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

发布时间：2018-11-19 20:25

【摘要】：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。
[Abstract]:Photovoltaic power generation system is affected by climate and environment, and the output power is intermittent and random. In addition, the aging of photovoltaic components and inverters makes the model of photovoltaic power system uncertain. In order to ensure that the flexible grid-connected technology of photovoltaic power system can meet the technical requirements such as micro-grid power quality, the influence of model parameter perturbation on the flexible grid-connected photovoltaic power system caused by climate and environmental changes in the micro-grid and aging of elements is discussed. A 渭 synthesis robust control method based on model matching is proposed for flexible integration of photovoltaic power generation system into microgrid. The model matching problem, which includes actual controlled objects such as inverter, is transformed into a generalized system, and uncertain blocks are abstracted. It is further reduced to structured uncertainty problem. 渭 synthesis controller is obtained by DK iteration. 渭 analysis and simulation results show that, The 渭 integrated controller can guarantee the nominal performance and robust performance of the flexible grid-connected photovoltaic system in microgrid, meet the requirements of fast and non-impact flexible grid-connected system, and is conducive to the stable and reliable operation of the micro-grid. Simulation results demonstrate the feasibility and effectiveness of the proposed 渭-synthesis robust control method.
【作者单位】：新能源电力系统国家重点实验室(华北电力大学);
【基金】：国家自然科学基金项目(50977029) 河北省自然科学基金项目(E2013502074)~~
【分类号】：TM464;TM615

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