变频变压器在风电并网过程中的频率调整研究

变频变压器(variable frequency transformer,VFT)是一种串联型的灵活交流输电系统设备,也是一种新型智能电网设备.在过去几十年里,我国风力发电是增长最快的新兴可再生能源,但是对于风电并网时的电力系统频率稳定问题也引起了广泛的关注.本文介绍了VFT调节频率的基本原理和转子转速控制设计,并在PSCAD/EMDTC中构建了VFT与风电场的仿真互联模型,进行了对风电并网的仿真实验,着重分析了VFT稳定频率和调节频率的作用.结果表明VFT可以在风电并网中显著提高系统的暂态稳定水平,从而提高风电场的发电能力.

transformer in grid-connecled wind farms transformer in grid-connecled wind farms

Variable frequency transformer(VFT) is a series of flexible AC transmission system equipment, and it also is a new type of smart grid equipment. Over the past few decades, wind power in China is the fastest-growing emerging renewable energy, however, the problem of frequency stability of power system in the grid-connected wind farms is also caused wide attention. The basic principle of VFT adjust the frequency and the design of rotor speed control was introduced, and the simulation model of VFT and wind farm was built in PSCAD/EMDTC, the simulation experiment of the grid-connected wind farms was carried out, the effect of VFT on stabilizing frequency and adjusting frequency was emphatically analyzed. The results show that VFT improve the transient stability level of the system and increase the power generation capacity.