Addressing voltage violations and renewable energy absorption bottlenecks arising from high-penetration photovoltaic (PV) integration, this paper proposes a hierarchical optimisation architecture for a Hybrid Energy Storage System (HESS) based on microgrid-distribution network coordination to enhance collaborative regulation of energy storage across multiple microgrids. The methodology comprises a PV hosting capacity assessment model and an HESS operation model that accounts for power supply reliability, forming a two-layer planning framework that integrates distributed decision-making with centralized coordination. At the microgrid level, HESS capacity is determined to minimise the local comprehensive cost, while the allocation ratio between lithium-based and hydrogen-based energy storage is optimised to maximise renewable energy utilization. At the distribution network level, a global collaborative dispatch of multi-microgrid energy storage is performed to minimise total system cost and voltage deviation, thereby achieving cross-regional power balance and voltage support. Simulation verification is conducted using actual distribution network data from Zhejiang Province and a 33-node test system. The results indicate that the proposed coordinated operation strategy can effectively improve voltage quality, enhance the PV absorption rate, and increase economic benefits.
Xin et al. (Thu,) studied this question.