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This paper develops the N-paralleled converters with LCL filter system model and expands the virtual resistor control method for harmonic current control. Power electronic converter can be controlled as a current source. For some application the current source can be used to test the inductor characteristic, such as temperature rise, noise or vibration. While in some cases, several converters are...
Three-phase shunt Active Power Filters (APFs) are connected to the grid through inductance or LCL filter. Comparing to single L filter, LCL filter is more effective, e.g. better switching harmonics suppression and lower output impedance, but such solution causes stability problems. In order to assure stable operation either a damping resistor or active damping algorithm has to be used. However, extra...
In this paper, the generation and path of conductive EMI in an active power filter (APF) are analyzed and the method to suppress the noise is presented. APF is a kind of PWM converter, which aims at solving the harmonic problem originated by nonlinear-load in power system. As compensating the low frequency harmonic components, it also generates electromagnetic noise in high frequency band. Following...
This paper presents a new parallel hybrid active filter topology which can reduce the VA rating of the active power filter (APF) greatly. Three different control methods are proposed for the new topology. This paper makes descriptions on the compensation characteristics of this hybrid filter, based on its control method and operation principles. The steady state characteristic curves are obtained...
Active power filter (APF) is one of major power quality controllers to deal with harmonics issues. It can compensate the low frequency harmonic components in power system by using PWM method. But, being a kind of switching power converter, APF will generate electromagnetic noise in high band. In this paper, the mechanism and path of two kinds of noise are analyzed and an EMI filter is designed to...
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