Voltage-source PWM (Pulse Width Modulation) rectifier can provide constant DC bus voltage and suppress harmonic distortion of grid-side currents. It also has power feedback capability and has a broad prospect in the field of DC power supply [1], reactive power compensation, active filtering and motor control system. This dissertation studies the theory and implementation of PWM rectifier and completes the following tasks: 1. Analyze three-phase voltage-source PWM rectifier (VSR), including its topology, mathematical model and principle. Derive Clarke transformation and Park transformation and analyze the mathematical model in the two-phase αβ stationary coordinate and dq rotating coordinate. 2. Make a detailed analysis on the principle and characteristics of Direct Power Control (DPC) strategy and Model Predictive Control (MPC) strategy and study the instantaneous active power and reactive power flow in the rectifier. 3. Based on the principle of traditional switching table of DPC, an improved table is proposed. Then this project presents a further improved switching table to achieve better control performance and the simulation model in Matlab/Simulink environment is established to verify the algorithm of voltage-oriented direct power control strategy. 4. Based on different strategy studies and the simulation results from DPC system, propose our model predictive control (MPC) algorithm. 5. Analyze the modulation principle of the space vector pulse width modulation (SVPWM). 6. Build the MPC-SVPWM model in Matlab/Simulink to verify our MPC algorithm. 7. The simulation result shows that MPC-SVPWM performs better in harmonic suppression, unity power factor, DC output voltage ripple coefficient and dynamic response than DPC. Key words: PWM rectifier, unity power factor, direct power control, model predictive control,
LINK
http://www.diva-portal.org/smash/get/diva2:566308/FULLTEXT01.pdf
