Damping determination method for active voltage support of power supply of network following type power electronic interface

Abstract

The invention provides a damping determination method for active voltage support of a grid-following type power electronic interface power supply, and relates to the technical field of power electronics, and the method comprises the steps: obtaining a typical active voltage support strategy of the grid-following type power electronic interface power supply; based on a typical active voltage support strategy, determining a linearized small disturbance model of the following network type power electronic interface power supply; and determining the target damping of the following network type power electronic interface power supply under the typical active voltage support strategy based on the linearized small disturbance model. According to the technical scheme, by constructing the linearized small disturbance model, the target damping of the following network type power electronic interface power supply under the typical active voltage support strategy can be quantitatively determined, and compared with the prior art, the method is more suitable for stability analysis of the power electronic interface power supply.

Description

Technical Field

[0001] This invention relates to the field of power electronics technology, and in particular to a method for determining the damping of active voltage support for grid-connected power electronic interface power supplies. Background Technology

[0002] With the increasing penetration rate of renewable energy sources such as wind power and photovoltaics, and the continuous commissioning of large-capacity DC projects, the stability issues of new power systems have become prominent. Analyzing the stability mechanism of power electronic interface power supplies in these new power systems is of great significance for the safe and stable operation of the power grid under these new conditions.

[0003] Currently, power electronic interface power supplies mainly adopt grid-following control. With the increasing proportion of new energy sources, voltage stability issues in new power systems are becoming more prominent. Active voltage support is one of the control strategies of grid-following power electronic interface power supplies, which can provide some protection for system voltage stability. However, it also affects the existing stability of the system. Due to the diversity of its control strategies and the complexity of its control links, existing methods cannot quantify its damping, making it difficult to guide the stability analysis of power electronic interface power supplies. Summary of the Invention

[0004] This invention provides a method for determining the damping of active voltage support in grid-connected power electronic interface power supplies. This method addresses the shortcomings of existing technologies where the damping under active voltage support strategies cannot be quantified, thus hindering the stability analysis of power electronic interface power supplies. The technical solution of this invention, by constructing a linearized small perturbation model, can quantify and determine the target damping of grid-connected power electronic interface power supplies under typical active voltage support strategies. Compared with existing technologies, this method is more suitable for the stability analysis of power electronic interface power supplies.

[0005] This invention provides a method for determining the damping of active voltage support for grid-connected power electronic interface power supplies, comprising the following steps.

[0006] Typical active voltage support strategies for grid-connected power electronic interface power supplies; Based on the typical active voltage support strategy, a linearized small perturbation model for the grid-connected power electronic interface power supply is determined. The target damping of the grid-connected power electronic interface power supply under the typical active voltage support strategy is determined based on the linearized small perturbation model.

[0007] According to the present invention, a damping determination method for active voltage support of grid-connected power electronic interface power supply is provided, wherein the typical active voltage support strategy includes: constant reactive power control strategy, constant AC voltage control strategy and initial small disturbance model. The determination of the linearized small perturbation model of the grid-connected power electronic interface power supply based on the typical active voltage support strategy includes: Linearization modeling is performed on the constant reactive power control strategy and the constant AC voltage control strategy respectively to obtain the linearized model of constant reactive power control corresponding to the constant reactive power control strategy and the linearized model of constant AC voltage control corresponding to the constant AC voltage control strategy. The linearized small disturbance model is determined based on the constant reactive power control linearization model, the constant AC voltage control linearization model, and the initial small disturbance model.

[0008] According to the present invention, a method for determining the damping of active voltage support for a grid-connected power electronic interface power supply, wherein determining the target damping of the grid-connected power electronic interface power supply under the typical active voltage support strategy based on the linearized small perturbation model includes: The complex torque of the grid-connected power electronic interface power supply under the typical active voltage support strategy is determined based on the linearized small perturbation model. The target damping of the grid-connected power electronic interface power supply under the typical active voltage support strategy is determined based on the complex torque.

[0009] According to the present invention, a method for determining the damping of an active voltage support for a grid-connected power electronic interface power supply is provided. The method for determining the target damping of the grid-connected power electronic interface power supply under the typical active voltage support strategy based on the complex torque includes: The damping coefficient and the sign of the target damping are determined based on the complex torque. The damping value corresponding to the target damping is determined based on the damping coefficient; The target damping is determined based on the positive or negative sign corresponding to the target damping and the damping value.

