Voltage regulation method, apparatus and device

Abstract

The embodiment of the present application provides a voltage regulation method, device and equipment. The method is applied to a multi-stage substation, and the multi-stage substation comprises busbars and transformers respectively. The method comprises the following steps: in response to the fact that the voltage of the busbar of the highest voltage level does not satisfy a first preset voltage range, performing first voltage regulation through the busbar of the highest voltage level; and in response to the fact that the voltage of the busbar of the highest voltage level obtained through the first voltage regulation result does not satisfy the first preset voltage range, adjusting the reactive power loss of at least one other stage substation according to the power factor of the transformer of the at least one other stage substation, so as to adjust the voltage of the busbar of the highest voltage level to be within the first preset voltage range. The method is used to achieve the effect of accurately regulating the voltage of the busbar in the multi-stage substation.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and in particular to a voltage regulation method, apparatus and equipment. Background Technology

[0002] In a power grid system, when the bus voltage of a substation is too high or too low, the substation adjusts the bus voltage to a qualified range to ensure the stable operation of the power grid system.

[0003] In related technologies, each substation adjusts its voltage based on the voltage conditions of its own busbar. During voltage regulation, the impact of adjusting the busbar voltage at one substation on the busbar voltages of other substations is not considered.

[0004] In related technologies, when each substation adjusts its voltage based on its own voltage conditions, it affects the bus voltage of other related substations, leading to inaccurate bus voltage regulation of substations in the power grid system. Therefore, improving the accuracy of bus voltage regulation in substations within the power grid system has become an urgent problem to be solved. Summary of the Invention

[0005] This application provides a voltage regulation method, apparatus, and equipment to achieve precise regulation of the bus voltage in a multi-level substation.

[0006] In a first aspect, embodiments of this application provide a voltage regulation method applied to a multi-level substation, wherein the multi-level substation includes a busbar and a transformer; the method includes:

[0007] In response to the voltage of the highest voltage level bus not meeting the first preset voltage range, the first voltage regulation is performed through the highest voltage level bus.

[0008] In response to the fact that the voltage of the highest voltage level bus obtained from the first voltage regulation result does not meet the first preset voltage range, the reactive power loss of the at least one other level substation is adjusted according to the power factor of the transformer of the at least one other level substation, so as to adjust the voltage of the highest voltage level bus to the first preset voltage range.

[0009] In one possible implementation, adjusting the reactive power loss of the at least one other level substation based on the power factor of the transformer of the at least one other level substation includes:

[0010] For each of the other substations of the at least one other level, perform the following reactive power loss adjustment operation:

[0011] Maintain the bus voltage of the other substation at the corresponding second preset voltage range, or adjust the bus voltage of the other substation at the corresponding second preset voltage range;

[0012] If the reactive power of the transformer in the other substation meets the first preset condition, and it is determined that the power factor of the transformer is less than the lower limit of the first preset factor range, the reactive power compensation module is switched on the bus of the other substation to perform the second voltage regulation corresponding to the other substation.

[0013] If, after the second voltage adjustment of each of the other substations, it is determined that the voltage of the highest voltage level bus meets the first preset voltage range, the reactive power loss adjustment operation is stopped.

[0014] Otherwise, lower the lower limit of the first preset factor range and repeat the reactive power loss adjustment operation until the second preset condition is met.

[0015] In one possible implementation, the method further includes: in response to determining that the reactive power of the transformer of the other level substation does not meet the first preset condition, switching on a reactive power compensation module on the bus of the other level substation.

[0016] In one possible implementation, the second preset condition includes at least one of the following:

[0017] The voltage of the highest voltage level bus is adjusted to the first preset voltage range by the reactive power loss adjustment operation;

[0018] After lowering the lower limit of the first preset factor range, the lower limit of the first preset factor range no longer meets the preset lower limit condition.

[0019] Even after adjusting the transformer's turns ratio, it is impossible to guarantee that the bus voltage of other substations will remain within the second preset voltage range.

[0020] In one possible implementation, adjusting the bus voltage of the other substation to the second preset voltage range includes:

[0021] In response to the detection that the bus voltage of the other substation is not within the second preset voltage range, the transformer ratio of the other substation is adjusted so that the bus voltage of the other substation is adjusted to the second preset voltage range.

[0022] In one possible implementation, the reactive power compensation module includes a capacitor bank and a reactor bank.

[0023] In one possible implementation, the first voltage regulation via the highest voltage level bus includes:

[0024] The first voltage regulation is performed by switching at least one capacitor bank or reactor bank on the highest voltage level bus.

