular to a tripping mode of fire prevention measures for IGBT valve halls of flexible direct current converter stations, which adopts two types of alarm signals of very early smoke alarm and ultraviolet (infrared) detection at the same time Occurrence is used as the criterion for stopping the flexible DC system. First, as long as one of all very early smoke detectors in the valve hall detects a smoke alarm, and at the same time one of all ultraviolet detectors detects arc light, the logic control protection system is allowed to trip; the second is If smoke is detected at the air inlet, the first logical judgment unit will be blocked. At this time, if two or more ultraviolet probes of the ultraviolet detection system send out alarms at the same time, it is still allowed to control the protection system to trip the outlet. In addition, the trip signal is sent directly to the switch. The redundant DC control and protection system of the flow station does not pass through the central alarm of the fire alarm system. The advantage is that the system can be shut down in a timely and effective manner, equipment damage can be avoided, and the safe and stable operation of the converter station can be ensured.

Description

A tripping method for fire protection measures of IGBT valve hall of flexible DC converter station

technical field

The invention relates to a fire prevention technology for an IGBT valve hall of a flexible DC converter station, in particular to a tripping mode for fire prevention measures for the IGBT valve hall of a flexible DC converter station.

Background technique

Flexible DC transmission is an important equipment for building smart grids. Compared with traditional methods, flexible DC transmission technology uses insulated gate bipolar transistors and composite full-control voltage-driven power semiconductor devices IGBT (InsulatedGate Bipolar Transistor) as converter valves. A new direct current transmission technology. The IGBT converter valve in the flexible DC converter station is an important core electrical equipment of the flexible DC converter station, and the valve hall where the IGBT converter valve is arranged is also an important electrical equipment installation place of the flexible DC converter station. Similarly, people are not allowed to enter the valve hall of the flexible DC converter station during normal operation, and the gate of the valve hall is closed during normal operation.

The corresponding fire prevention measures for the IGBT valve hall of the flexible DC converter station should ensure to the greatest extent that the flexible DC system can be shut down in time when a fire occurs in the valve hall of the converter station, so as to reduce the impact of fire in the valve hall on all electrical equipment in the valve hall, especially the expensive ones. The damage degree of the IGBT converter valve, the fire prevention measures of the valve hall are very important for the safe and normal operation of the converter station. At present, the automatic fire alarm system of the valve hall of the converter valve is a corresponding fire prevention measure for the valve hall of the converter valve that is not allowed to enter during normal operation. When a fire occurs in the valve hall of the IGBT converter valve, the automatic fire alarm system of the valve hall will The fire alarm signal is issued in time and uploaded to the operation control center of the converter station, and the operation control center controls the outage of the flexible DC system. That is to say, the existing fire protection measures for the valve hall of the converter valve are limited to the basic functions of the automatic fire alarm system. When a fire occurs in the valve hall of the IGBT converter valve, it is difficult to shut down the flexible DC system in a timely and effective manner, which may cause damage to the equipment , system paralysis, and even further expansion of the disaster, are extremely unfavorable to the safe and stable operation of the flexible DC converter station.

Contents of the invention

The purpose of the present invention is to provide a fire prevention measure for the IGBT valve hall of a flexible DC converter station that can timely and effectively shut down the system, avoid equipment damage, and ensure the safe and stable operation of the converter station according to the shortcomings of the prior art trip mode.

