A main transformer section switching method and device for a substation
By obtaining the operating parameters of the substation and calculating the main transformer section, automatic switching of the main transformer section of the substation is achieved, safety hazards caused by manual activation errors are solved, and the safety and stability of the power grid is improved.
Patent Information
- Application Number
- CN202111535556.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2021-12-15
- Publication Date
- 2025-06-10
- Estimated Expiration
- 2041-12-15
AI Technical Summary
In a substation, when the transformer is powered out or the operation mode is changed, there are safety hazards in the sections of the manually activated transformer, which may cause the main transformer section to exceed the limit, and in severe cases, damage the equipment, threatening the safe and stable operation of the power grid.
By obtaining the operating parameters of the substation, determining the operating status of the main transformer based on the operating parameters, and calculating the main transformer section of the normal main transformer parallel operation based on the operating status, automatic switching of the main transformer section is realized.
It reduces cross-sectional problems caused by manual transformer activation errors, improves the safety of the main transformer operation of the substation, and ensures the switching accuracy of the main transformer section.
Smart Images
Figure CN114221430B_ABST
Abstract
Description
Technical Field
[0001] The embodiments of the present invention relate to the technical field of power system substation operation, and in particular, to a main transformer section switching method and device for a substation. Background Art
[0002] A substation is a power facility in the power grid for transforming voltage, receiving and distributing electric energy, controlling the flow direction of electric power, and adjusting voltage. With the rapid development of local economy, the load of power grids in many regions has increased rapidly. To ensure the safety and reliability of power supply, generally two or three transformers are installed, and many power grids adopt the operation mode of parallel operation of 220 kV transformers.
[0003] For the power outage of a transformer or the change of the operation mode, when the main transformer section changes, if the correct section is not enabled and the abnormal situation of the power grid is not monitored, in the event of an accident, it will cause the transformer to be overloaded, and in severe cases, the equipment will be damaged, threatening the safe and stable operation of the power grid.
[0004] At present, when the power outage of a transformer or the change of the operation mode occurs, to ensure that the load of the substation does not overload in the event of an accident, the section will be set according to the overload capacity of the substation. If the substation fails and the power outage or the operation mode changes, it is necessary to reset the substation section. Manually enabling the section of the transformer has potential safety hazards. If the section is not enabled or the section calculation is incorrect, and the overlimit of the transformer section is not detected in time, when a certain transformer is removed due to a fault or other reasons, the load will be all transferred to the other transformer. At this time, the remaining operating transformer may be severely overloaded, seriously endangering the safety of the equipment. Summary of the Invention
[0005] The present invention provides a main transformer section switching method and device for a substation, so as to realize that the main transformer section can be automatically calculated and switched based on the operation mode, reduce the incorrect section enabled for the transformer manually, and improve the operation safety of the main transformer of the substation.
[0006] In a first aspect, the embodiments of the present invention provide a main transformer section switching method for a substation. The main transformer section switching method for the substation includes: obtaining the operation parameters of the substation; determining the operation state of the main transformer according to the operation parameters; wherein, the operation state includes the parallel operation state of normal main transformers; calculating the main transformer section of the parallel operation of normal main transformers according to the operation state, and switching it to the main transformer section of the substation.
[0007] Optionally, determining the operation state of the main transformer according to the operation parameters includes: determining the normally operating main transformers in the substation according to the operation parameters as normal main transformers; determining the parallel operation state between the normal main transformers according to the bus coupler switch state of the normal main transformers.
