Series Hybrid Active Power Filter Research Articles

An Improved Control Method of DC Voltage for Series Hybrid Active Power Filter

DC voltage is one of the important parameters of active power filters. Since the series hybrid active power filter does not withstand the fundamental voltage, it cannot absorb energy from the power grid, making it too difficult to control its DC voltage. In order to solve the DC voltage control problem, an improved control method for the series hybrid active power filter with magnetic flux compensation is proposed in this paper. In this improved method, the fundamental magnetic flux compensation coefficient is equal to 1, meeting the condition of fundamental magnetic flux compensation. This improved method does not rely on the precise detection and phase-locking of the fundamental voltage at the port of the series transformer. A phase-fixed active current component is generated directly by the inverter, enabling the active power filter (APF) to absorb active power from the power grid. Consequently, the active power absorbed by the APF from the power grid has a linear relationship with the active current component. Both simulation and experimentation verified the correctness and effectiveness of this proposed method.

A Grid-Connected Solar PV/Wind Turbine Based Hybrid Energy System Using ANFIS Controller for Hybrid Series Active Power Filter to Improve the Power Quality

The current needs of more nonlinear loads and the frequent usage of single-phase loads in three-phase system drastically create power quality issues in the grid-connected system. As a consequence, it creates an undesirable power quality issue (PQI) in the form of a change in the nature of voltage and current magnitude and waveforms in the power system. The voltage-related PQI leads to a huge disturbance in the system when compared with the current-related PQI. The hybrid series active power filter provides grids with the required voltage in series and suppresses the voltage-related harmonics caused by grid-connected nonlinear loads. The present work deals with an adaptive neurofuzzy inference system controller for the generation of a reference voltage signal that uses a reduced active filter rating. The simulation study was done in the MATLAB 2020b/Simulink environment and the experimental effectiveness of the proposed ANFIS controller was compared with that of a conventional controller. In the grid-connected system, this system prevents voltage quality problems such as voltage sag, flickering, voltage swell, neutral currents, and reactive power. The renewable energy sources interfaced into the DC-link minimize short and long voltage challenges so that they improve the overall performance of the system. In accordance with IEEE standard 519-1992, a prototype model was proved to demonstrate that the power delivery system works effectively under different conditions and reduces the total harmonic distortion by approximately 30%, which is less than the 5% acceptable limit.

Distribution system power quality compensation using a HSeAPF based on SRF and SMC features

The purpose of this paper is to describe the design of a Hybrid Series Active Power Filter (HSeAPF) system to improve the quality of power on three-phase power distribution grids. The system controls are comprise of Pulse Width Modulation (PWM) based on the Synchronous Reference Frame (SRF) theory, and supported by Phase Locked Loop (PLL) for generating the switching pulses to control a Voltage Source Converter (VSC). The DC link voltage is controlled by Non-Linear Sliding Mode Control (SMC) for faster response and to ensure that it is maintained at a constant value. When this voltage is compared with Proportional Integral (PI), then the improvements made can be shown. The function of HSeAPF control is to eliminate voltage fluctuations, voltage swell/sag, and prevent voltage/current harmonics are produced by both non-linear loads and small inverters connected to the distribution network. A digital Phase Locked Loop that generates frequencies and an oscillating phase-locked output signal controls the voltage. The results from the simulation indicate that the HSeAPF can effectively suppress the dynamic and harmonic reactive power compensation system. Also, the distribution network has a low Total Harmonic Distortion (< 5%), demonstrating that the designed system is efficient, which is an essential requirement when it comes to the IEEE-519 and IEC 61,000–3-6 standards.

Improvement of Power Quality using a Robust Hybrid Series Active Power Filter

In this paper we are going to see how the DSM PI controller is used to reduce the harmonics in faster. DSM PI controller steps up the voltage to required level. The main aim is to improve the total harmonic distortion. Keywords: Shunt active filter, hybrid active filters, DSM PI controller

An improved control algorithm for Series Hybrid Active Power Filter based on SOGI-PLL under dynamic load conditions

An expansion in the single-phase and non-linear load of domestic, industries and small businesses scale utilize this 3-phase distribution, resulting in an unwanted harmonic current flowing through the grid. The quality of the current produced is too noisy for our liking results in reduces the system performance and power quality issues. Hence, in this study, an improved control algorithm is suggested for Series Hybrid Active Power Filter (SHAPF) performs more accurate dynamic compensation under distorted changes in load. The proposed Second-Order Generalized Integrator (SOGI) controller accurately identifies the phase angle variation under the operation of non-linear and single-phase loads in a three-phase system. Thus, it eliminates harmonics in the system; it is having the ability to control injected and source voltages. It also focuses on harmonics, voltage sag, swell, voltage unbalance, and neutral current issues throughout the transformer's life. To prove that the system is functional, the solar photovoltaic system is put in place. The solar power interfaced with the DC-link compensated for the issues of short and long-term voltage interruptions effectively. The prescribed controller's performance is examined in MATLAB 2020b/Simulink environment and hardware prototype model under dynamic load conditions in a 3-phase 4-wire distributed system. The experimental results reveal that the SOGI controller diminishes the Total Harmonic Distortion (THD) value of around 30%, which improves the system's stability and performance.

