Logic verification method for backup power source automatic switching device under different test conditions

Abstract

A kind of logic verification method of backup power supply automatic switching device based on different test conditions, the characteristics of backup power supply automatic switching device and specific application scene are combined, and logic verification scheme and method suitable for backup power supply automatic switching device are formulated;Based on ADPSS digital-analog simulation platform test condition, the logic verification method suitable for the logic verification method of backup power supply automatic switching device in closed-loop environment of conventional station is established.Based on relay protection tester test condition, the logic verification method suitable for the logic verification method of backup power supply automatic switching device in open-loop environment of intelligent station is established.The method of the application, based on different test conditions, realizes the logic verification of backup power supply automatic switching device in closed-loop / open-loop environment in different application scenes such as intelligent station, conventional station, and is beneficial to improve the reliability of backup power supply automatic switching device action.

Description

Technical Field

[0001] This invention relates to the field of operation and control technology of automatic transfer switch for backup power supply in power systems, and specifically to a logic verification method for automatic transfer switch for backup power supply under different test conditions. Background Technology

[0002] With socio-economic development, the demand for reliable power supply is increasing, and the integration of new energy sources and other power electronic devices is making the power grid more complex. To improve the reliability of power system operation, automatic transfer switches (ATS) and other safety devices are increasingly being integrated into the power system. ATS can automatically switch on backup power in case of faults in incoming lines, busbars, or transformers, and can also operate in case of circuit breaker tripping, thus improving power supply reliability. However, incorrect operation of ATS can significantly impact power system stability. Therefore, to ensure the accuracy of ATS operation, a comprehensive verification of the device logic is necessary. This verification should be conducted under different test conditions, taking into account the different characteristics of ATS in conventional and intelligent substations. Summary of the Invention

[0003] In order to overcome the shortcomings of the above technologies, this invention provides a logic verification method for automatic transfer switch devices based on different test conditions to improve the reliability of the operation of the automatic transfer switch.

[0004] The technical solution adopted by this invention to overcome its technical problems is:

[0005] A logic verification method for a backup power automatic transfer device under different test conditions includes:

[0006] a) Develop a logic verification method suitable for automatic transfer switch devices, taking into account their characteristics and application scenarios.

[0007] b) For the automatic transfer switch of the backup power supply in a conventional station, a test model of the automatic transfer switch of the backup power supply is built. The test model is composed of the ADPSS digital simulation platform. An electromagnetic transient model of the application scenario of the automatic transfer switch of the backup power supply under test is built in the ADPSS software. The electromagnetic model interacts with the automatic transfer switch of the backup power supply through the physical interface box to exchange circuit breaker state quantities and with the power amplifier to exchange voltage and current.

[0008] c) For the automatic transfer switch of backup power supply in intelligent substations, under the test conditions based on the relay protection tester, establish a logic verification method suitable for the automatic transfer switch of backup power supply in intelligent substations in an open-loop environment.

[0009] Furthermore, the logic verification of the automatic transfer switch in step a) includes:

[0010] a-1) Does the detection device issue a PT disconnection signal when the secondary circuit of the voltage transformer is disconnected?

[0011] a-2) In the case of a broken secondary circuit of a segmented current transformer, does the detection device issue a CT disconnection signal?

[0012] a-3) In the case where the protection device causes the busbar in the station to lose voltage and the automatic transfer switch on the pressure busbar side is not blocked, when the detection device trips the working power circuit breaker, does it trip the secondary load of the regional power grid line connected to the lost voltage busbar?

[0013] a-4) The automatic switching device sends the charging and discharging status signal of the device and checks whether the charging and discharging status signal message matches the actual status of the device.

[0014] a-5) The automatic reset logic of the standby automatic transfer device is detected to determine whether the device is allowed to operate again after the corresponding charging conditions are met.

[0015] a-6) After the automatic transfer switch is started and tripped due to bus voltage failure, if the delay time has not reached the action set value and the tripping start conditions are no longer met, the action status of the switch is monitored.

[0016] a-7) When the sectionalizing circuit breaker is automatically switched to the faulty bus or faulty equipment, does the detection device start the accelerated protection after closing?

[0017] a-8) In the event of equipment overload after automatic switching closing, does the detection device activate overload relief?

