【作者】 江峰；

【导师】 陈敏； 汪涛；

【作者基本信息】 浙江大学 ， 电气工程， 2019， 硕士

【摘要】 随着全球能源、环境问题日益突出,以及可再生能源发电技术的飞速发展,新型可再生能源发电装机容量占发电容量的比例不断增加,电力系统的结构也从传统的集中式发电转变为集中式发电与分布式发电共存。集中式发电便于集中调度、统一管理,但在异常条件下对电网的冲击较大。分布式发电大多直接接在配电网侧,距离负荷较近,通过有效的电能管理技术,分布式发电可实现即发即用,就地消纳,降低电能传输损失,提高了能源利用效率,但是也为电力系统的稳定运行带来了巨大的挑战。本文考虑在分布式能源渗透率不断增加的背景下,为解决分布式发电带来的潮流分布随机性,通过在配电网层面构建并网型微电网,利用分布式电源之间的协调控制,使其尽可能降低对电网的影响,一定程度上还能支撑电网的稳定运行。既可以通过智能开关切换为独立微电网运行,也可以切换为并网运行,运行方式较为灵活。通过对并网型微电网中储能逆变器的柔性下垂控制,能够分别实现孤岛条件下源、源之间协调控制及分散自治运行,同时并网条件下具备一定电压、频率支撑作用,并研制了10kW三相电压型逆变器,通过仿真及实验验证所提控制策略的有效性。考虑到实际并网型微电网中具有一定数量的柴油发电机电源,又针对柴油发电机在并网型微电网中的自治运行提出了相应的柔性下垂控制策略,通过设计控制器及实验平台,初步验证了方案的可行性。最后文章针对以上研究成果,利用柴油发电机与逆变器的不同特性实现了分散条件下二者之间的协调控制及分层调频、调压的需求。进一步的,依靠浙江大学工程师学院多能互补微电网实验平台,构建了包含风、光、柴、储等多种能源集一体的并网型微电网平台,利用上层控制实现系统内源-网-荷协调控制。同时文章探索了将并网型微电网应用于灾害条件下的可能,并实现了在实验现场的示范应用。更多还原

【Abstract】 With the increasingly prominent global energy and environmental problems and the rapid development of renewable energy generation technology,the proportion of new renewable energy in total energy is increasing.The structure of power system has changed from traditional centralized generation to centralized generation and distributed generation.Centralized generation is convenient for centralized dispatch and unified management,but it has a great impact on the power grid under abnormal conditions.Distributed generation is mostly directly connected to the distribution network side,which is close to the load.Through effective energy management,distributed generation can achieve immediate use,local absorption,reduce power transmission losses and improve energy efficiency,but it also brings great challenges to the stable operation of the power system.Under the background of increasing distributed energy penetration,this paper considers the construction of grid-connected micro-grid at the level of distribution network,which can be switched from smart switch to independent micro-grid operation,or to grid-connected operation,and the operation mode is more flexible.Through the flexible sag control of energy storage inverters in grid-connected microgrid,the coordinated control between sources and decentralized autonomous operation can be realized under isolated island conditions respectively.At the same time,the three-phase voltage source inverters with a certain voltage and frequency support function under grid-connected conditions are developed.The effectiveness of the proposed control strategy is verified by simulation and experiment.Considering that there are a certain number of diesel generator power supply in the actual grid-connected microgrid,and for the autonomous operation of diesel generator in the grid-connected microgrid,the corresponding flexible droop control strategy is proposed.The feasibility of the scheme is preliminarily verified by the design of controller and experimental platform.Finally,in view of the above research results,the coordinated control between the diesel generator and the inverter under decentralized conditions and the requirements of layered frequency and voltage regulation are realized by using the different characteristics of the diesel generator and the inverter.Furthermore,relying on the experimental platform of multi-energy complementary microgrid of Zhejiang University College of Engineering,a grid-connected microgrid platform with wind,light,diesel,storage and other energy sources is constructed,and the system internal-network-load coordinated control is realized by upper control.At the same time,the paper explores the possibility of applying grid-connected micro-grid to disaster conditions and realizes it.更多还原