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Author: h.gras
Type: Model
Downloaded: 99 times
Date: 2022-10-20

Dynamic Exponential Load

Description:
This device is an implementation of the three-phase exponential load model. The load active power and reactive power vary as function of its voltage amplitude and frequency. This device is implemented... see more as described in [1]. It allows to perform classical and sophisticated dynamic-stability studies in EMTP. This device can be used in the load flow and time-domain simulations.

During the load initialization, the initial active power and initial reactive power are used to find the load-flow. The load voltage magnitude and phase with update from the load flow results automatically.
[1] "Load representation for dynamic performance analysis (of power systems)," IEEE Transactions on Power Systems, vol. 8, no. 2, pp. 472-482, May 1993.

Tag(s): dynamic, load, frequency, exponential, stability,

Author: h.gras
Type: Example
Downloaded: 95 times
Date: 2021-03-09

Ramp limiter

Description:
This example contains static and dynamic current limiter (control) devices

Tag(s): ramp, limiter, control

Author: n.sene
Type: Publication
Date: 2015-04-02

lCT -power Co-simulation Platform for the Analysis of Communication-based Volt/Var Optimization in Distribution Feeders

Description:
The paper presents an ICT and power co-simulation platform for the analysis of the voltlvar control and relevant optimization in medium voltage distribution feeders, achieved by means of a system of d... see moreistributed controllers coordinated via a shared band-limited digital communication network. The platform has been built by realizing the interface between two specific simulation environments:
the Electromagnetic Transient Program EMTP-RV and the communication network simulator Opnet Modeller. The preliminary results provide basic indications on the expected performances of the considered communication-based strategies for ditJerent tratlic congestion levels and load/generation dynamic variations.

Authors: Riccardo Bottura, Alberto Borghetti, Fabio Napolitano, Carlo Alberto Nucci

Tag(s): Co-simulation, Networked Control Systems, Power distribution feeders, Voltlvar optimization.

Author: n.sene
Type: Publication
Date: 2015-04-02

Simulation of the Volt/Var Control in Distribution Feeders by Means of a Networked Multiagent System

Description:
The adoption of networked multiagent systems (MAS) has been recently proposed for the solution of the volt/var control (VVC) problem in distribution feeders. However, constraints and limitations due t... see moreo the communication network, to the dynamic behavior of power system components and regulators, as well as to the measurement uncertainties of the adopted sensors need to be specifically analyzed for the design of the MAS. For this purpose, a cosimulation platform has been built by the integration of two simulation tools:
1) the electromagnetic transient program EMTP-rv; and 2) the communication network simulator Riverbed-OPNET Modeler. This paper presents the modeling and simulation of an asynchronous leaderless MAS-based approach that coordinates the reactive power outputs of a set of power compensators equipped with phasor measurement units via a shared band-limited packet-switched digital communication network. The effects of communication network latency and packet loss on the VVC performances are analyzed for two unbalanced IEEE Test feeders equipped with on-load tap changer transformers. The paper compares the results obtained by using a transmission control protocol (TCP) and a user datagram protocol (UDP), for different levels of background traffic (BT) and different packet discard ratios (PDRs) in the communication links.

Authors: Riccardo Bottura, Student Member, IEEE, and Alberto Borghetti, Senior Member, IEEE

IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS, VOL. 10, NO. 4, NOVEMBER 2014

Tag(s): Cosimulation, medium voltage distribution feeders, multiagent systems (MAS), networked control systems (NCS), phasor measurement unit (PMU), volt/var control (VVC).

Author: n.sene
Type: Publication
Date: 2015-04-01

Analysis of black-startup and islanding capabilities of a combined cycle power plant

Description:
The paper presents the analysis of black-startup and islanding capabilities of an 80 MW combined cycle power plant. The analysis is carried out by means of a computer dynamic simulator suitably develo... see moreped in the EMTP-RV simulation environment in order to represent both the power plant and the local network with the relevant loads. The paper describes the main characteristics of the implemented models and presents the analysis of transients due to both energization and islanding manoeuvres. The former simulations aim at verifying the feasibility of the energization of the path from a turbo gas unit, with autonomous black-start capabilities, to the local distribution network loads. The latter simulations allow the analysis of different islanding strategies for rather large levels of power exported to the external transmission network.

Authors: A. Borghetti, C.A. Nucci, M. Paolone, M. Bosetti, G. Ciappi, A. Solari

Tag(s): black-startup, islanding, combined cycle, power plant, energization