Spot quotation alliance modeling method of cascade hydropower based on symbiosis theory

Abstract

There is a highly coupled space-time hydraulic connection between cascade hydropower stations (CHSs), therefore CHSs cannot stand alone in market competition. Symbiosis is a co-twin way of alliance, which helps to resist variable market risk factors. Thus, this paper proposes a spot quotation alliance modeling method of CHSs based on symbiosis theory. First, based on the components explanation and symbiotic effect evaluation of the cascade hydropower symbiotic system (CHSS), a quotation alliance formation model with the goal of maximizing the symbiotic effect is built. Then, in order to reduce blindness while retaining the autonomy of power producers, a 5-stage power and price declaration strategy is proposed. The case study with eight hydropower stations in Sichuan Province of China shows that the three stations can get an increase of 2.23% in market shares and 2.13% in power generation revenue when forming a quotation alliance, and can help the grid save 16,900 yuan in power purchase cost at the same time. It reveals that jointly participating in market competition with others can not only increase the alliance’s market shares and power generation revenue, but also reduce the total power purchase cost of the grid.