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Integrated water resource security evaluation of Beijing based on grey relation analysis and TOPSIS

Integrated water resource security evaluation of Beijing bas...

引用

5th Biennial Conference of the International Environmental Modelling and Software Society: Modelling for Environment's Sake, iEMSs 2010

作者： Dai, Jing Chi, Jingjing Chen, Bin Ju, Liping State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Beijing Normal University Beijing 100875 China State Key Laboratory of Turbulence and Complex Systems Peking University Beijing 100871 China

ISBN: (纸本)9788890357411

Security evaluation has become a hot topic in the research field of water resource management. In this paper, we established a novel water resource security indicator system based on the Pressure-Status-Response (PSR) framework using grey relation analysis and technique for order preference by similarity to ideal solution (TOPSIS). A case study of Beijing from 1996 to 2007 was conducted to verify the evaluation system. Results showed that the grey relative closeness degrees of water resource security to the positive ideal solution were low, with the least one of 0.360 in 1999 and largest one of 0.527 in 2007, implying that Beijing was facing severer challenges with water resources during the concerned time. Also, the analysis of water resource security indicated that the pressure of water resource was constantly increasing. Finally, factor analysis was employed to calculate the grey relation degrees of evaluating indices with the ideal solutions so as to reveal the relativity of water resource security of Beijing, which may contribute to a better understanding of the urban water resource management and regulation.

关键词： Factor analysis

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Single phase grounding fault location based on frequency domain characteristics of fault current

Single phase grounding fault location based on frequency dom...

引用

2011 International Conference on Advanced power System Automation and Protection, APAP 2011

作者： Jiang, Bo Shi, Shenxing Dong, Xinzhou Wang, Bin State Key Lab. of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing 100084 China

ISBN: (纸本)9781424496198

This paper studies the fault current frequency spectrum characteristics of single phase ground fault in ungrounded distribution networks, and the fault location method based on it. Firstly, it analyzes the production mechanism of 2nd major frequency component, and the relationship between the 2nd major frequency component and series resonance frequency of the faulted line. Secondly, from the perspectives of lumped-parameter circuit, the relationship between 2nd major frequency component and fault location is deduced. simulation cases are used to confirm the relationship. Last, the impact of load and initial fault phase angle on the 2nd major frequency component are researched. simulation research proves the feasibility of the fault detection and location method based on frequency domain characteristics. © 2011 IEEE.

关键词： Electric fault location

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Influence Analysis of Thermal states on Dynamic Frequency Response for power systems with High Renewables

Influence Analysis of Thermal States on Dynamic Frequency Re...

引用

2020 IEEE Sustainable power and Energy Conference, iSPEC 2020

作者： Cao, Yongji Zhang, Hengxu Li, Changgang Sun, Leshu Li, Chen Qin, Hao Guo, Qi Zhu, Yihua Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education Shandong University Jinan250061 China State Key Laboratory of HVDC Electric Power Research Institute National Energy Power Grid Technology RD Centre Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou510663 China

ISBN: (纸本)9781728191645

As thermal generators are substituted by renewables, the power reserves are decreasing and the influence of boiler thermal states on frequency dynamics becomes more severe. The variations of thermal states can aggravate dynamic frequency response, especially for power systems with high renewables. However, the system frequency response (SFR) model has been widely adopted, but in which the thermal states are neglected. This paper analyzes the influence of thermal states on dynamic frequency response quantitatively. The modified SFR models are built by extending the boiler models with different simplification degrees. Then, from the view of the response amplitude and time, the quantitative indices are established to measure the response trajectories of modified SFR models. And the characteristics of frequency dynamics and the statistic indices of data sequences are utilized to analyze the influences of thermal states and assess the performances of modified SFR models. According to the results of comparative analysis, the neglect of thermal states incurs more optimistic frequency dynamics and impairs the frequency stability of power systems with high renewables. Additionally, the accuracy of the SFR model can be enhanced even with the most simplified boiler model. © 2020 IEEE.

关键词： Frequency response

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Nanosecond-pulse dielectric barrier discharge using magnetic compression solid-state pulsed power

Nanosecond-pulse dielectric barrier discharge using magnetic...

