Control method, apparatus and circuit for current source converter, device, and medium

By detecting DC voltage and controlling the opening and switching of controllable switching devices, the voltage stability problem of current source converters under light load and load change is solved, thus improving the safety and stability of the load.

WO2026137888A1PCT designated stage Publication Date: 2026-07-02GD MIDEA AIR CONDITIONING EQUIP CO LTD +1
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
GD MIDEA AIR CONDITIONING EQUIP CO LTD
Filing Date
2025-08-12
Publication Date
2026-07-02

AI Technical Summary

Technical Problem

Current source converters may cause excessive power accumulation on the DC side when supplying power under light loads, triggering DC overvoltage protection or threatening load safety. Furthermore, sudden increases or decreases in DC voltage when the load demand power changes may affect the normal operation of the load.

Method used

By detecting the DC voltage, the controllable switching device is controlled to disconnect the bus capacitor charging circuit, and the control algorithm is switched when the DC voltage exceeds or falls below the threshold. Dual-loop or single-loop control algorithms are used to stabilize the voltage, including voltage and current dual-loop control, voltage single-loop control, proportional-integral control, etc.

Benefits of technology

It reduces DC overvoltage protection events and load safety threats, improves the stability and safety of load operation, and reduces the impact of voltage fluctuations on the load.

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Abstract

The present disclosure relates to the technical field of converters, and provides a control method, apparatus and circuit for a current source converter, a device, and a medium. The method comprises: measuring a direct current voltage outputted by a current source converter; when the direct current voltage is greater than a direct current upper limit threshold, controlling a plurality of controllable switching devices in the current source converter to be switched off, so as to disconnect a charging circuit of a direct current bus capacitor in the current source converter; and when the direct current voltage is less than a first direct current lower limit threshold, determining a drive control signal, and controlling the plurality of controllable switching devices in the current source converter on the basis of the drive control signal. In the present disclosure, charging of the bus capacitor is stopped by controlling the plurality of controllable switching devices to be switched off, and in this process, the bus capacitor keeps supplying power to a load, so that the direct current voltage is reduced, thereby reducing the possibility of direct current overvoltage protection events and load safety threatening events, and improving the stability and safety of load operation.
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