考虑可再生能源消纳责任的售电公司购电决策分析

Energy Purchasing Strategy of Electricity Retailer Considering the Responsibility of Renewable Energy Consumption

作为电力交易的主要参与者之一,售电公司须积极承担消纳可再生能源的责任。为分析可再生能源消纳责任考核对售电公司的影响,建立购电组合投资模型。模型采用场景法描述现货电价、可再生能源出力等因素的不确定性,以考虑条件风险价值的交易成本最小化为目标制定售电公司最优购电策略,并引入消纳责任考核的惩罚机制,实现对考核力度作用的评估。模型采用MATLAB中YALMIP工具箱进行线性规划的求解。采用算例仿真分析风险偏好程度、消纳责任指标、可再生能源预测准确度、监管部门惩罚力度等因素对售电公司最优购电策略的影响,验证了模型的有效性。

As one of the major players in electricity trading,the electricity retailer should actively undertake the responsibility of consuming renewable energy.To analyze the influence of the renewable portfolio standard(RPS)on electricity retailers,this paper constructed a new portfolio investment model of energy purchasing.Scenario analysis is performed to describe the uncertainty about the spot price and renewable energy output in electricity markets.The optimal energy purchasing strategy is developed with the minimum transaction cost based on the conditional value-at-risk(CVaR)as the goal,and the punishment mechanism for consumption responsibility examination is introduced to evaluate different examination criteria.The YALMIP toolbox in MATLAB is adopted to solve linear programming in this model.In addition,the influence of risk preference,RPS quotas,renewable-energy forecast accuracy,and the degrees of penalties from regulatory authorities on the optimal energy purchasing strategy of electricity retailers is analyzed by simulation.The results show that the proposed model is effective.