Method and device for judging small disturbance synchronization stability of power electronic interface power supply

Abstract

The embodiment of the present application provides a kind of power electronic interface power small disturbance synchronization stability judgment method and device, the method comprises: the equilibrium point parameter of calculating system verifies whether equilibrium point exists;Equilibrium point exists, and damping coefficient and synchronization coefficient are calculated based on the small disturbance synchronization stability analysis framework of power electronic interface power;According to the small disturbance frequency domain linearization model of power electronic interface power including power ring, additional complex torque coefficient is calculated;Additional damping coefficient and additional synchronization coefficient are calculated;System total damping coefficient, system total synchronization coefficient and system total complex torque coefficient are calculated;Modified damping coefficient, modified synchronization coefficient and modified complex torque coefficient are calculated;According to modified damping coefficient and modified synchronization coefficient or according to modified complex torque coefficient, the small disturbance synchronization stability of power electronic interface power is judged.The embodiment of the present application reduces the amount of calculation of synchronization stability analysis, and realizes the analysis of synchronization stability analysis.

Description

Technical Field

[0001] This invention relates to the field of power electronics technology, specifically to a method and apparatus for judging the synchronization stability of a power electronic interface power supply under small disturbances. 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. Therefore, conducting online assessments of power electronic interface power supply stability is of great significance for the safe and stable operation of the power grid under the new conditions.

[0003] Currently, the main methods for determining the synchronization stability of power electronic interface power supplies under small disturbances are eigenvalue analysis and impedance analysis. Eigenvalue analysis requires establishing detailed eigenvalue equations for the system, making modeling and analysis complex, and it is prone to the "curse of dimensionality" problem for high-order systems. Impedance analysis, based on port measurement data, cannot analyze the impact of internal control elements on system stability, thus making it difficult to reveal the synchronization stability mechanism of novel power systems under small disturbances, and hindering the improvement of system stability. Summary of the Invention

[0004] To address the shortcomings of existing technologies, embodiments of the present invention provide a method and apparatus for judging the synchronization stability of power electronic interface power supplies under small disturbances.

[0005] This invention provides a method for judging the synchronization stability of a power electronic interface power supply under small disturbances, comprising: calculating system equilibrium point parameters based on input system structure parameters and control parameters; verifying the existence of an equilibrium point based on the system equilibrium point parameters; in response to the existence of an equilibrium point, calculating the damping coefficient and synchronization coefficient of the phase-locked loop's inherent oscillation mode based on a power electronic interface power supply small disturbance synchronization stability analysis framework; calculating the angular frequency of the system's synchronous stable oscillation mode, and calculating an additional complex torque coefficient based on a power electronic interface power supply small disturbance frequency domain linearization model including a power loop; calculating an additional damping coefficient and an additional synchronization coefficient based on the system's synchronous stable oscillation mode angular frequency and the additional complex torque coefficient; wherein, the additional damping coefficient and the additional synchronization coefficient are used to measure the current loop, power loop, and... The impact of line dynamics on the system's small disturbance synchronization stability is investigated. The total system damping coefficient is calculated based on the damping coefficient and the additional damping coefficient. The total system synchronization coefficient is calculated based on the synchronization coefficient and the additional synchronization coefficient. The total system complex torque coefficient is calculated based on the total system damping coefficient, the total system synchronization coefficient, and the angular frequency of the system's synchronous stable oscillation mode. The total system damping coefficient, the total system synchronization coefficient, and the total system complex torque coefficient are corrected using the corrected complex torque coefficient method to obtain the corrected damping coefficient, the corrected synchronization coefficient, and the corrected complex torque coefficient. The small disturbance synchronization stability of the power electronic interface power supply is judged based on the corrected damping coefficient and the corrected synchronization coefficient, or the small disturbance synchronization stability of the power electronic interface power supply is judged based on the corrected complex torque coefficient.

[0006] According to an embodiment of the present invention, a method for judging the synchronization stability of a power electronic interface power supply under small disturbances is provided. The step of judging the synchronization stability of a power electronic interface power supply under small disturbances based on the modified damping coefficient and the modified synchronization coefficient includes: if both the modified damping coefficient and the modified synchronization coefficient are positive, the system is stable under small disturbances; otherwise, the system is unstable under small disturbances.

[0007] According to an embodiment of the present invention, a method for judging the synchronization stability of a power electronic interface power supply under small disturbances is provided. The step of judging the synchronization stability of the power electronic interface power supply under small disturbances based on the modified complex torque coefficient includes: in response to the phase of the modified complex torque coefficient being in [0, 90°], the system under small disturbances is stable; otherwise, the system under small disturbances is unstable.

[0008] According to an embodiment of the present invention, a method for judging the synchronization stability of a power electronic interface power supply under small disturbances is provided, wherein the damping coefficient is expressed as:

[0009]

[0010] Among them, K D X represents the damping coefficient of the phase-locked loop's inherent oscillation mode.l I represents the transmission line reactance, ω0 represents the system angular frequency constant, and I d0 This indicates the current balance point value of the converter's d-axis;

[0011] The synchronization coefficient is expressed as:

[0012] K S =U g cosθ pll0 ,

[0013] Among them, K S U represents the synchronization coefficient of the inherent oscillation mode of the phase-locked loop. g Represents the grid voltage, θ pll0 This indicates the phase balance point value of the phase-locked loop.

[0014] According to an embodiment of the present invention, a method for judging the synchronization stability of a power electronic interface power supply under small disturbances is provided, wherein the additional complex torque coefficient is expressed as:

[0015]

[0016]

[0017] Among them, H f U represents the additional complex torque coefficient. g Represents the grid voltage, θ pll0 I represents the phase equilibrium point value of the phase-locked loop. d0 I represents the d-axis current balance point value of the converter. q0 R represents the q-axis current balance point value of the converter. l X represents the resistance of the transmission line. g Let represent the total reactance of the line from the converter terminal to the infinite grid, s represent the differential operator in the Laplace domain, ω0 represent the system angular frequency constant, and k represent the total reactance of the line from the converter terminal to the infinite grid. p1 k represents the proportional parameter of the outer loop PI control for the active power of the converter. i1 k represents the integral parameter of the outer loop PI control for the active power of the converter. p3 k represents the proportional parameter of the outer loop PI control for reactive power of the converter. i3 This represents the integral parameter of the outer loop PI control for the reactive power of the converter.

