A method and system for configuring controllable phase shifters in a power grid

Abstract

The application discloses a controllable phase shifter configuration method and system in a power grid, and the method comprises the following steps: forming a configuration scheme set of the controllable phase shifter; constructing a steady-state mathematical model of power flow of the controllable phase shifter considering the structural characteristics of the controllable phase shifter; performing power flow calculation under each configuration scheme in the configuration scheme set based on the steady-state mathematical model, and obtaining the wind power accommodation rate, the line load rate and the load demand under each configuration scheme; constructing an evaluation system for the configuration of the controllable phase shifter; based on the calculated wind power accommodation rate, the line load rate and the load demand under each configuration scheme, the feature vector method is adopted to obtain the scores of different configuration schemes under the evaluation system, and the configuration scheme with the highest score is selected as the final configuration scheme. The method can effectively solve the power flow dispersion problem caused by the access of new energy, and improve the safety and economy of power grid operation.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of new energy, and particularly relates to a controllable phase shifter configuration method and system in a power grid. BACKGROUND

[0002] A phase shifter is a device used to control the flow of power and voltage in a power system, widely used in power grids to improve the stability and reliability of the power system. It controls the flow of current by adjusting the phase angle, thereby optimizing the flow of power. Its core function is to change the phase of the phase voltage in the power system to control the direction and size of power flow. By changing the phase, the flow of power in the power system can be optimized, reducing losses and improving transmission efficiency. With the rapid development of renewable energy, the management of power flow in the power grid has become increasingly complex. The volatility of wind and solar energy makes the power system need more flexible power flow control means to maintain the stability and reliability of the system. Phase shifters have important applications in power dispatching, fault isolation, load distribution, etc. By reasonably configuring the phase shifter, the optimal distribution of power flow in the power grid can be achieved, reducing the operating cost of the power grid. The design and control strategy of the phase shifter are relatively complex, which requires high-level technical support and maintenance, which to some extent limits its wide application. When the phase shifter is connected to the power grid, it may cause transient and steady-state stability problems of the system, such as oscillation and phase locking problems. Precise control and adjustment are needed to avoid instability. The compatibility of the phase shifter with traditional power equipment may cause suboptimal cooperative operation between devices, affecting the overall power flow optimization effect. The connection of the phase shifter needs to be considered in detail in the power grid planning stage to ensure that it can be effectively integrated into the existing system, which poses a challenge to the long-term development and planning of the power grid.

[0003] In the existing power grid, the configuration method of controllable phase shifter mainly includes empirical configuration, linear optimization method and intelligent algorithm, etc. The empirical configuration method usually relies on the experience of engineers and historical data for configuration, although it is effective in some cases, but it often lacks scientificity and systematicness. This method often ignores the dynamic characteristics of the power grid and real-time load changes, resulting in insufficient flexibility of the configured power grid in dealing with load fluctuations, and easy to cause power flow imbalance. The linear optimization method assumes that the behavior of the power system is linear, which is not always true in practice. This method often ignores the nonlinear characteristics and interactions of the system, resulting in optimization results that cannot reflect the true situation of the power grid, thereby causing potential stability problems. Intelligent algorithms (such as genetic algorithm, particle swarm optimization, etc.) can theoretically provide better configuration schemes, but in practical applications, they often require a large amount of computing resources and time. In addition, these algorithms still have some uncertainty in convergence and guarantee of global optimal solution. Therefore, the phase shifter configured by using the existing intelligent algorithm may have instability or substandard performance problems in actual operation.

[0004] Due to the deficiencies of the existing phase shifter, the configured power grid can appear uneven power flow distribution, insufficient dynamic response and reduced stability, so that the configuration method lacks comprehensive understanding and adaptability to the complexity of the power grid. SUMMARY

[0005] To solve the problems in the prior art, the present application provides a controllable phase shifter configuration method and system in a power grid.

[0006] The technical scheme of the present application is as follows:

[0007] A controllable phase shifter configuration method in a power grid, the controllable phase shifter is installed in a power grid with a new energy field station connected, comprising:

[0008] Forming a configuration scheme set of the controllable phase shifter, the configuration scheme set includes a plurality of configuration schemes related to configuration quantity, configuration position, configuration capacity and adjustment phase;

[0009] Building a steady-state mathematical model of controllable phase shifter access power flow considering the structural characteristics of controllable phase shifter;

[0010] Based on the steady-state mathematical model, the power flow calculation under each configuration scheme in the configuration scheme set is carried out, and the wind power consumption rate, line load rate for reflecting transmission capacity and load demand under each configuration scheme are obtained.

