Srete Nikolovski

EPIK d.o.o

Wireless sensor network (WSN) refers to the network formed by sensor nodes for communicating sensed data over the wireless medium. These sensor nodes are mostly deployed randomly in the target area, and hence estimating the coordinates of these sensor nodes through the localization process is an important activity. Majority of the localization algo...

The safety of workers and equipment in the power grid requires the shutdown of power plants in case of maintenance or malfunction. The shutdown relies on protective devices that must be properly coordinated to isolate only the part of the grid affected by the malfunction. Using the DIgSILENT PowerFactory software, an analysis was conducted on a mod...

Sve dostupnija osobna računala (PC) te porast njihove procesorske moći (oko 2 puta svakih 18 mjeseci – zakonitost koju je zapazio Gordon Moore davne 1965. godine) otvorila su vrata uporabi osobnih računala u gotovo svim područjima elektrotehnike, pa tako i elektroenergetike. Iako je cijena osobnih računala s obzirom na procesorsku moć u stalnom pad...

In the current energy usage scenario, the demands on energy load and the tariffs on the usage of electricity are two main areas that require a lot of attention. Energy forecasting is an ideal solution that would help us to better understand future needs and formulate solutions accordingly. Some important factors to investigate are the quantity and...

This article presents a brushless DC motor drive using a solar photovoltaic (PV) array and grid. Solar PV array-fed drive systems typically need a DC-DC converter stage in order to optimize the solar PV array-generated power utilizing a maximum power point (MPP) tracking technique. In this work, a boost DC-DC converter is used for MPP tracking purp...

This article presents a brushless DC motor (BLDCM) drive for a maritime electric vehicle (MEV) application. The presented BLDCM drive uses a bridgeless Cuk-buckboost (BL-Cuk-BB) converter for input-side power factor (PF) improvement. The BL-Cuk-BB converter uses the buckboost converter for the negative half-cycles of the input AC voltages and the C...

In micro-grids (MGs), renewable energy resources (RESs) supply a major portion of the consumer demand. The intermittent nature of these RESs and the stochastic characteristics of the loads cause a frequency stabilization issue in MGs. Owing to this, in the present manuscript, the authors try to uncover the frequency stabilization/regulation issue (...

The article elaborates on the accuracy of current transformers (CT) in interaction with temperature and frequency using Pearson’s correlation. The first part of the analysis compares the accuracy of the mathematical model of the current transformer and the result of the measurement on the real CT using the Pearson correlation calculation. The mathe...

We have analyzed 127 publications for this review paper, which discuss applications of Reinforcement Learning (RL) in marketing, robotics, gaming, automated cars, natural language processing (NLP), internet of things security, recommendation systems, finance, and energy management. The optimization of energy use is critical in today’s environment....

Frequency, tie-line power, and the terminal voltages of synchronized generators must all be kept within prescribed limits to ensure the stability of an interconnected power grid through combined automatic generation control (AGC) and automatic voltage regulator (AVR) loops. Thermal power plants, electric vehicles, and renewable energy sources—inclu...

This paper proposes a step-up 3-Ф switched-capacitor multilevel inverter topology with minimal switch count and voltage stresses. The proposed topology is designed to provide five distinct output voltage levels from a single isolated dc source, making it suitable for medium and low-voltage applications. Each leg of the proposed topology contains fo...

As information technology advances quickly, so does the 5G–6G network management system, which is moving toward greater integration, decentralization, diversity, and intelligence. As flexibility is a crucial criterion for 5G–6G network architecture, we use the Software Defined Network (SDN) paradigm to make the programmability more flexible. Due to...

An interconnected power system requires specific restrictions to be maintained for frequency, tie-line power, and the terminal voltage of synchronized generators to avoid instability. Therefore, frequency stability and voltage regulation issues are covered individually and jointly in the current research work. Initially in test system 1, automatic...

In a smart city environment, with increased demand for energy efficiency, information exchange and communication through wireless sensor networks (WSNs) plays an important role. In WSNs, the sensors are usually operating in clusters, and they are allowed to restructure for effective communication over a large area and for a long time. In this scena...