[0018]

[0019] Where, k pcc k represents the proportional parameter of the PI control loop in the converter current control system. icc This represents the integral parameter of the PI control loop in the converter current control system.

[0020] According to an embodiment of the present invention, a method for judging the synchronization stability of a power electronic interface power supply under small disturbances is provided, wherein the total damping coefficient of the system is expressed as:

[0021] M D =K D +m D ,

[0022] Among them, M D K represents the total damping coefficient of the system. D The damping coefficient, m D This represents the additional damping coefficient;

[0023] The overall synchronization coefficient of the system is expressed as:

[0024] M S =K S +m S ,

[0025] Among them, M S K represents the total synchronization coefficient of the system. S Let m represent the synchronization coefficient. S This represents the additional synchronization coefficient;

[0026] The total complex torque coefficient of the system is expressed as follows:

[0027] H = M S +jω d M D ,

[0028] Where H represents the total complex torque coefficient of the system, ω d This represents the angular frequency of the synchronous stable oscillation mode of the system.

[0029] This invention also provides a device for judging the synchronization stability of a power electronic interface power supply under small disturbances, comprising: a verification module, configured to: calculate system equilibrium point parameters based on input system structure parameters and control parameters, and verify the existence of an equilibrium point based on the system equilibrium point parameters; a first calculation module, configured to: calculate the damping coefficient and synchronization coefficient of the inherent oscillation mode of the phase-locked loop based on the power electronic interface power supply under small disturbance synchronization stability analysis framework in response to the existence of the equilibrium point; a second calculation module, configured to: calculate the angular frequency of the system's synchronous stable oscillation mode, and calculate the additional complex torque coefficient based on the power electronic interface power supply under small disturbance frequency domain linearization model including the power loop; and a third calculation module, configured to: calculate the additional damping coefficient and the additional synchronization coefficient based on the angular frequency of the system's synchronous stable oscillation mode and the additional complex torque coefficient; wherein the additional damping coefficient and the additional synchronization coefficient are used to measure the current. The system is assessed for the impact of loop, power loop, and line dynamic processes on the synchronization stability of the system under small disturbances. A fourth calculation module is used to: calculate the total system damping coefficient based on the damping coefficient and the additional damping coefficient; calculate the total system synchronization coefficient based on the synchronization coefficient and the additional synchronization coefficient; and calculate the total system complex torque coefficient based on the total system damping coefficient, the total system synchronization coefficient, and the angular frequency of the system's synchronous stable oscillation mode. A correction module is used to: correct the total system damping coefficient, the total system synchronization coefficient, and the total system complex torque coefficient using the corrected complex torque coefficient method, respectively, to obtain the corrected damping coefficient, the corrected synchronization coefficient, and the corrected complex torque coefficient. A stability judgment module is used to: judge the synchronization stability of the power electronic interface power supply under small disturbances based on the corrected damping coefficient and the corrected synchronization coefficient, or judge the synchronization stability of the power electronic interface power supply under small disturbances based on the corrected complex torque coefficient.

[0030] This invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the steps of the power electronic interface power supply small disturbance synchronization stability judgment method as described above.

[0031] This invention also provides a non-transitory computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the power electronic interface power supply small disturbance synchronization stability judgment method as described above.

[0032] This invention also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of any of the above-described power electronic interface power supply small disturbance synchronization stability judgment methods.

[0033] The method and apparatus for judging the synchronization stability of power electronic interface power supplies under small disturbances provided in this invention analyze the overall control links of power electronic equipment and simplify the analysis process based on the modified complex torque coefficient method, resulting in a new method for judging the synchronization stability of power electronic interface power supplies under small disturbances. This is of great significance for revealing the stability mechanism of new power systems, realizing online monitoring of system stability, and improving the safe and stable operation capability of the system. Furthermore, the method considers the influence of the power loop on system stability in judging the synchronization stability of power electronic interface power supplies under small disturbances, which better reflects the operating characteristics of actual power electronic systems, thereby realizing the analytical approach to synchronization stability analysis. Attached Figure Description

[0034] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is one of the flowcharts illustrating the method for judging the synchronization stability of power electronic interface power supplies under small disturbances provided in this embodiment of the invention;

[0036] Figure 2 This is a schematic diagram of the power electronic interface power supply small disturbance synchronization stability judgment method provided in the embodiment of the present invention, which retains the phase-locked loop for power electronic interface power supply small disturbance synchronization stability analysis framework;

[0037] Figure 3 This is a schematic diagram of the structure of the power electronic interface power supply small disturbance frequency domain linearization model, which includes the power loop, in the power electronic interface power supply small disturbance synchronization stability judgment method provided in the embodiments of the present invention.

[0038] Figure 4 This is the second flowchart of the method for judging the synchronization stability of power electronic interface power supply under small disturbances provided in the embodiments of the present invention;

[0039] Figure 5 This is the third flowchart of the method for judging the synchronization stability of power electronic interface power supply under small disturbances provided in the embodiments of the present invention;

[0040] Figure 6 This is a schematic diagram illustrating a computational example of the power electronic interface power supply small disturbance synchronization stability judgment method provided in this embodiment of the invention;

[0041] Figure 7 This is a schematic diagram of the power electronic interface power supply small disturbance synchronization stability judgment device provided in an embodiment of the present invention;

[0042] Figure 8 This is a schematic diagram of the structure of the electronic device provided in an embodiment of the present invention. Detailed Implementation

[0043] 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.

[0044] Figure 1 This is one of the flowcharts illustrating the method for judging the synchronization stability of a power electronic interface power supply under small disturbances provided in this embodiment of the invention. For example... Figure 1 As shown, the method includes:

[0045] Step S1: Calculate the system equilibrium point parameters based on the input system structure parameters and control parameters, and verify the existence of the equilibrium point based on the system equilibrium point parameters.

