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International market mechanism under Paris Agreement: Insights from China

Energy Procedia 2018年 152卷 829-834页

作者： Shuai Gao Can Wang State Key Joint Laboratory of Environment Simulation and Pollution Control (SKLESPC) and School of Environment Tsinghua University Beijing 100084 China Ministry of Education Key Laboratory for Earth System Modeling Center for Earth System Science Tsinghua University Beijing 100084 China

The international discussion on the design of international market mechanism proposed in Paris agreement is still pending and it is important to add our views to the discussion in the negotiation. It is important to understand companies’ preferences in designing and planning market-based instruments. This paper uses the conjoint analysis to evaluate companies’ preferences for policy alternatives of this mechanism. Data were collected from 81 companies in Shanxi province, China. The results show that companies are most concerned about four policy attributes, policies at the national level, transition of CDM projects, compliance period and flexible mechanism. The ideal policy alternative should distribute directly the tradable units to companies, co-exist with the clean developing mechanism, have longer compliance period and allow companies to bank or borrow the tradable units. The sectors with lower competition level, advanced production technologies and lower energy intensity should be given to priority when taking part in the international market mechanism.

关键词： International market mechanism MSDM Paris agreement Conjoint analysis China

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Extended Disturbance Observer Based Execution Adjustment Estimation Method of Dynamic Demand Response

Extended Disturbance Observer Based Execution Adjustment Est...

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International Conference on control, Automation and Information Sciences (ICCAIS)

作者： Yaqing Zhao Xin Shan Wenjun Bi Ying Wang Kun Yuan Kaifeng Zhang School of Cyber Science and Engineering Southeast University Nanjing China System R&D Center NARI Group Corporation (State Grid Electric Power Research Institute) Nanjing China Key Laboratory of Measurement and Control of CSE Southeast University Nanjing China

ISBN: (数字)9781728123110

ISBN: (纸本)9781728123127

Since Dynamic demand response (DDR) has the characteristics of large quantity and uncertainty, it is difficult to get accurate response power in real time. At the same time, it is very important to know the execution adjustment of DDR accurately and quickly for updating DDR control strategy and frequency regulation of power system. In this paper, we design an extended disturbance observer (EDO) to estimate the execution adjustment of DDR. Firstly, in order to facilitate the design of estimation scheme, a simplified load frequency control (LFC) model is obtained by using model fitting method. Then, by combining the load variation with tie-line power exchange as an extended disturbance, a reduced-order LFC model of power system is derived. Finally, based on the reduced-order LFC model, EDO can be designed by pole-assignment method. The execution adjustment of DDR can be obtained by subtracting the measured value of tie-line power from the estimated value of the observer. From the simulation results of a multi-area LFC control system, the effectiveness of the proposed scheme is demonstrated.

关键词： Frequency control power system dynamics Load modeling Disturbance observers

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Research on Parameter Identification Method of Generator Excitation system Based on Differential Evolution Algorithm

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IOP Conference Series: Materials Science and Engineering 2020年第1期752卷

作者： Nan Li Yuqun Liu Bin Geng Key Laboratory of Modern Power System Simulation and Control and Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin 132012 Jilin Province China College of Electrical Engineering Northeast Electric Power University Jilin 13012 Jilin Province China Jilin Electric Power Co. Ltd. Changchun 130021 Jilin Province China

In order to solve the problem of large parameter identification error caused by nonlinear links of excitation system being triggered easily when transient stability is under fault state, an improved differential evolution algorithm for system parameter identification is proposed by using the characteristic of artificial intelligence algorithm that the nonlinear link is approximated infinitely through optimization. The improvement of the algorithm solves the problems of slow convergence speed, poor fine optimization ability and easily to produce local optimum when classical artificial intelligence algorithm identifies the parameters of non-linear links. At the same time, in order to solve the problem of inaccurate parameters in the whole identification, a decomposition link identification strategy is proposed. The example analysis shows that the algorithm improves the convergence speed, avoids local optimum and improves the convergence accuracy. According to the proposed parameter identification strategy, the excitation system is decomposed and identified, which improves the accuracy of generator excitation system parameter identification, and provides an accurate model and method for power system stability analysis

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Non-communication Protection for Single-Phase-to-Ground Fault Feeder in Neutral Non-Effectively Grounded Distribution system

Non-communication Protection for Single-Phase-to-Ground Faul...

