Basic Theoretical Research Of Matrix Converter Embedding Boost Circuit (BoostMC)

Because of good sinusoid PWM waveform of input current and output voltage, adjustable input power factor, compact configuration, high efficiency and low harmonic, Matrix Converter(MC) becomes study focus nowadays.The input of AC-DC-AC MC adopts matrix rectifying, and the output adopts common PWM inversion, which are controlled respectively. To some degrees it can overcome the shortage of conditional MC, however, the problem of low voltage transfer ratio couldn't be settled due to its limit of topology itself. In the basis of theory analysis, the maximum voltage transfer ratio is 0.866, when adopting dual-voltage space vector method and input power factor is 1, which restricts its application need voltage transfer ratio being 1 for example motor transmission. Contraposing to this problem, some researches and experts raised several control strategies such as overmodulation and harmonic injection, in order to increase voltage transfer ratio of MC to 1.0. But they weren't good for application due to those high harmonic outputs.The comparability of new MC embedding Boost circuit is compared with conditional AC-DC-AC MC base on its topology. The main circuit and parameters are determined by means of studying its topology and the equality circuit. Harmonics of rectifier, boost circuit and inverter three parts are analyzed respectively. The relationship between high frequent components of switch function and those of Boost MC input current is analysis. The math model of Boost MC based on dq reference frame is constructed, and the controllability, observability and stabilization are analyzed by numerical method. The infection on system caused by capacitor and inductor parameters, the variety rule between the main performance indexes of voltage transfer ratio, output voltage total harmonic distortion and circuit and control parameters are studied, in virtue of theory harvest of MC and Boost inverter. The validity and feasibility of voltage transfer ratio and control strategies are tested by simulation. Experimental sample device is designed, so as to provide inspiration for these novel MCs further engineering application.