Harmonic compensation method for distributed active filtering system

By establishing a Norton equivalent model and virtual impedance control in low-voltage distribution networks, the compensation current is dynamically adjusted to achieve multi-inverter collaborative allocation of harmonic compensation tasks. This solves the problems of low equipment utilization and unbalanced compensation in harmonic control in low-voltage distribution networks, and improves system stability and the effectiveness of key harmonic control.

CN121507755APending Publication Date: 2026-02-10STATE GRID GANSU ELECTRIC POWER RESEARCH INSTITUTE
0 Cites 0 Cited by

Patent Information

Application Number
CN202511668576.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-11-14
Publication Date
2026-02-10

AI Technical Summary

Technical Problem

In low-voltage distribution networks, centralized passive or active filters cannot take into account the differences in harmonic characteristics of each feeder, resulting in increased harmonic distortion at local nodes and low equipment utilization. Existing distributed active filter systems have failed to effectively solve the problems of parallel coordinated control of multiple devices and compensation task allocation under limited capacity.

Method used

By establishing a Norton equivalent model of the distribution network, calculating the harmonic responsibility coefficient of each feeder, and using virtual impedance droop control and frequency division allocation algorithm, the compensation current is dynamically adjusted to realize the autonomous and collaborative allocation of compensation tasks by multiple inverters.

Benefits of technology

Accurately locate harmonic sources, optimize the allocation of compensation resources, improve system stability and equipment utilization, and ensure effective control of critical harmonics.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention provides a harmonic compensation method for a distributed active filtering system, and relates to the technical field of power distribution networks, and the method comprises the steps: obtaining load data and distributed power data of a power distribution network, and building a power distribution network Norton equivalent model based on a Norton equivalent circuit; pCC harmonic voltage is detected, harmonic responsibility coefficients of all feeder lines are calculated in combination with a Norton equivalent model of the power distribution network, and a harmonic responsibility quantification result is obtained; obtaining harmonic compensation capacity based on the harmonic responsibility quantification result, and dynamically adjusting virtual impedance through droop control to generate basic compensation current; based on the basic compensation current, the compensation capacity of each frequency is adjusted through a frequency division distribution algorithm; a compensation task is autonomously distributed in proportion through multiple inverters according to the adjusted compensation capacity of each frequency; according to the invention, the harmonic source is accurately positioned to optimize the compensation resource allocation, and the stability of the system is significantly improved through the autonomous cooperation of multiple devices.
Need to check novelty before this filing date? Find Prior Art