Energy Systems Research

Cost Analysis of an Optimized Hybrid Energy System for a Remote Area in St. John’s, NL

2023-01-17T04:17:39+03:00

In the current energy field scenario, hybrid energy, combining both conventional and non-conventional energy, plays a significant role. With the development of technology, this new energy category has gained popularity due to its efficiency and cost-effectiveness, especially in remote places where the primary grid is located far away. This research puts forth an optimum design of a PV-diesel hybrid energy system for analysis of a remote off-grid power system in St. John's, Newfoundland, Canada, using HOMER (Hybrid Optimization Model for Electric Renewables) software. The study involves connecting a diesel generator and a PV solar panel to the bus. To ensure uninterrupted load distribution, batteries are combined as storage. A technical and economic study of the hybrid energy system is conducted by simulation through HOMER. The levelized energy cost is expected to be lower under the proposed arrangement.

Identification of Promising Research Issues in the Digital Industry Topic by Analyzing Scopus Bibliometric Data for 2018 – 2022

2022-10-17T16:26:01+03:00

The paper aims to identify promising research issues on the topic of Digital Industry based on the analysis of bibliometric data from Scopus platform for 2018–2022. To this end, the titles and abstracts of highly cited works by authors with high publication activity were considered. Authors' Scopus profiles were used to determine their affiliations, which are important for an in-depth analysis of selected promising Digital Industry strands. Metadata filtering was performed to identify highly cited papers on particular issues by keyword, subject area, affiliation with countries and sponsoring organizations. Additionally, bibliometric metadata were clustered based on the co-occurrence of terms using VOSviewer. Within these clusters, articles of interest were identified for the formulation of promising research issues on the topic of Digital Industry, which will be thoroughly examined in separate papers.

Ensuring the Reliability of Energy Systems with a New Method for Reducing Seasonal Variations in Ground Resistance

2022-10-20T12:12:53+03:00

The paper shows the possibility of improving the reliability of a grounding system. The moisture dependence of soil resistivity is analyzed. Based on the analysis, the soil composition was proposed to normalize (reduce seasonality) its electrical resistivity. Several full-scale experiments are carried out to measure the resistance of grounding devices of experimental circuits, after backfilling the places of laying the circuit components with soil of various compositions and using other types of soils and minerals.

Application of FACTS Devices for Damping of Low-Frequency Oscillations in Azerbaijan's Power System

2022-10-20T11:53:24+03:00

The structure of Azerbaijan's power system is characterized by its substantial heterogeneity, i.e., unevenly loaded transmission lines in a large number of power flows, limited possibility of wheeling through backbone tie-lines due to the bypass power grid operation. The use of Flexible AC Transmission System (FACTS) devices makes it possible to impart active properties to a passive electrical network and thus provide flexible control over the operation of the power system. FACTS devices increase the transfer capability of the electrical network. It is known that a system of automatic control of damping can be used to augment the stability of power systems. Damping may be achieved using other devices installed with the express purpose of stability augmentation. Disruption of stability of the power system is the result of loss of synchronism of the generator rotor because of insufficient damping torque of low-frequency oscillations (usually 0.1–1.0 Hz) and local oscillations (1–3 Hz). We propose improving the damping of low-frequency oscillations by placing a unified power flow controller in the power system. The efficiency of the application is demonstrated through a case study of a 220 kV – 330 kV – 500 kV network.

Improving the Reliability of the Central Asia Power System in the Context of the Energy Transition

2022-10-20T11:33:02+03:00

This paper provides an analysis of the issues concerning the improvement of the reliability of the Central Asia Power System in the contexts of its operation and the energy transition. The study considers the integration of renewable energy sources in the power system, given their prospective capacity additions to be made before 2030.

The Mongolian and Russian Coals On the International Market – Is the Competition Real?

2022-06-24T11:58:18+03:00

The coal industries in Russia and Mongolia tend to increase coal supplies for export. The competition between Russian and Mongolian coal so far concerns only the Chinese coal market. In the future, however, there can be competition in the international coal market of the countries in the Asia-Pacific Region (APAC). Mongolia exports mainly premium (coking) coal. Russia exports coking and steam coal, with a predominance of steam coal. An analysis of the factors influencing the development of Mongolian and Russian coal export to the APAC countries indicates that the increase in export supplies is limited mainly by the capabilities of the transport infrastructure and geopolitical conditions. Mongolia has additional restrictions due to its geographical position, since the country does not have access to sea trade routes, which creates the need for cooperation with Russia and China to enable access to the sea coast. The Russian coal industry depends on the coal supply for export to a lesser extent than the Mongolian coal industry. At present, almost all Mongolian coal exports go to China, while the share of exports to China in the volume of Russian coal exports to the Asia-Pacific countries is no more than 30%. An analysis of the development indices for the coal industry in Mongolia and Russian regions exporting coal to the Asia-Pacific countries has not shown a significant influence of the Mongolian factor on the volume of Russian coal exports.

The Influence of Electric Vehicle Charging Stations on the Quality of Power Supply to the Consumer in Novosibirsk 10/0.4 KV Electrical Networks

2022-09-27T13:07:27+03:00

Currently, there is a massive use of electric vehicles in the world. This is due to the ever-increasing importance and severity of the environmental safety issue. Now, there is no more convenient, affordable, popular and at the same time less harmful alternative to road transport. The annual global emissions are more than 25 million tons of pollutants of various origins, which are extremely dangerous for nature in general. On average, they increase by 3% every year. The transport sector accounts for 23% of all greenhouse gas emissions in the world. Electric vehicles can contribute enormously to the reduction in greenhouse gas emissions. In 2025, sales of electric vehicles are expected to increase to 100 000 units. By 2030, the number of electric vehicles will reach 1.5 million units. However, widespread adoption of electric vehicles will cause an increase in electricity consumption. In addition, an appropriate charging infrastructure is required to power electric vehicles. It is worth noting that the market for electric vehicles and charging stations is developing dynamically with an annual growth rate up to 80%. The main barriers to the development of electric vehicles in Russia are their high cost and underdeveloped network of charging stations. The relevance of the problem is confirmed by an order signed by Prime Minister Mikhail Mishustin in March 2022 to allocate about 1.37 billion rubles for the creation of charging infrastructure for electric vehicles in Russia. As for incentives, there are many of them. This is the need to solve the environmental problem in large cities, achieve the goal of reducing CO2 emissions and pursue industrial policy, including the policy of innovative development of the country. Another way of increasing the payback of charging stations is the employment of smart services, which can reduce the cost of technological connection through dynamic power distribution between the main facility and the charging station. There are other, more advanced solutions, which are currently being piloted, such as optimization of investment in network infrastructure, including an operator of a regional public charging infrastructure. This study focuses on the development of a power supply system to connect an electric vehicle charging station to a substation in Novosibirsk. The connected electric vehicle charger, being a non-linear load, can not only increase the load on the power grid infrastructure, but also cause a deterioration in the power quality due to the generation of harmonic distortions. Therefore, special attention is paid to the analysis of the power supply quality during the operation of the charging station by using the model developed in the MATLAB Simulink software for the analysis of harmonics.