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中文摘要：
在研究新能源并网的基础上,分析光伏发电与火电厂捆绑通过高压直流输电并网时,通过光伏并网附加控制抑制直流引起次同步振荡（SSO）的可行性。基于复转矩系数思想设计一种次同步阻尼控制器加在光伏电站主控制器上,在保证光伏电站稳定并网的同时,抑制了直流控制特性引起的SSO,很大程度上提高了电网的稳定性与新能源并网效率。这为在发生SSO而直流附加控制未起作用时提供了一种备选方案。基于PSCAD/EMTDC仿真软件,以南方电网某直流作为实例仿真模型,通过光伏电站并网,在保证光伏电站并网可靠性的同时有效抑制了直流引起的SSO问题。
英文摘要：
The grid-connection of new energy is studied and the feasibility of damping the HVDC-induced SSO（SubSynchronous Oscillation） by the additive controller of photovoltaic grid-connection is analyzed,where the photovoltaic power and the thermal power are combined together and connected to grid through HVDC. An SSDC（SubSynchronous Damping Controller） is designed based on the complex torque coefficient approach and added to the main controller of photovoltaic power station,which ensures the stable photovohaic gridonnection while damps the HVDC-induced SSO,greatly improving the stability of power grid and the gridconnection efficiency of new energy. This can be used as an alternative approach of SSO damping when the SSDC of HVDC doesn＇t work. With a HVDC transmission system of Southern Power Grid as an example, the results of simulation based on PSCAD/EMTDC show that,the grid-connection reliability of photovoltaic power station is ensured and the HVDC-induced SSO is effectively damped.
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