3kW稳流源变换器的设计与实现
发布时间：2019-02-17 09:55
【摘要】：本文结合实验室项目提出了 3kW稳流源变换器的设计与实现课题,对3kW稳流源前级VIENNA整流器和后级全桥DC/DC变换器分别进行了设计和优化。VIENNA整流器拓扑是三电平电路,具有开关应力小、输入电流总谐波失真度低、功率因数高、结构简单等优点,引起了国内外学者的广泛研究。全桥DC/DC变换器因其输出功率高而且能够利用自身电路参数实现软开关的特点而在中大功率场合得到广泛应用。首先进行了 VIENNA整流器的设计与优化。在简要介绍其原理的基础上进行了数学建模分析,随后结合3kW系统对VIENNA整流器进行了详细的工程设计,包括直流侧电容设计、LCL滤波器设计和控制系统设计。此外,针对电网电压畸变引起的输入电流畸变,采用了一种结合VIENNA整流器控制环路的指定次谐波消除法,该方法在谐波旋转坐标系下提取指定次谐波分量,继而通过闭环得到谐波电流指令值,随后将其变换到基波坐标系下进行指定次谐波优化。针对LCL滤波器存在的谐振问题,通过引入无源阻尼的方法以抑制谐振尖峰,增加系统稳定性。在全桥DC/DC变换器的设计与优化中,首先简要介绍其拓扑结构和双极性控制的工作原理,随后通过数学建模分析推导出小信号模型。通过引入交错并联技术,降低原边开关管电压应力和副边整流二极管电流应力同时降低了总电感电流纹波,损耗和应力也可均衡地分配到多个电路模块和磁性元件上,有利于电源的散热设计。随后给出了滤波电感设计、储能元件设计、隔直电容设计、变压器设计、换向桥设计以及控制系统设计的方法,并在MATLAB/Simulink仿真平台上进行了验证。针对输出电流过零换向前因依靠输出电容自然放电的特点而产生换向畸变的问题,采用了输出电流过零前功率器件高频短路的方法以实现快速放电,优化输出电流畸变。最后,按照工程设计中的具体参数搭建了 3kW稳流源实验平台并进行了工程设计和优化方法的有效性验证。
[Abstract]:In this paper, the design and implementation of 3kW stabilized current source converter are presented, and the design and optimization of VIENNA rectifier in front stage of 3kW source and full bridge DC/DC converter in rear stage are carried out respectively. The topology of VIENNA rectifier is a three-level circuit. With the advantages of low switching stress, low distortion of total harmonic of input current, high power factor and simple structure, it has been widely studied by scholars at home and abroad. Full-bridge DC/DC converters are widely used in medium and high power applications because of their high output power and the ability to use their own circuit parameters to realize soft switching. First, the design and optimization of VIENNA rectifier are carried out. Based on the brief introduction of its principle, the mathematical modeling and analysis are carried out, and then the detailed engineering design of the VIENNA rectifier is carried out in combination with the 3kW system, including the design of the DC side capacitance, the design of the LCL filter and the design of the control system. In addition, aiming at the input current distortion caused by the voltage distortion of the power network, a specified subharmonic elimination method combined with the VIENNA rectifier control loop is adopted. The method extracts the specified sub-harmonic component in the harmonic rotation coordinate system. Then the order value of harmonic current is obtained by closed loop and then transformed to the fundamental coordinate system to optimize the specified subharmonics. Aiming at the resonance problem of LCL filter, a passive damping method is introduced to suppress the resonance spike and increase the stability of the system. In the design and optimization of full-bridge DC/DC converter, the topology and the working principle of bipolar control are briefly introduced, and then the small-signal model is derived by mathematical modeling. By introducing the staggered parallel technique, the voltage stress of the primary side switch tube and the current stress of the auxiliary side rectifier diode are reduced, while the total inductance current ripple is reduced, and the loss and stress can be evenly distributed to many circuit modules and magnetic elements. It is beneficial to the heat dissipation design of power supply. Then, the design of filter inductor, energy storage element, direct capacitance design, transformer design, commutation bridge design and control system design are given, and verified on MATLAB/Simulink simulation platform. In order to solve the problem of commutation distortion caused by output capacitance natural discharge, the high frequency short circuit method of output current zero crossing power device is adopted to realize fast discharge and optimize output current distortion. Finally, according to the specific parameters of the engineering design, the experimental platform of 3kW steady current source is built and the validity of the engineering design and optimization method is verified.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM46
[Abstract]:In this paper, the design and implementation of 3kW stabilized current source converter are presented, and the design and optimization of VIENNA rectifier in front stage of 3kW source and full bridge DC/DC converter in rear stage are carried out respectively. The topology of VIENNA rectifier is a three-level circuit. With the advantages of low switching stress, low distortion of total harmonic of input current, high power factor and simple structure, it has been widely studied by scholars at home and abroad. Full-bridge DC/DC converters are widely used in medium and high power applications because of their high output power and the ability to use their own circuit parameters to realize soft switching. First, the design and optimization of VIENNA rectifier are carried out. Based on the brief introduction of its principle, the mathematical modeling and analysis are carried out, and then the detailed engineering design of the VIENNA rectifier is carried out in combination with the 3kW system, including the design of the DC side capacitance, the design of the LCL filter and the design of the control system. In addition, aiming at the input current distortion caused by the voltage distortion of the power network, a specified subharmonic elimination method combined with the VIENNA rectifier control loop is adopted. The method extracts the specified sub-harmonic component in the harmonic rotation coordinate system. Then the order value of harmonic current is obtained by closed loop and then transformed to the fundamental coordinate system to optimize the specified subharmonics. Aiming at the resonance problem of LCL filter, a passive damping method is introduced to suppress the resonance spike and increase the stability of the system. In the design and optimization of full-bridge DC/DC converter, the topology and the working principle of bipolar control are briefly introduced, and then the small-signal model is derived by mathematical modeling. By introducing the staggered parallel technique, the voltage stress of the primary side switch tube and the current stress of the auxiliary side rectifier diode are reduced, while the total inductance current ripple is reduced, and the loss and stress can be evenly distributed to many circuit modules and magnetic elements. It is beneficial to the heat dissipation design of power supply. Then, the design of filter inductor, energy storage element, direct capacitance design, transformer design, commutation bridge design and control system design are given, and verified on MATLAB/Simulink simulation platform. In order to solve the problem of commutation distortion caused by output capacitance natural discharge, the high frequency short circuit method of output current zero crossing power device is adopted to realize fast discharge and optimize output current distortion. Finally, according to the specific parameters of the engineering design, the experimental platform of 3kW steady current source is built and the validity of the engineering design and optimization method is verified.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM46
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