Control method, device and equipment of power supply system, medium, product and transformer substation

Abstract

The invention provides a control method and device of a power supply system, equipment, a medium, a product and a transformer substation. The power supply system comprises a main voltage transformation module, a standby voltage transformation module, a bus and a load connected to the bus, wherein the bus is provided with at least one section switch; the method comprises the following steps: receiving a mode instruction, wherein the mode instruction is used for indicating a standby mode or a grouping mode; if the mode instruction indicates the standby mode, the section switch is controlled to be switched on, the main transformer module is controlled to continuously run, and the standby transformer module is controlled to stop running; if the mode instruction indicates a grouping mode, controlling a section switch to be switched off so as to divide the bus into a plurality of bus sections; and grouping the main voltage transformation module and the standby voltage transformation module to obtain a voltage transformation group corresponding to each bus segment, and controlling the voltage transformation modules under the voltage transformation groups to operate continuously. According to the method provided by the invention, the load rate of the main transformer module is reduced, and the operation safety of equipment is improved.

Description

Technical Field

[0001] The present application relates to power supply system control technology, and in particular to a control method, device, equipment, medium, product and substation for a power supply system. Background Art

[0002] In the power supply system, a transformer is usually used to convert the input voltage and then provide it to the load. At present, according to the maximum demand of the load, multiple main transformers are usually used in parallel to supply power to the load. In order to improve the stability of the power supply system, a transformer can be used as a backup transformer. Under normal circumstances, it does not need to be put into operation. When a main transformer is out of use due to maintenance or other reasons, the backup transformer takes over the main transformer and runs in parallel with the remaining transformers to supply power to the load. This method has the problem of high load rate when the main transformer is running, and faces safety problems such as overload test. Summary of the invention

[0003] The present application provides a control method, device, equipment, medium, product and substation for a power supply system, which are used to solve the problem of safe operation when the main transformer has a high load rate during operation.

[0004] In a first aspect, the present application provides a control method for a power supply system, the power supply system comprising: a main transformer module, a standby transformer module, a bus and a load connected to the bus, wherein at least one section switch is provided on the bus; the control method comprises:

[0005] receiving a mode instruction, wherein the mode instruction is used to indicate a standby mode or a packet mode;

[0006] If the mode instruction indicates the standby mode, the segment switch is controlled to be turned on, and the main transformer module is controlled to continue to operate and the standby transformer module is controlled to stop operating; wherein the total rated capacity of the main transformer module is not less than the total maximum demand of the load;

[0007] If the mode instruction indicates a grouping mode, the section switch is controlled to be disconnected to divide the bus into multiple bus sections; and the main transformer module and the standby transformer module are grouped to obtain a transformer group corresponding to each bus section, and the transformer modules under the transformer group are controlled to operate continuously; wherein, the bus sections are connected to the transformer modules under the corresponding transformer groups, and the sum of the rated capacities of the transformer modules under each transformer group is not less than the sum of the maximum demands of the loads under the corresponding bus sections.

[0008] Optionally, the sectionalizing switch on the bus includes a first sectionalizing switch, the main transformer module includes a first transformer module, a second transformer module, and a third transformer module, and the standby transformer module includes a fourth transformer module; and the control method includes:

[0009] If the mode instruction indicates the standby mode, the first segment switch is controlled to be turned on, and the first transformer module, the second transformer module, and the third transformer module are controlled to continue to operate, and the fourth transformer module is controlled to stop operating; wherein the sum of the rated capacities of the first transformer module, the second transformer module, and the third transformer module is not less than the sum of the maximum demand of the load;

[0010] If the mode instruction indicates a grouping mode, the first section switch is controlled to be disconnected to divide the bus into a first bus section and a second bus section; and the first transformer module and the second transformer module are divided into a first transformer group, and the third transformer module and the fourth transformer module are divided into a second transformer group, and the first transformer module, the second transformer module, the third transformer module, and the fourth transformer module are controlled to operate continuously; wherein the sum of the rated capacities of the first transformer module and the second transformer module is not less than the sum of the maximum demand of the loads under the first bus section, and the sum of the rated capacities of the third transformer module and the fourth transformer module is not less than the sum of the maximum demand of the loads under the second bus section.

[0011] Optionally, the power supply system further includes: a current transformer and / or a voltage transformer connected to the transformer module; and the control method further includes:

[0012] Detecting whether an abnormality occurs in the transformer module according to the current value of the current transformer and / or the voltage value of the voltage transformer;

[0013] If any transformer module fails and the current mode is group mode, the current mode is switched to standby mode.

[0014] If any transformer module is abnormal and the current mode is the standby mode, the current mode is kept as the standby mode, and the transformer module with the abnormality is controlled to stop running, and the remaining transformer modules are controlled to continue running;

[0015] If the abnormal transformer module returns to normal and the current mode is the standby mode, the current mode is switched to the grouping mode.

[0016] Optionally, the control method further includes: detecting whether the transformer module is overloaded; when any transformer module is overloaded, cutting off the load connected to the bus connected to the transformer module or the bus segment according to the overload amount.

[0017] Optionally, the method further comprises: when it is detected that any transformer module is overloaded, locking the bus connected to the transformer module or other transformer modules connected to the bus segment.

[0018] Optionally, the step of removing the bus connected to the transformer module or the load connected to the bus segment according to the overload amount specifically includes:

[0019] According to the overload amount, in order of the load protection priority from low to high, the bus connected to the transformer module or the load connected to the bus segment is cut off.

[0020] In a second aspect, the present application provides a control device for a power supply system, the power supply system comprising: a main transformer module, a standby transformer module, a bus and a load connected to the bus, wherein at least one section switch is provided on the bus; the control device comprises:

[0021] A receiving module, used for receiving a mode instruction, wherein the mode instruction is used for indicating a standby mode or a grouping mode;

[0022] A control module, configured to control the section switch to be turned on, and control the main transformer module to continue to operate and control the standby transformer module to stop operating if the mode instruction indicates a standby mode; wherein the total rated capacity of the main transformer modules is not less than the total maximum demand of the loads;

[0023] The control module is also used to control the segment switch to be disconnected if the mode instruction indicates a grouping mode, so as to divide the bus into multiple bus segments; and to group the main transformer module and the standby transformer module to obtain a transformer group corresponding to each bus segment, and control the transformer modules under the transformer group to operate continuously; wherein the sum of the rated capacities of the transformer modules under each transformer group is not less than the sum of the maximum demands of the loads under the corresponding bus segment.

[0024] In a third aspect, the present application provides an electronic device, comprising: a processor, and a memory connected to the processor;

[0025] The memory stores computer-executable instructions;

[0026] The processor executes the computer-executable instructions stored in the memory to implement the method as described in any one of the first aspects.

[0027] In a fourth aspect, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, they are used to implement the method as described in any one of the first aspects.

[0028] In a fifth aspect, the present application provides a computer program product, including a computer program, which implements the method described in any one of the first aspects when executed by a processor.

[0029] In a sixth aspect, the present application provides a substation, including a power supply system, and the control device as described in the second aspect or the electronic device as described in the third aspect;

[0030] The power supply system comprises: a main transformer module, a standby transformer module, a bus bar and a load connected to the bus bar, wherein at least one section switch is arranged on the bus bar.

[0031] The control method, device, equipment, medium, product and substation of the power supply system provided in the present application set two operating modes for the power supply system: standby mode and group mode. In group mode, the main transformer module and the standby transformer module are divided into transformer groups, and the bus is divided into multiple bus segments. Each transformer group supplies power to the load connected to the bus segment through the corresponding bus segment, and the total rated capacity of the transformer group is not less than the sum of the maximum demand of the load connected to the corresponding bus segment. In this mode, the standby transformer module is used to work together with the main transformer module, and the standby transformer module shares the load of the main transformer module, thereby reducing the load rate of the main transformer module and improving the safety of equipment operation. In standby mode, the bus segments are connected to one bus, and the transformer modules of each group are combined into one group, and the transformer modules in normal operation are used to jointly supply power to the load connected to the bus. In this mode, when any of the main transformer modules or the backup transformer modules is shut down, the remaining normally operating transformer modules of the power supply system can share the load of the faulty transformer module and provide electrical energy to the load, so as to avoid the situation where the total rated capacity of the normally operating transformer modules in the faulty transformer group is insufficient to provide sufficient electrical energy for the corresponding load, thereby ensuring the normal power demand of the load. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0033] Figure 1 A schematic diagram of the structure of a first power supply system provided in an embodiment of the present application;

[0034] Figure 2 A schematic flow chart of a first power supply system control method provided in an embodiment of the present application;

[0035] Figure 3 A schematic diagram of the structure of a second power supply system provided in an embodiment of the present application;

[0036] Figure 4 A schematic flow chart of a second power supply system control method provided in an embodiment of the present application;

[0037] Figure 5A schematic diagram of the structure of a third power supply system provided in an embodiment of the present application;

[0038] Figure 6 A schematic diagram of the structure of a control device for a power supply system provided in an embodiment of the present application;

[0039] Figure 7 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application.

