AVC regional reactive power auxiliary control method and device

Abstract

The present application discloses a reactive power auxiliary control method and device for an AVC area. The method includes: obtaining the first reactive power flow data on the medium voltage side of the target substation, and determining whether there is a reactive power surplus in the target voltage automatic control AVC area based on the data; the target AVC area includes multiple AVC substations, and the high voltage side bus of the AVC substation is connected to the medium voltage side of the target substation through the target interconnection line; if there is a reactive power surplus in the target AVC area, obtain the power factor and the second reactive power flow data of the target interconnection line, the low voltage side bus voltage and reactive power usage data of each AVC substation, and determine whether there is a reactive power surplus and reactive power regulation is required for each AVC substation based on these data; for the AVC substation with reactive power surplus and reactive power regulation, adjust the working state of its reactive power compensation device. The present application solves the technical problem that the flexibility of local reactive power regulation in the AVC area in the relevant reactive power control scheme is not high.

Description

Technical Field

[0001] The present application relates to the technical field of power system dispatching, and in particular to an AVC area reactive power auxiliary control method and device. Background Art

[0002] With the continuous expansion of the scale of power systems and the continuous improvement of the penetration rate of renewable energy, the reactive power and voltage control of power systems has become more and more complex, which has had a great impact on the safe and stable operation of power systems. The balance of reactive power in power systems plays a vital role in voltage quality, frequency quality, and improving line transmission capacity. The goal of reactive power control is mainly to meet the power system's demand for reactive power through the reasonable configuration of reactive power compensation equipment, while considering the principles of economy, safety, reliability, etc. to achieve reactive power balance on site.

[0003] At present, the technology of reactive power control is mainly divided into centralized reactive power control and hierarchical control. Centralized reactive power control coordinates all reactive devices in the system to achieve reactive power balance of the system. However, this method has problems such as long response time, poor coordination and complex control. Hierarchical control divides the system into multiple areas and adopts on-site balancing to reduce control complexity and control time. However, it lacks real-time monitoring of reactive power within the area, resulting in excess or shortage of reactive power in the area, which has a huge impact on the operation of the entire system.

[0004] To address the above-mentioned problems, no effective solution has been proposed yet. Summary of the invention

[0005] The embodiments of the present application provide an AVC area reactive power auxiliary control method and device to at least solve the technical problem of low flexibility in regulating local reactive power in the AVC area in related reactive power control schemes.

[0006] According to one aspect of an embodiment of the present application, a reactive power auxiliary control method for an AVC area is provided, comprising: obtaining first reactive power flow data on the medium voltage side of a target substation, and determining whether there is excess reactive power in a target voltage automatic control AVC area based on the first reactive power flow data, wherein the target AVC area includes multiple AVC substations, and the high voltage side bus of the AVC substation is connected to the medium voltage side of the target substation through a target interconnection line; in the case where there is excess reactive power in the target AVC area, obtaining the power factor and second reactive power flow data corresponding to the target interconnection line, the low voltage side bus voltage and reactive power usage data of each AVC substation, and determining whether there is excess reactive power and reactive power regulation is required for each AVC substation based on the power factor, the second reactive power flow data, the low voltage side bus voltage and the reactive power usage data; for each AVC substation, in the case where there is excess reactive power and reactive power regulation is required in the AVC substation, adjusting the working state of the reactive power compensation device in the AVC substation.

[0007] Optionally, first reactive power flow data on the medium voltage side of the target substation is obtained, and whether there is excess reactive power in the target AVC area is determined based on the first reactive power flow data, including: using a dispatching automation acquisition device to obtain a first reactive power at the medium voltage side switch of the target substation, wherein if the first reactive power is a negative value, it indicates that the first reactive power is output from the target substation to the target AVC area, and if the first reactive power is a positive value, it indicates that the first reactive power is input from the target AVC area to the target substation; comparing the first reactive power with a first preset threshold; and determining that there is excess reactive power in the target AVC area when the first reactive power is greater than the first preset threshold.

[0008] Optionally, the power factor and second reactive power flow data corresponding to the target interconnection line, the low-voltage bus voltage and reactive power usage data of each AVC substation are obtained, and based on the power factor, the second reactive power flow data, the low-voltage bus voltage and reactive power usage data, it is determined whether each AVC substation has excess reactive power and needs reactive power regulation, including: using the dispatching automation acquisition equipment to obtain the second reactive power and power factor on the target interconnection line, the low-voltage bus voltage and the consumed third reactive power of each AVC substation, wherein if the second reactive power is a negative value, it indicates that the second reactive power is output from the AVC substation to the target interconnection line, and if the second reactive power is a positive value, it indicates that the second reactive power is input from the target interconnection line to the AVC substation; for each AVC substation, determine the low voltage bus voltage of the AVC substation. Whether the high-voltage side bus voltage is within the preset qualified voltage range; when the low-voltage side bus voltage is within the qualified voltage range, compare the absolute value of the power factor with the second preset threshold; when the absolute value of the power factor is less than the second preset threshold, compare the second reactive power with the third preset threshold; when the second reactive power is less than the third preset threshold, determine the sum of the second reactive power and the third reactive power corresponding to the AVC substation, and determine the ratio of the absolute value of the second reactive power to the third reactive power, compare the sum with the fourth preset threshold, and compare the ratio with the fifth preset threshold; when the sum is less than the fourth preset threshold and the ratio is greater than the fifth preset threshold, determine that the AVC substation has excess reactive power and requires reactive power regulation.

