Abstract
With the gradual increase of the penetration rate of wind and photovoltaic (PV) electricity, the power system is facing great challenges in integration and peak-shaving capacity. As flexibility resources of the system is limited, wind and PV power generation will not be consumed completely. Allowing the curtailment of the peak output of wind turbine and PV can reduce the cost of auxiliary services such as peak-shaving, relieve the huge pressure in the operation and planning of the system, and improve the overall power supply economy of the system. Firstly, the reason and optimization principle of the curtailment of the peak output of wind turbine and PV are explained. Then, a capacity optimal configuration method of power supply based on day-ahead economic dispatch is proposed. On the premise of allowing the curtailment of the peak output of wind turbine and PV, the corresponding annual power supply cost of wind turbine and PV capacity combination is calculated based on day-ahead unit commitment. The function fitting between power supply cost and wind turbine capacity is carried out. The best wind turbine and PV capacity combination is the value of the extreme point. Finally, the sensitivity analysis of example system is carried out. It is found that with the decrease of unit investment cost of wind turbine and PV equipment, developing wind and PV power generation will be a more economical choice in the future.
Highlights
With the gradual increase of the penetration rate of wind and photovoltaic (PV) electricity, the power system is facing great challenges in integration and peak-shaving capacity
PV can reduce the cost of auxiliary services
a capacity optimal configuration method of power supply based on day-ahead economic dispatch is proposed
Summary
With the gradual increase of the penetration rate of wind and photovoltaic (PV) electricity, the power system is facing great challenges in integration and peak-shaving capacity. 摘要:随着风光电量渗透率的逐步提高,电力系统在电网接纳能力、调峰能力等方面面临巨大的挑战,由于系统 灵活性资源有限,将不能100%地消纳风光电能,允许弃置一部分风光机组尖峰出力,可以降低系统调峰等辅助服 务的成本,缓解系统运行和规划中面临的巨大压力,同时提高系统整体供电经济性。首先,通过一个简化的电力 系统阐释了弃风弃光现象的原因和优化原理;然后,提出了一种基于日前经济调度的电源容量优化配置方法,以 允许弃置一部分风光机组尖峰出力为前提,基于时序运行仿真求取风光机组装机容量组合的年供电成本,进而对 多组年供电成本与风光机组装机容量开展函数拟合,在极值点处获得经济性最佳的风光机组容量规划方案;最后, 对给定场景的系统开展了敏感性分析,发现随着风光机组单位投资成本的下降,大力发展风光发电将会是未来更 为经济的选择。 累计装机容量均为世界第一[1,2]。随着科学技术的不断进 步,风机、光伏的设备成本也呈现出快速下降的趋势,但 风光机组发电具有间歇性、多变性以及不确定性[3,4], 必须在其他出力可控机组的配合下才能向负荷稳定供电。 随着风光电量渗透率的逐步提高,由于系统灵活性资源有
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