[0018] a-9) When the sectional circuit breaker is automatically switched to the faulty bus or faulty equipment, and the revoltage conditions of both bus sections are met, the operation of the detection device is observed.

[0019] Furthermore, the segmented current transformer in step a-2) is divided into an internal bridge current transformer and a bus tie current transformer.

[0020] Furthermore, the sectionalizing circuit breakers in steps a-7) and a-9) are bus tie circuit breakers.

[0021] Furthermore, step b) includes the following steps:

[0022] b-1) The ADPSS electromagnetic model outputs the voltage, current and circuit breaker position required for the automatic transfer switch to charge the automatic transfer switch. The automatic transfer switch has no other interlocking conditions set. The model checks whether the automatic transfer switch is charging.

[0023] b-2) The ADPSS electromagnetic model works in conjunction with the automatic transfer switch to detect whether the automatic transfer switch is discharging.

[0024] b-3) The ADPSS electromagnetic model outputs the voltage, current and circuit breaker position required for the automatic transfer switch to operate, determines the symbol requirements of the automatic transfer switch, and checks whether the automatic transfer switch operates.

[0025] b-4) The ADPSS electromagnetic model works in conjunction with the automatic transfer switch to check whether the automatic transfer switch is locked and to verify the technical principles of the automatic transfer switch.

[0026] Furthermore, the process of the ADPSS electromagnetic model cooperating with the standby power automatic transfer device in step b-2) includes: the ADPSS model outputs a standby incoming line voltage that is 15s lower than the voltage set value, the standby power automatic transfer device blocks the standby automatic transfer input, and the circuit breaker position is abnormal.

[0027] Furthermore, the process of the ADPSS electromagnetic model cooperating with the standby power supply automatic transfer device in step b-4) includes: the operation of the protection device that trips the standby circuit breaker, and the standby circuit breaker automatically transferring to the faulty bus or faulty equipment.

[0028] The beneficial effects of this invention are: It formulates a logic verification scheme and method suitable for automatic transfer switches (ATS) based on the characteristics and specific application scenarios of APSS; it establishes a logic verification method suitable for conventional ATS in a closed-loop environment based on the ADPSS digital simulation platform test conditions; and it establishes a logic verification method suitable for intelligent ATS in an open-loop environment based on the relay protection tester test conditions. The method of this invention, based on different test conditions, realizes logic verification of ATS in closed-loop / open-loop environments in different application scenarios such as intelligent stations and conventional stations, which is beneficial to improving the reliability of ATS operation. Attached Figure Description

[0029] Figure 1 This is a flowchart of the logic verification method for the automatic transfer switch of backup power under different test conditions according to the present invention.

[0030] Figure 2 This is the waveform recording result of the backup power automatic transfer device under the test conditions of the ADPSS digital simulation platform in this embodiment of the invention;

[0031] Figure 3 This is a test environment built based on the test conditions of a relay protection tester in an embodiment of the present invention. Detailed Implementation

[0032] The following is in conjunction with the appendix Figure 1 Appendix Figure 2 Appendix Figure 3 The present invention will be further described below.

[0033] A logic verification method for a backup power automatic transfer device under different test conditions includes:

[0034] a) Based on the characteristics and application scenarios of the automatic transfer switch for backup power, develop a logic verification method suitable for the automatic transfer switch for backup power.

[0035] (b) For conventional power supply automatic transfer switches (ATS) in substations, a test model suitable for relevant models of ATS is built based on the ADPSS digital simulation platform. The ADPSS platform mainly consists of a server, a physical interface box, a power amplifier, and related software. To enable testing of ATS, this test model utilizes the ADPSS platform. An electromagnetic transient model of the application scenario of the tested ATS is built within the ADPSS software. This electromagnetic model interacts with the ATS via the physical interface box to exchange circuit breaker status variables and with the power amplifier to exchange voltage and current. This allows for semi-physical testing of ATS based on the ADPSS digital simulation platform.

[0036] c) For the automatic transfer switch of backup power supply in intelligent substations, under the test conditions based on the relay protection tester, establish a logic verification method suitable for the automatic transfer switch of backup power supply in intelligent substations in an open-loop environment.