The use of electric vehicles (EVs) has recently increased in a smart city environment. With this, the optimal location of the charging station is a great challenge and, hence, the energy efficiency performance (EEP) of an electrical system is important. Ideally, the EEP is realized through passive energy boosters (PEBs) and active energy boosters (...

n this paper, battery electric vehicle (BEV) controllers are smartly tuned with particle swarm optimization (PSO) and genetic algorithm (GA) to ensure good speed regulation. Intelligent tuning is ensured with a proposed and well-defined cost function that aims to satisfy the design requirements in terms of minimum overshoot, fast response, and tole...

In this paper, battery electric vehicle (BEV) controllers are smartly tuned with particle swarm optimization (PSO) and genetic algorithm (GA) to ensure good speed regulation. Intelligent tuning is ensured with a proposed and well-defined cost function that aims to satisfy the design requirements in terms of minimum overshoot, fast response, and tol...

Steady increase in electricity consumption, fossil fuel depletion, higher erection times of conventional plants, etc., are encouraging the use of more and more onsite renewable energy. However, due to the dynamic changes in environmental factors as well as the customer load, renewable energy generation is facing issues with reliability and quality...

The paper presents a new model of the thermal rotor protection 49R on synchronous generators with self-excitation with the influence of generator negative sequence protection 46I2. The purpose of the analysis is to solve the problem of simultaneous occurrence of rotor overload due to excitation current and rotor overload due to the inverse componen...

This study presents the implementation of Artificial Bee Colony (ABC) optimization in an island hybrid power system model using fuzzy logic-based load frequency control. The Island Hybrid Power System considered in this study consisted of various generation units and an energy storage system. The optimized control parameters of PID using ABC were u...

This paper presents a new approach for the coordinated design of a power system stabilizer- (PSS-) and static VAR compensator- (SVC-) based stabilizer. For this purpose, the design problem is considered as an optimization problem, while the decision variables are the controllers’ parameters. This paper proposes an effective optimization algorithm b...

Voltage sag is one of the most significant power quality problems in the industry and has a significant impact on induction motor safety and stability. This paper analyzes the characteristics of voltage dips in power systems and induction motors with a special emphasis on balanced dips with the help of virtual grids (regenerative grid simulator), a...

The dependability of power electronics systems, such as three-phase inverters, is critical in a variety of applications. Different types of failures that occur in an inverter circuit might affect system operation and raise the entire cost of the manufacturing process. As a result, detecting and identifying inverter problems for such devices is crit...

The dependability of power electronics systems, such as three-phase inverters, is critical in a variety of applications. Different types of failures that occur in an inverter circuit might affect system operation and raise the entire cost of the manufacturing process. As a result, detecting and identifying inverter problems for such devices is crit...

SAŽETAK U članku se razmatra svrha izgradnje visokonaponskog istrosmjernog (HVDC) postrojenja te njegova ekonomska isplativost. Također su prikazani trendovi prema tipovima i proizvođačima u svijetu te posebno u Europi. Uspoređuju se dva prevladavajuća tipa IGBT i tiristorski model sa prednostima i nedostacima jednih i drugih. Daje se primjer iz pr...

Abstract: Resilience is defined as the ability of the power system to maintain a desirable level of performance against severe turbulence and restore over an appropriate period of time. Adverse weather conditions and natural disasters have always led to intensive damage and extensive outages at the distribution network level. The number and severit...

Part 1: IoE for Energy Resources. 1. 5G, Communication Protocols and Innovations in IoE 2. IoE for Conventional Energy Sources 3. IoE for Wind Power Generation 4. IoE for Solar Power Generation 5. IoE for Combined Heat and Gas Power Generation 6. IoE in Distribution Generation 7. IoE for Microgrid and Smart Grid Systems 8. IoE for Cogeneration Part...

Direct current microgrids are attaining attractiveness due to their simpler configuration and high-energy efficiency. Power transmission losses are also reduced since distributed energy resources (DERs) are located near the load. DERs such as solar panels and fuel cells produce the DC supply; hence, the system is more stable and reliable. DC microg...

The role of renewable energy sources in the power grid is tremendously increasing. However, power electronic converters are used to incorporate RES into the grid without inertia. This arti-cle recommends an improved emulated inertia control approach focused on the frequency devi-ation and rate of change of frequency to enhance the inertia of a powe...

