scispace - formally typeset
Search or ask a question
Journal ArticleDOI

A Lyapunov-Function Based Controller for 3-Phase Shunt Active Power Filter and Performance Assessment Considering Different System Scenarios

TL;DR: In this article, a 3-phase shunt active power filter (SAPF) is designed for compensation of harmonics resulted in the feeder current owing to the customer side nonlinearity.
Abstract: Shunt active power filter (SAPF) belongs to the class of custom power devices (CPDs) and offers compensation to harmonics originated owing to customer side nonlinear loads, reactive power and unbalance in the distribution power networks functioning in current control mode (CCM). The performance of a SAPF as a harmonic compensator entirely relies on the control technique i.e. the precise detection of the harmonic current components of load that are necessary to be compensated. In the present work, a 3-phase SAPF, inspired by a Lyapunov function based control approach, has been designed for compensation of harmonics resulted in the feeder current owing to the customer side nonlinearity. A control law is determined in the proposed strategy which makes the derivative of the Lyapunov function consistently a negative one for an entire set of stable states. The DC-link capacitor voltage is regulated at constant reference through the proportional-integral (PI) controller. In this method rating of the shunt active power filter is considerably reduced than the other two broadly employed conventional methods. Furthermore, the harmonic compensation efficacy of the proposed Lyapunov function based SAPF is compared with the one based on other two conventional approaches under four different system scenarios namely a simple nonlinear load with and without utility side voltage distortion, a modified IEEE 13 bus test distribution system loaded with a 3-phase chopper fed direct current (DC) motor drive at a single bus and last especially for increasing the harmonic-constrained penetration level of renewable energy. Results obtained through simulation performed in MATLAB/Simulink shows that total harmonic distortion (THD) of source current and dynamic, as well as steady-state performance with Lyapunov function based controller, is significantly improved than the other two conventional methods. Also, the robust compensation performance of the SAPF empowers it to deal with the high penetration of renewable energy.

Content maybe subject to copyright    Report

Citations
More filters
Journal ArticleDOI
TL;DR: In this paper , the authors analyzed the technoeconomic modelling and sensitivity analysis of the available resources for the rural community in India, including solar, wind, hydro, battery and utility grid-connected system.

19 citations

Proceedings ArticleDOI
20 Mar 2022
TL;DR: In this paper , a cascaded enhanced second-order general integrator with a prefilter (CESOGI-WPF) control technique for DSTATCOM is presented.
Abstract: In the distribution network, a distribution static compensator (DSTATCOM) is used to address issues such as reactive power control, harmonic suppression, and the balancing of grid-side current. This paper presents a cascaded enhanced second-order general integrator with a prefilter (CESOGI-WPF) control technique for DSTATCOM. In addition to the prevention of non-sinusoidal load currents, the proposed control approach allows for the extraction of the positive sequence and fundamental components from distorted grid voltages. Various loading scenarios, steady-state conditions, and dynamic conditions are examined to assess the performance of the proposed controller. Based on the results of this work, the existing controllers were compared with respect to their Total Harmonic Distortion (THD), steadystate error, and computational complexity. A prototype of the proposed control scheme has been validated experimentally in a laboratory setting. It has been observed that the % THD of the grid current is maintained according to IEEE-519 harmonic standard and that the grid-tied DSTATCOM is reliable under all load conditions.