[0009] Optionally, the reactive power compensation equipment in the AVC substation includes a capacitor group and a reactor group, and the method also includes: using the scheduling automation collection equipment to obtain the fourth reactive power at the low-voltage side switch of the AVC substation, wherein if the fourth reactive power is a negative value, it indicates that the fourth reactive power is output from the AVC substation, and if the second reactive power is a positive value, it indicates that the second reactive power is input into the AVC substation; when the capacitor group is put into operation and the reactor group is not put into operation, the third reactive power is determined to be the sum of the second reactive power, the fifth reactive power generated by the capacitor group, and the fourth reactive power; when the capacitor group is not put into operation and the reactor group is put into operation, the third reactive power is determined to be the sum of the second reactive power, the sixth reactive power consumed by the reactor group, and the fourth reactive power.

[0010] Optionally, the reactive power compensation equipment in the AVC substation includes a capacitor group and a reactor group, and adjusting the working state of the reactive power compensation equipment in the AVC substation includes: when the capacitor group is put into operation and the reactor group is not put into operation, reducing the number of capacitors put into operation in the capacitor group; when the capacitor group is not put into operation and the reactor group is put into operation, increasing the number of reactors put into operation in the reactor group.

[0011] Optionally, when there is no excess reactive power in the target AVC area, or the low-voltage side bus voltage is not within the qualified voltage range, or the absolute value of the power factor is not less than the second preset threshold, or the second reactive power is not less than the third preset threshold, or the sum is not less than the fourth preset threshold, or the ratio is not greater than the fifth preset threshold, the reactive power of the target AVC area is controlled according to the preset AVC area reactive power control strategy.

[0012] Optionally, the target substation is a 220kV substation, and the medium voltage side voltage of the target substation is 110kV; the high voltage side voltage of the AVC substation is 110kV, and the low voltage side voltage is 10kV.

[0013] According to another aspect of an embodiment of the present application, an AVC area reactive power auxiliary control device is also provided, including: a first judgment module, used to obtain first reactive power flow data on the medium voltage side of a target substation, and determine whether there is excess reactive power in the target AVC area based on the first reactive power flow data, wherein the target AVC area includes multiple AVC substations, and the high-voltage side bus of the AVC substation is connected to the medium voltage side of the target substation through a target interconnection line; a second judgment module, used to obtain the power factor and second reactive power flow data corresponding to the target interconnection line, the low-voltage side bus voltage and reactive usage data of each AVC substation when there is excess reactive power in the target AVC area, and determine whether there is excess reactive power and reactive power regulation is required for each AVC substation based on the power factor, the second reactive power flow data, the low-voltage side bus voltage and the reactive usage data; a reactive power regulation module, used to adjust the working state of the reactive power compensation device in the AVC substation for each AVC substation when there is excess reactive power and reactive power regulation is required in the AVC substation.

[0014] According to another aspect of an embodiment of the present application, a computer program product is further provided, the computer program product comprising: a computer program, wherein when the computer program is executed by a processor, the above-mentioned AVC area reactive power auxiliary control method is implemented.

[0015] According to another aspect of an embodiment of the present application, an electronic device is also provided, which includes: a memory and a processor, wherein a computer program is stored in the memory, and the processor is configured to execute the above-mentioned AVC area reactive power auxiliary control method through the computer program.

[0016] In an embodiment of the present application, first reactive power flow data on the medium voltage side of a target substation is obtained, and based on the first reactive power flow data, it is determined whether there is excess reactive power in a target voltage automatic control AVC area, wherein the target AVC area includes a plurality of AVC substations, and the high voltage side bus of the AVC substation is connected to the medium voltage side of the target substation through a target interconnection line; in the case where there is excess reactive power in the target AVC area, the power factor and second reactive power flow data corresponding to the target interconnection line, the low voltage side bus voltage and reactive power usage data of each AVC substation are obtained, and based on the power factor, the second reactive power flow data, the low voltage side bus voltage and reactive power usage data, it is determined whether there is excess reactive power and reactive power regulation is required for each AVC substation; for each AVC substation, in the case where there is excess reactive power and reactive power regulation is required in the AVC substation, the working state of the reactive power compensation device in the AVC substation is adjusted. In this way, real-time monitoring and adjustment of the reactive power of each AVC substation can avoid voltage fluctuations caused by excess or insufficient reactive power, thereby improving the stability of the entire power system and solving the technical problem of low flexibility in local reactive power regulation in the AVC area in related reactive power control schemes. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1 It is a flow chart of an optional AVC area reactive power auxiliary control method according to an embodiment of the present application;

[0019] Figure 2 is a schematic structural diagram of an optional AVC area reactive power auxiliary control area according to an embodiment of the present application;

[0020] Figure 3 is a schematic structural diagram of an optional AVC area reactive power auxiliary control device according to an embodiment of the present application;

[0021] Figure 4 It is a schematic diagram of the structure of an optional electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0023] It should be noted that the terms "first", "second", etc. in the specification, claims and drawings of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0024] In order to better understand the embodiments of the present application, some nouns or terms that appear in the description of the embodiments of the present application are first translated and explained as follows:

[0025] AVC: refers to the control area of ​​the Automatic Voltage Control (AVC) system in the power system. The AVC system is used to automatically adjust the reactive power and voltage of the power system to ensure the safe and stable operation of the power grid, improve the quality of power and reduce losses. The AVC area refers to the division of the entire power grid into several areas where voltage and reactive power control can be performed independently according to the power grid structure and technical requirements. These areas are usually determined based on the topological structure of the power grid and the electrical distance between each substation.

