Abstract
Consumption of renewable energy and complexity and difficulty of power purchase decision-making for power grid companies are ensured and increased by the formal implementation of renewables portfolio standards. From the standpoint of grid companies, this paper constructs a multi-type power purchase model of grid companies after the implementation of the renewables portfolio standards. Firstly, the electricity market is classified according to different types of electricity, and the power purchase cost function of different types of electricity is established. Considering the error of load forecasting, a conditional value at risk model for evaluating deviated electricity quantity is established to describe the influence of deviated electricity quantity on power purchase risk. Finally, an example is given to analyze the influence of different quotas in different scenarios on the power purchase decisions of power grid companies, which provides theoretical reference for the actual market transactions of power grid companies.
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