Variable frequency transformer control system

A frequency conversion transformer and control system technology, applied in the field of frequency conversion transformers, can solve problems such as large frequency difference, incomplete compensation, system instability, etc.

Active Publication Date: 2012-05-02
STATE GRID CORP OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the DC motor does not output torque, due to the electromagnetic coupling between the stator and rotor windings, the angular velocity of the rotor itself will tend to the angular velocity difference between the asynchronous AC systems on both sides, but this frequency difference cannot be completely compensated, resulting in The transmission power of the frequency conversion transformer changes sinusoidally and periodically
If the frequency difference is large and the system power fluctuates too much, it may lead to system instability

Method used

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Embodiment Construction

[0039] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

[0040] At the same time, it should be understood that, for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0041] The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses.

[0042] Techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods and devices should be considered part of the Authoriz...

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Abstract

The invention discloses a variable frequency transformer (VFT) control system, relating to the variable frequency transformer technology field. The control system comprises a trigger angle control unit which determines a trigger angle according to rotating speed of a rotor, command torque and measurement torque; a rectifying device which adjusts output voltage according to the trigger angle; a direct current motor which can be in coaxial arrangement with the rotor and determines output torque according to the output voltage from the rectifying device. The invention discloses a three-level control system of a VFT device, an apparatus and a system, provides a variable frequency transformer control system whole block diagram, establishes a VFT direct current motor driving system comprising a rectification trigger loop, researches and designs concrete control block diagrams and key parameters of main functions of VFT bottom layer trigger angle control, middle layer convey power control, high layer system application control the like, and establishes a base for realizing various functions of a variable frequency transformer.

Description

technical field [0001] The present invention relates to the technical field of variable frequency transformer (Variable Frequency Transformer, VFT), in particular to a variable frequency transformer control system. Background technique [0002] At present, the main means to realize the interconnection of large power grids in the world are AC synchronous networking and DC asynchronous networking. These two methods have their own characteristics. AC synchronous networking can not only realize active power exchange, but also automatically balance the reactive power of interconnected systems within a certain range. Through AC networking to build a strong sending-end power grid or receiving-end power grid, the more generators connected to the synchronous power grid, the greater the inertia of the synchronous power grid, which can significantly enhance the ability of the synchronous power grid to cope with failures and accept power from outside the region. On the other hand, wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P7/292
Inventor 陈葛松周孝信
Owner STATE GRID CORP OF CHINA
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