High-frequency oscillation suppression method and device for new energy storage system

An energy storage system, high-frequency oscillation technology, applied in circuit devices, reducing/preventing power oscillation, power transmission AC network, etc., can solve problems such as poor suppression effect, achieve high-frequency oscillation suppression, good suppression effect, and improve the system The effect of running stability
CN112803436APending Publication Date: 2021-05-14STATE GRID QINGHAI ELECTRIC POWER +2
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
STATE GRID QINGHAI ELECTRIC POWER
Publication Date
2021-05-14

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Abstract

The invention provides a high-frequency oscillation suppression method and device for a new energy storage system. The method comprises the following steps: acquiring a grid-connected point AC voltage of the new energy storage system in a VSC-HVDC system and an output current of the VSC-HVDC system; determining a modulation voltage of a sending end converter station in the VSC-HVDC system; and suppressing high-frequency oscillation of the new energy storage system. The function of the line between the sending end converter station and the new energy storage system is considered, the situation that the phase difference between the impedance of the WFVSC and the impedance of the new energy storage system is too large is avoided, the high-frequency oscillation of the new energy storage system is suppressed to the maximum extent, the suppression effect is good, and the system operation stability when the new energy storage system is connected to the main network through the VSC-HVDC can be obviously improved. High-frequency oscillation suppression of the new energy storage system is realized on the basis of the modulation voltage of the sending-end converter station, the method and the device are irrelevant to a specific modulation mode, adjustment is more flexible, and the method and the device are suitable for high-frequency oscillation suppression of the new energy storage system in a VSC-HVDC system including SVM and SPWM.
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Description

technical field

[0001] The invention relates to the field of new energy technology, in particular to a high-frequency oscillation suppression method and device for a new energy storage system. Background technique

[0002] With the increasingly serious problems of energy shortage and carbon emissions, new energy power generation systems have been widely used. Compared with the high loss of traditional wind power AC grid-connected and the low flexibility of traditional wind power DC grid-connected, grid-connected high-voltage direct current transmission (Voltage Source Converter High Voltage Direct Current, VSC-HVDC) system with voltage source converter is a It is currently considered the most effective means to solve large-scale renewable energy collection and grid connection. When the VSC-HVDC system is connected to the energy storage power station in the new energy power generation system, the sending-end converter station is in the voltage control mode to provide AC volt...

Claims

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