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Thermo-economic analysis of a direct supercritical CO electric power generation system using geothermal

《能源前沿（英文）》 2022年第16卷第2期页码 246-262 doi: 10.1007/s11708-021-0749-9

摘要： A comprehensive thermo-economic model combining a geothermal heat mining system and a direct supercritical CO₂ turbine expansion electric power generation system was proposed in this paper. Assisted by this integrated model, thermo-economic and optimization analyses for the key design parameters of the whole system including the geothermal well pattern and operational conditions were performed to obtain a minimal levelized cost of electricity (LCOE). Specifically, in geothermal heat extraction simulation, an integrated wellbore-reservoir system model (T2Well/ECO2N) was used to generate a database for creating a fast, predictive, and compatible geothermal heat mining model by employing a response surface methodology. A parametric study was conducted to demonstrate the impact of turbine discharge pressure, injection and production well distance, CO₂ injection flowrate, CO₂ injection temperature, and monitored production well bottom pressure on LCOE, system thermal efficiency, and capital cost. It was found that for a 100 MW_e power plant, a minimal LCOE of $0.177/kWh was achieved for a 20-year steady operation without considering CO₂ sequestration credit. In addition, when CO₂ sequestration credit is $1.00/t, an LCOE breakeven point compared to a conventional geothermal power plant is achieved and a breakpoint for generating electric power generation at no cost was achieved for a sequestration credit of $2.05/t.

关键词： geothermal heat mining supercritical CO₂ power generation thermo-economic analysis optimization

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Overview of condition monitoring and operation control of electric power conversion systems in direct-drive

Shoudao HUANG, Xuan WU, Xiao LIU, Jian GAO, Yunze HE

《机械工程前沿（英文）》 2017年第12卷第3期页码 281-302 doi: 10.1007/s11465-017-0442-1

摘要：

Electric power conversion system (EPCS), which consists of a generator and power converter, is one of the most important subsystems in a direct-drive wind turbine (DD-WT). However, this component accounts for the most failures (approximately 60% of the total number) in the entire DD-WT system according to statistical data. To improve the reliability of EPCSs and reduce the operation and maintenance cost of DD-WTs, numerous researchers have studied condition monitoring (CM) and fault diagnostics (FD). Numerous CM and FD techniques, which have respective advantages and disadvantages, have emerged. This paper provides an overview of the CM, FD, and operation control of EPCSs in DD-WTs under faults. After introducing the functional principle and structure of EPCS, this survey discusses the common failures in wind generators and power converters; briefly reviewed CM and FD methods and operation control of these generators and power converters under faults; and discussed the grid voltage faults related to EPCSs in DD-WTs. These theories and their related technical concepts are systematically discussed. Finally, predicted development trends are presented. The paper provides a valuable reference for developing service quality evaluation methods and fault operation control systems to achieve high-performance and high-intelligence DD-WTs.

关键词： direct-drive wind turbine electric power conversion system condition monitoring fault diagnosis operation control under faults fault tolerance

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Availability growth models and verification of power equipment

Jinyuan SHI, Jiamin XU

《能源前沿（英文）》 2021年第15卷第2期页码 529-538 doi: 10.1007/s11708-019-0624-0

摘要： The general availability growth models for large scale complicated repairable system such as electric generating units, power station auxiliaries, and transmission and distribution installations are presented. The calculation formulas for the maintenance coefficient, mathematical expressions for general availability growth models, ways for estimating, and fitting on checking the parameters of the model are introduced. Availability growth models for electric generating units, power station auxiliaries, and transmission and distribution installations are given together with verification examples for availability growth models of 320–1000 MW nuclear power units and 1000 MW thermal power units, 200–1000 MW power station auxiliaries, and 220–500 kV transmission and distribution installations. The verification results for operation availability data show that the maintenance coefficients for electric generating units, power station auxiliaries, transmission and distribution installations conform to the power function, and general availability growth models conform to rules of availability growth tendency of power equipment.

关键词： repairable system power equipment electric generating unit power station auxiliary transmission and distribution installation reliability availability availability growth model

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Powertrain control of a solar photovoltaic-battery powered hybrid electric vehicle

P. PADMAGIRISAN, V. SANKARANARAYANAN

《能源前沿（英文）》 2019年第13卷第2期页码 296-306 doi: 10.1007/s11708-018-0605-8

摘要： This paper proposes a powertrain controller for a solar photovoltaic battery powered hybrid electric vehicle (HEV). The main objective of the proposed controller is to ensure better battery management, load regulation, and maximum power extraction whenever possible from the photovoltaic panels. The powertrain controller consists of two levels of controllers named lower level controllers and a high-level control algorithm. The lower level controllers are designed to perform individual tasks such as maximum power point tracking, battery charging, and load regulation. The perturb and observe based maximum power point tracking algorithm is used for extracting maximum power from solar photovoltaic panels while the battery charging controller is designed using a PI controller. A high-level control algorithm is then designed to switch between the lower level controllers based on different operating conditions such as high state of charge, low state of charge, maximum battery current, and heavy load by respecting the constraints formulated. The developed algorithm is evaluated using theoretical simulation and experimental studies. The simulation and experimental results are presented to validate the proposed technique.