[0026] Reactive power flow: refers to the flow of reactive power in a power system. In a power system, reactive power is the part related to the storage and release of electrical energy. It is not directly converted into useful work, but it is essential to maintain voltage levels and support the stable operation of the power system. Reactive power is usually measured in kilovars (kVar) or megavars (MVar). Reactive power flow analysis is an important part of power system stability and economic operation because it involves issues such as voltage control, equipment capacity limitations, and network losses.

[0027] Example 1

[0028] According to an embodiment of the present application, an AVC area reactive power auxiliary control method is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0029] Figure 1 is a flow chart of an AVC area reactive power auxiliary control method provided according to an embodiment of the present application, such as Figure 1 As shown, the method comprises the following steps:

[0030] Step S102, obtaining first reactive power flow data on the medium voltage side of the target substation, and determining whether there is excess reactive power in the target automatic voltage control AVC area according to the first reactive power flow data, wherein the target AVC area includes multiple AVC substations, and the high voltage side busbars of the AVC substations are connected to the medium voltage side of the target substation through the target tie line;

[0031] Step S104, when there is excess reactive power in the target AVC area, obtain the power factor and the second reactive power flow data corresponding to the target tie line, the low-voltage side bus voltage and reactive power usage data of each AVC substation, and determine whether each AVC substation has excess reactive power and needs reactive power regulation based on the power factor, the second reactive power flow data, the low-voltage side bus voltage and the reactive power usage data;

[0032] Step S106: for each AVC substation, when there is excess reactive power in the AVC substation and reactive power regulation is required, the working state of the reactive power compensation device in the AVC substation is adjusted.

[0033] The following describes each step of the AVC area reactive power auxiliary control method in conjunction with a specific implementation process.

[0034] In order to solve the technical problem that the flexibility of local reactive power regulation in the AVC area is not high in the relevant reactive power control scheme, the present application proposes an AVC area reactive power auxiliary control method, and the specific steps of the method are as follows:

[0035] First, in order to determine whether there is excess reactive power in the target AVC area, it is necessary to obtain the first reactive power flow data on the medium-voltage side of the target substation. This target AVC area is composed of multiple AVC substations, and these substations connect their high-voltage side busbars to the medium-voltage side of the target substation through target interconnection lines. By analyzing the reactive power flow data of these connection points, the reactive power status of the entire AVC area can be evaluated.

[0036] Among them, as a common configuration, such as Figure 2As shown, the target substation can be a 220kV substation, and the medium voltage side voltage of the target substation is 110kV; the target interconnection line is a 110kV line, and the high voltage side voltage of one AVC substation is 110kV, and the low voltage side voltage is 10kV, that is, it is connected to a 10kV busbar. The following description is based on this configuration.

[0037] The following method can be used to obtain the first reactive power flow data on the medium voltage side of the target substation and determine whether there is excess reactive power in the target AVC area based on the data: use the dispatching automation collection equipment to obtain the first reactive power at the medium voltage side switch of the target substation, where if the first reactive power is a negative value, it means that the first reactive power is output from the target substation to the target AVC area; if the first reactive power is a positive value, it means that the first reactive power is input from the target AVC area to the target substation; then compare the first reactive power with the first preset threshold; if the first reactive power is greater than the first preset threshold, it is determined that there is excess reactive power in the target AVC area.

[0038] For example, in a 220kV substation, there is a main transformer as the target substation connected to the 220kV and 110kV busbars. When the reactive power on the medium voltage side of the 220kV main transformer (i.e. the side connected to the 110kV busbar) exceeds 0.1 Mvar and this value is positive, it means that the reactive power is flowing from the 110kV busbar to the 220kV main transformer, which means that at this moment, the reactive power on the 110kV busbar exceeds the local demand and the excess reactive power is fed back to the system where the 220kV main transformer is located.

[0039] After determining that there is excess reactive power in the target AVC area, obtain the power factor and second reactive power flow data corresponding to the target tie line, the low-voltage bus voltage and reactive power usage data of each AVC substation, and further determine whether there is excess reactive power and reactive power regulation is required for each AVC substation based on the power factor, second reactive power flow data, low-voltage bus voltage and reactive power usage data. This can be done in the following ways:

[0040] The second reactive power and power factor on the target interconnection line, the low-voltage bus voltage of each AVC substation and the consumed third reactive power are obtained by using the dispatching automation collection equipment. If the second reactive power is a negative value, it means that the second reactive power is output from the AVC substation to the target interconnection line. If the second reactive power is a positive value, it means that the second reactive power is input from the target interconnection line to the AVC substation.

