With the development of AC and DC hybrid transmission technology, research on the protection of converter is becoming more and more important. According to the commutation relation between bus voltage of converter station and the output DC voltage of converter. The generalized ratio is defined, and a new method of converter station integrated protection based on generalized ratio is proposed. This method uses the idea of integrated protection to divide the converter station into regions. The generalized ratio is used to achieve real-time online monitoring of fault element anomalies and failures. And in accordance with CT current characteristics of the valve side of converter transformer bushing CT, it can accurately locate the fault current signature element. Through failure analysis and EMTDC/PSCAD simulation, protection under various fault conditions commutation element can operate correctly.