Preface

The 2023 7th International Conference on Hydrodynamics, Energy and Electric Power System (HEEPS 2023) was held in Beijing, China from April 21sr to 23rd, 2023 (virtual form). The purpose of HEEPS 2023 was to discuss the present status and future perspectives of hydrodynamics, energy and electric power system. The following topics were selected in order to cover most of the scientific program and highlight an area where new ideas have emerged over recent years:(1) Hydrodynamic Experiments and Testing Techniques;(2) Fluid-induced Vibration and Noise;(3) Hydro-hydraulic Calculations;(4) Energy Storage Technology;(5) Power and Energy Circuits and Systems, etc.There were about 60 participants. In addition to the keynote speeches, we had many talks selected from contributed papers. There were invited, oral, and poster sessions. This proceedings contains the papers presented in invited and selected talks together with those presented in poster sessions.At the Conference, the participants discussed a wide range of issues affecting the theoretical and computational aspects of research problems in hydrodynamics, energy and electric power system. Besides, we had a comprehensive overview of this fascinating field and of future scenarios thanks to the participation of delegates from all around the world. Professor Fujun Zhang from Beijing Jiaotong University, China performed a keynote speech and shared with us his own research experience and professional view with the report Recent Development of Ternary Organic Solar Cells with BHJ or LbL Structure. His main research areas are solar cells, photodetectors and light sources. In the past five years, he has published more than 40 academic papers in IF more than 10 journals as corresponding author, and has been cited more than 10000 times (Google). Among them, 27 papers have been highly cited by ESI. One paper was rated as “China’s 100 Most Influential International Academic Papers”.We wish to acknowledge our host institutions, sponsors, and the many people whose work made this Conference possible. We would like to express our gratitude to the members of the Academic Committee and those of the Organizing Committee for their efforts which made this Workshop successful. Particularly we would like to present our great thanks to the editors and other colleagues of Journal of Physics: Conference Series for their patience and kind assistance in publishing this paper volume.List of Committee Member is available in this Pdf.

This volume contains the peer-reviewed proceedings of the 2025 9th International Conference on Hydrodynamics, Energy and Electric Power System (HEEPS 2025), held as an on-site conference in Nanjing, China, from June 20th to June 22nd, 2025. HEEPS 2025 served as a valuable forum for academics and industrial professionals to convene and exchange knowledge in the interconnected fields of Hydrodynamics, Energy, and Electric Power Systems. The conference successfully achieved its primary objectives: fostering research and development activities and facilitating the interchange of scientific information among researchers, developers, engineers, students, and practitioners from across the globe. List of Committee Member is available in this PDF.

The integration of multi-energy systems is an important feature of energy internet system. The traditional energy systems, such as electric power, thermal power, gas and other energy systems, are operating separately. All kinds of energy systems have been separated and self-made in a long time. They are managed by different departments, and it is difficult to set up a centralized dispatching agency for operation management, which restricts the development of energy internet system greatly. Block chain technology has the main characteristics of decentralization and transparency. Therefore, a decentralization dispatching and operation control mechanism based on block chain technology for multi-energy fusion system is proposed in this paper. Through the establishment of decentralized dispatching agencies for operation management, it is proposed to share the information of energy supply and demand relationship between different energy systems and different regions in multiple energy systems. An optimal operation model of self-dispatching decision-making is established to obtain the results of energy self-dispatching transaction of each energy demand node. Finally, a simulation is conducted of a multi-energy system, and the calculation results verify the effectiveness and feasibility of the self-scheduling decision-making optimization model proposed in this paper.

This study proposes a day‐ahead optimal energy dispatch model for integrated energy system based on AC/DC interconnected infrastructure. In the infrastructure, micro‐turbines turn high‐frequency AC power into industrial‐frequency AC power and incorporate it into the energy system's power system. Within the process, waste heat is sent into the waste heat boiler and lithium bromide chillier to interconnect with the heating and cooling systems. DC battery and photovoltaic generations connected with the energy system's power grid through the inverter are used as the flexible energy storage and power generation unit to build an autonomous integrated energy system based on AC/DC interconnection. In the optimisation model, the goal is set as system's lowest daily operation cost and lowest energy consumption. The constraints include system operation constraints and equipment constraints. Simulation results show that by performing the schedule made by the dispatch model, the operating efficiency of various types of AC/DC equipment in the energy system has been improved, energy waste scene has been reduced significantly and energy consumption in the energy system is reduced by 16% compared with other energy supply structure without AC/DC interconnected infrastructure under traditional schedule strategies.

Guest Editorial: Situational awareness of integrated energy systems

Advances in integration of energy, water and environment systems towards climate neutrality for sustainable development

Two important strategies, electric power and clean energy substitution in energy system, are used to counter the effects of resource and environment limitation. Firstly, establishing a green power market space measurement model which extend the concept of power gap, introduces a dynamic adjustment process into the regional power balance. Secondly, the electric power substitution potential evaluation model with sub-regional and sub-technology categories gives a diversified anticipation of power demand based on the traditional power demand forecasting method. Then considering significant randomness and intermittency brought by high penetration of clean energy access in the future, an improved power planning optimization model is integrated. Finally, the generation and power flow capacity planning for 14th and 15th five-years in China is optimized by the model, providing references to the development of energy and power system.

