A voltage detection method and device for single-wire power supply substation

Abstract

The application discloses a voltage detection method and device of a single-line power supply transformer substation. The voltage detection method of the single-line power supply transformer substation provided by the embodiment of the application is applied to a power system and is executed by a voltage detection device of the single-line power supply transformer substation. The method comprises the following steps: acquiring parameter information of a power supply transformer substation; determining a state parameter value of the power supply transformer substation according to the parameter information; determining a voltage state of the single-line power supply transformer substation according to the state parameter value of the power supply transformer substation; and outputting a loss-of-voltage alarm signal of the single-line power supply transformer substation according to the voltage state of the single-line power supply transformer substation. The technical scheme of the embodiment of the application determines the voltage state of the single-line power supply transformer substation by acquiring the parameter information of the power supply transformer substation, confirms whether the loss-of-voltage alarm signal needs to be sent, and realizes accurate judgment on whether the single-line power supply transformer substation loses voltage, thereby preventing the single-line single transformer substation from sending the loss-of-voltage alarm by mistake during power supply via a bypass bus and during a related dispatching operation process.

Description

Technical Field

[0001] This invention relates to the field of power grid detection technology, and in particular to a voltage detection method and device for a single-line power supply substation. Background Technology

[0002] In the real-time dispatch and operation monitoring of power systems, substation undervoltage alarms are a fundamental and crucial alarm, providing important data for power grid accident handling and information transmission. However, some single-line power supply substations cannot directly collect and transmit all electrical quantities within the substation to the power dispatch automation system of the dispatching department. This results in a lack of judgment conditions for undervoltage alarms, leading to misjudgments of undervoltage during real-time power dispatch operations. Summary of the Invention

[0003] This invention provides a voltage detection method and device for a single-line power supply substation to solve the problem of false undervoltage judgment in a single-line power supply substation.

[0004] According to one aspect of the present invention, a voltage detection method for a single-line power supply substation is provided, applied to a power system, the power system including a voltage detection device for a single-line power supply substation, a power supply substation, and a single-line power supply substation; the voltage detection method for the single-line power supply substation is performed by the voltage detection device of the single-line power supply substation; the method includes:

[0005] Obtain the parameter information of the power substation;

[0006] Based on the parameter information, determine the status parameter values ​​of the power substation;

[0007] Based on the state parameter values ​​of the power supply substation, determine the voltage status of the single-line power supply substation;

[0008] Based on the voltage status of the single-line power supply substation, output the undervoltage alarm signal of the single-line power supply substation.

[0009] Optionally, the power substation includes a first busbar and a second busbar. The first busbar supplies power to the single-line power supply substation through a first switch, and the second busbar supplies power to the single-line power supply substation through a bypass switch. The single-line power supply substation includes a third busbar and a second switch. The third busbar is connected to the power substation's transmission line through the second switch.

[0010] The acquisition of parameter information of the power substation includes:

[0011] Obtain the first parameter information of the first switch of the power substation, wherein the first parameter information includes at least the switch position, active power and A-phase current value;

[0012] Obtain the second parameter information of the bypass switch of the power substation, the second parameter information including the position of the disconnect switch;

[0013] Obtain the third parameter information of the second busbar of the power substation, the third parameter information including the line voltage telemetry value.

[0014] Optionally, determining the state parameter values ​​of the power substation based on the parameter information includes:

[0015] Based on the first parameter information, determine the first state parameter value of the first switch;

[0016] Based on the second parameter information, determine the second state parameter value of the bypass switch;

[0017] Based on the third parameter information, determine the third state parameter value of the second busbar;

[0018] The state parameter values ​​include a first state parameter value, a second state parameter value, and a third state parameter value.

[0019] Optionally, determining the first state parameter value of the first switch based on the first parameter information includes:

[0020] When the first switch is closed, the state value of the switch position is 1; when the first switch is open, the state value of the switch position is 0.

[0021] When the active power is greater than the preset power threshold, the active power state value of the first switch is 1; when the active power of the first switch is less than or equal to the preset power threshold, the active power state value of the first switch is 0.

[0022] When the current value of phase A of the first switch is greater than the preset current threshold, the state value of the current of phase A of the first switch is 1; when the current value of phase A of the first switch is less than or equal to the preset current threshold, the state value of the current of phase A of the first switch is 0.

[0023] Optionally, determining the second state parameter value of the bypass switch based on the second parameter information includes:

[0024] When the bypass switch's disconnector is closed, the state value of the bypass switch's disconnector position is 1; when the bypass switch's disconnector is open, the state value of the bypass switch's disconnector position is 0.