[0010] According to the present invention, a method for determining the damping of active voltage support of a grid-connected power electronic interface power supply is provided, wherein the complex torque includes: constant reactive power control negative torque and constant AC voltage control negative torque; The determination of the complex torque of the grid-connected power electronic interface power supply under the typical active voltage support strategy based on the linearized small perturbation model includes: in, This represents the d-axis component of the constant reactive power control negative torque in the dq coordinate system. This represents the q-axis component of the constant reactive power control negative torque in the dq coordinate system. Indicates the grid voltage. Indicates the converter phase. This represents the q-axis current of the converter. This represents the d-axis current of the converter. This represents the d-axis current loop transfer function of the converter. This represents the q-axis current loop transfer function of the converter. This represents the proportional gain of the reactive power loop in the converter. This represents the integral coefficient of the reactive power loop of the converter. Represents the Laplace operator. represents an imaginary number, e It is a natural constant. This indicates the phase correction amount. This represents the d-axis component of the constant AC voltage controlled negative torque in the dq coordinate system. This represents the q-axis component of the constant AC voltage controlled negative torque in the dq coordinate system. This represents a small disturbance in the converter phase. Indicates the inductive reactance of the transmission line. Indicates the oscillation frequency of the offering. This represents the proportional gain of the AC voltage loop in the converter. This represents the integral coefficient of the AC voltage loop of the converter.

[0011] According to the present invention, a method for determining the damping of active voltage support of a grid-connected power electronic interface power supply is provided, wherein the damping coefficient includes: a constant reactive power control damping coefficient and a constant AC voltage control damping coefficient. The determination of the damping coefficient based on the complex torque includes: in, This represents the d-axis component of the constant reactive power control damping coefficient in the dq coordinate system. This represents the q-axis component of the constant reactive power control damping coefficient in the dq coordinate system. represents an imaginary number, Indicates the subsynchronous oscillation angular frequency. This represents the d-axis component of the constant AC voltage control damping coefficient in the dq coordinate system. This represents the q-axis component of the constant AC voltage control damping coefficient in the dq coordinate system.

[0012] The present invention also provides a damping determination device for active voltage support of a grid-connected power electronic interface power supply, comprising the following modules: The acquisition module is used to acquire typical active voltage support strategies for grid-connected power electronic interface power supplies. The first determining module is used to determine the linearized small perturbation model of the grid-connected power electronic interface power supply based on the typical active voltage support strategy. The second determining module is used to determine the target damping of the grid-connected power electronic interface power supply under the typical active voltage support strategy based on the linearized small perturbation model.

[0013] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, it implements the damping determination method for active voltage support of grid-connected power electronic interface power supply as described above.

[0014] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the damping determination method for active voltage support of grid-connected power electronic interface power supply as described above.

[0015] The present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the damping determination method for active voltage support of grid-connected power electronic interface power supply as described above.

[0016] This invention provides a method for determining the damping of active voltage support in grid-connected power electronic interface power supplies. The method involves obtaining a typical active voltage support strategy for the grid-connected power electronic interface power supply; determining a linearized small perturbation model of the grid-connected power electronic interface power supply based on the typical active voltage support strategy; and determining the target damping of the grid-connected power electronic interface power supply under the typical active voltage support strategy based on the linearized small perturbation model. This invention, by constructing a linearized small perturbation model, can quantitatively determine the target damping of the grid-connected power electronic interface power supply under the typical active voltage support strategy, making it more suitable for stability analysis of power electronic interface power supplies compared to existing technologies. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this 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 some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a flowchart illustrating the method for determining the damping of active voltage support for grid-connected power electronic interface power supplies provided by the present invention.

[0019] Figure 2 This is one of the structural block diagrams of a typical active voltage support strategy provided by the present invention.

[0020] Figure 3 This is one of the structural block diagrams of a typical active voltage support strategy provided by the present invention.

[0021] Figure 4 This is a structural block diagram of the constant reactive power control linearization model and the constant AC voltage control linearization model provided by the present invention.

[0022] Figure 5 This is a Bode plot of the negative torque for constant reactive power control when parameters change, provided by the present invention.

[0023] Figure 6 This is a schematic diagram showing the change of the constant reactive power control damping coefficient when the parameters provided by this invention change.

[0024] Figure 7 This is a Bode diagram illustrating the control of negative torque by constant AC voltage when parameters change, provided by the present invention.

