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Low-voltage automatic self synchronizing grid connection technique for short circuit testing generator

A short-circuit test, generator technology, applied in the direction of single-network parallel feeding arrangement, etc.

Inactive Publication Date: 2016-02-03
SUZHOU APP SCI ACAD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because according to the conventional grid-connected technology, it is necessary to purchase 4 sets of microcomputer automatic grid-connected devices, and wiring debugging is also required

Method used

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  • Low-voltage automatic self synchronizing grid connection technique for short circuit testing generator

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Embodiment Construction

[0011] Illustrate the embodiment of the present invention below by specific example, and this process is as follows: 1) short-circuit test generator stator outlet circuit breaker closes earlier access parallel busbar, 2) puts 10 to several generators to be operated in parallel at the same time ~20% excitation current, at this time the generators to be paralleled have the same voltage, same rotation direction, correct phase sequence, but different phases. 3) The stator windings of several generators produce circulating currents that do not exceed the rated value. Under the action of the electromagnetic torque generated by the circulating currents, the generators are pulled into a synchronous state, and the circulating currents of the stator windings are reduced to close to zero current. This process takes 2s 4) continue to increase the engine terminal voltage to the rated value.

[0012] The above are only specific application examples of the present invention, and do not const...

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Abstract

The invention discloses a low-voltage automatic self synchronizing grid connection technique for a short circuit testing generator. The short circuit testing generator needing a parallel operation is sure to be driven by an asynchronous induction motor; the short circuit testing generator driven by a synchronous motor is not in the case of the invention; a plurality of units are in asynchronous operation in the initial period of grid connection; 10-20% of exciting currents are added to the multiple units simultaneously, and 20-30% of unit terminal voltage is established; the voltage phases of the units are different, so that ring current not exceeding a rated value is generated among the units; and the ring current generates synchronous torque, and the multiple units are driven to the synchronous operation within two seconds.

Description

technical field [0001] The patent of the present invention relates to a new type of generator grid-connected technology, in particular to a short-circuit test generator low-voltage self-synchronized grid-connected technology. It belongs to the technical field of generators. Background technique [0002] At present, in the traditional test, there are only four methods for generator grid connection test; automatic quasi-synchronous grid connection is the current mainstream grid connection method, and the computer detects the frequency, phase, phase sequence, voltage and grid frequency of the generators to be operated in parallel. When the phase, phase sequence, and voltage are the same, a circuit breaker closing command is issued. The generator is connected to the power grid without disturbance. [0003] Manual quasi-synchronous grid connection was the grid connection method before the 1990s. Manually observe the synchronization table, and when the frequency, phase, phase s...

Claims

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Application Information

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IPC IPC(8): H02J3/38
Inventor 胡醇佟力王林李杰周璇曹坚
Owner SUZHOU APP SCI ACAD CO LTD
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