Grid integration & Wind farm management

ENERCON annular generator and grid management system

Today, global energy supply without wind energy would be difficult to imagine. Given the ongoing rise in electricity demand, it is more than ever our responsibility to guarantee secure power supply. Wind energy has come of age and in the years ahead the development of wind energy will play a major role in the race to satisfy demand. To accomplish this, one of the vital factors will be the capability of wind technology to be integrated into existing power systems. Stringent regulations imposed by grid operators require wind turbines and wind farms to fulfil power plant properties which necessitate highly sophisticated and flexible technology. The new version of the German Renewable Energy Sources Act has put the necessary framework in place for this. In cooperation with German and international utilities, ENERCON has already made major advancements in developing practical grid connection solutions for our wind turbines and wind farms to offer the desired and legal system services to the grid. Also in the future, ENERCON will continue to set the benchmark in the field of integrating wind turbines in electrical grids, guaranteeing a stable, profitable and highly qualitative supply of wind energy.

Amongst other features, the annular generator is a key component in ENERCON’s gearless wind generator design. This low-speed synchronous generator is directly connected to the rotor. Generator output voltage and frequency vary with the speed and are converted via the ENERCON Grid Management System to be fed into the grid.This allows rotational speed control to be optimised; the annular generator is thus perfectly independent of the grid. By adjusting or ‘pitching’ the blades and through electrical excitation via the turbine control system, rotational speed and power output are constantly checked and optimised. The electrical power produced by the annular generator passes into the ENERCON Grid Management System which comprises a rectifier, the so-called DC Link and a modular inverter system. The inverter system defines the essential performance characteristics for output to the grid and ensures that the power output corresponds to grid specifications. Here in the inverter system, voltage, frequency and power are converted accordingly. Via the transformer, inverter voltage (400 V) is stepped up to the appropriate medium voltage required by the grid or the wind farm network.

ENERCON wind turbines are equipped with a Grid Management System designed to meet the latest grid connection requirements. This facilitates integration in any transmission and distribution network. The Grid Management System offers numerous performance features e. g. reactive power management and optimum contribution to maintaining voltage levels. Essentially, ENERCON wind farms behave very much like power stations or in some aspects even exceed their performance. ENERCON is the first manufacturer worldwide to have received certification confirming these power plant properties. These product and unit certificates as well as validated simulation models will in future be used as a basis for the wind farm certificates required by the German Association of Energy and Water Industries guidelines and the latest Renewable Energy Sources Act.