Operating method for an inverter and grid fault tolerant inverter
AssigneeSMA Solar Technology AG
InventorsPablo Correa Vasquez, TOBIAS MUELLER, HENRIK WOLF
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Abstract
The disclosure relates to a method for operating an inverter that includes at least one bridge assembly that is actuated in a modulated manner for supplying electrical power to an energy supply network. Initially, the inverter is operated by the unipolar actuation of the at least one bridge assembly and the energy supply network is monitored for the presence of a network fault. If a network fault is detected, the inverter is operated at least at intervals by the bipolar actuation of the at least one bridge assembly. The disclosure further relates to a network fault-tolerant inverter which is equipped for carrying out the method.
Claims19
A method for operating an inverter having at least one bridge arrangement that is actuated in a modulated manner for feeding electrical power into a power supply grid, comprising:
- operating the inverter by unipolar actuation of the at least one bridge arrangement;
- monitoring the power supply grid for the presence of a grid fault;
- and
- at least temporarily operating the inverter by bipolar actuation of the at least one bridge arrangement if a grid fault is detected.
A grid fault tolerant inverter for feeding electrical power into a power supply grid, comprising:
- at least one bridge arrangement with bridge switches;
- a pulse-width modulation circuit configured to selectively actuate the at least one bridge arrangement in one of a unipolar or bipolar fashion;
- and
- a monitoring device configured to detect grid faults,
- wherein the pulse-width modulation circuit is configured to operate the at least one bridge arrangement at least temporarily by bipolar actuation in case a grid fault is detected, and to operate the at least one bridge arrangement by unipolar actuation in case no grid fault is detected.
An inverter, comprising:
- a bridge arrangement configured to operate in a unipolar drive mode or a bipolar drive mode;
- a grid monitor circuit configured to evaluate a status of a power supply grid at an output of the bridge arrangement and output an evaluation signal based thereon;
- and
- a pulse-width modulation circuit configured to generate mode control signals to the bridge arrangement to dictate one of the unipolar drive mode or the bipolar drive mode based on the evaluation signal.
Dependencies are inferred from the claim text.