以新能源为主体的微电网系统存在前期资本投入大、电网刚性不足等问题,特别是离网型微电网由于失去大电网的支撑,安全稳定运行面临更大的挑战。本文针对离网型交流微电网设计了双层调度策略,即经济最优化日前调度和日内稳定运行实时调度...以新能源为主体的微电网系统存在前期资本投入大、电网刚性不足等问题,特别是离网型微电网由于失去大电网的支撑,安全稳定运行面临更大的挑战。本文针对离网型交流微电网设计了双层调度策略,即经济最优化日前调度和日内稳定运行实时调度,在多时间尺度下灵活规划发电主体出力。首先,日前调度以微电网经济性运行为目标,利用全生命周期理论建立经济模型,计及储能电池荷电状态(state of charge,SOC)对寿命的影响;其次,日内实时调度以供电稳定性为目标,充分考虑预测误差给系统带来的可能性崩溃,利用储能PQ源实时修正VF源的功率偏差,改善储能VF源的健康状态;最后,通过算例仿真,得到满足微电网经济、稳定运行的综合优化调度方案,并验证了该策略的有效性和合理性。展开更多
This paper presents a method for optimal sizing of an off-grid hybrid microgrid (MG) system in order to achieve a certain load demand. The hybrid MG is made of a solar photovoltaic (PV) system, wind turbine (TW) and e...This paper presents a method for optimal sizing of an off-grid hybrid microgrid (MG) system in order to achieve a certain load demand. The hybrid MG is made of a solar photovoltaic (PV) system, wind turbine (TW) and energy storage system (ESS). The reliability of the MG system is modeled based on the loss of power supply probability (SPSP). For optimization, an enhanced Genetic Algorithm (GA) is used to minimize the total cost of the system over a 20-year period, while satisfying some reliability and operation constraints. A case study addressing optimal sizing of an off-grid hybrid microgrid in Nigeria is discussed. The result is compared with results obtained from the Brute Force and standard GA methods.展开更多
Rural electrification remains a great challenge for Sub-Saharan Africa (SSA) as access to electricity is a prerequisite to accelerate its development. The present paper reviews the measures adopted to promote access t...Rural electrification remains a great challenge for Sub-Saharan Africa (SSA) as access to electricity is a prerequisite to accelerate its development. The present paper reviews the measures adopted to promote access to electricity in rural and remote areas of SSA. The main barriers to rural electrification in these developing countries are presented before showing technologies used for the aforementioned purpose. Then, adopted methods for enhancing the use of renewable energy in SSA are shown. Moreover, the policy adopted by decision makers and project planners are also highlighted. In addition, the optimal solutions proposed by researchers are given such as the cost-effective off-grid system type that might be a viable alternative to diesel power generation.展开更多
文摘以新能源为主体的微电网系统存在前期资本投入大、电网刚性不足等问题,特别是离网型微电网由于失去大电网的支撑,安全稳定运行面临更大的挑战。本文针对离网型交流微电网设计了双层调度策略,即经济最优化日前调度和日内稳定运行实时调度,在多时间尺度下灵活规划发电主体出力。首先,日前调度以微电网经济性运行为目标,利用全生命周期理论建立经济模型,计及储能电池荷电状态(state of charge,SOC)对寿命的影响;其次,日内实时调度以供电稳定性为目标,充分考虑预测误差给系统带来的可能性崩溃,利用储能PQ源实时修正VF源的功率偏差,改善储能VF源的健康状态;最后,通过算例仿真,得到满足微电网经济、稳定运行的综合优化调度方案,并验证了该策略的有效性和合理性。
文摘This paper presents a method for optimal sizing of an off-grid hybrid microgrid (MG) system in order to achieve a certain load demand. The hybrid MG is made of a solar photovoltaic (PV) system, wind turbine (TW) and energy storage system (ESS). The reliability of the MG system is modeled based on the loss of power supply probability (SPSP). For optimization, an enhanced Genetic Algorithm (GA) is used to minimize the total cost of the system over a 20-year period, while satisfying some reliability and operation constraints. A case study addressing optimal sizing of an off-grid hybrid microgrid in Nigeria is discussed. The result is compared with results obtained from the Brute Force and standard GA methods.
文摘Rural electrification remains a great challenge for Sub-Saharan Africa (SSA) as access to electricity is a prerequisite to accelerate its development. The present paper reviews the measures adopted to promote access to electricity in rural and remote areas of SSA. The main barriers to rural electrification in these developing countries are presented before showing technologies used for the aforementioned purpose. Then, adopted methods for enhancing the use of renewable energy in SSA are shown. Moreover, the policy adopted by decision makers and project planners are also highlighted. In addition, the optimal solutions proposed by researchers are given such as the cost-effective off-grid system type that might be a viable alternative to diesel power generation.
