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Due to increasing penetration of wind power generation, new challenges are originating from the intermittent nature of wind. Some of the challenges are maintaining frequency stability and output power smoothening. These will necessitate the control of wind turbines in order to maintain the stability rather than extracting the maximum power. This paper proposes a new control scheme for the output power...
The tools used for assessment of rotor angle stability should be able to estimate the domain of attraction and the ensuing control laws which would aid in enhancing it. The widely used energy function formulations have limitations in being extended for lossy N-machines owing to the presence of transfer conductances obtained due to the modeling approaches used in transient stability studies. This problem...
With the rapid increase of wind penetration in power systems, researchers have looked at various consequences of wind integration. Short-circuit current contribution of wind generators is one of these concerns. Numerous studies have been carried out with different models of wind generators to plan and operate power systems accounting short-circuit current contributions of WGs. Fixed speed, semi variable...
This paper, first, develops the reactive power capabilities of wind power generator and then discusses reactive power ancillary services issues related to the wind farms in the electricity market. Presently, the doubly fed induction generator (DFIG) system, with partial rated power electronic converters in the rotor circuit, is the most popular and widely used for the wind power generation due to...
This paper investigates the possibility of using a nonlinear estimator for estimating the internal variables of a synchronous generator, such as the rotor angle, from the data acquired from phasor measurement units (PMUs). A divide-by-difference filter (DDF) has been used for accurate estimation of the rotor angle of the generator. The proposed rotor angle estimator utilizes the measurements of the...
This paper presents a nonlinear reduced order observer for rotor position estimation of sensorless permanent magnet brushless DC motor. The PMBLDC motors are widely used as they possess high power density and are simpler to control. However the operation of PMBLDC motor, demands the knowledge of rotor position as a prerequisite. In most of the drive systems, the rotor position sensors and encoders...
For a class of multivariable nonlinear systems a sufficient condition for the existence of control to generate output which asymptotically tends to a given real analytic vector function is derived. A prefilter (right inverse) is constructed to generate the required control. Based on this result, a control to steer the alert state of an interconnected power system to a secure state is derived. The...
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