【作者】 魏坤；

【导师】 路正午； 孙孝峰；

【作者基本信息】 燕山大学 ， 控制理论与控制工程， 2003， 硕士

【摘要】 本论文得到了国家自然科学基金重点项目“全控型GTO三相整流-逆变双向变流器研究”(项目号59577007)和河北省自然科学基金项目“基于波形评估的高功率因数变流器的特性研究”(项目号500206)的资助。本文的研究对象三相电压型可逆变流器系统是一个多输入多输出的非线性系统。在三相变流器的两种典型拓扑中，由于三相电压型可逆变流器拓扑具有比电流型变流器拓扑更好的控制性能尤其在功率回馈或完全正弦的输入电流波形方面远远优越于电流型变流器，而逐渐成为研究的重点。为了解决电力电子装置的谐波和无功功率污染问题，近些年来国内外学者提出了很多控制方案。大大促进了三相变流器的发展和研究。然而大多控制研究是基于变流器理想情况下的，对变流器在非理想情况下的研究工作和系统参数鲁棒性的研究，则探索甚少。本论文将最优控制理论应用到三相变流器系统中，提出了基于状态反馈的比例积分(PI)与线性二次型积分(LQI)相结合的最优控制器，该控制器可在保证系统高功率因数、稳定性的前提下，对负载扰动及系统参数的变化具有一定的鲁棒性，使系统在非理想情况下也能实现恒定的直流输出和单位功率因数。论文中首先回顾了三相变流器控制方式的发展及变化趋势，针对本文的研究对象分析了其工作原理和内部参数间的关系，给出了系统在不同坐标系下的数学模型，为系统的理论分析和实验奠定了基础。在开关调制方式中，本文提出了一种新型的开关策略，使系统能够在最小开关损耗下工作。在理论分析的基础上，运用MATLAB仿真软件分别对控制方式和开关调制方式进行仿真，仿真研究表明与理论分析基本一致。利用数字信号处理器TMS320F240实现了系统的最优控制，设计并调试了系统的主电路和控制电路，对提出的开关调制方式和控制方式进行了DSP的软件编程和调试。最后完成了系统的开环和闭环实验，取得了和仿真一致的结果，从而验证了控制方案的可行性和优越性。更多还原

【Abstract】 The paper is supported by NSF (The National Science Foundation)(Item Number:59577007) and NSF of Hebei province (Item Number:500206).Three-phase voltage source converter is a nonlinear system with multi-input and multi-output. System is widely investigated internationally because it has better capability than current source converter, especially in bi-directional power transfer and sinusoidal current. To solve problem of harmonics and reactive power compensation, researchers have proposed many control strategies in recent years. It accelerated the development of three-phase converter. Most of them are limited on ideally conditions; the study of converters based on non-ideally conditions is so little.Optimal control theory and optimal controller based state-feedback PI and LQI are applied three-phase converter .It not only can guarantee high power factor and stability, but also robust with parameters change of system. At the same time, it can provide constant dc bus voltage and unity power factor under different loads and some non-ideally conditions.At the beginning the controllable techniques of the converter in the world are reviewed. Its operational principle and internal parameter relation are analyzed. The model of system in different coordinates is presented. It’s the base of the theoretic analysis. Then a new switch modulation strategy is discussed. It can make system work in minimum switch loss. The simulation of system control and switch strategy validated consistency with theory analysis using MATLAB. The optimal control is implemented with TMS320F240 The paper introduced the design of hardware and control circuits and completed program of DSP and hardware circuit debugging. At last, experiment of open loop and closed loop system are completed, which is in accord with the simulation result. It verified feasibility and advantage of the control scheme.更多还原