A Simple Voltage Sensorless Active Damping Scheme for Three-Phase PWM Converters With an $LCL$ Filter

Malinowski, Mariusz; Bernet, Steffen

doi:10.1109/tie.2008.917066

Cited by 258 publications

(113 citation statements)

References 17 publications

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“…According to the equivalent circuit of the proposed impedance-matching based control, the reconstructed output impedance of the GCC can be obtained in (10). Comparing the original output impedance in (4) with the conventional double-loop control scheme, the zero and pole placement of the output impedance can be reconfigured by the proposed method.…”

Section: A Principle Of the Proposed Methodsmentioning

confidence: 99%

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Impedance Matching Based Control for the Resonance Damping of Microgrids with Multiple Grid Connected Converters

Tan¹,

Geng²,

Yang³

2016

Journal of Power Electronics

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This paper presents an impedance-matching-based control scheme for the harmonic resonance damping of multiple grid-connected-converters (GCCs) with LCL filters. As indicated in this paper, harmonic resonance occurs if a GCC possesses an output impedance that is not matched with the rest of the network in some specific frequency bands. It is also revealed that the resonance frequency is associated with the number of GCCs, the grid impedance and even the capacitive loads. By controlling the grid-side current instead of the converter-side current, the critical LCL filter is restricted as an internal component. Thus, the closed-loop output impedance of the GCC within the filter can be configured. The proposed scheme actively regulates the output impedance of the GCC to match the impedance of the external network, based on the detected resonance frequency. As a result, the resonance risk of multiple GCCs can be avoided, which is beneficial for the plug-and-play property of the GCCs in microgrids. Simulation and experimental results validate the effectiveness of the proposed method.

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Section: A Principle Of the Proposed Methodsmentioning

confidence: 99%

“…The basic idea is to introduce system state variables to achieve feedback control [9]. Examples of these state variables include the filter capacitor voltage [10], [11], the inverter-side inductor current [12], and the filter capacitor current [13]- [16]. Moreover, multiple-state feedback is also employed for active damping [17].…”

Section: Introductionmentioning

confidence: 99%

Impedance Matching Based Control for the Resonance Damping of Microgrids with Multiple Grid Connected Converters

Tan¹,

Geng²,

Yang³

2016

Journal of Power Electronics

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“…Typical applications of proportional i C1 feedback can be found in [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. For 1 storder derivative feedback of u C1 , a high-pass filter (HPF) with a similar response is an alternative solution [35].…”

Section: Ad Subject To Different Options Of Single Statementioning

confidence: 99%

“…Filter-based AD improves stability by adding a digital filter next to the current controller [11][12][13][14][15][16]. For feedbackbased AD, the state used for feedback can be the capacitor current [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32], the capacitor voltage [33][34][35][36], the inverterside current [37], the grid current [38][39][40][41] or a combination of multiple states [42][43][44][45][46][47][48][49][50]. Among the feedback-based AD methods, proportional feedback of capacitor current is widely studied during last decade due to its simple implementation.…”

Section: Introductionmentioning

confidence: 99%

LCL-resonance damping strategies for grid-connected inverters with LCL filters: a comprehensive review

Xie

2017

J. Mod. Power Syst. Clean Energy

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Grid-connected LCL-filtered inverters are commonly used for distributed power generators. The LCL resonance should be treated properly. Recently, many strategies have been used to damp the resonance, but the relationships between different damping strategies have not been thoroughly investigated. Thus, this study analyses the essential mechanisms of LCL-resonance damping and reviews state-of-the-art resonance damping strategies. Existing resonance damping strategies are classified into those with single-state and multi-state feedback. Singlestate feedback strategies damp the LCL resonance using feedback of a voltage or current state at the resonance frequency. Multi-state feedback strategies are summarized as zero-placement and pole-placement strategies, where the zero-placement strategy configures the zeros of a novel state combined by multi-state feedback, while the poleplacement strategy aims to assign the closed-loop poles freely. Based on these mechanisms, an investigation of single-state and multi-state feedback is presented, including detailed comparisons of the existing strategies. Finally, some future research directions that can improve LCL-filtered inverter performance and minimize their implementation costs are summarized.

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“…APF containing two voltage inverters and medium voltage transformer Tr1 with a vector group of Dy5 compensates harmonic current drawn by the non-linear load in the form of Th12 converter. The chokes at the output of the inverter with the C capacitors and the leakage inductance of the transformer Tr1 form LCL filter type [17,18] in each phase.…”

Section: Description Of the Input Circuit Of Activementioning

confidence: 99%

Current control with asymmetrical regular sampled pulse width modulator applied in parallel active filter

Płatek

Osypiński²

2016

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. This paper presents an analysis of the properties of pulse width modulator with a single (symmetrical regular sampled PWM) and double (asymmetrical regular sampled PWM) control sampling of the input signal (low-frequency control input wave) in presence of a triangular auxiliary signal. In this paper, a comparison of the characteristics of these modulators used in the control system with a linear proportional controller is presented. The article provides the relations derived for the maximum amplification of regulators for which the control system operates stably. Analysis results have been confirmed by simulation and experimental studies of a commercial active filter installed in an industrial plant. Simulation studies show an increase of the critical proportional controller gain with symmetrical regular sampled PWM with a doubled number of samples in the period of the triangular auxiliary signal for which the control system is stable. Also, the analysis included in this article demonstrates the possibility of increasing the value of the gain of the proportional controller in a closed system with asymmetrical regular sampled PWM. Publications [8][9][10][11][12][13][14] devoted to applications in power electronics systems with the asymmetrical regular sampled PWM are not related to control systems with a proportional controller. From the point of view of the topics covered in this article, the most interesting paper is publication [15]. This paper addresses the digital control system with asymmetrical regular sampled PWM with different types of controllers, but the issues critical to the gain of the proportional controller addressed in the present article are not discussed.One of the objectives of the work presented is to compare the dynamic and static properties of the control system with a proportional controller and symmetrical regular sampled or asymmetrical regular sampled PWM.Carried out in this article is an analysis taking into account the time between the instant of measurement of the controlled value and the actual determination of the magnitude of the sampled reference (PWM computation delay [15]).Control system with proportional controller has non-zero value of disturbance error. From the point of view of minimizing the disturbance errors and the reducing the time of decay of transient component of this error advantages of asymmetrical regular sampled PWM compared to the symmetrical regular sampled PWM manifest themselves only under the condition of an appropriately small value of the PWM computation delay.The article also describes a mechanism allowing for elimination of the impact of this error on the output current of the APF. This is a feature of APF with supervisory system of DC link voltage which allows the use of output current proportional controller.

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A Simple Voltage Sensorless Active Damping Scheme for Three-Phase PWM Converters With an $LCL$ Filter

Cited by 258 publications

References 17 publications

Impedance Matching Based Control for the Resonance Damping of Microgrids with Multiple Grid Connected Converters

Impedance Matching Based Control for the Resonance Damping of Microgrids with Multiple Grid Connected Converters

LCL-resonance damping strategies for grid-connected inverters with LCL filters: a comprehensive review

Current control with asymmetrical regular sampled pulse width modulator applied in parallel active filter

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