Reverse supply control method based on spare power automatic switching

Abstract

The invention discloses a reverse supply control method based on spare power automatic switching, and belongs to the technical field of power systems and automation thereof. Dynamically matching the current operation mode based on the analog quantity and the switch state information to obtain a substation power supply mode; according to the power supply mode of the transformer substation, carrying out reverse supply logic reconstruction to obtain a current reverse supply operation; and performing risk prevention and control judgment on the current reverse supply operation through a multiple anti-error mechanism to obtain a safe reverse supply control result. According to the invention, through the dynamic identification of the operation mode and the risk prevention and control of the reverse supply operation, the reverse supply operation under a complex power grid structure can be rapidly and reliably realized.

Description

Technical Field

[0001] This invention relates to the field of power systems and their automation technology, and in particular to a reverse power supply control method based on automatic transfer switching. Background Technology

[0002] Modern power grids generally adopt dual or multiple power supply modes, with dual-power substations being the dominant type. They typically operate in a "closed-loop design, open-loop operation" manner, meaning the backup power supply remains in a tripped state. However, in actual operation, due to maintenance, accident handling, or load adjustments, the substation's operating mode needs to be frequently adjusted, thus involving reverse power supply operations.

[0003] The most common method for load transfer during power outages is to first disconnect the main power switch and then switch on the backup power switch. This was a common practice in the past, but the power outage time was relatively long, sometimes reaching 0.5-1 hour, which is clearly unsuitable for current operating requirements. Load transfer without power interruption is also slow, and there are risks of excessive impact and overload during the loop closure process, especially when closing loops across different areas, where there are even more uncertainties. This not only slows down the operation but also significantly impacts decision-making speed. Therefore, a faster method that mitigates these risks is needed to achieve load transfer operations.

[0004] Extensive research has been conducted both domestically and internationally on reverse supply optimization, but significant technical bottlenecks remain. Domestic research mainly focuses on operational process optimization (such as integrated dispatch orders and standby automatic transfer linkage modes), automation technologies (such as "multi-interval one-click sequential control"), and the development of specialized devices (such as fast switching devices), but these studies suffer from issues such as limited functionality or insufficient standardization. Summary of the Invention

[0005] The purpose of this invention is to provide a backup automatic transfer control method to achieve rapid backup operation through a three-step closed-loop mechanism of "extensive data collection - operation mode identification - backup logic reconstruction".

[0006] To achieve the above objectives, the present invention is implemented using the following technical solution:

[0007] This invention provides a reverse power supply control method based on automatic backup switching, comprising:

[0008] Acquire analog signals and switch status information;

[0009] Based on the analog quantity and switch status information, the current operating mode is dynamically matched to obtain the substation power supply mode;

[0010] Based on the substation power supply mode, the reverse supply logic is reconstructed to obtain the current reverse supply operation;

[0011] By employing multiple error prevention mechanisms to assess the risks of the current reverse supply operation, a safe reverse supply control result is obtained.

[0012] Optionally, the analog quantities include: the voltage of each line and the three-phase voltage of each section of the bus for determining the energized state of each line and bus, and the incoming current of each line for determining whether the line is carrying current and for assisting in confirming the actual tripping state of the switch.

[0013] Optionally, the switch status information includes the switch status information of the sectional switches on the bus and each line switch, which is used for both system topology identification and interlocking logic and operation permission judgment.

[0014] Optionally, the dynamic matching of the current operating mode determines the power supply mode of the substation by analyzing the relationship between analog quantities and switch status information in real time;

[0015] When the three-phase voltage of each section busbar is greater than the set voltage, the incoming voltage of the standby line is greater than the set voltage, the section switch is in the closed position, the main power supply line switch is in the closed position, the standby line switch is in the open position, and there are no other interlocking conditions, it is determined that the main power supply line switch is in the running state and the standby line switch is in the standby state.

[0016] When the three-phase voltage of each section busbar is greater than the set voltage, the section switch is in the open position, all line switches are in the closed position, and there are no other blocking conditions, it is determined that each line switch is in the running state and the section switch is in the standby state.

[0017] Optionally, the reverse supply logic includes: power outage reverse supply and parallel reverse supply;

[0018] The power outage reverse supply first trips the main power supply line switch and then closes the standby line switch; the parallel reverse supply first closes the standby line switch and then trips the main power supply line switch.

[0019] The reverse supply logic reconfiguration process involves reconfiguring the reverse supply logic based on the dynamically identified current substation power supply mode to form the allowable state of the corresponding line switches; in the current substation power supply mode, the main supply line switch is allowed to trip, and the backup line switch is allowed to close.

