Improving power system stability in the presence of wind farms using STATCOM and predictive control strategy

Abstract

In this study, a multi-objective predictive control strategy is presented for the stability improvement of a power system in the presence of wind farms and STATCOM. The main contribution of this study is in the multi-objective consideration for controlling the active and reactive powers of the rotor-side converter in each of the induction generators, controlling the voltage of the synchronous generators' excitation system, and designing the damping controller of STATCOM using the predictive strategy. To reduce the computational burden, and to accurately choose the input paths into the predictive control, the Laguerre functions are used. Also, for reducing the sampling time in the selection of large prediction horizons, the exponential data weighting has been employed. The simulation results were evaluated using MATLAB software in the field of time and frequency under different scenarios. Moreover, the obtained results of each domain are compared using the two techniques of the predictive strategy, i.e. the classic model, Laguerre functions, and also the conventional proportional integral controller. The comparison of these three methods reveals that the functional predictive control outfits the two other controllers in damping of the oscillations.

Hierarchical damping controller design in large‐scale power systems including hybrid renewable energy sources for compensation of time delays

“…12 One of the important challenges in the WAMS' design is the time delays produced by communication systems while sending the input signal to the WADC. 13 It has been presented different methods in literature to compensate the time delays, such as: first-and second-order Pade approximation, 14,15 smith's predictor technique, 16,17 phase shifting method, 18 recurrent neural networks, 19 model identification method, 20 model predictive control (MPC), 21 and network predictive control. 22 In the MPC, due to system's linearization around the operating point, the compensation of delay may fail.…”

Ride-Through Control Method for the Continuous Commutation Failures of HVDC Systems Based on DC Emergency Power Control

“…When CF is detected, the emergency power control reference is obtained on the basis of the relative magnitudes of the acceleration area and deceleration area. According to the model predictive control theory [18], the feedback correction calculation of the rotor angle and acceleration area variations of the sending-end system considering the emergency power control is performed. Subsequently, a closed loop rolling control process is achieved.…”

“…Step 6: If no continuous CF is detected, then the emergency power control will exit; otherwise, if continuous CFs are detected, then let j = j + 1 and set the maximum rotor angle variation calculated in the (j − 1)-th CF process as the initial rotor angle of j-th CF. Equation (18) indicates that the equivalent rotor angle variation of the sending-end system that corresponds to each sampling point during the j-th CF can be calculated as…”

Battery Energy Storage System to Stabilize Transient Voltage and Frequency and Enhance Power Export Capability

“…Flexible AC Transmission System (FACTS) devices have been contributing significantly in enhancing power system transient stability (low/high order oscillation) by regulating power flows and enhancing power transfer capacity of transmission system [1]- [3]. Among the multiple FACTS devices, the particular interest of this study is on static synchronous compensators (STATCOM) as this device improves power transfer capability [4], [5], enhances transient stability by regulating voltage [6], ameliorates inter-area oscillation [7] and provides faster and smoother voltage recovery through reactive power compensation [8]. In addition, STATCOM outperforms other FACTS devices in damping power system oscillations [9] and enhancing power transmission capacity in many occasions [10].…”