Smart optimal control of DC-DC boost converter for intelligent PV systems

M. Elshaer, A. Mohamed, O. Mohammed
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引用次数: 7

Abstract

This paper presents a novel smart-PID controller for optimal control of DC-DC boost converter used as voltage controller in PV systems. This proposed controller maximizes the stable operating range by using genetic algorithms (GA) to tune the PID parameters ultimately at various loading conditions. Then, a fuzzy logic approach is used to add a factor of intelligence to the controller such that it can move among different values of proportional gain, derivative gain and integral gain based on the system conditions. This controller allows optimal control of boost converter at any loading condition with no need to retune parameters or possibility of failure. Moreover, the paper presents a novel technique to move between the PI and PID configurations of the controller such that the minimum overshoot and ripple are obtained, which increases the controller applicability for utilization of PV systems in supplying sensitive loads. The controlled boost converter is used as an interface between photovoltaic (PV) panels and the loads connected to them. It converts any input voltage within its operating range into a constant output voltage that is suitable for load feeding. The proposed smart controller adapts the duty cycle of the boost converter based on input voltage and loading conditions such that it outputs a constant output voltage. A prototype system has been developed in the laboratory to verify the applicability of the proposed controller. Moreover, simulation and experimental results both confirm its validity of the proposed controller as an effective and reliable controller for boost converters in PV systems and the possibility to use it in practical situations.
智能光伏系统DC-DC升压变换器的智能最优控制
本文提出了一种新颖的智能pid控制器,用于光伏系统电压控制器DC-DC升压变换器的最优控制。该控制器采用遗传算法对不同负载条件下的PID参数进行自整定,从而实现稳定运行范围的最大化。然后,采用模糊逻辑方法在控制器中加入智能因子,使其能够根据系统条件在比例增益、导数增益和积分增益的不同值之间移动。该控制器允许在任何负载条件下对升压转换器进行最优控制,无需重新调整参数或故障的可能性。此外,本文还提出了一种新颖的技术,可以在控制器的PI和PID配置之间切换,从而获得最小的超调量和纹波,从而增加了控制器在光伏系统提供敏感负载时的适用性。可控升压变换器用作光伏(PV)板和与其相连的负载之间的接口。它将其工作范围内的任何输入电压转换成适合负载馈电的恒定输出电压。所提出的智能控制器根据输入电压和负载条件调整升压变换器的占空比,使其输出恒定的输出电压。在实验室中开发了一个原型系统来验证所提出的控制器的适用性。仿真和实验结果均证实了该控制器作为光伏系统升压变流器有效可靠的控制器的有效性,以及在实际应用中的可行性。
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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