[0040] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0041] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0042] In the power supply system, a transformer is usually used to convert the input voltage and then provide it to the load. At present, according to the maximum demand of the load, multiple main transformers are usually used in parallel to supply power to the load. In order to improve the stability of the power supply system, another transformer can be used as a backup transformer. Under normal circumstances, it does not need to be put into operation. When a main transformer is out of use due to maintenance or other reasons, the backup transformer takes over the main transformer and runs in parallel with the remaining transformers to supply power to the load. This method has the problem of increased energy consumption when the main transformer is running at full load, and faces the problem of overload test and other safety operation.

[0043] Therefore, how to control the power supply system so as to provide sufficient power for the load and reduce the load rate of the transformer without adding a new transformer has become an urgent problem to be solved.

[0044] Figure 1 This is a schematic diagram of the structure of the first power supply system provided in the embodiment of the present application. Figure 1 As shown, the power supply system includes: a main transformer module, a standby transformer module, a bus and a load connected to the bus, wherein at least one section switch is arranged on the bus.

[0045] The main transformer module and the standby transformer module are any modules that can start or stop voltage conversion based on a control signal. The main transformer module and the standby transformer module can be, for example, any of the following transformers: a main transformer, a distribution transformer, etc., or any of the following: a unidirectional transformer, a three-phase transformer, etc., or any of the following: a single-winding transformer, a double-winding transformer, a three-winding transformer, etc. Optionally, in addition to the transformer, a communication interface may also be included, such as Ethernet, a serial communication protocol (RS-485), and a mobile hotspot (Wifi). The specific interface is subject to the interface supported by the hardware circuit of the transformer module, and the embodiment of the present application does not limit this.

[0046] The busbar can be any line that can collect and distribute electrical energy, and can be used to transmit electrical energy from one or more input sources to multiple output devices or loads. The embodiment of the present application is illustrated by taking the busbar collecting the electrical energy of the main transformer module and the backup transformer module and outputting it to the load as an example.

[0047] The sectionalizer can be, for example, any power switch that can be turned on or off based on a high-level signal / low-level signal. When the sectionalizer is turned off, the busbar can be divided into multiple independent busbar segments. When the sectionalizer is turned on, the busbar segments can be connected into one busbar. The sectionalizer can be, for example, a circuit breaker, an isolating switch, a load switch, etc.

[0048] The load may be, for example, any electrical equipment or device that can be connected to a busbar and obtain electrical energy from the busbar, such as a transformer, an industrial or large-scale public facility electrical load, and the like.

[0049] In one example: the segmented switch is turned on to connect the busbars of each segment into one busbar. The main transformer module continues to operate to supply power to the load through the busbar, and the total rated capacity of the main transformer module is not less than the sum of the maximum demand of the load to meet the power supply demand of the load. In order to improve the stability of the power supply system, another transformer module can be used as a backup transformer module, which does not need to be put into operation under normal circumstances. When a main transformer module is out of use due to maintenance or other reasons, the backup transformer module takes over the main transformer module and runs in parallel with the remaining transformer modules to supply power to the load to meet the power supply demand of the load. This operating mode has the problem of increased energy consumption when the main transformer module runs at full load, and faces safety operation problems such as overload tests.

[0050] In view of this, the present application proposes a control method for a power supply system, and sets two operating modes for the power supply system: a standby mode and a grouping mode. In the grouping mode, the main transformer module and the standby transformer module are divided into transformer groups, and the bus is divided into multiple bus segments. Each transformer group supplies power to the load connected to the bus segment through the corresponding bus segment, and the total rated capacity of the transformer group is not less than the sum of the maximum demand of the load connected to the corresponding bus segment. In this mode, the standby transformer module is used to work together with the main transformer module, and the standby transformer module shares the load of the main transformer module, thereby reducing the load rate of the main transformer module and improving the safety of equipment operation. In the standby mode, the bus segments are connected into one bus, and the transformer modules of each group are combined into one group, and the transformer modules in normal operation are used to jointly supply power to the load connected to the bus. In this mode, when any of the main transformer modules or the backup transformer modules is shut down, the remaining normally operating transformer modules of the power supply system can share the load of the faulty transformer module and provide electrical energy to the load, so as to avoid the situation where the total rated capacity of the normally operating transformer modules in the faulty transformer group is insufficient to provide sufficient electrical energy for the corresponding load, thereby ensuring the normal power demand of the load.

[0051] It should be understood that the main transformer module and the standby transformer module can also be connected to other power supply systems / power supply equipment to access electrical energy, such as busbars of different voltages, or generators, etc., and the embodiments of the present application are not limited to this.

[0052] It should be understood that the rated capacity of the transformer module and the maximum demand of the load in the present application are only used to illustrate the electric energy that the transformer module can provide to the load and the electric energy consumed by the load. Whether there is a proportional conversion relationship between the rated capacity and the maximum demand is not limited in the embodiments of the present application.

[0053] It should be understood that the execution subject of the embodiment of the present application may be, for example, a control host, which may be, for example, any host capable of outputting a high-level or low-level control signal, such as a single-chip microcomputer, an embedded processor, a programmable logic device, or any other processing unit. Optionally, in addition to the processing unit, it may also include a peripheral circuit unit of the processing unit. Connection relationship between the control host and the main transformer module and the standby transformer module Figure 1 Not shown.

[0054] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0055] Figure 2The flowchart of the first power supply system control method provided in the embodiment of the present application is as follows. Figure 2 As shown, the method comprises the following steps:

[0056] S201. Receive a mode instruction, where the mode instruction is used to indicate a standby mode or a grouping mode.

[0057] The operator can trigger the mode command by operating the switch, button or knob on the control panel, or by clicking the button or icon on the graphical interface of the control host, or by sending the control command to the control host through the network communication system to trigger the mode command; or, the control host can trigger the mode command according to the operating status by detecting the operating status of the power supply system; or, the mode command can be triggered by switching the status of the hard pressure plate. For example, the hard pressure plate in the "exit state" indicates the grouping mode; the hard pressure plate in the "input state" indicates the standby mode.

[0058] S202: Check whether the mode instruction is a standby mode or a grouping mode.

[0059] If the mode instruction indicates the standby mode, step S203 is executed; if the mode instruction indicates the grouping mode, step S204 is executed.

[0060] S203, controlling the section switch to be turned on, controlling the main transformer module to continue to operate, and controlling the standby transformer module to stop operating; wherein the total rated capacity of the main transformer modules is not less than the total maximum demand of the loads.

[0061] For example, by controlling the section switch to be turned on, the busbar sections can be connected into one busbar. By controlling the main transformer module to continue to operate and the standby transformer module to stop operating, the main transformer module can provide power to the load together, and the standby transformer module can stop providing power to the load. The total rated capacity of the main transformer module is not less than the total maximum demand of the load, so that when only the main transformer module is operating, sufficient power can be provided to the load to meet the power demand of the load. The mode in which the power supply system is in this case is called the standby mode.

[0062] S204. Control the section switch to open to divide the bus into multiple bus sections; and group the main transformer modules and the standby transformer modules to obtain a transformer group corresponding to each bus section, and control the transformer modules under the transformer group to operate continuously; wherein the bus sections are connected to the transformer modules under the corresponding transformer groups, and the sum of the rated capacities of the transformer modules under each transformer group is not less than the sum of the maximum demands of the loads under the corresponding bus sections.

