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Dual-PWM Converter Control Strategy Research and the System Design

Author: XuMiaoZuo
Tutor: ZhengZheng
School: Henan Polytechnic University
Course: Control Theory and Control Engineering
Keywords: Direct Power Virtual flux Dual PWM inverter PI regulator
CLC: TM461
Type: Master's thesis
Year: 2009
Downloads: 234
Quote: 1
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Abstract


Diodes, thyristors , etc. are not controllable, because the traditional inverter rectifier with the phased switching device , the current harmonics of the network side is a large , low power factor , resulting in power pollution , energy can not be feedback network , in the working condition of the motor braking operation , waste lot of power. Dual PWM inverter In view of this situation . Full-controlled switching device IGBT rectifier part of the dual - PWM inverter using PWM modulation , the grid-side current nearly sinusoidal , the power factor of the network side , and to achieve the two-way flow of energy . This topic first studied dual PWM inverter topology , work , to be compared with the conventional inverter , pointed out that the strength of the double PWM converter . Dual PWM inverter topology rectifier part inverter part of the analysis , a part of the control strategy of the main rectifier inverter part of the control strategy has been more mature in this article . Rectifier part of the direct power of the the voltage outer , inner power loop control system , this paper first analyzes the mathematical model of the three-phase voltage -type PWM rectifier abc, αβ and dq coordinates for traditional direct power control strategy in the switching frequency is not fixed high switching frequency shortcomings of the space vector method to improve the power hysteresis the switch table brought these shortcomings ; for traditional direct power control strategy in the network side of the harmonic content , vulnerable to the interference of the grid side defects proposed virtual flux vector directional rotating coordinate system , to improve these shortcomings in the traditional direct power control strategy , and reduce the number of sensors , the system cost . Inverter part , the article uses the motor rotor field oriented vector control strategies . Finally , the design of the hardware , software , DSP-based dual closed-loop control of the PWM rectifier system achieve decoupling rectifier active power, reactive power , and complete system simulation , the simulation results show that the dual closed-loop PI parameters of voltage and power to select and entire the feasibility of the system .

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CLC: > Industrial Technology > Electrotechnical > Transformers, converters and reactors > Converter > Rectifier
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