System and method for stabilizing sub-synchronous interaction of a wind turbine generator
US-2016254769-A1 · Sep 1, 2016 · US
Closed loop flux weakening for permanent magnet synchronous motors
US10008967B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10008967-B2 |
| Application number | US-201615333249-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 25, 2016 |
| Priority date | Oct 25, 2016 |
| Publication date | Jun 26, 2018 |
| Grant date | Jun 26, 2018 |
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Abstract
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A closed loop flux weakening method and apparatus are provided. The closed loop flux weakening apparatus may include a difference circuit that obtains a difference between a q-axis reference voltage and a q-axis voltage, a controller that converts the difference between the q-axis reference voltage and the q-axis voltage into a d-axis current of a stator of the motor, and a summation circuit that obtains a d-axis reference current by adding the d-axis current of the stator of the motor and a feed forward d-axis current of the stator of the motor.
First claim
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What is claimed is: 1. An apparatus for generating a d-axis reference current used for controlling a motor, the apparatus comprising: a difference circuit that obtains a difference between a q-axis reference voltage and a q-axis voltage; a controller that converts the difference between the q-axis reference voltage and the q-axis voltage into a corrective d-axis current of a stator of the motor; and a summation circuit that obtains the d-axis reference current by adding the corrective d-axis current of the stator of the motor and a feed forward d-axis current of the stator of the motor; wherein the q-axis reference voltage, V qref , is determined based on the following equation: V qref =√{square root over (V max 2 −V d 2 )}; wherein V max 2 is the square of a maximum voltage that can be applied to the motor; and wherein V d 2 is the square of a d-axis voltage of the motor; and wherein the d-axis reference current is used to control the motor. 2. The apparatus of claim 1 , wherein the feed forward d-axis current of the stator of the motor, I ds _ feedfw , is determined based on the following equation: I ds_feedfw = V q ref - ( r s × i q ref + L qs × di q ref dt + E ) ω × L ds wherein, r s is a stator resistance of the motor; wherein, i q ref is a q-axis reference current; wherein, L qs is a q-axis inductance of the stator of the motor; wherein, di q ref dt is a derivative of the q-axis reference current with respect to time; wherein, E is the back electromotive force of the motor; wherein, ω is the electrical speed of the motor; and wherein, L ds is the d-axis inductance of the stator of the motor. 3. The apparatus of claim 1 , wherein the difference circuit receives the q-axis reference voltage at a positive input of the difference circuit and receives the q-axis voltage at a negative input of the difference circuit. 4. An apparatus for generating a d-axis reference current used for controlling a motor, the apparatus comprising: a difference circuit that obtains a difference between a q-axis reference voltage and a q-axis voltage; a controller that converts the difference between the q-axis reference voltage and the q-axis voltage into a corrective q-axis voltage of a stator of the motor; a gate that converts the corrective q-axis voltage of the stator of the motor into a d-axis current of a stator of the motor; and a summation circuit that obtains the reference current by adding the d-axis current of the stator of the motor and a feed forward d-axis current of the stator of the motor; wherein the q-axis reference voltage, V qref , is determined based on the following equation: V qref =√{square root over (V max 2 −V d 2 )}; wherein V max 2 is the square of a maximum voltage of the motor; wherein V d 2 is the square of a d-axis voltage of the motor; and wherein the d-axis reference current is used to control the motor. 5. The apparatus of claim 4 , wherein the feed forward d-axis current of the stator of the motor, I ds _ feedfw , is determined based on the following equation: I ds_feedfw = V q ref - ( r s × i q ref + L qs × di q ref dt + E ) ω × L ds wherein, r s is a stator resistance of the motor; wherein, i q ref is a q-axis reference current; wherein, L qs is a q-axis inductance of the stator of the mo
Assignees
Inventors
Classifications
- H02P21/141Primary
Flux estimation · CPC title
- H02P21/0089Primary
using field weakening · CPC title
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Frequently asked questions
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- What does patent US10008967B2 cover?
- A closed loop flux weakening method and apparatus are provided. The closed loop flux weakening apparatus may include a difference circuit that obtains a difference between a q-axis reference voltage and a q-axis voltage, a controller that converts the difference between the q-axis reference voltage and the q-axis voltage into a d-axis current of a stator of the motor, and a summation circuit th…
- Who is the assignee on this patent?
- Microchip Tech Inc, Microchip Tech Inc
- What technology area does this patent fall under?
- Primary CPC classification H02P21/141. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Jun 26 2018 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).