三相电压型PWM整流器非线性控制的研究

发布时间：2018-05-27 14:11

本文选题：PWM整流器 + 非线性控制　；参考：《中国矿业大学》2014年硕士论文

【摘要】：电压型PWM整流器能够真正实现“绿色电能变换”，随着PWM整流器的应用日益广泛，相关学者相继提出了多种控制效果优良的非线性控制策略，而大多数的非线性控制方法都有各自的优缺点。本文以三相电压型PWM整流器为研究对象，选择两种非线性控制策略分别进行研究分析。无源控制算法简单，易于实现，，具有一定的鲁棒性，在机器人的控制方面应用广泛。本文根据三相电压型PWM整流器在dq坐标系下的EL数学模型，由系统的期望平衡点出发设计出系统的误差能量函数，采用阻尼注入的方法设计系统的无源控制器，使得系统在期望点能够稳定，同时还解决了系统的耦合问题，可以实现了电源的“绿色变换”，并且可以通过对注入阻尼的调节来改善系统的性能。反推控制是用一种递归的方式从控制结果出发反向得出系统的控制律，能够达到系统的全局稳定，控制性能比较优异，特别是在机器人以及飞行器的控制方面具有显著的控制优点。本文根据三相电压型PWM整流器的数学模型，将整个系统看成多个子系统，从直流侧输出电压的期望值出发，构造系统的第一个子系统和Lyapunov函数，为使子系统达到稳定，设计出虚拟控制函数，如此类推，对每一个子系统加以设计，直到得出系统的实际控制。最后通过Matlab的仿真结果对三相电压型PWM整流器的无源控制算法和反推控制算法分别进行了静动态性能的分析，并且通过仿真波形分析了两种控制策略中控制参数对系统性能的影响，设计出更好的参数组合，使系统的各项指标达到最佳，最后分别从控制器的设计过程、控制参数以及系统参数扰动对性能的影响三个方面对两种控制进行了对比分析。
[Abstract]:Voltage source PWM rectifier can truly realize "green power conversion". With the increasing application of PWM rectifier, many nonlinear control strategies with good control effect have been put forward by related scholars. Most nonlinear control methods have their own advantages and disadvantages. In this paper, three phase voltage source PWM rectifier is chosen as the research object, and two nonlinear control strategies are selected to study and analyze respectively. The passive control algorithm is simple, easy to implement, robust and widely used in robot control. In this paper, according to the El mathematical model of three-phase voltage source PWM rectifier in dq coordinate system, the error energy function of the system is designed from the expected equilibrium point of the system, and the passive controller of the system is designed by the method of damping injection. The system is stable at the desired point, and the coupling problem of the system is solved. The "green transformation" of the power supply can be realized, and the performance of the system can be improved by adjusting the injection damping. The backstepping control is a recursive way to get the control law of the system from the control result. It can achieve the global stability of the system, and the control performance is excellent. Especially in the control of robots and aircraft has significant control advantages. According to the mathematical model of three-phase voltage-source PWM rectifier, the whole system is regarded as several subsystems. The first subsystem and Lyapunov function of the system are constructed from the expected value of DC output voltage, in order to make the subsystem stable. The virtual control function is designed, and so on, every subsystem is designed until the actual control of the system is obtained. Finally, the static and dynamic performance of the passive control algorithm and the backstepping control algorithm of the three-phase voltage-source PWM rectifier are analyzed by the simulation results of Matlab. The influence of the control parameters on the performance of the system is analyzed through the simulation waveform, and a better combination of parameters is designed to achieve the best performance of the system. Finally, the design process of the controller is given. The control parameters and the effects of system parameters disturbance on the performance of the two kinds of control are compared and analyzed.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM461

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