基于同步逆变器的微电网二次调频策略及特性分析
发布时间：2018-10-11 07:13
【摘要】：同步逆变器技术在分布式电源并网及微电网的应用得到广泛关注。针对基于多台同步逆变器并列运行的微电网,对等下垂控制策略适用于一次调频控制,当负荷突增或发电功率突降造成微电网总体功率不足进而频率越限时,需要采用二次调频控制,重新确定系统的有功功率 频率平衡点。文章提出了无需通信系统的3种二次调频策略,通过调节可调逆变器的下垂控制曲线,实现在线自动二次调频控制。分别针对3种策略,提出定值在线整定方法,比较了最大定值对最大输出功率的灵敏度及调频动态性能,在此基础上分析了微电网的有功功率 频率特性。最后,用Matlab/Simulink仿真平台搭建包含4台同步逆变器、3个负载的微电网仿真模型,验证了所提策略的有效性。
[Abstract]:The application of synchronous inverter technology in grid-connected distributed generation and microgrid has been paid more and more attention. For microgrid based on parallel operation of multiple synchronous inverters, the peer-to-peer droop control strategy is suitable for primary frequency modulation control. When the total power of microgrid is insufficient and the frequency exceeds the limit due to sudden increase of load or sudden drop of generating power, It is necessary to re-determine the active power and frequency balance point of the system by using the secondary frequency modulation control. In this paper, three secondary frequency modulation strategies without communication system are proposed. By adjusting the droop control curve of adjustable inverter, on-line automatic secondary frequency modulation control is realized. According to the three strategies, the on-line tuning method of fixed value is put forward, and the sensitivity of maximum fixed value to the maximum output power and the dynamic performance of frequency modulation are compared. On this basis, the active power and frequency characteristics of microgrid are analyzed. Finally, the simulation model of microgrid with four synchronous inverters and three loads is built on the Matlab/Simulink simulation platform, which verifies the effectiveness of the proposed strategy.
【作者单位】： 中国电力科学研究院;伊利诺伊理工学院;湖南大学电气与信息工程学院;
【分类号】：TM71
本文编号：2263318
[Abstract]:The application of synchronous inverter technology in grid-connected distributed generation and microgrid has been paid more and more attention. For microgrid based on parallel operation of multiple synchronous inverters, the peer-to-peer droop control strategy is suitable for primary frequency modulation control. When the total power of microgrid is insufficient and the frequency exceeds the limit due to sudden increase of load or sudden drop of generating power, It is necessary to re-determine the active power and frequency balance point of the system by using the secondary frequency modulation control. In this paper, three secondary frequency modulation strategies without communication system are proposed. By adjusting the droop control curve of adjustable inverter, on-line automatic secondary frequency modulation control is realized. According to the three strategies, the on-line tuning method of fixed value is put forward, and the sensitivity of maximum fixed value to the maximum output power and the dynamic performance of frequency modulation are compared. On this basis, the active power and frequency characteristics of microgrid are analyzed. Finally, the simulation model of microgrid with four synchronous inverters and three loads is built on the Matlab/Simulink simulation platform, which verifies the effectiveness of the proposed strategy.
【作者单位】： 中国电力科学研究院;伊利诺伊理工学院;湖南大学电气与信息工程学院;
【分类号】：TM71
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