Electric-power equipment and power electronics

Head of lab Zaitev Dmitrii, PhD
asd

1. Field of scientific researches

Laboratory researches are aimed to development and modelling of efficient installations used for controlling of power system functioning mode (PSI – phase shift installation), to elaboration of development scenarios, both transport electric networks, and new generation capacities for creation of conditions of parallel work with the neighbours power systems.
At the same time, laboratory researches are directed to working out of management laws by power keys in order to provide quick selection of necessary functioning mode of PSI. The researches aimed to development of efficient technical solutions on conversion of renewable energy sources, to development of voltage and current convertors are provided too.

2. Laboratory team: 4 PhD, 2.s.r., 4 engineers

asdCurrently, team of laboratory consists of 10 members, including 4 PhD (Zaitev Dmitrii, Calinin Lev, Tirsu Mihai, Petrova Olga), 2 scientific researchers (Uzun Mihail, Kapralov Anatolii) and 4 engineers. In particular, in number of the basic employees having the large experience of work in the field of working out of new technical solutions of FACTS controllers, and also their management, enter:

3. History of EEPE laboratory

EEPE laboratory has been created in 2010 as a result of structure optimisation of Institute of Power Engineering on the basis of Electrophysics and High Voltage Technique laboratory, created in 1982, according to AS MSSR Presidium decision, as a part of Department of AS MSSR power cybernetics, on which basis in 1991 the Institute of Power Engineering of Academy of Sciences of Moldova has been created. Till 1991 the laboratory was called “High-voltage test laboratory”. During the period since 1982 on 1991 supervisor of laboratory was PhD V.L.Ivanov, during 1991 till 1996 – dr. O.V.Grimalsky, since 1996 till 2004 – dr.A.M.Bologa, since September, 2004 till 2010 - PhD M.S.Tirsu, since 2010 till now – PhD Zaitev Dmitrii.
Carrying out of a complex of high-voltage researches of natural models and insulation of transmission lines of new type was the basic direction of researches till 1991; carrying out of tests of electrophysical characteristics of insulation constructions.
In this direction works on elaboration of computation method of a quasistationary flat electromagnetic field and impedances matrix in lingering systems were spent.
The laboratory among the first dealt with problems of definition of electric durability characteristics and specific superficial conductivity of the overhead line 110-330kV insulator set polluted while in service which has been removed with various sites of lines passing on territory of Moldova at the basic electric influences (storm and overvoltage switching  at frequency 50Hz).
Rapid development of controlled transmission lines of the raised capacity was accompanied during that period by necessity of installation between the pull together phases in overhead span of fixing insulation brace which exclude possibility of wires nonsynchronous swing and them swinging cross. In this direction the laboratory conducted works on research of characteristics of electric durability of compound insulators of interphase constructions, on choice the basic dimensions and interphase insulation elements for controlled self-compensated overhead line.
Since 90th year use scale in industrial and an agricultural production of the charged aerosols - disperse systems with the liquid or firm phase bearing a superfluous electric charge has steadily started to grow. In this direction the laboratory conducted researches of more than 10 years. The collective of laboratory had been developed in 1990 a pneumatic electrostatic spray which provided effective liquids dispersion at enough its considerable expenses (to hundreds kgs at an o'clock).
In 1991 according to Decision of AS MSSR Presidium about acceptance of "Concept of MSSR Academy of Sciences development” and new structure of Academy, the department of power cybernetics has been reorganised in Institute of Power Engineering. With a view of perfection of structure, increase of efficiency of power systems and systems of electrosupply, expansion of fundamental and applied researches in the field of power the laboratory has been renamed in Laboratory of Electrophysics and technique of high voltage.
Working out of theoretical bases of modelling of electromagnetic fields of electropower objects and electrophysical devices, research of influence of electromagnetic fields on process liquids dispersion for power installations became the basic directions of research.
The laboratory carried out researches of possible directions of practical application of the charged aerosols in the industry, agriculture, power, medicine. Developed ways of dispersion and charging of liquids, and also new advanced designs of electrostatic sprays.
Researches on reception of experimental data about a capacitive coupling between phases, and also separate wires of self-compensated overhead line (SCOL) 110kV are in parallel carried out. Technical solutions are developed for creation of high-voltage lines of new type of the raised capacity. For the first time experimental sites of SCOL on the basis of typical one-chain support overhead line -750kV are developed and built.
Since 2004 the laboratory conducts researches in direction of working out and modelling of FACTS controllers intended for management of active and reactive power flows in transport networks of electric systems. A certain experience in this field possesses employees of laboratory PhD Calinin L.P. and PhD Zaitev D.A. which are engaged in designing and working out of FACTS controllers.
Since 2010 the laboratory carries out researches on working out and modelling of effective installations of management by a power system operating mode, on working out of scenarios of development, both transport electric networks, and new capacities of generating for the purpose of creation of conditions for parallel work with the neighbours power systems, on working out of laws of fast management by a functioning mode of PSI, on working out of effective technical solutions of renewed energy sources conversion, on working out of converters of voltage and current.
The number of employees of laboratory in various years included known experts in Moldova in the field of the high-voltage equipment - PhD V.L.Ivanov, dr.sc. O.V.Grimalsky, dr.sc. A.M.Bologa, PhD Mashtakov, PhD M.Burlaku, PhD L.P.Calinin, PhD D.A.Zaitev and a number of other employees.

