US 7,009,856 B2Granted

Vector-controlled dual inverter system and method for induction motor

AssigneeHyundai Motor Company

InventorsSang Hyun Moon, Kwang Hee Nam, Jun Ha Kim

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Abstract

A vector-controlled, dual inverter system for a three-phase induction motor is disclosed. The inverter system comprises a first inverter system which is connected to one end of three phase windings of a stator and performs compensation of a back electromotive force; and a second inverter system which is connected to the other end of the three windings of the stator and performs reactive power compensation.

Claims3

Dependent claims

A vector-controlled, dual inverter system for a three-phase induction motor, comprising:

a first inverter system adapted to be coupled to one end of three-phase windings of a stator and configured to compensate back electromotive force, in which the first inverter system interconnects a battery and a three-phase induction motor, and the second inverter system interconnects a capacitor and the three-phase induction motor;
and
a second inverter system adapted to be coupled to the other end of the three-phase windings of the stator and configured to compensate reactive power,
wherein the first inverter system comprises:
a q-axis current controller configured to provide proportional integral control based on a difference between a q-axis current command and a q-axis current, compensating back EMF, and generating a first q-axis voltage command;
a magnetic flux controller configured to provide proportional integral control based on a difference between a magnetic flux command and magnetic flux, and generating a d-axis current command;
a d-axis current controller configured to provide proportional integral control based on the difference between the d-axis current command and the d-axis current, and generating a first-d axis voltage command;
a first d-q/three-phase coordinate converter adapted to receive the first q-axis voltage command and the first d-axis voltage command, and configured to convert the first q-axis voltage command and the first d-axis voltage command to a first three-phase voltage command;
a first inverter configured to convert Direct Current (D.C.) power to Alternating Current (A.C.) power based on the first three-phase voltage command to the three-phase induction motor;
and
a first three-phase/d-q coordinate converter configured to detect the three-phase currents flowing from the first inverter to the three-phase induction motor and converting the three-phase currents to a q-axis current and a d-axis current,
wherein the second inverter system comprises:
a voltage controller configured to provide proportional integral control based on a difference between a DC-link capacitor voltage command and a DC-link capacitor voltage to estimate a voltage command vector and dividing the voltage command vector into a d-axis component and a q-axis component;
a reactive voltage compensator compensating a d-axis component and a q-axis component and providing a second d-axis voltage command and a second q-axis voltage command;
a second d-q/three-phase coordinate converter receiving the second q- axis voltage command and the second d-axis voltage command and converting them to a second three-phase voltage command;
and
a second inverter converting D.C. power to A.C. power based on the second three-phase voltage command to the three-phase induction motor.

14 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/750,692Filed 31 Dec 2003
Priority: KR 10-2003-00452154 Jul 2003
Published: US 2005/0002210 A16 Jan 2005
Granted: 7 Mar 2006
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

H02M 7/5387
Using semiconductor devices only, e.g. single switched pulse inverters: in a bridge configuration
B60L 15/025
Characterised by the form of the current used in the control circuit: using field orientation; Vector control; Direct Torque Control [DTC]
B60L 50/16
Using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines: with provision for separate direct…
B60L 2220/12
Electrical machine types: induction machines

Family

US 2005/0002210 A1Pre-grant publication · published 6 Jan 2005
US 7,009,856 B2This patent

From the US filing history. Foreign family members aren’t listed.

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Abstract

A vector-controlled, dual inverter system for a three-phase induction motor, comprising:

a first inverter system adapted to be coupled to one end of three-phase windings of a stator and configured to compensate back electromotive force, in which the first inverter system interconnects a battery and a three-phase induction motor, and the second inverter system interconnects a capacitor and the three-phase induction motor;
and
a second inverter system adapted to be coupled to the other end of the three-phase windings of the stator and configured to compensate reactive power,
wherein the first inverter system comprises:
a q-axis current controller configured to provide proportional integral control based on a difference between a q-axis current command and a q-axis current, compensating back EMF, and generating a first q-axis voltage command;
a magnetic flux controller configured to provide proportional integral control based on a difference between a magnetic flux command and magnetic flux, and generating a d-axis current command;
a d-axis current controller configured to provide proportional integral control based on the difference between the d-axis current command and the d-axis current, and generating a first-d axis voltage command;
a first d-q/three-phase coordinate converter adapted to receive the first q-axis voltage command and the first d-axis voltage command, and configured to convert the first q-axis voltage command and the first d-axis voltage command to a first three-phase voltage command;
a first inverter configured to convert Direct Current (D.C.) power to Alternating Current (A.C.) power based on the first three-phase voltage command to the three-phase induction motor;
and
a first three-phase/d-q coordinate converter configured to detect the three-phase currents flowing from the first inverter to the three-phase induction motor and converting the three-phase currents to a q-axis current and a d-axis current,
wherein the second inverter system comprises:
a voltage controller configured to provide proportional integral control based on a difference between a DC-link capacitor voltage command and a DC-link capacitor voltage to estimate a voltage command vector and dividing the voltage command vector into a d-axis component and a q-axis component;
a reactive voltage compensator compensating a d-axis component and a q-axis component and providing a second d-axis voltage command and a second q-axis voltage command;
a second d-q/three-phase coordinate converter receiving the second q- axis voltage command and the second d-axis voltage command and converting them to a second three-phase voltage command;
and
a second inverter converting D.C. power to A.C. power based on the second three-phase voltage command to the three-phase induction motor.

14 more elements

Facts

Application

10/750,692Filed 31 Dec 2003

Priority

KR 10-2003-00452154 Jul 2003

Published

US 2005/0002210 A16 Jan 2005

Granted

7 Mar 2006

Term ends

Not estimatedThe source records don’t support an estimate.

Classification12 codes

H02M 7/5387
Using semiconductor devices only, e.g. single switched pulse inverters: in a bridge configuration
B60L 15/025
Characterised by the form of the current used in the control circuit: using field orientation; Vector control; Direct Torque Control [DTC]
B60L 50/16
Using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines: with provision for separate direct…
B60L 2220/12
Electrical machine types: induction machines