Abstract
In this paper, a detailed model and an average model of an MMC (Modular Multilevel Converter)-controlled Permanent Magnet Synchronous Generator (PMSG)-based direct drive wind turbine are proposed. The models are used to analyze the steady-state and transient characteristics of the grid connectivity study of the wind turbine generator. Configuration of the electrical topology and the control scheme of the wind turbine generator for both models are comprehensively presented. In the detailed model, the MMC circuit is represented by power electronic IGBTs, with switching phenomena considered. Meanwhile, in the average model, the MMC circuit is simplified by using voltage source representation, hence the complexity of the MMC circuit and the simulation duration of the analysis can be reduced. Comparative analysis between the detailed and the simplified models is also investigated through simulation performed using PSCAD/EMTDC. The simulation results show that both models have a good controllability and dynamic stability under steady-state and transient conditions. The simulation results also confirm that the average model has adequate accuracy, and simulation time can be reduced significantly.
Highlights
In recent years, wind turbine generators have been significantly increasing in size, in terms of hub height, rotor diameter, and generator capacity, in order to convert more power from wind energy with higher efficiency and lower investment and operating costs
The majority of reports have investigated the stability of grid-connected wind farms using Modular Multilevel Converter (MMC)-based High Voltage Direct Current (HVDC) transmission systems [6,7,8,9,10], but only a few papers have discussed the topology concept of the implementation of MMC-controlled wind turbine generators
On the stator-side MMC, IS(abc) and VS(abc) are, respectively, three-phase currents and voltages from the stator winding, and ωr is the rotational speed of the rotor shaft of the Permanent Magnet Synchronous Generator (PMSG)
Summary
Wind turbine generators have been significantly increasing in size, in terms of hub height, rotor diameter, and generator capacity, in order to convert more power from wind energy with higher efficiency and lower investment and operating costs. The majority of reports have investigated the stability of grid-connected wind farms using MMC-based High Voltage Direct Current (HVDC) transmission systems [6,7,8,9,10], but only a few papers have discussed the topology concept of the implementation of MMC-controlled wind turbine generators. In this paper, detailed and average models of grid-connected MMC-controlled Permanent Magnet Synchronous Generator (PMSG)-based direct drive wind turbines are proposed. The organization of the paper can be summarized as follows: Section 2 presents the proposed detailed model of the MMC-controlled PMSG-based wind turbine.
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