[0020] Optionally, the multiple anti-misoperation mechanisms include: synchronization detection function, overcurrent acceleration protection function, and secondary anti-misoperation mechanism.

[0021] Optionally, the synchronization detection function involves real-time detection of the voltage amplitude, phase difference, and frequency difference across the standby line switch before issuing the closing command; the judgment formula is:

[0022] ,

[0023] in, , These are the voltages on both sides of the backup circuit switch; , These are the phase angles on both sides of the backup line switch; , These represent the frequencies on both sides of the backup line switch; set values. , and These are the maximum allowable voltage difference threshold, maximum phase difference threshold, and maximum frequency difference threshold on both sides of the standby line switch, set according to the power grid operation specifications; closing operation is allowed only when all three conditions are met simultaneously, otherwise the output will be blocked.

[0024] Optionally, the overcurrent acceleration protection function is to quickly trip the circuit breaker when a short circuit or severe overload is detected during parallel reverse power supply, so as to avoid problems such as over-tripping, loss of selectivity, thermal instability and dynamic instability.

[0025] Optionally, the secondary anti-misoperation mechanism is to perform the corresponding operation according to the operation permission status of each switch, including the closing permission status and the opening permission status, where 0 indicates prohibition and 1 indicates permission; the corresponding operation is only performed when the operation permission status is 1.

[0026] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0027] This invention provides a reverse power supply control method based on automatic transfer switch. By establishing a multi-dimensional criterion matrix, it integrates voltage, current, and switch status information to dynamically match the characteristics of the current operating mode. It also introduces multiple anti-misoperation mechanisms, including synchronization detection, overcurrent protection, and secondary anti-misoperation mechanisms, to ensure the correctness and high adaptability of the reverse power supply operation. Through dynamic identification of the operating mode and risk control of the reverse power supply operation, this invention can quickly and reliably realize the reverse power supply operation under complex power grid structures. Attached Figure Description

[0028] Figure 1 This is a flowchart of the reverse supply control method based on automatic backup switching of the present invention;

[0029] Figure 2 This is the main connection diagram of the regional backup automatic switching system of the present invention. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use.

[0031] Example 1:

[0032] This embodiment introduces a reverse supply control method based on automatic backup switching, such as... Figure 1 As shown, it includes:

[0033] Acquire analog signals and switch status information;

[0034] Based on the analog quantity and switch status information, the current operating mode is dynamically matched to obtain the substation power supply mode;

[0035] Based on the substation power supply mode, the reverse supply logic is reconstructed to obtain the current reverse supply operation;

[0036] By employing multiple error prevention mechanisms to assess the risks of the current reverse supply operation, a safe reverse supply control result is obtained.

[0037] Optionally, the analog quantities include: the voltage of each line and the three-phase voltage of each section of the bus for determining the energized state of each line and bus, and the incoming current of each line for determining whether the line is carrying current and for assisting in confirming the actual tripping state of the switch.

[0038] Optionally, the switch status information includes the switch status information of the sectional switches on the bus and each line switch, which is used for both system topology identification and interlocking logic and operation permission judgment.

[0039] Optionally, the dynamic matching of the current operating mode determines the power supply mode of the substation by analyzing the relationship between analog quantities and switch status information in real time;

[0040] When the three-phase voltage of each section busbar is greater than the set voltage, the incoming voltage of the standby line is greater than the set voltage, the section switch is in the closed position, the main power supply line switch is in the closed position, the standby line switch is in the open position, and there are no other interlocking conditions, it is determined that the main power supply line switch is in the running state and the standby line switch is in the standby state.

[0041] When the three-phase voltage of each section busbar is greater than the set voltage, the section switch is in the open position, all line switches are in the closed position, and there are no other blocking conditions, it is determined that each line switch is in the running state and the section switch is in the standby state.

[0042] Optionally, the reverse supply logic includes: power outage reverse supply and parallel reverse supply;

[0043] The power outage reverse supply first trips the main power supply line switch and then closes the standby line switch; the parallel reverse supply first closes the standby line switch and then trips the main power supply line switch.

[0044] The reverse supply logic reconfiguration process involves reconfiguring the reverse supply logic based on the dynamically identified current substation power supply mode to form the allowable state of the corresponding line switches; in the current substation power supply mode, the main supply line switch is allowed to trip, and the backup line switch is allowed to close.

[0045] Optionally, the multiple anti-misoperation mechanisms include: synchronization detection function, overcurrent acceleration protection function, and secondary anti-misoperation mechanism.