[0025] In one possible implementation, the first voltage regulation by switching at least one capacitor bank or reactor bank on the highest voltage level bus includes:

[0026] If the voltage of the highest voltage level bus is higher than the first preset voltage range, cut off at least one existing capacitor bank on the highest voltage level bus and / or add at least one reactor bank to the highest voltage level bus.

[0027] If the voltage of the highest voltage level bus is lower than the first preset voltage range, at least one existing reactor group on the highest voltage level bus is disconnected, and / or at least one capacitor group is connected to the highest voltage level bus.

[0028] Secondly, embodiments of this application provide a voltage regulation device applied to a multi-level substation, wherein the multi-level substation includes a busbar and a transformer; the device includes:

[0029] The first adjustment module is used to adjust the first voltage through the highest voltage level bus in response to the voltage of the highest voltage level bus not meeting the first preset voltage range.

[0030] The second adjustment module is used to adjust the reactive power loss of the at least one other level substation according to the power factor of the transformer of the at least one other level substation in response to the voltage of the highest voltage level bus obtained by the first voltage adjustment result not meeting the first preset voltage range, so as to adjust the voltage of the highest voltage level bus to the first preset voltage range.

[0031] Thirdly, embodiments of this application provide a voltage regulation device, including: a memory and a processor;

[0032] The memory stores computer-executed instructions;

[0033] The processor executes computer execution instructions stored in the memory, causing the processor to perform the first aspect and / or various possible implementations of the first aspect as described above.

[0034] Fourthly, embodiments of this application provide a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement the first aspect and / or various possible implementations of the first aspect.

[0035] Fifthly, embodiments of this application provide a computer program product, including a computer program that, when executed by a processor, implements the first aspect and / or various possible implementations of the first aspect.

[0036] The voltage regulation method, apparatus, and equipment provided in this application first regulate the voltage of the highest voltage level bus in a multi-level substation when the voltage is outside the preset voltage range. If the voltage of the highest voltage level bus is still outside the preset voltage range after regulation, the reactive power loss of at least one other level substation is adjusted according to the power factor of the transformers of at least one other level substation, thereby regulating the voltage of the highest voltage level bus to the preset voltage range. By activating the voltage regulation strategy of the highest voltage level bus itself, and activating the linkage voltage regulation strategy of other level substations when voltage regulation fails, the accuracy of bus voltage regulation in multi-level substations is improved. Attached Figure Description

[0037] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0038] Figure 1 A schematic flowchart of the voltage regulation method provided in this application;

[0039] Figure 2 A schematic diagram of the voltage regulation device provided in this application;

[0040] Figure 3 A schematic diagram of the voltage regulation device provided in this application.

[0041] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0042] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0043] In some areas supplied by the power grid, electricity load varies significantly across different time periods. Electricity load is high during weekdays and low on weekends. Therefore, the peak and trough loads in these areas result in distinct peak and trough characteristics, leading to large voltage fluctuations. Both excessively high and low voltages can affect the stable operation of the power grid system. Therefore, it is necessary to adjust the voltage to a suitable range to ensure the stable operation of the power grid system.

[0044] Related technologies regulate voltage. Each substation in a multi-level substation system adjusts the voltage of its subordinate busbars based on its own voltage conditions by switching capacitor banks, reactor banks, or adjusting the transformer turns ratio. By connecting capacitors to the busbar, reactive power can be added to the grid system, thereby increasing the busbar voltage; by disconnecting the connected capacitor banks, the busbar voltage can be decreased. Similarly, by connecting reactor banks to the busbar, reactive power from the grid system can be absorbed, thus decreasing the busbar voltage; by disconnecting the connected reactor banks, the busbar voltage can be increased. Decreasing the transformer turns ratio increases the voltage of the busbar connected to that transformer, while increasing the transformer turns ratio decreases the voltage of the busbar connected to that transformer.

[0045] For a power grid system including multiple substations, such as a system comprising 500kV busbars, 500kV transformers, 220kV busbars, 110kV busbars, 110kV transformers, and 10kV busbars, one transformer configuration might be as follows: a 500kV transformer transforms to a 500kV busbar at the high level, a 220kV busbar at the intermediate level, and a 35kV busbar at the low level; a 220kV transformer transforms to a 220kV busbar at the high level, a 110kV busbar at the intermediate level, and a 10kV busbar at the low level; or a 110kV transformer transforms to a 110kV busbar at the high level and a 10kV busbar at the low level. A 500kV transformer has capacitor banks and reactor banks connected to its intermediate or low-voltage busbar. The voltage on the busbar can be adjusted by switching the capacitor banks and reactor banks on the busbar. A 220kV transformer has capacitor banks and reactor banks connected to its intermediate or low-voltage busbar, and a 110kV transformer has capacitor banks and reactor banks connected to its low-voltage busbar. The voltage on the busbar can be adjusted by switching the capacitor banks and reactor banks on the busbar. At the same time, the busbar voltage can also be adjusted by adjusting the turns ratio of the 220kV transformer or the 110kV transformer.

