Simulator of Power Electronics System Operating Conditions with Output Compensation

Abstract

The invention provides a working condition simulation device of a power electronic system with output compensation, which structurally includes an electrically connected power electronic converter circuit and a working condition simulation controller, and a frequency domain compensator inside the working condition simulation controller, It is used to fully or partially compensate the frequency domain characteristics of the power electronic converter circuit and the working condition simulation controller, and improve the consistency of the working condition simulation of the power electronic system. The output compensator adopted in the present invention can fully or partially compensate the influence of the output control closed-loop in the power electronic system operating condition simulation device on the system frequency domain characteristics, so that the dynamic performance of the system is closer to the theoretical value in the changing transient process. Approximate, improving the control bandwidth and response speed can also make the steady-state performance of the system in the middle and high frequency bands closer to the theoretical value, and increase the applicable frequency range of the working condition simulation device.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a power electronic system working condition simulation device with output compensation. Background technique [0002] With the development of electrical engineering technology, the use of electric energy in today's society tends to be diversified, and power electronics technology, which plays a key role in the conversion of AC and DC power, is also faced with increasingly higher operating power levels and application engineering. increasingly complex challenges. During design, R&D and factory commissioning, the functional and reliability tests of the power electronic system under specific operating conditions can truly describe the performance of the power electronic system and effectively determine the possible failure risks during actual operation. Guide the system design in a targeted manner, thereby saving the long-term maintenance cost of the system. [0003] The...

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Problems solved by technology

[0004] 1) When the control output forms a closed loop, this control closed loop is equivalent to a low-pass filter. When the time constant of the output filter is large, this low-pass filter will make the bandwidth of the system frequency domain characteristics significantly lower than the theoretical bandwidth. , so that the response speed of the system in dynamic processes such as load transients is slower than that of the actual system, which affects the simulation accuracy of dynamic processes;

[0005] 2) When the working condition of the simulated power electronic system is the working condition of the motor and other frequency changes, the effect of the output closed-loop on the bandwidth will also affect the steady-state performance of the system. When the fundamental frequency reaches the bandwidth of the control output closed-loop, the traditional working condition The deviation of the amplitude-frequency characteristics of the simulation method may cause the steady-state behavior characteristics of the system to be far from the theoretical value, and may even cause system instability

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