论文标题
最佳的紧急频率控制基于多进食混合AC-DC系统中的协调下垂
Optimal Emergency Frequency Control Based on Coordinated Droop in Multi-Infeed Hybrid AC-DC System
论文作者
论文摘要
在多进食混合AC-DC（MIDC）系统中，区域网格之间的异步互连，复杂的系统动力学和可能的级联故障对频率稳定性产生了巨大影响。为了应对紧急情况下的频率不稳定问题，本文提出了基于MIDC系统协调下垂的分散的紧急频率控制策略。首先，引入了用于LCC-HVDC系统的P-F下垂控制，并设计了LCC-HVDC系统和发电机之间的协调下垂机制。然后，为了合理地分配LCC-HVDC系统和发电机之间的功率不平衡，制定了最佳的应急控制（OEFC）问题，并以分散的方法选择最佳的下垂系数，该方法可以处理各种控制目标。 Lyapunov稳定性分析表明，考虑到LCC-HVDC动力学，闭环平衡在局部渐近稳定。通过模拟验证了拟议的紧急控制策略的有效性。
In multi-infeed hybrid AC-DC (MIDC) systems, the asynchronous interconnection between regional grids, the complicated system dynamics and possible cascading failures have an enormous effect on the frequency stability. In order to deal with the frequency instability problems in emergency situations, this paper proposes a decentralized emergency frequency control strategy based on coordinated droop for the MIDC system. First, a P-f droop control for LCC-HVDC systems is introduced and the coordinated droop mechanism among LCC-HVDC systems and generators is designed. Then, to reasonably allocate the power imbalance among LCC-HVDC systems and generators, an optimal emergency frequency control (OEFC) problem is formulated, and the optimal droop coefficients are selected in a decentralized approach, which can deal with various control objectives. A Lyapunov stability analysis shows that the closed-loop equilibrium is locally asymptotically stable considering the LCC-HVDC dynamics. The effectiveness of the proposed emergency control strategy is verified through simulations.
