矩阵变换器双电压控制策略抗干扰性能分析

The anti-interference effectiveness analysis of matrix converter based on double line-to-line voltage synthesis

与传统的交-直-交变换器不同,矩阵变换器没有中间的直流环节,输出侧直接通过双向开关与输入侧相连,因此输出电压对于输入侧电源的扰动非常敏感。分析了矩阵变换器双电压合成控制策略的原理,详细推导了在输入侧电源存在不平衡以及谐波情况下,输出侧仍然为理想正弦波。通过Matlab/Simulink仿真,证明了在输入侧电源存在三相不平衡以及谐波等扰动情况下,输出电流波形仍然为理想的正弦波且电流谐波畸变率没有发生大的变化。仿真和推导表明,矩阵变换器双电压合成策略对电网扰动具有抗干扰能力。

Compared with the traditional AC-DC-AC converter, matrix convener（MC ）doesn＇t have the DC link and the output lines are directly connected to the input lines by bi-directional switches. Therefore, the output voltage is greatly sensitive to the disturbance of input supply source. The principle of double line-to-line voltage synthesis control strategy of matrix converter is analyzed and the condition is amply reasoned out that the output waveform is still sine wave even if there exists three-phase unbalance or harmonic in the input supply source. The current harmonic distortion rate nearly has no change through the Matlab/Simulink simulation. The simulation results show that double line-to-line voltage synthesis strategy has the anti-interference ability to the power network disturbance.