US 12,756,295 B2 · Phase-loss control method for three-phase three-wire converter and three-phase AC control system

Abstract

A phase-loss control method for a three-phase three-wire converter and a three-phase AC control system are disclosed. The processor executes this method by receiving a power signal, determining if the power signal has a phase loss, and determining whether the power signal had the phase loss at the previous moment. If there was no phase loss at the previous moment, it switches from a second operating state to a first operating state, outputting a first drive signal. If there was a phase loss at the previous moment, it switches from the first operating state to the second operating state, outputting a second drive signal. By detecting phase loss, the system can immediately switch between the first and second operating states based on whether phase loss is present or not, without causing the three-phase converter to shut down. This method allows seamless state switching, improving system stability.

Claims16

Dependent claims

A control method for phase loss in a three-phase three-wire converter, the control method for phase loss in the three-phase three-wire converter being executed by a processor and comprising the following steps:

receiving a power supply signal;
determining whether the power supply signal is experiencing a phase loss;
if a phase loss is detected, determining whether the power supply signal experienced a phase loss in a previous time instance;
if no phase loss was detected in the previous time instance, switching from a second operating state to a first operating state and outputting a first drive signal;
if no phase loss is detected, determining whether the power supply signal experienced a phase loss in the previous time instance;
if a phase loss was detected in the previous time instance, switching from the first operating state to the second operating state and outputting a second drive signal.

3 more elements

A three-phase AC control system, comprising:

a three-phase converter, configured to receive a power supply signal;
and
a processor, having an input terminal and an output terminal, wherein the input terminal receives the power supply signal, and the output terminal is electrically connected to the three-phase converter, the processor being configured to determine whether the power supply signal is experiencing a phase loss;
if a phase loss is detected, the processor determines whether the power supply signal experienced a phase loss at a previous time instance;
if a phase loss is detected and no phase loss was detected at the previous time instance, the processor switches from a second operating state to a first operating state and outputs a first drive signal;
if no phase loss is detected, the processor determines whether the power supply signal experienced a phase loss at the previous time instance;
if no phase loss is detected and a phase loss was detected at the previous time instance, the processor switches from the first operating state to the second operating state and outputs a second drive signal.

4 more elements

Dependencies are inferred from the claim text.

Phase-loss control method for three-phase three-wire converter and three-phase AC control system

Life of this patent

Phase-loss control method for three-phase three-wire converter and three-phase AC control system

Life of this patent

Abstract

Claims16