随着风力发电等新能源并网容量的增加,大功率电力电子技术的广泛采用,以多源多变换复杂交直流系统为组成架构的新能源电力系统逐渐形成,由此引发的次同步振荡新问题不断凸显,次同步振荡的概念和内涵不断延伸,它们的起因、表现形式、影响程度、监测和抑制方法等诸多错综复杂的问题再一次引起世界范围的广泛重视.本文首先总结新能源电力系统次同步振荡的基本问题与发展态势,并剖析我国次同步振荡问题的特点与表现,最后提出当前次同步振荡研究中的新问题,以及在抑制技术等方面面临的挑战与应对措施,以期推动我国次同步振荡问题的研究.%With the increasing penetration of renewable energy sources, especially the wind power generation, and broad application of the high-power power electronic technology, electric power system with renewable energy sources is evolved, which is constituted by complicated AC-DC system with multi energy resources and multi conversions. As a result, new subsynchronous oscillation (SSO) problems are prominent constantly. The concept and connotation of SSO is extended gradually. And various intricate issues, such as their causes, forms, impact, monitoring and countermeasures attract wide attention throughout the world again. This paper firstly summarizes the basic issues and development trend of SSO, and analyzes the characteristics and forms of SSO problems in China. Finally, new issues of current SSO research, challenges ahead, especially in mitigation measures, and the corresponding strategies are put forward, aiming at promoting the SSO study in China.
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