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Rotate speed tracking and restarting method for high voltage frequency converter

A high-voltage inverter, restarting technology, applied in the direction of motor generator control, control of electromechanical brakes, control of electromechanical transmission devices, etc., can solve the problems of high cost and large battery capacity, and achieve stable stator current without overcurrent, stable stator current, etc. The effect of keeping the speed of the auxiliary engine unchanged

Active Publication Date: 2016-02-24
JIANGSU ELECTRIC POWER CO +3
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Problems solved by technology

However, most of the high-voltage inverters currently adopt a cascaded structure without a unified DC bus. At the same time, the power of the high-voltage inverters is mostly in the megawatt class, and the required battery capacity is huge and the cost is very high.

Method used

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  • Rotate speed tracking and restarting method for high voltage frequency converter
  • Rotate speed tracking and restarting method for high voltage frequency converter
  • Rotate speed tracking and restarting method for high voltage frequency converter

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings.

[0024] like figure 1 As shown, the present invention provides a high-voltage inverter speed tracking restart method, and the typical waveforms of the rotor speed and stator voltage and current during the whole process are as follows: figure 2 shown. Including the following steps:

[0025] Step 1: Monitor the low-voltage protection signal of the high-voltage inverter in real time. After the inverter locks the output, the timer starts timing, and calculates the demagnetization time t according to the motor speed and motor power during power failure. qc . t qc For the decay of the residual magnetic voltage from power-off to close to zero (according to the accuracy of the measuring equipment, it can be set to 1% U N , U N This period of time is the rated voltage of the motor. The demagnetization time is mainly related to the operating frequency and motor power. The...

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Abstract

The invention discloses a rotate speed tracking and restarting method for a high voltage frequency converter, and provides a rotate speed tracking and restarting method integrated with remanent magnetism voltage detection and torque current measurement, taking the length of the power-off duration as the criteria for detecting different electrical quantities. The rotate speed tracking and restarting method for a high voltage frequency converter includes the steps: when the power-off duration is short, utilizing a tracking method for detecting the remanent magnetism voltage of a stator; when the power-off duration is long, utilizing a tracking method based on the torque current; applying the test voltage at the stator side, taking a stator voltage vector to perform orientation, and measuring the torque component of the stator current until the torque component is close to zero while the synchronous rotate speed corresponding to the test voltage frequency is the rotate speed of a rotor; and finally, being the restarting phase, ordering the voltage frequency ratio to rise step by step and then ordering the upgraded voltage frequency ratio to recover to a normal voltage frequency ratio and to boost to a target value. The rotate speed tracking and restarting method for a high voltage frequency converter has no requirement for adding extra hardware devices, and can track any rotate speeds of an auxiliary engine, and is high in reliability and is simple in setting.

Description

technical field [0001] The invention relates to a high-voltage frequency converter speed tracking restart method, which belongs to the technical field of high-voltage frequency converter control. Background technique [0002] In recent years, in order to achieve energy saving and emission reduction, a large number of frequency conversion transformations have been carried out on the auxiliary machines of thermal power units. However, at present, most auxiliary high-voltage inverters of thermal power units do not have low-voltage ride-through capability. When the input voltage drops below 65% of the rated value, it will automatically stop output and stop running. It cannot be restarted automatically, it can only be started manually by the operator. In order to reduce losses, when a transient voltage drop occurs, it is necessary to improve the low-voltage ride-through capability of the high-voltage inverter-auxiliary system, try to keep the speed of the auxiliary machine stabl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/34
Inventor 黄学良姚新阳王正齐胡伟顾文徐贤王成亮唐一铭李辰龙
Owner JIANGSU ELECTRIC POWER CO
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