[0046] For a power grid system that includes 500kV busbars, 500kV transformers, 220kV busbars, 220kV transformers, 110kV busbars, 110kV transformers, and 10kV busbars, since each substation adjusts the voltage based on its own voltage conditions, if the voltage input from the 500kV busbar (the highest voltage level busbar) to the 550kV transformer is not within the acceptable range, even after switching on and off the capacitor banks and reactor banks of each level of busbar connected to the 550kV transformer, the voltage of the highest voltage level busbar is still not within the acceptable range. In this case, it is impossible to adjust the voltage of the highest voltage level busbar to the acceptable range through other means.

[0047] Based on the above analysis, it can be concluded that when the relevant technologies regulate the bus voltage in the power grid system, there is a technical problem of inaccurate bus voltage regulation.

[0048] The voltage regulation method, apparatus, and equipment provided in this application are intended to solve the above-mentioned problems existing in related technologies.

[0049] The technical solution of this application and how it solves the above-mentioned technical problems will be described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will be described below with reference to the accompanying drawings.

[0050] Figure 1 This is a flowchart illustrating the voltage regulation method provided in this application, applied to multi-level substations, where each substation includes a busbar and a transformer, such as... Figure 1 As shown, the method includes:

[0051] S101. In response to the voltage of the highest voltage level bus not meeting the first preset voltage range, the first voltage regulation is performed through the highest voltage level bus.

[0052] It should be noted that setting the voltage of the highest voltage level bus within the first preset voltage range can ensure the stable operation of the power grid system and reduce potential problems caused by excessively high or low bus voltage.

[0053] The first voltage regulation method can be based on the existing voltage regulation method of the substation.

[0054] S102. In response to the fact that the voltage of the highest voltage level bus obtained from the first voltage regulation result does not meet the first preset voltage range, the reactive power loss of at least one other level substation is adjusted according to the power factor of the transformer of at least one other level substation, so as to adjust the voltage of the highest voltage level bus to the first preset voltage range.

[0055] It should be noted that the power of a transformer is divided into apparent power S, active power P, and reactive power Q. S, P, and Q satisfy the following formula (1):

[0056] (1);

[0057] The power factor C of a transformer can be calculated using the active power P and apparent power using the following formula (2):

[0058] (2);

[0059] The power factor C is used to measure the effective utilization rate of input power. The value of the power factor C can be a number between A and 1, where A is greater than 0 and less than 1. For 220kV and 110kV transformers, in order to ensure the effective utilization rate of input power, the power factor C is generally greater than 0.85, that is, the value of A is generally greater than 0.85.

[0060] When the voltage of the highest voltage level bus obtained by the first voltage regulation result does not meet the first preset voltage range, the reactive power loss of at least one other level substation is adjusted according to the power factor of the transformer of at least one other level substation to initiate the linkage voltage regulation of other level substations. The timing of the initiation of the linkage voltage regulation of each other level substation is not sequential, and the linkage voltage regulation of each other level substation is independent of each other.

[0061] To make the voltage of the highest voltage level bus more stable after regulation, i.e. to avoid frequent voltage adjustments, when adjusting the voltage of the highest voltage level bus to the first preset voltage range, the voltage of the highest voltage level bus can be adjusted to a sub-range of the first preset voltage range.

[0062] As an example, if the first preset voltage range is U1 to U2, the voltage of the highest voltage level bus can be adjusted to U3 to U4, where U1, U2, U3, and U4 satisfy U1. <U3<U4<U2。

[0063] The voltage regulation method provided in this application first regulates the voltage of the highest voltage level bus in a multi-level substation when the voltage is outside the preset voltage range. If the voltage of the highest voltage level bus is still outside the preset voltage range after regulation, the reactive power loss of at least one other level substation is adjusted according to the power factor of the transformers of at least one other level substation, thereby regulating the voltage of the highest voltage level bus to the preset voltage range. By activating the voltage regulation strategy of the highest voltage level bus itself, and activating the linkage voltage regulation strategy of other level substations when voltage regulation fails, the accuracy of bus voltage regulation in multi-level substations is improved.

