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Conference on Electrical Insulation and Dielectric Phenomena, (CEIDP)

作者： Yunxiao Zhang Yuanxiang Zhou Ling Zhang Chenyuan Teng Zhongliu Zhou Meng Huang State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Tsinghua University Beijing China The Wind Solar Storage Division of State Key Laboratory of Power System and Generation Equipment School of Electrical Engineering Xinjiang University Urumqi China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing China

Electrical tree is one of the major issues for insulation failure in high-voltage direct current (HVDC) cable. In this paper, electrical tree initiation and growth characteristics of silicone rubber (SIR) are studied by optical tree observation system under DC and AC voltage with varied temperature. Moreover, tree channels are pictured and analyzed by 3D fluorescence imaging technology. Results show that the average tree initiation voltage, whether DC or AC, decreases exponentially with increasing temperature. However, the initiation voltage under positive DC voltages is much higher than that under AC voltages. AC tree growth pattern could be roughly divided into two modes: bush-like growing pattern and pine-like growing pattern, while DC trees stop growing after voltage stabilizes. 3D fluorescence tests show that DC tree branches are sparser and the channels are thinner. Based on the trap theory, mechanism of DC electrical tree in SIR is clarified. It is believed that different charge transport dynamics are the main reason for the differences in electrical tree behavior under DC and AC voltages.

关键词： Three-dimensional displays Temperature Shape HVDC transmission Conferences Fluorescence Space charge

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Coordinated control strategy of a DC grid with energy storage system

Coordinated control strategy of a DC grid with energy storag...

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作者： Yang, Bo Sang, Bingyu Yang, Zhihan Li, Menbo Xiang, Wang Lu, Xiaojun Yao, Liangzhong Tao, Yibin School of Electrical Engineering Southeast University Nanjing China State Key Laboratory of Operation and Control of Renewable Energy ＆ Storage Systems China Electric Power Research Institute Beijing China China Electric Power Research Institute Nanjing China Jiangsu Engineering Technology Research Center for Energy Storage Conversion and Application China Electric Power Research Institute Nanjing China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

DC grid has a prospect of application in collecting and transmitting large-scale renewable energy over long distance. However, the randomness and fluctuation of the renewable power may hamper the stable operation of DC grid. energy storage device is able to actively absorb or supplement active power, which can be used to smooth the power fluctuation. The paper investigates a DC grid topology with energy storage and proposes a coordinated control strategy. The proposed strategy enables coordinated control of the renewable energy output power, pumped storage power and the grid consuming power. During the steady state, the control strategy enables the system DC voltage stable and power flow of the grid under zero-error control. During the faulted time, the coordinate control strategy enables the converter fast response and maintains the system DC voltage within safety margin. The effectiveness of the coordinated control strategy is verified by simulation in PSCAD/ EMTDC. © 2019 Institution of Engineering and *** right reserved.

关键词： energy storage

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Sub-synchronous oscillation(SSO) analysis of direct-driven permanent magnet synchronous generators(D-PMSG)considering influence of phase-locked loop(PLL)

Sub-synchronous oscillation(SSO) analysis of direct-driven p...

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8th renewable Power Generation Conference (RPG 2019)

作者： Zhang Xiaoyu Li Yan Tang Haiyan State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute No. 15 Xiaoying Rd(E). Qinghe Beijing 100192 China

ISBN: (数字)9781839531248

ISBN: (纸本)9781839531255

Since the phase-locked loop (PLL) synchronizes the frequency and phase of the wind turbine and the power grid, realizing the coupling between them, so its dynamic performance directly affects the transient characteristics of the wind turbine. In this paper, the mechanism of sub-synchronous oscillation ( SSO ) caused by direct-driven permanent magnet synchronous generators(D-PMSG) transmission system is studied, and the electromagnetic transient model of D-PMSG converter with PLL control is established by the harmonic linearization method. The influence of the dynamic characteristics of PLL on SSO caused by D-PMSG and the interaction between D-PMSG and connected power grid are studied. Finally, the critical conditions of SSO induced by D-PMSG are given by using the Nyquist criterion. Finally, D-PMSG delivery model based on Hami local power grid is built by PSCAD software. The detailed model of the D-PMSG transient system was established by using the PSCAD. The theoretical analysis of the proposed SSO are validated by the simulation results.

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General model and parameter tuning of doubly-fed wind turbines under asymmetric fault of power grid

General model and parameter tuning of doubly-fed wind turbin...

