摘要
直流耗能装置是海上风电经柔直并网系统中的重要装备,用于受端电网故障时吸收风场馈入的盈余功率防止系统过压。该文针对模块化多电平换流器(modular multilevel converter,MMC)型和混合型两种工程主流耗能装置技术路线,提出一种通用的直流母线电压滞环控制策略,可显著降低耗能阀内部电容、电阻及绝缘栅双极晶体管(insulated-gate bipolar transistor,IGBT)的电气应力与选型规格参数,实现装备低成本和轻型化设计。建立融合耗能装置的柔直系统直流侧等效数学模型,揭示控制参数对系统暂态过电压和耗能装置热应力的影响机理,给出控制参数的详细设计方法。最后,搭建±250 kV/1 500 MW海上风电并网系统模型验证上述内容的正确性,仿真结果表明,所提控制策略具有良好系统特性,MMC型耗能装置无需额外配置37%的全桥子模块,电容值降低75%;混合型耗能装置内部电阻发热降低97.7%,不再需要水冷散热装置。
DC energy dissipation device is crucial in the offshore wind power plants connected through flexible high voltage direct current transmission systems.It is used to absorb the surplus power fed by the wind farms to prevent system from overvoltage when onshore grid encounters failures.A universal DC bus voltage hysteresis control strategy is proposed for the MMC-type and hybrid energy dissipation devices,which can significantly reduce the electrical and thermal stresses applied to the capacitors,resistors and IGBTs inside submodules,thus achieving a lower cost and lighter weight equipment design.An equivalent mathematical model of a flexible dc system integrating energy dissipation devices has been established,revealing the mechanism of the influence of control parameters on transient overvoltage and thermal stress of energy dissipation devices in the system.A detailed design method for control parameters is provided.Finally,a±250 kV/1500 MW offshore wind grid connected system model is built in the Matlab software environment to verify the correctness of the above content.The simulation results show that the proposed control strategy has good system characteristics,which can reduce the number of sub modules required for MMC type energy dissipation devices by 37%,reduce capacitance values by 75%,and reduce internal resistance heating of hybrid energy consumption devices by 97.7%,thereby removing the need for water cooling and heat dissipation.
作者
李云丰
许杰锋
许彬
张升
张佳琳
LI Yunfeng;XU Jiefeng;XU Bin;ZHANG Sheng;ZHANG Jialin(National Key Laboratory of Power Grid Disaster Prevention and Reduction(Changsha University of Science and Technology,School of Electrical&Information Engineering),Changsha 410114,Hunan Province,China;National Key Laboratory of Advanced Power Transmission Technology(State Grid Smart Grid Research Institute Co.,Ltd.),Changping District,Beijing 102200,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2024年第19期7751-7761,I0022,共12页
PROCEEDINGS OF THE CHINESE SOCIETY FOR ELECTRICAL ENGINEERING
基金
国家电网有限公司科技项目(5100-202158471A-0-5-ZN)。
关键词
直流耗能装置
海上风电
柔性直流输电
控制方式
DC chopper
offshore wind power
voltage source converter based high voltage direct current(VSC-HVDC)
control method
