基于改进型参考滤波电感电流的微电网限流策略

发布时间：2018-03-22 05:03

本文选题：下垂控制　切入点：微电网　出处：《电网技术》2017年08期 　论文类型：期刊论文

【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。
[Abstract]:In order to solve the problem that traditional current limiting strategy can not adapt to different short-circuit fault types, a current limiting strategy based on improved reference filter inductor current is proposed. Firstly, distributed generation unit (DG) with droop control is studied. The relationship between DG output current and output voltage of reference filter current is derived, and the theoretical derivation shows that adjusting filter capacitance and control system parameters can make DG output current effectively track reference filter inductor current. When the effective value of a phase current in the output current of DG is greater than a given threshold, the current limit is obtained by changing the reference filter inductor current. Finally, the feasibility and effectiveness of the proposed strategy are verified by simulation experiments. The simulation results show that the proposed strategy is feasible and effective. The proposed current limiting strategy can limit the maximum phase current of the DG output current to a given value, and is not affected by the type of short-circuit fault, fault resistance and fault time.
【作者单位】：上海电力学院自动化工程学院;西安交通大学电气工程学院;
【基金】：国家自然科学基金(61573239,61403127) 上海市重点科技攻关计划(14110500700)~~
【分类号】：TM727

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