[0046] Based on the input system structure parameters and control parameters, the system equilibrium point parameters are calculated. Among these, the system structure parameters include the transmission line reactance X. l Total reactance X of the line from the converter terminal to the infinite power grid g Transmission line resistance R l and converter filter resistor R f The control parameters include the converter active power command value P. ref The reactive power command value Q of the converter ref and PI parameters. System equilibrium point parameters include the phase-locked loop phase equilibrium point value θ. pll0 The current balance point value I of the converter d-axis d0 and the converter q-axis current balance point value I q0 .

[0047] Verify the existence of the equilibrium point based on the system equilibrium point parameters. The existence of the equilibrium point indicates that the system is operating normally. Since stability assessment requires the system to be operating normally, if the equilibrium point exists, further assessment of system stability is performed. If the equilibrium point does not exist, it indicates that the system is not currently operating normally, and information on small disturbance instability can be directly output.

[0048] Step S2: In response to the existence of the equilibrium point, calculate the damping coefficient and synchronization coefficient of the phase-locked loop's inherent oscillation mode based on the power electronic interface power supply small disturbance synchronization stability analysis framework.

[0049] If an equilibrium point exists, it indicates that the system is in normal operating condition. Therefore, a small-disturbance synchronization stability assessment of the power electronic interface power supply is performed. First, based on the power electronic interface power supply small-disturbance synchronization stability analysis framework, the damping coefficient and synchronization coefficient of the phase-locked loop's inherent oscillation mode are calculated.

[0050] The system control components include a phase-locked loop (PLL), a current control loop, a power control loop, and the dynamic processes of the transmission lines. The system's synchronization stability is primarily determined by the PLL state variable θ. pll and x pll Dominant. θ pll Indicates the phase equilibrium point value of the phase-locked loop, x pll This represents the integral variable of the PI element in the phase-locked loop (PLL). Simulation examples show that, compared to the PLL, the current loop and the circuit's dynamic dominant oscillation mode have higher oscillation frequencies and decay faster. Therefore, when studying synchronization stability issues related to the PLL, their rapid process can be considered to have reached a steady state. The power control loop's dominant oscillation mode has a lower oscillation frequency; therefore, when studying synchronization stability issues related to the PLL, its state can be considered unchanged.

[0051] Based on this, the current loop, power loop, and line dynamic processes are characterized by synchronization coefficients and damping coefficients, and these are superimposed onto the phase-locked loop (PLL) as feedback quantities, thus obtaining a small-disturbance synchronization stability analysis framework for power electronic interface power supplies that retains the PLL. This small-disturbance synchronization stability analysis framework for power electronic interface power supplies (an equivalent analysis framework considering the power loop) is derived from a frequency-domain linearized model of small-disturbance power supplies that includes the power loop (a frequency-domain small-signal model of a constant-power control strategy), and is used for stability analysis.

[0052] Figure 2 This is a schematic diagram of the power electronic interface power supply small disturbance synchronization stability judgment method provided in the embodiment of the present invention, which retains the phase-locked loop for power electronic interface power supply small disturbance synchronization stability analysis framework. Figure 2 It can also be called a small-disturbance synchronization stability analysis framework for power electronic interface power supplies based on the phase-locked loop method obtained by the complex torque coefficient method.

[0053] Figure 2 In, Δθ pll ΔU represents the phase disturbance of the phase-locked loop. q Δω represents the q-axis component disturbance of the converter grid connection point voltage. pll This represents the angular frequency disturbance of the phase-locked loop.

[0054] Step S3: Calculate the angular frequency of the system's synchronous stable oscillation mode, and calculate the additional complex torque coefficient based on the power electronic interface power supply small disturbance frequency domain linearization model containing the power loop.

[0055] When analyzing the synchronous stability under small disturbances, the angular frequency ω of the system's synchronous stable oscillation mode is...d Mainly composed of phase-locked loop state variables θ pll and x pll The primary method is to estimate the frequency using the natural oscillation frequency of the phase-locked loop (PLL). The estimation formula is as follows:

[0056]

[0057] Where, k i5 U represents the proportional parameter of the PI control in the phase-locked loop of the converter. g Represents the grid voltage, θ pll0 This represents the phase equilibrium point value of the phase-locked loop, ω0 represents the system angular frequency constant, typically taken as 100π, and k p5 X represents the integral parameter of the converter phase-locked loop PI control. l I represents the reactance of the transmission line. d0 This indicates the current balance point value of the converter's d-axis.

[0058] Furthermore, the additional complex torque coefficient is calculated based on the frequency domain linearization model of the power electronic interface power supply with small disturbances, which includes the power loop.

[0059] Figure 3 This is a schematic diagram of the structure of the power electronic interface power supply small disturbance frequency domain linearization model, which includes a power loop, in the power electronic interface power supply small disturbance synchronization stability judgment method provided in this embodiment of the invention. Based on linearization theory, the power electronic interface power supply small disturbance frequency domain linearization model including a power loop is established by modifying the complex torque coefficient method. Figure 3 The frequency domain linearization model of the power electronic interface power supply with power loop shown can be obtained based on the typical grid-connected device of the power electronic interface power supply—the voltage source grid-connected converter.

[0060] Step S4: Calculate the additional damping coefficient and the additional synchronization coefficient based on the angular frequency of the system's synchronous stable oscillation mode and the additional complex torque coefficient; wherein, the additional damping coefficient and the additional synchronization coefficient are used to measure the influence of the current loop, power loop and line dynamic process on the system's small disturbance synchronization stability.

[0061] The additional complex torque coefficient is expressed as:

[0062] H f (jω d )=m S +jω d m D ,

[0063] Among them, H f (jω d ) represents the additional complex torque coefficient, m S Indicates the additional synchronization coefficient, m D ω represents the additional damping coefficient. dThis represents the angular frequency of the system's synchronous and stable oscillation mode.

