Output impedance modeling method and device of three-phase three-leg inverter, electronic equipment and storage medium

By determining the current limiting strategy in a three-phase and three-bridge arm inverter, analyzing and constructing the zero-sequence, positive-sequence and negative-sequence output impedance models, the problem of lack of practical grid-connected inverter models in the existing technology is solved, and detailed analysis of the inverter impedance characteristics and improvement of system stability is achieved.

CN119675103AActive Publication Date: 2025-03-21GUANGDONG POWER GRID CO LTD +1
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Patent Information

Application Number
CN202411747177.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-02
Publication Date
2025-03-21
Estimated Expiration
2044-12-02

AI Technical Summary

Technical Problem

There is currently no practical model to describe the characteristics of grid-connected inverters, especially in terms of the output impedance of three-phase and three-bridge arm inverters.

Method used

By determining the current limiting strategy of the grid-connected inverter, the zero-sequence, positive-sequence and negative-sequence output impedances of the three-phase and three-bridge arm inverter were analyzed, and the corresponding model was constructed. Current limiting strategies include instantaneous saturation current limiting strategies or latched current limiting strategies.

Benefits of technology

A zero-sequence, positive-sequence and negative-sequence output impedance model of grid-connected inverter for three-phase and three-bridge arm inverter is constructed, which can analyze the impedance characteristics of the inverter under different frequency components, and improve the stability of the system, fault identification and grid-connection control capabilities.

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Abstract

The invention discloses an output impedance modeling method, device and equipment of a three-phase three-bridge-arm inverter and a storage medium, and the method comprises the steps: analyzing the zero-sequence output impedance of the three-phase three-bridge-arm inverter according to a current limiting strategy of a grid-connected inverter, and constructing a grid-connected inverter zero-sequence output impedance model of the three-phase three-bridge-arm inverter; calculating the positive sequence output impedance of the three-phase three-leg inverter according to the steady-state output voltage positive sequence phasor and the steady-state output current positive sequence phasor after the phase-to-phase symmetric fault occurs, and constructing a grid-connected inverter positive sequence output impedance model of the three-phase three-leg inverter; and calculating the negative sequence output impedance of the three-phase three-leg inverter according to the steady-state output voltage negative sequence phasor and the steady-state output current negative sequence phasor after the occurrence of the inter-phase asymmetric fault, constructing a grid-connected inverter negative sequence output impedance model of the three-phase three-leg inverter, and obtaining an output impedance model of the three-phase three-leg inverter. According to the invention, the output impedance model of the three-phase three-leg inverter can be constructed.
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