CN104467163B - The segmentation prepared auto restart implementation method of more electric power incoming lines - Google Patents

Abstract

The invention discloses a method for realizing multi-segment standby automatic switching of incoming lines of power supply. The n incoming lines refer to the situation that all of the n incoming lines may be used as incoming lines of power supply, and the incoming lines that only serve as loads are not connected. Standby self-injection, not counting n incoming lines, automatically adjusts the charging, discharging and export logic according to the operation mode of the primary equipment, especially when the incoming line changes from a power supply line to a load line or from a load line to a power supply line. The corresponding backup auto-switching logic improves the reliability of the backup auto-switching action and avoids the fixed operation mode of the existing backup auto-switching technology when it is connected, so that the backup auto-switching cannot operate in certain operating modes and cause large-scale power outages Case.

Description

Realization Method of Segmented Backup and Auto-switching of Multiple Power Incoming Lines

technical field

The present invention relates to a method for realizing self-switching, in particular to a method for realizing self-switching in subsections with multiple power supply incoming lines.

Background technique

The number of substations of county-level power supply companies is relatively small, and users in a large area are often powered by a 110kV substation. If the 110kV bus of the substation fails, it will cause a large-scale power outage. In order to ensure the reliability of power supply, some 110kV substations are connected with two or more 110kV power supply lines on a section of the bus, as shown in Figure 1. At the same time, in order to prevent the loss of voltage of the bus, a secondary self-switching protection device is also installed. This has resulted in the backup and self-switching mode under the connection mode of multiple power supply incoming lines. For example, the 110kV side of the 110kV Beicuo substation of Pingtan County Power Supply Company has two busbars and three 110kV power supply incoming lines, as shown in Figure 2, and is set 110kV section backup self-transfer function. The Majiang Substation of Fuzhou Power Supply Company and the 110kV Bishan Substation of Ningde Power Supply Company are also connected in this way. This creates two problems:

1) The conventional standby self-injection device can only be connected to the current and outlet circuits of the two power supply incoming lines 1 and 2 as shown in Figure 3. When the primary wiring is as shown in Figure 2, only when incoming line 1 and incoming line 2 are running at the same time, the standby automatic switch can work, but when the incoming line 2 is overhauled, and when incoming line 1 and incoming line 3 are running, the standby automatic switch cannot operate , reducing the reliability of power supply.

2) According to the adjustment of the scheduling operation mode, the 110kV incoming line may have a power supply on the opposite side of the incoming line as a power incoming line for a certain period of time, and the opposite side of the incoming line may only be used as a load end for a certain period of time, and it may be used as a power supply for a certain period of time. When the line is used, the incoming line needs to be cut off when the corresponding busbar loses voltage and the self-switching operation is performed. When it is used as a load end, it is required to keep the incoming line switch in the closed state to facilitate the restoration of power supply. However, when the existing standby automatic switch is connected, whether the incoming line is the power supply end or the load end has been determined, and it cannot be adjusted according to the operation mode.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a different operation mode that can automatically adapt to the power supply line, automatically adjust the logic of the backup and automatic switching, improve the function of the backup and automatic switching, and improve the reliability of the power supply. At the same time, when the incoming line needs to change from power supply to pure load or from pure load to power supply due to dispatching requirements, it can automatically switch the action logic of multi-power supply incoming lines through the control word.

A method for realizing multi-segment standby automatic switchover of multiple power supply incoming lines. n incoming lines refer to the situation that n incoming lines may be used as power supply incoming lines. Not counting n incoming lines,

(1), collect the secondary voltage of the two busbars;

(2), collect the position of n incoming line switches, the secondary current and the position of section switch, and connect n incoming lines and the exit loop of section switch;

(3) Set the control word "whether the incoming line 1 is active" ... "whether the incoming line n is active", you can choose "0" or "1". How to use: when the opposite side of the incoming line n is the power supply end, then The control word "whether the incoming line n is active" is set to "1". Active" control word is set to "0";

(4) If there is flow in the incoming line n and the switch position is set to the sub-position, it is judged that the switch position of the incoming line n is abnormal, an alarm is issued and the standby automatic switching is blocked;

(5) Judging whether the incoming line n is a working power supply: If the control word "whether the incoming line n is active" is "0", it means that the operation mode of the opposite side of the incoming line n has been changed to load, and the incoming line n is regarded as a bus A load line above is judged as a non-power incoming line. When the control word of "whether the incoming line n is active" is "1", it means that there is power on the opposite side of the incoming line n. At this time, according to the collected incoming line n switch Judging by the position, when the switch position of the incoming line n is close, then the incoming line n is the working power supply;

