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Dynamic Setting Method of Assessment Indicators for Power Curves of renewable energy Sources Considering Scarcity of Reserve Resources

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Journal of Modern Power Systems and Clean energy 2024年第1期12卷 101-114页

作者： Minghao Cao Jilai Yu the Department of Electrical Engineering Harbin Institute of TechnologyHarbinChina

With the increasing proportion of renewable energy sources(RESs)in power grid,the reserve resource(RR)scarcity for correcting power deviation of RESs has become a potential issue.Consequently,the power curve of RES needs to be more rigorously assessed.The RR scarcity varies during different time periods,so the values of assessment indicators should be dynamically adjusted.The assessment indicators in this paper include two aspects,i.e.,deviation exemption ratio and penalty price.Firstly,this paper proposes a method for dynamically calculating the supply capacity and RR cost,primarily taking into account the operating status of thermal units,forecast information of RES,and load curve.Secondly,after clarifying the logical relationship between the degree of RR scarcity and the values of assessment indicators,this paper establishes a mapping function between them.Based on this mapping function,a dynamic setting method for assessment indicators is proposed.In the future,RES will generally be equipped with battery energy storage systems(BESSs).Reasonably utilizing BESSs to reduce the power deviation of RESs can increase the expected income of RESs.Therefore,this paper proposes a power curve optimization strategy for RESs considering self-owned BESSs.The case study demonstrates that the dynamic setting method of assessment indicators can increase the revenue of RESs while ensuring that the penalty fees paid by RESs to the grid are sufficient to cover the RR costs.Additionally,the power curve optimization strategy can help RESs further increase income and fully utilize BESSs to reduce power deviation.

关键词： renewable energy battery energy storage system(BESS) power curve assessment reserve service parameter setting

An analysis of the implementation of a hybrid renewable-energy system in a building by considering the reduction in electricity price subsidies and the reliability of the grid

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Clean energy 2023年第5期7卷 1125-1135页

作者： Rahmat Adiprasetya Al Hasibi Abdul Haris Department of electrical engineering Universitas Muhammadiyah YogyakartaBantulYogyakarta 55183Indonesia

This article discusses the implementation of a hybrid renewable-energy system to satisfy the electricity requirements of a building.The analysis is based on optimization calculations performed using HOMER software.The components of the simulated hybrid renewable-energy system include photovoltaics,generators powered by biogas,converters and a grid.The input data utilized by the HOMER software are derived from measurements and surveys.The electric load curve is obtained through measurements at the location of the case study.Through surveys,parameters pertaining to the components of the hybrid renewable-energy system were gathered.The analysis was carried out using two sensitivity variables,namely electricity price and grid reliability.On the basis of these two sensitivity variables,optimal system configuration,net present cost,energy cost,return on investment,internal rate of return and payback period were analysed.The results of the analysis indicated that reducing subsidies,which results in higher electricity prices,provided opportuni-ties for economically competitive hybrid renewable-energy systems.With electricity prices of US$0.094/kWh,the return of investment and the internal rate of return increased to 15%and 19%,respectively,and the payback period decreased to 5.3 years.When a hybrid renewable-energy system is implemented in regions with low grid reliability,the same phenomenon occurs.

关键词： renewable energy sensitivity analysis photovoltaic biogas electricity subsidy reliability of the grid

Novel integrated three-port DC/DC converter for different operating modes between renewable energy,electrolyser and fuel cell/battery

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Clean energy 2023年第1期7卷 174-189页

作者： Lilei Jiang Jianxin Qu Lingguo Kong Hejianuig Qian Chuang Liu Guowei Cai Key Laboratory of Modern Power System Simulation and Control&renewable energy Technology Ministry of EducationNortheast Electric Power UniversityJilin 132012China State Grid Harbin Power Supply Company HarbinHeilongjiang ProvinceChina

Due to the slow dynamic power-regulation characteristics of the electrolyser(EL),a novel integrated three-port DC/DC converter topology based on a phase-shifted full-bridge converter and dual active-bridge converter is proposed in this paper.Especially,the proposed converter can achieve a fast auxiliary response to the EL.This topology has the features of single-stage conversion,high system integration and compatibility with multiple operation modes.The operational principles and a hybrid modulation scheme of the proposed converter are analysed in detail.In addition,the power-transmission characteristics of each port and the soft-switching range are researched.On these bases,six operation modes suitable for a hydrogen energy-storage system are designed.The simulation and a 2-kW scaled-down experimental prototype are established to verify the feasibility and effectiveness of the proposed topology in different operation modes.

