A method, system, device, and medium for modeling a dynamic reactive compensation device

Abstract

The application discloses a kind of dynamic reactive compensation device's modeling method, system, equipment and medium, by constructing initial stable model, with the data corresponding to measured waveform, measured power data is calculated, using actual controller parameter adjusts the transient parameter of initial stable model, obtains intermediate stable model.In voltage crossing fault scene operation intermediate stable model, output fault power data, if fault power data and measured power data are not equal, then adjust transient parameter, obtain the target stable model corresponding to dynamic reactive compensation device.Solved the modeling mode of existing dynamic reactive compensation device is based on general theoretical model, not verified by actual operation data, cannot accurately simulate the actual operating characteristics of dynamic reactive compensation device, leading to the applicability of the generated dynamic reactive compensation device model is low technical problem.Can with the measured waveform and actual controller parameter corresponding to grid end, construct to obtain the applicability of target stable model is high.

Description

Technical Field

[0001] This invention relates to the field of dynamic reactive power compensation device modeling technology, and in particular to a modeling method, system, device and medium for dynamic reactive power compensation devices. Background Technology

[0002] As resource and environmental problems become increasingly prominent, renewable energy technologies have received continuous attention and research, promoting the rapid development of the new energy power generation industry. The new energy power generation industry mainly includes wind farms, photovoltaic power plants, and other new energy power plants. To ensure the safe and stable operation of new energy sources integrated into the power system, corresponding dynamic reactive power compensation devices need to be installed in these power plants.

[0003] Since the voltage ride-through capability of dynamic reactive power compensation devices is of great significance to the voltage and frequency stability of power systems, it is necessary to model the electromagnetic transient characteristics of dynamic reactive power compensation devices under voltage ride-through conditions.

[0004] Currently, the modeling method for dynamic reactive power compensation devices typically involves constructing an electromagnetic transient model based on the mathematical model, and then building the dynamic reactive power compensation device model based on the typical parameters of the electromagnetic transient model. This modeling method is based on a general theoretical model and has not been verified by actual operating data. It cannot accurately simulate the actual operating characteristics of the dynamic reactive power compensation device, resulting in low applicability of the generated dynamic reactive power compensation device model. Summary of the Invention

[0005] This invention provides a modeling method, system, device, and medium for dynamic reactive power compensation devices, solving the technical problem that existing modeling methods for dynamic reactive power compensation devices are based on general theoretical models, have not been verified by actual operating data, cannot accurately simulate the actual operating characteristics of dynamic reactive power compensation devices, and result in low applicability of the generated dynamic reactive power compensation device models.

[0006] The present invention provides a modeling method for a dynamic reactive power compensation device, comprising:

[0007] In response to the received initial power parameters, an initial stability model corresponding to the dynamic reactive power compensation device is constructed.

[0008] When the measured waveform and actual controller parameters corresponding to the power grid are received, the corresponding measured power data are calculated based on the power information extracted from the measured waveform.

[0009] The transient parameters corresponding to the initial stable model are adjusted using the actual controller parameters to obtain an intermediate stable model.

[0010] The intermediate stability model is run under a preset voltage ride-through fault scenario, and fault power data is output.

[0011] If the fault power data is not equal to the measured power data, the transient parameters are adjusted to obtain the target stability model corresponding to the dynamic reactive power compensation device.

[0012] Optionally, the step of constructing an initial stability model corresponding to the dynamic reactive power compensation device based on the received initial power parameters includes:

[0013] When the initial power parameters are received, a power flow model corresponding to the dynamic reactive power compensation device is constructed, and the initial state data is extracted. The initial state data includes the reactive power output by the power flow model and the additional power data.

[0014] According to the dynamic output characteristics of the power flow model under the preset high-power operating state, the reactive power is updated to obtain the first reactive power;

[0015] According to the dynamic output characteristics of the power flow model under the preset low-power operating state, the reactive power is updated to obtain the second reactive power;

[0016] Based on the first reactive power and the second reactive power, the additional power data are updated respectively, and an initial stable model corresponding to the dynamic reactive power compensation device is constructed.

[0017] Optionally, the step of calculating the corresponding measured power data based on the power information extracted from the measured waveform when the measured waveform and actual controller parameters corresponding to the power grid are received includes:

[0018] When the measured waveform and actual controller parameters corresponding to the grid are received, the high-voltage side three-phase instantaneous voltage and three-phase instantaneous current of the measured waveform are obtained;

[0019] The three-phase instantaneous voltage and three-phase instantaneous current on the high-voltage side are subjected to discrete Fourier transform to obtain the fundamental phase voltage and fundamental phase current.

[0020] The fundamental phase voltage and fundamental phase current are calculated using the PARK transform to obtain the positive sequence components of the fundamental phase voltage and the fundamental phase current.

[0021] The measured power data are obtained based on the positive sequence components of the fundamental phase voltage and the fundamental phase current.

[0022] Optionally, the measured power data includes a first positive sequence voltage, a first reactive current, and a first reactive power; the voltage ride-through fault scenario includes a voltage drop scenario and a voltage rise scenario; the step of running the intermediate stability model in the preset voltage ride-through fault scenario and outputting fault power data includes:

[0023] The intermediate stability model is run in the voltage drop scenario to obtain the first instantaneous voltage and the first instantaneous current corresponding to the voltage drop scenario;

[0024] The intermediate stability model is used to perform discrete Fourier transform and PARK transform on the first instantaneous voltage and the first instantaneous current to output the fault power data corresponding to the voltage drop scenario.

[0025] The intermediate stability model is run under the voltage rise scenario to obtain the second instantaneous voltage and the second instantaneous current corresponding to the voltage rise scenario;

[0026] The intermediate stability model is used to perform discrete Fourier transform and PARK transform on the second instantaneous voltage and the second instantaneous current to output the fault power data corresponding to the voltage rise scenario.

[0027] Optionally, the intermediate stability model includes a low-voltage ride-through fault module and a low-voltage ride-through module; when the voltage ride-through fault scenario is a voltage drop scenario, the fault power data includes a second positive sequence voltage, a second reactive current, and a second reactive power; the step of adjusting the transient parameters to obtain the target stability model corresponding to the dynamic reactive power compensation device if the fault power data is not equal to the measured power data includes:

[0028] If the second positive sequence voltage is not equal to the first positive sequence voltage, the initial fault resistance per unit value corresponding to the low voltage ride-through fault module is adjusted to the intermediate fault resistance per unit value according to the preset first adjustment gradient.

[0029] Jump to execute the step of adjusting the transient parameters corresponding to the initial stable model using the actual controller parameters to obtain the intermediate stable model, until the second positive sequence voltage is equal to the first positive sequence voltage, and determine the intermediate stable model at the current moment as the target stable model;

[0030] If the second reactive current is not equal to the first reactive current, then the first reactive control mode, the first adjustment coefficient or the first specified value of the low voltage ride-through module will be adjusted to the intermediate reactive control mode, the intermediate adjustment coefficient or the intermediate specified value according to the preset second adjustment gradient.

[0031] The process jumps to the step of adjusting the transient parameters corresponding to the initial stable model using the actual controller parameters to obtain the intermediate stable model, until the second reactive current is equal to the first reactive current, and the intermediate stable model at the current moment is determined as the target stable model.

[0032] Optionally, the intermediate stability model includes a high-voltage ride-through fault module and a high-voltage ride-through module; when the voltage ride-through fault scenario is a voltage rise scenario, the fault power data includes a third positive sequence voltage, a third reactive current, and a third reactive power; the step of adjusting the transient parameters to obtain the target stability model corresponding to the dynamic reactive power compensation device if the fault power data is not equal to the measured power data includes:

[0033] If the third positive sequence voltage is not equal to the first positive sequence voltage, the initial constant impedance load reactive power change value corresponding to the high voltage ride-through fault module is adjusted to the intermediate constant impedance load reactive power change value according to the preset third adjustment gradient.

[0034] Jump to execute the step of adjusting the transient parameters corresponding to the initial stable model using the actual controller parameters to obtain the intermediate stable model, until the third positive sequence voltage is equal to the first positive sequence voltage, and determine the intermediate stable model at the current moment as the target stable model;

[0035] If the third reactive current is not equal to the first reactive current, then the second reactive control mode, the second adjustment coefficient or the second specified value of the high voltage ride-through module will be adjusted to the intermediate reactive control mode, the intermediate adjustment coefficient or the intermediate specified value according to the preset fourth adjustment gradient.

