学术论文

      考虑灵活控制策略及电流限幅的逆变型分布式电源故障模型

      Fault Model of Inverter-Based Distributed Generator Considering Flexible Control Strategy and Current Limitation

      摘要:
      随着分布式电源(distributed generator,DG)的大规模接入以及并网规约对DG低电压穿越能力的要求,分析DG对故障电网的影响成为一个十分重要的问题.为了得到采用恒功率控制模式的逆变型 DG 在电网故障条件下的故障模型,首先对DG的控制原理进行了简要分析,然后根据瞬时功率理论和DG输出电流的基本约束推导出DG的通用电流参考信号表达式,调节其中的参数即可实现灵活的控制策略,同时保持DG瞬时功率的平均值对功率参考值的跟踪.在通用电流参考信号表达式的基础上,文章进一步提出了在DG 电流限幅条件下功率参考值的计算方法,最后通过Simulink仿真验证了所提出的DG故障模型和限流算法的正确性.
      Abstract:
      With the large-scale connections of distributed generator (DG) into grid and the requirement of low voltage ride-through ability for DG, it is quite an important issue to analyze the influences of DG on a faulted grid. This paper focused on the fault model of a PQ-control mode inverter-based DG. Based on the instantaneous power theory and two basic constraints of DG output current, the generalized current reference expression of DG can be derived, it guarantee that DG's average output power always keep track of power references. Adjusting parameters of that expression result in flexible control strategies, meanwhile. Moreover, this paper proposed the computational method of DG's power references with the current limiting constriction. Finally, the DG fault response model and current limiting algorithm was verified to be correct by Simulink simulations.
      作者: 郭文明 牟龙华
      Author: GUO Wenming MU Longhua
      作者单位: 同济大学电气工程系,上海市嘉定区,201804
      刊 名: 中国电机工程学报 ISTICEIPKU
      年,卷(期): 2015, 35(24)
      分类号: TM711
      在线出版日期: 2016年2月25日
      基金项目: 国家自然科学基金项目,浙江省重大科技专项(2013C01063). Project Supported by National Natural Science Foundation of China,Major science and technology projects in Zhejiang Province