Fuzzy logic provides an appropriate way to incorporate an individual’s knowledge into expert systems using descriptive language expressions. A large number of commercially successful applications in power energy systems show that fuzzy logic can be used very successfully, especially during disturbances. During a disturbance, automation of system fa...

This paper outlines research conducted using bilinear time-frequency distribution (TFD), a smooth-windowed wigner-ville distribution (SWWVD) used to represent time-varying signals in time-frequency representation (TFR). Good time and frequency resolutions offer superiority in SWWVD to analyze voltage variation signals that consist of variations in...

This paper introduces the accurate identification of harmonic sources in the power distribution system using time-frequency distribution (TFD) analysis, which is S-transform. The S-transform is a very applicable method to represent signals parameters in time-frequency representation (TFR) such as TFR impedance (ZTFR) and the main advantages of S-tr...

A harmonic source diagnostic analytic is a vital to identify the location and type of harmonic source in the power system. This paper introduces a comparison of machine learning (ML) algorithm which are support vector machine (SVM) and Naïve Bayes. Voltage and current features are used as the input for ML are extracted from time-frequency represent...

Many techniques used and still in usage for solving the problem of islanding detection are intrinsically passive, active, or hybrid of both, each have its own benefits and drawbacks. In this paper, we propose a method which takes the advantage of a machine learning (ML)-based algorithm namely support vector machine (SVM), in order to produce the re...

This article focuses on addressing the data aggregation faults caused by Phasor Measuring Unit (PMU) by installing Wireless Sensor Networks (WSN) in the grid. All data that is monitored by PMU should be sent to base station for further action. But the data that is sent from PMU does not reach the main server properly in many situations. To avoid th...

Certificate

In a smart city environment, the primary goal of the operation is realized through energy management and the level of comfort. The energy consumption may increase to maintain a higher level of comfort. However, with energy resources depleting day by day the energy crisis has become a burning issue, and, in this scenario, every single unit saved is...

This paper presents a new approach for determining the impact of lightning strikes on transmission network elements failures based on fuzzy logic (FL) and expert systems. The location of lightning strike is determined by means of system for lightning location (SLL) and failures in the transmission network, sorted by type of the equipment, are obtai...

The main criteria in microgrid are to focus the power quality issue. The renewable sources used are fluctuating in nature and this fluctuation has to be suppressed by designing control variable to nullify the circulating current caused by voltage fluctuation and deviation. The switching losses across the power electronic switches, Harmonics, circul...

In late 2018, the main standard that defines the arc flash equations, the “IEEE 1584 : Guide for Performing Arc-Flash Hazard Calculations” standard, was updated for the first time since 2002. This new version of the standard brought many changes with regards to arc flash studies. This webinar, Simon Giard-Leroux, PE at CIMA+, was an in-depth presen...

The cheap and reliable primal energy source for BESS refueling necessitates a special attention for combining RERs with PHEV charging stations in microgrids. Rapid charging is an operation mode of PHEV for drivers which demands fast recharging of BESSs of the electric cars. This charging mode manifests as low impedance short circuit at DC side, mak...

IEEE SM membership for 27 years

Webinara from Jim Castain from EasyPower LLC, how to use power flow analysis and harmonica analysis , filter design, frequency scan, and transformer derating due to higher harmonic flow

The paper present advantages of dynamic Reactive Power compensation facilities instead of until now used fixed compensation, as a standard technical solution in railway. Short overview of theory in the field of FACTS device is given. Simulations of these systems have been successfully developed in the MATLAB Simulink program. Some of main part in p...

Very interesting webinar about arc flash detection in time of 1 ms !!!! Also about measures for removing arc flash risk.

The increasing integration of distributed generation (DG) of different types (biomass, biogas, wind power, photovoltaic etc.) leads to increase the reliability of the distribution network DN) and may bring some new problems with protection relays coordination. Insufficient or deliberate outages of these DGs on the network can cause a problem with t...

Abstract: With the ever-growing power demand, the energy efficiency in the commercial and residential buildings has become a matter of great concern. Also, the strategic energy auditing (SEA) and demand-side management (DSM) are the cost-effective means to identify the requirements of power components and their operation in the energy management sy...