An Intelligent PI Controller-Based Hybrid Series Active Power Filter for Power Quality Improvement

The quality of power that is degrading day by day is an important issue for all the consumers. The important factor for this is harmonics in the voltage and current waveforms which can be resolved by the use of hybrid series active power filter. The combination consists of a series active power filter and a shunt passive filter connected in parallel to the load. The method used in this paper is for the purpose of achieving good harmonic compensation and reduced total harmonic distortion for various types of nonlinear loads as per the standards of IEEE 519. The proposed HSAPF technique uses the synchronous reference frame method for generating the compensating signal with an intelligent PI controller that uses particle swarm optimization (PSO) technique to obtain the required gain values needed to improve the steady state response of the system. The concept of vigorous HSAPF has been authenticated through MATLAB simulation analysis, and the results obtained validate the accuracy of the method for the different load conditions.

Renewable Energy–Supported Hybrid Active Power Filter for Grid-Connected Application

Abstract This research article presents a Photovoltaic (PV) and battery-supported Series Hybrid Active Power Filter (SHAPF), which includes a series APF (SAPF), parallel-connected passive filter, and PV system with a battery energy storage unit. The PV-supported SHAPF provides compensation against the voltage harmonics, current harmonics, and voltage interruption for a whole day. The SHAPF systems need certainty in order to provide active power to the power system to maintain the load voltage level during voltage sag. Conventionally, the SAPF has the capacity to compensate for a limited amount of active power in the system. Thus, additional energy sources need to be added into the dc link of the SAPF. The proposed SHAPF circuitry utilizes the renewable energy source with an energy storage unit to meet the dc-link voltage requirement of the SAPF. Additionally, it exports the power that is generated in the PV system to the load. The series inverter is used to supply part of or the entire reactive power required by the load along with compensating the sag and swell, supply voltage unbalance, and distortions. This is achieved by controlling the phase angle and the magnitude of series-injected voltage, which is called the power angle control method. The fuzzy logic controller-based power angle control method is employed to compensate the voltage-based disturbances in the distribution system. The performance of the PV and battery-supported SHAPF is evaluated by conducting MATLAB/Simulink simulation and experimental studies.

Fuzzy Sliding Mode Based Series Hybrid Active Power Filter for Power Quality Enhancement

This paper contributes an innovative gating signal generation technique based on fuzzy sliding mode pulse width modulation (FSMPWM) with a Series Hybrid Active Power Filter (SEHAPF) for reducing the total harmonic distortion (THD). Hybrid filters are used for compensating reactive power on the load side and mitigate harmonics for the growth of power quality under variable source and load conditions in the utility system. The objective of the paper is to eradicate the various power quality (PQ) problems with development in power factor and reducing distortion in transmission and distribution line due to harmonics. With the implementation of FSMPWM of the proposed filter, the gating pulses are generated by implementing a Mamdani fuzzy rule with sliding surfaces. For producing a fixed pulse the presented method reduces the chattering reaction by controlling the narrow boundary coating on the sliding surface. The results of the projected technique are analyzed and compared with the traditional hysteresis band current controller (HCC). The overall proficiency and results are examined with the help of MATLAB/SIMULINK environment.

Grid integration of renewable energy sources (RES) for power quality improvement using adaptive fuzzy logic controller based series hybrid active power filter (SHAPF)

Grid integration of renewable energy sources (RES) for power quality improvement using adaptive fuzzy logic controller based series hybrid active power filter (SHAPF)

Improved series active power filter with fundamental and harmonic magnetic flux hybrid compensation

The filtering performance of series hybrid active power filter (SHAPF) based on fundamental magnetic flux compensation positively correlates with the magnetising impedance of the transformer. However, excessive magnetising impedance will decrease reliability while increasing capacity and costs of the whole system. In order to reduce the magnetising impedance while ensuring the same filtering performance of SHAPF, an improved series active power filter (ISAPF) with fundamental and harmonics magnetic flux hybrid control is presented here. The equivalent impedances to fundamental and harmonics in ISAPF are firstly analysed to explain the principle of ‘harmonic isolation’. Then the range of compensation coefficients is investigated in detail based on the complete control block diagram and the open-loop function of ISAPF. Moreover, stability conditions of an overall system with non-linear loads are deduced. Finally, a set of single-phase prototype with two kinds of special transformer has been constructed; the related experiments results showed that ISAPF can ensure the filtering performance while applying a transformer with smaller capacity, thus resulting in the reduction in capacity and the costs while increasing the reliability.

