Method and system for grid connection management of renewable energy generation

A system for a grid connection management of a renewable energy generation, comprising:

• a status acquisition unit, configured to obtain an operating condition data of a first power supply, a second power supply, a power grid, and a load in a preset period, and divide the operating condition data into the first condition data and the second condition data;
• a control unit, configured to establish a first optimal control model according to the first condition data, and establish a second optimal control model according to the second condition data;
• the first optimal control model includes a first model objective function, and the second optimal control model includes a second model objective function;
• a monitoring unit, configured to monitor grid connection management status of the first optimal control model and the second optimal control model, and a monitoring result is obtained;
• an analysis and switching unit, configured to analyze stability when the first optimal control model is switched to the second optimal control model through a preset algorithm according to the monitoring result, and an analysis result is obtained;
• and the analysis and switching unit is also configured to complete a switch from the first optimal control model to the second optimal control model according to the analysis result;
• wherein the first optimal control model is as follows:
• f1=αcost+βΣm=1MΣi=1NPm(Cuuim,s+Cddim,t),
• where cost is a total cost value of the first power supply and the second power supply under the first condition data, and m is a quantity value of the second power supply under different operation status under the first condition data, where m=1, 2, . . . , M, M is a total number of operation status;
• N is a total number of units in the first power supply, i represents an i-th unit, where i=1, 2, . . . , N;
• uim,t is a positive feedback value of output of the i-th unit in a t period under a m-th operation status, dim,t is a negative feedback value of output of the i-th unit in the t period under the m-th operation status, Cu is an adjustment coefficient of the positive feedback value of the output, Cd is an adjustment coefficient of the negative feedback value of the output, Pm is a power generated under the m-th operation status of the second power supply, α is a coefficient corresponding to cost, and β is a power adjustment coefficient under the first condition data.