[0025] Optionally, determining the third state parameter value of the second busbar based on the third parameter information includes:

[0026] When the telemetry value of the line voltage of the second bus is greater than the preset voltage threshold, the state value of the line voltage of the second bus is 1; when the telemetry value of the line voltage of the second bus is less than or equal to the preset voltage threshold, the state value of the line voltage of the second bus is 0.

[0027] Optionally, determining the voltage state of a single-line power supply substation based on the state parameter values ​​of the power substation includes:

[0028] When all the first state parameter values ​​are 0, the second state parameter values ​​are compared with the first preset condition to generate a first comparison result;

[0029] Based on the first comparison result, the third state parameter value is compared with the second preset condition to generate a second comparison result;

[0030] Based on the first comparison result and the second comparison result, the voltage status of the single-line power supply substation is determined.

[0031] Optionally, determining the voltage status of a single-line power supply substation based on the first comparison result and the second comparison result includes:

[0032] When the second state parameter is 0, the voltage state of the single-line power supply substation is determined to be undervoltage.

[0033] When the second state parameter is 1 and the third state parameter is 0, the voltage state of the single-line power supply substation is determined to be undervoltage.

[0034] When the second state parameter is 1 and the third state parameter is 1, the voltage state of the single-line power supply substation is determined to be a voltage-enabled state.

[0035] Optionally, the step of outputting a voltage undervoltage alarm signal for the single-line power supply substation based on its voltage status includes:

[0036] When the voltage status of the single-line power supply substation is undervoltage, an undervoltage alarm signal for the single-line power supply substation is output.

[0037] Secondly, embodiments of the present invention provide a voltage detection device for a single-line power supply substation, applied to a power system, the power system further including a power supply substation and a single-line power supply substation; the voltage detection device for the single-line power supply substation is used to execute the voltage detection method for the single-line power supply substation according to any one of claims 1 to 9;

[0038] The voltage detection device for the single-line power supply substation includes:

[0039] The acquisition module is used to acquire parameter information of the power substation;

[0040] The status parameter determination module is used to determine the status parameter values ​​of the power substation based on the parameter information.

[0041] The voltage status calculation module is used to determine the voltage status of a single-line power supply substation based on the status parameter values ​​of the power supply substation.

[0042] The alarm control module is used to output a voltage undervoltage alarm signal for the single-line power supply substation based on the voltage status of the single-line power supply substation.

[0043] The technical solution of this invention determines the status parameter values ​​of the power substation by acquiring its parameter information, and then determines the voltage status of the single-line power supply substation based on these parameters. It then determines whether the single-line power supply substation is undervoltage based on its voltage status, and if so, outputs an undervoltage alarm signal. This invention provides a voltage detection method for single-line power supply substations that uses the power substation's parameter information to confirm whether an undervoltage warning is needed. This method accurately determines whether a single-line power supply substation is undervoltage, preventing false undervoltage alarms from being issued during power supply via a bypass bus and during related scheduling operations.

[0044] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 This is a flowchart of a voltage detection method for a single-line power supply substation provided in an embodiment of the present invention;

[0047] Figure 2 This is a schematic diagram of a substation undervoltage identification and judgment principle provided by an embodiment of the present invention;

[0048] Figure 3 This is a flowchart of another voltage detection method for a single-line power supply substation provided in an embodiment of the present invention;

[0049] Figure 4This is a flowchart of another voltage detection method for a single-line power supply substation provided in an embodiment of the present invention;

[0050] Figure 5 This is a flowchart of another voltage detection method for a single-line power supply substation provided in an embodiment of the present invention;

[0051] Figure 6 This is a flowchart of another voltage detection method for a single-line power supply substation provided in an embodiment of the present invention;

[0052] Figure 7 This is a flowchart of another voltage detection method for a single-line power supply substation provided in an embodiment of the present invention;

[0053] Figure 8 This is a flowchart of another voltage detection method for a single-line power supply substation provided in an embodiment of the present invention;

[0054] Figure 9 This is a flowchart of another voltage detection method for a single-line power supply substation provided in an embodiment of the present invention;

[0055] Figure 10 This is a flowchart of another voltage detection method for a single-line power supply substation provided in an embodiment of the present invention;

[0056] Figure 11 A logic diagram of a voltage detection method for a single-line power supply substation provided in this embodiment of the invention;

[0057] Figure 12 This is a schematic diagram of the structure of a voltage detection device for a single-line power supply substation provided in an embodiment of the present invention. Detailed Implementation

[0058] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0059] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0060] Figure 1 This is a flowchart of a voltage detection method for a single-line power supply substation provided in an embodiment of the present invention. Figure 2 This is a schematic diagram illustrating the principle of substation undervoltage identification and judgment provided in an embodiment of the present invention. See also... Figure 1 and Figure 2 The voltage detection method for a single-line power supply substation provided in this embodiment of the invention is applied to a power system, which includes a voltage detection device for a single-line power supply substation, a power supply substation, and a single-line power supply substation; the voltage detection method for the single-line power supply substation is executed by the voltage detection device of the single-line power supply substation.

