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A Fuzzy Logic Controller for Autonomous Operation of a Voltage Source Converter-Based Distributed Generation System

机译：基于电压源变换器的分布式发电系统自主运行的模糊逻辑控制器

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摘要

This paper presents a fuzzy logic controller (FLC) for autonomous (islanded) operation of an electronically interfaced distributed generation unit and its load. In the grid-connected mode, the voltage-sourced converter is operated in the active and reactive power (PQ) control mode, where a conventional control scheme is used to control the active and reactive power exchange with the grid. In the islanded mode, the proposed FLC is used to control the voltage of the islanded system despite the load variability and uncertainties. In addition, this paper also presents the use of the black-box nonlinear optimization technique to tune the parameters of the membership functions of the FLC in order to achieve optimal performance. The salient features of the proposed FLC are: 1) efficient to deal with the nonlinear systems; 2) design does not depend on the mathematical model of the system; and 3) less sensitive to the parameters variation than the conventional controllers. The frequency of the islanded system is dictated through the use of an internal oscillator. The effectiveness of the proposed FLC in controlling the voltage of the islanded system, irrespective of the load variability, is extensively validated based on simulation studies in the PSCAD/EMTDC environment. Moreover, the paper highlights the superiority of the proposed FLC over the conventional proportional-integral controllers through comparing the transient responses of the system based on both controllers.
机译：本文提出了一种模糊逻辑控制器（FLC），用于电子接口分布式发电单元及其负载的自主（孤岛）运行。在并网模式下，电压源转换器在有功和无功功率（PQ）控制模式下运行，在该模式下，常规控制方案用于控制与电网的有功和无功功率交换。在孤岛模式下，尽管负载具有可变性和不确定性，但建议的FLC用于控制孤岛系统的电压。此外，本文还介绍了使用黑盒非线性优化技术来调整FLC隶属函数的参数，以实现最佳性能。所提出的FLC的显着特征是：1）有效地处理非线性系统； 2）设计不依赖于系统的数学模型； 3）对参数变化的敏感性不如常规控制器。孤岛系统的频率由内部振荡器决定。基于PSCAD / EMTDC环境中的仿真研究，所提出的FLC在控制孤岛系统电压方面的有效性（与负载可变性无关）已得到广泛验证。此外，本文通过比较基于两个控制器的系统的瞬态响应，突出了所提出的FLC优于常规比例积分控制器的优势。

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