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Distributed Battery-Oriented Active Power Dispatch for Parallel-Connected Household Energy Storage Inverters Using Virtual Common DC Bus Regulation
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DOI：10.1109/tpel.2026.3697768.png)
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Abstract
En 中文
Parallel operation of multiple household energy storage inverters (HESIs) enables flexible system capacity expansion. However, the absence of a DC point of common coupling (PCC) poses prominent challenges in real-time active power allocation, state-of-charge (SOC) balancing, and communication coordination. This article establishes the system’s impedance model under DC bus signal control, analyzes its decoupling mechanism in a single-unit system and AC–DC coupling characteristics in parallel configurations. To address these issues, a virtual common DC bus balancing control strategy is proposed. By constructing virtual interconnections among all units’ DC buses and a virtual DC PCC, AC–DC decoupling of the parallel HESIs system is achieved. Each unit autonomously adjusts output power per unified benchmarks and realizes dynamic inter-unit compensation based on its own characteristics, achieving autonomous active power dispatch with sparse communication. Further, a SOC balancing strategy for distributed energy storage is developed using the virtual DC PCC. The proposed scheme maintains low inter-unit coupling, enhances system efficiency and economy, and reduces control complexity. Simulation and experimental results validate the feasibility and effectiveness of the presented method.
Keywords:
Household energy storage inverters (HESIs)
parallel connected
power control
virtual common DC bus balancing
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6.5
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1.7W
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8.3W
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