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电网技术  2014 

中高压链式SVG控制策略

DOI: 10.13335/j.1000-3673.pst.2014.02.034, PP. 495-501

Keywords: 静止无功发生器,选择性谐波补偿,指令电流检测,电流跟踪控制,直流侧电容电压均衡控制

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Abstract:

为使静止无功发生器(staticvargenerator,SVG)具备无功、谐波及不对称电流的综合补偿能力,对中高压链式SVG的控制策略进行了研究。基于选择性谐波补偿策略提出了利用同步旋转坐标变换及离散傅里叶变换(discretefouriestransform,DFT)相结合的SVG指令电流检测方法,应用载波层叠脉宽调制(pulsewidthmodulation,PWM)实现指令电流跟踪控制,针对载波层叠PWM方法采用基于逆变桥自身能量平衡原理的软件方法实现直流侧电容电压均衡控制。该控制策略方法简便,运算量较小,便于工程实现,仿真和实验验证证明了其有效性。

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