基于线性自抗扰的微电网平滑切换控制策略

发布时间：2018-06-23 05:15

本文选题：微电网 + 平滑切换　；参考：《电网技术》2017年12期

【摘要】：实现微电网并网/孤岛运行模式平滑切换是保证微电网安全可靠运行的前提。提出了基于线性自抗扰控制(linear active disturbance rejection control,LADRC)技术的微电网运行模式平滑切换控制策略。以主从结构的微电网为研究对象,将主控单元电压外环控制器设计为LADRC控制器,采用扩张状态观测器(extended state observer,ESO)对扩张状态(未知过程扰动、系统未建模摄动及dq轴通道耦合)进行在线实时估计,并将扰动估计主动补偿于主控单元的电流内环设定值中,从而达到快速消除扰动、平缓切换过程的效果。推导出一阶LADRC及主控系统的传递函数并进行幅频分析,结果表明所提方案具有良好的设定值跟踪性能和扰动抑制性能。动态仿真结果表明,所提控制策略能够有效平滑微网由并网切换至孤网模式产生的暂态振荡,同时对从控部分的扰动具有较好的鲁棒性,并且算法简单、调试容易。
[Abstract]:It is a prerequisite for the safe and reliable operation of microgrid to realize smooth switching of grid / island operation mode. A smooth switching control strategy based on linear active disturbance rejection control (linear active disturbance rejection control LADRC) for microgrid operation mode is proposed. Taking the microgrid with master-slave structure as the research object, the main control unit voltage outer loop controller is designed as the LADRC controller, and the extended state observer (extended state observer is used to disturb the extended state (unknown process). The system is unmodeled perturbation and dq-axis coupling) and on-line real-time estimation is carried out, and the disturbance estimation is actively compensated to the set value of the current inner loop of the main control unit, so that the disturbance can be eliminated quickly and the switching process can be smoothed. The transfer function of the first order LADRC and the main control system is derived and the amplitude-frequency analysis is carried out. The results show that the proposed scheme has good performance of setting value tracking and disturbance suppression. The dynamic simulation results show that the proposed control strategy can effectively smooth the transient oscillation of the microgrid switching from grid-connected mode to the isolated mode, and it is robust to the disturbance of the slave control part, and the algorithm is simple and the debugging is easy.
【作者单位】：国网江苏省电力公司电力科学研究院;东南大学电气工程学院;
【基金】：国家自然科学基金(51477029) 国家重点研发计划项目(2016YFB0900400)~~
【分类号】：TM727

【相似文献】