PROJECT TITLE :

General Constant Power Generation Algorithm for Photovoltaic Systems - 2017

ABSTRACT:

Photovoltaic power plants (PVPPs) typically operate by tracking the most power point (MPP) in order to maximize the conversion efficiency. But, with the continuous increase of installed grid-connected PVPPs, Power System operators have been experiencing new challenges, such as overloading, overvoltages, and operation during grid-voltage disturbances. Consequently, constant power generation (CPG) is imposed by grid codes. An algorithm for the calculation of the photovoltaic panel voltage reference, which generates a continuing power from the PVPP, is introduced during this paper. The key novelty of the proposed algorithm is its applicability for both single- and two-stage PVPPs and flexibility to move the operation purpose to the correct or left side of the MPP. Furthermore, the execution frequency of the algorithm and voltage increments between consecutive operating points are changed based mostly on a hysteresis band controller so as to obtain fast dynamic response beneath transients and low-power oscillation during steady-state operation. The performance of the proposed algorithm for both single- and two-stage PVPPs is examined on a fifty-kVA simulation setup of these topologies. Moreover, experimental results on a one-kVA PV system validate the effectiveness of the proposed algorithm below numerous operating conditions, demonstrating functionalities of the proposed CPG algorithm.