Power Quality Improvement of High Voltage DC Link using Modified Shunt Active Power Filter

2018 ◽  
Vol 1 (1) ◽  
pp. 54-66
Author(s):  
Rakan Khalil Antar ◽  
Basil Mohammed Saied ◽  
Rafid Ahmed Khalil
Keyword(s):  
Power Quality ◽  
High Voltage ◽  
Pulse Width Modulation ◽  
Active Power Filter ◽  
Active Power ◽  
Voltage Source ◽  
Active Power Filters ◽  
Power Filter ◽  
Power Filters ◽  
Power Quality Improvement

A new control strategy for active power filters is proposed, modeled and implemented in order to improve the power quality of a line commutated converter High voltage DC link. The ability of reactive power and harmonics reductions are generally met by using passive and active power filters. In this paper, modified active power filter with a modified harmonics pulse width modulation algorithm is used to minimize the source harmonics and force the AC supply current to be in the same phase with AC voltage source at both sending and receiving sides of a line commutated converter high voltage DC link. Therefore, it is considered as power factor corrector and harmonics eliminator with random variations in the load current. The modified harmonics pulse width modulation algorithm is applicable for active power filter based on a three-phase five-level and seven-level cascaded H-bridge voltage source inverter. Simulation results show that the suggested modified multilevel active power filters improve total harmonics distortion of both voltage and current with almost unity effective power factor at both AC sides of high voltage DC link. Therefore, modified active power filter is an effective tool for power quality improvement and preferable for line commutated converter high voltage DC link at different load conditions.

scholarly journals A PLL Scheme for Synchronization with Grid Voltage Phasor in Active Power Filter Systems

2010 ◽  
Vol 27 (1) ◽  
pp. 134-137 ◽  
Author(s):  
Oskars Krievs ◽  
Ingars Steiks ◽  
Leonids Ribickis
Keyword(s):  
Active Power Filter ◽  
Active Power ◽  
Active Filter ◽  
Positive Sequence ◽  
Voltage Source ◽  
Grid Voltage ◽  
Active Power Filters ◽  
Voltage Source Inverters ◽  
Power Filter ◽  
Power Filters

A PLL Scheme for Synchronization with Grid Voltage Phasor in Active Power Filter SystemsVoltage source inverters connected to the grid in applications such as active power filters require synchronization with the grid voltage. Since in practice the grid voltage can be unbalanced and distorted, but the operation of the whole active filter control system is strongly dependant on precise estimation of grid voltage phase, the fundamental positive sequence phasor of the grid voltage has to be extracted. In this paper a system for smooth estimation of the position of the voltage phasor at the point of common coupling of a parallel active filter system is presented using a sinusoidal signal integrator and a simple software PLL. The performance of the proposed system is verified by simulation and experimental results. The proposed PLL scheme can also be used in other vector oriented control systems.

scholarly journals Series active power filter supplied by fuel cell for mitigating power quality issues

2020 ◽  
Vol 9 (2) ◽  
pp. 173
Author(s):  
Abdallah Ben Abdelkader ◽  
Othmane Abdelkhalek ◽  
Youssef Mouloudi ◽  
Mohamed Amine Hartani ◽  
Benabid Slimane
Keyword(s):  
Fuel Cell ◽  
Power Quality ◽  
Pulse Width Modulation ◽  
Active Power Filter ◽  
Active Power ◽  
Maximum Power ◽  
Voltage Source ◽  
Control Loops ◽  
Power Filter ◽  
Quality Issues