(6) Charging conditions for segmental standby automatic switching:

Both the I-section busbar and the II-section busbar have three-phase voltage;

There are working power supplies on both the I-section busbar and the II-section busbar;

If any of the following conditions are met, the power supply will be powered on automatically:

Section I busbar or Section II busbar meets the no-voltage condition, and the duration is longer than the specified value of discharge time;

Manually disconnect the working power supply;

There is an external input with locking equipment and automatic switching;

Abnormal switch position;

The circuit breaker refuses to close or jump during the automatic switching operation of the equipment;

If any of the above conditions are met, the standby auto-injector will be discharged.

Action process of section I bus pressure loss, automatic switching mode 1:

After the segmental standby self-injection charging is completed, the I-section bus has no voltage, and the II-section bus has pressure. If it is judged that there is no flow of the working power supply on the I-section bus, the standby auto-injection will start, and the work on the I-section bus will be skipped after a delay. The switch of the power supply, after confirming that all the switches of the working power supply on the I-section bus are tripped, and after the I-section bus has no voltage, close the section switch;

Action process of section II busbar pressure loss, automatic switching mode 2:

After the sub-section automatic switching charging is completed, the second-section bus has no voltage, and the first-section bus has pressure. If it is judged that there is no flow of the working power supply on the second-section bus, the standby automatic switching will start, and the second-section bus will be switched off after a delay. For the switch of the power supply, after confirming that all the switches of the working power on the busbar of the second section have jumped off, and the busbar of the second section has no voltage, close the section switch.

The duration is usually about 10s longer than the specified value of the discharge time.

In summary, compared with the prior art, the present invention has the following advantages:

The backup self-switching method of this application can automatically adjust the charging, discharging and export logic according to the operation mode of the primary equipment, especially when the incoming line changes from a power supply line to a load line or from a load line to a power supply line, it can start the corresponding backup line. The switching logic improves the reliability of the backup automatic switching operation, and avoids the situation that the existing backup automatic switching technology has fixed the operation mode when it is connected, so that the backup automatic switching cannot operate in certain operating modes and cause large-scale power outages.

Description of drawings

Figure 1 is the primary wiring diagram of multiple power supply incoming lines (load lines and main transformers are omitted on the bus).

Figure 2 is the primary wiring diagram of three power supply incoming lines (the load line and main transformer are omitted on the bus.

Figure 3 shows the primary wiring of two power supply incoming lines applicable to conventional standby switching.

Figure 4 is the acquisition loop of the bus voltage.

Figure 5 is the acquisition circuit of the incoming line current.

Figure 6 is the acquisition circuit for the position of the incoming line switch.

Fig. 7 is a logical schematic diagram of working power discrimination.

Figure 8 is a schematic diagram of charge and discharge logic of standby automatic switch.

Detailed ways

The present invention will be described in more detail below in conjunction with examples.

Example 1

The embodiment is illustrated by the common connection mode of two busbars and three power supply incoming lines as shown in Fig. 2 . The implementation method and logic are as follows:

1. Determine whether the incoming line is a working power supply

When "1" is set to "1": 1DL is in position and after 1s delay, the incoming line 1 is judged to be the working power; power supply.

When "Whether incoming line 1 is active" is set to "0": it is judged that incoming line 1 is a non-working power supply

When "Incoming line 2 is active" is set to "1": 2DL is judged to be the working power supply after 1s delay in close position; when 2DL is in the position and 1s delay, it is judged that incoming line 1 is non-working power supply.

When "whether the second incoming line is active" is set to "0": it is judged that the second incoming line is a non-working power supply

When "Whether the third incoming line is active" is set to "1": 3DL is judged to be the working power supply after the 1s delay in closing the position; when the 3DL is in the sub-position and after a 1s delay, the incoming line 1 is judged to be non-working power supply.

