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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

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. Source

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

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. Source

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

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. Source

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

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. Source

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

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. Source

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