<div data-canvas-width="174.49288953839948">In this paper, the combination of the series active power filter (SAPF) with a fuel cell (FC) source is deliberated. The FC based on the SAPF aims to compensate voltage deviations or disturbances that occur in the system caused by power quality issues. The proposed system consists of a fuel cell source connected to the DC l ink through two DC-DC converters, the first extracts the maximum power of the FC source through pulse width modulation (PWM) signals generated from the maximum power point tracker (MPPT) controller. Thus, the second converter is used to regulate the high voltage side of the converter through closed control loops, in addition to a voltage source inverter (VSI) and a series injection transformer. Despite of fluctuations of the DC link during the compensation of the needed energy, MPPT and closed control loops generate PWM signals to the switching devices of DC-DC boost converters in order to extract maximum fuel cell power and to maintain the bus voltage within its limits and around its reference values respectively. The proposed topology is simulated in MATLAB/Simulink software, where simulation results show that the proposed FC based SAPF can efficiently reduce problems of voltage sags-wells and harmonics.</div>

The Research Status and Development Trend of Active Power Filter

2014 ◽  
Vol 494-495 ◽  
pp. 1487-1490
Author(s):  
You Jie Ma ◽  
Hong De Yuan ◽  
Xue Song Zhou
Keyword(s):  
Power Quality ◽  
Active Power Filter ◽  
Development Trend ◽  
Current Situation ◽  
Active Power ◽  
Nonlinear Loads ◽  
Active Power Filters ◽  
Power Filter ◽  
Power Filters ◽  
Key Technologies

Power quality is getting worse with the extensive application of nonlinear loads, and active power filter technology is the effective way to settle the problem. This paper introduces the basic theory and the sorts of active power filters at first. Then the key technologies of active power filter are discussed in detail. Finally, based on some problems about current situation of active power filters, the directions of its development are analyzed in this paper.

scholarly journals Enhancement of Power Quality Using Voltage and Hall Effect Current Sensors Applied on Controlled Single-Phase Active Power Filter

2020 ◽  
Vol 2 (1) ◽  
pp. 74
Author(s):  
Felipe Barnabé ◽  
Marco Rocha ◽  
Guilherme Clerice
Keyword(s):  
Hall Effect ◽  
Power Quality ◽  
Single Phase ◽  
Active Power Filter ◽  
Active Power ◽  
Economic Losses ◽  
Active Power Filters ◽  
Power Filter ◽  
Power Filters ◽  
Harmonic Content

Switched-mode power supply and semiconductor devices have been gaining more and more applicability in the industrial scenario. With the massive use of these devices, several problems related to power quality and equipment degradation have been arising, caused mainly by the harmonic content present in current and voltage. Power quality problems have direct implications for business productivity, causing high economic losses. Therefore, it is mandatory to develop solutions that mitigate these problems. Active power filters (APF) are power electronic equipment capable of compensating power quality problems. Moreover, it presents the ability to dynamically adjust their modes of operation in response to changes in load or the power systems. Active power filters present the economical advantage of using the same current and voltage sensors already existing in a power system. Aiming to develop an APF for single-phase applications, this work proposes a shunt controlled active power filter using hall effect current and voltage sensor, aiming to compensate harmonic currents provided by nonlinear loads. It was proposed two proportional-integral compensators, where the external loop is responsible for link-CC control and the inner loop is responsible for current compensation. The results show the applicability of the proposed APF, since all harmonic content was filtered.

Review of Control Methods for Active Power Filters

2013 ◽  
Vol 811 ◽  
pp. 657-660 ◽  
Author(s):  
You Jie Ma ◽  
Hong De Yuan ◽  
Xue Song Zhou
Keyword(s):  
Power System ◽  
Control Strategies ◽  
Active Power Filter ◽  
Active Power ◽  
Power Electronic ◽  
Active Power Filters ◽  
Power Filter ◽  
Power Filters ◽  
Reactive Current ◽  
Contrast Analysis

With the wide application of power electronic equipments in power system, more and more harmonic are poured into the power system, which cause power pollution and make the power quality problem increasingly serious. Active power filter (APF) is an important equipment to compensate harmonic and reactive current in power system. One of the key technologies lies in the real-time and accurate control. The fundamental principles of several control strategies of compensate current were presented, and the respective merit and demerit of these control strategies were pointed out with contrast analysis in this paper. Active power filter will achieve a higher performance and a wider application with the continuous development of the control strategy.

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