摘要
为使静止无功发生器(static var generator,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(discrete fouries transform,DFT)相结合的SVG指令电流检测方法,应用载波层叠脉宽调制(pulse width modulation,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。
To make static var generator （SVG） possessing synthetic compensation ability of reactive power, harmonics and asymmetric currents, the control strategy of cascade-connected medium- and high-voltage SVG is researched. Firstly, based on selective harmonic compensation strategy, a SVG reference current detection method utilizing the combination of synchronously rotating coordinate transformation with discrete Fourier transform （DFT） is proposed, and the tracking control of instruction c^u＇rent is implemented by carrier disposition pulse width modulation （PWM）, and in allusion to the carrier disposition PWM the capacitor voltage balancing control at DC side is realized by software based on the energy balance principle of inverter bridge itself. In view of low calculation burden and simple control strategy, the proposed control strategy is convenient for engineering implementation, and its effectiveness is proved by both results of simulation and experiments.
出处
《电网技术》
EI
CSCD
北大核心
2014年第2期495-501,共7页
Power System Technology
基金
高等学校博士学科点专项科研基金(20110095110014)~~
