级联多电平DVR逆变器的损耗分析和计算

Power Dissipation Analysis for Multi-level Dynamic Voltage Restorer

由于级联多电平动态电压调节器(DynamicVoltageRestorer,DVR)自身的特点,在不同工作模式下,设备的损耗有所不同。当DVR工作于待机模式时,仅仅需要考虑多重变压器的空载损耗和逆变器开关器件的通态损耗;当DVR处于补偿模式时,需要计算多重变压器的铜耗和铁耗、整流电路损耗、逆变器和Boost电路开关器件的通态损耗和开关损耗。本文着重探讨DVR逆变器的损耗构成,介绍了计算开关器件通态损耗的方法,并利用器件供应商提供的开关损耗曲线给出计算开关损耗的方法,最终得到补偿模式和待机模式下DVR逆变器损耗功率。

Because of the characters of multi-level Dynamic Voltage Restorer （DVR）,the power dissipation of DVR is greatly different for the device operating in compensation mode or standby mode.In the standby mode, only the multi- winding transformer exciting core dissipation and IGBT conducting loss will be calculated.In the compensation mode, both core and copper losses of multi-winding transformer,loss of diodes in rectifiers, switching loss and conducting loss of IGBT in the Boost circuits and in the inverters should be calculated.Employing the loss characteristic curves provided by manufactures and the power loss calculation program developed by authors, we have found the inverter＇s dissipation for the proposed DVR in compensation mode and standby mode.