[0061] Specifically, substation undervoltage detection typically relies on four criteria: the remote signaling position of the switch on the opposite side of the power supply line, telemetry data of the switch on the opposite side of the power supply line, telemetry data of the incoming line switches of this substation, and telemetry data of the bus voltage at each voltage level of this substation. Single-line power supply substations, unable to upload their own parameters, lack two criteria: the telemetry data of the incoming line switches and the telemetry data of the bus voltage at each voltage level of this substation. This can lead to misjudgments of undervoltage. For example... Figure 2 Since it is impossible to obtain the various parameters of the single-line power supply substation B, the judgment of the voltage loss of substation B can only be made by the opening and closing of the first switch 3 of the power supply substation A and the parameter information, which makes it impossible to accurately judge the voltage loss of substation B.

[0062] Voltage detection methods for single-line power supply substations include:

[0063] S101. Obtain the parameter information of the power substation.

[0064] Specifically, the parameter information of the power supply substation is obtained to determine the undervoltage situation of a single-line power supply substation. The parameter information includes data such as the power, voltage, current of the power supply substation grounding switch line and the closing status of the power supply substation switch.

[0065] S102. Determine the status parameter values ​​of the power substation based on the parameter information.

[0066] Specifically, the status parameter values ​​of the power supply substation can be confirmed through the parameter information of the power supply substation, which is used to determine the voltage status of a single-line power supply substation.

[0067] S103. Determine the voltage status of the single-line power supply substation based on the status parameter values ​​of the power supply substation.

[0068] Specifically, a single-line substation is supplied by a power source substation. When the power source substation supplies power to the single-line substation, the voltage status of the single-line substation cannot be directly determined because its data parameters cannot be uploaded. However, when the power source substation supplies power to the single-line substation, its various parameters are directly available. The status parameter values ​​of the power source substation can indirectly confirm whether it is supplying power to the single-line substation, thus confirming the voltage status of the single-line substation. The voltage status of a single-line substation includes two states: normal and undervoltage.

[0069] S104. Based on the voltage status of the single-line power supply substation, output the undervoltage alarm signal of the single-line power supply substation.

[0070] Specifically, when the voltage status of a single-line power supply substation is judged to be normal, the substation will not issue a voltage undervoltage alarm signal; when the voltage status of a single-line power supply substation is judged to be undervoltage, the substation will issue a voltage undervoltage alarm signal.

[0071] The voltage detection method for single-line power supply substations provided in this embodiment acquires parameter information of the power supply substation to determine its status parameter values, and then determines the voltage status of the single-line power supply substation based on these values. If the voltage status of the single-line power supply substation is determined to be undervoltage, the substation issues an undervoltage alarm signal. If the voltage status is determined to be normal, the substation does not issue an undervoltage alarm signal and continues normal operation. This method accurately determines whether a single-line power supply substation is undervoltage, preventing erroneous undervoltage alarms from being issued by the single-line, single-transformer substation during power supply via a bypass bus and during related dispatching operations, thus improving the substation's operational efficiency.

[0072] Optional, Figure 3 This is a flowchart of another voltage detection method for a single-line power supply substation provided by an embodiment of the present invention. Based on the above embodiment, see... Figure 2 and Figure 3The power supply substation includes a first busbar and a second busbar. The first busbar supplies power to the single-line power supply substation through a first switch, and the second busbar supplies power to the single-line power supply substation through a bypass switch. The single-line power supply substation includes a third busbar and a second switch. The third busbar is connected to the power supply substation's transmission line through the second switch.

[0073] Specifically, power substation A can supply power to single-line power supply substation B through the first bus 10 or the second bus 20. When the first switch 3 is closed, the first bus 10 supplies power to single-line power supply substation B. When the bypass switch 2 is closed, the second bus 20 supplies power to single-line power supply substation B.

[0074] Voltage detection methods for single-line power supply substations include:

[0075] S201. Obtain the first parameter information of the first switch of the power substation.

[0076] The first parameter information includes at least the switch position, active power, and A-phase current value.

