UPQC直流电压建立方法及其启动策略研究

摘要

Unified power quality conditioner (UPQC) is a kind of comprehensive power quality compensation equipment with complex circuit and structure. Starting UPQC involves the establishment of the DC side capacitance voltage, logical sequence of series, parallel compensator and load, namely each part of UPQC must have a certain of start time sequence and logic control strategy. This paper discusses three establishing methods of the capacitor voltage on DC side of UPQC, which can be considered as DC power, and analyzes their advantages and disadvantages, too. Then the control logic of UPQC starting, namely the order of power supply, series and parallel compensator, and load, is discussed based on the different capacitor voltage establishment methods. The reason of adopting these switching sequences is analyzed and the detailed start logic diagram is drawn. Finally, different switching sequences are simulated by MATLAB/Simulink. The simulation results show that the proposed strategy is effective.%统一电能质量调节器( UPQC)是一种综合补偿装置,其电路及结构较为复杂,如何正常启动UPQC是其投入实际应用过程中必须要考虑的问题.启动UPQC涉及直流侧电容电压的建立,串、并联补偿器及负载的投入时机,即UPQC各部分的启动必须具有一定的时间先后顺序及逻辑控制策略.探讨了UPQC启动时作为直流电源的直流侧电容电压的三种建立方法,分析了其优缺点.在此基础上,探讨了UPQC启动时的控制逻辑,即在不同的直流侧电容电压建立方法基础上,电源、串、并联补偿器、负载的投切顺序,分析了采用这些投切顺序的原因,探讨了采用不同控制策略的情况下,UPQC的启动控制策略,画出了详细的启动逻辑框图.最后通过仿真验证了采用直接控制策略和间接控制策略时的启动策略,仿真结果表明这些启动方法是有效的.