[0037] For conventional substation standby power automatic transfer switches (ATS), a test model suitable for relevant models of APSS ATS was built based on the ADPSS digital simulation platform test conditions. During the operation of the APSS ATS, the circuit breaker operation was recorded using ADPSS, as shown in the attached figure. Figure 2 As shown. (Through the attached...) Figure 2 It can be seen that this automatic transfer switch for backup power can realize the automatic transfer function of the backup incoming circuit breaker. The test environment built based on the test conditions of the relay protection tester for the automatic transfer switch for backup power in intelligent substations is shown in the attached figure. Figure 3 As shown, this invention, considering the characteristics and specific application scenarios of automatic transfer switches (ATS), formulates logic verification schemes and methods suitable for ATS. Based on the ADPSS digital simulation platform test conditions, a logic verification method suitable for conventional station ATS in a closed-loop environment is established. Based on the relay protection tester test conditions, a logic verification method suitable for intelligent station ATS in an open-loop environment is established. The method of this invention, based on different test conditions, realizes logic verification of ATS in closed-loop / open-loop environments in different application scenarios such as intelligent stations and conventional stations, which helps improve the reliability of ATS operation and safeguards the safe and stable operation of the system.

[0038] Example 1:

[0039] The logic verification of the automatic transfer switch in step a) includes:

[0040] a-1) In the event that the secondary circuit of the voltage transformer is disconnected, does the detection device issue a PT disconnection signal?

[0041] a-2) In the event of a break in the secondary circuit of the segmented current transformer, does the detection device issue a CT disconnection signal? (The CT disconnection alarm function is not considered for the extended internal bridge automatic transfer device.)

[0042] a-3) If the protection device causes the busbar in the station to lose voltage and the automatic transfer switch on the pressure busbar side is not blocked, when the detection device trips the working power circuit breaker, should it trip the secondary load of the regional power grid line connected to the undervoltage busbar (and the parallel compensation capacitor should also be tripped if necessary)?

[0043] a-4) The automatic switching device sends the charging and discharging status signals of the device and checks whether the charging and discharging status signal messages match the actual status of the device.

[0044] a-5) The automatic reset logic of the standby automatic transfer device is used to detect whether the device is allowed to operate again after the corresponding charging conditions are met.

[0045] a-6) After the automatic transfer switch trips due to bus voltage failure, if the delay time has not reached the action set value and the tripping conditions are no longer met, the action status of the switch will be monitored.

[0046] a-7) When the sectional circuit breaker is automatically switched to the faulty bus or faulty equipment, the detection device should be activated to accelerate protection after closing.

[0047] a-8) In the event of equipment overload after automatic switching closing, whether the detection device activates overload reduction.

[0048] a-9) When the sectional circuit breaker is automatically switched to the faulty bus or faulty equipment, and the revoltage conditions of both bus sections are met, the operation of the detection device is observed.

[0049] Example 2:

[0050] The segmented current transformer in step a-2) is divided into an internal bridge current transformer and a bus tie current transformer.

[0051] Example 3:

[0052] The sectional circuit breakers in steps a-7) and a-9) are bus tie circuit breakers.

[0053] Example 4:

[0054] Step b) includes the following steps:

[0055] b-1) The ADPSS electromagnetic model outputs the voltage, current and circuit breaker position required for the automatic transfer switch to charge the automatic transfer switch. The automatic transfer switch has no other interlocking conditions set. The model checks whether the automatic transfer switch is charging.

[0056] b-2) The ADPSS electromagnetic model works in conjunction with the automatic transfer switch to detect whether the automatic transfer switch is discharging.

[0057] b-3) The ADPSS electromagnetic model outputs the voltage, current and circuit breaker position required for the automatic transfer switch to operate, determines the symbol requirements of the automatic transfer switch, and checks whether the automatic transfer switch operates.

[0058] b-4) The ADPSS electromagnetic model works in conjunction with the automatic transfer switch to check whether the automatic transfer switch is locked and to verify the technical principles of the automatic transfer switch.

[0059] Example 5:

[0060] The process of the ADPSS electromagnetic model and the automatic transfer switch in step b-2) includes: the ADPSS model outputs a backup incoming line voltage that is 15 seconds lower than the set voltage, the automatic transfer switch is locked, and the circuit breaker position is abnormal.

