http://ieeexplore.ieee.org/iel5/5610941/5624686/05624745.pdf

Power electronics

This paper presents a grid-connected photovoltaic system (PV) used as a shunt active power filter (SAPF) to provide the power factor correction, harmonic elimination, reactive power compensation and to simultaneously supply power from a PV system to the utility. A direct power control (DPC) method is used for controlling the system to feed the photovoltaic energy in synchronization with grid and provide power quality improvement. The PI parameters of DC-link voltage controller are tuned using the Particle Swarm Optimization (PSO) algorithm without the need for an exact mathematical model of system. This PI-PSO controller gives better results for robustness, harmonic minimization and reduces the overshoot and undershoots of PI controller. The overall control of system is tested in Matlab/Simulink environment. Then, the simulations results demonstrate the robustness and feasibility of proposed method.

/pdf/pso-based-direct-power-control-for-a-multifunctional-grid-4f6ulgqpac.pdf

PSO based Direct Power Control for a Multifunctional Grid Connected Photovoltaic System

https://hal.archives-ouvertes.fr/hal-03185286/document

Energy quality improvement of three-phase shunt active power filter under different voltage conditions based on predictive direct power control with disturbance rejection principle

This paper presents the use of a three-phase four-wire shunt active power filter to improve the power quality in the Department of Industrial Electronics of a large enterprise from Romania The specificity is given by the predominant existence of single-phase consumers (such as personal computers, printers, lighting and AC equipment) In order to identify the power quality indicators and ways to improve them, an A-class analyzer was used to record the electrical quantities and energy parameters in the point of common coupling (PCC) with the nonlinear loads for 27 h The analysis shows that, in order to improve the power quality in PCC, three goals must be achieved: the compensation of the distortion power, the compensation of the reactive power and the compensation of the load unbalance By using the conceived three-leg shunt active power filter, controlled through the indirect current control method in an original variant, the power quality at the supply side is very much improved In the proposed control algorithm, the prescribed active current is obtained as a sum of the loss current provided by the DC voltage and the equivalent active current of the unbalanced load The performance associated with each objective of the compensation is presented and analyzed The results show that all the power quality indicators meet the specific standards and regulations and prove the validity of the proposed solution

Improving Power Quality by a Four-Wire Shunt Active Power Filter: A Case Study

In this paper, a permanent magnet synchronous generator (PMSG) coupled to a wind turbine exhibits the wind energy conversion system (WECS), links the utility grid through a $3- \varphi$ rectifier and a $3- \varphi$ voltage source inverter (VSI) to the point of common coupling (PCC). To control line current harmonics and to feed the electric power generated from wind energy into the electric grid, a feed forward neural network based Artificial Neural Network (ANN) is used in direct power control (DPC). A comparison is made on the parameter, total harmonic distortion (THD) of source current from WECS without active shunt power filter (ASPF), ASPF with proportional-integral (PI) control and ASPF with ANN controller in DPC. The active power from WECS is injected into the grid by compensating the reactive power requirements of the system. The simulation results reveal the efficacy of WECS system with ANN controller in DPC with less THD

Active Shunt Power Filter Using ANN Controller for Wind Turbine - PMSG Interfaced to Grid

This paper proposes a virtual flux direct power control-space vector modulation combined with backstepping control for three-phase five-level neutral point clamped shunt active power filter. The main goal of the proposed active filtering system is to eliminate the unwanted harmonics and compensate fundamental reactive power drawn from the nonlinear loads. In this study, the voltage-balancing control of four split dc capacitors of the five-level active ﬁlter is achieved using five-level space vector modulation with balancing strategy based on the effective use of the redundant switching states of the inverter voltage vectors. The obtained results showed that, the proposed multilevel shunt active power filter with backstepping control can produce a sinusoidal supply current with low harmonic distortion and in phase with the line voltage. DOI: http://dx.doi.org/10.11591/ijpeds.v4i2.5621

https://ijpeds.iaescore.com/index.php/IJPEDS/article/download/4990/4809

Application of Backstepping to the Virtual Flux Direct Power Control of Five-Level Three-Phase Shunt Active Power Filter

This paper proposes a sliding mode control strategy for a three-phase shunt active power filter. The SAPF consists of four-leg voltage source inverter bridge. The SAPF ensures full compensation for harmonic phase currents, harmonic neutral current, reactive power compensation and unbalanced nonlinear load currents. The modulation task can be carried out with three dimensional space vector modulation, which operate under a constant switching frequency. The simulation results show that the performance of the four-leg SAPF with the proposed control algorithm – compared with PI controller - is found considerably effective and adequate to compensate harmonics, reactive power, neutral current and balance load currents.

https://ijpeds.iaescore.com/index.php/IJPEDS/article/download/4939/5087

Sliding mode Control using 3D-SVM for Three-phase Four-Leg Shunt Active Filter

In this paper, a control algorithm based on symmetrical components is proposed to control a three-level four-leg (3L4L)DSTATCOM. The proposed control is designed in a synchronous rotating reference frame in the aim to provide high dynamic performance with complete decouple control of active power needed by the inverter and reactive power compensation required by the load. Moreover, it provides a neutral current compensation in four-wire distribution system in cases of unbalanced loads. In addition, this paper proposes a simplified algorithm of three-level three-dimensional space vector modulation (3DSVM). The proposed algorithm can reduce remarkably the complexity of 3DSVM by using two sectors only instead all the six sectors of the three-level four-leg inverter. The voltage-balancing control of DC-link capacitors is achieved based on the effective use of the redundant switching states. Simulation results are presented to verify the validity of the proposed control strategy and 3DSVM algorithm.

Reactive power compensation in three-phase four-wire distribution system using four-leg DSATATCOM based on symmetrical components

In this study, a sliding mode strategy proposed to control a three levels Back-to-Back High Voltage Direct Current (HVDC) system based on the three-level voltage source converter (VSC). The voltage-balancing control of two split DC capacitors of the VSC-HVDC system is achieved using three-level space vector modulation with balancing strategy based on the effective use of the redundant switching states of the inverter voltage vectors. Finally, a complete simulation of the VSC-HVDC system validates the efficiency of the proposed strategy law. Compared to the conventional control, Sliding Mode Control scheme for the VSC-HVDC system shows the attractive advantages such as offering high tracking accuracy, fast dynamic response and good robustness. DOI: http://dx.doi.org/10.11591/ijpeds.v4i2.5575

https://ijpeds.iaescore.com/index.php/IJPEDS/article/download/4998/4817

Sliding Mode Control of Three Levels Back-To-Back VSC-HVDC System Using Space Vector Modulation

One of the most challenges of using diode clamped multilevel inverters is the DC-link capacitor voltages unbalance problem. This paper present a new approach for balancing the intermediate DC-link capacitor voltage of three-level four-leg DSTATCOM-SMES system. The DSTATCOM-SMES is connected to a four-wire distribution system feeding a non-unity power factor unbalanced load. The control system is designed in synchronous reference frame based on symmetrical components theory to guarantee a full compensation of positive-negative- and zero-sequence of currents components in case of unbalancing conditions. The proposed balancing strategy is carried out using an appropriate balancing control loop combined with the main control system of bidirectional chopper and without a need to an additional circuit. The DSTATCOM-SMES can operate either for unity power-factor correction mode or for voltage regulation mode. The validity and effectiveness of the proposed control system for both operation modes is highlighted by computer simulations under balanced and unbalanced conditions.

DC-link capacitor voltage balancing strategy for three-level four-leg DSTATCOM-SMES system

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