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8th renewable Power Generation Conference (RPG 2019)

作者： Haiyan Tang Xiwang Xu Yiding Jin Jianzu Hu Yan Li State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems (China Electric Power Research Institute) Beijing China National Power Dispatching and Controlling Center Beijing China

ISBN: (数字)9781839531248

ISBN: (纸本)9781839531255

In order to meet the needs of wind power grid-connected stability calculation, it is indispensable to establish an accurate electromechanical transient simulation model of wind turbines. At present, the mainstream simulation software considers positive sequence control in the electromechanical transient modeling of wind turbines, and it can well simulate the positive sequence components of active and reactive power of wind turbines under symmetrical fault. Nevertheless, under asymmetric faults, in order to achieve asymmetric fault ride throngh capability, wind turbines usually give priority to negative sequence control. If the negative sequence control is not considered in the model, the simulation of the transient response characteristics of wind turbines under asymmetric faults will be inaccurate. For doubly fed wind turbines, a general simulation model of wind turbines under positive sequence control is established, and the adaptability of the model under asymmetric fault of power grid is analyzed in the paper. Secondly, on the basis of positive sequence control model, an additional model considering the influence of negative sequence control is established. Finally, according to the actual FRT test data, the model parameters are adjusted to verify the effectiveness of the model and parameters under asymmetric faults.

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Space Charge Characteristics of Oil-paper under AC/DC Composite Voltage

Space Charge Characteristics of Oil-paper under AC/DC Compos...

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Conference on Electrical Insulation and Dielectric Phenomena, (CEIDP)

作者： Yuanxiang Zhou Xin Huang Ling Zhang Yunxiao Zhang Zhongliu Zhou Chenyuan Teng Lei Xue Meng Huang The Wind Solar Storage Division of State Key Laboratory of Power System and Generation Equipment School of Electrical Engineering Xinjiang University Urumqi China China State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Tsinghua University Haidian Beijing China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power Universiy Beijing China

ISBN: (纸本)9781728195728;9781728195735

Oil-paper insulation bears AC/DC composite voltage in converter transformers. However, the AC/DC space charge behavior is still not clear, which will result in electric field distortion, material aging and even insulation failure. In this work, the space charge distribution of oil-paper under the AC/DC composite voltage with the AC/DC ratio of 1:1, 1:3, 1:5, and 1:7, is studied by pulse electroacoustic (PEA) method, respectively. It was found that as DC component increases, the accumulated charge near the electrode decreases, while the interior charge increases. It suggests that DC stress mainly influences the amount and the depth of space charge accumulation. AC component has a relatively significant impact on the injection and extraction behavior of space charge near the electrode. Furthermore, AC/DC composite voltage enhances the migration of space charge compared with that under DC voltage. This research contributes to the further understanding of the space charge characteristics of oil-paper under AC/DC composite voltage, which will benefit the safe and stable operation of converter transformers.

关键词： Electrodes Conferences Space charge Oil insulation Aging Distortion Dielectrics

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Research on Characteristics and Structure Mode of Electricity Market

Research on Characteristics and Structure Mode of Electricit...

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IEEE Advanced Information Management,Communicates,Electronic and Automation control Conference (IMCEC)

作者： Hu Yuhai Liu Yanli Li Yan Qu Qi Guo Xuejian Guo Xin Zhao Chunzhang State Grid International Development Company Beijing China State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems Beijing China North China Electric Power University Beijing China

With the orderly advancement of the new round of power reform and the two-way guidance of the energy revolution and the energy Internet, China's power industry and market form will enter a new stage of development. If power grid enterprises want to rank first in the world and build a "world-class power grid" faster, they need to pay more attention to the transformation and integration of the operation mode based on the new power reform on the basis of the traditional "stable growth, meet the supply and demand", and pay attention to the quality of power service. The stage jumps and upgrades, focusing on the objective and effective evaluation of grid operation. This paper studies the characteristics of the power market industry and its structural mode. On the basis of analyzing the composition of the power market, it refines the characteristics of the power market industry and finally studies the power mode.

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Application of Transfer Entropy Algorithm in Fault Detection for Power System with Wind Turbines

Application of Transfer Entropy Algorithm in Fault Detection...

