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	1. ANALYSIS OF FRACTIONAL ORDER CAPACITOR IN SERIES AND PARALLEL CONNECTIONS
	WANG Faqiang,MA Xikui
	Dynamic and Electronic Engineering 01 November 2013
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	Abstract:Based on fractional calculus and the fractional order nature of the capacitor, the models for the fractional order capacitor in series and parallel connections are established and analyzed. The influence of the varied fractional order on the characteristic of the fractional order capacitor in series and parallel connections are given. Finally, the realization form of the fractional order capacitor is designed and the correctness of theoretical analysis is confirmed by using the circuit simulations from power electronics simulator (PSIM).
	TO cite this article:WANG Faqiang,MA Xikui. ANALYSIS OF FRACTIONAL ORDER CAPACITOR IN SERIES AND PARALLEL CONNECTIONS[OL].[ 1 November 2013] http://en.paper.edu.cn/en_releasepaper/content/4567556


	2. Adaptive Supervisory Robust Control of Wide-Area Power System with Time-Varying Delay
	HU Zhijian,ZHANG Ziyong
	Dynamic and Electronic Engineering 25 September 2013
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	Abstract:The paper uses an LMI-based iterative nonlinear optimization algorithm to establish a method of designing state-feedback controllers for power systems with a time-varying delay. This method is based on the delay-dependent stabilization conditions obtained by free weighting matrix approach. In the stabilization conditions, the upper bound of wide-area signal's transmission delays is taken into consideration. Combining theories of state observer, the adeptive supervisory controller (ASC) is designed and time-delay output feedback robust controller is realized for power system. The ASC uses the input information from wide-area measurement systems (WAMS) and dispatches supplementary control signals to the available local controllers. Simulation study in the New England test power system confirm that the proposed ASCs can dampen power oscillation effectively and is robust to time-varying delay condition.
	TO cite this article:HU Zhijian,ZHANG Ziyong. Adaptive Supervisory Robust Control of Wide-Area Power System with Time-Varying Delay[OL].[25 September 2013] http://en.paper.edu.cn/en_releasepaper/content/4560123

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	3. A Comprehensive Integrated Approach for Transmission and Distribution System Long Term Planning
	Ding Xiaoying
	Dynamic and Electronic Engineering 20 June 2013
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	Abstract:In this paper, a comprehensive integrated long term planning approach for the transmission and distribution systems is proposed. The presented method involves iterative loops between the transmission and distribution system models to ensure the validity of results with respect to both systems. The presented planning approach can be seen as a simplified dynamic planning in a step by step manner, and in each single-time period transmission system expansion planning and distribution system expansion planning are reviewed and coordinated iteratively. A real system of a certain utility at Texas USA is investigated, and the simulation results show that the proposed method is feasible and effective.
	TO cite this article:Ding Xiaoying. A Comprehensive Integrated Approach for Transmission and Distribution System Long Term Planning[OL].[20 June 2013] http://en.paper.edu.cn/en_releasepaper/content/4548783


	4. Research on the Three-phase Photovoltaic Grid-connected Control Strategy
	LIU Yukai,HU Zhijian,ZHANG Ziyong,SUO Jianglei,LIANG Kaibin
	Dynamic and Electronic Engineering 04 May 2013
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	Abstract:This paper mainly studies scheduling type photovoltaic generation system, and establishes a three-phase photovoltaic grid-connected model in Matlab/Simulink, which uses the MPPT control that can make full use of the solar energy. At the same time, energy storage device is added. The inverter of the energy storage device adopts V/f control. In the running state of the islanding because of a certain power failure, it can maintain a constant voltage and frequency. The simulation shows that as the output of the photovoltaic power increases, harmonic rate decreases under the same conditions, and the energy storage device can increase the stability of photovoltaic grid and reduce harmonic contents. So it's very necessary to add energy storage device in the photovoltaic system.
	TO cite this article:LIU Yukai,HU Zhijian,ZHANG Ziyong, et al. Research on the Three-phase Photovoltaic Grid-connected Control Strategy[OL].[ 4 May 2013] http://en.paper.edu.cn/en_releasepaper/content/4541473