Webinar about news in IEEE 1584-2018 arc flash risk assessment for low voltage networks

Abstract: This paper presents an intelligent electronic device (IED) utilized for automatic meter readings (AMR) scheme using "Open-Source" software. This IED is utilized to measure a low-voltage intelligent electronic device) system with a boundless number of sensors, and it is accessible on the Internet of Things (IoT). The utilized equipment for...

Certificate of publication

Webinar about using the Arc Flash analysis module in EaszPower software with the latest IEEE 1584-2019 standard and the influence of protection coordination on the Arc flash incident energy.

In this webinar, Cansu Yildirim, Business Development Manager for Control & Protection Solutions at ABB in Germany, provided an overview of different Short-Circuit Fault Current Limiters and practical examples of how they can be used in various applications, improving the operator and system protection significantly

One of the most crucial problems in distribution network (DN) is islanding detection. This paper presents a new Gibbs phenomenon-based hybrid method for islanding detection in low voltage (LV) DNs, which is a combination of active and passive method of frequency rate of change at given moment and constant total harmonic distortion (THD) measurement...

Blocking Arc Flash Energy from Personnel and Assets for Safety and Resiliency. In this webinar, Erhan Cokel from Schneider Electric discussed new solutions that provide the next level of protection against the hazards of an electrical arc flash for equipment and personnel. Learn how these solutions provide enhanced safety and ensure continuous avai...

This paper presents the advantage of using a FACTS device for dynamic reactive power compensation. Simulation model was built in MATLAB/Simulink software to prove mathematical constrains. Determination of the most favourable locations and size of the compensation devices from the aspect of losses, power quality, costs are calculated as fitness func...

Voltage and frequency regulation is one of the greatest challenges for proper operation subsequent to the isolated microgrid. To validate the satisfactory electric power quality supply to customers, the proposed manuscript tries to enhance the quality of energy provided by DG (Distributed generation) units connected to the subsequent isolated grid....

This paper presents a new islanding detection method for low-voltage (LV) inverter-interfaced microgrids based on adaptive neuro-fuzzy inference system (ANFIS). The proposed islanding detection method exploits ANFIS pattern recognition capability and its nonlinear mapping of relation between inputs. The ANFIS monitors seven inputs measured at point...

Islanding problem of DG-s in distribution network (DN) comes with development and implementation of renewable energy sources (RES) as distributed generator (DG). This research introduces new hybrid method for islanding detection of DC/AC inverter based DG in low voltage (LV) DN. Proposed technique is combination of active and passive technique: fre...

Link https://www.sciencedirect.com/journal/computers-and-electrical-engineering/special-issue/10WQRS3BJBQ

Elsevier Journal Computers and Electrical Engineering Extends its appreciation.

Stochastic production from wind power plants imposes additional uncertainty in power system operation. It can cause problems in load and generation balancing in the power system and can also cause congestion in the transmission network. This paper deals with the problems of congestion in the transmission network, which are caused by the production...

Review certification

In this paper, a measurement device based on "Open Source" components of hardware and software will be presented. This device has been used to measure voltages and currents of a low-voltage (LV) networks, on which a virtually unlimited number of sensors can be added, and the device is assembled of components available on electronic components Inter...

Significant increase of distributed generation (DG) presence and active distribution network (ADN) development cause changes in distribution network’s power quality (PQ), mostly in distorted system voltages and currents. This paper analyses harmonics generation from multiple DG types, such as solar and biogas power plants, and simulates harmonic in...

Reviewer certificate

Energy Reports Awarded since January 2018 (3 reviews) presented to SRETE NIKOLOVSKI in recognition of the review contributed to the journal

Measurement Certificate of reviewing Awarded since December 2017

Electric Power Systems Research awarded October 2018 to Srete Nikolovski in recognition of the contributions made to the quality of the journal

Publishing in IEEE Transactions and as a Senior Member during 28 years, in good standing through December 2019, denoting a personal and professional commitment to the advancement of technology.

Review confirmation cetificate

International Meeting of Andvanced Technology in Energy and Electrical Engineering

This paper presents the complexity of ship propulsion, modeling of its power grid, short circuit calculation and protection coordination in the ship network. Today's ships can be considered as island facilities with their own power generation and electricity consumption. After designing the ship's power system, choosing generators, transformers, ca...

