Due to p q i -i current detection method based on instantaneous reactive power theory will produce detecting error when voltage is unbalance, This paper proposed a method which uses the phase angle of positive sequence fundamental voltage to correct the error, Simulation results show that the active and reactive component of positive sequence fundamental current and the active and reactive component of negative sequence fundamental current can be obtained rapidly and accurately. Keywords-asymmetrical supply voltaget; instantaneous reactive power theory; p q i -i I.
A novel PWM technique for single-switch threephase AC-DC buck converter is proposed to reject input voltage fluctuation, obtain high quality output voltage and realize open-loop operation mode. By controlling the duty cycle of the switch which tracks the change of input voltage, the energy supplied by ac mains and the energy consumed in load can keep invariable in every switching cycle. So the output
dc voltage maintains at a constant value and random-harmonic voltage contained in input stage is eliminated. Based on the principle of energy conservation, the system operation is analyzed and the control strategy is introduced in detail both in discontinuous conduction mode (DCM) and continuous conduction mode (CCM).Experimental results are provided to show its validity and feasibility.
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