Power Systems

The team consists of six members –professor Dr.Sc., two assoc. professors, chief assistant, assistant and a PhD student. The main fields of competence of the team are:

Design of specialized software in the field of electric power engineering;

Calculation and analysis of:

• steady states: voltage levels; advisable tap positions of network transformers; power and energy loss in transmission and distribution networks; advisable reactive power compensation;
• emergency states: short circuits;interruption of phase lines; complex complex types of faults, including in wind and photovoltaic power plants;
• optimal settings of AVR and PSS;
• small-signal stability of electric power systems;
• transient stability of electric power systems;
• robust stability of electric power systems;

Preproject study and design of:

• underground and overhead lines up to 400 kV;
• transformer substations up to 400 kV.

Consultations and trainings in the field of electric power engineering.

Some of the more important projects the team has worked on are:

• Improvement of the frequency control of the Turkish Electric Power System for synchronous operation with UCTE –contractor ESO EAD
• Analysis of the small-signal stability of the new and old part of NPP „Kozloduy” – contractor NPP „Kozloduy”
• Analysis of the power system stabilizers PSS-2A in AES-3C Maritza Iztok 1 EOOD power plant by a detailed mathematical model and proposal of new settings which will damp better the electromechanical oscillations in the generators – contractor AES-3C Maritza Iztok 1 EOOD
• Development of scientific methodology and software tool for determination of the appropriate settings of Automatic Voltage Regulators (AVR) and Power System Stabilizers (PSS), installed in Bulgarian power plants – contractor NEK EAD
• Functionality extension of the software tool NASAVR for calculation of the parameters of AVR and PSS – contractor NEK EAD
• Training of dispatchers from the National and the Territorial Dispatching Centers on the subject „Modern methods for modeling and analysis of electrical power systems transient processes in MATLAB environment“ – contractor ESO EAD
• Representation of wind farm „Sveti Nikola”as equivalent synchronous generator for the purposes of calculation of short circuits – contractor AES GeoEnergy EOOD
• Representation of wind farm „Vetrokom”as equivalent synchronous generator for the purposes of calculation of short circuits
• Representation of PV farm „Samovodene”as equivalent synchronous generator for the purposes of calculation of short circuits
• Analysis of the operating states of the 110 kV network, owned by Mini Maritsa Iztok EAD, and of the supplying generators under conditions of compensation of reactive power – contractor Mini Maritza Iztok EAD
• Study and analysis of the problem with increased reactive power of TRLK Vyrbitza after the change of the commercial metering point and proposition of measures for overcoming the problem – contractor Bulgarian Air Traffic Services Authority
• Analysis of the conditions for automatic power supply backup of substation 223 ­– contractor Neftohim AD
• Analysis of the MV distribution network of NEK EAD, Dobrich region – contractor NEK EAD
• Forecasting and planning of electricity losses in low voltage distribution networks – contractor Energoproekt
• Temporary scheme for power supply of the consumers "Airport Radar", "Condition Main Hall", "Main Control Room" and "Boilers" from 20 kV network and diesel-generator C 1250 – contractor Bulgarian Air Traffic Services Authority
• Calculation of the overvoltage levels and currents for short circuits to ground in substations „Staro Orqhovo” and „Dolen Chiflik” – contractor NEK EAD
• Calculations of short circuits to ground in cable MV distribution network in substation “Shumen-1” and consultations on the methodology of calculation – contractor NEK EAD
• Preparation of expert assessment the state and allowable operating conditions of diesel-generator C 1250 – contractor Bulgarian Air Traffic Services Authority
• Software for automated design of the mechanical part of 20 kV overhead lines – contractor NEK EAD
• Development of a software tool for grid code compliance verification of electric power plants – contractor Siemens SI DG PTI
• Development of a software tool for subsynchronous resonance analysis in electric power systems – contractor Siemens SI DG PTI
• Development of a software tool for power system stabilizer PSS tuning – contractor Siemens SI DG PTI
• Development of a software tool for power system stabilizer PSS tuning – contractor General Electric