[0025] Figure 8 This is a schematic diagram illustrating the change of the damping coefficient under constant AC voltage control when the parameters provided by this invention change.

[0026] Figure 9 This is a schematic diagram of the damping determination device for active voltage support of grid-connected power electronic interface power supply provided by the present invention.

[0027] Figure 10 This is a schematic diagram of the structure of the electronic device provided by the present invention. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0029] To address the aforementioned problems in the prior art, this invention provides a method for determining the damping of active voltage support for grid-connected power electronic interface power supplies. Figure 1 This is one of the flowcharts illustrating the method for determining the damping of active voltage support for grid-connected power electronic interface power supplies provided by the present invention, such as... Figure 1 As shown, the method includes the following steps 110 to 130.

[0030] Step 110: Obtain the typical active voltage support strategy for grid-connected power electronic interface power supplies.

[0031] Specifically, the grid-connected power electronic interface power supply can be, for example, a grid-connected voltage source grid-connected converter, or other equipment; this embodiment of the invention does not impose specific limitations here. It can also obtain a typical active voltage support strategy for the grid-connected power electronic interface power supply.

[0032] Step 120: Determine the linearized small perturbation model of the grid-connected power electronic interface power supply based on the typical active voltage support strategy.

[0033] In one embodiment, the typical active voltage support strategy includes: a constant reactive power control strategy, a constant AC voltage control strategy, and an initial small disturbance model; The determination of the linearized small perturbation model of the grid-connected power electronic interface power supply based on the typical active voltage support strategy includes: Linearization modeling is performed on the constant reactive power control strategy and the constant AC voltage control strategy respectively to obtain the linearized model of constant reactive power control corresponding to the constant reactive power control strategy and the linearized model of constant AC voltage control corresponding to the constant AC voltage control strategy. The linearized small disturbance model is determined based on the constant reactive power control linearization model, the constant AC voltage control linearization model, and the initial small disturbance model.

[0034] Specifically, typical active voltage support strategies include: constant reactive power control strategy (Power Controller), constant AC voltage control strategy (Voltage Controller), and initial small disturbance model. Figure 2 This is one of the structural block diagrams of a typical active voltage support strategy provided by the present invention. Figure 3 This is a second structural block diagram of a typical active voltage support strategy provided by the present invention, as shown below. Figure 2 As shown, Figure 2 In (a), the red portion represents the constant reactive power control strategy. Figure 2 In (a), the blue part represents the constant AC voltage control strategy. Figure 2 (b) Figure 2 (c) and Figure 3 The term "common" represents the initial small perturbation model. Figure 3 It can also represent the frequency domain small-signal model of the constant current control strategy, where, Figure 2 (b) indicates the support process after the control voltage is applied. Figure 2 (c) represents a phase-locked loop. Figure 2 middle This indicates the reactive power command value of the converter. Indicates the reactive power of the converter. This indicates the AC voltage command value for the converter. This indicates the AC voltage of the converter; Mode Selection indicates the model selection. This indicates the q-axis current command value of the converter. This indicates the commanded value of the converter's d-axis current. This represents the q-axis current of the converter. This represents the d-axis current of the converter. Indicates the phase of the converter's phase-locked loop. Indicates the synchronization / control coordinate system. Indicates the filter reactance. This represents the proportional gain of the converter current loop. This represents the integral coefficient of the converter current loop. This indicates the commanded value of the electromotive force within the d-axis of the converter. This indicates the q-axis internal potential command value of the converter; PWM stands for Pulse Width Modulation. This represents the internal potential of the converter. This represents the three-phase voltage at the converter's grid connection point. This represents the q-axis voltage of the converter. This represents the integral coefficient of the converter's phase-locked loop. This represents the integral coefficient of the converter's phase-locked loop. This represents the angular frequency of the converter's phase-locked loop. Figure 3 In this context, PLL stands for Phase-Locked Loop of the converter, Current Controller refers to the current controller, Line Dynamics refers to the transmission line dynamics, and Outer Controller Interface refers to the outer loop controller interface. Indicates line inductance. Indicates the line resistance. This indicates taking a small perturbation. and It can represent the model interface for phase-locked loops, current control loops, and dynamic and active voltage support strategies for transmission lines. , , , Both represent transfer functions, which can be expressed by the following formula: in, express , where is the total impedance of the converter.