[0008] Optionally, determine the parallel operation status between normal main transformers according to the status of the bus coupler switch of the normal main transformer, including: if the bus coupler switch of the high-voltage side bus of the normal main transformer is in the operating state, and the bus coupler switch of the medium-voltage side bus of the normal main transformer is in the operating state, then the normal main transformers are in the parallel operation state; if the bus coupler switch of the high-voltage side bus of the normal main transformer is in the operating state, and the bus coupler switch of the medium-voltage side bus of the normal main transformer is in the standby state, then the normal main transformers on the same medium-voltage side bus are in the parallel operation state; if the bus coupler switch of the high-voltage side bus of the normal main transformer is in the standby state, and the bus coupler switch of the medium-voltage side bus of the normal main transformer is in the standby state, then the normal main transformers on the same high-voltage side bus and on the same medium-voltage side bus are in the parallel operation state.
[0009] Optionally, if the bus coupler switch of the high-voltage side bus of the normal main transformer is in the standby state, and the bus coupler switch of the medium-voltage side bus of the normal main transformer is in the operating state, then a warning signal is issued.
[0010] Optionally, calculate the main transformer section of the parallel operation of the normal main transformer according to the operating state, including: obtain the first section of the normal main transformers operating in parallel on the same high-voltage side bus, the second section of the normal main transformers operating in parallel on the same medium-voltage side bus, and the third section when the main transformer side switch of the normal main transformer is disconnected; select the minimum value among the first section, the second section, and the third section as the main transformer section of the parallel operation of the normal main transformer.
[0011] Optionally, obtain the first section of the normal main transformers operating in parallel on the same high-voltage side bus, including: disconnect the bus coupler switches on different high-voltage side buses respectively, and obtain the sections of the normal main transformers on different high-voltage side buses respectively as the first section.
[0012] Optionally, obtain the second section of the normal main transformers operating in parallel on the same medium-voltage side bus, including: disconnect the bus coupler switches on different medium-voltage side buses respectively, and obtain the sections of the normal main transformers on different medium-voltage side buses respectively as the second section.
[0013] Optionally, obtain the operating parameters of the substation, including: obtain the telemetry parameters and telecontrol signal parameters of the substation.
[0014] In a second aspect, an embodiment of the present invention further provides a main transformer section switching device for a substation, including: an acquisition module for acquiring the operating parameters of the substation; a determination module for determining the operating state of the main transformer according to the operating parameters, where the operating state includes the parallel operation state of the normal main transformer; and a switching module for calculating the main transformer section of the parallel operation of the normal main transformer according to the operating state and switching to the main transformer section of the substation.
[0015] Optionally, the determination module includes: a normal main transformer determination unit configured to determine a normally operating main transformer in the substation based on the operating parameters as the normal main transformer; and a parallel operation state determination unit configured to determine the parallel operation state between the normal main transformers based on the bus coupler switch state of the normal main transformers.
[0016] The main transformer section switching method for a substation provided by the embodiment of the present invention obtains the operating parameters of the substation, determines the operating state of the main transformer according to the operating parameters, then calculates the main transformer section for parallel operation of the normal main transformers based on the operating state, and switches it to the main transformer section of the substation. The technical solution provided by the embodiment of the present invention can calculate the load when the normal main transformers are operating in parallel according to the current operating state of the main transformer, and use it as the current main transformer section of the substation, and switch the main transformer section of the substation to the current main transformer section, so that the main transformer section can be automatically switched in a timely manner according to the current operating state of the main transformer, reducing the situation of main transformer section over-limit when the operating mode of the substation changes, and at the same time avoiding manual switching of the main transformer section, ensuring the accuracy of the main transformer section switching, and improving the operation safety of the main transformer in the substation. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a flowchart of a main transformer section switching method for a substation provided in Embodiment 1 of the present invention;
[0018] Figure 2 It is a wiring circuit diagram of a typical 220KV substation provided in Embodiment 1 of the present invention;
[0019] Figure 3 It is a flowchart of a main transformer section switching method for a substation provided in Embodiment 2 of the present invention;
[0020] Figure 4 It is a flowchart of determining the parallel operation state between normal main transformers provided in Embodiment 2 of the present invention;
[0021] Figure 5 It is a flowchart of a main transformer section switching method for a substation provided in Embodiment 3 of the present invention;
[0022] Figure 6 It is a structural block diagram of a main transformer section switching device for a substation provided in Embodiment 4 of the present invention;
[0023] Figure 7 It is another structural block diagram of a main transformer section switching device for a substation provided in Embodiment 4 of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the sake of description, only the parts related to the present invention rather than all the structures are shown in the drawings.
