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Zhao C.,North China Electrical Power University | Liu T.,North China Electrical Power University | Guo C.,North China Electrical Power University | Ma Y.,Beijing Wanglian HVDC Engineering Technology Co
Dianwang Jishu/Power System Technology | Year: 2011

The building and simulation of main circuit of modular multilevel converter (MMC) can be completed by real time digital simulator (RTDS) under small-step environment. Due to the condition that the insufficient computing power of processors for existing RTDS cannot undertake the simulation of MMC with levels up to the amount of 200, to perform larger-scale simulation by existing computing power of RTDS processors a modeling method is proposed, namely, the MMC models of each phase are packaged individually in small-step environment, then the packaged small-step circuit models of three phases are interconnected to form a whole MMC. Contrast experiments for individually packaged MMC and integrally packaged MMC with the same scale as the former are carried out, and detailed contrast measurement of EMS at both terminals of each small-step model and that of AC and DC voltages of converter are conducted. Simulation results show that the proposed modeling method is feasible, not only the simulation capability can be enlarged, but also the electric quantities in the circuits will not be obviously affected. Source


Zhou S.,North China Electrical Power University | Wen J.,North China Electrical Power University | Cao W.,North China Electrical Power University | Lv S.,North China Electrical Power University | Yin W.-Y.,Beijing Wanglian HVDC Engineering Technology Co
IET Conference Publications | Year: 2012

This paper mainly studies the transient characteristics of the HVDC with capacitor commutated converter (CCC-HVDC) and makes a comparative analysis with the HVDC with conventional converter (LCC-HVDC). The LCC-HVDC and CCC-HVDC models based on the Qinghai-Xizhang HVDC interconnection project are built in the environment of PACAD/EMTDC and their transient characteristics are simulated by imposing a variety of faults. Both with very weak receiving ac network, it indicates that CCC-HVDC scheme has a stronger ability in anti-disturbance and inhibiting the commutation failure when the fault occurs in the inverter side, and has better stability when the fault occurs on the DC line or rectifier side. The CCC-HVDC scheme can effectively overcome the shortcomings of the conventional HVDC link. Source


Zhu S.-Y.,North China Electrical Power University | Wen J.,North China Electrical Power University | Yin W.-Y.,Beijing Wanglian HVDC Engineering Technology Co | Liu B.-H.,Beijing Wanglian HVDC Engineering Technology Co
Advanced Materials Research | Year: 2012

As the ± 800kV Xiangjiaba-Shanghai UHVDC pilot demonstration project has been completion production in China, an UHV AC and DC power era is coming in State Gird. A large number of calculations of main circuit steady state parameters for HVDC system are necessary for both HVDC transmission planning and design and checking DC projects in operation. Therefore, this paper firstly discusses the steady state parameters. Then considering the comprehensiveness of types of HVDC transmission, through digesting design features of foreign similar software, the steady state parameters calculation software for HVDC transmission is developed independently. It has features such as user-friendly interface, real-time calculation and calculation of comprehensive, rapid and accurate, using the mixed programming of Visual C++ (VC++) and MATLAB. Finally, take the ± 800kV Xiangjiaba-Shanghai UHVDC transmission project for example to calculate steady state parameters. The calculation results are accurate to meet the engineering requirements. © (2012) Trans Tech Publications, Switzerland. Source


Wen J.,North China Electrical Power University | Meng W.,North China Electrical Power University | Yin W.-Y.,Beijing Wanglian HVDC Engineering Technology Co | Sun Z.-M.,Beijing Wanglian HVDC Engineering Technology Co | Liu B.-H.,Beijing Wanglian HVDC Engineering Technology Co
Gaodianya Jishu/High Voltage Engineering | Year: 2010

An optimizing programming method for the alternating current (AC) filters is put forward in which result function is the minimum of total investment and annual operation costs of the AC filters accord with the restrictive standards of harmonic distortion. By using the optimizing method, the ±800 kV Xiangjiaba-Shanghai ultra-high voltage direct current (UHVDC) transmission project in China was taken as a trial ultra-high voltage direct current transmission project, and the optimization function of the AC filters, consisting of double-tuned filters, triple-tuned filters, as well as parallel capacitors, was established. And five economical and practical design schemes for the AC filters both in rectifier and in inverter stations were obtained by using the genetic algorithm (GA), respectively. The optimizing programming scheme and the parameters for the AC filters in rectifier and inverter stations of the ±800 kV UHVDC transmission project were presented after comparing with above the five design schemes. The optimizing programming method for the AC filters at converter stations of ultra-high voltage direct current transmission systems is proved to be reasonable. Source


Pan W.,Hohai University | Liu X.,State Power Environmental Protection Research Institute | Nie D.,Beijing Wanglian HVDC Engineering Technology Co | Chen J.,Guodian Nanjing Automation Co.
Dianli Zidonghua Shebei/Electric Power Automation Equipment | Year: 2011

According to the basic insulation coordination method of UHVDC converter station and the requirements of engineering, a design & calculation software is developed for it with Excel and its VBA editor, including different functions, such as the selection of arrester arrangement scheme, modification and storage of parameters, calculation of insulation level, inquiry of arrester characteristic curves, etc. It is used in the design and calculation of insulation coordination for a ±800 kV UHVDC converter station. Case study shows that it is flexible, fast, accurate, convenient, user-friendly and adaptable. Source

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