单相车载充放电机前级可逆整流器研究

发布时间：2018-01-10 16:08

本文关键词：单相车载充放电机前级可逆整流器研究　出处：《重庆大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着能源危机的不断加重，电动汽车作为一种节能减排的有效手段正在不断地被推广应用，电动汽车动力电池作为一个移动的分布式储能单元可以在电网高峰负荷时段向电网传输电能，而在电网非高峰负荷时段电网又向其充电，这就是目前日益受到关注的V2G技术。在典型的V2G技术中，电动汽车车载充放电机是实现电动汽车和电网能量互动的重要中间接口，其一般为双向AC/DC和双向DC/DC级联的两级结构，其前级变换器对于满足车载充放电机高功率因数、能量双向流动、较低的电流谐波畸变率的要求发挥了重要作用，本文将单相可逆PWM整流器作为其前级双向AC/DC变换器，对其进行相关研究。本文首先在单相可逆PWM整流器主电路拓扑结构的基础上建立了其瞬时等值电路模型并对所采用的双极性调制策略下电路的电流回路进行了分析。根据课题的指标要求设计了主电路参数并对电压电流环均采用PI控制器的单相可逆PWM整流器进行了环路设计和仿真分析。其次，针对车载充放电机低谐波畸变率和高功率密度的要求，提出在前级可逆PWM整流器中采用多重谐振控制器和陷波滤波器相结合的控制策略，相比于传统PI控制器有效地降低了输入电流中的低次谐波含量，同时避免了有源及无源滤波器的使用，，提高了功率密度；由于加入多重谐振控制器的电流内环成为一个高阶系统，控制器参数设计困难，文中采用根轨迹分析法，利用系统的等效参量根轨迹对控制器的参数进行了详细的分析和设计；在理论分析及参数设计的基础上搭建了Matlab/Simulink仿真模型进行仿真研究，仿真结果验证了理论分析及所提控制策略的有效性。最后，根据课题指标要求搭建了3.5kW基于DSP28335的实验样机系统进行实验研究和验证，主要包括硬件系统和软件系统，完成了硬件电路中主功率电路及控制电路的设计选型；完成了软件系统的主体程序设计并对AD采样、锁相程序、SPWM波形产生子程序进行了详细分析设计，提出一种简单实用的软件过零锁相方法提高了锁相精度；在所搭建的实验样机平台的基础上进行了各部分硬件及软件程序的调试，并对前级单相可逆PWM整流器进行了稳态及动态特性实验测试，为下一步工作奠定了基础。
[Abstract]:With the energy crisis worsens, the electric car as an effective means of energy saving and emission reduction are constantly being applied, the electric vehicle power battery as a mobile distributed storage unit can transmit power to the grid in the peak load period, while in power grid and off peak hours to charge it, this is at present, the V2G technology has been paid more and more attention. In a typical V2G technology, electric vehicle charging motor is an important intermediate interface electric vehicles and power grid energy interaction, which is generally two level structure with bidirectional AC/DC and two-way DC/DC, the pre stage converter for high power motor vehicle to meet the filling factor the two-way flow of energy, low current harmonic distortion rate requirements play an important role in the single-phase reversible PWM rectifier as the first stage of bi-directional AC/DC converter, related to the Research.
Based on the topology structure of single-phase reversible PWM rectifier main circuit is established on the equivalent circuit model of the instantaneous and the current loop circuit of the bipolar modulation strategy used was analyzed. The single-phase reversible PWM rectifier according to the requirement of the project design and the index of main circuit parameters on the voltage and current loop using PI controller the analysis of the loop design and simulation.
Secondly, according to the vehicle charge discharge low harmonic distortion and high power density requirements, puts forward the control strategy in the first level PWM reversible rectifier uses multiple resonant controller and notch filter combination, compared to the traditional PI controller can effectively reduce the harmonics in the input current, while avoiding the use of active and the passive filter, and improve the power density; the current loop add multiple resonant controller into a high order system, difficult parameter to design the controller, using the root locus method, the equivalent parameters of system parameters by using the root locus of the controller are analyzed and designed in detail; simulation model is built based on Matlab/Simulink the theoretical analysis and parameter design of the simulation, the simulation results verify the theoretical analysis and the effectiveness of the proposed control strategy.
Finally, according to the project requirements to build 3.5kW were studied and verified by an experimental prototype system based on DSP28335, including hardware system and software system, complete the design and selection of the main power circuit and control circuit in hardware circuit; completed the main body of program design software system based on AD sampling, phase lock procedures, SPWM waveform generation the subroutine of a detailed analysis of the design, puts forward a simple and practical software phase-locked zero method improves the precision of PLL; debugging of each part of the hardware and software program based on experimental prototype platform to build on, and the single-phase reversible PWM rectifier experiment of static and dynamic characteristics test, laid the foundation for the next step.

【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM461

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