4. Main scientific results (1994 – 2010)

Effective technical solutions of realisation of phase shift installations have been developed which possess a number of advantages in comparison with the existing: the lowered cost price on 20 %, the lowered installed capacity on 25 %, the lowered factor of weight and dimension, a small step of phase shift regulation (7 steps of phase shift regulation), and also is developed electronic system of phase shift regulation which has the lowered installed capacity on 33 % in comparison with traditional.
Laws of management by IPC modes which ensure set parameters of power system are developed. Calculations of perspective modes of power system of Moldova in the conditions of development of new electric connections with the neighbour power systems are executed, using FACTS - controllers of IPC type. Recommendations about decrease in capital expenses for modernisation of high-voltage transport lines (110-330) kV and on maintenance of distribution of electric energy flows in the necessary directions by means of introduction of FACTS controllers, and also the recommendation about modernisation of distributive and transport networks are developed to lower electric power losses approximately on 10 %.
Distributions of power flows in transport networks of a power system of Republic Moldova have been calculated at installation of FACTS controllers of different types in splitting of interconnection line of 400kV with power system of Romania.

5. Main practical developments

Laboratory sample of PSI on 380V for experimental check of solution correctness on realisation of a parametrical regulator with advanced technical parameters is developed and realised. The new design of the device provides decrease on 25 % of the installed capacity of the consecutive transformer at the same adjusting characteristics and decrease in own losses in installations more than on 20 % in comparison with a prototype.

asdA number of voltage converters, alternating voltage stabilizers, controllers of batteries charge of storage from photovoltaic cells, from wind installations, from network which possess many advantages in comparison with widely used have been developed and realized.

 

asdElectrostatic sprays of a liquid which allows raising efficiency of products and objects processing, to lower the expense of materials, to save time and efforts, to improve ecological conditions, to reach desirable effect, using new effective technologies. It allows effectively process agricultural plants in the conditions of the open and closed ground, decrease expenses of sprayed chemicals and their pulling down by wind, reduction of pollution level of soil and reservoirs by chemicals, to increase sedimentation degree by plants from 2 to 7 times. In regular intervals to process the top and bottom parts of leaves. Effectively influence wreckers and illnesses of plants.

6. Laboratory priority

In 2004 - 2010 have been received a number of patents from AGEPI, Moldova which confirm leader position of laboratory team in this area of research:
1. Instalaţie de reglare a unghiului de fază dirijată cu chei electronice de putere/Установка для регулирования фазового сдвига управляемая электронными силовыми ключами/Phase shift installation controlled by power electronic keys. 2652 MD, CALININ Lev, ZAIŢEV Dumitru, BERZAN Vladimir, TÎRŞU Mihai.
2. Instalaţie de reglare a decalajului de fază cu două transformatoare/Фазосдвигающая установка с двумя трансформаторами/Phase shift installation with two transformers. 3823MD. CALININ Lev, ZAIŢEV Dumitru, BERZAN Vladimir, TÎRŞU Mihai.
3. Instalaţie reversibilă de reglare a fazelor/Реверсивная установка для регулирования фазового сдвига/ Reversible phase shift  installation. 2824MD. L.Kalinin, D.Zaiţev,  E.Iaroşenco, A.Sizov.
4. Stabilizator de tensiune a generatorului asincron cu turaţie mică/Стабилизатор напряжения асинхронного генератора с малыми оборотами/Voltage stabilizer of asynchronous generator with small rotation. 3607MD. BERZAN Vladimir, TÎRŞU Mihai.
5. Dispozitiv pentru producerea energiei electrice al instalaţiei eoliene/Устройство для производства электрической энергии от ветреной установки/Device for electrical energy production from wind installation. 4028MD. BERZAN Vladimir, ANISIMOV Vladimir, TÎRŞU Mihai, UZUN Mihail, SCOBIOLA Victor.
6. Instalaţie eoliană de uscare/Ветровая установка для сушки/Drying wind installation. 3783MD. BERZAN Vladimir, ANISIMOV Vladimir, TÎRŞU Mihai, CONSTANTINOV Nicolai.
7. Motor eolian cu roată eoliană de diametru mare/Ветродвигатель с ветроколесом большого диаметра/Wind turbine with large diameter of windwheel. 43MD. BERZAN Vladimir, ANISIMOV Vladimir, BÂRLĂDEANU Alexandru, TÎRŞU Mihai.

 At the same time, the most part of the received results has been noted with gold, silver and bronze medals on salons the international exhibitions as: Salon of international exhibitions GENEVA, the International exhibition of inventions, scientific researches and new technologies „INVENTICA, Salon of inventions EUREKA, Brussels, the International exhibition„ The Belgian and International Trade Fair for Technological Innovation ”. Brussels, etc.

7. Approbation of results

Results of scientific researches executed by laboratory during 2005-2010 have been presented and reported on more than 45 international conferences and symposiums.

8. Publication of research results

By employees of laboratory only for last 5 years (2005-2010) have been published more than 75 works, including 39 in foreign reviewed magazines.

9. Main publications

10. Contacts

Address:
Institute of Power Engineering of ASM,
EEPE Laboratory,
5, Academiei str., Chisinau, MD-2028,
Republic of Moldova
Tel. (373-22) 73-81-24. (373-22) 73-53-84.
Fax. (373-22) 73-53-82
e-mail: zaiats@ie.asm.md
            tirsu.mihai@gmail.com