电力系统保护与控制
電力繫統保護與控製
전력계통보호여공제
POWER SYSTM PROTECTION AND CONTROL
2014年
6期
77-83
,共7页
张龙%黄家栋%王莉莉
張龍%黃傢棟%王莉莉
장룡%황가동%왕리리
Copula函数%风速相关性%随机响应面法%平方欧式距离%暂态稳定
Copula函數%風速相關性%隨機響應麵法%平方歐式距離%暫態穩定
Copula함수%풍속상관성%수궤향응면법%평방구식거리%잠태은정
Copula function%wind speed correlation%stochastic response surface method%squared Euclidean distance%transient stability
大型风电场中不同风机间的风速往往会因地理位置较近而具有一定的相关性。将随机响应面法应用于系统暂态稳定分析中,该方法能建立随机输入与输出响应之间的多项式关系,只需少量的仿真次数便可估计响应的统计信息。采用t-Copula函数建立具有相关性的风速模型,并用秩相关矩阵度量风速相关性。将变换后的风速作为随机响应面法的输入,来研究暂态输出响应的统计特性。云南电网的算例表明,风速相关性对系统暂态稳定有一定的影响,考虑风速相关性会使系统暂态稳定分析更贴近实际,对系统安全稳定运行有更明确的指导作用。
大型風電場中不同風機間的風速往往會因地理位置較近而具有一定的相關性。將隨機響應麵法應用于繫統暫態穩定分析中,該方法能建立隨機輸入與輸齣響應之間的多項式關繫,隻需少量的倣真次數便可估計響應的統計信息。採用t-Copula函數建立具有相關性的風速模型,併用秩相關矩陣度量風速相關性。將變換後的風速作為隨機響應麵法的輸入,來研究暫態輸齣響應的統計特性。雲南電網的算例錶明,風速相關性對繫統暫態穩定有一定的影響,攷慮風速相關性會使繫統暫態穩定分析更貼近實際,對繫統安全穩定運行有更明確的指導作用。
대형풍전장중불동풍궤간적풍속왕왕회인지리위치교근이구유일정적상관성。장수궤향응면법응용우계통잠태은정분석중,해방법능건립수궤수입여수출향응지간적다항식관계,지수소량적방진차수편가고계향응적통계신식。채용t-Copula함수건립구유상관성적풍속모형,병용질상관구진도량풍속상관성。장변환후적풍속작위수궤향응면법적수입,래연구잠태수출향응적통계특성。운남전망적산례표명,풍속상관성대계통잠태은정유일정적영향,고필풍속상관성회사계통잠태은정분석경첩근실제,대계통안전은정운행유경명학적지도작용。
Wind speeds of different wind turbines in a big wind farm always have correlations because of their close geographical location. This paper applies stochastic response surface method (SRSM) to analyze transient stability of power system. This method establishes polynomial relationship between inputs and transient stochastic output responses, and estimates the probability statistics of output responses by less times of simulation. Then this paper builds wind speed model by t-Copula function and uses rank correlation matrix to measure the correlations of wind speeds. Wind speed vector is transformed as the input of SRSM in order to study the probability statistics of output responses. The case study on Yunnan Power Grid shows that correlations of wind speeds have certain effect on the transient stability of power system. Taking the correlations of wind speeds into consideration makes the analysis of system’s transient stability more practical, and can guide the stable operation of systems.