摘要
针对光伏发电系统通常以单位功率因数运行,造成故障时光伏并网逆变器一定视在功率浪费的现状,提出一种低电压穿越无功控制策略。分析光伏并网逆变器的有功、无功功率解耦控制和其无功功率输出极限,建立光伏逆变器无功功率输出与并网点电压跌落的关系,通过比较故障前光伏阵列发出有功功率与光伏逆变器允许输出最大有功功率,确定光伏发电系统在低电压穿越过程以最大功率模式运行或者以非最大功率模式运行。利用RTDS软件搭建仿真算例,验证该低电压穿越无功控制策略的可行性。
Aiming to the present condition that the photovoltaic(PV)generation system operating in general under condition of unity power factor which leads to the waste of a certain quantity of apparent power waste in the gridconnection inverters of the PV generation system,a reactive power control strategy during the low-voltage ride-through(LVRT)of PV generation system is proposed.The decoupling of active and reactive power in grid-connection inverter of PV generation system and its output limit of reactive power are analyzed and the relation between the reactive power output of the inverter of PV generation system and the voltage droop at the grid-connection point is established.And then through comparing the active power generated by PV array before the fault with the allowed maximum active power output of the PV inverter to determine whether the PV generation system operates by the maximum power point tracking(MPPT)mode or by the non-MPPT mode during the LVRT can be determined.A simulation platform is constructed by RTDS software to validate the proposed reactive power control strategy in the LVRT,and simulation results show that the proposed control strategy is feasible.
作者
解吉蔷
杨秀
王巨波
Xie Jiqiang;Yang Xiu;Wang Jubo(School of Power Engineering,Shanghai University of Electric Power,Shanghai 200090,China;State Grid Shanghai Electric Power Company Urban Power Supply Company,Shanghai 200080,China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2019年第12期3426-3434,共9页
Acta Energiae Solaris Sinica
基金
国家自然科学基金（51407114）
关键词
光伏逆变器
低电压穿越
无功控制
最大功率跟踪
实时数字仿真
photovoltaic inverter
low voltage ride through
reactive power control
maximum power point tracking
real time digital simulation
作者简介
通信作者:解吉蔷(1992-),女,硕士研究生,主要从事光伏发电系统低电压穿越控制策略方面的研究。1575567532@qq.com。
