摘要
The real-time simulation of the modular multilevel converter-based high-voltage direct current(MMC-HVDC)transmission system has become a popular research topic.However,in order to meet the real-time performance,the real-time simulation tech-nology will cause additional simulation errors for MMC-HVDC,especially on its fre-quency characteristics.Therefore,a parallel multi-rate simulation scheme for MMC-HVDC is developed in this work to ensure accurate simulation of high-frequency characteristics.Firstly,a non-error method based on converter transformer decoupling is proposed to decouple the converter and alternating current system;direct current transmission line decoupling and arm decoupling methods are used to achieve decoupling among and within converters.A multi-rate data synchronous mechanism is established by considering the differences among high-frequency characteristics caused by delayed data interaction.Secondly,the computing architectures of the primary system solver and modular multilevel converter controller are designed based on a field programmable gate array(FPGA).The real-time simulation platform for a four-terminal true bipolar MMC-HVDC is constructed based on the FPGA array.Thirdly,the factors in multi-rate simulation affecting the simulation accuracy of high-frequency characteristics are ana-lysed.The simulator is shown to be accurate in steady and dynamic states.The authors also verify its applicability for further research on high-frequency resonance based on control experiments.
基金
National Key Research and Development Program of China,Grant/Award Number:2022YFB2402700。
