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Black start alternating current excitation device of pumped storage variable speed unit and control method thereof

An AC excitation and pumped storage technology, applied in the control system, control generator, electrical components and other directions, can solve the problem of black start AC excitation equipment and its control technology is still blank and other problems

Active Publication Date: 2019-10-15
NR ELECTRIC CO LTD +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no application of variable speed units in China, and its black start AC excitation equipment and its control technology are still blank

Method used

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  • Black start alternating current excitation device of pumped storage variable speed unit and control method thereof
  • Black start alternating current excitation device of pumped storage variable speed unit and control method thereof
  • Black start alternating current excitation device of pumped storage variable speed unit and control method thereof

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Experimental program
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specific Embodiment

[0051] First, calculate the main equipment parameters according to the following method.

[0052] The parameters of the auxiliary AC power supply in the black start auxiliary power module are calculated and selected in this way:

[0053] (1) Rated voltage U GAN : Choose according to the common rating of the optional power supply, such as 400V;

[0054] (2) Rated capacity S GA Calculate according to the formula:

[0055]

[0056] In the formula, k is the pressure building coefficient, so that S GA Under the premise of satisfying the black start of the variable speed unit on the auxiliary AC power supply capacity requirements, the value of k is 0.2 to 0.3, and 0.2 is taken in this embodiment; fNO is the no-load rated excitation current of the variable speed motor; n N is the synchronous speed of the variable speed motor; n S When the black start excitation is performed for the auxiliary power module of the black start, the stable speed value of the variable speed unit, ...

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Abstract

The invention discloses a black start alternating current excitation device of a pumped storage variable speed unit. The black start alternating current excitation device comprises: a black start auxiliary power module comprising an auxiliary alternating current power supply, an alternating current power supply voltage transformation unit and a first rectification unit; a main excitation power module comprising a network side converter, a direct current link and a machine side converter; a pre-charging module comprising a second rectifying unit and a current limiting unit; and a black start alternating current excitation control module comprising a sensor unit, a control calculation unit and an output control unit. The device can meet the requirements of black start of the pumped storage variable speed unit on the alternating current excitation device and control thereof, and achieves the black start of the variable speed unit. The invention also provides a control method of the blackstart alternating current excitation device of the pumped storage variable speed unit.

Description

technical field [0001] The invention belongs to the technical field of pumped storage energy control, in particular to a black-start AC excitation device and a control method for a pumped storage variable speed unit. Background technique [0002] The generator motor of the pumped-storage variable-speed unit is a variable-speed motor, and a three-phase AC excitation current is passed through the three-phase distributed rotor pole coils to form a rotor rotating magnetic field. The three-phase AC excitation current used by the variable speed unit is provided by the AC excitation equipment, which is mostly a voltage source AC-DC-AC inverter. The relationship between the rotor magnetic field speed No and the rotor mechanical speed Nm is as follows: [0003] No=Nm+Ne [0004] In the formula, No----rotor magnetic field speed [0005] Nm---rotor mechanical speed [0006] Ne----The rotor magnetic field generated by AC excitation relative to the rotor speed is positive when it is ...

Claims

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Application Information

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IPC IPC(8): H02P9/08
CPCH02P9/08
Inventor 闫伟石祥建任格施一峰刘海涛刘为群吴龙吴涛谢欢钟高跃檀政潘仁秋李善颖周吉琦李长宇
Owner NR ELECTRIC CO LTD
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