【作者】 贺帆；

【导师】 张宇；

【作者基本信息】 华中科技大学 ， 电气工程， 2016， 硕士

【摘要】 逆变电源可以将直流电转变成电压、频率、相位均可控的交流电,是现代社会不可缺少的一部分。随着节能环保的意识不断提高,对逆变电源工作效率也有了更高的需求。本文针对一种工作于电感电流混合导通模式的逆变器进行了深入的研究,设计效果理想的控制算法,使电路尽可能多的稳定工作于电感电流断续模式,实现开关管零点流开通,优化电路整体效率。本文对电感电流断续模式逆变器的工作状态进行仔细的分析,在数学建模的过程中对比了此逆变器与电感电流连续运行的逆变器的不同。在控制策略方面,提出了以电荷量传递为基础的PID控制模型,通过仿真以及实验结果证明了此控制模型对电感电流断续模式逆变器的适用性,同时与其他控制策略进行对比,分析了各个控制策略的优劣。由于电感电流断续模式逆变器在正常工作时,电感电流的峰值比电感电流连续运行的逆变器高三倍以上,因此母线寄生电感对开关管开关过程的影响会尤为突出。本文对母线寄生电感的计算公式进行详细的推导,并分析了寄生电感对开关损耗的影响,提出了降低寄生电感应采取的措施。为了使电路正常工作于电感电流断续模式,对LC滤波参数的设计有更高的要求。本文从最大瞬时功率的角度出发,给出了LC滤波参数的设计公式,并给出了在设计过程中需要考虑的因素。针对两电平半桥逆变电路,对开关管的选型提供了简单的参考。最终通过实际电路,验证了理论控制方案的正确性。更多还原

【Abstract】 The inverter can convert DC voltage into voltage, frequency and phase-controlled AC voltage, which is an integral part of modern society. With the increasing awareness of energy saving and environmental protection, the efficiency of the inverter also has higher requirements. An inverter operates in discontinuous inductor current mode is studied in this article, and the control strategy is designed to stabilize the circuit. The discontinuous inductor current mode can realize zero current switching, optimize the overall efficiency of the circuit.The working state of inverter in discontinuous inductor current mode is analyzed, and the mathematical model is made and compared with the inverter in continuous inductor current mode. In terms of controlling strategies, a PID controller based on quantity of electric charge is proposed. The simulation and experiment result shows that this control strategy has great stability. Up to three control strategies are proposed and compared with each other.When the inverter works in discontinuous inductor current mode, the peak current of the inductor is three times higher than the normal inverter. The influence of parasitic inductance on the switching process will be particularly great because of the higher peak current. The calculation formula of parasitic inductance in bus line is deduced in detail, and the influence of parasitic inductance on the switching loss is analyzed. Several measures to reduce parasitic inductance are proposed.In order to make the circuit work in discontinuous inductor current mode firmly, more demand is needed when designing the LC filter parameter. The factors should be considered in the design process are given, and the formulas of designing the LC filter parameter are deduced, in the perspective of maximum instantaneous power. The type of switching devices is selected for the half bridge inverter. The experiments have been made to verify the correctness of the theory.更多还原