[0077] Specifically, the first parameter information of the first switch is used to determine whether the power substation can supply power to the single-line power supply substation through the first bus. The first parameter information includes at least the switch position, active power, and A-phase current value. The switch position can determine whether the first bus is connected to the single-line power supply substation, and the active power and A-phase current value can determine whether the first bus supplies power to the single-line power supply substation.

[0078] S202. Obtain the second parameter information of the bypass switch of the power substation.

[0079] The second parameter information includes the position of the disconnect switch.

[0080] Specifically, the second parameter information of the bypass switch of the power supply substation is used to determine whether the power supply substation can supply power to the single-line power supply substation through the second busbar. The position of the disconnect switch can determine whether the connection between the second busbar and the single-line power supply substation is established.

[0081] S203. Obtain the third parameter information of the second busbar of the power supply substation.

[0082] The third parameter information includes the line voltage telemetry value.

[0083] Specifically, the third parameter information includes the line voltage telemetry value, which can determine whether the second busbar supplies power to a single-line power supply substation.

[0084] S102. Determine the status parameter values ​​of the power substation based on the parameter information.

[0085] S103. Determine the voltage status of the single-line power supply substation based on the status parameter values ​​of the power supply substation.

[0086] S104. Based on the voltage status of the single-line power supply substation, output the undervoltage alarm signal of the single-line power supply substation.

[0087] Optional, Figure 4 This is a flowchart illustrating another voltage detection method for a single-line power supply substation provided in this embodiment of the invention. Based on the above embodiments, see... Figure 4 Voltage detection methods for single-line power supply substations include:

[0088] S101. Obtain the parameter information of the power substation.

[0089] S301. Determine the first state parameter value of the first switch based on the first parameter information.

[0090] Specifically, by judging the parameter information, different state parameter values ​​are assigned to each parameter information, and then the state parameter values ​​are used to determine whether a single-line substation has lost voltage. The first state parameter value of the first switch includes the state value of the switch position, the state value of the active power, and the state value of the A-phase current.

[0091] S302. Determine the second state parameter value of the bypass switch based on the second parameter information.

[0092] Specifically, the value of the second state parameter can be determined based on the position of the bypass switch's disconnector.

[0093] S303. Determine the third state parameter value of the second busbar based on the third parameter information.

[0094] The state parameter values ​​include a first state parameter value, a second state parameter value, and a third state parameter value.

[0095] Specifically, the third state parameter value of the second busbar can be determined based on the telemetry value of the line voltage of the second busbar. The state parameter values ​​include the first state parameter value, the second state parameter value, and the third state parameter value, which are used to determine whether a single-line substation has lost voltage.

[0096] S103. Determine the voltage status of the single-line power supply substation based on the status parameter values ​​of the power supply substation.

[0097] S104. Based on the voltage status of the single-line power supply substation, output the undervoltage alarm signal of the single-line power supply substation.

[0098] Optional, Figure 5This is a flowchart illustrating another voltage detection method for a single-line power supply substation provided in this embodiment of the invention. Based on the above embodiments, see... Figure 5 Voltage detection methods for single-line power supply substations include:

[0099] S101. Obtain the parameter information of the power substation.

[0100] S401. When the first switch is closed, the state value of the switch position is 1; when the first switch is open, the state value of the switch position is 0.

[0101] Specifically, when the first switch is closed, the first busbar can supply power to the single-line power supply substation, and the switch position status value is set to 1. When the first switch is open, the first busbar cannot supply power to the single-line power supply substation, and the switch position status value is set to 0.

[0102] S402. When the active power is greater than the preset power threshold, the active power state value of the first switch is 1; when the active power of the first switch is less than or equal to the preset power threshold, the active power state value of the first switch is 0.

[0103] Specifically, the preset power threshold is used to determine whether the active power of the line from the power substation to the single-line power supply substation meets the power supply standard. When the active power is greater than the preset power threshold, the active power meets the power supply standard, and the active power status value is set to 1. When the active power is less than the preset power threshold, the active power does not meet the power supply standard, and the active power status value is set to 0.

[0104] S403. When the current value of phase A of the first switch is greater than the preset current threshold, the state value of the current of phase A of the first switch is 1; when the current value of phase A of the first switch is less than or equal to the preset current threshold, the state value of the current of phase A of the first switch is 0.

[0105] Specifically, the preset current threshold is used to determine whether the current in the line from the power substation to the single-line power supply substation meets the power supply standard. When the A-phase current value is greater than the preset current threshold, the A-phase current value meets the power supply standard, and the status value of the A-phase current value is set to 1. When the A-phase current value is less than the preset current threshold, the A-phase current value does not meet the power supply standard, and the status value of the A-phase current value is set to 0.

