分布式电源并网功率的控制研究
摘要：分布式电源(Distributed Generation,DG)并网功率的控制多采用控制并网电流的方式来实现。当电网阻抗变化时,传统比例积分(Proportional-Integral,PI)控制的并网逆变器的系统稳态误差及并网电流总谐波畸变(Total Harmonic Distortion,THD)含量都会增大。基于鲁棒控制理论,本文提出了一种改进型的控制方法,通过合理的设计加权函数,使得在一定的电网阻抗变化范围内,控制系统在基波频率处具有很高的增益,而且具有足够的高频衰减特性。本文分析了电网阻抗变化对传统PI控制的系统稳定性的影响,给出了改进型控制方法的设计原理。仿真及实验结果验证了此改进型控制器的有效性。
Abstract:The power of the distributed generation in the grid-connected mode was usually controlled by the grid current. As the grid impedance changes, the steady-state errors and the content of total harmonic distortion will increase when conventional proportional-integrator controller is used. Based on the robust control technique, an improved control scheme is proposed in this paper. By properly designing the weighting functions, the proposed controller exhibits high gains at the vicinity of the fundamental frequency and the sufficient high-frequency attenuation characteristics within a certain range of the grid impedance changes. In this paper, the influence of the grid-impedance variations on system stability is analyzed when conventional proportional-integrator controller is used, and the design principle of the improved control scheme is given. In the end, the simulation and experimental results verify the effectiveness of the proposed scheme.
标题：分布式电源并网功率的控制研究
英文标题：Research on the Power Control of Grid-connected Distributed Generation Power System
作者：张翔,
关键词：分布式电源, 比例积分控制器, 并网逆变器, 鲁棒控制, 总谐波畸变,
发表日期：2015-10-09
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