# US 2014/0152012 A1 · Systems and methods for utilizing an active compensator to augment a diode rectifier

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- Number: US 2014/0152012 A1
- Document ID: US20140152012A1
- Status: Published application
- Kind: A1
- Application number: 14/025,534
- Filed: 2013-09-12
- Published: 2014-06-05
- Earliest claimed: 2012-12-04
- Assignees: ABB Research Ltd.
- Applicants: ABB Research Ltd.
- Inventors: Hongrae Kim; Jouko Niiranen; Jyoti Sastry
- Web page: https://patentgrep.com/patent/US20140152012A1

## CPC

- H02P 9/007: {Control circuits for doubly fed generators}
- H02J 3/18: Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02M 1/12: Arrangements for reducing harmonics from AC input or output
- H02P 23/26: Power factor control [PFC]
- H02J 3/1842: having reactive elements actively controlled by bridge converters, e.g. active filters or static compensators [STATCOM]
- H02M 1/4283: {by adding a controlled rectifier in parallel to a first rectifier feeding a smoothing capacitor}
- Y02B 70/10: Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
- Y02E 10/76: Power conversion electric or electronic aspects
- Y02E 40/20: Active power filtering [APF]
- Y02E 40/30: Reactive power compensation
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P)
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

The subject matter described herein includes an active compensatory augmented diode bridge rectifier system. According to one aspect, the system comprises a generator unit configured to generate a current flow comprised entirely of active current and a diode rectifier configured to receive the active current from the generator unit, to direct the active current to a connected power grid, and to receive a reactive current. The system further includes an active compensator configured to optimize the generator unit to produce the active current and to generate the reactive power used to facilitate the operation of the diode rectifier.

## Claims

### Claim 1

A system for utilizing an active compensator to augment a diode rectifier, the system comprising:
a generator unit configured to generate a current flow substantially comprised of active current;
a diode rectifier configured to receive the active current from the generator unit, to direct the active current to a connected power grid, and to receive a reactive current; and
an active compensator configured to optimize the generator unit to produce the active current and to generate the reactive power used to facilitate the operation of the diode rectifier.

### Claim 2 (depends on 1)

The system of claim 1 wherein the current flow generated by the generator unit includes zero reactive current.

### Claim 3 (depends on 1)

The system of claim 1 wherein the generator unit includes a wind power generator unit.

### Claim 4 (depends on 1)

The system of claim 1 wherein the generator unit includes a surface permanent magnet synchronous generator (SPMSG) unit.

### Claim 5 (depends on 1)

The system of claim 1 wherein the generator unit includes a frame structure that is sized to accommodate the generation of the active current while the generator unit is experiencing an applied full load.

### Claim 6 (depends on 1)

The system of claim 1 wherein the active compensator is configured to optimize the generator unit by adjusting a direct axis (d-axis) current included in a synchronous reference frame to an optimal operating point, wherein the synchronous reference frame represents the generator unit.

### Claim 7 (depends on 6)

The system of claim 6 wherein the d-axis is adjusted to the optimal operating point by adjusting a stator current produced by the generator unit to be aligned along the d-axis.

### Claim 8 (depends on 6)

The system of claim 6 wherein the optimal operating point includes a point on a maximum torque per ampere (MTPA) curve.

### Claim 9 (depends on 1)

The system of claim 1 wherein the active compensator includes either a plurality of insulated gate bipolar transistor (IGBT) semiconductor devices or a plurality of integrated gate commutated thyristors (GCT) semiconductor devices.

### Claim 10 (depends on 8)

The system of claim 8 wherein the active compensator includes at least six IGBT circuits.

### Claim 11 (depends on 1)

The system of claim 1 wherein the diode rectifier includes a diode bridge rectifier.

### Claim 12 (depends on 1)

The system of claim 1 wherein a processing unit associated with the active compensator is configured to determine an amount of the reactive current by utilizing a vector calculation or a mathematical formula.

### Claim 13 (depends on 1)

The system of claim 1 wherein the active compensator includes a STATCOM device.

### Claim 14

A method for utilizing an active compensator to augment a diode rectifier, the method comprising;
receiving, at an active compensator, a power related measurement from a generator unit;
configuring the generator unit, based on the power related measurement, to produce a current flow substantially comprised of active current;
determining an amount of reactive power that enables a diode rectifier to transfer the active current to a power grid;
generating the determined amount of reactive power at the active compensator; and
providing the determined amount of reactive current to the diode rectifier.

### Claim 15 (depends on 14)

The method of claim 14 wherein the current flow generated by the generator unit includes zero reactive current.

### Claim 16 (depends on 14)

The method of claim 14 wherein the generator includes a wind power generator unit.

### Claim 17 (depends on 14)

The method of claim 14 wherein the generator unit includes a surface permanent magnet synchronous generator (SPMSG) unit.

### Claim 18 (depends on 14)

The method of claim 14 wherein the generator unit includes a frame structure that is sized to accommodate the generation of the active current while the generator unit is experiencing an applied full load.

### Claim 19 (depends on 14)

The method of claim 14 wherein configuring the generation unit includes adjusting a direct axis (d-axis) current included in a synchronous reference frame to an optimal operating point, wherein the synchronous reference frame represents the generator unit.

### Claim 20 (depends on 19)

The method of claim 19 wherein adjusting the d-axis to the optimal operating point includes adjusting a stator current produced by the generator unit to be aligned along the d-axis.

### Claim 21 (depends on 19)

The method of claim 19 wherein the optimal operating point includes a point on a maximum torque per ampere (MTPA) curve.

### Claim 22 (depends on 14)

The method of claim 14 wherein the active compensator includes either a plurality of insulated gate bipolar transistor (IGBT) semiconductor devices or a plurality of integrated gate commutated thyristors (IGCT) semiconductor devices.

### Claim 23 (depends on 22)

The method of claim 22 wherein the active compensator includes at least six IGBT semiconductor devices.

### Claim 24 (depends on 14)

The method of claim 14 wherein the diode rectifier includes a diode bridge rectifier.

### Claim 25 (depends on 14)

The method of claim 14 wherein determining the amount of the reactive current includes utilizing a vector calculation or a mathematical formula.

### Claim 26 (depends on 14)

The method of claim 14 wherein the active compensator includes a STATCOM device.