CAJ | 학술논문

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。
위사정지무공발생기(static var generator，SVG)구비무공、해파급불대칭전류적종합보상능력，대중고압련식SVG 적공제책략진행료연구。기우선택성해파보상책략제출료이용동보선전좌표변환급리산부리협변환(discrete fouries transform，DFT)상결합적SVG지령전류검측방법，응용재파층첩맥관조제(pulse width modulation，PWM)실현지령전류근종공제，침대재파층첩PWM방법채용기우역변교자신능량평형원리적연건방법실현직류측전용전압균형공제。해공제책략방법간편，운산량교소，편우공정실현，방진화실험험증증명료기유효성。
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 current 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.