UDE Based Robust Control of Grid Tied Inverters

Akın Uslu
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引用次数: 1

Abstract

In this paper, a modified (proportional-integral) PI control is suggested to improve current tracking performance of three-phase grid-tied inverters (GTI). Presence of the L filter between inverter and grid, makes complex to design a controller with proper parameters, due to characteristics of the filter. Clasical PI control depends on an accurate dynamical model, thus its performance is deteriorated by parametric uncertainties, unmodelled dynamics and external disturbances, when operating conditions affect the filter parameters. To solve this problem, uncertainty and disturbance estimator based PI current control approach is proposed for grid-tied inverters, which provides robustness against to parametric perturbations. An UDE based observer that has been adopted into the PI current loop is used to eliminate lumped disturbances and the steady-state tracking error of current states, which can enhance the robustness of the control performance. Then, parameter design method, stability and robustness analysis are explored and presented. Performance comparison among the clasical PI and proposed control scheme. Efficacy and performance of the proposed approach are carried out by simulations and experiments. Experimental results show that effectiveness of the suggested control method against parametric uncertainties and disturbances are succesfully validated. Besides, the precise current tracking performance with zero steady state error has been reached.
基于UDE的并网逆变器鲁棒控制
本文提出了一种改进的(比例积分)PI控制方法来改善三相并网逆变器的电流跟踪性能。逆变器与电网之间存在L滤波器,由于滤波器的特性,使控制器的参数设计变得复杂。经典的PI控制依赖于精确的动态模型,因此当操作条件影响滤波器参数时,其性能会受到参数不确定性、未建模动力学和外部干扰的影响。为了解决这一问题,提出了一种基于不确定性和扰动估计的并网逆变器PI电流控制方法,该方法对参数扰动具有鲁棒性。在PI电流环中引入基于UDE的观测器,消除了集总扰动和电流状态的稳态跟踪误差,增强了控制性能的鲁棒性。然后,对参数设计方法、稳定性和鲁棒性分析进行了探讨。经典PI与所提控制方案的性能比较。通过仿真和实验验证了该方法的有效性和性能。实验结果验证了所提控制方法对参数不确定性和干扰的有效性。并且达到了零稳态误差的精确电流跟踪性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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