[0035] Furthermore, linearization modeling can be performed on the constant reactive power control strategy and the constant AC voltage control strategy respectively, resulting in linearized models for constant reactive power control and constant AC voltage control. For example, Figure 4This is a structural block diagram of the constant reactive power control linearization model and the constant AC voltage control linearization model provided by the present invention, as shown below. Figure 4 As shown, the constant reactive power control linearization model (RPC) is represented in red, and the constant AC voltage control linearization model (AC Voltage Controller, AVC) is represented in blue. Figure 4 middle This represents the d-axis voltage of the converter.

[0036] After obtaining the linearized models for constant reactive power control and constant AC voltage control, the linearized small disturbance model can be determined based on these models and the initial small disturbance model. In other words, the linearized small disturbance model can be replaced by the linearized models for constant reactive power control and constant AC voltage control. Figure 2 (a) combines the constant reactive power control strategy and the constant AC voltage control strategy. Figure 4 Replaced Figure 2 and Figure 3 This can represent a linearized small perturbation model.

[0037] In the above embodiments, the constant reactive power control strategy and the constant AC voltage control strategy are linearized and modeled respectively, thereby determining the linearized small disturbance model, so that the damping can be quantified in the future.

[0038] Step 130: Determine the target damping of the grid-connected power electronic interface power supply under the typical active voltage support strategy based on the linearized small perturbation model.

[0039] Specifically, the target damping of the grid-connected power electronic interface power supply under a typical active voltage support strategy can be obtained by solving the small disturbance model linearized by the complex torque coefficient method.

[0040] In one embodiment, determining the target damping of the grid-connected power electronic interface power supply under the typical active voltage support strategy based on the linearized small perturbation model includes: The complex torque of the grid-connected power electronic interface power supply under the typical active voltage support strategy is determined based on the linearized small perturbation model. The target damping of the grid-connected power electronic interface power supply under the typical active voltage support strategy is determined based on the complex torque.

[0041] Specifically, the complex torque of the grid-connected power electronic power supply under a typical active voltage support strategy can be determined based on a linearized small perturbation model. Furthermore, the target damping of the grid-connected power electronic power supply under a typical active voltage support strategy can be determined based on the complex torque.

[0042] In the above embodiments, the complex torque is determined by the complex torque coefficient method, and then the target damping of the grid-connected power electronic interface power supply under the typical active voltage support strategy is determined. Based on the target damping, the small disturbance stability mechanism of the active voltage support of the power electronic power system can be revealed, and the stability characteristics of the power grid can be improved.

[0043] In one embodiment, determining the target damping of the grid-connected power electronic interface power supply under the typical active voltage support strategy based on the complex torque includes: The damping coefficient and the sign of the target damping are determined based on the complex torque. The damping value corresponding to the target damping is determined based on the damping coefficient; The target damping is determined based on the positive or negative sign corresponding to the target damping and the damping value.

[0044] Specifically, the damping coefficient can be determined based on the complex torque, and the sign of the target damping can also be determined based on the complex torque. Furthermore, the damping value corresponding to the target damping can be determined based on the damping coefficient, and the target damping can be obtained based on the sign and the damping value.

[0045] In the above embodiments, the target damping can be gradually quantified through complex torque, thereby enabling accurate analysis of the stability of the power electronic interface power supply.

[0046] In one embodiment, the complex torque includes: constant reactive power controlled negative torque and constant AC voltage controlled negative torque; The determination of the complex torque of the grid-connected power electronic interface power supply under the typical active voltage support strategy based on the linearized small perturbation model includes: in, This represents the d-axis component of the constant reactive power control negative torque in the dq coordinate system. This represents the q-axis component of the constant reactive power control negative torque in the dq coordinate system. Indicates the grid voltage. Indicates the converter phase. This represents the q-axis current of the converter. This represents the d-axis current of the converter. This represents the d-axis current loop transfer function of the converter. This represents the q-axis current loop transfer function of the converter. This represents the proportional gain of the reactive power loop in the converter. This represents the integral coefficient of the reactive power loop of the converter. Represents the Laplace operator. represents an imaginary number, e It is a natural constant. This indicates the phase correction amount. This represents the d-axis component of the constant AC voltage controlled negative torque in the dq coordinate system. This represents the q-axis component of the constant AC voltage controlled negative torque in the dq coordinate system. This represents a small disturbance in the converter phase. Indicates the inductive reactance of the transmission line. Indicates the oscillation frequency of the offering. This represents the proportional gain of the AC voltage loop in the converter. This represents the integral coefficient of the AC voltage loop of the converter.

