CAJ | 학술논문

统一潮流控制器自身结构复杂、变量多，为了简化其控制器的设计过程，建立只考虑并-串联变流器交流侧电流状态和直流电容电压状态的UPFC的5阶非线性模型。采用双环控制策略来设计UPFC控制器，通过PI外环控制直流电容电压，选取并-串联变流器交流侧电流作为系统控制输出，通过状态反馈精确线性化将原非线性系统线性化为4个线性子系统，并应用变结构控制原理实现并-串联变流器交流侧输出电流的内环控制。仿真结果验证了该控制策略的有效性。
통일조류공제기자신결구복잡、변량다，위료간화기공제기적설계과정，건립지고필병-천련변류기교류측전류상태화직류전용전압상태적UPFC적5계비선성모형。채용쌍배공제책략래설계UPFC공제기，통과PI외배공제직류전용전압，선취병-천련변류기교류측전류작위계통공제수출，통과상태반궤정학선성화장원비선성계통선성화위4개선성자계통，병응용변결구공제원리실현병-천련변류기교류측수출전류적내배공제。방진결과험증료해공제책략적유효성。
Unified power flow controller is complicated structure,and variables. In order to simplify the controller design process for it,a nonlinear model of UPFC is established that considers the state of parallel-series converters current and DC capacitor voltage. The double loop control strategy is used to design the controller of UPFC. In the outer ring,the DC capacitor voltage is controlled by using PI controller. AC side current of parallel-series convert-ers are selected as control output of system,the system model is changed into four linear subsystems by exact lin-earization via feedback,and variable structure control theory is used to realize the inner loop control for AC side output-current of parallel-series converters. The simulation results demonstrate the effectiveness of the strategy.