光伏并网系统参与电压调节的有功和无功协调控制策略研究  

Research on active and reactive power coordination control strategy of PV grid-connected system for voltage regulation

作　　者：王宁[1] 高朋[1,2] 贾清泉 孙玲玲[1] 白钰[3] WANG Ning GAO Peng JIA Qing-quan SUN Ling-ling BAI Yu(Key Lab of Power Electronics for Energy Conservation and Motor Drive of Hebei Province, Yanshan University, Qinhuangdao 066004, China State Grid Hebei Electric Power Company Shijiazhuang Power Supply Branch, Shijiazhuang 050093, China State Grid Hebei Electric Power Company Yuanshi Power Supply Branch, Shijiazhuang 051130, China)

机构地区：[1]电力电子节能与传动控制河北省重点实验室燕山大学,河北秦皇岛066004 [2]国网河北省电力公司石家庄供电分公司,河北石家庄050093 [3]国网河北省电力公司元氏县供电分公司,河北石家庄051130

出　　处：《电工电能新技术》2017年第8期23-29,共7页Advanced Technology of Electrical Engineering and Energy

基　　金：国家自然科学基金项目(51607153);河北省自然科学基金项目(E2016203268);河北省教育厅科研项目(QN2015124)

摘　　要：针对配电网线路阻抗大、分布式光伏并网系统无功调压能力有限,导致光伏电源在有功出力较大时并网点(PCC)电压越上限问题,在深入分析光伏系统PCC电压特性基础上,提出一种光伏逆变器有功和无功协调控制策略。在该控制策略下,光伏系统实时跟踪监测PCC电压变化,PCC电压不越限时,逆变器按最大功率点跟踪(MPPT)输出;PCC电压越上限时,优先利用逆变器剩余容量进行无功调压,若剩余容量不足,调节逆变器有功输出,并动态计算有功、无功最佳输出值,保证将PCC电压调节至满足要求的前提下,实现逆变器有功输出最大化、无功输出最佳化。算例结果验证了控制策略的有效性。The impedance of the distribution network is large,the reactive power voltage regulation of the distributed PV grid-connected system is weak,so the voltage of point of common coupling exceeds the upper limit when the active power is larger than PV power supply. Based on the analysis of the PCC voltage characteristics of PV system,the active and reactive power coordination control strategy of PV inverter is proposed in this paper. In this control strategy,the voltage of PCC is tracked by PV system in real time. When the voltage of PCC is normal,the inverter will output in the way of maximum power point tracking（ MPPT）. When the voltage of PCC exceeds the upper limit,the inverter will regulate the voltage by using the remaining capacity preferentially. If the remaining capacity is insufficient,the inverter will adjust active output and dynamically calculate the active and reactive best output values. In this way,the voltage of PCC is adjusted in a appropriate range to achieve the active output maximization and reactive output optimization of inverter. The results of the example verify the effectiveness of the control strategy.

关 键 词：光伏并网系统 电压越限 有功和无功协调控制策略 逆变器剩余容量 

分 类 号：TM464[电气工程—电器]