Constant Voltage Control for Reverse H3I Matrix Converter and the Design of the Voltage Regulator

Operating hybrid active third-harmonic injection matrix converter (H3IMC) in reverse mode is one of competitive choices to boost the input AC voltage, for no bulky energy storage element or auxiliary circuit is needed. However, unlike the forward mode, proper controls of both the output and input sides are required for reverse H3IMC. Based on the mathematical model of the reverse H3IMC system, a double closed-loop control strategy is proposed in this paper, by which load voltage and input current are both under control. By this strategy, satisfying load voltage and input current can be still achieved even under light load condition, which has been proved to be difficult for reverse traditional indirect matrix converter (IMC). For better feasibility, the design of the PI regulator for the outer voltage loop control is included by limiting the value ranges of PI parameters Kp and Ki in this paper. In the end, experimental results verify the validity of the proposed double closed-loop control strategy and the range of PI parameters of the voltage loop control.