DC support capacitor is an indispensable and important part of converter and its operating temperature will affect its service life.Therefore

it is necessary to study the influence of ripple current on its temperature rise.Firstly

the influence of heating power and ripple current of DC link capacitor on temperature rise is studied by taking DC support capacitor as the research object.Furthermore

the influence of ripple current on temperature rise is verified by temperature rise test and heating power calculation based on single frequency current.It is shown by the result show that the value and frequency of ripple current affect the temperature rise of DC support capacitor.The temperature rise of DC support capacitor is directly proportional to the square of the average root of ripple current and inversely proportional to the frequency of ripple current.The temperature rise of DC support capacitor is also directly proportional to the loss angle and inversely proportional to its heat dissipation area and shell heat dissipation coefficient.