[0061] Example 6:

[0062] The process of the ADPSS electromagnetic model cooperating with the standby power supply automatic transfer device in step b-4) includes: the protection device that trips the standby circuit breaker operates, and the standby circuit breaker automatically transfers to the faulty bus or faulty equipment.

[0063] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A logic verification method for a backup power automatic transfer device under different test conditions, characterized in that, include: a) Develop a logic verification method suitable for automatic transfer switch devices, taking into account their characteristics and application scenarios. b) For the automatic transfer switch of the backup power supply in conventional stations, a test model of the automatic transfer switch of the backup power supply is built. The test model is composed of the ADPSS digital simulation platform. An electromagnetic transient model of the application scenario of the automatic transfer switch of the backup power supply under test is built in the ADPSS software. The electromagnetic model interacts with the automatic transfer switch of the backup power supply through the physical interface box, etc., to exchange circuit breaker state quantities, and interacts with voltage, current, etc. through the physical interface box and power amplifier. c) For the automatic transfer switch of backup power supply in intelligent substations, under the test conditions based on the relay protection tester, establish a logic verification method suitable for the automatic transfer switch of backup power supply in intelligent substations in an open-loop environment; Step b) includes the following steps: b-1) The ADPSS electromagnetic model outputs the voltage, current and circuit breaker position required for the automatic transfer switch to charge the automatic transfer switch. The automatic transfer switch has no other interlocking conditions set. The model checks whether the automatic transfer switch is charging. b-2) The ADPSS electromagnetic model works in conjunction with the automatic transfer switch to detect whether the automatic transfer switch is discharging. b-3) The ADPSS electromagnetic model outputs the voltage, current and circuit breaker position required for the automatic transfer switch to operate, determines the symbol requirements of the automatic transfer switch, and checks whether the automatic transfer switch operates. b-4) The ADPSS electromagnetic model works in conjunction with the automatic transfer switch to check whether the automatic transfer switch is locked and to verify the technical principles of the automatic transfer switch. The process of the ADPSS electromagnetic model and the automatic transfer switch in step b-2) includes: the ADPSS model outputs a backup incoming line voltage that is 15 seconds lower than the voltage setting value, the automatic transfer switch locks the backup input, and the circuit breaker position is abnormal. The process of the ADPSS electromagnetic model cooperating with the standby power supply automatic transfer device in step b-4) includes: the protection device that trips the standby circuit breaker operates, and the standby circuit breaker automatically transfers to the faulty bus or faulty equipment.

2. The logic verification method for automatic transfer switch of backup power supply under different test conditions according to claim 1, characterized in that, The logic verification of the automatic transfer switch in step a) includes: a-1) Does the detection device issue a PT disconnection signal when the secondary circuit of the voltage transformer is disconnected? a-2) In the case of a broken secondary circuit of a segmented current transformer, does the detection device issue a CT disconnection signal? a-3) In the case where the protection device causes the busbar in the station to lose voltage and the automatic transfer switch on the pressure busbar side is not blocked, when the detection device trips the working power circuit breaker, does it trip the secondary load of the regional power grid line connected to the lost voltage busbar? a-4) The automatic switching device sends the charging and discharging status signal of the device and checks whether the charging and discharging status signal message matches the actual status of the device. a-5) The automatic reset logic of the standby automatic transfer device is detected to determine whether the device is allowed to operate again after the corresponding charging conditions are met. a-6) After the automatic transfer switch is started and tripped due to bus voltage failure, if the delay time has not reached the action set value and the tripping start conditions are no longer met, the action status of the switch is monitored. a-7) When the sectionalizing circuit breaker is automatically switched to the faulty bus or faulty equipment, does the detection device start the accelerated protection after closing? a-8) In the event of equipment overload after automatic switching closing, does the detection device activate overload relief? a-9) When the sectional circuit breaker is automatically switched to the faulty bus or faulty equipment, and the revoltage conditions of both bus sections are met, the operation of the detection device is observed.

3. The logic verification method for automatic transfer switch of backup power supply under different test conditions according to claim 2, characterized in that: The segmented current transformer in step a-2) is divided into an internal bridge current transformer and a bus tie current transformer.

4. The logic verification method for automatic transfer switch of backup power supply under different test conditions according to claim 2, characterized in that: The sectional circuit breakers in steps a-7) and a-9) are bus tie circuit breakers.

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