Overcurrent Protection on Voltage-Source-Converter-Based Multiterminal DC Distribution Systems

2007 ◽  
Vol 22 (1) ◽  
pp. 406-412 ◽  
Author(s):  
Mesut E. Baran ◽  
Nikhil R. Mahajan
Keyword(s):  
Distribution Systems ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Overcurrent Protection ◽  
Dc Distribution

Voltage source converter-based topologies to further integrate renewable energy sources in distribution systems

2012 ◽  
Vol 6 (6) ◽  
pp. 435-445 ◽  
Author(s):  
J.M. Maza-Ortega ◽  
M. Barragán-Villarejo ◽  
E. Romero-Ramos ◽  
A. Marano-Marcolini ◽  
A. Gómez-Expósito
Keyword(s):  
Renewable Energy ◽  
Distribution Systems ◽  
Renewable Energy Sources ◽  
Voltage Source ◽  
Energy Sources ◽  
Voltage Source Converter

Comparison between Types of Generation for Wind Turbines Operating in Stochastic Wind

2002 ◽  
Vol 26 (6) ◽  
pp. 411-422
Author(s):  
F. D. Kanellos ◽  
N. D. Hatziargyriou
Keyword(s):  
Wind Turbines ◽  
Distribution System ◽  
Distribution Systems ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Variable Speed ◽  
Voltage Profile ◽  
Asynchronous Machines ◽  
Wind Potential ◽  
Doubly Fed

This paper analyses the repercussions from the connection of Wind Parks on the operation of weak electricity distribution systems, based on simulation results. Three different cases concerning Fixed Speed Wind Turbines are studied. Also Variable Speed Wind Turbines are examined, using (i), doubly-fed induction machines, and (ii), a dual voltage-source converter cascade. All these types of wind turbines are assumed to be equipped with asynchronous machines. The effects on the voltage profile caused by both Fixed and Variable Speed Wind Turbines are compared. The advantages of the variable speed operation are confirmed. The possible increase in the installed capacity of a Wind Park with variable speed turbines, as compared with fixed speed turbines maintaining the same power quality standards, is estimated. The distribution system studied is an actual feeder located in a rural area at the southeast of mainland Greece. This area presents excellent wind potential and as a result independent power producers have expressed a considerable interest for the installation of Wind Parks.

Star/Hexagon Transformer Based Three-Phase Four-Wire DSTATCOM for Power Quality Improvement

2008 ◽  
Vol 9 (6) ◽  
Author(s):  
Bhim Singh ◽  
Jayaprakash Pychadathil ◽  
Dwarkadas Pralhaddas Kothari
Keyword(s):  
Quality Improvement ◽  
Power Quality ◽  
Distribution System ◽  
Distribution Systems ◽  
Reactive Power ◽  
Voltage Regulation ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Three Phase ◽  
Power Quality Improvement

A new topology of DSTATCOM (distribution static compensator) is proposed for power quality improvement in three-phase four-wire distribution systems. A three-leg VSC (Voltage Source Converter) is integrated with a star/hexagon transformer for the compensation of reactive power for voltage regulation or for power factor correction along with load balancing, elimination of harmonics currents and neutral current compensation. The star/hexagon connected transformer provides a path to the zero sequence current in a three-phase four-wire distribution system. In order to optimize the voltage rating of the VSC, the star/hexagon transformer is designed to have a suitable voltage rating for the secondary windings for integrating the three-leg VSC. This transformer connection provides the selection of 'off the shelf' VSC for this application and it also provides isolation for the VSC system. The performance of the proposed DSTATCOM system is validated through simulations using MATLAB software with its Simulink and Power System Block set (PSB) toolboxes.

ENERGY FLOW CONTROL BETWEEN STATIC SERIES COMPENSATOR AND DISTRIBUTION SYSTEMS

2004 ◽  
Vol 13 (04) ◽  
pp. 901-918 ◽  
Author(s):  
HILMY AWAD ◽  
JAN SVENSSON ◽  
MATH H. J. BOLLEN
Keyword(s):  
Distribution System ◽  
Energy Flow ◽  
Distribution Systems ◽  
Electric Energy ◽  
Voltage Source ◽  
Storage Capacitor ◽  
Voltage Source Converter ◽  
Control Techniques ◽  
Design Guide ◽  
Grid Side

By proper control algorithms, the energy flow between the static series compensator (SSC) and the distribution system can be fully controlled. This paper proposes and describes two control techniques to exchange electric energy between the energy storage capacitor (ESC) of the SSC and the utility. The first is based on using a shunt diode rectifier, which is placed either on the load side or the grid side (both configurations are studied). The other exploits the voltage source converter of the SSC to charge its the ESC. A design guide for the dc-capacitor is given. The proposed techniques are validated by PSCAD/EMTDC simulation.

Inductor Saturation Compensation in Three-Phase Three-Wire Voltage-Source Converters via Inverse System Dynamics-I

2020 ◽  
Author(s):  
Ziya Özkan ◽  
Ahmet Masum Hava
Keyword(s):  
Dynamic Model ◽  
Dynamic Performance ◽  
Current Control ◽  
Inverse System ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Two Phase ◽  
Inverse Dynamic ◽  
Three Phase ◽  
Steady State Current

In three-phase three-wire (3P3W) voltage-source converter (VSC) systems, utilization of filter inductors with deep saturation characteristics is often advantageous due to the improved size, cost, and efficiency. However, with the use of conventional synchronous frame current control (CSCC) methods, the inductor saturation results in significant dynamic performance loss and poor steady-state current waveform quality. This paper proposes an inverse dynamic model based compensation (IDMBC) method to overcome these performance issues. Accordingly, a review of inductor saturation and core materials is performed, and the motivation on the use of saturable inductors is clarified. Then, two-phase exact modelling of the 3P3W VSC control system is obtained and the drawbacks of CSCC have been demonstrated analytically. Based on the exact modelling, the inverse system dynamic model of the nonlinear system is obtained and employed such that the nonlinear plant is converted to a fictitious linear inductor system for linear current regulators to perform satisfactorily.

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