[0064] Therefore, the additional synchronization coefficient m S ω is the real part of the additional complex torque coefficient. d m D This represents the imaginary part of the additional complex torque coefficient. Given the calculated angular frequency of the system's synchronous stable oscillation mode and the additional complex torque coefficient, the additional damping coefficient and the additional synchronization coefficient can be determined.

[0065] Step S5: Calculate the total damping coefficient of the system based on the damping coefficient and the additional damping coefficient; calculate the total synchronization coefficient of the system based on the synchronization coefficient and the additional synchronization coefficient; and calculate the total complex torque coefficient of the system based on the total damping coefficient, the total synchronization coefficient, and the angular frequency of the system's synchronous stable oscillation mode.

[0066] The total damping coefficient of the system is determined by the damping coefficient and the additional damping coefficient. The total synchronization coefficient of the system is determined by the synchronization coefficient and the additional synchronization coefficient. Based on the relationship between the complex torque coefficient, the synchronization coefficient and the damping coefficient, the total complex torque coefficient of the system is calculated from the total damping coefficient, the total synchronization coefficient and the angular frequency of the system's synchronous stable oscillation mode.

[0067] Step S6: Correct the total damping coefficient, the total synchronization coefficient, and the total complex torque coefficient of the system respectively by using the corrected complex torque coefficient method to obtain the corrected damping coefficient, the corrected synchronization coefficient, and the corrected complex torque coefficient.

[0068] Based on the modified complex torque coefficient method, the influence of different control links on system damping is equivalent to the modified synchronization coefficient and the modified damping coefficient, and the synchronization stability of small disturbances is judged.

[0069] Power electronic interface power supplies do not have rotating mass blocks; grid synchronization is achieved using phase-locked loop control. The proportional term k... p5 The existence of these factors means that the system damping is affected not only by the damping coefficient but also by the synchronization coefficient, creating a more complex and coupled effect. Therefore, the total system damping coefficient, total system synchronization coefficient, and total system complex torque coefficient need to be corrected using the modified complex torque coefficient analysis method, as shown in the following equation.

[0070]

[0071] Where H′ represents the corrected complex torque coefficient, and H represents the total complex torque coefficient of the system. ω d k represents the angular frequency of the system's synchronous stable oscillation mode. p5 k represents the integral parameter of the PI control of the phase-locked loop of the converter. i5 M′ represents the proportional parameter of the PI control in the phase-locked loop of the converter. SM represents the correction synchronization coefficient. S Let k5 represent the total synchronization coefficient of the system, and k5 represent the phase-locked loop parameters, satisfying the following conditions: M D M′ represents the total damping coefficient of the system. D This indicates the corrected damping coefficient.

[0072] Step S7: Determine the synchronization stability of the power electronic interface power supply under small disturbances based on the modified damping coefficient and the modified synchronization coefficient, or determine the synchronization stability of the power electronic interface power supply under small disturbances based on the modified complex torque coefficient.

[0073] The synchronization stability of a power electronic interface power supply under small disturbances can be judged based on the modified damping coefficient and the modified synchronization coefficient, or based on the modified complex torque coefficient. The two judgments are equivalent.

[0074] The method for judging the synchronization stability of power electronic interface power supplies under small disturbances provided in this invention analyzes the control links of power electronic equipment as a whole. Based on the modified complex torque coefficient method, the analysis process is simplified, resulting in a new method for judging the synchronization stability of power electronic interface power supplies under small disturbances. This method is of great significance for revealing the stability mechanism of new power systems, realizing online monitoring of system stability, and improving the safe and stable operation capability of the system. Furthermore, the method considers the influence of the power loop on system stability in judging the synchronization stability of power electronic interface power supplies under small disturbances, which better reflects the operating characteristics of actual power electronic systems, thereby realizing the analytical approach to synchronization stability analysis.

[0075] According to an embodiment of the present invention, a method for judging the synchronization stability of a power electronic interface power supply under small disturbances is provided. The step of judging the synchronization stability of a power electronic interface power supply under small disturbances based on the modified damping coefficient and the modified synchronization coefficient includes: if both the modified damping coefficient and the modified synchronization coefficient are positive, the system is stable under small disturbances; otherwise, the system is unstable under small disturbances.

[0076] When judging the small disturbance synchronization stability of the power electronic interface power supply based on the modified damping coefficient and the modified synchronization coefficient, if both the modified damping coefficient and the modified synchronization coefficient are positive, the system is stable under small disturbances; otherwise, the system is unstable under small disturbances.

[0077] The power electronic interface power supply small disturbance synchronization stability judgment method provided in this embodiment of the invention achieves rapid judgment of the power electronic interface power supply small disturbance synchronization stability by responding to both the modified damping coefficient and the modified synchronization coefficient being positive, indicating that the system is stable during small disturbances; otherwise, the system is unstable during small disturbances.

[0078] According to an embodiment of the present invention, a method for judging the synchronization stability of a power electronic interface power supply under small disturbances is provided. The step of judging the synchronization stability of the power electronic interface power supply under small disturbances based on the modified complex torque coefficient includes: in response to the phase of the modified complex torque coefficient being in [0, 90°], the system under small disturbances is stable; otherwise, the system under small disturbances is unstable.

[0079] When judging the small disturbance synchronization stability of a power electronic interface power supply based on the modified complex torque coefficient, if the modified complex torque coefficient satisfies ∠(H′)∈[0,90°], the system is stable under small disturbances; otherwise, the system is unstable under small disturbances. ∠(H′) represents the phase of H′.

[0080] The power electronic interface power supply small disturbance synchronization stability judgment method provided in this embodiment of the invention achieves rapid judgment of the power electronic interface power supply small disturbance synchronization stability by responding to the phase of the modified complex torque coefficient being in [0, 90°], indicating that the system is stable during small disturbances; otherwise, the system is unstable during small disturbances.

