Research On Novel Matrix Converter With DC Output Ability Used For Variable Speed Constant Frequency Power System

Matrix converter (MC) is a novel AC-AC power converter with no inter DC link. More and moreattention is focused on MC because of its advantages, such as unit power factor, sinusoidal inputcurrents and output voltages, and easy realization of bi-directional flow of energy. This thesis studies avariable-speed constant-frequency (VSCF) generation system based on a novel MC, which combinesthe generator excitation circuit with the main power circuit by adding a DC output bridge leg.The topology and mathematical model of the novel MC is introduced firstly. After studying thespace vector modulation of MC AC output legs, a novel DC output modulation strategy for the DC legis proposed and analyzed in detail.In order to improve the quality of the output power, a closed-loop method for the generationsystem based on the novel MC is proposed. Through the integration modulation of the novel MC,generator excitation current and system output power can be under control at the same time. TheMATLAB/Simulink model of the VSCF generation system is constructed. The validity and thefeasibility of the novel MC topology, modulation strategy and the system control strategy are verifiedby simulation results.Finally, the practical implementation of MC is discussed and a MC prototype is built. The controlmethod is carried out in DSP and CPLD. The bidirectional switch cell arrangement is consist of towRB-IGBTs connected in anti-parallel. The hardware and software design is given. A series ofexperiments have been made and the experiment results are obtained on the prototype, which provethat the theories and analysis are correct.