CN103560579A - Distributed backup automatic switch device connecting method and backup automatic switch action method of distributed backup automatic switch device - Google Patents

Abstract

The connection method of the distributed standby automatic switching device and the standby automatic switching operation method of the present invention relate to a distributed standby automatic switching device, especially a distributed standby automatic switching device used for power grids, which is used for large access to distributed power supply systems. The large-scale application of the power grid provides a good technical guarantee. It includes the following steps: 1) Connect the position of the circuit breaker of the reactive distributed power supply in parallel to the backup self-switching device, wherein the position of the circuit breaker is connected to the normally closed contact of the self-prepared self-switching device; 2) Connect each line that can reflect the distributed Two pairs of normally closed contacts in the real-time power generation state of the power supply, one pair of which is connected in series to the line circuit breaker position judgment circuit in the standby automatic switching device, and the other pair of normally closed contacts is connected in series to the corresponding continuous cut tripping circuit in the standby automatic switching device . When the distributed power lines are continuously connected to the power system, real-time, accurate, and intelligent completion without manual intervention. This will not only save the operating costs of power companies, but also reduce the risk of safe and stable operation of the power grid.

Description

Connection method of distributed standby automatic switching device and its action method

technical field

The connection method of the distributed standby automatic switching device and the standby automatic switching operation method of the present invention relate to a distributed standby automatic switching device, in particular, a distributed standby automatic switching device used in a power grid, which is connected to a large distributed power supply system. The large-scale application of the power grid provides a good technical guarantee.

Background technique

Distributed power generation refers to a power generation system or a multi-generation system that is built near the user, and the excess power is sent to the local distribution network in addition to self-use. Its main features are: small power supply capacity, low voltage level; close to the load center, connected to the distribution network; flexible operation mode, can be connected to the Internet or not; the safety of electricity consumption is more reliable than centralized power generation, and the probability of power failure is smaller.

Distributed energy generation is an energy development method that best embodies the multiple advantages of energy saving, emission reduction, safety, and flexibility. The national "Twelfth Five-Year Plan" outline clearly proposes to promote the promotion and application of distributed energy systems. In 2011, the National Energy Administration successively issued guidelines for connecting distributed power sources such as wind power and natural gas to the power system. With the development of photovoltaic power generation in my country, higher requirements are put forward for the safe and stable operation of the power grid. Backup power supply or backup equipment automatic input device (referred to as "standby automatic input device") is an important secondary equipment that is indispensable to ensure the safe and stable operation of the power system. When the power grid fails, no matter whether the small power supply is connected to the grid or not, the backup self-switching device will immediately cut off the small power supply system and quickly isolate it from the grid. If the distributed power supply is simply treated as a small power supply, and it is not possible to correctly distinguish whether the distributed power supply is generating electricity on the grid or using electricity as an ordinary user, it will be immediately and quickly isolated from the grid. The safety and flexibility of the distributed power system are out of the question.

With the continuous access of distributed power sources to the power system, under the original backup and automatic switching wiring mode, every time a distributed power source is connected, the original backup and automatic switching devices must be logically modified, program upgraded, and the corresponding On-site secondary wiring transformation, and necessary power outage and acceptance work. This will not only cause unnecessary power outages for users, reduce the economic benefits of power companies, but also easily cause serious accidents such as large-scale power outages in the power grid during related acceptance work.

The original distributed power backup self-switching device requires the dispatching department to set the operating status of the distributed power line in advance, and the operating personnel go to the substation to change the device's pressure plate and switch on and off the setting value. After the standby self-injection device operates, it not only cuts off the grid-connected small power supply line, but also accidentally cuts it as a feeder line for normal operation. This will not only increase the work intensity of the operating personnel, but also greatly increase the probability of accidents caused by mistakenly throwing and returning the pressure plate and setting the value incorrectly.

Contents of the invention

The object of the present invention is to provide a kind of connection method of distributed standby automatic switchover device and its standby automatic switchover action method in view of the above-mentioned deficiencies, by changing the wiring principle of judging the position of the relevant circuit breaker in the original standby automatic switchover device, it will be able to The contacts that reflect the actual operating status of the distributed power supply are serially connected to the position judgment and tripping exit circuit of the corresponding distributed power circuit breaker of the standby automatic switching device, so that even if the distributed power supply system is continuously connected to the original standby automatic switching device, there is no need to Carry out logic modification and make corresponding wiring changes to the original standby automatic switching device.

A method for connecting a distributed standby automatic switch device and its standby automatic switch operation method are realized by adopting the following technical solutions:

A method for connecting a distributed standby automatic switching device, comprising the following steps:

1) Connect the position of the circuit breaker of the reactive distributed power supply in parallel to the backup self-switching device, where the position of the circuit breaker is connected to the normally closed contact of the self-prepared self-switching device;

2) Connect two pairs of normally closed contacts in each line that can reflect the real-time power generation status of the distributed power supply, one pair of which is connected in series to the circuit breaker position judgment circuit of the standby automatic switching device, and the other pair of normally closed contacts is connected in series to the standby In the corresponding continuous cut tripping circuit in the automatic switching device.

