Anhui Electrical Power Research Institute

Hefei, China

Anhui Electrical Power Research Institute

Hefei, China

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Feng G.,University of Science and Technology of China | Yao L.,Anhui Electrical Power Research Institute | Chen S.,University of Science and Technology of China
Integration, the VLSI Journal | Year: 2017

Discrete Fourier Transform (DFT) is widely used in almost all fields of science and engineering. Meanwhile, modern applications processing big data, such as images and sound, require increasingly complex features, such as the long and non-power-of-two hardware DFT and floating-point operations with wide ranges and high effective resolutions. In this paper, we propose a method to extend the matrix-factorization-based DFT algorithm for performing non-power-of-two DFTs of length N equal to the product of coprime numbers. Based on this algorithm, we also present a new DFT architecture synthesizer with high portability, called AutoNFT, to generate hardware DFT in a fully parallel structure. The architecture also contains a high-performance floating-point core to work at 1. GHz. DFTs generated by AutoNFT can run at 500 Mhz using a 40. nm industry library. This technology can handle 115 billion fixed-point samples per second on 256-point DFT and 13.5 billion floating-point samples per second on 30-point DFT. © 2017 Elsevier B.V.


Ding M.,Hefei University of Technology | Wu J.,Hefei University of Technology | Zhu C.,Hangzhou Electric Power | Zhao B.,Hangzhou Electric Power | And 2 more authors.
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2013

Taking advantage of battery energy storage system (BESS) to smooth wind power fluctuations can improve the stability of the power output of wind power plant. To cope with the problem caused by the strong randomness, especially for sudden changes of wind power, a storage system smoothing control strategy based on the weighted moving average filtering algorithm is proposed in this paper. This method can effectively smooth large power fluctuations by adjusting weights and filter bandwidth timely according to the volatility of wind power and current state of charge (SOC) of the storage system. In order to maintain the SOC at a reasonable level, after considering a variety of constraints, this paper adopts the fuzzy control method to design a control strategy which can regulate the SOC of the storage battery automatically according to the real-time status. Results indicate that the control strategy presented in this paper can effectively smooth power fluctuations under the premise of stabilizing the SOC at a reasonable level, meanwhile, the method is based on the on-line information, which endows it with future prospects of real-time application. © 2013 Chinese Society for Electrical Engineering.


Xie Y.,Anhui Electrical Power Research Institute | Chiang H.,Cornell University
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2011

As a novel effective approach to nonlinear optimization problems, the Trust-Tech method is applied to solving the optimal power flow (OPF) problem. The proposed method consists of two phases: Phase I locates the feasible solutions for OPF problem by searching the stable equilibrium point of the quotient gradient system corresponding to the constraints set, and the idea of active set is employed to deal with the inequality constraints so that the computational requirement can be reduced; Phase II reduces the feasible region by adding the extra inequality constraints with respect to the upper limit of the objective function into the original OPF problem. By alternating between the two phases, the proposed method can locate the optimal solution for OPF problem by gradually decreasing the upper limit of the objective. Numerical results of a number of test systems are given to demonstrate the effectiveness of the method. © 2011 State Grid Electric Power Research Institute Press.


Ding M.,Hefei University of Technology | Wang B.,Hefei University of Technology | Zhao B.,Zhejiang Electrical Power Test and Research Institute | Chen Z.,Anhui Electrical Power Research Institute
Dianwang Jishu/Power System Technology | Year: 2013

Standalone PV-wind-diesel-battery hybrid microgrid supplies power to local loads by power sources within the microgrid, and the primary target is to enhance the accouplement between the generated power and the load maximally. To improve the economy of whole microgrid while the power supply reliability is ensured, it is necessary to perform optimal design of capacity configuration of the microgrid according to existing conditions in whether and resources and to choose optimal source capacity combination. Mathematical models for different kinds of power sources within the standalone PV-wind-diesel-battery hybrid microgrid are established respectively, and two economic models of investment cost and different expenses are built too. Based on the dispatching strategy and constraints of this hybrid system, the numbers of different power sources are taken as variables and the minimum composite cost and expenses as optimization objective, and then the optimal capacity configurations of different power sources in the system are solved by genetic algorithm. The reasonableness of the proposed models is verified by case study results.


Ding M.,Hefei University of Technology | Lin G.,Hefei University of Technology | Chen Z.,Anhui Electrical Power Research Institute | Luo Y.,Anhui Electrical Power Research Institute | Zhao B.,Zhejiang Electrical Power Test and Research Institute
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2012

For reducing the fluctuation of renewable energy output power in maximum degree and optimizing the operation of hybrid energy storage system (HESS), this paper adopted the low-pass filtering algorithm whose time constant was mixed with the state of charge (SOC) of HESS to determine the goal output, and adopted the fuzzy control theory to distribute the power deviation out of the leveling target between two energy storage mediums, according to the SOCs of batteries and supercapacitors. For reducing the number of times of battery charging and discharging, the supercapacitors compensate the power deviation independently when their energy was adequate. Numerical results showed that the control strategy could effectively level the fluctuation of renewable energy power, avoid the out-of-limit phenomenon of energy storage mediums, and achieve the purpose for prolonging batteries' life. © 2012 Chinese Society for Electrical Engineering.