[0036] The process jumps to the step of adjusting the transient parameters corresponding to the initial stable model using the actual controller parameters to obtain the intermediate stable model, until the third reactive current is equal to the first reactive current, and the intermediate stable model at the current moment is determined as the target stable model.

[0037] Optionally, the method further includes:

[0038] If the fault power data is equal to the measured power data, then the intermediate stable model at the current moment is determined as the target stable model.

[0039] The present invention also provides a modeling system for a dynamic reactive power compensation device, comprising:

[0040] The initial stability model construction module is used to construct the initial stability model corresponding to the dynamic reactive power compensation device in response to the received initial power parameters.

[0041] The measured power data calculation module is used to calculate the corresponding measured power data based on the power information extracted from the measured waveform when the measured waveform and actual controller parameters corresponding to the power grid are received.

[0042] The intermediate stability model acquisition module is used to adjust the transient parameters corresponding to the initial stability model using the actual controller parameters to obtain the intermediate stability model.

[0043] The fault power data output module is used to run the intermediate stability model in a preset voltage ride-through fault scenario and output fault power data.

[0044] The first target stability model acquisition module is used to adjust the transient parameters and obtain the target stability model corresponding to the dynamic reactive power compensation device if the fault power data is not equal to the measured power data.

[0045] The present invention also provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor performs the steps of implementing the modeling method of any of the above-described dynamic reactive power compensation devices.

[0046] The present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed, implements the modeling method for any of the above-described dynamic reactive power compensation devices.

[0047] As can be seen from the above technical solutions, the present invention has the following advantages:

[0048] This invention constructs an initial stability model for a dynamic reactive power compensation device based on received initial power parameters. Upon receiving measured waveforms and actual controller parameters from the grid, it calculates the corresponding measured power data using power information extracted from the measured waveforms. The transient parameters corresponding to the initial stability model are then adjusted using the actual controller parameters to obtain an intermediate stability model. The intermediate stability model is then run under a preset voltage ride-through fault scenario, outputting fault power data. This fault power data is compared with the measured power data. If they are not equal, the transient parameters are adjusted until they are equal, at which point the intermediate stability model at the current moment is determined as the target stability model. This invention solves the technical problem of existing dynamic reactive power compensation device modeling methods being based on general theoretical models without verification from actual operating data, thus failing to accurately simulate the actual operating characteristics of the dynamic reactive power compensation device and resulting in low applicability of the generated model. It enables the construction of a highly applicable target stability model using measured waveforms and actual controller parameters from the grid. Attached Figure Description

[0049] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1 A flowchart illustrating the steps of a modeling method for a dynamic reactive power compensation device provided in Embodiment 1 of the present invention;

[0051] Figure 2 This is a flowchart illustrating the steps of a modeling method for a dynamic reactive power compensation device according to Embodiment 2 of the present invention.

[0052] Figure 3 The flowchart illustrates the execution process of a modeling method for a dynamic reactive power compensation device provided in Embodiment 2 of the present invention.

[0053] Figure 4 This is a structural block diagram of a modeling system for a dynamic reactive power compensation device provided in Embodiment 3 of the present invention. Detailed Implementation

[0054] This invention provides a modeling method, system, device, and medium for dynamic reactive power compensation devices, addressing the technical problem that existing modeling methods for dynamic reactive power compensation devices are based on general theoretical models, have not been verified by actual operating data, and cannot accurately simulate the actual operating characteristics of dynamic reactive power compensation devices, resulting in low applicability of the generated dynamic reactive power compensation device models.

[0055] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0056] Please see Figure 1 , Figure 1 A flowchart illustrating the steps of a modeling method for a dynamic reactive power compensation device provided in an embodiment of the present invention.

[0057] The present invention provides a modeling method for a dynamic reactive power compensation device, comprising:

[0058] Step 101: Response to the received initial power parameters, construct the initial stability model corresponding to the dynamic reactive power compensation device.

[0059] Initial power parameters refer to data such as network topology, component parameters, and load parameters at the grid end. Dynamic Var Compensator (SVG) is a reactive power compensation device installed at the grid end to compensate for frequently fluctuating reactive power, suppress flicker and harmonics, improve the power factor, and enhance the power quality and efficiency of the grid.

[0060] The initial stability model refers to the initial model established using electromechanical transient simulation software to calculate the transient process output characteristics of the dynamic reactive power compensation device.

[0061] In this embodiment of the invention, upon receiving the initial input power parameters, a power flow model corresponding to the dynamic reactive power compensation device is constructed, and the reactive power and additional power data output by the power flow model are extracted. The reactive power is updated according to the dynamic output characteristics of the power flow model under high-power and low-power operating states, respectively, to obtain a first reactive power and a second reactive power. The additional power data is then updated using the first and second reactive power. An initial stability model corresponding to the dynamic reactive power compensation device is constructed using the first reactive power, the second reactive power, and the updated additional power data.

[0062] Step 102: When the measured waveform and actual controller parameters corresponding to the power grid are received, calculate the corresponding measured power data based on the power information extracted from the measured waveform.

[0063] Measured waveforms refer to waveforms actually detected at the power grid site or waveforms simulated using hardware-in-the-loop simulation systems with corresponding data from the power grid. Actual controller parameters refer to the parameter information of the controller used by the dynamic reactive power compensation device installed at the power grid.

[0064] Power information refers to the instantaneous three-phase voltage and current on the high-voltage side, where high voltage typically refers to 35kV. Measured power data refers to the first positive sequence voltage, first reactive current, and first reactive power obtained by performing Discrete Fourier Transform and PARK Transform on the instantaneous three-phase voltage and current on the high-voltage side.

[0065] In this embodiment of the invention, when the measured waveform corresponding to the power grid and the actual controller parameters corresponding to the dynamic reactive power compensation device are received, the high-voltage side three-phase instantaneous voltage and three-phase instantaneous current in the measured waveform are obtained, and discrete Fourier transform and PARK transform are performed on them to obtain the first positive sequence voltage, the first reactive current and the first reactive power corresponding to the measured waveform.

[0066] Step 103: Adjust the transient parameters corresponding to the initial stable model using the actual controller parameters to obtain the intermediate stable model.

[0067] An intermediate stable model is an intermediate model obtained by adjusting the transient parameters in the initial model according to the actual controller parameters, based on the initial stable model.

[0068] In this embodiment of the invention, when the actual controller parameters corresponding to the dynamic reactive power compensation device set at the power grid are received, the transient parameters of each module in the initial stability model are adjusted according to the actual controller parameters to obtain the intermediate stability model.

[0069] Step 104: Run the intermediate stability model in the preset voltage ride-through fault scenario and output the fault power data.

[0070] Voltage ride-through fault scenarios include voltage drop scenarios caused by low voltage ride-through faults and voltage rise scenarios caused by high voltage ride-through faults.

[0071] Fault power data refers to the second positive sequence voltage, second reactive current, and second reactive power output by the intermediate stability model when operating in a voltage drop scenario; and the third positive sequence voltage, third reactive current, and third reactive power output by the intermediate stability model when operating in a voltage rise scenario.

[0072] In this embodiment of the invention, voltage dip scenarios and voltage rise scenarios are set by combining initial power parameters and the actual controller parameters corresponding to the grid. In the voltage dip scenario, an intermediate stability model is run, outputting a second positive-sequence voltage, a second reactive current, and a second reactive power; in the voltage rise scenario, the intermediate stability model is run, outputting a third positive-sequence voltage, a third reactive current, and a third reactive power.

[0073] Step 105: If the fault power data is not equal to the measured power data, adjust the transient parameters to obtain the target stability model corresponding to the dynamic reactive power compensation device.

[0074] The target stability model refers to a model that enables dynamic reactive power compensation devices to adjust the corresponding parameters at the grid end in a timely manner when a preset voltage ride-through fault scenario occurs at the grid end, so as to ensure that the power system at the grid end maintains voltage and frequency stability.

[0075] In this embodiment of the invention, an intermediate stable model is run in a voltage dip scenario. The output fault power data is compared with the measured power data. If the fault power data and the measured power data are not equal, the transient parameters of the intermediate steady-state model are adjusted until the fault power data and the measured power data are equal. The intermediate stable model at the current moment is then determined as the target stable model. Similarly, the intermediate stable model is run in a voltage rise scenario. The output fault power data is compared with the measured power data. If the fault power data and the measured power data are not equal, the transient parameters of the intermediate steady-state model are adjusted until the fault power data and the measured power data are equal. The intermediate stable model at the current moment is then determined as the target stable model. This target stable model is set on the dynamic reactive power compensation device. When a low-voltage ride-through fault or a high-voltage ride-through fault occurs at the grid end, i.e., a voltage dip scenario or a voltage rise scenario occurs, the target stable model can provide corresponding transient parameters. This allows the dynamic reactive power compensation device to adjust relevant data in a timely manner, ensuring that the power system at the grid end maintains voltage and frequency stability.

