Automatic Generation Control of Multi-Area Power Systems with Parallel EHVAC/ HVDC Inter-Ties
Ram Naresh Mishra1, Prabhat Kumar2
1Ram Naresh Mishra, Assistant Professor, Department of Electrical Engineering, G.L.A. University, Mathura, Uttar Pradesh, India.
2Dr. Prabhat Kumar, Ex-Professor & Chairman, Department of Electrical Engineering, Aligarh Muslim University, Aligarh, Uttar Pradesh, India.
Manuscript received on February 14, 2015. | Revised Manuscript received on February 26, 2015. | Manuscript published on March 05, 2015. | PP: 119-126 | Volume-5 Issue-1, March 2015. | Retrieval Number: A2557035115/2015©BEIESP
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Abstract: This paper applies the modern control theory to design optimal AGC regulators using full state vector feedback for multi-area interconnected hydro-thermal power systems and implemented under considerations in the wake of 1% step load perturbation in thermal/hydro area. For the present study, power system model consists of one area with reheat thermal power plant and two area with hydro power plants having identical capacity. The system interconnection is considered namely (I) EHVAC inter-ties only (II) EHVAC in parallel with HVDC interties. The dynamic model of incremental power flow through HVDC transmission link is derived based on frequency deviation at both rectifier and inverter ends. Moreover, the HVDC link is considered to be operating in constant current control mode. The system responses have been simulated in Mat lab. Responses of deviation in frequencies, deviation in tie line powers (EHVAC as well as HVDC) and integral of area control errors have been plotted for 3- area. Thus, on the basis of these responses, the dynamic performance of the system has been studied. Besides this, to study the closed loop system stability, the closed loop system eigen values are computed.
Keywords: Interconnected power systems; HVDC transmission links; System dynamic performance; EHVAC//HVDC transmission link; Optimal AGC regulator.