An output current limiting control method of an inverter distributed power supply

Abstract

The invention discloses an output current-limiting control method for an inversion type distributed power supply. The maximum of output active power of the inversion type distributed power supply under symmetrical faults and under unsymmetrical faults can be ensured; meanwhile, the positive sequence voltage amplitude value output by the inversion type distributed power supply is improved, the negative sequence voltage amplitude value is reduced, and the degree of asymmetry of output voltage of the inversion type distributed power supply is reduced; specific to different current-limiting methods, a relatively high voltage output level of the inversion type distributed power supply is ensured under unsymmetrical faults, so that a low voltage protection action is not triggered easily; specific to the negative sequence overcurrent protection, the negative sequence current output is limited by the current-limiting method provided by the invention, so that the negative sequence overcurrent protection is relatively not triggered easily; and compared with a non-current-limiting control method and other two current-limiting control methods, the output current-limiting control method provided by the invention can both better ensure the stable operation of the inversion type distributed power supply without logging out under symmetrical faults and under unsymmetrical faults, so that the system stability is improved.

Description

technical field [0001] The invention belongs to the technical field of controller parameter optimization design, and in particular relates to an output current limiting control method of an inverter type distributed power supply. Background technique [0002] In order to ensure the normal operation of the inverter distributed power electronic devices, the output current of the inverter distributed power supply must be limited within a certain range, usually twice the rated current of the power electronic devices. When the fault voltage drop depth is large, the output current of the inverter distributed power supply can easily reach the current limit value. Therefore, the current-limiting operation mode is one of the common operation modes under the fault condition of the inverter distributed power supply. The research on the current limiting measures of the inverter distributed power supply and the fault characteristics under the specific current limiting method is of great ...

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to provide an output current limiting control method of an inverter distributed power supply, which solves the problem of increased voltage asymmetry existing in the prior art when an inverter distributed power supply is outputting a current limit

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