[0011] Building an evaluation system for controllable phase shifter configuration, the evaluation system takes the comprehensive score of configuration scheme related to wind power consumption rate, investment cost, operation cost, transmission capacity, load demand and power supply location as the target layer, and takes the wind power consumption rate criterion, investment cost criterion, operation cost criterion, transmission capacity criterion, load demand criterion and power supply location criterion as the criterion layer, and takes a plurality of configuration schemes as the scheme layer.

[0012] Based on the calculated wind power consumption rate, line load rate and load demand under each configuration scheme, the feature vector method is used to obtain the score of different configuration schemes under the evaluation system, and the configuration scheme with the highest score is selected as the final configuration scheme.

[0013] Further, the expression of the steady-state mathematical model of controllable phase shifter access power flow considering the structural characteristics of controllable phase shifter is:

[0014]

[0015] U 1p =U1+U p

[0016] θ 1p =θ+Δθ

[0017] wherein I c is the output current of the phase shifter; I r is the input current of the phase shifter; is the phase shift angle; U 1p is the grid voltage after the phase shifter; U1 is the grid voltage before the phase shifter; T is the complex ratio of the phase shifter; U p is the voltage drop; θ 1p is the phase of the node voltage after the phase shifter; θ is the phase of the node voltage before the phase shifter; Δθ is the change of the phase of the node voltage after the phase shifter; j is the imaginary unit; e is the base of the natural logarithm.

[0018] Further, the step of performing power flow calculation under each configuration scheme in the configuration scheme set based on the steady-state mathematical model comprises:

[0019] The node injection power under the configuration scheme without the controllable phase shifter is calculated by the following formula:

[0020]

[0021] wherein P i is the active injection of the ith node; U i is the voltage amplitude of the node i; U j is the voltage of the grid node j; G ij is the mutual conductance between the node i and the node j; θ i is the phase angle of the node i voltage after the phase shifter; θ j is the phase angle of the node j voltage; B ij is the mutual susceptance between the node i and the node j; Q i is the reactive injection of the ith node;

[0022] The node injection power under the configuration scheme with the controllable phase shifter is calculated by the following formula:

[0023]

[0024] G ijp = G ij + G cij

[0025] B ijp = B ij + B cij

[0026] wherein P ip is the active injection of the ith node with the phase shifter; U ip is the voltage amplitude of the node with the phase shifter; U j is the voltage of the grid node j; Gijp is the mutual conductance between node i and node j with phase shifter; θ ip is the phase angle of node i voltage after connecting phase shifter; θ j is the phase angle of node j voltage; B ijp is the mutual conductance between node i and node j with phase shifter; Q ip is the injected reactive power of the i th node; G ij is the mutual conductance between node i and node j without phase shifter; B ij is the mutual conductance between node i and node j; G cij is the mutual conductance gain between node i and node j with phase shifter; B cij is the mutual conductance gain between node i and node j with phase shifter.

[0027] According to the known information of each power grid node, the power grid nodes are classified by using Newton-Raphson method, the voltage initial value is set, the power imbalance is calculated, the voltage correction is solved by iteration until the power imbalance is less than a given minimum value, the voltage amplitude and phase of each power grid node are obtained, and the power flow distribution under different configuration schemes is obtained.

[0028] Further, the wind power consumption rate, the line load rate for reflecting the transmission capacity, and the load demand quantity under each configuration scheme are obtained by the following steps:

[0029] Based on the injected active power and the injected reactive power of each node obtained by the power flow calculation, the power of each line in the power grid and the power of each load node are calculated, and the wind power consumption rate, the line load rate, and the load demand quantity are further obtained in combination with the maximum transmission power of the power grid.

[0030] Further, the calculation method of the wind power consumption rate criterion in the evaluation system for the configuration of the controllable phase shifter is as follows:

[0031]

[0032] In the formula, WSR is the wind power consumption rate; P con is the actual consumed wind power; P wind is the total wind power generation; P i is the power of the i th line in the power grid, P out is the power transmitted by the power grid; P j is the power of the load node j in the power grid, P load is the total load of the power grid; k is the total number of lines in the power grid; s is the total number of load nodes in the power grid.

[0033] The calculation method of the line load rate criterion is as follows:

[0034]

[0035] wherein, TC is the line load rate, P out is the power transmitted by the power grid, P max is the maximum transmission power of the power grid;

[0036] The calculation method of the load demand criterion is as follows:

[0037]

[0038] wherein, LD is the load demand, P j is the power of the load node j in the power grid, P load is the total load of the power grid, and s is the total number of load nodes of the power grid.