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IEEE General Meeting power& Energy Society

作者： Qi Jia Xinzhou Dong Shenxing Shi Xin He State Key Lab. of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China Power Dispatching Control Center Guizhou Power Grid Co. Ltd Guiyang China

ISBN: (纸本)9781538677049

The traditional non-communication protection for distribution system is only applicable to fault feeders in neutral effectively grounded distribution system or the phase-to-phase fault feeders in neutral non-effectively grounded distribution system. For single-phase-to-ground fault feeders in the latter system, the protection will fail to operate because the magnitude of the current flow in the fault-to-ground connection is too small. To solve this problem, this paper presents a new non-communication protection compatible with the fault detection principle based on comparing the polarities of the initial voltage and current traveling waves. In this technique, when a single-phase-to-ground fault occurs, the relays which detect the fault is in the forward direction will operate based on the conventional time grading coordination at first, after one relay makes tripping decision which has the fastest time setting, the relay on the opposite side will detect the sound phase current changes in a time window to accelerate the operation. Extensive Electromagnetic Transients Program (EMTP) simulation studies with respect to a typical double end feeder system whose neutral is non-effectively grounded show that the proposed technique is able to fast and accurately remove a single-phase-to-ground fault line section from both ends.

关键词： Circuit faults Relays Acceleration Circuit breakers Wavelet transforms EMTP

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Drilling high holes for drilling rig based on complicated working conditions underground coal mine

Drilling high holes for drilling rig based on complicated wo...

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CSAA/IET International Conference on Aircraft Utility systems, AUS 2018

作者： Li, Dongmin Shang, Mengquan Zhang, Yanqiang Li, Jia Ma, Guofang Department of Mechanical and Electronic Engineering Shandong University of Science and Technology Tai'an Shandong province China State Key Laboratory of Fluid Power and Mechatromc System Zhejiang University Hangzhou Zhejiang province China State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province Ministry of Science and Technology Qingdao Shandong province China

ISBN: (纸本)9781785617911

In order to improve the performance of the current goods handling equipment for the airplane, a drilling rig is designed to meet with the complicated working conditions Meanwhile the drilling rig can be applied in the operation of gas drainage for the high holes underground coal mine According to the actual working conditions on the operation of gas drainage for medium or thick coal seam, the drilling rig for drilling high holes is designed based on the structure and working princfple of the current drilling rig, and the hydraulic power unit is arranged separately, and 2 two-stage telescopic hydraulic cylinders are controlled respectively to adjust the height of drilling hole and the dip angle of drilling hole. Furthermore the characteristics of the supporting speed is simulated and analyzed with AMESim, thus the results show that the drilling rig can satisfy the requirement of drilling high holes and goods handling equipment for the airplane. © 2018 IET Conference Publications. All rights reserved.

关键词： Coal mines

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Misalignment fault detection in dual-rotor system based on time frequency techniques

Misalignment fault detection in dual-rotor system based on t...

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Society for Machinery Failure Prevention Technology Annual Conference 2017: 50 Years of Failure Prevention Technology Innovation, MFPT 2017

作者： Wang, Nan-Fei Jiang, Dong-Xiang Han, Te State Key Laboratory of Control Simulation of Power System and Generation Equipment Department of Thermal Engineering Tsinghua University Beijing100084 China

In order to improve the energy efficiency and compact structure, the dual-rotor structure including lowpressure rotor and high-pressure rotor has been widely used in aero-engine. Misalignment is one of the most common faults in dual-rotor system, which will causes malfunctions. It is a significant task for rotor dynamics personnel to monitor and defect faults in dual-rotor system. In the paper, the dual-rotor vibration signals are applied to solve the fault identification problem by utilizing time frequency techniques. Numerical simulations are carried out through finite element analysis of dual-rotor system with misalignment fault. Two signal processing tools namely Short Time Fourier Transform (STFT) and Continuous Wavelet Transform are used to detect the misalignment fault and compared to evaluate their diagnosis performance. The effect of addition of Signal to Noise (SNR) on three frequency techniques is presented. Experiments are carried out to obtain the vibration data of dual-rotor test rig and the results from the work show that the technique can be used for the monitoring of misalignment, which will have applications in the condition monitoring and maintenance of various types of rotating machinery.

关键词： Condition monitoring

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power and energy balance of active distribution network considering operation-control strategy

Power and energy balance of active distribution network cons...

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IEEE Conference on Energy Internet and Energy system Integration (EI2)

作者： Lin Cheng Ning Qi Lingxiao Wei Shaojun Xu Qingshi Liu State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Tsinghua University Beijing China State Grid Beijing electric power company Beijing China

With the rapid deelopment of demand-side response and active distribution network, the new method to power and energy balance is becoming more and more important. In this paper, the architecture of power and energy balance in active distribution network is proposed, which consists of three parts: load and generation forecasting, power and energy balance. Moreover, capacity-load ratio guidance is modified combined with the peak shaving potential and trusted capacity. Besides, the energy balance method considering the operation-control of distributed energy is proposed. Finally, through numerical analysis, the feasibility and practicability of the model are verified.

