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Delegates are invited to meet and discuss with the poster presenters during the poster presentation sessions between 10:30-11:30 and 16:00-17:00 on Thursday, 19 November 2015.

Lead Session Chair:
Stephan Barth, ForWind - Center for Wind Energy Research, Germany
Milena Milinković Faculty of electrical engineering, University of Belgrade, Serbia
Co-authors:
Milena Milinkovic (1) F Zeljko Djurisic (1) Rastko Kostic (2)
(1) Faculty of electrical engineering, University of Belgrade, Belgrade, Serbia (2) Electrical engineering institute Nikola Tesla, Belgrade, Serbia

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Presenter's biography

Biographies are supplied directly by presenters at EWEA 2015 and are published here unedited

Mrs. Milinković has studied electrical power engineering at the University of Belgrade in Belgrade, Serbia. She has obtained her Master’s Degree in Electrical Engineering. After her studies she spent 2 years at Siemens d.o.o. Beograd in Serbia as technical sales and support assistant for medium and low voltage. Also, she is currently PhD student, with PhD thesis focused on renewable energy sources and their integration in distribution networks.


Poster

Poster Download poster (20.19 MB)

Abstract

OPTIMAL VOLTAGE MANAGEMENT OF RADIAL DISTRIBUTION FEEDER WITH CONNECTED WIND POWER PLANT

Introduction

This paper proposes a concept of combined and coordinated voltage management in distribution network with integrated wind power plant. The proposed concept includes the installation of FACTS devices, SSSC (Static Synchronous Series Compensator) type, connected in series at the distribution feeder to which a wind power plant is connected and wind power plant reactive power regulation. Criteria of optimization is to minimize power losses on the radial distribution feeder while keeping a specified voltage profile at the point of connection of a wind power plant.

Approach

This research has developed a new strategy for optimal voltage management of radial distribution network interconnected with wind power plant. Management strategy includes centralized SCADA system for the coordinated control of the SSSC`s series reactance and reactive power generation/absorption of wind power plant in order to minimize power losses of the radial feeder while keeping a specified voltage profile. The proposed system provides better effects of wind power plant integration into the distribution network in relation to the existing voltage management strategies. These existing strategies are based on the reactive power control of wind power plant and installation of shunt FACTS systems, such as SVC devices.

Main body of abstract

Due to intermittent production of wind power plants problem of voltage fluctuations is often a limitation in terms of installed capacity of wind power plants. It is necessary to perform dynamic voltage control in the distribution network so the technical regulations regarding the voltage variations can be met. The voltage fluctuations are especially present in weak distribution networks which are interconnected with large WTG units.
Voltage control is possible to a certain level through the reactive power control of the wind power plant. However, this approach is limited because of: regulation capabilities of wind power plant, the problem of increased power losses and the overload of the distribution feeders. Voltage control only through the optimization of reactive power generation/absorption of the wind power plant is significantly reduced in weak distribution networks due to unfavourable resistance and reactance ratio of the feeders in these networks.
The basic idea is that the new system for voltage regulation which includes both the management of the series reactance on the distribution feeder and the control of reactive power generation/absorption of wind power plant..
Management of the equivalent reactance can be achieved by installing series FACTS device, SSSC type, at the point of the wind power plant connection. This flexible device actually represents a concentrated series reactance which is superimposed to the feeder impedance. This paper also presents a mathematical model which calculates optimal reactance of the SSSC device and the reactive power of the wind power plant for each operating mode. The criterion of optimization is to minimize power losses of the radial distribution feeder while keeping a specified voltage profile at point of wind power plant connection.
The proposed concept of voltage management is tested on the distribution feeder in Serbia, to which the connection of wind power plant is planned. Analyzes indicate the practical applicability of the proposed concept of voltage control.


Conclusion

Coordinated voltage control at the terminals of SSSC devices and injected reactive power control of wind power plant provides a possibility to manage voltage at the point of connection of the wind power plant, while minimizing the power losses of the supply line. The simulation performed in this paper have shown that the proposed system efficiently manages the voltage at the point of wind power plant connection with a significant reduction in power losses.


Learning objectives
This paper illustrates that the application of the proposed concept of a coordinated voltage management is cost-effective and: provides significant reduction of power losses in the distribution network, improves voltage conditions, increases capacity of distribution feeders for hosting distribution generation and ensures better voltage stability in the active distribution network.