[0047] Specifically, This indicates the phase correction amount. This indicates the oscillation frequency of the supply, which is (100 (rad / s). It's easy to understand that the d-axis component and q-axis component of the constant reactive power control negative torque in the dq coordinate system together constitute the constant reactive power control negative torque corresponding to the constant reactive power control strategy. Similarly, the d-axis component and q-axis component of the constant AC voltage control negative torque in the dq coordinate system together constitute the constant AC voltage control negative torque corresponding to the constant AC voltage control strategy.

[0048] In the above embodiments, the constant reactive power control negative torque and constant AC voltage control negative torque can be accurately calculated through specific formulas, laying the foundation for determining the target damping.

[0049] In one embodiment, the damping coefficient includes: a constant reactive power control damping coefficient and a constant AC voltage control damping coefficient; The determination of the damping coefficient based on the complex torque includes: in, This represents the d-axis component of the constant reactive power control damping coefficient in the dq coordinate system. This represents the q-axis component of the constant reactive power control damping coefficient in the dq coordinate system. represents an imaginary number, Indicates the subsynchronous oscillation angular frequency. This represents the d-axis component of the constant AC voltage control damping coefficient in the dq coordinate system. This represents the q-axis component of the constant AC voltage control damping coefficient in the dq coordinate system.

[0050] Specifically, It is easy to understand that the d-axis component and q-axis component of the constant reactive power control damping coefficient in the dq coordinate system together constitute the constant reactive power control damping coefficient corresponding to the constant reactive power control strategy. Similarly, the d-axis component and q-axis component of the constant AC voltage control damping coefficient in the dq coordinate system together constitute the constant AC voltage control damping coefficient corresponding to the constant AC voltage control strategy.

[0051] In the above embodiments, the constant reactive power control damping coefficient and the constant AC voltage control damping coefficient can be accurately calculated using specific formulas, laying the foundation for determining the target damping.

[0052] It should be noted that the parameters used in the calculations of this invention can be obtained when the system reaches its equilibrium point, or they can be preset. This embodiment of the invention does not impose any specific limitations on these parameters.

[0053] For example, after obtaining the complex torque and damping coefficient, the stability of the grid-connected power electronic interface power supply under the active voltage support strategy can be analyzed by adjusting the parameters and based on the changes in the complex torque and damping coefficient. Figure 5 This is a Bode plot of the negative torque for constant reactive power control when parameters change, provided by the present invention. Figure 5 In this context, "Frequency" represents frequency in Hertz (Hz), "Phase" represents phase in degrees (deg), "Magnitude" represents amplitude in decibels (dB), and "Sub-synchronous" represents subsynchronous. (See reference...) Figure 5 When parameters change, from the perspective of phase frequency characteristics, it can be observed that there are [various effects] in the subsynchronous frequency band. and This indicates that constant reactive power control produces negative damping on the d-axis and positive damping on the q-axis. From the perspective of amplitude-frequency response, it can be found that... amplitude ratio The value is several tens of decibels, which indicates that the q-axis component of the constant reactive power control damping coefficient is much larger than the d-axis component. Figure 6 This is a schematic diagram illustrating the change in the constant reactive power control damping coefficient when the parameters provided by this invention change. Figure 6 The Corrected Damping Coefficient is the damping coefficient. When the parameter changes, the comparison... Figure 6 (a) and Figure 6 (b) It can be found that, Based on the above, it can be approximated that constant reactive power control only generates positive damping along the q-axis, and this damping increases with... and It increases with the increase of.

[0054] Figure 7 This is a Bode diagram illustrating the control of negative torque by constant AC voltage when parameters change, provided by the present invention. (Refer to...) Figure 7 When parameters change, there is a frequency band that is in the subsynchronous band. and This indicates that constant reactive power control produces negative damping on both the d-axis and q-axis. Unlike constant reactive power control, the transmission line effect is equivalent to introducing a differentiator, which introduces a 90-degree phase superposition into the original corrected complex torque, thus changing the sign of the q-axis component of the damping coefficient from positive to negative. From the perspective of amplitude-frequency characteristics, it can be observed that... amplitude ratio The value is several tens of decibels, which indicates that the q-axis component of the constant reactive power control damping coefficient is much larger than the d-axis component. Figure 8 This is a schematic diagram illustrating the change in the damping coefficient controlled by the constant AC voltage when the parameters provided by this invention change. (Refer to...) Figure 8 When parameters change, the component of the damping coefficient controlled by the constant AC voltage on the d / q axis and Changes, in comparison Figure 8 (a) and Figure 8 (b) It was found that the q-axis component of the damping coefficient was much larger than the d-axis component at this point, which is consistent with the aforementioned Bode plot analysis, indicating that... Based on the above, it can be approximated that constant AC voltage control only produces negative q-axis damping, and this damping increases with... and It increases as it decreases.

