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Optimal Power-Frequency Control in Deregulated Thermal, Hydro and Hydrothermal Power Systems with AC-DC Links

[ Vol. 12 , Issue. 5 ]

Author(s):

Yogendra Arya*, Sushil K. Gupta and Nisha Singh   Pages 414 - 424 ( 11 )

Abstract:


Background: A comparative analysis of Automatic Generation Control (AGC) of two-area electric power systems interconnected by AC and AC-DC links under deregulated environment is conducted. Each area has Thermal-Thermal (TT), Thermal-Hydro (TH) and/or Hydro-Hydro (HH) multiple power sources. A maiden attempt is made to study the demeanour of HH power system under restructured mode.

Methods: The state space models of the power systems have been developed to simulate all market transactions probable in a deregulated power environment and optimal proportional integral structured controller is applied to improve the dynamic performance. The concept of DISCO participation matrix is harnessed to simulate the transactions.

Results: Eigenvalue analysis is carried out to assess the comparative stability analysis of the power systems with/without AC-DC links. Further, the dynamic responses of TT, TH and HH power systems are contrasted in the presence of AC link and AC-DC links. The inclusion of AC-DC links improves the dynamic performance of all the systems remarkably, however, the responses of HH system are sluggish/poor with large undershoots in comparison to TT and TH systems. Also, TH system exhibits degraded dynamic performance compared to TT system.

Conclusion: Moreover, optimal controller is found competent to demonstrate the matching of generation with power demand under different market transactions.

Keywords:

Thermal power system, automatic generation control, deregulation, optimal control, optimal control application, hydropower system, AC-DC links.

Affiliation:

Department of Electrical & Electronics Engineering, Maharaja Surajmal Institute of Technology, Janakpuri, New Delhi 110058, Department of Electrical Engineering, Deenbandhu Chhotu Ram University of Science and Technology, Murthal, Sonepat, Haryana 131039, Department of Electrical & Electronics Engineering, Maharaja Surajmal Institute of Technology, Janakpuri, New Delhi 110058

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