[0039] Further, the specific method for obtaining scores under different configuration schemes by using the eigenvector method and selecting the configuration scheme with the highest score as the final configuration scheme comprises:

[0040] An analytic hierarchy process (AHP) judgment matrix A considering the correlation with each criterion is constructed:

[0041]

[0042] wherein, a ij represents the relative importance of criterion i with respect to criterion j, i∈[1, 6], j∈[1, 6];

[0043] Based on the judgment matrix, the weight of the criterion layer in the analytic hierarchy process is calculated by using the eigenvector method, the scores under different configuration schemes are determined, and the configuration scheme with the highest comprehensive score is selected.

[0044] Further, the specific steps for calculating the weight of the criterion layer in the analytic hierarchy process based on the judgment matrix by using the eigenvector method, determining the scores under different configuration schemes, and selecting the configuration scheme with the highest comprehensive score comprise:

[0045] The maximum eigenvalue and the eigenvector of the judgment matrix are calculated according to the eigenvector method:

[0046] A-λI|=0

[0047] Aω=λ max ω

[0048] wherein, λ is the eigenvalue; I is the unit matrix; ω is the eigenvector; λ max is the maximum eigenvalue of the matrix A;

[0049] The eigenvector is normalized so that the sum of the weights is 1, and each element of the normalized eigenvector is the weight:

[0050]

[0051] wherein |ω is the modulus of the eigenvector;

[0052] The comprehensive score of different configuration schemes under different criteria is calculated as follows:

[0053]

[0054] wherein α1, α2, α3, α4, α5 and α6 respectively correspond to the weight representing the wind power consumption rate, the investment cost, the operation cost, the transmission capacity, the load demand and the power supply location; S is the comprehensive score; Z is the total number of wind turbines connected to the system; W i is the power generation of the i-th wind turbine; W imax is the maximum power generation of the i-th wind turbine; M is the number of investment cost categories; C j is the investment cost of the j-th category; T is the number of time periods; R tj is the operation and maintenance cost of the j-th investment in the t-th year; L is the number of transmission lines; TTC l is the transmission capacity of the l-th line; D load is the demand of the load; D source is the location information of the power supply.

[0055] A controllable phase shifter configuration system in a power grid, the controllable phase shifter is installed in a power grid connected with a new energy station, comprising a configuration scheme forming module, a modeling module, a power flow calculation module, an evaluation system building module and a score acquisition module;

[0056] The configuration scheme forming module is configured to form a configuration scheme set of the controllable phase shifter, the configuration scheme set comprising a plurality of configuration schemes related to the number of configurations, the location of configurations, the capacity of configurations and the adjustment phase;

[0057] The modeling module is configured to build a steady-state mathematical model of the controllable phase shifter access power flow considering the structural characteristics of the controllable phase shifter;

[0058] The power flow calculation module is configured to perform power flow calculation under each configuration scheme in the configuration scheme set based on the steady-state mathematical model, to obtain the wind power consumption rate, the line load rate for reflecting the transmission capacity and the load demand under each configuration scheme;

[0059] The evaluation system construction module is configured to construct an evaluation system for the controllable phase shifter configuration, the evaluation system taking a comprehensive score of the configuration scheme in relation to the wind power consumption rate, the investment cost, the operation cost, the transmission capacity, the load demand and the power supply location as a target layer, taking the wind power consumption rate criterion, the investment cost criterion, the operation cost criterion, the transmission capacity criterion, the load demand criterion and the power supply location criterion as a criterion layer, and taking a plurality of groups of configuration schemes as a scheme layer;

[0060] The score acquisition module is configured to acquire the scores of different configuration schemes under the evaluation system based on the calculated wind power consumption rate, line load rate and load demand amount of each group of configuration schemes by using the eigenvector method, and select the configuration scheme with the highest score as the final configuration scheme.

[0061] An electronic device includes a memory storing a computer program and a processor configured to invoke and run the computer program stored in the memory to perform the method of any one of the above.

[0062] A computer readable storage medium stores a computer program, which, when executed by a processor, implements the steps of the method of any one of the above.

[0063] Compared with the prior art, the present application has the following beneficial effects:

[0064] The present application provides a controllable phase shifter configuration method and system in a power grid, which adopts an accurate steady-state mathematical model and optimization of power flow after the phase shifter is connected to the power grid, and can effectively solve the power flow dispersion problem caused by the connection of new energy and improve the safety and economy of power grid operation.

