Impact of RFB and PLL Dynamic on Combined ALFC-AVR Regulation of Multiarea Multisource System Under Deregulated Environment with AC/Accurate HVDC link

ABSTRACT

The paper discusses the coordinated effect of redox flow battery (RFB) and accurate high voltage dc (AHVDC) link on the combined voltage and frequency control of two-area systems under deregulated environment. Each area has three generating companies (GENCOs) and three distribution companies. GENCOs in Area-1 are thermal, realistic dish-Stirling solar thermal system (RDSTS) and solar thermal power plants, and in Area-2 GENCOs are hydro, RDSTS, and geothermal power plants. Appropriate nonlinearity constraints are equipped with both hydro and thermal units. A maiden attempt has been made to employ a cascaded fractional-order PD with filter and PID with filter (CFOPDN-PIDN) as a secondary controller for the considered system. Artificial flora algorithm is used to optimize the controller parameters under various system conditions. The proposed CFOPDN-PIDN controller yields better system dynamic responses than the PIDN controller for the Poolco, bilateral, and contract violation power transactions. The investigations reveal that the parallel operation of the AC/AHVDC links deteriorates the system dynamics having more oscillations and peak deviations compared to individual AC and AHVDC links. The dynamic effect of Phase-Lock-Loop (PLL) is important for the realistic operation of AHVDC link. A novel approach for analyzing the dynamic effect of the AHVDC links considering PLL effects during the coordination with the AC system is presented. By adding the dynamic model of PLL to the parallel AC/AHVDC link, the system's performance is improved. The analysis reflects that the RFB-AHVDC links with PLL dynamics provided better system damping than the RFB-AC tie-line and AC tie-line alone.

KEYWORDS:

• Accurate HVDC link
• Artificial flora algorithm (AFA)
• Cascade FOPDN-PIDN (CFOPDN-PIDN) controller
• PLL Dynamics
• Redox flow battery

DISCLOSURE STATEMENT

No potential conflict of interest was reported by the author(s).

Additional information

Notes on contributors

Biswanath Dekaraja

Biswanath Dekaraja received BE degree in electrical engineering from Assam Engineering College affiliated to Guahati University, Guwahati, Assam in 2003 and Master of Electrical Engineering (MEE) from Jadavpur University, Kolkata, West Bengal in 2012. He is working as a full-time PhD research scholar in National Institute of Technology Silchar, India since 2019. His current research interests include power systems, automatic generation control, FACTs, renewable energy sources, and energy storage devices.

Lalit Chandra Saikia

Lalit Chandra Saikia was born in Assam, India, received his BE from Dibrugarh University, Assam, in 1993. Saikia joined in North Eastern Drilling & Work over Services Company (Pvt) Ltd, Digboi, Assam in December 1992 as an Electrical Engineer. In December 1993, he joined as a Rig electrical engineer in ONGCL Recapicol, Sibasagar, Assam and worked till 1997. He started his teaching life as lecturer (Part Time) in Jorhat Engineering College, Jorhat, Assam in 1997. In 2000, Saikia joined as a lecturer in Electrical Engineering Department, NIT Silchar. He received his MTech degree in power systems from Indian Institute of Technology (IIT), Delhi in 2007. He received PhD degree in electrical engineering from National Institute of Technology (NIT) Silchar, Assam in April 2012, where he is currently associate professor of the Department of Electrical Engineering. He works in the field of power systems, soft computing application in power systems, power quality, power system control and operation. Email: [email protected]