新能源直流并网逆变器双环控制算法仿真

Simulation of Double-Loop Control Algorithm for New Energy DC Grid-Connected Inverter

针对当前相关研究成果存在响应延迟高和稳定性较差的问题,提出基于电感电流反馈的新能源直流并网逆变器双环控制算法。简析逆变系统中的干扰项,并构建尖峰脉冲频谱函数。引入LC低通滤波器,对滤波器的关键参数进行设计,实现滤波器优化。将尖峰脉冲谐波干扰输入至滤波器中,实现逆变器初步干扰抑制。依据初步控制结果,利用电感电流反馈控制方式进一步控制逆变器输出波形。其中,双环控制通过输出电压解耦以及输出电流回馈实现扰动消除,并根据对内外环中比例参数进行整定获取较为理想的逆变器输出波形,完成整体控制。实验结果显示,上述算法响应速度快,且具备很强的稳定性,可作为一种鲁棒性强的逆变器控制算法开展应用。

Due to high response delay and poor stability of current research results, this paper presented a dual-loop control algorithm for new energy DC grid-connected inverter based on inductive current feedback. Firstly, the interference term in the inverter system was briefly analyzed and the peak pulse spectrum function was constructed. Secondly, LC low-pass filter was introduced to design the key parameters of filter and optimize the filter. The spike pulse harmonic interference was input into the filter to achieve the preliminary interference suppression of inverter. According to the preliminary control result, the output waveform of inverter was further controlled by inductive current feedback control. The dual-loop control achieved the disturbance elimination by decoupling the output voltage and feeding back the output current. The ideal output waveform of inverter was obtained by adjusting the proportional parameters in inner loop and outer loop. Thus, the overall control was completed. Simulation results show that the proposed algorithm has fast response speed and strong stability, which can be used as an inverter control algorithm with strong robustness.