[0065] The steady-state mathematical model of the controllable phase shifter connected to the power flow constructed in the method of the present application considers the structural characteristics of the controllable phase shifter, so it can solve the problem of low accuracy of power flow calculation caused by the fact that the existing configuration method does not fully consider the structural characteristics of the phase shifter, realize the accuracy and reliability of power flow calculation under the configuration scheme, and ensure the effectiveness of the configuration scheme; at the same time, based on the analytic hierarchy process, the present application comprehensively considers different configuration scheme sets, solves the problem that the configuration scheme is single in the existing method and it is difficult to comprehensively evaluate various possible configuration schemes, realizes comprehensive evaluation of the advantages and disadvantages of different configuration schemes from multiple dimensions, and improves the scientificity and rationality of the configuration decision. BRIEF DESCRIPTION OF DRAWINGS

[0066] Figure 1 The flowchart of the controllable phase shifter configuration method in the embodiment in a power grid. DETAILED DESCRIPTION

[0067] The present application will be further illustrated below in conjunction with the accompanying drawings and specific embodiments, it should be understood that these embodiments are only used to illustrate the present application and are not used to limit the scope of the present application, and after reading the present application, various modifications of the present application by those skilled in the art are within the scope defined by the appended claims.

[0068] Embodiment one:

[0069] The configuration method of the controllable phase shifter in the power grid, the controllable phase shifter is installed in the power grid with the new energy station connected, and is used for adjusting the grid connection capability of the new energy station and the accommodation capability of the power grid, and the method comprises the following steps:

[0070] Form a configuration scheme set of the controllable phase shifter, the configuration scheme set comprises a plurality of groups of configuration schemes related to configuration quantity, configuration position, configuration capacity and adjustment phase;

[0071] A steady-state mathematical model of controllable phase shifter access power flow considering the structural characteristics of controllable phase shifter is constructed;

[0072] Based on the steady-state mathematical model, the power flow calculation under each group of configuration schemes in the configuration scheme set is carried out, and the wind power consumption rate, the line load rate for reflecting the transmission capacity and the load demand under each group of configuration schemes are obtained;

[0073] An evaluation system for controllable phase shifter configuration is constructed, the evaluation system takes the comprehensive score of the configuration scheme related to the wind power consumption rate, the investment cost, the operation cost, the transmission capacity, the load demand and the power supply position as the target layer, and takes the wind power consumption rate criterion, the investment cost criterion, the operation cost criterion, the transmission capacity criterion, the load demand criterion and the power supply position criterion as the criterion layer, and takes a plurality of groups of configuration schemes as the scheme layer;

[0074] Based on the calculated wind power consumption rate, line load rate and load demand under each group of configuration schemes, the feature vector method is adopted to obtain the score of different configuration schemes under the evaluation system, and the configuration scheme with the highest score is selected as the final configuration scheme.

[0075] Embodiment two:

[0076] Generally, the double-core symmetrical controllable phase shifter is mainly composed of series transformers, parallel transformers and thyristor controllers, and in the present embodiment, the expression of the steady-state mathematical model of controllable phase shifter access power flow considering the structural characteristics of controllable phase shifter is:

[0077]

[0078] U 1p =U1+U p

[0079] θ1p = θ + Δθ

[0080] wherein I c is the output current of the phase shifter; I r is the input current of the phase shifter; is the phase shift angle; U 1p is the grid voltage after the phase shifter is connected; U1 is the grid voltage before the phase shifter is connected; T is the complex ratio of the phase shifter; U p is the voltage drop; θ 1p is the phase of the node voltage after the phase shifter is connected; θ is the phase of the node voltage before the phase shifter is connected; Δθ is the change of the phase of the node voltage after the phase shifter is connected; j is the imaginary unit; e is the base of the natural logarithm.

[0081] According to the fact that the power loss is equivalent to the power loss generated by the effective current flowing through the equivalent impedance, the equivalent model of the controllable phase shifter can be a series connection of an ideal phase shifter with a variable impedance, and the complex ratio of the ideal phase shifter.

[0082] The intermittence and randomness of the new energy itself lead to unstable power generation, which further affects the power flow distribution of the power grid. At the same time, the new energy generation facilities are usually located in remote areas and need to be connected to the power grid through long-distance transmission lines, which increases the loss and the difficulty of power flow control of the power grid. The factors affecting the power flow dispersion of the new energy are the type and location of the power source, the load demand and the control strategy. According to the input-output relationship of the phase shifter, the power flow of the new energy system after the phase shifter is connected can be obtained. The phase shifter controls the amplitude and phase of the voltage on the line by injecting a compensation voltage U p at the line port. The voltage before compensation is U1, and the amplitude and phase angle of the voltage after compensation are shown in the above formula.