Patent
Anhui Electrical Power Research Institute, State Grid Corporation of China and SUZHOU HD Electrical CO. | Date: 2011-09-22

A power frequency parameter simulation system for a power transmission line and a control method thereof, the system comprises a simulation main circuit (1), an interference power supply (2) and a procedure controller (3). In the system, a power frequency parameter of a 10 to 100 kilometers of 500 kV power transmission line is simulated in a parameter integration manner; and the control method comprises the following steps of: a step to detect the automatically zeroing during starting up, a step to control the reduction of the length of a simulation line and a step to control a simulation interference voltage. A long-distance power transmission line is realized to be moved into a room and be tested by means of the power frequency parameter test system, so the various inconveniences of on-site measurement are avoided. The system realizes intelligent control over the simulation power line according to acquisition and analysis of the procedure controller to a signal, secure and reliable test and experiment performed on the power frequency parameter of the line in a laboratory can be realized, reliable training equipment is provided for learners, the anti-interference capability of a tester can be checked, and the whole system is applicable to line parameter testers produced by most of the conventional factories in China.


Wang X.,Hubei University | Zhang X.,Anhui Electrical Power Research Institute | Zhan L.,Hubei University | Ren Y.,Hubei University
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2012

The microstructure evolutions, including changes of substructure, precipitates, and the effect of microstructure degradation on the high temperature stress rupture limit and hardness of T91 steel were investigated using the specimens taken from the thermal aging materials and exploded superheater tubes. Results show that during long-term exposure the tempered martensite transforms to an equiaxed sub-grain structure with low dislocation density and coarsen M23C6 carbides through recover and recrystalization, and the Z-phase forms at final aging state. It is found that the microstructure and stress rupture limit of T91 steel are very stable after equivalent ageing at 600°C for 100000 h. M23C6 carbide coarsening and lath microstructure degradation to equiaxed sub-grain structure before the formation of Z-phase lead to the significantly breakdown of stress rupture limit, which is the main cause for the tube bursting. The lowing stress rupture limit and hardness of T91 is caused by microstructure degradation. © 2012 China. Soc. for Elec. Eng.


Chen G.,Anhui Electrical Power Research Institute | Wang X.,Hefei University of Technology | Wang J.,Anhui Electrical Power Research Institute | Liu J.,Anhui Electrical Power Research Institute | And 2 more authors.
Engineering Failure Analysis | Year: 2012

In order to evaluate the damage of the 26-year-old ACSR conductors of the 100. kV Zhu-Xie transmission line in Tongling, Anhui province, China, the conductors across the #11 and #12 towers were studied via morphological observation, metallurgical analysis and individual wire tensile strength (IWTS) test, especially for the conductors under the vibration dampers and the strain clamps. The results show that the outer Al strands of the conductor under the vibration damper and the strain clamp are mainly subject to the scraping damage by the aluminum armour tape and the adhesion/abrasive wear injured by the aluminum armour tape and the other Al strands. As for the inner Al strands, the main damage mechanisms are of the adhesion/abrasive wear and the propagation of the fatigue cracks originated from the wear surface. For the steel core strands, only the zinc coating is partially destroyed, but the steel cores are survived. After 26. years running, the average IWTSs of the outer/inner Al strands decrease more or less, however, the IWTS of the steel core strands is almost not changed. The aged conductors are still in a good condition, but more intensive inspection and maintenance is suggested. © 2011 Elsevier Ltd.


Ding M.,Hefei University of Technology | Wu X.,Hefei University of Technology | Lu W.,Anhui Electrical Power Research Institute | Zhang Z.,Anhui Electrical Power Research Institute
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2012

A method of three-phase probabilistic power flow for distribution systems with single-phase and three-phase grid-connected photovoltaic (PV) systems is introduced using sequential Monte Carlo techniques. The hourly output power of PV system is simulated considering solar irradiance, random change of weather, efficiency and effective sunlight area of PV arrays, efficiency of maximum power point tracking (MPPT) and inverter, and the reliability of overall PV system. The time-varying load model with randomness is incorporated in the probabilistic power flow and a program is developed. Case studies verify the feasibility and applicability of the method. ©2012 State Grid Electric Power Research Institute Press.


Chen X.,Anhui Electrical Power Research Institute | Zheng M.,Anhui Electrical Power Research Institute | Li J.,Anhui Electrical Power Research Institute
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2012

Aging characteristics of silicone rubber composite insulator shed materials obtained from long-term operation and laboratory aging experiments were studied by attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR). Laboratory aging experiments were performed under 600 h UV irradiation and 500 h salt-fog exposure respectively. Operation-aged samples were obtained from 110 kV and 500 kV lines in Anhui province. The results show that long-term operation-aged silicone rubber exhibit various main chain fragmentation, cross-linking degree decrease, methyl groups loss, etc.. 600 h exposure of silicone rubber samples to UV irradiation leads to the decrease of organic components in silicone rubber, while Al(OH)3 remains nearly untouched. 500 h exposure of silicone rubber samples to salt mist causes the decrease of Al(OH)3, while organic components in silicone rubber remains the same as before. The results will be helpful for research of composite insulators aging and optimization design of anti-aging, serving as references for the manufacture, design, and operation. © 2012 Chinese Society for Electrical Engineering.

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