Comparative study between measured and estimated wind energy yield

Abstract

This paper proposes a power-speed (P-V) model of the wind turbine by assuming three different functions for the first performance region; cubic, quadratic and uncorrected cubic. These three functions have been compared with the manufacturer models of five different wind turbines which were installed in five different locations in Jordan; Tafila, Hofa, Fujeij, Al Rajef, and Deahan. The wind turbine of these wind farms are considered as large scale HAWT in the range of Mw. The generated P-V models are developed by applying a new method described in this paper which is basically based on generating a multiplier factor x. In this study, the quadratic model shows the highest correlation compared with the other models. The wind energy yield for the selected wind farms has been estimated by a mathematical modelling based on Rayleigh distribution function, derived in this paper. The energy yield using this mathematical model has been compared with the measured energy output of four wind farms, Tafila, Hofa, Al Rajef, and Deahan. The measured energy were provided by the operators of these wind farms which are: Jordan Wind Project Company(JWPC), Central Electricity Generation Company (CEGC), Green Watts Renewable Energy (GWRC)and Korean Southern Power Company(KOSPO). Results show that the estimated energy using the quadratic wind turbine model for all wind farms are very close to the actual output. Accuracy analysis for the quadratic model resulted in an error of less than 10 % between the measured and estimated energy output for all wind farms. The capacity factors for the selected wind farms have been estimated using the quadratic P-V model. Results show that Tafila wind farm has the highest capacity factor which is around 47 % .

Intelligent Optimized Wind Turbine Cost Analysis for Different Wind Sites in Jordan

“…Wind farms that were operational in 2017 produced 132 MW of energy. Wind farms with a capacity of 155 MW are now being built and will be connected to the grid soon [43]. The rest of the paper is organized as follows: Section 2 describes the evolution of wind energy in Jordan; the energy extracted from wind turbines is presented in Section 3; cost analysis of the designed systems is presented in sections 4 and 5; the optimization problem is defined in Section 6; extrapolation method of wind speed is illustrated in Section 7; results and discussion are presented in Section 8; real measurements and the validation process are discussed in Section 9; and conclusions are presented in Section 10.…”

“…Such models are simple and easy to evaluate; however, they are free of detailed economic parameters and have a low accuracy level. Therefore, several research studies have used detailed economic models that are intrinsically about the time value of money [36][37][38][39][40][41][42][43][44][45][46][47][48]. Nevertheless, these models assume that the capital cost is constant for different energy production.…”

Modelling, Design and Control of a Standalone Hybrid PV-Wind Micro-Grid System

“…It can be observed from Figure 5 that λ needs to be maintained at an optimal value for all wind speeds-to run the WECS with maximum C p value [34][35][36][37][38][39][40]. This can be done only using variable speed operation with DFIG or PMSG where the rotor speed of the turbine can be adjusted at variable wind speed [9,[41][42][43][44][45]. Pitch angle control is usually used in large scale wind systems to fix the output power of the wind turbines at a specific limit, especially at high wind speed [28,46].…”

Power curve modelling of wind turbines‐ A comparison study

“…In the literature, each category is characterized by several mathematical models. Table 1 shows a summary for the suggested mathematical models, used to represent q(v) [23][24][25][26][27][28][31][32][33][34]. As seen from this table, they are mainly divided into three main categories: polynomial power curves, exponential power curves and ratio power curves.…”

“…By analysing the technical data of the commercial database, it can be concluded that the typical values for cut-in wind speeds are lower than 5 m/s (V I < 5 m/s), for rated wind speeds are between 10 and 17 m/s (10 < V R < 17 m/s) and 1 A summary for the suggested mathematical models, used to represent q(v) [11,[23][24][25][26][27][28] q(v)…”