Adaptive fault ride-through operation control method and device for inverter-type distributed power supply

Through the adaptive fault crossing operation control method, the inverter distributed power supply outputs the maximum allowable current in the event of a power grid failure, solving the problem of underutilizing the output capacity and improving the grid voltage support capability and fault crossing capability.

CN118336674BActive Publication Date: 2025-03-18STATE GRID HUBEI ELECTRIC POWER RES INST
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Patent Information

Application Number
CN202410169925.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-02-06
Publication Date
2025-03-18
Estimated Expiration
2044-02-06

AI Technical Summary

Technical Problem

In the prior art, the output capability of the inverter distributed power supply is not fully utilized when the power grid fails, resulting in insufficient voltage support capacity of the power grid and the fault crossing capacity needs to be improved.

Method used

An adaptive fault crossing operation control method is proposed. By calculating the boundary voltage and adaptively adjusting the distribution of active current and reactive current, the inverse distributed power supply always outputs the maximum allowable output current during fault crossing.

Benefits of technology

The maximum output current of the inverse distributed power supply during fault travel is realized, the support capacity of the grid voltage and fault travel capabilities are improved, and the protection sensitivity is enhanced.

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Abstract

The present invention provides an adaptive fault ride-through operation control method and related devices for an inverter-type distributed power supply. According to the inverter-type distributed power supply fault ride-through requirements and the grid-connected inverter current limit value, the voltage of the grid connection point when the output current of the inverter-type distributed power supply reaches the maximum allowable value, that is, the boundary voltage, is calculated, and the corresponding fault ride-through control strategy is selected according to the magnitude relationship between the grid connection point voltage and the boundary voltage. The present invention enables the inverter-type distributed power supply to always output the maximum allowable output current during the fault ride-through period, and adaptively adjusts the distribution of active current and reactive current according to the grid connection point voltage. On the one hand, it can increase the fault current output by the inverter-type distributed power supply when a minor fault occurs in the system, thereby improving the protection sensitivity; on the other hand, it can improve the ability of the inverter-type distributed power supply to output reactive power, raise the grid connection point voltage of the inverter-type distributed power supply, and enhance the fault ride-through capability of the inverter-type distributed power supply.
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