When "Whether the incoming line 3 is active" is set to "0": it is judged that the incoming line 3 is a non-working power supply

2. When the active control words of incoming line 1, incoming line 2, and incoming line 3 are all set to "1", that is, when incoming line 1, incoming line 2, and incoming line 3 are all power incoming lines:

Operation mode 1: 1DL on, 2DL on, 3DL off, 4DL on time, the incoming line 1 and the incoming line 2 are judged to be the working power supply, satisfying the three-phase voltage of the two bus sections; both the bus sections I and II are working The charging conditions of the power supply, if there are no other blocking conditions, after a period of time, the sub-section automatic switching mode 1 and automatic switching mode 2 are all charged

If bus I loses voltage due to failure of incoming line 1, at this time, bus II has voltage, bus I has no voltage, and current I1 of incoming line 1 of the working power supply has no current. tor 1DL. If the circuit breaker 1DL does not trip within 5s after sending the trip circuit breaker 1DL command, it will send the alarm of "1DL switch refusal to trip" and "section standby switching failure"; Section breaker 4DL. If the section circuit breaker 4DL is not closed within 5s of the 4DL command to send and close, it will send an alarm of "4DL switch refuses to close" and "Section standby switching failure"; if it is confirmed that the section circuit breaker 4DL is closed, it will send "Section Prepare to cast successfully" message.

If bus II loses voltage due to the failure of the second incoming line, at this time, bus II has no voltage, bus I has voltage, and the current I2 of the second incoming line of the working power supply has no flow, the sub-section standby automatic switch starts, and the circuit is tripped after a trip delay tor 2DL. If the circuit breaker 2DL does not trip within 5s after sending the trip circuit breaker 2DL command, it will send an alarm of "2DL switch refusal to trip" and "section standby switch failure"; Section breaker 4DL. If the section circuit breaker 4DL is not closed within 5s of the 4DL command to send and close, it will send an alarm of "4DL switch refuses to close" and "Section standby switching failure"; if it is confirmed that the section circuit breaker 4DL is closed, it will send "Section Prepare to cast successfully" message.

Operation mode 2: 1DL on, 2DL off, 3DL on, 4DL on time, judge incoming line 1 and incoming line 3 as the working power supply, satisfying the three-phase voltage of the two sections of busbars; both section I busbar and section II busbar are working The charging conditions of the power supply, if there are no other blocking conditions, after a period of time, the sub-section automatic switching mode 1 and automatic switching mode 2 are all charged:

If bus I loses voltage due to failure of incoming line 1, at this time, bus II has voltage, bus I has no voltage, and current I1 of incoming line 1 of the working power supply has no current. tor 1DL. If the circuit breaker 1DL does not trip within 5s after sending the trip circuit breaker 1DL command, it will send the alarm of "1DL switch refusal to trip" and "section standby switching failure"; Section breaker 4DL. If the section circuit breaker 4DL is not closed within 5s of the 4DL command to send and close, it will send an alarm of "4DL switch refuses to close" and "Section standby switching failure"; if it is confirmed that the section circuit breaker 4DL is closed, it will send "Section Prepare to cast successfully" message.

If the voltage of bus II loses voltage due to the failure of the third incoming line, at this time, bus II has no voltage, bus I has voltage, and the current I3 of the third incoming line of the working power supply has no flow, the sub-section standby automatic switch starts, and the circuit is tripped after a tripping delay device 3DL. If the circuit breaker 3DL does not trip within 5s after sending the trip circuit breaker 3DL command, it will send the alarm of "3DL switch refusal to trip" and "section backup switching failure"; Section breaker 4DL. If the section circuit breaker 4DL is not closed within 5s of the 4DL command to send and close, it will send an alarm of "4DL switch refuses to close" and "Section standby switching failure"; if it is confirmed that the section circuit breaker 4DL is closed, it will send "Section Prepare to cast successfully" message.

Operation mode 3: 1DL on, 2DL on, 3DL on, 4DL on time, the incoming line 1, incoming line 2, and incoming line 3 are judged to be the working power supply, which satisfies the three-phase pressure of the two sections of busbars; section I busbar and section II busbar There are charging conditions for the working power supply. If there are no other blocking conditions, after a period of time, the sub-section self-injection mode 1 and auto-injection mode 2 are all charged:

If bus I loses voltage due to failure of incoming line 1, at this time, bus II has voltage, bus I has no voltage, and current I1 of incoming line 1 of the working power supply has no current. tor 1DL. If the circuit breaker 1DL does not trip within 5s after sending the trip circuit breaker 1DL command, it will send the alarm of "1DL switch refusal to trip" and "section standby switching failure"; Section breaker 4DL. If the section circuit breaker 4DL is not closed within 5s of the 4DL command to send and close, it will send an alarm of "4DL switch refuses to close" and "Section standby switching failure"; if it is confirmed that the section circuit breaker 4DL is closed, it will send "Section Prepare to cast successfully" message.

