Variable Inertia Coordinated Control Strategy for Offshore Wind Power Flexible DC System

Yuxin HUANG; Shijie NI; Ping ZHAO; Zhenxing LI

doi:10.16513/j.2096-2185.DE.2207601

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Distributed Energy ›› 2022, Vol. 7 ›› Issue (6) : 1-10. DOI: 10.16513/j.2096-2185.DE.2207601

Basic Research

Variable Inertia Coordinated Control Strategy for Offshore Wind Power Flexible DC System

Yuxin HUANG ¹ ,
Shijie NI ¹ ,
Ping ZHAO ¹^,² ,
Zhenxing LI ¹^,²

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Abstract

In order to solve the problem of decreasing system inertia and increasing frequency instability risk caused by large capacity offshore wind power connected to the power grid, a variable inertia coordinated control method is proposed. In the coordinated control strategy, the grid side converter adopts the virtual inertia control basis, and changes its inertia coefficient according to the DC voltage, so as to more effectively use the DC capacitor for inertia support. The windfarm side converter changes the frequency of the offshore power grid according to the change of the DC voltage, and transmits the change of the onshore frequency to the offshore wind farm. The wind turbine unit adjusts the inertia coefficient according to the change rate of the frequency and its own speed, so as to provide more inertia support power and reduce the decrease of the output power during the recovery phase of the wind turbine speed. The simulation results show that the proposed coordinated control strategy can effectively enhance the inertia of the land system and improve the frequency stability of the system.

Key words

offshore wind farm / flexible DC transmission / virtual inertia / frequency response / coordinated control

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Yuxin HUANG , Shijie NI , Ping ZHAO , et al. Variable Inertia Coordinated Control Strategy for Offshore Wind Power Flexible DC System[J]. Distributed Energy Resources. 2022, 7(6): 1-10 https://doi.org/10.16513/j.2096-2185.DE.2207601

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