储能站PWM可逆变流器的直接功率控制研究

发布时间：2018-06-22 08:38

本文选题：PWM变流器 + 直接功率控制　；参考：《河南科技大学》2014年硕士论文

【摘要】：随着社会的不断进步，人们对能源的需求越来越高，而化石能源又在不断地减少，为了合理有效地利用能源，储能技术成为现今研究的热点。由于电能生产使用方便而且便于输送，因此目前主要研究电能的存储。储能系统不仅能够对电网负荷进行削峰填谷，而且可以促进太阳能风能等其它可再生能源大规模接入电网，使得能源更加方便高效地被人们使用。储能系统中PWM变流器是其核心部分，其性能的好坏直接决定着系统能否高效稳定运行。本文主要针对20KW小型储能站中的PWM可逆变流器进行研究和分析。介绍了目前储能站的研究现状以及PWM可逆变流器的研究现状和发展方向，阐述了研究PWM变流器具有深远的社会效益。分析PWM变流器四象限运行的工作原理以及变流器常见的拓扑结构和控制策略。以三相电压型PWM变流器为研究对象，建立其在三相静止坐标系、两相静止坐标系和两相旋转坐标系下的数学模型，在数学模型的基础上对PWM变流器进行整流、逆变的研究。在引入瞬时功率概念的基础上，本文主要研究和分析PWM变流器的直接功率控制策略。整流工作时，分析研究直接功率控制策略的原理及系统结构，传统的直接功率控制系统是以开关表为核心，采用电压外环，功率内环的结构控制功率开关管整流，具有结构简单鲁棒性好的优点，但是由于采用滞环比较器和开关表，使得开关频率不固定；针对传统功率控制的不足，本文研究设计了一种预测直接功率控制策略，并结合SVPWM调制技术使系统不仅具有传统直接功率控制的优点，而且实现了开关频率固定。在并网逆变时，由于向电网输送功率因而功率控制更加具有优势，根据瞬时功率理论推导出直接功率控制的数学模型，并在此基础上设计功率控制器，对其参数的选择做出详细推导与计算；设计一种功率解耦的控制方法，，结合SVPWM调制使得直接功率控制具有单位功率因数、网侧电流正弦度更好、谐波更低的优点。在Matlab仿真软件中分别对文中所设计的整流和逆变控制策略进行仿真实验并分析其结果。而后，对20KW小型储能站PWM变流器的控制系统进行硬件和软件的设计，验证控制方法的可行性。
[Abstract]:With the development of society, the demand for energy is higher and higher, and fossil energy is decreasing. In order to use energy reasonably and effectively, energy storage technology has become a hot topic. The storage of electric energy is mainly studied because of the convenience of power production and transmission. The energy storage system can not only reduce the peak load and fill the valley, but also promote the large-scale access of other renewable energy sources, such as solar and wind energy, making energy more convenient and efficient to be used by people. PWM converter is the core part of energy storage system. Its performance directly determines whether the system can operate efficiently and stably. In this paper, the PWM reversible converter in 20 KW small storage station is studied and analyzed. This paper introduces the current research situation of the energy storage station and the research status and development direction of the PWM reversible converter, and expounds the profound social benefits of the research on the PWM converter. The principle of four quadrant operation of PWM converter and the common topology and control strategy of PWM converter are analyzed. Taking the three-phase voltage-source PWM converter as the research object, the mathematical models of the PWM converter in the three-phase stationary coordinate system, the two-phase stationary coordinate system and the two-phase rotating coordinate system are established. On the basis of the mathematical model, the rectifier and inverter of the PWM converter are studied. Based on the concept of instantaneous power, the direct power control strategy of PWM converter is studied and analyzed in this paper. The principle and the system structure of the direct power control strategy are analyzed and studied. The traditional direct power control system is based on the switch table and adopts the structure of voltage outer loop and power inner loop to control the rectifying of the power switch tube. It has the advantage of simple structure and good robustness, but because of the hysteresis comparator and switch table, the switching frequency is not fixed. In view of the shortcomings of traditional power control, a predictive direct power control strategy is designed in this paper. Combined with SVPWM modulation technology, the system not only has the advantages of traditional direct power control, but also realizes the fixed switching frequency. In the grid-connected inverter, the power control has more advantages because of the transmission of power to the grid. According to the instantaneous power theory, the mathematical model of direct power control is derived, and the power controller is designed on this basis. The selection of parameters is deduced and calculated in detail, and a power decoupling control method is designed. Combined with SVPWM modulation, direct power control has the advantages of unit power factor, better sinusoidal current and lower harmonics. In the Matlab simulation software, the simulation experiments and the results of the rectifier and inverter control strategies designed in this paper are carried out respectively. Then, the control system of PWM converter in 20KW small storage station is designed in hardware and software to verify the feasibility of the control method.
【学位授予单位】：河南科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46

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