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Method for driving synchronous machine to operation using power source type frequency converter

A synchronous motor, voltage source type technology, applied in motor generator control, motor/generator/inverter limiter, AC motor control, etc. Harmonic pollution is small and other problems, to reduce the failure rate, expand the scope of applications, and reduce costs

Active Publication Date: 2008-01-02
BEIJING LEADER & HARVEST ELECTRIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The voltage source inverter with this structure has been widely used in the field of frequency conversion and speed regulation of asynchronous motors because of its small harmonic pollution to the power grid, low machine terminal voltage distortion rate, small torque ripple, and low cost. It has been highly recognized by users and the market, but this type of inverter is rarely used in the field of frequency conversion and speed regulation of synchronous motors.

Method used

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  • Method for driving synchronous machine to operation using power source type frequency converter
  • Method for driving synchronous machine to operation using power source type frequency converter
  • Method for driving synchronous machine to operation using power source type frequency converter

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Embodiment Construction

[0029] The frequency converter used in the present invention is a voltage source type frequency converter, which is composed of a multi-winding transformer, an AC-DC-AC frequency converter, a control system and optional auxiliary mechanisms (such as a bypass cabinet, etc.). The synchronous motor to be controlled is an ordinary synchronous motor with an excitation winding. It can be a motor or a generator; in structure, it can be a salient-pole synchronous motor or a salient-pole synchronous motor. The frequency converter control system and the synchronous motor excitation device realize coordinated control of the synchronous motor through time sequence coordination and / or communication.

[0030] 1. Principle description

[0031] After theoretical analysis, simulation verification, and physical system operation verification, the present invention adopts the following control methods to control the start, stop, operation process and faults of the synchronous motor:

[0032] 1. Start...

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PUM

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Abstract

The invention discloses a method for using voltage source frequency converter to drive a synchronous motor, comprising a control method on the start synchronization of synchronous motor, a control method in continuous operation, a control method on normal stop and emergency stop, a method cooperated controlling the excitation device of the synchronous motor, and an accident protect method in the operation of the synchronous motor. The invention is characterized in that the invention can use voltage resource frequency-converter to drive synchronous motor, to stably start, stop and operate at high-frequency of frequency conversion. And in emergency, the invention can reliably protect synchronous motor, frequency converter and the excitation device.

Description

Technical field [0001] The invention relates to a method for using a voltage source type frequency converter to drive a synchronous motor to operate. Specifically, the invention relates to a method for using a voltage source type frequency converter to drive a synchronous motor to start, stop, operate adjustment and fault protection. Background technique [0002] High-voltage (medium-voltage) synchronous motors have been widely used in metallurgy, chemical engineering and other fields because of their high power factor, stable running speed, and easy low-speed design. Due to excessive design margins and other reasons, a large number of synchronous motors have low operating efficiency during actual work and waste a lot of energy. [0003] The application of high-voltage (medium-voltage) frequency converters makes it possible for synchronous motors to operate with energy-saving speed regulation. Due to the complex physical model of the synchronous motor and the high control difficu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/04H02P6/08H02P3/18
Inventor 马永健
Owner BEIJING LEADER & HARVEST ELECTRIC TECH
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