非解析复变电力系统动态无功点优化配置

Optimization configuration of dynamic reactive power point for non-analytical complex variable power system

动态无功补偿装置在电网中无功补偿的效果很大程度上取决于补偿点的选择。从非解析复变电力系统的动态分析方法出发,指出阻抗模裕度指标是电压稳定性分析最直观的指标,并利用该指标对系统薄弱环节进行一个初步判定。然后分析了系统在暂态扰动下失稳的过程,指出暂态稳定裕度指标是描述系统暂态扰动过程稳定性的最本质指标,利用动态无功补偿装置可以改善此指标。在此基础上,提出了一种结合阻抗模裕度指标和暂态稳定裕度指标的动态无功优化配置方法,比较各种无功配置方案下暂态稳定裕度指标的提升值以得到最优配置方案。通过IEEE39母线系统和广东电网220kV网络算例说明了该方法的有效性。

The effect of reactive power compensation largely depends on the reactive power compensation point selection.From the dynamic analysis methods for non-analytic complex variable power system,the impedance modulus margin index is pointed out to be the most intuitive indicator for voltage stability analysis,and it is used to preliminarily determinate weak line in system.Then this paper analyzes the system instable process under the transient disturbances,and points out that the transient stability margin is the essential indicator describing the stability of the system transient disturbance process,which can be quickly calculated by using extended equal area criterion.On the basis,a kind of dynamic reactive power optimization configuration method based on transient stability margin index is put forward,then the transient stability margin index increase values of various reactive power allocation schemes are compared to get the optimal one.By IEEE 39-bus system and the Guangdong Power Grid 220kV network system examples,this method is proved to be effective.