Primary frequency response based rescheduling for enhancing microgrid resilience

The existing microgrid operation schemes do not consider the dynamic performance of frequency in the islanded operation of microgrids.When an islanded microgrid encounters a disturbance,the sudden power mismatch could impose security risks or even a system collapse.To address such a challenge,this paper proposes the primary frequency response rescheduling(PFRR)approach.For a certain operation interval,the PFRR will optimally reschedule the distributed generators(DGs)with non-zero mechanical inertia and adjust the battery power.And the objective is to limit the rate-of-change-of-frequency(ROCOF)and to maintain the post-disturbance frequency nadir above a prescribed threshold.The effectiveness of the proposed strategy is verified by a case study on the IEEE 123-node test feeder system and the timedomain simulation in MATLAB Simulink.

菌株S01324对燕麦孢囊线虫的杀线活性及其种类鉴定

燕麦孢囊线虫是我国小麦孢囊线虫病的重要病原之一,为寻找适宜的生防菌株,本研究通过室内生测、室内杯栽试验以及田间管栽试验对菌株S01324的菌体和发酵滤液进行了杀线虫活性测定。室内生测结果发现,菌株S01324对孢囊的寄生率达到100.0%;处理8 d后,菌株发酵滤液原液对卵孵化的抑制率为98.8%,发酵滤液稀释16倍对卵孵化的抑制率仍能达到42.0%;处理24 h后发酵滤液原液对二龄幼虫(J2)的校正死亡率达到100.0%,而处理6 d后发酵滤液8倍稀释液也能杀死全部J2。杯栽试验发现,发酵滤液原液和麦粒培养物处理后,孢囊减少率分别为50.6%和62.1%。管栽试验发现,发酵滤液原液和麦粒培养物处理后,孢囊减少率分别为60.8%和58.9%。通过形态学和序列分析,菌株S01324鉴定为绳状青霉(Penicillium funiculosum)。这是关于绳状青霉杀线活性的首次报道。