配电网中光伏功率主动削减策略研究  

Output curtailment strategy of photovoltaic generation system

作　　者：王力成[1] 文东山 周斌[2] 刘佳[2] 郭创新[1] 

机构地区：[1]浙江大学电气工程学院,浙江杭州310027 [2]国网重庆市电力公司检修分公司,重庆400039

出　　处：《机电工程》2015年第6期863-867,877,共6页Journal of Mechanical & Electrical Engineering

基　　金：国家自然科学基金资助项目(51177143);浙江省自然科学基金资助项目(LZ12E07002);国家重点基础研究计划(973计划)资助项目(2013CB228206)

摘　　要：针对夏季正午由大量光伏功率注入配电网所带来的节点电压、线路潮流越限的问题,提出了一种通过实时计算和削减分布式光伏发电系统功率输出的主动控制方法来限制配电网中光伏功率注入量,从而避免配电网中越限事故的发生。首先给出光伏出力削减的数学优化模型,该模型以实时气象条件为基础计算光伏发电系统潜在的最大输出功率,并通过最优潮流模型结合配电网各个节点的负荷水平计算得到该时刻连接于各个节点的光伏发电系统的最大允许出力上限值。在此基础上,又设计了一种DC/DC变换器的电流控制策略。通过该控制策略,可以使光伏发电系统的出力在不同的光照条件下均不超过计算所得的最大允许出力上限。最后通过IEEE33节点模型进行算例分析。研究结果表明,所提出的光伏功率主动削减策略可以避免配电网中越限事故的发生。Aiming at avoiding problems such as voltage and power flow off-limits in distribution network caused by large amount of active power injection generated by large scale of photovohaic （PV） generators during summer noon, a photovohaic output curtailment strategy that can limit the amount of injection active power was proposed. Firstly, a PV output curtailment model was established, through which the maximum allowable output power of PV generators connected in specific nodes could be obtained. On this basis, the maximum allowable output power was transmitted to the controller which is in charge of limiting the output power of PV generators in periods when the insolation is very large. Finally, an example was presented using IEEE33 nodes system. The results indicate that the method proposed is feasible.

关 键 词：光伏削减 配电网 调度 最优潮流 

分 类 号：TM7[电气工程—电力系统及自动化]