具有储能环节的直流微网系统自主式控制的研究
发布时间：2018-12-14 06:59
【摘要】：直流微网系统由于具有能量转换环节少，线路损耗小，，系统效率高，控制简单等优点，已经成为目前的研究热点。储能系统作为直流微电网的核心单元之一，对供电可靠性、电能质量、可再生能源发电利用率等都起至关重要的作用。 本文以包含蓄电池储能环节的直流微网系统作为研究对象，提出了一种保证系统经济运行的基于直流母线电压的自主式控制的一般性方法。该方法适用于没有通信线路的直流微网系统控制方法的设计，利用该方法设计的控制策略能够确保系统稳定可靠运行，并且优化了系统的经济性能，并通过MATLAB/Simulink验证了该方法的有效性。 蓄电池是决定微网可靠运行的关键环节。对蓄电池外特性进行研究，建立其精确模型对于蓄电池单元的有效管理及增强微网系统可靠性非常关键，然而已有的蓄电池外特性模型不适用于微网系统控制方法的研究。本文搭建了蓄电池特性测试的实验平台，在此基础上，对铅酸蓄电池的外特性展开研究，提出了一种简单的电池外特性的建模方法，并建立了放电和充电电压特性模型。该模型不仅能够较准确的反映电池电压的非线性变化规律，而且可以准确的估计电池的充放电状态。 利用建立的蓄电池外特性模型对直流微网系统中蓄电池单元的控制方法进行了优化，简单的实现了电池的有效管理；对基于直流母线电压的自主式控制方法进行了完善，系统中增加了考虑蓄电池容量为有限的情况下的运行模式。通过MATLAB/Simulink验证了优化后的蓄电池的控制方法及基于蓄电池优化控制的直流微网自主式控制方法的有效性。
[Abstract]:DC microgrid system has become a research hotspot because of its advantages of less energy conversion, less line loss, high system efficiency and simple control. As one of the core units of DC microgrid, energy storage system plays an important role in power supply reliability, power quality, renewable energy generation efficiency and so on. In this paper, the DC microgrid system which includes storage energy link of battery is taken as the research object, and a general method of independent control based on DC bus voltage is proposed to ensure the economical operation of the system. This method is suitable for the design of the control method of DC microgrid system without communication line. The control strategy designed by this method can ensure the stable and reliable operation of the system and optimize the economic performance of the system. The effectiveness of the method is verified by MATLAB/Simulink. Battery is the key to determine the reliable operation of microgrid. The research on the external characteristics of the battery is very important for the effective management of the battery unit and the enhancement of the reliability of the microgrid system. However, the existing models of the external characteristics of the battery are not suitable for the study of the control methods of the microgrid system. In this paper, an experimental platform for battery characteristic testing is built. On the basis of this, the external characteristics of lead-acid battery are studied, a simple modeling method of battery external characteristics is proposed, and a discharge and charging voltage characteristic model is established. The model can not only accurately reflect the nonlinear variation of the battery voltage, but also accurately estimate the charge and discharge state of the battery. The control method of the battery unit in the DC microgrid system is optimized by using the external characteristic model of the battery, and the effective management of the battery is realized simply. The autonomous control method based on DC bus voltage is improved, and the operation mode considering the limited capacity of battery is added in the system. The effectiveness of the optimized battery control method and the DC micro-grid autonomous control method based on the battery optimization control is verified by MATLAB/Simulink.
【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】：TM912
本文编号：2378144
[Abstract]:DC microgrid system has become a research hotspot because of its advantages of less energy conversion, less line loss, high system efficiency and simple control. As one of the core units of DC microgrid, energy storage system plays an important role in power supply reliability, power quality, renewable energy generation efficiency and so on. In this paper, the DC microgrid system which includes storage energy link of battery is taken as the research object, and a general method of independent control based on DC bus voltage is proposed to ensure the economical operation of the system. This method is suitable for the design of the control method of DC microgrid system without communication line. The control strategy designed by this method can ensure the stable and reliable operation of the system and optimize the economic performance of the system. The effectiveness of the method is verified by MATLAB/Simulink. Battery is the key to determine the reliable operation of microgrid. The research on the external characteristics of the battery is very important for the effective management of the battery unit and the enhancement of the reliability of the microgrid system. However, the existing models of the external characteristics of the battery are not suitable for the study of the control methods of the microgrid system. In this paper, an experimental platform for battery characteristic testing is built. On the basis of this, the external characteristics of lead-acid battery are studied, a simple modeling method of battery external characteristics is proposed, and a discharge and charging voltage characteristic model is established. The model can not only accurately reflect the nonlinear variation of the battery voltage, but also accurately estimate the charge and discharge state of the battery. The control method of the battery unit in the DC microgrid system is optimized by using the external characteristic model of the battery, and the effective management of the battery is realized simply. The autonomous control method based on DC bus voltage is improved, and the operation mode considering the limited capacity of battery is added in the system. The effectiveness of the optimized battery control method and the DC micro-grid autonomous control method based on the battery optimization control is verified by MATLAB/Simulink.
【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】：TM912
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