合肥工业大学学报(自然科学版)
閤肥工業大學學報(自然科學版)
합비공업대학학보(자연과학판)
JOURNAL OF HEFEI UNIVERSITY OF TECHNOLOGY(NATURAL SCIENCE)
2014年
8期
916-921
,共6页
风电接入%配电网%电压稳定性%多场景%随机潮流%节点参与因子
風電接入%配電網%電壓穩定性%多場景%隨機潮流%節點參與因子
풍전접입%배전망%전압은정성%다장경%수궤조류%절점삼여인자
wind power integration%distribution network%voltage stability%multi-condition%stochas-tic power flow%bus participation factor
文章针对风电接入配电网时考虑电压稳定性的无功优化进行研究。利用多场景技术对风电机的出力进行建模,在计及负荷波动的情况下,对配电网采用蒙特卡洛方法进行随机潮流计算,求得节点电压、风电机无功出力等变量的期望与标准差;然后利用连续潮流与全概率公式计算多场景下风机接入的电压稳定裕度期望。在此基础上利用遗传算法对配电网进行无功补偿优化投切,IEEE33系统的计算结果表明该方法可以改善配电网无功分布,提高电压水平,降低配电网运行的风险。最后分析了节点参与因子对风电机选址的影响,数值分析的结果表明将风电机安装在负荷节点参与因子较大的地方可以进一步降低配电网运行的风险,使得系统各个节点电压分布更加均匀,同时能够给系统运行留出更多裕量。
文章針對風電接入配電網時攷慮電壓穩定性的無功優化進行研究。利用多場景技術對風電機的齣力進行建模,在計及負荷波動的情況下,對配電網採用矇特卡洛方法進行隨機潮流計算,求得節點電壓、風電機無功齣力等變量的期望與標準差;然後利用連續潮流與全概率公式計算多場景下風機接入的電壓穩定裕度期望。在此基礎上利用遺傳算法對配電網進行無功補償優化投切,IEEE33繫統的計算結果錶明該方法可以改善配電網無功分佈,提高電壓水平,降低配電網運行的風險。最後分析瞭節點參與因子對風電機選阯的影響,數值分析的結果錶明將風電機安裝在負荷節點參與因子較大的地方可以進一步降低配電網運行的風險,使得繫統各箇節點電壓分佈更加均勻,同時能夠給繫統運行留齣更多裕量。
문장침대풍전접입배전망시고필전압은정성적무공우화진행연구。이용다장경기술대풍전궤적출력진행건모,재계급부하파동적정황하,대배전망채용몽특잡락방법진행수궤조류계산,구득절점전압、풍전궤무공출력등변량적기망여표준차;연후이용련속조류여전개솔공식계산다장경하풍궤접입적전압은정유도기망。재차기출상이용유전산법대배전망진행무공보상우화투절,IEEE33계통적계산결과표명해방법가이개선배전망무공분포,제고전압수평,강저배전망운행적풍험。최후분석료절점삼여인자대풍전궤선지적영향,수치분석적결과표명장풍전궤안장재부하절점삼여인자교대적지방가이진일보강저배전망운행적풍험,사득계통각개절점전압분포경가균균,동시능구급계통운행류출경다유량。
Considering the voltage stability in the distribution network ,an optimal reactive power dispatch method with wind power integration is proposed .Multi-condition modeling is used to simulate the output of wind power .The expectation and standard deviation of state variables like bus voltage and reactive output of wind power generator under fluctuated load condition are gotten by using stochastic power flow based on Monte Carlo simulation .Then the continuous power flow and total probability formula are employed to obtain the average load margin of wind power generator integration under multi-condition .On this basis ,a genetic algorithm based optimal reactive dispatch method is employed .T he numerical results of IEEE 33 system dem-onstrate that this method can optimize the reactive power dispatch on distribution network and it is able to im -prove voltage stability and decrease the risk of operation .Finally ,the effect of the bus participation factor on the location of distributed wind power generator is analyzed .The results of numerical analysis suggest that , when the wind power generators are connected to load buses with relatively larger participation factor ,the risk of operation will decrease and the margin of system operation will increase ,and the bus voltage distribution will be more regular .