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This paper describes the design and performance of a parallel hybrid active power filter integrated into a three-phase diode rectifier with a capacitive load. The hybrid filter is composed by a three-phase LC filter and a small rated active filter based on a three-phase voltage-source PWM converter. The passive filter is designed with focus on characteristic impedance, resonant frequency, influence...
This paper analyzes the stability problem of the grid-connected voltage source inverter (VSI) with LC filters, which demonstrates that the possible grid-impedance variations have a significant influence on the system stability when conventional proportional-integrator (PI) controller is used for grid current control. As the grid inductive impedance increasing, the low-frequency gain and bandwidth...
This paper presents a direct peak dc-link boost voltage PID-like fuzzy controller in Z-source inverter. With this technique a constant peak dc-link voltage can be achieved with an excellent transient performance which enhances the rejection of disturbance, including the input voltage and load current variation, and solves the problem of the local dynamic output feedback stabilization of the serious...
A feedforward compensator applied in Z-source inverter ASD system has been presented. With this technique a constant peak dc-link voltage can be achieved with an excellent transient performance which enhances the rejection of input voltage ripple, and have good ride- through for voltage-sags. The effect of six pulse input voltage ripple which result from front-end diode rectifier has been described...
This paper presents the analysis of dynamic response of the ZVS Z-source rectifier and design of the closed-loop controllers for both the z-source rectifier and the z-network circuit. Due to the unique Z-network, the transient response is found to be challenging in controlling the ZVS Z-source rectifier. By combining the traditional PWM rectifier model and equivalent model of the z-network, The ZVS...
This paper proposed an accurate analytical method to calculate the current harmonic components of uncontrolled rectifiers. These analyses are greatly simplified through superposition method. All the calculations are purely algebraic, with high accuracy. The validity of the proposed method is demonstrated by comparison with the results of time-domain simulation. Therefore, choice of power compensation...
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