Electrical design and control. A simulation platform to modelling, optimisation and design of wind turbines
The main goals of the simulation platform can be summarized as follows: 1) To extend the ability of the existing wind turbine design tools to simulate the dynamic behavior of the wind turbines and the wind turbine grid interaction, in continuous, discontinuous and fault situations. 2) To extend the existing wind turbine aero elastic design tools (e.g. HAWC and FLEX 4/5) with more detailed models for the electrical part of the wind turbine, to that extent that it makes sense.
Electrical design and control of wind turbines becomes more and more important. New control principles are appearing with improved control capabilities which reduce the strees on the turbine and they give also added value. One possibility is using frequency converters which give variable speed. It demands advanced power electronics and it has to be taken into account during the design of a wind turbine. In previous design the main focus was on the mechanical parts of the turbine but now it is necessary and important to include the electrical part and use the possibility to improve the adoption of the turbines in the power system. This project is initiated to strengthen the modelling and simulation tools for wind turbines with special focus on the electrical part and its interaction with the mechanical part of the wind turbine as well as the grid. The goal is to develop a simulation platform for simulation of the electrical part of the turbine which may also be used to simulate the mechanical and aero dynamical conditions, e.g. modelled by simulation tools like HAWC and Flex 4. The models will be used at different levels dependent on the situation to be simulated. The models should also be used in the optimisation of a complete wind turbine
For example, HAWC can be extended with reduced order models for the electrical generators and steady state models for power converters, transformers, grid, etc 3) To develop dynamic and steady state models for all components within a wind turbine, which in a longer term can be used in a complete optimization of a wind turbine system: models for mechanical part (wind, drive train, active and passive stall wind turbine, variable pitch wind turbine), models for generators (squirrel-cage, doubly-fed induction generator, synchronous generator, permanent magnet synchronous generator), models for power converters (soft-starter, back-to-back voltage source converter, multi-level converter, matrix converter), models for three-phase transformers (two-winding, three-winding), models for cables and distribution lines, grid models, etc. The attention in the simulation platform project is drawn to the four different simulation tools: HAWC, DIgSILENT, Saber and Matlab/Simulink. The abilities of these simulation tools are complementary and they can together cover all the modelling aspects of the wind turbines, such as mechanical loads, power quality, switching, control and grid faults. The main results are: 4) A new induction generator model has been implemented in HAWC. This model improves the ability of the aero elastic program to predict the interaction between the mechanical part and the electrical one in a wind turbine. A strong feature of it is also that it can be used to simulate the response of both squirrel cage induction generators and doubly-fed induction generators. A very interesting result of the implementation of the new induction generator model in HAWC is a critical coupling between the turbine modes and the generator mode. 5) The program DIgSILENT has been extended and further developed for wind power applications, based on extensive communication and collaboration between DIgSILENT and Risø. 6) Two wind turbine concepts have been implemented in DIgSILENT during the project: active-stall fixed-speed wind turbine concept with squirrel cage induction generator and variable-speed, variable-pitch wind turbine concept with doubly-fed induction generator. These wind turbine concept models can be used or even extended for the study of different aspects, e.g. assessment of power quality, control strategies, connection of the wind turbines at different types of grid. New control methods have been developed and implemented. 7) The basic components of the wind turbine systems have been implemented and collected in a Saber Toolbox for wind turbine applications. 8) Now a dedicated Matlab/Simulink Toolbox for wind turbine applications is available. The components for all four main concepts used in wind turbine systems are modelled and collected in this Matlab/Simulink Toolbox. New models, which usually are not available in the simulation tools have been developed, tested and implemented in other tools e.g. HAWC, Saber, etc.
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Participants
| Partner | Subsidy | Auto financing |
|---|---|---|
| Danmarks Tekniske Universitet (DTU) |
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