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Wang, Weixin,Wu, Fengjiang,Zhao, Ke,Sun, Li,Duan, Jiandong,Sun, Dongyang The Korean Institute of Power Electronics 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.4
Battery energy storage devices (ESDs) have become more and more commonplace to maintain the stability of islanded power systems. Considering the limitation in inverter capacity and the requirement of flexibility in the ESD, the droop control was implemented in paralleled ESDs for higher capacity and autonomous operation. Under the conventional droop control, state-of-charge (SoC) errors between paralleled ESDs is inevitable in the discharging operation. Thus, some ESDs cease operation earlier than expected. This paper proposes an adaptive accelerating parameter to improve the performance of the SoC error eliminating droop controller under the constraints of a microgrid. The SoC of a battery ESD is employed in the active power droop coefficient, which could eliminate the SoC error during the discharging process. In addition, to expedite the process of SoC error elimination, an adaptive accelerating parameter is dedicated to weaken the adverse effect of the constraints due to the requirement of the system running. Moreover, the stability and feasibility of the proposed control strategy are confirmed by small-signal analysis. The effectiveness of the control scheme is validated by simulation and experiment results.
Meichen Liu,Yu Zhao,Baojin Yao,Hui Zhang,Huanyu Guo,Dongyang Hu,Qun Wang 한국유전학회 2014 Genes & Genomics Vol.36 No.5
The most commonly used normalization strategyfor quantitative real-time reverse transcription-polymerasechain reaction (RT-qPCR) is to select a stablereference gene. However, to date, no suitable referencegenes have been identified in sika deer antler tissues. Thus,the aim of this study was to identify the most stable gene ora set of genes to be used as reference genes for RT-qPCRanalysis in sika deer antler tissues. We first selected candidatereference genes using sika deer antler gene expressiondata from an Illumina sequencing platform (Hiseq2000); twenty-one reference genes from the antler tips ofChinese sika deer were selected to test for the normalizationof expression levels during different growth stages. These genes were tested by RT-qPCR and ranked accordingto the stability of their expression using two differentmethods (implemented in geNorm and NormFinder). Based on different algorithms and analytical procedures,our results clearly indicate RPL40 and Gpx as the moststable reference genes of our pool.
Weixin Wang,Fengjiang Wu,Ke Zhao,Li Sun,Jiandong Duan,Dongyang Sun 전력전자학회 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.4
Battery energy storage devices (ESDs) have become more and more commonplace to maintain the stability of islanded power systems. Considering the limitation in inverter capacity and the requirement of flexibility in the ESD, the droop control was implemented in paralleled ESDs for higher capacity and autonomous operation. Under the conventional droop control, state-of-charge (SoC) errors between paralleled ESDs is inevitable in the discharging operation. Thus, some ESDs cease operation earlier than expected. This paper proposes an adaptive accelerating parameter to improve the performance of the SoC error eliminating droop controller under the constraints of a microgrid. The SoC of a battery ESD is employed in the active power droop coefficient, which could eliminate the SoC error during the discharging process. In addition, to expedite the process of SoC error elimination, an adaptive accelerating parameter is dedicated to weaken the adverse effect of the constraints due to the requirement of the system running. Moreover, the stability and feasibility of the proposed control strategy are confirmed by small-signal analysis. The effectiveness of the control scheme is validated by simulation and experiment results.