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Sun J.,Harbin Institute of Technology | Lu R.,Harbin Institute of Technology | Wei G.,Harbin Institute of Technology | Xu B.,Heilongjiang Electrical Power Research Institute | Zhu C.,Harbin Institute of Technology
2012 IEEE Vehicle Power and Propulsion Conference, VPPC 2012 | Year: 2012

In the series-connected lithium-ion battery string application for electric vehicles, equalizer is needed to enhance battery cycle life and maintain the stable performance. The equalizer is taken as an important part of battery management system(BMS), which detects the voltage of each cell to determine the control strategy for equalizer. How to improve the efficiency and reduce loss is always the problem to be solved. This paper proposes a high efficiency nondissipative equalizer for series-connected battery string, which uses forward converter to transfer energy from the highest voltage battery to the lowest voltage one. Current feedback is taken to maintain the stability of output current by adjusting the duty of Pulse Width Modulation (PWM) signal. The proposed equalizer has characteristics such as low loss, high efficiency and short equalization time. The operation principle of the proposed equalizer and design analysis is presented in this paper. Experimental results verify that the proposed equalization method has good cell balancing performance. © 2012 IEEE.


Guo Y.,Harbin Institute of Technology | Lu R.,Harbin Institute of Technology | Wu G.,Heilongjiang Electrical Power Research Institute | Zhu C.,Harbin Institute of Technology
2012 IEEE Vehicle Power and Propulsion Conference, VPPC 2012 | Year: 2012

Equalization for battery pack to enhance its usage life and performance is important for xEVs. In this paper, an isolated bidirectional equalizer based on full-bridge for Lithium-ion battery string is proposed. If a battery charge is excessive, the equalizer transfer charge from this cell to battery string; if a battery charge is insufficient, the equalizer will charge this cell from battery string. Closed-loop control keeps the equalization current constant, allowing precise control of the transferred charge. On the basis of considering OCV hysteresis, we proposed an equalization strategy based on SOC estimation for the equalizer. The equalizer features small size, high efficiency, and high accuracy. Experimental results confirm the applicability of the equalization scheme. © 2012 IEEE.


Feng F.,Harbin Institute of Technology | Lu R.,Harbin Institute of Technology | Wu G.,Heilongjiang Electrical Power Research Institute | Zhu C.,Harbin Institute of Technology
2012 IEEE Vehicle Power and Propulsion Conference, VPPC 2012 | Year: 2012

The Li-Ion battery packs are consist of multiple cells in series and parallel to meet the energy and voltage requirement for high power applications, such as electric vehicle and hybrid electric vehicle. But because of the different consistency between the battery cells, the performance will decline in different levels after a certain charge-discharge cycles. A measuring method of available capacity is proposed in this paper, in order to keep the batteries in series consistent. The available capacity of battery in series is determined by the first cell reaching the upper limit voltage in charging and the first cell reaching the bottom limit voltage in discharging. A total of 4 packs fresh cells are used for implementation of the proposed process. © 2012 IEEE.


Yu C.,Heilongjiang Electrical Power Research Institute | Lu R.,Harbin Institute of Technology | Su C.,Harbin Institute of Technology | Zhu C.,Harbin Institute of Technology
IEEE Transactions on Plasma Science | Year: 2013

In this paper, a compact wireless energy and data transmission device, which can be used on the remote projectile, is described. This device uses a magnetic field generated by the coupled coil to receive the energy and data and transfer the internal data. These functions above can be realized by operating the control circuit in different modes, which requires only one coil in the projectile. In energy transmission mode, energy can be transferred into the projectile wirelessly, as well as the external data by data encoding technology. A high-frequency magnetic field is generated by an internal device when the internal data are delivered to the external receiver coil. Interference between the energy and data transmission can be avoided by adjusting the data resonant frequency, which is different from the energy transfer frequency, by changing the resonant circuit topology and the internal capacitance. The device works at zero voltage switching mode and produces lower loss, which is beneficial for improving the efficiency. The experiment results show that the device can transfer energy at 1 MHz and internal data at 500 kHz. © 1973-2012 IEEE.


Li G.-X.,Heilongjiang Electrical Power Research Institute | Jiang Z.-Q.,Heilongjiang Electrical Power Research Institute | Wang X.-D.,Heilongjiang Electrical Power Research Institute
Gaoya Dianqi/High Voltage Apparatus | Year: 2011

Based on the detecting data of SF 6 decomposition products accumulated for years and the analyses of many fault cases of SF 6 electrical equipment, this paper expounds the theory and feasibility of fault diagnosis for SF 6 electrical equipment by detecting the content of SF 6 decomposition products, and analyzes some real cases and their diagnosing processes in order to provide a reference for inspection, detection and fault diagnosis of SF 6 electrical equipment.


