Hunan Electric Power Test and Research Institute

Changsha, China

Hunan Electric Power Test and Research Institute

Changsha, China
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Xu X.-Y.,Hunan Electric Power Test and Research Institute
2016 IEEE International Conference on Power and Renewable Energy, ICPRE 2016 | Year: 2017

A novel type hybrid active power filter with injection circuit (IHAPF) is proposed. The passive filter of this system can be used for reactive power compensation as well as for harmonic mitigation. The active power filter does not bear fundamental voltage any more. A new sliding-window iterative algorithm based on discrete fourier transform (SWIDFT) is proposed for detecting harmonic current. Recursive integral PI regulator (RIPI) is adopted in current closed-loop controller and this control method can eliminate steady-state error. Fuzzy algorithm is used to adjust the coefficients of RIPI online. Results of industrial application show that the proposed control and detection methods in this paper can meet the requirement of IHAPF controller. After IHAPF with the proposed controller is run, the total harmonic distortion (THD) of supply current is reduced to 1.8% from 41.8 % and the power factor of the system is increased to 0.95 from 0.55.


Zhang Y.,Hunan Electric Power Test and Research Institute | Lu J.-Z.,Hunan Electric Power Test and Research Institute | Li B.,Hunan Electric Power Test and Research Institute
Gaodianya Jishu/High Voltage Engineering | Year: 2011

AC charge spots are the major energy supply facilities for power cell of electric vehicle which uses on-board charger. To overcome the disadvantages that harmonics of on-board charger directly interferes with power grids, the active power filter was applied to the AC charge spots, by which can construct the perfect and new AC charge spots. Two different characters were applied to AC charge spots of the experimental prototype, therefore, a complex control method that traditional PI control is combined with the repetitive control can effectively restrain the influences of harmonics of AC charge spots on the power grids and energy metering and billing system, and maintain the stability of the charging communication system.


Xu Z.,Hunan Electric Power Test and Research Institute | Zhai M.,North China Electrical Power University | Lu J.,North China Electrical Power University
IEEE Transactions on Power Delivery | Year: 2011

This paper considers the cross-layer optimization for orthogonal frequency-division multiple access-based power-line communication systems. The user scheduling in the data-link control layer selects the serving users and ascertains their optimal cross-layer parameters according to each user's quality-of-service (QoS) requirements, QoS satisfaction degree, packet traffic model, channel and queue status information, and rate of transmitted data. The resource allocation in the physical layer assigns subcarrier and power for the scheduling users according to their QoS requirements, correlative cross-layer parameters, and channel status information. Since the multiuser's subcarrier-power allocation is a layered multiobjective mixed-integer nonlinear problem with many practical restrictions, it is first transformed into the multiple simple single-objective problems by using the resource factor. After obtaining each Pareto solution of the used resources based on the resource factor for satisfying the minimal rate of each user, the remaining resources are assigned to the users with a maximal rate without considering the resource factor by using the bit-loading lookup table algorithm. Finally, the optimal solution is selected from the results of resource allocation according to the order of the partial information. Based on the typical power-line channel scenarios, the simulation results illustrate that the proposed algorithm outperforms the existing multiuser algorithms in terms of the multiple aims of resource allocation. © 2011 IEEE.


Liao G.,Hunan Electric Power Test and Research Institute | Xie X.,Hunan Electric Power Test and Research Institute | Liu D.,Hunan Electric Power Test and Research Institute | Hou Y.,Hunan Electric Power Test and Research Institute
Dianwang Jishu/Power System Technology | Year: 2011

Whether the 20 kV distribution networks should be developed in Hunan power grid as well as what kind of voltage grade series should be adopted in Hunan power grid are important problems that the power network planning of Hunan power grid has to be faced with. According to actual condition of Hunan power grid, a method to evaluate voltage grade series scheme is given, and on this basis taking Baodong technopark, east urban power supply area in Shaoyang and rural area in Ziyang for example, the techno-economy of developing 20 kV distribution networks in the areas where power networks are newly built, built up areas in city and rural low load-density areas are respectively analyzed. The obtained results are available for reference in the development of 20 kV distribution networks in other power grids.


Tong L.,Huazhong University of Science and Technology | Zou X.,Huazhong University of Science and Technology | Zhang Y.,Hunan Electric Power Test and Research Institute | Kang Y.,Huazhong University of Science and Technology
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2011

With a general analysis on instantaneous power balance relationship for a single-phase unified power quality conditioner (UPQC), this paper proposed a dual current sources coordinated control strategy based on the adaptive filter current detection for UPQC. Considering that the current detection accuracy has great influences on the compensation performances of the proposed control strategy, a fixed frequency filter algorithm for improving the detection accuracy was then proposed on premise of preserving the rapidity of traditional variable-step adaptive algorithm. In view of the controller design for the UPQC in dual current sources mode, a compound controller incorporating P controller and Repetitive controller was adopted to implement the current tracking control for the series and parallel active power filters, and a small signal model of DC link voltage closed-loop control system on the whole UPQC was presented to provide theoretical indications for designing DC voltage loop controller parameters. The research results show that the UPQC based on the above-mentioned control strategy and controller design methods realizes favorable load voltage and source current compensation performances. © 2011 Chinese Society for Electrical Engineering.


