Control method of DC bus voltage of cascading multi-level power quality conditioners
A technology of power quality and control method, which is applied in the field of grid power quality research, can solve problems such as unbalanced capacitor voltage, affecting device compensation effect, affecting device safety and stable operation, etc., and achieves the effect of easy implementation and good reference value
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[0028] refer to figure 1A series multilevel power quality conditioner 3 is connected between the three-phase power supply 1 and the nonlinear load 2 . The main circuit structure of the series multilevel power quality conditioner 3 mainly includes: 6 single-phase full-bridge unit modules 3a1, 3a2, 3b1, 3b2, 3c1, 3c2 and 3 incoming inductances. The single-phase full-bridge unit module consists of a DC side energy storage element C ak ~C ck (k=1, 2) and voltage source PWM converters 301~306, in which the DC side energy storage elements are generally composed of power capacitors connected in series and parallel, and voltage source PWM (pulse width modulation) converters use fully controlled devices such as IGBT , GTO and other components. One end of the line inductance 31, 32 and 33 is connected in series to the A, B, C three-phase voltage source PWM converter, and the other end is connected in parallel between the three-phase power supply 1 and the nonlinear load 2. The select...
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