基于同步逆變器的微電網(wǎng)二次調頻策略及特性分析
發(fā)布時間:2018-10-11 07:13
【摘要】:同步逆變器技術在分布式電源并網(wǎng)及微電網(wǎng)的應用得到廣泛關注。針對基于多臺同步逆變器并列運行的微電網(wǎng),對等下垂控制策略適用于一次調頻控制,當負荷突增或發(fā)電功率突降造成微電網(wǎng)總體功率不足進而頻率越限時,需要采用二次調頻控制,重新確定系統(tǒng)的有功功率 頻率平衡點。文章提出了無需通信系統(tǒng)的3種二次調頻策略,通過調節(jié)可調逆變器的下垂控制曲線,實現(xiàn)在線自動二次調頻控制。分別針對3種策略,提出定值在線整定方法,比較了最大定值對最大輸出功率的靈敏度及調頻動態(tài)性能,在此基礎上分析了微電網(wǎng)的有功功率 頻率特性。最后,用Matlab/Simulink仿真平臺搭建包含4臺同步逆變器、3個負載的微電網(wǎng)仿真模型,驗證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.
【作者單位】: 中國電力科學研究院;伊利諾伊理工學院;湖南大學電氣與信息工程學院;
【分類號】:TM71
本文編號: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.
【作者單位】: 中國電力科學研究院;伊利諾伊理工學院;湖南大學電氣與信息工程學院;
【分類號】:TM71
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