Overvoltage protective device and overvoltage protective method applicable to wind power hydrogen production and energy storage system grid connection

Abstract

The invention provides an overvoltage protective device and an overvoltage protective method applicable to wind power hydrogen production and energy storage system grid connection. The overvoltage protective device comprises a detecting and processing unit, a multistage serial conversion unit, a grid-connected inverter unit, a stored hydrogen energy conversion unit, a wind power converter and an overvoltage protective unit. The overvoltage protective method includes collecting voltage on a direct-current side of the wind power converter through the wind power detection unit, controlling a connection sequence of IGBTs of the multistage serial conversion unit through an IR drive unit, and generating power and conducting grid connection by the stored hydrogen energy conversion unit; sending acontrol signal through a microprocessor unit, blocking input signals of a voltage detection unit, connecting IGBTs of the overvoltage protective unit, connecting the stored hydrogen energy conversionunit into the overvoltage protective unit, and switching off the IGBTs of the multistage serial conversion unit. The overvoltage protective device and the overvoltage protective method have the advantages that voltage change on the direct-current side of the converter can be detected in real time and effective overvoltage protection of the direct-current side of the converter can be achieved through stored hydrogen energy, so that an intelligent protection function is achieved.

Description

technical field [0001] The invention belongs to the technical field of power system control, and in particular relates to an overvoltage protection device and method suitable for grid connection of a wind power hydrogen production energy storage system. Background technique [0002] With the prominence of environmental problems and the intensification of energy crisis, wind power technology has been developed by leaps and bounds. Due to the indirectness, instability and irregularity of wind power resources, the quality of power generated by wind power will be poor, and its high penetration rate will have a greater impact on the power grid. In view of the "abandoned wind" and unfriendly power quality and safety issues in the grid, the use of wind power hydrogen production and energy storage can effectively adjust the problem of wind power grid connection. For the direct-drive wind power system, when the grid voltage drops, the grid-side converter will increase the output cur...

AI Technical Summary

Problems solved by technology

Due to the indirectness, instability and irregularity of wind power resources, the quality of power generated by wind power will be poor, and its high penetration rate will have a greater impact on the power grid. In view of the "abandoned wind" and unfriendly power quality and safety problems in the grid, the use of wind power hydrogen production and energy storage can effectively adjust the problem of wind power grid connection

For the direct-drive wind power system, when the grid voltage drops, the grid-side converter will increase the output current in order to keep the output power constant. When the current reaches the current limit value, the output power is limited. At this time, the wind turbine and The generator keeps running normally, and the converter on the generator side keeps its control unchanged, so the input power of the DC side is greater than the output power, and the adjustment measures such as pitch change usually respond slowly, resulting in an unbalanced input and output power of the converter, resulting in DC The side voltage rises, which also threatens the safety of semiconductor converter devices

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