减少矩阵变换器输出电压谐波的控制策略

在传统的双电压合成原理的基础上，提出了一种减少输出电压谐波的矩阵变换器控制策略.新调制策略在一个采样周期内，通过在高输出电压时，使最大输出线电压由三输入线电压脉冲波形成，其他两相输出电压由非最大的两输入线电压脉冲波和零电压形成，同样条件下窄脉冲数量较传统的双电压合成调制策略减少；在低电压输出时，三输出线电压均由非最大的两输入线电压脉冲和零电压形成，较传统的双电压合成调制策略窄脉冲数量有大量的减少，输出电压谐波得到较大的抑制；在输入电压的最高及最低相电压间无换流，降低了开关损失；低电压输出时的零矢量为输入相电压的中间值相，负载中性点的共模电压得到了抑制.在Matlab软件仿真研究的基础上，通过dSPACE硬件实时仿真平台对该控制策略进行了实验，仿真及实验结果验证了该控制策略的正确性.

Control strategy of matrix converter for reducing output voltage harmonics

Presented a control scheme of matrix converter for reducing output voltage harmonics based on conventional two-line voltage synthesis.The maximum output line-line voltage is formed by three input line-line voltage pulses,while the other two output line-line voltage are synthesized by non-maximum two input line-line voltage pulses and zero voltage within a sampling cycle when the output voltage is high.The number of narrow pulse is smaller than that of the traditional two-line voltage synthesis on the uniform conditions.The three output line-line voltage are formed by non-maximum two input line-line voltage pulses and zero voltage when the output voltage is low,which reducing the narrow pulses and output voltage harmonics significantly compared with conventional two-line voltage synthesis.The switching loss is reduced by no commutation between the highest and lowest input voltages.The zero vector is the middle input voltage in low output voltage,common-mode voltage in the neutral-point of the load is reduced.The model of the control system was established,the simulation analysis and experiments were taken with Matlab tools and the platform of dSPACE hardware real time simulation.The results of simulation and experiments show the effectiveness of the proposed control strategy.