引用

IEEE International power Modulator and High Voltage Conference

作者： Shao, Tao Yu, Yang Zhang, Cheng Niu, Zheng Zhang, Dongdong Wang, Jue Sun, Yaohong Yan, Ping Zhou, Yuanxiang Institute of Electrical Engineering Chinese Academy of Sciences Beijing 100190 China State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments Electrical Engineering Department Tsinghua University Beijing 100084 China

ISBN: (纸本)9781424471294

Dielectric barrier discharge excitated by unipolar pulsed power is a promising approach for producing non-thermal plasma at atmospheric pressure. A magnetic compression solid-state pulse power generator is used to produce dielectric barrier discharge (DBD). The generator is capable of providing repetitive pulses with the voltage of up to 30 kV and duration of 70 ns at a 300 resistive load. This paper illustrates electrical characteristic and luminous emissions of DBD excitated by repetitive unipolar nanosecond-pulses in atmospheric air. Different from common DBD excitated by high-voltage AC sources, discharge current of DBD in the experimental investigation can be on an order of tens of amperes. When the DBD is created using two liquid electrodes, the luminous emissions from the obverse and flank sides of liquid electrodes show that no filament is observed and the discharge is homogeneous and diffuse in the whole discharge regime. © 2010 IEEE.

关键词： Dielectric barrier discharge

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Robust control of Bidirectional power Converter in an AC/DC Hybrid Microgrid Based on the H∞Tracking Problem 4

Robust Control of Bidirectional Power Converter in an AC/DC ...

引用

4th International Conference on power and Energy Technology, ICPET 2022

作者： Guo, Tianyu Guo, Haiping Luo, Chao Miao, Lu Huang, Libin State Key Laboratory of Hvdc Electric Power Research Institute China Southern Power Grid China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China China Southern Power Grid Csg Key Laboratory for Power System Simulation Electric Power Research Institute Guangzhou China Electric Power Dispatching and Control Center of Guangdong Power Grid Guangzhou China

ISBN: (数字)9781665480796

ISBN: (纸本)9781665480796

The bidirectional power converter (BPC) in the ac/dc hybrid microgrid plays a vital role in maintaining the dynamic balance of power in the microgrid, achieving mutual support of power between the AC and the DC areas, and improving the power quality. In view of this, this paper proposes a robust control method for BPC in the ac/dc hybrid microgrid based on the H∞ tracking problem. First, based on the superposition theorem, the voltage control problem of the ac/dc hybrid microgrid is converted into a H∞ tracking problem for solution, and the robust controller is mathematically proved to exist stably. Then, the designed H∞ robust controller is reduced based on the principle of optimal Hankel norm approximation reduction. Finally, the simulation model is built based on the MATLAB/Simulink to verify the correctness and effectiveness of the proposed method. © 2022 IEEE.

关键词： Robust control

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A novel fault locator for power distribution system with neutral non-effectively grounded

A novel fault locator for power distribution system with neu...

引用

2011 International Conference on Advanced power System Automation and Protection, APAP 2011

作者： Shi, Shenxing Dong, Xinzhou State Key Lab. of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing 100084 China

ISBN: (纸本)9781424496198

Fault locator for power distribution system with neutral non-effectively grounded should locate phase-to-phase fault and single-phase-to-ground fault respectively. For phase-to-phase fault, the point can be located by power-frequency impedance. However, for single-phase-to-ground fault with limited power-frequency current not more than load current, a novel fault location technology should be developed. The paper will present a practical single-phase-to-ground fault location based on fault generated traveling waves acquired from one phase current transducer and zero sequence current transducer at first. Then implementation of the novel fault locator is proposed including hardware design and software flowchart. At last field tests will be made to verify the feasibility of the fault locator. © 2011 IEEE.

关键词： Transducers

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Test and Assessment of Grid Forming Wind Turbine based on controller Hardware-in-the-Loop 5

Test and Assessment of Grid Forming Wind Turbine based on Co...