	5. The Influence of Lagged Axial Magnetic Field on the Distribution of Cathodes Spots in Current-zero Stage of Vacuum Arc
	Jia Shenli,Song Xiaochuan,Shi Zongqian,Wang lijun,Zhang Yingkui
	Dynamic and Electronic Engineering 19 March 2013
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	Abstract:The influence of lagged axial magnetic field (AMF) due to eddy current induced in contacts system on the distribution of cathode spots (CSs) in current-zero stage of vacuum arc with different current falling rates was investigated experimentally. Experiments were conducted with cup-shaped AMF contacts in a demountable vacuum chamber. The characteristic of CSs distribution of triggered vacuum arc in current-zero stage with arc current frequency of 50Hz was investigated at first with the aid of a high-speed digital camera with an exposure time of 2 microseconds. Then the characteristic of CSs distribution with faster current falling rate, which was realized by injecting a countercurrent with frequency of 500Hz or 1kHz, was investigated. Moreover, the lagged AMF flux density in current-zero stage with different current falling rates was calculated by ANSYS. Research results showed that CSs located in the center of contact plate tended to extinguish earlier than those at periphery of contact plate in fast current-zero stage due to the stronger lagged AMF in contact center.
	TO cite this article:Jia Shenli,Song Xiaochuan,Shi Zongqian, et al. The Influence of Lagged Axial Magnetic Field on the Distribution of Cathodes Spots in Current-zero Stage of Vacuum Arc[OL].[19 March 2013] http://en.paper.edu.cn/en_releasepaper/content/4528043


	6. Numerical simulation on the motion of cathode spots in high-current vacuum arc
	Jia Shenli,Song Xiaochuan,Shi Zongqian,Wang Lijun
	Dynamic and Electronic Engineering 11 March 2013
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	Abstract:In this paper, the motion of high-current vacuum arc cathode spots is simulated numerically. The transverse magnetic field is computed by commercial software ANSYS with the current distribution in contact plate taken into account. The initial expansion process of cathode spots in triggered vacuum arc under self-generated azimuthal magnetic field without external AMF is simulated at first as a reference. Then three kinds of external AMF distributions are applied, i.e. uniform AMF, bell-shaped AMF and saddle-shaped AMF distribution. Simulation results show that cathode spots expand faster without external applied AMF than that under AMF. Further more, the distribution of AMF has significant influence on the motion pattern and the distribution of cathode spots on cathode surface, e.g., the concentration of cathode spots in the centre region under bell-shaped AMF is more serious than that under saddle-shaped AMF. The results also show that a ring-shaped distribution of cathode spots is not a stable configuration.
	TO cite this article:Jia Shenli,Song Xiaochuan,Shi Zongqian, et al. Numerical simulation on the motion of cathode spots in high-current vacuum arc[OL].[11 March 2013] http://en.paper.edu.cn/en_releasepaper/content/4528056


	7. Methods to measure MEA status in PEM fuel cell and the effects of test conditions
	PEI Pucheng,XU Huachi,ZENG Xia
	Dynamic and Electronic Engineering 28 February 2013
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	Abstract:To measure and monitor the membrane electrode assembly (MEA) status, the cyclic voltammetry (CV) and galvanostatic method are improved and compared. The electrochemical active surface area (EAS), double layer capacitance, H2 crossover current are measured by both the CV and galvanostatic method, and the cell resistance is also gained by the galvanostatic method. In the galvanostatic method, two or more constant currents are applied to a fuel cell stack, and the voltage responds between two electrodes of every cell are recorded and analyzed. Tests on a two-cell stack supplied with hydrogen in the anode and nitrogen in the cathode are carried out, and the influences of the temperature and relative humidity (RH) on the MEA parameters are investigated. Results show that with an increase in RH, both the double layer capacitance and EAS linear increase, while the hydrogen crossover current and cell resistance linear decrease; and with an increase in temperature, the hydrogen crossover current linear increases, cell resistance decreases, EAS and double layer capacitance show little change. The galvanostatic method shows a convenient technique to research the cell uniformity and the MEA lifetime in fuel cell stack.
	TO cite this article:PEI Pucheng,XU Huachi,ZENG Xia. Methods to measure MEA status in PEM fuel cell and the effects of test conditions[OL].[28 February 2013] http://en.paper.edu.cn/en_releasepaper/content/4524609


