RUS  UKR

Alexey Baydak

Faculty: Electrical Engineering

Speciality: Electrical Systems and Networks

Theme of master's work:

"Research methods for power flow conrol between networks of different nominal voltages of the electrical systems"

Scientific adviser: Ivan Zabolotnyi

Materials on the theme of master's work:

• About author

Summary of master`s work

Introduction

Energetics is one of the main areas of social production and plays a leading role in the existence and development of the national economy. As energy production region has a number of features that determine the requirements for the management of electric power systems (EPS). An important task of regulating the electrical system is ensuring a balance of generated and consumed power at a specified quality of electrical energy [1].

At the present stage of its development analysis of the electric power problems allows to mention the following factors that affect the reliability of power supply:

1. Increasing risk of ensuring of EPS regimes in terms of the energy market necessitates a decision in the growing number of scheme-operating situations. Management systems that were previously used in the vertically integrated companies are insufficient to effectively manage under new conditions.
2. The availability of modern technologies, which allow to develop and create a management systems for solving various technological tasks of EPS operating on a qualitatively new level.

Subject urgency

The concept of parallel operation of EPS is dominant in the world therefore the energy strategy of Ukraine for the period until 2030 envisages a number of measures to ensure the parallel operation of united power system (UPS) of Ukraine with energy associations in Europe.

In solutions of energy companies in several countries is stressed that the urgent problems of operating in the energy market are:

• insufficient capacity of transmission lines that provide communication between the individual EPS, and inside EPS, which limits the ability to meet the requirements of a free electricity market under the terms of reliable energy supply;
• low regime controllability of electrical networks, insufficient volume of voltage and reactive power devices control;
• non-optimal distribution of power flows on parallel transmission lines of different voltage class, and as a result – the throughput constraint of electrical networks, the increase of power losses and energy, increased transmission costs.

These factors determine the requirements for management systems to ensure the necessary level of reliability of the UPS in many countries, including Ukraine.

The primary goals of management regimes are:

• voltage regulation in networks;
• ensuring the sustainability of the energy system under different perturbations;
• increasing the capacity of transmission lines, up to a limit of the heating;
• ensuring the quality of electricity;
• ensuring of the set (forced distribution) power in electrical networks in accordance with the requirements of the controller [2].

The existing devices SVC and the CSC solve these problems not fully and not always optimal. The main drawback of existing devices is the realization of the principle of scalar control and a relatively low response speed.

Flexible AC Transmission Systems (FACTS) allows to eliminate the shortcomings of traditional devices and to provide a new level of power flow management in electrical networks in normal and transient modes of operation in the EPS.

FACTS – a transmission line equipped with modern power electronics with microprocessor control system. FACTS is transforms the function of electrical network from "passive" to "active" passive transmission lines. The technology of flexible lines is based on the use of vector control [3].

Foreign experience of using FACTS allows concluding that there are problems associated with the need of account for the mutual influence of individual devices FACTS and integrating them into the emergency automation. Location and type selection of FACTS also depends on the specific features of the electrical system.

Connection with scientific themes, plans and programs

Theme of work is defined by one of the areas of scientific work conducted at the department "Electrical Systems" of state higher education institution "Donetsk National Technical University".

The purpose and objectives of development and research

Objective

The aim of work is improvement of methods and models of power flow management in closed electric circuits.

The idea of work

The idea of work is to eliminate inconsistencies between the existing methods of managing the power flow in a closed electrical network using devices that implement the FACTS technology.

The primary goals of development and research

To achieve formulated aim it is stipulated to solve following problems in the work:

1. Analysis of "bottlenecks" in the Donbass EPS in ensuring controllability regimes.
2. Substantiation of possible directions of the decision of problems which are defined on the basis of the spent analysis.
3. Development of methods and models for substantiation: necessities of use, definition of the location and FACTS type device; working out of algorithms of management by modes of electric networks and modeling of EPS modes taking into account devices.

Subject of development and researches

Subject of research are electric systems with FACTS devices.

Object of development and researches.

Object of research of master's work is operating modes of electric system.

Methodology and research methods

For the decision of tasks in view were used: methods of mathematical modeling, the numerical decision of the nonlinear algebraic and differential equations for calculations of the established and transitive operating modes of electric systems.

Scientific novelty

Scientific novelty consists in improvement of methods and models of management of modes of electric systems at introduction of technology of flexible lines.

