【摘要】：同步逆變器技術(shù)在分布式電源并網(wǎng)及微電網(wǎng)的應(yīng)用得到廣泛關(guān)注。針對(duì)基于多臺(tái)同步逆變器并列運(yùn)行的微電網(wǎng),對(duì)等下垂控制策略適用于一次調(diào)頻控制,當(dāng)負(fù)荷突增或發(fā)電功率突降造成微電網(wǎng)總體功率不足進(jìn)而頻率越限時(shí),需要采用二次調(diào)頻控制,重新確定系統(tǒng)的有功功率 頻率平衡點(diǎn)。文章提出了無(wú)需通信系統(tǒng)的3種二次調(diào)頻策略,通過(guò)調(diào)節(jié)可調(diào)逆變器的下垂控制曲線,實(shí)現(xiàn)在線自動(dòng)二次調(diào)頻控制。分別針對(duì)3種策略,提出定值在線整定方法,比較了最大定值對(duì)最大輸出功率的靈敏度及調(diào)頻動(dòng)態(tài)性能,在此基礎(chǔ)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(tái)搭建包含4臺(tái)同步逆變器、3個(gè)負(fù)載的微電網(wǎng)仿真模型,驗(yàn)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(guó)電力科學(xué)研究院;伊利諾伊理工學(xué)院;湖南大學(xué)電氣與信息工程學(xué)院;
【分類(lèi)號(hào)】：TM71

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