The stated purpose of the present invention is achieved by the following approaches:

A method for tripping fire protection measures for IGBT valve halls of flexible DC converter stations, the main points of which include the following steps:

Provide an automatic fire alarm system, including a very early smoke detection system, an ultraviolet detection system and a smoke detection probe at the air inlet of the air conditioner. The smoke detector of the very early smoke detection system and the ultraviolet probe of the ultraviolet detection system are covered and distributed on the hall;

The automatic fire alarm system also includes a logic control unit, the logic control unit includes a first logic judgment unit, a second logic judgment unit and a trip control unit, and an induction sending end of the very early smoke detection system and the ultraviolet detection system is connected to In the first logic judging unit, an induction sending end of the smoke detection probe of the air inlet of the air conditioner is connected to the first logic judgment unit through a blocking unit, and the ultraviolet detection system is connected with the other induction sending end of the smoke detection probe of the air inlet of the air conditioner. In the second logic judgment unit, the output terminals of the first logic judgment unit and the second logic judgment unit are connected to the trip control unit, and the trip control unit is connected to the redundant DC control and protection system of the converter station;

When any smoke detector of the very early smoke detection system senses smoke, and at the same time any ultraviolet probe of the ultraviolet detection system senses an arc or an open flame, both the very early smoke detection system and the ultraviolet detection system send signals to the first logic judgment unit, After receiving the two signals, the first logic judgment unit sends a trigger signal to the trip control unit, and the trip control unit sends a trip command to the DC control and protection system;

When the smoke detection probe at the air inlet of the air conditioner senses the smoke, it sends a signal to the blocking unit, and the first logic judgment unit is blocked by the blocking unit; at the same time, the smoke detection probe at the air inlet of the air conditioner sends a signal to the second logic judgment unit. If two or more ultraviolet probes in the detection system sense arcs or open flames, the ultraviolet detection system will also send a signal to the second logic judgment unit, and the second logic judgment unit will receive the smoke detection probe and the ultraviolet detection probe from the air inlet of the air conditioner. After the signal sent by the system, the trip command is sent to the DC control and protection system through the trip control unit.

The ultraviolet detection system of the present invention can also be replaced by an infrared detection system, both of which are sensitive to open flames and arcs, and can easily sense and detect arcs or open flames, while the very early smoke detection system is sensitive to smoke. The present invention uses two sets of logic judgment units to achieve the purpose: one is that as long as one of all the very early smoke detectors in the valve hall detects a smoke alarm, and at the same time one of all the ultraviolet probes in the valve hall detects arc light, when the above When the two conditions are met at the same time, the control and protection system is allowed to trip; the second is that if the very early sensor at the air inlet detects smoke, the very early system trip outlet circuit is blocked, that is, the first logic judgment unit is blocked to avoid accidents caused by accidents outside the valve hall. Environmental factors cause the malfunction of the automatic fire alarm system. In addition, if the ultraviolet detection system has two or more ultraviolet probes that issue alarms at the same time when the sensor detects smoke at the very early stage at the air inlet, it is still allowed to control the protection system to trip the outlet.

Install a smoke detection probe at the air inlet of the air conditioner in the valve hall, and activate the setting function of the reference value of the background smoke concentration in the surrounding environment, which can effectively prevent the misoperation of the smoke detection system in the very early stage of the valve hall caused by the smoke generated by external straw burning. The simultaneous occurrence of two types of alarm signals, the very early smoke alarm and the ultraviolet (infrared) detection, is used as the criterion for stopping the flexible DC system, which can prevent both false operation and refusal to operate. The dual logic judgment integrates the configuration of fire prevention measures and equipment in the valve hall, improves the reliability and sensitivity of the tripping of the control and protection system of the flexible DC converter station, and can stop the system in a timely and effective manner, avoiding the expansion of the fire, and ensuring the safety of the IGBT in the converter station. Safe and stable operation of the valve hall. In addition, the trip signal sent by the very early smoke detection system and ultraviolet (infrared) is directly sent to the redundant DC control and protection system of the converter station without passing through the central alarm of the fire alarm system. After the fire trip signal is activated, it passes through the DC converter station. The control system executes the trip command after logical judgment and switching, which further effectively ensures that the DC system can be shut down in time when a fire occurs in the valve hall.