Sažetak Povećan udio obnovljivih izvora izvore (OIE) u distribucijskoj (DN) pa i prijenosnoj mreži (PN) dovodi pred nove izazove inženjere zaštite i osoblje koje vodi pogon DN i PN mreže, ali i projektante sunčanih i elektrana na biomasu ili bioplin i dispečere u elektranama. Zbog sve većeg udjela OIE povećava se pouzdanost opskrbe potrošača elektr...

Attending webminar What is new in IEEE 1548 realese 2018 standards and codes for Arc Flash hazard assessment

One of the most crucial and economically beneficial tasks for energy customer is peak load curtailment. On account of the fast response of renewable energy resources (RERs) such as photovoltaic (PV) units and battery energy storage system (BESS), this task is closer to be efficiently implemented. Depends on the customer peak load demand and energy...

http://ieee-powertech.org/

Reviewer for MDPI Journals Energies and Sustainability, till now 21 papers

Wide application of distributed energy sources of various types leads to CO2 emissions reduction as well as to new problems regarding proper coordination of the protection of these power plants interfacing the network and possible increased network instability. Accidental or deliberate outbreaks of these distributed sources may cause a problem with...

This paper presents a method for computation of arc flash incident energy in mixed alternating current (AC)/direct current (DC) systems with DC units such as strings, panel cabinets, inverters in Photovoltaic (PV) power plant, as well as on AC side behind the inverters connected to the distribution network. It also gives measures to reduce the risk...

This paper presents an arc flash risk assessment procedure using different computer tools from different countries. Different computation methods according new requirements in NFPA 70E (2018), IEEE 1584 and DGUV I 203-077 standard. Three different software are used and compared incident energy (EI) or full energy (WE), arc flash boundary and the le...

In this paper, a new islanding detection strategy is presented for low-voltage (LV) microgrid consisting of voltage-sourced converter (VSC)-based including renewable/ distributed energy resources (RERs/DERs). The nonlinear mapping of relation between inputs and pattern recognition capability of adaptive neuro-fuzzy inference system (ANFIS) is the k...

This paper presents a method for computation of arc flash incident energy in mixed alternating current (AC)/direct current (DC) systems with DC units such as strings, panel cabinets, inverters in Photovoltaic (PV) power plant, as well as on AC side behind the inverters connected to the distribution network. It also gives measures to reduce the risk...

Abstract— The basic challenge of today's energy system is to increase the flexibility of the network in the context of greater energy demands and the increasing presence of intermittent renewable energy sources. The answer is in advanced networks (Smart Grid) based on an active approach to the demands of end users who can contribute with their ener...

By determining the losses in the power system, the aim is to determine the difference between the theoretical values and the actual losses obtained by measuring, to determine the reason for this difference, and to propose a theoretical method for selecting the calculation method that best corresponds to each type of transmission system. It is impor...

MDPI is a publisher of open access, international, academic journals. We rely on active researchers, highly qualified in their field to provide review reports and support the editorial process. The criteria for selection of reviewers include: holding a doctoral degree or having an equivalent amount of research experience; a national or internationa...

MDPI is a publisher of open access, international, academic journals. We rely on active researchers, highly qualified in their field to provide review reports and support the editorial process. The criteria for selection of reviewers include: holding a doctoral degree or having an equivalent amount of research experience; a national or internationa...

Given the fact that more and more renewable energy sources are exploited in order to get electrical energy to this work gives a review of that way of transformation using photovoltaic power (PV) plant. The model is made in the Easypower software package In coordination protection there shall be provided adequate time delate of protection deviceson...

People who work near electrical installations are potentially exposed to dangers caused by an electric arc, which is rare appearance, but still requires reliable protection, as it cannot be completely eliminated, especially by actions during operation. An electrical arc is possible when the parts are disconnected by live working (lines, cable conne...

Certificate

Photovoltaic (PV) modules play an important role in modern distribution networks; however, from the beginning, PV modules have mostly been used in order to produce clean, green energy and to make a profit. Working effectively during the day, PV systems tend to achieve a maximum power point accomplished by inverters with built-in Maximum Power Point...