[0046] Optionally, the synchronization detection function involves real-time detection of the voltage amplitude, phase difference, and frequency difference across the standby line switch before issuing the closing command; the judgment formula is:

[0047] ,

[0048] in, , These are the voltages on both sides of the backup circuit switch; , These are the phase angles on both sides of the backup line switch; , These represent the frequencies on both sides of the backup line switch; set values. , and These are the maximum allowable voltage difference threshold, maximum phase difference threshold, and maximum frequency difference threshold on both sides of the standby line switch, set according to the power grid operation specifications; closing operation is allowed only when all three conditions are met simultaneously, otherwise the output will be blocked.

[0049] Optionally, the overcurrent acceleration protection function is to quickly trip the circuit breaker when a short circuit or severe overload is detected during parallel reverse power supply, so as to avoid problems such as over-tripping, loss of selectivity, thermal instability and dynamic instability.

[0050] Optionally, the secondary anti-misoperation mechanism is to perform the corresponding operation according to the operation permission status of each switch, including the closing permission status and the opening permission status, where 0 indicates prohibition and 1 indicates permission; the corresponding operation is only performed when the operation permission status is 1.

[0051] Example 2:

[0052] This embodiment describes the implementation process of a backup power supply control method based on automatic transfer switch in a regional backup power supply system, such as... Figure 2 As shown, it includes:

[0053] Obtain analog quantities, including the line voltages of line 1 and line 2, the three-phase voltages of bus #1 and bus #2, and the incoming currents of line 1 and line 2;

[0054] Obtain switch status information, including the switch status information of line 1 switch 1DL, line 2 switch 2DL and sectionalizing switch 3DL.

[0055] By analyzing the relationship between analog quantities and switch status information in real time, the power supply mode of the substation is determined, including 1DL operation, 2DL standby mode, 1DL operation and 3DL standby mode, 2DL operation and 1DL standby mode, 2DL operation and 3DL standby mode, 3DL operation and 1DL standby mode, and 3DL operation and 2DL standby mode.

[0056] The criteria for determining the 1DL operation and 2DL standby modes are as follows: the three-phase voltages of both the #1 bus and the #2 bus are greater than the voltage setting value, the line voltage of line 2 is greater than the voltage setting value, the sectionalizing switch 3DL is in the closed position, the working line 1 switch 1DL is in the closed position, the standby line 2 switch 2DL is in the open position, and there are no other blocking conditions.

[0057] The criteria for determining the 1DL operation and 3DL standby modes are as follows: the three-phase voltages of both the #1 bus and the #2 bus are greater than the set voltage, the sectionalizing switch 3DL is in the open position, the line 1 switch 1DL and the line 2 switch 2DL are in the closed position, and there are no other blocking conditions.

[0058] The criteria for determining the 2DL operation and 1DL standby modes are as follows: the three-phase voltages of both the #1 bus and the #2 bus are greater than the voltage setting value, the line voltage of line 1 is greater than the voltage setting value, the sectionalizing switch 3DL is in the closed position, the working line 2 switch 2DL is in the closed position, the standby line 1 switch 1DL is in the open position, and there are no other blocking conditions.

[0059] The criteria for determining the operation of 2DL and the standby mode of 3DL are as follows: the three-phase voltages of both #1 bus and #2 bus are greater than the set voltage, the sectionalizing switch 3DL is in the open position, the line 1 switch 1DL and the line 2 switch 2DL are in the closed position, and there are no other blocking conditions.

[0060] The criteria for determining the operation of 3DL and the standby mode of 1DL are as follows: the three-phase voltages of both #1 bus and #2 bus are greater than the voltage setting value, the sectionalizing switch 3DL is in the closed position, the line 1 switch 1DL is in the open position, and the line 2 switch 2DL is in the closed position.

[0061] The criteria for determining the 3DL operation and 2DL standby mode are as follows: the three-phase voltages of both the #1 bus and the #2 bus are greater than the set voltage value, the sectionalizing switch 3DL is in the closed position, the line 1 switch 1DL is in the closed position, and the line 2 switch 2DL is in the open position.

[0062] Based on the substation power supply mode, the reverse supply logic is reconstructed.

[0063] By employing multiple error prevention mechanisms to assess the risks of the reconstructed reverse supply logic, a secure reverse supply control result is obtained.

