1. School of Electrical Engineering Wuhan University Wuhan 430072 China; 2. Central Southern China Electric Power Design Institute Co. Ltd China Power Engineering Consulting Group Corporation Wuhan 430072 China; 3. Central China Electric Power Dispatching and Communication Center Wuhan 430077 China
Abstract：As the main transmission way of large-scale renewable energy resources, the form of wind power and solar power integrated grid by HVDC plays an important role in consuming new energy elsewhere. However, it also brings the potential risk of subsynchronous / super-synchronous oscillation (SSO/SupSO). The problem of SSO/SupSO caused by wind power, especially for the problem of damping coupling among machine-side controller (MSC)/grid-side controller (GSC) parameters of the direct-drive permanent magnet synchronous generator (DD-PMSG) and sending-end controller (SEC) / receiving-end controller (REC) parameters of VSC-HVDC, is still to be studied in depth. Based on the background mentioned above, this paper optimizes the controller parameters of the wind power integrated system by VSC-HVDC to suppress the SSO/SupSO, and transforms the damping coupling issue into the controller parameters coordination optimization issue. In detail, the dominant controller parameters are taken as the optimization variables in this paper. And the oscillation modes for improvement are selected as the objective modes. Maximizing the damping ratios of the objective modes is the optimization object. Then, the coordinated optimization model of the dominant controller parameters is established. The I-PGSA algorithm which has excellent performance in convergence speed and global searching ability is used to solve the coordinated optimization model, and the optimal controller parameters are obtained. The model tracking technique is used to track and lock the objective modes in the process of coordinated optimization, which makes the process of optimization more pertinent. The concept of dynamic damping ratio is further proposed, which is contained in constrains. It realizes the dynamic setting in the threshold of damping ratio of each oscillation mode in the process of optimization, which makes the process of optimization more rational. Finally, the time domain simulation based on PSCAD/EMTDC proves the effectiveness and superiority of the proposed coordinated optimization strategy.
盛逸标,林涛,陈宝平,陈汝斯,郭紫昱,徐遐龄. 面向新能源外送系统次/超同步振荡的控制器参数协调优化[J]. 电工技术学报, 2019, 34(5): 983-993.
Sheng Yibiao, Lin Tao, Chen Baoping, Chen Rusi, Guo Ziyu, Xu Xialing. Coordination and Optimization of Controller Parameters for Subsynchronous/Super-Synchronous Oscillation in New Energy Delivery Systems. Transactions of China Electrotechnical Society, 2019, 34(5): 983-993.
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2019, Vol. 34 
