In predictive direct power control(PDPC)system of three-phase pulse width modulation(PWM)rectifier,grid voltage sensor makes the whole system more complex and costly.Therefore,third-order generalized integrator(TOGI)i...In predictive direct power control(PDPC)system of three-phase pulse width modulation(PWM)rectifier,grid voltage sensor makes the whole system more complex and costly.Therefore,third-order generalized integrator(TOGI)is used to generate orthogonal signals with the same frequency to estimate the grid voltage.In addition,in view of the deviation between actual and reference power in the three-phase PWM rectifier traditional PDPC strategy,a power correction link is designed to correct the power reference value.The grid voltage sensor free algorithm based on TOGI and the corrected PDPC strategy are applied to three-phase PWM rectifier and simulated on the simulation platform.Simulation results show that the proposed method can effectively eliminate the power tracking deviation and the grid voltage.The effectiveness of the proposed method is verified by comparing the simulation results.展开更多
In order to improve the ability of harmonic suppression,and reduce the loss of switching devices,this paper proposes an active harmonic suppression method at dc side of multi-pulse rectifier(MPR) . The circulating cur...In order to improve the ability of harmonic suppression,and reduce the loss of switching devices,this paper proposes an active harmonic suppression method at dc side of multi-pulse rectifier(MPR) . The circulating current through secondary winding of active inter-phase reactor(AIPR) is derived from the current relation between the ac and dc sides of MPR when the threephase input currents are sinusoidal simultaneously,and an applicable circulating current is presented. According to the relation between voltage across secondary winding of AIPR and the applicable current,it is confirmed that harmonic energy of input line current can be consumed by the resistor in series with the secondary winding. A half-bridge PWM rectifier is designed to abstract the harmonic power and to feed the load,which can realize the recycling of harmonic energy. Experimental results show that the power factor of the proposed system is approximately equal to one when the PWM rectifier operates normally,and that the proposed system has the ability of anti-variation of load and input voltage.展开更多
基金National Natural Science Foundation of China(Nos.51767013,52067013)。
文摘In predictive direct power control(PDPC)system of three-phase pulse width modulation(PWM)rectifier,grid voltage sensor makes the whole system more complex and costly.Therefore,third-order generalized integrator(TOGI)is used to generate orthogonal signals with the same frequency to estimate the grid voltage.In addition,in view of the deviation between actual and reference power in the three-phase PWM rectifier traditional PDPC strategy,a power correction link is designed to correct the power reference value.The grid voltage sensor free algorithm based on TOGI and the corrected PDPC strategy are applied to three-phase PWM rectifier and simulated on the simulation platform.Simulation results show that the proposed method can effectively eliminate the power tracking deviation and the grid voltage.The effectiveness of the proposed method is verified by comparing the simulation results.
基金supported by the National Natural Science Foundation of China (Grant Nos.50977018,51107019)the Fundamental Research Funds for the Central Universities (Grant No.HIT.NSRIF.2010101)
文摘In order to improve the ability of harmonic suppression,and reduce the loss of switching devices,this paper proposes an active harmonic suppression method at dc side of multi-pulse rectifier(MPR) . The circulating current through secondary winding of active inter-phase reactor(AIPR) is derived from the current relation between the ac and dc sides of MPR when the threephase input currents are sinusoidal simultaneously,and an applicable circulating current is presented. According to the relation between voltage across secondary winding of AIPR and the applicable current,it is confirmed that harmonic energy of input line current can be consumed by the resistor in series with the secondary winding. A half-bridge PWM rectifier is designed to abstract the harmonic power and to feed the load,which can realize the recycling of harmonic energy. Experimental results show that the power factor of the proposed system is approximately equal to one when the PWM rectifier operates normally,and that the proposed system has the ability of anti-variation of load and input voltage.