[0083] Embodiment Three

[0084] The embodiment is further designed on the basis of the embodiment two, and in the embodiment, based on the steady-state mathematical model, the power flow calculation steps of each configuration scheme in the configuration scheme set include:

[0085] The following formula is used to calculate the node injection power without connecting the controllable phase shifter in the configuration scheme:

[0086]

[0087] wherein P i is the active injection of the i-th node; U i is the voltage amplitude of node i; U j is the voltage of grid node j; G ij is the mutual conductance between node i and node j; θ i is the phase angle of the voltage of node i after the phase shifter is connected; θ jis the voltage phase angle of node j; B ij is the mutual conductance between node i and node j; Q i is the injected reactive power of the ith node; the injected power of the node with the controllable phase shifter under the configuration scheme is further calculated by using the following formula:

[0088]

[0089] G ijp =G ij +G cij

[0090] B ijp =B ij +B cij

[0091] in the formula, P ip is the injected active power of the ith node with the phase shifter; U ip is the voltage amplitude of the node with the phase shifter; U j is the voltage of the grid node j; G ijp is the mutual conductance between node i and node j with the phase shifter; θ ip is the phase angle of the voltage of node i after the phase shifter is connected; θ j is the voltage phase angle of node j; B ijp is the mutual conductance between node i and node j with the phase shifter; Q ip is the injected reactive power of the ith node; G ij is the mutual conductance between node i and node j without the phase shifter; B ij is the mutual conductance between node i and node j; G cij is the mutual conductance gain between node i and node j with the phase shifter; B cij is the mutual conductance gain between node i and node j with the phase shifter;

[0092] With the grid node power, voltage, and the configuration number, configuration location, configuration capacity, and adjustment phase of the controllable phase shifter in the configuration scheme, the Newton-Raphson method is used to classify the nodes according to the known information of each grid node (which generally includes the voltage phase amplitude and the injected power), set the initial voltage value, calculate the power imbalance, solve the voltage correction amount by iteration until the power imbalance is less than a given minimum value, and obtain the voltage amplitude and phase of each grid node, and further obtain the power flow distribution under different configuration schemes.

[0093] Embodiment Four

[0094] In this embodiment, the steps of obtaining the wind power consumption rate, the line load rate for reflecting the transmission capacity, and the load demand under each group of configuration schemes are as follows:

[0095] Based on the injection active power and injection reactive power of each node obtained by the power flow calculation, the power of each line in the power grid and the power of each load node are calculated, and combined with the maximum transmission power of the power grid, the wind power accommodation rate, the line load rate and the load demand are further obtained.

[0096] Embodiment five:

[0097] The example is further designed on the basis of embodiment four, and the calculation method of the wind power accommodation rate criterion in the evaluation system for the controllable phase shifter configuration in the example is as follows:

[0098]

[0099] In the formula, WSR is the wind power accommodation rate; P con is the actual accommodated wind power; P wind is the total wind power generation; P i is the power of the i-th line in the power grid, P out is the power transmitted by the power grid; P j is the power of the j-th load node in the power grid, P load is the total load of the power grid; k is the total number of lines in the power grid; s is the total number of load nodes in the power grid;

[0100] The calculation method of the investment cost criterion is as follows:

[0101] IC=C eq +C inst

[0102] In the formula, IC is the investment cost, C eq is the equipment cost, C inst is the installation cost;

[0103] The calculation method of the operation cost criterion is as follows:

[0104]

[0105] In the formula, OC is the operation cost, C maint is the maintenance cost, C op is the operation cost, and T is the evaluation period;

[0106] The calculation method of the line load rate criterion is as follows:

[0107]

[0108] In the formula, TC is the line load rate, P out is the power transmitted by the power grid, P max is the maximum transmission power of the power grid;

[0109] The calculation method of the load demand criterion is as follows:

[0110]

[0111] In the formula, LD is the load demand, Pj is the power of the j load node in the power grid, P load is the total load of the power grid, and N is the total number of load nodes of the power grid.

[0112] The calculation method of the power source position criterion is as follows:

[0113]

[0114] In the formula, PP is the power source position influence, di is the distance from the i th power source to the nearest load center, wi is the power source weight, and M represents the number of power sources.

