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由于滤波电容并联在负载侧的单相动态电压恢复器(dynamic voltage restorer,DVR)有更好的滤波效果,因此针对该拓扑提出一种基于离散状态空间的负载电压控制策略。该控制策略包含两个方面,一方面采用离散状态反馈跟踪指令,另一方面采用前馈解耦抑制扰动。将实际控制系统中存在的滞后一拍当做新的状态变量参与反馈,增强了系统可控性。由于控制自由度足够,因此可根据阻尼比和带宽直接配置零极点,以获得更好的指令跟踪能力。由于负载电压是控制目标,电源电压和负载电流扰动会影响控制性能,因而采用前馈解耦的控制方法抑制扰动的影响。在1.5 kW的单相DVR实验装置上的实验结果验证了该控制策略的有效性。
Due to the better filtering effect of single-phase dynamic voltage restorer (DVR) with filter capacitor in parallel on the load side, a load voltage control strategy based on discrete state space is proposed for this topology. The control strategy consists of two aspects, on the one hand discrete state feedback tracking instructions, on the other hand the use of feedforward decoupling suppression disturbance. The actual control system lags behind as a new state variables involved in feedback, enhanced system controllability. Due to the sufficient degree of freedom of control, the pole-zero can be directly configured according to the damping ratio and the bandwidth so as to obtain better instruction tracking capability. Since the load voltage is the control target, the disturbance of the power supply voltage and the load current will affect the control performance. Therefore, the control method of feedforward decoupling is used to restrain the disturbance. The experimental results on a 1.5 kW single-phase DVR experimental device verify the effectiveness of this control strategy.