基于成本-稳定均衡控制的柔性直流构网系统优化运行

Optimal Operation Based on Cost-Stability Equilibrium Control of Flexible DC Grid-Forming System

中文关键词:多端柔性直流输电  多目标潮流优化  下垂控制  多目标水母搜索算法

keywords:multi-terminal flexible DC transmission  multi-objective power flow optimization  droop control  multi-objective jellyfish search algorithm

中文摘要:针对高比例新能源接入背景下交流电网传输效率与稳定性不足的问题，提出一种基于成本-稳定均衡控制的柔性直流构网系统优化运行方法。首先，结合经济性、稳定性需求，构建计及运行成本和系统稳定性的多目标优化指标体系；其次，提出基于成本-稳定均衡控制的电压源换流站控制方法，建立含电压源换流器的柔性直流构网系统多目标潮流优化模型；再次，提出基于知识驱动的多目标水母搜索算法，并在下垂控制中根据换流站功率裕度和能效损耗进行改进，实现分区成本、网络损耗、电能质量及系统稳定性的协同优化；最后，搭建仿真模型并对所提方法进行验证。实验结果表明：所提方法可显著提升系统效率和稳定性，且具备较强的抗噪声能力。

Abstract:To address the low transmission efficiency and insufficient stability of AC power grids with high-penetration renewable energy access，this paper proposes an optimal operation method for flexible DC grid-forming systems based on cost-stability equilibrium control. First，considering economic efficiency and system stability，a multi-objective optimization index system is established with operating cost and system stability taken into account. Second，a control strategy for voltage source converter（VSC） stations based on cost-stability equilibrium control is presented，and a multi-objective power flow optimization model is built for flexible DC grid-forming systems containing VSCs. Third，a knowledge-driven multi-objective jellyfish search algorithm is proposed. Combined with the power margin and energy loss of converter stations，the droop control strategy is improved to realize the coordinated optimization of regional operation cost，network loss，power quality and system stability. Finally，a simulation model is established to verify the proposed method. The results show that the proposed method can effectively improve the overall efficiency and stability of the system，and possesses strong anti-interference capability.