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Low-voltage ride-through method and device for feed pump turbine power generation system

A feedwater pump steam turbine and low voltage ride-through technology, applied in the control system, control generator, machine/engine, etc., can solve unfavorable power system stable operation and fault recovery, reduce the reliability of power generation mode, low voltage fault of power generation system, etc. problems, to achieve the effect of avoiding the rapid rise of speed, rapid dynamic response and improving robustness

Active Publication Date: 2020-08-14
CHINA POWER ENG CONSULTING GRP CORP EAST CHINA ELECTRIC POWER DESIGN INST +1
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Problems solved by technology

[0003] However, due to the power level limitation of the converter, the reliability of the power generation method is reduced, and the power generation system will face low-voltage faults. For example, if a low-voltage fault occurs in the grid, the output current of the converter or the voltage Exceeding the limit will trigger overvoltage and overcurrent protection, causing the power generation system to go off-grid, which is not conducive to the stable operation and fault recovery of the power system

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  • Low-voltage ride-through method and device for feed pump turbine power generation system
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  • Low-voltage ride-through method and device for feed pump turbine power generation system

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Embodiment Construction

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0027] In one embodiment of the present invention, as figure 1 As shown, the feedwater pump steam turbine power generation system includes a feedwater pump, a steam turbine, and a generator. The feedwater pump can be connected to the generator through the steam turbine, and the generator can be connected to the first converter, namely VSR. Inverter, that is, VSI is connected to the grid, and the feedwater pump, steam turbine and generator are coaxially connect...

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Abstract

The invention discloses a low-voltage ride-through method and device for a feed pump turbine power generation system. The low-voltage ride-through method comprises the following steps: detecting the voltage and current of a power grid; judging whether the power grid voltage and the power grid current exceed corresponding threshold values or not; and if the power grid voltage and the power grid current both exceed the corresponding threshold values, switching a direct-current voltage control outer ring of the power generation system to a first converter, and meanwhile, switching rotating speedcontrol outer rings of a water feeding pump, a steam turbine and a power generator to an air inlet valve of the steam turbine to realize low-voltage ride-through of the power generation system. According to the invention, the input active power can be rapidly reduced when the power grid has a low-voltage fault and the grid-connected power is reduced, so that the rotating speed of the power generation system is stabilized, the converter is prevented from being damaged by excess power or the rotating speed is prevented from rising, the robustness of the power generation system can be improved, the adjustment mode is simple, and the dynamic response of the control process is rapid.

Description

technical field [0001] The invention relates to the technical field of low-voltage ride-through, in particular to a low-voltage ride-through method of a feedwater pump steam turbine power generation system and a low-voltage ride-through device of a feedwater pump steam turbine power generation system. Background technique [0002] In the current thermal power generation, the boiler feed water pump is the most important factory energy-consuming equipment. While supplying water to the boiler, it has the function of connecting the remaining power to the grid for power generation. A new energy generation method. [0003] However, due to the power level limitation of the converter, the reliability of the power generation method is reduced, and the power generation system will face low-voltage faults. For example, if a low-voltage fault occurs in the grid, the output current of the converter or the voltage Exceeding the limit will trigger overvoltage and overcurrent protection, c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/48H02J3/24H02P9/04F01D15/10F01D17/10
CPCH02J3/48H02J3/24H02P9/04F01D15/10F01D17/10
Inventor 徐剑戚宏勋缪震昆张建文谭杰元晁刚杜光旭刘斌亮濮珊徐若琦
Owner CHINA POWER ENG CONSULTING GRP CORP EAST CHINA ELECTRIC POWER DESIGN INST
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