[0064] The following example, using the regulation of bus voltage in a power grid system including 500kV busbars, 500kV transformers, 220kV busbars, 220kV transformers, 110kV busbars, 110kV transformers, and 10kV busbars, further illustrates the technical solution of this application.

[0065] In some embodiments, step S102, adjusting the reactive power loss of at least one other level substation based on the power factor of the transformer of at least one other level substation, includes:

[0066] For each of the other substations of at least one other level, perform the following reactive power loss adjustment operations:

[0067] First, maintain the bus voltage of the other substation at the corresponding second preset voltage range, or adjust the bus voltage of the other substation at the corresponding second preset voltage range.

[0068] Second, if the reactive power of the transformer in the other substation meets the first preset condition, and it is determined that the power factor of the transformer is less than the lower limit of the first preset factor range, the reactive power compensation module is switched on the bus of the other substation to perform the second voltage regulation corresponding to the other substation.

[0069] Third, if, after the second voltage adjustment of other substations, it is determined that the voltage of the highest voltage bus meets the first preset voltage range, the reactive power loss adjustment operation shall be stopped.

[0070] Fourth, otherwise, lower the lower limit of the first preset factor range and repeat the reactive power loss adjustment operation until the second preset condition is met.

[0071] In some implementations of these embodiments, the method further includes:

[0072] Fifth, in response to the determination that the reactive power of the transformer of the other level substation does not meet the first preset condition, the reactive power compensation module is switched on the bus of the other level substation.

[0073] In some implementations of these embodiments, the second preset condition includes at least one of the following:

[0074] The voltage of the highest voltage bus is adjusted to the first preset voltage range by adjusting the reactive power loss.

[0075] After lowering the lower limit of the first preset factor range, the lower limit of the first preset factor range no longer meets the preset lower limit condition.

[0076] Even after adjusting the transformer's turns ratio, it is impossible to guarantee that the bus voltage of other substations will remain within the second preset voltage range.

[0077] It should be noted that the reactive power compensation module adjusts the reactive power loss in the power grid system by supplementing or absorbing reactive power, thereby regulating the voltage of each bus in the power grid system.

[0078] As an example, a reactive power compensation module includes capacitor banks and reactor banks.

[0079] In the first step, setting the voltage of the busbars of other substations within the second preset voltage range can ensure the stable operation of the power grid system and reduce potential operational risks to the power grid system caused by excessively high or low busbar voltage.

[0080] The bus voltage of other substations can be maintained within a second preset range by adjusting the transformer's turns ratio. Specifically, adjusting the bus voltage of these other substations to the second preset voltage range includes:

[0081] In response to the detection that the bus voltage of the other substation is not within the second preset voltage range, the transformer ratio of the other substation is adjusted to bring the bus voltage of the other substation within the second preset voltage range.

[0082] By adjusting the transformer's turns ratio, the bus voltage of the other substations can be maintained within the second preset voltage range. Subsequent coordinated voltage regulation operations can then be performed, provided that the bus voltage regulation of the other substations is deemed satisfactory.

[0083] The preset factor range can be from A to 1, where the value of A is greater than the preset lower limit condition.

[0084] As an example, the preset factor range can be from 0.95 to 1, and the preset lower limit condition is that A is greater than or equal to 0.85.

[0085] As an example, if the voltage of the 550kV bus (the highest voltage level bus) exceeds the first preset voltage range, the linkage voltage regulation of at least one other level substation associated with the 550kV bus will be initiated.

[0086] For each of the other substations of at least one other level associated with this 550kV busbar, perform the following reactive power loss adjustment operations:

[0087] An example is given of a 110kV busbar associated with the 550kV busbar, which is derived from a 220kV transformer.

[0088] Step 11: Determine if the voltage of the 110kV bus is within the second preset voltage range. If it is higher than the second preset voltage range, adjust the turns ratio of the 220kV transformer to lower the voltage of the 110kV bus until the voltage of the 110kV bus is adjusted to the second preset voltage range. If the voltage of the 110kV bus cannot be adjusted to the second preset voltage range by adjusting the turns ratio of the 220kV transformer, exit this round of reactive power loss adjustment operation.

[0089] Step 12: The first preset condition is to determine whether the reactive power of the 220kV transformer is less than or equal to zero. If the reactive power of the 220kV transformer is less than or equal to zero, proceed to step 13; otherwise, proceed to step 16.

[0090] Step 13: Determine whether the power factor of the 220kV transformer is less than the lower limit of the first preset factor range. If the power factor of the 220kV transformer is less than the lower limit of the first preset factor range, proceed to step 14; otherwise, proceed to step 15.