[0076] In this embodiment of the invention, an initial stability model corresponding to the dynamic reactive power compensation device is constructed by responding to the received initial power parameters. When the measured waveform and actual controller parameters corresponding to the grid are received, the corresponding measured power data is calculated according to the power information extracted from the measured waveform, and the transient parameters corresponding to the initial stability model are adjusted using the actual controller parameters to obtain an intermediate stability model. Then, the intermediate stability model is run in a preset voltage ride-through fault scenario, outputting fault power data, and comparing the fault power data with the measured power data. If the fault power data and the measured power data are not equal, the transient parameters are adjusted until the fault power data and the measured power data are equal, and the intermediate stability model at the current moment is determined as the target stability model. This solves the technical problem that the existing modeling method of dynamic reactive power compensation devices is based on a general theoretical model, which has not been verified by actual operating data, and cannot accurately simulate the actual operating characteristics of the dynamic reactive power compensation device, resulting in low applicability of the generated dynamic reactive power compensation device model. It can construct a highly applicable target stability model using the measured waveform and actual controller parameters corresponding to the grid.

[0077] Please see Figure 2 , Figure 2 The flowchart illustrates the steps of a modeling method for a dynamic reactive power compensation device provided in Embodiment 2 of the present invention.

[0078] Step 201: Response to the received initial power parameters, construct the initial stability model corresponding to the dynamic reactive power compensation device.

[0079] Optionally, step 201 may include the following sub-steps S11-S14:

[0080] S11. When the initial power parameters are received, construct the power flow model corresponding to the dynamic reactive power compensation device and extract the initial state data, which includes the reactive power output by the power flow model and the additional power data.

[0081] Additional power data includes active power as well as voltage and power at various nodes on the grid side.

[0082] It should be noted that the power flow model of the dynamic reactive power compensation device and the infinite bus system was constructed using electromechanical transient simulation software, and the electromechanical transient simulation software selected was BPA software developed by the China Electric Power Research Institute.

[0083] In this embodiment of the invention, when the network topology, component parameters and load parameters corresponding to the power grid are received, the BPA software is used to construct a power flow model of the dynamic reactive power compensation device and the infinite system. The power flow model performs power flow calculation based on the network topology, component parameters and load parameters corresponding to the power grid to obtain the reactive current, reactive power and voltage and power of each node at the power grid corresponding to the initial state of the reactive power compensation device set at the power grid.

[0084] S12. Update the reactive power according to the dynamic output characteristics of the power flow model under the preset high-power operating state to obtain the first reactive power.

[0085] It should be noted that since dynamic reactive power compensation devices typically operate at either high or low power, the parameter changes during modeling need to be considered when the device is in either of these two operating states. The power range for the dynamic reactive power compensation device in high-power operation is 0.9Qn≦Q≦Qn. The power range for the dynamic reactive power compensation device in low-power operation is 0.1Qn≦Q≦0.3Qn.

[0086] In this embodiment of the invention, using initial power parameters, a power value corresponding to a high-power operating state is selected from 0.9Qn≦Q≦Qn. The power flow model is then configured to operate in the high-power operating state corresponding to this power value for power flow calculation, and the reactive power is updated to the first reactive power.

[0087] S13. Update the reactive power according to the dynamic output characteristics of the power flow model under the preset low-power operating state to obtain the second reactive power.

[0088] In this embodiment of the invention, using initial power parameters, a power value corresponding to a low-power operating state is selected from 0.1Qn≦Q≦0.3Qn. The power flow model is then set to the low-power operating state corresponding to this power value for power flow calculation, and the reactive power is updated to a second reactive power.

[0089] S14. Update the additional power data according to the first reactive power and the second reactive power respectively, and construct the initial stability model corresponding to the dynamic reactive power compensation device.

[0090] In this embodiment, the power flow model updates the first reactive power and the second reactive power under high-power and low-power operating conditions, respectively, and then updates the corresponding active power and the voltage and power of each node in the grid according to the first and second reactive power. An initial stability model corresponding to the high-power and low-power operating conditions of the dynamic reactive power compensation device is constructed.

[0091] Step 202: When the measured waveform and actual controller parameters corresponding to the grid are received, obtain the high-voltage side three-phase instantaneous voltage and three-phase instantaneous current of the measured waveform.

[0092] In this embodiment of the invention, when the measured waveform and actual controller parameters corresponding to the grid end are received, the 35kV side three-phase instantaneous voltage and three-phase instantaneous current of the measured waveform are obtained.

[0093] Step 203: Perform discrete Fourier transform on the three-phase instantaneous voltage and three-phase instantaneous current on the high-voltage side to obtain the fundamental phase voltage and fundamental phase current.

[0094] The fundamental phase voltage includes a real part and an imaginary part, and the fundamental phase current also includes a real part and an imaginary part.

[0095] In this embodiment of the invention, the 35kV side three-phase instantaneous voltage v a v b v c and three-phase instantaneous current i a i b i c Perform a Discrete Fourier Transform, that is, perform a three-phase instantaneous voltage v a v b v c Substituting into formulas (1) and (2) respectively, the real part VA of the fundamental phase voltage is calculated. sin VB sin VC sin And the imaginary part VA cos VB cos VC cos The three-phase instantaneous current i a i b i c Substituting into formulas (3) and (4) respectively, the real part IA of the fundamental phase current is calculated. sin IB sin IC sin And the imaginary part IA cos IB cos ICcos .

[0096]

[0097]

[0098]

[0099]

[0100] Step 204: Use PARK transform to calculate the fundamental phase voltage and fundamental phase current respectively, and obtain the positive sequence components of the fundamental phase voltage and the fundamental phase current.

[0101] The positive-sequence component of the fundamental phase voltage includes a real part and an imaginary part; the positive-sequence component of the fundamental phase current also includes a real part and an imaginary part.

[0102] In this embodiment of the invention, the real part VA of the fundamental phase voltage is... sin VB sin VC sin And the imaginary part VA cos VB cos VC cos Substituting into equations (5) and (6) respectively, we perform the PARK transformation to obtain the real part V1 of the positive sequence component of the fundamental phase voltage. sin And the imaginary part V1 cos :

[0103]

[0104]

[0105] The real part IA of the fundamental phase current sin IB sin IC sin And the imaginary part IA cos IB cos IC cos Substituting into equations (7) and (8) respectively, we perform the PARK transformation to obtain the real part I1 of the positive sequence component of the fundamental phase current. sin And the imaginary part I1 cos :

[0106]

[0107]

[0108] Step 205: Obtain the measured power data based on the positive sequence components of the fundamental phase voltage and the fundamental phase current.

[0109] The measured power data includes the first positive sequence voltage, the first reactive current, and the first reactive power.

[0110] In this embodiment of the invention, the formula for the first positive sequence voltage is:

[0111]

[0112] The real part V1 of the positive sequence component of the fundamental phase voltage sin And the imaginary part V1 cos Substituting into the formula for the first positive sequence voltage, the first positive sequence voltage V1 is calculated.

[0113] The formula for the first reactive power is:

[0114] Q1 = 1.5(V1) cos ·I1 cos -V1 sin ·I1 sin )

[0115] The real part V1 of the positive sequence component of the fundamental phase voltage sin And the imaginary part V1 cos and the real part I1 of the positive sequence component of the fundamental phase current sin And the imaginary part I1 cos Substituting into the formula for the first reactive power, the first reactive power Q1 is calculated.

[0116] The first reactive current formula is:

[0117]

[0118] The first reactive power Q1 and the real part V1 of the positive sequence component of the fundamental phase voltage are... sin And the imaginary part V1 cos Substituting into the formula for the first reactive current, the first reactive current I is calculated. q1 .

[0119] Step 206: Adjust the transient parameters corresponding to the initial stable model using the actual controller parameters to obtain the intermediate stable model.

[0120] The initial stability model includes a main control module, an auxiliary control module, a device constant reactive power module, a low voltage ride-through module, a high voltage ride-through module, a low voltage ride-through fault module, a high voltage ride-through fault module, and an output module.

