Secondary clearing rules and price determination in direct electricity trading with renewable energy consumption

To promote the accommodation of renewable energy, when renewable energy power generation enterprises participate in the direct purchase of Shanghai power market, all their power needs to be purchased. To satisfy this policy, some provinces use a trading mechanism called secondary clearing, which lacks of relevant research. Therefore, it is necessary to study the transaction process and pricing method of this mechanism. According to the power market model of bilateral bidding and marginal clearing price, this paper establishes a mathematical model of power market which combines matching clearing and secondary clearing, puts forward three principles that pricing of secondary clearing should conform to, and analyses the problems existing in marginal price. A new pricing method is put forward by illustrating with an example.