Reactive compensation method and device

Abstract

The invention provides a reactive compensation method and device. The method comprises the following steps: acquiring a voltage amplitude and a set value of a monitoring bus in a target new energy base; inputting the voltage amplitude and the set value of the monitoring bus into a target function of a preset switching scheme optimization model, and adjusting the number of input groups of a plurality of capacitors and the number of input groups of a plurality of reactors of the target new energy base in the target function until the target function meets a preset constraint condition, a minimum value of the objective function; and completing reactive compensation of the target new energy base by applying the input grouping number of each capacitor and the input grouping number of each reactor when the minimum value of the target function is obtained. According to the invention, the precision of grouping switching of the capacitor and the reactor can be improved, and the reliability of reactive compensation can be improved.

Description

Technical Field

[0001] This application relates to the field of new energy technologies, and in particular, to a reactive power compensation method and device. Background Art

[0002] Reactive power compensation in new energy power stations is to install reactive power compensation equipment in new energy power stations to meet the requirements of grid voltage levels and economic operation. Reactive power compensation in new energy power stations can provide basic support for reactive power compensation in new energy bases. Reactive power compensation equipment in power systems includes capacitors, reactors, synchronous condensers, static var compensators (SVC), and static synchronous compensators (STATCOM). Adopting certain reactive power compensation means in new energy power stations can increase the maximum installed capacity of new energy power stations, reduce the power loss of the transmission network, and increase the voltage stability margin of the power grid. Usually, capacitors and reactors are switched in groups, and the regulation characteristics are discontinuous. However, due to their low price, they are generally used to undertake basic reactive power support, while static var compensators and static synchronous compensators with excellent regulation characteristics are used as dynamic reactive power regulation reserves.

[0003] Currently, new energy bases are faced with the situation that the output levels of new energy units change frequently, which makes it difficult to effectively adjust the switching schemes of capacitors / reactors in each new energy power station and collection station in the new energy base manually, affecting the effect of reactive power compensation. Summary of the Invention

[0004] In view of at least one problem in the prior art, this application proposes a reactive power compensation method and device, which can improve the accuracy of grouped switching of capacitors and reactors, and thus can improve the reliability of reactive power compensation.

[0005] To solve the above technical problems, this application provides the following technical solutions:

[0006] In a first aspect, this application provides a reactive power compensation method, including:

[0007] Obtain the voltage amplitude and set value of the monitoring bus in the target new energy base;

[0008] Input the voltage amplitude and set value of the monitoring bus into the objective function of a preset switching scheme optimization model, and adjust the number of input groups of multiple capacitors and the number of input groups of multiple reactors in the target new energy base in the objective function until the minimum value of the objective function is obtained under the condition that the objective function meets the preset constraint conditions;

[0009] When the minimum value of the obtained objective function is applied, the number of switching groups of each capacitor and the number of switching groups of each reactor are used to complete the reactive power compensation of the target new energy base.

[0010] In one embodiment, the objective function of the preset switching scheme optimization model is:

[0011]

[0012] x = (x1, x2, ……, x i , ……, x n )

[0013] where x is a vector composed of the number of switching groups of each capacitor and reactor, x i is the number of switching groups of the i-th reactive power compensation device, and any reactive power compensation device is a capacitor or a reactor, n is the total number of capacitors and reactors, V k (x) is the voltage amplitude of the k-th monitoring bus, is the voltage setting value of the k-th monitoring bus, w k is the weight coefficient of the k-th monitoring bus, and N m is the total number of monitoring buses.

[0014] In one embodiment, the preset constraint conditions include:

[0015] Power flow balance constraint, generator active and reactive power output constraint, node voltage constraint, line and transformer thermal stability constraint, and switching group number constraint.

[0016] In one embodiment, when the minimum value of the obtained objective function is applied, the number of switching groups of each capacitor and the number of switching groups of each reactor are used to complete the reactive power compensation of the target new energy base, including:

[0017] When the minimum value of the obtained objective function is applied, the number of switching groups of each capacitor is used to perform the switching of each capacitor;

[0018] When the minimum value of the obtained objective function is applied, the number of switching groups of each reactor is used to perform the switching of each reactor, and the reactive power compensation of the target new energy base is completed.

