矩阵变换器双电压闭环控制策略改进研究

Research on Closed-loop Control of Matrix Converter With Double Voltage Control

针对采用双电压合成控制的矩阵变换器(MC),研究设计一种新型闭环控制策略。该闭环控制策略依据双电压控制的MC占空比计算特性,计算得到理想输入电压占空比与等效输入电压占空比的偏差,将计算得到的电压占空比偏差作为闭环系统的负反馈变量加到下一个占空比计算周期内,以此达到闭环控制的目的。利用提出的闭环控制策略,解决MC输出侧电压性能受输入侧电压畸变以及MC内部器件性能不理想等因素的影响,保证MC的实际输出电压更好地达到期望电压,改善其受到扰动后输出电压质量降低情况,提高输出性能。实验结果表明:采用此新型闭环控制方法的MC输出电压更加接近期望电压,输出电流波形更加平滑,输出电压质量更加理想。

A novel closed-loop control strategy is designed and researched for a matrix eonverter(MC)with dual voltage synthesis control.The closed-loop control strategy is based on the dual-voltage control of the MC duty cycle calculation characteristics,the deviation between the ideal input voltage duty cycle and the equivalent input voltage duty cycle is calculated,and the calculated deviation is added as the negative feedback variable of the closed loop system to the next duty cycle calculation period.In order to achieve the purpose of closed-loop control.The closed-loop control strategy proposed is used to solve the problem that the output side voltage performance of the MC is affected by the input side voltage distortion,and the performance of the internal components of the MC is not ideal.To ensure that the actual output voltage of the MC to better meet the desired voltage,improved its disturbance after the output voltage quality reduction,improve the output performance.The experimental results show that the output voltage of the MC with this new closed-loop control method is closer to the desired voltage,the output current waveform is smoother and the output voltage quality is more ideal.