Modeling of a central heating electric boiler integrated with a stand-alone wind generator

Abstract

This paper proposes a model of a central heating electric boiler integrated with a stand-alone wind generator. The paper also investigates control schemes for the wind turbine generator and the electric boiler. For the wind turbine generator, the two control schemes are proposed for control of the pitch angle and generator rotor speed respectively. The pitch angle control uses the generator output power as the input signal to ensure normal operation in high wind speed. The speed control is realized by adjusting the resistive load to trace the maximum output power. For the boiler, the temperature control is used to regulate the outlet water temperature by changing the electric power obtained from the power grid. In order to verify the proposed model and control schemes, simulation studies have been conducted using MATLAB/Simulink. Simulation results demonstrate that the wind turbine generator can trace the maximum power in the low and medium wind speeds and operate at the rated output in the high wind speeds, with the help of the proposed control schemes. It is also proved that the outlet water temperature of the boiler can be regulated by its temperature controller according to a set point.