水风光储一体化系统中储能平抑出力波动效果评价研究

Evaluation Study on the Effect of Energy Storage to Smooth out Power Fluctuation in Integrated Water,Wind,Light and Storage System

随着新型电力系统的发展,风能、光能等高比例新能源的联网运行是实现其大规模开发利用重要途径,也是在双碳政策背景下节能减排的重要方式。由于风电和光伏出力具有极强的随机性与不可控性,高比例的风电与光伏接入电网势必会产生巨大的波动,从而降低电能质量,给电网运行带来许多不便。如何既能高比例地消纳风电与光伏,又能尽量减少其并网产生的不利影响成为一项重要课题。本文建立了风电、光伏及水电的出力模型,分析了不同情景下的出力特点与趋势,根据其出力的强不确定性、间歇性与周期性的特点,计算不同组合方式下的组合能源系统出力数据并对比分析。以某水电站为例,建立以水电调节为主的水风光发电系统,并在其中加入超短期储能装置,研究发现此组合能源出力系统可以很好地平抑出力波动并达到出力最高,且经济效益良好。

With the development of new power system,the network operation of high proportion of new energy sources such as wind and photovoltaic is an important way to realize their large-scale development and utilization,and also an important way to save energy and reduce emissions under the background of double carbon policy.Due to the strong randomness and uncontrollability of wind power and photovoltaic output,the high proportion of wind power and photovoltaic access to the grid will inevitably produce huge fluctuations,thus reducing the quality of power and bringing a lot of inconvenience to the grid operation.It is an important issue to find out how to minimize the negative impact of the grid connection while absorbing a high proportion of wind power and PV.In this paper,we establish a model of wind power,photovoltaic and hydropower output,analyze the characteristics and trends of the output under different scenarios,and calculate and compare the output data of the combined energy system under different combinations according to their strong uncertainty,intermittency and periodicity.Taking a hydropower station as an example,a hydropower regulation-based water and scenery power generation system is established,and ultra-short-term energy storage devices are added into it,and it is found that this combined energy generation system can well suppress power fluctuations and achieve the highest power output with good economic benefits.