UPFC的模糊调制控制研究

以统一潮流控制器（UPFC）为研究对象，针对其调制控制，引入模糊技术，设计了模糊调制控制器，以抑制互联电力系统联络线功率振荡，改善系统的动态稳定性。给出了模糊调制控制器的结构，运用梯度下降法对模糊控制器的关键参数进行了优化。结合UPFC具有串、并联元件的特点，提出了模糊联合调制控制器，相对于单一元件调制控制，可更有效地阻尼功率振荡。多机系统仿真结果表明模糊调制控制器能有效地抑制振荡，并且在运行工况改变时性能优于线性调制控制器，而联合调制又优于单一元件调制。

STUDY ON FUZZY MODULATION CONTROL OF UPFC

FACTS (flexible AC transmission systems) technology offers an alternative way in damping low frequency powersystem oscillations. Oriented to the modulation control of UPFC (unified power flow controller), this paper constructs afuzzy modulation controller (FMC) with fuzzy logic incorporated, so as to damp the power oscillations of tie-lines andimprove the dynamic stability of the whole system. The structure of FMC is given in detail, and the key parameters are tunedby gradient descent training method. Furthermore, taking the feature of the shunt--series structure of UPFC intoconsideration, the concept of combined modulation is proposed to get better damping performance than the single--elementmodulation. The digital simulation conducted on a multi--machine interconnected power system shows that the designed FMCis efficient in damping power oscillations, and has better performance than the linear counterpart when operating pointchanges. The simulation results also show that the combined modulation is better than shunt or series modulation.This project is jointly supported by National Scaling Project--B and PGC Foundation of Hong Kong SAR.