[0019] In one embodiment, the power flow balance constraint is:

[0020]

[0021] where P g,y (x) is the active power generation of the y-th bus, P d,yThe active power of the load on the y-th bus, V y (x) is the voltage magnitude of the y-th bus, V j (x) is the voltage magnitude of the j-th bus, θ yj is the phase angle difference between the y-th bus and the j-th bus, G yj (x) is the real part of the element of the nodal admittance matrix between the y-th bus and the j-th bus, B yj (x) is the imaginary part of the element of the nodal admittance matrix between the y-th bus and the j-th bus, N is the total number of buses, Q g,y (x) is the reactive power generation of the y-th bus, Q d,y is the reactive power of the load on the y-th bus.

[0022] In one embodiment, the active and reactive power output constraints of the generator are:

[0023]

[0024] Among them, P g,y (x) is the active power generation of the y-th bus, Q g,y (x) represents the reactive power generation of the y-th bus, is the lower limit of the active power generation of the y-th bus, is the upper limit of the active power generation of the y-th bus, is the lower limit of the reactive power generation of the y-th bus, is the upper limit of the reactive power generation of the y-th bus.

[0025] In one embodiment, the node voltage constraint is:

[0026]

[0027] Among them, Vx(x) is the voltage magnitude of the y-th bus, is the lower limit of the voltage magnitude of the y-th bus, is the upper limit of the voltage magnitude of the y-th bus.

[0028] In a second aspect, the present application provides a reactive power compensation device, including:

[0029] An acquisition module, configured to acquire the voltage magnitude and the set value of the monitoring bus in the target new energy base;

[0030] An adjustment module, configured to input the voltage magnitude and the set value of the monitoring bus into the objective function of a preset switching scheme optimization model, and adjust the number of switched-in groups of multiple capacitors and the number of switched-in groups of multiple reactors in the target new energy base in the objective function until the minimum value of the objective function is obtained when the objective function satisfies the preset constraint conditions;

[0031] The reactive power compensation module is used to complete the reactive power compensation of the target new energy base by using the number of switched-in groups of each capacitor and the number of switched-in groups of each reactor when the minimum value of the target function is obtained.

[0032] In one embodiment, the objective function of the preset switching scheme optimization model is:

[0033]

[0034] x = (x1, x2, ……, x i , ……, x n )

[0035] where x is a vector composed of the number of switched-in groups of each capacitor and reactor, x i is the number of switched-in groups of the i-th reactive power compensation device, and any reactive power compensation device is a capacitor or a reactor, n is the total number of capacitors and reactors, V k (x) is the voltage amplitude of the k-th monitoring bus, is the voltage set value of the k-th monitoring bus, w k is the weight coefficient of the k-th monitoring bus, and N m is the total number of monitoring buses.

[0036] In one embodiment, the preset constraint conditions include:

[0037] Power flow balance constraint, generator active and reactive power output constraint, node voltage constraint, line and transformer thermal stability constraint, and switching group number constraint.

[0038] In one embodiment, the reactive power compensation module includes:

[0039] The first switching unit is used to perform the switching of each capacitor by using the number of switched-in groups of each capacitor when the minimum value of the target function is obtained;

[0040] The second switching unit is used to perform the switching of each reactor by using the number of switched-in groups of each reactor when the minimum value of the target function is obtained, and complete the reactive power compensation of the target new energy base.

[0041] In one embodiment, the power flow balance constraint is:

[0042]

[0043] where P g,y (x) is the active power generation of the y-th bus, P d,y is the active power load of the y-th bus, and V y(x) is the voltage amplitude of the y-th bus, V j (x) is the voltage amplitude of the j-th bus, θ yj is the phase angle difference between the y-th bus and the j-th bus, G yj (x) is the real part of the element of the nodal admittance matrix between the y-th bus and the j-th bus, B yj (x) is the imaginary part of the element of the nodal admittance matrix between the y-th bus and the j-th bus, N is the total number of buses, Q g,y (x) is the reactive power generation of the y-th bus, Q d,y is the reactive power load of the y-th bus.

