共查询到18条相似文献,搜索用时 156 毫秒
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微电网是一种可控的小型发电配电系统,是将分布式电源、负荷、储能以及控制装置进行结合,能够对大电网和分布式电源两者之间的矛盾进行有效的解决,从而不断的推动分布式发电技术的发展和进步.但是分布式电源单机接入成本高、控制困难,一定程度上限制了其大规模的使用.为了确保含多种分布式电源的微电网的稳定运行,必须对分布式电源及其相应的电力电子接口设备进行有效的控制.本文结合笔者多年工作经验,阐述了含多种分布式电源的微电网控制策略. 相似文献
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新能源微电网综合实验平台集成了多种分布式发电与储能装置,其结构灵活多变,可满足不同运行方式的需求.本文介绍了该实验平台系统架构与硬件组成,以及集中式管理系统,并选取三类代表性运行模式进行介绍.借助该综合实验平台设计了分布式电源运行特性验证、并网逆变器控制策略设计、并离网状态切换、运行优化策略验证等实验,通过教学实践增强学生对分布式电源、微电网系统的认知与理解. 相似文献
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《电子技术与软件工程》2016,(1)
针对微电网并网运行切换至计划孤岛运行时负荷侧暂态振荡,提出一种孤岛无缝切换策略,有效降低负荷侧电压与频率振荡幅度。含多分布式能源的微电网孤岛运行时采用主从控制结构,主逆变器从P-Q控制切换至V-f控制,用于稳定负荷侧电压与频率。从逆变器采用P-Q控制,稳定系统内有功功率平衡。孤岛切换时,主逆变器采用状态跟踪控制,削弱因逆变器控制策略切换导致的输出不稳定性。基于PSCAD的仿真实验表明,该控制策略可有效降低孤岛切换瞬间负荷侧的电压与频率振荡,提高微电网供电稳定性。 相似文献
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针对传统并网硬开关无法主动调节潮流的问题,利用背靠背变流器取代传统并网硬开关,对配电网与微电网进行柔性互联,便于二者之间的协调控制。为对系统进行稳定性分析,并考虑到不同规模的微网内分布式电源数量的不同,文中建立一种经背靠背变流器接入的含N个分布式电源的微网小信号状态空间模型框架。利用MATLAB对其进行特征值分析,确定了影响微电网稳定性和动态性能的关键参数。在PSCAD/EMTDC平台上搭建出基于下垂控制的微电网柔性并网运行模型,将建立的小信号模型与搭建的仿真模型结合,在多个工况下进行仿真,验证了建模、分析与结论的正确性。 相似文献
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微电网与分布式发电微电网可被看作一个小型电力系统,它由负荷和分布式电源(简称为微电源)组成。它将电力生产所需的电力装置适当地结合成为一个可控单元,然后通过公共耦合点(Point of Common Coupling,PCC)与大电网相连。因此,微电网既可并网运行,也可在适当的时候脱离主网孤岛运行。此种运行方式克服了传统分布式电源不可控的缺点,能有效促进可再生能源的接入和利用,有利于智能电 相似文献
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Yun Wei Li Vilathgamuwa D.M. Poh Chiang Loh 《Power Electronics, IEEE Transactions on》2006,21(4):1021-1031
This paper proposes a grid-interfacing power quality compensator for three-phase three-wire microgrid applications with consideration of both the power quality of the microgrid and the quality of currents flowing between the microgrid and utility system. It is proposed that two inverters connected in shunt and series are used for each distributed generation (DG) system in the microgrid. In each inverter, both positive- and negative-sequence components are controlled to compensate for the effects caused by the unbalanced utility grid voltages. Specifically, the shunt inverter is controlled to ensure balanced voltages within the microgrid and to regulate power dispatches among parallel-connected DG systems, while the series inverter balances the line currents by injecting appropriate voltage components. A current-limiting algorithm is also proposed and integrated within the inverter control schemes to protect the microgrid from large fault currents during utility voltage sags. The proposed compensator has been tested in simulations and experimentally using a laboratory hardware prototype. 相似文献
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Sangmin Jung Youngsang Bae Sewan Choi Hyosung Kim 《Power Electronics, IEEE Transactions on》2007,22(6):2293-2298
This paper presents the development of a single-phase utility-interactive inverter for residential power generation to meet the specifications laid down for the 2005 Future Energy Challenge Competition sponsored by U.S. DOE and IEEE. The proposed inverter system is capable of working in both stand-alone and grid-connected mode. A control scheme for implementing both modes of operation is presented, which has simple structure with smaller number of sensors. The proposed control algorithm including the whole system control is implemented on a low cost, fixed-point DSP TMS320F2812. The experimental results from a 1 kW prototype show that the proposed inverter system exhibits not only low THD grid current during the grid-connected mode and well regulated inverter voltage during the stand-alone mode, but also smooth and automatic transfer between the two modes of operation. 相似文献
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考虑需求侧响应的微网并网运行机制能够引导用户合理用电,对研究智能电网用户用电福利具有重要意义。综合光伏、风能发电的不稳定性,提出微网并网运行机制下需求侧响应策略,以微网运行成本最小和需求侧用电效用最大为目标,建立了考虑需求侧响应的微网并网运行福利模型。仿真结果表明所建立的模型可达到用户最大用电福利,且有利于削峰填谷,降低供电压力,提升用户参与建设微网的积极性。 相似文献
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解决微电网中新能源出力存在的随机性与波动性是微电网优化运行的前提和关键。文中将鲁棒优化理论引入到微电网的运行优化中,以运行成本和环境成本为目标构建了含有风力发电、微型燃气轮机、配电网和蓄电池的微电网多目标鲁棒优化模型,并采用基于自然选择粒子群算法对模型进行求解。仿真结果表明,与传统确定性优化相比,鲁棒优化虽然牺牲了经济性,但换取微电网运行的可靠性,平衡了成本与风险的关系;同时多目标优化平衡了微电网的经济性和环保性,为微电网的优化运行提供了参考。 相似文献
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Chen C.-L. Wang Y. Lai J.-S. Lee Y.-S. Martin D. 《Power Electronics, IEEE Transactions on》2010,25(1):6-15