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电网技术  2015 

基于多绕组调节模式的变压器式可控电抗器谐波电流优化

DOI: 10.13335/j.1000-3673.pst.2015.10.047, PP. 2993-2999

Keywords: 变压器式可控电抗器,多绕组调节模式,非线性优化模型,谐波对消

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Abstract:

变压器式可控电抗器(controllablereactoroftransformertype,CRT)目前的调节模式仅限于单绕组调节模式,此时CRT的谐波电流含量无法满足要求更高的应用场合。为进一步改善CRT的谐波性能,提出了多绕组调节模式的基本概念;采用分段线性化的方法,推出CRT工作绕组瞬时电流的计算通式;利用傅里叶级数分析方法求得工作绕组电流基波及各次谐波分量有效值与各触发角之间的函数关系式。将CRT整个容量范围进行离散,依次以各离散容量点为等式约束,以CRT向电网注入的谐波电流含量为目标函数,建立非线性优化模型,并调用Matlab中的求解非线性约束最小化问题的函数(Fmincon)逐点求解,从而实现了CRT的谐波优化调节模式。算例分析显示谐波优化调节模式的谐波性能明显优于目前公认的谐波性能最好的固定单支路调节模式。最后借助CRT等值电路仿真模型指出文中提出的谐波优化方法的本质是基于谐波对消原理,在相控方式下,“对消”原理比已有的“稀释”原理能够更显著地减小CRT注入电网的谐波含量。

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