[0106] S302. Determine the second state parameter value of the bypass switch based on the second parameter information.

[0107] S303. Determine the third state parameter value of the second busbar based on the third parameter information.

[0108] S103. Determine the voltage status of the single-line power supply substation based on the status parameter values ​​of the power supply substation.

[0109] S104. Based on the voltage status of the single-line power supply substation, output the undervoltage alarm signal of the single-line power supply substation.

[0110] Optional, Figure 6 This is a flowchart illustrating another voltage detection method for a single-line power supply substation provided in this embodiment of the invention. Based on the above embodiments, see... Figure 6 Voltage detection methods for single-line power supply substations include:

[0111] S101. Obtain the parameter information of the power substation.

[0112] S301. Determine the first state parameter value of the first switch based on the first parameter information.

[0113] S501. When the disconnector of the bypass switch is closed, the state value of the disconnector position of the bypass switch is 1; when the disconnector of the bypass switch is open, the state value of the disconnector position of the bypass switch is 0.

[0114] Specifically, when the bypass switch is closed, the second busbar can supply power to the single-line power supply substation, and the switch position status value is set to 1. When the bypass switch is open, the second busbar cannot supply power to the single-line power supply substation, and the switch position status value is set to 0.

[0115] S303. Determine the third state parameter value of the second busbar based on the third parameter information.

[0116] S103. Determine the voltage status of the single-line power supply substation based on the status parameter values ​​of the power supply substation.

[0117] S104. Based on the voltage status of the single-line power supply substation, output the undervoltage alarm signal of the single-line power supply substation.

[0118] Optional, Figure 7 This is a flowchart illustrating another voltage detection method for a single-line power supply substation provided in this embodiment of the invention. Based on the above embodiments, see... Figure 7 Voltage detection methods for single-line power supply substations include:

[0119] S101. Obtain the parameter information of the power substation.

[0120] S301. Determine the first state parameter value of the first switch based on the first parameter information.

[0121] S302. Determine the second state parameter value of the bypass switch based on the second parameter information.

[0122] S601. When the telemetry value of the line voltage of the second bus is greater than the preset voltage threshold, the state value of the line voltage of the second bus is 1; when the telemetry value of the line voltage of the second bus is less than or equal to the preset voltage threshold, the state value of the line voltage of the second bus is 0.

[0123] Specifically, the telemetry value of the line voltage of the second busbar is used to determine whether the voltage of the line from the second busbar of the power supply substation to the single-line power supply substation meets the power supply standard. When the telemetry value of the line voltage is greater than the preset voltage threshold, the line voltage of the second busbar meets the power supply standard, and the status value of the line voltage of the second busbar is set to 1. When the telemetry value of the line voltage is less than the preset voltage threshold, the line voltage of the second busbar does not meet the power supply standard, and the status value of the line voltage of the second busbar is set to 0.

[0124] S103. Determine the voltage status of the single-line power supply substation based on the status parameter values ​​of the power supply substation.

[0125] S104. Based on the voltage status of the single-line power supply substation, output the undervoltage alarm signal of the single-line power supply substation.

[0126] Optional, Figure 8 This is a flowchart illustrating another voltage detection method for a single-line power supply substation provided in this embodiment of the invention. Based on the above embodiments, see... Figure 8 Voltage detection methods for single-line power supply substations include:

[0127] S101. Obtain the parameter information of the power substation.

[0128] S301. Determine the first state parameter value of the first switch based on the first parameter information.

[0129] S302. Determine the second state parameter value of the bypass switch based on the second parameter information.

[0130] S303. Determine the third state parameter value of the second busbar based on the third parameter information.

[0131] S701. When all the first state parameter values ​​are 0, the second state parameter values ​​are compared with the first preset condition to generate a first comparison result.

[0132] Specifically, the first state parameter value is checked. If all first state parameter values ​​are 0, it can be confirmed that the first busbar of the power substation is not supplying power to the single-line power supply substation. Then, the second state parameter value is compared with the first preset condition to obtain the first comparison result. The first preset condition is the state value of the bypass switch's disconnector position. When the state value of the bypass switch's disconnector position is 1, the second state parameter is 1. When the state value of the bypass switch's disconnector position is 0, the second state parameter is 0.

[0133] S702. Based on the first comparison result, the third state parameter value is compared with the second preset condition to generate a second comparison result.

