Hunan Electrical Power Design Institute

Changsha, China

Hunan Electrical Power Design Institute

Changsha, China
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Liu S.-X.,Changsha University of Science and Technology | Liu S.-J.,Hunan Electrical Power Design Institute
Advanced Materials Research | Year: 2013

Based on analysis deformation characteristics of rigid pile and soil under the embankment load pile composite foundation. This paper does to work as follows. First of all, problems of previous pile-soil displacement model were analyzed, and an improved displacement mode has been proposed. Secondly, the stress of pile and soil was analyzed. Base on the analysis, some further work was done in the part II. An engineering example was analyzed and shows in part II. © (2013) Trans Tech Publications, Switzerland.


Liu S.-X.,Changsha University of Science and Technology | Liu S.J.,Hunan Electrical Power Design Institute
Advanced Materials Research | Year: 2013

Base on the analysis of problems of previous pile-soil displacement model, rigid pile settlement under embankment load method was established, this method can also consider the factors of soil and the relative slip between pile and earth deformation dyssynchrony. Some theories were described in part I. In this part, some theoretical calculations and an engineering example was analyzed and shows that the rationality and feasibility of the method. © (2013) Trans Tech Publications, Switzerland.


Deng F.,Changsha University of Science and Technology | Chen N.,Wuhan University | Zeng X.,Changsha University of Science and Technology | Li Z.,Changsha University of Science and Technology | And 2 more authors.
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2010

In order to improve the reliability and economy of the network-based traveling wave fault location system, an optimal configuration algorithm for network-based traveling wave fault location equipments based on graph theory is proposed. It can be analyzed that network structure and fault point position will affect the determination of the shortest initial traveling wave transmission path, and consequently affect the effective configuration of traveling wave fault location equipment. In the proposed algorithm, it is firstly assumed that each transmission line in a power grid is fault line, then the Floyd algorithm with the preserved fault line is used to simplify the complex network for further analysis. Subsequently, in the simplified (radiated) network, all the nodes at each side of the fault line are respectively formed two arrays according to the fault point position, the minimum sharing set is determined through the arrays at each fault situation, and then the optimal configuration scheme can thus be determined. At the same time, an additional optimal configuration scheme for the special fault condition is presented. The optimal configuration algorithm is established upon network-based traveling wave fault location principle, which can be used rather straightforward. Simulation results show that the optimal configuration algorithm is reliable and easy to realize. © 2010 State Grid Electric Power Research Institute Press.


Wang Y.,Guangxi University | Wang Y.,Changsha University of Science and Technology | Jian J.,Guangxi University | Zeng X.,Changsha University of Science and Technology | And 2 more authors.
International Journal of Electrical Power and Energy Systems | Year: 2012

A new type of high-voltage generator which offers a direct connection to the power network without the need for a step-up transformer is called powerformer. The neutral of the most powerformers is unearthed which belongs to NIEPS. When a stator single phase-to-ground fault occurs in a powerformer, every generator that is connected in parallel with the faulty powerformer has the same voltage. Traditional protection schemes using zero sequence voltage and third-harmonic voltage signals cannot detect which powerformer is faulted. In order to solve this problem for powerformer protection, a novel stator single phase-to-ground fault protection based on the direction and magnitude of zero-sequence currents is proposed in this paper. Simulation results have shown that, under different fault conditions, the new scheme can distinguish reliably internal faults from external faults, and can detect stator single phase-to-ground fault occurred in which powerformer with resistance 1 kΩ. A 100% of the winding can be fully protected. © 2011 Elsevier Ltd. All rights reserved.


Xia C.C.,Tongji University | Zhou S.W.,Tongji University | Du S.G.,Shaoxing University | Song Y.L.,Hunan Electrical Power Design Institute
Geomechanics from Micro to Macro - Proceedings of the TC105 ISSMGE International Symposium on Geomechanics from Micro to Macro, IS-Cambridge 2014 | Year: 2015

A numerical simulation was proposed for the direct shear behavior of rough joints with 2D particle flow code. The modeling of real rough joints under different contacts was first presented. Then, the meso-parameters used in particle flow simulation were calibrated by axial compression and direct shear tests.A series of numerical direct shear tests of rough jointswere performed under different contact states.The laboratory direct shear tests of artificial joints validated the numerical simulation. Finally, the damage progress of rough joints was analyzed by using the numerical direct shear tests. Results showed that the numerical results agreed well with those of the laboratory tests. The number of microcracks sharply began to increase significantly when the peak shear stress was achieved. Particle flow simulation is an effective tool for the qualitative estimation of the shear behavior of rough joints, particularly peak shear strength. The proposed numerical modeling can easily deal with the non-repeatability of real joints. © 2015 Taylor & Francis Group.


