WO2015074429A1

WO2015074429A1 - Distributed spare automatic switching apparatus connection method and spare automatic switching action method thereof

Info

Publication number: WO2015074429A1
Application number: PCT/CN2014/082051
Authority: WO
Inventors: 万新强; 赖勇; 吴明希
Original assignee: 国家电网公司; 江苏省电力公司; 江苏省电力公司宿迁供电公司
Priority date: 2013-11-19
Filing date: 2014-07-11
Publication date: 2015-05-28
Also published as: CN103560579A; CN103560579B

Abstract

A distributed spare automatic switching apparatus, especially a distributed spare automatic switching apparatus used for a power grid, provides a good technical guarantee for a wide-range application of connecting a distributed power supply system to a large power grid. The following steps are comprised: 1) connecting a circuit breaker position reflecting a distributed power supply to the spare automatic switching apparatus in parallel, wherein input of the circuit breaker position is obtained from a normally closed contact of the spare automatic switching apparatus; and 2) from two pairs of normally closed contacts that can reflect real-time power generation status of the distributed power supply in each line, connecting one pair to a judging loop of the circuit breaker position in the spare automatic switching apparatus in series, and connecting the other pair of the normally closed contacts to a corresponding continuous switching trip loop in the spare automatic switching apparatus in series. Connecting distributed power supply lines to an electric power system continuously is completed intelligently, in real time, accurately and without manual intervention. This can not only save operation costs for an electric power enterprise, but also reduce risks to secure and stable running of a power grid.

Description

Distributed standby self-injection device connection method and self-propelled action method

Technical field

The distributed standby self-injecting device connecting method and the self-injecting action method thereof relate to a distributed standby self-injecting device, in particular to a distributed standby self-injecting device for a power grid, and the distributed power supply system has a large access A wide range of applications for the power grid provide good technical support. Background technique

Distributed power generation refers to a power generation system or multiple supply system that is built near the user and that produces electricity in addition to its own use, and the excess power is sent to the local distribution network. Its main features are: small power supply capacity, low voltage level; close to the load center, access to the distribution network; flexible operation mode, can be networked or not connected; power safety is more reliable than centralized power generation, and the probability of power outage is small. Distributed energy generation is the energy development method that best reflects the 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 issued continuous guidance on the distribution of power supplies such as wind power and natural gas to the power system. With the development of photovoltaic power generation in China, higher requirements are put forward for the safe and stable operation of the power grid. The automatic power supply or standby equipment automatic input device (referred to as "preparation self-injection device") is an important secondary device that is indispensable for ensuring the safe and stable operation of the power system. In the event of a grid failure, whether or not the small power source is connected to the grid, the self-injecting device will immediately remove the small power system and quickly isolate it from the grid. If the distributed power supply is simply handled as a small power source, it is not correctly resolved whether the distributed power source is generating electricity on the Internet or as an ordinary user, and immediately isolates it from the power grid. The superiority of the security and flexibility of distributed power systems is impossible to talk about. With the continuous access of the distributed power supply to the power system, in the original backup and self-injection wiring mode, each time a distributed power supply is connected, the original self-injection device must be logically modified. The program is upgraded, and the corresponding on-site secondary wiring is changed, and the necessary power outage and acceptance work are required. This not only causes unnecessary power outages to the users, but also reduces the economic benefits of the power companies. In the related inspection and acceptance work, it is also very likely to cause serious accidents such as large-scale power outages in the power grid.

The original distributed power supply self-injection device needs the dispatching department to set the running status of the distributed power line in advance, and the operating personnel change the device pressure plate and the reset value at the substation site. After the self-injection device is activated, not only the small power supply line connected to the grid is cut off, but also the feed line that is normally operated is miscut. This not only increases the working intensity of the operating operators, but also greatly increases the probability of accidents caused by mis-delivery of the pressure plate and the setting error.

Summary of the invention

The object of the present invention is to provide a distributed standby self-injection device connection method and a self-propelled action method thereof for the above-mentioned deficiencies, and by changing the wiring principle of determining the position of the relevant circuit breaker in the original standby device, The position of the distributed power supply circuit breaker corresponding to the actual operation state of the distributed power supply is entered into the position determination and trip outlet circuit of the corresponding distributed power circuit breaker, so that even if the distributed power supply system is continuously connected to the original standby power supply device, The original self-injection device is logically modified and the corresponding wiring changes are made.