[0091] Step 14: Disconnect one reactor bank or connect one capacitor bank on the 110kV bus. If, after this switching operation, the power factor of the 220kV transformer is within the first preset factor range, or the 550kV bus voltage is within the first preset voltage range, or all reactor banks have been disconnected and all capacitor banks have been connected, then this round of reactive power loss adjustment operation is terminated; if the reactive power of the 220kV transformer is greater than zero, then this switching operation is cancelled, and this round of reactive power loss adjustment operation is terminated.

[0092] Step 15: If the power factor of the 220kV transformer is greater than or equal to the lower limit of the first preset factor range, then the 220kV transformer and the 220kV bus do not need to perform linkage voltage regulation.

[0093] Step 16: If the reactive power of the 220kV transformer does not meet the first preset condition, i.e., the reactive power of the 220kV transformer is greater than zero, then disconnect a capacitor bank or connect a reactor bank on the 220kV bus. If, after this switching operation, the reactive power of the 220kV transformer is less than or equal to zero, or the 550kV bus voltage is within the first preset voltage range, or all capacitor banks have been disconnected and all reactor banks have been connected, then this round of reactive power loss adjustment operation is terminated.

[0094] After this round of reactive power loss adjustment is completed, if the 550kV bus voltage still exceeds the first preset voltage range, the lower limit of the first preset factor range will be lowered (for example, the lower limit of the first preset factor range can be lowered by 3%). If, after lowering the lower limit of the first preset factor range, the lower limit does not meet the preset lower limit condition (for example, the lower limit is less than 0.85), the current voltage adjustment will end; otherwise, the next round of reactive power loss adjustment will continue. If the 550kV bus voltage is within the first preset voltage range, or if adjusting the transformer ratios of all other substations fails to bring the voltage of any downstream bus connected to any transformer to the acceptable range, the current voltage adjustment will end; otherwise, the next round of reactive power loss adjustment will continue.

[0095] As an example, if the voltage of the 550kV bus (the highest voltage level bus) is lower than the first preset voltage range, the linkage voltage regulation of at least one other level substation associated with the 550kV bus will be initiated.

[0096] For each of the other substations of at least one other level associated with this 550kV busbar, perform the following reactive power loss adjustment operations:

[0097] An example is given of a 110kV busbar associated with the 550kV busbar, which is derived from a 220kV transformer.

[0098] Step 21: Determine if the voltage of the 110kV bus is within the second preset voltage range. If it is below the second preset voltage range, adjust the turns ratio of the 220kV transformer to increase the voltage of the 110kV bus until the voltage of the 110kV bus is adjusted to the second preset voltage range. If the voltage of the 110kV bus cannot be adjusted to the second preset voltage range by adjusting the turns ratio of the 220kV transformer, exit the next round of reactive power loss adjustment operation.

[0099] Step 22: The first preset condition is to determine whether the reactive power of the 220kV transformer is greater than or equal to zero. If the reactive power of the 220kV transformer is greater than or equal to zero, proceed to step 23; otherwise, proceed to step 26.

[0100] Step 23: Determine whether the power factor of the 220kV transformer is less than the lower limit of the first preset factor range. If the power factor of the 220kV transformer is less than the lower limit of the first preset factor range, proceed to step 24; otherwise, proceed to step 25.

[0101] Step 24: Disconnect one capacitor bank or connect one reactor bank on the 110kV bus. If, after this switching operation, the power factor of the 220kV transformer is within the first preset factor range, or the 550kV bus voltage is within the first preset voltage range, or all capacitor banks have been disconnected and all reactor banks have been connected, exit this round of reactive power loss adjustment operation; if the reactive power of the 220kV transformer is less than zero, then cancel this switching operation and exit this round of reactive power loss adjustment operation.

[0102] Step 25: If the power factor of the 220kV transformer is greater than or equal to the lower limit of the first preset factor range, then the 220kV transformer and the 220kV bus do not need to perform linkage voltage regulation.

[0103] Step 26: If the reactive power of the 220kV transformer does not meet the first preset condition, i.e., the reactive power of the 220kV transformer is less than zero, then disconnect a reactor group or connect a capacitor group on the 220kV bus. If, after this switching operation, the reactive power of the 220kV transformer is greater than or equal to zero, or the 550kV bus voltage is within the first preset voltage range, or all reactor groups have been disconnected and all capacitor groups have been connected, then exit this round of reactive power loss adjustment operation.