[0121] In this embodiment of the invention, the parameter settings in the main control module are the same as the actual controller parameters corresponding to the dynamic reactive power compensation device. The voltage limits VMAX and VMIN, and the maximum reactive currents ICMAX and ILMAX of the auxiliary control module are set. The parameter settings in the device's reactive power compensation module are the same as those in the main control module.

[0122] Using actual controller parameters, set the reactive power control mode of the low-voltage ride-through module in the voltage drop scenario, and the key settings corresponding to entering and exiting the low-voltage ride-through fault; using actual controller parameters, set the reactive power control mode of the high-voltage ride-through module in the voltage rise scenario, and the key settings corresponding to entering and exiting the high-voltage ride-through fault, where the key settings include adjustment coefficients and specified values.

[0123] The output module is configured to output all variables, including the second positive sequence voltage, second reactive current, second reactive power, third positive sequence voltage, third reactive current, and third reactive power. Based on the fault information corresponding to the measured waveform in a voltage dip scenario, the fault location, fault time, and per-unit value of the fault resistance for the low-voltage ride-through fault module are set. Based on the fault information corresponding to the measured waveform in a voltage rise scenario, the fault location, fault time, and reactive power change value of the constant impedance load for the high-voltage ride-through fault module are set. The fault locations of both the low-voltage ride-through and high-voltage ride-through fault modules are set on the 35kV side of the grid connection point of the dynamic reactive power compensation device.

[0124] Step 207: Run the intermediate stability model in the preset voltage ride-through fault scenario and output the fault power data.

[0125] The measured power data includes the first positive sequence voltage, the first reactive current, and the first reactive power. The voltage ride-through fault scenarios include voltage drop scenarios and voltage rise scenarios.

[0126] Optionally, step 207 may include the following sub-steps S21-S24:

[0127] S21. Run the intermediate stable model in the voltage drop scenario to obtain the first instantaneous voltage and the first instantaneous current corresponding to the voltage drop scenario.

[0128] Voltage drop data for voltage drop scenarios include 0.2pu, 0.5pu, 0.7pu, and 0.85pu.

[0129] In this embodiment of the invention, the intermediate stability model is run on the voltage drop scenarios corresponding to each data point in the voltage drop data to obtain the first instantaneous voltage and the first instantaneous current corresponding to each voltage drop scenario.

[0130] S22. Perform Discrete Fourier Transform and PARK Transform on the first instantaneous voltage and the first instantaneous current using the intermediate stability model, and output the fault power data corresponding to the voltage drop scenario.

[0131] In this embodiment of the invention, the first instantaneous voltage corresponding to each voltage drop scenario is substituted into the above formulas (1) and (2) respectively to calculate the real and imaginary parts of the corresponding fundamental phase voltage. Then, the real and imaginary parts of the obtained fundamental phase voltage are substituted into the above formulas (5) and (6) respectively to perform PARK transformation to obtain the real and imaginary parts of the positive sequence component of the fundamental phase voltage corresponding to the voltage drop scenario.

[0132] Substitute the first instantaneous current corresponding to each voltage drop scenario into the above formulas (3) and (4) respectively to calculate the real and imaginary parts of the corresponding fundamental phase current. Then, substitute the obtained real and imaginary parts of the fundamental phase current into the above formulas (7) and (8) respectively to perform PARK transformation to obtain the real and imaginary parts of the positive sequence component of the fundamental phase current corresponding to the voltage drop scenario.

[0133] The calculation formulas for the second positive sequence voltage, the second reactive current, and the second reactive power are the same as those for the first positive sequence voltage, the first reactive current, and the first reactive power.

[0134] Substitute the real and imaginary parts of the positive-sequence component of the fundamental phase voltage corresponding to each voltage drop scenario into the first positive-sequence voltage formula to calculate the second positive-sequence voltage corresponding to the voltage drop scenario.

[0135] Substitute the real and imaginary parts of the positive sequence component of the fundamental phase voltage and the real and imaginary parts of the positive sequence component of the fundamental phase current corresponding to each voltage drop scenario into the first reactive power formula to calculate the corresponding second reactive power.

[0136] Substitute the second reactive power corresponding to each voltage drop scenario and the real and imaginary parts of the fundamental phase voltage into the first reactive current formula to calculate the second reactive current corresponding to the voltage drop scenario.

[0137] S23. Run the intermediate stable model in the voltage rise scenario to obtain the second instantaneous voltage and the second instantaneous current corresponding to the voltage rise scenario.

[0138] The voltage rise data for the voltage rise scenario includes 1.25pu and 1.3pu.

[0139] In this embodiment of the invention, the intermediate stable model is run in the voltage rise scenario corresponding to each data point within the voltage rise data to obtain the second instantaneous voltage and the second instantaneous current corresponding to each voltage rise scenario.

[0140] S24. Perform Discrete Fourier Transform and PARK Transform on the second instantaneous voltage and the second instantaneous current using the intermediate stability model, and output the fault power data corresponding to the voltage rise scenario.

[0141] In this embodiment of the invention, the second instantaneous voltage corresponding to each voltage rise scenario is substituted into the above formulas (1) and (2) respectively to calculate the real and imaginary parts of the corresponding fundamental phase voltage. Then, the real and imaginary parts of the obtained fundamental phase voltage are substituted into the above formulas (5) and (6) respectively to perform PARK transformation to obtain the real and imaginary parts of the corresponding positive sequence component of the fundamental phase voltage.

[0142] Substitute the second instantaneous current corresponding to each voltage rise scenario into the above formulas (3) and (4) respectively to calculate the real and imaginary parts of the corresponding fundamental phase current. Then substitute the obtained real and imaginary parts of the fundamental phase current into the above formulas (7) and (8) respectively to perform PARK transformation to obtain the real and imaginary parts of the corresponding positive sequence component of the fundamental phase current.

[0143] The calculation formulas for the third positive sequence voltage, the third reactive current, and the third reactive power are the same as those for the first positive sequence voltage, the first reactive current, and the first reactive power.

[0144] Substitute the real and imaginary parts of the positive-sequence component of the fundamental phase voltage corresponding to each voltage increase scenario into the first positive-sequence voltage formula to calculate the corresponding third positive-sequence voltage.

[0145] Substitute the real and imaginary parts of the positive sequence component of the fundamental phase voltage and the real and imaginary parts of the positive sequence component of the fundamental phase current corresponding to each voltage rise scenario into the first reactive power formula to calculate the corresponding third reactive power.

[0146] Substitute the third reactive power corresponding to each voltage rise scenario and the real and imaginary parts of the fundamental phase voltage into the first reactive current formula to calculate the corresponding third reactive current.

[0147] Step 208: If the fault power data is not equal to the measured power data, adjust the transient parameters to obtain the target stability model corresponding to the dynamic reactive power compensation device.

[0148] Optionally, step 208 may include the following sub-steps S31-S32:

[0149] S31. When the voltage ride-through fault scenario is a voltage drop scenario, the fault power data includes the second positive sequence voltage, the second reactive current, and the second reactive power. If the fault power data is not equal to the measured power data, the transient parameters are adjusted to obtain the target stability model corresponding to the dynamic reactive power compensation device.

[0150] Furthermore, the intermediate stability model includes a low-voltage ride-through fault module and a low-voltage ride-through module, and step S31 may include the following sub-steps S311-S314:

[0151] S311. If the second positive sequence voltage is not equal to the first positive sequence voltage, the initial fault resistance per unit value corresponding to the low voltage ride-through fault module is adjusted to the intermediate fault resistance per unit value according to the preset first adjustment gradient.

[0152] The preset first adjustment gradient refers to setting the value corresponding to the change in the per-unit value of the fault resistance for each adjustment, based on the measured waveform and actual controller parameters at the grid end, combined with the voltage drop scenario.

[0153] It should be noted that the adjustment gradient of the per-unit value of the fault resistance varies depending on the voltage ride-through fault scenario and the different types of measured waveforms and actual controller parameters. Those skilled in the art can set the corresponding adjustment gradient according to the different voltage ride-through fault scenarios and the different types of measured waveforms and actual controller parameters. This embodiment of the invention does not limit this.

[0154] In this embodiment of the invention, when the intermediate stability model is run in a voltage drop scenario, the output second positive sequence voltage is compared with the first positive sequence voltage calculated from the power information extracted from the measured waveform. When the second positive sequence voltage is not equal to the first positive sequence voltage, the initial fault resistance per unit value corresponding to the low voltage ride-through fault module in the intermediate stability model is adjusted according to the preset first adjustment gradient, thereby obtaining the intermediate fault resistance per unit value.

