On-Line Assessment Method of Available Transfer Capability Considering Uncertainty of Renewable Energy Power Generation

Accurate and efficient on-line calculation of the available transfer capability (ATC) of the renewable energy delivery section is of great significance for improving the renewable energy consumption capacity while maintaining the safe and stable operation of the system. This paper proposes an ATC on-line assessment method that considers the uncertainty of renewable energy output. Based on the probability of output of each renewable energy plant, the probabilistic load flow is used to obtain the power interval and its probability of the key transmission section; the operational risk of each power interval is obtained by evaluating the situation of renewable energy unit's off-grid and load loss at the receiving end after the failure; the ATC value of the section is obtained with the goal of maximizing the difference between the revenue and the operational risk. This method improves the conservative calculation results of current on-line ATC and helps to improve the ability of renewable energy consumption. An example of an actual power grid verifies the effectiveness of the method.