Voltage stability in power network when connected wind farm generators

Abstract

This paper presents voltage stability in power systems when connected by wind farm generators. Two models of wind generator, namely squirrel cage induction generator and doubly fed induction generator are used and based on steadystate model. P-V curve is used to express maximum loading factor in power system when wind farm was installed. The test IEEE 14 bus system is selected to show proposed performance. The results of this paper can be shown that maximum loading factor before install wind farm generator is 0.70398 p.u. The weakest bus is bus no.14. Therefore, loading factor of system that connects two types of wind turbine with 7 m/s wind speed are 0.8688 p.u and 0.7997 p.u respectively. To improve the voltage stability, FACTS device is selected. The results show that STATCOM can improve maximum loading factor better SVC for both types of wind farm generator. Maximum loading factor increased when setting STATCOM up to 56.33% and 53.28% in systems that connected squirrel cage induction generator and doubly fed induction generator wind turbine respectively. Therefore, this methodology can give direct advantage for organization that are responsible to built convincing of power system in study the respond of setting wind turbine generator on voltage stability. Index Terms--Voltage Stability, Wind Turbine Generator. I. NOMENCLATURE FACTS Flexible AC transmission system SCIG Squirrel-cage induction generator DFIG Doubly-fed induction generator STATCOM Static synchronous compensator SVC Static var compensator P Real power at wind farm generator Q Reactive power at wind farm generator V Bus voltage dc V DC-link voltage ref V Reference voltage dc ,ref V DC-link reference voltage C X Capacitive reactance m X Magnetizing reactive X Total reactance between stator and rotor winding S R Stator resistance r R Rotor resistance c R Capacitive resistance 1 X Stator reactance 2 X Rotor reactance s Slip s I Stator current r

Voltage Profile Analysis on a Grid with Power Injection from a Wind Farm

“…From Table 3, references [19,20] found that the VQ sensitivities are highest for buses 14, 10, 12 and 11 which is similar to this paper. Furthermore, references [19,21,22] found that the weakest bus was bus 14, and injection wind turbine power was done at this bus. This was one of the buses selected in this paper in addition to buses 09 and 10 to be able to have more values for assessment.…”

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

“…The installation of the STATCOM into the power system is by shunt connection at the point of common coupling. 19 The reactive power of the STATCOM is produced by means of power electronic equipment of the VSC type. The VSC converts the DC voltage into a three-phase set of output voltages with the desired amplitude, frequency and phase.…”

Improvement of Transient Voltage Stability of the Wind Farm Using SVC

“…With the size and numbers of wind farm is continuously increasing, and the problems of wind power grid are more and more serious [2]. A large number of literatures at home and abroad analyze different reactive power compensation devices and their compensation effects including voltage stability [3], power quality [4][5][6][7], system transient stability [8] and so on. At present, wind farm mostly uses asynchronous wind power generators.…”