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【24h】Variable Structure Control for Three-Phase LCL-Filtered Inverters Using a Reduced Converter Model

机译使用简化转换器模型的三相LCL滤波逆变器的可变结构控制

【摘要】This paper presents a new concept in active damping techniques using a reduced model of an LCLfiltered grid-connected inverter. The presence of the LCL filter complicates the design of the inverter control scheme, particularly when uncertainties in the system parameters, especially in the grid inductance, are considered. The proposed control algorithm is addressed to overcome such difficulties using a reduced model of the inverter in a state observer. In this proposal, two of the three state variables of the system are obviated from the physical inverter model, and only the inverter-side current is considered. Therefore, the inverter-side current can be estimated emulating the case of an inverter with only one inductor, thus eliminating the resonance problem produced by the LCL filter. Besides, in the case of a distorted grid, the method allows us to estimate the voltages at the point of common coupling free of noise and distortion without using any phase-locked loop based synchronization algorithm. This proposal provides the following features to the closed-loop system: first, robust and simple active damping control under system parameters deviation; second, robustness against grid voltage unbalance and distortion; and third, an important reduction in the computational load of the control algorithm, which allows us to increase the switching frequency. To complete the control scheme, a theoretical stability analysis is developed considering the effect of the observer, the system discretization, and the system parameters deviation. Experimental and comparative evaluation results are presented to validate the effectiveness of the proposed control scheme.

【摘要机译】本文提出了一种使用LCL滤波并网逆变器的简化模型的主动阻尼技术的新概念。 LCL滤波器的存在使逆变器控制方案的设计复杂化,尤其是在考虑系统参数(尤其是电网电感)的不确定性时。解决了所提出的控制算法以在状态观察器中使用逆变器的简化模型来克服这种困难。在该建议中,系统的三个状态变量中的两个已从物理逆变器模型中删除,并且仅考虑了逆变器侧电流。因此,可以模拟仅具有一个电感器的逆变器的情况来估算逆变器侧电流,从而消除了由LCL滤波器产生的谐振问题。此外,在电网畸变的情况下,该方法使我们无需使用任何基于锁相环的同步算法,即可估计无噪声和畸变的公共耦合点的电压。该建议为闭环系统提供以下功能:第一,在系统参数偏差下的鲁棒和简单的主动阻尼控制;第二,对电网电压不平衡和失真的鲁棒性;第三,大大减少了控制算法的计算量,这使我们可以提高开关频率。为了完成控制方案,考虑观察者的影响,系统离散化和系统参数偏差,进行了理论稳定性分析。实验和比较评估结果被提出来验证所提出的控制方案的有效性。

【作者】Ramon Guzman;Luis Garcia de Vicuña;Miguel Castilla;Jaume Miret;Jordi de la Hoz;

【作者单位】;

【年(卷),期】2018(65),1

【年度】2018

【页码】5-15

【总页数】11

【原文格式】PDF

【正文语种】eng

【中图分类】;

【关键词】Impedance;Inverters;Robustness;Damping;Control systems;Mathematical model;Inductance;

机译 阻抗;逆变器;鲁棒性;阻尼;控制系统;数学模型;电感;
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