[0155] S312, Jump to execute the step of adjusting the transient parameters corresponding to the initial stable model using the actual controller parameters to obtain the intermediate stable model, until the second positive sequence voltage is equal to the first positive sequence voltage, and determine the intermediate stable model at the current moment as the target stable model.

[0156] In this embodiment of the invention, since the second positive-sequence voltage is not equal to the first positive-sequence voltage, the initial fault resistance per-unit value is adjusted to the intermediate fault resistance per-unit value, and the transient parameters corresponding to the initial stable model are adjusted according to the actual controller parameters to obtain the adjusted intermediate stable model. The adjusted intermediate stable model is run again in the voltage drop scenario, and the corresponding second positive-sequence voltage is output. This is compared with the first positive-sequence voltage. If the second positive-sequence voltage is still not equal to the first positive-sequence voltage, the above steps are repeated until the second positive-sequence voltage is equal to the first positive-sequence voltage. The second positive-sequence voltage at the current moment is determined as the target positive-sequence voltage corresponding to the target stable model.

[0157] S313. If the second reactive current is not equal to the first reactive current, the first reactive control mode, the first adjustment coefficient, or the first specified value of the low voltage ride-through module shall be adjusted to the intermediate reactive control mode, the intermediate adjustment coefficient, or the intermediate specified value according to the preset second adjustment gradient.

[0158] The second adjustment gradient refers to setting the adjustment method corresponding to each adjustment of the first reactive power control method, the first adjustment coefficient, or the first specified value, based on the type of reactive power control mode, the range of the first adjustment coefficient, and the first specified value.

[0159] The first adjustment factor refers to the low voltage ride-through factor, which is in the range of 1.0 to 2.0. Usually, the low voltage ride-through factor is selected as 1.5.

[0160] The first specified value refers to the low voltage ride-through voltage adjustment reference voltage and the rated current of the dynamic reactive power compensation device. The value range of the low voltage ride-through voltage adjustment reference voltage is 0.85pu to 0.9pu, and it is usually taken as 0.9pu.

[0161] The first reactive power control method includes a first constant reactive current control method and a second constant reactive current control method. The expression corresponding to the first constant reactive current control method is I. q =I q0 +k1×(V Lmax -V svg )×I N The expression corresponding to the second constant reactive current control mode is I. q =k1×(V Lmax -V svg )×I N , where I q0 The current before the fault in the dynamic reactive power compensation device is given; k1 is the low voltage ride-through factor, V Lmax Adjust the reference voltage for low voltage ride-through voltage, V svg The positive sequence voltage of the target bus is controlled by the dynamic reactive power compensation device; I N This is the rated current of the dynamic reactive power compensation device.

[0162] In this embodiment of the invention, when the second reactive current is not equal to the first reactive current, the first reactive current control mode selected by the low-voltage ride-through module is first determined to be either the first constant reactive current control mode or the second constant reactive current control mode according to the actual controller parameters, and the expression corresponding to the first reactive current control mode is determined. Based on the power information extracted from the measured waveform, the positive sequence voltage V of the target bus controlled by the dynamic reactive power compensation device is determined. svg If the expression corresponding to the first reactive power control mode is the first constant reactive current control mode, then the current I before the dynamic reactive power compensation device fault can be determined based on the current before the dynamic reactive power compensation device fault. q0 The reference voltage V is adjusted based on the actual controller parameters, combined with the low-voltage ride-through factor k1 and the low-voltage ride-through voltage. Lmax The range of values ​​for V is adjusted accordingly. Lmax I NOr k1, thus obtaining the intermediate reactive power control mode, intermediate adjustment coefficient, or intermediate specified value. Similarly, if the expression corresponding to the first reactive power control mode is the second fixed reactive current control mode, V also needs to be adjusted. Lmax I N Or k1, the method is the same as above.

[0163] S314. Jump to execute the step of adjusting the transient parameters corresponding to the initial stable model using the actual controller parameters to obtain the intermediate stable model, until the second reactive current is equal to the first reactive current, and determine the intermediate stable model at the current moment as the target stable model.

[0164] In this embodiment of the invention, the intermediate reactive power control mode, intermediate adjustment coefficient, or intermediate specified value obtained by adjustment are used to adjust the first reactive power control mode, first adjustment coefficient, or first specified value in the initial stable model. Other transient parameters of the initial stable model are adjusted in conjunction with the actual controller parameters to obtain the adjusted intermediate stable model. The intermediate stable model is then run again in a voltage drop scenario to obtain the first instantaneous voltage and first instantaneous current corresponding to the voltage drop scenario. Discrete Fourier transform and PARK transform are performed on the first instantaneous voltage and first instantaneous current. Combined with the first positive sequence voltage formula, the first reactive power formula, and the first reactive current formula, the adjusted second reactive current is calculated. The second reactive current is compared with the first reactive current. If the second reactive current is not equal to the first reactive current, the first reactive power control mode, first adjustment coefficient, or first specified value of the low-voltage ride-through module is adjusted according to the preset second adjustment gradient. The above steps are repeated until the second reactive current is equal to the first reactive current. The second reactive current at the current moment is then determined as the target reactive current corresponding to the target stable model.

[0165] S32. When the voltage ride-through fault scenario is a voltage rise scenario, the fault power data includes the third positive sequence voltage, the third reactive current, and the third reactive power. If the fault power data is not equal to the measured power data, the transient parameters are adjusted to obtain the target stability model corresponding to the dynamic reactive power compensation device.

[0166] Furthermore, the intermediate stability model includes a high-voltage ride-through fault module and a high-voltage ride-through module, and step S32 may include the following sub-steps S321-S324:

[0167] S321. If the third positive sequence voltage is not equal to the first positive sequence voltage, then the initial constant impedance load reactive power change value corresponding to the high voltage ride-through fault module is adjusted to the intermediate constant impedance load reactive power change value according to the preset third adjustment gradient.

[0168] The preset third adjustment gradient refers to setting the value corresponding to the change in reactive power of constant impedance load for each time, based on the measured waveform and actual controller parameters at the grid end, combined with the voltage rise scenario.

[0169] It should be noted that the adjustment gradient for the reactive power change value of constant impedance load varies depending on different voltage ride-through fault scenarios and different types of measured waveforms and actual controller parameters. Those skilled in the art can set corresponding adjustment gradients according to different voltage ride-through fault scenarios and different types of measured waveforms and actual controller parameters. This embodiment of the invention does not limit this.

[0170] In this embodiment of the invention, when the intermediate stability model is run in a voltage rise scenario, the output third positive sequence voltage is compared with the first positive sequence voltage calculated from the power information extracted from the measured waveform. When the third positive sequence voltage is not equal to the first positive sequence voltage, the initial constant impedance load reactive power change value corresponding to the high voltage ride-through fault module in the intermediate stability model is adjusted according to the preset third adjustment gradient, thereby obtaining the intermediate constant impedance load reactive power change value.

[0171] S322, Jump to execute the step of adjusting the transient parameters corresponding to the initial stable model using the actual controller parameters to obtain the intermediate stable model, until the third positive sequence voltage is equal to the first positive sequence voltage, and determine the intermediate stable model at the current moment as the target stable model.

[0172] In this embodiment of the invention, since the third positive-sequence voltage is not equal to the first positive-sequence voltage, the initial constant impedance load reactive power change value is adjusted to the intermediate constant impedance load reactive power change value, and the transient parameters corresponding to the initial stable model are adjusted according to the actual controller parameters to obtain the adjusted intermediate stable model. The adjusted intermediate stable model is run again in the voltage rise scenario, and the corresponding third positive-sequence voltage is output. This is compared with the first positive-sequence voltage. If the third positive-sequence voltage is still not equal to the first positive-sequence voltage, the above steps are repeated until the third positive-sequence voltage is equal to the first positive-sequence voltage. The third positive-sequence voltage at the current moment is determined as the target positive-sequence voltage corresponding to the target stable model.

[0173] S323. If the third reactive current is not equal to the first reactive current, the second reactive control mode, the second adjustment coefficient, or the second specified value of the high voltage ride-through module shall be adjusted to the intermediate reactive control mode, the intermediate adjustment coefficient, or the intermediate specified value according to the preset fourth adjustment gradient.

