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微网系统并网/孤岛运行模式无缝切换控制策略

DOI: 10.13334/j.0258-8013.pcsee.2014.19.007, PP. 3089-3097

Keywords: 微网,主从控制,并网运行,孤岛运行,无缝切换

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Abstract:

对于采用主从控制策略的微网系统,如何实现并网/孤岛工作模式之间的无缝切换是一项亟待克服的技术难点。首先介绍微网系统的基本结构和工作模式,结合微网系统并网/孤岛工作模式切换时的工作特征,提出一种改进的电压环调节器结构。即根据能量守恒原则,在工作模式切换前预先估算并设置调节器的输出需求,可较好地解决切换过程中微网母线电压的震荡和电流冲击等问题。其次,提出一种适合微网的软件锁相方法,保证各种切换条件下微网母线电压相位的连续性和平顺性,为不同工作模式间的无缝切换奠定基础,并对储能变流器的控制参数进行了优化设计。最后,建立微网系统的仿真模型和完善的实验验证平台,仿真和实验结果共同验证了所提控制策略和锁相方法的有效性和优越性。

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