After a connection method of a distributed standby automatic switching device, its corresponding standby automatic switching action method is:

1) Action method of bus tie switch standby automatic switching

During normal operation, the 3DL switch of the bus coupler is hot standby, and the 1DL switch and the 2DL switch are in the close position to run the I and II sections of the bus respectively;

In the event of a fault, the busbar in section II loses power, the 35kV standby self-transmitter operates, the 2DL switch is tripped, and the C and D switches of the distributed power lines are jointly tripped. If the switches of the C and D lines are feeder lines, they will not jump off, and the power supply will be restored in the shortest time after the standby self-injection device acts to close the bus tie 3DL switch.

Section I busbar loses power, 35kV standby self-injection action, jumps 1DL switch, and simultaneously jumps the distributed power line A, B switch, at this time, if A, B line is the switch of the power generation line, it will be switched off at the same time; if A, B The switch in line B, which is the feeder line, will not be tripped, and the power supply will be restored in the shortest time after the standby self-injection device acts to close the 3DL switch of the bus tie.

2) Action method of main transformer switch and standby automatic switching

During normal operation, the 2DL switch is hot standby, the bus coupler 3DL switch is running, and the 1DL switch is running with I and II busbars. When a fault occurs, the I and II busbars will be de-energized, the 35kV standby automatic switch will operate, the 1DL switch will be tripped, and the A, B, C, and D switches of the distributed power lines will be tripped simultaneously. And this moment if be the switch of generating circuit in A, B, C, D circuit, will jump off simultaneously. At this time, if the switches of A, B, C, and D lines are feeder lines, they will not jump off, and the power supply will be restored in the shortest time after the standby self-injection device acts to close the 2DL switch.

During normal operation, the 1DL switch is hot standby, the bus coupler 3DL switch operates, and the 2DL switch operates with I and II busbars. At this time, the fault causes the busbars of sections I and II to lose power, the 35kV standby self-injection action, jump the 2DL switch, and simultaneously jump the distributed power line A, B, C, D switch and simultaneously jump the distributed power line A, B, C, D switch. And this moment if be the switch of generating circuit in A, B, C, D circuit, will jump off simultaneously. At this time, if the switches of the A, B, C, and D lines are feeder lines, they will not jump off, and the power supply will be restored in the shortest time after the standby self-injection device acts to close the 1DL switch.

The connection method of the present invention obtains current and voltage from related current transformers and voltage transformers, uses the product of voltage and current to determine the current flow direction (phase), determines the real-time operating status of the distributed power supply line, and connects the corresponding auxiliary contacts Into the distributed power backup self-injection circuit, it plays the role of the pressure plate in the original circuit, and it is no longer necessary for the operator to frequently perform the pressure plate switching and withdrawal work due to the change of the distributed power supply operation mode. After the intelligent judgment on the operation mode of the distributed power supply, the operation mode and action logic of the standby automatic switch can be automatically adapted, which will maximize the safety and flexibility of the distributed power supply system. It only needs to slightly modify the wiring mode of the standby automatic switching device to realize that only the distributed power line is cut off after the standby automatic switching operation, and the feeder line is not accidentally cut off, which will no longer cause the expansion of the power outage range.

A method for connecting distributed standby automatic switching devices of the present invention is to connect all the circuit breakers of distributed power sources in parallel to the standby automatic switching devices, and change the position contacts of the original circuit breakers connected to the standby automatic switching devices from normally open contacts The point is changed to a normally closed contact. When the distributed power lines are continuously connected to the power system, there is no need to modify the logic and program upgrades of the original standby automatic switching device, and it is not necessary to change the corresponding on-site secondary wiring, reducing unnecessary power outages and acceptance work; Introduce the contact point reflecting the real-time power generation status of distributed power into the judgment loop of the action logic of standby and automatic switching. Originally, the dispatching department had to arrange the operation mode of the substation with distributed power in advance, and the operating personnel went to the substation to change the device on site. The work related to the pressure plate and the value of switching on and off will all be completed intelligently by the standby automatic switching device in real time, accurately and without manual intervention according to the distributed operation mode in the power grid. This will not only save the operating costs of power companies, but also reduce the risk of safe and stable operation of the power grid.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing:

Figure 1 is a schematic diagram of the main wiring of the action logic of the traditional standby automatic switching device;

Figure 2 is the wiring diagram of the position of the conventional backup self-switching circuit breaker (the wiring inside the virtual frame is the external wiring);

Fig. 3 is an external wiring diagram of the position of the conventional backup self-switching circuit breaker within the dotted line box in Fig. 2;

Fig. 4 is a schematic diagram of the position wiring mode of the standby self-switching circuit breaker of the present invention;

Fig. 5 is a schematic diagram of the wiring mode of the self-injection and tripping outlet of the distributed power supply of the present invention.

