一种单相并网逆变器的控制策略的研究

Research on a Control Strategy for Sirgle-Phase Grid-Connected Inverter

单相并网逆变器的控制部分是逆变器设计的重点,传统的PI控制算法下的并网电流与电压存在相位差,在电流较小时相位差比较严重,导致逆变器输出功率因数较低等问题。对单相并网逆变器进行了仿真,提出了基于电压电流双环控制的控制方法,并对其进行仿真验证.实验结果表明,电压电流双环控制的控制方法在一定程度上控制输出电压波形,有效的改善并网电流波形,控制精度较好,可以提高逆变器的输出电能质量,同时可保证逆变器输出电流与电网电压同频同相。

Single-phase grid inverter control part is the focus of the design of our inverter, the traditional PI control algorithm of parallel in current and voltage phase difference existing in current more hours phase differ- ence is more serious, resulting in inverter output power factor lower problem. In this paper, the single phase grid inverter are simulated, proposed based on voltage current 2-ring control method, and carries on the simula- tion verification. The experimental results show that, the voltage current 2-ring control method in a certain ex- tent control output voltage waveform, effective improve grid current waveform, the control precision is good, can improve the inverter output power quality, and at the same time can ensure the inverter output current and pow- er ~rid voltage and freauencv in phase.