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2019 International Conference on Sensing, Diagnostics, Prognostics, and control, SDPC 2019

作者： He, Chengbing Wang, Runze Ma, Li Li, Xiaobo Jiao, Xiaofeng Song, Lei North China Electric Power University School of Energy Power and Mechanical Engineering Beijing China Inner Mongolia Electric Power Science Research Institute Inner Mongolia Hohhot China Chinese Academy of Sciences Technology and Engineering Center for Space Utilization Line Beijing China

ISBN: (纸本)9781728101996

The construction of Bayesian network (BN) model is a bottleneck problem that needs to be solved urgently in the field of fault diagnosis. Combining failure mode and effect analysis(FMEA) and fault tree analysis(FTA) can solve this problem well. In this paper, a BN model based on FMEA/FTA is proposed. The transformation methods of FMEA to BN and FTA to BN are analyzed. The structural matrix is used to realize the information transformation. The noisy-max model is used to determine the BN parameters. Taking the rub-impact fault between the high pressure rotor and the front shaft seal of a 600 MW turbogenerator unit as an example, the application of the BN model based on FMEA/FTA in fault diagnosis is realized from three aspects which are BN model construction, prior probability and conditional probability assignment, and diagnosis reasoning, respectively. © 2019 IEEE.

关键词： Bayesian networks

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A multi-level reactive power control strategy for PV power plant based on sensitivity analysis

A multi-level reactive power control strategy for PV power p...

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2018 China International Conference on Electricity Distribution, CICED 2018

作者： Minhui, Qian Qin, Hao Dawei, Zhao Chen, Ning Dajun, Jiang Ningbo, Wang Chen, Zhao Nanjing Jiangsu Province210003 China Changping District Beijing102206 China Jiangsu Engineering Technology Research Center for Energy Storage Conversion and Application China Electric Power Research Institute Nanjing Jiangsu Province210003 China Wind Power Technology Center of Gansu Electric Power Company Lanzhou Jiangsu Province730050 China

ISBN: (纸本)9781538667750

In order to make full use of the ability of photovoltaic (PV) units to regulate their own reactive power to participate in voltage stability control of power system, this paper takes full account of the interaction between power grid and PV power plant and proposes a multi-level reactive power control strategy based on sensitivity analysis for PV plant. Firstly, reference of reactive power is calculated combined with the analysis of reactive power and voltage sensitivity of PV power plant and the operation status of power grid. Secondly, reactive power command is allocated to each PV unit according to the reactive power margin. Finally, a reactive power control system model based on an actual PV plant project is established to verify the correctness of proposed strategy in this paper. © 2018 IEEE

关键词： Sensitivity analysis

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Quasi-Parallel Resonant Switched Capacitor DC-DC Converter with Continuous Voltage Regulation Capability

Quasi-Parallel Resonant Switched Capacitor DC-DC Converter w...

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2024 IEEE Energy conversion Congress and Exposition, ECCE 2024

作者： Qi, Jingjing Wu, Xuezhi Xu, Wenzheng Sun, Kai Tsinghua University State Key Laboratory of Power System Operation and Control Department of Electrical Engineering Beijing China Beijing Jiaotong University National Active Distribution Network Technology Research Center Beijing China

ISBN: (纸本)9798350376067

Resonant switched capacitor converters have the advantages of small size, light weight and high efficiency, but have poor voltage regulation ability. To overcome this problem, a quasi-parallel resonant switched capacitor DC-DC converter is proposed in this paper, which mainly incorporates a resonant switched capacitor converter with soft-switching and variable voltage ratio and a Buck converter. Most of the power can be transmitted by the resonant switched capacitor converter, while the Buck converter is responsible for output voltage regulation. In addition, the voltage ratio of the resonant switched capacitor converter can be flexibly changed base on the input voltage, which is beneficial for Buck converter to always handle a small portion of power. Furthermore, input voltage feedforward control is incorporated to suppress the input voltage disturbance. The proposed converter can not only continuously regulate the voltage over a wide range, but also perform high efficiency and achieve rapid dynamic response. The operating principle of the converter is introduced, the circuit characteristic is analyzed, and the correctness of the theoretical analysis is verified by experiments. © 2024 IEEE.