[0025] Embodiment 1
[0026] Figure 1 FIG. is a flowchart of a main transformer section switching method for a substation provided in Embodiment 1 of the present invention. This embodiment is applicable to the situation of calculating the main transformer section of a substation. This method can be executed by the main transformer section switching device of the substation, and specifically includes the following steps:
[0027] S110. Obtain the operating parameters of the substation;
[0028] Among them, the substation may include multiple transformers, and each transformer can be used as a main transformer. During the operation of the substation, under normal circumstances, multiple main transformers can operate in parallel to ensure the operation reliability of the substation. Exemplarily, in a 220KV substation, the transformer can be a three-winding main transformer. By setting the connection relationship between the high-voltage side and the medium-voltage side busbars of the main transformer, and the connection relationship between the medium-voltage side and the medium-voltage side busbars of the main transformer, the parallel operation between different main transformers can be set. In the substation, the operating parameters can be parameters used to characterize the operating state of the main transformers in the substation. Exemplarily, the operating parameters can include the state parameters of the high-voltage side switch, high-voltage side busbar switch, medium-voltage side switch of the main transformer, and the switch of the medium-voltage side busbar to determine the operating state of the main transformer.
[0029] S120. Determine the operating state of the main transformer according to the operating parameters; among them, the operating state includes the parallel operation state of normal main transformers;
[0030] Among them, the operating parameters include the state parameters of the high-voltage side switch, high-voltage side busbar switch, medium-voltage side switch of each main transformer, and the switch of the medium-voltage side busbar. After obtaining the operating parameters, it can be determined whether the main transformer is in a normal operating state according to the closed or open state of each switch, and on the basis that at least two main transformers are in a normal operating state, it is determined whether at least two normally operating main transformers are in a parallel operation state. When the main transformer is in a normal operating state, the main transformer can carry the load normally. When at least two normally operating main transformers are in a parallel operation state, all of the at least two normally operating main transformers in parallel operation can carry the load, and the overall total load is the sum of the loads of the at least two normally operating main transformers in parallel operation. Thus, the load of the substation can be determined according to the normal operating state and parallel operation state of the main transformer.
[0031] Exemplarily, Figure 2 is a wiring circuit diagram of a typical 220KV substation provided in Embodiment 1 of the present invention. Combined withFigure 1 and Figure 2 , the substation includes three main transformers, namely the first main transformer #1 main transformer, the second main transformer #2 main transformer, and the third main transformer #3 main transformer. It is set that the capacity of the first main transformer #1 main transformer is A, and the overload capacity of the first main transformer #1 main transformer is x times the capacity of the main transformer. The capacity of the second main transformer #2 main transformer is B, and the overload capacity of the second main transformer #2 main transformer is y times the capacity of the main transformer. The capacity of the third main transformer #3 main transformer is C, and the overload capacity of the third main transformer #3 main transformer is z times the capacity of the main transformer. According to the operating parameters, it can be determined that the first main transformer #1 main transformer, the second main transformer #2 main transformer, and the third main transformer #3 main transformer are operating normally, and the first main transformer #1 main transformer, the second main transformer #2 main transformer, and the third main transformer #3 main transformer can carry the load normally. Then the main transformer section value is A×x + B×y + C×z, and the first main transformer #1 main transformer, the second main transformer #2 main transformer, and the third main transformer #3 main transformer can carry the load normally. If the first main transformer #1 main transformer is removed, the load will be transferred entirely to the second main transformer #2 main transformer and the third main transformer #3 main transformer. At this time, the main transformer section value is B×y + C×z. Similarly, if the second main transformer #2 main transformer is removed, by analogy, the main transformer section value at this time is A×x + C×z.
