Abstract
With the gradual increase of wind power penetration in the power system, the impact of wind farm on system stability is becoming more significant. This study designs the power system stabilizer (PSS) based on the model reference adaptive control (MRAC) method and virtual impedance (VI) control strategy. Then, the active power difference of the doubly fed induction generator (DFIG) is selected as input signal of MRAC-PSS-VI. The small-signal stability of the power system with the DFIG is enhanced by installing MRAC-PSS-VI on the rotor side control (RSC) control link. The controller model is built in DigSILENT/PowerFactory. The improvement effect of the controller on the low-frequency oscillation (LFO) characteristics of the power system is verified by using eigenvalue analysis and the time domain simulation method under different transmission powers of the tie line and different installed positions of the DFIG.
Highlights
While wind power is used as potential source of electricity, the development of wind energy is increasing rapidly around the world
International Transactions on Electrical Energy Systems consisting of wide area centralized and local controls of power oscillation damper (POD) installed with the doubly fed induction generator (DFIG) wind power turbine, and the power system stabilizer (PSS) has been proposed for robust power oscillation damping
G1–G4 are four thermal power generator units whose rated capacity is 900 MVA and rated voltage is 20 kV. e node 3 of the system is the reference node, and the active power output of each generator is 700 MW. e wind farm node is on the area 2 bus 10 (Figure 10). e DFIG was connected to the system via bus 10, and the wind power output is 5 MW
Summary
While wind power is used as potential source of electricity, the development of wind energy is increasing rapidly around the world. International Transactions on Electrical Energy Systems consisting of wide area centralized and local controls of POD installed with the DFIG wind power turbine, and the PSS has been proposed for robust power oscillation damping. All these control schemes do not take the output impedance of the PSS into account. (a) e PSS controller is improved based on the VI control method (b) MRAC method is used to optimize the control of the designed PSS-VI (c) e reference model of MRAC is designed by the TLS-ESPRIT method and regional pole assignment method (d) Eigenvalue analysis method and time domain simulations method are employed to estimate the effects of heightening the stability after MRAC-PSS-VI is installed in the DFIG is study is structured as follows. The effectiveness of the designed controller is verified by using the eigenvalue analysis method and time domain simulation method through a four-machine system, and some conclusions are given at the end of the study
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