风光能源基地远距离直流输电方式选择

Selection of Long-distance Direct Current Transmission Mode of Wind-solar Energy

随着风和光等可再生能源的大规模开发,弃风弃光限电问题日益严重。为将大容量风光资源远距离输送到负荷中心,针对含丰富风光资源的远距离高压输电,分析风光混合能源的功率出力特性,提出了一种基于置信度的风光混合发电输送容量确定方法;同时,针对源端出力的不确定性、直流输电经济技术性等因素,提出了风光混合能源的远距离直流输电评判指标体系,最后基于后悔理论法对候选方案进行综合优选。算例表明该输送容量确定方法可有效结合源端特性和输电成本建立不同方案,并通过灵敏度分析给出不同输电方案的适用范围,从而为可再生能源的远距离输送规划提供指导依据。

With the large-scale and fast exploration of renewable wind-solar energy sources,wind curtailment and power limitation have become a problem at present.It refers to the phenomenon that some wind turbines in wind farms are suspended due to the local insufficient capacity to absorb,the mismatching of wind farm construction period,and the instability of wind power in the initial stage of wind power development,which wastes abundant wind resources.To merge large-capacity wind and solar resources into the power load center over a long distance,the power output characteristics of wind-solar hybrid energy were analyzed for high-voltage transmission of rich wind and solar energy,and a method for determining the transmission capacity of wind-solar hybrid power generation was proposed based on confidence degree.At the same time,considering the factors such as the uncertainty of the source output and the economic and technical characteristics of DC transmission,a long-distance DC transmission evaluation index system for wind-solar hybrid energy was designed.Finally,candidate schemes were selected and optimized comprehensively in regret theory.Results of a case calculation show that the selection method proposed could effectively combine the source characteristics and transmission cost with setup of different schemes,and the applicable scope of different transmission schemes could be given via sensitivity analysis,thus to provide guidance for long-distance transmission planning of renewable energy.