Long H.-G.,Hunan Electric Power Test and Research Institute
Dongli Gongcheng Xuebao/Journal of Chinese Society of Power Engineering | Year: 2010

Taking austenitic stainless steel tubes TP304H and TP347H as an example, detection tests were carried out to oxidation scales on inner surface of the tube bends using residual magnetic and lifting power method. Results show that after excitation of external magnetic field, both the density and lifting power of the scales' residual magnetism will rise with growing accumulation of scales, and once the accumulation gets to a certain amount, the variation tendency will slow down. The density and lifting power are also affected by tube size, i. e. the thicker the tube wall, or the larger the inner diameter of tube, the less they will be. For different shapes of tube bends, oxidation scales inside V type bends have the strongest magnetism and. lifting power, followed by U type, then L type. The residual magnetic and lifting power method can be taken to quickly detect the accumulation amount of oxidation scales on inner surface of austenitic stainless steel tube bends.


Fang Q.,Huazhong University of Science and Technology | Wang H.,Huazhong University of Science and Technology | Wei Y.,Huazhong University of Science and Technology | Lei L.,Hunan Electric Power Test and Research Institute | And 2 more authors.
Fuel Processing Technology | Year: 2010

Numerical studies of the slagging characteristics under different operational conditions in a 300 MW down-fired boiler were carried out using slagging models coupled with gas-solid two phase flow and combustion models. Combined with the real operating conditions; comparative and detailed analysis on the slagging position, extent, and causes is presented. The results show that the serious slagging is mainly on the side walls of the lower furnace. Because of the more rapid expansion of the flue gas under the higher temperature, the flue gas in the furnace center makes the flue gas on both sides deflect and flow to the side walls; and the pulverized-coal flame impinges on the side walls. This results in the slagging on the side walls. Under off-design operating conditions, such as stopping some burners, the local flow field is asymmetric and impinges on the local arch burner, front and rear wall regions where the stopped burners are located. It leads to slight slagging on the arch burner regions and the front and rear wall regions of the lower furnace. Based on the investigation, it has been found that the serious slagging on the side walls can be effectively alleviated by cutting off the burners close to the side walls, reducing boiler load and burning low slagging-tendency coals. © 2009 Elsevier B.V. All rights reserved.


Fang Q.,Huazhong University of Science and Technology | Wang H.,Huazhong University of Science and Technology | Zhou H.,Huazhong University of Science and Technology | Lei L.,Hunan Electric Power Test and Research Institute | Duan X.,Hunan Electric Power Test and Research Institute
Energy and Fuels | Year: 2010

This paper presents a systematic study on improving the performance of a 300 MW down-fired pulverized-coal utility boiler by inclining downward the F-layer secondary air (SA). A numerical method was adopted to evaluate the effects of inclined angles on the characteristics of flow, combustion, and nitrogen oxide (NO x) emissions in the furnace. Retrofitting was conducted to incline the F-layer SA downward with an optimal inclined angle of 25°. Full-scale experimental measurements were carried out before and after retrofitting. The results indicate that inclining downward the F-layer SA can increase the flame penetration depth and lower downward the flame center. The residence time of pulverized-coal particles increases, and the SA staging level enhances in the furnace. The boiler performance is improved with absolute increases of 3.55, 3.31, and 2.20% in boiler efficiencies and relative reductions of 28.65, 19.07, and 12.53% in NO x emissions under 300, 240, and 190 MW loads, respectively. © 2010 American Chemical Society.


Lu J.,Hunan Electric Power Test and Research Institute | Zhang H.,Hunan Electric Power Test and Research Institute | Peng J.,Hunan Electric Power Test and Research Institute | Fang Z.,Hunan Electric Power Test and Research Institute | Li B.,Hunan Electric Power Test and Research Institute
Gaodianya Jishu/High Voltage Engineering | Year: 2012

It is very important to analyze icing recurrence interval of power grid for understanding ice disaster law and guiding ice-resistant. We put forward a calculation method of icing recurrence interval of power grid based on extreme-value type I, and calculated the icing days for recurrence period of 15 years, 30 years, 50 years and 100 years from 97 weather stations with the observation data of icing days from 1951 to 2008. The results show that the number of icing day for recurrence period of 100 years in Changsha Mapoling weather station is 14.78. If standard of serious icing of over 11 days is adopted, recurrence period of serious icing is 24.8 years in this model. Consequently, an icing distribution map of recurrence period of multi-years is plotted for design of anti-icing of power grid, showing that areas of serious icing are southwest and southeast of Hunan.


Ruan Q.-Y.,North China Electrical Power University | Gu X.-P.,North China Electrical Power University | Lu J.-Z.,Hunan Electric Power Test and Research Institute | Zhang H.-X.,Hunan Electric Power Test and Research Institute
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2011

The paper analyzes three line ice-melting problems, including the line sequence of melting ice, power point selection, and short-circuit point selection. According to the solving methods and the simulated parameters, the simulation models to calculate the ice-melting current are built on Matlab, and harmonic suppression reactance is added selectively to control harmonic distortion. VFP is used to develop a management system of anti-freezing and ice-melting, which can store and inquire line electrical parameters and calculate ice-melting time. Based on the calculating results, the relations between the ice-melting time and the ice thickness, ice-melting current, the wind speed, and the temperature are analyzed. The moving DC ice-melting device is used on 220 kV Tian-Shang line in Loudi. By building simulation models, the ice-melting current is obtained and the harmonics' influence is analyzed, then the ice-melting time is computed by the management system. It's shown that the calculation results basically accord with the results on the spot.

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