Method for converting direct voltage into three-phase alternating voltage
First Claim
1. A method of converting direct voltage generated by a mains connected system for decentralized power supply into a three-phase alternating voltage by means of a plurality of single-phase inverters (WR1-WR3) connected to a different phase (L1, L2, L3), said alternating voltage being provided for supplying an electric mains and for decentralized power supply, whereby upon failure of one inverter (WR1-WR3), an asymmetrical power supply distribution is reduced by limiting the output of the other inverters, whereby the failure of the inverter (WR1-WR3) is registered by a measurement signal of an additional circuit of the inverter, a communication signal resulting from the measurement signal being provided for limiting the output or for disconnecting the inverters from the mains,whereby the measurement signal is generated by a current of a constant current source, said current of said constant current source being in the milliampere range.
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Abstract
A method of converting a direct voltage generated by a decentralized power supply system into three-phase alternating voltage by means of a plurality of single-phase inverters (WR1-WR3), said alternating voltage being provided for supplying an electric mains, is intended to avoid inadmissible load unbalances using single-phase inverters. This is achieved in that, upon failure of one inverter (WR1-WR3), an asymmetrical power supply distribution is reduced by limiting the output of the other inverters. The method makes it possible to simplify three-phase voltage monitoring.
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Citations
13 Claims
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1. A method of converting direct voltage generated by a mains connected system for decentralized power supply into a three-phase alternating voltage by means of a plurality of single-phase inverters (WR1-WR3) connected to a different phase (L1, L2, L3), said alternating voltage being provided for supplying an electric mains and for decentralized power supply, whereby upon failure of one inverter (WR1-WR3), an asymmetrical power supply distribution is reduced by limiting the output of the other inverters, whereby the failure of the inverter (WR1-WR3) is registered by a measurement signal of an additional circuit of the inverter, a communication signal resulting from the measurement signal being provided for limiting the output or for disconnecting the inverters from the mains,
whereby the measurement signal is generated by a current of a constant current source, said current of said constant current source being in the milliampere range.
Specification