三相储能型准Z源并网逆变器有限开关序列模型预测直接功率控制

Finite Switching Sequence Model Predictive Direct Power Control of a Three-phase Energy-stored Quasi-Z-source Grid-connected Inverter

以三相储能型准Z源并网逆变器为研究对象,以提高逆变器的响应速度,实现多目标协同控制为研究目标。首先,推导了三相储能型准Z源并网逆变器的离散化数学模型;然后,介绍了传统的有限集模型预测直接功率控制(finite control set model predictive direct power control, FCS-MPDPC)策略。为了克服传统FCS-MPDPC策略开关频率不固定,电流谐波分布无规律,控制精度依赖于高采样频率的缺点,提出了一种有限开关序列模型预测直接功率控制(finite switching sequence model predictive direct power control,FSS-MPDPC)策略;最后,通过实验对FCS-MPDPC策略和FSS-MPDPC策略进行了对比验证,结果证明了所提控制策略的有效性。

In this paper, the three-phase energy-stored quasi-Z-source grid-connected inverter is studied to improve the inverter’s response speed and realize multi-target cooperative control. Firstly, the discrete-time mathematical model of three-phase energy-stored quasi-Z-source grid-connected inverters is derived. Secondly, the traditional finite control set model predictive direct power control strategy is introduced. In order to overcome the disadvantages of FCS-MPDPC strategy, which include that the switching frequency is not fixed, that the current harmonic distribution is irregular, and that the control accuracy highly depends on high sampling frequency, a finite switching sequence model predictive direct power control strategy is proposed. Finally, the FCS-MPDPC strategy and the FSS-MPDPC strategy are compared and verified through experiments. And the results demonstrate the effectiveness of the proposed strategy.