Philippine E-Journals

Design of Pole Placement Power System Stabilizers for Multi-Machine Systems without the External System Information

A. Venkateswara Reddy | Gurunath Gurrala | M. Vijay Kumar

Discipline: Mathematics

 

Abstract:

Pole placement based power system stabilizer designs are well-known for their superior control capabilities compared with the conventional lead-lag power system stabilizers. They require feedback of all the state variables. As power system state variables are generally not measurable they have not seen much of practical realization. In multi machine systems pole placement designs require feedback of other machine states as well. This paper proposes a new approach for the pole placement based PSS. In this paper, recently proposed modified Heffron Phillip’s model is used for the PSS design. Modified Heffron Phillip’s model is derived by taking the secondary bus voltage of the step-up transformer as reference instead of infinite bus. State variables of this model are locally measurable, which makes the pole placement design decentralized and independent of the external system information. The performance of the proposed controller is evaluated on 10 generator 39 bus multi - machine system over a wide range of operating conditions. The proposed PSS performance is found to be better than the conventional PSS.