基于储能的间歇式电源入网功率波动平抑控制策略研究

发布时间：2018-05-22 18:12

本文选题：光伏发电系统 + 直驱永磁同步风力发电系统　；参考：《电子科技大学》2016年硕士论文

【摘要】：能源危机和环境污染问题已经引起了世界各国的广泛关注,大力发展可再生能源发电系统是解决上述问题的关键技术手段。风能和太阳能发电是可再生能源的重要发展方向,随着风力发电和光伏发电的快速发展,其装机容量快速上升。由于风光发电系统输出功率对天气变化极为敏感,具有随机性和间歇性特点,大规模间歇性能源接入传统电力系统将会对并网点功率和频率造成不利影响。为了解决这一问题,通常在风光发电系统中配置储能装置平抑间歇性能源输出功率波动来改善系统的电能质量。本文针对这一问题,以风光储发电系统为研究对象,重点研究储能装置在风光系统中的应用技术,提出了储能系统改进型功率波动平抑控制策略。建立了光伏发电系统、直驱永磁同步风力发电系统以及蓄电池储能系统的数学模型,给出了光伏电池和风力涡轮机输出特性,分析了光照和温度变化情况下对光伏的电气特性的影响,同时也分析了风速以及桨距角变化对转矩和输出功率的影响。给出了蓄电池的等效电路,对蓄电池充电和放电全过程进行了分析。根据可再生能源发电系统中不同变换器的职能制定了光伏发电系统和风力发电系统中电力电子装置的控制策略,给出了系统的控制结构,并且进行了详细的分析。通过典型I型和II型系统设计了PWM变换器的外环和内环的PI参数,通过仿真软件分别搭建了风力发电系统和光伏发电系统的仿真模型,在风速变化情况下对风力发电系统进行了仿真研究,验证了最大风能捕获控制策略的有效性;在光照强度以及温度变化情况下光伏发电单元进行了仿真研究,表明了光伏发电系统能够根据外界天气条件的变化始终保持系统运行在最大功率点,验证了模型的有效性。为了克服线性PI控制策略的不足,提出了一种基于模糊控制理论的改进型功率波动平抑控制策略,给出了模糊控制的基本原理、基本结构和实现过程,通过仿真软件分别对未加入和加入功率波动平抑控制策略进行了仿真研究。仿真结果表明采用新型功率波动平抑控制策略能够获得更好的动态响应性能以及抗扰动能力。
[Abstract]:Energy crisis and environmental pollution have attracted wide attention from all countries in the world. Developing renewable energy generation system is the key technology to solve the above problems. Wind and solar power generation is an important development direction of renewable energy. With the rapid development of wind power and photovoltaic power generation, its installed capacity is rapidly rising. As the output power of wind power generation system is very sensitive to weather change, it has the characteristics of randomness and intermittency. The access of large-scale intermittent energy to traditional power system will have adverse effects on the power and frequency of network nodes. In order to solve this problem, the energy storage device is usually configured to suppress intermittent energy output in the wind power generation system. The power fluctuation of the power system is used to improve the power quality of the system. This paper focuses on the wind and solar energy storage system as the research object, focuses on the application technology of the energy storage device in the wind and wind system, and puts forward the improved control strategy for the power fluctuation of the energy storage system, and establishes the PV power generation system, the direct drive permanent magnet synchronous wind power generation system and the direct drive system. The mathematical model of the battery energy storage system, the output characteristics of the photovoltaic cells and wind turbines are given. The influence of the light and temperature changes on the electrical characteristics of the photovoltaic cells is analyzed. At the same time, the influence of the wind speed and the change of the pitch angle on the torque and output power is analyzed. The equivalent circuit of the battery is given, and the battery charging and discharging is given. The whole process is analyzed. According to the functions of different converters in the renewable energy generation system, the control strategy of the photovoltaic power system and the power electronic device in the wind power generation system is formulated. The control structure of the system is given and the detailed analysis is made. The outer ring of the PWM converter is designed by the typical I type and the II type system. The PI parameters of the inner ring are used to build the simulation model of the wind power system and the photovoltaic power generation system through the simulation software. The simulation of wind power system is carried out under the wind speed change. The effectiveness of the maximum wind energy capture control strategy is verified. The photovoltaic power unit is simulated under the light intensity and the temperature change. The real research shows that the PV system can keep the system running at the maximum power point according to the change of the weather conditions, and verify the validity of the model. In order to overcome the shortage of the linear PI control strategy, an improved power wave suppression control strategy based on fuzzy control theory is proposed, and the base of fuzzy control is given. This principle, the basic structure and the implementation process are simulated by simulation software. The simulation results show that the new power fluctuation reduction control strategy can obtain better dynamic response performance and anti disturbance ability.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM61

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