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Mitigation of the Harmonics is one of the major needs for an ideal power system and it is demanded that it should ideally provide a balanced and pure sinusoidal three phase voltage of constant amplitude to the loads. This paper deals with split phase(2C),4-leg and three single phase H-bridges. The performance of all three topologies under an unbalanced non-linear load conditions evaluated with a detailed...
For large quantities of harmonic problems in power system, active power filter is one of the most effective ways to solve the problems. FBD harmonic current detection method is used in three-phase three-wire shunt active power filter to compensate grid harmonics. FBD current detection method is analyzed from theoretical view and compared with another method. The shunt active power filter system is...
A Hysteresis current control (HCC) modulation is commonly used because of its various advantages. However, the HCC modulation has the disadvantage that the modulation frequency varies in a fixed band and, consequently, produces non-optimum current ripples. To overcome this drawback, an adaptive hysteresis-band current control (AHCC) modulation has been suggested. However, when the AHCC is employed...
Algorithms are well presented for estimation of harmonics and their elimination in a three phase system for power quality improvement. This paper presents the application of KF-Adaline Algorithm for estimation of power system harmonics and shunt active power filter with hysteresis current controller based on space vector modulation for perfect elimination of harmonics. The space vector modulation...
The active power filter (APF) is well known as a harmonic suppressor and reactive power compensator with the best performance in the power system recently. Based on fuzzy control logic, this paper presents a variable step-size digital low-pass filter algorithm with fuzzy self-tuning factor, as well as a novel hysteresis current control strategy with fuzzy bandwidth. As for harmonic detecting circuit,...
Accuracy and dynamic performance of Active Power Filter (APF) harmonic detection algorithm affect the effect of harmonic compensation directly. Commonly used harmonic current detection algorithms share the problem that certain hysteresis error and unsatisfactory dynamic performance. Harmonic current detection algorithm bases on instantaneous reactive power is analysed. Hysteresis error that affect...
This paper presents an experimental comparison of three current control techniques, namely Hysteresis, PI and Ramptime Current Control Techniques. The testing platform is a 300 W shunt active power filter with diode rectifier load. Results are analysed both in the time domain and the frequency domain. The pros and cons of each of the above mentioned current control techniques are discussed. It is...
A large variety of electronic circuits such as inverter, chopper, cyclo-converters, SMPS used by industrial and domestic purpose, the characteristics of such equipments are non-linear in nature. Due to non-linear characteristics the load current gets distorted which causes undesirable effects like heating, equipment damages, EMI effects etc. in power network. The active power filter (APF) is the best...
Shunt active power filters (APF) are widely used in power systems to eliminate the current harmonics and to compensate reactive power due to their accurate and fast operation. In this paper the instantaneous power theory is used to extract the harmonic components of system current. Then fixed-band hysteresis current control is explained. Because of fixed-band variable frequency disadvantages, the...
Power Distribution system is polluted by harmonic and reactive power disturbances due to the large usages of non-linear loads (Computers, Laser printers, SMPS, Rectifier etc.). Harmonics cause a number of undesirable effects like heating, equipment damage and Electromagnetic Interference effects in the power system. Active power filter (APF) or Active power line conditioner (APLC) is a suitable solution...
This paper present three-phase four-wire active filter for power line conditioning (PLC) to improve power quality in the distribution network. The active power filter (APF) is implemented with PWM based current controlled voltage source inverter (VSI). This VSI switching signals are generated through proposed three-level hysteresis current controller (HCC) that achieves significant reduction in the...
In this paper, a hybrid filter topology is proposed to minimize voltage harmonics, current harmonics and EMI noises in PMSM with hysteresis direct torque control (HDTC). The filter topology consists of IGBT active filter (AF), high frequency LC filter and trap filter. The coupling of the AF compensated voltage and the motor main voltage is achieved through series 1:1 transformer. The AF detects the...
This paper presents a new method for harmonic and reactive power compensation with an artificial neural network(ANN) controller and a new control algorithm for active power filter (APF) to eliminate harmonics and compensate the reactive power of three-phase thyristor bridge rectifier. The artificial neural network (ANN) current controller is adapted to active power filter (APF) and the current controller...
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...
In this paper, the three-phase four-wire active power filter based on a three-level neutral-point-clamped inverter is presented. The proposed active power filter and controller eliminate harmonics in all three phases as well as the neutral current. The existing neutral-point-clamped inverter for a three-phase three-wire system is used for the three-phase four-wire system since the split DC capacitors...
This paper presents a method for the harmonic and reactive power compensation with an adaptive hysteresis band current controller and a control algorithm for active power filter (APF) to eliminate the harmonics and compensate the reactive power in three-phase thyristor bridge rectifier. The adaptive hysteresis band current controller is adapted to the active power filter (APF). And it can change the...
Customary of standard control analysis, current control strategies are often tested and compared through applying a step change to the reference current to determine its performance under transients. However, the reality of a step event occurring in this manner for a real system seems unlikely. For a more realistic transient performance indication we should consider the active power filter (APF) application...
This paper presents in this study a control algorithm to compensate harmonic current and reactive power simultaneously in 3 phase, where 3-wire and 4-wire non-linear loads. If the utility voltage is distorted, active power filter (APF) allows similar level of distortion in the compensated source current. Therefore, the resultant source currents have the same waveform as that of the supply voltage,...
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