Scientific novelty of work is made by following results and positions:

• improved mathematical model of unified FACTS device that allows to define sensitivity of operating mode of object to device type (functional efficiency);
• improved method of definition of installation site of the device on the basis of association of methods of estimations of heterogeneity of network and influence of indignations in knots on streams of capacities in the branches offered in works of Vinnitsa National Technical University.

Practical value of expected results

During the master's work performance it is planned to receive following results:

1. Developing the algorithm for revealing of degree of EPS heterogeneity and its program realization.
2. Revealing of the "bottlenecks" connected with limited possibilities of parallel EPS work on the basis of the developed software.
3. Estimation of efficiency of installation of various FACTS devices in Donbass EPS.

Work approbation

Some positions of necessarily introductions and uses of FACTS devices in EPS have been considered on XV Ukrainian student's scientific and technical conference «Electrotechnical and electromechanical systems» (Sevastopol, SevNTU – 2010).

Scheme 1 – Equivalent circuits of basic FACTS devices: STATCOM, SSSC and UPFC.

(Animation: volume – 81,4 kB; number of frames – 9; frame latency – 0,8 seconds; amount of repeated cycles – 5)

List of used literature

1. Идельчик В.И. Электрические системы и сети: Учебник для вузов./ В. И. Идельчик – М.: Энергоатомиздат, 1989 – 592 с.
2. Павловский В. В. Аналіз та методи управління режимами електричних систем з гнучкими передачами змінним струмом. Автореферат диссертации. / В. В. Павловский – К.: Институт электродинамики НАН Украины, 2010 – 36 с.
3. Ситников В. Ф. Совершенствование методов и средств управления режимами электроэнергетических систем на основе элементов гибких электропередач (FACTS). Автореферат диссертации. / В. Ф. Ситников – Иваново. Ивановский ГЭУ, 2009 – 34 с.
4. Кулик В. В. Розробка засобів аналізу і компенсації впливу неоднорідності електроенергетичної системи на оптимальність її режимів. Автореферат диссертации. / В. В. Кулик – Винница, ВГТУ, 2001 – 18 с.
5. Лежнюк П. Д., Кулик В. В. Оптимальне керування потоками потужності і напругою в неоднорідних електричних мережах. Монография. / П. Д. Лежнюк , В. В. Кулик – Винница, ВГТУ, 2001 – 188 с.
6. Лежнюк П. Д. Зменшення неоднорідності ЕЕС з урахуванням параметричної чутливості. // П. Д. Лежнюк, Е. А. Карпов, Н. В. Остра – Вестник ВПИ, 2004, №6 – стр. 43-47.
7. Стогний Б.С. Підвищення пропускної здатності «слабких» перетинів енергосистем з використанням технології гнучкої передачі змінним струмом (ГПЗС, FACTS) // Б.С. Стогний, О.В. Кириленко, В.В. Павловский, А.В. Левконюк – Техн. електродинаміка. 2009, N 2. – стр. 63-68.
8. Буткевич А. Ф. Запаси статичної стійкості та пропускна спроможність контрольованих перетинів енергосистем – деякі ретроспекції та сьогодення. // А. Ф. Буткевич – Сборник научных работ института электродинамики НАН Украины. №18, 2007 – стр. 3-12.
9. Ольшванг М.В. Извлечение избыточной энергии из развитой высоковольтной сети: способ, средства и технология // М.В. Ольшванг – «Электротехника 2010 год», N 1.18, Москва, ВЭИ. 1999.
10. Методика оценки технико-экономической эффективности применения устройств FACTS в ЕНЭС России / Открытое акционерное общество «Научно-технический центр электроэнергетики», Открытое акционерное общество «Проектно-изыскательский и научно-исследовательский институт по проектированию энергетических систем и электрических сетей». – М. «Приложение к распоряжению ОАО «ФСК ЕЭС» от 22.01.2009 № 22р», 2009 – 31 с.
11. Беляков Ю.С. Расчет режимов электрических систем, представленных многополюсниками. / Ю.С. Беляков – М.: «Спутник», 2008 – 125 с.
12. Закарюкин В. П., Крюков А. В. Сложносимметричные режимы электрических систем. / В. П. Закарюкин, А. В. Крюков – Иркутск, ИГУ, 2005 – 274 с.

At writing of the abstract master's work isn't finished yet. The definitive variant of work can be received at the author or the scientific adviser after December, 2010.

DonNTU     Master's portal