[0104] After this round of reactive power loss adjustment is completed, if the 550kV bus voltage is still lower than the first preset voltage range, the lower limit of the first preset factor range will be lowered (for example, the lower limit of the first preset factor range can be lowered by 3%). If, after lowering the lower limit of the first preset factor range, the lower limit does not meet the preset lower limit condition (for example, the lower limit is less than 0.85), the current voltage adjustment will end; otherwise, the next round of reactive power loss adjustment will continue. If the 550kV bus voltage is within the first preset voltage range, or if adjusting the transformer ratios of all other substations fails to bring the voltage of any downstream bus connected to any transformer to the acceptable range, the current voltage adjustment will end; otherwise, the next round of reactive power loss adjustment will continue.

[0105] In these embodiments, when the voltage of the highest voltage level bus exceeds or falls below a first preset range, the voltage regulation of the highest voltage level bus is adjusted by initiating the linkage voltage regulation of at least one other level substation associated with the highest voltage level bus, while ensuring that the voltage of each bus under the other level substation is qualified, so that the voltage of the highest voltage level bus is also adjusted to the qualified range.

[0106] In some implementations of these embodiments, first voltage regulation is performed via the highest voltage level bus, including:

[0107] The first voltage regulation is achieved by switching at least one capacitor bank or reactor bank on the highest voltage level bus.

[0108] Specifically, the first voltage regulation is performed by switching at least one capacitor bank or reactor bank on the highest voltage level bus, including:

[0109] If the voltage of the highest voltage level bus is higher than the first preset voltage range, cut off at least one existing capacitor bank on the highest voltage level bus and / or add at least one reactor bank to the highest voltage level bus.

[0110] If the voltage of the highest voltage level bus is lower than the first preset voltage range, at least one existing reactor group on the highest voltage level bus is disconnected, and / or at least one capacitor group is connected to the highest voltage level bus.

[0111] As an example, if the voltage of the 550kV bus (the highest voltage level bus) is higher than the first preset voltage range, and if multiple capacitor banks are already in operation on the 550kV bus, then the capacitor banks are disconnected one by one until no capacitor banks can be disconnected, or the voltage of the 550kV bus is within the first preset voltage range.

[0112] If there are multiple reactor groups available to be put into operation on the 550kV bus, the reactor groups will be put into operation one by one until no reactor groups are available to be put into operation, or the voltage of the 550kV bus is within the first preset voltage range.

[0113] If the voltage of the 550kV bus is lower than the first preset voltage range, and if multiple reactor groups are already in operation on the 550kV bus, then the reactor groups will be disconnected one by one until no reactor groups can be disconnected, or the voltage of the 550kV bus is within the first preset voltage range.

[0114] If there are multiple capacitor banks available to be connected on the 550kV bus, the capacitor banks will be connected one by one until no capacitor banks are available to be connected, or the voltage of the 550kV bus is within the first preset voltage range.

[0115] In these implementations, the voltage regulation strategy of this substation is prioritized by switching reactive power compensation modules on the highest voltage level bus to regulate the voltage of the highest voltage level bus to a first preset voltage range. If the voltage regulation strategy of this substation has been completed but the voltage of the highest voltage level bus still cannot be guaranteed to be within the acceptable range, then the coordinated voltage regulation of other related substations is initiated. This allows for the regulation of the bus voltages in the power grid system in the fastest possible time while minimizing the impact on other buses in the power grid system.

[0116] It should be noted that in these implementations, when switching reactive power compensation modules, defective or under-repair reactive power compensation modules are not switched.

[0117] Figure 2This is a schematic diagram of the voltage regulating device provided in this application. The voltage regulating device is applied to a multi-level substation, which includes a busbar and a transformer, respectively. Figure 2 As shown, the voltage regulation device 20 provided in this embodiment includes:

[0118] The first adjustment module 201 is used to perform a first voltage adjustment through the highest voltage level bus in response to the voltage of the highest voltage level bus not meeting the first preset voltage range.

[0119] The second adjustment module 202 is used to adjust the reactive power loss of at least one other level substation according to the power factor of the transformer of at least one other level substation in response to the voltage of the highest voltage level bus obtained by the first voltage adjustment result not meeting the first preset voltage range, so as to adjust the voltage of the highest voltage level bus to the first preset voltage range.

[0120] In some embodiments, the second adjustment module 202 is further configured to:

[0121] For each of the other substations of at least one other level, perform the following reactive power loss adjustment operations:

[0122] Maintain the bus voltage of the other substation at the corresponding second preset voltage range, or adjust the bus voltage of the other substation at the corresponding second preset voltage range;

[0123] If the reactive power of the transformer in the other substation meets the first preset condition, and it is determined that the power factor of the transformer is less than the lower limit of the first preset factor range, the reactive power compensation module is switched on the bus of the other substation to perform the second voltage regulation corresponding to the other substation.

