Discontinuous pulse width drive modulation method and apparatus for reduction of common-mode voltage in power conversion systems
First Claim
Patent Images
1. A power conversion system comprising:
- a DC circuit configured to transmit DC power;
an inverter coupled to the DC circuit and configured to receive the DC power, the inverter comprising one or more AC terminals for supplying AC power and an inverter switching network comprising a plurality of inverter switches for converting the DC power to the AC power; and
a switch controller, wherein the switch controller uses a first single carrier wave to control the inverter switching network for supplying the AC power, and wherein the switch controller applies control signals to the inverter switching network in accordance with a selected switching sequence corresponding to a desired sector of a switching scheme in which a reference vector is currently located, the switching scheme corresponding to the reference vector in a space vector modulation scheme having six stationary active space vectors around the periphery and two stationary zero vectors at an origin, the scheme having six triangular sectors positioned around the origin, each sector defined by a 60°
angle having two edges sharing a common origin endpoint and bifurcating triangular segments corresponding to the six active space vectors.
1 Assignment
0 Petitions
Accused Products
Abstract
Control systems, methods and power conversion systems are presented for reducing common mode voltages in AC motor loads driven by inverter PWM control using switching sequences with only active vectors where a first vector of each switching sequence differs by one phase switching state from a last vector of a switching sequence of an adjacent sector, along with enhanced deadtime compensation and reflected wave reduction techniques in providing pulse width modulated switching signals to a switching inverter.
30 Citations
19 Claims
-
1. A power conversion system comprising:
-
a DC circuit configured to transmit DC power; an inverter coupled to the DC circuit and configured to receive the DC power, the inverter comprising one or more AC terminals for supplying AC power and an inverter switching network comprising a plurality of inverter switches for converting the DC power to the AC power; and a switch controller, wherein the switch controller uses a first single carrier wave to control the inverter switching network for supplying the AC power, and wherein the switch controller applies control signals to the inverter switching network in accordance with a selected switching sequence corresponding to a desired sector of a switching scheme in which a reference vector is currently located, the switching scheme corresponding to the reference vector in a space vector modulation scheme having six stationary active space vectors around the periphery and two stationary zero vectors at an origin, the scheme having six triangular sectors positioned around the origin, each sector defined by a 60°
angle having two edges sharing a common origin endpoint and bifurcating triangular segments corresponding to the six active space vectors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A power conversion system comprising:
-
a rectifier comprising a rectifier switching network having a plurality of rectifier switches configured to receive AC input power and to convert the AC input power to DC power applied to a DC bus; an inverter configured to receive the DC power from the DC bus, the inverter comprising an inverter switching network having a plurality of inverter switches configured to receive the DC power and to convert the DC power to output AC power; and a switch controller configured to control the rectifier switching network for conversion of the AC input power to the DC power based upon a first single triangle carrier wave, and to control the inverter switching network for conversion of the DC power to the output AC power based upon a second single triangle carrier wave, wherein the switch controller applies control signals to the inverter switching network or to the rectifier switching network in accordance with a selected switching sequence corresponding to a desired sector of a switching scheme in which a first reference vector is currently located, the switching scheme corresponding to the first reference vector in a space vector modulation scheme having six stationary active space vectors around the periphery and two stationary zero vectors at an origin, the scheme having six triangular sectors positioned around the origin, each sector defined by a 60°
angle having two edges sharing a common origin endpoint and bifurcating triangular segments corresponding to the six active space vectors. - View Dependent Claims (13, 14, 15, 16)
-
-
17. A non-transitory computer-readable medium comprising code adapted to:
-
calculate a PWM period TPWM; receive a signal representative of one or more AC output phases of an inverter, of a rectifier, or a combination thereof; calculate a sector position of a reference vector in accordance with a space vector switching scheme having six sectors, wherein the space vector switching scheme comprises six stationary active space vectors around the periphery and two stationary zero vectors at an origin, the six sectors positioned around the origin, each sector defined by a 60°
angle having two edges sharing a common origin endpoint and bifurcating triangular segments corresponding to the six active space vectors;derive a PWM switching sequence based on the position of the reference vector; derive a max, a mid, or a min value based on the received signal; apply an active high modulation to the max and min values; apply an active low modulation to the mid value; generate the PWM switching sequence by using a single carrier wave and the applied active high modulation and active low modulation; and apply the PWM switching sequence to a switching network. - View Dependent Claims (18, 19)
-
Specification