[0063] For example, by controlling the section switch to be disconnected, the bus can be divided into multiple bus sections, and each bus section is isolated from each other. The main transformer module and the standby transformer module are grouped to obtain a transformer group corresponding to each bus section, and the transformer modules under the transformer group are controlled to operate continuously, so that the transformer modules under each transformer group can simultaneously provide power to the loads under the corresponding bus section, without providing power to the loads under the remaining bus sections. The sum of the rated capacities of the transformer modules under each transformer group is not less than the sum of the maximum demands of the loads under the corresponding bus section, so that the transformer modules under the transformer group can meet the power demand of the corresponding loads. The mode in which the power supply system is in at this time is called the grouping mode.

[0064] In one possible implementation, the control host can preset the grouping logic, for example, the grouping logic can be preset according to the maximum demand of the load connected to the bus segment, and the main transformer modules and the backup transformer modules are grouped according to the grouping logic, so that the sum of the rated capacities of the transformer modules under the transformer group corresponding to each bus segment is not less than the sum of the maximum demand of the load under the corresponding bus segment, so that the transformer modules in the transformer group can meet the power demand of the load to the greatest extent. In another possible implementation, the control host can group the main transformer modules and the backup transformer modules according to the real-time load demand, so as to obtain the transformer group corresponding to each bus segment, and the sum of the rated capacities of the transformer modules under each transformer group is not less than the sum of the real-time demand of the load under the corresponding bus segment. Grouping according to the real-time load demand can balance the load of each transformer group and reduce the overall load rate of the transformer modules.

[0065] Furthermore, while grouping the main transformer modules and the standby transformer modules, the loads can also be grouped to obtain the load groups corresponding to each bus segment. In one possible implementation, the control host can preset the load grouping logic, for example, the load groups can be divided according to the maximum demand of the load, and the sum of the maximum demand of each load group is equal. Balanced load distribution can reduce the risk of overloading certain bus segments, and the operating load of the transformer group will be more balanced, improving the stability and reliability of the power supply system.

[0066] In summary, in the grouping mode, the main transformer module and the standby transformer module are divided into transformer groups, and the bus is divided into multiple bus segments. Each transformer group supplies power to the load connected to the bus segment through the corresponding bus segment, and the total rated capacity of the transformer group is not less than the sum of the maximum demand of the load connected to the corresponding bus segment. This mode uses the standby transformer module to work together with the main transformer module. The standby transformer module shares the load of the main transformer module, thereby reducing the load rate of the main transformer module and improving the safety of equipment operation. When any transformer module in the main transformer module or the standby transformer module is disabled, the operation of the power supply system can use the standby mode, connect the bus segments into one bus, combine the transformer modules of each group into one group, use the normally operating transformer modules to jointly supply power to the load connected to the bus, and all normally operating transformer modules jointly share the load of the faulty transformer module. This is to avoid the situation where the total rated capacity of the normally operating transformer modules in the faulty transformer group is insufficient to provide sufficient electrical energy for the corresponding load, thereby ensuring the normal power demand of the load.

[0067] Figure 3 This is a schematic diagram of the structure of the second power supply system provided in the embodiment of the present application. Figure 3 As shown, the sectionalizing switch on the bus includes a first sectionalizing switch, the main transformer module includes a first transformer module, a second transformer module, and a third transformer module, and the standby transformer module includes a fourth transformer module. When the first sectionalizing switch is disconnected, the bus can be divided into a first bus segment and a second bus segment, and when the first sectionalizing switch is turned on, the first bus segment and the second bus segment can be connected into one bus.

[0068] Optionally, the power supply system further includes: a current transformer (CT) and / or a voltage transformer (VT) connected to the transformer module.

[0069] The current transformer may be, for example, any device that can convert a high current into a lower current that is easy to measure. The control host may detect the current flowing through the transformer module through the current transformer. The voltage transformer may be, for example, any device that can convert a high voltage into a lower voltage that is easy to measure. The control host may use the voltage transformer to detect the voltage of the transformer module. The voltage transformer located at the input end of the transformer module may be used to detect the input voltage of the transformer module, and the voltage transformer located at the output end of the transformer module may be used to detect the output voltage of the transformer module. Figure 3 The current transformer and the voltage transformer are located at the output end of the transformer module as an example for schematic illustration.

[0070] Optionally, the power supply system further includes: a current transformer and / or a voltage transformer connected to the load. The control host can detect the current of the load through the current transformer connected to the load, and can detect the supply voltage of the load through the voltage transformer connected to the load, so as to detect the actual power consumed by the load, also called the actual power consumption of the load.

[0071] It should be understood that the rated capacities of the first transformer module, the second transformer module, the third transformer module, and the fourth transformer module may be the same or different, and this is not limited in the embodiments of the present application.

[0072] It should be understood that Figure 3 The units related to the present application in the power supply system are only given as examples, and the embodiments of the present application only provide illustrative descriptions of the functions related to the present application. In the specific implementation, whether the power supply system has other units and other functions is not limited in the embodiments of the present application.

[0073] Figure 4 The following is a flow chart of a second method for controlling a power supply system provided in an embodiment of the present application. Figure 4 As shown, the method may include the following steps:

[0074] S401. Receive a mode instruction, where the mode instruction is used to indicate a standby mode or a grouping mode.

[0075] For example, when the state of the hard pressure plate is "in-use state", the mode instruction is determined to indicate the standby mode; when the state of the hard pressure plate is "out-use state", the mode instruction is determined to indicate the grouping mode.

[0076] S402, detecting whether the mode instruction is a standby mode or a grouping mode.

[0077] If the mode instruction indicates the standby mode, step S403 is executed; if the mode instruction indicates the grouping mode, step S404 is executed.

[0078] S403. If the mode instruction indicates the standby mode, the first segment switch is controlled to be turned on, and the first transformer module, the second transformer module, and the third transformer module are controlled to continue to operate, and the fourth transformer module is controlled to stop operating; wherein the sum of the rated capacities of the first transformer module, the second transformer module, and the third transformer module is not less than the sum of the maximum demands of the loads.

[0079] For example, the control host can control the first segment switch to be turned on, for example, the control host can control it by sending a high level or low level signal to the first segment switch. When the first segment switch is turned on, the first bus segment and the second bus segment are connected to form a bus. The control host can control the first transformer module, the second transformer module, the third transformer module and the fourth transformer module to continue to operate or stop operating, for example, the control host can control it by sending a control instruction to the first transformer module, the second transformer module and the third transformer module through the communication interface. When the first transformer module, the second transformer module and the third transformer module continue to operate and the fourth transformer module is controlled to stop operating, the first transformer module, the second transformer module and the third transformer module jointly provide electrical energy to the load connected to the bus, and the fourth transformer module stops providing electrical energy to the load connected to the bus. The sum of the rated capacities of the first transformer module, the second transformer module and the third transformer module is not less than the sum of the maximum demand of the load, and sufficient electrical energy can be provided to the load to meet the power demand of the load.

[0080] S404. If the mode instruction indicates the grouping mode, the first section switch is controlled to be disconnected to divide the bus into a first bus section and a second bus section; and the first transformer module and the second transformer module are divided into a first transformer group, and the third transformer module and the fourth transformer module are divided into a second transformer group, and the first transformer module, the second transformer module, the third transformer module, and the fourth transformer module are controlled to operate continuously; wherein the sum of the rated capacities of the first transformer module and the second transformer module is not less than the sum of the maximum demand of the loads under the first bus section, and the sum of the rated capacities of the third transformer module and the fourth transformer module is not less than the sum of the maximum demand of the loads under the second bus section.

[0081] For example, the control host can control the first segment switch to be disconnected, for example, the control host can control it by sending a high level or low level signal to the first segment switch. When the first segment switch is disconnected, the bus can be divided into a first bus segment and a second bus segment, and the first bus segment and the second bus segment are isolated from each other. The first transformer module and the second transformer module are divided into a first transformer group, and the first transformer group is connected to the first bus segment; the third transformer module and the fourth transformer module are divided into a second transformer group, and the second transformer group is connected to the second bus segment; and the first transformer module, the second transformer module, the third transformer module, and the fourth transformer module are controlled to continue to operate, for example, the control host can control it by sending a control instruction to the first transformer module, the second transformer module, the third transformer module, and the fourth transformer module through the communication interface. At this time, the two transformer modules of the first transformer group jointly provide power for the load under the first bus segment, and the two transformer modules of the second transformer group jointly provide power for the load under the second bus segment. The total rated capacity of the first transformer module and the second transformer module is not less than the total maximum demand of the loads under the first bus section, and the total rated capacity of the third transformer module and the fourth transformer module is not less than the total maximum demand of the loads under the second bus section. The first transformer group and the second transformer group can respectively provide sufficient electrical energy for the corresponding loads to meet the power demand of the loads. The continuous operation of the four transformer modules can reduce the load rate of the transformer modules.

