基于二极管整流器实现风电机组直流输出的方法  

Method for Realizing DC Output of Wind Turbine Based on Diode Rectifier

作　　者：杨明扬 杨志千 蔡旭[1] 艾斯卡尔[2] Seiki Igarashi 张建文[1] YANG Mingyang;YANG Zhiqian;CAI Xu;Aisikaer;Seiki Igarashi;ZHANG Jianwen(School of Electrical and Electronic Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Xinjiang Goldwind Science&Technology Co.,Ltd.,Beijing 100176,China;Fuji Electric Co.,Ltd.,Tokyo 141-0032,Japan)

机构地区：[1]上海交通大学电子信息与电气工程学院,上海200240 [2]新疆金风科技股份有限公司,北京100176 [3]富士电机有限公司,东京141-0032

出　　处：《高电压技术》2021年第8期2708-2719,共12页High Voltage Engineering

基　　金：国家自然科学基金(51677117);新疆金风科技股份有限公司委托研究项目(18H100000461);富士电机有限公司委托研究项目(20H100000219)。

摘　　要：未来海上风电场有望采用大型直流风电机组进行组网以降低电缆成本和损耗。为此,提出一种以二极管整流器作为中压并网端口,且具备储能端口与取电端口的多端口风电变流器拓扑,用其实现海上大型风电机组的直流化,其中,储能与取电端口用于实现机组自启动。直流并网端口无LC滤波装置,当发生直流短路故障时,由于无须采用电容器,则避免了对短路点的放电电流冲击。针对该系统方案,结合变流器数学模型,给出了包括启动、发电和故障穿越的机组级控制策略。详细推导分析了变换器关键元件的边界运行条件,并提出其主电路参数优化设计方法。在PSCAD中构建8.0MW直流风电机组仿真模型,仿真结果表明:变流器的全工况运行参数基本满足边界运行条件,启动并网过程平稳且无明显冲击,变流器能在100 ms左右清除直流短路故障电流,保护功率元件,并实现故障穿越。最后,利用基于RT-LAB实时仿真器和F28335控制器的半实物仿真平台,进一步验证了变流器启动与运行控制策略的有效性。In the future,offshore wind farms are expected to use DC output wind turbines for networking to reduce cable costs and losses.For this reason,a multi-port wind power converter,used for realizing the DC output of large offshore wind turbines,is proposed.The converter uses a diode rectifier as a medium-voltage grid-connected port,and an energy storage port and a power-taking port for realizing the self-starting of the wind turbine.Without an LC filter on the output side,no capacitor will cause a discharge current impact on the short-circuit point when a DC short-circuit fault occurs.The control strategies including start-up,power generation,and fault ride-through are given.Moreover,based on the analysis of the boundary conditions of the key components,the parameter optimization method of its main circuit is proposed.An 8.0 MW DC output wind turbine model is constructed in PSCAD,the simulation results show that the converter operating parameters basically meet the boundary conditions,the startup process is smooth and there is no obvious impact.The converter can clear the DC short-circuit fault current in about 100 ms,protect the power components,and achieve fault ride-through.Finally,the hardware-in-the-loop simulation platform based on RT-LAB real-time simulator and F28335 controller is used to further verify the effectiveness of the converter startup and operation control strategy.

关 键 词：直流风电机组 风电变流器 二极管整流器 多端口变换器 参数优化设计 故障穿越 

分 类 号：TM461[电气工程—电器] TM614