[0055] From the two examples above, the following conclusions can be drawn: (1) The constant reactive power control strategy generates negative damping on the d-axis and positive damping on the q-axis, with q-axis damping being dominant, which is beneficial to improving system stability; its damping increases with the increase of the control PI parameter. (2) The constant AC voltage control strategy generates negative damping on both the d-axis and q-axis, with q-axis damping being dominant, which is detrimental to improving system stability; its damping increases with the decrease of the control PI parameter. It is easy to understand that the above conclusions are obtained under the above parameter settings, and different parameter settings may yield different conclusions.

[0056] This invention provides a method for determining the damping of active voltage support in grid-connected power electronic interface power supplies. The method involves obtaining a typical active voltage support strategy for the grid-connected power electronic interface power supply; determining a linearized small perturbation model of the grid-connected power electronic interface power supply based on the typical active voltage support strategy; and determining the target damping of the grid-connected power electronic interface power supply under the typical active voltage support strategy based on the linearized small perturbation model. This invention, by constructing a linearized small perturbation model, can quantitatively determine the target damping of the grid-connected power electronic interface power supply under the typical active voltage support strategy, making it more suitable for stability analysis of power electronic interface power supplies compared to existing technologies.

[0057] The damping determination device for active voltage support of grid-connected power electronic interface power supply provided by the present invention will be described below. The damping determination device for active voltage support of grid-connected power electronic interface power supply described below can be referred to in correspondence with the damping determination method for active voltage support of grid-connected power electronic interface power supply described above.

[0058] Figure 9 This is a schematic diagram of the damping determination device for active voltage support of grid-connected power electronic interface power supply provided by the present invention, as shown below. Figure 9 As shown, the damping determination device 900 for the active voltage support of the grid-connected power electronic interface power supply includes the following modules: The acquisition module 910 is used to acquire the typical active voltage support strategy of grid-connected power electronic interface power supplies; The first determining module 920 is used to determine the linearized small perturbation model of the grid-connected power electronic interface power supply based on the typical active voltage support strategy. The second determining module 930 is used to determine the target damping of the grid-connected power electronic interface power supply under the typical active voltage support strategy based on the linearized small perturbation model.

[0059] In one embodiment, the typical active voltage support strategy includes: a constant reactive power control strategy, a constant AC voltage control strategy, and an initial small disturbance model; The first determining module 920 is specifically used for: Linearization modeling is performed on the constant reactive power control strategy and the constant AC voltage control strategy respectively to obtain the linearized model of constant reactive power control corresponding to the constant reactive power control strategy and the linearized model of constant AC voltage control corresponding to the constant AC voltage control strategy. The linearized small disturbance model is determined based on the constant reactive power control linearization model, the constant AC voltage control linearization model, and the initial small disturbance model.

[0060] In one embodiment, the second determining module 930 is specifically used for: The complex torque of the grid-connected power electronic interface power supply under the typical active voltage support strategy is determined based on the linearized small perturbation model. The target damping of the grid-connected power electronic interface power supply under the typical active voltage support strategy is determined based on the complex torque.

[0061] In one embodiment, the second determining module 930 is further configured to: The damping coefficient and the sign of the target damping are determined based on the complex torque. The damping value corresponding to the target damping is determined based on the damping coefficient; The target damping is determined based on the positive or negative sign corresponding to the target damping and the damping value.

