Liu W.,Henan Electric Power Company |
Zhao Y.,Henan Electric Power Research Institute |
Shi G.,Henan Electric Power Research Institute
Dianli Zidonghua Shebei/Electric Power Automation Equipment | Year: 2013
A concept of one-key test for intelligent substation relay protections is proposed based on their characteristics and test requirements. The one-key test system may import the CID file of the protection to be tested or the SCD file of overall substation configuration to obtain the parameters, channel configuration and indicators of the protection to be tested, obtain the setting values via MMS network and enable/disable the soft platen by sending and receiving GOOSE information to realize the protection configuration. With the one-key test system, the test of protection is carried out automatically and the test report is automatically generated, realizing the automatic and intelligent test of substation protections.
State Grid Corporation of China and Henan Electric Power Research Institute | Date: 2016-06-01
The present invention relates to the field of anti-galloping devices, and specifically to a spacer. The spacer includes: a spacer body, an adjusting plate, and a span wire; an upper end and a lower end of the spacer body are respectively connected to a connecting fitting and the adjusting plate, the spacer body between the connecting fitting and the adjusting plate is sleeved with two end-portion accessories and an insulation umbrella skirt located between the two end-portion accessories, and two ends of the span wire are separately connected to the adjusting plate and the ground. According to the present invention, a spacer is installed between a line wire and the ground, so that phase-to-phase and phase-to-ground distances can be effectively controlled, phase-to-phase and phase-to-ground short circuits are avoided, security of high-voltage transmission lines is ensured, and an additional insulation distance is not increased.
Henan Electric Power Research Institute, Beijing Soaring Electrical Technology Co. and State Grid Corporation of China | Date: 2013-08-28
The present invention provides a method for realizing on/off-grid dual-mode operation of a bidirectional converter in a micro power grid, wherein an on/off-grid controller in the micro power grid detects if the large power grid loses power or the power supply is resumed, instructions of prepare to go off-grid, go off-grid, prepare to go on-grid, or go on-grid are sent to the bidirectional converter in an interface form of two-bit binary code, meanwhile the on/off-grid controller communicates with the micro power grid control system, and the micro power grid control system sends instruction signal of charge/discharge power to make the bidirectional converter perform a corresponding operation. When the large power grid loses power, the bidirectional converter will immediately transfer from the on-grid operation state to the off-grid operation state and switch to the operating mode of voltage source. Without additional investment on facility, this method solves the problem that the energy storage system and photovoltaic on-grid inverter can not work after the large power grid loses power, and the problem that its difficult to set up a micro power grid system, and meanwhile it realizes a fast and seamless conversion between off-grid operation and on-grid operation in the micro power grid control.
Zhang X.N.,Henan Electric Power Research Institute |
Li X.M.,CPI Henan Power Maintenance Engineering Co.
Applied Mechanics and Materials | Year: 2012
This paper describes a novel laboratory technique for characterizing the scale inhibitors performance of reverse osmosis. The experiment was carried out by operating the RO system in a once-through flow mode which was operated by continuous withdrawal of concentrate and permeate. The concentration ratio of reverse osmosis system is calculated by mass or flow or volume of permeate and concentrate. The performance of scale inhibitors was evaluated according to the scale ion concentration of concentrate. The results showed that the method can screen out the performance of anti-scalants quickly and with low error. © (2012) Trans Tech Publications, Switzerland.
Zhao G.,CAS Beijing National Laboratory for Molecular |
Zhao G.,Henan Electric Power Research Institute |
He Y.,CAS Beijing National Laboratory for Molecular |
He C.,CAS Beijing National Laboratory for Molecular |
And 3 more authors.
Solar Energy Materials and Solar Cells | Year: 2011
We report the photovoltaic properties of a DA copolymer, poly(benzothiadiazole-thiophene-co-bithiophene) (PBTTbT), containing the donor (D) unit of oligothiophene with a hexyl side chain and the acceptor (A) unit of 2,1,3-benzothiadiazole (BT) with a methyl side chain. The geometry, electronic and absorption spectroscopic properties of bithiophene-benzothiadiazole- thiophene monomer (M1) of the polymer were investigated theoretically by the density functional theory (DFT) method for deep understanding the relationship of the structure and properties of the polymer. Polymer solar cells (PSCs) were fabricated with PBTTbT as an electron donor blended with [6,6]-phenyl-C71- butyric acid methyl ester (PC70BM) as an electron acceptor. The power conversion efficiency (PCE) of PSC is 0.87% for an optimized PBTTbT:PC 70BM weight ratio of 1:3, under the illumination of AM 1.5, 100 mW/cm2. With the additive of 1% 1,8-dioctanedithiol and thermal annealing at 130 °C for 15 min, the PCE of the device was improved to 1.98%. The efficiency improvement of the device was ascribed to a better morphology of the PBTTbT:PC70BM active layer with the additive and thermal annealing. © 2010 Elsevier B.V. All rights reserved.
