Five level high power motor drive converter and control system
First Claim
1. A high power motor drive converter comprising:
- three direct current busses;
a five level hybrid neutral point clamped (NPC) output power conversion stage comprising three NPC phase bridges including switches and coupled in a wye configuration through a neutral point, the NPC output power conversion stage for supplying power to an AC drive motor, each NPC phase bridge receiving power on a respective one of the three direct current busses;
three isolated split series-connected DC capacitor banks each coupled in parallel to a respective one of the three NPC phase bridges;
a controller for selecting switch positions with active control of neutral voltages;
a rectifier transformer with three sets of three phase secondaries, each set coupled in parallel to a respective one of the capacitor banks; and
three diode rectifier source converter bridges each coupled in parallel to a respective one of the three sets of three phase secondaries.
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Accused Products
Abstract
A high power motor drive converter includes: a five level hybrid NPC output power conversion stage including three NPC phase bridges having switches and coupled in a wye configuration through a converter neutral point, each NPC phase bridge receiving power on a respective direct current bus; three isolated split series-connected DC capacitor banks each coupled in parallel to a respective one of the three NPC phase bridges; and a controller for selecting switch positions with active control of neutral voltages. The controller is adapted to select switch positions using feedforward sine-triangle modulation with third harmonic injection, zero sequence injection, and/or discontinuous modulation injection.
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Citations
25 Claims
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1. A high power motor drive converter comprising:
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three direct current busses; a five level hybrid neutral point clamped (NPC) output power conversion stage comprising three NPC phase bridges including switches and coupled in a wye configuration through a neutral point, the NPC output power conversion stage for supplying power to an AC drive motor, each NPC phase bridge receiving power on a respective one of the three direct current busses; three isolated split series-connected DC capacitor banks each coupled in parallel to a respective one of the three NPC phase bridges; a controller for selecting switch positions with active control of neutral voltages; a rectifier transformer with three sets of three phase secondaries, each set coupled in parallel to a respective one of the capacitor banks; and three diode rectifier source converter bridges each coupled in parallel to a respective one of the three sets of three phase secondaries. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of controlling a high power motor drive converter including three direct current busses, a five level hybrid neutral point clamped (NPC) output power conversion stage comprising three NPC phase bridges including switches and coupled in a wye configuration through a neutral point, each NPC phase bridge receiving power on a respective one of the three direct current busses, and three isolated split series-connected DC capacitor banks each coupled in parallel to a respective one of the three NPC phase bridges, the method comprising:
selecting switch positions with active control of neutral voltages by using space vector modulation to control a magnitude and a rotation of a reference voltage vector in a complex voltage plane.
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18. A method of controlling a high power motor drive converter including three direct current busses, a five level hybrid neutral point clamped (NPC) output power conversion stage comprising three NPC phase bridges including switches and coupled in a wye configuration through a neutral point, each NPC phase bridge receiving power on a respective one of the three direct current busses, and three isolated split series-connected DC capacitor banks each coupled in parallel to a respective one of the three NPC phase bridges, the method comprising:
selecting switch positions with active control of neutral voltages by using feedforward sine-triangle modulation with third harmonic injection applied to each of the three NPC phase bridges. - View Dependent Claims (19)
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20. A method of controlling a high power motor drive converter including three direct current busses, a five level hybrid neutral point clamped (NPC) output power conversion stage comprising three NPC phase bridges including switches and coupled in a wye configuration through a neutral point, each NPC phase bridge receiving power on a respective one of the three direct current busses, and three isolated split series-connected DC capacitor banks each coupled in parallel to a respective one of the three NPC phase bridges, the method comprising:
selecting switch positions that apply a space vector equivalent triplen harmonic waveform injection to each of the three NPC phase bridges to provide active control of neutral voltages. - View Dependent Claims (21, 22)
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23. A method of controlling a high power motor drive converter including three direct current busses, a five level hybrid neutral point clamped (NPC) output poser conversion stage comprising three NPC phase bridges including switches and coupled in a wye configuration through a neutral point, each NPC phase bridge receiving power on a respective one of the three direct current busses, and three isolated split series-connected DC capacitor banks each coupled in parallel to a respective one of the three NPC phase bridges, the method comprising:
selecting switch positions with active control of neutral voltages by using feedforward sine-triangle modulatin with zero sequence injection applied to each of the three NPC phase bridges.
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24. A method of controlling a high power motor drive converter including three direct current busses, a five level hybrid neutral point clamped (NPC) output power conversion stage comprising three NPC phase bridges including switches and coupled in a wye configuration thourgh a neutral point, each NPC phase bridge receiving power on a respective one of the three direct current busses, and three isolated split series-connected DC capacitor banks each coupled in parallel to a respective one of the three NPC phase bridges, the method comprising:
selecting switch positions with active control of neutral voltages by using feedforward sine-triangle modulation with discontinuous modulation injection. - View Dependent Claims (25)
Specification