关键词： battery management system hybrid electric vehicles (HEVs) maximum power point tracking (MPPT) solar photovoltaic

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超导磁储能系统在舰船电力系统中的应用前景及其关键课题

戴陶珍,范则阳,李敬东,唐跃进,程时杰

《中国工程科学》 2002年第4卷第6期页码 16-19

摘要：

现代舰船电力系统容量急剧增大，全电力舰船的实现、敏感负荷和新概念武器的引入使舰船电力系统面临着一系列挑战。介绍了超导磁储能系统（SMES）作为一种新型储能设备的应用研究进展，分析了SMES在舰船电力系统中的潜在应用，最后提出了舰船电力系统中应用SMES的关键课题。

关键词：舰船电力系统超导磁储能系统（SMES）超导应用

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21世纪电力工业的一个重要发展方向——超导电力技术

唐跃进,李敬东,段献忠,程时杰,潘垣

《中国工程科学》 2000年第2卷第4期页码 1-7

摘要：

随着人们对环境与资源保护意识的增强，对生活方式的改善以及信息化社会的发展，对电力系统的经济性、供电可靠性、供电质量、供电容量和密度将提出更高的要求。对于这些要求，仅用常规技术是很难适应社会的进步对电力系统的需求的。在21世纪，迫切希望电力工业开展重大的技术革新，超导技术的应用，将是电力工业在21世纪的重要发展方向。文章系统地分析了未来电力工业所面临的困难和课题，论述了超导应用技术在未来电力系统中的地位，并简要地介绍了超导电力技术的发展现状。

关键词：超导应用电力系统环境与资源

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超导电力装置失超检测的基础研究

喻小艳,李敬东,唐跃进

《中国工程科学》 2003年第5卷第10期页码 73-77

摘要：

超导电力装置的失超会影响超导电力设备的运行和安全，是超导电力设备技术实用化有待深入研究的一个重要问题。对国内外通用的超导装置失超检测方法进行了分析，并根据电力系统中超导装置失超检测的特点，对高温超导线材在不同幅值的动态电流作用下的失超特性进行了试验研究，通过对试验数据的分析，对高温超导线材的失超特性有了较精细的理解，并在此基础上提出了超导电力装置失超先兆检测及其失超保护设计的新概念。

关键词：超导装置失超检测超导电力系统先兆预测

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风氢互补发电系统构建初探

徐晔,陈晓宁

《中国工程科学》 2010年第12卷第11期页码 83-88

摘要：

为了解决风力发电输出功率的不平稳性和电压的波动性，以解决并网的瓶颈问题，提出风氢互补发电系统，将风力发电输出“波谷”对应的可控出力作为风电场能保证恒定输出的功率，“波峰”至“波谷”之间对应的不可控的出力，采用“波峰”制氢进行“削峰”、“波谷”氢气发电进行“填谷”的方式进行平衡。并以如东风电场为例进行了实例分析与计算，结果证明采用该风氢互补系统基本能保证发电输出平衡，是解决风电并网有效可行的途径。

关键词：风力发电氢能发电制氢储氢

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构建以新能源为主体的新型电力系统框架研究

舒印彪,陈国平,贺静波,张放

《中国工程科学》 2021年第23卷第6期页码 61-69 doi: 10.15302/J-SSCAE-2021.06.003

摘要：

构建以新能源为主体的新型电力系统，既是我国电力系统转型升级的重要方向，也是实现碳达峰、碳中和目标的关键途径。本文分析了电力系统转型带来的变化、问题及挑战，阐述了新型电力系统的内涵、构建原则与思路；根据电力系统发展的技术特征、新能源接入规模，合理划分新型电力系统的发展阶段并针对性提出各阶段的发展建议。研究认为，新型电力系统以新能源为电能供给主体，可满足不断增长的清洁用电需求，兼具高度的安全性、开放性、适应性；相关系统构建是一项系统性工程，应遵循电力系统的技术演进规律与特征，充分利用成熟技术、存量系统并深入挖掘潜力，同步着力研发新兴技术，积极稳妥并循序渐进实施重大转型。

关键词：新型电力系统碳达峰碳中和新能源电力转型

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我国电站仿真技术进展与建模理论研究

吕崇德,范永胜,蔡瑞忠

《中国工程科学》 1999年第1卷第1期页码 99-103

摘要：

对我国电站仿真技术的发展过程与建模理论的研究进行了论述和分析，重点阐述了20年来火电机组仿真技术从科学研究到产业化和使我国火电仿真机数量上跃居世界第一位、质量上达到世界先进水平的进展过程，给出了我国电力仿真机的分布情况；综述了我国电站系统仿真的核心技术——热工对象的建模理论和技术的研究状况，分析了集总参数模型、分布参数模型和高精度集总参数动态修正模型等不同的建模方法应用于不同的仿真对象和仿真目的。

