Power Smoothing Control Strategy Of Direct Driven Permanent Magnet Synchronous Wind Power Generation System Based On TSMC

At present, the direct-driven permanent magnet synchronous wind powergenerator system in the domestic wind power market share higher and higher, andgradually replace the double-fed wind power generation system become themainstream models of wind power. The rotor of generator is directly driven by windturbine.Due to the default of the intermediate gear box, the system size and theamount of maintenance is reduced, and the stability and reliability of the system isincreased.As a novel power conversion device, TSMC is characteristic of the controldegrees of freedom, adjustable input power factor, power can flow in both directions.Without the energy storage component of the DC side, TSMC is not only compact,small size, high efficiency, and facilitate the achievement of integrated control.Therefore, TSMC as a full power converter of direct drive permanent magnetsynchronous wind power generation system has great application potential.Due to wind speed fluctuations with unpredictable and random features, theactive power generated by wind turbines will fluctuated, and in severe cases may havea greater impact on power quality, cause the grid frequency fluctuations, and evencause the problem of stability of the grid. Therefore, in order to improve thereliability of wind turbines interconnected to power grid and improve thepower quality, better smoothness of active power generated by wind turbines isrequired. A study on active power smoothing control technology applied in directdrive permanent magnet synchronous wind power system based on TSMC isimplemented in this paper. Begins with a brief analysis of operating principle anddual-space vector modulation strategy of TSMC, an inverter-grid mathematical modelof TSMC is established in dq-axis, an inverter stage power integrated control strategyof the system is explained. Secondly, according to the contradiction between powersmoothness and wind energy utilization under the existed power smooth control, apower smoothing control strategy applied in TSMC direct-drive wind power system isproposed. Fuzzy control has been used in the new algorithm to improve thecalculation algorithm of the reference power in traditional EMA algorithm, so that thenumber of periods can be adjusted timely according to the wind conditions. When thewind speed changes quickly a more smooth power curve will be obtained, and whenthe wind speed changes slowly a better maximum power can be tracked. So the smoothness of the system and the requirements of wind energy utilization are bothtake into consideration. A detailed analysis of the design method of fuzzy logiccontroller and the process to achieve the algorithm of smooth power reference valuebased on fuzzy logic control under Matlab is implemented. Finally, a systemsimulation model is build under the Matlab/Simulink environment, and thecorrectness and validity of the proposed control strategy are verified.