[0044] In one embodiment, the active and reactive power output constraints of the generator are:

[0045]

[0046] Among them, P g,y (x) is the active power generation of the y-th bus, Q g,y (x) represents the reactive power generation of the y-th bus, is the lower limit of the active power generation of the y-th bus, is the upper limit of the active power generation of the y-th bus, is the lower limit of the reactive power generation of the y-th bus, is the upper limit of the reactive power generation of the y-th bus.

[0047] In one embodiment, the nodal voltage constraints are:

[0048]

[0049] Among them, V y (x) is the voltage amplitude of the y-th bus, is the lower limit of the voltage amplitude of the y-th bus, is the upper limit of the voltage amplitude of the y-th bus.

[0050] In a third aspect, the present application provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, the reactive power compensation method described above is implemented.

[0051] In a fourth aspect, the present application provides a computer-readable storage medium, on which computer instructions are stored. When the instructions are executed by a processor, the reactive power compensation method described above is implemented.

[0052] As can be seen from the above technical solution, the present application provides a reactive power compensation method and device. Among them, the method includes obtaining the voltage amplitude and set value of the monitoring bus in the target new energy base; inputting the voltage amplitude and set value of the monitoring bus into the objective function of a preset switching scheme optimization model, and adjusting the number of input groups of multiple capacitors and the number of input groups of multiple reactors of the target new energy base in the objective function until the minimum value of the objective function is obtained when the objective function meets the preset constraint conditions; applying the number of input groups of each capacitor and the number of input groups of each reactor when the minimum value of the objective function is obtained to complete the reactive power compensation of the target new energy base, which can improve the accuracy of the grouped switching of capacitors and reactors, and further improve the reliability of reactive power compensation; specifically, when the new energy output scheme changes, by optimizing and adjusting the number of input groups of capacitors and reactors in the new energy collection station and the new energy power station, the overall optimal level of the voltage of the selected monitoring node (i.e., the monitoring bus) can be maintained. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0054] Figure 1 It is the first flowchart of the reactive power compensation method in the embodiment of the present application;

[0055] Figure 2 It is the second flowchart of the reactive power compensation method in the embodiment of the present application;

[0056] Figure 3 It is the schematic diagram of the number of operating groups obtained after adopting the reactive power compensation method of this scheme when the simultaneous output rate of the new energy base is 0.4 in an example of the present application;

[0057] Figure 4 It is the schematic diagram of the comparison of the voltage amplitudes of the voltage monitoring nodes obtained before and after adopting the reactive power compensation method of this scheme when the simultaneous output rate of the new energy base is 0.4 in an example of the present application;

[0058] Figure 5 It is the schematic diagram of the number of operating groups obtained after adopting the reactive power compensation method of this scheme when the simultaneous output rate of the new energy base is 0.9 in an example of the present application;

[0059] Figure 6It is a schematic diagram comparing the voltage amplitudes of voltage monitoring nodes before and after adopting the reactive power compensation method of this solution when the simultaneity rate of power output of a new energy base in an example of this application is 0.9;

[0060] Figure 7 It is a schematic structural diagram of a reactive power compensation device in an embodiment of this application;

[0061] Figure 8 It is a schematic structural diagram of a reactive power compensation module in an embodiment of this application;

[0062] Figure 9 It is a schematic block diagram of the system composition of an electronic device in an embodiment of this application. Detailed implementation manners

[0063] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0064] Specifically, it will be described through the following various embodiments.

[0065] In order to improve the accuracy of capacitor and reactor group switching and further improve the reliability of reactive power compensation, this embodiment provides a reactive power compensation method whose execution entity is a reactive power compensation device. The reactive power compensation device includes but is not limited to a server, such as Figure 1 As shown, the method specifically includes the following contents:

[0066] Step 100: Obtain the voltage amplitude and set value of the monitoring bus in the target new energy base.

