Parallel control method and device for sodium salt energy storage system pcs

By employing communication interaction circuits, droop control circuits, and sodium salt battery adapter circuits in the sodium salt energy storage system, the circulating current and current sharing problems in PCS parallel control are solved, achieving high-precision, dynamic response control of the sodium salt energy storage system, and supporting modular expansion and non-stop maintenance.

CN122178579APending Publication Date: 2026-06-09INNER MONGOLIA JIANHENG AONENG TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
INNER MONGOLIA JIANHENG AONENG TECH CO LTD
Filing Date
2026-05-07
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

In existing sodium salt energy storage systems, the parallel control of multiple PCS units suffers from problems such as large circulating current, poor current sharing accuracy, slow dynamic response, high hardware cost, weak anti-interference capability, and insufficient modular management, which cannot fully realize the performance advantages of sodium salt batteries.

Method used

It adopts a communication interaction circuit to synchronize the voltage and frequency reference values ​​with the low-speed communication bus, and superimposes virtual impedance compensation through a droop control circuit. Combined with a current sharing adjustment circuit and a sodium salt battery adapter circuit, it achieves high-precision current sharing and dynamic response. It degrades operation when low-speed communication is interrupted and supports hot-swapping of modules and redundancy management.

Benefits of technology

It achieves circulating current suppression to within 1% of rated current, current sharing accuracy of ±2%, dynamic response of <200ms, supports "plug and play" modules and non-stop maintenance, and improves system reliability and availability.

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Abstract

This invention discloses a parallel control method and apparatus for a sodium salt energy storage system (PCS), applicable to a sodium salt energy storage system comprising at least two PCSs. The control method includes: connecting to a low-speed communication bus via a communication interaction circuit to synchronize the voltage frequency reference values ​​of each PCS and obtain the system average current; generating an initial voltage reference command based on the local output current and output voltage via a droop control circuit, and superimposing a virtual impedance compensation amount generated based on the output current into the droop control equation; fine-tuning the initial voltage reference command based on the deviation between the local output current and the system average current via a current sharing adjustment circuit to generate a final voltage reference command; and communicating with a sodium salt battery management system via a sodium salt battery adapter circuit to adjust the droop control coefficient based on the received sodium salt battery state parameters.
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