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为了解决配电网中存在的三相电流不平衡、谐波污染等问题,本文提出了基于电流预测控制的补偿方法。采用瞬时无功功率理论,计算出所需的补偿电流,然后将电流预测控制方法运用到D-STATCOM,建立其离散化数学模型,采用遍历法推算出在全部开关函数组合分别作用下的补偿器输出电压,并用合适的价值函数来选择最优的开关组合,按照补偿电流的参考值快速输出补偿电流。在PSCAD/EMTDC仿真平台上进行了仿真验证,按照所设计的控制策略,对三相四线制下的不平衡感性负载和注入谐波两种情况进行了无功补偿和谐波消除仿真,仿真结果表明所提出的控制方法能够实现快速的无功补偿和谐波消除。
In order to solve the three-phase current imbalance in the distribution network, harmonic pollution and other issues, this paper presents a compensation method based on current predictive control. The instantaneous reactive power theory is used to calculate the required compensation current, and then the current predictive control method is applied to D-STATCOM to establish its discretization mathematical model. The ergodic method is used to calculate the compensator Output voltage, and use the appropriate value function to select the optimal switch combination, in accordance with the compensation current reference quickly output compensation current. Simulation is carried out on the PSCAD / EMTDC simulation platform. According to the designed control strategy, reactive power compensation and harmonic elimination simulation are carried out for imbalance inductive loads and injected harmonics under three-phase four-wire system. The simulation The results show that the proposed control method can achieve fast reactive power compensation and harmonic elimination.