[0041] For each AVC substation, it is determined whether the low-voltage side bus voltage of the AVC substation is within a preset qualified voltage range.

[0042] For example, in order to ensure the safe and economical operation of the power system, the 10kV bus voltage of the substation needs to be maintained in the qualified range of 10.2kV to 10.7kV. Nevertheless, even if the voltage is qualified, the area including 110kV may still have excess reactive power, which will be fed back to the 220kV transformer, increase the reactive power burden of the main grid, and cause voltage loss. The current AVC system mainly focuses on voltage qualification and is not sensitive enough to excess reactive power. Therefore, it is necessary to further check the control parameters under the premise of qualified voltage control so as to timely optimize reactive power and ensure that the problem of excess reactive power is effectively managed. In this way, the voltage control strategy and the reactive power optimization auxiliary control strategy can work together to avoid voltage adjustment affecting reactive power optimization.

[0043] When the low-voltage side bus voltage is within the qualified voltage range, the absolute value of the power factor is compared with the second preset threshold value corresponding to the power factor; when the absolute value of the power factor is less than the second preset threshold value, the second reactive power is compared with the third preset threshold value corresponding to the second reactive power; when the second reactive power is less than the third preset threshold value, the sum of the second reactive power and the third reactive power corresponding to the AVC substation is determined, and the ratio of the absolute value of the second reactive power to the third reactive power is determined, and the sum is compared with the fourth preset threshold value, and the ratio is compared with the fifth preset threshold value; when the sum is less than the fourth preset threshold value and the ratio is greater than the fifth preset threshold value, it is determined that the AVC substation has excess reactive power and requires reactive power regulation.

[0044] In order to better understand and process these data, the following is a detailed analysis of the calculation and judgment logic of the power factor of the 110kV line as the target tie line, as well as how to process the relationship between the power factor and the direction of E8000 dispatching automation data collection:

[0045] First, the power factor is calculated as follows:

[0046]

[0047] Where P represents active power (unit: kW) and Q represents reactive power (unit: kVar).

[0048] Next, the power factor calculation formula is:

[0049]

[0050] In the formula, Indicates the power factor.

[0051] According to the definition of the E8000 dispatching automation system, the directionality of reactive power is very important. When the reactive power is a negative value, it means that the reactive power is output from the AVC substation to the target interconnection line. When the reactive power is a positive value, it means that the reactive power is input from the target interconnection line to the AVC substation.

[0052] Assuming that the second preset threshold is 0.98, it means that no matter what the direction of the reactive power is, as long as the absolute value of the power factor is less than 0.98, the power factor of the line is considered to be unqualified.

[0053] When the absolute value of the power factor is less than the second preset threshold, the second reactive power is compared with the third preset threshold.

[0054] When the second reactive power is less than the third preset threshold, the sum of the second reactive power and the third reactive power corresponding to the AVC substation is determined, and the ratio of the absolute value of the second reactive power to the third reactive power is determined.

[0055] Still taking the above as an example, assuming that the fourth preset threshold is 1Mvar and the fifth preset threshold is 80%, when the sum of the reactive power of the 110kV line and the reactive power of the 10kV bus (regardless of whether the capacitor is put into use or not) is less than 1Mvar, and the reactive power of the 110kV line is required to account for at least 80% of the reactive power of the 10kV bus, it can be determined as reactive power surplus.

[0056] For each AVC substation, when there is excess reactive power in the AVC substation and reactive power regulation is required, the working state of the reactive power compensation device in the AVC substation is adjusted.

[0057] As an optional implementation, the reactive power compensation equipment in the AVC substation includes a capacitor group and a reactor group, and the method also includes: using the scheduling automation collection equipment to obtain the fourth reactive power at the low-voltage side switch of the AVC substation, wherein if the fourth reactive power is a negative value, it indicates that the fourth reactive power is output from the AVC substation, and if the second reactive power is a positive value, it indicates that the second reactive power is input into the AVC substation; when the capacitor group is put into operation and the reactor group is not put into operation, the third reactive power is determined to be the sum of the second reactive power, the fifth reactive power generated by the capacitor group, and the fourth reactive power; when the capacitor group is not put into operation and the reactor group is put into operation, the third reactive power is determined to be the sum of the second reactive power, the sixth reactive power consumed by the reactor group, and the fourth reactive power.

[0058] Optionally, the reactive power compensation equipment in the AVC substation includes a capacitor group and a reactor group, and adjusting the working state of the reactive power compensation equipment in the AVC substation includes: when the capacitor group is put into operation and the reactor group is not put into operation, reducing the number of capacitors put into operation in the capacitor group; when the capacitor group is not put into operation and the reactor group is put into operation, increasing the number of reactors put into operation in the reactor group.

[0059] When there is no excess reactive power in the target AVC area, or the low-voltage side bus voltage is not within the qualified voltage range, or the absolute value of the power factor is not less than the second preset threshold, or the second reactive power is not less than the third preset threshold, or the sum is not less than the fourth preset threshold, or the ratio is not greater than the fifth preset threshold, the reactive power of the target AVC area is controlled according to the preset AVC area reactive power control strategy.

[0060] It should be noted that this control strategy is an auxiliary solution to the existing control strategy. This control strategy does not trigger adjustment actions and does not affect the actions of the existing control strategy. For example, when the bus voltage on the low-voltage side is abnormal, it will directly trigger the existing control strategy to adjust the reactive power compensation equipment.