[0064] Before issuing the closing command, the voltage amplitude, phase difference, and frequency difference on both sides of the standby line switch are detected in real time; the judgment formula is:

[0065] ,

[0066] in, , These are the voltages on both sides of the backup circuit switch; , These are the phase angles on both sides of the backup line switch; , These represent the frequencies on both sides of the backup line switch; set values. , and These are the maximum allowable voltage difference threshold, maximum phase difference threshold, and maximum frequency difference threshold on both sides of the standby line switch, set according to the power grid operation specifications; closing operation is allowed only when all three conditions are met simultaneously, otherwise the output will be blocked.

[0067] When real-time detection conditions are met and parallel power supply is performed, the circuit breaker will trip quickly when a short circuit or severe overload is detected, avoiding problems such as cascading tripping, loss of selectivity, thermal instability, and dynamic instability.

[0068] When performing parallel power supply operation, the corresponding operation is executed according to the operation permission status of the power supply, including closing permission status and opening permission status. 0 indicates prohibition and 1 indicates permission; the corresponding operation is executed only when the operation permission status is 1.

[0069] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A reverse supply control method based on automatic backup transfer, characterized in that, include: Acquire analog signals and switch status information; Based on the analog quantity and switch status information, the current operating mode is dynamically matched to obtain the substation power supply mode; Based on the substation power supply mode, the reverse supply logic is reconstructed to obtain the current reverse supply operation; By employing multiple error prevention mechanisms to assess the risks of the current reverse supply operation, a safe reverse supply control result is obtained.

2. The reverse supply control method based on automatic backup switching as described in claim 1, characterized in that, The analog quantities include: the voltage of each line and the three-phase voltage of each section of the busbar used to determine the energized state of each line and busbar, and the incoming current of each line used to determine whether the line is carrying current and to assist in confirming the actual tripping state of the switch.

3. The reverse supply control method based on automatic backup switching as described in claim 1, characterized in that, The switch status information includes the switch status information of the bus section switches and each line switch, which is used for both system topology identification and interlocking logic and operation permission judgment.

4. The reverse supply control method based on automatic backup switching as described in claim 1, characterized in that, The dynamic matching of the current operating mode determines the power supply mode of the substation by analyzing the relationship between analog quantities and switch status information in real time. When the three-phase voltage of each section busbar is greater than the set voltage, the incoming voltage of the standby line is greater than the set voltage, the section switch is in the closed position, the main power supply line switch is in the closed position, the standby line switch is in the open position, and there are no other interlocking conditions, it is determined that the main power supply line switch is in the running state and the standby line switch is in the standby state. When the three-phase voltage of each section busbar is greater than the set voltage, the section switch is in the open position, all line switches are in the closed position, and there are no other blocking conditions, it is determined that each line switch is in the running state and the section switch is in the standby state.

5. The reverse supply control method based on automatic backup switching as described in claim 1, characterized in that, The reverse supply logic includes: power outage reverse supply and parallel reverse supply; The power outage reverse supply first trips the main power supply line switch and then closes the standby line switch; the parallel reverse supply first closes the standby line switch and then trips the main power supply line switch. The reverse supply logic reconfiguration process involves reconfiguring the reverse supply logic based on the dynamically identified current substation power supply mode to form the allowable state of the corresponding line switches; in the current substation power supply mode, the main supply line switch is allowed to trip, and the backup line switch is allowed to close.

6. The reverse supply control method based on automatic backup switching as described in claim 1, characterized in that, The multiple anti-misoperation mechanisms include: synchronization detection function, overcurrent acceleration protection function, and secondary anti-misoperation mechanism.

7. The reverse supply control method based on automatic backup switching as described in claim 6, characterized in that, The synchronization detection function performs real-time detection of the voltage amplitude, phase difference, and frequency difference on both sides of the standby line switch before issuing the closing command; the judgment formula is: ， in, , These are the voltages on both sides of the backup circuit switch; , These are the phase angles on both sides of the backup line switch; , These represent the frequencies on both sides of the backup line switch; set values. , and These are the maximum allowable voltage difference threshold, maximum phase difference threshold, and maximum frequency difference threshold on both sides of the standby line switch, set according to the power grid operation specifications; closing operation is allowed only when all three conditions are met simultaneously, otherwise the output will be blocked.

8. The reverse supply control method based on automatic backup switching as described in claim 6, characterized in that, The overcurrent acceleration protection function is to trip quickly when a short circuit or severe overload is detected during parallel switching of power supply.

9. The reverse supply control method based on automatic backup switching as described in claim 6, characterized in that, The secondary anti-misoperation mechanism executes the corresponding operation based on the operation permission status of each switch, including the closing permission status and the opening permission status. The corresponding operation is executed only when the operation permission status is 1.

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