海上柔性直流输电工程直流电压等级确定方法

Method of DC Voltage Level Determination for Offshore VSC HVDC Transmission Project

摘要:

随着海上风电机组大型化以及投资规模的不断扩大和建设成本逐渐下降，近海风电资源日趋紧张，基于柔性直流输电技术的大规模、远距离海上风电送出工程得到了较大的应用。在海上风电柔性直流输电工程中，直流电压等级是体现输送能力的重要技术参数。文中基于IGBT器件的稳态和暂态通流能力以及直流海缆载流量限制要求，提出了一种海上风电柔性直流输电工程的直流电压等级确定方法。并在此基础上，以某900 MW海上风电柔性直流输电工程为例，给出了工程案例的直流电压等级确定流程。所提出的海上风电柔性直流输电工程的直流电压等级确定方法，有利于降低工程建设成本并推进中国远海风电大规模集约开发与并网技术的发展。

Abstract:

With the increasing of the scale of offshore wind turbines and investment and the gradual decline of construction costs, offshore wind power resources are becoming increasingly scarce. Large scale and long distance offshore wind power transmission project based on voltage source converter based high voltage direct current (VSC-HVDC) technology have been widely deployed. In offshore wind power VSC-HVDC transmission project, the DC voltage level is an important technical parameter to reflect the transmission capacity. Based on the limitation requirements of steady state and the transient ampacity of IGBT devices as well as DC marine cables, a method for determining DC voltage level of offshore wind power VSC-HVDC transmission project is proposed. On this basis, taking a 900 MW offshore wind power VSC-HVDC transmission project for example, the process of determining DC voltage level of the engineering case is given. The proposed method is conducive to reducing construction costs, which is of great significance to promote the large scale intensive development of offshore wind power and the development of gridintegration technologies.