[0061] In an embodiment of the present application, first reactive power flow data on the medium voltage side of a target substation is obtained, and based on the first reactive power flow data, it is determined whether there is excess reactive power in a target voltage automatic control AVC area, wherein the target AVC area includes a plurality of AVC substations, and the high voltage side bus of the AVC substation is connected to the medium voltage side of the target substation through a target interconnection line; in the case where there is excess reactive power in the target AVC area, the power factor and second reactive power flow data corresponding to the target interconnection line, the low voltage side bus voltage and reactive power usage data of each AVC substation are obtained, and based on the power factor, the second reactive power flow data, the low voltage side bus voltage and reactive power usage data, it is determined whether there is excess reactive power and reactive power regulation is required for each AVC substation; for each AVC substation, in the case where there is excess reactive power and reactive power regulation is required in the AVC substation, the working state of the reactive power compensation device in the AVC substation is adjusted. In this way, real-time monitoring and adjustment of the reactive power of each AVC substation can avoid voltage fluctuations caused by excess or insufficient reactive power, thereby improving the stability of the entire power system and solving the technical problem of low flexibility in local reactive power regulation in the AVC area in related reactive power control schemes.

[0062] Example 2

[0063] According to an embodiment of the present application, an AVC area reactive power auxiliary control device for implementing the AVC area reactive power auxiliary control method in embodiment 1 is also provided. Figure 3As shown, the AVC area reactive power auxiliary control device at least includes: a first judgment module 31, a second judgment module 32 and a reactive power adjustment module 33, wherein:

[0064] The first judgment module 31 is used to obtain the first reactive power flow data of the medium voltage side of the target substation, and determine whether there is excess reactive power in the target AVC area according to the first reactive power flow data, wherein the target AVC area includes multiple AVC substations, and the high voltage side busbars of the AVC substations are connected to the medium voltage side of the target substation through the target tie line;

[0065] The second judgment module 32 is used to obtain the power factor and the second reactive power flow data corresponding to the target tie line, the low-voltage side bus voltage and reactive power usage data of each AVC substation when there is excess reactive power in the target AVC area, and determine whether each AVC substation has excess reactive power and needs reactive power regulation based on the power factor, the second reactive power flow data, the low-voltage side bus voltage and the reactive power usage data;

[0066] The reactive power regulation module 33 is used to adjust the working state of the reactive power compensation device in each AVC substation when there is excess reactive power in the AVC substation and reactive power regulation is required.

[0067] The functions of each module of the AVC area reactive power auxiliary control device are explained below in conjunction with a specific implementation process.

[0068] First, in order to determine whether there is excess reactive power in the target AVC area, it is necessary to obtain the first reactive power flow data on the medium-voltage side of the target substation. This target AVC area is composed of multiple AVC substations, and these substations connect their high-voltage side busbars to the medium-voltage side of the target substation through target interconnection lines. By analyzing the reactive power flow data of these connection points, the reactive power status of the entire AVC area can be evaluated.

[0069] Among them, as a common configuration, the target substation can be a 220kV substation, and the medium voltage side voltage of the target substation is 110kV; the high voltage side voltage of the AVC substation is 110kV, and the low voltage side voltage is 10kV. The following is explained with this configuration.

[0070] The first judgment module obtains the first reactive power flow data on the medium voltage side of the target substation and determines whether there is excess reactive power in the target AVC area based on the data. The following method can be used: the first reactive power at the medium voltage side switch of the target substation is obtained by using the dispatching automation acquisition equipment, wherein if the first reactive power is a negative value, it indicates that the first reactive power is output from the target substation to the target AVC area; if the first reactive power is a positive value, it indicates that the first reactive power is input from the target AVC area to the target substation; then the first reactive power is compared with the first preset threshold; if the first reactive power is greater than the first preset threshold, it is determined that there is excess reactive power in the target AVC area.

[0071] For example, in a 220kV substation, there is a main transformer as the target substation connected to the 220kV and 110kV busbars. When the reactive power on the medium voltage side of the 220kV main transformer (i.e. the side connected to the 110kV busbar) exceeds 0.1 Mvar and this value is positive, it means that the reactive power is flowing from the 110kV busbar to the 220kV main transformer, which means that at this moment, the reactive power on the 110kV busbar exceeds the local demand and the excess reactive power is fed back to the system where the 220kV main transformer is located.

[0072] After determining that there is excess reactive power in the target AVC area, the second judgment module obtains the power factor and the second reactive power flow data corresponding to the target tie line, the low-voltage side bus voltage and reactive power usage data of each AVC substation, and further determines whether there is excess reactive power and reactive power regulation is required for each AVC substation based on the power factor, the second reactive power flow data, the low-voltage side bus voltage and reactive power usage data, which can be done in the following ways:

[0073] The second reactive power and power factor on the target interconnection line, the low-voltage bus voltage of each AVC substation and the consumed third reactive power are obtained by using the dispatching automation collection equipment. If the second reactive power is a negative value, it means that the second reactive power is output from the AVC substation to the target interconnection line. If the second reactive power is a positive value, it means that the second reactive power is input from the target interconnection line to the AVC substation.

