Embedded System Implementation of Shunt Active Power Filter with Direct Compensation Component Generation Using Linear Operational Amplifiers

2020 ◽  
Vol 29 (10) ◽  
pp. 2050166
Author(s):  
S. Kumaresan ◽  
H. Habeebullah Sait
Keyword(s):  
Embedded System ◽  
Pulse Width Modulation ◽  
Low Cost ◽  
Reference Signal ◽  
Active Power Filter ◽  
Active Power ◽  
Operational Amplifiers ◽  
Shunt Active Power Filter ◽  
Power Filter ◽  
The Embedded System

In this paper, the principles, the design, the methodology of low cost implementation and the results of implementation of a shunt active power filter (SAPF) in the embedded system environment are presented. The system for which the SAPF is considered has a combination of linear reactive load and a three-phase-fed diode bridge rectifier that drives an RL load. The generation of the compensating signal or the reference signal is based upon the direct calculations implemented using the linear operational amplifiers. Further, the generation of the pulse width modulation (PWM) pulses is much similar to the conventional sinusoidal PWM but implemented in the embedded system platform. In this work, the built-in PWM and ADC sections of the microcontroller PIC 16F877A have been utilized for generating the PWM pulses without the requirement of an explicit carrier signal. The proposed method has been validated in MATLAB SIMULINK environment and also by an experimental prototype.

Five-Level Cascaded H-Bridge MLC-Based Shunt Active Power Filter for Active Harmonics Mitigation in Distributed Network

2018 ◽  
Vol 28 (02) ◽  
pp. 1950035 ◽  
Author(s):  
Jitendra Tandekar ◽  
Amit Ojha ◽  
Shailendra Jain
Keyword(s):  
Pulse Width Modulation ◽  
Average Power ◽  
Active Power Filter ◽  
Active Power ◽  
Shunt Active Power Filter ◽  
Harmonic Compensation ◽  
Current Harmonics ◽  
Power Filter ◽  
Power Quality Improvement ◽  
Real Time Digital Simulator

This paper presents an investigation on mitigation of current harmonics, using Cascaded H-bridge Multilevel Converter (CHB-MLC)-based Shunt Active Power Filter (SAPF). Development and analysis of SAPF for harmonic compensation in distribution network for power quality improvement has been discussed. In the proposed work, transformer-less CHB MLC is used which reduces weight and cost of the system. Moreover, a novel controller based on average power method is adopted for generation of compensation active filter current. In order to generate switching signals, multi-carrier Alternate Phase Opposition Disposition (APOD) — Pulse Width Modulation (PWM) schemes are used. The proposed CHB-MLC SAPF reduces the source current THD below 5%. The results are simulated in MATLAB/Simulink and demonstrate the effective mitigation of current harmonics with APOD-PWM schemes. Opal-RT OP4500 real-time digital simulator is used to validate the proposed scheme under different steady state and transient conditions.

Shunt Active Power Filter with Solar Photovoltaic System for Long-Term Harmonic Mitigation

2019 ◽  
Vol 29 (05) ◽  
pp. 2050081
Author(s):  
P. Suresh ◽  
G. Vijayakumar
Keyword(s):  
Distribution Systems ◽  
Reference Signal ◽  
Active Power Filter ◽  
Active Power ◽  
Energy Output ◽  
Solar Photovoltaic ◽  
Shunt Active Power Filter ◽  
Power Filter ◽  
Harmonic Mitigation

This paper proposes a shunt Active Power Filter (APF), supported by Solar Photovoltaic (SPV) system for a grid-connected application that improves power quality. The reference signal for the shunt APF is obtained from the adaptive Proportional Integrative Derivatives (PID), based on an algorithm of Least Mean Eighth (LME) with Unit Vector Template (UVT). The LME algorithm distinguishes the basic weight sections from load currents and estimates the three phase reference source current. These reference currents are used to generate a gate signal for the shunt APF. The DC-link voltage regulator is used to keep the constant DC-link voltage of the shunt APF with an APID controller. To reduce present distortions of electric power distribution systems, a design of a suitable controller is conducted using an intelligent computational technique for predicting the right reference signals. The SPV scheme is designed to obtain the highest energy output from the SPV panel with the maximum power point tracking algorithm (MPPT) scheme and is connected to the power grid. For long-term harmonic mitigation, the SPV system continuously maintains the DC-link of the shunt APF. Mathematically, the presented current reference signal generation scheme is examined and digital simulation outcomes are displayed under distinct steady and dynamic state conditions. Lastly, the complete scheme is validated by using the hardware prototype.

Three-phase four-wire shunt active power filter working simultaneously as energy conditioner

2017 ◽  
Vol 36 (3) ◽  
pp. 702-715 ◽  
Author(s):  
Andrzej Szromba
Keyword(s):  
Control Method ◽  
Reference Signal ◽  
Active Power Filter ◽  
Active Power ◽  
Active Filter ◽  
Supply Source ◽  
Shunt Active Power Filter ◽  
Content Type ◽  
Power Filter ◽  
Three Phase

Purpose The purpose of this study is to find a control method for three-phase four-wire shunt active power filters, which uses a load-equivalent conductance for obtaining a reference signal for compensating non-active current. Design/methodology/approach Changes of energy stored in an active filter’s reactance elements are monitored to find the active component of the load current. It is then used as a current reference to be realised as a supply source current. Computer simulation methods were used to verify the presented control method. Findings To calculate the reference signal for the active filter action, it is enough to measure the active filter’s DC-side capacitors’ voltages. It has been proved that P regulators are sufficient to realise compensating current and to stabilise active filter capacitors’ voltages. The supply source-neutral conductor current can be zeroed even for nonlinear and unbalanced load-generating DC-component in its neutral conductor. In addition, the active filter can buffer load-active power changes and act simultaneously as a local energy accumulator. Originality/value This paper provides an alternative approach to address the problem of the three-phase four-wire shunt active power filter control methods.

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