Control system for inverter
US-2016248317-A1 · Aug 25, 2016 · US
Differential protection method for bridge circuit in current converter control system
US9667131B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9667131-B2 |
| Application number | US-201615076662-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 22, 2016 |
| Priority date | Jun 30, 2015 |
| Publication date | May 30, 2017 |
| Grant date | May 30, 2017 |
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- Title
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Abstract
Official abstract text for this publication.
The present invention relates to a differential protection method for bridge circuit in current converter control system, including the steps of: 1). obtaining sample values of the three-phase current for the current converter control system at AC side thereof, and calculating the absolute value of each sampling value respectively; 2). calculating a value of current at the AC side of the current converter control system; and 3). determining whether to perform a relay protection for the current converter control system according to the value current at the AC side of the current converter control system. The method of the present invention provided, is fast, convenient, and with a small amount of calculation. The current converter control system determines whether to perform a relay protection in a short time. Also it reduces the possibility that the equipment burned because of cannot break the circuit in time.
First claim
Opening claim text (preview).
What is claimed is: 1. A differential protection method for bridge circuit in current converter control system, being characterized in that, the differential protection method includes the steps of: 1). obtaining sample values of the three-phase current for the current converter control system at AC side thereof, and calculating the absolute value of each sampling value respectively; 2). calculating the value of current at the AC side of the current converter control system by the step of: the value of current at the AC side being k1 times of the sum of three absolute values of sample values; and 3). determining whether to perform a relay protection for the current converter control system according to the value current at the AC side of the current converter control system by the step of: If |Id−iv|>k2, performing a relay protection; wherein, k1 is a value between 0 to 1, Id is an actual measured value of direct current side of the current converter control system, iv is a current value of AC side, and k2 is a set value greater than 0. 2. The differential protection method for bridge circuit in current converter control system of claim 1 , being characterized in that, the k1 is equal to ½. 3. The differential protection method for bridge circuit in current converter control system of claim 1 , being characterized in that, the k2=0.5×IdN, where in, IdN is a rating value of DC current.
Assignees
Inventors
Classifications
using discharge tubes with control electrode or semiconductor devices with control electrode · CPC title
in a bridge configuration · CPC title
- H02M1/32Primary
Means for protecting converters other than automatic disconnection · CPC title
Electricity · mapped topic
using semiconductor devices only · CPC title
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- What does patent US9667131B2 cover?
- The present invention relates to a differential protection method for bridge circuit in current converter control system, including the steps of: 1). obtaining sample values of the three-phase current for the current converter control system at AC side thereof, and calculating the absolute value of each sampling value respectively; 2). calculating a value of current at the AC side of the curren…
- Who is the assignee on this patent?
- Xj Group Corp, Xuchang Xj Software Tech Ltd, Xj Electric Co Ltd, and 2 more
- What technology area does this patent fall under?
- Primary CPC classification H02M1/32. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue May 30 2017 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 2 related publications on this page (citations in our corpus or others sharing the same primary CPC).