[0124] If, after the second voltage adjustment of each of the other substations, it is determined that the voltage of the highest voltage bus meets the first preset voltage range, the reactive power loss adjustment operation is stopped.

[0125] Otherwise, lower the lower limit of the first preset factor range and repeat the reactive power loss adjustment operation until the second preset condition is met.

[0126] In some embodiments of these examples, the second adjustment module 202 is further configured to:

[0127] In response to the determination that the reactive power of the transformer of the other level substation does not meet the first preset condition, a reactive power compensation module is switched on the bus of the other level substation.

[0128] In some implementations of these embodiments, the second preset condition includes at least one of the following:

[0129] The voltage of the highest voltage level bus is adjusted to the first preset voltage range by adjusting the reactive power loss.

[0130] After lowering the lower limit of the first preset factor range, the lower limit of the first preset factor range no longer meets the preset lower limit condition.

[0131] Even after adjusting the transformer's turns ratio, it is impossible to guarantee that the bus voltage of other substations will remain within the second preset voltage range.

[0132] In some embodiments of these examples, the second adjustment module 202 is further configured to:

[0133] In response to the detection that the bus voltage of the other substation is not within the second preset voltage range, the transformer ratio of the other substation is adjusted to bring the bus voltage of the other substation within the second preset voltage range.

[0134] In some implementations of these embodiments, the reactive power compensation module includes a capacitor bank and a reactor bank.

[0135] In some implementations of these embodiments, the first adjustment module 201 is further configured to:

[0136] The first voltage regulation is achieved by switching at least one capacitor bank or reactor bank on the highest voltage level bus.

[0137] In some implementations of these embodiments, the first adjustment module 201 is further configured to:

[0138] If the voltage of the highest voltage level bus is higher than the first preset voltage range, cut off at least one existing capacitor bank on the highest voltage level bus and / or add at least one reactor bank to the highest voltage level bus.

[0139] If the voltage of the highest voltage level bus is lower than the first preset voltage range, at least one existing reactor group on the highest voltage level bus is disconnected, and / or at least one capacitor group is connected to the highest voltage level bus.

[0140] The voltage regulation device provided in this embodiment can execute the method provided in the above method embodiment. Its implementation principle and technical effect are similar, and will not be described in detail here.

[0141] Figure 3 A schematic diagram of the voltage regulation device provided in this application. Figure 3 As shown, the electronic device 30 provided in this embodiment includes at least one processor 301 and a memory 302. Optionally, the device 30 further includes a communication component 303. The processor 301, memory 302, and communication component 303 are connected via a bus 304.

[0142] In a specific implementation, at least one processor 301 executes computer execution instructions stored in memory 302, causing at least one processor 301 to perform the above-described method.

[0143] The specific implementation process of processor 301 can be found in the above method embodiments, and its implementation principle and technical effect are similar. It will not be repeated here.

[0144] In the above embodiments, it should be understood that the processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), etc. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in this invention can be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules within the processor.

[0145] The memory may include random access memory (RAM) and may also include non-volatile memory (NVM), such as at least one disk storage device.

[0146] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of illustration, the buses shown in the accompanying drawings are not limited to a single bus or a single type of bus.

[0147] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described method.

[0148] This application also provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the above-described method.

[0149] The aforementioned readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The readable storage medium can be any available medium accessible to a general-purpose or special-purpose computer.

[0150] An exemplary readable storage medium is coupled to a processor, enabling the processor to read information from and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can reside in an Application Specific Integrated Circuit (ASIC). Alternatively, the processor and the readable storage medium can exist as discrete components in the device.

[0151] The division of units is merely a logical functional division; in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices, or units, and may be electrical, mechanical, or other forms.

