摘要
低压柔性互联系统是实现配电网功率灵活调度、光伏消纳的重要设备。构建低成本、高效率、高功率密度的低压柔性互联变流拓扑是当前研究的热点。首先,研究一种改进型背靠背有源中点钳位型(active neutral-point clamped,ANPC)变换器,通过桥臂复用功率器件的方式,构建的柔性互联系统可降低所需开关器件数量;然后,针对该拓扑在运行时产生的暂态过电压问题,分析过电压产生的原因与运行条件,并提出对应的调制及控制方法,实现柔性互联系统离网、潮流控制等模式下的稳定运行。最后,搭建仿真平台验证控制策略的可行性,确定了其适用范围,为选用改进型背靠背ANPC变换器提供了参考。
The low voltage flexible interconnection system is a critical equipment for achieving flexible power dispatch and photovoltaic accommodation in distribution networks.Developing low-cost,high-efficiency,and high-power-density topologies for low voltage flexible interconnection systems is currently a key research focus.Firstly,this paper investigates an improved backto-back ANPC converter suitable for low voltage flexible interconnection systems.By reusing power devices across bridge arms,this topology reduces the required number of switching devices.Addressing the transient overvoltage issues during operation,the study analyzes the causes and operational conditions of overvoltage and proposes corresponding modulation and control methods to ensure stable operation in both islanded mode and power flow control mode.Furthermore,simulations are conducted to validate the feasibility of the control strategy and determine its applicable scope,serving as an alternative reference model for selecting improved back-to-back ANPC converters.
作者
高千帆
张永磊
季宇
邵瑶
隗雨萌
GAO Qianfan;ZHANG Yonglei;JI Yu;SHAO Yao;WEI Yumeng(China University of Mining and Technology,Xuzhou 221008,China;State Grid Shanghai Energy Interconnection Research Institute Co.,Ltd.,Shanghai 201210,China)
出处
《供用电》
北大核心
2026年第2期14-25,52,共13页
Distribution & Utilization
基金
国家重点研发计划项目(2023YFE0115900)
国家自然科学基金项目(52107218)。
关键词
有源中点钳位型逆变器
柔性互联
空间矢量调制
矢量作用时间
背靠背变换器
active neutral-point clamped(ANPC)converter
flexible interconnection
space vector pulse width modulation(SVPWM)
vector action time
back-to-back converter
