SciELO - Scientific Electronic Library Online

vol.25 issue2Optimization and effects of process variables on the production and properties of methyl ester biodieselUse of hybrid solar-wind energy generation for remote area electrification in south-eastern Nigeria author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Journal of Energy in Southern Africa

On-line version ISSN 2413-3051
Print version ISSN 1021-447X


JEEVAJOTHI, R  and  DEVARAJ, D. Voltage stability enhancement using an adaptive hysteresis controlled variable speed wind turbine driven EESG with MPPT. J. energy South. Afr. [online]. 2014, vol.25, n.2, pp.48-60. ISSN 2413-3051.

This paper investigates the enhancement in voltage stability achieved while connecting a variable speed wind turbine (VSWT) driven electrically excited synchronous generator (EESG) into power systems. The wind energy conversion system (WECS) uses an AC-DC-AC converter system with an uncontrolled rectifier, maximum power point tracking (MPPT) controlled dc-dc boost converter and adaptive hysteresis controlled voltage source converter (VSC). The MPPT controller senses the rectified voltage (VDC) and traces the maximum power point to effectively maximize the output power. With MPPT and adaptive hysteresis band current control in VSC, the DC link voltage is maintained constant under variable wind speeds and transient grid currents.The effectiveness of the proposed WECS in enhancing voltage stability is analysed on a standard IEEE 5 bus system, which includes examining the voltage magnitude, voltage collapse and reactive power injected by the systems. Simulation results show that the proposed WECS has the potential to improve the long-term voltage stability of the grid by injecting reactive power. The performance of this scheme is compared with a fixed speed squirrel cage induction generator (SCIG), a variable speed doubly-fed induction generator (DFIG) and a variable speed permanent magnet synchronous generator (PMSG).

Keywords : variable speed wind turbine; EESG; MPPT; adaptive hysteresis band current control; SCIG; DFIG; PMSG; voltage stability.

        · text in English     · English ( pdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License