多能互补微网系统的优化设计及控制技术
发布时间：2018-12-07 10:52
【摘要】：煤炭等能源供应紧张的同时也造成了严重的环境污染问题,以大型火力电站为电源的常规电网难以满足用户在安全性和多样性方面的需求。对可再生能源的研究利用以及对多能互补微电网的需求日益增长,海洋能集成供电技术的研究对于远离大陆的海岛供电有着重要意义。由于海洋能等可再生能源发电的输出功率严重依赖于气候条件,电能质量不高,具有极度的间歇性及不可控性,难以满足用户需求,因此本论文依托于863项目开展,以工程项目应用为研究出发点,对海洋能集成供电系统设计优化、复合储能技术及直流微网控制技术展开了研究。本文首先分析了海洋能集成供电系统的研究课题和研究意义,分析了分布式供电系统及微电网、复合储能系统的研究背景现状及意义,按母线类型分类分析了微电网的直流微电网及交流微电网的结构及运行特性,并分析了微电网的接口电路特性,具体包括AC/DC整流电路、DC/DC双向升降压变换电路、DC/AC逆变电路等。随后搭建了多能互补直流微网系统,进行了需求分析、结构优化设计、容量配置优化,并对波浪能及潮流能发电系统及复合储能系统进行了建模分析,对相应变流器进行了结构设计及控制策略分析。设计蓄电池超级电容复合储能方案,分别分析蓄电池及超级电容的特性及等效电路模型,通过协调控制蓄电池和超级电容储能的充放电来维持系统稳定。最后提出直流微电网多电源协调控制技术。通过分析直流微电网基本控制策略,提出适用于海洋能集成供电系统的微电源及储能的控制策略及能量管理方案,对直流微网采取三层控制策略,包括微电源控制层、直流母线控制层、组网控制管理层。其中直流母线控制层采用母线电压控制方法,按电压阈值将微网工作状态划分为六个阶段,根据电压判断微电源的工作模式,对储能充放电和负载的投切进行控制,从而保证在波浪能及潮流能输出不稳定或者负载波动较大的情况下,不至于造成大的电压波动,并且最大限度的利用海洋能。并在研究基础上搭建集成供电系统实验平台,通过使用可控电源模拟波浪能及潮流能发电输出,在变负载工况下运行,实验过程中蓄电池和超级电容协调工作,稳定直流母线电压,实验结果验证了控制策略可靠性及系统稳定性。
[Abstract]:The shortage of energy supply, such as coal, has also caused serious environmental pollution. The conventional power grid with large thermal power station as the power source is difficult to meet the needs of users in safety and diversity. The research and utilization of renewable energy and the increasing demand for multi-energy complementary microgrid make the research of integrated oceanic power supply technology important for the island power supply far from the continent. Because the output power of renewable energy such as oceanic energy depends heavily on climatic conditions, the power quality is not high, and it is extremely intermittent and uncontrollable, so it is difficult to meet the needs of users. Therefore, this paper is based on the 863 project. Based on the application of engineering project, the design optimization, composite energy storage technology and DC microgrid control technology of integrated oceanic energy supply system are studied. This paper first analyzes the research topic and significance of integrated marine energy supply system, and analyzes the research background and significance of distributed power supply system, microgrid and composite energy storage system. The structure and operation characteristics of DC microgrid and AC microgrid in microgrid are analyzed according to the type of bus. The interface circuit characteristics of microgrid are analyzed, including AC/DC rectifier circuit, DC/DC bidirectional up-down voltage conversion circuit. DC/AC inverter circuit. Then, the multi-energy complementary DC micro-grid system is built, including demand analysis, structural optimization design, capacity configuration optimization, and the modeling and analysis of wave energy and tidal current generation system and composite energy storage system. The structure design and control strategy of the converter are analyzed. In order to maintain the stability of the storage system, the characteristics and equivalent circuit models of the storage battery and the super capacitor were analyzed, and the charging and discharging of the storage battery and the super capacitor were coordinated. Finally, the multi-power coordinated control technology of DC micro-grid is proposed. By analyzing the basic control strategy of DC microgrid, the control strategy and energy management scheme of micro-power supply and energy storage for integrated marine power supply system are put forward, and the three-layer control strategy is adopted for DC micro-grid, including micro-power control layer. DC bus control layer, network control management. The DC busbar control layer adopts the bus voltage control method. According to the voltage threshold, the working state of the microgrid is divided into six stages. According to the voltage, the working mode of the micro-power supply is judged, and the storage, charge, discharge and load switching are controlled. In order to ensure that the wave energy and tide energy output instability or load fluctuations, it will not cause large voltage fluctuations, and maximize the use of ocean energy. On the basis of the research, an integrated power supply system experiment platform is set up. By using controllable power supply to simulate wave energy and tidal current energy generation output, and running under variable load conditions, the battery and super capacitor work harmoniously during the experiment. The DC bus voltage is stabilized and the reliability of the control strategy and the stability of the system are verified by the experimental results.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM727
[Abstract]:The shortage of energy supply, such as coal, has also caused serious environmental pollution. The conventional power grid with large thermal power station as the power source is difficult to meet the needs of users in safety and diversity. The research and utilization of renewable energy and the increasing demand for multi-energy complementary microgrid make the research of integrated oceanic power supply technology important for the island power supply far from the continent. Because the output power of renewable energy such as oceanic energy depends heavily on climatic conditions, the power quality is not high, and it is extremely intermittent and uncontrollable, so it is difficult to meet the needs of users. Therefore, this paper is based on the 863 project. Based on the application of engineering project, the design optimization, composite energy storage technology and DC microgrid control technology of integrated oceanic energy supply system are studied. This paper first analyzes the research topic and significance of integrated marine energy supply system, and analyzes the research background and significance of distributed power supply system, microgrid and composite energy storage system. The structure and operation characteristics of DC microgrid and AC microgrid in microgrid are analyzed according to the type of bus. The interface circuit characteristics of microgrid are analyzed, including AC/DC rectifier circuit, DC/DC bidirectional up-down voltage conversion circuit. DC/AC inverter circuit. Then, the multi-energy complementary DC micro-grid system is built, including demand analysis, structural optimization design, capacity configuration optimization, and the modeling and analysis of wave energy and tidal current generation system and composite energy storage system. The structure design and control strategy of the converter are analyzed. In order to maintain the stability of the storage system, the characteristics and equivalent circuit models of the storage battery and the super capacitor were analyzed, and the charging and discharging of the storage battery and the super capacitor were coordinated. Finally, the multi-power coordinated control technology of DC micro-grid is proposed. By analyzing the basic control strategy of DC microgrid, the control strategy and energy management scheme of micro-power supply and energy storage for integrated marine power supply system are put forward, and the three-layer control strategy is adopted for DC micro-grid, including micro-power control layer. DC bus control layer, network control management. The DC busbar control layer adopts the bus voltage control method. According to the voltage threshold, the working state of the microgrid is divided into six stages. According to the voltage, the working mode of the micro-power supply is judged, and the storage, charge, discharge and load switching are controlled. In order to ensure that the wave energy and tide energy output instability or load fluctuations, it will not cause large voltage fluctuations, and maximize the use of ocean energy. On the basis of the research, an integrated power supply system experiment platform is set up. By using controllable power supply to simulate wave energy and tidal current energy generation output, and running under variable load conditions, the battery and super capacitor work harmoniously during the experiment. The DC bus voltage is stabilized and the reliability of the control strategy and the stability of the system are verified by the experimental results.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM727
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