State Power Economic Research Institute

Beijing, China

State Power Economic Research Institute

Beijing, China
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Qiao J.,Tsinghua University | Zou J.,Tsinghua University | Yuan J.,Tsinghua University | Li B.,State Power Economic Research Institute
Dianwang Jishu/Power System Technology | Year: 2017

It is an efficient technology to build HVAC and HVDC transmission lines on the same tower in area with insufficient right of way, where electromagnetic environment is an important issue. In this paper, domain decomposition method based on stationary simplification is applied to compute electric field and ion current density on ground level. The second-order elements are used in ambient space of conductors while the first-order ones are applied in space far away from the conductors. D-N algorithm is used to compute coupling in each domain. A new iteration scheme is proposed based on corona discharge U-I curve. Ion density is updated with calculated voltage ratherthan electric field strength. Thus error caused by interpolation in one element is reduced. Results obtained with this method are compared with previous data, showing that the proposed domain decomposition method based on simplification of zero ac voltage can be used to predict electric field of hybrid lines with computation efficiency improved significantly. © 2017, Power System Technology Press. All right reserved.


Li B.,State Power Economic Research Institute | Qiao J.,Tsinghua University | Zou J.,Tsinghua University | Yuan J.,Tsinghua University
Dianwang Jishu/Power System Technology | Year: 2017

Hybrid electric field of ac/dc transmission lines on the same tower is a most important factor for line configuration design. Lateral profile of electric field on ground has close relationship with superposition and distribution of ac and dc component. In this paper, hybrid electric field and ion current are calculated and analyzed for double-circuit 330 kV or 750 kV ac lines and ±1100 kV dc lines on the same tower with different configuration and phase sequences. Minimum conductor heights and corridor widths are also computed. Results show that electric field profile on ground level can be categorized into three regions: ac, hybrid and dc. 'Inverted triangle' and 'vertical' structures are proposed to be used to separate positions of peak values of dc and ac components. Corridor widths are determined by ac field for 750 kV lines while by both ac and dc fields for 330 kV ac lines. Finally, configurations I (phase sequences 6) and II (phase sequences 4) are proposed for hybrid ac/dc lines on the same tower. © 2017, Power System Technology Press. All right reserved.


Wang Q.,Hong Kong Polytechnic University | Niu S.,Hong Kong Polytechnic University | Yang L.,State Power Economic Research Institute
IEEE Transactions on Industrial Electronics | Year: 2017

This paper systematically studies a new kind of PM machines with both stator and rotor PM excitations, namely, dual-PM excited machines. The key is to rely on the PM-iron structure in the machine to provide both PM excitation and flux modulation. Besides the fundamental field component in the air-gap, some other predominant harmonics introduced by the flux modulating effect can also contribute to the electromagnetic torque production. Therefore, this kind of machines can be designed with high torque density. Four dual-PM excited machine concepts with the same rotor configuration but different stator structures are comparatively studied, which include double-stator PM machine(DSPM), stator multi-tooth-PM machine(SMTPM), stator slot-PM machine(SSPM) and stator tooth-PM machine(STPM). Based on the flux modulating effect, the general design principle of the dual-PM machines is proposed in this paper. Through analytically investigating the air-gap field harmonics, the physical insight of the dual-PM machines is brought forward. All the four machines are optimized using an improved Tabu search coupled with finite element method (ITS-FEM), and their electromagnetic performances are comprehensively studied and compared. A prototype of STPM is manufactured. Experimental tests are conducted and the results well verify the electromagnetic design. IEEE


Wang J.,Argonne National Laboratory | Bloyd C.N.,Pacific Northwest National Laboratory | Hu Z.,State Power Economic Research Institute | Tan Z.,North China Electrical Power University
Energy | Year: 2010

The escalating demand for electricity in China has caused an electricity shortage in the past several years. This paper discusses the role of demand response (DR) as an integral component in alleviating the problem and coping with this shortfall. It reviews current experience with DR programs, analyzes China's situation and makes suggestions for DR implementation. Although China's DR programs offer high potential to succeed, they require substantial efforts in resolving such key issues as the programs' funding mechanisms, pricing, and relationship with electricity industry reform.


