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Reference current play a decisive role in power quality control algorithm. In this paper, introduce the principle of six reference current extracting methods in time domain, and applying MATLAB/Simulink software to simulate in eight conditions. The results shown that p-q theory method have a high power factor(PF) three-phase balance and harmonic suppression; Fryze-Buchholz-Depenbrock(FBD) method have...
Currently, delayed signal cancellation (DSC) is the most popular and widely used technology owing to its robust performance and effectiveness, however, there are time delay in transient response. This paper proposed a method to choose delay factors of cascaded delayed signal cancellation-PLL (CDSC-PLL), which fast convergence and can extract fundamental frequency positive sequence(FFPS) in diode rectifier...
This paper proposed a novel topology, which series inverter and shunt inverter both have capacitors in DC links, and connected by a resistor. And then establish mathematical model and control transfer function. At last compare the performance of traditional UPQC, separate UPQC and proposed UPQC in sag, harmonic and unbalance condition. The results shown that the proposed topology have a great performance...
3D-SVPWM algorithm is used for synthesizing the desired bridge output voltage and generating compensation currents to cancel the harmonics. In this paper, depict the detail step for calculate the command vector and duty cycle of each leg in three level 3-phase 4-wire shunt active power filter system. After induction, proposed a simplified 3D-SVPWM algorithm. Compare to the traditional 3D-SVPWM algorithm,...
This paper establish the mathematical model of VIENNA rectifier in d-q synchronous reference frame, after analyzed the variables' relationship and all of the switches on-off states and then proposed a novel scheme for fast response of VIENNA rectifier. And transfer the result signal into a-P coordinate to analyze the relationship of the signal. At last changing the components to achieve faster response,...
In the engineering field, many motion's tracks are too complicated to be described in mathematical expression accurately, and solving this problem by using ADAMS. In this paper, parameters analysis and data processing were discussed based on the analysis of simulation animation and measured curve according to the characteristics of the model, to ensure the accuracy of results. A reasonable track curve...
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