Bus capacitor bank configuration for a multi-level regenerative drive

• US 10,008,917 B2
• Filed: 12/18/2013
• Issued: 06/26/2018
• Est. Priority Date: 12/18/2013
• Status: Active Grant

• Current Assignee: Otis Elevator Company (Otis Worldwide Corp.)
• Original Assignee: Otis Elevator Company (Otis Worldwide Corp.)
• Inventors: Agirman, Ismail, Millett, Steven M., Krishnamurthy, Shashank, Wang, Yang
• Primary Examiner(s): Warren, David
• Application Number:
  US15/104,195
• Publication Number:
  US 20170005562A1
• Time in Patent Office: 1,651 Days
• Field of Search: 187289
• CPC Class Codes: B66B 1/302 for energy saving
• CPC Class Codes: B66B 1/32 effective on braking devices , e.g. acting on electrically controlled brakes brake control H02P, lift brakes per se B66B5/02
• CPC Class Codes: H02M 1/007 Plural converter units in cascade push-pull DC/DC converters with pre-regulator H02M3/3374; DC-AC converters following a DC-DC stage including a high frequency transformer H02M7/4807; DC-AC converters following a DC-DC conversion stage generating periodically varying voltages H02M7/4826
• CPC Class Codes: H02M 1/12 Arrangements for reducing harmonics from ac input or output
• CPC Class Codes: H02M 5/458 using semiconductor devices only
• CPC Class Codes: H02M 5/4585 having a rectifier with controlled elements
• CPC Class Codes: H02M 7/487 Neutral point clamped inverters
• CPC Class Codes: H02P 3/14 by regenerative braking
• CPC Class Codes: H02P 3/18 for stopping or slowing an ac motor
• CPC Class Codes: H03H 7/004 Capacitive coupling circuits not otherwise provided for

Abstract

A regenerative drive device and a method for configuring the DC link of a regenerative drive device are disclosed. The multilevel regenerative drive device may include an inverter having a plurality of power components and a converter having a plurality of power components. The multilevel regenerative drive device may also include a direct current (DC) link bridging the inverter and the converter, the DC link including a capacitor, an inverter neutral point, and a converter neutral point independent of the inverter neutral point. Alternatively, the inverter neutral point and the converter neutral point may be connected.

Claims

1. A multilevel regenerative drive device, comprising:

an inverter having a plurality of power components;

a converter having a plurality of power components;

a direct current link bridging the inverter and the converter, the DC link comprising;

a capacitor;

an inverter neutral point; and

a converter neutral point independent of the inverter neutral point;

wherein one of the inverter and the converter operates in a bipolar pulse-width modulation mode and an other of the inverter and the converter operates in a unipolar pulse-width modulation mode.

2. The multilevel regenerative drive device of claim 1, wherein at least one member of the plurality of power components of the inverter and at least one member of the plurality of power components of the converter is an insular-gate bipolar transistor.

3. The multilevel regenerative drive device of claim 1, wherein the plurality of power components of the inverter and the plurality of power components of the converter are arranged having a T-type topology.

4. The multilevel regenerative drive device of claim 1, wherein the plurality of power components of the inverter and the plurality of power components of the converter are arranged having a neutral-point-clamped topology.

5. The multilevel regenerative drive device of claim 1, wherein the multilevel regenerative drive device is a multilevel regenerative elevator drive device.

6. A multilevel regenerative drive device, comprising:

an inverter having a plurality of power components;

a converter having a plurality of power components;

a direct current link bridging the inverter and the converter, the DC link comprising;

a capacitor;

an inverter neutral point; and

a converter neutral point independent of the inverter neutral point;

wherein the plurality of power components of the inverter and the plurality of power components of the converter are arranged having an advanced T-type neutral point clamped topology.

7. The multilevel regenerative drive device of claim 6, wherein at least one member of the plurality of power components (65, 68) of the inverter and at least one member of the plurality of power components (65, 68) of the converter is a reverse-blocking insular-gate bipolar transistor.

8. A multilevel regenerative drive device, comprising:

an inverter having a plurality of power components;

a converter having a plurality of power components;

a direct current link bridging the inverter and the converter, the DC link comprising;

a capacitor;

a neutral point, the neutral point shared by the inverter and the converter;

wherein one of the inverter and the converter operates in a bipolar pulse-width modulation mode and an other of the inverter and the converter operates in a unipolar pulse-width modulation mode.

9. The multilevel regenerative drive device of claim 8, wherein at least one member of the plurality of power components of the inverter and at least one member of the plurality of power components of the converter is an insular-gate bipolar transistor.

10. The multilevel regenerative drive device of claim 8, wherein the plurality of power components of the inverter and the plurality of power components of the converter are arranged having a T-type topology.

11. The multilevel regenerative drive device of claim 8, wherein the plurality of power components of the inverter and the plurality of power components of the converter are arranged having a neutral-point-clamped topology.

12. The multilevel regenerative drive device of claim 8, wherein the multilevel regenerative drive device is a multilevel regenerative elevator drive device.

13. A multilevel regenerative drive device, comprising:

an inverter having a plurality of power components;

a converter having a plurality of power components;

a direct current link bridging the inverter and the converter, the DC link comprising;

a capacitor;

a neutral point, the neutral point shared by the inverter and the converter;

wherein the plurality of power components (65, 68) of the inverter and the plurality of power components (65, 68) of the converter are arranged having an advanced T-type neutral point clamped topology.

14. The multilevel regenerative drive device of claim 13, wherein at least one member of the plurality of power components of the inverter and at least one member of the plurality of power components of the converter is a reverse-blocking insular-gate bipolar transistor.

15. A method for configuring a DC link for a multilevel regenerative drive device, the multilevel regenerative elevator drive device having an inverter having a plurality of power components and a converter having a plurality of power components, the method comprising:

determining a neutral point associated with the inverter; and

determining a neutral point associated with the converter, the neutral point of the converter being independent of the neutral point associated with the inverter;

wherein one of the inverter and the converter operates in a bipolar pulse-width modulation mode and an other of the inverter and the converter operates in a unipolar pulse-width modulation mode.

16. A method for configuring a DC link for a multilevel regenerative drive device, the multilevel regenerative elevator drive device having an inverter having a plurality of power components and a converter having a plurality of power components, the method comprising:

determining a neutral point associated with the inverter;

determining a neutral point associated with the converter, the neutral point of the converter being independent of the neutral point associated with the inverter; and

connecting the neutral point associated with the inverter to the neutral point associated with the converter.