Synchronization of parallel-connected inverter units or frequency converters
First Claim
1. A method for synchronizing parallel-connected inverter units (INU1, INU2), said inverters comprising inverter-specific modulators, characterized in that, in the method, the circulating current between the inverter units is measured, and the modulators are synchronized to each other on the basis of the current measurement data.
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Abstract
A method for the synchronization of parallel-connected inverter units (INU1, INU2) or frequency converters and an inverter apparatus or a frequency converter apparatus wherein the inverter units are provided with inverter-specific modulators, in which method the circulating current between the inverter units is measured, and the modulators are synchronized to each other on the basis of the current measurement data.
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Citations
20 Claims
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1. A method for synchronizing parallel-connected inverter units (INU1, INU2), said inverters comprising inverter-specific modulators, characterized in that, in the method,
the circulating current between the inverter units is measured, and the modulators are synchronized to each other on the basis of the current measurement data.
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7. An inverter apparatus comprising parallel-connected inverter units (INU1, INU2), which inverter units are provided with inverter-specific modulators, characterized in that the apparatus:
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measures the circulating current between the inverter units, and synchronizes the modulators to each other on the basis of the current measurement data. - View Dependent Claims (8, 9, 10)
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11. A method for synchronizing parallel-connected frequency converters (FC1, FC2) re-injecting braking energy into the supply network, said frequency converters having inverter unit-specific modulators both in the mains bridges and in the load bridges, characterized in that, in the method:
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the circulating current between the frequency converters is measured, and the mains bridge modulators are synchronized to each other and the load bridge modulators are synchronized to each other on the basis of the current measurement data. - View Dependent Claims (12, 13, 14, 15, 16)
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17. An apparatus consisting of frequency converters (FC1, FC2) re-injecting braking energy into the supply network, which frequency converters are provided with inverter unit-specific modulators both in the mains bridges and in the load bridges, characterized in that the apparatus:
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measures the circulating current between the inverter units, and synchronizes the modulators to each other on the basis of the current measurement data. - View Dependent Claims (18, 19, 20)
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Specification