事故备用分散转移的实现方式

Realization Mode of Decentralized Transfer of Contingency Reserve

随着大量可再生能源并网和直流投运,导致系统惯性降低、事故备用短缺、低频风险增大。为了解决该问题,提出了事故备用分散转移(DTCR)的实现方式,能够支持发电侧事故备用向用电侧分散转移。首先,给出了DTCR的系统设计和实现思路。然后,提出了一种支持DTCR的毫秒级电器级负荷频率控制方法,其核心是三阶段响应策略:瞬时保守响应(ICR)、可靠延时响应(RLR)和最优动态控制(ODC)。为了兼顾ICR的瞬时性和准确性,提出了一种考虑电器优先级和功率差异的本地侧零通信主动响应形式。为了增强ICR的试错能力,提出了保守响应量的整定公式,能够利用最少负荷资源避免频率低于危险阈值,同时最小化误动作带来的频率冲击。最后,通过修改的IEEE 39节点系统仿真验证了该方法的有效性。DTCR方案有助于缓解事故备用负担和提升系统安全性。

With the grid connection of large-scale renewable energy and DC operation,the inertia of the power system is reduced,the contingency reserve is of shortage,and the low-frequency risk increases.To solve these problems,this paper proposes the realization mode of decentralized transfer of contingency reserve(DTCR) to support the transfer of contingency reserve from the supply side to the demand side.Firstly,the system design and realization idea of DTCR are given.Then,a millisecond-level appliance-level load frequency control method supporting DTCR is proposed.The core of the method is a three-stage response strategy,including instantaneous conservative response(ICR),reliable latent response(RLR) and optimal dynamic control(ODC).A local-side zero-communication active response form considering the appliance priority and power difference is proposed to balance the instantaneity and accuracy of ICR.Moreover,the setting formula of conservative response capacity is proposed to enhance the trial-and-error ability of ICR,which can prevent frequency from falling below the dangerous threshold using the minimum load resources,while minimizing the frequency shock caused by misoperation.Finally,the effectiveness of the proposed method is verified by the simulation of a modified IEEE 39-bus system,which demonstrates that the proposed DTCR method is helpful to alleviate the contingency reserve burden and improve the system security.