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针对配电网级联型静止无功补偿器(DSTATCOM),提出了采用多数字信号处理器(DSP)的分散控制策略。该控制策略采用中央控制器和单链节控制器相结合的多DSP硬件结构。中央控制器用于实现电压、电流双闭环上层控制算法,单链节控制器用于实现各链节的直流电容电压均衡控制并产生脉冲宽度调制(PWM)信号。采用这种分散控制策略,可以充分发挥中央控制器和单链节控制器的作用,大大简化控制系统的软、硬件设计。仿真和实验结果表明,采用基于分散控制策略的DSTATCOM控制系统,能够使DSTATCOM快速精准地跟踪直流电容电压和输出电流指令,输出电流总谐波畸变率(THD)小于3%,同时可获得很好的链节直流电容均压效果。
In view of the distribution network cascaded static var compensator (DSTATCOM), a decentralized control strategy using multiple digital signal processors (DSPs) is proposed. The control strategy uses a multi-DSP hardware architecture that combines a central controller with a single-link controller. The central controller is used to realize the double closed-loop control algorithm of voltage and current. The single-link controller is used to realize the DC capacitor voltage equalization control of each link and generate the pulse width modulation (PWM) signal. Using this decentralized control strategy, we can give full play to the central controller and single-link controller role, greatly simplifying the control system software and hardware design. The simulation and experimental results show that DSTATCOM control system based on decentralized control strategy can make DSTATCOM track dc capacitor voltage and output current accurately and quickly. The total harmonic distortion (THD) of output current is less than 3% The DC link voltage equalization effect.