独立光伏发电混合储能系统能量管理研究

发布时间：2018-03-01 01:20

本文关键词： 光伏发电系统混合储能能量管理非线性协同控制　出处：《燕山大学》2014年硕士论文　论文类型：学位论文

【摘要】：由于光伏发电系统输出功率具有波动性的缺点,需要增加能量储存装置来抑制这些波动,才能保证光伏系统的稳定运行。系统功率的频繁波动将会缩短蓄电池的寿命，因此，传统的单一蓄电池储能已不再适应储能系统的发展需要。超级电容是一种新的能量储存元件，具有高功率密度和寿命长的优点。本文针对独立光伏发电系统中超级电容蓄电池混合储能系统的能量管理和变换器控制方法两个关键问题进行了研究。本文分析了光伏发电系统中混合储能的优越性，根据系统中光伏电池、超级电容器和蓄电池三者的不同工作状态，研究了一种能量管理策略。在该能量管理策略中，利用超级电容首先动作来抑制系统中的功率波动，充分利用了其快速性好的优点。蓄电池采用恒流充放电的控制方式进行充放电，来实现系统中能量的平衡。在光伏电池和混合储能元件的不同工作状态下，通过能量管理单元的管理使光伏电池和混合储能元件在不同模式下协调工作，从而实现系统的稳定运行。本文对所提出的能量管理策略用MATLAB软件进行了仿真验证，结果表明混合储能系统在光伏系统输出功率和负载端功率变化时，，可以实现不同工作模式之间的切换，并能维持母线电压的恒定。当系统功率波动较小时蓄电池不动作，从而减小了其充放电次数。针对开关变换器的时变非线性会对控制器性能产生不好影响的问题，本文采用非线性协同控制方法对系统中的控制器进行控制。分别设计了超级电容稳压控制器和蓄电池恒流充放电控制器。用MATLAB软件进行了仿真验证，仿真结果表明，该控制方法具有很好的抗扰性和鲁棒性。独立搭建了系统实验平台，对本文研究的能量管理策略和控制方法进行了实验验证。实验结果表明，文中所研究的混合储能方案不仅能够有效保证直流母线电压的稳定，还可显著延长蓄电池的使用寿命，同时提高了超级电容的使用效率。
[Abstract]:Because the output power of photovoltaic power system has the disadvantage of fluctuation, it is necessary to increase energy storage device to restrain these fluctuations in order to ensure the stable operation of photovoltaic system. The frequent fluctuation of system power will shorten the life of battery, so, The traditional single battery energy storage system is no longer suitable for the development of energy storage system. It has the advantages of high power density and long life. In this paper, two key problems of energy management and converter control for hybrid storage system of super capacitor battery in independent photovoltaic power generation system are studied. In this paper, the advantages of hybrid energy storage in photovoltaic power generation system are analyzed. According to the different working states of photovoltaic cells, supercapacitors and batteries in the system, an energy management strategy is studied. The super capacitor is first used to suppress the power fluctuation in the system, which makes full use of its advantages of good rapidity. The battery uses constant current charge and discharge control mode to charge and discharge. To achieve energy balance in the system. In different working states of photovoltaic cells and hybrid energy storage elements, the photovoltaic cells and hybrid energy storage elements are coordinated in different modes through the management of energy management units. In this paper, the proposed energy management strategy is simulated by MATLAB software. The results show that the hybrid energy storage system changes in the output power and load end power of photovoltaic system. The switching between different working modes can be realized, and the bus voltage can be kept constant. When the power fluctuation of the system is small, the battery does not move, thus reducing the charge and discharge times. Aiming at the problem that the time-varying nonlinearity of switching converter will have a bad effect on the controller performance, In this paper, the nonlinear cooperative control method is used to control the controller in the system. The supercapacitor stabilized voltage controller and the battery constant current charge / discharge controller are designed, respectively. The simulation results show that the controller is verified by MATLAB software. The control method has good immunity and robustness. The system experiment platform is built independently, and the energy management strategy and control method studied in this paper are experimentally verified. The experimental results show that the hybrid energy storage scheme studied in this paper can not only effectively guarantee the stability of DC bus voltage, It can also prolong the service life of battery and improve the efficiency of super capacitor.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM615

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