[0032] S130. Calculate the main transformer section of normal main transformers operating in parallel according to the operating state and switch it to the main transformer section of the substation.
[0033] Among them, the section mainly refers to the number of power transmission channels when the cross-regional power grid supplies power and the limits of their respective and total transmission capabilities. The main transformer section of the substation is the limit of the transmission capabilities of the transformers that can supply the load, either individually or in total. The main transformer section value is the sum of the capacities of all the remaining operating main transformers multiplied by their overload capacities. When the substation is operating normally, the main transformer section of the substation is the sum of the loads of each main transformer. After the operating mode of the substation changes, the load of normal main transformers operating in parallel can be calculated according to the current operating state of the main transformers and used as the current main transformer section of the substation. The main transformer section of the substation is switched to the current main transformer section, so that the main transformer section can be automatically switched in a timely manner according to the current operating state of the main transformers, reducing the situation of the main transformer section exceeding the limit when the operating mode of the substation changes. At the same time, it avoids manual switching of the main transformer section, ensures the accuracy of the main transformer section switching, and improves the operation safety of the main transformers in the substation.
[0034] The main transformer section switching method for a substation provided by an embodiment of the present invention obtains the operating parameters of the substation, determines the operating state of the main transformer according to the operating parameters, and then calculates the main transformer section for normal parallel operation of the main transformers according to the operating state and switches it to the main transformer section of the substation. The technical solution provided by the embodiment of the present invention can calculate the load during normal parallel operation of the main transformers according to the current operating state of the main transformers, and use it as the current main transformer section of the substation, and switch the main transformer section of the substation to the current main transformer section, so that the main transformer section can be automatically switched in a timely manner according to the current operating state of the main transformers, reducing the situation of over-limiting of the main transformer section when the operating mode of the substation changes. At the same time, manual switching of the main transformer section is avoided, ensuring the accuracy of the switching of the main transformer section and improving the operating safety of the main transformers in the substation.
[0035] Embodiment 2
[0036] Optionally, Figure 3 is a flowchart of a main transformer section switching method for a substation provided by Embodiment 2 of the present invention. Refer to Figure 3 , the technical solution of this embodiment further refines the step of determining the operating state of the main transformer on the basis of Embodiment 1. The operating state of the main transformer is determined according to the operating parameters. The method includes the following steps:
[0037] S110. Obtain the operating parameters of the substation;
[0038] S121. Determine the main transformers operating normally in the substation according to the operating parameters as the normal main transformers;
[0039] Specifically, the normal main transformers are the main transformers operating normally. When determining the state of the main transformer, the switch states on different sides of the main transformer can be used. Exemplarily, when the main transformer is a three-winding main transformer, when the high-side switch and the medium-side switch of the main transformer are in the closed state, the parallel operation state between the normal main transformers is determined according to the state of the bus-tie switch of the normal main transformers. Exemplarily, for a three-winding main transformer, if the high-side switch and the medium-side switch of the main transformer are in operation, the parallel operation state is defined as the normal operation state; if only the high-side switch is in operation, the parallel operation state is defined as the high-side charging operation state; if only the medium-side switch is in operation, the parallel operation state is defined as the medium-side charging operation state.
[0040] S122. Determine the parallel operation state between the normal main transformers according to the state of the bus-tie switch of the normal main transformers.
[0041] Among them, the main transformer is connected to the bus through the bus-tie switch. Through the bus-tie switch between the main transformer and the bus, and the switches on different sides of the main transformer, the connection relationship between the main transformer and the bus can be determined, and then the parallel operation state between the main transformers can be determined.
