纯清洁能源下水电高占比送端电网频率稳定协调控制策略研究

含大容量密集型直流的送端电网在实现纯清洁能源转型后，其转动惯量和有功调节能力将大幅下降，进一步加剧直流闭锁故障时的频率失稳风险。为保障水电高占比送端电网在纯清洁能源形态下的频率稳定性，提出一种统筹考虑虚拟惯量、需求响应、直流调制和稳控切机的多阶段协调控制策略。以规划的四川中长期目标网架为基础，分析了该电网在纯清洁能源形态下发生直流单极、双极、多极闭锁故障后的频率稳定特性，并通过BPA仿真验证了所提频率稳定协调控制措施的有效性。

Coordinated Frequency Stability Control Strategy of Sending-end Power Grid with High Hydro Generation Proportion in 100% Clean Energy Generation

The rotational inertia and active power regulation capacity will decrease after large capacity intensive DC sending end power grid achievives 100% clean supply energy， that will increase the risk of system frequency instability when system suffers high voltage direct current（HVDC） faults blocks. To improve the frequency stability performance where this 100% clean sending end power gird with plentiful hydro generation， a multistage coordination control strategy is proposed which simultaneously combines the DC frequency limit control （FLC）， virtual inertia （VI）， demand response （DR） and stability control generator tripping. Based on the Sichuan power gird medium and long-term objective grid，the frequency stability characteristic is analyzed after monopole， bi-polar， tri-polar block faults respectively occurrs on HVDC lines with 100% clean energy form. Finally，BPA simulation results demonstrate the effectiveness of the proposed stability control.