Title :
Dynamic Stability Improvement of an Integrated Grid-Connected Offshore Wind Farm and Marine-Current Farm Using a STATCOM
Author :
Wang, Li ; Hsiung, Chia-Tien
Author_Institution :
Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan
fDate :
5/1/2011 12:00:00 AM
Abstract :
This paper presents a control scheme based on a static synchronous compensator (STATCOM) to achieve both voltage control and damping enhancement of a grid-connected integrated 80-MW offshore wind farm (OWF) and 40-MW marine-current farm (MCF). The performance of the studied OWF is simulated by an equivalent doubly-fed induction generator (DFIG) driven by an equivalent wind turbine (WT) while an equivalent squirrel-cage rotor induction generator (SCIG) driven by an equivalent marine-current turbine (MCT) is employed to simulate the characteristics of the MCF. A damping controller of the STATCOM is designed by using modal control theory to contribute effective damping characteristics to the studied system under different operating conditions. A frequency-domain approach based on a linearized system model using eigenvalue techniques and a time-domain scheme based on a nonlinear system model subject to various disturbances are both employed to simulate the effectiveness of the proposed control scheme. It can be concluded from the simulated results that the proposed STATCOM joined with the designed damping controller is very effective to stabilize the studied system under disturbance conditions. The voltage fluctuations of the AC bus subject to the active-power variations of the studied system can also be effectively controlled by the proposed control scheme.
Keywords :
asynchronous generators; eigenvalues and eigenfunctions; frequency-domain analysis; offshore installations; squirrel cage motors; stability; static VAr compensators; time-domain analysis; voltage control; wind turbines; AC bus; DFIG; MCF; MCT; OWF; SCIG; STATCOM; WT; active-power variation; damping enhancement; doubly-fed induction generator; dynamic stability improvement; eigenvalue technique; equivalent marine-current turbine; equivalent squirrel-cage rotor induction generator; equivalent wind turbine; frequency-domain approach; integrated grid-connected offshore wind farm; marine-current farm; modal control theory; nonlinear system model; power 40 MW; power 80 MW; static synchronous compensator; time-domain scheme; voltage control; voltage fluctuation; Automatic voltage control; Control systems; Damping; Eigenvalues and eigenfunctions; Mathematical model; Wind speed; Dynamic stability; marine-current farm; offshore wind farm; static synchronous compensator;
Journal_Title :
Power Systems, IEEE Transactions on
DOI :
10.1109/TPWRS.2010.2061878