# US 11,451,174 B2 · Method of reducing estimation vectors in a model predictive control of alternating current motors

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,451,174 B2
- Document ID: US11451174B2
- Status: Granted
- Kind: B2
- Application number: 17/272,676
- Filed: 2019-10-02
- Published: 2021-11-04
- Granted: 2022-09-20
- Earliest claimed: 2018-10-03
- Assignees: Orta Dogu Teknik Universitesi
- Applicants: Orta Dogu Teknik Universitesi
- Inventors: Ilker Sahin; Ozan Keysan
- Web page: https://patentgrep.com/patent/US11451174B2

## CPC

- H02P 21/0017: {Model reference adaptation, e.g. MRAS or MRAC, useful for control or parameter estimation}
- H02P 23/0004: {Control strategies in general, e.g. linear type, e.g. P, PI, PID, using robust control}
- H02M 7/53873: {with digital control}
- H02M 7/53876: {based on synthesising a desired voltage vector via the selection of appropriate fundamental voltage vectors, and corresponding dwelling times}
- H02P 21/14: Estimation or adaptation of machine parameters, e.g. flux, current or voltage
- H02P 23/0077: {Characterised by the use of a particular software algorithm}
- H02P 27/06: using DC to AC converters or inverters (H02P27/05 takes precedence)
- H02P 2207/01: Asynchronous machines
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- 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)

## Abstract

A method for reducing a total operational load of a method of a model predictive control-by conducting simplifications based on specific observations, in order to drive alternating current motors by using the method of the MPC with a two-level voltage source inverter. The method includes the steps of determining at which one of the predefined sectors a resultant of stator currents is present, determining a motor mode, reducing seven estimation vectors to four estimation vectors and calculating a cost function or reducing seven estimation vectors to five estimation vectors and calculating the cost function.

## Claims

### Claim 1

A method of reducing estimation vectors in a model predictive control of alternating current motors, comprising the following steps:
determining at which one of predefined sectors a resultant of stator currents is present in order to enable a process load in a cost function to be reduced to provide sector data,
determining a motor mode corresponding to requirements of a motor driver during determining a sector location to provide motor mode data,
reducing seven estimation vectors, wherein seven estimation vectors comprise six active estimation vector and one zero estimation vector, to four estimation vectors, wherein the four estimation vectors comprise three active estimation vectors and one zero estimation vector, and calculating the cost function depending on the sector data and the motor mode data determined,
or reducing the seven estimation vectors, wherein seven estimation vectors comprise six active estimation vector and one zero estimation vector, to five estimation vectors, wherein the five estimation vectors comprise four active estimation vectors and one zero estimation vector, and calculating the cost function only by taking a rotational direction of a motor into consideration without using the step of determining the motor mode.

### Claim 2 (depends on 1)

The method according to claim 1, wherein a sector definition is carried out by shifting sector boundaries 30° forward with a division of a plane α-β into sectors.

### Claim 3 (depends on 1)

The method according to claim 1, wherein a selection of zero estimation vectors is performed by not switching on or off switches of a phase, wherein the phase has a maximum current at a given moment.