电网多时间尺度接纳可再生能源能力评估指标体系

以风光为代表的非水可再生能源发电出力具有波动性和随机性,这使得电网在日常调度中将风光发电出力视为负负荷,系统内风光比例的增多会增加不可控因素,使得电网接纳风光发电能力受到限制。限制因素包括电网调峰能力、电网调频能力、风光出力特性、负荷特性、电网外送通道等,构建电网接纳可再生能源能力评估指标可以反映电网的"饱和程度",为电力系统的规划运行提供参考和评价依据。根据影响电网接纳能力的多种因素构建多时间尺度的电网接纳可再生能源能力评估指标体系,分别从电网短期、中期和长期3个时间尺度,兼顾系统运行安全和经济因素,系统地评估电网接纳能力。通过指标量化值反映电网对不同比例的可再生能源的接纳程度。

Evaluation of Grid Accepting Renewable Energy in Multi-Time Scale

The volatility and randomization of wind power and solar energy make power grid regard them as negative load in daily dispatch.The uncontrollable factors caused by renewable energy ratio in system lead to the results that the abilities for power grid to receive wind power and solar energy might be limited, including power grid`s peak-load regulation capacity, frequency regulation capacity, renewable energy output characteristics, load characteristics, external transmission channel of power network and so forth.Setting up renewable resources accepted index can reflect the "saturation level" of power grid, which can provide reference and evaluation basis for the operation and management of electric system.This paper presents the indicator system which can reflect multi-time scale power grid`s acceptance ability for renewable resources, based on the multiple factors influencing power grid`s acceptance ability.And then, this paper systematically evaluates the acceptance capacity of grid in short term, mid-term and long term three time dimensions respectively, with taking into account the operation security and economic factors of the system.Through index quantization value the power grid`s acceptance ability with the different proportion of renewable resources can be reflected.