光储联合运行建模及控制策略研究

发布时间：2018-11-18 21:40

【摘要】：随着经济的高速发展,能源匮乏和环境污染问题越来越严重,太阳能以其无污染、无限制性等特点成为了人们关注的对象,光伏发电成为全球研究的重要课题。但是光伏发电具有一定的波动性和不可控性,供电可靠性较差,对系统的稳定性带来不利影响。由于储能具有快速吞吐能量的特性,是提高光伏发电可控性程度的有效方法,本文根据蓄电池和超级电容器两者之间的特性,提出超级电容器蓄电池混合储能系统,并对光储联合发电系统的控制策略进行了研究。论文首先介绍光储联合发电系统的工作原理,在其基础上建立了基于外特性的光储联合发电的数学模型;其次对光伏发电设计了Boost升压法的MPPT控制方法实现了最大功率跟踪,并通过对双向DC/DC变换器控制实现了电池所需功率吞吐,采用PI控制改变变换器的占空比的方式来跟踪最大功率点的目标的、参考电流,提高了储能单元的性能,同时针对系统中含光伏电池、超级电容器和蓄电池三种能量源的特点,提出相应的能量管理策略;最后对提出的光储联合发电系统的控制策略进行了仿真验证,结果表明混合储能系统能在外界环境发生变化时可以快速保持直流母线电压平衡,同时可以减小蓄电池容量配置,延长系统使用寿命。
[Abstract]:With the rapid development of economy, the problem of energy shortage and environmental pollution is becoming more and more serious. Solar energy has become the object of attention because of its non-pollution and unrestricted characteristics. Photovoltaic power generation has become an important topic in global research. However, photovoltaic power generation has some volatility and uncontrollability, and the reliability of power supply is poor, which has a negative impact on the stability of the system. Because the energy storage has the characteristic of fast swallowing and puffing energy, it is an effective method to improve the controllability of photovoltaic power generation. According to the characteristics of storage battery and super capacitor, a hybrid energy storage system for super capacitor battery is proposed in this paper. The control strategy of optical storage combined generation system is also studied. Firstly, the working principle of optical storage combined generation system is introduced, and the mathematical model of optical storage combined generation system based on external characteristics is established. Secondly, the MPPT control method of Boost boost method is designed for photovoltaic power generation to realize maximum power tracking, and the power huff and puff of the battery is realized by controlling the bidirectional DC/DC converter. Using PI control to change the duty cycle of the converter to track the target of the maximum power point, the reference current is used to improve the performance of the energy storage unit. At the same time, the system includes three kinds of energy sources: photovoltaic cell, supercapacitor and battery. Put forward the corresponding energy management strategy; Finally, the simulation results show that the hybrid energy storage system can maintain DC bus voltage balance quickly and reduce the storage battery capacity when the external environment changes. Extend the service life of the system.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM61

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