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Workshop on Predictive control of Electrical Drives and Power Electronics (PRECEDE)

作者： Yanyan Li Guohao Li Zhenjun Wu Shiyang Hu Nan Jin Leilei Guo Kui Luo College of Electrical and Information Engineering Zhengzhou University of Light Industry Zhengzhou China College of Electrical and Information Engineering Hunan University Changsha China State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute Beijing China

So as to reduce the current harmonics and power ripple after bidirectional AC/DC converter bridge arm fault, a multi-vector model predictive fault-tolerant control method is proposed. First, the system of bidirectional AC/DC converter with a bridge arm fault is reconstructed. Then the operation mechanism of fault-tolerant converter structure and the relationship of voltage vectors are clarified. Second, the power prediction model under the converter fault-tolerant operation mode is established. Multiple voltage vectors are used in a switching cycle. The new synthetic vector is used to track the optimal vector. The switching order of each vector is fixed to realize switching frequency concentrate. Third, the simulation model is built. The results show that the bidirectional AC/DC converter can operate fault-tolerant operation after the bridge arm failure under the control strategy proposed and the output current harmonics and power ripples are reduced. The system has good steady-state and dynamic performance.

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External Electrode Temperature Monitoring of Lithium Iron Phosphate Batteries Based on Fiber Bragg Grating Sensors

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IOP Conference Series: Earth and Environmental Science 2020年第1期495卷

作者： Jun Peng Yiming Jin Shuhai Jia Shouping Xu School of Mechanical Engineering Xi'an Jiaotong University Xi'an 710049 China State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems (China Electric Power Research Institute Beijing 100192 China)

Lithium-ion (Li-ion) batteries have become a promising candidate for the electrical energy storage and power delivery solutions. Thermal management is a key tool to improve performance and safety of Lithium-ion batteries. Currently, the common method is using electric sensors to monitor the thermal behaviour of batteries. In this work, an optical fiber sensor was proposed for temperature measurement of cells. The proposed sensor consists of a metal ring and a fiber Bragg grating (FBG). The FBG sensor calibration test shows a good linearity and high sensitivity. The FBG sensors were gloved on the external electrodes to monitor the temperature variation during charge/discharge cycles, and the PT100 sensors were attached on the electrodes as a comparison. Comparison test illustrates the response of proposed FBG sensors has a good agreement with PT100 sensors. It provides that the proposed FBG sensor can be used to monitor the temperature variation of cells, which provides a promising tool to improve the thermal management and safety of Li-ion batteries.

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Analysis and control of Improved MMC With Symmetrical Super Capacitor energy storage System in EER Application

Analysis and Control of Improved MMC With Symmetrical Super ...

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IEEE Electronic Power Grid (eGrid)

作者： Haibo Tao Xiaofeng Yang Z. Li Trillion Q Zheng X. You Pavel Kobrle State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute Beijing China School of Electrical Engineering Beijing Jiaotong University Beijing China Faculty of Electrical Engineering Czech Technical University in Prague Prague Czech Republic

ISBN: (数字)9781728157047

ISBN: (纸本)9781728157054

energy storage system becomes one of key components in the medium voltage grid with the ever-increasing development of renewable energy resources. This paper proposes an improved modular multilevel converter (IMMC) where symmetrical super capacitor energy storage banks are interfaced to the three-terminal power unit through a Buck/Boost converter. Six typical operation modes are taken into account and the control algorithms such as state of charge (SOC) equalization and sub-module capacitor balance based on carrier phase shift sine pulse width modulation (CPS-SPWM) are developed. Finally., the analysis and control strategies are verified through the MATLAB/Simulink simulation results and down-scaled prototype experimental results.

关键词： Capacitors energy storage Voltage control Pulse width modulation Mathematical model Power control renewable energy sources

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A Virtual Boundary Element Method for Three-Dimensional Inverse Heat Conduction Problems in Orthotropic Media

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Computer Modeling in Engineering & Sciences 2018年第11期117卷 189-211页

作者： Xu Liu Guojian Shao Xingxing Yue Qingbin Yang Jingbo Su College of Mechanics and Materials Hohai UniversityNanjing211100China School of Material Science and Engineering Nanjing University of Science&TechnologyNanjing210094China State Key Laboratory of Operation and Control of Renewable Energy&Storage Systems China Electric Power Research InstituteBeijing100192China College of Harbour Coastal and Offshore EngineeringHohai UniversityNanjing210098China.

