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Weighted efficiency measurement of PV inverters: introducing ηİZMİR

İLKER ONGUN1,* , ENGIN ÖZDEMIR2

Affiliation

  1. Ege University Ege Meslek Yuksekokulu, 35100 Bornova İzmir, Turkey
  2. Kocaeli University, Faculty of Technology, Department of Energy Systems Engineering, 41380 Umuttepe Kocaeli.

Abstract

Conversion efficiency of DC/AC inverters depends on some parameters and fluctuates over the input power of the inverter. Since the PV inverters operate under a fluctuating input power supplied by the PV modules, conversion efficiency must be measured against the weights of the probable power ranges which represent the various irradiation values. This approach of having different weights for different irradiation ranges resulted in two basic weighted conversion efficiency models of ηEURO and ηCEC. These two models consider the irradiation distribution over the whole annual sunny time and prioritize the ranges with various weight factors. Since the irradiation profiles vary around the planet, inverter efficiencies must be evaluated against local irradiation profiles to get more precise annual energy yield estimation. This paper presents ηİZMİR, a weighted conversion efficiency evaluation model, derived from the İzmir irradiation profile. This model has been developed in a way that it should be simple and accurate so it has been matched with other models for its estimation capabilities. The results are discussed here and suggestions being made..

Keywords

PV inverters, conversion efficiency, weighted efficiency, ηEURO, ηCEC, ηİZMİR.

Submitted at: Dec. 18, 2012
Accepted at: June 12, 2013

Citation

İLKER ONGUN, ENGIN ÖZDEMIR, Weighted efficiency measurement of PV inverters: introducing ηİZMİR, Journal of Optoelectronics and Advanced Materials Vol. 15, Iss. 5-6, pp. 550-554 (2013)