关键词： renewable energy electrolyser fuel cell three-port DC/DC converter

energy Storage in High Variable renewable energy Penetration Power Systems:Technologies and Applications

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CSEE Journal of Power and energy Systems 2023年第6期9卷 2099-2108页

作者： Huan Zhu Hu Li Guojing Liu Yi Ge Jing Shi Hai Li Ning Zhang State Grid Jiangsu Electric Power Co. LtdNanjingChina Economic Research Institute of State Grid Jiangsu Electric Power Company NanjingChina the State Key Laboratory of Power Systems Department of Electrical EngineeringTsinghua UniversityBeijing 100084China

Integrating variable renewable energy is one of the most effective ways to achieve a low-carbon energy system.The high penetration of variable renewable energy,such as wind power and photovoltaic,increases the challenge of balancing the power system.energy storage technology is regarded as one of the key technologies for balancing the intermittency of variable renewable energy to achieve high penetration.This study reviews the energy storage technology that can accommodate the high penetration of variable renewable energy.The basic energy storage technologies that can accommodate time-scale variation are reviewed first.The role of energy storage in the generation,transmission,distribution,and consumption for the high variable renewable energy penetration system is then analyzed.The supporting energy storage policies in the United States,the United Kingdom and China are summarized.Specific suggestions are proposed from the perspectives of technology,business and policy.This paper provides guidelines for planning energy storage to enable a high variable renewable energy penetration power system.

关键词： Application scenarios energy storage penetration renewable energy supporting policies

renewable energy Transmission by HVDC Across the Continent:System Challenges and Opportunities

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CSEE Journal of Power and energy Systems 2017年第4期3卷 353-364页

作者： Jian Sun Mingjie Li Zhigang Zhang Tao Xu Jingbo He Haijiao Wang Guanghui Li Rensselaer Polytechnic Institute New York12180USA e State Grid Corporation of China Beijing100031China China Electric Power Research Institute Beijing100192China

Rapid development of renewable energy in China is driving a major shift in the characteristics and control requirements of the electricity grid.Since the best renewable energy resources are far away from load centers in the east and southeast,transmission over long distances is required.Over 20 high-voltage DC(HVDC)transmission lines,with a combined capacity exceeding 150 GW,are in operation or are currently under construction.This rapid expansion of new generation and transmission capacities based on power electronics starts to change the characteristics of the grid,especially in areas where they concentrate,creating new stability problems and operational challenges.New system theories and technologies are required to support the development and operation of a future grid that relies more and more on power electronics.This paper highlights the characteristics of power electronics as used in renewable energy generation and HVDC transmission systems,discusses the impacts of these power-electronics-based assets on grid stability and operational requirements,and identifies opportunities for the development of both new system theories and system technologies to support a national energy policy that emphasizes the use of clean energy.

关键词： Grid code high-voltage DC transmission renewable energy system resonance system stability

A Current Perspective on the renewable energy Hydrogen Production Process

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Journal of Thermal Science 2023年第2期32卷 542-596页

作者： ZHOU Jinzhi JI Wenhui CAO Xiaoling HE Wei FAN Jianhua YUAN Yanping School of Mechanical Engineering Southwest Jiaotong UniversityChengdu 610031China Department of Building Environment and Equipment Hefei University of TechnologyHefei 230009China Department of Civil Engineering Technical University of DenmarkBrovej 118Kgs.Lyngby DK 2800Denmark

Hydrogen is a type of clean energy which has the potential to replace the fossil energy for transportation,domestic and industrial applications.To expand the hydrogen production method and reduce the consumption of fossil energy,technologies of using renewable energy to generate hydrogen have been developed widely.Due to the advantages of widespread distribution and various hydrogen production methods,most of the research or review works focus on the solar and biomass energy hydrogen production systems.To achieve a comprehensive acknowledge on the development state of current renewable energy hydrogen production technology,a review on hydrogen production systems driven by solar,wind,biomass,geothermal,ocean and hydropower energy has been presented.The reaction process,energy efficiency,exergy efficiency,hydrogen production rate,economic and environmental performance of these systems have been evaluated.Based on the analysis of these different systems,the challenge and prospects of them are also analyzed.