[0067] Specifically, that is, the monitoring bus can be a subset of all buses in the research area (target new energy base), and can be understood as a pilot bus. If the switching of capacitors and reactors can effectively control the voltage of the monitoring bus, then the voltage of the entire new energy base can be effectively controlled.

[0068] Step 200: Input the voltage amplitude and set value of the monitoring bus into the objective function of a preset switching scheme optimization model, and adjust the number of input groups of multiple capacitors and the number of input groups of multiple reactors in the target new energy base in the objective function until the minimum value of the objective function is obtained under the condition that the objective function meets the preset constraint conditions.

[0069] Step 300: Apply the number of switched-in groups of each capacitor and the number of switched-in groups of each reactor when the minimum value of the target function is obtained to complete the reactive power compensation of the target new energy base.

[0070] The objective function of the preset switching scheme optimization model can be:

[0071]

[0072] x = (x1, x2, ……, x i , ……, x n )

[0073] where x is a vector composed of the number of switched-in groups of each capacitor and reactor, x i is the number of switched-in groups of the i-th reactive power compensation device, any reactive power compensation device is a capacitor or a reactor, n is the total number of capacitors and reactors, V k (x) is the voltage amplitude of the k-th monitoring bus, is the voltage set value of the k-th monitoring bus, w k is the weight coefficient of the k-th monitoring bus, N m is the total number of monitoring buses. For example, x1 to x r are all the number of switched-in groups of capacitors, and x r+1 to x n are all the number of switched-in groups of reactors. Usually, when new energy generation is large (for example, the output power of photovoltaic is large at noon when sunlight is strong), reactive power needs to be supplemented, and capacitors are switched in at this time to provide reactive power; when the output of new energy is small (for example, the output power of photovoltaic is 0 at midnight when there is no light), at this time, there is excess reactive power in the network, and reactors need to be switched in to absorb the excess reactive power. The minimum value of the objective function can be minf(x).

[0074] The preset constraints may include: power flow balance constraint, generator active and reactive power output constraint, node voltage constraint, line and transformer thermal stability constraint, and switching group number constraint. After capacitors and reactors are switched in, they will affect the reactive power distribution of the system, and thus also affect the active power of the generator, the node voltage, and the branch power flow.

[0075] The power flow balance constraint can be:

[0076]

[0077] where P g,y (x) is the active power generation of the y-th bus, P d,y is the active power load of the y-th bus, V y (x) is the voltage amplitude of the y-th bus, V j(x) is the voltage amplitude of the j-th bus, θ yj is the phase angle difference between the y-th bus and the j-th bus, G yj (x) is the real part of the element of the nodal admittance matrix between the y-th bus and the j-th bus, B yj (x) is the imaginary part of the element of the nodal admittance matrix between the y-th bus and the j-th bus, N is the total number of buses, Q g,y (x) is the reactive power generation of the y-th bus, Q d,y is the reactive power load of the y-th bus. The bus in the preset constraint conditions can be the bus in the power system, and the total number of buses can be the total number of buses in the power system; the buses in the power system can include the buses of the target new energy base and the external system. The power system can include the target new energy base and the external system. The buses of the target new energy base can be divided into monitored buses and unmonitored buses, and the external system also includes buses, branches, generators, and loads, etc.

[0078] The active and reactive power output constraints of the generator can be:

[0079]

[0080] Among them, P g,y (x) is the active power generation of the y-th bus, Q g,y (x) represents the reactive power generation of the y-th bus, is the lower limit of the active power generation of the y-th bus, is the upper limit of the active power generation of the y-th bus, is the lower limit of the reactive power generation of the y-th bus, is the upper limit of the reactive power generation of the y-th bus.

[0081] The node voltage constraints can be:

[0082]

[0083] Among them, V y (x) is the voltage amplitude of the y-th bus, is the lower limit of the voltage amplitude of the y-th bus, is the upper limit of the voltage amplitude of the y-th bus.

[0084] The thermal stability constraints of the line and transformer can be:

[0085]

[0086] Among them, P yj (x) is the active power at the head of the branch y-j, P jy (x) is the active power at the end of the branch y-j, is the lower limit of the active power of branch y-j, and is the upper limit of the active power of branch y-j. The branch can be a branch in the above power system.