[0134] When the first comparison result indicates that the second state parameter is 1, the third state parameter value is compared with the second preset condition to obtain the second comparison result. The second preset condition is the state value of the telemetry value of the line voltage of the second bus. When the state value of the telemetry value of the line voltage of the second bus is 1, the third state parameter is 1. When the state value of the telemetry value of the line voltage of the second bus is 0, the third state parameter is 0.

[0135] S703. Determine the voltage status of the single-line power supply substation based on the first comparison result and the second comparison result.

[0136] Specifically, the voltage status of a single-line power supply substation can be determined based on the values ​​of the second and third state parameters.

[0137] S104. Based on the voltage status of the single-line power supply substation, output the undervoltage alarm signal of the single-line power supply substation.

[0138] Optional, Figure 9 This is a flowchart illustrating another voltage detection method for a single-line power supply substation provided in this embodiment of the invention. Based on the above embodiments, see... Figure 9 Voltage detection methods for single-line power supply substations include:

[0139] S101. Obtain the parameter information of the power substation.

[0140] S301. Determine the first state parameter value of the first switch based on the first parameter information.

[0141] S302. Determine the second state parameter value of the bypass switch based on the second parameter information.

[0142] S303. Determine the third state parameter value of the second busbar based on the third parameter information.

[0143] S701. When all the first state parameter values ​​are 0, the second state parameter values ​​are compared with the first preset condition to generate a first comparison result.

[0144] S702. Based on the first comparison result, the third state parameter value is compared with the second preset condition to generate a second comparison result.

[0145] S801. When the second state parameter is 0, the voltage state of the single-line power supply substation is determined to be undervoltage.

[0146] Specifically, when the second state parameter is 0, the bypass switch is in the open position, meaning the second busbar is not supplying power to the single-line power supply substation, and the voltage status of the single-line power supply substation is determined to be undervoltage.

[0147] S802. When the second state parameter is 1 and the third state parameter is 0, the voltage state of the single-line power supply substation is determined to be undervoltage.

[0148] Specifically, when the second state parameter is 1 and the third state parameter is 0, although the bypass switch is in the closed position, the voltage of the second busbar does not reach the threshold for supplying power to the single-line power supply substation, so the voltage state of the single-line power supply substation is determined to be undervoltage.

[0149] S803. When the second state parameter is 1 and the third state parameter is 1, the voltage state of the single-line power supply substation is determined to be a voltage-enabled state.

[0150] Specifically, when the second state parameter is 1 and the third state parameter is 1, the disconnector position of the bypass switch is closed, and the voltage of the second bus reaches the threshold for supplying power to the single-line power supply substation, it can be determined that the voltage state of the single-line power supply substation is a voltage-enabled state.

[0151] S104. Based on the voltage status of the single-line power supply substation, output the undervoltage alarm signal of the single-line power supply substation.

[0152] Optional, Figure 10 This is a flowchart illustrating another voltage detection method for a single-line power supply substation provided in this embodiment of the invention. Based on the above embodiments, see... Figure 10 Voltage detection methods for single-line power supply substations include:

[0153] S101. Obtain the parameter information of the power substation.

[0154] S301. Determine the first state parameter value of the first switch based on the first parameter information.

[0155] S302. Determine the second state parameter value of the bypass switch based on the second parameter information.

[0156] S303. Determine the third state parameter value of the second busbar based on the third parameter information.

[0157] S701. When all the first state parameter values ​​are 0, the second state parameter values ​​are compared with the first preset condition to generate a first comparison result.

[0158] S702. Based on the first comparison result, the third state parameter value is compared with the second preset condition to generate a second comparison result.

[0159] S801. When the second state parameter is 0, the voltage state of the single-line power supply substation is determined to be undervoltage.

[0160] S802. When the second state parameter is 1 and the third state parameter is 0, the voltage state of the single-line power supply substation is determined to be undervoltage.

[0161] S803. When the second state parameter is 1 and the third state parameter is 1, the voltage state of the single-line power supply substation is determined to be a voltage-enabled state.

[0162] S901. When the voltage status of the single-line power supply substation is undervoltage, output the undervoltage alarm signal of the single-line power supply substation.

[0163] Specifically, if a single-line power supply substation is in an undervoltage state, it will issue a voltage loss alarm signal.

[0164] Another alternative implementation method, Figure 11 This is a logic diagram of a voltage detection method for a single-line power supply substation provided in an embodiment of the present invention. Based on the above embodiment, see... Figure 11 The voltage detection method for a single-line power supply substation provided in this embodiment includes:

[0165] S1, Begin.

[0166] S2. Determine p1, p2, p3, p4, p5.

[0167] S3. Determine if p1 = 0, p2 = 0, p3 = 0. If yes, execute S4; otherwise, execute S7.