A distributed standby self-injection device connection method and a self-describing operation method are implemented by the following technical solutions:

A distributed standby device connection method includes the following steps:

1) Parallelly connecting the position of the reaction distributed power circuit breaker to the self-injecting device, wherein the position of the circuit breaker is opened to the normally closed contact point of the self-injecting device;

2) Two pairs of normally closed connections in each line that reflect the real-time power generation status of the distributed power supply Point, wherein a pair of serially connected to the circuit breaker position determining circuit in the standby device, and another pair of normally closed contacts are serially connected into the corresponding tangent trip circuit in the standby device.

After a distributed standby self-injection device connection method, the corresponding self-propelled action method is:

1) The busbar switch is self-describing

In normal operation, the busbar 3DL switch is hot standby, the 1DL switch and the 2DL switch are in the same position, and the I and II busbars are respectively operated;

In case of failure, the II section busbar loses power, 35kV is ready for self-injection action, jumps 2DL switch, and simultaneously jumps the distributed power line C and D switch. At this time, if (the D line is the switch of the power generation line, it will jump at the same time; If the switches in the C and D lines are feeders, they will not trip. After waiting for the self-propelled device to operate and the 3DL switch, the power supply will be restored in the shortest time.

The I-segment bus is de-energized, 35kV is self-propelled, and the 1DL switch is jumped. At the same time, the distributed power lines A and B are connected. At this time, if the switch in the B line is the power line, it will jump at the same time; if A, B The switch that is the feed line in the line will not trip, and wait for the self-propelled device to operate and the 3DL switch, and then restore the power supply in the shortest time.

2) Main change switch preparation method

In normal operation, the 2DL switch is hot standby, the busbar 3DL switch is operated, and the 1DL switch is operated with I and II busbars. When a fault occurs, the I and II sections of the bus are de-energized, 35kV is ready for self-injection, and the 1DL switch is jumped. At the same time, the distributed power line, B, C, and D switches are connected. At this time, if the switches of the A, B, C, and D lines are power generation lines, they will jump at the same time. At this time, if the switches of the feeder lines in the A, B, C, and D lines will not trip, wait for the standby device to operate and the 2DL switch, and then restore the power supply in the shortest time. In normal operation, the 1DL switch is hot standby, the busbar 3DL switch is operated, and the 2DL switch is operated with I and II segment busbars. At this time, the fault causes the I and II busbars to lose power, and the 35kV is ready for self-propelled action. 2DL switch, at the same time, the distributed power line, B, C, D switch simultaneously jumps the distributed power line A, B, C, D switch. At this time, if the switches of the A, B, C, and D lines are power generation lines, they will jump at the same time. At this time, if the switches of the feeder lines in the A, B, C, and D lines are not tripped, the power supply is restored in the shortest time after waiting for the self-propelled device to operate with the 1DL switch.

The connection method of the invention takes current and voltage from the relevant current transformer and voltage transformer, and uses the product of voltage and current to determine the current flow direction (phase), determines the real-time operating state of the distributed power line, and connects the corresponding auxiliary contacts. Into the distributed power supply and self-injection circuit, it plays the role of the pressure plate in the original circuit, and it is no longer necessary for the operating personnel to change the operation mode of the distributed power supply, and the press plate retracting work must be performed frequently. Through the intelligent judgment of the distributed power supply operation mode, the operation mode and action logic of the standby power supply can be automatically adapted, and the safety and flexibility of the distributed power supply system can be maximized. However, only a slight modification of the wiring mode of the self-injection device is required, so that only the distributed power supply line can be cut off after the self-injection operation, and the feed line is not cut off, and the power failure range is no longer expanded.

The method for connecting distributed standby self-injection devices is to connect all the circuit breaker positions of all distributed power sources into the self-injection device in parallel, and the position of the circuit breaker position of the original access device is automatically opened. The point is changed to a normally closed contact. When the distributed power line is continuously connected to the power system, the original self-injection device will not need to be logically modified or upgraded, and the corresponding on-site secondary wiring will not need to be changed to reduce unnecessary power outage and acceptance; The contact point reflecting the real-time power generation state of the distributed power source is introduced into the judgment loop of the action logic of the self-injection. The dispatching department originally needs to arrange the operation mode of the substation where the distributed power source exists in advance, and the operation personnel change the device to the substation site. The relevant work of the pressure plate and the resetting value will be all from the self-injecting device according to the distributed operation mode in the power grid, real-time, accurate Indeed, 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. DRAWINGS

The present invention will be further described below with reference to the accompanying drawings:

1 is a schematic diagram of a main wiring of a conventional self-injection device operation logic; FIG. 2 is a conventional wiring diagram of a self-operated circuit breaker (the internal wiring in a virtual frame is an external connection);