[0087] The switching group number constraint, that is, the switching group number constraint of the capacitor / reactance, can be:

[0088]

[0089] where x i is the number of switched-in groups of the i-th reactive power compensation device, is the lower limit of the number of switched-in groups of the i-th reactive power compensation device, and is the upper limit of the number of switched-in groups of the i-th reactive power compensation device.

[0090] To improve the reliability of reactive power compensation in the new energy base, as Figure 2 shown, in one embodiment, step 300 includes:

[0091] Step 301: When the minimum value of the obtained objective function is applied, the number of switched-in groups of each capacitor is used to perform the switching of each capacitor.

[0092] Step 302: When the minimum value of the obtained objective function is applied, the number of switched-in groups of each reactor is used to perform the switching of each reactor, and the reactive power compensation of the target new energy base is completed.

[0093] For example, a 40 Mvar capacitor includes 5 groups of 8 Mvar, and the input capacity (8 Mvar, 16 Mvar, 24 Mvar, 32 Mvar, 40 Mvar) can be adjusted by inputting different numbers of groups. Assuming that when the minimum value of the objective function is obtained, the number of switched-in groups of the 40 Mvar capacitor is 16 Mvar, then two groups of the 40 Mvar capacitor can be selected for input.

[0094] To further illustrate the present solution, the present application provides an application example of the reactive power compensation method, which is specifically described as follows:

[0095] Step 1: Input the base-state power grid model data, and specify the set S of stations I in the research area, I the set G of new energy units GI and their output P E the set G of units outside the area GE and their output P m the voltage monitoring node B spec and the voltage setting value V

[0096] (1) The network model data includes: network power flow calculation data, switchable capacitor / reactance data, etc., which can perform initial power flow calculations.

[0097] (2) The list of substations S in the study area I includes: new energy substations and new energy collection stations. The number of switched-in groups of capacitors / reactors in the substation is used as the decision vector x.

[0098] (3) The output matrix P of new energy units GI defines different output levels of selected new energy units, and P GE defines the output scheme of the corresponding external balancing units to maintain the overall power generation balance of the system. Among them, P GI and P GE Each column corresponds to a power flow calculation example.

[0099] Step 2: According to the output vectors (or matrices) P of new energy units and external units in the study area GI and P GE , automatically generate power flow calculation examples.

[0100] Step 3: For the generated power flow calculation examples, construct an optimization model for the capacitor / reactance switching scheme. The functions realized by the optimization model for the capacitor / reactance switching scheme can be equivalent to the functions realized by the above switching scheme optimization model.

[0101] (I) Objective function

[0102] The optimization objective is to minimize the sum of the squares of the deviations between the voltage amplitudes of all selected monitoring buses (i.e., key buses) and their set values to ensure that the bus voltages in the network are at a reasonable level after the output of new energy units changes. The optimization objective is:

[0103]

[0104] x = (x1, x2, ……, x i , ……, x n )

[0105] Among them, the decision variable x i represents the number of switched-in groups of the i-th capacitor / reactance. Obviously, the optimization model for the capacitor / reactance switching scheme is an integer programming problem.

[0106] (II) Constraints include:

[0107] Power flow balance constraints, active and reactive power output constraints of generators, node voltage constraints, thermal stability constraints of lines and transformers, and constraints on the number of switched-in groups of capacitors / reactors.

[0108] Step 4: Solve the above integer programming problem to obtain the grouping numbers of each capacitor and reactor.

[0109] To further illustrate the present solution, the present application takes a new energy base in a certain area as an example to provide an example of a reactive power compensation method:

[0110] This area includes 20 new energy power stations, with a total of 43 groups of capacitors / reactors. 21 voltage monitoring points are selected on the 220 kV busbar, and The method proposed by the present application is used to optimize the switching schemes of capacitors / reactors for two cases where the coincidence rate is equal to 0.4 and the coincidence rate is equal to 0.9 respectively.

