Abstract—This paper discusses the impact of HVDC on Power System Stability and proposes a new control mechanism based on Fuzzy set theory to augment dynamic performance of a multi-machine power system. To have good damping characteristics over a wide range of operating conditions, deviations in speed and acceleration of the machines are chosen as the input signals to the fuzzy controller. These input signals are first characterized by a set of linguistic variables using fuzzy set notations .The fuzzy relation matrix allows a set of fuzzy logic operations that are performed on controller inputs to obtain the desired output. The effectiveness of the proposed controller is demonstrated by a multi-machine system example. The performance of this fuzzy controller, in comparison to the conventional fixed gain controller, demonstrates the efficacy of this new fuzzy PID controller.
Index Terms—HVDC, Eliminated variable method, Power System Stability, Multi–Machine Stability, Current controller, Fuzzy Logic Controller
M. Uma Vani is with the Lakireddy Balireddy College of Engineering, Mylavaram, Andhra Pradesh, India (corresponding author, phone:08659-222629; fax: 08659-222931; e-mail: email@example.com).
P. V. Ramana Rao is with the National Institute of Technology, Warangal, Andhra Pradesh, India (e-mail: firstname.lastname@example.org).
S. V. Jayaram Kumar is with the Jawaharlal Nehru Technological University, Hyderabad, Andhra Pradesh, India (e-mail: email@example.com).
Cite: Uma Vani Marreddy, Ramana Rao P. V. and Jayaram Kumar S. V., "Fuzzy Logic Controller for Enhancement of Transient Stability in Multi Machine AC-DC Power Systems, " International Journal of Engineering and Technology vol. 2, no. 5, pp. 423-429, 2010.