[0168] S4. Determine if p4 = 0. If yes, execute S6; otherwise, execute S5.

[0169] S5. Determine if p5 = 0. If yes, proceed to S6; otherwise, proceed to S7.

[0170] S7, End.

[0171] Wherein, p1 is the state value of the first switch position, p2 is the state value of the active power of the first switch, p3 is the state value of the A-phase current of the first switch, p4 is the state value of the disconnector position of the bypass switch, and p5 is the state value of the line voltage of the second bus.

[0172] Optional, Figure 12 This is a schematic diagram of the structure of a voltage detection device for a single-line power supply substation provided in an embodiment of the present invention. Based on the above embodiment, see... Figure 12 The voltage detection device 100 for a single-line power supply substation provided in this embodiment of the invention is applied to a power system. The power system also includes power supply substations and single-line power supply substations. The voltage detection device 100 for a single-line power supply substation is used to execute a voltage detection method for a single-line power supply substation, including:

[0173] Acquisition module 11 is used to acquire parameter information of the power substation;

[0174] The status parameter determination module 12 is used to determine the status parameter values ​​of the power substation based on the parameter information.

[0175] Voltage status calculation module 13 is used to determine the voltage status of a single-line power supply substation based on the status parameter values ​​of the power supply substation.

[0176] The alarm control module 14 is used to output a voltage undervoltage alarm signal for the single-line power supply substation based on the voltage status of the single-line power supply substation.

[0177] Optionally, the acquisition module 11 is specifically used to acquire the first parameter information of the first switch of the power substation, the second parameter information of the bypass switch, and the third parameter information of the second busbar.

[0178] Optionally, the state parameter determination module 12 is specifically used to determine the first state parameter value of the first switch based on the first parameter information; determine the second state parameter value of the bypass switch based on the second parameter information; and determine the third state parameter value of the second bus based on the third parameter information.

[0179] Optionally, the voltage status calculation module 13 is specifically used to determine that the voltage status of the single-line power supply substation is undervoltage when the second status parameter is 0; to determine that the voltage status of the single-line power supply substation is undervoltage when the second status parameter is 1 and the third status parameter is 0; and to determine that the voltage status of the single-line power supply substation is voltage when the second status parameter is 1 and the third status parameter is 1.

[0180] Optionally, the alarm control module 14 is specifically used to output a voltage failure alarm signal for the single-line power supply substation when the voltage status of the single-line power supply substation is undervoltage.

[0181] The voltage detection device for a single-line power supply substation provided in this embodiment of the invention includes an acquisition module, a status parameter determination module, a voltage status calculation module, and an alarm control module. The acquisition module acquires first parameter information of the first switch, second parameter information of the bypass switch, and third parameter information of the second busbar of the power supply substation. The status parameter determination module determines the first status parameter value of the first switch, the second status parameter value of the bypass switch, and the third status parameter value of the second busbar based on the parameter information. The voltage status calculation module determines the voltage status of the single-line power supply substation based on the status parameter values ​​of the power supply substation. If the voltage status calculation module determines that the single-line power supply substation is in an undervoltage state, the alarm control module outputs a voltage loss alarm signal for the single-line power supply substation. This achieves accurate determination of whether a single-line power supply substation is undervoltage, preventing false voltage loss alarms from being issued during power supply via the bypass busbar and during related scheduling operations of a single-line, single-transformer substation.

[0182] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0183] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A voltage detection method for a single-line power supply substation, characterized in that, The voltage detection method for a single-line power supply substation is applied to a power system, which includes a voltage detection device for a single-line power supply substation, a power supply substation, and a single-line power supply substation. The voltage detection method of the single-line power supply substation is executed by the voltage detection device of the single-line power supply substation; The method includes: Obtain the parameter information of the power substation; Based on the parameter information, determine the status parameter values ​​of the power substation; Based on the state parameter values ​​of the power supply substation, determine the voltage status of the single-line power supply substation; Based on the voltage status of the single-line power supply substation, output the undervoltage alarm signal of the single-line power supply substation; The power substation includes a first busbar and a second busbar. The first busbar supplies power to the single-line power supply substation through a first switch, and the second busbar supplies power to the single-line power supply substation through a bypass switch. The single-line power supply substation includes a third busbar and a second switch. The third busbar is connected to the power transmission line of the power substation through the second switch. The acquisition of parameter information of the power substation includes: Obtain the first parameter information of the first switch of the power substation, wherein the first parameter information includes at least the switch position, active power and A-phase current value; Obtain the second parameter information of the bypass switch of the power substation, the second parameter information including the position of the disconnect switch; Obtain the third parameter information of the second busbar of the power substation, the third parameter information including the line voltage telemetry value; The step of determining the state parameter values ​​of the power substation based on the parameter information includes: Based on the first parameter information, determine the first state parameter value of the first switch; Based on the second parameter information, determine the second state parameter value of the bypass switch; Based on the third parameter information, determine the third state parameter value of the second busbar; The state parameter values ​​include a first state parameter value, a second state parameter value, and a third state parameter value.

