This paper presents a genetic algorithm (GA) based approach for the solution of the optimal power flow (OPF) in distribution networks with distributed generation (DG) units, including fuel cells, micro turbines, diesel generators, photovoltaic systems and wind turbines. The OPF is formulated as a nonlinear multi-objective optimization problem with equality and inequality constraints. Due to the stochastic nature of energy produced from renewable sources, i.e. wind turbines and photovoltaic systems, as well as load uncertainties, a probabilisticalgorithm is introduced in the OPF analysis. The Weibull and normal distributions are employed to model the input random variables, namely the wind speed, solar irradiance and load power. The 2m+1 point estimate method and the Gram Charlier expansion theory are used to obtain the statistical moments and the probability density functions (PDFs) of the OPF results. The proposed approach is examined and tested on a modified IEEE 34 node test feeder with integrated five different DG units. The obtained results prove the efficiency of the proposed approach to solve both deterministic and probabilistic OPF problems for different forms of the multi-objective function. As such, it can serve as a useful decision-making supporting tool for distribution network operators.

The transport of dangerous goods poses a significant challenge for the industry, given the potential risks to safety and the environment. This paper analyzes key aspects of regulation and training that affect the efficiency and safety of this sector. Based on a literature review, a survey was developed and conducted in 2023 among 204 respondents, professionals in the field of dangerous goods transport in Serbia. The survey was distributed through electronic channels, allowing for broad access to various industry participants. It encompasses questions that describe six constructs: assessment of the dangerous goods transport environment, legal framework and regulatory familiarity, vehicle classification and documentation, training and certification, vehicle inspection and maintenance, and statistics and procedural aspects. The survey results indicate varying levels of satisfaction with regulation and training. According to the respondents, 35% rated the regulatory process for obtaining a professional competence certificate for dangerous goods advisors as "very good," while 24.8% rated it as "satisfactory." Regarding the training content for certificate renewal, 29.1% of respondents rated the content as "very good," but 10.2% expressed dissatisfaction, suggesting a need for improvement in training programs. The analysis of administrative costs reveals that only 5.8% of respondents rated these costs as "excellent," indicating a need for strategies to reduce costs to enhance accessibility and competitiveness in the dangerous goods transport sector.

The UN Sustainable Development Goals (SDGs) are a global call for action to end poverty, protect our planet's environment and climate, and provide opportunities for all people to enjoy peace and prosperity. Decarbonizing the transport sector is key to achieving the UN and EU climate goals. Under the Paris Agreement, EU countries have committed to making the EU climate-neutral by 2050. To achieve the goal of net neutrality, EU countries have set a goal to reduce net greenhouse gas emissions in all sectors (especially transport) by at least 55% by 2030 compared to 1990 levels and to continue to gradually reduce emissions by 2050, when there should be zero greenhouse gas emissions from all sectors. The Regional Development Strategy, i.e. the Green Agenda for the Western Balkans, aims to respond to the challenges of climate change and green transition and to help the countries of the Western Balkans harmonize environmental regulations with European standards and norms. Electric mobility and management of E mobility is becoming a decisive element in the smart and sustainable development of cities and local communities as one of the UN Sustainable Development Goals. The transition to electric mobility (e-mobility) in urban areas requires a combination of infrastructure, smart grid technologies, vehicle advances, and digital platforms to ensure efficiency, accessibility, and sustainability. Several cities around the world have successfully integrated e-mobility technologies into their urban transport systems. The paper analyses cities that showcase different aspects of electric mobility transformation, with a detailed analysis of the financial investments and economic benefits associated with e-mobility projects in each of the selected cities. Western Balkan cities are gradually adopting e-mobility solutions through subsidies for electric vehicles, expansion of charging infrastructure, electrification of public transport, and integration of micro-mobility. This paper analyses cities in Southeast Europe and the Western Balkans, the challenges in fully adopting e-mobility, and their efforts to implement smart and sustainable urban transport solutions.

Sustainable transport encompasses environmentally friendly transportation modes that minimize negative environmental impacts, optimize energy consumption, and enhance quality of life. The concept of sustainable transport is a key objective in contemporary transport policy strategies, with an analysis of relevant strategic documents identifying opportunities for its implementation in the Republic of Serbia. A fundamental step in developing strategic transport documents is the assessment of the current state. As part of this research, a survey was conducted among 208 respondents to examine public perceptions and attitudes towards walking, cycling, public transport, electric mobility, and environmental aspects of transportation. The research findings provide insights into user habits, identified barriers, as well as the advantages and disadvantages of various transport modes in the context of daily commuting. The results of this study contribute significantly to the formulation of local policies aimed at developing a sustainable transport system and improving urban mobility.

This paper analyzes errors in the estimation of induction-motor-equivalent circuit parameters using an improved combined two-stage Particle Swarm Optimization (PSO) method. The proposed method accounts for variations in rotor parameters based on both linear and square root speed approximations, as well as two different approaches for the stator and rotor leakage reactance ratios. The first approach assumes that the starting rotor leakage reactance is equal to the stator leakage reactance, while the second considers them as distinct. Improvement of the algorithm consists of increasing the accuracy of the approximations of parameter changes on the rotor. Thanks to more accurate determination of the initial rotor parameters, both approximations provide better results in parameter estimation. The analysis involved sixteen induction motors with four different power ratings and four different pole numbers. The analysis aimed to assess the impact of these approximations and assumptions on equivalent circuit parameter estimation errors. The estimated torque-speed characteristics closely matched the manufacturer’s reference data, including starting, maximum, and full-load torques. The deviation of the estimated torque-speed characteristics from the reference characteristics, within a defined speed range, is defined as the mean absolute percentage error. Based on the obtained results, the mean absolute percentage error is complex and depends on rotor parameter speed approximations, stator and rotor leakage reactance ratios, and the full power of the induction motor.

Mobility is experienced differently by different groups of people, and their specific needs should be considered by applying a participative approach and involving users and actors concerned. Furthermore, an integrated and holistic approach should be applied, allowing people to be aware of the interdependencies of actions taken in one area on others (environmental, economic, social and governance). A lot of cities and urban settlements in the last decade have contributed to safe and safer cities, especially pedestrians, users of public transport, cyclists and other public activities, with the design of space and new streets, and especially by the redesign of space and existing streets. The approach to space, urban mobility is changing, planners and urban planners are emerging with new ideas, who, together with the technical professions of traffic and construction engineers, are launching new forms of design that help safe, safe, humane urban living. In this paper will be given guidelines for accelerating transformational change towards sustainable urban mobility through innovative and integrated electric mobility solutions. The paper will also analyze the segment of engineering education in e-mobility and innovative solutions in e-mobility.