[0174] The fourth adjustment gradient refers to setting the adjustment method corresponding to each adjustment of the second reactive power control method, the second adjustment coefficient, or the second specified value, based on the type of reactive power control mode, the range of values ​​for the second adjustment coefficient and the second specified value.

[0175] The second adjustment factor refers to the high voltage ride-through factor, which ranges from 3.0 to 5.0. Usually, the high voltage ride-through factor is selected as 3.

[0176] The second specified value refers to the high voltage ride-through voltage adjustment reference voltage and the rated current of the dynamic reactive power compensation device. The high voltage ride-through voltage adjustment reference voltage ranges from 1.1pu to 1.15pu, and is usually taken as 1.1pu.

[0177] The second reactive power control method includes the third constant reactive current control method and the fourth constant reactive current control method. The expression corresponding to the third constant reactive current control method is I. q =I q0 +h2×(V Hmin -V svg )×I N The expression corresponding to the fourth reactive current control method is I. q =k2×(V Hmin -V svg )×I N , where I q0 The current before the fault in the dynamic reactive power compensation device is given by k; k2 is the high voltage ride-through factor, V Hmin The reference voltage for adjusting the high voltage ride-through voltage, V svg The positive sequence voltage of the target bus is controlled by the dynamic reactive power compensation device; I N This is the rated current of the dynamic reactive power compensation device.

[0178] In this embodiment of the invention, when the third reactive current is not equal to the first reactive current, the second reactive current control mode selected by the high-voltage ride-through module is first determined according to the actual controller parameters to be either the third constant reactive current control mode or the fourth constant reactive current control mode, thus obtaining the expression corresponding to the second reactive current control mode. Based on the power information extracted from the measured waveform, the positive sequence voltage V of the target bus controlled by the dynamic reactive power compensation device is determined. svg If the expression corresponding to the second reactive power control mode is the third constant reactive current control mode, then the current I before the dynamic reactive power compensation device fault can be determined based on the current before the fault in the dynamic reactive power compensation device. q0 The reference voltage V is adjusted based on the actual controller parameters, combined with the high voltage ride-through factor k2 and the high voltage ride-through voltage. Hmin The range of values ​​for V is adjusted accordingly. Hmin I N Or k2, thus obtaining the intermediate reactive power control mode, intermediate adjustment coefficient, or intermediate specified value. Similarly, if the expression corresponding to the second reactive power control mode is the fourth fixed reactive current control mode, V also needs to be adjusted. Hmin I N Or k2, the method is the same as above.

[0179] S324. Jump to execute the step of adjusting the transient parameters corresponding to the initial stable model using the actual controller parameters to obtain the intermediate stable model, until the third reactive current is equal to the first reactive current, and determine the intermediate stable model at the current moment as the target stable model.

[0180] In this embodiment of the invention, the intermediate reactive power control method, intermediate adjustment coefficient, or intermediate specified value obtained by adjustment are used to adjust the second reactive power control method, second specified value, or second adjustment coefficient in the initial stable model. Other transient parameters of the initial stable model are adjusted in conjunction with the actual controller parameters to obtain the adjusted intermediate stable model. The intermediate stable model is then run again in a voltage rise scenario to obtain the second instantaneous voltage and second instantaneous current corresponding to the voltage rise scenario. Discrete Fourier transform and PARK transform are performed on the second instantaneous voltage and second instantaneous current. Combined with the first positive sequence voltage formula, the first reactive power formula, and the first reactive current formula, the adjusted third reactive current is calculated. The third reactive current is compared with the first reactive current. If the third reactive current is not equal to the first reactive current, the second reactive power control method, second adjustment coefficient, or second specified value of the high-voltage ride-through module is adjusted according to the preset fourth adjustment gradient. The above steps are repeated until the third reactive current is equal to the first reactive current. The third reactive current at the current moment is determined as the target reactive current corresponding to the target stable model.

[0181] Step 209: If the fault power data is equal to the measured power data, then the intermediate stable model at the current moment is determined as the target stable model.

[0182] In this embodiment of the invention, the transient parameters corresponding to the initial stable model are adjusted under two operating states: first reactive power and second reactive power, in conjunction with the actual controller parameters at the grid end, to obtain an intermediate stable model. The intermediate stable model is then run under voltage rise and voltage drop scenarios to calculate the corresponding fault power data. This fault power data is compared with the measured power data calculated from the power information extracted from the measured waveforms of the corresponding scenarios at the grid end. If the fault power data and the measured power data are equal, the intermediate stable model at the current moment is directly determined as the target stable model.

[0183] like Figure 3 As shown, step 1: Use electromechanical transient simulation software to construct a power flow model of the dynamic reactive power compensation device and the infinite bus system;

[0184] Step 2: Calculate the corresponding measured power data based on the power information extracted from the measured waveform;

[0185] Step 3: Using electromechanical transient simulation software, update the initial state data according to the high-power and low-power operating states of the dynamic reactive power compensation device to obtain the first reactive power, the second reactive power and the corresponding additional power data. Based on the first reactive power, the second reactive power and the corresponding additional power data output by the power flow model, construct the initial stability model corresponding to the dynamic reactive power compensation device.

[0186] Step 4: Adjust the transient parameters corresponding to the initial stable model using the actual controller parameters to obtain the intermediate stable model;

[0187] Step 5: Run the intermediate stability model in voltage drop and voltage rise scenarios, and output the corresponding fault power data;

[0188] Step 6: Compare the fault power data with the measured power data. If they are not equal, adjust the transient parameters and proceed to step 4 until the fault power data and the measured power data are equal. If they are equal, determine the intermediate stable model at the current moment as the target stable model and end the modeling process.

[0189] In this embodiment of the invention, a power flow model corresponding to the dynamic reactive power compensation device is constructed using initial power parameters, and initial state data is extracted. The initial state data is updated according to the high-power and low-power operating states of the dynamic reactive power compensation device to obtain an initial stability model corresponding to the dynamic reactive power compensation device. From the measured waveforms and actual controller parameters at the grid end, the high-voltage side three-phase instantaneous voltage and three-phase instantaneous current of the measured waveforms are obtained. Discrete Fourier transform and PARK transform are performed on the three-phase instantaneous voltage and three-phase instantaneous current, and the measured power data is calculated by combining the first positive sequence voltage formula, the first reactive power formula, and the first reactive current formula.

[0190] The intermediate stable model is obtained by adjusting the transient parameters corresponding to the initial stable model using actual controller parameters. The intermediate stable model is then run under voltage drop and voltage rise scenarios corresponding to the measured waveforms, outputting corresponding fault power data. This fault power data is compared with the measured power data. If the fault power data and measured power data are not equal, the transient parameters are adjusted until they are equal. If they are equal, the intermediate stable model at the current moment is directly determined as the target stable model. This invention solves the technical problem that existing dynamic reactive power compensation device modeling methods are based on general theoretical models, lack verification with actual operating data, and cannot accurately simulate the actual operating characteristics of the dynamic reactive power compensation device, resulting in low applicability of the generated dynamic reactive power compensation device model. This invention can simulate the transient process output characteristics of the dynamic reactive power compensation device under high-power and low-power operating conditions, using voltage cross-fault scenarios corresponding to the measured waveforms at the grid end, and compare and adjust with the measured power data to obtain a target stable model with higher applicability.

[0191] Please see Figure 4 , Figure 4 This is a structural block diagram of a modeling system for a dynamic reactive power compensation device provided in Embodiment 3 of the present invention.

[0192] This invention provides a modeling system for a dynamic reactive power compensation device, comprising:

[0193] The initial stability model construction module 401 is used to construct the initial stability model corresponding to the dynamic reactive power compensation device in response to the received initial power parameters.

[0194] The measured power data calculation module 402 is used to calculate the corresponding measured power data based on the power information extracted from the measured waveform when the measured waveform and actual controller parameters corresponding to the power grid are received.

[0195] The intermediate stability model is obtained by module 403, which is used to adjust the transient parameters corresponding to the initial stability model using the actual controller parameters to obtain the intermediate stability model.

[0196] The fault power data output module 404 is used to run an intermediate stability model in a preset voltage ride-through fault scenario and output fault power data.

[0197] The first target stability model is obtained by module 405, which is used to adjust transient parameters if the fault power data is not equal to the measured power data, so as to obtain the target stability model corresponding to the dynamic reactive power compensation device.

[0198] Optionally, the initial stable model construction module 401 includes:

[0199] The initial state data extraction module is used to construct the power flow model corresponding to the dynamic reactive power compensation device when the input initial power parameters are received, and to extract the initial state data, which includes the reactive power output by the power flow model and additional power data.