[0074] For each AVC substation, it is determined whether the low-voltage side bus voltage of the AVC substation is within a preset qualified voltage range.

[0075] For example, in order to ensure the safe and economical operation of the power system, the 10kV bus voltage of the substation needs to be maintained in the qualified range of 10.2kV to 10.7kV. Nevertheless, even if the voltage is qualified, the 110kV area may still have excess reactive power, which will be fed back to the 220kV transformer, increasing the reactive power burden of the main grid and causing voltage loss. The current AVC system mainly focuses on voltage compliance and is not sensitive enough to reactive power excess. Therefore, it is necessary to further check the control parameters on the premise of qualified voltage control so as to timely optimize reactive power and ensure that the reactive power excess problem is effectively managed. In this way, the voltage control strategy and the reactive power optimization auxiliary control strategy can work together to avoid voltage adjustment affecting reactive power optimization.

[0076] When the low-voltage side bus voltage is within the qualified voltage range, the absolute value of the power factor is compared with the second preset threshold value corresponding to the power factor; when the absolute value of the power factor is less than the second preset threshold value, the second reactive power is compared with the third preset threshold value corresponding to the second reactive power; when the second reactive power is less than the third preset threshold value, the sum of the second reactive power and the third reactive power corresponding to the AVC substation is determined, and the ratio of the absolute value of the second reactive power to the third reactive power is determined, and the sum is compared with the fourth preset threshold value, and the ratio is compared with the fifth preset threshold value; when the sum is less than the fourth preset threshold value and the ratio is greater than the fifth preset threshold value, it is determined that the AVC substation has excess reactive power and requires reactive power regulation.

[0077] The reactive power regulation module adjusts the working state of the reactive power compensation device in the AVC substation when there is excess reactive power in the AVC substation and reactive power regulation is required.

[0078] The reactive power compensation equipment in the AVC substation includes a capacitor group and a reactor group, and the method also includes: using the dispatching automation collection equipment to obtain the fourth reactive power at the low-voltage side switch of the AVC substation, wherein if the fourth reactive power is a negative value, it indicates that the fourth reactive power is output from the AVC substation, and if the second reactive power is a positive value, it indicates that the second reactive power is input into the AVC substation; when the capacitor group is put into operation and the reactor group is not put into operation, the third reactive power is determined to be the sum of the second reactive power, the fifth reactive power generated by the capacitor group, and the fourth reactive power; when the capacitor group is not put into operation and the reactor group is put into operation, the third reactive power is determined to be the sum of the second reactive power, the sixth reactive power consumed by the reactor group, and the fourth reactive power.

[0079] The reactive power compensation equipment in the AVC substation includes a capacitor group and a reactor group. Adjusting the working state of the reactive power compensation equipment in the AVC substation includes: when the capacitor group is put into operation and the reactor group is not put into operation, reducing the number of capacitors put into operation in the capacitor group; when the capacitor group is not put into operation and the reactor group is put into operation, increasing the number of reactors put into operation in the reactor group.

[0080] When there is no excess reactive power in the target AVC area, or the low-voltage side bus voltage is not within the qualified voltage range, or the absolute value of the power factor is not less than the second preset threshold, or the second reactive power is not less than the third preset threshold, or the sum is not less than the fourth preset threshold, or the ratio is not greater than the fifth preset threshold, the reactive power of the target AVC area is controlled according to the preset AVC area reactive power control strategy.

[0081] It should be noted that this control strategy is an auxiliary solution to the existing control strategy. This control strategy does not trigger adjustment actions and does not affect the actions of the existing control strategy. For example, when the bus voltage on the low-voltage side is abnormal, it will directly trigger the existing control strategy to adjust the reactive power compensation equipment.

[0082] It should be noted that each module in the AVC area reactive power auxiliary control device in the embodiment of the present application corresponds one by one to each implementation step of the AVC area reactive power auxiliary control method in Example 1. Since a detailed description has been given in Example 1, some details not reflected in this embodiment can be referred to Example 1, and will not be repeated here.

[0083] Example 3

[0084] According to an embodiment of the present application, a computer program product is also provided, which includes a computer program, wherein when the computer program is executed by a processor, the AVC area reactive power auxiliary control method in embodiment 1 is implemented.

[0085] According to an embodiment of the present application, a non-volatile storage medium is also provided, which includes a stored computer program, wherein the device where the non-volatile storage medium is located executes the AVC area reactive power auxiliary control method in Example 1 by running the computer program.

[0086] According to an embodiment of the present application, a processor is also provided, which is used to run a computer program, wherein the AVC area reactive power auxiliary control method in Example 1 is executed when the computer program is running.

[0087] According to an embodiment of the present application, an electronic device is also provided, which includes: a memory and a processor, wherein a computer program is stored in the memory, and the processor is configured to execute the AVC area reactive power auxiliary control method in Example 1 through the computer program.

