基于输入输出线性化的Boost PFC控制研究

发布时间：2018-05-13 19:15

本文选题：输入输出线性化 + 非线性控制　；参考：《广西大学》2017年硕士论文

【摘要】：随着电力电子功率变换技术的快速发展,越来越多的电力电子装置广泛应用于生活家用电器、微电网、轨道交通牵引变流器、航空航天电源系统与航母电磁弹射等军工领域。其中有很大一部分电力电子装置都通过整流器与电力网接口,由二极管组成的整流器为一种非线性的装置。电网的电能通过整流器后其电流会严重畸变对电网造成谐波污染,因此如何抑制电力电子装置产生较大的谐波越来越成为各国学者研究的热点。目前最为有效的方法为有源功率因数校正技术,研究主要集中在校正变换器的拓扑结构与校正控制策略两个方面。本文的校正拓扑采用传统的Boost变换器,研究重点在于其控制算法方面。基于双闭环PI的传统功率因数校正控制策由于是一种针对目标的反馈控制而忽略了变换器模型中的一些因素,因此其在稳态时控制效果还是不错,但是在负载突变或者是有扰动时其动态响应速度较慢,而且起机的电流尖峰很大。基于上述控制策略的不足,本文采用了一种基于输入输出线性化的非线性控制算法,其不是通过在平衡点附近进行泰勒级数展开近似线性化再用经典控制理论设计控制器,而是将原非线性控制系统模型通过适当的非线性坐标变换与状态反馈转换至新的坐标空间中的线性系统,再通过经典控制理论设计控制器,最后通过新坐标空间与原坐标空间的关系推导出原坐标空间的控制律表达式,这种方法没有丢失原非线性系统的任何信息,因此成为各国学者研究的焦点。本文将输入输出线性化方法应用在了功率因数校正Boost变换器上,分别设计推导出了恒功率输出的PFC控制器与恒压输出的PFC控制器,并且经过推导,该方法也可以应用在双管正激变换器上。本文采用专业电力电子仿真软件PSIM对上述推导的控制算法进行仿真验证,通过分析仿真波形可以看出基于输入输出线性化方法的功率因数校正控制策略具有快速的动态响应速度且起机尖峰电流小的特点。本文通过第五、六两章硬件与软件设计的介绍,研制了一台300W的两级式DC/DC变换器,前级为功率因数校正Boost源变换器,后级为双管正激负载变换器。通过在实验平台上的调试与测试,获得了与仿真波形相对应的实验波形,进一步验证了本文所研究的基于输入输出线性化方法控制策略具有较快的动态响应能力,抗扰动能力强的特点。
[Abstract]:With the rapid development of power electronic power conversion technology, more and more power electronic devices are widely used in the military fields such as household appliances, microgrid, rail transit traction converter, aerospace power system and aircraft carrier electromagnetic ejection. A large part of the power electronic devices are connected to the power grid through rectifier. The rectifier composed of diodes is a nonlinear device. After the electric energy of the power grid passes through the rectifier, its current distortion will cause harmonic pollution to the power grid. Therefore, how to restrain the power electronic devices from producing larger harmonics has become a hot research topic of scholars all over the world. At present, the most effective method is active Power Factor Correction (APFC) technology, which is mainly focused on the topology of the rectified converter and the correction control strategy. Traditional Boost converter is used to correct the topology in this paper. The research focus is on its control algorithm. Because the traditional PFC control strategy based on double closed loop Pi is a kind of feedback control for the target, it ignores some factors in the converter model, so it has a good control effect in steady state. However, the dynamic response speed is slow and the current spike is very large when the load is abrupt or disturbed. In this paper, a nonlinear control algorithm based on input and output linearization is proposed, which is not based on the Taylor series expansion near the equilibrium point and then uses classical control theory to design the controller. Instead, the original nonlinear control system model is transformed into the linear system in the new coordinate space by proper nonlinear coordinate transformation and state feedback, and the controller is designed by classical control theory. Finally, through the relation between the new coordinate space and the original coordinate space, the expression of the control law of the original coordinate space is derived. This method has not lost any information of the original nonlinear system, so it has become the focus of the scholars in the world. In this paper, the input and output linearization method is applied to the power factor correction (Boost) converter. The constant power output PFC controller and the constant voltage output PFC controller are designed and deduced, respectively. This method can also be applied to two-transistor forward converters. In this paper, the power electronic simulation software PSIM is used to verify the proposed control algorithm. By analyzing the simulation waveform, it can be seen that the power factor correction control strategy based on input and output linearization has the characteristics of fast dynamic response speed and small peak current. Through the introduction of hardware and software design in the fifth and sixth chapters, a 300W two-stage DC/DC converter with power factor correction (PFC) Boost source converter and two-transistor forward load converter is developed in this paper. Through debugging and testing on the experimental platform, the corresponding experimental waveform is obtained, which further verifies the fast dynamic response ability of the control strategy based on the input and output linearization method studied in this paper. Strong ability to resist disturbance.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM46

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