The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The modern power system consists of an integrated, complex, dynamic system. This dynamic system and its power system operation and control needs to be analyzed with numerical simulation. Among many components in the power system operation, load model is one of the least known models. The commonly used models include the ZIP load model and exponential load model. Load parameter representation for dynamic...
Effective control of spinning reserve (SR) is important for economic advanced dispatch (AD). In the conventional AD methods, the SR allocation based on deterministic criterion is hard to keep system response risk within a specified level. So, in this paper, expected demand not supplied (EDNS) is introduced to AD as an index for response risk, and a given EDNS limit is treated as a constraint of AD...
This paper aims at capturing the voltage collapse trajectories beyond the steady state loading limit for power systems immediately following a branch outage. Instantaneous Time Domain Simulations are done with two types of transmission line models: Bergeron Model, and Lumped Parameter Model. The constant power load is modeled as a voltage dependent impedance. The results are compared with the continuation...
In this paper a theoretical framework for the incorporation of the effect of excitation limits on normal form analysis is presented. The limiter action is approximated by a smooth nonlinear type atan function which is incorporated in the power system dynamic model using singular perturbation theory. This generalized limiter model is employed to characterize the limits of a simple DC excitation system...
This paper presents a dynamic model appropriate for power system analysis. This article shows modeling assumptions, derivation of a third order model for a doubly-fed induction generator and its controller models. Due to the detail level, it can be used as a tutorial for students and engineers that are new in this area. A four-bus system with one synchronous machine and one wind turbine is used to...
Based on quasi-steady-state model, the coordinated voltage control problem was represented by an optimization objective subjected to differential-algebraic equations with continuous-discrete time variables. A direct dynamic optimization approach from modern control theories was introduced to solve the dynamic optimization problems. The dynamic optimization problem can be described as nonlinear programming...
This paper presents a new method for determining the site for power system stabilizer (PSS) installation. This method tracks the eigenvalues as they go from the interconnected power system to a decoupled system of single machine infinite buses (SMIB). The site for PSS installation is determined by observing to which machine the unstable eigenvalues from the interconnected system track to the decoupled...
Real-time transient stability simulation is of paramount importance for system security assessment and to initiate preventive control actions before catastrophic events such as blackouts happen. Transient stability simulation of realistic-size power systems involves the solution of a large set of non-linear differential-algebraic equations in the time-domain which requires significant computational...
In this paper, an investigation into the use of Flexible ac Transmission Systems (FACTS) devices to aid damping of low-frequency inter-area oscillations in longitudinal power systems is presented. A linear model of VSC-based FACTS devices that takes into account the dynamics of dc links is developed and incorporated into a production-grade software for small signal analysis of large power systems...
Distributed energy resources (DE) with power electronics (PE) interfaces with the right control are capable of providing reactive power related ancillary services. Voltage regulation in particular has drawn much attention. In this paper the challenges to control multiple DEs to regulate the local voltage in distribution systems is addressed and a decentralized adaptive voltage control method is proposed...
This contribution details the application of a developed interactive visual environment for power system analysis. In principle, it is based on a methodology to obtain the numerical solution of the Ordinary Differential Equations (ODEs) that represent the dynamic behavior of power systems. The methodology relies on the application of Object Oriented Programming (OOP) techniques, so that power system...
Power flow study is one of the most dominant subjects in the field of power system. This paper applies the Groebner Basis (GB) technique to solve power flow problem. The GB technique is a systematic mathematical tool to solve nonlinear polynomial algebraic equations. The technique has capabilities of uncoupling any given set of coupled equations. Uncoupling not only facilitates numerical work, but...
In this paper, we propose a new class of intelligent adaptive control systems based on a system-centric approach for the control of generators under transient operating conditions. The proposed architecture consists of a Model Reference Adaptive Controller (MRAC) operating in parallel with a Radial Basis Function Neural Network (RBFNN) to control generator oscillations in the presence of disturbances...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.