[0082] The four transformer modules can be grouped in pairs to independently provide power for the loads under the corresponding bus sections, or the two bus sections can be merged into one bus, and three transformer modules can be used to jointly supply power to the loads under the bus. When all four transformer modules can operate normally, the load rate of the transformer modules can be reduced. When any transformer module stops operating due to maintenance or other reasons, the remaining three normally operating transformer modules can be used to provide sufficient power for the load to ensure the normal power demand of the load.

[0083] Further, in Figure 3 In the power supply system shown, the control host can also detect whether an abnormality occurs in the transformer module based on the current value of the current transformer and / or the voltage value of the voltage transformer. For example, the control host determines that an abnormality occurs in the transformer module when the current value of the current transformer is less than a first preset current value. Alternatively, the control host determines that an abnormality occurs in the transformer module when the voltage value of the voltage transformer is less than a first preset voltage value. Alternatively, the control host determines that an abnormality occurs in the transformer module when the power value obtained based on the current value of the current transformer and the voltage value of the voltage transformer is greater than the first preset power value. Among them, the first preset power value can be 50 milliwatts (mW), which can be specifically set according to actual conditions, and the embodiments of the present application are not limited to this.

[0084] The following describes the change in the operation mode of the power supply system when any transformer module fails or returns to normal.

[0085] (1) If any transformer module fails and the current mode is group mode, the current mode is switched to standby mode.

[0086] If any transformer module is abnormal and the current mode is group mode, the number of transformer modules that provide power to the loads under the corresponding bus segment in the group where the abnormal transformer module is located will be reduced. The transformer modules that operate normally under this group may not be able to provide enough power for the corresponding loads. Switching the current mode to the standby mode can connect the bus segments into one bus, and the remaining normally operating transformer modules can jointly provide power for all loads under the bus, which can ensure the power demand of the loads.

[0087] like Figure 3 In the architecture shown, if an abnormality occurs in the first transformer module, the first transformer group will change from the original first transformer module and the second transformer module jointly providing power for the load under the first bus segment to the second transformer module alone providing power for the load under the first bus segment, and the power supply capacity will be reduced by half. Under normal circumstances, the redundancy of the transformer in the power supply system will be less than 50%, so the second transformer module in the first transformer group may not be able to provide enough power for the load under the first bus segment. After switching the current mode to the standby mode, the first bus segment and the second bus segment are connected to a bus, and the second transformer module, the third transformer module, and the fourth transformer module jointly supply power to the load to ensure the power demand of the load.

[0088] (2) If any transformer module has an abnormality and the current mode is the standby mode, the current mode is maintained as the standby mode, and the transformer module with the abnormality is controlled to stop running, and the remaining transformer modules are controlled to continue running.

[0089] Maintaining the standby mode before any transformer module resumes normal operation after an abnormality occurs can ensure the power demand of the load.

[0090] (3) If the abnormal transformer module returns to normal and the current mode is the standby mode, the current mode is switched to the grouping mode.

[0091] After the abnormal transformer module returns to normal, the current mode is switched to the grouping mode, so that the restored transformer module can be put into normal operation, thereby reducing the load rate of the transformer module and improving the safety of equipment operation.

[0092] According to the current value of the current transformer and / or the voltage value of the voltage transformer, whether the transformer module is abnormal is detected, and when the transformer module is abnormal, the working mode is switched to ensure the power demand of the load. When the transformer module returns to normal, the operating mode of the power supply system is switched to reduce the load rate of the transformer module and improve the safety of equipment operation.

[0093] Furthermore, during the operation of the power supply system, the transformer module may also be overloaded due to a newly added load or a short circuit, that is, the actual power consumed by the load exceeds the power that the transformer module can provide. The following is a schematic illustration of how the control host detects whether the transformer module is overloaded and how to handle the overloaded transformer module.

[0094] S405, detecting whether the transformer module is overloaded.

[0095] If yes, execute step S406.

[0096] In one example, when the transformer module is overloaded, the load current increases, and the current of the transformer module increases. Therefore, when it is detected that the current value of the current transformer connected to any transformer module is greater than the second preset current value, or when the power determined by the current value of the current transformer connected to the output end of any transformer module and the voltage value of the voltage transformer is greater than the second preset power value, it can be considered that the transformer module is overloaded. Among them, the first preset current value should be less than the second preset current value, and the value of the second preset power can be a value equal to the rated capacity of the transformer module, or a value greater than or less than the rated capacity of the transformer module. It can be set according to actual conditions, and the embodiment of the present application does not limit this.

[0097] In one example, the control host can also detect the temperature of the transformer module through a temperature sensor. When the grid is overloaded, the temperature of the transformer module will increase. When the detected temperature of the transformer module is higher than the preset temperature, it can be considered that the transformer module is overloaded.

[0098] In one example, the control host can also detect the current value of the current transformer connected to the load to detect the current value of the load. When the sum of the current values ​​of the current transformers of the loads connected to the bus or bus segment connected to the transformer module exceeds the sum of the rated current values ​​of the transformer modules connected to the bus or bus segment, it is considered that the transformer module connected to the bus or bus segment is overloaded.

[0099] S406: When any transformer module is overloaded, the bus connected to the transformer module or the load connected to the bus segment is cut off according to the overload amount.

[0100] When any transformer module is overloaded, the actual output power of the transformer module can be obtained based on the current value and voltage value of the transformer module. The part of the actual output power of the transformer module that exceeds the rated capacity is the overload of the transformer module. Cutting off the bus connected to the transformer module or the load connected to the bus segment according to the overload can make the transformer module work within the rated capacity range, improve the operational safety of the transformer module, and ensure the stable operation of the power supply system.

[0101] In one example, the power supply system further includes a load connection switch, which may be any power switch that can be turned on or off based on a high level signal / low level signal, such as a circuit breaker, an isolating switch, a load switch, etc. The load is connected to the bus or bus segment through the corresponding connection switch. When the load connection switch is turned on, the connection between the corresponding load and the bus or bus segment is turned on; when the load connection switch is turned off, the connection between the corresponding load and the bus or bus segment is cut off.

[0102] Furthermore, when a single transformer module is detected to be overloaded, the following two methods can be used to detect the remaining transformer modules connected to the bus or bus segments.

[0103] A possible implementation method is that when it is detected that any transformer module has an off-grid overload, the busbar or busbar segment connected to the transformer module is locked. The locking operation means that the off-grid overload of other transformer modules connected to the busbar or busbar segment is no longer detected. Only for the transformer module that first has an off-grid overload, the load connected to the busbar or busbar segment connected to the transformer module is cut off according to the overload amount, so that when the transformer module has an off-grid overload, a timely response can be made, thereby improving the safety and stability of the power supply system operation. And avoid the off-grid overload that may occur successively in the remaining transformer modules connected to the busbar or busbar segment connected to the transformer module that has an off-grid overload due to sharing the load of the transformer module, resulting in repeated calculation of the overload amount, thereby cutting off the load that exceeds the actual overload amount.

[0104] Another possible implementation is that each transformer module independently determines whether it is overloaded. When any transformer module is overloaded, the bus connected to the transformer module or other transformer modules connected to the bus segment are still judged to be overloaded. The overload amount is calculated based on the overload conditions of all transformer modules connected to the bus or bus segment, which can avoid the situation where a large load is removed due to a single transformer module failure.

[0105] When the bus connected to the transformer module or the load connected to the bus segment is cut off according to the overload, it can also be executed in the following two ways, which are described below:

[0106] A possible implementation method is that when the load connected to the bus or bus segment connected to the transformer module is cut off according to the overload amount, the load connected to the bus or bus segment connected to the transformer module can also be cut off in order of the load protection priority from low to high. For example, the control host can record the load protection priority. In the grouping mode, when the transformer module is overloaded, the load connected to the bus segment connected to the transformer module is cut off in order of the load protection priority from low to high; in the standby mode, when the transformer module is overloaded, the load connected to the bus connected to the transformer module is cut off in order of the load protection priority from low to high. When the load is overloaded, the power supply of important loads can be prioritized to reduce the impact on key equipment and important services.

