摘要
为了降低分布式电源并网时输出的谐波电流,针对并网逆变器控制系统和电网谐波源的特性,给出一种分布式电源谐波补偿方法.采用基于同步采样序列的FFT算法实现在线谐波测量,设计包含电压谐波前馈和电流谐波反馈的谐波控制器计算补偿信号,通过调整逆变桥的SVPWM调制波形实现了谐波补偿.利用该方法在5 kw分布式电源实验平台实验,对并网运行条件下谐波补偿的效果进行了测试.实验结果表明,该方法在线谐波测量结果准确,谐波控制器计算的补偿信号作用于系统可以有效降低并网电流的谐波含量.
In order to reduce the harmonic current sent to the grid, by studying the control system of grid-connected inverter and the characteristics of grid harmonic source, a harmonic compensation method for distributed generation has been proposed. Using the FFT algorithm based on the synchronous sampling se- quence, a harmonic controller including voltage harmonic feedforward and current harmonic feedback is designed to calculate the compensation signal, and harmonic compensation is realized by adjusting the SVPWM modula- tion waveform of the inverter bridge. This method has been experimented in 5kw distributed generation experi- mental platform, and the harmonic compensation effect on the condition of connecting to the grid has been test- ed. Experimental result proves this method is practical and effective, the harmonic analysis result is accurate, and the compensation signal calculated by the harmonic controller acting on the system can effectively reduce the harmonic content of the grid current.
出处
《南开大学学报（自然科学版）》
CAS
CSCD
北大核心
2015年第2期92-98,共7页
Acta Scientiarum Naturalium Universitatis Nankaiensis