[0152] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0153] In addition, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0154] If a function is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0155] Those skilled in the art will understand that all or part of the steps of the above-described method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0156] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A voltage regulation method applied to a multi-level substation, wherein the multi-level substation includes a busbar and a transformer respectively; the method includes: In response to the voltage of the highest voltage level bus not meeting the first preset voltage range, the first voltage regulation is performed through the highest voltage level bus. In response to the voltage of the highest voltage level bus obtained from the first voltage regulation result not meeting the first preset voltage range, the reactive power loss of at least one other level substation is adjusted according to the power factor of the transformers of at least one other level substation, so as to adjust the voltage of the highest voltage level bus to the first preset voltage range; wherein, The adjustment of reactive power loss of at least one other level substation based on the power factor of the transformer of at least one other level substation includes: For each of the other substations of the at least one other level, perform the following reactive power loss adjustment operation: Maintain the bus voltage of the other substation at the corresponding second preset voltage range, or adjust the bus voltage of the other substation at the corresponding second preset voltage range; If the reactive power of the transformer in the other substation meets the first preset condition, and it is determined that the power factor of the transformer is less than the lower limit of the first preset factor range, the reactive power compensation module is switched on the bus of the other substation to perform the second voltage regulation corresponding to the other substation. If, after the second voltage adjustment of each of the other substations, it is determined that the voltage of the highest voltage level bus meets the first preset voltage range, the reactive power loss adjustment operation is stopped. Otherwise, lower the lower limit of the first preset factor range and repeat the reactive power loss adjustment operation until the second preset condition is met.

2. The method according to claim 1, characterized in that, The method further includes: in response to determining that the reactive power of the transformer of the other level substation does not meet the first preset condition, switching on the reactive power compensation module on the bus of the other level substation.

3. The method according to claim 1, characterized in that, The second preset condition includes at least one of the following: The voltage of the highest voltage level bus is adjusted to the first preset voltage range by the reactive power loss adjustment operation; After lowering the lower limit of the first preset factor range, the lower limit of the first preset factor range no longer meets the preset lower limit condition. Even after adjusting the transformer's turns ratio, it is impossible to guarantee that the bus voltage of other substations will remain within the second preset voltage range.

4. The method according to claim 1, characterized in that, Adjusting the bus voltage of the other substation to the second preset voltage range includes: In response to the detection that the bus voltage of the other substation is not within the second preset voltage range, the transformer ratio of the other substation is adjusted so that the bus voltage of the other substation is adjusted to the second preset voltage range.

5. The method according to any one of claims 1-4, characterized in that, The reactive power compensation module includes a capacitor bank and a reactor bank.

6. The method according to claim 5, characterized in that, The first voltage regulation via the highest voltage level bus includes: The first voltage regulation is performed by switching at least one capacitor bank or reactor bank on the highest voltage level bus.

7. The method according to claim 6, characterized in that, The first voltage regulation, achieved by switching at least one capacitor bank or reactor bank on the highest voltage level bus, includes: If the voltage of the highest voltage level bus is higher than the first preset voltage range, cut off at least one existing capacitor bank on the highest voltage level bus and / or add at least one reactor bank to the highest voltage level bus. If the voltage of the highest voltage level bus is lower than the first preset voltage range, at least one existing reactor group on the highest voltage level bus is disconnected, and / or at least one capacitor group is connected to the highest voltage level bus.

8. A voltage regulating device applied to a multi-level substation, wherein each multi-level substation includes a busbar and a transformer; the device comprises: The first adjustment module is used to adjust the first voltage through the highest voltage level bus in response to the voltage of the highest voltage level bus not meeting the first preset voltage range. The second adjustment module is configured to, in response to the voltage of the highest voltage level bus obtained from the first voltage adjustment result not meeting the first preset voltage range, adjust the reactive power loss of the at least one other-level substation according to the power factor of the transformer of the at least one other-level substation, so as to adjust the voltage of the highest voltage level bus to the first preset voltage range; wherein, the adjustment of the reactive power loss of the at least one other-level substation according to the power factor of the transformer of the at least one other-level substation includes: for each other-level substation of the at least one other-level substation, performing the following reactive power loss adjustment operation: maintaining the bus voltage of the other-level substation at the corresponding second preset voltage. The voltage range is adjusted, or the bus voltage of the other substation is adjusted to the second preset voltage range; if the reactive power of the transformer of the other substation meets the first preset condition, and it is determined that the power factor of the transformer is less than the lower limit of the first preset factor range, the reactive power compensation module is switched on and off on the bus of the other substation to perform the second voltage adjustment corresponding to the other substation; if, after the second voltage adjustment of each of the other substations, it is determined that the voltage of the highest voltage level bus meets the first preset voltage range, the reactive power loss adjustment operation is stopped; otherwise, the lower limit of the first preset factor range is lowered, and the reactive power loss adjustment operation is repeated until the second preset condition is met.

9. A voltage regulating device, characterized in that, include: Memory, processor; The memory stores computer-executed instructions; The processor executes computer execution instructions stored in the memory, causing the processor to perform the method as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the method as described in any one of claims 1-7.

11. A computer program product, characterized in that, Includes a computer program that, when executed by a processor, implements the method described in any one of claims 1-7.

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