用于海上风电的DRU-MMC混合换流器控制策略和容量选取  

Control Strategy and Capacity Selection of DRU-MMC Hybrid Converters for Offshore Wind Power

作　　者：甘慧辰 肖晃庆 黄莹[3] GAN Huichen;XIAO Huangqing;HUANG Ying(School of Electric Power,South China University of Technology,Guangzhou 510640,China;Guangdong Key Laboratory of Clean Energy Technology(South China University of Technology),Guangzhou 510640,China;College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]华南理工大学电力学院,广东省广州市510640 [2]广东省绿色能源技术重点实验室(华南理工大学),广东省广州市510640 [3]浙江大学电气工程学院,浙江省杭州市310027

出　　处：《电力系统自动化》2024年第21期28-37,共10页Automation of Electric Power Systems

基　　金：中央高校基本科研业务费专项资金资助项目(2022ZYGXZR050);广东省重点领域研发计划项目资助(2021B0101230001)。

摘　　要：在众多海上风电送出方案中,基于二极管整流单元(DRU)和模块化多电平换流器(MMC)并联的方案具有显著的经济效益,受到了广泛关注。相比于纯柔性直流送出方案,DRU-MMC并联送出方案的海上换流平台具有更小的体积、重量和成本。在此方案中,DRU传输绝大部分功率,小容量MMC则提供风机启动所需功率、电压和频率支撑以及补偿由DRU引入的谐波电流。针对DRU-MMC并联送出拓扑,提出有功功率分配策略和谐波补偿策略,使功率在DRU和MMC之间合理分配。在MMC主要功能实现的前提下,分析了MMC最小容量的选取。从投资和运营两个方面,对比了MMC和DRU-MMC并联两种送出方案海上换流平台的成本差异。最后,在PSCAD/EMTDC平台上进行了仿真,验证了所述策略的有效性。Among numerous offshore wind power transmission schemes,the scheme based on parallel connection of diode rectifier unit(DRU)and modular multilevel converter(MMC)has significant economic benefits,which has gained widespread attention.Compared to flexible DC transmission scheme,the DRU-MMC parallel transmission scheme has smaller volume,lighter weight,and less cost of the offshore converter platform.In this scheme,the DRU transmits most of the power,while the small-capacity MMC provides the power required for the wind turbine start-up,supports voltage and frequency and compensates for harmonic currents introduced by the DRU.An active power distribution strategy and a harmonic compensation strategy are proposed for the DRU-MMC parallel transmission topology,so that the power is reasonably distributed between DRU and MMC.Under the premise of realizing main functions of the MMC,the selection of the minimum capacity of MMC is analyzed.From two aspects of investment and operation,the cost of the offshore converter platform of MMC and DRU-MMC is compared.Finally,simulations are carried out on PSCAD/EMTDC platform to verify the effectiveness of the proposed strategy.

关 键 词：海上风电 二极管整流单元 混合直流 模块化多电平换流器 协调控制 谐波补偿 

分 类 号：TM721.1[电气工程—电力系统及自动化]