[0200] The first reactive power acquisition module is used to update the reactive power according to the dynamic output characteristics of the power flow model under the preset high-power operating state, and obtain the first reactive power.

[0201] The second reactive power acquisition module is used to update the reactive power according to the dynamic output characteristics of the power flow model under the preset low power operation state, and obtain the second reactive power.

[0202] The initial stability model construction submodule is used to update additional power data based on the first reactive power and the second reactive power, respectively, and construct the initial stability model corresponding to the dynamic reactive power compensation device.

[0203] Optionally, the measured power data calculation module 402 includes:

[0204] The instantaneous voltage and current acquisition module is used to acquire the three-phase instantaneous voltage and three-phase instantaneous current of the high-voltage side of the measured waveform when the measured waveform and actual controller parameters corresponding to the grid end are received.

[0205] The fundamental phase voltage and current acquisition module is used to perform discrete Fourier transform on the three-phase instantaneous voltage and three-phase instantaneous current on the high-voltage side to obtain the fundamental phase voltage and fundamental phase current.

[0206] The module for obtaining the positive sequence components of the fundamental phase voltage and current is used to calculate the fundamental phase voltage and fundamental phase current using the PARK transform, and obtain the positive sequence components of the fundamental phase voltage and fundamental phase current.

[0207] The measured power data acquisition module is used to obtain measured power data based on the positive sequence components of the fundamental phase voltage and the fundamental phase current.

[0208] Optionally, the fault power data output module 404 includes:

[0209] The module for obtaining the first instantaneous voltage and current is used to run an intermediate stable model in a voltage drop scenario to obtain the first instantaneous voltage and the first instantaneous current corresponding to the voltage drop scenario.

[0210] The voltage dip fault power data acquisition module is used to perform discrete Fourier transform and PARK transform on the first instantaneous voltage and the first instantaneous current through an intermediate stability model, and output the fault power data corresponding to the voltage dip scenario.

[0211] The second instantaneous voltage and current acquisition module is used to run an intermediate stable model in a voltage rise scenario to obtain the second instantaneous voltage and the second instantaneous current corresponding to the voltage rise scenario.

[0212] The voltage rise fault power data acquisition module is used to perform discrete Fourier transform and PARK transform on the second instantaneous voltage and the second instantaneous current through an intermediate stability model, and output the fault power data corresponding to the voltage rise scenario.

[0213] Optionally, the first objective stabilization model obtaining module 405 includes:

[0214] The voltage dip target stability model is obtained by a module, which is used for intermediate stability models including a low voltage ride-through fault module and a low voltage ride-through module. When the voltage ride-through fault scenario is a voltage dip scenario, the fault power data includes the second positive sequence voltage, the second reactive current, and the second reactive power. If the fault power data is not equal to the measured power data, the transient parameters are adjusted to obtain the target stability model corresponding to the dynamic reactive power compensation device.

[0215] Furthermore, the voltage sag target stability model module can also perform the following steps:

[0216] If the second positive sequence voltage is not equal to the first positive sequence voltage, the initial fault resistance per unit value corresponding to the low voltage ride-through fault module is adjusted to the intermediate fault resistance per unit value according to the preset first adjustment gradient.

[0217] The jump execution steps are to adjust the transient parameters corresponding to the initial stable model using the actual controller parameters to obtain the intermediate stable model, until the second positive sequence voltage is equal to the first positive sequence voltage, and the intermediate stable model at the current moment is determined as the target stable model;

[0218] If the second reactive current is not equal to the first reactive current, the first reactive control mode, the first adjustment coefficient or the first specified value of the low voltage ride-through module will be adjusted to the intermediate reactive control mode, the intermediate adjustment coefficient or the intermediate specified value according to the preset second adjustment gradient.

[0219] The jump execution involves adjusting the transient parameters corresponding to the initial stable model using the actual controller parameters to obtain the intermediate stable model, until the second reactive current equals the first reactive current, and then determining the intermediate stable model at the current moment as the target stable model.

[0220] The voltage rise target stability model is obtained by a module, which is used for intermediate stability models including a high voltage ride-through fault module and a high voltage ride-through module. When the voltage ride-through fault scenario is a voltage rise scenario, the fault power data includes the third positive sequence voltage, the third reactive current, and the third reactive power. If the fault power data is not equal to the measured power data, the transient parameters are adjusted to obtain the target stability model corresponding to the dynamic reactive power compensation device.

[0221] Furthermore, the voltage rise target stability model module can also perform the following steps:

[0222] If the third positive sequence voltage is not equal to the first positive sequence voltage, the initial constant impedance load reactive power change value corresponding to the high voltage ride-through fault module will be adjusted to the intermediate constant impedance load reactive power change value according to the preset third adjustment gradient.

[0223] The jump execution steps are to adjust the transient parameters corresponding to the initial stable model using the actual controller parameters to obtain the intermediate stable model, until the third positive sequence voltage is equal to the first positive sequence voltage, and the intermediate stable model at the current moment is determined as the target stable model;

[0224] If the third reactive current is not equal to the first reactive current, the second reactive control mode, the second adjustment coefficient or the second specified value of the high voltage ride-through module will be adjusted to the intermediate reactive control mode, the intermediate adjustment coefficient or the intermediate specified value according to the preset fourth adjustment gradient.

[0225] The jump execution involves adjusting the transient parameters corresponding to the initial stable model using the actual controller parameters to obtain the intermediate stable model, until the third reactive current equals the first reactive current, at which point the intermediate stable model at the current moment is determined as the target stable model.

[0226] Optionally, the system also includes:

[0227] The second objective stability model acquisition module is used to determine the intermediate stability model at the current moment as the objective stability model if the fault power data is equal to the measured power data.

[0228] In this embodiment of the invention, a power flow model corresponding to the dynamic reactive power compensation device is constructed using initial power parameters, and initial state data is extracted. The initial state data is updated according to the high-power and low-power operating states of the dynamic reactive power compensation device to obtain an initial stability model corresponding to the dynamic reactive power compensation device. From the measured waveforms and actual controller parameters at the grid end, the high-voltage side three-phase instantaneous voltage and three-phase instantaneous current of the measured waveforms are obtained. Discrete Fourier transform and PARK transform are performed on the three-phase instantaneous voltage and three-phase instantaneous current, and the measured power data is calculated by combining the first positive sequence voltage formula, the first reactive power formula, and the first reactive current formula.

[0229] The intermediate stable model is obtained by adjusting the transient parameters corresponding to the initial stable model using actual controller parameters. The intermediate stable model is then run under voltage drop and voltage rise scenarios corresponding to the measured waveforms, outputting corresponding fault power data. This fault power data is compared with the measured power data. If they are not equal, the transient parameters are adjusted until they are equal. If they are equal, the intermediate stable model at the current moment is directly determined as the target stable model. This solves the technical problem of existing dynamic reactive power compensation device modeling methods being based on general theoretical models without verification from actual operating data, thus failing to accurately simulate the actual operating characteristics of the dynamic reactive power compensation device and resulting in low applicability of the generated model. This new model can simulate the transient output characteristics of the dynamic reactive power compensation device under high-power and low-power operating conditions, using voltage cross-fault scenarios corresponding to the measured waveforms at the grid end. The model is then compared and adjusted with the measured power data to obtain a more applicable target stable model.

[0230] An electronic device according to an embodiment of the present invention includes: a memory and a processor, wherein the memory stores a computer program; when the computer program is executed by the processor, the processor performs a modeling method for a dynamic reactive power compensation device as described in any of the above embodiments.

[0231] The memory can be an electronic memory such as flash memory, EEPROM (Electrically Erasable Programmable Read-Only Memory), EPROM, hard disk, or ROM. The memory has storage space for program code used to perform any of the method steps described above. For example, the storage space for program code may include individual program codes for implementing the various steps in the methods described above. This program code can be read from or written to one or more computer program products. These computer program products include program code carriers such as hard disks, CDs, memory cards, or floppy disks. The program code may be compressed, for example, in a suitable form. When run by a computing processing device, this code causes the computing processing device to perform the various steps in the job recommendation methods described above.

[0232] This invention also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements a modeling method for a dynamic reactive power compensation device as described in any of the above embodiments.

[0233] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0234] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, or indirect coupling or communication connection between apparatuses or units, and may be electrical, mechanical, or other forms.