Detailed ways

Referring to Figure 1, the traditional standby auto-initialization action logic is:

1) Bus tie switch standby automatic switching mode

During normal operation, the 3DL switch of the bus coupler is hot standby, and the 1DL switch and the 2DL switch are in the close position to run the I and II sections of the bus respectively;

In the event of a fault, the bus section II loses power, the 35kV standby self-injection action, jumps the 2DL switch, and at the same time jumps the C and D switches of the distributed power line, the above switch has indeed tripped, and then closes the bus connection 3DL switch; , 35kV standby self-injection action, jump the 1DL switch, and at the same time jump the distributed power line A, B switch, the above switch has indeed been tripped, and then close the bus connection 3DL switch.

2) The main transformer switch standby automatic switching mode

During normal operation, the 2DL switch is in hot standby mode, the bus-connected 3DL switch operates, and the 1DL switch runs with the busbars of sections I and II; Jump the switches of distributed power lines A, B, C, and D; at this time, if the switches of A, B, C, and D lines are power generation lines, they will be switched off at the same time; if the switches of A, B, C, and D lines are feeder The switch of the line will not be tripped, and the power supply will be restored in the shortest time after the standby self-injection device operates to close the 2DL switch;

During normal operation, the 1DL switch is hot standby, the bus-connected 3DL switch is running, and the 2DL switch is running with the I and II busbars; Jump the switches of distributed power lines A, B, C, and D and simultaneously jump the switches of distributed power lines A, B, C, and D; Open; if the switches of A, B, C, D lines are feeder lines, they will not jump off, wait for the standby self-injection device to close the 1DL switch, and then restore the power supply in the shortest time.

Through the above process, it can be seen that the correct judgment of the position of the circuit breaker of the corresponding circuit breaker plays a decisive role in whether the distributed power backup automatic switching device can operate correctly. When fewer distributed power lines are connected to the system, the technical conditions can be met by increasing the input quantity judged by the position of the circuit breaker. With the continuous access of distributed power sources, if the standby automatic switching device still uses the original wiring method, it will be far from meeting the relevant requirements.

Referring to the accompanying drawings 2-3, by observing the connection mode of connecting the standby automatic switch by changing the position of the circuit breaker and changing the corresponding protection logic, the standby automatic switch does not need to increase the binary input without limit, and only needs one binary input. The acquisition can realize the access of multiple (theoretically unlimited access) distributed power lines, and realize the corresponding connection and switching functions.

When the distributed power line is used as the feed line, we need to switch on and off through the pressure plate and only need to open the corresponding circuit breaker position pressure plate and the outlet of the automatic switching and cutting. The standby automatic switching device will no longer block the standby automatic switching device due to the fact that the distributed power line that the pressure plate has switched and retreated has not been tripped, so as to prevent the expansion of accidents caused by the actions of the main transformer gap protection and safety and stability control devices.

If we obtain the current and voltage from the relevant current transformers and voltage transformers, use the product of voltage and current to determine the current flow direction (phase), determine the real-time operating status of the distributed power supply line, and connect the corresponding auxiliary contacts to the distribution In the backup self-injection circuit of the type power supply, it plays the role of the pressure plate in the original circuit, and it is no longer necessary for the operator to frequently perform the work of switching on and off the pressure plate due to the change of the operation mode of the distributed power supply. Through the intelligent judgment of the distributed power supply operation mode, the operation mode and action logic of the backup self-injection are automatically adapted. In order to maximize the safety and flexibility of the distributed power system, as long as the wiring mode of the standby automatic switching device is slightly changed, only the distributed power supply line can be cut off after the standby automatic switching operation, and the feeder can not be disconnected by mistake. The power supply line will no longer cause the scope of power outage to expand.

Referring to accompanying drawings 4 to 5, a method for connecting a distributed standby automatic switching device includes the following steps:

1) Connect the position of the circuit breaker of the reactive distributed power supply in parallel to the backup self-switching device, where the position of the circuit breaker is connected to the normally closed contact of the self-prepared self-switching device;

2) Connect two pairs of normally closed contacts in each line that can reflect the real-time power generation status of the distributed power supply, one pair of which is connected in series to the circuit breaker position judgment circuit of the standby automatic switching device, and the other pair of normally closed contacts is connected in series to the standby In the corresponding continuous cut tripping circuit in the automatic switching device.