[0107] Another possible implementation is that the control host can also detect whether the load is abnormal, and cut off the load when any load is abnormal. For example, the control host can detect the actual power consumption of the load through the value of the current transformer and / or voltage transformer connected to the load. The actual power consumption of the load connected to the detected bus or bus segment is compared with the maximum demand corresponding to the load stored in the control host. For example, when the actual power consumption of the load is much greater than the maximum demand of the load, it can be considered that the load is abnormal. Cut off the load to inspect the load circuit and ensure the normal operation of the power supply system.

[0108] Furthermore, a shedding coefficient can be set for each transformer module according to the system design and operation requirements. The overload shedding amount is calculated based on the overload amount and the shedding coefficient, and the load connected to the bus connected to the transformer module or the bus segment is shedding according to the overload shedding amount. The overload shedding amount can be the sum of the product of the overload amount and the shedding coefficient of each transformer module at the current moment. The shedding coefficient is used to determine the proportion of load that needs to be shedding for each main transformer. By calculating the overload shedding amount and shedding the corresponding load, the load pressure of the transformer module can be quickly reduced and the reliability of the power supply system can be improved.

[0109] In summary, during the operation of the power supply system, when the transformer module is overloaded, in the grouping mode, the load connected to the bus segment connected to the transformer module is cut off according to the overload, without affecting the transformer modules under the other bus segments to provide power to the load; in the standby mode, the load connected to the bus segment connected to the transformer module is cut off according to the overload. This can ensure the safe operation of the transformer module. Load shedding is carried out in order of load protection priority from low to high, which can give priority to the power supply of important loads and minimize the impact on the power supply system.

[0110] It should be understood that the embodiments of the present application can be applied to the scenario of a single busbar or a double busbar. The following is an application scenario in which the power supply system is a double busbar, corresponding to four transformer modules and two groups of loads. The rated capacity of each transformer module is 360 megavolt-amperes (MVA). The transformer module obtains electrical energy through a 330 kilovolt (kV) busbar, and is transformed into a 110kV voltage by the transformer module to provide electrical energy for the load. The maximum demand of the first load and the second load is 500 megawatts (MW) for example. In this application scenario, when the four transformer modules are operated in parallel, the short-circuit current on the 110kV side is too large and may exceed the circuit breaker interrupting capacity on the 110kV side. When a short circuit occurs in the load, the circuit breaker may not be disconnected, thereby affecting the pressing and stable operation of the power supply system. Therefore, in actual applications, the four transformer modules are not allowed to run in parallel. The following is a schematic illustration of how to control the operation of the power supply system.

[0111] Figure 5 This is a schematic diagram of the structure of the third power supply system provided in the embodiment of the present application. Figure 5 As shown, a first section switch S1 is provided on the 110kV first bus, and a first section switch S2 is provided on the 110kV second bus. When the first section switches S1 and S2 are disconnected, the 110kV first bus is divided into a first bus section 110kV I bus and a second bus section 110kV II bus, and the 110kV second bus is divided into a first bus section 110kVIII bus and a second bus section 110kV IV bus. The 110kV I bus and the 110kVIII bus are connected through the first bus tie switch S3, and the 110kV II bus and the 110kV IV bus are connected through the second bus tie switch S4.

[0112] The first transformer module is the #1 main transformer, the second transformer module is the #2 main transformer, the third transformer module is the #3 main transformer, and the fourth transformer module is the #4 main transformer. The #1 main transformer is connected to the current transformer CT1 and the voltage transformer VT1, the #2 main transformer is connected to the current transformer CT2 and the voltage transformer VT2, the #3 main transformer is connected to the current transformer CT3 and the voltage transformer VT3, and the #4 main transformer is connected to the current transformer CT4 and the voltage transformer VT4.

[0113] The first load includes: load 1-1, load 1-2, load 1-3, load 1-4, which are connected to the first bus segment 110kV I bus and 110kVIII bus through corresponding load connection switches S5, S6, S7, S8 respectively; the second load includes: load 2-1, load 2-2, load 2-3, load 2-4, which are connected to the second bus segment 110kV II bus and 110kV IV bus through corresponding load connection switches S9, S10, S11, S12 respectively. Load 1-1 is connected to current transformer CT5 and voltage transformer VT5, load 1-2 is connected to current transformer CT6 and voltage transformer VT6, load 1-3 is connected to current transformer CT7 and voltage transformer VT7, load 1-4 is connected to current transformer CT8 and voltage transformer VT8, load 2-1 is connected to current transformer CT9 and voltage transformer VT9, load 2-2 is connected to current transformer CT10 and voltage transformer VT10, load 2-3 is connected to current transformer CT11 and voltage transformer VT11, and load 2-4 is connected to current transformer CT12 and voltage transformer VT12.

[0114] Control host and the connection relationship between the control host and the transformer module, section switch, and load connection switch Figure 5 Not shown.

[0115] Below Figure 5 Under the structure of the power supply system, it is explained how the control host controls the operation of the power supply system when the power supply system is in grouping mode and standby mode respectively.

[0116] 1. Backup Mode

[0117] 1. When the state of the hard pressure plate is "engaged state", determine that the mode instruction indicates the standby mode.

[0118] 2. Control the first segment switch to be turned on, and control the first transformer module, the second transformer module, and the third transformer module to continue to operate, and control the fourth transformer module to stop operating; wherein the sum of the rated capacities of the first transformer module, the second transformer module, and the third transformer module is not less than the sum of the maximum demand of the load.

[0119] For example, the control host can send a high level to the first section switch S1 and the first section switch S2, and the first section switch S1 and the first section switch S2 are turned on. The control host sends a high level to the first bus tie switch S3 and the second bus tie switch S4, and the first bus tie switch S3 and the second bus tie switch S4 are turned on, and the 110kV first bus and the 110kV second bus are no longer segmented. The control host sends a high level to the load connection switches S5-S12, and the load connection switches S5-S12 are turned on. The #1 main transformer, #2 main transformer, #3 main transformer, and #4 main transformer are all connected to the 110kV first bus and the 110kV second bus; the #1 main transformer, #2 main transformer, and #3 main transformer continue to operate, and the #4 main transformer stops operating. The total rated capacity of #1 main transformer, #2 main transformer and #3 main transformer is 1080MVA, the total maximum demand of the first load and the second load under the 110kV first bus and the 110kV second bus is 1000MW, and the load rate of #1 main transformer, #2 main transformer and #3 main transformer is about 93%-98%.

[0120] 3. Check whether the transformer module is overloaded.

[0121] The control host can detect whether the transformer module is overloaded by detecting the values ​​of the current transformer and the voltage transformer connected to the transformer module. For example, the control host can detect the actual output power of the #1 main transformer by detecting the values ​​of the current transformer CT1 and the voltage transformer VT1; detect the actual output power of the #2 main transformer by detecting the values ​​of the current transformer CT2 and the voltage transformer VT2; detect the actual output power of the #3 main transformer by detecting the values ​​of the current transformer CT3 and the voltage transformer VT3; detect the actual output power of the #4 main transformer by detecting the values ​​of the current transformer CT4 and the voltage transformer VT4. When the actual output power of any main transformer is greater than the rated capacity of the main transformer, it can be considered that the main transformer is overloaded.

[0122] In one example, the control host can also detect whether the transformer module connected to the bus or bus segment is overloaded by detecting the total actual power consumption of the loads connected to the bus or bus segment. For example, the control host can detect the actual power consumption of load 1-1 by detecting the values ​​of current transformer CT5 and voltage transformer VT5; detect the actual power consumption of load 1-2 by detecting the values ​​of current transformer CT6 and voltage transformer VT6; detect the actual power consumption of load 1-3 by detecting the values ​​of current transformer CT7 and voltage transformer VT7; detect the actual power consumption of load 1-4 by detecting the values ​​of current transformer CT8 and voltage transformer VT8; the sum of the actual power consumption of load 1-1, load 1-2, load 1-3, and load 1-4 is the actual power consumption of the first load. The control host detects the actual power consumption of load 2-1 by detecting the values ​​of current transformer CT9 and voltage transformer VT9; detects the actual power consumption of load 2-2 by detecting the values ​​of current transformer CT10 and voltage transformer VT10; detects the actual power consumption of load 2-3 by detecting the values ​​of current transformer CT11 and voltage transformer VT11; detects the actual power consumption of load 2-4 by detecting the values ​​of current transformer CT12 and voltage transformer VT12; the sum of the actual power consumption of load 2-1, load 2-2, load 2-3 and load 2-4 is the actual power consumption of the second load.

