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Author: h.gras
Type: Model
Downloaded: 28 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: Mihajlo
Type: Model
Downloaded: 99 times
Date: 2020-09-04

Active Harmonic Filter

Description:
The shunt filter injects the current that is defined as the error between the (non-linear) load current and the fundamental harmonic. The filter uses a 3-level inverter and the 2-level hysteresis curr... see moreent control.

Tag(s): filter, AHF, active filter

Author: h.gras
Type: Example
Downloaded: 178 times
Date: 2019-04-16

Load-flow voltage violation assessment

Description:
This example shows a way to automatically detect voltage violations of the load-flow results.
Users can set low and high limits for each bus (for example 0.95pu-1.05pu).

Tag(s): voltage, violation, load-flow

Author: h.gras
Type: Example
Downloaded: 300 times
Date: 2018-01-02

Change load power from an external file

Description:
This example illustrates how to read data from an external file and automatically update devices parameters in the design. In this example, the device is a load.
Double click on Update Parameters... see more device to start the script.

Tag(s): script, parametric, file, external, automate, Load

Author: thpapad
Type: Document
Downloaded: 113 times
Date: 2017-11-03

MIMO-OFDM Narrowband-PLC in Distribution Systems: Impact of Power Transformers on Achievable Data Rates

Description:
Power-line communication (PLC) is gaining a renewed interest, due to the smart grid (SG) emerging communication requirements. Among other communication technologies, PLC is a very efficient and feasib... see morele solution, especially for the extended SG distribution networks. However, it is very challenging to consider both the medium- and low-voltage parts of the distribution network as a whole communication medium, due to the attenuating effects of distribution transformers, limiting PLC applicability. In this paper, data transmission through distribution transformers is investigated by means of multiple-input multiple-output (MIMO) narrowband power-line communication (NB-PLC) system, utilizing orthogonal frequency-division multiplexing (OFDM) technology. Multi-conductor distribution line and measurement-based transformer models are developed to characterize the MV-LV PLC channel. In addition, OFDM signal processing techniques are applied to enhance the achievable data rates. The transmit power budget and bit allocation across the OFDM sub-channels of the spatial beams are optimized to maximize the data rate through the distribution transformer. The achievable data rates are calculated and systematically analysed for different scenarios to investigate the effects of the distribution lines, connected loads, noise models, etc. Results reveal the superiority of the proposed MIMO design against the traditional SISO systems. In addition, the possibility for an extensive and reliable application of MV-LV PLC communications through distribution transformers is shown.

Tag(s): Distribution lines, distribution transformers, MIMO-OFDM, power-line communication, smart grids