摘要
无功功率与系统电压稳定及电压崩溃现象密切相关,对系统稳定运行具有重要意义,然而在传统的电力系统可靠性评估中,很少计及无功功率的影响。西北与新疆联网二通道建成后,新能源电力通过特高压、远距离、弱联系电网传输,对传输电网电压稳定提出了更高的要求,传统固定式补偿设备难以适应电网发展。为此,文章以青海海西实际电网为例,重点针对交流特高压及其近区330 k V电网,将灵敏度分析法与V-Q分析法相结合,综合分析特高压交直流混联弱送端电网的动态无功配置方案,为大型送端电网动态无功补偿配置提供了一种实用的方法。
Reactive power is closely related with electric power voltage stability and voltage collapse accidents, and then is very important to stable operation of electric power system. However, the effect of reactive power is of little concern in the reliability assessment of electric power system. After the second pass of the Xinjiang power grid networking to the West-Northern China electric power grid was built, the power from new energy are transferred in long distance with weak ultra-voltage transmission grid. The situation means higher requirement to the voltage stability of the power transmission grid and traditional fixed reactive power compensation equipments no longer suit to the gird development. Taking the Western power gird in the Qinghai province as example and focusing on the ultra-voltage AC power grid and the close 330 kV power grid, this paper analyzes the dynamical reactive power compensation scheme for the weak power grid at the feeding end in an AC and DC hybrid power system and gives a practical method to configure dynamically reactive compensation at the large feeding end power grid.
出处
《青海电力》
2015年第1期4-8,共5页
Qinghai Electric Power
关键词
电压稳定性
动态无功补偿
运行特性
voltage stability
dynamical reactive power compensation
operation characteristics