Advancements in sustainable development of energy, water and environment systems

Due to recent pandemic, 2022 4th International Conference on Energy Systems and Electrical Power (ICESEP 2022) was held virtually online on May 20-22, 2022. The decision to hold the virtual conference was made in compliance with many restrictions and regulations that were imposed by countries around the globe. Such restrictions were made to minimize the risk of people contracting or spreading the COVID-19 through physical contact. There were 120 individuals who attended this online conference, represented many countries.ICESEP 2022 is to bring together innovative academics and industrial experts in the field of energy systems, electrical engineering and power engineering to a common forum. The primary goal of the conference is to promote research and developmental activities in energy engineering, electrical engineering and power engineering and another goal is to promote scientific information interchange between researchers, developers, engineers, students, and practitioners working all around the world.During the conference, the conference model was divided into three sessions, including oral presentations, keynote speeches, and online Q&A discussion. In the first part, some scholars, whose submissions were selected as the excellent papers, were given about 5-10 minutes to perform their oral presentations one by one. Then in the second part, keynote speakers were each allocated 30-45 minutes to hold their speeches. In the second part, we invited four professors as our keynote speakers. Prof. Ismail Musirin, Universiti Teknologi MARA, Malaysia. Most of his researches dealt with the algorithms and techniques development in solving problems in Power System involving voltage stability, economic power dispatch, transient stability and so on. The second keynote speakers, Prof. Haslenda, Universiti Teknologi Malaysia, Malaysia. Prof Haslenda has an impressive list of high-quality publications (more than 200 publications to date according to Scopus) that have attracted over 5200 citations with h-index of 35. Prof. Abdul Hasib Chowdhury, Bangladesh University of Engineering and Technology, Bangladeshi. His research interests include power system planning, stability, reliability analysis, contingency and security analysis, vulnerability analysis, power quality analysis etc. Lastly, we were glad to invite Rafiziana Md.Kasmani, Universiti Teknologi Malaysia, Malaysia. Her research passions are focused on fire engineering, gas and dust explosion, and fire and explosion modelling. Their insightful speeches had triggered heated discussion in the third session of the conference. Every participant praised this conference for disseminating useful and insightful knowledge.The proceedings are a compilation of the accepted papers and represent an interesting outcome of the conference. Topics include but are not limited to the following areas: Energy Saving Technologies, Energy Engineering and Environmental, Renewable Energy Technologies and Systems and other related topics. All the papers have been through rigorous review and process to meet the requirements of international publication standard.We would like to acknowledge all of those who supported ICESEP 2022. The help and contribution of each individual and institution was instrumental in the success of the conference. In particular, we would like to thank the organizing committee for its valuable inputs in shaping the conference program and reviewing the submitted papers.List of Committee member is available in this pdf.

Over the last few decades several innovative ideas have been explored in the energy storage areas, ranging in size, capacity, design complexity, and targeted applications. Some of them are designed for large scale power system applications, others for smallor medium-scale renewable energy or hybrid power systems, while the others are designed to perform short-term energy storage ride through for critical infrastructure (communication systems, hospitals, military facilities, etc.). Energy storage has become an enabling technology for renewable energy applications, grid integration and enhancing power quality and stability in the power transmission and distribution, having a great potential to improve power grid quality and stability and to provide an alternative to fossil fuel-based energy generation. The major constraints for renewable energy penetration are the availability, intermittency, and variability, which can be addressed through energy storage. The energy storage choice depends on specific usage requirements, often incorporating several energy storage systems in order to increase system reliability, capacity, and supply security. In the electric power system, the renewable energy promise lies in its potential to increase grid efficiency, reliability, or in optimizing power flows and supporting variable power supplies. The parameters used in comparisons of various energy storage technologies include efficiency, energy capacity and density, run time, costs, system's response time, lifetime in years and cycles, self-discharge, and maturity of each energy storage technology. The most common energy storage technologies include compressed air, pumped hydro, batteries, fuel cells, flywheels, and super-capacitors. The last four are suitable for the medium scale applications. The chapter discussed energy storage technologies and gives an up to date comparative summary of their performances. After completing this chapter, the readers are able to understand the role, importance, configurations and topologies of energy storage systems, operation principles, characteristics, performances, and operation of major energy storage systems used in power systems, buildings, and industrial facilities. Another benefit is that readers are able to understand the critical role and necessity of energy storage systems in power and renewable energy systems, the differences between large-, mediumand small-scale energy storage systems, and how a system is selected on specific applications based on system characteristics and performances. Major energy storage technologies discussed in this chapter are compressed air energy storage, pumped hydropower storage systems, batteries, flywheels, hydrogen energy storage, fuel cells, supercapacitors, and superconducting energy storage systems. Thermal energy storage systems are covered in detail in the next chapter. This chapter provides comprehensive reviews of the energy storage technologies and gives an up to date comparative summary of their performances, characteristics, and applications.

