The perturb & observe (P&O) algorithm is very popular for maximum power point tracking (MPPT) for solar photovoltaic (PV) systems. However, it has tracking problems during varying irradiations as well as the nuisance of oscillations around the maximum power point (MPP). This work introduces a circle center-line concept based P&O (CCCP&O) algorithm for MPPT, where, the concept of circle and its center are combined with the P&O algorithm. This algorithm tends to reduce the number of iterations taken to reach the MPP, which reduces settling time. Moreover, the problem of large oscillations around the MPP is eliminated by using the concept of flexible step size. The algorithm initializes with standard P&O, but utilizes a approach of diameter equivalence of a circle as a procedure to reach next operating point on the power-voltage plot. Therefore, the iterations required to get to the MPP are reduced substantially. The MPP changes with change in solar irradiance, therefore, a concept of artificial envelope around the P-V curve is used to improve tracking of the algorithm during varying irradiances. The overall performance of the algorithm is demonstrated and compared in simulation using SIMULINK MATLAB as well as also shown experimentally in a developed hardware prototype.

中文翻译：

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一种基于快速圆中心线概念的太阳能光伏能量转换系统MPPT算法

扰动和观察 (P&O) 算法在太阳能光伏 (PV) 系统的最大功率点跟踪 (MPPT) 中非常流行。然而，它在不同辐照期间存在跟踪问题以及最大功率点 (MPP) 附近振荡的滋扰。这项工作介绍了一种基于圆中心线概念的 P&O（CCCP&O）算法用于 MPPT，其中圆及其中心的概念与 P&O 算法相结合。该算法倾向于减少达到 MPP 所需的迭代次数，从而减少稳定时间。此外，通过使用灵活步长的概念，消除了 MPP 周围大振荡的问题。该算法使用标准 P&O 进行初始化，但是使用圆的直径等效方法作为到达电源电压图上的下一个工作点的程序。因此，达到 MPP 所需的迭代次数大大减少。MPP随着太阳辐照度的变化而变化，因此，在PV曲线周围使用人工包络的概念来改进在变化辐照度期间算法的跟踪。该算法的整体性能在使用 SIMULINK MATLAB 的仿真中进行了演示和比较，也在开发的硬件原型中进行了实验显示。