基于钒电池的储能供电系统控制策略设计
发布时间：2018-10-24 20:11
【摘要】：电能对整个社会的发展起着重要作用,不论是生产还是生活,突然断电都会带来严重后果,影响正常社会秩序。尤其是生产生活中的重要设施,如医院、炼钢厂等,如果发生停电情况,将造成重大的政治影响和经济损失。本文研究了一种新的储能供电系统。系统在储能方面采用钒电池储能为主,铅酸电池储能为辅的结构;变换器方面采用双向变换器,实现一机两用;控制方面通过改进能量控制算法,优化了能量调度,提高了系统使用寿命和供电可靠性,并且有利于系统模块化和容量扩充。论文首先介绍了新型全钒液氧化还原电池储能技术,并对电池进行研究分析,建立了等效损耗仿真模型,动态的模拟了电池充放电过程中主要参数变化。在对电池特性研究的基础上设计了电池充放电所需的双向接口变换器。在分析对比几中常用拓扑后选择了结构简单、功率器件电气应力较小的双向半桥Buck/Boost作为变换器拓扑。其次,论文基于钒电池储能供电模块,提出了整个储能供电系统结构。其中铅酸电池及其接口变换器组成辅助储能供电模块,配合钒电池储能供电模块工作。而双向DC-AC变换器在电网有电时和电网一起组成供电模块给储能单元充电;在电网断电时,和交流负载一起组成负载模块,由储能模块进行供电。针对系统中电网,钒电池,铅酸电池,负载之间的多种能量供需状态,系统需要对各模块进行能量管理控制。考虑到系统共直流母线结构,论文参考并改进了直流母线电压信号控制算法并应用改进后的算法对系统工作模态进行了划分,并分析了模态之间的相互转换。论文在改进后的能量管理控制策略下针对各接口变换器进行了控制框图设计。其中DC-DC变换器采用了电压外环叠加电流内环共用的控制结构,实现了工作模态无缝切换,但带来了PI控制器退饱和问题,论文通过引入抗积分数字PI解决了PI退饱和问题。DC-AC变换器因并离网工作模态差异大,论文分别进行了独立设计。对应控制框图,在变换器数学建模基础上,论文结合系统具体参数在离散域设计了控制器参数。最后建立了Matlab/simulink仿真模型,对前面的理论分析结果和控制策略设计进行了仿真验证,证明了理论分析的正确性和控制策略的有效性。
[Abstract]:Electric energy plays an important role in the development of the whole society. Whether it is production or life, sudden power failure will bring serious consequences and affect the normal social order. In particular, important facilities in production and life, such as hospitals, steel mills and so on, will cause great political impact and economic losses if power failure occurs. In this paper, a new energy storage power supply system is studied. The system adopts the structure of vanadium battery as the main energy storage, lead-acid battery as the auxiliary energy storage; the converter adopts the bidirectional converter to realize a dual purpose; in the control aspect, the energy scheduling is optimized by improving the energy control algorithm. The system service life and power supply reliability are improved, and it is beneficial to modularization and capacity expansion of the system. In this paper, the energy storage technology of a new type of vanadium redox battery is introduced, and the battery is studied and analyzed, and the simulation model of equivalent loss is established, and the main parameters of the battery during charge and discharge are simulated dynamically. Based on the study of battery characteristics, a bidirectional interface converter for battery charging and discharging is designed. After analyzing and comparing several common topologies, bidirectional half-bridge Buck/Boost with simple structure and low electrical stress of power devices is selected as converter topology. Secondly, based on the energy storage and power supply module of vanadium battery, the structure of the whole energy storage system is proposed. Lead acid battery and its interface converter form auxiliary energy storage power supply module and work with vanadium battery energy storage power supply module. The bi-directional DC-AC converter forms a power supply module to charge the energy storage unit together with the grid when the power is available, and when the power is off, it forms a load module together with the AC load, which is powered by the energy storage module. In view of the various energy supply and demand states between power grid, vanadium battery, lead acid battery and load, the system needs to control the energy management of each module. Considering the common DC bus structure of the system, this paper refers to and improves the DC bus voltage signal control algorithm, and applies the improved algorithm to partition the operating modes of the system, and analyzes the interconversion between the modes. In this paper, the control block diagram of each interface converter is designed under the improved energy management control strategy. The DC-DC converter adopts the common control structure of voltage outer loop superposition current inner loop to realize the seamless switching of working mode, but it brings the problem of desaturation of PI controller. In this paper, the problem of PI desaturation is solved by introducing anti-integration digital PI. The DC-AC converter is designed independently because of the large difference in the mode of operation. Corresponding to the control block diagram, the controller parameters are designed in discrete domain based on the mathematical modeling of the converter. Finally, the Matlab/simulink simulation model is established, and the simulation results and control strategy design are verified, which proves the correctness of the theoretical analysis and the effectiveness of the control strategy.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM912;TM46