关键词：系统仿真建模电力

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Decoupling optimization of integrated energy system based on energy quality character

Shixi MA, Shengnan SUN, Hang WU, Dengji ZHOU, Huisheng ZHANG, Shilie WENG

《能源前沿（英文）》 2018年第12卷第4期页码 540-549 doi: 10.1007/s11708-018-0597-4

摘要：

Connections among multi-energy systems become increasingly closer with the extensive application of various energy equipment such as gas-fired power plants and electricity-driven gas compressor. Therefore, the integrated energy system has attracted much attention. This paper establishes a gas-electricity joint operation model, proposes a system evaluation index based on the energy quality character after considering the grade difference of the energy loss of the subsystem, and finds an optimal scheduling method for integrated energy systems. Besides, according to the typical load characteristics of commercial and residential users, the optimal scheduling analysis is applied to the integrated energy system composed of an IEEE 39 nodes power system and a 10 nodes natural gas system. The results prove the feasibility and effectiveness of the proposed method.

关键词： integrated energy system energy quality character optimization electric power system natural gas system

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RETRACTED ARTICLE: Using a Newton-type technique for smart meters estimation frequency of electric powersystem

Tanveer AHMAD,Qadeer UI HASAN

《能源前沿（英文）》 2016年第10卷第4期页码 489-489 doi: 10.1007/s11708-016-0395-9

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Sizing of hybrid PMSG-PV system for battery charging of electric vehicles

M. M. RAJAN SINGARAVEL,S. ARUL DANIEL

《能源前沿（英文）》 2015年第9卷第1期页码 68-74 doi: 10.1007/s11708-015-0349-7

摘要： The number of electric vehicles are increasing in the society as they are considered as zero emission vehicles and also because conventional fuels are becoming expensive. Additional electrical power should be produced to meet the energy requirement of this increase in electric vehicle population. To use the existing grid infrastructure without any failure, installing distributed generator at secondary distribution network is essential. In this work, sizing of wind-driven permanent magnet synchronous generator—photovoltaic hybrid distributed generating system has been attempted to meet the energy demand of electric vehicles of a particular residential area. Different feasible combinations for wind generator capacity and photovoltaic capacity are obtained to satisfy the additional energy requirement. Results are analyzed based on energy, financial payback periods and daily power profile of the hybrid system. Based on this analysis, the sizes of wind generator and photovoltaic array have been chosen to meet the energy demand of electric vehicles of that particular residential locality.

关键词： electric vehicles hybrid PMSG-PV system smart grid

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电缆测温系统在工厂供配电系统中的应用

阎红

《中国工程科学》 2007年第9卷第11期页码 172-174

摘要：

探讨了在工矿企业中10kV高压电力电缆在线运行温度检测的必要性与实际应用；列举了感温元件的选型方法以及温度监测系统的组成与运行；介绍了信息处理软件和故障诊断专家系统软件、电力设备底层信息网、现场总线技术在电力系统中的应用；实现了不停电状态下对高压电缆及电缆接头等各种电缆的故障在线监测及诊断功能。

关键词： 10kV高压电力电缆终端头温度传感器监测系统

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Impact evaluation of large scale integration of electric vehicles on power grid

Rabah BOUDINA, Jie WANG, Mohamed BENBOUZID, Farid KHOUCHA, Mohamed BOUDOUR

《能源前沿（英文）》 2020年第14卷第2期页码 337-346 doi: 10.1007/s11708-018-0550-6

摘要： As the world witnesses a continual increase in the global energy demand, the task of meeting this demand is becoming more difficult due to the limitation in fuel resources as well as the greenhouse gases emitted which accelerate the climate change. As a result, introducing a policy that promotes renewable energy (RE) generation and integration is inevitable for sustainable development. In this endeavor, electrification of the transport sector rises as key point in reducing the accelerating environment degradation, by the deployment of new type of vehicles referred to as PHEV (plug-in hybrid electric vehicle). Besides being able to use two kinds of drives (the conventional internal combustion engine and the electric one) to increase the total efficiency, they come with a grid connection and interaction capability known as the vehicle-to-grid (V2G) that can play a supporting role for the whole power system by providing many ancillary services such as energy storage mean and power quality enhancer. Unfortunately, all these advantages do not come alone. The uncontrolled large scale EV integration may present a real challenge and source of possible failure and instability for the grid. In this work the large scale integration impact of EVs will be investigated in details. The results of power flow analysis and the dynamic response of the grid parameters variation are presented, taking the IEEE 14 bus system as a test grid system.

关键词： PHEV vehicle-to-grid (V2G) technical impact IEEE 14 bus power flow analysis