并网电压源逆变器的电网调压直接功率控制

Yonghao Gui, Chunghun Kim, C. Chung
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引用次数: 33

摘要

针对并网电压源逆变器(VSI)的瞬时有功和无功功率控制,提出了一种电网电压调制(GVM)直接功率控制(DPC)策略。GVM-DPC在不使用锁相环的情况下以d-q帧表示系统。此外,GVM方法将系统转化为线性定常系统。GVM-DPC不仅具有瞬时有功功率和无功功率的收敛速度,而且具有稳态性能,设计成两个独立的二阶系统。此外,闭环系统在整个工作范围内呈指数稳定。利用MATLAB/Simulink和PLECS块集对该方法进行了验证。仿真结果表明,该方法不仅具有良好的有功和无功跟踪性能,而且比滑模控制DPC方法具有更小的电流总谐波失真。最后,通过一个带数字信号处理器的半实物系统对该方法进行了验证。实验结果与仿真结果基本一致。此外,还对该系统对线路阻抗和电网电压的鲁棒性进行了测试和讨论。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Grid voltage modulated direct power control for grid connected voltage source inverters
We propose a grid voltage modulated (GVM) direct power control (DPC) strategy for a grid-connected voltage source inverter (VSI) to control the instantaneous active and reactive powers. The GVM-DPC presents the system in d-q frame without using a phase-lock loop. In addition, the GVM method converts the system into a linear time-invariant system. The GVM-DPC is designed to obtain two separate second-order systems for not only the convergence rate of the instantaneous active and reactive powers but also the steady-state performance. In addition, the closed-loop system is exponentially stable in the whole operating range. The proposed method is verified by using MATLAB/Simulink with PLECS blockset. The simulation results show that the proposed method has not only good tracking performances in both active and reactive powers but also a lower current total harmonic distortion than that of the sliding mode control DPC method. Finally, the proposed method is validated by using a hardware-in-the-loop system with a digital signal processor. The experimental results are similar to simulation results. Moreover, the robustness to the line impedance and the grid voltage is tested and discussed.
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