Research on the Dual PWM Converter Based on the Power Output of Microturbine

　　Research on the Dual PWM Converter Based on the Power Output of Microturbine
　　This paper studies the power conversion of the power output of the combined cooling heating and power (CCHP) system based on microturbine. Considering the characteristic of this system, this paper proposes the dual PWM converter system will be applied to the system above. This dual PWM converter system can rectify the high-frequence AC generated by permament magnetic generator drived by the microturbine to stable high-quality DC ,then the DC will be directly transformed to three-phase AC for loads or grid-connected generation.
　　Firstly, this paper systematicly expounds the basic principles, mathematics model, calculation of the main circuit parameters of three-phase voltage source neodymium standard state PWM rectifier (for short 3-phase VSR) and the design of the control system, and then establishes the simulation model of the 3-phase VSR system and 3-phase PWM inverter, and also that of dual PWM converter system. The results of those simulations are illastrated and analyzed, and prove that the dual PWM converter system satisfies the expected request.Fist of all, this paper studies 3-phase VSR, and puts forward the SVPWM control algorithm’s voltage oriented control strategy will be applied to the system, and analyses and calculates the SVPWM algorithm thoroughly.Then, combined 3-phase VSR and 3-phase PWM inverter, the dual PWM converter system is brought up. At last, this paper respectively reserchs the simulations of 3-phase VSR system, 3-phase PWM inverter system and the dual PWM converter system using MATLAB 7.0.Considering the request of the CCHP system for power transformation, this paper brings up the current feed-forward and double loop-closed decoupling http://www.999magnet.com/products/112-neodymium-standard-state control frame and the space vector pulse width modulation algorithm which is easily digital realized, reduces the harmonic currents of the rectifier AC side, minimizes the ripple DC voltage and improves the performance of dynamic response. The simulation models of SVPWM algorithm, 3-phase VSR system, 3-phase PWM inverter system and the dual PWM converter system are established using Matlab7.0/Simulink6.0. Through the further research of rectification simulatin model, a series simulation datas are obtained for studying the relationship between the circuit parameters, controls parameters and the system performance. The simulation result indicates that the dual PWM converter has a favorable steady state and dynamic response, validates the correctness of theoretical analysis, satisfies the expected request, and provides a good foundation for the practical engineering application.