Abstract
This paper presents a new approach for coordinated design of power system stabilizers (PSSs) and static VAR compensator (SVC)-based controller. For this purpose, the design problem is considered as an optimization problem whose decision variables are the controllers’ parameters. Due to nonlinearities of large, interconnected power systems, methods capable of handling any nonlinearity of power networks are mostly preferable. In this regard, a nonlinear time domain based objective function is used. Then, the coyote optimization algorithm (COA) is employed for solving this optimization problem. In order to ensure the robustness and performance of the proposed controller (COA-PSS&SVC), the objective function is evaluated for various extreme loading conditions and system configurations. To show the contribution of the coordinated controllers on the improvement of the system stability, PSSs and SVC are optimally designed in individual and coordinated manners. Moreover, the effectiveness of the COA-PSS&SVC is assessed through comparison with other controllers. Nonlinear time domain simulation shows the superiority of the proposed controller and its ability in providing efficient damping of electromechanical oscillations.
Highlights
Industrialization and population growth are the primary factors for which the consumption of electric energy is steadily increasing
The enhancement of the system stability is taken into account in the objective function in which the time responses of the speeds’ deviations of machines are involved
The coyote optimization algorithm (COA) algorithm is used to optimize the objective function over a wide range of operating conditions and severe fault scenarios
Summary
Industrialization and population growth are the primary factors for which the consumption of electric energy is steadily increasing. It is important to have mesh networks and to work close to the stability limits in order to meet these new requirements The latter oblige power companies and especially electric power transmission companies to operate around their limits of stability, due to the deregulation of modern power grids and the electricity market opening. This imposes an increase in the number of operating diagrams, and the generation of multiple inter-area mode oscillations in the range of 0.17 to 0.4 Hz and local mode oscillations mostly around 1 Hz [1], which can lead to the failure of the network infrastructures. PSS controllers are equipped with lead-lag compensators that are tuned independently by using linear
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