矩阵变换器双电压调制策略的简化控制

Simplified Control under Dual-voltage Modulation Strategy for Matrix Converter

针对矩阵变换器传统双电压调制策略存在的扇区随机组合,导致占空比的不确定问题,提出把输入和输出电压区间由6个分成为3个。推导了新方法下输出线电压的通用数学表达式,在新模式下通过输入不平衡的三相电压,验证新的扇区划分方法仍然具有对电网扰动的抵抗能力。该方法简化了软硬件的控制过程,在原理方法上和传统的调制策略等效,在输入输出特性上差异很小。最后通过实验样机平台,用实验的方法验证了新模式的可行性。

Considering the uncertainties of duty cycle resulting from the random combination of sectors under the traditional dual-voltage modulation strategy for matrix converter,the input and output voltage ranges are divided into 6 sectors instead of 3. The general mathematical expressions of output line voltage are derived using the new method. In thenew mode,by inputting unbalanced three-phase voltage,it is verified that the new sector classification method still hasthe capability to resist disturbances in power grid. This method simplifies the process control of hardware and software,and it is equivalent to the traditional modulation strategy in principle;moreover,the differences in the input and output characteristics are small. Finally,the feasibility of the new mode was experimentally verified on a platform with a prototype.