بررسی رفتار شبکه سه فاز متصل به سیستم فتوولتائیک برای کنترل توان اکتیو و راکتیو توسط روش DPC

بررسی رفتار شبکه سه فاز

بررسی رفتار شبکه سه فاز

حجم فایل: ۶۲۷kb

تعداد صفحه: ۱۰ صفحه

فرمت فایل : pdf

قیمت فایل : رایگان

بررسی رفتار شبکه سه فاز

Investigation of the behavior of a three phase gridconnected photovoltaic system to control active and reactive power with DPC

Abstract

This paper proposes an extended direct power control (DPC) for a three-phase PWM multilevel inverter fed by photovoltaic generation system (PVGS) and connected of a grid. The model contains a detailed representation of the main components of the system that are the solar array, and the grid side inverter multilevel inverter NPC VSI. In order to extract the maximum amount of from the photovoltaic generator, we propose an intelligent control method (fuzzy logic controller) for the maximum power point tracking (MPPT) of a PVGS. The DPC approach for multilevel inverter NPC which makes it possible to achieve unity power factor (UPF) operation by directly controlling its
instantaneous active and reactive power.

The other is a fuzzy logic controller, in the multi-DC-bus voltage control loop, developed to provide active power command. To achieve UPF operation, the reactive power command is set to zero. It is shown via simulation results that the proposed DPC has high performance. Moreover, the controller multi DC bus link voltages based on fuzzy logic has excellent performance in transient and steady states, a good robustness, a good dynamic behaviour response, and a good rejection of impact of load disturbance.

Keyword:

Direct power control, Fuzzy logic control, MPPT, Photovoltaic, Multilevel inverter NPC, multi DC bus voltage.

۱٫ Introduction

In recent years, the efforts to spread the use of renewable energy resources instead of pollutant fossil
fuels and other forms have increased.
PVGS are increasing in size as they become more affordable and supporting schemes start to include
larger installations. In a near future, PVGS are going to be very common, and it is expected that they will contribute with a significant share to power generation.
One of the most common control strategies structures applied to decentralized power generator is
based on Power direct control employing a controller for the multi DC link voltage and a controller to
regulate the injected current to the utility network.