Method and system for suppressing active power fluctuation on ac side of power-synchronized inverter

By introducing gain into the Park converter module through virtual phase current and voltage regulation technology, the problem of active power fluctuation in grid-connected inverters under asymmetrical voltage drops is solved, achieving constant power output and improved power quality, and simplifying the control process.

CN117060441BActive Publication Date: 2026-06-26SHANGHAI JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI JIAOTONG UNIV
Filing Date
2023-08-21
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

In power systems with a high proportion of renewable energy and power electronic equipment, grid-connected inverters face AC-side active power fluctuations caused by asymmetrical voltage drops, which in turn cause DC-side voltage fluctuations and grid harmonic pollution. Existing control strategies are complex and difficult to effectively suppress power fluctuations.

Method used

By employing a combined virtual phase current regulation (VPCR) and virtual phase voltage regulation (VPVR) technology, virtual phase current and voltage gains are introduced into the Park converter module for three-phase grid-connected current and voltage. Through current compensation and modification of the power synchronization loop, the second harmonic pulsation component of active power is eliminated, thereby achieving accurate phase tracking of the grid and constant power output.

Benefits of technology

It completely eliminates AC-side active power fluctuations, ensures constant power, alleviates DC-side capacitor stress, enhances inverter fault ride-through capability, simplifies system calculations, and improves power quality and dynamic response speed.

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Abstract

The application provides a power synchronization type inverter AC side active power fluctuation suppression method and system, comprising: step S1: modeling virtual phase current regulation technology, introducing virtual phase current gain in the voltage drop phase of the Park transformation module of three-phase grid-connected current for current compensation, eliminating the two-frequency pulsation component of active power; step S2: on the basis of the model, combining the synchronous structure of the power synchronization type inverter, introducing virtual phase voltage regulation technology to modify the synchronous link, introducing virtual phase voltage gain in the voltage drop phase of the Park transformation module of three-phase voltage through the virtual phase voltage regulation technology, and using the obtained virtual d-axis voltage for reference power calculation of the power synchronization link to track the grid phase. The application completely eliminates the fluctuation of AC side active power and guarantees that the active power is a constant value, and compensates for the active power loss caused by voltage drop.
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