3 is an external wiring diagram of a conventional standby circuit breaker position in the broken line frame of FIG. 2; FIG. 4 is a schematic diagram of a position wiring mode of the standby self-operating circuit breaker of the present invention;

FIG. 5 is a schematic diagram of the wiring manner of the distributed power supply standby switch outlet of the present invention. detailed description

Referring to Figure 1, the traditional self-injection action logic is:

1) When the bus-coupled switch is in normal operation, the busbar 3DL switch is hot standby, and the 1DL switch and 2DL switch are in operation for the I and II busbars. When the fault occurs, the II busbar loses power and the 35kV is self-propelled. , 2DL switch is jumped, and the distributed power line C and D switches are connected at the same time. The above switch has been tripped, and then the 3DL switch is connected; the I-segment bus is de-energized, 35kV is ready for self-projection, and the 1DL switch is jumped. Distributed power line, B switch, the above switch has indeed tripped, and then the 3DL switch. 2) When the main transformer switch is in normal operation mode, the 2DL switch is hot standby, the busbar 3DL switch is running, and the 1DL switch is operated with I and II busbars. When a fault occurs, the I and II busbars are de-energized, and 35kV is self-contained. Cast action, jump 1DL switch, and simultaneously jump distributed power line, B, C, D switch; At this time, if the A, B, C, D line is the switch of the power generation line, it will jump at the same time; if A, B, The switches in the C and D lines that are feeding lines will not trip, waiting for the self-injection device to operate. After the 2DL switch is combined, the power supply is restored in the shortest time; in normal operation, the 1DL switch is hot standby, the busbar 3DL switch is running, and the 2DL switch is equipped with I.

Section II bus operation; When a fault occurs, the I and II busbars are de-energized, 35kV is ready for self-propelled action, and the 2DL switch is jumped. At the same time, the distributed power line, B, C:, D switch are simultaneously connected to the distributed power line. A, B, C, D switch; At this time, if the switch of the B, C, D line is the power generation line, it will jump at the same time; if the A, B, C, D line is the switch of the feed line, it will not It will jump off and wait for the self-propelled device to operate in conjunction with the 1DL switch to resume power supply in the shortest time.

It can be seen from the above process 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 supply device can operate correctly. When fewer distributed power lines are connected to the system, the technical conditions can be met by increasing the amount of opening of the circuit breaker position. With the continuous access of the distributed power supply, if the self-injecting device still uses the original wiring method, it will be far from meeting the relevant requirements. Referring to Figures 2 to 3, by observing the connection mode of the circuit breaker by changing the position of the circuit breaker, the corresponding protection logic is changed, and the self-injection device does not need to increase the amount of opening without limitation, and only requires one opening amount. The acquisition enables multiple (in theory, unlimited access) access to distributed power lines and the corresponding interlocking function.

When the distributed power line is used as the feeder line, we only need to open the corresponding circuit breaker position plate and the self-injection cut-out port through the platen. The self-injecting device will not trip the distributed power supply line that has been retracted by the pressure plate, and will lock the device to be self-injected to prevent accidents caused by the action of the main variable gap protection and the safety and stability control device.

If we take current and voltage from the relevant current transformer and voltage transformer, use the product of voltage and current to determine the current flow direction (phase), identify the real-time operating state of the distributed power line, and connect the corresponding auxiliary contacts to the distribution. Power supply In the middle, the function of the pressure plate in the original circuit is no longer required, and the operation personnel are no longer required to change the operation mode of the distributed power supply, and the press plate retracting work must be performed frequently. Through the intelligent judgment of the distributed power operation mode, the operation mode and action logic of the self-injection are automatically adapted. In order to maximize the safety and flexibility of the distributed power system, as long as the wiring method of the self-injection device is slightly modified, only the distributed power supply line can be cut off after the self-propelled operation, without mistakenly cutting off the feed. For the line, it will no longer cause the power outage to expand.

Referring to Figures 4 to 5, a method for connecting a distributed standby device includes the following steps:

2) Two pairs of normally closed contacts that can reflect the real-time power generation status of the distributed power supply in each line, wherein a pair of serial connection devices are connected to the circuit breaker position determination circuit in the self-injection device, and another pair of normally closed contacts are connected in series. The corresponding tandem trip circuit in the self-injection device.

After adopting the distributed standby self-injection device connection method shown in FIGS. 4 to 5, the corresponding self-injection action logic is:

1) The busbar switch is self-describing

In the event of a fault, the II section bus is de-energized, 35kV is ready for self-injection, and the 2DL switch is jumped. At the same time, the distributed power line C and D switches are connected. At this time, if the C and D lines are the switches of the power generation line, they will be tripped at the same time. . At this time, if the C and D lines are the switches of the feeding line, they will not trip, and after waiting for the self-injecting device to operate and the 3DL switch, the power supply will be restored in the shortest time.