关键词： Capacitor bank

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Study on the Matching of Solid State power controller in Cascade Application

Study on the Matching of Solid State Power Controller in Cas...

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Smart power & Internet Energy Systems (SPIES), International Conference on

作者： Huiyao Li Yonggang Chen Zitian Chen Peng Gui Jie Wang Shenyang Wu Beijing Space Power Conversion and Control Engineering Research Center Beijing Spacecrafts Co. Ltd Beijing China North China Institute of Aerospace Engineering Hebei China

In view of the mismatch of the protection characteristics between the SSPC(solid-state power controller)and the cascade application of the fuse in the process of power distribution and use of the spacecraft, this paper analyzes the working principle and protection characteristics of the solid-state power controller. In this paper, the working principle and protection characteristics of the solid state power controller are studied theoretically. The use principle of the space fuse and the breaking characteristics of the parallel application are analyzed. A new method is presented, which combines the inverse time curve key parameter programming of the solid state power controller with the adjustment of the circuit threshold immediately, to solve the flexible matching problem of the protection characteristics when the fuse is cascaded. Finally, the theoretical calculation basis and the principle of safety and reliability evaluation are given, and the feasibility of this method is further verified by experimental verification. It is of great reference significance for the combination of the space distribution management solid state power controller and the fuse.

关键词： space vehicles Satellites Fuses power distribution Process control Aerospace electronics Reliability theory

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research on Current Differential Sampling Accuracy Based on Solid State Electronic Switch

Research on Current Differential Sampling Accuracy Based on ...

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Smart power & Internet Energy Systems (SPIES), International Conference on

作者： Huiyao Li Li Wang Xiaobin Deng Jie Wang Liang Ren Junbiao Shi Beijing Space Power Conversion and Control Engineering Research Center Beijing Spacecrafts Co. Ltd Beijing China Beijing Spacecrafts Co. Ltd Beijing China

Based on the application of the new generation of space-borne solid-state power distribution products, this paper studies the measurement accuracy of current differential sampling technology used by them, and deduces the influence factors of accuracy by analyzing the circuit model of the differential sampling circuit. The effective control measures of accuracy are summarized by analyzing the mechanism of influence factors, which provides theoretical basis for the application of current differential sampling technology and the design of high precision index circuit, and has important reference significance.

关键词： Analytical models Solid modeling power measurement Current measurement Energy power distribution Switches

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control and experiment of modular multilevel converter with tuned filters for wide frequency range operation

Control and experiment of modular multilevel converter with ...

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Annual Conference of Industrial Electronics Society

作者： Jun Min Qianming Xu An Luo Fujun Ma Zhixing He Yufei Yue Leming Zhou Yu Liang National Electric Power Conversion and Control Engineering Technology Research Center Hunan University Changsha China State Grid Beijing Electric Power Company Beijing China

As the fluctuation of sub-module capacitance voltage when MMC operates at low frequency, the application of MMC in the field of motor drive has been limited. Therefore, this paper proposes a low frequency control method for the MMC with tuned filter circuit. Based on the theoretical analysis for this tuned filter, the circulating current of 2 nd frequency could be suppressed effectively at rated frequency. The tuned filter also enables the minimum voltage that is adopted to control high frequency circulating current at low frequency by feasible parameters. In addition, design of circulating current controller is simplified, because the high frequency circulating current with mixed and variable frequency is no longer needed in this strategy. Zero-error tracking to the hybrid reference current is achieved by proportional integral resonant (PIR) control. Finally, the accuracy of analysis and effectiveness of proposed strategy are proved by a prototype experiment.

