A method and system for determining the voltage of a three-phase four-wire distribution substation.

Abstract

This invention discloses a method and system for determining the voltage of a three-phase four-wire distribution transformer substation, relating to the field of voltage quality analysis technology. The method involves obtaining the line impedance matrix and apparent power of multiple nodes in the three-phase four-wire distribution transformer substation. Based on the apparent power and multiple preset initial voltages, sequence current forwarding is performed to obtain multiple branch sequence component currents. Similarly, based on the line impedance matrix and the sequence component currents of each branch, sequence voltage forwarding is performed to obtain multiple node sequence component voltages. Finally, the sequence component voltages of each node are iteratively solved based on the preset initial voltages to obtain the target node voltage for each node. This method overcomes the technical problem that traditional three-phase four-wire distribution transformer substation voltage calculation methods, which are mostly based on the Newton-Raphson method, fail to fully utilize the topological characteristics of the three-phase four-wire system to achieve efficient decoupling calculations. This results in insufficient efficiency and accuracy in voltage determination under unbalanced operating conditions, reducing the reliability of power system operation.

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