CN-121984449-A - Power hardware-in-loop interface compensation method based on power amplifier parameter identification

CN121984449ACN 121984449 ACN121984449 ACN 121984449ACN-121984449-A

Abstract

The invention provides a power hardware-in-loop interface compensation method based on power amplifier parameter identification. By carrying out parameter identification on the power amplifier system, the parameter information of the passive devices in the power amplifier is estimated, and the robustness of the system to parameter changes is improved. Because the existence of the filter in the power amplifier usually causes the deviation of the actual power transmission and the ideal power transmission characteristic, the invention compensates the amplitude and phase angle deviation caused by the filter through the parameters identified in the interface method, thereby improving the power transmission precision and the reliability of the power hardware in the loop. In addition, the compensated system is closer to an ideal system, is more suitable for performing ring stability analysis and verification on power hardware, and has obvious advantages especially in the case of power amplifier parameter aging offset.

Inventors

XIE SHIMING
WANG XIUJIE
LUO FEIYANG
Ha Lifang
Yu Biyang

Assignees

中南大学

Dates

Publication Date: 20260505
Application Date: 20260126

Claims (4)

1. The power hardware-in-loop interface compensation method based on power amplifier parameter identification is characterized by comprising the following specific steps: s1, obtaining excitation of a parameter identification method through data filtering; s2, identifying parameter information of passive devices in the power amplifier based on a gradient descent method; S3, designing a power amplifier compensation interface method on a software side according to the identified parameters.
2. The power hardware-in-loop interface compensation method based on power amplifier parameter identification of claim 1, wherein the data filtering in step S1 comprises the following specific steps: According to kirchhoff's law, the average model of a power amplifier is expressed as: (1); Wherein the method comprises the steps of And Representing the filter inductance and filter capacitance of the amplifier respectively, Representing filter inductance Equivalent resistance of (a); , And Respectively, the output voltage, the inductor current and the output current, The dc side voltage is indicated as such, Representing a control input; Definition of the definition In order to output the variable(s), As a state variable, a state variable is used, For the coefficient matrix, write (1) as follows: (2); Wherein the method comprises the steps of , , ; Since differentiation cannot be realized in actual control, the signal is processed in the frequency domain as follows: (3); Where s is the Laplacian and λ is the attenuation coefficient; The equivalent form of (2) can be obtained as: (4); Wherein the method comprises the steps of , , 。
3. The method for compensating power hardware-in-loop interface based on power amplifier parameter identification as set forth in claim 1, wherein in the step S2, parameter information of passive devices in the power amplifier is identified based on a gradient descent method, and the specific process is as follows: By defining parameter estimation errors: (5); Wherein the method comprises the steps of A reference value representing a parameter to be identified, Representing an estimated value of the parameter to be identified; then the parameter estimation dynamic equation can be designed as (6); Wherein the method comprises the steps of Representing the derivative of the parameter estimate to be identified, Representing an identification convergence constant; according to (6), combining Lyapunov functions The method comprises the following steps of: (7); by selecting appropriate parameters And the convergence speed of a tracking error system is ensured.
4. The power hardware-in-loop interface compensation method based on power amplifier parameter identification of claim 1, wherein the power amplifier compensation interface method in step S3 comprises the following specific steps: the compensator is designed according to the identified parameters to have the following form (8); Wherein the method comprises the steps of To ensure the physical realizability of the compensator, a second-order low-pass filter is connected in series (9); Wherein the method comprises the steps of At the frequency of the resonance and, Is the damping ratio; then the total amplitude compensator is obtained as (10); At this time, a phase delay is additionally introduced (11); Wherein w r represents the filter resonance frequency, ζ op is open loop damping ratio, k is adjustable gain, and w is input signal frequency, so phase compensation is needed, in the interface method, the phase compensation can use harmonic successive compensation scheme based on frequency sampling filter.

Description

Power hardware-in-loop interface compensation method based on power amplifier parameter identification Technical Field The invention belongs to the field of inverter control, and particularly relates to a power hardware-in-loop interface compensation method based on power amplifier parameter identification. Background With the rapid development of computer technology, particularly parallel computing technology and various real-time simulation tools, hardware is increasingly used in the field of power electronics and power systems in loop simulation. The power hardware is tested in a loop as special hardware in the loop, provides power to the tested hardware, and allows repeated, safe and economical research on new equipment or new control methods to be performed in a simulated power grid system under realistic conditions. Because of the magnitude differences between the emulation system and the hardware system, appropriate power amplification and conversion devices are required as interfaces for the emulation and hardware. The ideal transformer type power amplifier is widely used because of its simplicity and good accuracy. However, the LC low-pass filter in the actual power amplifier may make it different in amplitude and phase from the ideal amplifier, and is affected by device aging, parameter offset, and thus deteriorate the power transfer characteristics of the system. Therefore, designing an interface method capable of coping with the variation of the filter parameters in the power amplifier has important significance for improving the stability and reliability of the system. Disclosure of Invention In order to solve the technical problems, the invention provides a power hardware-in-loop interface compensation method based on power amplifier parameter identification, which estimates the parameters of a filter in a power amplifier by a gradient descent method, designs a corresponding compensator in an interface method to compensate amplitude and phase offset caused by the filter, reduces the sensitivity of a system to the parameter change of the filter, and improves the reliability of the system. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the power hardware-in-loop interface compensation method based on the power amplifier parameter identification comprises the following specific steps: s1, obtaining excitation of a parameter identification method through data filtering; s2, identifying parameter information of passive devices in the power amplifier based on a gradient descent method; S3, designing a power amplifier compensation interface method on a software side according to the identified parameters. As an embodiment of the present invention, the specific process of filtering the data in the step S1 is as follows: according to kirchhoff's law, the average model of a power amplifier can be expressed as: (1) Wherein the method comprises the steps of AndRepresenting the filter inductance and filter capacitance of the amplifier respectively,Representing filter inductanceIs a constant current source.,AndRespectively, the output voltage, the inductor current and the output current,The dc side voltage is indicated as such,Representing a control input. Definition of the definitionIn order to output the variable(s),As a state variable, a state variable is used,As the coefficient matrix, (1) can be written as follows: (2) Wherein the method comprises the steps of ,,。 Since differentiation cannot be realized in actual control, the signal is processed in the frequency domain as follows: (3) Where s is the Laplacian and λ is the attenuation coefficient; The equivalent form of (2) can be obtained as: (4) Wherein the method comprises the steps of ,,。 As an embodiment of the present invention, the step S2 is based on a gradient descent method, and the specific process of identifying parameter information of the passive device in the power amplifier is as follows: By defining parameter estimation errors: (5) Wherein the method comprises the steps of A reference value representing a parameter to be identified,Representing the estimated value of the parameter to be identified. Then the parameter estimation dynamic equation can be designed as (6) Wherein the method comprises the steps ofRepresenting the derivative of the parameter estimate to be identified,Indicating the recognition convergence constant. According to (6), combining Lyapunov functionsIt is possible to obtain: (7) by selecting appropriate parameters And the convergence speed of a tracking error system is ensured. As an embodiment of the present invention, the power amplifier compensation interface method in step S3 includes the following specific steps: the compensator is designed according to the identified parameters to have the following form (8) Wherein the method comprises the steps ofIs the impedance of the device under test. To ensure the physical realisation of the compensator, a second ord