[0111] Figure 4 and Figure 6 In each of the two bar graphs corresponding to each voltage monitoring node in Figure 3 and Figure 4 , the left bar graph represents the voltage amplitude before using the reactive power compensation method of the present solution, and the right bar graph represents the voltage amplitude after using the reactive power compensation method of the present solution. As shown in Figure 3 and Figure 5 and Figure 6 which show the number of capacitor / reactors put into operation when the coincidence rate is equal to 0.4. Through the combined action of two reactors at the 500 kV collection station and three capacitors at the new energy power stations, after optimization using the present solution, the voltages of each voltage monitoring node are overall reduced to a level closer to the set value. Figure 5 Before using the reactive power compensation method of the present solution, the number of operating groups of each capacitor and reactor corresponding thereto is zero. In contrast, as shown in

[0112] and Figure 7 which show the number of capacitor / reactors put into operation when the coincidence rate is equal to 0.9. When there is a large output of new energy and more reactive power support is required, at this time, through the combined action of a total of four capacitors at the 500 kV collection station and the new energy power stations, the voltages of each voltage monitoring node can be overall increased to a level closer to the set value. The voltage monitoring node can be equivalent to the above-mentioned monitoring busbar. Figure 5 Before using the reactive power compensation method of the present solution, the number of operating groups of each capacitor and reactor corresponding thereto is zero.

[0112] At the software level, in order to improve the accuracy of the grouped switching of capacitors and reactors, and further improve the reliability of reactive power compensation, the present application provides an embodiment of a reactive power compensation device for implementing all or part of the content in the reactive power compensation method. Refer to Figure 7 The reactive power compensation device specifically includes the following content:

[0113] An acquisition module 01, configured to acquire the voltage amplitude and set value of the monitoring busbar in the target new energy base;

[0114] An adjustment module 02, configured to input the voltage amplitude of the monitored busbar and the set value into the objective function of a preset switching scheme optimization model, and adjust the number of switching groups of multiple capacitors and the number of switching groups of multiple reactors of the target new energy base in the objective function until the minimum value of the objective function is obtained when the objective function satisfies the preset constraint conditions;

[0115] A reactive power compensation module 03, configured to complete the reactive power compensation of the target new energy base by applying the number of switching groups of each capacitor and the number of switching groups of each reactor when the minimum value of the objective function is obtained.

[0116] In one embodiment, the objective function of the preset switching scheme optimization model is:

[0117]

[0118] x = (x1, x2, ……, x i , ……, x n )

[0119] where x is a vector composed of the number of switching groups of each capacitor and reactor, x i is the number of switching groups of the i-th reactive power compensation device, any reactive power compensation device is a capacitor or a reactor, n is the total number of capacitors and reactors, V k (x) is the voltage amplitude of the k-th monitored busbar, is the voltage set value of the k-th monitored busbar, w k is the weight coefficient of the k-th monitored busbar, and N m is the total number of monitored busbars.

[0120] In one embodiment, the preset constraint conditions include:

[0121] Power flow balance constraint, generator active and reactive power output constraint, node voltage constraint, line and transformer thermal stability constraint, and switching group number constraint.

[0122] As Figure 8 shown, in one embodiment, the reactive power compensation module includes:

[0123] A first switching unit 031, configured to perform the switching of each capacitor by applying the number of switching groups of each capacitor when the minimum value of the objective function is obtained;

[0124] A second switching unit 032, configured to perform the switching of each reactor by applying the number of switching groups of each reactor when the minimum value of the objective function is obtained, and complete the reactive power compensation of the target new energy base.

[0125] In one embodiment, the power flow balance constraint is as follows:

[0126]

[0127] where P g,y (x) is the active power generation of the y-th bus, P d,y is the active power load of the y-th bus, V y (x) is the voltage magnitude of the y-th bus, V j (x) is the voltage magnitude of the j-th bus, θ yj is the phase angle difference between the y-th bus and the j-th bus, G yj (x) is the real part of the element of the nodal admittance matrix between the y-th bus and the j-th bus, B yj (x) is the imaginary part of the element of the nodal admittance matrix between the y-th bus and the j-th bus, N is the total number of buses, Q g,y (x) is the reactive power generation of the y-th bus, Q d,y is the reactive power load of the y-th bus.

