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This paper presents a novel approach of excitation controller design for power system with dynamic load where induction motor is considered as the dynamic load. To design the controller, zero dynamic design approach of feedback linearization is used. The zero dynamic design approach is applicable when the system is partially linearized. The paper also presents the linearizability of power system with...
The formulation of Lyapunov function is necessary to analyze the stability of a system. This paper presents an idea for formulating generalized Lyapunov function for the stability analysis of interconnected power systems. Lyapunov function is formulated based on the total energy of power system where the system is considered as a single machine infinite bus (SMIB) system. The negative definiteness...
This paper presents a generalized nonlinear observer design method for interconnected power systems. The concepts of nonlinear coordinate transformation, Lie derivative, and relative degree are used to design the observer for power systems. In this proposed design framework, the both cases are considered-when the relative degree of a nonlinear system is equal to the order of the system and when the...
The selection of output function for nonlinear feedback linearizing controller is an important task as the design of controller depends on the output function of the systems. This paper present a detailed analysis to select the output function to design nonlinear feedback linearizing excitation controller for power systems. Depending on the relative degree of the system which depends on the output...
The design and implementation of a new control scheme for reactive power compensation, voltage regulation and transient stability enhancement for wind turbines equipped with fixed-speed induction generators in large interconnected power systems is presented. The nonlinear behavior of wind turbines has been represented in this paper by an uncertain term, derived from the Cauchy remainder of the Taylor...
Most of the power system networks have significant dynamic loads. In this paper, induction motor is considered as a dynamic load which causes voltage stability problems in power systems. This paper presents an analysis to investigate the critical parameters of power systems with dynamic loads for stability studies. To investigate the critical parameters, a single machine infinite bus (SMIB) system...
This paper analyses the effects of different power system devices on the dynamic transfer capability of transmission lines under varying operating conditions. An investigation on the effect of dynamics loads, wind farms and flexible AC transmission system (FACTS) devices on the transfer capability of a heavily stressed power system is carried out. A comparative study on the enhancement of transfer...
This paper presents a nonlinear control design method for interconnected power systems with induction motors as dynamic loads. To design the controller, a feedback linearization technique is used. The control law is applied through the excitation system of the synchronous generator. The designed controller can provide a stable operation of the systems over a wide range of operating region. In this...
The complexity of power systems has increased in recent years due to the operation of existing transmission lines closer to their limits using flexible AC transmission system devices (FACTS), and also due to the increased penetration of new types of generators that have more intermittent characteristics and lower inertial response, such as wind generators. This changing nature of power systems has...
The reactive power output of compensating devices must be compared at the minimum voltage that is accepted in the grid. This paper analyses the performance of flexible AC transmission system (FACTS) devices during low-voltage recovery transients for different fault conditions. Some critical interactions amongst FACTS devices during low-voltage conditions are also investigated. The reactive power control...
Plug-in Hybrid Electric Vehicles (PHEVs) are likely to be used as an alternative to conventional vehicles due to environmental friendly, energy-wise and cost effective. The effects of large-scale PHEV integration need to be investigated before they are integrated into the existing grid. This paper analyses the impact of PHEV loads on the dynamic behaviour of a power system under both small and large...
Power systems are composed of dynamic loads. In this paper, the induction motors which are widely used in consumption units are considered as dynamic loads. This paper presents an analysis to investigate the effects of large dynamic loads on interconnected power systems with power oscillation damping controller (PODC). The PODC is designed based on the conventional method of linearization. An overview...
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