[0088] Specifically, when the computer program is running, the following steps are executed: obtaining the first reactive power flow data of the medium voltage side of the target substation, and determining whether there is excess reactive power in the target voltage automatic control AVC area based on the first reactive power flow data, wherein the target AVC area includes multiple AVC substations, and the high voltage side bus of the AVC substation is connected to the medium voltage side of the target substation through a target interconnection line; in the case where there is excess reactive power in the target AVC area, obtaining the power factor and the second reactive power flow data corresponding to the target interconnection line, the low voltage side bus voltage and reactive power usage data of each AVC substation, and determining whether there is excess reactive power and reactive power regulation is required for each AVC substation based on the power factor, the second reactive power flow data, the low voltage side bus voltage and the reactive power usage data; for each AVC substation, when there is excess reactive power and reactive power regulation is required in the AVC substation, adjusting the working state of the reactive power compensation device in the AVC substation.

[0089] As an optional implementation, the electronic device may be in the form of a mobile terminal, a computer terminal or a similar computing device. Figure 4 FIG. 1 shows a hardware structure block diagram of an electronic device for implementing an AVC area reactive power auxiliary control method. Figure 4 As shown, the electronic device 40 may include one or more (402a, 402b, ..., 402n are used to illustrate) processors 402 (the processor 402 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA), a memory 404 for storing data, and a transmission device 406 for communication functions. In addition, it may also include: a display, an input / output interface (I / O interface), a universal serial bus (USB) port (which may be included as one of the ports of the BUS bus), a network interface, a power supply and / or a camera. It can be understood by those skilled in the art that Figure 4 The structure shown is only for illustration and does not limit the structure of the above electronic device. Figure 4 More or fewer components as shown, or with Figure 4 Different configurations are shown.

[0090] It should be noted that the one or more processors 402 and / or other data processing circuits described above may generally be referred to herein as "data processing circuits". The data processing circuits may be embodied in whole or in part as software, hardware, firmware, or any other combination thereof. In addition, the data processing circuit may be a single independent processing module, or may be incorporated in whole or in part into any of the other components in the electronic device 40. As described in the embodiments of the present application, the data processing circuit acts as a processor control (e.g., selection of a variable resistor terminal path connected to an interface).

[0091] The memory 404 can be used to store software programs and modules of application software, such as the program instructions / data storage device corresponding to the AVC area reactive power auxiliary control method in the embodiment of the present application. The processor 402 executes various functional applications and data processing by running the software programs and modules stored in the memory 404, that is, realizing the vulnerability detection method of the above-mentioned application. The memory 404 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 404 may further include a memory remotely arranged relative to the processor 402, and these remote memories may be connected to the electronic device 40 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0092] The transmission device 406 is used to receive or send data via a network. The specific example of the above network may include a wireless network provided by a communication provider of the electronic device 40. In one example, the transmission device 406 includes a network adapter (Network Interface Controller, NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 406 can be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0093] The display may be, for example, a touch screen liquid crystal display (LCD) that may enable a user to interact with a user interface of the electronic device 40 .

[0094] The serial numbers of the above embodiments are only for description and do not represent the advantages or disadvantages of the embodiments.

[0095] In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0096] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0097] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed over multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0098] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0099] If the integrated unit is implemented in the form of 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 the present application, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, server or network device, etc.) to execute all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, disk or optical disk and other media that can store program codes.

[0100] The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A reactive power auxiliary control method in an AVC area, characterized in that: include: Acquire first reactive power flow data on the medium voltage side of the target substation, and determine whether there is excess reactive power in the target automatic voltage control AVC area according to the first reactive power flow data, wherein the target AVC area includes multiple AVC substations, and the high voltage side busbars of the AVC substations are connected to the medium voltage side of the target substation through the target tie line; In the case where there is excess reactive power in the target AVC area, the power factor and the second reactive power flow data corresponding to the target tie line, the low-voltage side bus voltage and reactive power usage data of each AVC substation are obtained, and whether each AVC substation has excess reactive power and needs reactive power regulation is determined based on the power factor, the second reactive power flow data, the low-voltage side bus voltage and the reactive power usage data; For each of the AVC substations, when there is excess reactive power in the AVC substation and reactive power regulation is required, adjusting the working state of the reactive power compensation device in the AVC substation; Among them, the power factor and the second reactive power flow data corresponding to the target tie line, the low-voltage side bus voltage and reactive power usage data of each AVC substation are obtained, and based on the power factor, the second reactive power flow data, the low-voltage side bus voltage and the reactive power usage data, it is determined whether each AVC substation has excess reactive power and needs reactive power regulation, including: using the dispatching automation acquisition equipment to obtain the second reactive power and the power factor on the target tie line, the low-voltage side bus voltage and the consumed third reactive power of each AVC substation, wherein if the second reactive power is a negative value, it means that the second reactive power is output from the AVC substation to the target tie line, and if the second reactive power is a positive value, it means that the second reactive power is input from the target tie line to the AVC substation; for each AVC substation, determine the whether the low-voltage side bus voltage is within a preset qualified voltage range; when the low-voltage side bus voltage is within the qualified voltage range, compare the absolute value of the power factor with a second preset threshold; when the absolute value of the power factor is less than the second preset threshold, compare the second reactive power with a third preset threshold; when the second reactive power is less than the third preset threshold, determine the sum of the second reactive power and the third reactive power corresponding to the AVC substation, and determine the ratio of the absolute value of the second reactive power to the third reactive power, compare the sum with a fourth preset threshold, and compare the ratio with a fifth preset threshold; when the sum is less than the fourth preset threshold and the ratio is greater than the fifth preset threshold, determine that the AVC substation has excess reactive power and requires reactive power regulation.