[0081] According to an embodiment of the present invention, a method for judging the synchronization stability of a power electronic interface power supply under small disturbances is provided, wherein the damping coefficient is expressed as:

[0082]

[0083] Among them, K D X represents the damping coefficient of the phase-locked loop's inherent oscillation mode. l I represents the transmission line reactance, ω0 represents the system angular frequency constant, and I represents the transmission line reactance. d0 This indicates the current balance point value of the converter's d-axis;

[0084] The synchronization coefficient is expressed as:

[0085] K S =U g cosθ pll0 ,

[0086] Among them, K S U represents the synchronization coefficient of the inherent oscillation mode of the phase-locked loop. g Represents the grid voltage, θ pll0 This indicates the phase balance point value of the phase-locked loop.

[0087] The power electronic interface power supply small disturbance synchronization stability judgment method provided in this embodiment of the invention realizes the acquisition of the damping coefficient and synchronization coefficient of the phase-locked loop's inherent oscillation mode.

[0088] According to the power electronic interface power supply small disturbance synchronization stability judgment method provided in the embodiment of the present invention, the additional complex torque coefficient is expressed as:

[0089]

[0090]

[0091] Among them, H f U represents the additional complex torque coefficient. g Represents the grid voltage, θ pll0 I represents the phase equilibrium point value of the phase-locked loop. d0 I represents the d-axis current balance point value of the converter. q0 R represents the q-axis current balance point value of the converter. l X represents the resistance of the transmission line. g Let represent the total reactance of the line from the converter terminal to the infinite grid, s represent the differential operator in the Laplace domain, ω0 represent the system angular frequency constant, and k represent the total reactance of the line from the converter terminal to the infinite grid. p1 k represents the proportional parameter of the outer loop PI control for the active power of the converter. i1 k represents the integral parameter of the outer loop PI control for the active power of the converter. p3 k represents the proportional parameter of the outer loop PI control for reactive power of the converter. i3 This represents the integral parameter of the outer loop PI control for the reactive power of the converter.

[0092]

[0093] Where, k pcc k represents the proportional parameter of the PI control loop in the converter current control system. icc This represents the integral parameter of the PI control loop in the converter current control system.

[0094] The method for judging the synchronization stability of small disturbances in power electronic interface power supplies provided in this invention realizes the calculation of additional complex torque coefficients based on the frequency domain linearization model of small disturbances in power electronic interface power supplies containing a power loop.

[0095] According to an embodiment of the present invention, a method for judging the synchronization stability of a power electronic interface power supply under small disturbances is provided, wherein the total damping coefficient of the system is expressed as:

[0096] M D =K D +m D ,

[0097] Among them, M D K represents the total damping coefficient of the system. D The damping coefficient, m D This represents the additional damping coefficient;

[0098] The overall synchronization coefficient of the system is expressed as:

[0099] M S =K S +m S ,

[0100] Among them, M S K represents the total synchronization coefficient of the system. S Let m represent the synchronization coefficient. S This represents the additional synchronization coefficient;

[0101] The total complex torque coefficient of the system is expressed as follows:

[0102] H = M S +jω d M D ,

[0103] Where H represents the total complex torque coefficient of the system, ω d This represents the angular frequency of the synchronous stable oscillation mode of the system.

[0104] The power electronic interface power supply small disturbance synchronization stability judgment method provided in this embodiment of the invention realizes the acquisition of the system total damping coefficient, the system total synchronization coefficient and the system total complex torque coefficient.

[0105] Figure 4 This is the second flowchart illustrating the method for judging the synchronization stability of a power electronic interface power supply under small disturbances provided in this embodiment of the invention. Figure 4 As shown, the method includes:

[0106] Begin small-perturbation stability analysis;

[0107] Input system structural parameters and control parameters; among which, the system structural parameters include transmission line reactance X. l Total reactance X of the line from the converter terminal to the infinite power grid g Transmission line resistance R l and converter filter resistor R f The control parameters include the converter active power command value P. ref The reactive power command value Q of the converter ref and PI parameters;

[0108] The system equilibrium point parameters, including the phase-locked loop phase equilibrium point value θ, are calculated based on the input system structure parameters and control parameters. pll0 The current balance point value I of the converter d-axis d0 and the converter q-axis current balance point value I q0 ;

[0109] Verify the existence of the equilibrium point based on the system equilibrium point parameters. If the equilibrium point does not exist, it indicates that the system is not in normal operating condition, and output information about small disturbance instability. If the equilibrium point exists, calculate the angular frequency ω of the system's synchronous stable oscillation mode. d ω d It can also be called the angular frequency of the system's dominant oscillation mode;

[0110] Calculate the corrected complex torque coefficient H′ and the corrected damping coefficient M′. D and the corrected synchronization coefficient M′ S If M′ D >0 and M′ S If M′ > 0, or ∠(H′) ∈ [0, 90°], then the small perturbation is stable. D >0 and M′ S If >0 is not true, or ∠(H′)∈[0,90°] is not true, then the small perturbation will cause instability.

[0111] Figure 5 This is the third flowchart illustrating the method for judging the synchronization stability of a power electronic interface power supply under small disturbances provided in this embodiment of the invention. Figure 5 As shown, the method includes:

[0112] Step 101: Obtain the physical quantity data of the system's operating equilibrium point to obtain the values ​​of each variable in the small disturbance synchronization stability analysis framework.

[0113] Step 102: Obtain the power control circuit setting parameters of the power electronic interface.

[0114] Step 103: Check if the system has an operating point (equilibrium point).

[0115] Step 104: Calculate the complex torque coefficient and the angular frequency of the system's synchronous stable oscillation mode using a simulation platform.

[0116] Step 105: Calculate the corrected damping coefficient, corrected synchronization coefficient, and corrected complex torque coefficient;

[0117] Step 106: Determine the synchronization stability of small disturbances based on the modified damping coefficient and the modified synchronization coefficient, or determine the synchronization stability of small disturbances based on the phase of the modified complex torque coefficient.

[0118] The online method for judging the small disturbance synchronization stability of power electronic interface power supplies considering the power loop provided in this invention is used to judge the small disturbance synchronization stability of power electronic power systems, improve the stability characteristics of the power grid, and greatly simplify the calculation of stability judgment.

