摘要
针对分布式电源并网运行时存在谐波干扰及并联运行时分布式电源之间的相位差会导致环流影响系统安全性等问题,对分布式电源中Z源逆变器的锁相方法进行了研究。通过对Z源型逆变器拓扑结构和空间矢量正弦波调制方法的分析,在DSP加FPGA控制平台实现对最大功率跟踪和电压电流幅度控制的基础上,提出了一种同时利用软件过零信号和硬件过零信号的数字锁相方法。该数字锁相环通过FPGA实现,可以提高分布式电源中Z源逆变器锁频锁相的稳定性和准确性。经过分布式电源实验平台验证,证明了这种锁相方法的可靠性。
When distributed generation is connected to the grid, harmonic interference occurs. The phase difference between the generations can cause circulation which affects the system security. To solve the above problems, the phase locking method for Z-source inverter is studied. Z-source inverter topology and SVPWM modulation are analyzed, based on achieving maximum power tracking and voltage current amplitude control on DSP and FPGA control platform, a digital phase locking method using both software zero-crossing signal and hardware zero-crossing signal is proposed. This digital PLL is achieved in the FPGA, which can improve the phase locking stability and accuracy of Z-source inverter used in distributed generation. Through the distributed generation experimental platform, the reliability of this phase locking method is verified.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2012年第17期46-50,共5页
Power System Protection and Control
基金
天津市重点基础研究基金(11JCZDJC22900)
