在构建以新能源为主体的新型电力系统背景下，随着大规模海上风电等可再生能源不断接入输电网，其安全稳定运行正面临新的挑战。为此，提出一种面向电力电量时空平衡的海陆互联系统双层优化分区方法。首先，依据阻抗、线路权重以及功率交互熵三个指标提出了一种能更好反映高比例新能源接入场景下节点电气联系强弱的广义电气距离。其次，提出一种双层优化方法，上层为以最小电气联系指标为目标函数的电网最优分区模型，下层为海陆互联系统的电力电量平衡模型，目标函数为系统总成本最小，通过双层迭代求出最优解。最后，在改进的IEEE 24 节点系统上进行仿真分析，验证了所提方法的有效性和优越性。

Under the trend of building a new power system, large-scale integration of off-shore wind energy into the transmission network presents new challenges to the safe operation of the grid. This paper proposes a two-level optimal partition approach for offshore-onshore interconnection system considering spatial-temporal electricity balance. First, a generalized electrical distance is proposed based on three indicators: impedance, line weight, and power interaction entropy, which can better reflect the strength of electrical connections between nodes in high-renewable scenarios. Second, a two-level optimization method is proposed to iteratively obtain the optimal solution. While the upper-level model is grid partitioning optimization with the minimum electrical connection index as its objective function, the lower-level optimal power balance model is to minimize the total offshore-onshore interconnection system cost. Finally, simulation analysis is conducted on the improved IEEE 24-bus system to verify the effectiveness and superiority of the proposed method.