廖勇;庄凯;姚骏;

• 1:输配电装备及系统安全与新技术国家重点实验室(重庆大学)

摘要(Abstract)：

电网电压不平衡条件下,电压负序分量将导致直驱式永磁同步风电机组(permanent magnet synchronous generator,PMSG)全功率并网变流器的直流侧电压出现2倍电网频率的谐波,长期处于此工况下将显著影响直流侧电容的使用寿命,危及机组的稳定运行。建立了电网侧变流器的数学模型,在计及并网阻抗对有功功率影响的基础上,提出了一种以增强直流侧电压稳定性为目标的控制策略。其中,电网侧变流器正负序电流指令通过保证直流侧电容及并网电抗器之间无2倍频振荡的有功功率流得到,指令的计算无需求解复杂的高阶矩阵,也没有引入更多的变量。由直驱式永磁同步风电机组的仿真结果验证了所提出的电压控制策略的有效性。与传统的平衡控制策略相比,这种控制策略能在实现直流侧电压稳定控制的同时,使输出至电网的有功功率2倍频波动得到有效抑制,提高了该型机组不平衡电网电压条件下不间断安全稳定运行能力。

关键词(KeyWords)： 风力发电;全功率变流器;不平衡电网电压;直流侧电压控制;谐波

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(51007097)~~

作者(Author): 廖勇;庄凯;姚骏;

Email:

DOI: 10.13335/j.1000-3673.pst.2012.01.020

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