Modelling of Modular Multilevel Converter Loss Based on Current Injection Method
The valve body loss of the modular multilevel converter(MMC)is relatively large,and the refined electromagnetic transient simulation of the MMC based high voltage direct current(MMC-HVDC)requires more accurate simulation of the valve body loss for system efficiency study.Aiming at the problems of virtua losses caused by the use of equivalent models in existing MMC-HVDC electromagnetic transient simulation,a MMC-HVDC electromagnetic transient modeling method with valve body loss based on current injection method is proposed,which includes accurate automatic calculation of valve body losses under different operating conditions using the finite sampling method.Referring to the calculation results,the current injection method is used to compensate for losses in the modeling and dynamic tracking and simulation of converter valve losses are realized.Finally,the ac-curacy of the proposed method is verified by constructing a MMC-HVDC electromagnetic transient simulation model in PSCAD.The research results can be used to accurately simulate MMC-HVDC electromagnetic transient modeling with valve body losses,and further research on loss reduction measures can be carried out through simulation.
万方数据
维普
