摘要
在大规模新能源并网发电场合,电网常会出现电压跌落、频率突变、谐波污染等故障,给并网逆变器的运行控制提出了较高的要求。因此,需要采用更高性能的锁相(频)环技术实现故障情况下电网同步,增强并网逆变器的并网控制性能。提出一种基于降阶谐振调节器的锁频环(frequency-locked loop based on reduced order resonant controller,ROR-FLL)技术,频率自适应能够通过简单的反馈控制环节实现。ROR-FLL能够快速精确的从非理想正弦电压中分离出正序、负序、谐波分量,且其实现比较灵活、简单。仿真和实验结果验证了该锁频环的可行性及动态性能。
There are many faults happened at renewable energy generation systems, such as voltage dip, frequency change, harmonic distortion and so on, which demands for higher performance of grid-connected inverters （GCI）. Therefore it is necessary to use better phase-locked loop （PLL）or frequency-locked loop （FLL） technologies to synchronize at the fault condition, and the control performance of GCI can be improved. This paper proposes a novel frequency-locked loop technology based on the reduced order resonant controller （ROR-FLL）, and it is frequency-adaptive by using the easy feedback control unit. ROR-FLL can accurately and rapidly extract the positive-negative sequences and harmonic components from the polluted grid voltage, and it is easy to realize. Results show its feasibility and excellent transient performance.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2013年第15期38-44,17,共7页
Proceedings of the CSEE
基金
国家科技支撑计划资助项目(2007BAA12B04)~~
关键词
并网逆变器
降阶谐振调节器
正负序分离
锁频环
grid-connected inverter
reduced order resonant controller
positive/negative-sequence separation
frequency-locked loop