Feng S.C.,China Guodian Beijing Lucency Enviro Technology Co. | Chen X.D.,Heilongjiang Electrical Power Research Institute
Advanced Materials Research | Year: 2014

Because earthquakes may cause severe damage to buried pipelines, it is important to study dynamic response of buried pipelines. For dynamic response problem of buried pipelines, variational method is the suitable method. In the paper, Gurtin-type quasi-variational principle of buried pipelines dynamics is established by convolutional variational integral method, which is theoretical foundation of finite element method for solving buried pipelines dynamics problems. © (2014) Trans Tech Publications, Switzerland.


Yuheng Y.,Harbin University of Science and Technology | Lei W.,Heilongjiang Electrical Power Research Institute
International Journal of Control and Automation | Year: 2016

With the development and application of lithium iron phosphate battery, more and more power battery in DC system using lithium iron phosphate batteries to replace original lead-acid battery. The lithium iron phosphate battery management system (BMS) is the focus of this paper, the communication between the battery management system and the substation monitor of DC system, effectively ensure the battery and the DC system is safe and reliable to work. How to grasp the variation rule of the internal state of the battery and the influence of external factors on the capacity of the battery, to establish a reasonable and effective battery model and algorithm of SOC and realize SOC estimation and reduce the estimation error, which is the most basic and the most important aspect of the battery safety management. © 2016 SERSC.


Guan W.,Heilongjiang Electrical Power Research Institute | Guan W.,Hunan University | Tan Y.,Hunan University | Zhang H.,Hunan University | Song J.,Hunan University
International Journal of Electrical Power and Energy Systems | Year: 2015

This work presents a methodology for distribution system feeder reconfiguration considering different model of DGs with an objective of minimizing real power loss. The distributed generation availability of wind turbines, solar photovoltaic panels and fuel cell etc., are classified into different models according to their operation modes and control characteristics. Decimal coded quantum particle swarm optimization (DQPSO) has been applied to solve feeder reconfiguration of DGs. The method applies decimal encoding to quantum particle swarm optimization (QPSO), which can decrease the particle length, generate few infeasible solutions and have better search efficiency. Aiming to the problem that the reactive power output of PV model sometimes exceeds the limit, this paper researches the impact factors of the output reactive power during reconfigurations, such as rated active power and rated voltage magnitude. The method has been tested on IEEE 33-bus and PG&E 69-bus radial distribution systems to demonstrate the performance and effectiveness of the proposed method. © 2014 Elsevier Ltd. All rights reserved.


Yin Y.,Harbin University of Science and Technology | Wang L.,Heilongjiang Electrical Power Research Institute | Liu H.,Harbin University of Science and Technology | Fan Q.,Harbin University of Science and Technology
International Journal of Control and Automation | Year: 2013

Protective measures can be rapidly and reliably taken by timely and correctly selecting the fault phase coping with the line protection, as well as the right operation of single-phase tripping and single phase re-closing. Traditional selection method is insensitive and insufficient in dealing with fault resistance, fault position, mutual inductance between closed lines, reactive effect and the in-sufficient for system parameters using power frequency component. This paper has proposed series multi-resolution morphological gradient (SMMG) filter, to extract the deviation of power frequency component of mode current, constructing a new phase selecting component of fault phase component, which provides a solution to fault phase selecting component of fault phase component.


Gao Z.W.,Heilongjiang Electrical Power Research Institute | Zhu X.C.,Heilongjiang Electrical Power Research Institute | Yang S.J.,North China Electrical Power University | Nie H.Y.,Harbin University of Science and Technology
Advanced Materials Research | Year: 2014

With the increasing of the amount of composite insulators in power network, the transmission accidents caused by the fault of composite insulators are increased and the aging of composite insulators should be paying more attention. In the paper, fourier transform infrared spectroscopy (FTIR) is used to analysis the molecular structure of silicone rubber material of composite insulators. The results indicated that the higher the electric field of the insulator shed, the lower the peak of FTIR spectra. The heavier pollution the sample run, the lower the peak of FTIR spectra. So more attention should be pay to the samples which run in heavier pollution region or the high field part of the insulator. © (2014) Trans Tech Publications, Switzerland.

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