[0042] Optionally, Figure 4The flowchart for determining the parallel operation status between normal main transformers provided in the second embodiment of the present invention is shown in Figure 4 , and determining the parallel operation status between normal main transformers according to the status of the bus coupler switch of the normal main transformer includes the following steps:
[0043] S1221. If the bus coupler switch of the high-voltage side bus of the normal main transformer is in the operating state and the bus coupler switch of the medium-voltage side bus of the normal main transformer is in the operating state, then the normal main transformers are in the parallel operation state;
[0044] Among them, when the operating state of the bus coupler switch is that the equipment is energized, the bus coupler switch, the bus-side disconnector and the main-transformer-side disconnector are all in the closed position. If the bus coupler switch of the high-voltage side bus of the normal main transformer is in the operating state and the bus coupler switch of the medium-voltage side bus of the normal main transformer is in the operating state, at this time, the bus coupler switch, the bus-side disconnector and the main-transformer-side disconnector are all in the closed position, and the main transformer operates normally. At this time, the normal main transformers are in the parallel operation state.
[0045] S1222. If the bus coupler switch of the high-voltage side bus of the normal main transformer is in the operating state and the bus coupler switch of the medium-voltage side bus of the normal main transformer is in the standby state, then the normal main transformers on the same medium-voltage side bus are in the parallel operation state;
[0046] Among them, the standby state can include the hot standby state or the cold standby state. The hot standby state can be that the bus coupler switch is in the open position, and the bus-side disconnector and the main-transformer-side disconnector are in the closed position. The cold standby state is that the bus coupler switch is in the open position, and the bus-side disconnector and the main-transformer-side disconnector are in the open position. The same medium-voltage side bus can be the line connecting the main transformer and the medium-voltage bus.
[0047] Specifically, if the bus coupler switch of the high-voltage side bus of the normal main transformer is in the operating state and the bus coupler switch of the medium-voltage side bus of the normal main transformer is in the hot standby state, then the normal main transformers on the same medium-voltage side bus are in the parallel operation state. If the bus coupler switch of the high-voltage side bus of the normal main transformer is in the operating state and the bus coupler switch of the medium-voltage side bus of the normal main transformer is in the cold standby state, then the normal main transformers on the same medium-voltage side bus are in the parallel operation state.
[0048] S1223. If the bus coupler switch of the high-voltage side bus of the normal main transformer is in the standby state and the bus coupler switch of the medium-voltage side bus of the normal main transformer is in the standby state, then the normal main transformers on the same high-voltage side bus and on the same medium-voltage side bus are in the parallel operation state.
[0049] Among them, the same high-voltage side bus can be the line connecting the main transformer and the high-voltage bus.
[0050] Specifically, if the bus-tie switch of the high-voltage side bus of the normal main transformer is in the hot standby state and the bus-tie switch of the medium-voltage side bus of the normal main transformer is in the hot standby state, then the normal main transformers on the same high-voltage side bus and on the same medium-voltage side bus are in the parallel operation state. If the bus-tie switch of the high-voltage side bus of the normal main transformer is in the hot standby state and the bus-tie switch of the medium-voltage side bus of the normal main transformer is in the cold standby state, then the normal main transformers on the same high-voltage side bus and on the same medium-voltage side bus are in the parallel operation state. If the bus-tie switch of the high-voltage side bus of the normal main transformer is in the cold standby state and the bus-tie switch of the medium-voltage side bus of the normal main transformer is in the hot standby state, then the normal main transformers on the same high-voltage side bus and on the same medium-voltage side bus are in the parallel operation state. If the bus-tie switch of the high-voltage side bus of the normal main transformer is in the cold standby state and the bus-tie switch of the medium-voltage side bus of the normal main transformer is in the cold standby state, then the normal main transformers on the same high-voltage side bus and on the same medium-voltage side bus are in the parallel operation state.
