Grid-forming Control Based on Adaptive Reactive Power Allocation for Offshore Wind Farms Connected to Diode-rectifier-based HVDC System  

作　　者：Ganghua Zhang Wang Xiang Xia Chen Rui Tu Xuebo Qiao Jinyu Wen 

机构地区：[1]School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China

出　　处：《Journal of Modern Power Systems and Clean Energy》2025年第1期154-166,共13页现代电力系统与清洁能源学报(英文)

基　　金：supported by the National Key Research and Development Program of China(No.2022YFB2405400);in part by the National Natural Science Foundation of China(No.52237004)。

摘　　要：Diode-rectifier-based high-voltage direct current(DR-HVDC)systems are considered an attractive solution for integrating offshore wind farms(OWFs).Grid-forming(GFM)control with a rational reactive power allocation capability is crucial for the safe operation of numerous wind turbines(WTs).Most typical GFM controls aim to share surplus reactive power of the system equally among WTs,easily rendering capacity overloads for WTs that are outputting high levels of active power.In this paper,a novel GFM control for OWFs is proposed,allowing for adaptively allocating the reactive power according to the actual active power output of WTs.Firstly,the reactive power characteristics of the AC collection networks and WTs are analyzed across a wide wind power range.Then,combining the positive correlation of WT active power with the output AC voltage,a Q-θtype GFM control for WTs is presented.The adaptive reactive power allocation mechanism and the parameter design of the Q-θbased reactive power controller are elucidated,ensuring that WTs with lower active power output contribute more reactive power to the system than WTs with higher active power output.The AC impedance models of WTs under various GFM controls are established to evaluate the impact of different reactive power controllers.Finally,the feasibility of the proposed control is validated in PSCAD/EMTDC,accompanied by stability analysis.

关 键 词：Offshore wind farm diode-rectifier high-voltage direct current(HVDC) grid-forming control reactive power allocation stability analysis 

分 类 号：TM614[电气工程—电力系统及自动化]