2. The method according to claim 1, characterized in that Acquiring first reactive power flow data on the medium voltage side of the target substation, and determining whether there is excess reactive power in the target AVC area according to the first reactive power flow data, including: The first reactive power at the medium voltage side switch of the target substation is obtained by using a dispatching automation collection device, wherein if the first reactive power is a negative value, it indicates that the first reactive power is output from the target substation to the target AVC area; if the first reactive power is a positive value, it indicates that the first reactive power is input from the target AVC area to the target substation; comparing the first reactive power with a first preset threshold; When the first reactive power is greater than the first preset threshold, it is determined that excess reactive power exists in the target AVC area.

3. The method according to claim 1, characterized in that The reactive power compensation device in the AVC substation includes a capacitor group and a reactor group, and the method further includes: The fourth reactive power at the low-voltage side switch of the AVC substation is obtained by using the dispatching automation acquisition device, wherein if the fourth reactive power is a negative value, it indicates that the fourth reactive power is output from the AVC substation, and if the second reactive power is a positive value, it indicates that the second reactive power is input into the AVC substation; When the capacitor bank is in operation and the reactor bank is not in operation, determining the third reactive power as the sum of the second reactive power, the fifth reactive power generated by the capacitor bank, and the fourth reactive power; When the capacitor group is not put into operation and the reactor group is put into operation, the third reactive power is determined to be the sum of the second reactive power, the sixth reactive power consumed by the reactor group, and the fourth reactive power.

4. The method according to claim 1, characterized in that: The reactive power compensation device in the AVC substation includes a capacitor group and a reactor group, and adjusting the working state of the reactive power compensation device in the AVC substation includes: When the capacitor bank is put into operation but the reactor bank is not put into operation, reducing the number of capacitors put into operation in the capacitor bank; When the capacitor group is not put into operation but the reactor group is put into operation, the number of reactors put into operation in the reactor group is increased.

5. The method according to claim 1, characterized in that The method further comprises: When there is no excess reactive power in the target AVC area, or the low-voltage side bus voltage is not within the qualified voltage range, or the absolute value of the power factor is not less than the second preset threshold, or the second reactive power is not less than the third preset threshold, or the sum is not less than the fourth preset threshold, or the ratio is not greater than the fifth preset threshold, the reactive power of the target AVC area is controlled according to the preset AVC area reactive power control strategy.

6. The method according to any one of claims 1 to 5, characterized in that The target substation is a 220kV substation, and the medium voltage side voltage of the target substation is 110kV; The high-voltage side voltage of the AVC substation is 110 kV, and the low-voltage side voltage is 10 kV.

7. An AVC area reactive power auxiliary control device, characterized in that: include: A first judgment module is used to obtain first reactive power flow data on the medium voltage side of the target substation, and determine whether there is excess reactive power in the target AVC area according to the first reactive power flow data, wherein the target AVC area includes multiple AVC substations, and the high-voltage side busbars of the AVC substations are connected to the medium voltage side of the target substation through a target tie line; The second judgment module is used to obtain the power factor and second reactive power flow data corresponding to the target tie line, the low-voltage side bus voltage and reactive usage data of each AVC substation when there is excess reactive power in the target AVC area, and determine whether each AVC substation has excess reactive power and needs reactive power regulation based on the power factor, the second reactive power flow data, the low-voltage side bus voltage and the reactive usage data, including: using the dispatching automation acquisition equipment to obtain the second reactive power and the power factor on the target tie line, the low-voltage side bus voltage and the consumed third reactive power of each AVC substation, wherein if the second reactive power is a negative value, it means that the second reactive power is output from the AVC substation to the target tie line, and if the second reactive power is a positive value, it means that the second reactive power is input from the target tie line to the AVC substation; for each AVC substation station, determining whether the low-voltage side bus voltage of the AVC substation is within a preset qualified voltage range; when the low-voltage side bus voltage is within the qualified voltage range, comparing the absolute value of the power factor with a second preset threshold value; when the absolute value of the power factor is less than the second preset threshold value, comparing the second reactive power with a third preset threshold value; when the second reactive power is less than the third preset threshold value, determining the sum of the second reactive power and the third reactive power corresponding to the AVC substation, and determining the ratio of the absolute value of the second reactive power to the third reactive power, respectively comparing the sum with a fourth preset threshold value, and comparing the ratio with a fifth preset threshold value; when the sum is less than the fourth preset threshold value and the ratio is greater than the fifth preset threshold value, determining that the AVC substation has excess reactive power and requires reactive power regulation; The reactive power regulation module is used to adjust the working state of the reactive power compensation device in each of the AVC substations when there is excess reactive power in the AVC substation and reactive power regulation is required.

8. A computer program product, characterized in that include: A computer program, wherein when the computer program is executed by a processor, the AVC area reactive power auxiliary control method according to any one of claims 1 to 6 is implemented.

9. An electronic device, characterized in that: include: A memory and a processor, wherein a computer program is stored in the memory, and the processor is configured to execute the AVC area reactive power auxiliary control method according to any one of claims 1 to 6 through the computer program.

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