Simulation Research Of The Three-phase High Power Factor Reversible Rectifier

With the development of modern power electronics technology, the battery charger is playing an increasingly important role in the daily economic life. Most of the conventional battery charging devices using thyristor rectifier, but the network power factor is low, and the net distortion of the grid side current harmonic pollution have become serious, and operating frequency is low, charging device bulky, two-way flow of energy can not be achieved, Lower energy transfer efficiency. This paper designs a three-phase voltage space vector pulse width modulation (Space Voltage Vector Pulse Width Modulation, SVPWM) reversible rectifier.The network side of the rectifier can achieve unity power factor, input current waveform quality is good, the DC output voltage is stable, rectifier and inverter with a dual function. Paper follows the work:Firstly, in this paper, the way to realise high power factor rectifier analyzed by means of single-phase and three phase voltage PWM reversible rectifier topology and operating principle, respectively, in three-phase stationary coordinate system and two-phase rotating coordinate system established mathematical reversible rectifier Model. Abc coordinate transformation module implements the three-phase stationary coordinate system and the dq two-phase rotating coordinates the mutual transformation, on the one hand to meet the needs of the control algorithm, on the other hand to provide a dq coordinate system through the direct flow of the abc coordinate system Volume under the three-phase analysis method.Secondly, analysis of three-phase reversible PWM rectifier control strategy for three-phase voltage-type reversible rectifiers control system of the actual demand, the introduction of feed-forward decoupling based on double closed-loop control strategy. Analysis of the traditional SVPWM algorithm is based on the hardware in order to save space, given the simplified SVPWM algorithm.Thirdly, the analysis is based on feed-forward decoupling double-loop control system strategy designed SVPWM phase voltage main circuit parameters and reversible rectifier control system parameters. Because the AC network voltage and current noise exists acquisition, So setting FIR filters to improve system stability. Basing on the actual grid voltage waveform due to different factors there will be some distortions in the traditional hardware and single-phase digital lock-lock When the grid voltage and frequency drift, can not be locked quickly and accurately input current phase problem, designed a new type of three-phase coordinate transformation phase-locked loop, given the principles of analysis and mathematical model for reversible realization of high power factor rectifier provides a Kinds of new solutions.Fouthly, to build based on double closed-loop feed-forward decoupling control modeI in Matlab/Simulink, constructed based on coordinate transformation of the digital PLL model and the simplified SVPWM modulation model building. Continuous domain system simulation to study the dynamics, steady-state and anti-interference performance, verify the theoretical correctness of the algorithm.Finaly discrete reversible rectifier control system domain mode is built based on VHS-ADC high-speed digital signal processing platform, Parts of the system model are constructed enriched Matlab toolbox. Discrete domain system simulation results show that: the rectifier can be to achieve network high power factor, good quality of network current waveforms, stable DC output voltage, and the power can flow from DC to AC or AC to DC.