基于改进型参考滤波电感电流的微电网限流策略  

Current-Limiting Strategy in Microgrids Based on Improved Filtering Inductance Reference Current

作　　者：高杰[1] 程启明[1] 谭冯忍 王晓卫[2] 余德清[1] 张宇[1] 

机构地区：[1]上海电力学院自动化工程学院,上海市杨浦区200090 [2]西安交通大学电气工程学院,陕西省西安市710049

出　　处：《电网技术》2017年第8期2672-2679,共8页Power System Technology

基　　金：国家自然科学基金(61573239;61403127);上海市重点科技攻关计划(14110500700)~~

摘　　要：为解决传统的限流策略不能适应不同短路故障类型的问题,提出一种基于改进型参考滤波电感电流的限流策略。首先,以下垂控制的分布式发电单元(distributed generation,DG)为研究对象,推导出了参考滤波电流、DG输出电流及输出电压之间的关系式;理论推导表明,调整滤波电容和控制系统参数,能使DG输出电流有效地跟踪参考滤波电感电流。然后,当DG输出电流中的某一相电流的有效值大于给定阈值时,通过改变参考滤波电感电流来进行限流。最后,仿真实验验证了所提策略的可行性和有效性。仿真结果表明,所提限流策略可将DG输出电流的最大相电流限制在给定值内,且不受短路故障类型、故障电阻和故障时刻等因素影响。In order to overcome disadvantage of traditional current-limiting strategy, unable to adapt to different short-circuit types, this paper presents a current-limiting strategy based on improved filtering inttuctance reference current （FIRC）. Firstly, distributed generation （DG） with droop control is selected for investigation. Relationship among DG output current and voltage and FIRC is discussed. Theoretical derivation demonstrates that DG output current can follow FIRC by adjusting parameters of control system and filtering capacitance. Next, when fault is detected, current-limiting strategy is implemented by setting FIRC value. Finally, experiments prove that the proposed strategy can limit maximum phase current to a given value. The proposed method is immune to short circuit fault type, fault resistance and fault distance.

关 键 词：下垂控制 微电网 限流策略 滤波电感电流 滤波电容 

分 类 号：TM721[电气工程—电力系统及自动化]