引用

5th IEEE Conference on Energy Internet and Energy System Integration, EI2 2021

作者： Qi, Chen Qin, Shiyao Miao, Fenglin Li, Shaolin Wang, Ruiming State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute Beijing China

ISBN: (纸本)9781665434256

The grid forming wind turbine technology provides a solution to the future power grid in China dominated by new energy sources. With China's first grid forming DFIG wind turbine successfully operated in Zhangbei Wind power Test Base, the test and assessment methods should be investigated to validate and understand its behaviors. In this work, the grid forming control technique adopted in the prototype wind turbine is first introduced. Then, a high fidelity controller hardware-in-the-loop platform is constructed as an approach for testing and assessment Two capabilities of the grid forming wind turbine are mainly validated, including weak grid operation and primary frequency response. Finally, the tests are conducted in the modeled system, where the strengths and potential problems of the grid forming wind turbine are identified. This work presents a viable option for the test and assessment of the grid forming wind turbine, and is expected to help the industry to reach a consensus on its operation and characteristics. © 2021 IEEE

关键词： Wind turbines

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Uncertainty Analysis of Wind power Based on Operating Data 4

Uncertainty Analysis of Wind Power Based on Operating Data

引用

4th International Conference on Energy, Electrical and power Engineering, CEEPE 2021

作者： Huang, YueHui Li, Pai Sun, YaNan State Key Laboratory of Operation and Control of Renewable Energy Storage Systems China Electric Power Research Institute BeiJing China

ISBN: (纸本)9781665433631

The uncertainty of wind power prediction has a serious impact on the stable operation of power system. In this paper, the actual operation data of 200 wind farms in a certain area of China are collected, and the wind farm stations are divided into different scale station clusters according to the integration location of the grid. The distribution characteristics of wind power prediction error of station clusters are analyzed. Then, based on the prediction error and power correlation characteristics, a clustering segmentation prediction error analysis method is proposed. Finally, the nonparametric kernel density estimation is used to fit the prediction error of station cluster, and the fitting precision evaluation indexes are compared to verify the applicability and effectiveness of the proposed method for the prediction error distribution of station cluster. © 2021 IEEE.

关键词： Uncertainty analysis

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Comprehensive Evaluation Technology of Photovoltaic power Station power Generation Performance Based on Minimum Deviation Combined Weighting Method 6

Comprehensive Evaluation Technology of Photovoltaic Power St...

引用

6th IEEE Conference on Energy Internet and Energy System Integration, EI2 2022

作者： Zhang, Jian Xu, Lianghui Xia, Lie Yang, Qingbin Chen, Zhilei Dong, Wei China Electric Power Research Institute State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems Beijing China

ISBN: (纸本)9798350347159

In order to further optimize resource structure, reduce the energy gap, alleviate environmental pollution and promote the sustainable development of the whole social energy system, the scientific evaluation and decision-making mechanism of photovoltaic power generation projects need to be established, and the comprehensive evaluation system of photovoltaic power station power generation performance need to be improved. This paper focuses on the comprehensive evaluation system and evaluation method of photovoltaic power generation units. Based on the basic principle of multi-objective, multi-criteria, multi-factors and multi-level decision-making, a comprehensive evaluation system suitable for photovoltaic power generation units is proposed, which considers the advantages and disadvantages of objective weight method and subjective weight method. The minimum deviation combined weighting method is used to calculate the combined weight, and then the comprehensive performance evaluation model of photovoltaic power generation unit is established. The comprehensive evaluation results of the new photovoltaic medium voltage power generation unit and the conventional photovoltaic power generation unit are compared and analyzed, so as to prove the superiority of the design index of the former. © 2022 IEEE.

关键词： Sustainable development

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Accurate flux observer based on distributed multi-processor in MV adjustable speed drive systems

Accurate flux observer based on distributed multi-processor ...

引用

ICEMS 2005: 8th International Conference on Electrical Machines and systems

作者： Shu, Liu Jianzheng, Liu Zhengming, Zhao Liqiang, Yuan Hua, Bai Haitao, Zhang Department of Electrical Engineering and Applied Electronic Technology State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing 100084 China

ISBN: (纸本)7506274078

This paper presents an accurate flux observer used in distributed multi-processor (DMP) adjustable speed drive systems. The stator flux linkage is estimated with a full-order observer, while the rotor speed is identified by using Lyapunov theorem. In order to improve the system performance in a wide speed range, the stator resistance is estimated simultaneously. In this paper, the structure of the DMP system, the principle of the full-order observer and the method for identifying the rotor speed and state resistance are all described in details. Relevant simulation results based on MATLAB/SIMULINK are given to prove the performance of the method. Experiments of a real system also verify the feasibility of this scheme.

关键词： Microprocessor chips

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