[0051] The bus-tie switch controls the grid connection or disconnection of two buses. During the grid connection operation of the buses, when a fault occurs in one of the buses and its line, the protection action promptly separates the bus-tie switch, which can ensure the normal power supply of the other bus and reduce the power outage range. During the switching operation, the bus-tie switch is closed for an equipotential power-off operation. When a fault occurs in the line circuit breaker, the line where the faulty circuit breaker is located can be connected to an empty bus, and the bus-tie switch replaces the line switch for operation.
[0052] S130. Calculate the main transformer section for the parallel operation of the normal main transformers according to the operating state and switch to the main transformer section of the substation.
[0053] Optionally, if the bus-tie switch of the high-voltage side bus of the normal main transformer is in the standby state and the bus-tie switch of the medium-voltage side bus of the normal main transformer is in the operating state, a warning signal is issued.
[0054] Among them, if the bus-tie switch of the high-voltage side bus of the normal main transformer is in the hot standby state and the bus-tie switch of the medium-voltage side bus of the normal main transformer is in the operating state, and at this time the main transformer section value is greater than or equal to the preset threshold of the main transformer, a warning signal is issued. If the bus-tie switch of the high-voltage side bus of the normal main transformer is in the cold standby state and the bus-tie switch of the medium-voltage side bus of the normal main transformer is in the operating state, and at this time the main transformer section value is greater than or equal to the preset threshold of the main transformer, a warning signal is issued.
[0055] Embodiment III
[0056] Optionally, Figure 5 is a flowchart of a method for switching the main transformer section of a substation provided in Embodiment III of the present invention. Refer to Figure 5 , the technical solution of this embodiment further refines the step of determining the operating state of the main transformer on the basis of Embodiment I, calculates the main transformer section for the parallel operation of the normal main transformers according to the operating state, and the method includes the following steps:
[0057] S110. Obtain the operation parameters of the substation;
[0058] S120. Determine the operation state of the main transformer according to the operation parameters; wherein, the operation state includes the parallel operation state of normal main transformers;
[0059] S131. Obtain the first section of the normal main transformers operating in parallel on the same high-voltage side bus, the second section of the normal main transformers operating in parallel on the same medium-voltage side bus, and the third section when the main transformer side switch of the normal main transformer is disconnected;
[0060] Specifically, when a certain main transformer is removed, the main transformers on the same high-voltage side bus operate in parallel, the main transformers on the same medium-voltage side bus operate in parallel, the main transformer side switch of the normal main transformer is disconnected, and the main transformer section value is the sum of the capacities of all the remaining operating main transformers multiplied by the overload capacity. The section value of the normal main transformers operating in parallel on the same high-voltage side bus obtained is the first section, the section value of the normal main transformers operating in parallel on the same medium-voltage side bus obtained is the second section, and the section value when the main transformer side switch of the normal main transformer is disconnected is the third section.
[0061] Optionally, obtaining the first section of the normal main transformers operating in parallel on the same high-voltage side bus includes: disconnecting the bus coupler switches on different high-voltage side buses respectively, and obtaining the sections of the normal main transformers on different high-voltage side buses respectively as the first section.
[0062] Exemplarily, continue to refer to Figure 2 , disconnect the bus coupler switches on the high-voltage side buses respectively. For example, when disconnecting the 220 kV bus coupler switch on the 220 kV #1 bus, the main transformers on the other section of the bus will bear all the loads. At this time, the first section value is the sum of the capacities of the remaining operating main transformers multiplied by the overload capacity. When disconnecting the 220 kV bus coupler switch on the 220 kV #2 bus, the main transformers on the other section of the bus will bear all the loads. At this time, the first section value is the sum of the capacities of all the remaining operating main transformers multiplied by the overload capacity.
[0063] Optionally, obtaining the second section of the normal main transformers operating in parallel on the same medium-voltage side bus includes: disconnecting the bus coupler switches on different medium-voltage side buses respectively, and obtaining the sections of the normal main transformers on different medium-voltage side buses respectively as the second section.