[0119] Figure 6 This is a schematic diagram illustrating a computational example verification of the power electronic interface power supply small disturbance synchronization stability judgment method provided in this embodiment of the invention. For the studied computational example, under the condition of changing active power reference value, the results obtained based on the judgment method and eigenvalue analysis method proposed in this embodiment of the invention are compared as follows: Figure 6As shown in the figure. The method for judging the small disturbance synchronization stability of a power electronic interface power supply considering the power loop proposed in this embodiment of the invention has a certain degree of conservatism, and the judgment results are reliable. Since this embodiment of the invention can judge the small disturbance synchronization stability based only on system parameters and operating point data, it is no longer necessary to establish a separate model differential equation model, which greatly simplifies the amount of calculation. At the same time, since this embodiment of the invention realizes system stability analysis based on the influence of the internal control links of the system on system stability, it can clarify the problem when the system is unstable, solve the problem, and thus improve the stability of the power grid.

[0120] It should be noted that the preferred embodiments given in this example can be freely combined, provided that there is no logical or structural conflict between them, and the present invention does not limit them.

[0121] The following describes the power electronic interface power supply small disturbance synchronization stability judgment device provided in the embodiments of the present invention. The power electronic interface power supply small disturbance synchronization stability judgment device described below can be referred to in correspondence with the power electronic interface power supply small disturbance synchronization stability judgment method described above.

[0122] Figure 7 This is a schematic diagram of the power electronic interface power supply small disturbance synchronization stability judgment device provided in an embodiment of the present invention. Figure 7 As shown, the device includes a verification module 10, a first calculation module 20, a second calculation module 30, a third calculation module 40, a fourth calculation module 50, a correction module 60, and a stability determination module 70, wherein:

[0123] Verification module 10 is used to: calculate the system equilibrium point parameters based on the input system structure parameters and control parameters, and verify the existence of the equilibrium point based on the system equilibrium point parameters;

[0124] The first calculation module 20 is used to: in response to the existence of the equilibrium point, calculate the damping coefficient and synchronization coefficient of the phase-locked loop's inherent oscillation mode based on the power electronic interface power supply small disturbance synchronization stability analysis framework;

[0125] The second calculation module 30 is used to: calculate the angular frequency of the system's synchronous stable oscillation mode, and calculate the additional complex torque coefficient based on the power electronic interface power supply small disturbance frequency domain linearization model containing the power loop;

[0126] The third calculation module 40 is used to: calculate the additional damping coefficient and the additional synchronization coefficient based on the angular frequency of the system's synchronous stable oscillation mode and the additional complex torque coefficient; wherein, the additional damping coefficient and the additional synchronization coefficient are used to measure the influence of the current loop, power loop and line dynamic process on the system's small disturbance synchronous stability;

[0127] The fourth calculation module 50 is used to: calculate the total damping coefficient of the system based on the damping coefficient and the additional damping coefficient; calculate the total synchronization coefficient of the system based on the synchronization coefficient and the additional synchronization coefficient; and calculate the total complex torque coefficient of the system based on the total damping coefficient, the total synchronization coefficient of the system, and the angular frequency of the system's synchronous stable oscillation mode.

[0128] The correction module 60 is used to: correct the total damping coefficient, the total synchronization coefficient, and the total complex torque coefficient of the system respectively by means of the correction complex torque coefficient method, so as to obtain the correction damping coefficient, the correction synchronization coefficient, and the correction complex torque coefficient;

[0129] The stability judgment module 70 is used to: judge the synchronization stability of the power electronic interface power supply under small disturbances based on the modified damping coefficient and the modified synchronization coefficient, or judge the synchronization stability of the power electronic interface power supply under small disturbances based on the modified complex torque coefficient.

[0130] The power electronic interface power supply small disturbance synchronization stability judgment device provided in this invention analyzes the overall control links of the power electronic equipment and simplifies the analysis process based on the modified complex torque coefficient method, resulting in a new method for judging the synchronization stability of power electronic interface power supplies with small disturbances. This is of great significance for revealing the stability mechanism of new power systems, realizing online monitoring of system stability, and improving the safe and stable operation capability of the system. Furthermore, the power loop's influence on system stability is considered in the judgment of the synchronization stability of power electronic interface power supplies with small disturbances, which better reflects the operating characteristics of actual power electronic systems, thereby realizing the analytical analysis of synchronization stability.

[0131] Figure 8 This is a schematic diagram of the structure of the electronic device provided in the embodiment of the present invention, such as... Figure 8As shown, the electronic device may include: a processor 810, a communication interface 820, a memory 830, and a communication bus 840, wherein the processor 810, the communication interface 820, and the memory 830 communicate with each other through the communication bus 840. The processor 810 can call logic instructions in the memory 830 to execute a power electronic interface power supply small disturbance synchronization stability judgment method. This method includes: calculating system equilibrium point parameters based on input system structure parameters and control parameters; verifying the existence of an equilibrium point based on the system equilibrium point parameters; in response to the existence of an equilibrium point, calculating the damping coefficient and synchronization coefficient of the phase-locked loop's inherent oscillation mode based on the power electronic interface power supply small disturbance synchronization stability analysis framework; calculating the angular frequency of the system's synchronous stable oscillation mode, and calculating an additional complex torque coefficient based on the power electronic interface power supply small disturbance frequency domain linearization model including the power loop; calculating an additional damping coefficient and an additional synchronization coefficient based on the system's synchronous stable oscillation mode angular frequency and the additional complex torque coefficient; wherein the additional damping coefficient and the additional synchronization coefficient are used for... The impact of current loop, power loop, and line dynamic processes on the system's small disturbance synchronization stability is investigated. The total system damping coefficient is calculated based on the damping coefficient and the additional damping coefficient. The total system synchronization coefficient is calculated based on the synchronization coefficient and the additional synchronization coefficient. The total system complex torque coefficient is calculated based on the total system damping coefficient, the total system synchronization coefficient, and the angular frequency of the system's synchronous stable oscillation mode. The total system damping coefficient, the total system synchronization coefficient, and the total system complex torque coefficient are corrected using the corrected complex torque coefficient method to obtain the corrected damping coefficient, the corrected synchronization coefficient, and the corrected complex torque coefficient. The small disturbance synchronization stability of the power electronic interface power supply is judged based on the corrected damping coefficient and the corrected synchronization coefficient, or the small disturbance synchronization stability of the power electronic interface power supply is judged based on the corrected complex torque coefficient.