This paper aims to apply a virtual boundary element method(VBEM)to solve the inverse problems of three-dimensional heat conduction in orthotropic *** method avoids the singular integrations in the conventional boundary element method,and can be treated as a potential approach for solving the inverse problems of the heat conduction owing to the boundary-only discretization and semi-analytical *** the VBEM is applied to the inverse problems,the numerical instability may occur if a virtual boundary is not properly *** method encounters a highly illconditioned matrix for the larger distance between the physical boundary and the virtual boundary,and otherwise is hard to avoid the singularity of the source ***,it must adopt an appropriate regularization method to deal with the ill-posed systems of inverse *** this study,the VBEM and different regularization techniques are combined to model the inverse problem of three-dimensional heat conduction in orthotropic *** proper regularization techniques not only make the virtual boundary to be allocated freer,but also solve the ill-conditioned equation of the inverse *** examples demonstrate that the proposed method is efficient,accurate and numerically stable for solving the inverse problems of three-dimensional heat conduction in orthotropic media.

关键词： Virtual boundary element method Tikhonov regularization threedimensional heat conduction inverse problem orthotropic media.

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Study on the Rate Performance of Porous Na2Ti3O7 for Sodium-ion Battery Anode Material

Study on the Rate Performance of Porous Na2Ti3O7 for Sodium-...

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2018 International Conference on Computer, Communications and Mechatronics Engineering（CCME 2018）

作者： Fei GAO Kai YANG Mao-song FAN Hao LIU Kang-kang WANG State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute

In this paper, carbon spheres with active groups on the surface were prepared by hydrothermal method. And porous NaTiO material was prepared by sol-gel method with the carbon spheres as template. The results of scanning electron microscopy（SEM） showed the porous structure and the pore size ranged from hundreds of nanometers to 2 micron. XRD test results showed that pure phase materials were synthesized and the grain size was 47.6 nm. The results of electrochemical performance test showed the good rate performance of this material. The charge capacity of the material were 64.4 mAhg and 50.4 mAhg at 5 C and 10 C after 150 cycles, and the capacity retention rates were 62.5% and 66.3%, respectively.

关键词： Template method Porous structure Rate performance Capacity retention rate

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Virtual inertia control strategy of doubly-fed induction generator with additional inertia and damping torque 3

Virtual inertia control strategy of doubly-fed induction gen...

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3rd International Conference on New energy and Future energy System, NEFES 2018

作者： Ren, Q.Y. Qian, M.H. Zhu, C.L. Zhao, D.W. Liu, H.M. Zhu, L.Z. Li, G.J. College of Energy and Electrical Engineering Hohai University Nanjing211100 China State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems China Electric Power Research Institute Beijing China Jiangsu Engineering Technology Research Center for Energy Storage Conversion and Application China Electric Power Research Institute Nanjing China

Doubly-fed induction generator (DFIG) with dual Pulse-Width Modulation (PWM) converter cannot maintain the active power balance or voltage stability of the power grid self-synchronously because of lacking mechanical inertia and mechanical damping. The virtual synchronous generator (VSG) technology can help solve this problem through simulating the mechanical equation and electromagnetic equation of synchronous generator to control the grid-connected converter. However, under the common first-order virtual inertia link used in the VSG control scheme, while DFIG providing active power support, there exists second frequency dip and the rotor speed recovers slowly, which is not conducive for DFIG to provide continuous and effective virtual inertia support. In order to overcome the drawbacks as well as avoid second frequency dip, this paper puts forward a virtual inertia control strategy of DFIG with additional inertia and damping torque. The additional torque is achieved by proportional-derivative (PD) controller with rotor slip as an input signal. Simulation results on DIgSILENT/powerfactory platform show that the proposed control strategy is effective to reduce frequency deviation and recover the rotor speed faster without second frequency dip phenomenon. © Published under licence by IOP Publishing Ltd.

关键词： Synchronous generators

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Wind turbine failure detection based on SCADA data and data mining method

Wind turbine failure detection based on SCADA data and data ...

