一种链式同步静止补偿器直流电压平衡方法

A Novel DC Capacitor Voltage Balance Strategy of Chain-circuit Static Synchronous Compensator

针对链式同步静止补偿器(STATCOM),建立了数学模型并分析了直流电容电压的不平衡机理。在理论分析的基础上,针对采用阶梯波调制策略的链式STATCOM,提出了一种新型直流电压平衡控制方法。该方法应用二路归并排序对直流电容电压进行快速排序,推导了新的链节触发脉宽计算公式,并提出了新型链节脉宽分配方法来平衡各链节的直流电容电压。理论分析和实验结果表明,新型链式STATCOM直流电压平衡控制方法简便易行,特别适用于链节数较多的工业化应用场合。

Mathematical model of chain-circuit static synchronous compensator （STATCOM） is set up and the mecha- nism of DC capacitance voltage imbalance is analyzed at the beginning of this paper.Furthermore ,on the basis of the- oretical analysis, a novel DC capacitor voltage balance strategy of chain-circuit STATCOM is proposed basing on step wave modulation method.2-way merge sort algorithms are used in this strategy to get the DC capacitance voltage size sequence quickly, moreover, novel pulse width calculation and distribution algorithms of each link is deduced in order to balance the link capacitor voltage.Theoretical analysis and experimental results show that the new strategy is simple and easy, especially suitable for the link for many industrial applications.