Summary Superconducting magnetic energy storage (SMES) is known to be an excellent high-efficient energy storage device. This article is focussed on various potential applications of the SMES technology in electrical power and energy systems. SMES device founds various applications, such as in microgrids, plug-in hybrid electrical vehicles, renewable energy sources that include wind energy and photovoltaic systems, low-voltage direct current power system, medium-voltage direct current and alternating current power systems, fuel cell technologies and battery energy storage systems. An extensive bibliography is presented on these applications of SMES. Also, some conclusive remarks in terms of future perspective are presented. Also, the present ongoing developments and constructions are also discussed. This study provides a basic guideline to investigate further technological development and new applications of SMES, and thus benefits the readers, researchers, engineers and academicians who deal with the research works in the area of SMES. Copyright © 2017 John Wiley & Sons, Ltd.

Changing framework conditions requires adapting financial valuation methods for power plants and energy systems. Up to now newly developed or adapted valuation methods have been validated qualitatively, based on expert statements. This paper presents a structured development process for quantitative validation of valuation methods.The Xerox method for developing a benchmark is used to develop key figures that verify the plausibility of the simplified Valuation Methods. The method for developing a simulation study is used to analyze the requirements of a simulation model whose results can serve as reference values for benchmarking. To support the plausibility of the approach, structured methods were used to create both the benchmark and the simulation model.The process results in the development of a framework that serves as a baseline to perform a benchmark of the different methods. These provide indicators that analyze quantitatively the validity of the valuation methods. Existing simulation models for complex energy systems need to be adapted to provide the required reference values. This needs modification of these models, based on the requirements of the valuation methods. The results provide then a novel approach to the evaluation of these valuation methods.KeywordsEnergy system investmentValuation methodQuantitative evaluationFlexibility

Due to the unsustainability of fossil fuels and the adverse impacts on the environment, along with the rapid growing energy demands, smart energy becomes a new trend. To achieve its carbon peak and neutrality targets in China, smart Energy is the main battlefield, electricity is the main force, and the construction of a new power system is an important content of the construction of smart energy system. The 2nd International Conference on Smart Energy and New Power Systems (SENPS2024) is to promote research and developmental activities in Smart Energy and New Power Systems by creating a platform to promote scientific information interchange between researchers, developers, engineers, students, and practitioners working all around the world. The conference will also make it an ideal platform for people to share views and experiences in related areas. With all contributions from the participants, 23 papers are final accepted from 88 submissions. Those accepted ones are well categorized into four sectors as follows: Smart Energy, Smart Grid, Power Electronics Technologies and New power system. We wish to show our sincere appreciations to Hunan University of Technology, Changsha Normal University, CRRC Zhuzhou Institute Co., Ltd which provided various platform to promote this conference with nice service. We are also thankful to the authors and reviewers for their contributions in this volume. We are also very much thankful to the organizations for contributing their time and expertise to maintain the quality of this proceeding. This time the conference service is supported by Digital Intelligence Academic Service Innovation Team from Changsha Normal University and funded by Research on the construction of international promotion platform for Chinese educational brands - A case study on the organization and management of international academic conferences from China Education Association for International Exchange. Last but not least, we especially thanks to the team of IOP Conference Publishing team for support to bring out these proceedings of this conference. we will feel honorable to have your continuous attention and attendance for our next edition of SENPS. List of Conference committee are available in this Pdf.

The electric power system's seasonality would mitigate the problem of the energy volatility crisis. Seasonal identification is important in energy usage analysis to make a better an organization's energy performance. Identification of the seasonal component in a time series data is essential since it defines a fluctuation within an interval of time. This seasonal component can be identified as a periodic phenomenon. Signal processing models can be used in analyzing periodic data in the representation of sinusoidal function. Seasonal variations are an important factor influencing the behavior of an electric power and energy load. This paper introduces the application of deterministic functions in the Ornstein\textendash Uhlenbeck process as a sinusoidal signal processing model in identifying seasonal components represented in periodic terms. We conducted extensive experiments to validate the model on three datasets in electric power and energy systems namely electricity load, household electric power consumption, and power consumption of the three source stations. Further, it can be obtained that the periodic continuous-time-inhomogeneous signal of Ornstein\textendash Uhlenbeck model can be used to identify the seasonal term of the very short to medium horizon forecast of the electric power and energy system. Seasonal changes in energy consumption can be used in energy management in the scope of energy efficiency connected to renewable energy plans.

Progress and Prospects for Research and Technology Development of Supercritical CO2 Thermal Conversion Systems for Power, Energy Storage, and Waste Heat Recovery