基于虛擬同步發(fā)電機的微網(wǎng)逆變器控制策略研究
[Abstract]:As an effective way to integrate all kinds of distributed generation, microgrid has become the research focus and hotspot in the field of distributed generation. However, the micro-source with power electronic inverter as the interface has a fast response speed and a hard external characteristic, which leads to the system oscillation easily and the stability is not high. Virtual synchronous generator (Virtual Synchronous Generator,VSG) control technology, as a method to simulate the characteristics of synchronous generator, can bring rotating inertia characteristics such as synchronous generator to micro-grid system, and solve the problem of inertia deficiency in micro-grid system. It is important to improve the stability of microgrid system. On the basis of summing up the current control strategy of microgrid inverter, this paper focuses on the VSG control problem of microsource inverter. Firstly, the structure of microsource inverter voltage control is analyzed in detail, the basic principle of inverter SVPWM voltage control is given, and the voltage and current double loop decoupling controller and filter are designed. Secondly, on the basis of analyzing the control structure of synchronous generator, the control system structure of virtual synchronous generator is given, and the power frequency controller controlled by VSG is designed by analyzing the frequency modulation principle of governor unit of synchronous generator. The excitation controller controlled by VSG is designed by analyzing the voltage regulation principle of excitation control system. Finally, aiming at the problem of frequency regulation in the transient response of VSG, the relationship between the virtual inertia and the angular frequency change rate of the virtual rotor is deeply analyzed. The virtual inertia of the virtual synchronous generator is flexible and variable. A virtual synchronous generator control strategy with adaptive virtual inertia is proposed, which can adjust the virtual inertia adaptively with the change rate of rotor angular frequency. The influence of adaptive parameters on virtual inertia is also analyzed. The power and frequency controller of virtual synchronous generator is redesigned. The simulation model of VSG control strategy and adaptive virtual inertia control strategy are built in MATLAB/Simulink. The simulation results of VSG control strategy and traditional droop control strategy are compared. It is shown that the designed VSG not only simulates the droop characteristics of the synchronous generator, but also simulates the rotational inertia characteristics of the synchronous generator. By comparing the adaptive virtual inertia VSG control with the traditional fixed inertia VSG control, the simulation results show that the proposed VSG control strategy of the adaptive virtual inertia can adjust the virtual inertia according to the rotor angular frequency change in real time. The problem of slow frequency recovery in the transient response of VSG is solved.
【學(xué)位授予單位】:沈陽工業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2018
【分類號】:TM341;TM464
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