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Luo Z.-P.,Inner Mongolia University of Technology | Liu Y.-H.,Inner Mongolia University of Technology | Yang B.-F.,Inner Mongolia Electrical Power Research Institute
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2014

This paper presents a novel MLCR-CSC-STATCOM topology, particularly suitable for the high power applications. Injection control technology, multi-level technology and zero level technology are used, which enables main bridge switch working in fundamental frequency to output continuous controllable AC current and high-quality current waveforms and meantime better resolve the absorption capacitance problems of conventional CSC without installing AC capacitor. This paper derives the mathematical model of MLCR-CSC-STATCOM, adopts feedback control linearization means for the affine CSC-STATCOM equations and replaces the nonlinear control design with linear state equation design. By use of PSCAD/EMTDC tools, the established model of MLCR-CSC STATCOM is simulated and some specific conclusions are drawn.

Liang G.,Inner Mongolia Electrical Power Research Institute
China International Conference on Electricity Distribution, CICED | Year: 2014

As the further growth in electricity using of Chinese urban residents, in order to meet the requirements of the city, more and more 220kV transformer substations have been constructed in the city as distribution substations. the character of such substations are: 220kV and 110kV high-voltage electrical equipment use GIS; substation area is small; the increasing power system capacity caused short circuit current of grounding fault growing. The outstanding issues of substation grounding design is that the ground area is small (5000 ∼ 10000m2), and soil resistance rate is high (normally 500 ∼ 1200Ω · m or higher). There is no external ground conditions laid and local geological conditions are poor, and soil receptivity is high. Substation using reducing agent make the grounding grid of substation corroded very serious; soil around the net salinity and soil moisture make serious corrosion of the grounding. © 2014 IEEE.

Zhao G.,Shandong University | Chen H.,Shandong University | Chen H.,Inner Mongolia Electrical Power Research Institute | Zhang C.,Shandong University | Guan Y.,Shandong University
International Journal of Advanced Manufacturing Technology | Year: 2013

The extrusion die plays a crucial role in aluminum alloy profile production, which influences product quality and service life of extrusion die directly. In this paper, a profile with irregular shape was taken as an analysis example, and multiobjective optimization for porthole extrusion die based on modern intelligence algorithm was carried out. Aiming at achieving the uniform velocity distribution in the cross-section of the profile as well as decreasing the maximum stress on the extrusion die and the deflection of the mandrel, the angle between port bridges, the position of die orifice, and the height of welding chamber were considered as the design variables. Then Kriging model was established on the basis of Latin hypercube samplings, and above design variables were optimized using Pareto-based genetic algorithm. Finally, an optimal die structure is gained. Compared with the initial scheme, the velocity distribution in the extrudate was more even, and the stress on the die and the deflection of the mandrel were decreased obviously in the optimal scheme. The optimal design method for porthole die has strong commonality, thus, it could give useful guidelines for practical production of the same kind of aluminum profile. © 2013 Springer-Verlag London.

Chen S.-H.,Inner Mongolia Electrical Power Research Institute | Ruan D.-B.,China Southern Power Grid Co.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2013

For the problem of low accuracy of photovoltaic power low prediction, this paper puts forward the algorithm of forecasting active power of wavelet neural network based on Markov modification. This paper divides the historical data into sunny, cloudy weather types, trains them respectively, and establishes network model, and then according to the prediction of daily weather forecast, uses different model prediction algorithms. Large-scale grid-connected photovoltaic power will cause great disturbance on the balance of power system, so the accurate prediction of dispatching department by photovoltaic power and advanced control on the automatic generation control can effectively reduce the frequency fluctuation and reduce the regulating pressure of automatic generation control unit. Practical examples are presented to validate the algorithm and frequency recovery characteristics under active disturbance are simulated, which show that ahead control of automatic generation control based on photovoltaic power generation prediction is effective.

Liang G.,Inner Mongolia Electrical Power Research Institute
2010 China International Conference on Electricity Distribution, CICED 2010 | Year: 2010

This paper discusses current grounding design issues of present electric power plants, transformer substations in high soil resistivity area, by incorporating the actual engineering data of a 220KV substation, analyzes the impact degree of grounding design parameters to earth potential, contact potential, and step potential. It also can be used as a reference point for peers to discuss in engineering design. © 2010 Chinese Soc for Elec Eng.

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