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Small signal stability is the ability of the marine power system to maintain synchronism when subjected to small disturbance. To improve the stability performance of marine power system, a power system stabilizer (PSS) is introduced into the traditional marine generator excitation system with automatic voltage regulator (AVR). Load compensation is used to control a voltage which is representative...
In this paper a voltage stability analysis is described, which is coupled with an online dynamic security and protection assessment system (DSA). The focus will lie on the calculated indices and their algorithms using time domain simulations. Because the online DSA collects information from four different modules, the voltage stability module, small signal stability module, the transient stability...
This paper presents a novel large-disturbance controller for power systems with significant induction motor (IM) load. Unlike the standard linearisation technique, a linearisation is used where the Cauchy remainder is included in the design process as a bounded uncertainty. Details of the process to obtain a bound on Cauchy remainder are given in the paper; the bound is used to design the robust minimax...
The paper presents a control system based on the multi-agent technique. The control system coordinates different discrete and continuous control devices during the post-disturbance period in order to prevent voltage collapse of the whole system. The model of the test power system was simulated by Matlab/PSAT software. Multi-agent system (MAS) has been implemented in Java language using JADE (Java...
Conventional methods of load shedding are too slow, do not effectively calculate the correct amount of load to shed and lack in operating in a coordinated way. This results in either unnecessary or insufficient load reduction. A new technique should be applied that will be fast and optimal relying on slow communication in order for the distribution network to maintain stability and to improve the...
Considering the practical decentralized control requests in the application of static Var compensator (SVC) to power system, this paper presents a design method of single-object nonlinear decentralized controller based on inverse system theorem, which only uses local measurable variables. In order to overcome the drawback of single-object control to improve stability of system, the signal of line...
In this paper, we analyse the effects of the integration of various types of wind generators into power systems based on available (dynamic) transfer capability (ATC). The amount of static (shunt capacitor) and dynamic compensations (STATCOM) to restore1 and enhance the transfer capability for fixed speed wind generators integration is determined. In addition, we compare the effects of both fixed...
The efficacy and robustness of a nonlinear Power System Stabilizer (NPSS) in comparison with that of a series controlled FACTS device, the Static Synchronous Series Compensator (SSSC), is evaluated in this paper, to reinforce the transient stability of a multi-machine power system. The proposed controller is powered to control the three main parameters affecting the stability of the system; namely...
As the penetration of distributed PV generation increases, its impact on the stability and security of the power system will become more and more significant. Suitable models for the PV generators are needed for studying the dynamics in a power system containing many such distributed PV generators. In this paper, two dynamic models for residential single phase PV converters are developed for fast...
In order to study the applications of ESS in power systems, this paper proposes a standard procedure to develop a full mathematical dynamic model of power systems installed with ESS, which include SMES, AC, BESS and FESS. Results of computer simulation are presented to demonstrate the effect of ESS on power system dynamics. Investigation of power system stability as affected by the installation of...
This paper presents a novel controller based on the delayed feedback control theory for stabilizing unstable torsional oscillations caused by Subsynchronous Resonance (SSR) in power systems. The first system of the IEEE Second Benchmark Model, which consists of a synchronous generator connected to an infinite busbar through two parallel transmission lines, one of which is equipped with a series capacitor,...
After some disastrous instabilities and blackouts, power system voltage stability has drawn even more attention. When a serious fault occurs, proper control should be quickly adopted to terminate the system deterioration. In this paper, a control method based on power flow tracing is presented to enhance power system voltage stability. Firstly, a branch-admittance-decreasing algorithm is introduced...
A Multi-Objective Evolutionary Programming (MOEP) based approach to Static Synchronous Series Compensator (SSSC) has been presented in this paper. The multi-objective optimization problem is formulated to the design problem of SSSC, in which the system transient stability is improved by minimizing several system behavior measure criterions. Then, MOEP is used to design the Flexible Alternating Current...
The paper proposes a two-stage model predictive control (MPC) strategy for alleviating voltage collapse. The first stage uses a static load shedding algorithm to obtain stable MPC prediction simulations. The second stage uses the MPC simulations, and associated trajectory sensitivities, to establish a linear program (LP) that optimizes the control action. This LP builds on trajectory approximations...
This paper presents that when power/voltage automatic control system (AVC) is being applied in provincial dispatching centre, in order to implement reactive power/voltage optimization control on condition of ensuring limited on-line voltage stability margin, monitoring module of on-line voltage stability should be introduced to realize the coordinated closed loop control of on-line voltage stability...
This paper presents a new control design method based on wide-area measurements to coordinate generator excitations and static var compensator (SVC) auxiliary controls. A new state space model comprising a multimachine power system and a SVC is first derived. This model clearly shows the interactions between SVC and generator variables. Next, generator excitations and the SVC auxiliary input are synthesized...
The idea of power system stabilizer (PSS) or supplementary excitation control is to apply a signal through the excitation system to produce additional damping torque of the generator in a power system at all operating and system conditions. In this paper the study of the dynamic behavior and transient stability of the single-machine infinite-bus (SMIB) with used the eigenvalue analysis is presented...
Control designs based on geometric feedback linearization (GFL) and the so-called direct feedback linearization (DFL) technique for power system stability control are presented and compared. The physical integrity of the state space description of a classical single machine infinite bus (SMIB) power system model is preserved with the application of DFL in designing a robust excitation-voltage regulating...
This article is focused on the implementation of fuzzy logic excitation control of a synchronous generator. A simple fuzzy logic control scheme for voltage control and generator stabilization is tested on the real laboratory model that includes digital system for excitation control (based on four DSPs) and synchronous generator connected to an AC system through transformer and two parallel transmission...
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