Vestas

About: Vestas is a company organization based out in Aarhus, Denmark. It is known for research contribution in the topics: Turbine & Wind power. The organization has 1075 authors who have published 1519 publications receiving 23285 citations. The organization is also known as: Vestas Wind Systems & Vestas Wind Systems A/S.

Power plant generation system, method for controlling wind turbine generators, power plant controller and wind turbine generator

Abstract: According to an embodiment, a power generation system is provided comprising a wind power plant comprising a plurality of wind turbine generators and a power plant controller configured to signal, to at least a portion of the plurality of wind turbine generators, a voltage reference for the output voltage of the wind turbine generator wherein each wind turbine generator comprises a controller configured to control the wind turbine generator based on the voltage reference.

A wind turbine blade and method of manufacturing a wind turbine blade

Abstract: A wind turbine blade comprising a lightning protection system is provided. The lightning protection system comprises a lightning conductor located along a longitudinal portion of the wind turbine blade and is coupled to an electrical ground. A lightning receptor module is arranged on an external surface of the wind turbine blade and electrically coupled to the lightning conductor. An elongate receptor band is installed on the external surface of the wind turbine blade, over the lightning receptor module, and the receptor band is arranged to receive a stroke of lightning and transfer electrical current from the lightning stroke to the lightning conductor through the lightning receptor module. Further, the elongate receptor band comprises a crease in a longitudinal cross-sectional profile of the elongate receptor band.A method of installing a lightning protection system on a wind turbine blade is further provided.

Improving Demand Response Potential of a Supermarket Refrigeration System: A Food Temperature Estimation Approach

Abstract: In a smart grid, the load shifting capabilities of demand-side devices such as supermarkets are of high interest. In supermarkets, this potential is represented by the ability to store energy in the thermal mass of refrigerated foodstuff. To harness the full load shifting potential, we propose a method for estimating food temperature based on measurements of evaporator expansion valve opening degree. This method requires no additional hardware or system modeling. We demonstrate the estimation method on a real supermarket display case, and the applicability of knowing food temperature is shown through tests on a full-scale supermarket refrigeration system made available by Danfoss A/S. The conducted application test shows that feedback based on food temperature can increase the demand flexibility during a step by approximately 60% the first 70 min and up to 100% over the first 150 min, thereby strengthening the demand response potential of supermarket refrigeration systems.

A compact viewing configuration for stereoscopic micro-PIV utilizing mm-sized mirrors

Abstract: When applying PIV to micrometer-resolution systems, the out-of-plane velocity component has shown to be much more difficult to obtain than the two in-plane velocity components. In this work, we present a novel stereoscopic viewing configuration for stereoscopic micro-PIV, utilizing mm-sized mirrors introduced in front of the microscope objective lens. Attractive applications, where the advantage of the mirror viewing configuration system could be utilized, include (on-chip) miniaturization and the potential to introduce more than two simultaneous viewing angles. Here, a first validation of our system is presented, including stereoscopic micro-PIV measurements in a micro-fabricated test device.

Control of a multi-rotor wind turbine system using a central controller to calculate local control objectives

Abstract: The present invention relates to control of a wind turbine system comprising a plurality of wind turbine modules mounted to a common support structure, i.e. to control of a multi-rotor wind turbine system. The invention discloses a control system for a multi-rotor wind turbine system which comprises local controllers operable to control the wind turbine modules in accordance with local control objectives and a central controller configured to monitor the operation of the wind turbine system and based thereon calculate the local control objectives. The central controller is implemented as a model predictive controller (MPC).