The advantages of the present invention are:

1. It is designed according to the two systems of the very early smoke detection system and the ultraviolet (infrared) detection system, and the simultaneous occurrence of the two types of alarm signals of the very early smoke alarm and the ultraviolet (infrared) detection is considered as the criterion for stopping the flexible DC system. Anti-misoperation and anti-operation prevention can ensure the correctness and sensitivity of the automatic fire alarm system of the converter valve valve hall on the trip outlet of the DC control and protection system platform, and ensure the safe and stable operation of the flexible converter station.

2. The logic design of tripping action fully guarantees the correct extension and action of the tripping function of the valve hall fire automatic alarm system on the converter station control and protection system platform, and also ensures that the flexible DC system can be shut down as soon as possible when a fire occurs in the valve hall.

Description of drawings

Fig. 1 is a logical schematic diagram of the tripping mode of the IGBT valve hall fire protection measures of the flexible DC converter station according to the present invention.

The present invention will be further described below in conjunction with the examples.

Detailed ways

Best practice:

Referring to accompanying drawing 1, the automatic fire alarm system involved in the tripping mode of the IGBT valve hall fire prevention measures of a flexible direct current converter station includes a logic control unit, a very early smoke detection system, an ultraviolet detection system and a smoke detection probe at the air inlet of the air conditioner. The smoke detectors of the very early smoke detection system and the ultraviolet probes of the ultraviolet detection system are covered and distributed in the valve hall;

The logic control unit includes a first logic judgment unit, a second logic judgment unit and a trip control unit. An induction sending end of the very early smoke detection system and the ultraviolet detection system is connected to the first logic judgment unit. The smoke from the air inlet of the air conditioner An inductive sending end of the detection probe is connected to the first logical judging unit through a locking unit, another inductive sending end of the ultraviolet detection system and the smoke detection probe of the air-conditioning air inlet is connected to the second logical judging unit, and the first logical judging unit The output terminals of the unit and the second logic judging unit are connected to a trip control unit, and the trip control unit is connected to a redundant DC control and protection system of the converter station.

The layout of the very early smoke detection system and ultraviolet (infrared) detection system is based on the principle that the detection range covers the entire area of the valve hall, and at least two detectors (probes) must detect smoke, arc or open flame at the same place. A smoke detection probe is installed at the air inlet of the air conditioner in the valve hall, and the function of setting the reference value of the background smoke concentration in the surrounding environment is activated to prevent the early smoke detection system from malfunctioning in the valve hall caused by the smoke generated by external straw burning. The very early smoke detection system is generally divided into 4 levels of alarms, namely warning, action, fire alarm 1 and fire alarm 2, and the highest level of alarm "fire alarm 2" is used as the trip signal.

The logic control method of automatic fire alarm system is as follows:

When any smoke detector of the very early smoke detection system senses smoke, and at the same time any ultraviolet probe of the ultraviolet detection system senses arc light or open flame, both of them send signals to the first logic judgment unit, and the first logic judgment unit receives After the two signals, the trip command is sent to the DC control and protection system through the trip control unit;

When the smoke detection probe of the air inlet of the air conditioner senses the smoke, it sends a signal to the blocking unit, and the first logic judgment unit is blocked by the blocking unit; in fact, it is the signal of the very early smoke detection system that is blocked, and the first logic judgment unit temporarily does not work . After sensing the smoke, the smoke detection probe at the air inlet of the air conditioner also sends a signal to the second logic judging unit. The signal is sent to the second logic judging unit, and the second logic judging unit sends a trip instruction to the DC control and protection system through the trip control unit after receiving the signals sent by the smoke detection probe of the air inlet of the air conditioner and the ultraviolet detection system.

