柔性互联装备中零序电压注入的相间功率均衡控制
Phase-to-phase power balance control in flexible interconnection equipment by injecting zero sequence voltage
王波 1季子越 1汪万兴 2肖朝民 2张岩2
作者信息
- 1. 国网西安供电公司,陕西西安 710048
- 2. 西安交通大学电气工程学院,陕西西安 710049
- 折叠
摘要
级联全桥加双有源桥结构的多端柔性互联装备可连接交流电网与多个直流电网,直流电网瞬时功率差异、子模块故障等问题均会导致并网电流不均衡与直流电容电压不均分.针对三相星型互联结构,采用注入零序电压的控制策略均衡相间功率,推导出不同功率需求下零序电压分量具体表达式,并量化分析注入零序电压的限制范围.最后搭建仿真实验平台,验证了该方法的有效性,仿真结果表明:在现有控制架构的基础上加入零序电压注入环节能够调配相间的功率以保证并网电流均衡,将不平衡度从6％降为1％,同时维持直流电容电压均分.
Abstract
The multi terminal flexible interconnection equipment with cascaded full bridge and dual active bridge structure could connect AC power grid and multiple DC power grid,and instan-taneous power differences in different DC power grids and sub module faults could lead to unbal-ance grid current and DC capacitor voltage distribution.For the three-phase star interconnection structure,this paper adopted the control strategy of injecting zero sequence voltage to meet the different power requirements,derived the specific zero sequence voltage component expression,and quantitatively analyzed the limitation range of injected zero sequence voltage.Finally,a simu-lation experimental platform was built to verify the effectiveness of the method.The simulation results indicated that injecting zero sequence voltage on the basis of the normal control architec-ture can allocate the power between phases to ensure grid current balance,reduce imbalance from 6％ to 1％,and maintain the even distribution of DC capacitor voltage.
关键词
中压配电网/多端柔性互联装备/电流均衡控制/直流电容电压平衡控制/零序电压Key words
medium voltage distribution network/multi-terminal flexible interconnection equip-ment/current balance control/DC capacitor voltage balance control/zero sequence voltage引用本文复制引用
基金项目
国家电网陕西省科技计划(SGSNXA00SNJS2312584)
出版年
2024
国家科技期刊平台
NSTL
维普
万方数据