The power losses in a voltage source inverter (VSI) are the sum of the additional constant power losses of the local power supply, the inverter circuits as well as the main power conversion losses. Power conversion losses consist of the power losses on switches (e.g. static power losses on the resistances of the switches in the “on state” and the dynamic switching power losses), the power losses on the serial resistances of the filter inductor winding together with the resistances of all of the serial inverter connections and the power losses of the filter coil, which are dependent on the material of the filter coil core. All of these power conversion losses can be presented as losses on the one equivalent serial resistance that is connected serially with the filter coil. This nonlinear (depending on the load and the switching frequency) serial equivalent resistance R_se can be calculated from the parameters of the maximum point of the measured magnitude Bode plot of the control transfer function of the inverter. The paper presents the concept of measuring the Bode plots of the control transfer function in order to get the serial equivalent resistance and to calculate the power conversion losses of an experimental model and discusses the accuracy of the results.

电压源逆变器（VSI）中的功率损耗是本地电源，逆变器电路的附加恒定功率损耗以及主功率转换损耗的总和。功率转换损耗包括开关上的功率损耗（例如，处于“导通”状态的开关的电阻上的静态功率损耗和动态开关功率损耗），滤波电感器绕组的串联电阻上的功率损耗以及功率因数。所有串联逆变器连接的电阻和滤波线圈的功率损耗取决于滤波线圈芯的材料。所有这些功率转换损耗都可以表示为与滤波器线圈串联的一个等效串联电阻的损耗。R _se可以从逆变器的控制传递函数的测量幅度Bode图的最大点的参数中得出。本文提出了测量控制传递函数的波特图的概念，以获得串行等效电阻并计算实验模型的功率转换损耗，并讨论了结果的准确性。