Research on the application of flexible direct-current transmission technology in the system planning integrated with large scale of offshore wind farms

摘要

For offshore wind power there has characteristics of abundant resources, high generating equipment utilization hours, no occupation of lands and suitable for widely extension. During these years, development of offshore wind power has become the hot and cutting-edge trend in China and the word. There has two common system-integrated technologies for offshore wind farms, as high voltage alternating-current (AC) and flexible direct-current (DC) transmission technologies. Because of its advantages such as small occupied area, modular structure, flexible power flow control and suitable for long transmission distance, flexible DC transmission technology has become the main one for deep-sea wind farms which are far away from the seashore to integrate into the onshore transmission power system. Currently there has the national wind power basement with 10 million kilowatts in Jiangsu. How to economic and safety to make large-scale wind farms accessible, especially the deep-sea wind farms, has become a prominent problem for onshore transmission system planning. In this paper the necessity for the offshore wind farms integrated with the flexible DC transmission technology are discussed. After that on the premise of ensuring the stability of the onshore power grid, the application scheme using flexible DC transmission technology in the integration planning of offshore wind farms in Jiangsu is proposed, by means of wind-power optimization distribution method.