Modeling and simulation of a wind farm in the presence of power electronic devices for the enhancement of transient stability

Abstract

A comprehensive comparative study is made of a pitch control system and shunt flexible AC transmission system (FACTS) devices in order to improve large wind farm operation. Transient stability analysis of a large wind farm in the presence of superconducting magnetic energy storage (SMES), static synchronous compensator (STATCOM), static var compensator (SVC) and pitch controller is performed. The proposed control strategy of the STATCOM is based on PWM control; both the angle and the magnitude of the converter output voltage and the proposed SMES control system is based on a PWM voltage-source converter and a two-quadrant DC–DC chopper using an insulated-gate bipolar transistor (IGBT). Furthermore, robust control systems are designed for SVC and pitch controllers. To investigate the operation of the wind farm with contribution of these devices, two scenarios are considered and simulated. First, extensive analysis of a symmetrical three-phase fault and its effects on system operation is carried out. A permanent fault due to unsuccessful reclosing is analysed; this is one of the most noticeable features of this study. PSCAD/EMTDC software is used for modeling and simulation of the system components and proposed control strategies for power electronic interfaces. System performance analysis under different operating conditions and performance indices show the effectiveness of the proposed controllers even when a severe fault is applied.

Stability Improvement of Isolated Wind-Diesel System with Optimized STATCOM Controller

“…The reactive power needed by the load eventually shifts to STATCOM when steady state is reached. In earlier works for the similar rating of system optimized using ISE criteria only the improvement in overshoot and undershoot have been reported [10][11][12][13][14][15][16][17][18]. But, it can be seen that the overshoot in ∆V was mostly in the range of 4X10 -4 and it was highly oscillatory response taking too long to settle around 7 cycles [16].…”

“…But, such demand of IG varies with load and wind, hence the fixed capacitors are the inadequate solution [6]. Alternatively, a family of Flexible AC transmission system (FACTS) devices [7] such as Switched Capacitor, Static VAR Compensator (SVC), [8,9] Static Synchronous Compensator (STATCOM) can supply/absorb reactive power [10][11][12][13][14][15][16][17][18][19][20][21].…”

Application of the superconducting fault current limiter strategy to improve the fault ride-through capability of a doubly-fed induction generator–based wind energy conversion system

“…7 Therefore, it requires additional static or dynamic VAR compensation strategy, in order to provide reactive power during the grid faults. 8 This makes the system complex and inefficient regarding the economic aspects.…”