The automatic fire alarm system of the valve hall according to the present invention retains the independent alarm function of the original system. When any abnormality is detected by any probe, it should be sent to the control host of the automatic fire alarm system in time, and an alarm message will be sent to notify the operator of the converter station. In addition, in the specific implementation, the interface interface between the automatic fire alarm system of the valve hall and the control and protection system is bounded by the 24V empty contact output by the smoke detection sensor and the ultraviolet probe, and the fire alarm system equipment such as the smoke detection sensor and the ultraviolet probe is controlled by the valve The hall fire automatic alarm system manufacturer is responsible, and the smoke detection sensor and ultraviolet probe 24V empty contact output to trip action output is the responsibility of the DC control and protection system manufacturer. In the control and protection of the flexible DC converter station, the soft or hard pressure plate of the trip circuit of the automatic fire alarm system of the switching valve hall is configured, so that the operation and maintenance personnel can switch on and off the fire prevention measures of the valve hall to trip the outlet circuit according to the actual operation requirements.

The trip logic design of the IGBT valve hall fire protection measures of the flexible DC converter station described in the present invention is a perfect logic design technology that extends the basic function of the valve hall fire prevention measures fire automatic alarm to the realization of tripping on the flexible DC converter station control and protection system platform. It provides a relatively mature and reliable design principle and technical scheme for the early shutdown of the flexible DC system when a fire occurs in the valve hall. The design of the automatic fire alarm system outputting the fire alarm trip contact, which is composed of two systems of the very early smoke detection system and the ultraviolet (infrared) detection system, which constitutes the fire prevention measures of the valve hall, and the control and protection system of the flexible converter station executes the design of the trip exit command after logical judgment. The technology ensures that the DC system will be shut down as soon as possible in case of a fire in the valve hall, reducing the damage to the expensive IGBT converter valve caused by the fire in the valve hall; at the same time, a soft or hard pressure plate for switching on and off the trip circuit of the automatic fire alarm system is added to the control and protection system It is convenient for the operation and maintenance personnel to switch on and off the trip function of the valve hall fire protection measures according to the actual operation requirements, and provides reliable technical guarantee for the safe and stable operation of the flexible DC converter station.

The parts not described in the present invention are the same as the prior art.

Claims (1)

1. a kind of flexible direct current converter station IGBT valves Room fire prevention measure wavy trajectory, which is characterized in that include the following steps：

Automatic fire alarm system is provided, includes pole early-stage smog detection system, ultraviolet detection system and air-conditioning air inlet Smoke detection probe, the ultraviolet probe of the smoke detector and ultraviolet detection system of the pole early-stage smog detection system Covering is distributed in the valve Room；

Automatic fire alarm system further includes having a logic control element, which includes the first logic judgment list Member, the second logic judgment unit and tripping control unit, an induction of pole early-stage smog detection system and ultraviolet detection system Transmitting terminal is all connected in the first logic judgment unit, and an induction transmitting terminal of the smoke detection probe of air-conditioning air inlet passes through one Locking unit is connected in the first logic judgment unit, the smoke detection of ultraviolet detection system and air-conditioning air inlet probe it is another One induction transmitting terminal is connected in the second logic judgment unit, the output of the first logic judgment unit and the second logic judgment unit End is connect with tripping control unit, and tripping control unit is connected in the DC control and protection system of current conversion station redundancy；

When any smoke detector of pole early-stage smog detection system senses smog, while any purple of ultraviolet detection system Outer probe senses that arc light or open fire, pole early-stage smog detection system and ultraviolet detection system transmit a signal to first and patrol Judging unit is collected, after the first logic judgment unit receives the two signal, trigger signal is sent and gives tripping control unit, by tripping control Unit processed sends trip command to DC control and protection system；

After the smoke detection probe of air-conditioning air inlet senses smog, locking unit is sent a signal to, is closed by locking unit Lock the first logic judgment unit；The smoke detection probe of air-conditioning air inlet sends a signal to the second logic judgment unit simultaneously, such as Fruit at this time in ultraviolet detection system there are two or more than two ultraviolet probes sense arc light or open fire, then ultraviolet light is visited Examining system also transmits a signal to the second logic judgment unit, and the smoke detection that the second logic judgment unit receives air-conditioning air inlet is visited After the signal that head is sent with ultraviolet detection system, trip command is sent by the control unit that trips and protects system to DC control System.