10 citations

Journal ArticleDOI
TL;DR: In this paper, a multi-objective Pareto-based bat algorithm (pb-MOBA) was proposed to improve the harmonic-constrained hosting capacity (HC-HC) of inverter-based distributed generation (DG) systems under non-sinusoidal grid conditions.
Abstract: Passive harmonic filtering is used in this work to improve the harmonic-constrained hosting capacity (HC-HC) of inverter-based distributed generation (DG) systems under non-sinusoidal grid conditions. The optimum parameters of a C-type passive filter (CTPF) along with the rating of the DG system are concurrently fixed. The best possible HC of the distorted grid for DG is realized while keeping overall filter cost (FC) suffered at the lowest. A best-of-breed solution is attained making use of the newly proposed multi-objective Pareto-based bat algorithm (pb-MOBA). The formulated problem of multi-objective optimization (MOO) is dealt with under a number of system performance indices (PIs) constraints such as individual as well as total harmonic distortion (THD) in the line current and the point of common coupling's (PCC) voltage, distribution line ampacity under harmonic current overloading, steady-state voltage profile, load power factor (PF), and so on and a handful that is linked to the passive power filter (PPF) itself. The Pareto optimal front is produced using the MOBA extension, and the trade-off between the objectives is examined. The efficiency and accuracy of pb-MOBA, in dealing with the designated MOO problem, is confirmed by making a comparison of the acquired solution and three computed PIs viz. diversity metric (DM), generational distance (GD), and convergence metric (CM) with those achieved by Multi-objective Pareto-based PSO (pb-MOPSO), Non-dominated Sorting Genetic Algorithm (NSGA), Multi-objective Evolutionary Algorithm based on Decomposition (MOEA/D), and the Strength Pareto Evolutionary Algorithm (SPEA). The Monte Carlo approach provides a true Pareto front (TPF) that meets the requirement. Also as additional analysis, the effects of utility side background voltage distortion (BVD) plus load-side’s nonlinearity level (NLL) on the performance of filter are explored. The results of the simulation achieved with different BVD and NLL levels demonstrate that the presence of distortion in the background is helpful from the filter's cost perspective. From the enhanced HC perspective though both are seen leaving negative impact nonetheless BVD is proven to be more harmful than NLL on the load side.

6 citations

Journal ArticleDOI
15 Mar 2023-Energies
TL;DR: In this article , a grid-connected photovoltaic (PV)-powered EV charging station with converter control technique is proposed, where the controller unit is interfaced with the renewable energy source, bidirectional converter, and local energy storage unit (ESU).
Abstract: Electric vehicles (EVs) are considered as the leading-edge form of mobility. However, the integration of electric vehicles with charging stations is a contentious issue. Managing the available grid power and bus voltage regulation is addressed through renewable energy. This work proposes a grid-connected photovoltaic (PV)-powered EV charging station with converter control technique. The controller unit is interfaced with the renewable energy source, bidirectional converter, and local energy storage unit (ESU). The bidirectional converter provides a regulated output with a fuzzy logic controller (FLC) during charging and discharging. The fuzzy control is implemented to maintain a decentralized power distribution between the microgrid DC-link and ESU. The PV coupled to the DC microgrid of the charging station is variable in nature. Hence, the microgrid-based charging is examined under a range of realistic scenarios, including low, total PV power output and different state of charge (SOC) levels of ESU. In order to accomplish the effective charging of EV, a decentralized energy management system is created to control the energy flow among the PV system, the battery, and the grid. The proposed controller’s effectiveness is validated using a simulation have been analyzed using MATLAB under various microgrid situations. Additionally, the experimental results are validated under various modes of operation.

5 citations

Journal ArticleDOI
TL;DR: In this article , a new deadbeat-based DPC method is proposed firstly to generate reference current and control of active power filter, and a simple and robust compensation method was proposed to eliminate aforementioned deadbeat delay thanks to the online/offline predictions.
Abstract: Active Power Filter (APF) can significantly compensate the current harmonics produced by nonlinear loads. To do this feature, harmonic detection reference current generation play vital role. Direct Power Controller (DPC) has great harmony with instantaneous power compensation (PQ) algorithm as well as the ability to eliminate internal current loops. In addition, DeadBeat Controller (DBC) has high compatibility for digital implementation, superior control performance and fast dynamic response. However, DBC suffers from time delay linked to control action calculation and digital implementation. In this paper, a new deadbeat-based DPC method is proposed firstly to generate reference current and control of APF. Secondly, a simple and robust compensation method is proposed to eliminate aforementioned deadbeat delay thanks to the online/offline predictions. Several simulations are conducted in MATLAB/SIMULINK verified by experimental tests obtained from a DSP-based active power filter to illustrate the effectiveness and superior performance of the proposed control method. By employing the proposed control method, the Total Harmonic Distortion (THD) of grid current is decreased from 22% to 3% under steady state condition. While the dynamic response with proposed delay compensation validates significant transient response improvement.