[0064] Exemplarily, continue to refer to Figure 2, disconnect the bus tie switches on different buses on the variable middle side respectively. For example, when disconnecting the 110 kV bus tie switch on the 110 kV #1 bus, the main transformer on the other bus will bear all the loads. At this time, the first section value is the sum of the capacities of the remaining operating main transformers multiplied by the overload capacity. When disconnecting the 110 kV bus tie switch on the 110 kV #2 bus, the main transformer on the other bus will bear all the loads. At this time, the section value is the sum of the capacities of the remaining operating main transformers multiplied by the overload capacity.
[0065] S132. Select the minimum value among the first section, the second section and the third section as the main transformer section for normal parallel operation of the main transformers.
[0066] Specifically, disconnect the main transformer side switches of each main transformer respectively, then the third section is the sum of the capacities of the remaining operating main transformers multiplied by the overload capacity. It is necessary to ensure that not only the overall main transformer section is less than the preset threshold of the main transformer, but also each remaining main transformer section is less than the preset threshold of a single main transformer. Select the minimum value among the first section, the second section and the third section as the main transformer section for normal parallel operation of the main transformers. Selecting the minimum value among the first section, the second section and the third section can ensure that each remaining main transformer is less than the preset threshold of a single main transformer.
[0067] Optionally, obtain the operation parameters of the substation, including: obtaining the telemetry parameters and the tele-signal parameters of the substation.
[0068] Specifically, the telemetry parameter is the analog quantity measured by the transformer, which is a specific value. The tele-signal parameter is the switch state 1 or 0. For example, when the tele-signal parameter is the switch state 1, the switch state of the bus tie switch is the conducting state. When the tele-signal parameter is the switch state 0, the switch state of the bus tie switch is the disconnected state. Information such as the power, voltage and current of the substation can be obtained according to the telemetry parameters. The state parameters of the high-voltage side switch, the high-voltage side bus switch, the middle-voltage side switch and the middle-voltage side bus switch of the main transformer can be obtained through the tele-signal parameters, and then the operating state of the main transformer can be determined.
[0069] Embodiment 4
[0070] Embodiment 4 of the present invention provides a main transformer section switching device for a substation. Figure 6 For the structural block diagram of the main transformer section switching device for a substation provided in Embodiment 4 of the present invention, see Figure 6 , the main transformer section switching device for the substation includes: an acquisition module 110, configured to acquire the operation parameters of the substation; a determination module 120, configured to determine the operating state of the main transformer according to the operation parameters; wherein, the operating state includes the parallel operation state of the normal main transformers; a switching module 130, configured to calculate the main transformer section for normal parallel operation of the main transformers according to the operating state and switch to the main transformer section of the substation.
[0071] The above device can execute a main transformer section switching method provided by any embodiment of the present invention, and has function modules and beneficial effects corresponding to the execution of the method.
[0072] Optionally, Figure 7 This is a structural block diagram of another main transformer section switching device provided in the fourth embodiment of the present invention. Refer to Figure 7 , the determination module includes: a normal main transformer determination unit 121, configured to determine the main transformer operating normally in the substation according to the operating parameters as the normal main transformer; a parallel operation state determination unit 122, configured to determine the parallel operation state between the normal main transformers according to the bus coupler switch state of the normal main transformers.
[0073] Note that the above is only the preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.
Claims
1. A method for switching the main transformer section of a substation, characterized in that, it includes: Obtain the operating parameters of the substation; Determine the operating state of the main transformer according to the operating parameters; wherein, the operating state includes the parallel operating state of the normal main transformer; Calculate the main transformer section of the parallel operation of the normal main transformer according to the operating state, and switch it to the main transformer section of the substation; Calculating the main transformer section of the parallel operation of the normal main transformer according to the operating state includes: Obtain the first section of the normal main transformers operating in parallel on the same high-voltage side bus, the second section of the normal main transformers operating in parallel on the same medium-voltage side bus, and the third section when the main transformer side switches of the normal main transformers are opened; Select the minimum value among the first section, the second section, and the third section as the main transformer section of the parallel operation of the normal main transformer; Determining the operating state of the main transformer according to the operating parameters includes: Determine the normal main transformers operating normally in the substation according to the operating parameters as the normal main transformers; Determine the parallel operating state between the normal main transformers according to the bus coupler switch state of the normal main transformers; The bus coupler switch controls the parallel or separate operation of two buses.
