微电网继电保护和协同控制研究
发布时间：2019-02-12 19:02
【摘要】：为了应对环境恶化、化石能源枯竭以及充分利用清洁能源等一系列问题,微电网得到了快速发展,并将成为未来电网的一种重要供电方式。其中,微电网保护始终是研究重点。现阶段微电网的保护还处在发展阶段,同时适用于微电网并网运行和孤岛运行的保护配置还不够完善。目前微电网中的光伏发电、风力发电等微电源运用最多的是双环PI控制,但这种控制方法渐渐不能满足系统对动态特性的要求。因此,为微电网设计完善的继电保护系统以及研究微电网新的控制方法具有重要意义。首先研究了微电网继电保护,设计了微电网保护配置方案。微电网保护由主保护和后备保护组成。主保护包括母线弧光保护以及距离保护加功率方向元件。距离保护作为启动元件,采用全阻抗继电器按距离保护第Ⅲ段整定,功率方向元件用于判断故障区域。整个微电网的后备保护采用集中式后备保护,所有支路和母线的保护装置将母线电压、支路电流和弧光信号都传输给集中式后备保护的主机,主机通过接收的数据进行计算和故障判断,延时动作。设计了以DSP F28335为核心的微电网保护样机,实现了样机硬件和软件的主要功能。为了用RT-LAB实时仿真器进行微电网保护样机的硬件在环半实物实时仿真实验,在RT-LAB装置上建立了微电网的Simulink模型,将微电网保护样机与RT-LAB装置相连。半实物实时仿真实验验证了样机的性能,配置的保护能正确动作,能快速、可靠、有选择性地切除微电网故障。将协同控制方法用于微电网的控制。首先导出了两级光伏发电系统的微分-代数方程。并网光伏发电系统正常运行和低电压穿越时采用不同的控制方案,推导了这两种控制方案的协同控制算法。在并网光伏发电系统的Simulink模型中增加协同控制模块,进行了正常运行和低电压穿越仿真。然后仿真分析了由光伏发电和蓄电池储能系统组成的并网光储微电网的协同控制。本文设计的微电网保护功能比较全面,对微电网保护装置的研制有借鉴作用。微电网协同控制的研究探索了一种新的微电网控制方法,使并网光储微电网在正常运行和低电压穿越时都有良好的性能。
[Abstract]:In order to deal with a series of problems, such as environmental deterioration, fossil energy depletion and making full use of clean energy, microgrid has been developed rapidly and will become an important power supply mode in the future power grid. Among them, microgrid protection is always the focus of research. At present, the protection of microgrid is still in the development stage, and the protection configuration suitable for the grid connection and islanding operation is not perfect at the same time. At present, the dual-loop PI control is widely used in photovoltaic power generation, wind power generation and other micro-power sources in microgrid, but this control method can not meet the requirements of the dynamic characteristics of the system. Therefore, it is of great significance to design a perfect relay protection system for microgrid and to study the new control method of microgrid. Firstly, the microgrid relay protection is studied, and the configuration scheme of microgrid protection is designed. Microgrid protection consists of main protection and backup protection. Main protection includes busbar arc protection and distance protection plus power directional element. The range protection is used as the starting element, the full impedance relay is used to set the third section of the distance protection, and the power direction element is used to judge the fault area. The whole microgrid backup protection adopts centralized backup protection. All branches and busbar protection devices transmit bus voltage, branch current and arc light signal to the host of centralized backup protection. Host through the data received to calculate and fault judgment, delay action. The prototype of microgrid protection based on DSP F28335 is designed, and the main functions of hardware and software are realized. In order to use RT-LAB real-time simulator to simulate the hardware in loop of microgrid protection prototype, the Simulink model of microgrid is established on RT-LAB device, and the microgrid protection prototype is connected with RT-LAB device. The performance of the prototype is verified by the hardware-in-the-loop real-time simulation experiment. The configured protection can operate correctly, and can remove the fault of microgrid quickly, reliably and selectively. The cooperative control method is applied to the control of microgrid. The differential-algebraic equation of two-stage photovoltaic power generation system is first derived. Different control schemes are adopted for grid-connected photovoltaic power generation system in normal operation and low voltage traversing. The cooperative control algorithms of these two control schemes are deduced. The cooperative control module is added to the Simulink model of grid-connected photovoltaic system, and the simulation of normal operation and low voltage traversing is carried out. Then the cooperative control of grid-connected optical microgrid composed of photovoltaic generation and battery energy storage system is simulated and analyzed. The function of microgrid protection designed in this paper is quite comprehensive, which can be used for reference in the development of microgrid protection device. In this paper, a new microgrid control method is explored, which makes the grid-connected optical storage microgrid have good performance in normal operation and low voltage traversing.
【学位授予单位】：南京师范大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM77
[Abstract]:In order to deal with a series of problems, such as environmental deterioration, fossil energy depletion and making full use of clean energy, microgrid has been developed rapidly and will become an important power supply mode in the future power grid. Among them, microgrid protection is always the focus of research. At present, the protection of microgrid is still in the development stage, and the protection configuration suitable for the grid connection and islanding operation is not perfect at the same time. At present, the dual-loop PI control is widely used in photovoltaic power generation, wind power generation and other micro-power sources in microgrid, but this control method can not meet the requirements of the dynamic characteristics of the system. Therefore, it is of great significance to design a perfect relay protection system for microgrid and to study the new control method of microgrid. Firstly, the microgrid relay protection is studied, and the configuration scheme of microgrid protection is designed. Microgrid protection consists of main protection and backup protection. Main protection includes busbar arc protection and distance protection plus power directional element. The range protection is used as the starting element, the full impedance relay is used to set the third section of the distance protection, and the power direction element is used to judge the fault area. The whole microgrid backup protection adopts centralized backup protection. All branches and busbar protection devices transmit bus voltage, branch current and arc light signal to the host of centralized backup protection. Host through the data received to calculate and fault judgment, delay action. The prototype of microgrid protection based on DSP F28335 is designed, and the main functions of hardware and software are realized. In order to use RT-LAB real-time simulator to simulate the hardware in loop of microgrid protection prototype, the Simulink model of microgrid is established on RT-LAB device, and the microgrid protection prototype is connected with RT-LAB device. The performance of the prototype is verified by the hardware-in-the-loop real-time simulation experiment. The configured protection can operate correctly, and can remove the fault of microgrid quickly, reliably and selectively. The cooperative control method is applied to the control of microgrid. The differential-algebraic equation of two-stage photovoltaic power generation system is first derived. Different control schemes are adopted for grid-connected photovoltaic power generation system in normal operation and low voltage traversing. The cooperative control algorithms of these two control schemes are deduced. The cooperative control module is added to the Simulink model of grid-connected photovoltaic system, and the simulation of normal operation and low voltage traversing is carried out. Then the cooperative control of grid-connected optical microgrid composed of photovoltaic generation and battery energy storage system is simulated and analyzed. The function of microgrid protection designed in this paper is quite comprehensive, which can be used for reference in the development of microgrid protection device. In this paper, a new microgrid control method is explored, which makes the grid-connected optical storage microgrid have good performance in normal operation and low voltage traversing.
【学位授予单位】：南京师范大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM77
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