在基于MMC的新能源多端柔性直流并网系统(Multi-Terminal Flexible DC Transmission System,MTDC)中,传统下垂控制的下垂系数单一,难以适应复杂的扰动工况,影响系统运行的稳定性。因此,以直流电压裕度跟踪为基础,对传统下垂控制进行改...在基于MMC的新能源多端柔性直流并网系统(Multi-Terminal Flexible DC Transmission System,MTDC)中,传统下垂控制的下垂系数单一,难以适应复杂的扰动工况,影响系统运行的稳定性。因此,以直流电压裕度跟踪为基础,对传统下垂控制进行改进。通过在下垂系数中加入直流电压裕度校正因子,利用换流站实时直流电压偏差数据进行自适应调节,使系统直流电压在接近电压裕度上限时自动减小,保证系统在受到功率扰动或者换流站故障时直流电压稳定分布及有功功率合理分配。最后,建立四端新能源柔性直流并网系统仿真模型,并通过算例验证了控制策略在"N-1"故障下的有效性。展开更多
It is reported that depression induced by frontal lobe injury(FLI)has a devastating effect on human mental health.We previously reported that fasciculation and elongation protein zeta-1(FEZ1)was essential for astrocyt...It is reported that depression induced by frontal lobe injury(FLI)has a devastating effect on human mental health.We previously reported that fasciculation and elongation protein zeta-1(FEZ1)was essential for astrocytic protection of dopamine neurons.Studies of glutamate-glutamine cycle in mental ilness have been reported,whereas not from the perspective of astrocytes.This study was designed to investigate the role of astrocytic FEZ1 and glutamateglutamine cycle after FLI A model of FLI was established by inserting a blade into the right frontal lobe of rats.Behavioral test showed that FLI decreased exploratory activity.Western blot analysis revealed that the expression of astroglial proteins overall decreased in the initial injury stage,as well as FEZ1.展开更多
文摘在基于MMC的新能源多端柔性直流并网系统(Multi-Terminal Flexible DC Transmission System,MTDC)中,传统下垂控制的下垂系数单一,难以适应复杂的扰动工况,影响系统运行的稳定性。因此,以直流电压裕度跟踪为基础,对传统下垂控制进行改进。通过在下垂系数中加入直流电压裕度校正因子,利用换流站实时直流电压偏差数据进行自适应调节,使系统直流电压在接近电压裕度上限时自动减小,保证系统在受到功率扰动或者换流站故障时直流电压稳定分布及有功功率合理分配。最后,建立四端新能源柔性直流并网系统仿真模型,并通过算例验证了控制策略在"N-1"故障下的有效性。
文摘It is reported that depression induced by frontal lobe injury(FLI)has a devastating effect on human mental health.We previously reported that fasciculation and elongation protein zeta-1(FEZ1)was essential for astrocytic protection of dopamine neurons.Studies of glutamate-glutamine cycle in mental ilness have been reported,whereas not from the perspective of astrocytes.This study was designed to investigate the role of astrocytic FEZ1 and glutamateglutamine cycle after FLI A model of FLI was established by inserting a blade into the right frontal lobe of rats.Behavioral test showed that FLI decreased exploratory activity.Western blot analysis revealed that the expression of astroglial proteins overall decreased in the initial injury stage,as well as FEZ1.