关键词： hydrogen production renewable energy yield rate energy performance economic and environmental performance

renewable energy in Australia:a wider policy discourse

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Chinese Journal of Population,Resources and Environment 2019年第3期17卷 241-253页

作者： Muyi Yang Suwin Sandu Wenbo Li Muhammad Talal Khalid Centre for energy Policy University of Technology SydneySydneyAustralia Business School Jiangsu Normal UniversityXuzhou JiangsuChina

This paper assesses the evolution of generation technology-mix in Australia,with specific emphasis on understanding how such evolution has been shaped by wider political and socioeconomic influences.This assessment is predicated on the argument that the contemporary,quintessentially techno-economic,policy discourse on renewable energy is deficient,as it ignores climacteric political and socio-economic influences on generation technology-mix.The methodological framework employed in this paper is informed by the core tenets of technological change theory.The assessment suggests that generation technology-mix in Australia has historically been overwhelmingly influenced by the underlying technological paradigm of the electricity industry;and that this technological paradigm essentially draws its imprimatur from the wider political and socio-economic contexts.By implication,it suggests that a rapid uptake of renewables will have widespread ramifications,extending into political,socio-economic and cultural realms of a society.Clearly,existing policy discourse-that tends to focus on technical potentials,cost competitiveness,externalities and risks of various renewable technologies-is deficient.A much broader discourse is needed.This paper also made an attempt to develop a basis for such a discourse by reviewing broader aspects of the Australian society that would be affected by a rapid uptake of renewables.

关键词： Electricity decarbonisation renewable energy policy discourse Australia

Application of non-isolated bidirectional DC-DC converters for renewable and sustainable energy systems:a review

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Clean energy 2023年第2期7卷 293-311页

作者： Tole Sutikno Rizky Ajie Aprilianto Hendril Satrian Purnama Department of Electrical Engineering Universitas Ahmad DahlanYogyakartaIndonesia Embedded Systems and Power Electronics Research Group YogyakartaIndonesia Department of Electrical and Information Engineering Universitas Gadjah MadaYogyakartaIndonesia

The primary challenge in renewable-energy utilization is an energy-storage system involving its power converter.The systems have to promise high efficiency,reliability and durability.Also,all of these can be realized at an economical cost.Buck and boost converters connected in parallel can convert power in both directions.It is the basic non-isolated bidirectional topology commonly used with energy-storage systems.The primary issue with the buck-boost non-isolated bidirectional converter is how to enhance its performance,so the modification involving this topology is still conducted.This paper examines 29 proposed converters from 30 research publications published in the last 10 years,the most recent of which focuses on modified non-isolated bidirectional converters based on the buck-boost topology.These are classified into eight modification schemes,which involve adding new components or circuits to the base topology.Each is evaluated against six parameters:the number of components,control complexity,power-rating applications,soft-switching ability,efficiency outcome and capacity to minimize losses.Moreover,each modified non-isolated bidirectional converter was compared from the renewable-energy-based power-generation-source perspective utilized.Based on these studies,researchers might think of ways to improve the buck-boost converter by changing it to make a new non-isolated bidirectional converter that can be used in systems that need it.

关键词： buck-boost converter bidirectional converter renewable energy energy-storage systems power converter

Situation Awareness and Sensitivity Analysis for Absorption of Grid-connected renewable energy Power Generation Integrating Robust Optimization and Radial Basis Function Neural Network

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Journal of Modern Power Systems and Clean energy 2023年第6期11卷 1795-1803页

作者： Ziqi Zhang Zhong Chen Qi Zhao Yi Wang Jiang Tian School of Electrical Engineering Southeast UniversityNanjingChina Suzhou Power Supply Branch of the State Grid Jiangsu Electric Power Company SuzhouChina NARI Group Corporation Ltd. (State Grid Electric Power Research Institute Ltd.)NanjingChina

The significance of situation awareness(SA) in power systems has increased to enhance the utilization of gridconnected renewable energy power generation(REPG). This paper proposes a real-time calculation architecture based on the integration of robust optimization(RO) and artificial intelligence. First, the time-series simulation of the REPG consumption capacity is carried out under the current grid operating conditions. RO is employed in this simulation, given the randomness of the REPG output and the grid load. Then, the radial basis function neural network(RBFNN) is trained with the results under different parameters using the artificial fish swarm algorithm(AFSA), enabling the neural network(NN) to be the replacement for the time-series simulation model. The trained NN can quickly perceive the REPG absorption situation within the predefined grid structure and period. Moreover, the Sobol' method is adopted to conduct the global sensitivity analysis for different parameters based on the input-output samples obtained by the trained NN. Finally, the simulation experiments based on the modified IEEE 14-bus system prove the real-time performance and accuracy of the proposed SA architecture.

关键词： renewable energy radial basis function neural network robust optimization sensitivity analysis situation awareness