摘要
特高压输电线的无功/电压控制方式影响其传输能力和运行稳定性。首先建立了用分布参数表达的输电线的功角特性方程,推导出了输电线的功率-电压特性方程,用该方程分析了送端恒电压控制、受端恒功率因数控制下输电线的运行特性,绘出了受端在三种典型功率因数下运行的P-V特性曲线,表明输电线的传输能力随受端功率因数的上升而提高,但其过电压的功率区间也随之扩大,特别是在受端功率因数超前状态下有很大的超开路电压区间。同时还用功角特性方程推导出了两端恒定电压运行状态下输电线剩余无功功率的算式,进而推导出了输电线两端恒电压控制所需要的无功补偿量的算式,并以晋东南(长治)—南阳—荆门1000kV特高压输电线作为算例,对两种控制方式下的传输能力和变电站的无功补偿量进行了验证。
Transmission capacity and operation stability are affected by reactive power and voltage control modes for ultra-high vohage（UHV） transmission line. This paper presents the power-angle characteristic equations described by the distributed parameters and power-voltage characteristic equations for transmission line. Using power-voltage characteristic equations, it analyzes operation characteristic under constant voltage control at the sending end and constant power factor at the receiving end of transmission line. At the same time, it draws P-V characteristic curves under three typical power factors at the receiving end. It indicates transmission capacity of transmission line will increase with power factors at the receiving end rising. But power area leading to overvoltage will extend, especially it appears very big over open- circuit voltage area under leading power factor at the receiving end. Using the power-angle characteristic equations, it derives formulas of surplus reactive power and demands of reactive power compensation capacity under constant voltage of each end of transmission line. Taking Jindongnan-Nanyang-Jingmen 1 000 kV UHV transmission line as an example, transmission capacity and demands of reactive power compensation capacity are calculated for two control modes.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2010年第1期83-87,共5页
Journal of Chongqing University
基金
国家自然科学基金资助项目(50807055)
关键词
特高压输电
稳定性
功角特性
功率-电压特性
无功补偿
uhra-high voltage transmission
stability
power-angle characteristic
P-V characteristic
reactive power compensation
