Energy saving and voltage control of user side in URBAN distribution NETWORK of Shanghai

With the development of grid, the difference between peak load and valley load is more and more significant in mega-cities, making the regulation of voltage more and more difficult. Besides, users´ reactive power compensation is unreasonable and often leads to the increased line losses and difficulties of voltage upward. This paper analyses the status quo of operation of reactive power in downtown and suburban areas of Shanghai. The main contradiction is noted that the current reactive power demand during peak hours is low as well as a large excess of valley hours. Based on the development requirements of the smart grid, it is pro posed to further enhance the energy saving benefits of the whole society. It is necessary to strengthen the assessment of users´ reactive power. The assessment criteria of send d own reactive power should be standardized. It is also necessary to put forward the power factor requirements for users mentioned in the “Grid Corporation of power system voltage and reactive power quality regulations” which is issued by National State Grid Corporation in 2009.