access icon openaccess Performance analysis of automatic generation control of interconnected power systems with delayed mode operation of area control error

This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Received 13/03/2015, Accepted 01/04/2015, Published 09/04/2015

This study presents automatic generation control (AGC) of interconnected power systems comprising of two thermal and one hydro area having integral controllers. Emphasis is given to a delay in the area control error for the actuation of the supplementary controller and to examine its impact on the dynamic response against no delay which is usually the practice. Analysis is based on 50% loading condition in all the areas. The system performance is examined considering 1% step load perturbation. Results reveal that delayed mode operation provides a better system dynamic performance compared with that obtained without delay and has several distinct merits for the governor. The delay is linked with reduction in wear and tear of the secondary controller and hence increases the life of the governor. The controller gains are optimised by particle swarm optimisation. The performance of delayed mode operation of AGC at other loading conditions is also analysed. An attempt has also been made to find the impact of weights for different components in a cost function used to optimise the controller gains. A modified cost function having different weights for different components when used for controller gain optimisation improves the system performance.

Inspec keywords: power generation control; power system interconnection; load management; particle swarm optimisation; hydroelectric power stations; thermal power stations; dynamic response

Other keywords: area control error; wear reduction; hydro area; automatic generation control; thermal area; delayed mode operation; integral controllers; tear reduction; performance analysis; dynamic response; modified cost function; system performance improvement; interconnected power systems; step load perturbation; AGC; supplementary controller actuation; loading conditions; controller gain optimisation; particle swarm optimisation

Subjects: Control system analysis and synthesis methods; Thermal power stations and plants; Hydroelectric power stations and plants; Optimisation techniques; Control of electric power systems; Power system management, operation and economics; Optimisation techniques

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