Abstract
In this paper, a novel nonlinear robust damping controller is proposed to suppress power oscillation in interconnected power systems. The proposed power oscillation damping controller exhibits good nonlinearity and robustness. It can consider the strong nonlinearity of power oscillation and uncertainty of its model. First, through differential homeomorphic mapping, a mathematical model of the system can be transformed into the Brunovsky standard. Next, an extended state observer (ESO) estimated and compensated for model errors and external disturbances as well as uncertain factors to achieve dynamic linearization of the nonlinear model. A power oscillation damping controller for interconnected power systems was designed on a backstepping-fractional order sliding mode variable structure control theory (BFSMC). Compared with traditional methods, the controller exhibits good dynamic performance and strong robustness. Simulations involving a four-generator two-area and partial test system of Northeast China were conducted under various disturbances to prove the effectiveness and robustness of the proposed damping control method.
Highlights
Electromechanical oscillations are inherent in large inter-connected power systems between regions [1]
A nonlinear power oscillation damping controller was introduced in this paper, which was designed by combining the advantages of extended state observer (ESO) and BFSMC theory to reduce power oscillation damping in power systems
According to important oscillation modes with insufficient damping, power oscillation can be reduced by ESO-backstepping fractional order SMC (EBFSMC)
Summary
Electromechanical oscillations are inherent in large inter-connected power systems between regions [1]. Power oscillation damping (POD) for large interconnected power grids has been widely studied, and scholars have proposed numerous improvement approaches. The first category includes methods that use additional equipment, such as flexible AC transmission systems and high-voltage DC devices, which are becoming practical approaches [2,3,4,5]. In power systems, damping capability can be improved by way of the first category; these approaches increase in cost and complexity. A traditional POD controller such as a power system stabilizer (PSS) controller, which has a simple structure and is easy to apply, is designed on the determination model and linear control theory
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