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With increasing wind power in power systems, impact of wind generators on subsynchronous resonance (SSR) is of interest. Previous research has shown the impact of wind generation on SSR. In this paper, a control strategy is developed utilizing the power converters' control capability in a doubly fed induction generator (DFIG)-based wind turbine system. The control is realized through modulating the...
This paper studies the various aspects of input/output selection for wide-area damping controllers, targeted at the power system inter-area oscillation modes. The objectives is to choose a control loop which has large impact to a few selected modes, while does not affect the other system modes, hence the interactions problem can be greatly reduced. For this purpose, a new modal interaction index is...
The application of simple fuzzy power systems stabilizers (SFPSSs) to enhance the damping of inter-area oscillations of the Mexican Interconnected System (MIS) is presented. In particular, the work is focused on improving the damping of one of the most critical oscillation modes of the MIS: the north-south inter-area mode. The SFPSSs used in this work are characterized by a significantly reduced fuzzy...
Many on-line and off-line methods have been advanced by researchers for identifying small signal modes in power systems. Identification methods employed off-line can also be used outside of the traditional on-line prediction scenarios. These methods can assist in the design of damping mitigation devices for critical small signal mode events. In this paper, several scenarios will be studied to determine...
This paper presents an optimal tuning of Power System Stabilizers (PSS) for a multi-machine power system using Population-Based Incremental Learning (PBIL) algorithm with adaptive learning rate. The proposed (APBIL) algorithm can adjust the learning rate automatically according to the degree of evolution of the search. The objective of the design is to achieve adequate stability over a wide range...
The increasing presence of single-phase distributed generators and unbalanced loads in the electric power system may lead to unbalance of the three phase voltages, resulting in increased losses and heating. To decrease this voltage unbalance problem three-phase four-wire inverter-connected distributed generation units may be used. In this paper, the influence of the control strategy of three-phase...
This paper focuses on analyzing the impact of electromechanical oscillations caused by distributed synchronous generators on power distribution systems from the power quality point of view. The electromechanical oscillations are natural responses of synchronous generators to a mismatch in their net torques, and thus, are present in every distribution system equipped with such generators. In this work,...
Static Synchronous Series Compensator (SSSC) is one of the second generation Flexible AC Transmission System (FACTS) controllers. In this paper, an active damping control strategy for the SSSC is proposed to mitigate subsynchronous resonance (SSR) in the series compensated power system. A multimode controller design method is developed to suppress multiple unstable torsional frequencies separately...
In this paper we report on the preliminary results of a collaborative investigation effort between researchers in North America and Europe aiming to baseline the electromechanical modes and mode shapes of the Nordic system from synchronized phasor measurement data. We provide an overview on the Danish power grid and its interconnections, and describe the features of an experimental phasor measurement...
A method of tracking a power system's electromechanical mode shape and coherence over time is presented. It uses an algorithm of weighted-updates to efficiently compute an existing spectral estimation algorithm. The advantage of this over other mode shape estimators is that it overcomes the assumption that the system being estimated is stationary. The relationship between spectral densities and mode...
Wide-area measurements have been proposed to coordinate generator excitations and Static Var Compensator (SVC) auxiliary controls. The wide-area coordinating controller (WACC) utilizes remote signals to compensate the interactions between SVC and generator variables, therefore it provides an additional damping of both local and inter-area oscillations. However time delays introduced by remote measurement...
A case study on the Australian equivalent system - recently adopted as an IEEE benchmark for stability studies - is presented here to illustrate power oscillation damping through HVDC links. Wide-area signals are used for supplementary modulation of the HVDC power order driven through a multivariable controller. The test case is set up in DIgSILENT and benchmarked against the standard results. Linearized...
For the purposes of planning it is necessary to determine, in a transmission system, which are the best signals for estimating the parameters of the electromechanical modes, given the characteristics of the modal estimator. Closed-form mathematical expressions are derived in another paper for the Power Spectral Densities (PSDs) of the candidate signals at selected locations due to random fluctuations...
The residue analysis is primary basis for signal selection for damping the inter area oscillations employing flexible AC transmission system (FACTS) controller. The control signals should be selected to get the best residue possible under a large number of operating conditions. This ensures a high modal controllability and modal observability of the selected modes to be damped. The present work analyzes...
Adaptive phasor power oscillation damping controllers (APPODs) produce superior large signal performance with very little reliance on accurate system models. However, recursive phasor estimation, online frequency correction and adaptive phase-shift are involved which makes modeling such APPODs difficult in stability studies. Possible interaction with other controllers (e.g. lead-lag compensators)...
Oscillation damping via variable speed wind generators have been addressed in literature. Among the techniques, active power modulation has been studied. However, active power is closely related with electromagnetic torque. Modulating active power can introduce oscillations in the torque. This is undesired. The objective of this paper is to study an alternative technique - reactive power modulation...
Interarea oscillatory modes pose a threat to power system stability. An algorithm is presented for the identification and analysis of such modes from high resolution phasor measurement data. The process outlined includes data collection, conditioning, extraction of the primary oscillatory frequency, and determination of participating areas of the system. Additionally a visualization methodology is...
Summary form only given. The paper applies the method of eigenstructure assignment for the design of a controller for a wind generation scenario in Northern Scotland based on doubly-fed induction generators (DFIGs). The designed controller serves the combined purpose of a conventional power system stabilizer (PSS) and an active damping controller and provides a contribution to both network and shaft...
Summary form only given. The paper presents a new series capacitive compensation concept, which enhances power system dynamics. The idea behind the concept is a series capacitive compensation which provides balanced compensation at the power frequency while it results in phase imbalance at other frequency of oscillations. The compensation scheme is a combination of a single-phase Thyristor Controlled...
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