Abstract
This paper proposes a novel optimal current given (OCG) maximum power point tracking (MPPT) control strategy based on the theory of power feedback and hill climb searching (HCS) for a permanent magnet direct drive wind energy conversion system (WECS). The presented strategy not only has the advantages of not needing the wind speed and wind turbine characteristics of the traditional HCS method, but it also improves the stability and accuracy of MPPT by estimating the exact loss torque. The OCG MPPT control strategy is first carried out by simulation, then an experimental platform based on the dSPACE1103 controller is built and a 5.5 kW permanent magnet synchronous generator (PMSG) is tested. Furthermore, the proposed method is compared experimentally with the traditional optimum tip speed ratio (TSR) MPPT control. The experiments verify the effectiveness of the proposed OCG MPPT strategy and demonstrate its better performance than the traditional TSR MPPT control.
Highlights
Renewable energy resources, especially wind energy, are attracting great attention with the depletion of existing fossil fuel deposits and increasing concerns about CO2 emissions
This paper proposed a novel optimum current given maximum power point tracking (MPPT) control method for a permanent magnet direct drive wind energy conversion system
The given optimum power which is changed due to the change of the losses varying with the generator speed which will reduce the effectiveness of the MPPT control
Summary
Especially wind energy, are attracting great attention with the depletion of existing fossil fuel deposits and increasing concerns about CO2 emissions. The maximum power can be estimated through a Takagi-Sugeno-Kang (TSK) fuzzy controller by measuring the rotor speed and power generated by the generator without measuring wind speed and wind turbine parameters. To overcome these drawbacks of the traditional HCS and power feedback MPPT methods, some effective measures are taken in this paper. Its objective is to present an effective optimum current given (OCG) MPPT method combining the advantages of the power feedback method and the HCS method without knowing the wind speed and turbine characteristics. The proposed method can extract the maximum power point more exactly and steadily than traditional HCS control, especially when the wind speed changes quickly. The experimental results demonstrate the feasibility and effectiveness of the proposed strategy
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