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International Conference on Advanced Power System Automation and Protection (APAP)

作者： Chen Ziyu Li Qing Feng Shouhong Li Weilin State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems Beijing P. R. China Northwestern Polytechnical University Xi’an P. R. China

ISBN: (数字)9781728117225

ISBN: (纸本)9781728117232

As the controllability of power electronic devices associated with wind turbines leads to a variety of fault characteristics, fault detection for power system with wind turbine has become a serious challenge. The theory of information entropy can quantify the degree of system uncertainty which has achieved good application results in the field of feature extraction and fault detection for power system. This paper proposed a solution to detect faults through transfer entropy algorithm. Firstly, the fundamentals of the algorithm is introduced. Then the algorithm is implemented on the field testing data of wind turbine fault ride through, and the details of parameter optimization is described. Finally, the adaptability of transfer entropy is studied considering different wind turbine capacities, controller models and different grid faults. This study provides theoretical and practical basis for the application of transfer entropy algorithm in the field of feature extraction and fault detection for power system.

关键词： Entropy Wind turbines Random variables Power systems Fault detection Couplings Time series analysis

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Research on Reactive Power and Voltage Support Capability of Distribution PV power station

Research on Reactive Power and Voltage Support Capability of...

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IEEE Electronic Power Grid (eGrid)

作者： Meiyin Liu Lianghui Xu Cong Cong Beibei Wu Renewable Energy Research Center State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute Nanjing China National Energy Solar Center China Electric Power Research Institute Nanjing China

ISBN: (数字)9781728157047

ISBN: (纸本)9781728157054

At present, the reactive power supporting ability of distributed photovoltaic (PV) power stations wins much attentions, and its corresponding evaluation has important theoretical and practical significance. However, there are many factors, including the access modes, the number of access points, the access voltage level and the power factor, can affect the reactive power supporting ability, which makes it difficult to comprehensive evaluate the reactive power supporting ability of distributed PV power station. In view of this, a comprehensive evaluation method is proposed in this study, it builds a comprehensive evaluation index system fully considering variety of influencing factor. By using the data collected from the typical PV power station verifies the proposed comprehensive evaluation index system and reactive power supporting ability evaluation method.

关键词： Reactive power Indexes Standards Power generation Voltage control Fluctuations Correlation

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A Probe into the Accuracy of Thermal Runaway Simulation Model of Lithium-ion Battery under Adiabatic Condition

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IOP Conference Series: Earth and Environmental Science 2021年第1期680卷

作者： Yilin Lai Kai Yang Hao Liu Fei Gao Mingjie Zhang Wen Xu State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute. Beijing 100192 China Zhe Jiang Huayun Electric Power Engineering Design & Consultation CO. LTD Hangzhou 310000 China

For the safety problem of lithium-ion battery, thermal abuse early warning is needed to be established, for which the main point is to analyze the mechanism and to establish the thermal abuse model of single lithium-ion battery. This article used 10Ah ternary lithium-ion battery as the research object and used simulation software to build thermal abuse simulation model. The accuracy of simulation model was verified by comparing the temperature simulation result with temperature data from adiabatic environment thermal abuse experiment. According to the results, heating trend of temperature of the simulation under adiabatic condition is approximately the same as that of ARC adiabatic test temperature. Before the end stage of self-heating period, the error remains within 5%; at the end of self-heating stage, the error is around 5-10%; after entering thermal runaway stage, the error can reach 36%. Missing the equation of reactions between electrode and additive, and internal short-circuit is the main reason causing the error of the simulation result.

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Review on Pumped storage Power Station in High Proportion renewable energy Power System

Review on Pumped Storage Power Station in High Proportion Re...

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IEEE Student Conference on Electric Machines and systems

作者： Bingxin Sun Shuping Tian Jiang He Liande Liu Zhiqiang Wang Jiawei Guo Fei Xu Te Cheng Junhui Li Inner Mongolia Hohhot Pumped-Storage Power Generation Co LTD Hohhot China State Key Lab of Power Systems Tsinghua University Beijing China Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education (Northeast Electric Powe University) Jilin China

ISBN: (数字)9781728156224

ISBN: (纸本)9781728156231

Large scale renewable energy, represented by wind power and photovoltaic power, has brought many problems for the safe and stable operation of power system. Firstly, this paper analyzes the main problems brought by large-scale wind power and photovoltaic power integration into the power system. Secondly, the paper introduces the basic principle and engineering construction of pumped storage power station. Thirdly, the paper expounds in detail the current application of pumped storage power station in power system, and finally points out the main problems faced by the development of Pumped storage Power Station and the development trend, so as to provide reference for the construction and operation of pumped storage power station.

关键词： Photovoltaic systems renewable energy sources Conferences Pumps Wind power generation Market research Power systems

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