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

Author(s):

Nisha Singh, S.K. Gupta and Yogendra Arya*   Pages 1 - 10 ( 10 )

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.

Result: 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, hydro power system, AC/DC parallel links

Affiliation:

Maharaja Surajmal Institute of Technology, Department of Electrical & Electronics Engineering, Department of Electrical Engineering, Deenbandhu Chhotu Ram University of Science and Technology, Murthal, Sonepat, Haryana, MSIT, Department of Electrical & Electronics Engineering



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