Method and arrangement in connection with inverter
AssigneeABB AB
InventorErkki Miettinen
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Abstract
A method and an arrangement for controlling an inverter provided with a voltage intermediate circuit, the inverter (1) comprising two or more sub-inverters (1A, 1B, 1C), each being connected with a specific cable to feed a common load (2) and each sub-inverter (1A, 1B, 1C) receiving the same switch instruction pattern. The method comprises the steps of determining the magnitude of a time delay, and consecutively generating, with each sub-inverter (1A, 1B, 1C), an output voltage according to the switch instruction for the load (2) such that each sub-inverter generates an output voltage according to the switch instruction after a time equal to the time delay.
Claims12
A method of controlling an inverter provided with a voltage intermediate circuit, the inverter comprising two or more sub-inverters, each being connected with a specific cable to feed a common load, and each sub-inverter receiving the same switching instruction pattern, the method comprising the steps of:
- determining the magnitude of a time delay;
- and
- consecutively generating, with each sub-inverter, an output voltage according to the switch instruction for the load such that each sub-inverter consecutively generates an output voltage according to the switch instruction after a time equal to the time delay.
An arrangement for controlling an inverter, the inverter comprising two or more sub-inverters, each being connected with a specific cable to feed a common load, and each sub-inverter receiving a same switch instruction, the arrangement comprising:
- means for determining or receiving the magnitude of a time delay;
- and
- means for consecutively generating an output voltage according to the switch instruction with each sub-inverter such that an output voltage according to the switch instruction is consecutively generated with each sub-inverter at intervals equal to the time delay.
Dependencies are inferred from the claim text.