APPARATUS FOR CONTROLLING PARALLELED INVERTER

• US 20150138855A1
• Filed: 11/12/2014
• Published: 05/21/2015
• Est. Priority Date: 11/19/2013
• Status: Active Grant

• Current Assignee: LSIS Co. Ltd. (LS Corporation)
• Original Assignee: LSIS Co. Ltd. (LS Corporation)
• Inventors: PARK, Jong Je
• Granted Patent: US 9,806,631 B2
• Time in Patent Office: Days
• US Class Current: 363/71
• CPC Class Codes: H02M 7/42 Conversion of dc power input into ac power output without possibility of reversal
• CPC Class Codes: H02M 7/49 Combination of the output voltage waveforms of a plurality of converters
• CPC Class Codes: H02M 7/493 the static converters being arranged for operation in parallel

Abstract

An apparatus for controlling paralleled inverter is disclosed. In the apparatus for controlling paralleled inverter, one synchronization signal is shaped by at least two inverters to respectively transmit a voltage command and an operation command.

Claims

1. An apparatus for controlling paralleled inverter configured to control at least two paralleled inverters, the apparatus comprising:

a controller configured to respectively transmit operation information to at least two inverters by one synchronization signal;

a detection unit configured to respectively detect output currents of at least two inverters; and

at least two interface units configured to respectively transmit the operation information of the controller to the at least two inverters.

2. The apparatus of claim 1, wherein the controller is further configured to correct the operation information by performing a proportional integral (PI) control with an error of output currents of the at least two inverters.

3. The apparatus of claim 1, wherein the operation information includes a voltage command and an operation command

4. The apparatus of claim 1, wherein the controller transmits the operation information to the at least two interface units using a predetermined communication type.

5. The apparatus of claim 4, wherein the predetermined communication type includes a controller area network (CAN).

6. The apparatus of claim 4, wherein each interface unit transmits an optical signal to the inverter by converting an electric signal transmitted from the controller to the optical signal, and transmits an electric signal to the controller by converting the optical signal received from the inverter to the electric signal.

7. The apparatus of claim 1, wherein each inverter includes:

a plurality of cell controllers configured to generate a PWM signal in response to the operation information; and

a plurality of power cells, each connected to each of the plurality of cell controllers, to generate a voltage provided to a motor in response to the PWM signal.

8. The apparatus of claim 7, wherein the cell controller transmits data from the power cell to the controller.

9. The apparatus of claim 8, wherein the data from the power cell includes an output current of the power cell, a DC-link voltage and trip information.