单相高频链逆变器控制及并网技术研究

发布时间：2018-01-12 03:10

本文关键词：单相高频链逆变器控制及并网技术研究　出处：《燕山大学》2015年硕士论文　论文类型：学位论文

【摘要】：高频链逆变器由变压器原边高频逆变器、高频变压器、变压器副边周波变换器以及输出滤波器组成,能够克服传统工频逆变器体积大、噪声大、成本高等缺点,具有电路拓扑成熟、隔离型功率变换及能量双向流动等优点,被广泛研究。然而如何解决周波变换器的安全换流问题一直是该类逆变器的技术难点。针对此问题,本文提出一种解结耦单极性移相调制策略,能够实现周波变换器中所有功率管的零电压开关(ZVS)以及变压器漏感和滤波电感电流的自然换流,达到安全换流的目的。首先,本文对高频链逆变器的拓扑类型进行了概述,介绍了高频链逆变器的研究现状,分析了几种拓扑存在的优缺点。针对周波变换型单相高频链逆变器拓扑展开分析,并对目前存在的几种换流方法进行了分析和总结。其次,本文总结了解结耦调制方法和单极性移相调制方法的优点,进一步提出解结耦单极性移相调制策略,并且详细分析了该策略实现软换流的工作过程。同时,又进一步研究了周波变换器中开关管两端电压尖峰和电压震荡的产生原因,通过理论证明了在变压器原边引入钳位二极管及谐振电感抑制电压震荡的可行性,并重点分析了加箝位二极管及谐振电感的单相高频链逆变器的工作过程。然后,本文对单相高频链逆变器的闭环控制和并网控制进行了研究,结合解结耦单极性移相调制方法建立了单相高频链逆变器的数学模型。在此基础上,研究了单相高频链逆变器的双闭环控制及并网控制技术,介绍了基于二阶广义积分器的电网电压同步技术及其设计方法,并讨论了PR调节器和PI调节器的参数优化方法。最后,在理论和仿真研究的基础上,本文对整个系统的软硬件进行了详细的设计,搭建了1k VA的实验平台,采用DSP与CPLD联合的数字控制,通过实验验证了上述理论的正确性和可行性。
[Abstract]:The high frequency chain inverter is composed of transformer primary high frequency inverter, high frequency transformer, transformer auxiliary side cycle converter and output filter. It can overcome the disadvantages of traditional power frequency inverter such as large volume, large noise, high cost and so on. It has the advantages of mature circuit topology, isolated power conversion and bidirectional energy flow. However, how to solve the safe commutation problem of Zhou Bo converter has been the technical difficulty of this kind of inverter. In view of this problem, this paper proposes a decoupled unipolar phase shift modulation strategy. The ZVSs of all power transistors in Zhou Bo converter and the natural commutation of leakage inductance and filter inductance current of transformer can be realized to achieve the purpose of safe commutation. In this paper, the topology types of high frequency chain inverter are summarized, and the research status of high frequency chain inverter is introduced. The advantages and disadvantages of several topologies are analyzed. The topology of Zhou Bo transform single-phase high-frequency chain inverter is analyzed, and several commutation methods are analyzed and summarized. Secondly. In this paper, we summarize the advantages of decoupling modulation and unipolar phase shift modulation, and further propose a decoupling single-polarity phase-shift modulation strategy, and analyze the working process of soft commutation in detail. The causes of voltage spike and voltage oscillation at both ends of switch in Zhou Bo converter are further studied. The feasibility of introducing clamped diode and resonant inductor to the original edge of transformer to suppress voltage oscillation is proved by theory. The working process of single-phase high-frequency chain inverter with clamped diode and resonant inductor is analyzed. Then, the closed-loop control and grid-connected control of single-phase high-frequency chain inverter are studied in this paper. The mathematical model of single-phase high-frequency chain inverter is established by using decoupling unipolar phase-shift modulation method. Based on this, the double-closed-loop control and grid-connected control technology of single-phase high-frequency link inverter are studied. This paper introduces the voltage synchronization technology based on the second order generalized integrator and its design method, and discusses the parameter optimization methods of PR regulator and Pi regulator. Finally, on the basis of theoretical and simulation research. In this paper, the hardware and software of the whole system are designed in detail. A 1kVA experimental platform is built, and the digital control of DSP and CPLD is adopted. The correctness and feasibility of the above theory are verified by experiments.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM464

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