4 citations

References
More filters
Journal ArticleDOI
TL;DR: In this paper, the authors presented the general equations that relate the new concepts of instantaneous active and reactive power theory and the well known theory of symmetrical components for the case of 3-phase 4-wire systems, where zero sequence components and harmonics may be present in both voltages and currents.
Abstract: This paper presents the general equations that relate the new concepts of instantaneous active and reactive power theory and the well known theory of Symmetrical Components, for the case of 3-phase 4-wire systems, where zero sequence components and harmonics may be present in both voltages and currents. Based on these equations, new control algorithms for 3-phase 4-wire shunt and series active filters for unbalanced power systems are proposed and validated through simulations. The control algorithms presented here are very important for active power filter design and also for FACTS technology reactive power compensators. >

328 citations

Journal ArticleDOI
TL;DR: It was concluded that success in integrating more distributed generation hinges on accurate hosting capacity assessment, and a systematic and extensive overview of the HC research, developments, assessment techniques and enhancement technologies is provided.

314 citations

Journal ArticleDOI
TL;DR: In this paper, a nonlinear adaptive notch filter based on the concept of an enhanced phase-locked loop (PLL) is proposed for online signal analysis for power systems protection, control and power quality enhancement.
Abstract: This paper presents various applications of a nonlinear adaptive notch filter which operates based on the concept of an enhanced phase-locked loop (PLL). Applications of the filter for online signal analysis for power systems protection, control and power quality enhancement are presented. The proposed scheme can be applied for signal analysis both under stationary and nonstationary conditions. Based on digital time-domain simulations, applications of the filter for (a) sinusoidal waveform peak detection, (b) harmonic identification/detection, (c) detection/extraction of individual components of a signal, (d) instantaneous reactive current extraction, (e) disturbance detection, (f) noise reduction in zero-crossings detection, and (g) amplitude (phase) demodulation for flicker estimation, are presented.

307 citations

Journal ArticleDOI
TL;DR: An energy-based Lyapunov function control technique is developed for a three-phase shunt hybrid active filter (SH-AF) to compensate harmonics generated by nonlinear loads and is applied for balanced operation.
Abstract: In this paper, an energy-based Lyapunov function control technique is developed for a three-phase shunt hybrid active filter (SH-AF) to compensate harmonics generated by nonlinear loads and is applied for balanced operation. The method provides compensation for harmonic load current components. The strategy determines the control law that makes the derivative of the Lyapunov function always negative for all values of the states. The dc bus voltage of the SH-AF is maintained to 50 V, which is significantly lower than that of the conventional hybrid active filter. The rating of the active filter in the SH-AF system is much smaller than the one used in the conventional shunt active power filter because the passive filter takes care of the major burden of compensation. The SH-AF performances, during both nominal and severe operating conditions, are then evaluated using a dSPACE DS1104 controller board, supported by a Matlab/Simulink Real-Time Workshop environment. A significantly high correlation between the experimental results and the theoretical model, implemented with Simulink/Matlab, is obtained.

223 citations

Journal ArticleDOI
TL;DR: The proposed scheme utilizes neural network-based decomposition of the load current into positive and negative sequence fundamental frequency component, reactive component and harmonic components and facilitates selective compensation which respects the limited rating of APF.
Abstract: Active power filters (APFs) have been used to compensate harmonics, reactive current, and negative sequence fundamental frequency current drawn by nonlinear loads. The control of APF is the core issue for their proper operation. The flexibility of selective compensation embedded in the control scheme makes APF versatile for compensation of reactive power, harmonic currents, and unbalance in source currents and their combinations, depending upon the limited rating of voltage source inverter employed as APF. The proposed scheme utilizes neural network-based decomposition of the load current into positive and negative sequence fundamental frequency component, reactive component and harmonic components. The adaline-based current decomposer estimates the reference currents through tracking of unit vectors together with tuning of the weights. The implementation of the control scheme facilitates selective compensation which respects the limited rating of the APF. The simulated results using developed MATLAB model are presented and are validated by experimental results to depict the effectiveness of the proposed control method of APF

178 citations