摘要
通过对系统节点无功网损灵敏度指标的大小进行排序,快速准确地找出系统的薄弱节点或薄弱区域;应用连续潮流法克服系统接近稳定极限运行状态时潮流雅可比矩阵不收敛的问题,得到系统薄弱节点的PV曲线,进而获得指示各负荷节点维持电压稳定性能力强弱的两个重要参量——临界电压和极限功率。同时引入负荷裕度指标来指示系统当前运行点离电压崩溃点的距离。在薄弱节点加装静止无功补偿器SVC提高了整个系统的电压稳定水平。另外,将概率分析方法引入到电压稳定问题的研究中,以克服传统的确定性分析方法评估结果偏保守的不足。最后通过对IEEE14节点系统进行仿真计算,验证了算法和指标的准确性及有效性。
Determining vulnerable nodes or areas of power system rapidly and accurately by sorting the reactive loss sensitivity index of nodes.Continuation power flow can solve the problem of unconvergency of Jacobin matrix when the system is close to the limit operate state.And the PV curve of weak nodes is obtained.Then two important indexes that indicate the capability of maintaining the voltage stability of load nodes is obtained-critical voltage and limiting power.Load margin is introduced to demonstrate the distance between operation point and voltage collapse point.Voltage stability level of power system is improved by installing SVC in weak nodes.Furthermore,probability analysis method is introduced to the research of voltage stability to make up for the shortcomings of traditional methods.Finally,IEEE14 nodes test system is simulated.And the results verify the accuracy and effectiveness of the algorithm proposed in this paper.
出处
《电力科学与工程》
2011年第12期22-26,58,共6页
Electric Power Science and Engineering
关键词
连续潮流法
无功网损灵敏度
预想事故
电压失稳概率
continuation power flow
reactive loss sensitivity
predicted failure
probability of voltage instability