Improvement of Power Quality Using a Robust Hybrid Series Active Power Filter

The degradation in power quality causes adverse economical impact on the utilities and customers. Harmonics in current and voltage are one of the most commonly known power quality issues and are solved by the use of a hybrid series active power filter (HSAPF). In this paper, a new controller design using sliding-mode controller-2 is proposed to make the HSAPF more robust and stable. An accurate averaged model of a three-phase HSAPF is also derived in this paper. The design concept of the robust HSAPF has been verified through simulation and experimental studies, and the results obtained are discussed.

Design of Passive Power Filter for Hybrid Series Active Power Filter using Estimation, Detection and Classification Method

Abstract This research paper discover the design of a shunt Passive Power Filter (PPF) in Hybrid Series Active Power Filter (HSAPF) that employs a novel analytic methodology which is superior than FFT analysis. This novel approach consists of the estimation, detection and classification of the signals. The proposed method is applied to estimate, detect and classify the power quality (PQ) disturbance such as harmonics. This proposed work deals with three methods: the harmonic detection through wavelet transform method, the harmonic estimation by Kalman Filter algorithm and harmonic classification by decision tree method. From different type of mother wavelets in wavelet transform method, the db8 is selected as suitable mother wavelet because of its potency on transient response and crouched oscillation at frequency domain. In harmonic compensation process, the detected harmonic is compensated through Hybrid Series Active Power Filter (HSAPF) based on Instantaneous Reactive Power Theory (IRPT). The efficacy of the proposed method is verified in MATLAB/SIMULINK domain and as well as with an experimental set up. The obtained results confirm the superiority of the proposed methodology than FFT analysis. This newly proposed PPF is used to make the conventional HSAPF more robust and stable.

Experimental Verification of Quasi Z-Source Inverter Based Hybrid Series Active Power Filter for Interconnection of PV into the Utility Grid

This paper proposes a Photovoltaic/Battery interfaced Quasi Z-source inverter based three-phase four-wire Hybrid Series Active Power Filter (HSAPF)to compensate the voltage and current related power quality problem in small distributed power system. The HSAPF consists of shunt passive filter and series active filterconsuming a battery. The shunt active filter mitigates the current harmonics generated by a nonlinear load. The series active filter mitigates the voltage sag/swell and load voltage harmonics, which consumes the power from Photovoltaic (PV) array with quasi Zsource inverter (qZSI). A new controller of qZSI based HSAPF uses two control schemes to boost the PV/Battery output voltage and achieve maximum power point tracking PV array. The simulation and experimental results are presented to validate the performance of proposed qZSI based HSAPF.

Harmonic current and voltage compensation using HSAPF based on hybrid control approach for synchronous reference frame method

Abstract This paper presents a Hybrid Series Active Power Filter (HSAPF) for compensation of source current and load voltage harmonics. The HSAPF combination consists of a small rated series active power filter and a shunt connected passive power filter. This combination is suitable for compensation of voltage-type as well as current-type harmonic producing load. The HSAPF uses the synchronous rotating reference frame method that based on hybrid control approach, which eliminate both source current as well as load voltage harmonics and also tests the performance of HSAPF for ideal voltage, non-ideal voltage and also at different loading conditions, etc.

Research on the Inter-harmonics Equivalent Impedance of Series Hybrid Active Power Filter

In the series hybrid active power filter (SHAPF) with magnetic flux compensation (MFC), the system current oscillate in the experimental results when adding the same phase harmonic current command in current control block. This condition endangers the security of the SHAPF. Taking the digit period average arithmetic as example, this paper explains the inter-harmonics current oscillation in the experiment. The conclusion is that the SHAPF is unstable to the inter-harmonics current in theory. Limited by the capacity of the inverter, the system current and the inverter output current do not increase to infinite. At last, some methods are proposed to solve this problem. From the practical viewpoint, the voltage feed-forward control is easy to achieve. It can suppress the current oscillation problems, and also improve the filtering effect. The feasibility of the methods is validated by both the emulation and experiment results.

