含高渗透率可再生能源微电网运行控制研究
发布时间：2018-10-11 09:33
【摘要】：分布式发电是可再生能源发展的重要途径之一,而微电网是集成分布式可再生能源发电的重要形式,它具有先进灵活的运行控制模式,可以实现分布式可再生能源的高比例接入。随着能源互联网和主动配电网的发展,未来主动配电网中分布式发电和微电网必将规模化应用。含有大量可再生能源的微电网将高渗透率接入配电网,这将改变配电网的潮流分布和网络性质。分布式可再生能源间歇性随机性的特点将导致微电网并网联络线功率的剧烈变化,将给可再生能源消纳和电力系统调峰调频带来困难,同时给配电网以及上级电力网络的安全运行和优化调度带来挑战。本文基于未来主动配电网环境,以风光储微电网为研究对象,主要研究了微电网并网联络线功率控制策略。主要工作如下:1、通过对比典型的光储发电系统拓扑结构,设计了风光储微电网的拓扑结构。该结构在减少一次侧设备使用的基础上,可以充分发挥储能单元的功率调节作用和功率变换器的控制作用,提高系统运行和调度的灵活性,在满足系统供电可靠性的条件下,增加了风光储光储微电网对内部电源的可调度维度。2、在主动配电网环境下,针对风光储微电网并网联络线功率波动与调度问题,以调度周期内信息交互为基础,给出了联络线功率平滑目标与计算方法,制定了联络线功率分时恒定控制策略,可以实现微电网对对外部配电网的即插即用,以及对微电网内部分布式电源的即插即用。设计了两层分层控制结构,上层中心控制器综合考虑自身运行工况和主动配电网调度需求,实现系统运行模式的选择切换与底层控制器的协调控制;底层控制器实现微电网内供需功率的实时平衡,实现了微电网内各分布式可再生能源的功率协调控制,保证了并网联络线功率的分时恒定。3、综合考虑风光储微电网系统运行中风速与光照强度的随机变化,选取了典型的风速和光照变化条件,使系统可以在所有可能的运行状态下正常工作并且完成任意运行状态之间的平滑切换。基于上述条件,在Matlab/Simulink环境下搭建了风光储微电网功率控制策略的仿真算例,使用Stateflow工具箱制定了运行状态转换策略,实现了系统所有运行状态的正常运行和无缝连续切换,仿真结果验证了所提控制策略的正确性与有效性。
[Abstract]:Distributed generation is one of the important approaches to the development of renewable energy, and microgrid is an important form of integrated distributed renewable energy generation, which has advanced and flexible operation control mode. High proportion access to distributed renewable energy can be realized. With the development of energy Internet and active distribution network, distributed generation and microgrid in active distribution network will be applied on a large scale in the future. The microgrid with a large amount of renewable energy will be connected to the distribution network with high permeability, which will change the power flow distribution and network properties of the distribution network. The intermittent randomness of distributed renewable energy will lead to drastic changes in the connection line power of microgrid, which will make it difficult to absorb renewable energy and adjust peak and frequency of power system. At the same time, it brings challenges to the safe operation and optimal dispatching of distribution network and superior power network. In this paper, based on the future active distribution network environment, this paper mainly studies the power control strategy of the connection line of the microgrid based on the wind storage microgrid. The main work is as follows: 1. By comparing the typical topology of optical storage power generation system, the topology of the wind-storage micro-grid is designed. On the basis of reducing the use of primary side equipment, the structure can give full play to the power regulation function of energy storage unit and the control role of power converter, improve the flexibility of system operation and scheduling, and meet the condition of system power supply reliability. In the active distribution network environment, aiming at the power fluctuation and dispatching problem of the tie-line connected to the solar microgrid, it is based on the information exchange in the dispatching cycle. The smooth target and calculation method of tie-line power are given, and the tie-line power time-sharing constant control strategy is worked out, which can realize the plug and play of micro-grid to external distribution network, and to the internal distributed generation of micro-grid. A two-layer hierarchical control structure is designed. The upper central controller considers its own operation conditions and the dispatching requirements of the active distribution network synthetically, and realizes the selection and switching of the system operation mode and the coordination control of the bottom controller. The bottom controller realizes the real-time balance of power supply and demand in microgrid, and realizes the power coordination control of distributed renewable energy in microgrid. The timesharing of tie-line power is guaranteed. 3. Considering the random variation of wind speed and illumination intensity in the operation of wind-storage microgrid system, the typical wind speed and illumination variation conditions are selected. The system can work normally in all possible running states and finish smooth switching between any running states. Based on the above conditions, a simulation example of the power control strategy of the solar power storage and microgrid is built in Matlab/Simulink environment, and the operating state conversion strategy is formulated by using the Stateflow toolbox, which realizes the normal operation and seamless continuous switching of all the running states of the system. Simulation results verify the correctness and effectiveness of the proposed control strategy.
【学位授予单位】：天津工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM732
[Abstract]:Distributed generation is one of the important approaches to the development of renewable energy, and microgrid is an important form of integrated distributed renewable energy generation, which has advanced and flexible operation control mode. High proportion access to distributed renewable energy can be realized. With the development of energy Internet and active distribution network, distributed generation and microgrid in active distribution network will be applied on a large scale in the future. The microgrid with a large amount of renewable energy will be connected to the distribution network with high permeability, which will change the power flow distribution and network properties of the distribution network. The intermittent randomness of distributed renewable energy will lead to drastic changes in the connection line power of microgrid, which will make it difficult to absorb renewable energy and adjust peak and frequency of power system. At the same time, it brings challenges to the safe operation and optimal dispatching of distribution network and superior power network. In this paper, based on the future active distribution network environment, this paper mainly studies the power control strategy of the connection line of the microgrid based on the wind storage microgrid. The main work is as follows: 1. By comparing the typical topology of optical storage power generation system, the topology of the wind-storage micro-grid is designed. On the basis of reducing the use of primary side equipment, the structure can give full play to the power regulation function of energy storage unit and the control role of power converter, improve the flexibility of system operation and scheduling, and meet the condition of system power supply reliability. In the active distribution network environment, aiming at the power fluctuation and dispatching problem of the tie-line connected to the solar microgrid, it is based on the information exchange in the dispatching cycle. The smooth target and calculation method of tie-line power are given, and the tie-line power time-sharing constant control strategy is worked out, which can realize the plug and play of micro-grid to external distribution network, and to the internal distributed generation of micro-grid. A two-layer hierarchical control structure is designed. The upper central controller considers its own operation conditions and the dispatching requirements of the active distribution network synthetically, and realizes the selection and switching of the system operation mode and the coordination control of the bottom controller. The bottom controller realizes the real-time balance of power supply and demand in microgrid, and realizes the power coordination control of distributed renewable energy in microgrid. The timesharing of tie-line power is guaranteed. 3. Considering the random variation of wind speed and illumination intensity in the operation of wind-storage microgrid system, the typical wind speed and illumination variation conditions are selected. The system can work normally in all possible running states and finish smooth switching between any running states. Based on the above conditions, a simulation example of the power control strategy of the solar power storage and microgrid is built in Matlab/Simulink environment, and the operating state conversion strategy is formulated by using the Stateflow toolbox, which realizes the normal operation and seamless continuous switching of all the running states of the system. Simulation results verify the correctness and effectiveness of the proposed control strategy.
【学位授予单位】：天津工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM732
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