[0128] In one embodiment, the active and reactive power output constraints of the generator are as follows:

[0129]

[0130] where P g,y (x) is the active power generation of the y-th bus, Q g,y (x) represents the reactive power generation of the y-th bus, is the lower limit of the active power generation of the y-th bus, is the upper limit of the active power generation of the y-th bus, is the lower limit of the reactive power generation of the y-th bus, is the upper limit of the reactive power generation of the y-th bus.

[0131] In one embodiment, the node voltage constraint is as follows:

[0132]

[0133] where V y (x) is the voltage magnitude of the y-th bus, is the lower limit of the voltage magnitude of the y-th bus, is the upper limit of the voltage magnitude of the y-th bus.

[0134] The embodiments of the reactive power compensation device provided in this specification can specifically be used to execute the processing procedures of the embodiments of the above reactive power compensation method, and its functions will not be elaborated here. For details, reference can be made to the detailed description of the embodiments of the above reactive power compensation method.

[0135] Figure 9 Schematic diagram of the physical structure of the electronic device provided by an embodiment of the present invention, as Figure 9 shown. The electronic device includes: a memory 901, a processor 902, and a computer program stored on the memory 901 and executable on the processor 902. When the processor 902 executes the computer program, the following method is implemented:

[0136] Obtain the voltage amplitude and set value of the monitored busbar in the target new energy base;

[0137] Input the voltage amplitude and set value of the monitored busbar into the objective function of a preset switching scheme optimization model, and adjust the number of switching groups of multiple capacitors and the number of switching groups of multiple reactors of the target new energy base in the objective function until the minimum value of the objective function is obtained under the condition that the objective function satisfies the preset constraint conditions;

[0138] Apply the number of switching groups of each capacitor and the number of switching groups of each reactor when the minimum value of the objective function is obtained to complete the reactive power compensation of the target new energy base.

[0139] This embodiment discloses a computer program product. The computer program product includes a computer program, and when the computer program is executed by a processor, the following method is implemented:

[0140] Obtain the voltage amplitude and set value of the monitored busbar in the target new energy base;

[0141] Input the voltage amplitude and set value of the monitored busbar into the objective function of a preset switching scheme optimization model, and adjust the number of switching groups of multiple capacitors and the number of switching groups of multiple reactors of the target new energy base in the objective function until the minimum value of the objective function is obtained under the condition that the objective function satisfies the preset constraint conditions;

[0142] Apply the number of switching groups of each capacitor and the number of switching groups of each reactor when the minimum value of the objective function is obtained to complete the reactive power compensation of the target new energy base.

[0143] This embodiment provides a computer-readable storage medium. The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the following method is implemented:

[0144] Obtain the voltage amplitude and set value of the monitored busbar in the target new energy base;

[0145] Input the voltage amplitude of the monitored busbar and the set value into the objective function of a preset switching scheme optimization model, and adjust the number of capacitor input groups and the number of reactor input groups of the target new energy base in the objective function until the minimum value of the objective function is obtained under the condition that the objective function meets the preset constraints.

[0146] Apply the number of input groups of each capacitor and the number of input groups of each reactor when the minimum value of the objective function is obtained to complete the reactive power compensation of the target new energy base.

[0147] Those skilled in the art should understand that the embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0148] The present invention is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram can be implemented by computer program instructions, and the combination of the processes and / or blocks in the flowchart and / or block diagram can also be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in one Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0149] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including instruction means, and the instruction means implements the functions specified in one Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0150] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process. Therefore, the instructions executed on the computer or other programmable device provide means for implementing the functions specified in one Figure 1 one process or multiple processes and / or blocksFigure 1 Steps of functions specified in one or more boxes.

