Rad Stanev

Technical University of Sofia | TU · Department of Electrical Power Engineering

PREPARED BY The Power and Energy Education Committee University Education Activities Subcommittee Task Force on Innovative Teaching Methods for Modern Power and Energy Systems PES-TR120 TR-120 — Innovative Teaching Methods for Modern Power and Energy Systems https://resourcecenter.ieee-pes.org/publications/technical-reports/pes_tp_tr120_peec_03...

The dependability of the power infrastructure is ensured by established testing practices. However, these practices do not address new stability phenomena or issues arising from cyber-physical interactions through increasingly digitalized control technologies. With the above-described challenges and developments, the complexity of test planning and...

This paper proposes an efficient and dynamic process to evaluate the smart grid research and innovation (R&I) activities in the EU Member States (MS) at the national level where the R&I status of smart grid technologies is identified by analysing the outcomes of completed projects and R&I priorities are extracted from the national energy and climat...

The success of the energy transition in Europe depends on the engagement of citizens and the sustainable replacement of conventional generation with renewable production. Highlights of the PAN European Technology Energy Research Approach (PANTERA) project, a H2020 coordination and support action, are presented in this paper. In broad terms, PANTERA...

Forecasting is a special scientific study, the subject of which is the perspective for the development of the phenomenon. It is of great importance for many scientific and applied fields. This article presents a stochastic model for microgrid load forecasting. Statistical and stochastic methods are used for forecasting.

In this article, a stochastic model for prediction of microgrid photovoltaic power generation, using statistical and stochastic methods is presented. The study is performed in the following steps: Processing of a large database of historical data (Data Mining); Construction of a stochastic forecasting model; Reporting a symmetric mean absolute perc...

The work in this report is carried out under the Work Package three (WP3) ‘The state of R&I (Research and Innovation), standardisation and regulation’ of the Pan European Technology Energy Research Approach (PANTERA) project. This deliverable aims at reviewing Regulations, Codes and Standards (RCS) in the Smart Grid domain that will form valuable c...

This document provides a review of EU strategic priorities and policy developments structured into two dimensions: the dimension of the legislative process and the dimension of the policies themselves. The dimension of the legislative process addresses the process of legislation co-creation and social acceptance from stakeholder perspective. The di...

Analysing the intensity of research activity in smart grid related projects being carried out in the EU Member States (MS) is one of the key processes to identify the future steps necessary for a responsible energy transition. So, within this paper, a brief review is performed on the two project evaluation methodologies that are well practiced in t...

One of the key outcomes of PANTERA is to identify the current status of the EU member states (MS) with the low R&I activities in the field of smart grid, storage and local energy systems. Along with this, PANTERA is analysing the needs for future R&I priorities to achieve the decarbonised European smart grid network in a harmonised way (to meet the...

The integration of smart grid technologies in interconnected power system networks presents multiple challenges for the power industry and the scientific community. To address these challenges, researchers are creating new methods for the validation of: control, interoperability, reliability of Internet of Things systems, distributed energy resourc...

This article presents a concept and architecture of interconnected laboratories for stability studies of future power systems. Based on the knowledge and infrastructure base of the existing power system stability laboratories in TU-Sofia and TU-Varna, the potential for forming a geographically spread joint research infrastructure is estimated. The...

The human kind slowly, yet steadily, moves toward preserving the environment and planet Earth. One of the solutions is to increase the energy efficiency in the households and industry. However, there is a major obstacle – gathering and burning fossil fuels. One of the tools to break the conventional power generation model is to shift towards decent...

This paper presents energy flows management of multiple electric vehicles charging and its impact on a microgrid. The studied low voltage grid comprises also two photovoltaic generators and non-dispatchable loads. Three concepts using electric vehicles batteries as a distributed storage and bidirectional energy transfer in the Smart Grid are consid...

This paper describes a new physical model for micro-, mini- and nanogrid research and testing, which has been developed and realized at the Power System Stability Laboratory (PSSL) of the Technical University of Sofia. Created to be flexible, the model allows for an investigation of various configurations and schemes performed in different test sce...

While the number of the vehicle actuated with liquid fuels are settled, the count of electric vehicles is increasing. For the present moment most of them are scheduled for daily urban usage. This paper presents an analytical approach for estimation of the impact of electrical vehicle (EV) battery charging on the distribution grid. Based on the EV c...