[0115] Embodiment six:

[0116] The embodiment is further designed on the basis of embodiment five, and in the embodiment, the feature vector method is used to obtain scores under different configuration schemes, and the specific method of selecting the configuration scheme with the highest score as the final configuration scheme includes the following steps:

[0117] The analytic hierarchy process is used to construct a judgment matrix A related to each criterion:

[0118]

[0119] In the formula, ai,j represents the relative importance of criterion i with respect to criterion j, i∈[1,6], and j∈[1,6]; ij

[0120] Based on the judgment matrix, the weight of the criterion layer in the analytic hierarchy process is calculated by using the feature vector method, the scores under different configuration schemes are determined, and the configuration scheme with the highest comprehensive score is selected.

[0121] Embodiment seven:

[0122] The embodiment is further designed on the basis of embodiment six, and in the embodiment, the specific steps of calculating the weight of the criterion layer in the analytic hierarchy process by using the feature vector method based on the judgment matrix, determining the scores under different configuration schemes, and selecting the configuration scheme with the highest comprehensive score include the following steps:

[0123] The maximum eigenvalue and the eigenvector of the judgment matrix are calculated according to the feature vector method:

[0124] A-λI|=0

[0125] Aω=λ max ω

[0126] In the formula, λ is the eigenvalue; I is the unit matrix; ω is the eigenvector; λ max ​is the maximum eigenvalue of the matrix A;the eigenvector is normalized so that the sum of the weights is 1, and each element of the normalized eigenvector is the weight:

[0127]

[0128] where |ω is the norm of the eigenvector;

[0129] The comprehensive score of different configuration schemes under different criteria is calculated as follows:

[0130]

[0131] where α1, α2, α3, α4, α5 and α6 respectively correspond to the weights representing the wind power consumption rate, investment cost, operation cost, transmission capacity, load demand and power supply location. S is the comprehensive score; Z is the total number of wind turbines connected to the system; W i is the power generation of the i-th wind turbine; W imax is the maximum power generation of the i-th wind turbine; M is the number of investment cost categories; C j is the investment cost of the j-th category; T is the number of time periods; R tj is the operation and maintenance cost of the j-th investment in the t-th year; L is the number of transmission lines; TTC l is the transmission capacity of the l-th line; D load is the demand of the load; D source is the location information of the power supply.

[0132] Embodiment Eight:

[0133] The controllable phase shifter configuration system in the power grid of the application is installed in the power grid connected to the new energy station, and is used to adjust the grid connection capacity of the new energy station and the accommodation capacity of the power grid, and comprises a configuration scheme forming module, a modeling module, a power flow calculation module, an evaluation system building module and a score obtaining module;

[0134] The configuration scheme forming module is used to form a configuration scheme set of the controllable phase shifter, and the configuration scheme set comprises a plurality of groups of configuration schemes related to the configuration number, the configuration location, the configuration capacity and the adjustment phase;

[0135] The modeling module is used to build a steady-state mathematical model of the controllable phase shifter access power flow considering the structural characteristics of the controllable phase shifter;

[0136] The power flow calculation module is used to perform power flow calculation under each group of configuration schemes in the configuration scheme set based on the steady-state mathematical model, to obtain the wind power consumption rate, the line load rate for reflecting the transmission capacity and the load demand under each group of configuration schemes;

[0137] The evaluation system construction module is configured to construct an evaluation system for the controllable phase shifter configuration, the evaluation system taking a comprehensive score of the configuration scheme in relation to a wind power consumption rate, an investment cost, an operation cost, a transmission capacity, a load demand and a power supply location as a target layer, taking a wind power consumption rate criterion, an investment cost criterion, an operation cost criterion, a transmission capacity criterion, a load demand criterion and a power supply location criterion as a criterion layer, and taking a plurality of groups of configuration schemes as a scheme layer;

[0138] The score acquisition module is configured to acquire scores of different configuration schemes under the evaluation system based on the calculated wind power consumption rate, line load rate and load demand under each group of configuration schemes, and select a configuration scheme with the highest score as a final configuration scheme.

[0139] Embodiment Nine

[0140] An electronic device includes a memory and a processor, the memory storing a computer program, and the processor is configured to invoke and run the computer program stored in the memory to execute the method according to any one of the above.

[0141] A computer readable storage medium stores a computer program, and the computer program is executed by a processor to implement the steps of the method according to any one of the above.

