【作者】 柳辉；

【导师】 张宇；

【作者基本信息】 华中科技大学 ， 电气工程， 2014， 硕士

【摘要】 逆变器作为交流电源的重要组成部分，广泛应用于UPS、电力机车等工业领域。随着现代通信技术和制造技术的迅速发展，人们对逆变电源供电设备的容量和可靠性需求不断增加。而逆变器的并联是实现大功率、高可靠性供电的重要手段。本文对逆变器的瞬时波形控制技术和并联运行特性进行研究，在此基础上成功实现了两台40kVA逆变器的并联稳定运行。文章首先介绍了各种逆变器控制技术和并联策略，分析了各种波形控制和并联技术的优缺点。然后选取最为广泛的PID控制和双环控制技术进行研究，运用极点配置的方法设计了控制器参数。通过对闭环系统的分析，阐述了闭环控制提高系统动态性能和抑制负载扰动性能的机理。得到逆变器并联系统基于输出阻抗的模型，在此基础上对并联系统的环流和功率特性进行分析，研究了输出阻抗特性对输出功率的影响。得到采用双环控制的逆变器并联系统中环流的s域表达式，分析了不同控制器参数和电路参数对基波环流和谐波环流的影响。最后在三相组合式逆变器并联系统上进行试验研究。结果表明，采用双环控制使逆变器具有良好的动态性能和抗负载扰动能力。采用有功功率调压的分散逻辑控制策略，使系统的环流得到抑制，并联系统稳定运行。更多还原

【Abstract】 As the most important part of AC power supply, inverter is widely used in industrialareas such as UPS and electric locomotive. With the development of moderncommunications technology and advanced manufacturing technology, the capacity andreliability needs of inverter power supply equipment is increasing. The parallel inverter isan important means to achieve high power and high reliability power supply. In this paper,the transient waveform control technology and operational characteristics of parallelinverter was studied. On this basis, stable operation of two parallel40kVA inverters wasachieved.Firstly, the advantages and disadvantages of various inverter waveform controltechniques and parallel technology were introduced and analyzed. Then the most widelyused PID control tectnology and double-loop control technology were researched. Byusing pole placement method, the parameters of the controller were designed. The analysisof the closed-loop system showed that closed-loop control can improve system dynamicperformance and resist load disturbance.On the basis of getting the parallel system model based on output impedence, thecharacteristic of circulating current and circulating power were analyzed. Then theinfluence of output impedence on output power was studied. On the basis of getting thecirculating current transfer function in s domain of the parallel-inverter system, which usesdouble-loop control technology, the influence of controller parameters and main circuitparameters on the fundmental circulating current and the harmonic circulating currentwere analyzed.Finally, experimental studies were carried out on a three-phase combined inverterparallel system. Experimental results showed that inverters using double-loop control havegood dynamic performance and the ability to inhibit load disturbance. Distributed logiccontrol stratege based on active power error of inverters was applied. The circulatingcurrent of parallel system was inhibited, so parallel system can operate stablely.更多还原