Direct-current bus voltage stabilization system and method of alternating-current and direct-current micro-grid

By constructing a system architecture that combines hybrid energy storage coordination and power coordination, and adopting a hierarchical collaborative control strategy, the voltage instability problem caused by distributed power fluctuations and load mutations in DC microgrids was solved, achieving efficient and stable control of DC bus voltage and improving the dynamic stability of the system.

CN121749095APending Publication Date: 2026-03-27SHIHEZI UNIVERSITY +2
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Patent Information

Application Number
CN202512048825.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-31
Publication Date
2026-03-27

AI Technical Summary

Technical Problem

In existing DC microgrids, the DC bus voltage instability caused by power fluctuations of distributed power sources and sudden load changes makes it difficult for current technologies to achieve synergy between hardware architecture and control strategies, resulting in delayed regulation response and reduced energy storage efficiency.

Method used

A system architecture that integrates hybrid energy storage and power coordination is constructed. A hierarchical collaborative control strategy is adopted, and precise voltage control across multiple time scales is achieved through photovoltaic SiC converters, energy storage branch characteristic adaptation circuits, and inverter-side filtering and pre-charging circuits, combined with a dedicated control unit.

Benefits of technology

It significantly improves the dynamic stability, operational reliability, and adaptability to high proportions of renewable energy in DC microgrids, and achieves efficient and stable control of DC bus voltage.

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Abstract

The invention discloses a DC bus voltage stabilization system and method for an AC / DC micro-grid. The method comprises the following steps: transmitting photovoltaic electric energy to a DC bus through a Boost converter of a photovoltaic power generation unit; a super capacitor energy storage branch and a storage battery energy storage branch of the hybrid energy storage unit are connected in parallel to a direct current bus through independent bidirectional Buck-Boost converters; the direct current bus electric energy is converted into alternating current electric energy through a grid-connected inverter of the alternating current inversion grid-connected unit; after the direct-current bus voltage, the voltage of each unit, the current and the energy storage charge state information are obtained through a sampling link of the special control unit, an adjusting instruction is generated through operation, the direct-current bus voltage is stably controlled, and the stability of the direct-current bus voltage is kept. Through hardware design optimization, the DC bus voltage anti-disturbance capability is significantly improved, and the service life of energy storage equipment is prolonged.
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