The I-segment bus is de-energized, 35kV is self-propelled, and the 1DL switch is jumped. At the same time, the distributed power lines A and B are connected. At this time, if the A and B lines are the switches of the power generation line, they will be the same. Jump off. At this time, if the switches of the feeder lines in the A and B lines are not tripped, the power supply will be restored in the shortest time after waiting for the self-propelled device to operate and the 3DL switch.

2) Main change switch preparation method

In normal operation, the 2DL switch is hot standby, the busbar 3DL switch is running, and the 1DL switch is running with I and II busbars. When a fault occurs, the I and II busbars are de-energized, 35kV is ready for self-projection, and the 1DL switch is jumped. Jump the distributed power line, B, C, D switch; at this time, if the A, B, C, D lines are the switches of the power generation line, they will jump at the same time; if the A, B, C, D lines are the feed lines The switch will not trip, wait for the standby device to operate and the 2DL switch, and restore the power supply in the shortest time; In normal operation, 1DL switch hot standby, bus couple 3DL switch operation, 2DL switch with I, II segment bus Operation; When a fault occurs, the I and II busbars are de-energized, 35kV is ready for self-projection, and the 2DL switch is jumped. At the same time, the distributed power cable, B, C, and D switches are simultaneously connected to the distributed power cables A and B. C, D switch; At this time, if the switch of the power generation line in the eight, B, C, and D lines will be tripped at the same time; if the switch of the feeder line in the A, B, C, and D lines will not trip Waiting for the self-injection device action After 1DL switch to restore power in the shortest time.

Claims

claims

1. A method for connecting distributed backup and automatic switching devices, which is characterized in that it includes the following steps:

1) Connect the circuit breaker position of the reaction distributed power supply in parallel to the automatic switching device, and the circuit breaker position is connected to the normally closed contact of the automatic 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 is connected in series to the circuit breaker position judgment loop of the line in the standby automatic switching device, and the other pair of normally closed contacts is connected in series to the standby automatic switching device. In the corresponding continuous tripping circuit of the automatic switching device.

2. The distributed backup and automatic switching device connection method according to claim 1, characterized in that the corresponding backup and automatic switching action method is:

1) Bus tie switch equipment automatic switching action method

During normal operation, the 3DL switch of the bus link is in hot standby, and the 1DL switch and 2DL switch are in the closed position and operate the I and II busbars respectively;

When a fault occurs, the busbar in Section II loses power, the 35kV standby is automatically transferred, the 2DL switch is tripped, and the C and D switches of the distributed power line are simultaneously tripped. At this time, if the switches of the ( and D lines are power generation lines, they will be tripped at the same time; If the switches in the C and D lines are feed line switches, they will not trip, and the power supply will be restored in the shortest possible time after the standby automatic switching device operates and closes the bus coupler 3DL switch;

Section I bus loses power, 35kV is ready for self-transfer, the 1DL switch is tripped, and the switches A and B of the distributed power line are simultaneously tripped. At this time, if the switches of line B and line B are the switches of the power generation line, they will be tripped at the same time; if A, B The switch in the line that is the feed line will not trip, and the power supply will be restored in the shortest time after the backup automatic switching device operates and closes the bus coupler 3DL switch;

2) Main transformer switch automatic switching action method

During normal operation, the 2DL switch is in hot standby, the bus coupler 3DL switch is in operation, and the 1DL switch is in operation with the busbars in sections I and II; when a fault occurs, the busbars in sections I and II are de-energized, and the 35kV standby switches automatically. action, jump the 1DL switch, and simultaneously jump the distributed power line, B, C, and D switches; at this time, if the switches in the A, B, C, and D lines are power generation line switches, they will be tripped at the same time; if A, B, and C . The switch in the D line, which is the feed line, will not trip. It will resume power supply in the shortest time after the standby automatic switching device operates and closes the 2DL switch. During normal operation, the 1DL switch is in hot standby and the bus coupler 3DL switch is running. The 2DL switch operates with busbars in sections I and II; when a fault occurs, the busbars in sections I and II are de-energized, 35kV is prepared for self-transfer action, the 2DL switch is tripped, and the distributed power lines are tripped simultaneously, and switches B, C, and D are tripped simultaneously. Distributed power line A, B, C, D switches; At this time, if the switches in lines A, B, C, and D are power generation lines, they will trip at the same time; If lines A, B, C, and D are feed lines The switch will not trip, and the power supply will be restored in the shortest time after the backup automatic switching device closes the 1DL switch.