An experimental assessments on different control techniques of series hybrid active power filter

Summary For high power application of active power filters, series hybrid active power filter (SHAPF) configuration is popular because of its multi-functionality and small capacity inverter requirement. The SHAPF filtering characteristics and efficiency of harmonic compensation depend on the control algorithm applied to calculate the reference voltage. This paper compares the filtering performance of SHAPF using three different control algorithms applied for reference voltage generation. The first control algorithm derives reference voltage proportional to the source current harmonics, where the source current harmonics are separated using the p-q theory. The second control algorithm derives reference voltage from load voltage harmonics separated using the dual p-q theory. The third control algorithm derives reference voltage using vector algebra-based voltage decomposition method in three-phase coordinate system. The mathematical formulation of selected three control algorithms along with their applications to SHAPF is presented. To check the filtering performance of SHAPF with selected control algorithms, an experimental prototype of SHAPF controlled by the ARM Cortex M4 microcontroller STM32F407VGT6 is developed. Experiments are performed to check the performance of SHAPF in compensating current harmonic generating load and voltage harmonic generating load. The results of compensation, the complexity involved in extracting reference, and control algorithm computation time are compared. The comparison shows that the operation of the voltage decomposition method is comparatively better due to fast extraction of the reference voltage. Copyright © 2014 John Wiley & Sons, Ltd.

THREE-PHASE FOUR-WIRE PV-BASED SERIES HYBRID ACTIVE POWER FILTER FOR POWER QUALITY IMPROVEMENT

This paper proposes a photovoltaic (PV)-based three-phase four-wire (3P4W) series hybrid active power filter (SHAPF) it comprises of a series active power filter (SAPF) and an LC shunt passive filter. The proposed system eliminates both the current and voltage harmonics and compensates reactive power, neutral current and voltage interruption. A SAPF demands a source of energy for compensating the voltage sag/swell. This system introduces a new topology for SHAPF utilizes the PV with DC–DC boost converter as a source of DC power for SAPF. The compensation current reference evaluation is based on the twin formulation of the vectorial theory of electrical power theorem with fuzzy logic controller (FLC). The PV array/battery managed DC–DC boost converter is employed to step up the voltage to meet the DC bus voltage requirement of the three-leg voltage source inverter (VSI). The foremost benefit of the proposed system is that, it will provide uninterrupted compensation for the whole day. This system utilizes the renewable energy accordingly saves the energy and shares the load during the solar irradiation available. The simulation and experimental studies are carried out to validate the effectiveness of the proposed PV-SHAPF.

Performance Evaluation of Adaptive Tabu Search Algorithm Optimized Sinusoidal Fryze Voltage Control based Hybrid Series Active Power Filter

A novel hybrid series active power filter to eliminate harmonics and compensate reactive power is presented and analyzed. The proposed active compensation technique is based in a hybrid series active filter using adaptive tabu search algorithm in the conventional Sinusoidal Fryze voltage control technique. The paper analyzes the proposed hybrid series active power filter when connected with load of 3-phase diode bridge rectifier with R-L branch directly. This paper intends to show the improvement between the performance of conventional scheme and ATS-optimized scheme. Simulation results obtained using MATLAB/Simulink confirm the viability of the proposed compensation technique.

Experimental Verification of Photovoltaic-based Three-phase Four-wire Series Hybrid Active Power Filter

—This article proposes a photovoltaic and battery interfaced series hybrid active power filter, which is comprised of a series active power filter and an inductor-capacitor (LC) shunt passive filter. The main benefits of the proposed system provide the compensation against the voltage harmonics, current harmonics, and voltage interruption for the whole day. A series active power filter demands a source of energy for compensating the voltage sag/swell. The proposed topology utilizes the green energy source with an energy storage unit to meet the DC-link voltage requirement of the series active power filter. The control strategy is based on the dual formulation of the compensation system principles with adaptive fuzzy logic controller. The simulation and experimental studies are carried out to validate the effectiveness of the proposed photovoltaic interfaced three-phase four-wire series hybrid active power filter.

A novel control method for series hybrid active power filter working under unbalanced supply conditions

In this paper a new control algorithm for a Series Hybrid Active Power Filter (SHAPF) is proposed. With the proposed control algorithm, the series active power filter simultaneously compensates for source voltage unbalance and source current harmonics generated by non-linear loads. The proposed control algorithm is based on the generalised instantaneous power theory where the instantaneous inactive power is represented as a second order tensor. The reference voltage is directly associated with three-phase instantaneous voltages and currents and are separated in three-phase co-ordinate systems. Therefore, the calculation of the compensation reference voltage is much simpler than the other available control algorithms. It can be applied for both voltage and current harmonic generating loads connected across balanced and unbalanced source voltages. The mathematical formulation of the proposed control algorithm with its applications to SHAPF is presented. The validity of the proposed control algorithm is verified with extensive experimental study and results are reported.