For domestic consumers in the rural areas of northern Kenya, as in other developing countries, the typical source of electrical supply is diesel generators. However, diesel generators are associated with both CO2 emis...For domestic consumers in the rural areas of northern Kenya, as in other developing countries, the typical source of electrical supply is diesel generators. However, diesel generators are associated with both CO2 emissions, which adversely affect the environment and increase diesel fuel prices, which inflate the prices of consumer goods. The Kenya government has taken steps towards addressing this issue by proposing The Hybrid Mini-Grid Project, which involves the installation of 3 MW of wind and solar energy systems in facilities with existing diesel generators. However, this project has not yet been implemented. As a contribution to this effort, this study proposes, simulates and analyzes five different configurations of hybrid energy systems incorporating wind energy, solar energy and battery storage to replace the stand-alone diesel power systems servicing six remote villages in northern Kenya. If implemented, the systems proposed here would reduce Kenya’s dependency on diesel fuel, leading to reductions in its carbon footprint. This analysis confirms the feasibility of these hybrid systems with many configurations being profitable. A Multi-Attribute Trade-Off Analysis is employed to determine the best hybrid system configuration option that would reduce diesel fuel consumption and jointly minimize CO2 emissions and net present cost. This analysis determined that a wind-diesel-battery configuration consisting of two 500 kW turbines, 1200 kW diesel capacity and 95,040 Ah battery capacity is the best option to replace a 3200 kW stand-alone diesel system providing electricity to a village with a peak demand of 839 kW. It has the potential to reduce diesel fuel consumption and CO2 emissions by up to 98.8%.展开更多
为探究韧性电网信息物理融合系统风险研究现状及发展趋势,基于中国知网(CNKI)和Web of Science(WoS)数据库2011—2023年的文献数据,利用CiteSpace对该领域研究的研究热点、前沿及演化趋势进行可视化分析。研究结果表明:国内研究形成以...为探究韧性电网信息物理融合系统风险研究现状及发展趋势,基于中国知网(CNKI)和Web of Science(WoS)数据库2011—2023年的文献数据,利用CiteSpace对该领域研究的研究热点、前沿及演化趋势进行可视化分析。研究结果表明:国内研究形成以“风险预警与控制”和“电力系统智能化建设”为主题的研究热点,国外研究形成以“信息物理融合”和“连锁故障演化”为主题的研究热点;“智能电网的信息物理耦合”和“信息网络攻击风险分析”是国内研究的前沿方向,“信息物理融合系统安全状态估计”和“风险防控模型”是国外研究的前沿方向;国内研究可分为安全性理论研究期、信息物理攻击风险研究期和故障防御恢复研究期3个时间阶段,国外研究可分为信息物理融合研究期和信息物理安全应用期2个时间阶段;后续研究应加强改进电力信息物理融合系统建模、完善电力信息物理融合系统规划、推进电力信息物理融合系统应用,推进数字化韧性电网稳定运行。研究结果可为韧性电网风险识别和风险预警研究提供一定参考。展开更多
新能源汇集经柔性直流输电(voltage source converter based high voltage direct current,VSC-HVDC)技术送出是促进新能源消纳的有效方式。但新能源渗透率的持续增加导致电网强度不断下降,采用传统跟网型(grid-following,GFL)换流技术...新能源汇集经柔性直流输电(voltage source converter based high voltage direct current,VSC-HVDC)技术送出是促进新能源消纳的有效方式。但新能源渗透率的持续增加导致电网强度不断下降,采用传统跟网型(grid-following,GFL)换流技术已无法满足系统稳定运行需求。为提高系统弱电网适应性,满足大规模新能源接入弱同步支撑柔直系统应用场景需求,提出在柔直系统送端换流站采用VSG控制策略。首先,建立整流侧控制小信号数学模型,利用根轨迹法深入研究虚拟阻抗对系统稳定性的影响。其次,提出利用交流电压变化率及电压差值等电气量构建虚拟电抗自适应调整项的改进VSG控制算法,在保证系统等效阻抗呈感性的同时,可提高送端交流系统的等效短路比,达到改善系统整体性能的效果。最后,通过PSCAD/EMTDC电磁暂态仿真验证所提控制策略的有效性。展开更多
文摘For domestic consumers in the rural areas of northern Kenya, as in other developing countries, the typical source of electrical supply is diesel generators. However, diesel generators are associated with both CO2 emissions, which adversely affect the environment and increase diesel fuel prices, which inflate the prices of consumer goods. The Kenya government has taken steps towards addressing this issue by proposing The Hybrid Mini-Grid Project, which involves the installation of 3 MW of wind and solar energy systems in facilities with existing diesel generators. However, this project has not yet been implemented. As a contribution to this effort, this study proposes, simulates and analyzes five different configurations of hybrid energy systems incorporating wind energy, solar energy and battery storage to replace the stand-alone diesel power systems servicing six remote villages in northern Kenya. If implemented, the systems proposed here would reduce Kenya’s dependency on diesel fuel, leading to reductions in its carbon footprint. This analysis confirms the feasibility of these hybrid systems with many configurations being profitable. A Multi-Attribute Trade-Off Analysis is employed to determine the best hybrid system configuration option that would reduce diesel fuel consumption and jointly minimize CO2 emissions and net present cost. This analysis determined that a wind-diesel-battery configuration consisting of two 500 kW turbines, 1200 kW diesel capacity and 95,040 Ah battery capacity is the best option to replace a 3200 kW stand-alone diesel system providing electricity to a village with a peak demand of 839 kW. It has the potential to reduce diesel fuel consumption and CO2 emissions by up to 98.8%.
文摘为探究韧性电网信息物理融合系统风险研究现状及发展趋势,基于中国知网(CNKI)和Web of Science(WoS)数据库2011—2023年的文献数据,利用CiteSpace对该领域研究的研究热点、前沿及演化趋势进行可视化分析。研究结果表明:国内研究形成以“风险预警与控制”和“电力系统智能化建设”为主题的研究热点,国外研究形成以“信息物理融合”和“连锁故障演化”为主题的研究热点;“智能电网的信息物理耦合”和“信息网络攻击风险分析”是国内研究的前沿方向,“信息物理融合系统安全状态估计”和“风险防控模型”是国外研究的前沿方向;国内研究可分为安全性理论研究期、信息物理攻击风险研究期和故障防御恢复研究期3个时间阶段,国外研究可分为信息物理融合研究期和信息物理安全应用期2个时间阶段;后续研究应加强改进电力信息物理融合系统建模、完善电力信息物理融合系统规划、推进电力信息物理融合系统应用,推进数字化韧性电网稳定运行。研究结果可为韧性电网风险识别和风险预警研究提供一定参考。
文摘新能源汇集经柔性直流输电(voltage source converter based high voltage direct current,VSC-HVDC)技术送出是促进新能源消纳的有效方式。但新能源渗透率的持续增加导致电网强度不断下降,采用传统跟网型(grid-following,GFL)换流技术已无法满足系统稳定运行需求。为提高系统弱电网适应性,满足大规模新能源接入弱同步支撑柔直系统应用场景需求,提出在柔直系统送端换流站采用VSG控制策略。首先,建立整流侧控制小信号数学模型,利用根轨迹法深入研究虚拟阻抗对系统稳定性的影响。其次,提出利用交流电压变化率及电压差值等电气量构建虚拟电抗自适应调整项的改进VSG控制算法,在保证系统等效阻抗呈感性的同时,可提高送端交流系统的等效短路比,达到改善系统整体性能的效果。最后,通过PSCAD/EMTDC电磁暂态仿真验证所提控制策略的有效性。
