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Compared with the filter, the filter is more suitable for high-power low-switching-frequency applications due to its better attenuation characteristics on high frequencies. However, the parameter design for the filter is more complex since both the inhibiting effect of the high-frequency harmonic current and the influence to the controller response performance of the converter should be...
This paper concentrates on a new high-order output filter, named LLCL filter, and its application issues on the three-phase three-wire shunt active power filter (SAPF). The LLCL topology is constructed by replacing the capacitor of the traditional LCL filter with an LC branch that resonant at the switching frequency. The SAPF with an LLCL filter exhibits excellent switching frequency harmonic attenuation...
In this paper, the harmonic compensation characteristics of APFs to nonlinear loads are investigated by a circuit equivalent method based on impedance analysis. It is found that the ac-side harmonic current of voltage source type nonlinear load (VSNL) will be amplified seriously when it is compensated by shunt APF, and the ac-side harmonic voltage of current source type nonlinear load (CSNL) will...
In order to improve the accuracy of the harmonic current compensation for the single-phase shunt active power filter, a compound control strategy is proposed with the PI control and repetitive paralleling based on the stationary frame, PI control is used to guarantee the system dynamic performance, the repetitive control is to improve the output current tracking accuracy for the load harmonic current...
Capacity proportion frequency allocation compensation parallel control strategy based on the multiple synchronous rotating reference coordinates control is proposed to overcome difficulties in the field of high power application. The zero steady-state error compensation is implemented and the overall stability of the system may be improved by the multiple synchronous rotating reference coordinates...
Three-phase shunt active power filter (APF) is often used to compensate the harmonics and reactive current derived from nonlinear loads. But many non-ideal factors, such as the limited bandwidth of current control loop and the time lag of signal acquisition and reference current generation etc, will deteriorate the compensation effect. The traditional proportion-integral (PI) controller cannot be...
Active power filter(APF) based on power electronic technology is currently considered as the most competitive equipment for mitigation of power harmonics.Usually, the configuration of APF is referred to one based on voltage source inverter due to easy implementation.Researches on APF mainly focus on two fields: topologies and control strategies. The topology of APF is decided in the harmonics current...
In practical industry fields, harmonic, negative sequence current and reactive current need to be restrained to meet the requirements of consumers. The active power filter is a new brand power electronics device. In the three-phase unbalanced circuit, it can restrain the negative sequence fundamental current except for restraining harmonic. In order to restrain harmonic and negative sequence fundamental...
To solve the problems caused by unbalanced load in industrial fields, two novel methods to extract harmonic current and reactive current and a 2/2 transformation matrix are proposed based on instantaneous power theory, enabling APF to extract base positive sequence current, base negative sequence current and other high order harmonic current correctly and timely, thus we can choice compensation strategy...
Three-phase shunt active power filter (APF) are often used to compensate the harmonic and reactive current derived from non-linear load. But many non-ideal factors, such as the limited bandwidth of output current loop and the time lag of signal sensing circuit and reference current generation etc, will deteriorate the compensation effect. Proportion-integral (PI) controller cannot be used simply to...
A three-phase three-wire shunt active power filter (APF) suitable for parallel operation is proposed in this paper to overcome difficulties in the field of high power applications. This APF can operate independently and compensate the load harmonic current according to its own capacity-limitation. Furthermore, the output current of each APF is optimized so that the APF with large capacity compensates...
A three-phase three-wire shunt active power filter (APF) suitable for parallel operation is proposed in this paper to overcome difficulties in the field of high power applications. This APF can operate independently and compensate the load harmonic current according to its own capacity-limitation. Furthermore, the output current of each APF is optimized so that the APF with large capacity compensates...
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