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Analysis of the Influence on Power Losses by Converter Control Mode

Converter needs to absorb large amount of reactive power from AC power system when it transmits active power. The control mode of converters and the setting of each control mode will affect the quantity of reactive power directly. Thus, the control modes of converters are one of the important objectives for establishing the converter operation modes. The most familiar control mode of DC system is the constant power control in rectifier with constant extinction angle or constant direct voltage in inverter. In this paper, the power loss of the composing AC/DC power system is firstly analyzed. Then, the thyristor control modes are discussed in detail. Based on mathematic calculation and numeric simulation, this paper draws a conclusion that the system power losses would vary with the variety of control modes and their parameters.