论文部分内容阅读
并联型有源电力滤波器(SAPF)一般以三相六开关拓扑为基础,为了提高其应用于工业现场时的灵活性,提出了一种基于元件冗余的三相四开关容错型SAPF,并对容错电路结构及其运行模式进行了详细分析。在此基础上,针对某相故障状态下直流侧总电压波动及上下电容电压不平衡的情况,设计了相应的稳压及均压策略。同时,由于电路由三相六开关四线制转为三相四开关三线制结构运行,对容错运行状态下的控制策略进行了研究分析,保证了系统三相输出的对称性。50 k VA的容错型SAPF样机实验结果验证了所提出的控制策略的可行性和有效性。
The shunt active power filter (SAPF) is generally based on a three-phase six-switch topology. In order to increase its flexibility when applied to industrial sites, a three-phase four-switch fault tolerant SAPF based on component redundancy is proposed The fault-tolerant circuit structure and its operation mode are analyzed in detail. On the basis of this, aiming at the condition of the total DC voltage fluctuation and the unbalance of the upper and lower capacitor voltages in a fault condition, a corresponding voltage regulation and voltage sharing strategy is designed. At the same time, the control strategy under fault-tolerant operation is studied and analyzed because the circuit is changed from three-phase six-switch four-wire system to three-phase four-switch three-wire system structure to ensure the symmetry of the three-phase output of the system. The experimental results of a 50 k VA fault-tolerant SAPF prototype verify the feasibility and effectiveness of the proposed control strategy.