[0142] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A method of configuring controllable phase shifters in a power grid, the controllable phase shifters being installed in a power grid to which a new energy plant is connected, characterized by, The application relates to a method for configuring a controllable phase shifter. The method comprises the following steps: forming a configuration scheme set of the controllable phase shifter, wherein the configuration scheme set comprises a plurality of configuration schemes in relation to a configuration quantity, a configuration position, a configuration capacity and an adjustment phase; constructing a steady-state mathematical model of controllable phase shifter access power flow considering the structural features of the controllable phase shifter; based on the steady-state mathematical model, performing power flow calculation under each configuration scheme in the configuration scheme set to obtain a wind power consumption rate, a line load rate for reflecting transmission capacity and a load demand under each configuration scheme; constructing an evaluation system for controllable phase shifter configuration, wherein the evaluation system takes a comprehensive score of the configuration scheme in relation to the wind power consumption rate, investment cost, operation cost, transmission capacity, load demand and power source position as a target layer, takes the wind power consumption rate criterion, investment cost criterion, operation cost criterion, transmission capacity criterion, load demand criterion and power source position criterion as a criterion layer, and takes a plurality of configuration schemes as a scheme layer; 2. The method of claim 1, wherein, based on the calculated wind power consumption rate, line load rate and load demand under each configuration scheme, a feature vector method is adopted to obtain scores of different configuration schemes in the evaluation system, and the configuration scheme with the highest score is selected as a final configuration scheme. U 1p = U1+ U p θ 1p = θ + Δθ In the formula, I c is the phase shifter output current; I r is the input current to the phase shifter; is the phase shift angle; U 1p is the grid voltage after the phase shifter; U1 is the grid voltage before the phase shifter; T is the complex transfer ratio of the phase shifter; U p is the voltage drop; θ 1p is the phase of the node voltage after the phase shifter; θ is the phase of the node voltage before the phase shifter; Δθ is the change in the phase of the node voltage after the phase shifter; j is the imaginary unit; e is the base of the natural logarithm.

3. The method of claim 2, wherein, The expression of the steady-state mathematical model of controllable phase shifter access power flow considering the structural features of the controllable phase shifter is as follows: The specific steps of performing power flow calculation under each configuration scheme in the configuration scheme set based on the steady-state mathematical model comprise the following steps: where P i is the injected active power of the i-th node; U i is the voltage amplitude of the node i; U j is the voltage of the grid node j; G ij is the mutual conductance between the node i and the node j; θ i is the phase angle of the voltage of the node i after connecting the phase shifter; θ j is the phase angle of the voltage of the node j; B ij is the mutual susceptance between the node i and the node j; Q i is the injected reactive power of the i-th node; the node injection power under the configuration scheme without the controllable phase shifter is calculated by using the following formula: G ijp = G ij + G cij B ijp = B ij + B cij where P ip is the active power injected at the node of the i-th phase shifter; U ip is the voltage magnitude at the node of the phase shifter; U j is the voltage at the grid node j; G ijp is the mutual conductance of the phase shifter between node i and node j; θ ip is the phase angle of the voltage at node i after the phase shifter; θ j is the phase angle of the voltage at node j; B ijp is the mutual susceptance of the phase shifter between node i and node j; Q ip is the reactive power injected at the i-th node; G ij is the mutual conductance between node i and node j without the phase shifter; B ij is the mutual susceptance between node i and node j; G cij is the mutual conductance gain of the phase shifter between node i and node j; B cij is the mutual susceptance gain of the phase shifter between node i and node j; the node injection power under the configuration scheme with the controllable phase shifter is further calculated by using the following formula:

4. The method of claim 3, wherein, combined with the grid node power, voltage and the configuration quantity, configuration position, configuration capacity and adjustment phase of the controllable phase shifter in the configuration scheme, the Newton-Raphson method is used to classify the nodes according to the known information of each grid node, set the initial value of the voltage, calculate the power imbalance, solve the voltage correction amount by iteration until the power imbalance is less than a given minimum value, and then the voltage amplitude and phase of each grid node are obtained, and then the power flow distribution under different configuration schemes is obtained. The steps of obtaining the wind power consumption rate, line load rate for reflecting transmission capacity and load demand under each configuration scheme are as follows:

5. The method of claim 4, wherein, based on the active injection and reactive injection of each node obtained through the power flow calculation, the power of each line and the power of each load node in the grid are calculated, and combined with the maximum transmission power of the grid, the wind power consumption rate, line load rate and load demand are further obtained. where WSR is the wind power accommodation rate; P con is the actual accommodated wind power; P wind is the total wind power generation; P i is the power of the i-th line in the power grid, P out is the power transmitted by the power grid; P j is the power of the load node j in the power grid, P load is the total load of the power grid; k is the total number of lines in the power grid; s is the total number of load nodes in the power grid; The calculation method of the wind power consumption rate criterion in the evaluation system for controllable phase shifter configuration is as follows: where TC is the line load ratio, P out is the grid delivered power, P max is the grid maximum transmission power; The calculation method of the line load rate criterion is as follows: where LD is the load demand, P j is the power of the load node j in the power grid, P load is the total load of the power grid, and s is the total number of load nodes of the power grid.

