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In this paper, a new algorithm of Mode Decomposition Variational (VMD) for the detection of harmonics is proposed for the first time, and it is applied to the active power filter(APF). VMD decomposes the distorted power signal into a series of intrinsic mode functions (IMF), and different IMF components represent different frequency components, so that the fundamental IMF component can be determined...
The paper presents a single phase grid integration of a shunt connected Photovoltaic (PV) generator. The objective of the proposed system is to provide uninterrupted power supply to the load during both strong sunlight as well as at night or at cloudy conditions. The interface between the grid and the PV is carried out through a Voltage Source Inverter (VSI), eliminating the current harmonics and...
In this paper the mathematical morphology theory is applied to implement the instantaneous power p-q control strategy of a shunt active power filter. A computer-aided modeling of the active power filter operation using the MATLAB/Simulink environment is presented in details. The simulation results indicate that the implemented control strategy is able to completely compensate the harmonic components...
In this paper, a novel control algorithm for three-phase four-wire shunt active power filter for the compensation of instantaneous harmonic current components in nonlinear loads is presented. Fundamental signal extraction is carried out using Harmonic Tuned Filter (HTF) without the Phase Locked Loop (PLL). HTF can efficiently determine the fundamental signal components from distorted voltage or current...
In this paper, a novel control algorithm for three-phase four-wire shunt active power filter is proposed without measuring load and filter current with different load condition is proposed. The control theory and reference source current signal generation is based on Instantaneous Reactive Power theory. The idea is different from the conventional control approach based on sensing load and/or compensator...
This paper represents a novel reference compensation current estimation method for control of shunt active power filter (APF). The method allows the reference compensation currents are determined in the a-b-c reference frame and there is no reference frame transformation requirement, so the proposed system becomes very simple. The current control is done in time domain. The compensating current flows...
The configuration and principle of shunt active power filter is introduced briefly in this paper. A digitally controlled shunt active power filter based on double DSP is designed for the three-phase four-wire system. The main circuit of the shunt active power filter selects a four-leg voltage-source inverter, and a dynamic hysteresis-band current control is used to track the current. A control strategy...
This paper presents a new method for harmonic and reactive power compensation with power factor improvement using an artificial neural network (ANN) and a new control algorithm for active power filter (APF) for power quality conditioning for variable load under non-ideal mains voltage conditions. The neural network controller comprises two similar adaptive linear neurons (ADALINE), and it has been...
Parallel Active Power Filter(APF) is a new type of power electronic device which is used to suppress harmonic and compensate reactive power. The traditional active power filter has bad harmonic current detection accuracy and real-time in the detection circuit and slow current tracking speed in control circuit. Owing to these shortcomings, we put forward an improved ip, iq harmonic detection method,...
In order to meet the real-time requirement of active power filter harmonic current detecting, a digital computing method based on instantaneous reactive power theory was presented. It was shown that this method was easily realized and has high real-time response performance. Its special software and hardware based on DSP was also developed according to this arithmetic. In the end its efficiency and...
To extract a single order harmonic component from single phase voltage or current is a difficult work by the existed instantaneous reactive power theory, which is dominant in the detection of the total harmonic components in three-phase system. A novel detection approach of single order harmonic in single-phase system based on discrete Fourier transformation with smooth moving window is discussed...
Active power filter is an important device in eliminating harmonic pollution and the key problem in APF is how to detect the harmonic current accurately. In this paper a mathematical morphology algorithm for random harmonic current detection is presented. This algorithm which is based on instantaneous reactive power theory can detect positive and negative sequence component of random harmonic current...
With the proliferation of nonlinear loads as power electronics equipment, the disadvantage of harmonics is more and more, which influence quality of power grid. Active power filter is a new harmonics restraint method comparing with passive filter, which is a power electronics device. This paper inspects harmonics current based on three-phase circuit instantaneous reactive power theory and simulates...
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 shunt active power filter application mainly for source current harmonic elimination. The proposed control method is based on instantaneous reactive power theory. A three-phase voltage source inverter bridge with a dc bus capacitor is used as an APF. It requires measuring the source currents with reduced number of current sensors than the existing methods. The source currents...
Active power filter is a kind of device used for harmonics current detecting and reactive power compensation of three-phase power network. The compensating characters of active power filter depend on precision and real-time of harmonics and reactive power current detection. In this paper, instantaneous reactive power theory of three-phase four-wire system is introduced firstly, and the principle of...
With the continuous development of water-saving irrigation, agricultural productpsilas deep process, greenhouse control in the agriculture, more and more variable frequency equipments, rectifier devices and other power electronic equipments have been used. But owing to the use of these equipments, harmonic pollution problem in power grid is more serious. Active filter is an effective method to the...
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