Now, China is building 7 wind power bases with the capacity over ten million kilowatts, and the large scale wind power transmission is essential due to the unbalance distribution of sources and loads. Series compensated AC transmission and high voltage DC transmission (HVDC), as two main transmission modes, may lead to sub-synchronous oscillation when they are applied to wind power transmission. The structural characteristics of wind turbine generators were analyzed in this paper, including squirrel cage induction generator (SCIG), doubly-fed induction generator (DFIG) and permanent magnetic synchronous generator (PMSG). Three kinds of sub-synchronous oscillation, i. e. sub-synchronous resonance (SSR), sub-synchronous oscillation caused by electronic devices (SSTI), and sub-synchronous oscillation caused by controllers of wind turbines (SSCI) were clarified. In addition, the possible types of sub-synchronous oscillation for the different kinds of wind turbine generators were also discussed. Finally, the urgent problems need to be studied were analyzed as well.%目前,中国正在建设7个千万kW级风电基地,大规模风电外送成为必然.串补交流输电和高压直流输电作为风电外送的2种重要方式可能会诱发次同步振荡问题.分析鼠笼异步型,双馈感应型和永磁同步型风电机组的结构特点,论述次同步谐振、装置引起的次同步振荡以及风电机组控制器引起的次同步振荡,并分析总结不同类型风电机组可能发生的次同步振荡类型.最后,指出亟待研究解决的问题.
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