[0132] Furthermore, the logical instructions in the aforementioned memory 830 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, essentially, 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.

[0133] On the other hand, embodiments of the present invention also provide a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the power electronic interface power supply small disturbance synchronization stability judgment method provided by the above methods. The method includes: calculating system equilibrium point parameters based on input system structure parameters and control parameters; verifying the existence of an equilibrium point based on the system equilibrium point parameters; in response to the existence of an equilibrium point, calculating the damping coefficient and synchronization coefficient of the phase-locked loop's inherent oscillation mode based on the power electronic interface power supply small disturbance synchronization stability analysis framework; calculating the angular frequency of the system's synchronous stable oscillation mode, and calculating the additional complex torque coefficient based on the power electronic interface power supply small disturbance frequency domain linearization model including the power loop; calculating the additional complex torque coefficient based on the system's synchronous stable oscillation mode angular frequency and the additional complex torque coefficient. Damping coefficient and additional synchronization coefficient; wherein, the additional damping coefficient and the additional synchronization coefficient are used to measure the impact of current loop, power loop and line dynamic process on the system's small disturbance synchronization stability; the system's total damping coefficient is calculated based on the damping coefficient and the additional damping coefficient, the system's total synchronization coefficient is calculated based on the synchronization coefficient and the additional synchronization coefficient, and the system's total complex torque coefficient is calculated based on the system's total damping coefficient, the system's total synchronization coefficient and the system's synchronous stable oscillation mode angular frequency; the system's total damping coefficient, the system's total synchronization coefficient and the system's total complex torque coefficient are corrected respectively by the corrected complex torque coefficient method to obtain the corrected damping coefficient, the corrected synchronization coefficient and the corrected complex torque coefficient; the power electronic interface power supply's small disturbance synchronization stability is judged based on the corrected damping coefficient and the corrected synchronization coefficient, or the power electronic interface power supply's small disturbance synchronization stability is judged based on the corrected complex torque coefficient.

[0134] In another aspect, embodiments of the present invention also provide a non-transitory computer-readable storage medium storing a computer program thereon. When executed by a processor, this computer program implements the power electronic interface power supply small disturbance synchronization stability judgment method provided by the above-described methods. This method includes: calculating system equilibrium point parameters based on input system structure parameters and control parameters; verifying the existence of an equilibrium point based on the system equilibrium point parameters; responding to the existence of an equilibrium point, calculating the damping coefficient and synchronization coefficient of the phase-locked loop's inherent oscillation mode based on a power electronic interface power supply small disturbance synchronization stability analysis framework; calculating the angular frequency of the system's synchronous stable oscillation mode, and calculating an additional complex torque coefficient based on a power electronic interface power supply small disturbance frequency domain linearization model including a power loop; calculating an additional damping coefficient and an additional synchronization coefficient based on the system's synchronous stable oscillation mode angular frequency and the additional complex torque coefficient; wherein... The additional damping coefficient and the additional synchronization coefficient are used to measure the impact of the current loop, power loop, and line dynamic processes on the system's small disturbance synchronization stability. The system's total damping coefficient is calculated based on the damping coefficient and the additional damping coefficient. The system's total synchronization coefficient is calculated based on the synchronization coefficient and the additional synchronization coefficient. The system's total complex torque coefficient is calculated based on the system's total damping coefficient, the system's total synchronization coefficient, and the system's synchronous stable oscillation mode angular frequency. The system's total damping coefficient, the system's total synchronization coefficient, and the system's total complex torque coefficient are corrected using the corrected complex torque coefficient method to obtain the corrected damping coefficient, the corrected synchronization coefficient, and the corrected complex torque coefficient. The power electronic interface power supply's small disturbance synchronization stability is judged based on the corrected damping coefficient and the corrected synchronization coefficient, or the power electronic interface power supply's small disturbance synchronization stability is judged based on the corrected complex torque coefficient.

[0135] 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.

[0136] 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.

[0137] 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 judging the synchronization stability of a power electronic interface power supply under small disturbances, characterized in that, include: Based on the input system structure parameters and control parameters, the system equilibrium point parameters are calculated, and the existence of the equilibrium point is verified based on the system equilibrium point parameters. In response to the existence of the equilibrium point, the damping coefficient and synchronization coefficient of the phase-locked loop's inherent oscillation mode are calculated based on the power electronic interface power supply small disturbance synchronization stability analysis framework. The angular frequency of the synchronous stable oscillation mode of the system is calculated, and the additional complex torque coefficient is calculated based on the frequency domain linearization model of the power electronic interface power supply with power loop. The additional damping coefficient and the additional synchronization coefficient are calculated based on the angular frequency of the system's synchronous stable oscillation mode and the additional complex torque coefficient; wherein, the additional damping coefficient and the additional synchronization coefficient are used to measure the impact of the current loop, power loop and line dynamic process on the system's small disturbance synchronous stability; The total damping coefficient of the system is calculated based on the damping coefficient and the additional damping coefficient. The total synchronization coefficient of the system is calculated based on the synchronization coefficient and the additional synchronization coefficient. The total complex torque coefficient of the system is calculated based on the total damping coefficient, the total synchronization coefficient, and the angular frequency of the system's synchronous stable oscillation mode. The total damping coefficient, total synchronization coefficient, and total complex torque coefficient of the system are corrected by the modified complex torque coefficient method to obtain the modified damping coefficient, modified synchronization coefficient, and modified complex torque coefficient. The power electronic interface power supply small disturbance synchronization stability is judged based on the modified damping coefficient and the modified synchronization coefficient, or the power electronic interface power supply small disturbance synchronization stability is judged based on the modified complex torque coefficient. The additional complex torque coefficient is expressed as: ， ， in, This represents the additional complex torque coefficient. Indicates the grid voltage. This indicates the phase equilibrium point value of the phase-locked loop. This indicates the d-axis current balance point value of the converter. This indicates the q-axis current balance point value of the converter. Indicates the resistance of the transmission line. This represents the total reactance of the line from the converter terminal to the infinite power grid. Describes the differential operator in the Lagrangian field. Represents the system's angular frequency constant. This represents the proportional parameter of the outer loop PI control for the active power of the converter. This represents the integral parameter of the outer loop PI control for the active power of the converter. This represents the proportional parameter of the outer loop PI control for reactive power of the converter. This represents the integral parameter of the outer loop PI control for the reactive power of the converter. Indicates the reactance of the transmission line. Indicates the resistance of the transmission line; ， in, This represents the proportional parameter of the PI control in the converter current control circuit. This represents the integral parameter of the PI control loop in the converter current control system. This represents the system's angular frequency constant.

