摘要
将下垂控制应用于逆变器电压型并网控制系统中,可以实现逆变器在孤岛和并网两种运行模式间无缝切换。针对低压电力线的阻抗特点,提出新型光伏逆变器电压型并网控制策略。在阻性下垂控制的基础上增加功率环和直流母线电压环,解决电压控制型逆变器并网功率易受电网波动影响等问题,增强了光伏逆变器对功率的控制能力,满足始终以最大有功功率并网和维持直流母线电压稳定的要求。实验结果验证了所提控制方法的有效性。
Droop control is used in PV inverter system, which can achieve seamless switching between grid-connected mode and islanded mode. According to the characteristic impedance of low-voltage electrical wires, a novel voltage-controlled method for grid-connected PV inverter is proposed in this paper. By adding a power loop and a DC-link voltage loop to droop control, the power of inverter cannot be influenced by grid fluctuation, the power control ability of PV inverter is strengthened, PV inverter can output maximum active power into grid and the dc-bus voltage is stable. The validity of the proposed method is verified by experimental results.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2015年第21期5560-5568,共9页
Proceedings of the CSEE
基金
国家自然科学基金项目(51207032)
台达环境与教育基金会<电力电子科教发展计划>(DREK2013003)
中央高校基本科研业务费专项资金项目(HIT.NSRIF.2013019)~~
关键词
光伏并网逆变器
电压型控制
下垂控制
无功功率
有功功率
最大功率跟踪
grid-connected photovoltaic（PV） inverter
voltage-controlled method
droop control
reactive power
active power
maximum power point tracking（MPPT）
