| Rail transit, as an important part of the urban traffic, has been greatly developed inrecent years. The electric energy is the mainly power source of rail transit, so analysis on theelectric consumption utilization of urban rail transit has becomed the development of thepower supply technology on urban rail transit. And introducing the Static Var Generator (SVG)into the rail transit to improve the energy efficiency has very important significance andpractical value, which accords with the trend of energy saving.In this paper, the load characteristics of the urban transportation are studied, and somemetro is found to be fluctuating load. The characteristics are as follows: seriously unevendistribution of the full day load, great fluctuation, large capacitive reactive power, and lowpower factor. So that, the traditional fixed reactive compensation can not meet demand, andthe continuously tunable reactive compensation is used in metro with free switching betweencapacitive and inductive reactive power.The SVG metro power comprehensive treatment is designed for the metro power supplysystem in the paper. It transforms reactive power by high-power electronic devices, such ashigh frequency switchs. The SVG can adjust its value and property of reactive powerautomatically according to the load properties and conditions. It can thoroughly solve thereactive power problem of the metro power supply system to improve power quality.Firstly, it briefly discusses the present status of the urba n transpo rtation and Varcompe nsation technology and introd uces the mainstream reactive compensator. And then, itdescribes the principle of the metro power supply system and analyzes the load characteristics.Meanwhile, the SVG device principle is introduced. Based on the measuerd datas ofQingsheng main substation of Guangz hou Metro No.4Line, the SVG design scheme isproposed by analyzing and calculating concretely the capacities and the value and property ofreactive power. Finally, The feasibility of the design scheme is verified by comparison andanalysis on the simulations. |
