利用附加节点注入电流法设计静止同步串联补偿器的潮流控制器

USING THE METHOD OF INJECTING CURRENT FROM ADDITIONAL NODES FOR MODELING AND SIMULATION OF SSSC POWER FLOW CONTROLLER

从静止同步串联补偿器(SSSC)的原理和特性出发,分析了其稳态特性和数学模型,研究对比了SSSC及其它FACTS装置潮流建模的方法,通过分析节点导纳矩阵和雅可比矩阵的修正,提出了利用附加节点注入电流法建立SSSC潮流模型的方法,并分析了此方法的优点。在电力系统分析综合程序PSASP中,利用用户接口程序实现了SSSC的潮流建模,结合开发的潮流控制模块,解决了含SSSC装置的大系统仿真问题。在EPRI-7节点系统的分析计算中,验证了理论分析的正确性和SSSC潮流模型的控制作用。并与相同控制条件下TCSC特性作了比较,结果表明:SSSC能够以更小的输出功率实现相同的控制效果,而且在小功率情况下,SSSC的优势更加明显。

This paper investigates a model of SSSC （Static Synchronous Series compensator） in Newton power flow analysis in PSASP （Power system analysis software package）. The model considers characteristic of injected voltage and control constraints of SSSC. Based on the Nordon＇s theorem, the SSSC is equaled to injecting current into the additional nodes. By modifying the admittance matrix through additional nodes and modifying Jacobin matrix by additional injection quantity, the key problem of developing a suitable model of SSSC for power flow calculation in bulk power grid is resolved. By using the UD （User Defined） and UPI （User Program Interface） function provided by PSASE the SSSC can be simulated to provide both capacitive and inductive compensation by injecting current model. Simulation results based on EPRI-7 system are presented to demonstrate the performance of SSSC power flow model. The satisfactory steady state performance also shown SSSC has more effective regulation ability than TCSC （Thyristor Controlled Series Capacitor） even in low power flow conditions.