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Instantaneous power-down rebooting method for grid of high-voltage frequency converter

A high-voltage frequency converter, power-off restart technology, applied in the direction of single-network parallel feeding arrangement, etc., to achieve wide application prospects and small impact

Inactive Publication Date: 2010-12-22
RONGXIN POWER ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no report on the high-voltage frequency converter that can realize the function of instantaneous power failure and restart of the power grid

Method used

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  • Instantaneous power-down rebooting method for grid of high-voltage frequency converter
  • Instantaneous power-down rebooting method for grid of high-voltage frequency converter
  • Instantaneous power-down rebooting method for grid of high-voltage frequency converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Test conditions:

[0042] 1. Nine-stage power unit series voltage source type phase shifting inverter

[0043] 2. 10kV grid voltage

[0044] 3. Large inertia motor

[0045] Test parameter settings:

[0046] 1. 60s speed up time setting

[0047] 2. 20s-150s deceleration time setting (i.e. frequency deceleration step 0.33Hz-2.5Hz)

[0048] 3. The power unit capacitor voltage maintenance range is 700V-1000V

[0049] Test content:

[0050]1. The high-voltage inverter is dropped from the high-voltage power grid under various normal operating speed conditions, and the maintenance time of the high-voltage inverter's normal operation is observed. The test data are shown in Table 1. It can be seen from the data in the table that when the high-voltage power grid falls, the higher the motor operating frequency, the longer the high-voltage inverter can maintain stable operation. When the high-voltage inverter stops, the motor has stopped rotating, and there is no energy feed...

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Abstract

The invention relates to an instantaneous power-down rebooting method for a grid of a high-voltage frequency converter. In the method, when instantaneous power down of the grid occurs, the state of a motor is converted into a generator state by controlling PWM waveout of a power unit, so that energy is fed back to the power unit of the high-voltage frequency converter to maintain a capacitor voltage of the power unit of the high-voltage frequency converter; when the grid recovers, the generator state of the motor is converted into the motor state, and the rotational speed automatically rises to original set value. The high-voltage frequency converter is a voltage-source type phase-shifting frequency converter comprising series-connected multi-level power units, and adopts large-inertia blower load. The method can solve the problem of big fluctuation of high-voltage source system or instantaneous power-down protection caused by switching the high-voltage source system, realize the continuous and stable operation of high-voltage frequency converter and motor when instantaneous power down of the grid occurs and the automatic speed rise to the original set value when grid returns to normal.

Description

technical field [0001] The invention relates to a control method of a high-voltage frequency converter, in particular to a method for restarting a high-voltage frequency converter power grid instantaneously. Background technique [0002] In large-scale industrial systems, the use of high-voltage frequency converters to drive motors is becoming more and more widely used, with larger and larger capacities, more and more related systems, and higher and higher levels of requirements, and the corresponding performance requirements for high-voltage frequency converters are accordingly It's getting stricter. [0003] When reclosing and mutual switching are performed in the high-voltage power system, due to factors such as arc extinguishing and degaussing of the high-voltage power grid, there will be a short power-off time interval in the power grid. In order to protect itself or not cause a greater accident, the high-voltage inverter will trip and stop running when the grid is pow...

Claims

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Application Information

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IPC IPC(8): H02J3/38
Inventor 赵淑玉张坤王振郭自勇丁雅丽李旷龙浩王晓敏鞠云华
Owner RONGXIN POWER ELECTRONICS
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