[0123] When the sum of the actual power consumption of the first load and the actual power consumption of the second load exceeds the sum of the rated capacities of the #1 main transformer, the #2 main transformer and the #3 main transformer, it can be considered that the main transformer connected to the busbar is overloaded.

[0124] 4. When any transformer module is overloaded, the other transformer modules connected to the busbar connected to the transformer module are locked, and the overload of other transformer modules connected to the busbar is no longer detected. For example, if the #1 main transformer is overloaded first, the #2 and #3 main transformers connected to the busbar are locked, and the overload of #2 and #3 main transformers is no longer detected.

[0125] 5. When any transformer module is overloaded, the load connected to the busbar to which the transformer module is connected shall be cut off according to the overload amount and in the order of load protection priority from low to high.

[0126] If any of the main transformers #1, #2 or #3 is overloaded, for example, the first load and the second load are load 1-1, load 2-1, load 1-2, load 2-2, load 1-3, load 2-3, load 1-4, and load 2-4 in descending order of priority. According to the overload, the loads 2-4, load 1-4, load 2-3, load 1-3, load 2-2, load 1-2, load 2-1, and load 1-1 connected to the bus are cut off in descending order of load priority. For example, if the overload of the main transformer #1 is 100MW, the control host detects that the actual power consumption of load 2-4 is 90MW, and the actual power consumption of load 1-4 is 50MW, the control host can send a low level to the load connection switch S12, and the load connection switch S12 is disconnected to cut off the load 2-4; the control host can send a low level to the load connection switch S8, and the load connection switch S8 is disconnected to cut off the load 1-4. When the transformer module is detected to be overloaded, the load connected to the busbar is cut off to ensure the safety of the main transformer operation.

[0127] In one example, the control host can also detect the actual power consumed by the load by detecting the values ​​of the current transformer and the voltage transformer connected to the load, and compare the actual power consumption of the detected load with the corresponding maximum demand stored to determine the load that may cause the main transformer to overload, and cut off the load to inspect and repair the load circuit to ensure the normal operation of the power supply system.

[0128] Optionally, when any transformer module is overloaded, the overload shedding amount can be calculated according to the overload amount, and the load connected to the busbar connected to the transformer module can be shelved in descending order of the load protection priority according to the overload shedding amount. For example, the overload shedding amount can be calculated according to the product of the overload amount of each transformer module at the current moment and the shedding coefficient.

[0129] As mentioned above, when the control host detects that the actual output power of the #1 main transformer is greater than the rated capacity of the #1 main transformer, it can be considered that the #1 main transformer is overloaded. At this time, the #2 main transformer and the #3 main transformer are locked, and the overload and overload cut-off quantity are calculated for the #1 main transformer. The overload cut-off quantity can be the sum of the product of the overload and the cut-off coefficient of each transformer module at the current moment. For example, if the overload is 100MW and the cut-off coefficient of the #1 main transformer is 0.9, the overload cut-off quantity is 90MW. If both the #1 main transformer and the #2 main transformer are overloaded, the overload of the #1 main transformer is 50MW, the cut-off coefficient of the #1 main transformer is 0.9, the overload of the #2 main transformer is 50MW, and the cut-off coefficient of the #2 main transformer is 0.8, then the overload cut-off quantity is: 50MW*0.9+50MW*0.8=85MW. If the actual power consumed by load 2-4 is 45W, the control host can send a low level to the load connection switch S12, and the load connection switch S12 is disconnected to cut off load 2-4, without cutting off load 2-4 and load 1-4 at the same time. It can ensure that sufficient power is provided to the load within the load carrying range of the transformer.

[0130] In one example, the control host can also detect the actual power consumed by the load by detecting the values ​​of the current transformer and voltage transformer connected to the load, and compare the actual power consumption of the detected load with the corresponding maximum demand stored to determine the load that may cause the main transformer to overload, and cut off the load to repair the load circuit to ensure the normal operation of the power supply system. For example, the maximum demand of load 1-2 is 125MW, and the control host detects that the actual power consumed by the load is 300MW. It can be considered that the load may be faulty, and the load can be cut off to repair the load circuit to ensure the normal operation of the power supply system.

[0131] 6. When the hard pressure plate is switched from "on state" to "off state", the mode instruction indicating the grouping mode is triggered. The control host responds to the mode instruction and sends a low level to the first section switch S1 and the first section switch S2. The first section switch S1 and the first section switch S2 are disconnected to divide the 110kV first bus and the 110kV second bus into the first bus section and the second bus section, and control the #1 main transformer, #2 main transformer, #3 main transformer, and #4 main transformer to continue to operate. The #1 main transformer and the #2 main transformer provide power to the first load under the first bus section, and the #3 main transformer and the #4 main transformer provide power to the first load under the second bus section, so as to switch to the grouping mode.

[0132] 2. Grouping Mode

[0133] 1. When the state of the hard pressure plate is "exit state", the mode instruction indicates the grouping mode.

[0134] 2. Control the first section switch to be disconnected to divide the bus into the first bus section and the second bus section; and divide the first transformer module and the second transformer module into the first transformer group, and divide the third transformer module and the fourth transformer module into the second transformer group, and control the first transformer module, the second transformer module, the third transformer module, and the fourth transformer module to operate continuously; wherein the sum of the rated capacities of the first transformer module and the second transformer module is not less than the sum of the maximum demand of the loads under the first bus section, and the sum of the rated capacities of the third transformer module and the fourth transformer module is not less than the sum of the maximum demand of the loads under the second bus section

[0135] For example, the control host can send a low level to the first section switch S1 and the first section switch S2, and the first section switch S1 and the first section switch S2 are disconnected. The control host sends a high level to the first bus tie switch S3 and the second bus tie switch S4, and the first bus tie switch S3 and the second bus tie switch S4 are turned on. The 110kV first bus and the 110kV second bus are divided into the first bus segment and the second bus segment. The first bus segment includes the 110kV I bus and the 110kVIII bus, and the second bus segment includes the 110kV II bus and the 110kV IV bus. The control host sends a high level to the load connection switches S5-S12, and the load connection switches S5-S12 are turned on. The #1 main transformer and the #2 main transformer are the first transformer group, connected to the first bus segment; the #3 main transformer and the #4 main transformer are the second transformer group, connected to the second bus segment; the #1 main transformer, the #2 main transformer, the #3 main transformer, and the #4 main transformer are in continuous operation. The total rated capacity of #1 main transformer and #2 main transformer is 720MVA, the total maximum demand of the first load under the first bus section is 500MW, and the load rate of #1 main transformer and #2 main transformer is about 70%; the total rated capacity of #3 main transformer and #4 main transformer is 720MVA, the total maximum demand of the first load under the first bus section is 500MW, and the load rate of #3 main transformer and #4 main transformer is about 70%.

[0136] 3. Check whether the transformer module is overloaded.

[0137] The control host can detect whether the transformer module is overloaded by detecting the values ​​of the current transformer and the voltage transformer connected to the transformer module. For example, the control host can detect the actual output power of the #1 main transformer by detecting the values ​​of the current transformer CT1 and the voltage transformer VT1; detect the actual output power of the #2 main transformer by detecting the values ​​of the current transformer CT2 and the voltage transformer VT2; detect the actual output power of the #3 main transformer by detecting the values ​​of the current transformer CT3 and the voltage transformer VT3; detect the actual output power of the #4 main transformer by detecting the values ​​of the current transformer CT4 and the voltage transformer VT4. When the actual output power of any main transformer is greater than the rated capacity of the main transformer, it can be considered that the main transformer is overloaded.