Jin T.,Zhejiang University | Zhang L.,Hunan Electrical Power Design Institute | Luo K.,Zhejiang University | Fan J.,Zhejiang University
Journal of Thermal Science | Year: 2013

Based on the heat and mass transfer theory and the characteristics of general-purpose software FLUENT, a three-dimensional numerical simulation platform, composed of lots of user defined functions(UDF), has been developed to simulate the thermal performance of natural draft wet cooling towers(NDWCTs). After validation, this platform is used to analyse thermal performances of a 220m high super large cooling tower designed for inland nuclear plant under different operational conditions. Variations of outlet temperature of the cooling tower caused by changes of water flow rates, inlet water temperatures are investigated. Effects of optimization through non-uniform water distributions on outlet water temperature are discussed, and the influences on the flow field inside the cooling tower are analyzed in detail. It is found that the outlet water temperature will increase as the water flow rate increases, but the air flow rate will decrease. The outlet water temperature will decrease 0.095K and 0.205K, respectively, if two non-uniform water distribution approaches are applied. © 2013 Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag Berlin Heidelberg.


Jin T.,Zhejiang University | Zhang L.,Hunan Electrical Power Design Institute | Tang L.,Hunan Electrical Power Design Institute | Yi C.,Hunan Electrical Power Design Institute | And 3 more authors.
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2012

Based on the heat and mass transfer theory and the characteristics of the FLUENT software, a three- dimensional numerical simulation platform, composed by lots of user defined functions(UDF), had been developed to simulate the thermal performance in a natural draft wet cooling tower. After validation with experimental data, this platform was used for water-distribution optimization among uniform and two other non-uniform water distribution methods which are usually used in the practical applications. The variations of the flow and temperature field in the cooling tower caused by the three different methods of water distribution were investigated, and the influences on the outlet water temperature were studied in detail. It is found that the outlet water temperature will decrease due to the non-uniform water distribution, and then the efficiency of the cooling tower increases. © 2012 Chin. Soc. for Elec. Eng.


Liu H.,Hunan Electrical Power Design Institute | Lu S.,Hunan Electrical Power Design Institute | Zhang C.,Hunan Electrical Power Design Institute
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | Year: 2011

According to the circuit analysis diagram under different switching modes, considering only four active voltage space vectors without zero voltage space in the TFSAPF, this paper makes duration time of the voltage space vectors U1 and U3 equal to form the zero voltage space vector when amplitudes of U1 and U3 are same while their directions are opposite. A pulse width modulation method based on voltage space vectors is proposed in this paper for three-phase four-switch shunt active power filter (TFSAPF). Some simulations and experiments are completed to verify viability and effectiveness of the proposed SVPWM algorithm.


Song S.,Changsha University of Science and Technology | Xu J.,Changsha University of Science and Technology | Zhang C.,Hunan Electrical Power Design Institute
Advanced Materials Research | Year: 2013

Sustainability is an important concept in today's architecture and will be even more so in the future. This paper explores sustainable design strategies through several cases of campus building. Five strategies of sustainability are studied: context, aesthetic, materials, energy and enhance lives of inhabitants. The conclusions show that sustainable design strategies are naturally producing building with a regional character. The approach varies according to the opportunities and constraints of each project, and with the ecological characteristics of each region. © (2013) Trans Tech Publications, Switzerland.


Liu H.,Hunan Electrical Power Design Institute | Lu S.,Hunan Electrical Power Design Institute | Zhang C.,Hunan Electrical Power Design Institute | Xie K.,Hunan Electrical Power Design Institute
Dianli Zidonghua Shebei/Electric Power Automation Equipment | Year: 2010

For the more effective application of APF (Active Power Filter) in three-phase four-wire system, the basic theory of FBD method is introduced and the FBD-method-based real-time current detection is presented. The reactive current, harmonic current and zero-sequent current of three-phase four-wire system are detected by establishing unit reference voltage vectors. The main circuitry and system principle of APF are researched, the selection rules of DC voltage and DC capacitor are analyzed, the ways to determine the voltage and capacity of power components are presented, the selection principle of output reactor introduced and the structure of control system is given. The application in the industrial field with serious harmonic problem shows its feasibility and validity.

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