统一潮流控制器注入电压及串联换流器容量优化计算研究

目的  采用统一潮流控制器(Unified Power Flow Controller，UPFC)技术提高电网关键断面输电能力主要是通过向系统注入一定的串联电压，进而转移目标线路的潮流。 方法  文章重点针对关键送电断面，按照功能将区域电网划分为送端电网、互联网络和内部网络，按照高斯消去法将系统网络等值成两通道恒功率交换系统。在此基础上，分别针对单机无穷大系统和恒功率交换系统，基于能量守恒原理，应用向量法给出了UPFC投入前后，UPFC支路和等效支路之间电压、功角、阻抗、有功关系向量图，并利用经典功率传递函数，推导了UPFC的优化串联容量以及注入电压的计算方法。 结果  该计算方法简单实用，尤其适用于系统规划设计研究阶段。 结论  将上述方法应用于深圳电网实例计算，并与PSCAD仿真结果进行对比分析，验证了上述方法的有效性和实用性。

Optimization Calculation Method of Injection Voltage and Series Converter Capacity for Unified Power Flow Controller

Introduction The application of UPFC (Unified Power Flow Controller) is to increase the transmission capacity of key sections, which mainly through the injection of a certain series voltage into the system and therefore divert the power flow of target line. Method Focusing on the key transmission sections, the regional power grid was divided into the transmission network, the interconnection network and the internal network based on their function, then the Gaussian elimination method was used to equalize the system network into a two-channel constant power exchange system. On this basis, based on the energy conservation principle, the phasor method was applied to provide phasor graph of the voltage, power angle, impedance, and active power relationship between the UPFC branch and the equivalent branch before and after the UPFC was put into operation, respectively, for the stand-alone infinity system and the constant power exchange system. The classical power transfer function was used to deduced the UPFC injection voltage and series converter capacity calculation formula. Result The calculation method is simple and practical, especially suitable for power system planning and design stage. Conclusion The above method is applied to the calculation of Shenzhen power grid example, and compared with the simulation results of PSCAD, the validity and practicability of the method are verified.