Method for improving high and low voltage ride-through capability of auxiliary engine frequency converter of thermal power generation unit

A technology of high and low voltage ride through and low voltage ride through, which is applied in the low voltage ride through capability and improves the high performance of thermal power unit auxiliary frequency converters, and can solve problems such as expensive equipment, hazards to the safe and stable operation of power grids and generator sets, and frequent failures

Inactive Publication Date: 2018-03-27
LIAONING DONGKE ELECTRIC POWER
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Problems solved by technology

This solves the technical problems existing in the prior art, such as frequent failures, expensive equipment, complex and cumbersome algorithms, and serious harm to the safe and stable operation of the power grid and generating units.

Method used

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  • Method for improving high and low voltage ride-through capability of auxiliary engine frequency converter of thermal power generation unit
  • Method for improving high and low voltage ride-through capability of auxiliary engine frequency converter of thermal power generation unit
  • Method for improving high and low voltage ride-through capability of auxiliary engine frequency converter of thermal power generation unit

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Embodiment Construction

[0019] A method for improving the high and low voltage ride-through capability of a thermal power unit auxiliary frequency converter, characterized in that:

[0020] 1) Low-voltage ride-through method: When the voltage of the power supply line drops, provide DC power support to the inverter in the frequency converter through the low-voltage ride-through capacitor, specifically:

[0021] Equipped with a low-voltage ride-through capacitor on the DC side of the inverter, the terminal voltage of the low-voltage ride-through capacitor is lower than the DC voltage value of the inverter, and a reverse diode is connected in series between the DC side of the inverter and the low-voltage ride-through capacitor; When falling, the low-voltage ride-through capacitor uses the freewheeling diode as a channel to provide DC energy to the inverter, so that the inverter can maintain stable operation within a certain period of time;

[0022] 2) High-voltage ride-through method: When the AC voltag...

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Abstract

A method for improving the high-low voltage ride-through capability of a thermal power unit auxiliary frequency converter includes: a low-voltage ride-through method: when the voltage of a power supply line drops, a DC power supply is provided to an inverter in the frequency converter through a low-voltage ride-through capacitor. High-voltage ride-through method: When the AC voltage of the inverter's incoming line rises rapidly above the rated voltage level, the voltage is limited by means of energy-consuming chopping. Therefore, the technical problems existing in the prior art, such as frequent faults, expensive equipment, complex and cumbersome algorithms, and serious harm to the safe and stable operation of the power grid and the generator set, are solved. The method of the invention has simple control loop and rapid response, and improves the safe and stable operation level of thermal power plants and power grids.

Description

technical field [0001] The invention belongs to the field of high-voltage ride-through and low-voltage ride-through capability testing in high-power power electronics technology, and particularly relates to a technical method for improving the high- and low-voltage ride-through capabilities of a thermal power unit auxiliary machine inverter. Background technique [0002] Generally, short circuits or other faults often occur in large power grids, causing sudden rises and drops in system voltage. If the fault point occurs near the key components of large thermal power plants of 300MW and above, such as the auxiliary frequency converter of thermal power units, it may It leads to the tripping of the frequency converter of the auxiliary machine, which further leads to the shutdown of the furnace and the off-grid event of the generator set, causing another impact on the power grid under fault, deteriorating the safety and stability of the power system, and bringing great impact to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/38
Inventor 黄未王刚张涛张强邵宝珠王超李鹏里宋保泉王英明田丰源周家旭李伟
Owner LIAONING DONGKE ELECTRIC POWER
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