If bus II loses voltage due to faults in incoming line 2 and incoming line 3 or other non-busbar and station faults, at this time, bus II has no voltage, bus I has voltage, the current I2 of the incoming line 2 of the working power supply does not flow, and the working power supply enters The current I3 of line 3 has no flow, and the subsections are automatically switched on to start, and the circuit breakers 2DL and 3DL are tripped after a trip delay. If the circuit breaker 2DL (3DL) does not trip within 5s after sending the command to trip the circuit breaker 2DL (3DL), it will send an alarm of "2DL (3DL) switch refusal to trip" and "segment standby switching failure"; after confirming that the circuit breaker 2DL ( 3DL) jumps off, and closes the section circuit breaker 4DL after a closing delay. If the section circuit breaker 4DL is not closed within 5s of the 4DL command to send and close, it will send an alarm of "4DL switch refuses to close" and "Section standby switching failure"; if it is confirmed that the section circuit breaker 4DL is closed, it will send "Section Prepare to cast successfully" message.

3. When the control words of "whether incoming line 1 is active" and "whether incoming line 2 is active" are set to "1", and the control words "whether incoming line 3 is active" are all set to "0", that is, incoming line 1 and incoming line When line 2 is the power input line: if both 1DL and 2DL are in position, according to the logic of operation mode 1 in the second point, if 1DL and 2DL are not all in position, the charging condition is not met.

When the control words of "whether incoming line 1 is active" and "whether incoming line 3 is active" are set to "1", and the control words "whether incoming line 2 is active" are all set to "0", that is, incoming line 1 and incoming line 3 When it is the power supply line: if both 1DL and 3DL are closed, according to the logic of operation mode 2 in the second point, if 1DL and 3DL are not all closed, the charging condition is not met.

The parts not described in this embodiment are the same as the prior art.

Claims (1)

1. A method for realizing multi-segment standby automatic switching of multiple power supply incoming lines. n incoming lines refer to the situation that n incoming lines may be used as power incoming lines, and the incoming lines that only serve as loads are not connected to the standby automatic switching system. cast, not included in n incoming lines, (1) Collect the secondary voltage of the two busbars; (2) Collect the positions of n incoming line switches, secondary currents and section switches, and connect n incoming lines and the exit circuits of section switches; (3) Set the control words "whether the incoming line 1 is active" ... "whether the incoming line n is active", and you can choose "0" or "1". How to use: When the opposite side of the incoming line n is the power terminal, then control The control word "whether the incoming line n is active" is set to "1". Source" control word is set to "0"; (4) If there is flow in the incoming line n and the switch position is turned into a sub-position, it is judged that the switch position of the incoming line n is abnormal, an alarm is issued and the standby automatic switch is blocked; (5) Judging whether the incoming line n is a working power supply: If the control word of "whether the incoming line n is active" is "0", it means that the operation mode of the opposite side of the incoming line n has been changed to load, and the incoming line n is regarded as a bus It is judged as a non-power incoming line. When the control word "whether the incoming line n is active" is "1", it means that there is power on the opposite side of the incoming line n. At this time, according to the collected switch position of the incoming line n To judge, when the switch position of the incoming line n is close, then the incoming line n is the working power supply, if the switch position of the incoming line n is the sub-position, then the incoming line n is the non-working power supply; (6) Charging conditions for segmental standby automatic switching: Both the I-section busbar and the II-section busbar have three-phase voltage; There are working power supplies on both the I-section busbar and the II-section busbar; If any of the following conditions are met, the power supply will be powered on automatically: Section I busbar or Section II busbar meets the no-voltage condition, and the duration is longer than the specified value of discharge time; Manually disconnect the working power supply; There is an external input with locking equipment and automatic switching; Abnormal switch position; The circuit breaker refuses to close or jump during the automatic switching operation of the equipment; If any of the above conditions are met, the standby auto-injector will be discharged. Action process of section I bus pressure loss, automatic switching mode 1: After the segmental standby self-injection charging is completed, the I-section bus has no voltage, and the II-section bus has pressure. If it is judged that there is no flow of the working power supply on the I-section bus, the standby auto-injection will start, and the work on the I-section bus will be skipped after a delay. The switch of the power supply, after confirming that all the switches of the working power supply on the I-section bus are tripped, and after the I-section bus has no voltage, close the section switch; Action process of section II busbar pressure loss, automatic switching mode 2: After the sub-section automatic switching charging is completed, the second-section bus has no voltage, and the first-section bus has pressure. If it is judged that there is no flow of the working power supply on the second-section bus, the standby automatic switching will start, and the second-section bus will be switched off after a delay. For the switch of the power supply, after confirming that all the switches of the working power on the busbar of the second section have jumped off, and the busbar of the second section has no voltage, close the section switch.