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

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...

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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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