	8. An investigation on anti-flooding of PEMFC with in-plate adverse-flow flow-field
	LI Pengcheng,PEI Pucheng,HE Yongling,ZHANG Hongfei
	Dynamic and Electronic Engineering 27 February 2013
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	Abstract:The stoichiometric ratios and related regimes, which can promote anti-flooding of polymer electrolyte membrane fuel cell (PEMFC) with in-plate adverse-flow flow-field (IPAF), were investigated in this paper. Two flow combinations, which are the simple and complex adverse-flow between plates (ABP) that can be realized by IPAF, were employed to investigate. Constant stoichiometric ratios examination indicates that the complex ABP could improve anti-flooding of PEMFC better in the medium (greater than 200mA/cm2 and less than 1000mA/cm2) and high (greater than 1000mA/cm2) current densities than the simple ABP. More stoichiometric ratios were introduced to find the cathode critical stoichiometry. Under the condition of cathode critical stoichiometry, the maximal local relative humidity of both electrodes of complex ABP is equal to 100% and below while the anti-flooding of the cathode of simple ABP is not satisfactory in the medium and high current densities. Further study shows that the mechanism of fuel cell, which is the interdependence between the electrodes effect, can make significant contribution to anti-flooding.
	TO cite this article:LI Pengcheng,PEI Pucheng,HE Yongling, et al. An investigation on anti-flooding of PEMFC with in-plate adverse-flow flow-field[OL].[27 February 2013] http://en.paper.edu.cn/en_releasepaper/content/4524116


	9. Novel Bistable PM Electromagnetic Clutch Unit for Wheel EV Drive
	CaiWanli,GuChenglin
	Dynamic and Electronic Engineering 06 February 2013
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	Abstract:A rigid connection between hub and motor in wheel electric vehicle (EV) drive makes the mechanical and electromagnetic impulsion inevitable especially in starting and braking. Referring to the mechanical clutch solution used in conventional cars, this paper tries to adopt an electromagnetic clutch between hub and motor, aiming to weaken the impulsion flexibly by an electrically-controlled connection. Accordingly, a novel bistable permanent magnet (PM) electromagnetic clutch unit is proposed. General design principle for this unit is investigated in detail and the magnetic field analysis is carried on getting the leakage coefficient. Analysis results show that the novel clutch would be a well-competitive challenger.
	TO cite this article:CaiWanli,GuChenglin. Novel Bistable PM Electromagnetic Clutch Unit for Wheel EV Drive[OL].[ 6 February 2013] http://en.paper.edu.cn/en_releasepaper/content/4519500


	10. A Modified Balanced Truncation Method and its Application to Model Reduction of Power System
	HUANG Chongxin,DAI Xianzhong,ZHANG Kaifeng
	Dynamic and Electronic Engineering 08 January 2013
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	Abstract:The balanced truncation method (BTM) can make the reduced model preserve the controllability, observability, stability, and dynamic response of the original model, but some steady-state deviations between the reduced model and the original model exist. On the premise of keeping the merits of the BTM, this paper modifies the BTM to narrow the deviations by introducing a gain factor into the transfer function matrix of the reduced model to adjust the steady-state value of the output of the reduced model, but not to change the dynamic behavior. For verifying the modified BTM, we apply the method to the model reduction of a typical two-machine power system. The testing results indicate that the modified method can decrease the deviations, lower the order of the system, and retain dynamic behaviors of the original model.
	TO cite this article:HUANG Chongxin,DAI Xianzhong,ZHANG Kaifeng. A Modified Balanced Truncation Method and its Application to Model Reduction of Power System[OL].[ 8 January 2013] http://en.paper.edu.cn/en_releasepaper/content/4513304

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