Control techniques for active power filters

Green, Tim; Marks, J.

doi:10.1049/ip-epa:20040759

Cited by 194 publications

(108 citation statements)

References 74 publications

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“…Generally, they are obtained by using indirect identification approach [54], where the dc components are first extracted by using a second STF followed by removal of the extracted dc components from the actual load current in α-β frame. This approach can be expressed as follows:…”

Section: Conventional Self-tuning Filter-based Instantaneous Power (Smentioning

confidence: 99%

A Refined Self-Tuning Filter-Based Instantaneous Power Theory Algorithm for Indirect Current Controlled Three-Level Inverter-Based Shunt Active Power Filters under Non-sinusoidal Source Voltage Conditions

et al. 2017

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Abstract:In this paper, a refined reference current generation algorithm based on instantaneous power (pq) theory is proposed, for operation of an indirect current controlled (ICC) three-level neutral-point diode clamped (NPC) inverter-based shunt active power filter (SAPF) under non-sinusoidal source voltage conditions. SAPF is recognized as one of the most effective solutions to current harmonics due to its flexibility in dealing with various power system conditions. As for its controller, pq theory has widely been applied to generate the desired reference current due to its simple implementation features. However, the conventional dependency on self-tuning filter (STF) in generating reference current has significantly limited mitigation performance of SAPF. Besides, the conventional STF-based pq theory algorithm is still considered to possess needless features which increase computational complexity. Furthermore, the conventional algorithm is mostly designed to suit operation of direct current controlled (DCC) SAPF which is incapable of handling switching ripples problems, thereby leading to inefficient mitigation performance. Therefore, three main improvements are performed which include replacement of STF with mathematical-based fundamental real power identifier, removal of redundant features, and generation of sinusoidal reference current. To validate effectiveness and feasibility of the proposed algorithm, simulation work in MATLAB-Simulink and laboratory test utilizing a TMS320F28335 digital signal processor (DSP) are performed. Both simulation and experimental findings demonstrate superiority of the proposed algorithm over the conventional algorithm.

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Section: Conventional Self-tuning Filter-based Instantaneous Power (Smentioning

confidence: 99%

A Refined Self-Tuning Filter-Based Instantaneous Power Theory Algorithm for Indirect Current Controlled Three-Level Inverter-Based Shunt Active Power Filters under Non-sinusoidal Source Voltage Conditions

et al. 2017

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“…For the purpose of harmonics extraction, both I Ldpacq and I Lqpacq components are required for reference current generation. Generally, the ac components are obtained through indirect identification approach [46] where a tuned numerical low pass filter (LPF) is usually employed to detect the dc component which is then being removed from the actual load current in dq frame [12,31,40]. This approach can be represented as:…”

Section: Harmonics Extraction Algorithmmentioning

confidence: 99%

DC-Link Capacitor Voltage Regulation for Three-Phase Three-Level Inverter-Based Shunt Active Power Filter with Inverted Error Deviation Control

et al. 2016

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Abstract:A new control technique known as inverted error deviation (IED) control is incorporated into the main DC-link capacitor voltage regulation algorithm of a three-level neutral-point diode clamped (NPC) inverter-based shunt active power filter (SAPF) to enhance its performance in overall DC-link voltage regulation so as to improve its harmonics mitigation performances. In the SAPF controller, DC-link capacitor voltage regulation algorithms with either the proportional-integral (PI) or fuzzy logic control (FLC) technique have played a significant role in maintaining a constant DC-link voltage across the DC-link capacitors. However, both techniques are mostly operated based on a direct voltage error manipulation approach which is insufficient to address the severe DC-link voltage deviation that occurs during dynamic-state conditions. As a result, the conventional algorithms perform poorly with large overshoot, undershoot, and slow response time. Therefore, the IED control technique is proposed to precisely address the DC-link voltage deviation. To validate effectiveness and feasibility of the proposed algorithm, simulation work in MATLAB-Simulink and experimental implementation utilizing a TMS320F28335 Digital Signal Processor (DSP) are performed. Moreover, conventional algorithms with PI and FLC techniques are tested too for comparison purposes. Both simulation and experimental results are presented, confirming the improvement achieved by the proposed algorithm in terms of accuracy and dynamic response in comparison to the conventional algorithms.

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“…Considering the properties of three-phase systems, the three-phase quantities can be transformed into two-phase quantities in synchronous rotating reference frame (SRRF, or, d − q reference frame) by applying Park's Transformations [24]. Hence two groups of ADALINEs are adopted in the d-axis and q-axis of the synchronous rotating frame to derive the dc components in d − q reference frame, corresponding to the fundamental components of load currents in stationary phase a − b − c frame.…”

Section: System Description and Problem Statementmentioning

confidence: 99%

“…. ± 6n + 1 (n is integer), corresponding to the 6n th order harmonics in synchronous rotating frame due to one fundamental frequency shift from the stationary phase coordinate to synchronous rotating reference frame, as discussed in Reference [24]. Therefore, for harmonic estimation of threephase rectifier load currents, only the weights for characteristic harmonics (6n th order) are needed to be updated in the synchronous frame ADALINE.…”

Section: A New Scheme For Power Factor Correction and Active Filterinmentioning

confidence: 99%

A new scheme for power factor correction and active filtering for six-pulse converters loads

Han¹,

Khan²,

Xu³

et al. 2009

Bulletin of the Polish Academy of Sciences: Technical Sciences

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Abstract. This paper presents a novel harmonic-free power factor correction (PFC) topology based on T-type active power filter (APF), which is dedicated for power factor improvement and harmonic filtering for six-pulse converter loads. The cascaded controller structure is adopted for the proposed system, namely, the inner current loop and outer voltage loop. The current-loop control scheme is based on a decoupled state-space equations of the T-type APF using separate proportional-integral (PI) controllers in d-axis and q-axis of the synchronous rotating reference frame (SRRF) synchronized with grid voltages, respectively. The fundamental components of load-side currents are feed forwarded in the current-loop using two groups of synchronous frame adaptive linear neural networks (ADALINEs) to ensure estimation accuracy and a fast dynamic response. A separate proportional-integral (PI) controller is adopted in the outer voltage loop for balancing the active power flow of the voltage source inverter (VSI) dc-side capacitor. The experimental results confirm well with the theoretical analysis.

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Control techniques for active power filters

Cited by 194 publications

References 74 publications

A Refined Self-Tuning Filter-Based Instantaneous Power Theory Algorithm for Indirect Current Controlled Three-Level Inverter-Based Shunt Active Power Filters under Non-sinusoidal Source Voltage Conditions

A Refined Self-Tuning Filter-Based Instantaneous Power Theory Algorithm for Indirect Current Controlled Three-Level Inverter-Based Shunt Active Power Filters under Non-sinusoidal Source Voltage Conditions

DC-Link Capacitor Voltage Regulation for Three-Phase Three-Level Inverter-Based Shunt Active Power Filter with Inverted Error Deviation Control

A new scheme for power factor correction and active filtering for six-pulse converters loads

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