This paper presents a fuzzy-logic-based fourth-order generalized integrator (FOGI) frequency locked loop (FLL) based control for optimal operation of solar energy conversion system (SECS) having distribution static compensator (DSTATCOM) capabilities along with supplying active power to the distribution network. The proposed SECS is multifunctional having capabilities of power factor correction, load balancing, and harmonics mitigation in a three-phase distribution system. The FOGI-FLL has higher order filtering capabilities compared to conventional algorithms. The frequency tracking capabilities of proposed control technique exhibit better performance as compared to a conventional algorithm. The comparative performance of harmonics filtering and frequency tracking capabilities is demonstrated between FOGI-FLL and various conventional algorithms. Simulation results demonstrate the behavior of the system at various conditions. To validate the proposed algorithm, a prototype is developed and test results demonstrate the reliable performance of the system at various conditions, such as load unbalancing, variable insolation, solar photovoltaic to DSTATCOM mode at abnormal grid conditions, such as distorted grid voltages, unbalanced grid voltages, voltage sag, and swell. The total harmonics distortions of grid voltages and currents are found well within limit of the IEEE 519 standard.

中文翻译：

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基于模糊逻辑的FOGI-FLL算法用于单阶段三相并网多功能SECS的优化运行

本文提出了一种基于模糊逻辑的四阶广义积分器（FOGI）锁频环（FLL）的控制，用于具有分配静态补偿器（DSTATCOM）功能以及向有功功率供电的太阳能转换系统（SECS）的最佳运行。分销网络。提议的SECS是多功能的，在三相配电系统中具有功率因数校正，负载平衡和谐波抑制的功能。与传统算法相比，FOGI-FLL具有更高阶的滤波功能。与常规算法相比，所提出的控制技术的频率跟踪能力表现出更好的性能。在FOGI-FLL和各种常规算法之间展示了谐波滤波和频率跟踪功能的比较性能。仿真结果证明了该系统在各种条件下的行为。为了验证所提出的算法，开发了一个原型，测试结果证明了该系统在各种条件下的可靠性能，例如负载失衡，日照可变，在异常电网条件下（例如电网电压失真，电网不平衡）到DSTATCOM模式的太阳能光伏发电。电压，电压骤降和膨胀。发现电网电压和电流的总谐波失真在IEEE 519标准的限制之内。在异常的电网条件下，例如畸变的电网电压，不平衡的电网电压，电压骤降和骤升，将太阳能光伏电池转换为DSTATCOM模式。发现电网电压和电流的总谐波失真在IEEE 519标准的限制之内。在异常的电网条件下，例如畸变的电网电压，不平衡的电网电压，电压骤降和骤升，将太阳能光伏电池转换为DSTATCOM模式。发现电网电压和电流的总谐波失真在IEEE 519标准的限制之内。