scholarly journals Harmonics Compensation by Using a Multi-Modular H-Bridge-Based Multilevel Converter

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4698
Author(s):  
Raul Gregor ◽  
Julio Pacher ◽  
Alejandro Espinoza ◽  
Alfredo Renault ◽  
Leonardo Comparatore ◽  
...  
Keyword(s):  
Control System ◽  
Predictive Control ◽  
Multilevel Converter ◽  
Nonlinear Loads ◽  
Current Harmonics ◽  
Voltage Sensors ◽  
Power Filter ◽  
Point Of Common Coupling ◽  
Common Coupling ◽  
Grid Side

This paper presents an active power filter based on a seven-level cascade H-bridge where the main contribution is a control strategy that combines model-based predictive control, the voltage vectors of the converter output levels, the phase shift PWM technique, and suboptimal DC-link voltage control. The proposed scheme greatly simplified the overall control system, making it well suited to compensate the current harmonics distortion at the grid side, generated by nonlinear loads connected to the point of common coupling. In addition, the proposed method achieved a balancing of the capacitor voltages of the seven-level cascade H-bridge converter by using the minimum DC-link voltage sensors. This feature significantly reduced the control system complexity and provided a low computational burden. Experimental results confirmed the feasibility and effectiveness of the proposed controller.

CURRENT HARMONICS MITIGATION FROM GRID CONNECTED VARIABLE SPEED WIND TURBINE DUE TO NONLINEAR LOADS USING SHUNT ACTIVE POWER FILTER

2017 ◽  
Vol 79 (4) ◽  
Author(s):  
Sajid Hussain Qazi ◽  
Mohd Wazir Mustafa ◽  
U. Sultana ◽  
Nayyar Hussain Mirjat
Keyword(s):  
Wind Turbine ◽  
Active Power Filter ◽  
Active Power ◽  
Variable Speed ◽  
Nonlinear Loads ◽  
Shunt Active Power Filter ◽  
Current Harmonics ◽  
Power Filter ◽  
Current Controller ◽  
Synchronous Reference Frame

The quality of power nowadays is of great concern due to increasing demand of supply and energy resources are limited, another cause is increasing penetration of nonlinear loads in the power system. In order to overcome energy supply challenges, the focus of technologists is shifting to the renewable energy side such as the wind and solar energy and so on. As such, mitigating effect of nonlinear loads have become ever important as well. In this context, various techniques have been used by researchers in past decades. Shunt active power filter (APF) have long been used to mitigate current harmonics from fixed wind turbine generator (WTG). In this study shunt APF has been applied with variable speed WTG using synchronous reference frame (SRF) for the extraction of compensation signal for APF. Gate driver signals are generated from Bang-Bang Controller (Hysteresis Band Current Controller HBCC). A MATLAB/SIMULINK based Model have been developed. The Simulation results show decreased THD levels of the system and clearly suggest the effectiveness of Shunt APF in meeting the IEEE-519 standard recommendation for harmonic levels in WTG.

scholarly journals PI Regulator with Tracking Anti-Windup Based Modified Power Balance Theory for SAPF under Unbalanced Grid Voltage Unbalance Non Linear Loads

2019 ◽  
Vol 23 (2) ◽  
Author(s):  
Zellouma Laid ◽  
Khechiba Kamel ◽  
Benaissa Amar
Keyword(s):  
Reactive Power ◽  
Power Balance ◽  
Balance Theory ◽  
Nonlinear Loads ◽  
Shunt Active Power Filter ◽  
Current Harmonics ◽  
Voltage Unbalance ◽  
Pi Regulator ◽  
Power Filter ◽  
Unbalanced Grid

This paper presents a modified power balance theory for extracting the reference compensating currents to shunt active power filter (SAPF) which is applied to illuminate current harmonics and compensate reactive power under unbalanced voltages and unbalancing Nonlinear loads. A new method has been proposed based proportional-integrator (PI) controller with tracking anti-windup protection is presented. The power balance theory is used to establish suitable current reference signals. The studied is carried out with Matlab/Simulink and power system tools to verify the performance of the proposed technique. The filtering method of the SAPF can achieve the THD% limit specified by the IEEE-519 standard.

scholarly journals Analytical Modeling and Simulation of Four-Switch Hybrid Power Filter Working with Sixfold Switching Symmetry

2012 ◽  
Vol 2012 ◽  
pp. 1-17 ◽  
Author(s):  
Josef Tlustý ◽  
Jiří Škramlík ◽  
Jan Švec ◽  
Viktor Valouch
Keyword(s):  
Power System ◽  
Active Power ◽  
Electric Power System ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Negative Effects ◽  
Nonlinear Loads ◽  
Current Harmonics ◽  
Power Filter ◽  
Voltage Harmonics

Shunt active power filters are nowadays used for mitigation of harmonic currents from nonlinear loads. Current and voltage harmonics have negative effects on the operation of the electric power system. Thus, a great attention is focused on harmonic generation and control. Several standards have introduced limits on current harmonics injected into the power system and on voltage harmonics at the system busbars. The paper proposes a switching strategy for a four-switch converter as used in conventional six-switch converters. The voltage source converter is controlled by a unique space-vector modulation strategy proposed. Here is presented an analytical solution for a proposed active power filter topology, simulation, and experiments results proving the proposed strategy correctness and its characteristics.

Simulation of Novel Three-Level Shunt Active Power Filter

2012 ◽  
Vol 195-196 ◽  
pp. 748-753
Author(s):  
Xing Gang Li ◽  
Ren Yong Feng ◽  
Hai Zhen Kang ◽  
Zhi Guo Shi
Keyword(s):  
Dynamic Balance ◽  
Current Source ◽  
Active Power Filter ◽  
Active Power ◽  
Nonlinear Loads ◽  
Shunt Active Power Filter ◽  
Current Harmonics ◽  
Power Filter ◽  
Control Scheme ◽  
And Control

A new topology of shunt active power filter with two-leg three-level clamped capacitor in the main circuit is presented, and the operation principle and control scheme are introduced. The adopted device is operated as a controllable current source to eliminate current harmonics. The new hysteretic current comparison control scheme is used to track the command current and to balance the neutral-point voltage. Meanwhile the redundant operating states in the adopted inverter can be selected to compensate the clamped capacitor voltage to achieve the dynamic balance of the capacity voltage. Simulation results show that the shunt active power filter can effectively eliminate harmonics of the nonlinear loads.

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