Wang J.,Henan Electric Power Research Institute
Advanced Materials Research | Year: 2012
According to the principle of PSS2B model of IEEE, reason for producing reverse regulation for PSS is analyzed. Through analysis of the frequency characteristic, it is put forward that setting power matching coefficient and filter parameters can reduce the influence of antiregulating. The model of simulation is established, which is based on the Matlab. Result of simulation shows that the method is valid. It can make the method of setting PSS parameters more perfect. © (2012) Trans Tech Publications.
Ma W.,Henan Electric Power Research Institute
Lecture Notes in Electrical Engineering | Year: 2014
The problem that each cell's voltage is not equal in super capacitors series will affect the whole performance of series connected super capacitor strings. In order to solve this problem, an equalizing circuit is designed in this paper. This equalizing circuit uses inductances as energy storage elements, transfers energy from super capacitor with high voltage to the lower ones to achieve voltage balance. To prove the feasibility of this method, simulations and experiments have been done. The results show that this method can make each super capacitor's voltage tend to be equaled even when the discrepancy of the super capacitors' capacity is big. This method solves the voltage inequality in super capacitors series effectively and eliminates a difficult problem in engineering application. © Springer International Publishing Switzerland 2014.
Liu Y.,Henan Electric Power Research Institute |
Liu W.-Q.,Henan University of Science and Technology
Wuli Xuebao/Acta Physica Sinica | Year: 2011
We propose a method of obtaining peakon solution from bell-shape smooth soliton (or solitary wave) solution, i. e. constructing directly an ansatz solution of peakon according to the well-known bell-shape smooth soliton solution and then determining the coefficients in ansatz solution. The method is verified to be feasible for four nonlinear wave equations and one set of equations. The bell-shape smooth soliton (or solitary wave) solution and peakon solution can exist in the same expression and the expressions of peakon solutions include those of the bell-shape smooth soliton solutions and the latter are the special cases of the former. © Chinese Physical Society.
Zhang J.,Henan Electric Power Research Institute |
Chen Z.,Henan Electric Power Research Institute
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2010
As an important component of the smart grid, the advanced metering infrastructure (AMI) will trigger profound changes in the future power system. In this paper, the definition, functions and some issues closely related to AMI, such as the electricity pricing mechanism, renewable sources of energy generation and consumer energy storage devices, are studied. The influence of AMI on future power system is discussed and the AMI and customer power information gathering system are compared. Finally, suggestions are made for research on and construction of AMI in China. ©2010 State Grid Electric Power Research Institute Press.
Qian S.,Henan Electric Power Research Institute |
Wang F.,Henan Electric Power Research Institute
Advanced Materials Research | Year: 2012
In order to reduce the road asphalt fumes in the process of construction, the paper proposed to add some substances in asphalt to reduce the yield of asphalt fumes. Firstly, considering the theory of how the asphalt fumes come into being in the process of construction on the pavement, six possible additives to restrain these fumes havd been screened out. And tests of fumes suppression effect had been done to get the results that: SBS has a good effect of fumes suppression. When added by 3%, the asphalt fumes reduced by the rate of 19.2%; PE has an suppressive effect on asphalt fumes. When added by 3%, the asphalt fumes reduced by the rate of 6.5%; Melamine has a good effect of fumes suppression. When added by 3%, the asphalt fumes reduced by the rate of 45.1%; Ammonium molybdophosphate has an abnormal effect of fumes suppression. When added by 1%, the asphalt fumes not only did not reduce but increases. When added by 3%, the asphalt fumes reduced by the rate of 23.3%; Nano Calcium carbonate has an effect of fumes suppression. When added by 3%, the asphalt fumes reduced by the rate of 4.8%; Activated Carbon has a good effect of fumes suppression. When added by 3%, the asphalt fumes reduced by the rate of 41.6%.