能馈型直流电子负载的控制算法设计

发布时间：2018-06-21 20:44

本文选题：电子负载 + 负载模拟器　；参考：《电子科技大学》2014年硕士论文

【摘要】：随着电源技术的飞速发展,电源类产品的种类层出不穷,电源类产品的需求不断提高,它们的故障有时会给人们的生产生活带来不便甚至巨大的损失。因此,一般出厂前都要对这些电源类产品根据其性能需求做相应的^/载测试。传统的带载测试采用静态阻抗方法,这种方法存在诸多缺点,如负载形式比较单一,灵活性较差,能量大都以热能形式耗散等,已经越来越不能满足电源的性能测试需求,随之,电子负载作为一种新型的负载形式已成为一种趋势。本文研究的能量回馈型直流电子负载针对的被测直流电源输出电压25V~28.5V,额定功率5kW,额定电流175A,电流纹波在5%以内。被测直流电源输出电压低,电流大,为了实现能量回馈功能,需要将最高28.5V的低电压升至650V,要求电子负载电路具有高升压比功能,因此,电子负载的电路拓扑选为三级结构。本文将对该具有三级电路拓扑结构的能量回馈型直流电子负载的控制算法进行设计,包括负载模拟电流跟踪控制策略、逆变并网控制策略,使系统能够灵活的模拟各种形式的负载并将能量回馈到电网。1、介绍所要研究能量回馈型直流电子负载的三级拓扑结构各部分电路在系统中的作用;根据系统功能,分析能馈型直流电子负载的工作原理。2、在电子负载负载模拟原理的基础上设计直流电子负载的工作模式。输入侧电流控制采用PI控制,使电子负载输入侧电流准确快速跟踪指令电流变化,利用三阶最佳设计方法对PI参数进行设计,实现直流电子负载灵活模拟各种负载形式的功能。3、从能量回馈型电子负载后级能量回馈的功能出发,分析三相电压型PWM逆变器(VSI)变换器的控制目标,选择电流型控制方式,确定变换器输出电流作为被控制量。在此基础上设计一套完整的三相VSI变换器并网控制策略,并对控制参数进行设计,实现入网电流的单位功率因数并网。4、用MATLAB/simulink对所设计的控制算法进行仿真验证,并在实验平台上进行实验验证,记录实验数据与实验波形,所得波形和数据表明所设计的控制算法能够达到预期的目标。
[Abstract]:With the rapid development of power technology, the kinds of power products emerge one after another, the demand of power products is increasing constantly, their faults sometimes bring inconvenience to people's production and life, even huge losses. Therefore, these power supply products should be tested according to their performance requirements before they leave the factory. The traditional static impedance method is used in load testing. This method has many disadvantages, such as single load form, poor flexibility, energy dissipation in the form of thermal energy, etc., which has become more and more unable to meet the performance test requirements of power supply. As a new type of load, electronic load has become a trend. The output voltage of the measured DC power supply is 25V / 28.5 V, the rated power is 5kW, the rated current is 175A, and the current ripple is less than 5%. The measured DC power supply has low output voltage and large current. In order to realize the energy feedback function, it is necessary to raise the maximum low voltage of 28.5V to 650V, which requires the electronic load circuit to have the function of high boost ratio. Therefore, the circuit topology of the electronic load is chosen as the tertiary structure. In this paper, the control algorithm of the energy feedback DC electronic load with three-level circuit topology is designed, including the load analog current tracking control strategy, the inverter grid-connected control strategy. So that the system can simulate various forms of load flexibly and feedback energy to the power grid. The paper introduces the function of the three-level topology circuit of the energy feedback DC electronic load in the system; according to the function of the system, The working principle of the energy fed DC electronic load is analyzed and the working mode of the DC electronic load is designed on the basis of the simulation principle of the electronic load. Pi control is used to control the input current of the input side, which makes the input current of the electronic load track the change of the instruction current accurately and quickly. The Pi parameters are designed by using the third-order optimal design method. This paper realizes the function of DC electronic load to simulate all kinds of load forms flexibly. Starting from the function of energy feedback electronic load, this paper analyzes the control target of three-phase voltage source PWM inverter and chooses the current mode control mode. The output current of the converter is determined as the controlled quantity. On the basis of this, a complete control strategy of three-phase VSI converter is designed, and the control parameters are designed to realize the grid-connected unit power factor of the input current. The designed control algorithm is simulated and verified by MATLAB / Simulink. The experimental data and waveforms are recorded on the experimental platform, and the results show that the proposed control algorithm can achieve the desired goal.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN86

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