Power System Oscillations Damping by Robust Decentralized DFIG Wind Turbines

Abstract

-This paper proposes a new robust decentralized power oscillation dampers (POD) design of doubly-fed induction generator (DFIG) wind turbine for damping of low frequency electromechanical oscillations in an interconnected power system. The POD structure is based on the practical 2 nd -order lead/lag compensator with single input. Without exact mathematical model, the inverse output multiplicative perturbation is applied to represent system uncertainties such as system parameters variation, various loading conditions etc. The parameters optimization of decentralized PODs is carried out so that the stabilizing performance and robust stability margin against system uncertainties are guaranteed. The improved firefly algorithm is applied to tune the optimal POD parameters automatically. Simulation study in two-area four-machine interconnected system shows that the proposed robust POD is much superior to the conventional POD in terms of stabilizing effect and robustness.

Review of DFIG wind turbine impact on power system dynamic performances

“…Study results in Refs. not only confirm the damping performance but also guarantee the robustness of the designed POD. In , the coordinated GSC and RSC controls are proposed to enlarge the system stability margin.…”

“…The robust decentralized POD design based on the enhancement of the system robust stability margin using the inverse multiplicative perturbation is presented in Ref. . Study results in Refs.…”

“…Besides, the POD is installed in the RSC control loop to damp out the following oscillation. The design techniques in Refs are conducted in the linear system model at one operating state while the control effect of the designed PODs is evaluated at various operating states.…”

Power oscillation damping control by PSS and DFIG wind turbine under multiple operating conditions

“…In [9], the optimal tuning of a POD using mixed H 2 / H ∞ control was presented to obtain the robustness of the POD against various system operations. In [10], a robust decentralized POD design to improve the system's robust stability margin by inverse multiplicative perturbation was proposed. Nevertheless, the design methods in [7][8][9][10] were carried out under set operating conditions.…”

“…In [10], a robust decentralized POD design to improve the system's robust stability margin by inverse multiplicative perturbation was proposed. Nevertheless, the design methods in [7][8][9][10] were carried out under set operating conditions. They cannot guarantee the damping performance of the designed PODs under other operating conditions.…”