Abstract
New locations for onshore technology, which have not been considered so far, must be developed to increase the total installed capacity of renewable energies, especially wind energy. For this purpose, cost-effective wind turbines, even in difficult-to-access locations, such as mountainous and high-mountainous areas, must be designed. This paper presents a novel wind turbine with a related control system that meets these requirements. The proposed turbine uses a multi-rotor configuration with five rotors arranged in a star shape configuration. Each rotor drive train combines up to 12 generators in a maintenance-friendly multi-generator concept. A suitable observer-based control for load mitigation in the full-load region is proposed for the multi-rotor and multi-generator design. Simulations are used to demonstrate the applicability and practical benefits of this concept.
Highlights
The proposed control system for multi-rotor wind turbines consists of an observerbased nonlinear controller with state feedback
The control law in a parallel distributed compensation (PDC) scheme consists of a state and integral error feedback: Nr
Note that the v(t)-curve describes the entire homogeneous wind field in the rotor plane, which means that the wind speed is constant over the whole rotor area
Summary
Achieving the ambitious goal of reducing CO2 production, the share of renewable energy sources in power generation must be significantly increased in all countries worldwide. The need to reduce energy costs means that wind turbines should produce more power per turbine, which leads to very high loads on single-rotor wind turbines because the rotor blades must be suitably long For this reason, new research and development activities have been taking place since the beginning of the millennium. Another essential aspect mentioned before is the model-based automatic control concept for mechanical load mitigation of multi-rotor turbines. Comparison of the electrical topology (generator–converter interconnection) of multi-rotor wind turbines was presented in [12] In this regard, eight electrical topologies were proposed and analyzed in terms of mass, cost efficiency, number of components and reliability.
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