基于电压型PWM变换器的交流电子负载研究

发布时间：2018-06-20 04:29

本文选题：交流电子负载 + 电压型PWM　；参考：《南京师范大学》2015年硕士论文

【摘要】：电源装置在工农业生产和人们的日常生活中有着广泛的应用,电源的损坏将直接造成用电设备停止工作,进而影响到生产、生活。正因为电源设备的重要性,国内外的相关行业都相应地制订了各种电源质量标准来考核电源产品的性能质量,电源装置在出厂时都需要进行严格的老化实验和动态、稳态带载测试,以保证出厂电源的优良品质。由于传统电源测试方式存在能耗大、灵活性差等诸多缺点已经很难满足测试要求,为了解决这一问题,本文设计了一种交流电子负载装置,以满足各种测试场合的要求。本文的研究内容主要包括以下几个方面：分析了单相和三相交流电子负载的主电路拓扑结构,对单相和三相电压型PWM变换器的开关工作模式以及数学模型分别进行了分析。分析了负载模拟变换器模拟各种形式负载的原理以及电压型PWM变换器的电流控制原理,介绍了几种常用的直接电流控制方式,并选择滞环电流跟踪控制策略来控制负载模拟变换器的输入电流；分析了负载模拟变换器中主电路参数的设计,包括推算交流侧输入电感值和直流母线电容值的取值范围,研究了主电路中几项影响全控型器件开关频率的因素；最后搭建了基于MATLAB/Simulink平台的负载模拟变换器的仿真模型,通过模拟各种类型的负载,验证了滞环电流跟踪控制在负载模拟变换器中的可行性和准确性。最后,提出了两种并网逆变方案：一是电压型PWM变换器结构的传统桥式并网逆变电路,对该电路采用电压外环、电流内环的双闭环控制策略,其中内环电流采用滞环电流跟踪控制；二是本文提出的新型桥式并网逆变电路,对该电路采用单周期控制方式来控制其输出电压,从而间接控制输出侧交流电流。在MATLAB/Simulink平台上分别建立两种并网逆变方案的仿真模型,并对仿真结果进行了分析和比较。
[Abstract]:Power supply devices are widely used in industrial and agricultural production and people's daily life. The damage of power supply will directly cause the electrical equipment to stop working, and then affect the production and life. It is precisely because of the importance of power supply equipment that relevant industries at home and abroad have correspondingly formulated various power quality standards to assess the performance quality of power supply products, and power supply devices need strict aging experiments and dynamics when they leave the factory. Steady state load test to ensure the excellent quality of power supply. In order to solve this problem, a kind of AC electronic load device is designed to meet the requirements of various test occasions because of the disadvantages of high energy consumption and poor flexibility in the traditional power supply test mode. The main contents of this paper are as follows: the main circuit topology of single-phase and three-phase AC electronic load is analyzed, and the switching mode and mathematical model of single-phase and three-phase voltage-source PWM converters are analyzed respectively. This paper analyzes the principle of simulating various kinds of load in load analog converter and the current control principle of voltage source PWM converter, and introduces several common direct current control methods. The hysteresis current tracking control strategy is selected to control the input current of the load analog converter, and the design of the main circuit parameters in the load analog converter is analyzed, including the range of the input inductance of AC side and the value of DC busbar capacitance. Several factors affecting switching frequency of full-control devices in main circuit are studied. Finally, a simulation model of load analog converter based on MATLAB / Simulink platform is built, and various kinds of loads are simulated. The feasibility and accuracy of hysteresis current tracking control in load analog converter are verified. Finally, two grid-connected inverter schemes are proposed: one is the traditional bridge grid-connected inverter circuit with voltage source PWM converter structure, which adopts double closed loop control strategy of voltage outer loop and current inner loop. The internal loop current is controlled by hysteresis current tracking, and the new bridge grid-connected inverter is proposed in this paper. The output voltage of the circuit is controlled by a single period control mode, which indirectly controls the AC current at the output side. The simulation models of two grid-connected inverter schemes are established on MATLAB / Simulink platform, and the simulation results are analyzed and compared.
【学位授予单位】：南京师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM46

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