本文编号：2292426
[Abstract]:Electric energy plays an important role in the development of the whole society. Whether it is production or life, sudden power failure will bring serious consequences and affect the normal social order. In particular, important facilities in production and life, such as hospitals, steel mills and so on, will cause great political impact and economic losses if power failure occurs. In this paper, a new energy storage power supply system is studied. The system adopts the structure of vanadium battery as the main energy storage, lead-acid battery as the auxiliary energy storage; the converter adopts the bidirectional converter to realize a dual purpose; in the control aspect, the energy scheduling is optimized by improving the energy control algorithm. The system service life and power supply reliability are improved, and it is beneficial to modularization and capacity expansion of the system. In this paper, the energy storage technology of a new type of vanadium redox battery is introduced, and the battery is studied and analyzed, and the simulation model of equivalent loss is established, and the main parameters of the battery during charge and discharge are simulated dynamically. Based on the study of battery characteristics, a bidirectional interface converter for battery charging and discharging is designed. After analyzing and comparing several common topologies, bidirectional half-bridge Buck/Boost with simple structure and low electrical stress of power devices is selected as converter topology. Secondly, based on the energy storage and power supply module of vanadium battery, the structure of the whole energy storage system is proposed. Lead acid battery and its interface converter form auxiliary energy storage power supply module and work with vanadium battery energy storage power supply module. The bi-directional DC-AC converter forms a power supply module to charge the energy storage unit together with the grid when the power is available, and when the power is off, it forms a load module together with the AC load, which is powered by the energy storage module. In view of the various energy supply and demand states between power grid, vanadium battery, lead acid battery and load, the system needs to control the energy management of each module. Considering the common DC bus structure of the system, this paper refers to and improves the DC bus voltage signal control algorithm, and applies the improved algorithm to partition the operating modes of the system, and analyzes the interconversion between the modes. In this paper, the control block diagram of each interface converter is designed under the improved energy management control strategy. The DC-DC converter adopts the common control structure of voltage outer loop superposition current inner loop to realize the seamless switching of working mode, but it brings the problem of desaturation of PI controller. In this paper, the problem of PI desaturation is solved by introducing anti-integration digital PI. The DC-AC converter is designed independently because of the large difference in the mode of operation. Corresponding to the control block diagram, the controller parameters are designed in discrete domain based on the mathematical modeling of the converter. Finally, the Matlab/simulink simulation model is established, and the simulation results and control strategy design are verified, which proves the correctness of the theoretical analysis and the effectiveness of the control strategy.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM912;TM46
【参考文献】
相关期刊论文 前2条
1 张犁;孙凯;吴田进;邢岩;;基于光伏发电的直流微电网能量变换与管理[J];电工技术学报;2013年02期
2 廖志凌;阮新波;;独立光伏发电系统能量管理控制策略[J];中国电机工程学报;2009年21期
，本文编号：2292426
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