[0062] In one embodiment, the complex torque includes: constant reactive power controlled negative torque and constant AC voltage controlled negative torque; The second determining module 930 is also specifically used for: in, This represents the d-axis component of the constant reactive power control negative torque in the dq coordinate system. This represents the q-axis component of the constant reactive power control negative torque in the dq coordinate system. Indicates the grid voltage. Indicates the converter phase. This represents the q-axis current of the converter. This represents the d-axis current of the converter. This represents the d-axis current loop transfer function of the converter. This represents the q-axis current loop transfer function of the converter. This represents the proportional gain of the reactive power loop in the converter. This represents the integral coefficient of the reactive power loop of the converter. Represents the Laplace operator. represents an imaginary number, e It is a natural constant. This indicates the phase correction amount. This represents the d-axis component of the constant AC voltage controlled negative torque in the dq coordinate system. This represents the q-axis component of the constant AC voltage controlled negative torque in the dq coordinate system. This represents a small disturbance in the converter phase. Indicates the inductive reactance of the transmission line. Indicates the oscillation frequency of the offering. This represents the proportional gain of the AC voltage loop in the converter. This represents the integral coefficient of the AC voltage loop of the converter.

[0063] In one embodiment, the damping coefficient includes: a constant reactive power control damping coefficient and a constant AC voltage control damping coefficient; The second determining module 930 is also specifically used for: in, This represents the d-axis component of the constant reactive power control damping coefficient in the dq coordinate system. This represents the q-axis component of the constant reactive power control damping coefficient in the dq coordinate system. represents an imaginary number, Indicates the subsynchronous oscillation angular frequency. This represents the d-axis component of the constant AC voltage control damping coefficient in the dq coordinate system. This represents the q-axis component of the constant AC voltage control damping coefficient in the dq coordinate system.

[0064] This invention provides a damping determination device for active voltage support of grid-connected power electronic interface power supplies. The device acquires a typical active voltage support strategy for the grid-connected power electronic interface power supply; determines a linearized small perturbation model of the grid-connected power electronic interface power supply based on the typical active voltage support strategy; and determines the target damping of the grid-connected power electronic interface power supply under the typical active voltage support strategy based on the linearized small perturbation model. This invention's technical solution, by constructing a linearized small perturbation model, can quantitatively determine the target damping of the grid-connected power electronic interface power supply under a typical active voltage support strategy, making it more suitable for stability analysis of power electronic interface power supplies compared to existing technologies.

[0065] Figure 10 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 10 As shown, the electronic device may include: a processor 1010, a communications interface 1020, a memory 1030, and a communication bus 1040, wherein the processor 1010, the communications interface 1020, and the memory 1030 communicate with each other through the communication bus 1040. The processor 1010 can call logic instructions in the memory 1030 to execute a damping determination method for the active voltage support of the grid-connected power electronic interface power supply, the method including: Typical active voltage support strategies for grid-connected power electronic interface power supplies; Based on the typical active voltage support strategy, a linearized small perturbation model for the grid-connected power electronic interface power supply is determined. The target damping of the grid-connected power electronic interface power supply under the typical active voltage support strategy is determined based on the linearized small perturbation model.

[0066] Furthermore, the logical instructions in the aforementioned memory 1030 can be implemented as software functional units and, when sold or used as independent products, 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 a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in 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.

[0067] On the other hand, the present invention also provides a computer program product, the computer program product comprising a computer program that can be stored on a non-transitory computer-readable storage medium, wherein when the computer program is executed by a processor, the computer is able to execute the damping determination method for active voltage support of grid-connected power electronic interface power supply provided by the above methods, the method comprising: Typical active voltage support strategies for grid-connected power electronic interface power supplies; Based on the typical active voltage support strategy, a linearized small perturbation model for the grid-connected power electronic interface power supply is determined. The target damping of the grid-connected power electronic interface power supply under the typical active voltage support strategy is determined based on the linearized small perturbation model.

[0068] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a method for determining the damping of active voltage support for grid-connected power electronic interface power supplies provided by the methods described above, the method comprising: Typical active voltage support strategies for grid-connected power electronic interface power supplies; Based on the typical active voltage support strategy, a linearized small perturbation model for the grid-connected power electronic interface power supply is determined. The target damping of the grid-connected power electronic interface power supply under the typical active voltage support strategy is determined based on the linearized small perturbation model.

[0069] The device embodiments described above are merely illustrative. 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 modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0070] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; 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; and these 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 method for determining the damping of a net-follower power electronics interface power source active voltage support, characterized in that, The method comprises the following steps: acquiring a typical active voltage support strategy of a grid-following power electronic interface power supply; determining a linearized small disturbance model of the grid-following power electronic interface power supply based on the typical active voltage support strategy; determining a target damping of the grid-following power electronic interface power supply under the typical active voltage support strategy based on the linearized small disturbance model.

