Datasheet-Based Hybrid Simulation Approach for On-Line Power Loss Estimation of UHVDC Thyristor

The UHVDC system can realize long-distance and large-capacity power transmission, hence its power loss is important for analysis, which directly influences operating costs. Thyristor losses, as the core loss component of the UHVDC converter station, are challenging to measure directly, especially for real-time operating conditions. Therefore, this paper presents a datasheet-based hybrid simulation approach for estimating UHVDC thyristor power loss in real time. At first, the expression for thyristor power consumption is obtained through a curve-fitting process on the datasheet. Then, the hybrid simulation approach is designed based on the PSCAD-MATLAB interface. The PSCAD model gathers operating point data, while MATLAB calculate this data using a loss estimation algorithm. The proposed hybrid simulation approach is validated through a PSCAD-MATLAB co-simulation with less than 2% loss error compared to the standard method, showing its real-time accuracy and efficiency.