[0138] In one example, in group mode, when the actual power consumption of the first load exceeds the sum of the capacities of the #1 main transformer and the #2 main transformer, it can be considered that the main transformer connected to the first bus segment is overloaded. When the actual power consumption of the second load exceeds the sum of the rated capacities of the #3 main transformer and the #4 main transformer, it can be considered that the main transformer connected to the second bus segment is overloaded. For details on how to detect the actual power consumption of the first load and the actual power consumption of the second load, please refer to the above description, which will not be repeated here.

[0139] 4. When any transformer module is overloaded, the other transformer modules connected to the bus segment connected to the transformer module are locked, and the overload of other transformer modules connected to the bus segment is no longer detected.

[0140] For example, if the control host detects that the actual output power of #1 main transformer is greater than the rated capacity of #1 main transformer, it can be considered that #1 main transformer is first overloaded. At this time, the #2 main transformer connected to the first bus section is locked and the overload of #2 main transformer is no longer detected.

[0141] 5. When any transformer module is overloaded, the load connected to the busbar segment connected to the transformer module shall be cut off according to the overload amount and in the order of load protection priority from low to high.

[0142] The first load includes four loads, in descending order of security priority: load 1-1, load 1-2, load 1-3, load 1-4; the second load includes four loads, in descending order of security priority: load 2-1, load 2-2, load 2-3, load 2-4.

[0143] (1) If the #1 main transformer or the #2 main transformer is overloaded, the overload amount of the #1 main transformer or the #2 main transformer is calculated, and the loads 1-4, 1-3, 1-2, and 1-1 connected to the first busbar segment are removed in order of the load protection priority from low to high, so that the #1 main transformer or the #2 main transformer can eliminate the overload problem.

[0144] (2) If the #3 main transformer or the #4 main transformer is overloaded, the overload amount of the #3 main transformer or the #4 main transformer is calculated, and the loads 2-4, 2-3, 2-2, and 2-1 connected to the first busbar segment are removed in order of the load protection priority from low to high, so that the #3 main transformer or the #4 main transformer can eliminate the overload problem.

[0145] For example, the overload of main transformer #1 is 50MW, and the control host detects that the actual power consumed by loads 1-4 is 50MW. The control host can send a low level to the load connection switch S8, and the load connection switch S8 is disconnected to cut off loads 1-4.

[0146] In one example, the control host can also detect the actual power consumed by the load by detecting the values ​​of the current transformer and the voltage transformer connected to the load, and compare the actual power consumption of the detected load with the corresponding maximum demand stored to determine the load that may cause the main transformer to overload, and cut off the load to inspect and repair the load circuit to ensure the normal operation of the power supply system.

[0147] 6. If the #1 main transformer is abnormal, the hard pressure plate can be switched from the "exit state" to the "on state" to trigger the mode command indicating the standby mode. The control host responds to the mode command and sends a high level to the first section switch S1 and the first section switch S2. The first section switch S1 and the first section switch S2 are turned on, and the #2 main transformer, #3 main transformer, and #4 main transformer are controlled to continue to operate and the #1 main transformer is controlled to stop operating, so as to switch to the standby mode, which is convenient for the maintenance operation of the #1 main transformer.

[0148] Before the #1 main transformer resumes normal operation, the current mode is maintained as the standby mode, and the hard pressure plate remains in the "on state". The control host responds to the mode instruction and sends a high level to the first section switch S1 and the first section switch S2. The first section switch S1 and the first section switch S2 are turned on, and the #2 main transformer, #3 main transformer, and #4 main transformer are controlled to continue running, and the #1 main transformer is controlled to stop running to wait for the maintenance operation of the #1 main transformer to be completed.

[0149] To sum up, the power supply control method proposed in the embodiment of the present application can control the power supply system to be in group mode or standby mode according to the received mode instruction, and in both modes, when any main transformer is detected to be overloaded, the corresponding load is cut off in time to ensure the safety and stability of the main transformer operation.

[0150] The control method of the power supply system proposed in the embodiment of the present application can reduce the load rate of the transformer module, ensure the safe operation of the transformer module, and reduce the overall power consumption of the power supply system.

[0151] Continue below Figure 5 Taking the power supply system of as an example, the power consumption of the power supply system in different working modes is explained.

[0152] The calculation formula for the lossy power consumption of the power supply system is:

[0153] ΔP=n*P0+KT*β 2 *P k

[0154] Among them, P0 is the no-load loss of the transformer module. For example, the no-load loss of #1 main transformer, #2 main transformer, #3 main transformer, and #4 main transformer is P0 = 107kW;

[0155] n is the number of transformer modules in the power supply system that provide power to the load and hot standby;

[0156] β is the load factor of the transformer module. For example, in grouping mode, β is about 0.73; in standby mode, β is about 0.98;

[0157] KT is the number of transformer modules that normally provide power to the load. In grouping mode, KT = 4; in standby mode, KT = 3.

[0158] P k is the load loss. When the maximum demand of the first load and the second load is 500MW, the load loss P k =680kW.

[0159] (I) The lossy power consumption of the power supply system in group mode is:

[0160] ΔP=4*107+4*0.73 2 *680 = 1877kW

[0161] (II) The lossy power consumption of the power supply system in standby mode is:

[0162] ΔP=3*107+3*0.98 2 *680 = 2280kW

[0163] In the prior art, three transformer modules are used to provide power to the load. When one transformer module is in hot standby mode, β is about 0.98. The lossy power consumption of the power supply system is:

[0164] ΔP=4*107+3*0.98 2 *680 = 2387kW

[0165] By using the control method of the power supply system proposed in the embodiment of the present application, it is possible to operate in group mode when the transformer modules are operating normally. When any transformer module is to be repaired, it is possible to temporarily switch to standby mode. After the maintenance of the transformer module is completed, it is possible to switch back to group mode, thereby meeting the power demand of the load. Compared with the prior art, the energy loss that can be saved per day is: (2387-1877)*24=12,000 kWh.

[0166] Figure 6 A schematic diagram of a control device for a power supply system provided in an embodiment of the present application. The power supply system comprises: a main transformer module, a standby transformer module, a bus and a load connected to the bus, wherein at least one section switch is provided on the bus.

[0167] like Figure 6 As shown, the device may include, for example: a receiving module 601 and a control module 602 .

[0168] The receiving module 601 is used to receive a mode instruction, where the mode instruction is used to indicate a standby mode or a grouping mode.

[0169] The control module 602 is used to control the segment switch to conduct if the mode instruction indicates the standby mode, and control the main transformer module to continue to operate and control the standby transformer module to stop operating; wherein the total rated capacity of the main transformer module is not less than the total maximum demand of the load.

[0170] The control module 602 is also used to control the segment switch to disconnect if the mode instruction indicates a grouping mode, so as to divide the bus into multiple bus segments; and to group the main transformer modules and the standby transformer modules to obtain a transformer group corresponding to each bus segment, and control the transformer modules under the transformer group to operate continuously; wherein the sum of the rated capacities of the transformer modules under each transformer group is not less than the sum of the maximum demands of the loads under the corresponding bus segment.

[0171] In a possible implementation, the sectionalizing switch on the bus includes a first sectionalizing switch, the main transformer module includes a first transformer module, a second transformer module, and a third transformer module, and the standby transformer module includes a fourth transformer module.

[0172] The control module 602 is specifically used to control the first segment switch to be turned on if the mode instruction indicates the standby mode, and control the first transformer module, the second transformer module, and the third transformer module to continue to operate and control the fourth transformer module to stop operating; wherein the sum of the rated capacities of the first transformer module, the second transformer module, and the third transformer module is not less than the sum of the maximum demand of the load.

[0173] The control module 602 is specifically used to control the first segment switch to be disconnected if the mode instruction indicates the grouping mode, so as to divide the bus into the first bus segment and the second bus segment; and to divide the first transformer module and the second transformer module into the first transformer group, and the third transformer module and the fourth transformer module into the second transformer group, and control the first transformer module, the second transformer module, the third transformer module, and the fourth transformer module to operate continuously; wherein the sum of the rated capacities of the first transformer module and the second transformer module is not less than the sum of the maximum demand of the loads under the first bus segment, and the sum of the rated capacities of the third transformer module and the fourth transformer module is not less than the sum of the maximum demand of the loads under the second bus segment.