6. The method of claim 5, wherein, The calculation method of the load demand criterion is as follows: The specific method of obtaining the scores of different configuration schemes by using the feature vector method and selecting the configuration scheme with the highest score as the final configuration scheme comprises the following steps: an analytic hierarchy process method is adopted to construct a judgment matrix A considering the correlation of each criterion: wherein a ij to represent the relative importance of criterion i with respect to criterion j, i e [1, 6], j e [1, 6]; Based on the judgment matrix, the weight of the criterion layer in the analytic hierarchy process is calculated by using the eigenvector method, the scores under different configuration schemes are determined, and the configuration scheme with the highest comprehensive score is selected.

7. The method of claim 6, wherein, The specific steps of the configuration scheme based on the judgment matrix, the weight of the criterion layer in the analytic hierarchy process is calculated by using the eigenvector method, the scores under different configuration schemes are determined, and the configuration scheme with the highest comprehensive score are as follows: According to the eigenvector method, the maximum eigenvalue and eigenvector of the judgment matrix are calculated: |A-λI|=0 Aω = λ max ω where λ is the eigenvalue; I is the identity matrix; ω is the eigenvector; λ max is the largest eigenvalue of matrix A; The eigenvector is normalized so that the sum of the weights is 1, and the elements of the normalized eigenvector are the weights: In the formula, |ω is the norm of the eigenvector; The comprehensive score of different configuration schemes under different criteria is calculated as follows: In the formula, α1, α2, α3, α4, α5 and α6 respectively correspond to the weight of wind power accommodation rate, investment cost, operation cost, transmission capacity, load demand and power supply location; S is the comprehensive score; Z is the total number of wind turbines connected to the system; W i is the power generation of the i th wind turbine; W imax is the maximum power generation of the i th wind turbine; M is the number of investment cost categories; C j is the investment cost of the j th category; T is the number of time periods; R tj is the operation and maintenance cost of the j th investment in the t th year; L is the number of transmission lines; TTC l is the transmission capacity of the l th line; D load is the demand of the load; D source is the location information of the power supply.

8. A controllable phase shifter configuration system in a power grid, the controllable phase shifter being installed in a power grid with an access to a new energy field station, characterized in that, The configuration scheme formation module, modeling module, power flow calculation module, evaluation system construction module and score acquisition module are included. The configuration scheme formation module is used to form a configuration scheme set of the controllable phase shifter, and the configuration scheme set includes a plurality of configuration schemes related to configuration quantity, configuration position, configuration capacity and adjustment phase. The modeling module is used to construct a steady-state mathematical model of controllable phase shifter access power flow considering the structural characteristics of controllable phase shifter. The power flow calculation module is used to perform power flow calculation under each configuration scheme in the configuration scheme set based on the steady-state mathematical model, to obtain the wind power consumption rate, line load rate for reflecting transmission capacity, and load demand under each configuration scheme. The evaluation system construction module is used to construct an evaluation system for controllable phase shifter configuration, and the evaluation system takes the comprehensive score of the configuration scheme related to wind power consumption rate, investment cost, operation cost, transmission capacity, load demand and power supply location as the target layer, and takes the wind power consumption rate criterion, investment cost criterion, operation cost criterion, transmission capacity criterion, load demand criterion and power supply location criterion as the criterion layer, and takes a plurality of configuration schemes as the scheme layer. The score acquisition module is used to obtain the score of different configuration schemes under the evaluation system by using the eigenvector method based on the calculated wind power consumption rate, line load rate and load demand under each configuration scheme, and select the configuration scheme with the highest score as the final configuration scheme.

9. An electronic device, comprising: The electronic device includes a memory and a processor, the memory stores a computer program, and the processor is used to call and run the computer program stored in the memory to execute the method of any one of claims 1 to 7.

10. A computer-readable storage medium storing a computer program, the computer program comprising instructions that, when executed by a computer, cause the computer to perform the method of any one of claims 1 to 9. The computer program is executed by the processor to implement the steps of the method of any one of claims 1 to 7.

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