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8th renewable Power Generation Conference (RPG 2019)

作者： SiYu Tao Zheng Qian Yan Pei AnQi Wang FangHong Zhang School of Instrumentation and Optoelectronic Engineering Beihang University Beijing China State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute Haidian Dist. Beijing China CSIC HaiZhuang Windpower Co. Ltd Chongqing China

ISBN: (数字)9781839531248

ISBN: (纸本)9781839531255

WTFD (Wind Turbine Failure Detection) system is important for improving wind turbine reliability and reducing operation & maintenance cost. A WTFD method using only SCADA data and data mining algorithm is proposed. Firstly, select representative variables from a wide variety of SCADA variables using ARD (Automatic Relevance Determination) method. Then, the denoising autoencoders (DAE) model using the selected variables with sliding window is developed to capture nonlinear correlations among multiple variables and autocorrelation of each variable. Finally, using the Mahalanobs distance (MD) of reconstruction error to make the WTFD. Real world dataset is used to validate the efficiency of the proposed method. The results show that the proposed method can provide advanced failure alarm for wind turbines many hours before failure happens. The results of our proposed WTFD method can reduce operation & maintenance cost and improve wind turbine reliability.

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Study on deep-peak regulation of coal-gas-hydro power system in Portugal when considering high wind penetration

Study on deep-peak regulation of coal-gas-hydro power system...

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8th renewable Power Generation Conference (RPG 2019)

作者： Zhao Liang Yu Ruoying Chen Peijin Han Bin State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute Beijing 100192 China School of Electrical Engineering Southeast University Nanjing 210096 Jiangsu Province China China Electric Power Research Institute Beijing 100192 China

ISBN: (数字)9781839531248

ISBN: (纸本)9781839531255

In the field of renewable energy generation, Portugal is in the leading position in the world. The electricity production of wind farms accounting for one third of the total electricity demand in Portugal. At the same time, the high penetration of wind power in the country's power system brings more uncertainty to net demand, which can bring grave challenges to peak load regulation. Considering the high penetration rate of wind power in Portugal power gird, a model on configuration of peak load regulation resources and a strategy of peak load regulation are established. The model aims to minimize the prime cost of peak load regulation. It is based on the mathematical model of each kind of resource. It also reckons the difference of hydro plants' peak shaving ability in different seasons. Finally, it proves its rationality and practicability through applications on specific examples of Portugal power system. The results show that the study on this model has great importance to peak load regulation in a power system with high penetration rate of new energy resources.

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Demand response measures and its quantitative effects in promoting renewable energy accommodation in high proportional renewable energy scenario

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The Journal of Engineering 2018年第13期2017卷 1367-1372页

作者： Xiaofei Li Yuehui Huang Shuo Yang State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems China Electric Power Research Institute Beijing 100192 People's Republic of China

The rapid growth of renewable energy generation capacity, including wind power and photovoltaic power, brings greater challenges to its accommodation. Based on the renewable energy power output characteristics, this study analyses the calculation method and optimisation model of renewable energy power accommodation ability, and explores two demand response (DR) measures, including transferable load and electric power alternative, and conducts quantitative analysis on their effects in renewable energy power accommodation. Based on the design scenario of the Northwest Power Grid in 2020, the demand-side response measures were adopted to enhance the accommodation of renewable energy. The results show that the effectiveness of the model and the two DR measures can improve the ability of renewable energy accommodation. DR is an important direction in the accommodation of renewable energy based on the current load level.

关键词： renewable energy sources demand side management demand-side response measures Northwest Power Grid electric power alternative transferable load DR measures renewable energy power accommodation ability calculation method renewable energy power output characteristics high proportional renewable energy scenario

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A Grid Impedance Identification Method Based on Complex Coefficient Filter Considering DC Offset Effects

A Grid Impedance Identification Method Based on Complex Coef...

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International Conference on Electrical Machines and systems (ICEMS)

作者： Leilei Guo Congcong Zhu Nan Jin Linwang Dai Yanyan Li Yishu Sun School of Electrical and Information Engineering Zhengzhou University of Light Industry Zhengzhou China School of Building Environment Engineering Zhengzhou University of Light Industry Zhengzhou China State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute Beijing China

ISBN: (纸本)9781728133997

For the purpose of acquiring the accurate grid impedance, a complex coefficient filter (CCF) based grid impedance identification method is studied in this paper. High frequency non-characteristic harmonic voltages and currents are injected into the power grid by the power converter firstly. Next, a CCF is used to extract these high frequency voltages and currents from the sampled voltages and currents at the point of common coupling. Then, the grid impedance is calculated based on the extracted voltages and currents. Considering that the impacts of the DC offset on the grid impedance identification cannot be removed by the conventional CCF, an improved CCF is proposed in this paper by adding a high-pass filter to the forward channel of the conventional CCF. The filter characteristic of the proposed CCF is analyzed, which shows its DC offset suppression capability. Simulation results show the effectiveness of the proposed grid impedance detection method.

关键词： Impedance Power harmonic filters Harmonic analysis Industries Power grids

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