[0174] In a possible implementation, the power supply system further includes: a current transformer and / or a voltage transformer connected to the transformer module; the control module 602 is further used to detect whether an abnormality occurs in the transformer module based on the current value of the current transformer and / or the voltage value of the voltage transformer.

[0175] If any transformer module fails and the current mode is group mode, the current mode is switched to standby mode.

[0176] If any transformer module is abnormal and the current mode is the standby mode, the current mode is kept as the standby mode, and the transformer module with the abnormality is controlled to stop running, and the remaining transformer modules are controlled to continue running;

[0177] If the abnormal transformer module returns to normal and the current mode is the standby mode, the current mode is switched to the grouping mode.

[0178] In a possible implementation, the control module 602 is further used to: detect whether the transformer module is overloaded; when any transformer module is overloaded, cut off the load connected to the bus connected to the transformer module or the bus segment according to the overload amount.

[0179] In a possible implementation, the control module 602 is further configured to: when it is detected that any transformer module is overloaded, lock the bus connected to the transformer module or other transformer modules connected to the bus segment.

[0180] In a possible implementation, the control module 602 is specifically configured to cut off the load connected to the bus connected to the transformer module or the bus segment according to the overload amount and in the order of the load protection priority from low to high.

[0181] The control device of the power supply system provided in the embodiment of the present application can execute the actions in the above method embodiment. Its implementation principle and technical effects are similar and will not be repeated here.

[0182] Figure 7 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. Figure 7 As shown, the communication device may include: at least one processor 701 and a memory 702 .

[0183] The memory 702 is used to store programs. Specifically, the programs may include program codes, and the program codes include computer operation instructions.

[0184] The memory 702 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0185] The processor 701 is used to execute the computer-executable instructions stored in the memory 702 to implement the actions in the aforementioned method embodiment. The processor 701 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0186] Optionally, the electronic device may further include a communication interface 703 for communicating with an external device. In a specific implementation, if the communication interface 703, the memory 702 and the processor 701 are implemented independently, the communication interface 703, the memory 702 and the processor 701 may be interconnected via a bus and communicate with each other.

[0187] Optionally, in a specific implementation, if the communication interface 703, the memory 702 and the processor 701 are integrated on a chip, the communication interface 703, the memory 702 and the processor 701 can communicate through an internal interface.

[0188] The present application also provides a computer-readable storage medium, which may include: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, and other media that can store program codes. Specifically, the computer-readable storage medium stores program instructions, and the program instructions are used to implement the actions of the above-mentioned method implementation method.

[0189] The present application also provides a computer program product, which includes an execution instruction, which is stored in a readable storage medium. At least one processor of an electronic device can read the execution instruction from the readable storage medium, and at least one processor executes the execution instruction so that the electronic device implements the actions of the above method implementation.

[0190] The present application also provides a substation, including a power supply system and a control device or electronic device of the power supply system. The power supply system includes: a main transformer module, a standby transformer module, a bus and a load connected to the bus, wherein at least one section switch is arranged on the bus.

[0191] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0192] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A control method for a power supply system, It is characterized in that The power supply system comprises: a main transformer module, a standby transformer module, a bus and a load connected to the bus, wherein at least one section switch is arranged on the bus; the control method comprises: receiving a mode instruction, wherein the mode instruction is used to indicate a standby mode or a packet mode; If the mode instruction indicates the standby mode, the segment switch is controlled to be turned on, and the main transformer module is controlled to continue to operate and the standby transformer module is controlled to stop operating; wherein the total rated capacity of the main transformer module is not less than the total maximum demand of the load; If the mode instruction indicates a grouping mode, the section switch is controlled to be disconnected to divide the bus into multiple bus sections; and the main transformer module and the standby transformer module are grouped to obtain a transformer group corresponding to each bus section, and the transformer modules under the transformer group are controlled to operate continuously; wherein, the bus sections are connected to the transformer modules under the corresponding transformer groups, and the sum of the rated capacities of the transformer modules under each transformer group is not less than the sum of the maximum demands of the loads under the corresponding bus sections.

2. The control method according to claim 1, It is characterized in that The sectionalizing switch on the bus includes a first sectionalizing switch, the main transformer module includes a first transformer module, a second transformer module, and a third transformer module, and the standby transformer module includes a fourth transformer module; the control method includes: If the mode instruction indicates the standby mode, the first segment switch is controlled to be turned on, and the first transformer module, the second transformer module, and the third transformer module are controlled to continue to operate, and the fourth transformer module is controlled to stop operating; wherein the sum of the rated capacities of the first transformer module, the second transformer module, and the third transformer module is not less than the sum of the maximum demand of the load; If the mode instruction indicates a grouping mode, the first section switch is controlled to be disconnected to divide the bus into a first bus section and a second bus section; and the first transformer module and the second transformer module are divided into a first transformer group, and the third transformer module and the fourth transformer module are divided into a second transformer group, and the first transformer module, the second transformer module, the third transformer module, and the fourth transformer module are controlled to operate continuously; wherein the sum of the rated capacities of the first transformer module and the second transformer module is not less than the sum of the maximum demand of the loads under the first bus section, and the sum of the rated capacities of the third transformer module and the fourth transformer module is not less than the sum of the maximum demand of the loads under the second bus section.

3. The control method according to claim 1, It is characterized in that The power supply system further includes: a current transformer and / or a voltage transformer connected to the transformer module; the control method further includes: Detecting whether an abnormality occurs in the transformer module according to the current value of the current transformer and / or the voltage value of the voltage transformer; If any transformer module fails and the current mode is group mode, the current mode is switched to standby mode. If any transformer module is abnormal and the current mode is the standby mode, the current mode is kept as the standby mode, and the transformer module with the abnormality is controlled to stop running, and the remaining transformer modules are controlled to continue running; If the abnormal transformer module returns to normal and the current mode is the standby mode, the current mode is switched to the grouping mode.

4. The control method according to any one of claims 1 to 3, It is characterized in that The control method further comprises: Detecting whether the transformer module is overloaded; When any transformer module is overloaded, the load connected to the busbar connected to the transformer module or the busbar segment is cut off according to the overload amount.

5. The control method according to claim 4, It is characterized in that The method further comprises: When it is detected that any transformer module is overloaded, the bus connected to the transformer module or other transformer modules connected to the bus segment are locked.

6. The control method according to claim 4, It is characterized in that The method of cutting off the bus connected to the transformer module or the load connected to the bus segment according to the overload specifically includes: According to the overload amount, in order of the load protection priority from low to high, the bus connected to the transformer module or the load connected to the bus segment is cut off.

7. A control device for a power supply system, It is characterized in that The power supply system comprises: a main transformer module, a standby transformer module, a bus and a load connected to the bus, wherein at least one section switch is arranged on the bus; the control device comprises: A receiving module, used for receiving a mode instruction, wherein the mode instruction is used for indicating a standby mode or a grouping mode; A control module, configured to control the section switch to be turned on, and control the main transformer module to continue to operate and control the standby transformer module to stop operating if the mode instruction indicates a standby mode; wherein the total rated capacity of the main transformer modules is not less than the total maximum demand of the loads; The control module is also used to control the segment switch to be disconnected if the mode instruction indicates a grouping mode, so as to divide the bus into multiple bus segments; and to group the main transformer module and the standby transformer module to obtain a transformer group corresponding to each bus segment, and control the transformer modules under the transformer group to operate continuously; wherein the sum of the rated capacities of the transformer modules under each transformer group is not less than the sum of the maximum demands of the loads under the corresponding bus segment.

8. An electronic device, It is characterized in that include: A processor, and a memory connected to the processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory to implement the method according to any one of claims 1 to 6.

9. A computer-readable storage medium, It is characterized in that The computer-readable storage medium stores computer-executable instructions, which are used to implement the method according to any one of claims 1 to 6 when executed by a processor.

10. A computer program product, It is characterized in that The invention comprises a computer program, which implements the method according to any one of claims 1 to 6 when being executed by a processor.

11. A substation, It is characterized in that comprising a power supply system and a control device as claimed in claim 7 or an electronic device as claimed in claim 8; The power supply system comprises: a main transformer module, a standby transformer module, a bus bar and a load connected to the bus bar, wherein at least one section switch is arranged on the bus bar.

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