A power distribution network voltage out-of-limit management device and a control method thereof

By employing a three-set switch pair and transformer AC/AC voltage regulation topology in the distribution network, combined with switching combination and PI regulation, the problems of complex structure, high cost and poor short-circuit resistance in the existing technology are solved, realizing flexible voltage regulation and precise voltage control to meet the needs of different voltage scenarios.

CN121791206BActive Publication Date: 2026-07-03STATE GRID SHANGHAI ENERGY INTERCONNECTION RES INST CO LTD
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Patent Information

Application Number
CN202610255432.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-03-04
Publication Date
2026-07-03
Estimated Expiration
2046-03-04

AI Technical Summary

Technical Problem

Existing voltage regulation devices for power distribution networks are complex in structure and expensive, making it difficult to achieve flexible voltage increases and decreases. They also have poor short-circuit resistance and cannot effectively solve the problem of line voltage exceeding limits.

Method used

The AC/AC voltage regulation topology of three sets of switch pairs and transformers, combined with switching combinations, enables flexible adjustment of the load-side voltage, and precise adjustment of the load-side voltage is achieved by controlling the duty cycle of the switches through PI regulation.

Benefits of technology

It enables flexible voltage ramping in power distribution networks, simplifies device structure and control, reduces costs, enhances short-circuit withstand capability, improves voltage regulation accuracy and response speed, and adapts to the needs of different voltage scenarios.

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Abstract

This invention relates to a voltage over-limit mitigation device and control method for power distribution networks. The device includes a voltage regulator and a transformer. The voltage regulator comprises three sets of switch pairs, two inductors, and two capacitors. Its input side is connected in parallel to the power supply side of the power distribution network, and its output side is connected in series to the load side via the transformer. When the device is activated, the output voltage of the AC / AC voltage regulator is calculated based on the current load voltage, the ideal load voltage, and the transformer turns ratio. The operating mode and switching control method of the AC / AC voltage regulator are determined based on the output voltage, thereby adjusting the load voltage to mitigate voltage over-limits. This invention enables flexible voltage increase and decrease regulation in power distribution networks, has strong short-circuit withstand capability, and features a simple structure, control system, and low cost.
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