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This paper presents a harmonic suppression control strategy under unbalanced point of common coupling (PCC) voltage for modular multilevel converter based shunt active power filter (MMC-SAPF). Harmonics are extracted by multiple synchronous reference frame (MSRF) algorithm to generate the compensation current references of positive- and negative-sequence control for MMC-SAPF. The proposed independent...
Three-phase three-wire shunt active power filter (SAPF) with traditional positive-sequence control can only compensate part of the nonlinear load current harmonics if the PCC voltage changes from balanced to unbalanced condition. Changes of both nonlinear load current harmonic components and equivalent circuit for modular multilevel converter based SAPF (MMC-SAPF) are analyzed in the paper. To solve...
With the increasing use of non-linear loads, the harmonic problems have become of great concerns. One of the solutions to harmonics is the application of shunt active power filters (APFs). The APF reference compensation strategy proposed in this paper adopts the backpropagation neural network (BPNN) to train the control algorithm and calculate the reference compensation current under steady state...
The most practiced and acceptable approach to improve the power quality of distorted distribution networks is to install active power filters (APFs) at the point of common couplings (PCCs) of nonlinear loads. This approach has proven to be very effective since APFs fully compensate for the injected current harmonics at the PCCs that will effectively result in negligible voltage total harmonic distortion...
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...
This paper proposes a conductance emulation based scalar control for shunt active power filter to compensate customer generated current harmonics and reactive power. Proposed technique emulates the combination of nonlinear load and shunt active filter as an equivalent conductance across the source voltage. If the utility voltage is sinusoidal, the shunt active filter compensates total current harmonics...
Three-phase shunt active power filter (APF) is 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...
This paper presents an approach of incorporating hardware-in-the-loop simulation and ADALINE for shunt active power filter (APF) design. Even when the three-phase source voltages are unbalanced and/or distorted and supply to a nonlinear load, the described compensation strategy can compensate the harmonic and neutral current, and thus improve the power factor. After verifying the efficiency of compensation...
This paper discusses a modular structure multilevel inverter (MSMI) with a unified constant frequency integration control (UPC) which is used as an active power filter (APF). APF is connected in shunt to the power system in order to sense the non-sinusoidal current drawn by the non-linear load and inject current to the transmission line which compensates the harmonics drawn by the load. This in turn...
This paper presents and compares the performance of two controllers namely Fuzzy Logic and Proportional Integral applied to a voltage source inverter/converter operating as an active power filter. The active power filter is operated to compensate harmonics and reactive power generated by the non-linear load and power factor correction simultaneously. This work is performed in order to make an accurate...
In this paper a novel sliding mode control approach is presented for a medium-high voltage hybrid shunt active power filter, the harmonics suppression effect of which is restricted by the switching frequency of power semiconductor devices, and EMI caused by which is also related with the switching frequency nearly. The proposed control approach combines state variables tracking with PWM, in which...
Active Power Filter (APF) is usually used to compensate the harmonic currents which are generated by the nonlinear load, and its compensation performance mainly depends on the estimation of APF mathematic model, instruction signal of harmonic currents and design of controller. Traditional control APF uses the average mathematic model, and PI controller and its instruction signal of harmonic currents...
Active Power Filter (APF) is useful device to compensate the harmonics which are caused by the nonlinear load, and its performance index mainly depends on the parameter design and structure of controller. In order to solve this problem, new Hamilton model of active power filter is introduced and the Energy Shaping Control Principle is used to design controller which corrects the output current waveform...
Active power filter is an advanced power electronic device, which can be used for integrated compensating harmonics and improving power quality. A shunt active power filter using for three-phase four-wire system is introduced in this paper. The basic operation principles and structure are analyzed. This paper proposes the design of a shunt active power filter, which can be used under the condition...
This paper presents a complete strategy for harmonics identification and neural control of a three-phase voltage inverter used for the power active filtering. Based on the use of neural techniques, this approach of compensation is done in two stages. The first stage extracts the harmonic currents with the diphase currents method by using Adaline neural networks. The second stage injects the harmonic...
This paper presents an investigation on influence of the control system time delay on the performance of the shunt hybrid power filter, consisting of a shunt passive filter connected in series with an active power filter. Frequency response of the shunt hybrid power filter is investigated by mathematical analysis and it is shown that existence of controller time delay degrades the harmonic compensation...
The main purpose of this paper is the evaluation of the shunt active power filter apparent power ratio between the apparent power generated by the source power system to the load and the compensation apparent power produced by the shunt APF to force the currents circulating toward the source to be sinusoidal and balanced. This ratio allows defining the compensations capability for different perturbations...
This paper deals with a harmonic filter to eliminate source current harmonics in power system. It is a combination of shunt passive filter and series active filter. The main section of the active power filter, a voltage source inverter, is connected between AC source and nonlinear load through a series transformer. Current harmonic compensation is achieved by injecting equal fundamental current instead...
This paper presents an investigation on influence of the control system high pass filter characteristics on the performance of the shunt hybrid power filter. The power filter is consisting of a shunt passive filter connected in series with an active power filter. Frequency response of the shunt hybrid power filter, tacking into account the effect of high pass filter (used in control system for extracting...
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