2. The method for judging the synchronization stability of power electronic interface power supplies under small disturbances according to claim 1, characterized in that, The determination of small disturbance synchronization stability of the power electronic interface power supply based on the modified damping coefficient and the modified synchronization coefficient includes: If both the corrected damping coefficient and the corrected synchronization coefficient are positive, the system is stable under small disturbances; otherwise, the system is unstable under small disturbances.

3. The method for judging the synchronization stability of power electronic interface power supplies under small disturbances according to claim 1, characterized in that, The step of determining the synchronization stability of the power electronic interface power supply under small disturbances based on the modified complex torque coefficient includes: In response to the phase of the modified complex torque coefficient being in If the system is stable under small disturbances, then the system is stable; otherwise, the system is unstable under small disturbances.

4. The method for judging the synchronization stability of power electronic interface power supplies under small disturbances according to claim 1, characterized in that, The damping coefficient is expressed as: ， in, The damping coefficient represents the inherent oscillation mode of the phase-locked loop. This indicates the current balance point value of the converter's d-axis; The synchronization coefficient is expressed as: ， in, The synchronization coefficient represents the inherent oscillation mode of the phase-locked loop. Indicates the grid voltage. This indicates the phase balance point value of the phase-locked loop.

5. The method for judging the synchronization stability of power electronic interface power supplies under small disturbances according to claim 1, characterized in that, The total damping coefficient of the system is expressed as: ， in, This represents the total damping coefficient of the system. This represents the damping coefficient. This represents the additional damping coefficient; The overall synchronization coefficient of the system is expressed as: ， in, This represents the total synchronization coefficient of the system. This represents the synchronization coefficient. This represents the additional synchronization coefficient; The total complex torque coefficient of the system is expressed as follows: ， in, This represents the total complex torque coefficient of the system. This represents the angular frequency of the synchronous stable oscillation mode of the system.

6. A device for judging the synchronization stability of a power electronic interface power supply under small disturbances, characterized in that, include: The verification module is used to: calculate the system equilibrium point parameters based on the input system structure parameters and control parameters, and verify the existence of the equilibrium point based on the system equilibrium point parameters; The first calculation module is used to: calculate the damping coefficient and synchronization coefficient of the phase-locked loop's inherent oscillation mode based on the power electronic interface power supply small disturbance synchronization stability analysis framework in response to the existence of the equilibrium point; The second calculation module is used to: calculate the angular frequency of the system's synchronous stable oscillation mode, and calculate the additional complex torque coefficient based on the power electronic interface power supply small disturbance frequency domain linearization model containing the power loop; The third calculation module is used to: calculate the additional damping coefficient and the additional synchronization coefficient based on the angular frequency of the system's synchronous stable oscillation mode and the additional complex torque coefficient; wherein, the additional damping coefficient and the additional synchronization coefficient are used to measure the impact of the current loop, power loop and line dynamic process on the system's small disturbance synchronous stability; The fourth calculation module is used to: calculate the total damping coefficient of the system based on the damping coefficient and the additional damping coefficient; calculate the total synchronization coefficient of the system based on the synchronization coefficient and the additional synchronization coefficient; and calculate the total complex torque coefficient of the system based on the total damping coefficient, the total synchronization coefficient of the system, and the angular frequency of the system's synchronous stable oscillation mode. The correction module is used to: correct the total damping coefficient, the total synchronization coefficient, and the total complex torque coefficient of the system respectively by means of the correction complex torque coefficient method, so as to obtain the correction damping coefficient, the correction synchronization coefficient, and the correction complex torque coefficient; The stability assessment module is used to: determine the synchronization stability of the power electronic interface power supply under small disturbances based on the modified damping coefficient and the modified synchronization coefficient, or determine the synchronization stability of the power electronic interface power supply under small disturbances based on the modified complex torque coefficient; the additional complex torque coefficient is expressed as: ， ， in, This represents the additional complex torque coefficient. Indicates the grid voltage. This indicates the phase equilibrium point value of the phase-locked loop. This indicates the d-axis current balance point value of the converter. This indicates the q-axis current balance point value of the converter. Indicates the resistance of the transmission line. This represents the total reactance of the line from the converter terminal to the infinite power grid. Describes the differential operator in the Lagrangian field. Represents the system's angular frequency constant. This represents the proportional parameter of the outer loop PI control for the active power of the converter. This represents the integral parameter of the outer loop PI control for the active power of the converter. This represents the proportional parameter of the outer loop PI control for reactive power of the converter. This represents the integral parameter of the outer loop PI control for the reactive power of the converter. Indicates the reactance of the transmission line. Indicates the resistance of the transmission line; ， in, This represents the proportional parameter of the PI control in the converter current control circuit. This represents the integral parameter of the PI control loop in the converter current control system. This represents the system's angular frequency constant.

7. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps of the power electronic interface power supply small disturbance synchronization stability judgment method as described in any one of claims 1 to 5.

8. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the power electronic interface power supply small disturbance synchronization stability judgment method as described in any one of claims 1 to 5.

9. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the power electronic interface power supply small disturbance synchronization stability judgment method as described in any one of claims 1 to 5.

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