Теми за дипломни работи с ръководител Рад Станев 2017/2018 г.

This article presents an approach for flexible loads control in power systems with integration of electric vehicles (EV) and distributed generation for power system regulation. A control system with monitoring and control capabilities is proposed as a possible solution of the main problematic issues related to EV charging. IEC61850 standard is cove...

This article presents smart load management concept which enables improved usage of the energy provided by the distributed generators (DG) present in comprehensive nanogrids. The analysis shows that significant part of the energy generated in the present nanogrids is lost due to limited or absent distribution networks and/or storage capacities. A n...

This article presents a novel electricity market model for smart grids with electric vehicles (EV), Distributed Energy Resources (DER), Storage Devices and flexible loads. Taking into account the main drawbacks of the existing solutions a novel dynamic pricing electricity market model based on the network state parameters is proposed as a promising...

This article presents a novel control concept, operation paradigm and electricity market model for distribution networks with electric vehicles (EV) and Distributed Energy Resources (DER). An analysis of the presently existing control strategies, market models and EV characteristics is made. Taking into account the main drawbacks of the existing so...

This article presents a new design, scheme and realization of physical model of hydroelectric unit for transient processes and power system stability studies. A comparative analysis of the existing approaches for modeling of turbine generator units in hydraulic power plants (HPP) is performed. А new approach and solution which enable estimation of...

Within this work, rules and procedures for modeling DER components in simulation environments in an implementation independent representation based on the CRM specification are proposed. In addition, some reference implementations are presented which are validated by comparing simulation results in different platforms.

This paper presents a concept and a realization of smart load controller of dispatchable (flexible) loads, supporting the active power balance in smart microgrids and electrical power systems.

This article presents concept, strategy and realization of primary power control for small hydraulic generators operating in autonomous, micro and minigrids. Based on field measurements and software simulations analysis on the current state of the art control strategies is made. A new improved active power control strategy is presented as suitable...

The IEC 60214-1:2003 standard describes several type tests for tap-changers and drive units. Although these tests are quite enough, some of them are not described properly or with the sufficient details. In some other cases acceptance criteria might not guarantee proper operation of the tested apparatus. The standard does not take into consideratio...

This article presents an estimation of the impact of distributed energy resources (DER) on the electrical network power losses. Using novel quasi-dynamic analytical approach the contribution of the distributed generation (DG) to the network power losses is estimated. Slow dynamics simulations are performed on differently controlled DG in order to c...

This article presents a dual leading signal control concept for smart active power management of microgrids and autonomous power systems. The main principles and distributed control behaviour of all of the microgrid players-generation, load and storage devices are derived and presented. КОНЦЕПЦИЯ ЗА ИНТЕЛИГЕНТНО УПРАВЛЕНИЕ НА МОЩНОСТИТЕ В МИКРОМРЕЖ...

This article presents mathematical models of the elements of microgrids and autonomous power systems with storage devices. A special attention is payed to the energy storage devices' modeling. A verification and accuracy analysis using comparison between model simulations and state parameters measurements of existing is presented.

This article presents a fast and computationally efficient analytical approach for estimation of the impact of electrical vehicle (EV) charging devices on the distribution networks using quasi-dynamic long-term simulations. Based on the time varying electrical parameters of the EV charging devices, loads and local distributed generation in each nod...

This paper presents the concepts and the implementation of a quasi-dynamic approach for slow dynamics time domain analysis of electrical networks with distributed energy resources (DER). The approach presented shows fast and computationally effective performance for time domain analysis of multi node networks with distributed generation.

This report proposes a methodology for estimation of the effects of distributed generation (DG) on the distribution network under normal steady-state operation conditions. Taking into account the characteristics of the generation units and the characteristics of the electrical network a multiple power flow analysis is presented to be suitable for i...

This article presents the examination of distribution networks using the program for voltage stability static analysis STATUS. An example with a real network is examined. On the basis of static analysis the sensitive and predisposed to instability points and other “weak” places of the network are localized and measures for stability increase, optim...

Изясняват се причините за възникването на лавина на напрежението в електроенергийната система, начина на протичането и последствията. Използуват се метода на V-Q чувствителностите и модалния анализ за анализиране на този процес. Дават се резултатите от изпитването на програмна реализация върху тривъзлова мрежа.