Comparative efficiency of wind turbines with different heights of rotor hubs: performance evaluation for Latvia

Latvian Journal of Physics and Technical Sciences

Zacepins

Komashilovs

2015

The paper is devoted to the investigation into the wind energy potential based on long-term observations of the wind speed and energy density fluctuations at heights from 10 to 160 m on the Baltic Sea coast of Latvia. During the observations (2004 -2013), the wind speed and direction values were measured, and the statistical database was accumulated using a LOGGER 9200 Symphonie measuring systems mounted on 60 m masts -one on the western coast and another on the north-east of Latvia. From June 2011 to May 2012, these measurements were complemented with the data for the heights from 40 to 160 m obtained by means of a ZephIR lidar and with the metrological data provided by "Latvian Environment, Geology and Meteorology Centre" for the same period. The graphs of seasonal fluctuations in the wind speed were obtained for the heights up to 160 m by measurements over the period of 2007 -2013. The results of the research on the wind speed distribution up to 200 m are promising for evaluation of the wind energy potential of Latvia and will be helpful in assessment of prospective sites for construction of WPPs.Keywords: long-term wind measurements; wind speed and energy distribution up to 200 m; ZephIR lidar; LOGGER 9200 Symphonie; wind speed approximating functions.

Section: Estimation Of the Electrical Energy Output By Wind Turbine Bmentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Assessment of Wind Shear and Wind Energy Potential in the Baltic Sea Region of Latvia

Latvian Journal of Physics and Technical Sciences

Zacepins

Komashilovs

2015

“…For adequate comparison of the modelling methods and their further analysis, at determination of expressions for approximating functions (2), (3) and 4, the values corresponding to the three heights (30, 40 and 50 (m)) are used. In these cases, the regularities describing the The modelling of annual energy production using models I Ä V is performed taking the power curve P(V) (kW) of a 2300 kW wind turbine of the E82 type.…”

Section: The Results Of Wind Shear Investigationmentioning

confidence: 99%

“…The proper choice of the model would enable calculation of the annual electricity production (AEP) by generators, making it possible to estimate the efficiency of WT offered for the use of a particular WT type. Figure 1 shows the map of disposition of a laser measuring complex Pentalum SpiDAR in the territory of Latvia on the Baltic Sea coast [3]. The measuring complex is installed in the territory of the Ventspils International Radio-Astronomy Centre at the height of 13.2 (m) above ground level and at a distance of 2.5 (km) from the seashore on a platform with coordinates N 57°33 0 12.00 00 and E 21°51 0 16.00 00 .…”

Section: Introductionmentioning

confidence: 99%

Comparison of different methods for evaluation of wind turbine power production based on wind measurements

Renew. Energy Environ. Sustain.

Zacepins

Komašilovs

2016

Investigations of the wind shear up to the height of 200 (m) on the Latvian coast of the Baltic Sea have been carried out using a Pentalum SpiDAR laser measuring complex. Based on wind speeds measurements for three levels-30, 40 and 50 (m), assessment of the operational efficiency of the wind turbines for heights 100, 140 and 180 (m) have been performed. For comparison, this analysis involves five different approaches: the Rayleigh frequency distribution, three different Weibull frequency distributions and method based on approximation of the cubic wind speed. Results are compared with measurements on the corresponding heights.

“…Wind speed measurement results performed with 1 min increments allow us to calculate the density of wind energy that a wind current in a given region can carry. Based on the information, an estimate of the average annual power production for the projected Wind Power Plants (WPP) can be made [3], [4].…”

Section: Introductionmentioning

confidence: 99%

Modelling the Spatial Distribution of Wind Energy Resources in Latvia

Aniskevich

Latvian Journal of Physics and Technical Sciences

Zandovskis

2017

The paper studies spatial wind energy flow distribution in Latvia based on wind speed measurements carried out at an altitude of 10 m over a period of two years, from 2015 to 2016. The measurements, with 1 min increments, were carried out using certified measuring instruments installed at 22 observation stations of the Latvian National Hydrometeorological and Climatological Service of the Latvian Environment, Geology and Meteorology Centre (LEGMC). The models of the spatial distribution of averaged wind speed and wind energy density were developed using the method of spatial interpolation based on the historical measurement results and presented in the form of colour contour maps with a 1x1 km resolution. The paper also provides the results of wind speed spatial distribution modelling using a climatological reanalysis ERA5 at the altitudes of 10, 54, 100 and 136 m with a 31x31 km resolution. The analysis includes the comparison of actual wind speed measurement results with the outcomes of ERA5 modelling for meteorological observation stations in Ainazi, Daugavpils, Priekuli, Saldus and Ventspils.