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| Stability and Control of Shaft Torsional Oscillation for Doubly-Fed Wind Power Generator |
| Zhang Chen1, 2, Li Zheng1, Cai Xu1, 2, Gao Qiang1, 2, Wang Ningbo3 |
1. Wind Power Research Center of Shanghai Jiao Tong University Shanghai 200240 China;
2. School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University Shanghai 200240 China;
3. Wind Power Technology Center of Gansu Electric Corp Lanzhou 730050 China |
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Abstract When focused on learning dynamic interaction between doubly-fed wind turbine and the grid, the equivalent two-mass shaft model of doubly-fed wind turbine was sufficient. Under external disturbance, shaft dynamic is characterized as torsional oscillation and reflected in the output power, the oscillation frequency is close to the power system oscillation, and might have an impact on power angle stability; Moreover, shaft oscillation will also affect the stability and lifespan of the doubly-fed wind turbine itself. Using small signal analysis methods, electrical damping characteristics of the active control loop is firstly analyzed, negative electrical damping characteristics of the doubly-fed wind turbine under the maximum power point tracking control is provided, and it’s not conducive to shaft stability. Subsequently a shaft stabilizer is proposed, contains electrical damping and electrical stiffness two control loops, increasing electrical damping can effectively suppress the shaft torsional oscillation, which is beneficial to the stability of the doubly-fed wind turbine and power system; increasing electrical stiffness is equivalent to strengthen shaft coupling, to inhibit speed oscillation amplitude, which is favorable to the lifespan of doubly-fed wind turbine.
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Received: 24 May 2013
Published: 29 June 2015
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2015, Vol. 30 
