两电平和三电平 VSC －HVDC 系统在输电环节中的效率分析与比较

摘要

An analytical method to calculate the efficiency of VSC-HVDC links based on two-level and three-level VSCs is presented.The method uses the average and root mean square of the VSC converter current to estimate the conversion losses in the converters ( conduction and switching losses) .The remaining power losses ( DC cable trans-mission losses due to I2 R, the losses in the coupling transformer, and AC harmonic filter losses) are evaluated using conventional well-known methods.Results obtained analytically are confirmed by digital simulations.%为了计算基于两电平和三电平的电压源换流器在VSC－HVDC系统里呈现的链路效率，我们使用平均根和均方根的方法来计算电压源换流器的转换电流的平方来测量换流器（传导和开关损耗）的转换损耗。剩余的功率损失（直流电缆侧由于I2 R产生的传输损耗，耦合变压器的损耗和交流侧谐波滤波器的损耗）用常规熟知的方法进行评价。得到的结果我们通过数字仿真进行分析和验证。