传统与送端水火电基地相匹配的直流输电通常能够主动适应受端的负荷特性，未来在新能源大基地模式下，受端电网则需要适应经直流耦合的送端新能源波动特性。根据“十四五”规划，南方区域将形成云南、藏东南同时馈入中东部受端电网的异步互联形态，藏东南直流日内波动特性对受端频率稳定风险具有显著影响。一方面，当前以季节典型场景为基础的频率稳定工程校核受到严峻挑战。另一方面，直流、新能源等非同步电源高渗透小时数剧增造成常规调频备用匮乏，大容量直流闭锁下受端电网低频风险突出。因此提出了一套适应藏东南受端系统的频率稳定性分析框架，首先设计了基于时序生产模拟和静态风险指标的场景生成和缩减方法，确定了典型频率高风险场景。随后结合南方区域新型资源禀赋特点提出了基于资源复用的多调频资源协调配合体系，提升了高风险场景下的频率稳定水平。通过2025年藏东南规划数据循序渐进地验证了设计方案的合理性和有效性。

Conventional HVDCs that match the hydropower and thermal power bases at the sending end are typically capable of actively adapting to the load characteristics at the receiving end. However, in the case of the receiving grid under the development of large-scale renewable energy bases, it needs to adapt to the fluctuating characteristics of the renewable energy at the sending end through HVDC coupling. According to the "14th Five-Year Plan", the China Southern Area will develop an asynchronous interconnection architecture where Yunnan and Southeast Tibet simultaneously deliver power to the central-eastern receiving-end grid. The frequency stability risks in the receiving-end grid are significantly influenced by the intraday fluctuation characteristics of Southeast Tibet HVDC. On one hand, existing frequency stability engineering verification methods based on seasonal typical scenarios face severe challenges. On the other hand, the dramatic increase in high-penetration hours of non-synchronous sources (e.g., HVDCs and renewable generation) leads to insufficient conventional frequency regulation reserves, exacerbating low frequency risks in the receiving-end grid during large-capacity HVDC blockings. This paper proposes a frequency analysis and control scheme for the receiving end of Southeast Tibet. It involves scenario generation and reduction methods based on time series production simulation and a static risk index. Besides, it also includes a resource reuse-based frequency control system dominated by multi-resource coordination, according to the new resource endowment of the China Southern Area. The rationality and effectiveness of the above scheme are gradually validated based on the 2025 planning data concerning Southeastern Tibet.