US 2015/0103574 A1 · POLY-PHASE INVERTER WITH INDEPENDENT PHASE CONTROL

Abstract

A converter system and inverter system are disclosed with individual real and reactive power control for each phase of a poly-phase system. The converter system includes a controller, bidirectional single-phase inverters with AC sides coupled to an AC line filter and DC sides connected in parallel to a link capacitor coupled to DC/DC converters. Each inverter handles a separate AC phase. The controller controls the inverters and DC/DC converters so the current amplitude of each AC phase is independent, and the phase difference of each AC phase is independent. The inverters can be galvanically isolated between the DC and AC sides. The inverters can be non-isolated inverters having line and neutral connectors coupled to an isolated transformer winding, and the output windings of the transformer can be wired in a Wye configuration. The inverters can have local controllers.

Claims20

Dependent claims

A bi-directional poly-phase DC/AC inverter comprising:

an AC side performing at least one of receiving and sourcing AC power, the AC power comprising a plurality of AC phases, each AC phase including a current waveform having a current amplitude and a current phase angle and a voltage waveform having a voltage amplitude and a voltage phase angle;
a DC side performing at least one of receiving and sourcing DC power;
wherein for each individual AC phase of the plurality of AC phases, the current amplitude of the current waveform is controlled independently of the current amplitude of the current waveform in the other AC phases, and the difference between the current and voltage phase angles is controlled independently the difference between the current and voltage phase angles in the other AC phases.

A converter system with individual real and reactive power control for each phase of a poly-phase system, the converter system coupling one or more DC loads/sources to one or more AC loads/sources using AC power having a plurality of AC phases, each AC phase including a current waveform having a current amplitude and a current phase angle and a voltage waveform having a voltage amplitude and a voltage phase angle, the converter system comprising:

a bidirectional poly-phase inverter comprised of a plurality of single-phase bidirectional inverters, each of the plurality of single-phase inverters having an AC side and a DC side, and each of the plurality of single-phase inverters handling a separate AC phase of the AC power;
an AC line filter having an AC inverter side and an AC source/load side, the AC inverter side being coupled to the AC sides of the plurality of single-phase inverters and the AC source/load side being coupled to the AC loads/sources;
a link capacitor connected in parallel with the DC sides of the plurality of single-phase inverters;
at least one bidirectional DC to DC converter connected in parallel with the link capacitor, the at least one DC to DC converter being coupled to the DC loads/sources;
a controller controlling the plurality of bidirectional single-phase inverters and the at least one bidirectional DC to DC converter;
the controller controlling the current amplitude of the current waveform of each AC phase independently of the current amplitude of the current waveform of the other AC phases, and the controller controlling the difference between the current and voltage phase angles of each AC phase independently of the difference between the current and voltage phase angles of the other AC phases.

3 more elements

Dependencies are inferred from the claim text.

Poly-phase inverter with independent phase control

Life of this patent

Poly-phase inverter with independent phase control

Life of this patent

Abstract

Claims20