Minimum headway is one of key factors in railway system operation. Most railway passengers normally expect that a next train will arrive at their platform as soon as possible. Due to economical and safety aspects, headway between two consecutive trains must be kept over its critical value. In this paper, multi-train simulation associated with dynamic load flow program instructed in MATLAB is employed. A 50-km AC railway power system is used for test. This test was conducted by decreasing train headway until voltage collapse occurs. As a result, the minimum train headway that causes the voltage collapse for this test system is 50 s. This confirms that the proposed algorithm can be effectively used to identify the point of voltage collapses in AC railway power systems.
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
This paper presents the response of distribution static synchronous compensator (DSTATCOM). The connection of wind turbines to distribution systems may affect the voltage quality offered to the consumers. One of the factors contributing to this effect is the rapid variations of the wind turbine output power, which cause respective fluctuations in the supply voltage referred to as flicker. This paper presents the design, control and analysis of a DSTATCOM enhanced with an energy storage device when combined with a wind farm comprising fixed speed induction generators, In this paper it is shown that the DSTATCOM, controlled via a decoupled vector control technique, is an effective way of reducing voltage flicker emissions at the point of common coupling, removing the wind speed fluctuations and improving the transient stability of wind farm. Energy storage rating requirements are discussed in relation to the level of power quality obtained.
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