2. The method for switching the main transformer section of a substation according to claim 1, characterized in that, Determining the parallel operating state between the normal main transformers according to the bus coupler switch state of the normal main transformers includes: If the bus coupler switch of the high-voltage side bus of the normal main transformer is in the operating state, and the bus coupler switch of the medium-voltage side bus of the normal main transformer is in the operating state, then the normal main transformers are in the parallel operating state; If the bus coupler switch of the high-voltage side bus of the normal main transformer is in the operating state, and the bus coupler switch of the medium-voltage side bus of the normal main transformer is in the standby state, then the normal main transformers on the same medium-voltage side bus are in the parallel operating state; If the bus coupler switch of the high-voltage side bus of the normal main transformer is in the standby state, and the bus coupler switch of the medium-voltage side bus of the normal main transformer is in the standby state, then the normal main transformers on the same high-voltage side bus and on the same medium-voltage side bus are in the parallel operating state.
3. The method for switching the main transformer section of a substation according to claim 2, characterized in that, If the bus coupler switch of the high-voltage side bus of the normal main transformer is in the standby state, and the bus coupler switch of the medium-voltage side bus of the normal main transformer is in the operating state, then a warning signal is issued.
4. The method for switching the main transformer section of a substation according to claim 1, characterized in that, Obtaining the first section of the normal main transformers operating in parallel on the same high-voltage side bus includes: Disconnect the bus coupler switches on different high-voltage side buses respectively, and obtain the sections of the normal main transformers on different high-voltage side buses respectively as the first section.
5. The method for switching the main transformer section of a substation according to claim 1, characterized in that, Obtaining the second section of the normal main transformers operating in parallel on the same medium-voltage side bus includes: Disconnect the bus coupler switches on different medium-voltage side buses respectively, and obtain the sections of the normal main transformers on different medium-voltage side buses respectively as the second section.
6. The method for switching the main transformer section of a substation according to claim 1, characterized in that, Obtain the operation parameters of the substation, including: Obtain the telemetry parameters and telecontrol signal parameters of the substation.
7. A main transformer section switching device for a substation Characterized in that Comprising: An acquisition module, configured to acquire the operation parameters of the substation; A determination module, configured to determine the operation state of the main transformer according to the operation parameters; wherein, the operation state includes the parallel operation state of the normal main transformer; A switching module, configured to calculate the main transformer section of the parallel operation of the normal main transformer according to the operation state, and switch to the main transformer section of the substation; Calculating the main transformer section of the parallel operation of the normal main transformer according to the operation state includes: Obtain the first section of the normal main transformers operating in parallel on the same bus on the high-voltage side of the transformer, the second section of the normal main transformers operating in parallel on the same bus on the medium-voltage side of the transformer, and the third section when the main transformer side switch of the normal main transformer is disconnected; Select the minimum value among the first section, the second section and the third section as the main transformer section of the parallel operation of the normal main transformer; The determination module includes: A normal main transformer determination unit, configured to determine the main transformer operating normally in the substation according to the operation parameters as the normal main transformer; A parallel operation state determination unit, configured to determine the parallel operation state between the normal main transformers according to the bus coupler switch state of the normal main transformer; The bus coupler switch controls the grid connection operation or the network separation operation of two buses.
Citation Information
Patent Citations
Grid section monitoring and transfer strategy intelligent generation system and method
CN107681780A