关键词： Planning Forecasting Load forecasting Distributed power generation Dispatching Load modeling Capacity planning

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Satellite-based estimates of decline and rebound in China’s CO2 emissions during COVID-19 pandemic

arXiv

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arXiv 2020年

作者： Zheng, Bo Geng, Guannan Ciais, Philippe Davis, Steven J. Martin, Randall V. Meng, Jun Wu, Nana Chevallier, Frederic Broquet, Gregoire Boersma, Folkert van Der, Ronald A. Lin, Jintai Guan, Dabo Lei, Yu He, Kebin Zhang, Qiang Laboratoire des Sciences du Climat et de l'Environnement CEA-CNRS-UVSQ Gif-sur-Yvette France Ministry of Education Key Laboratory for Earth System Modeling Department of Earth System Science Tsinghua University Beijing China State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing China Department of Earth System Science University of California Irvine IrvineCA United States Department of Energy Environmental & Chemical Engineering Washington University in St.Louis St. LouisMO United States Department of Physics and Atmospheric Science Dalhousie University HalifaxNS Canada Harvard-Smithsonian Center for Astrophysics CambridgeMA United States De Bilt Netherlands Environmental Sciences Group Wageningen University Wageningen Netherlands Laboratory for Climate and Ocean-Atmosphere Studies Department of Atmospheric and Oceanic Sciences School of Physics Peking University Beijing China Chinese Academy of Environmental Planning Beijing China

Changes in CO2 emissions during the COVID-19 pandemic have been estimated from indicators on activities like transportation and electricity generation. Here, we instead use satellite observations together with bottom-up information to track the daily dynamics of CO2 emissions during the pandemic. Unlike activity data, our observation-based analysis can be independently evaluated and can provide more detailed insights into spatially-explicit changes. Specifically, we use TROPOMI observations of NO2 to deduce ten-day moving averages of NOx and CO2 emissions over China, differentiating emissions by sector and province. Between January and April 2020, China’s CO2 emissions fell by 11.5% compared to the same period in 2019, but emissions have since rebounded to pre-pandemic levels owing to the fast economic recovery in provinces where industrial activity is concentrated. Copyright © 2020, The Authors. All rights reserved.

关键词： Nitrogen oxides

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The electricity-water nexus in Chinese electric trade system

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Energy Procedia 2018年 152卷 247-252页

作者： Jiake Fang Saige Wang Yiyi Zhang Bin Chen Guangxi Key Laboratory of Power System Optimization and Energy Technology Guangxi University Nanning Guangxi 530004 China Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Beijing Normal University Beijing 100875 P.R. China

A great amount of electricity generation exerts a tremendous pressure on China's water resources. The spatial mismatch between primary energy and water in China aggravates the pressure of water resources and results in virtual water transfers from drier to wetter regions through electricity trade. Firstly, we construct an electricity generation-consumption (EGC) model to model inter-provincial electricity trade in China and propose a hybrid virtual water intensity (HVWI) indicator to represent the provincial overall virtual water consumption factor. Then, we combine the inter-provincial electricity trade and the provincial HVWI to build China's virtual water trade network. The results show that total inter-provincial virtual water embodied in the electricity trade is 5637 GL. The top three largest electricity trade flows are Yunnan-to-Guangdong (111 billion kWh), Inner Mongolia-to-Beijing (32.7 billion kWh) and Inner Mongolia-to-Liaoning (31.1 billion kWh), and the top three largest virtual water flows are Yunnan-to-Guangdong (1527 GL), Sichuan-to-Chongqing (432.6 GL) and Sichuan-to-Shanghai (418.7 GL).

关键词： Electricity trade virtual water electricity-water nexus electricity management

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The impacts of interprovincial agricultural trade on water resources in China: from perspective of grey water footprint

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Energy Procedia 2018年 152卷 253-258页

作者： Changyi Liao Saige Wang Jiake Fang Yiyi Zhang Guangxi Key Laboratory of Power System Optimization and Energy Technology Guangxi University Nanning Guangxi 530004 China Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Beijing Normal University Beijing 100875 P.R. China

As the largest water consumption sector, agriculture sector plays a significant role in water resources reallocating via economic trade. Different from previous studies focusing on the impacts of economic trade on water quantity, this paper concentrates on the impacts on the water quality. Grey water footprint (GWF) of agricultural sector is used for investigating the impacts of trade on water resources. In this paper, the regional virtual grey water of agricultural trade network was built based on the GWF and multiregional input–output analysis. The GWF for agricultural sector in each region was inventoried. Then GWF of agriculture embodied in monetary flows among regions were calculated using multiregional input–output analysis. The main results showed that Shandong, Henan, Heilongjiang, Inner Mongolia, and Hebei were the most critical regions for water resources. Besides, Zhejiang and Guangdong have saved a large amount of water by importing water resources through agricultural trade. While, Hebei, Heilongjiang, Anhui, Henan and Xinjiang are exporting a large amount of water resources. Moreover, the regions with developed economy and higher population are more dependent on agricultural imports. By identifying the critical node and pathway in virtual grey water trade, this paper aims to provide theoretical foundations for mitigating water pressure and reducing water pollution in economic trade activities.

关键词： Agricultural sector grey water footprint multiregional input-output analysis water polllution

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