2. The method of claim 1, wherein the damping is determined by the network- type power electronic interface power source active voltage support, characterized by, The typical active voltage support strategy comprises a constant reactive power control strategy, a constant AC voltage control strategy and an initial small disturbance model; The step of determining the linearized small disturbance model of the grid-following power electronic interface power supply based on the typical active voltage support strategy comprises the following steps: linearly modeling the constant reactive power control strategy and the constant AC voltage control strategy respectively to obtain a constant reactive power control linearized model corresponding to the constant reactive power control strategy and a constant AC voltage control linearized model corresponding to the constant AC voltage control strategy; determining the linearized small disturbance model based on the constant reactive power control linearized model, the constant AC voltage control linearized model and the initial small disturbance model.

3. The method of claim 2, wherein the damping is determined by the network- type power electronic interface power source active voltage support. The step of determining the target damping of the grid-following power electronic interface power supply under the typical active voltage support strategy based on the linearized small disturbance model comprises the following steps: determining a complex torque of the grid-following power electronic interface power supply under the typical active voltage support strategy based on the linearized small disturbance model; determining the target damping of the grid-following power electronic interface power supply under the typical active voltage support strategy based on the complex torque.

4. The method of claim 3, wherein, The step of determining the target damping of the grid-following power electronic interface power supply under the typical active voltage support strategy based on the complex torque comprises the following steps: determining a damping coefficient and a positive or negative sign corresponding to the target damping based on the complex torque; determining a damping value corresponding to the target damping based on the damping coefficient; determining the target damping based on the positive or negative sign and the damping value corresponding to the target damping.

5. The method of claim 3, wherein, The complex torque comprises a constant reactive power control negative torque and a constant AC voltage control negative torque. The step of determining the complex torque of the grid-following power electronic interface power supply under the typical active voltage support strategy based on the linearized small disturbance model comprises the following steps: wherein, represents a d-axis component of the fixed reactive power control negative torque in the dq coordinate system, represents a q-axis component of the fixed reactive power control negative torque in the dq coordinate system, represents a grid voltage, represents a converter phase, represents a converter q-axis current, represents a converter d-axis current, represents a converter d-axis current loop transfer function, represents a converter q-axis current loop transfer function, represents a converter reactive power loop proportional coefficient, represents a converter reactive power loop integral coefficient, represents a Laplace operator, represents an imaginary number, e is a natural constant, represents a phase correction amount, represents a d-axis component of the fixed alternating current voltage control negative torque in the dq coordinate system, represents a q-axis component of the fixed alternating current voltage control negative torque in the dq coordinate system, represents a small disturbance of the converter phase, represents a transmission line inductance, represents a source product oscillation frequency, represents a converter alternating current voltage loop proportional coefficient, represents a converter alternating current voltage loop integral coefficient.

6. The method of claim 5, wherein the damping is determined by the network-type power electronic interface power source active voltage support. The damping coefficient comprises a constant reactive power control damping coefficient and a constant AC voltage control damping coefficient. The step of determining the damping coefficient based on the complex torque comprises the following steps: wherein represents a d-axis component of the fixed reactive power control damping coefficient in the dq coordinate system, represents a q-axis component of the fixed reactive power control damping coefficient in the dq coordinate system, represents an imaginary number, represents a subsynchronous oscillation angular frequency, represents a d-axis component of the fixed alternating current voltage control damping coefficient in the dq coordinate system, represents a q-axis component of the fixed alternating current voltage control damping coefficient in the dq coordinate system.

7. A device for determining the damping of an active voltage support of a net- follower power electronics interface power supply, characterized by The method comprises the following steps: acquiring a typical active voltage support strategy of a grid-following power electronic interface power supply; determining a linearized small disturbance model of the grid-following power electronic interface power supply based on the typical active voltage support strategy; determining a target damping of the grid-following power electronic interface power supply under the typical active voltage support strategy based on the linearized small disturbance model.

8. An electronic device comprising a memory, a processor, and a computer program stored on the memory and running on the processor, characterized in that, The processor executes the computer program to realize the damping determination method of the active voltage support of the grid-following power electronic interface power supply according to any one of claims 1 to 6. 9.A non-transitory computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to realize the damping determination method of the active voltage support of the grid-following power electronic interface power supply according to any one of claims 1 to 6.

10. A computer program product comprising a computer program, characterized in that, The computer program, when executed by a processor, implements the method for determining the damping of the active voltage support of the grid-connected power electronic interface power source according to any one of claims 1 to 6.

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