关键词： Resonant frequency Capacitors Bridge circuits RLC circuits Voltage control Fluctuations

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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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Bionic microchannels for step lifting transpiration

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International Journal of Extreme Manufacturing 2023年第2期5卷 244-252页

作者： Zhaolong Wang Qiu Yin Ziheng Zhan Wenhao Li Mingzhu Xie Huigao Duan Ping Cheng Ce Zhang Yongping Chen Zhichao Dong Interdisciplinary Research Center of Low-carbon Technology and Equipment College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082People’s Republic of China MOE Key Laboratory for Power Machinery and Engineering School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240People’s Republic of China Qian Xuesen Laboratory of Space Technology China Academy of Space Technology(CAST)Beijing 100094People’s Republic of China Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application School of Environmental Science and EngineeringSuzhou University of Science and TechnologySuzhouJiangsu 215009People’s Republic of China Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096People’s Republic of China Chinese Academy of Sciences Key Laboratory of Bio-inspired Materials and Interface Sciences Technical Institute of Physics and ChemistryChinese Academy of Sciences100190 BeijingPeople’s Republic of China

Those various cross-sectional vessels in trees transfer water to as high as 100 meters,but the traditional fabrication methods limit the manufacturing of those vessels,resulting in the non-availability of those bionic ***,we fabricate those bionic microchannels with various cross-sections by employing projection micro-stereolithography(PμSL)based 3D printing *** circumradius of bionic microchannels(pentagonal,square,triangle,and five-pointed star)can be as small as 100μm with precisely fabricated sharp ***'s more,those bionic microchannels demonstrate marvelous microfluidic performance with strong precursor effects enabled by their sharp *** significantly,those special properties of our bionic microchannels enable them outstanding step lifting performance to transport water to tens of millimeters,though the water can only be transported to at most 20 mm for a single bionic *** mimicked transpiration based on the step lifting of water from bionic microchannels is also *** precisely fabricated,low-cost,various cross-sectional bionic microchannels promise applications as microfluidic chips,long-distance unpowered water transportation,step lifting,mimicked transpiration,and so on.

关键词： bionic microchannel microfluidics water transportation step lifting 3D printing

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A fast robust PWM method for photovoltaic grid-connected inverter

A fast robust PWM method for photovoltaic grid-connected inv...

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Annual Conference of Industrial Electronics Society

作者： Ling Yang An Luo Yandong Chen Kunshan Huai Leming Zhou Xiaoping Zhou Wenhua Wu Wenjuan Tan Zhiwei Xie National Electric Power Conversion and Control Engineering Technology Research Center Hunan University Changsha China

In photovoltaic grid-connected inverter based on the deadbeat current control, the filter inductance variation and one-step-delay control affect the distortion of the grid current, stability and dynamic of the system. In this paper, a fast robust PWM method for photovoltaic grid-connected inverter is proposed, which reduces the distortion of the grid current caused by the filter inductance variation, effectively solves the delay of the one-step-delay control, and improves the stability and dynamic response speed of the system. Considering the parasitic resistance of the filter inductance and the line equivalent resistance, the influence of the filter inductance deviation coefficient on the system performance is analyzed, and the appropriate control parameter range is given. Simulation and experimental results verify the effectiveness of the proposed method.

关键词： Inductance Pulse width modulation Inverters Robustness Photovoltaic systems Delays

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A Hybrid Multilevel Converter Topology Based on NPC and CHB Series and Its control Method

A Hybrid Multilevel Converter Topology Based on NPC and CHB ...

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Smart power & Internet Energy Systems (SPIES), International Conference on

作者： Peng Ren Chunming Tu Yuchao Hou Qi Guo Zejun Huang Wenhui Jia National Electric Power Conversion and Control Engineering Technology Research Center Hunan University Changsha China

Aiming at the problems of the existing multilevel converters, such as the large number of devices, high loss, and low power density, a novel hybrid multilevel converter (HMC) topology is proposed in this paper. The HMC consists of a three-level neutral-point clamped (NPC) cell configured with Si GTO and a cascaded H-bridge (CHB) cell configured with a mixture of Si IGBT and SiC MOSFET. For this topology, a specific hybrid high-low frequency modulation is proposed to give full play to the advantages of low switching loss of SiC devices and low on-state loss of Si-based devices. In addition, in order to solve the problem of unbalanced capacitor voltage of the hybrid topology sub-modules, an alternate voltage balancing control (AVBC) strategy is proposed. Finally, the feasibility of the HMC topology and modulation is verified by simulation.

关键词： Insulated gate bipolar transistors Multilevel converters power system measurements Frequency modulation Silicon carbide Density measurement Capacitors

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