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Facts based voltage sag mitigation and stability improvement in induction generator based wind farms

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  1. Abstract
  2. Introduction
  3. Electrical modeling and requirements of fixed speed induction generators
  4. Modeling and control of statcom
    1. Equivalent circuit of Statcom
  5. Modeling of statcom
    1. Transient stability model of statcom
    2. PWM control
  6. Simulation results
  7. Conclusions
  8. References

In recent years generation of electricity using directly connected asynchronous generator (induction generator) based Wind Energy Conversion Systems (WECS) has received considerable attention world wide. The connection of these Fixed Speed Induction Generators (FSIG) to the Point of Common Coupling (PCC) in the electrical grid network is one of the major concerns of the transmission system planners. Reactive power system and ride through capability are the primary issues to meet the grid code requirements for the wind. In this paper the impact of a Static Synchronous Compensator (STATCOM) with FSIGs for dynamic and steady state operation in the presence of voltage fluctuations is proposed. The simulation results demonstrated the effectiveness of the STATCOM device in stabilizing the Fixed Speed Wind Energy Conversion Systems (FSWECS) using dynamic reactive power compensation. The simulation analysis is performed using Power System Computer Aided Design (PSCAD)/Electromagnetic Transient Program with DC Analysis (EMTDC) software simulation package.

Keywords : Wind Energy Conversion Systems (WECS), Fixed Speed Induction Generators (FSIG), Point of Common Coupling (PCC), Flexible AC Transmission Systems (FACTS), Reactive Power compensation (RPC), Voltage stability.

[...] When compared to the conventional voltage control practices, FACTS controllers like STATCOM offers dynamic reactive power compensation and provides superior voltage support capability Electrical Modeling and Requirements of fixed speed induction generators Wind farms with induction generators generate real power and consume reactive power. Fig2 illustrates the single line diagram of a wind power generation unit, connected to a power system network. Fig 2 Single line diagram of a WECS The dynamic representation of single cage FSIG is based on 5th order model. [...]


[...] The VSC switching strategy is based on a sinusoidal PWM technique which offers simplicity and good response. The controller input is an error signal obtained from the reference voltage and the value rms of the terminal voltage measured. Such error is processed by a PI controller the output is the angle ?, which is provided to the PWM signal generator. An error signal is obtained by comparing the reference voltage with the rms voltage measured at the PCC. The PI controller processes the error signal and generates the required angle to drive the error to zero. [...]


[...] N.G.HingoraniandL.Gyugyi,Understanding FACTS: Concepts and Technology of Flexible AC Transmission Systems. Piscataway, NJ: IEEE Press Ekanayake, J3, Holdsworth, Wu, Jenkins, N.:?Dynamic modelling of Doubly Fed Induction generator wind turbines'. IEEE Transaction on Bwer Systems, vol May 2003. Holdsworth, L., Wu, .G, Ekanayake. J.B, Jenkins, N.: ?Comparison of fixed speed and doubly-fed induction wind turbines during power system disturbances'. IEE Proceedings: Generation, Transmission, Distribution, vol May 2003. S.Lundberg, T.Thiringer, and T.Petru, ?Electrical limiting factors for wind energy installations in weak grids,?Int.J.Renewable Energy Eng., vol.3, no [...]

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