[0235] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0236] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0237] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0238] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A modeling method for a dynamic reactive power compensation device, characterized in that, include: In response to the received initial power parameters, an initial stability model corresponding to the dynamic reactive power compensation device is constructed. When the measured waveform and actual controller parameters corresponding to the power grid are received, the corresponding measured power data are calculated based on the power information extracted from the measured waveform. The transient parameters corresponding to the initial stable model are adjusted using the actual controller parameters to obtain an intermediate stable model. The intermediate stability model is run under a preset voltage ride-through fault scenario, and fault power data is output. If the fault power data is not equal to the measured power data, the transient parameters are adjusted to obtain the target stability model corresponding to the dynamic reactive power compensation device. The steps of constructing the initial stability model corresponding to the dynamic reactive power compensation device based on the received initial power parameters include: When the initial power parameters are received, a power flow model corresponding to the dynamic reactive power compensation device is constructed, and the initial state data is extracted. The initial state data includes the reactive power output by the power flow model and the additional power data. According to the dynamic output characteristics of the power flow model under the preset high-power operating state, the reactive power is updated to obtain the first reactive power; According to the dynamic output characteristics of the power flow model under the preset low-power operating state, the reactive power is updated to obtain the second reactive power; Based on the first reactive power and the second reactive power, the additional power data are updated respectively, and an initial stability model corresponding to the dynamic reactive power compensation device is constructed. The initial power parameters include network topology, component parameters, and load parameter conditions; The initial stability model refers to the initial model established using electromechanical transient simulation software to calculate the transient process output characteristics of the dynamic reactive power compensation device; The measured power data includes the first positive sequence voltage, the first reactive current, and the first reactive power.

2. The modeling method for the dynamic reactive power compensation device according to claim 1, characterized in that, The step of calculating the corresponding measured power data based on the power information extracted from the measured waveform when the measured waveform and actual controller parameters corresponding to the power grid are received includes: When the measured waveform and actual controller parameters corresponding to the grid are received, the high-voltage side three-phase instantaneous voltage and three-phase instantaneous current of the measured waveform are obtained; The three-phase instantaneous voltage and three-phase instantaneous current on the high-voltage side are subjected to discrete Fourier transform to obtain the fundamental phase voltage and fundamental phase current. The fundamental phase voltage and fundamental phase current are calculated using the PARK transform to obtain the positive sequence components of the fundamental phase voltage and the fundamental phase current. The measured power data are obtained based on the positive sequence components of the fundamental phase voltage and the fundamental phase current.

3. The modeling method for the dynamic reactive power compensation device according to claim 1, characterized in that, The voltage ride-through fault scenarios include voltage dip scenarios and voltage rise scenarios; the step of running the intermediate stability model in the preset voltage ride-through fault scenarios and outputting fault power data includes: The intermediate stability model is run in the voltage drop scenario to obtain the first instantaneous voltage and the first instantaneous current corresponding to the voltage drop scenario; The intermediate stability model is used to perform discrete Fourier transform and PARK transform on the first instantaneous voltage and the first instantaneous current to output the fault power data corresponding to the voltage drop scenario. The intermediate stability model is run under the voltage rise scenario to obtain the second instantaneous voltage and the second instantaneous current corresponding to the voltage rise scenario; The intermediate stability model is used to perform discrete Fourier transform and PARK transform on the second instantaneous voltage and the second instantaneous current to output the fault power data corresponding to the voltage rise scenario.

4. The modeling method for the dynamic reactive power compensation device according to claim 3, characterized in that, The intermediate stability model includes a low-voltage ride-through fault module and a low-voltage ride-through module; when the voltage ride-through fault scenario is a voltage drop scenario, the fault power data includes a second positive sequence voltage, a second reactive current, and a second reactive power; the step of adjusting the transient parameters to obtain the target stability model corresponding to the dynamic reactive power compensation device if the fault power data is not equal to the measured power data includes: If the second positive sequence voltage is not equal to the first positive sequence voltage, the initial fault resistance per unit value corresponding to the low voltage ride-through fault module is adjusted to the intermediate fault resistance per unit value according to the preset first adjustment gradient. Jump to execute the step of adjusting the transient parameters corresponding to the initial stable model using the actual controller parameters to obtain the intermediate stable model, until the second positive sequence voltage is equal to the first positive sequence voltage, and determine the intermediate stable model at the current moment as the target stable model; If the second reactive current is not equal to the first reactive current, then the first reactive control mode, the first adjustment coefficient or the first specified value of the low voltage ride-through module will be adjusted to the intermediate reactive control mode, the intermediate adjustment coefficient or the intermediate specified value according to the preset second adjustment gradient. The process jumps to the step of adjusting the transient parameters corresponding to the initial stable model using the actual controller parameters to obtain the intermediate stable model, until the second reactive current is equal to the first reactive current, and the intermediate stable model at the current moment is determined as the target stable model.

5. The modeling method for the dynamic reactive power compensation device according to claim 3, characterized in that, The intermediate stability model includes a high-voltage ride-through fault module and a high-voltage ride-through module; when the voltage ride-through fault scenario is a voltage rise scenario, the fault power data includes the third positive sequence voltage, the third reactive current, and the third reactive power; the step of adjusting the transient parameters to obtain the target stability model corresponding to the dynamic reactive power compensation device if the fault power data is not equal to the measured power data includes: If the third positive sequence voltage is not equal to the first positive sequence voltage, the initial constant impedance load reactive power change value corresponding to the high voltage ride-through fault module is adjusted to the intermediate constant impedance load reactive power change value according to the preset third adjustment gradient. Jump to execute the step of adjusting the transient parameters corresponding to the initial stable model using the actual controller parameters to obtain the intermediate stable model, until the third positive sequence voltage is equal to the first positive sequence voltage, and determine the intermediate stable model at the current moment as the target stable model; If the third reactive current is not equal to the first reactive current, then the second reactive control mode, the second adjustment coefficient or the second specified value of the high voltage ride-through module will be adjusted to the intermediate reactive control mode, the intermediate adjustment coefficient or the intermediate specified value according to the preset fourth adjustment gradient. The process jumps to the step of adjusting the transient parameters corresponding to the initial stable model using the actual controller parameters to obtain the intermediate stable model, until the third reactive current is equal to the first reactive current, and the intermediate stable model at the current moment is determined as the target stable model.

6. The modeling method for the dynamic reactive power compensation device according to claim 1, characterized in that, The method further includes: If the fault power data is equal to the measured power data, then the intermediate stable model at the current moment is determined as the target stable model.

7. A modeling system for a dynamic reactive power compensation device, characterized in that, include: The initial stability model construction module is used to construct the initial stability model corresponding to the dynamic reactive power compensation device in response to the received initial power parameters. The measured power data calculation module is used to calculate the corresponding measured power data based on the power information extracted from the measured waveform when the measured waveform and actual controller parameters corresponding to the power grid are received. The intermediate stability model acquisition module is used to adjust the transient parameters corresponding to the initial stability model using the actual controller parameters to obtain the intermediate stability model. The fault power data output module is used to run the intermediate stability model in a preset voltage ride-through fault scenario and output fault power data. The first target stability model acquisition module is used to adjust the transient parameters if the fault power data is not equal to the measured power data, so as to obtain the target stability model corresponding to the dynamic reactive power compensation device. The initial stable model construction module includes: The initial state data extraction module is used to construct the power flow model corresponding to the dynamic reactive power compensation device when the input initial power parameters are received, and to extract the initial state data, which includes the reactive power output by the power flow model and the additional power data. The first reactive power acquisition module is used to update the reactive power according to the dynamic output characteristics of the power flow model under the preset high-power operation state, and obtain the first reactive power. The second reactive power acquisition module is used to update the reactive power according to the dynamic output characteristics of the power flow model under the preset low power operation state, and obtain the second reactive power. The initial stability model construction submodule is used to update the additional power data according to the first reactive power and the second reactive power respectively, and construct the initial stability model corresponding to the dynamic reactive power compensation device. The initial power parameters include network topology, component parameters, and load parameter conditions; The initial stability model refers to the initial model established using electromechanical transient simulation software to calculate the transient process output characteristics of the dynamic reactive power compensation device; The measured power data includes the first positive sequence voltage, the first reactive current, and the first reactive power.

8. An electronic device, characterized in that, It includes a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor causes the processor to perform the steps of the modeling method for the dynamic reactive power compensation device as described in any one of claims 1-6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed, it implements the modeling method for the dynamic reactive power compensation device as described in any one of claims 1-6.

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