Three-phase inverter arrangement
First Claim
1. An inverter arrangement for generating a three-phase AC output voltage of the type having three single-phase inverters, each single-phase inverter being connected at an input to a DC voltage source, and at an output to a transformer arrangement by at least one low-pass filter, the arrangement further comprising:
- first, second, and third single-phase transformers in the transformer arrangement, each of said single-phase transformers having a converter-side winding connected to the low-pass filter, and a network-side winding, said network-side windings of said first, second, and third single-phase transformers being connected to one another in a Y-circuit configuration having a neutral terminal, said neutral terminal being connected to a reference potential;
first, second, and third phase control means for controlling respective ones of the single-phase inverters, each of said first, second, and third phase control means having a vector-oriented control device coupled to an associated pulse control unit, said pulse control unit having at least one output for providing control pulses;
vector oscillator means for generating a plurality of reference signals corresponding to a symmetrical three-phase system of reference vectors; and
first and second input means in each of said vector-oriented control devices, said first input means being adapted to receive a corresponding one of said reference signals of said vector oscillator means, and said second input means being adapted for receiving a measurement signal corresponding in phase to a predetermined one of the three-phase AC output voltages.
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Accused Products
Abstract
An inverter arrangement for generating a three-phase AC output voltage is provided with three pulse-controlled, free-running single-phase inverters. The inverters are connected at their inputs to a DC voltage source, and at their outputs to respective low-pass filters. The low-pass filters are connected to corresponding single-phase transformers, each having an output winding. The output windings of the single-phase transformers are connected to one another in a Y-circuit configuration to produce the output AC voltages, having a grounded neutral terminal. Each of the single-phase inverters is controlled by an associated pulse control device which contains a vector-oriented control device and a control unit. A vector oscillator generates signals corresponding to a symmetrical three-phase system of reference vectors for the vector-oriented control devices.
89 Citations
4 Claims
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1. An inverter arrangement for generating a three-phase AC output voltage of the type having three single-phase inverters, each single-phase inverter being connected at an input to a DC voltage source, and at an output to a transformer arrangement by at least one low-pass filter, the arrangement further comprising:
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first, second, and third single-phase transformers in the transformer arrangement, each of said single-phase transformers having a converter-side winding connected to the low-pass filter, and a network-side winding, said network-side windings of said first, second, and third single-phase transformers being connected to one another in a Y-circuit configuration having a neutral terminal, said neutral terminal being connected to a reference potential; first, second, and third phase control means for controlling respective ones of the single-phase inverters, each of said first, second, and third phase control means having a vector-oriented control device coupled to an associated pulse control unit, said pulse control unit having at least one output for providing control pulses; vector oscillator means for generating a plurality of reference signals corresponding to a symmetrical three-phase system of reference vectors; and first and second input means in each of said vector-oriented control devices, said first input means being adapted to receive a corresponding one of said reference signals of said vector oscillator means, and said second input means being adapted for receiving a measurement signal corresponding in phase to a predetermined one of the three-phase AC output voltages. - View Dependent Claims (2, 3)
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4. An inverter arrangement for generating a three-phase AC output voltage of the type having first, second and third single-phase inverters, each single-phase inverter being connected at an input to a DC voltage source, and at an output to a transformer arrangement, the arrangement further comprising:
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first, second, and third single-phase transformers in the transformer arrangement, and first, second and third low-pass filters, corresponding to the single-phase inverters, each of said single-phase transformers having a converter-side winding connected to the output of the corresponding single-phase inverter, and a network-side winding, said network-side windings of said first, second, and third single-phase transformers being connected to one another in a Y-circuit configuration having a neutral terminal, said neutral terminal being connected to a reference potential; and
said first, second and third low-pass filters being arranged on the converter-side winding of said corresponding transformers;first, second, and third phase control means for controlling respective ones of the single-phase inverters, each of said first, second, and third phase control means having a vector-oriented control device coupled to an associated pulse control unit, said pulse control unit having at least one output for providing control pulses; vector oscillator means for generating a plurality of reference signals corresponding to a symmetrical three-phase system of reference vectors; and first and second input means in each of said vector-oriented control devices, said first input means being adapted to receive a corresponding one of said reference signals of said vector oscillator means, and said second input means being adapted for receiving a measurement signal corresponding in phase to a pre-determined one of the three-phase AC output voltages.
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Specification