Effective approach to analogue filter design dedicated to current harmonics reduction in nonlinear circuits

2011 ◽  
Author(s):  
Przemyslaw Janik
Keyword(s):  
Filter Design ◽  
Nonlinear Circuits ◽  
Current Harmonics ◽  
Analogue Filter

Decoupled Control Strategy of Grid Interactive Inverter System with Optimal LCL Filter Design

2013 ◽  
Vol 14 (5) ◽  
pp. 477-486 ◽  
Author(s):  
B. Chitti Babu ◽  
Anup Anurag ◽  
Tontepu Sowmya ◽  
Debati Marandi ◽  
Satarupa Bal
Keyword(s):  
Control Strategy ◽  
Reactive Power ◽  
Filter Design ◽  
Dynamic Performance ◽  
Harmonic Distortion ◽  
Voltage Source ◽  
Lcl Filter ◽  
Current Harmonics ◽  
Switching Losses ◽  
Active And Reactive Power

Abstract This article presents a control strategy for a three-phase grid interactive voltage source inverter that links a renewable energy source to the utility grid through a LCL-type filter. An optimized LCL-type filter has been designed and modeled so as to reduce the current harmonics in the grid, considering the conduction and switching losses at constant modulation index (Ma). The control strategy adopted here decouples the active and reactive power loops, thus achieving desirable performance with independent control of active and reactive power injected into the grid. The startup transients can also be controlled by the implementation of this proposed control strategy: in addition to this, optimal LCL filter with lesser conduction and switching copper losses as well as core losses. A trade-off has been made between the total losses in the LCL filter and the Total Harmonic Distortion (THD%) of the grid current, and the filter inductor has been designed accordingly. In order to study the dynamic performance of the system and to confirm the analytical results, the models are simulated in the MATLAB/Simulink environment, and the results are analyzed.

Filter design at the output of the inverter in PMSM drives

2017 ◽  
Vol 36 (1) ◽  
pp. 364-377 ◽  
Author(s):  
Guangming Zhang ◽  
Xiaojun Liu ◽  
Lei Mei ◽  
Huimin Ouyang ◽  
Xin Deng
Keyword(s):  
Filter Design ◽  
Permanent Magnet Synchronous Motor ◽  
Torque Ripple ◽  
Phase Voltage ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Content Type ◽  
Current Harmonics ◽  
Characteristics Analysis ◽  
Low Pass

Purpose This paper aims to describe a simple low-pass filter to suppress torque pulsation and current harmonics in permanent magnet synchronous motor (PMSM) drives. Design/methodology/approach For the control of the PMSM, a field-oriented control algorithm is always used. The proposed filter is actually a resistance, inductance, capacitance (RLC) filter. At the output of the inverter and the input of PMSM, an RLC filter is connected. This filter suppresses current harmonics through filtering phase voltage harmonics. Analysis of the filter is achieved through frequency characteristics analysis. Findings This filter can effectively filter out the harmonic of phase voltage. Both the simulation and experiment results show that the proposed filter can effectively suppress torque pulsation and current harmonics in PMSM drives. Also, the method of selecting filter parameters and the whole control system are very simple. Research limitations implications The filter increases the design cost of the system. Practical implications The harmonics and torque ripple of phase current are greatly suppressed. Also, the loss of the PMSM reduced. Originality/value The method of selecting filter parameters and the analysis of the proposed filter are proposed for the first time.

Quasi-Newton Method for DSPSL Bandpass Filter Design

2011 ◽  
Vol 219-220 ◽  
pp. 778-781
Author(s):  
Shan Wang
Keyword(s):  
Neural Network ◽  
Newton Method ◽  
Bandpass Filter ◽  
Filter Design ◽  
Nonlinear Circuits ◽  
Analysis Techniques ◽  
The Neural Network ◽  
Electro Magnetic ◽  
Quasi Newton ◽  
Good Agreement

A method based on neural-network is developed and applied to analyze the DSPSL filter design. Through the neural network analysis of nonlinear circuits, it can enhance the efficiency of electro-magnetic (EM) analysis techniques for DSPSL filter design. Quasi-Newton method is adopted, which has shorter training period and the faster convergence. A good agreement between ANN results and EM simulations verifies the validity of this proposed MLPNN model.

scholarly journals Simulation of passive filter design to reduce Total Harmonic Distortion (THD) in Energy-Saving Lamps (LHE) and Light Emitting Diodes (LED)

2021 ◽  
Vol 878 (1) ◽  
pp. 012059
Author(s):  
F Susanto ◽  
E M Silalahi ◽  
S Stepanus ◽  
B Widodo ◽  
R Purba
Keyword(s):  
Energy Saving ◽  
Light Emitting Diodes ◽  
Filter Design ◽  
Harmonic Distortion ◽  
Matlab Simulink ◽  
Current Harmonics ◽  
Light Emitting ◽  
Passive Filter ◽  
Linear Load ◽  
Non Linear Load

Abstract This paper discusses the design of a passive filter system for Energy-Saving Lamps (LHE) and Light Emitting Diodes (LED) using the MATLAB Simulink software. This type of lamp is a type of non-linear load that produces harmonics of current and voltage. However, this harmonic problem can be reduced using passive filters. To determine the size of the passive filter components, research was carried out in the form of measurements of power, power factor, voltage, current, THDi and THDv produced by the LHE and LED. The results of these measurements were simulated using MATLAB Simulink to determine the passive filter design that reduces the THD value on the LHE and LED. To reduce the level of current harmonics, a single tuned LC passive filter was designed. The filter, designed to work at a frequency of 50 Hz and is expected to reduce the level of harmonics in the 3rd, 5th, 7th, 9th, 11th harmonic orders so that the THD produced by LHE and LED meets the IEEE 519-2014 standards. The simulation results of single tuned LC passive filter design can reduce THDi by 46.78% from the initial THD of 84.55% so that it becomes 37.77%.

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