Microgrid (MG) is a small entity of electrical network which comprises of various Distributed Generation (DG) sources, storage devices, and group of loads in various classes. MG provides reliable and secure energy sup...Microgrid (MG) is a small entity of electrical network which comprises of various Distributed Generation (DG) sources, storage devices, and group of loads in various classes. MG provides reliable and secure energy supply to the critical loads of communities while operating either in on-grid or off-grid mode. In this study, a coordinated power management control strategy for a typical low voltage (LV) MG network with integration of solar Photovoltaic (PV) and storage facility has been developed and analysed in Matlab-Simu-link software environment at various modes (on-grid, off-grid, and on-grid to off-grid transition) of MG operation. Solar PV and battery power inverters are considered as grid-support grid-forming (GsGfm) Voltage Source Inverter (VSI) with the implementation of modified droop and virtual output impedance control strategies. Proposed control strategy supports coordinated control operation between PV units and battery storage, equal power sharing among the DG sources, and smooth MG mode transition with regulation of voltage and frequency level in MG network. In addition, voltage and current THD level were analysed and verified as per the standard of AS4777.展开更多
随着新能源渗透率的不断提升,电力系统呈现出弱惯量、低阻尼、频率波动频发和宽频振荡等特征,给系统稳定性带来了挑战。构网型储能(grid-forming energy system,GFM-ESS)不仅具备主动提供暂态支撑的能力,还可增强系统稳定性。首先刻画了...随着新能源渗透率的不断提升,电力系统呈现出弱惯量、低阻尼、频率波动频发和宽频振荡等特征,给系统稳定性带来了挑战。构网型储能(grid-forming energy system,GFM-ESS)不仅具备主动提供暂态支撑的能力,还可增强系统稳定性。首先刻画了GFM-ESS在多时间尺度下的频率与电压支撑能力,构建其核心支撑功能的数学模型,并基于灵敏度解析法,解耦并量化各支撑功率分量之间的交互影响,实现对备用功率的多维度精细表征。在此基础上,综合集成频率稳定性与小信号稳定性非线性约束,引入数据驱动建模方法实现线性化处理。最后,构建兼顾经济性、稳定性与支撑能力的优化配置模型,实现GFM-ESS容量的优化决策。通过改进的IEEE-39节点系统验证了所提方法的有效性。展开更多
西藏电网与西北和西南电网联网后形成交直流并联格局和长链式通道弱交流连接,电压控制难度大。网内电网源荷分布不均,负荷中心缺乏电源支撑,随着负荷增长,网内重要断面故障后藏中地区电网电压不稳定问题突出。针对藏中地区负荷增长对西...西藏电网与西北和西南电网联网后形成交直流并联格局和长链式通道弱交流连接,电压控制难度大。网内电网源荷分布不均,负荷中心缺乏电源支撑,随着负荷增长,网内重要断面故障后藏中地区电网电压不稳定问题突出。针对藏中地区负荷增长对西藏电网电压稳定影响进行了深入分析,提出了在那曲和阿里地区分别配置构网型同步调相机的系统设计方案,用于解决藏中电网无功支撑不足引起的电压不稳定问题,并在电网故障后能够提供有功功率支撑,作为解决西藏那曲和阿里区域电网供电出现故障的过渡补充手段,并进行了仿真计算,验证了构网型静止无功发生器(static var generator,SVG)在电网故障瞬间,能够为系统提供无功支撑和短时有功输出。那曲和阿里电网构网型静止同步调相机投运后,为电网的稳定运行提供了无功和有功支撑。展开更多
文摘Microgrid (MG) is a small entity of electrical network which comprises of various Distributed Generation (DG) sources, storage devices, and group of loads in various classes. MG provides reliable and secure energy supply to the critical loads of communities while operating either in on-grid or off-grid mode. In this study, a coordinated power management control strategy for a typical low voltage (LV) MG network with integration of solar Photovoltaic (PV) and storage facility has been developed and analysed in Matlab-Simu-link software environment at various modes (on-grid, off-grid, and on-grid to off-grid transition) of MG operation. Solar PV and battery power inverters are considered as grid-support grid-forming (GsGfm) Voltage Source Inverter (VSI) with the implementation of modified droop and virtual output impedance control strategies. Proposed control strategy supports coordinated control operation between PV units and battery storage, equal power sharing among the DG sources, and smooth MG mode transition with regulation of voltage and frequency level in MG network. In addition, voltage and current THD level were analysed and verified as per the standard of AS4777.
文摘随着新能源渗透率的不断提升,电力系统呈现出弱惯量、低阻尼、频率波动频发和宽频振荡等特征,给系统稳定性带来了挑战。构网型储能(grid-forming energy system,GFM-ESS)不仅具备主动提供暂态支撑的能力,还可增强系统稳定性。首先刻画了GFM-ESS在多时间尺度下的频率与电压支撑能力,构建其核心支撑功能的数学模型,并基于灵敏度解析法,解耦并量化各支撑功率分量之间的交互影响,实现对备用功率的多维度精细表征。在此基础上,综合集成频率稳定性与小信号稳定性非线性约束,引入数据驱动建模方法实现线性化处理。最后,构建兼顾经济性、稳定性与支撑能力的优化配置模型,实现GFM-ESS容量的优化决策。通过改进的IEEE-39节点系统验证了所提方法的有效性。
文摘西藏电网与西北和西南电网联网后形成交直流并联格局和长链式通道弱交流连接,电压控制难度大。网内电网源荷分布不均,负荷中心缺乏电源支撑,随着负荷增长,网内重要断面故障后藏中地区电网电压不稳定问题突出。针对藏中地区负荷增长对西藏电网电压稳定影响进行了深入分析,提出了在那曲和阿里地区分别配置构网型同步调相机的系统设计方案,用于解决藏中电网无功支撑不足引起的电压不稳定问题,并在电网故障后能够提供有功功率支撑,作为解决西藏那曲和阿里区域电网供电出现故障的过渡补充手段,并进行了仿真计算,验证了构网型静止无功发生器(static var generator,SVG)在电网故障瞬间,能够为系统提供无功支撑和短时有功输出。那曲和阿里电网构网型静止同步调相机投运后,为电网的稳定运行提供了无功和有功支撑。
