交直流混联系统的静态电压稳定概率评估  

Probabilistic Evaluation of Static Voltage Stability for AC/DC Hybrid Transmission System

作　　者：李佳[1,2] 刘天琪[1] 李兴源[1] 詹福宇[3] 史华勃[4] 邢大鹏[2] 

机构地区：[1]四川大学电气信息学院,四川成都610065 [2]国网四川省电力公司技能培训中心,四川成都610072 [3]西北工业大学航空学院,陕西西安710072 [4]国网四川省电力公司电力科学研究院,四川成都610072

出　　处：《四川大学学报（工程科学版）》2015年第2期151-157,共7页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金重点项目资助(51037003);国家电网公司大电网重大专项资助项目(SGCC-MPLG027-2012)

摘　　要：针对负荷和发输电设备故障随机特性对静态电压稳定的影响,提出一种适用于交直流混联系统的静态电压稳定概率评估方法。采用了非序贯蒙特卡罗法,对负荷和发输电设备的状态进行了抽样。对时序负荷进行粒子群聚类,采用多维正态抽样技术对等值负荷进行状态抽样,使负荷样本能同时计及负荷相关性和不确定性。采用直流准稳态模型和电压稳定L指标对系统随机状态样本分别进行系统和局部电压稳定评估。最后,以IEEE-RTS系统为例验证了方法的正确性和有效性,并就直流双极运行、直流单极运行和交流系统下的静态电压稳定频率、概率分布和灵敏度进行了比较分析。结果表明:系统中直流输电比重对电压稳定的影响较大,比重增大将导致系统L指标升高,从而降低系统电压稳定性;同时节点L指标的值主要受负荷影响,其灵敏度主要受网络结构影响。In order to estimate the static voltage stability for AC / DC hybrid transmission system,a probabilistic method taking account of the stochastic influence of the changes of load and the faults of generating and transmission equipment was proposed. The non-sequential Monte Carlo method was carried out with the samples of load state and generating and transmission equipment's state. And the load state was obtained by the methods of load clustering and multivariate normal sampling. Furthermore,the L-index calculated with quasi steady state model of DC was used to assess the system voltage stability and the local voltage stability with an amount of random samples. Finally,the system IEEE-RTS was applied to demonstrate the validity. By the analysis of the frequency,probability distribution and sensitivity of the static voltage among the operation modes of DC bipolar,monopole and the original AC system,the results showed that the DC transmission ratio plays great role in static voltage stability which would be decreased when the ratio increases.

关 键 词：交直流混联系统 静态电压稳定 概率评估 非序贯蒙特卡罗法 

分 类 号：TM712[电气工程—电力系统及自动化]