Safety and Reliability Evaluation Method for Intelligent Operation and Maintenance of Converter Station Based on Situation Awareness of Relay Protection Devices

When evaluating the operation status of converter stations, due to its dynamic development attribute, the evaluation results are quite different from the actual situation. Therefore, a study on the safety reliability evaluation method of intelligent operation and maintenance of converter stations based on situation awareness of relay protection devices is proposed. After building the converter station control structure model around the outer ring control structure, double dq-PI current control structure and synchronous rotating coordinate transformation structure, combining the dependency between the converter station protection process and the relay protection device, the domain mapping matrix is used to describe the implementation of the protection process of the relay protection device and quantify it according to the healthy state. After the node status of the converter station is divided into infection status and failure status, the safety reliability of the intelligent operation and maintenance of the converter station is evaluated according to the status transfer relationship between relay protection devices. In the test results, the design method has a high accuracy for the evaluation results of the converter station node status and the overall intelligent operation and maintenance security reliability of the converter station.