哈尔滨工业大学工学硕士学位论文
Abstract
Nowadays, renewable energy power generation has been developed rapidly. As an important part of renewable energy power generation, energy storage system plays a role in stabilizing power fluctuation and maintaining bus voltage stability. Traditional battery energy storage has low power density and short cycle life and other shortcomings, so the cost of energy storage system is higher. The hybrid energy storage system has been developed rapidly because of its low cost and comprehensive performance. The control of the hybrid energy storage system and the allocation of energy are the key technical problems. They determine whether the hybrid energy storage system can give full play to its performance characteristics and service life. It is also the focus of this dissertation.
In this dissertation, lithium battery and super capacitor composed of hybrid energy storage system for the study. Firstly, the DC-side access mode of the hybrid energy storage system is determined. Based on the characteristics of the load of the hybrid energy storage system, the active connection mode and the bidirectional buck / boost topology of the energy storage system are established. The equivalent model of lithium battery and super capacitor are established. This dissertation analyzes the influencing factors of circulating life of lithium batteries, which lays the foundation for the following control methods and energy management strategy.
A small signal model of bidirectional buck/boost circuit is established by using the state space averaging method. The advantages and disadvantages of the two control methods in the hybrid energy storage system are analyzed. Finally, the converter of the lithium battery is controlled by single current closed loop and different controller is designed at different charge and discharge state, to accurately track the upper power command. super capacitor bi-directional converter using voltage and current double closed-loop control method to maintain the bus voltage stability and power balance. And a state of charge judgment module is added to the controller, which can ensure the lithium battery maintain bus voltage stability and power balance when the super capacity out of state. The parameters of the controllers are designed by frequency design method, and the effectiveness of the converter control method is verified by simulation in MATLAB.
According to the performance characteristics of lithium batteries and super
哈尔滨工业大学工学硕士学位论文
capacitors, an energy management program is designed. A power distribution method is designed, which combine low-pass filter method with multi-objective optimization method. On the one hand the lithium battery assume a smaller smooth power to extend its life, on the other hand make full use of the capacity of super capacitors to reduce the loss of transmission process. At the same time, state management is added to the energy storage system, including overcharge and over discharge protection and maximum power limit protection, which can ensure the safe operation of hybrid energy storage system. In MATLAB, the proposed scheme is compared with the traditional scheme. The simulation results show the effectiveness of the proposed scheme.
A hybrid storage system experimental platform and the corresponding control program are designed with DSP28335 as the control chip, to verify the effectiveness of the control method and energy management scheme designed in this dissertation. The experimental results show the effectiveness of the designed energy management program.
Keywords: hybrid energy storage system; power fluctuation stabilization;
multi-objective optimization; state management
哈尔滨工业大学工学硕士学位论文
目录
摘要................................................................................................................. I ABSTRACT ....................................................................................................... I I 第1章绪论 .. (1)
1.1课题背景及意义 (1)
1.2储能技术发展现状及选择 (2)
1.3混合储能技术发展现状及分析 (4)
1.3.1 国外研究现状 (5)
1.3.2 国内研究现状 (6)
1.4主要研究内容 (7)
第2章混合储能系统结构确定及能量管理方案设计 (9)
2.1引言 (9)
2.2混合储能系统结构确定 (9)
2.2.1 混合储能系统接入方式 (9)
2.2.2 混合储能元件连接方式 (10)
2.2.3 双向变换器拓扑选择及原理分析 (12)
2.3混合储能系统能量管理方案设计 (14)
2.3.1 混合储能系统能量管理设计 (15)
2.3.2 双向变换器控制方法设计 (15)
2.4本章小结 (17)
第3章混合储能系统模型及控制 (18)
3.1引言 (18)
3.2混合储能系统模型建立 (18)
3.2.1 锂电池等效模型 (18)
3.2.2 超级电容等效模型 (20)
3.2.3 混合储能中双向变换器小信号模型 (21)
3.3双向变换器元件参数及调节器参数设计 (23)
3.3.1 双向变换器元件参数设计 (23)
3.3.2 调节器参数设计 (25)
3.4混合储能系统主电路控制的仿真与分析 (29)
3.4.1 混合储能系统仿真模型 (29)
哈尔滨工业大学工学硕士学位论文
3.4.2 双向变换器仿真与分析 (30)
3.5本章小结 (34)
第4章混合储能系统能量管理方案及仿真分析 (35)
4.1引言 (35)
4.2基于低通滤波的多目标优化功率分配策略 (35)
4.2.1 低通滤波算法 (35)
4.2.2 多目标优化算法 (36)
4.3混合储能系统过充过放保护 (38)
4.4最大功率限制保护 (40)
4.5能量管理方案仿真与分析 (41)
4.5.1 仿真模型建立 (41)
4.5.2 仿真结果及分析 (43)
4.6本章小结 (46)
第5章混合储能系统能量管理实测及分析 (47)
5.1引言 (47)
5.2混合储能系统电路搭建 (47)
5.2.1 主功率电路设计及主控芯片选择 (48)
5.2.2 驱动电路设计 (48)
5.2.3 采样电路设计 (49)
5.3软件设计 (50)
5.3.1 主函数程序及采样程序设计 (50)
5.3.2 功率分配方案及双向变换器控制方法程序设计 (51)
5.4混合储能系统平台搭建及实验验证 (52)
5.4.1 双向变换器控制实验 (53)
5.4.2 能量管理方案实验验证 (55)
5.5本章小结 (57)
结论 (58)
参考文献 (59)
哈尔滨工业大学学位论文原创性声明和使用权限 (63)
致谢 (64)