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一些新建的大型煤电基地由于采用较高固定串补度的厂对网远距离大容量输电模式,所引发的多模态次同步谐振(SSR)正成为威胁机组安全和电网稳定的现实难题。以上都电厂串补输电工程(二期)为例,阐述多模态SSR的发生机理,分析采用附加励磁阻尼控制(SEDC)抑制多模态SSR的基本原理及其相对于其他措施的特点和优势,并重点探讨SEDC研发中面临的关键技术问题及其解决思路,为中国自主研发和应用SEDC设备解决SSR问题奠定基础。
Some newly built large-scale coal-fired power bases are being challenged by the multi-mode subsynchronous resonance (SSR) that is triggered by long-distance high-capacity power transmission mode with high fixed-line series compensation degree, which is becoming a real challenge for unit safety and grid stability. The above are all examples of power plant series transmission project (Phase II), the mechanism of multi-mode SSR is described, the basic principle of using additional excitation damping control (SEDC) to suppress multi-mode SSR and its characteristics and advantages relative to other measures , And focuses on the key technical issues facing SEDC research and development and their solutions to lay the foundation for China to independently develop and apply SEDC equipment to solve SSR problems.