【作者】 谭超；

【导师】 李守智；

【作者基本信息】 西安理工大学 ， 电力电子与电力传动， 2007， 硕士

【摘要】 随着大功率负载需求和分布式电源系统的发展，电源模块并联控制技术研究的重要性日益增加，而如何实现并联模块间输出电流的平均分配是实现并联的核心技术。现有的均流控制技术大多都是在并联变换器模块简化、近似线性化的小信号数学模型下进行的，因而很难在工程上找到同时满足优化稳定性和动态特性要求的解决方案，针对这个问题，本文分别将积分滑模变结构控制和单周期控制这两种非线性控制技术应用到并联电源模块的均流控制当中，用以改善并联电源系统的稳态和动态均流控制性能。而从目前国内外的参考文献来看，关于这方面的研究报道非常的少。首先，本文在分析国内外关于滑模均流控制技术的基础上，将积分滑模变结构控制应用到并联电源模块的均流控制当中，并利用Matlab／Simulink平台搭建了仿真模型，将其与文献所给出的滑模均流控制策略进行了详细的比较分析。仿真实验结果表明这种积分滑模变结构均流控制策略无论是在并联系统参数存在较大差异，还是在并联系统存在大信号扰动的情况下，均可获得优良的稳压和动静态均流控制性能，这些结论也充分证明了该均流控制策略的合理性和优越性。其次，本文在分析单周期控制技术原理的基础上，提出了一种单周期均流控制策略，并利用PSPICE软件对其进行了仿真实验验证，仿真结果表明这种非线性均流控制策略具有良好的动静态均流控制特性。同时，在此基础上，本文搭建了由两个具有耦合电感的SEPIC变换器并联所构成的实验平台，并通过该实验平台对所提出的单周期均流控制策略进行了实验研究，实验结果再次证明了该均流控制策略的正确性和可行性。更多还原

【Abstract】 With the increasing demand of large power load and the development of distributed power supply system, the importance of research on paralleled power supply modules is increasing, while how to achieve the equilibration of output currents is the key technology of making the modules work in parallel. At present most current-sharing control are achieved in condition that the approximate linearization small-signal models, so it is difficult to find the scheme which can optimize the stability and dynamics at the same time. Aiming at this problem, integral sliding-mode control and one-cycle control are applied to the paralleled DC/DC converters in this thesis in order to enhance the steady and dynamic current-sharing control performances of paralleled power supply systems. From the references which have been mentioned, the researches on this aspect are seldom discussed.On the one hand, integral sliding-mode control is applied to paralleled power supply modules in this thesis. Based on the simulation model established by MATLAB/SIMULINK platform, the detailed comparisons are taken between the proposed approach and the reference’s method. The simulation results show that the proposed integral sliding-mode current-sharing control scheme can achieve good steady-state voltage and steady and dynamic performances whatever large parameter differences or large signal disturbances. These results also well prove that the validation and superiority of the proposed method in this thesis.On the other hand, by analyzing the one-cycle control theory, a current-sharing control scheme using one cycle control is proposed in this thesis, and the simulation of it is done with PSPICE software. The results show that this nonlinear current-sharing control scheme is characterized by good steady and dynamic performances. On the basis of researches above, a prototype which consists of two paralleled DC/DC SEPIC converters with coupled inductors is designed. Some experiments have been made. The experimental results show that the approach proposed is accurate and feasible again.更多还原