考虑动态频率约束的含高渗透率光伏电源的孤立电网机组组合  

Isolated Grid Unit Commitment with Dynamic Frequency Constraint Considering Photovoltaic Power Plants Participating in Frequency Regulation

作　　者：叶婧[1,2] 林涛[1,2] 张磊[3] 毕如玉[1,2] 徐遐龄 Ye Jing;Lin Tao;Zhang Lei;Bi Ruyu;Xu Xialing(School of Electrical Engineering Wuhan University Wuhan 430072 China;Collabrative Innovation Center for High-Efficient of Solar Energy Wuhan 430077 China;School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China;Central China Electric Power Dispatching and Communication Centre Wuhan 430077 China)

机构地区：[1]武汉大学电气工程学院,武汉430072 [2]太阳能高效利用湖北省协同创新中心,武汉430077 [3]华中科技大学电气与电子工程学院,武汉430074 [4]华中电力调控分中心,武汉430077

出　　处：《电工技术学报》2017年第13期194-202,共9页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金重大项目(51190105);国家自然科学基金(51177111);太阳能高效利用湖北省协同创新中心重大专项(HBSZD2014003)资助

摘　　要：孤立电网具有低惯性及一次调频能力弱的特点,高渗透光伏接入孤立电网后会进一步降低孤立电网惯性及其调频能力。为了保障系统有充足的频率响应能力,本文在UC中考虑动态频率约束,并且通过光伏电源减出力参与调频来增强系统的调频能力。推导考虑光伏电源调频情况下,系统发生故障时最大频降、最大频降出现时间的表达式。基于此,推导了光伏的最小调频容量表达式,用以限制UC在优化过程留有充足但不过量的光伏电源调频容量。根据以上推导建立考虑动态频率约束的含高渗透率光伏电源的孤立电网UC优化模型。针对所提的混合整数非线性优化模型,采用产生Benders割以及优化割的方法来降低问题的求解复杂度。最后采用含高渗透率光伏电源的孤立电网算例进行测试,结果表明所提模型能够兼具安全性和经济性,测试过程也表明了所提求解方法的有效性及优越性。Isolated grid(IG)usually has small inertia constant and limited ability of primaryfrequency regulation.In addition,high penetration level of photovoltaic power plants(PV-PPS)integrated to IG will deteriorate system inertia and primary frequency regulation ability.To ensure thestability of frequency,unit commitment(UC)model considering dynamic frequency limit(DFL)wasproposed in this paper,and PV-PPS were deloaded to participate in frequency regulation.Based onfrequency response model with PV-PPS participating in frequency regulation,the expression of required minimum frequency regulation capacity of PV-PPS was deduced,which guided PV-PPS retainsufficient but not excessive capacity.Then,taken DFL into consideration,a UC model with frequencyregulation capacity of PV-PPS was proposed.In order to avoid complex solving procedure,theoptimization cut and benders cut were used for eliminating frequency limit/regulation capacityviolations in iteration method.The results indicate that security and economy can be achieved by theproposed scheme.

关 键 词：孤立电网 机组组合 动态频率 光伏发电 Benders 分解 

分 类 号：TM732[电气工程—电力系统及自动化]