经DRU-HVDC送出的海上风电场汇集网电气调节特性分析及集群构网控制策略  

Analysis of Electrical Regulation Characteristics and Group Grid-forming Control Strategy of DRU-HVDC Integrated Offshore Wind Farm

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作  者:于浩天 蔡旭[1] 杨仁炘 杨明扬 汤广福 YU Haotian;CAI Xu;YANG Renxin;YANG Mingyang;TANG Guangfu(Key Laboratory of Control of Power Transmission and Conversion(Shanghai Jiao Tong University),Ministry of Education,Minhang District,Shanghai 200240,China;Beijing Huairou Laboratory,Huairou District,Beijing 101499,China)

机构地区:[1]电力传输与功率变换控制教育部重点实验室(上海交通大学),上海市闵行区200240 [2]北京怀柔实验室,北京市怀柔区101499

出  处:《中国电机工程学报》2025年第6期2318-2334,I0024,共18页PROCEEDINGS OF THE CHINESE SOCIETY FOR ELECTRICAL ENGINEERING

基  金:国家自然科学基金项目(52107201)。

摘  要:基于构网型风电场与二极管不控整流单元(diode rectifier unit,DRU)的低成本直流送出方案是目前大规模远海风电开发的热点问题。风电机组的构网控制策略是该送出方案的关键,针对现有风机构网策略控制率设计原理不完善、控制结构改造难度大、缺乏同步机理分析等问题,提出使用电压/功率因数节点来刻画DRU的基频功率特性,并利用BP-神经网络实现考虑换流特性及多重化后的DRU节点特性拟合。在此基础上,通过节点-潮流关系揭示风电汇集网络的等效负荷特性、电压/频率构建机理和对风电机组控制率设计的要求。进而提出一种基于锁相环与频率-无功下垂实现自同步的机组网侧变换器集群构网控制策略,完善下垂增益的设计和机组间的同步机理,并采用阻抗法分析验证所提控制策略在系统不同工况的宽频交互稳定性。最后,通过PSCAD/EMTDC仿真验证分析建模的准确性和构网控制策略的有效性。The low-cost high voltage direct current(HVDC)transmission scheme based on diode rectifier unit(DRU)and grid-forming(GFM)offshore wind farms(OWFs)is a hot topic in the development of large-scale distant offshore wind power.The GFM control strategy of wind turbines is the critical point of this scheme.However,there are still challenges,including the incomplete control law design mechanism,the difficulties in modifying the control structure,and the lack of synchronization mechanism analysis.To solve these problems,the voltage/power factor(U/PF)node model is proposed in this paper to describe the fundamental-frequency power characteristics of the DRU,and the backpropagation(BP)neural network method is utilized to fit the commutation process and multi-pulse topology features.Based on the equivalent load characteristics of the offshore AC system,the mechanism for the voltage/frequency formation,and the control law design requirements of wind turbines are revealed through the node-power flow relation.Furthermore,a clustered GFM control strategy is proposed for grid-side converters of offshore wind turbines based on phase-locked loop(PLL)and frequency-reactive power droop to realize self-synchronization.The design of frequency-reactive droop gain and synchronization mechanism is also elaborated.The wideband interactive stability of the system with the proposed GFM strategy under different operating conditions is analyzed using the impedance method.Finally,simulations are conducted in PSCAD/EMTDC to validate the accuracy of the modeling and analysis,and the effectiveness of the proposed GFM control strategy.

关 键 词:海上风电 二极管不控整流单元 电压/功率因数节点 构网控制 宽频交互稳定性 

分 类 号:TM614[电气工程—电力系统及自动化]

 

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