Method and device for suppressing specific grid-connected current harmonic waves of energy storage converter
By combining a multi-synchronous rotating coordinate system and a PI regulator, the suppression of specific harmonic currents in the energy storage converter is achieved, solving the problem of grid-connected current harmonics in the energy storage converter and improving the quality of power transmission and the stability of the equipment.
CN121307940AInactive Publication Date: 2026-01-09STATE GRID JIANGSU ELECTRIC POWER CO LTD RESEARCH INSTITUTE +1
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Patent Information
- Application Number
- CN202511864552.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-11
- Publication Date
- 2026-01-09
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Technical Problem
Energy storage converters suffer from current harmonics during grid connection, leading to increased power loss, accelerated equipment aging, and safety hazards, which are difficult to effectively suppress with existing technologies.
Method used
A harmonic current extraction method using multiple synchronous rotating coordinate systems is adopted. Combined with a PI regulator, the modulation wave is injected through a low-pass filter and harmonic voltage compensation to suppress specific harmonic currents.
Benefits of technology
It effectively suppresses grid-connected current harmonics of energy storage converters, improves grid-side current quality, reduces total harmonic distortion, and enhances power transmission efficiency and equipment stability.
✦ Generated by Eureka AI based on patent content.
Abstract
The invention discloses a specific grid-connected current harmonic suppression method and device for an energy storage converter, and belongs to the technical field of power systems, and the method comprises the steps: obtaining a given current value of a fundamental current loop, and carrying out the dq / abc conversion to obtain a three-phase current reference value; acquiring a three-phase current value of a power grid side, and subtracting the three-phase current value from the three-phase current reference value to obtain a harmonic current value; converting the harmonic current value to a target subharmonic synchronous rotating coordinate system to obtain a target subharmonic current value; extracting the target sub-harmonic current value in a direct current form through a low-pass filter, and sending the target sub-harmonic current value to a PI regulator for regulation to obtain a harmonic voltage compensation amount; and injecting the harmonic voltage compensation amount into a modulation wave to realize suppression of the target subharmonic current. According to the invention, the grid-connected side current harmonic of the energy storage converter can be effectively suppressed, and the grid-side current quality is improved.
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