国家自然科学基金( 52177039)、河南省科技攻关项目( 232102240095,222102240027)、河南省高校基本科研业务费专项资金(NSFRF230638)项目资助
为提升单相五电平整流器的控制性能,研究了一种基于无延时功率观测器的双闭环综合控制方法。 该方法通过提出一 种虚拟电流信号重构算法并结合改进广义积分算法构建了无延时功率观测器,将其应用到整流器内环的模型预测功率控制当 中实时观测所需功率,同时电压外环采用线性自抗扰控制代替传统比例积分算法。 实验结果表明,该控制方法在功率突变后重 新跟踪给定值所需时间缩短了 5~ 7 ms,在电网电压跌落和负载扰动工况下使直流侧电压波动分别降低 4. 4%和 4. 8%。 相较于 传统方法,本文方法不仅降低了整流器的启动超调、提升了内环模型预测功率控制的动态性能,而且有效增强了电压外环的抗 干扰能力。
In order to improve the control performance of single-phase five-level rectifier, a dual closed-loop integrated control method based on non-delay power observer was studied. In this method, a virtual current signal reconstruction algorithm is proposed and combined with the improved generalized integration algorithm to construct a non-delay power observer, which is applied to the model predictive power control of the inner loop of the rectifier to observe the required power in real time, while the linear distraction control is used instead of the traditional proportional integration algorithm by linear distraction control in the outer voltage loop. The experimental results show that the time required for the control method to retrace the given value after the power mutation is shortened by 5~ 7 ms, and the voltage fluctuation on the DC side is reduced by 4. 4% and 4. 8% under the grid voltage drop and load disturbance conditions, respectively. Compared with the traditional method, this method not only reduces the overshoot of rectifier, improves the dynamic performance of the predicted power control of the inner loop model, but also effectively enhances the anti-interference ability of the voltage outer loop.