[0151] In the description of this specification, descriptions with reference to terms such as "one embodiment", "one specific embodiment", "some embodiments", "for example", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0152] The above-described specific embodiments have further elaborated on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A reactive power compensation method, characterized in that: include: Obtain the voltage amplitude and set value of the monitoring bus in the target new energy base; Inputting the voltage amplitude and set value of the monitoring bus into the objective function of a preset switching scheme optimization model, adjusting the number of investment groups of multiple capacitors and the number of investment groups of multiple reactors of the target new energy base in the objective function, until the minimum value of the objective function is obtained under the preset constraint condition that the objective function satisfies the preset constraint condition; When the minimum value of the objective function is obtained, the number of groups of each capacitor put into operation and the number of groups of each reactor put into operation are adjusted to complete reactive power compensation of the target new energy base.

2. The reactive power compensation method according to claim 1, characterized in that: The objective function of the preset switching scheme optimization model is: Wherein, x is a vector consisting of the number of groups of capacitors and reactors put into use, x i is the number of groups of reactive power compensation equipment put into use, any of the reactive power compensation equipment is a capacitor or a reactor, n is the total number of capacitors and reactors, V k (x) is the voltage amplitude of the kth monitoring bus, is the voltage setting value of the kth monitoring bus, w k is the weight coefficient of the kth monitoring bus, N m The total number of monitored buses.

3. The reactive power compensation method according to claim 1, characterized in that: The preset constraints include: Power flow balance constraints, generator active and reactive output constraints, node voltage constraints, line and transformer thermal stability constraints, and switching group number constraints.

4. The reactive power compensation method according to claim 1, characterized in that: When the application obtains the minimum value of the objective function, the number of groups of each capacitor and the number of groups of each reactor are completed to complete reactive power compensation of the target new energy base, including: When the minimum value of the objective function is obtained, the number of groups of each capacitor is grouped and the switching of each capacitor is performed; When the minimum value of the objective function is obtained, the number of groups of each reactor is divided, and the switching of each reactor is performed to complete the reactive power compensation of the target new energy base.

5. The reactive power compensation method according to claim 3, characterized in that: The power flow balance constraint is: Among them, P g,y (x) is the active power generated by the yth bus, P d,y is the load active power of the yth bus, V y (x) is the voltage amplitude of the yth bus, V j (x) is the voltage amplitude of the jth bus, θ yj is the phase difference between the yth busbar and the jth busbar, G yj (x) is the real part of the node admittance matrix element between the yth busbar and the jth busbar, B yj (x) is the imaginary part of the node admittance matrix element between the yth bus and the jth bus, N is the total number of buses, Q g,y (x) is the reactive power of the y-th busbar, Q d,y is the reactive power of the load on the yth bus.

6. The reactive power compensation method according to claim 3, characterized in that: The active and reactive output constraints of the generator are: Among them, P g,y (x) is the active power generated by the y-th bus, Q g,y (x) represents the reactive power generated by the yth bus, is the lower limit of the active power generation of the yth bus, is the upper limit of the active power generation of the y-th bus, is the lower limit of reactive power generation of the yth bus, is the upper limit of reactive power generation of the y-th bus.

7. The reactive power compensation method according to claim 3, characterized in that: The node voltage constraint is: Among them, V y (x) is the voltage amplitude of the y-th bus, is the lower limit of the voltage amplitude of the y-th bus, is the upper limit of the voltage amplitude of the yth bus.

8. A reactive power compensation device, characterized in that: include: An acquisition module, used to acquire the voltage amplitude and set value of the monitoring bus in the target new energy base; An adjustment module, used for inputting the voltage amplitude and set value of the monitoring bus into the objective function of a preset switching scheme optimization model, adjusting the number of investment groups of multiple capacitors and the number of investment groups of multiple reactors of the target new energy base in the objective function, until the minimum value of the objective function is obtained under the preset constraint condition that the objective function satisfies the preset constraint condition; The reactive power compensation module is used to apply the number of investment groups of each capacitor and the number of investment groups of each reactor when the minimum value of the objective function is obtained to complete the reactive power compensation of the target new energy base.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the reactive power compensation method described in any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium having computer instructions stored thereon, characterized in that: When the instructions are executed by the processor, the reactive power compensation method described in any one of claims 1 to 7 is implemented.

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