Testing method of low-voltage ride through capability of fossil power plant auxiliary engine

A low-voltage ride-through and thermal power unit technology, applied in the field of measurement, can solve the problems of short-term voltage drop, shutdown, shutdown, etc. of the power grid, achieve high economic value, and ensure safe and stable operation

Active Publication Date: 2014-05-28
STATE GRID HEBEI ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, there have been many lightning strikes, short-circuiting of electrical equipment, and grounding faults in thermal power plants, which have caused short-term voltage drops in power grids and power plants, resulting in low power and control power supplies for water pumps, pulverizers, blowers, and coal mills. voltage, some auxiliary machines have low-voltage blocking protection actions, causing the auxiliary machines to stop working, resulting in furnace shutdown and shutdown accidents

Method used

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  • Testing method of low-voltage ride through capability of fossil power plant auxiliary engine
  • Testing method of low-voltage ride through capability of fossil power plant auxiliary engine

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Experimental program
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Effect test

Embodiment 1

[0020] Hebei Huadian Luhua Thermal Power Co., Ltd. No. 1 unit, the generator model is QFSN-330-2, and the excitation regulator is UNITROL5000 produced by Swiss ABB company. Using the test method of the present invention, reasonably arrange the operation mode of the unit, and carry out the low-voltage ride-through test on the No. 1 powder feeder, see the attached figure 2 , which is the wave curve recorded by the WFLC portable power recorder and analyzer. From the figure, it can be seen that the No. 1 powder feeder can run stably for more than 9 seconds at 30% of the rated voltage, so it can be judged that the auxiliary machine has low voltage ride-through capability. Therefore, it can be seen that the test method of the present invention can accurately verify the auxiliary equipment with low voltage ride-through capability.

Embodiment 2

[0022] Unit 12 of Hebei Handan Thermal Power Plant, the generator model is QFSN-330-2, and the excitation regulator model is RCS9400. Adopting the test method of the present invention, reasonably arranging the operation mode of the unit, and conducting a low-voltage ride-through test on the No. 1 feed water pump, the test proved that the No. 1 feed water pump tripped after running at 30% of the rated voltage for 2 seconds, thus judging that the auxiliary machine does not have low voltage Voltage ride through capability. Therefore, the test method of the present invention can accurately verify auxiliary equipment that does not have low voltage ride-through capability.

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Abstract

The invention discloses a testing method of the low-voltage ride through capability of a fossil power plant auxiliary engine. The method is used for testing the low-voltage ride through capability of the fossil power plant auxiliary engine based on the excitation control of an excitation regulator. By reasonably arranging the operation mode of the plant, the method can be used for detecting whether the auxiliary engine can stay for more than 9 seconds through the 70% phase-step test of a generator excitation regulator so as to verify whether the auxiliary engine has the low-voltage ride through capability. The method provided by the invention can be used for rapidly detecting the low-voltage ride through capability of the fossil power plant auxiliary engine and deciding a corresponding improvement scheme according to the detecting result and has important significance for guaranteeing the safe and stable operation of the plant and a power grid.

Description

technical field [0001] The invention belongs to the field of measurement technology, and in particular relates to an excitation control-based test method for the low-voltage ride-through capability of thermal power unit auxiliary machines, which is used for testing the low-voltage ride-through capacity of thermal power unit auxiliary machines. Background technique [0002] Low-voltage ride-through capability originally refers to the ability of a small power generation system to maintain grid-connection when the voltage drops at the grid-connection point, and even provide a certain amount of reactive power to the grid to support the recovery of the grid until the grid returns to normal, thereby "riding" the ability of this low-voltage time. In recent years, there have been many lightning strikes, short-circuiting of electrical equipment, and grounding faults in thermal power plants, which have caused short-term voltage drops in power grids and power plants, resulting in low po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/34
Inventor 孟凡超郝晓光周文
Owner STATE GRID HEBEI ELECTRIC POWER RES INST
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