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基于μ综合方法的光伏发电系统柔性并入微网的鲁棒控制

DOI: 10.13334/j.0258-8013.pcsee.2014.28.012, PP. 4847-4854

Keywords: 光伏发电系统,微网

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Abstract:

光伏发电系统受气候环境等条件影响,输出功率具有间歇性、随机性等特点;另外,光伏组件、逆变器中的元器件老化等因素使光伏发电系统模型具有不确定性。为保证光伏发电系统柔性并网技术能满足微网电能质量等技术指标要求,针对微网中气候环境变化、元件老化等导致的模型参数摄动对光伏发电系统柔性并网的影响,提出一种基于模型匹配的光伏发电系统柔性并入微网的μ综合鲁棒控制方法,将包含逆变器等实际被控对象在内的模型匹配问题转化为广义系统,并抽象出不确定块,进一步归结为结构化不确定性问题,通过DK迭代得到μ综合控制器。μ分析和仿真结果表明,该μ综合控制器可以较好地保证微网中光伏发电柔性并网系统的标称性能和鲁棒性能,满足快速且无冲击的柔性并网要求,有利于微网的稳定可靠运行。仿真结果验证了所提出的μ综合鲁棒控制方法的可行性和有效性。

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