Static synchronous compensator sizing for enhancement of fault ride‐through capability and voltage stabilisation of fixed speed wind farms

Abstract

High penetration level of wind energy affects the generation profile of the power systems, which impose more stringent connection requirements of wind farms. The ability of wind power plant to remain connected during grid faults is very important to avoid cascaded outages because of power deficit. FACT devices are considered to be a key technology to accomplish these requirements. The implementation of three-level inverter based on a static synchronous compensator (STATCOM) for the improvement of the ride-through and stability of fixed speed wind farms is analysed here. This brings the challenges for system planner to determine the appropriate STATCOM rating. This study provides a simple approach to evaluate the STATCOM rating for voltage-level regulation at the point of common coupling around its pre-specified value. Vector current control is used as robust control to inject the required reactive power from STATCOM. This study emphasizes also on the analysis of torque speed curve to evaluate the induction generator speed limit and for defining the critical clearing time of the fault according to the selected STATCOM rating. Simulation results under fault conditions are performed to validate the enhancement of wind farm low-voltage ride-through capability and increasing the critical clearing time by installing STATCOM.

Enhanced fault location algorithm for smart grid containing wind farm using wireless communication facilities

“…The extracted power of wind turbine depends on three main factors: available wind power, the power curve of the machine, and the machine's response to wind fluctuation as given by [3,6,7] …”

A modified capacitive bridge-type fault current limiter (CBFCL) for LVRT performance enhancement of wind power plants

“…The main purpose of using the DC reactor in bridge circuit is to slow the ramp rate of the increment of the short circuit current sufficiently, so that the controller can turn off the IGBT switch. During this mode, the DC reactor current increases linearly and is approximately given by (11). Considering Figure 5, the difference current between the threshold value (i T ) and pre-fault value (i 0 ) has been defined I d , and the time delay for fault detection and the IGBT is completely turned off has been defined T d .…”

“…9,10 To satisfy the LVRT requirement of the SCIG-based WT, both series and shunt types of devices have been used. Static synchronous compensator (STATCOM), 11,12 thyristor switch capacitor, 13 static var compensator, 14 have been used as shunt options. Dynamic voltage restorer, 15 series dynamic braking resistor (SDBR), 16 unified inter-phase power controller, 17 voltage booster scheme based on continuously variable series braking resistor, 18 gate-controlled series capacitor, 19 and fault current limiters (FCLs) [20][21][22][23][24][25][26][27] are series options.…”

Optimum Resistive Type Fault Current Limiter: An Efficient Solution to Achieve Maximum Fault Ride-Through Capability of Fixed-Speed Wind Turbines During Symmetrical and Asymmetrical Grid Faults

“…In this study, unlike previous work in [8], [17], [27,28], the maximum FRT of the FSWT is obtained by the proposed OR-FCL, considering all the pre-fault situations. Both the fault location and the wind speed variations will be employed in analysis to produce an optimum resistance by the OR-FCL through the use of a special frequency and duty cycle.…”

“…These methods include an energy storage system [16], a static synchronous compensator (STATCOM) [13,[17][18][19], a static synchronous series compensator (SSSC) [19], distributed constant power loads (CPLs) [8], a dynamic voltage restorer (DVR) [20], a series dynamic braking resistor (SDBR) [19,21], a unified power quality conditioner (UPQC) [22,23], capacitor banks [24], a static VAR compensator (SVC) [25] and a unified power flow controller (UPFC) [26].…”