2. The method according to claim 1, characterized in that, Determining the first state parameter value of the first switch based on the first parameter information includes: When the first switch is closed, the state value of the switch position is 1; when the first switch is open, the state value of the switch position is 0. When the active power is greater than the preset power threshold, the active power state value of the first switch is 1; when the active power of the first switch is less than or equal to the preset power threshold, the active power state value of the first switch is 0. When the current value of phase A of the first switch is greater than the preset current threshold, the state value of the current of phase A of the first switch is 1; when the current value of phase A of the first switch is less than or equal to the preset current threshold, the state value of the current of phase A of the first switch is 0.

3. The method according to claim 1, characterized in that, Determining the second state parameter value of the bypass switch based on the second parameter information includes: When the bypass switch's disconnector is closed, the state value of the bypass switch's disconnector position is 1; when the bypass switch's disconnector is open, the state value of the bypass switch's disconnector position is 0.

4. The method according to claim 1, characterized in that, Determining the third state parameter value of the second busbar based on the third parameter information includes: When the telemetry value of the line voltage of the second bus is greater than the preset voltage threshold, the state value of the line voltage of the second bus is 1; when the telemetry value of the line voltage of the second bus is less than or equal to the preset voltage threshold, the state value of the line voltage of the second bus is 0.

5. The method according to claim 1, characterized in that, Determining the voltage status of a single-line power supply substation based on the status parameter values ​​of the power substation includes: When all the first state parameter values ​​are 0, the second state parameter values ​​are compared with the first preset condition to generate a first comparison result; Based on the first comparison result, the third state parameter value is compared with the second preset condition to generate a second comparison result; Based on the first comparison result and the second comparison result, the voltage status of the single-line power supply substation is determined.

6. The method according to claim 5, characterized in that, Determining the voltage status of a single-line power supply substation based on the first comparison result and the second comparison result includes: When the second state parameter is 0, the voltage state of the single-line power supply substation is determined to be undervoltage. When the second state parameter is 1 and the third state parameter is 0, the voltage state of the single-line power supply substation is determined to be undervoltage. When the second state parameter is 1 and the third state parameter is 1, the voltage state of the single-line power supply substation is determined to be a voltage-enabled state.

7. The method according to claim 6, characterized in that, The step of outputting a voltage undervoltage alarm signal for the single-line power supply substation based on its voltage status includes: When the voltage status of the single-line power supply substation is undervoltage, an undervoltage alarm signal for the single-line power supply substation is output.

8. A voltage detection device for a single-line power supply substation, characterized in that, The voltage detection device for a single-line power supply substation is applied to a power system, which further includes power supply substations and single-line power supply substations; the voltage detection device for the single-line power supply substation is used to perform the voltage detection method for the single-line power supply substation as described in any one of claims 1 to 7; The voltage detection device for the single-line power supply substation includes: The acquisition module is used to acquire parameter information of the power substation; The status parameter determination module is used to determine the status parameter values ​​of the power substation based on the parameter information. The voltage status calculation module is used to determine the voltage status of a single-line power supply substation based on the status parameter values ​​of the power supply substation. The alarm control module is used to output a voltage undervoltage alarm signal for the single-line power supply substation based on the voltage status of the single-line power supply substation. The power substation includes a first busbar and a second busbar. The first busbar supplies power to the single-line power supply substation via a first switch, and the second busbar supplies power to the single-line power supply substation via a bypass switch. The single-line power supply substation includes a third busbar and a second switch. The third busbar is connected to the power substation's transmission line via the second switch. The acquisition module is specifically used to acquire first parameter information of the first switch of the power substation, which includes at least the switch position, active power, and A-phase current value; acquire second parameter information of the bypass switch of the power substation, which includes the disconnector position; and acquire third parameter information of the second busbar of the power substation, which includes the line voltage telemetry value. Specifically, the state parameter determination module is used to determine the first state parameter value of the first switch based on the first parameter information; determine the second state parameter value of the bypass switch based on the second parameter information; and determine the third state parameter value of the second bus based on the third parameter information; wherein the state parameter value includes the first state parameter value, the second state parameter value, and the third state parameter value.

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