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Research of Digital Controlled 400Hz Three-Phase Four-Wire High Power Factor PWM Converter

Author: YangYongFei
Tutor: ShiJianJiangï¼›HeXiangNing
School: Zhejiang University
Course: Power Electronics and Power Drives
Keywords: 400Hz Three - phase four-wire High Power Factor No static error control Equalizing control
CLC: TM461
Type: Master's thesis
Year: 2011
Downloads: 144
Quote: 0
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Abstract


With the new reactive power compensation device, flexible AC and DC transmission technology, high-power high-voltage inverter, the new UPS as well as solar and wind power and other renewable energy grid rapid development of power generation technology, three-phase high power factor PWM rectifier in engineering practice more and more extensive. In this paper, aviation power system AC / DC static converter, designed a set of digital control aviation 400Hz three-phase four-wire high power factor PWM rectifier, to complete the design of the main circuit parameters, the modeling of the main circuit, dq-0 synchronization current inner loop controller design, the rotating coordinate system output series capacitor voltage control, drive circuit design and protection circuit design, and build a 3kW principle prototype. PWM rectifier, not only to its DC output voltage can be controlled, but also the input current is controlled, so that the input current waveform having a good sinusoidal degrees and the same phase with the input voltage, the input destination in order to achieve high power factor. The traditional PI controller AC signal can not be achieved without static error control, fundamental to 400Hz aviation power grid, the static error impact will be more obvious, the input power factor of the system will be significantly reduced. Synchronous rotating coordinate transformation of the system of three-phase input current PI controller design synchronous rotating coordinate system, the input current no static error control, to achieve the purpose of high power factor input. For three-phase four-wire system, the DC output of the series capacitor structure appears when the modulation signal the DC interference or the DC output of asymmetric load may cause output the series capacitor uneven pressure, affect the normal working of the circuit. On the basis of the system modeling equalizing the outer ring through the output series capacitor in series with the system neutral current inner loop the bicyclic control system output series capacitor voltage control, allowing the system to adapt to the half-bridge inverter the requirements of the various loads. Control, the TI TMS320F2812 digital signal processor as the core of the control system, the control algorithm and the PWM control signal is generated by it. Analog sampling and protected by hardware circuit. Finally, on the basis of the theoretical analysis and design of structures 3kW principle prototype principle prototype was loaded with steady-state experimental load switching experiment and asymmetric load experiments Experimental results show that the system design and achieved good effect.

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