After adopting the connection method of the distributed standby automatic switching device shown in Figures 4-5, the corresponding standby automatic switch operation logic is:

1) Action method of bus tie switch standby automatic switching

During normal operation, the 3DL switch of the bus coupler is hot standby, and the 1DL switch and the 2DL switch are in the close position to run the I and II sections of the bus respectively;

In the event of a failure, the busbar of section II loses power, the 35kV standby self-injection action, jumps the 2DL switch, and simultaneously jumps the C and D switches of the distributed power line. . At this time, if the switches of the C and D lines are feeder lines, they will not jump off, and the power supply will be restored in the shortest time after the standby self-injection device acts to close the bus tie 3DL switch.

Section I busbar loses power, 35kV standby automatic switching action, 1DL switch is tripped, and distributed power line A and B switches are tripped at the same time. And this moment, if be the switch of generating circuit in A, B circuit, will jump off simultaneously. At this time, if the switches of the A and B lines are feeder lines, they will not jump off, and the power supply will be restored in the shortest time after the standby self-injection device acts to close the bus tie 3DL switch.

2) Action method of main transformer switch and standby automatic switching

During normal operation, the 2DL switch is in hot standby mode, the bus-connected 3DL switch operates, and the 1DL switch runs with the busbars of sections I and II; Jump the switches of distributed power lines A, B, C, and D; at this time, if the switches of A, B, C, and D lines are power generation lines, they will be switched off at the same time; if the switches of A, B, C, and D lines are feeder The switch of the line will not be tripped, and the power supply will be restored in the shortest time after the standby self-injection device operates to close the 2DL switch;

During normal operation, the 1DL switch is hot standby, the bus-connected 3DL switch is running, and the 2DL switch is running with the I and II busbars; Jump the switches of distributed power lines A, B, C, and D and simultaneously jump the switches of distributed power lines A, B, C, and D; Open; if the switches of A, B, C, D lines are feeder lines, they will not jump off, wait for the standby self-injection device to close the 1DL switch, and then restore the power supply in the shortest time.

Claims (2)

1. the method for attachment of Distributed Reserve Power Source Automatic Switching device, is characterized in that, comprises the steps:

1) by reaction profile formula power circuit breaker position access in parallel backup auto-activating device, wherein circuit breaker position is opened into the normally closed contact of taking from backup auto-activating device;

2) two pairs of normally closed contacts of the real-time generating state of distributed power source will can be reflected in each circuit, this line-breaker position judgment loop in pair of series access backup auto-activating device wherein, a pair of normally closed contact seals in company corresponding in backup auto-activating device and cuts in trip(ping) circuit in addition.

2. Distributed Reserve Power Source Automatic Switching device claimed in claim 1 method of attachment, is characterized in that, its corresponding prepared auto restart method of operating is:

1) bus connection switch prepared auto restart method of operating

During normal operation, mother 3DL switch stand-by heat, 1DL switch, 2DL switch are at each self-operating of co-bit I, II section bus;

During fault, II section bus dead electricity, 35kV prepared auto restart action, jumps 2DL switch, and connection is jumped distributed power source line C, D switch simultaneously, if in C, D circuit be now the switch of generating circuit, tripping simultaneously; If in C, D circuit for feedback is for the switch of circuit, will be not can tripping, wait for that backup auto-activating device action closes after mother 3DL switch, within the shortest time, restore electricity;

I section bus dead electricity, 35kV prepared auto restart action, jumps 1DL switch, and connection is jumped distributed power source line A, B switch simultaneously, if in A, B circuit be now the switch of generating circuit, tripping simultaneously; If in A, B circuit for feedback is for the switch of circuit, will be not can tripping, wait for that backup auto-activating device action closes after mother 3DL switch, within the shortest time, restore electricity;

2) main transformer switch prepared auto restart method of operating

During normal operation, 2DL switch stand-by heat, the operation of mother 3DL switch, 1DL switch band I, the operation of II section bus; While breaking down, make I, II section bus dead electricity, the action of 35kV prepared auto restart, jumps 1DL switch, and connection is jumped distributed power source line A, B, C, D switch simultaneously; If in A, B, C, D circuit be now the switch of generating circuit, tripping simultaneously; If in A, B, C, D circuit for feedback is for the switch of circuit, will be not can tripping, wait for that backup auto-activating device action closes after 2DL switch, within the shortest time, restore electricity;

During normal operation, 1DL switch stand-by heat, the operation of mother 3DL switch, 2DL switch band I, the operation of II section bus; While breaking down, make I, II section bus dead electricity, the action of 35kV prepared auto restart, jumps 2DL switch, and the distributed power source of connection jumping simultaneously line A, B, C, D switch join simultaneously jumps distributed power source line A, B, C, D switch; If in A, B, C, D circuit be now the switch of generating circuit, tripping simultaneously; If in A, B, C, D circuit for feedback is for the switch of circuit, will be not can tripping, wait for that backup auto-activating device action closes after 1DL switch, within the shortest time, restore electricity.

Images