High dynamic performance power quality conditioner for AC microgrids

Jarwar, Asif Raza; Soomro, Amir Mahmood; Memon, Zubair Ahmed; Odhano, Shafiq; Uqaili, Muhammad Aslam; Larik, Abdul Sattar

doi:10.1049/iet-pel.2018.5264

Cited by 13 publications

(10 citation statements)

References 21 publications

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“…where c = A 2 e jφ , z = e jωT s , and * represents the complex conjugate. According to the 2nd-order autoregressive model, the total squared error E for the signal estimation can be illustrated with the linear combination of three successive samples in Equation (3), where x is the parameter for the estimation [14].…”

Section: Adaptive Frequency Detection Technique (Afdt)mentioning

confidence: 99%

“…These power quality disturbances may lead to the power losses, malfunction of equipment, excessive heating, and communication interferences for the sensitive devices, etc. [1][2][3]. As a result, the compensation for the distorted current of nonlinear load to maintain the power quality has become one of major concerns in the modernization of power and energy systems in recent years [4].…”

Section: Introductionmentioning

confidence: 99%

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Adaptive Frequency-Based Reference Compensation Current Control Strategy of Shunt Active Power Filter for Unbalanced Nonlinear Loads

et al. 2019

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The shunt active power filter (SAPF) is an effective means for the modification of power quality. However, the compensation performance of SAPF would be deteriorated when the unbalanced nonlinear loads are present in the power system. To enhance the compensation performance of SAPF, the adaptive frequency-based reference compensation current control strategy is proposed in this paper. The proposed solution procedure can be divided into three stages including adaptive frequency detection, phase synchronization, and adaptive compensation. With the tracking of power system frequency, the phase synchronization for the SAPF compensation can be effectively modified under the power variation of unbalanced nonlinear loads. Based on the correct synchronization phase angle, the reference compensation current of SAPF can be accurately obtained with the adaptive linear neural network (ALNN) in the stage of adaptive compensation. In addition, the direct current (DC)-link voltage of SAPF can also be effectively regulated to maintain the compensation performance. To verify the effectiveness of the proposed adaptive frequency-based reference compensation current control strategy, the comprehensive case studies implemented with the hardware-in-the-loop (HIL) mechanism are performed to examine the compliance with the specification limits of IEEE Standard 519-2014. The experimental results reveal that the performance of proposed SAPF control strategy is superior to that of the traditional instantaneous reactive power compensation control technique (p-q method) and sliding discrete Fourier transform (DFT).

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Section: Adaptive Frequency Detection Technique (Afdt)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Adaptive Frequency-Based Reference Compensation Current Control Strategy of Shunt Active Power Filter for Unbalanced Nonlinear Loads

et al. 2019

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“…The presence of nonlinear loads, such as personal computers, variable frequency drives (VFDs) and arc furnaces, gives rise to power quality problems, e.g., harmonic distortion, voltage fluctuation and noise [3][4][5]. Harmonic distortion in low-voltage distribution systems is responsible for power losses, electric devices heating, insulation failures, interference issues in communication systems and in the worst cases, electric power system failure [6,7]. Therefore, the need for the elimination of power quality problems has become an important issue for both the utility and the customer [8].…”

Section: Introductionmentioning

confidence: 99%

Modeling and Simulation of a PI Controlled Shunt Active Power Filter for Power Quality Enhancement Based on P-Q Theory

2020

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The design of reliable power filters that mitigate current and voltage harmonics to meet the power quality requirements of the utility grid is a major requirement of present-day power systems. In this paper, a detailed systematic approach to design a shunt active power filter (SAPF) for power quality enhancement is discussed. A proportional–integral (PI) controller is adopted to regulate the DC-link voltage. The instantaneous reactive power theory is employed for the reference current’s extraction. Hysteresis current control is used to obtain the gate pulses that control the voltage source inverter (VSI) switches. The detailed SAPF is developed and simulated for balanced nonlinear loads and unbalanced nonlinear loads using MATLAB/Simulink. The simulation results indicate that the proposed filter can minimize the harmonic distortion to a level below that deployed by the Institute of Electrical and Electronics Engineers (IEEE) standards.

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“…Therefore, power quality problems in the weak power grid should be well handled. Among the several power quality improvement measures, the shunt active power filter (SAPF), based on the principle of the controlled current source, provides a flexible and effective solution for the weak grid [6][7][8]. It can inject a compensation current characterized by the equal amplitude and the opposite phase compared with the load-side reactive and harmonic current to ensure the grid-side unity power factor and sinusoidal current.…”

Section: Introductionmentioning

confidence: 99%

Applying Directly Modified RDFT Method in Active Power Filter for the Power Quality Improvement of the Weak Power Grid

Hou

Song

et al. 2020

Energies

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The recursive discrete Fourier transformation (RDFT) method can be used for grid voltage phase-locking and harmonic current detection in a shunt active power filter (SAPF). However, in weak power grids such as microgrids, significant errors might occur in the amplitude and phase detection due to grid frequency deviation. In this study, to resolve this problem, a directly modified RDFT (DMRDFT) method is proposed for SAPF weak grid application. Through theoretical analysis, the errors of phase and amplitude detection were found to consist of fixed error and fluctuating error. The fixed error is only determined by frequency deviation, whereas the fluctuating error is also related to the recursive pointer and the initial phase. The DMRDFT algorithm can obtain the real grid frequency through the calculation of the phase angle difference for two consecutive periods. Then it can employ the grid frequency deviation and the recursive pointer value to directly correct the detection results gathered by the conventional RDFT algorithm. As a result, DMRDFT can yield accurate amplitude and phase information of the grid voltage or current with a simple calculation. Simulation results verify the high precision of the proposed DMRDFT method in both steady and dynamic situations. Experimental results show that the DMRDFT method can significantly increase the SAPF compensation performance when grid frequency shifts.

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High dynamic performance power quality conditioner for AC microgrids

Cited by 13 publications

References 21 publications

Adaptive Frequency-Based Reference Compensation Current Control Strategy of Shunt Active Power Filter for Unbalanced Nonlinear Loads

Adaptive Frequency-Based Reference Compensation Current Control Strategy of Shunt Active Power Filter for Unbalanced Nonlinear Loads

Modeling and Simulation of a PI Controlled Shunt Active Power Filter for Power Quality Enhancement Based on P-Q Theory

Applying Directly Modified RDFT Method in Active Power Filter for the Power Quality Improvement of the Weak Power Grid

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