Zhang L.,State Grid Corporation of China | Ye T.,State Grid Corporation of China | Xin Y.,State Grid Corporation of China | Han F.,State Power Economic Research Institute | Fan G.,China Electric Power Research Institute
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2010

Large scale wind power development is an important strategic choice in China's new era. Aiming at problems which were brought by wind power integration, comparison was made with the foreign experience. It was pointed out that, the wind power in China had some distinct characteristics such as large scale, centralized development, long-distance and high voltage transportation, which resulted in some problems in operation and control, i.e. system frequency regulation, peak regulation, wind power prediction and LVRT (low voltage ride-trough) and so on. Then some comparisons in policy, wind power integration requirement, test and certification were made, and the existing problems were pointed out. In the end some relevant measures against large scale wind power integration were put forward. © Chinese Society for Electrical Engineering.


Xiao Z.-H.,State Power Economic Research Institute
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2014

High reliability and measurement accuracy are the premises and foundations of the practical use of optical transformer in power systems. Based on the theory of power optic sensor and model structure, the implementation plans for magneto-optical glass type as well as all-fiber type current transformer and electro-optic crystal type as well as all-fiber type voltage transformer are classified and compared, the advantages and disadvantages in the aspects of detection algorithms and manufacturing processes are also pointed out. Finally, the problems associated with the practical use of optical sensing technology and research directions are discussed.


Sun K.,State Power Economic Research Institute
Dianwang Jishu/Power System Technology | Year: 2011

Present condition of energy resources in China is analyzed and the prospect of applying UHV half-wavelength AC power transmission in China is discussed. By means of calculating annual cost of unit capacity, the economy of UHV half-wavelength AC power transmission is compared with that of UHVDC power transmission, and the results show that the UHV half-wavelength AC power transmission is more economical than the ±800 and ±1000 kV UHVAC power transmission. The social benefit of the UHV half-wavelength AC power transmission is analyzed, the upper-limit of control cost for UHV half-wavelength AC power transmission is given, and the sensitivity analysis on wiring mode of power plant and transmission capacity is performed.


Chen W.,State Power Economic Research Institute
Dianli Zidonghua Shebei/Electric Power Automation Equipment | Year: 2016

As the energy storage, EVs(Electric Vehicles) are combined with the distributed wind farms to form a VPP(Virtual Power Plant) for participating in the day-ahead electricity market. An optimal operation model of VPP in electricity market is established and the rolling time-domain analysis is applied to compare the profit between VPP without EVs and VPP with EVs. Because EV and wind farm have different owners, a mechanism of compensation for EV owners due to the wastage of EV battery is analyzed. Case analysis shows that, the profit of VPP with EVs is greatly improved and the proposed compensation mechanism effectively motivates the EV owners to take part in the operation of VPP. © 2016, Electric Power Automation Equipment Press. All right reserved.


Ma W.,State Power Economic Research Institute | Nie D.,State Power Economic Research Institute | Cao Y.,State Power Economic Research Institute
Gaodianya Jishu/High Voltage Engineering | Year: 2012

Based on the consultation and study for Xiangjiaba-Shanghai ±800 kV UHVDC(ultra high voltage direct current) project, this paper presents an optimal design for key technique solutions. In this paper, the DC system electrical scheme design, the DC filter design, the DC harmonic component suppression, the over voltage and insulation coordination, the requirements for converter station equipment, the main equipment technical parameters of equipment (including thyristor valve, converter transformer, smoothing reactor, DC breaker), the configuration of measuring device and DC control protection system, and the de-icing operation design are investigated. According to the UHVDC technology researched conclusions and the development of the project construction, the UHVDC system design for converter stations becomes an optimal combination. The optimized design solves numbers of technical problems of the world's first UHVDC project, and it is applied to the project's construction. Under the actual operating condition, the optimized design is proved to be correct and superior. These optimal design conclusions are impartment for developing UHVDC technique and equipment, and provide reference for future UHVDC projects.


Billinton R.,University of Saskatchewan | Karki R.,University of Saskatchewan | Gao Y.,State Power Economic Research Institute | Huang D.,Manitoba Hydro | And 2 more authors.
IEEE Transactions on Power Systems | Year: 2012

There is a wide range of possible data representations, models and solution techniques available when conducting adequacy assessments of wind integrated generation or composite generation and transmission systems. This paper presents some of the basic factors and procedures that need to be considered when conducting wind integrated system adequacy assessment. Focus is placed on possible wind speed data models, wind energy conversion system models and their application in generation and bulk system adequacy evaluation. © 1969-2012 IEEE.

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