Abstract: A Predictive Power Control（PPC） method based on duty ration optimization is used in Static Synchronous Compensator （STATCOM） to solve the larger power ripple and inconstant switching frequency in traditional Direct Power Control （DPC）. It analyzes the basic structure of STATCOM. Considering the actual discreteness of digital processing system, the power predictive function of STATCOM is derived, and the essential reason cause power ripple is analyzed in detail. Based on the Look Up Table （LUT） it gets the optimal voltage vector which can eliminate the power error of the system, adopt the way of duty ratio optimization to correct the voltage vector, and a duty ratio calculating function is constructed to minimize the power tracking error at k+1 sampling time. The STATCOM system prototype experiment is carried out based on multiple CPU control platform, experimental results show that proposed PPC method can suppress the power ripple effectively and get a constant switching frequency, and it keeps the high dynamic response performance of traditional DPC.

Key words: Static Synchronous Compensator（STATCOM）, predictive control, duty ratio optimization, power ripple reduce

摘要： 将基于占空比优化的预测功率控制（Predictive Power Control，PPC）策略应用于静止同步补偿器（Static Synchronous Compensator，STATCOM）中，来解决传统直接功率控制（Direct Power Control，DPC）策略中存在的功率脉动过大、开关频率不固定等问题。在分析STATCOM基本结构的基础上，结合实际数字处理系统离散运行的特点，推导出STATCOM系统的功率预测方程，并详细地分析了造成系统功率脉动过大现象的本质原因。根据查找表（Look Up Table，LUT）得到消除系统功率误差最优的电压矢量后，采用占空比优化的方式对该电压矢量进行幅值修正，构建了一个使k+1采样点功率跟踪误差最小为目标的占空比求取函数。基于多CPU的控制平台进行了STATCOM系统样机实验，实验结果表明所提PPC策略有效地抑制系统的功率脉动、恒定系统的开关频率，同时其保留了传统DPC策略高动态响应的优异特性。

关键词: 静止同步补偿器（STATCOM）, 预测控制, 占空比优化, 功率脉动抑制