Voltage and Reactive Power Control of Front-end Speed Controlled Wind Turbine via H∞ Strategy

Haiying Dong, Shuaibing Li, Lixin Cao, Hongwei Li


According to the characteristics like rapidity, time variability and the uncertainty of the input mechanical torque of the front-end speed control wind turbine (FSCWT) with directly grid-connected electrically excited synchronous generator (EESG), a double-loop Hcontrol approach was proposed. In which, a simpilified structure of brushless excitation system was used. For the inner loop, first Hexcitation controller was designed for realizing a fast excitation control; the second Hpower system stabilizer (PSS) was designed by solving the Riccati equation for the purpose of eliminating the oscillation and desynchronization of generator may caused by fast excitation and improving the system transient stability, which ensured the generator with stable operation in grid-connecting and effectively solved the contradiction between fast excitation and transient stability. Then the designed Hcontrollers were applied to the voltage and reactive power control system (VRCS), which realized the output voltage and reactive power control requriements by tuning the weighting functions. Simulation results show that the double-loop Hcontrol approach was more effective than the single Hexcitation control in voltage and reactive power control of FSCWT.


DOI: http://dx.doi.org/10.11591/telkomnika.v11i8.2423


Voltage and reactive power control, H∞ control, transient stability, front-end speed controlled wind turbine (FSCWT), electrically excited generaor (EESG)

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