为解决电网电压不平衡时VSC-HVDC的有功功率以及直流母线电压周期波动,无差拍电流控制算法存在的因一拍固有采样延迟而导致的动态响应性能变慢,以及对交流侧滤波电感变化鲁棒性差等问题,提出两相静止坐标系下基于有功功率周期波动为零的正负序参考电流表达式的生成方法,进一步在无差拍电流控制算法中引入对电网电压和对滤波电感变化具有较强鲁棒性的网侧电流的预测算法.给出了详细的理论推导,并进行相应的仿真分析.结果验证了所提改进方案的正确性和有效性.%In order to solve the problems of VSC-HVDC within unbalanced grid,such as active power and DC voltage periodic ripple,lower dynamic performance caused by the essential sampling delay in deadbeat current(DBC)control, and the inferior robustness against the change of AC filter inductor when DBC is used in the system,in this paper,a positive and negative sequence reference current generation method is proposed based on active power periodic ripple (equal to zero)in the two-phase stationary frame. Furthermore,the AC grid voltage and AC side current prediction algo-rithm with high robustness against the filter variation is introduced into the DBC. The detailed theoretical derivation and simulation are performed. Simulation results verify the accuracy and feasibility of the proposed method.
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