Inverter-Current-Feedback Resonance-Suppression Method for LCL-Type DG System to Reduce Resonance-Frequency Offset and Grid-Inductance Effect

Zhou, Leming; Zhou, Xiaoping; Chen, Yandong; Lv, Zhipeng; He, Zhixing; Wu, Wenhua; Yang, Ling; Yan, Kui; Luo, An; Guerrero, Josep M.

doi:10.1109/tie.2018.2795556

Cited by 76 publications

(46 citation statements)

References 26 publications

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“…In addition, the ICF scheme can also be regarded as a virtual impedance in series with L 1 when G ad_i1 is a firstorder HPF, [107]. Hence, the expression of virtual impedance is given as…”

Section: ) Inverter-side Current Feedbackmentioning

confidence: 99%

“…However, the control bandwidth of the system is narrowed to some extent [110], and the dynamic performance is poor for the system with low resonance frequency [112]. Note that, the first-order HPF-based damping method is equivalent to a virtual impedance in parallel with the filter capacitor, as follows [107], [113]:…”

Section: ) Grid-side Current Feedbackmentioning

confidence: 99%

“…Unlike the predictive techniques and the filter-based compensation approaches, the modified sampling methods can be more intuitively and easily utilized to reduce delay to a certain extent, which mainly consist of the multiple sampling [95], [107], [145]- [147], shifting the sampling instant [91], [148], shifting the updating instant of reference voltage [149] and dual sampling modes [120]. The control delay can be reduced by multiple sampling method with enlarged sampling frequency [145], thereby the stability region of the system is widen [146].…”

Section: Application Issues Of Filter-and State Feedback-based Dammentioning

confidence: 99%

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Modeling and Stability Analysis of $LCL$ -Type Grid-Connected Inverters: A Comprehensive Overview

et al. 2019

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Due to the advantages of superior harmonics attenuation ability and reduced size, the LCL filter has been widely adopted to interface between the inverter and the grid for improving the quality of injected grid currents. However, the high-order characteristics and various constraints of the LCL filter complicate the filter design. Moreover, the stability of the internal current control loop of the individual inverter is susceptible to the inherent LCL-filter resonance peak. Meanwhile, the overall system stability would be aggravated by the external interactions between the inverter and the weak grid as well as among the paralleled inverters. Both the LCL-filter resonance peak and two types of interaction would cause severely distorted grid currents. Motivated by the existing problems, a comprehensive review on the modeling and stability analysis of the LCL-type grid-connected inverters is conducted in this paper. Concretely, the generalized parameter constraints of the LCL filter are outlined to facilitate the passive components selection, and the magnetic integration techniques of filter inductors are also introduced to reduce the weight and size of filter for increasing the power density of the system. Then, the various damping methods for enhancing the individual internal stability and the relevant application issues are also discussed. Furthermore, the impedance-based method for evaluating the system-level interactive stability is subsequently reviewed, with the emphasis on different modeling methods of inverter output impedance and online impedance measurement techniques. Finally, the future research trends on the modeling and stability analysis of LCL-type grid-connected inverters are also presented. INDEX TERMS LCL-filter, grid-connected inverters, parameters design, magnetic integration, damping methods, delay, stability, impedance-based stability analysis, impedance modeling, impedance measurement. I. INTRODUCTION Recently, the distributed power generation systems (DPGS), as shown in Fig. 1, have been widely utilized for renewable energy integration, such as solar, wind, and fuel cell, which greatly alleviate the energy crisis and environmental problems [1]-[5]. Grid-connected inverters controlled by pulse-width modulation (PWM) techniques play the key roles The associate editor coordinating the review of this article and approving it for publication was Madhav Manjrekar.

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“…In addition, the ICF scheme can also be regarded as a virtual impedance in series with L 1 when G ad_i1 is a firstorder HPF, [107]. Hence, the expression of virtual impedance is given as…”

Section: ) Inverter-side Current Feedbackmentioning

confidence: 99%

Section: ) Grid-side Current Feedbackmentioning

confidence: 99%

Section: Application Issues Of Filter-and State Feedback-based Dammentioning

confidence: 99%

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Modeling and Stability Analysis of $LCL$ -Type Grid-Connected Inverters: A Comprehensive Overview

et al. 2019

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“…The filter of the converter is a third-order system in the inverter state and it is easy to lose stability during operation. To realize the smooth operation of the system, the resonant frequency f res of the third-order filter should be between 1/6 and 1/3 of the switching frequency [23][24][25]. In this paper, the switching frequency is 50 kHz, so the resonant frequency of the filter ranges from 8.3 kHz to 16.6 kHz.…”

Section: Stability In the Inverter Statementioning

confidence: 99%

Parameters Design and Optimization of a High Frequency, Interleaved, Dual-Buck, Bidirectional, Grid-Connected Converter

Cui

Wang

2019

Electronics

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In this paper, a high frequency, interleaved, dual-buck, bidirectional, grid-connected converter topology is proposed. Free from the straight-through and dead-time distortion issues, both higher switching frequency and power density can be achieved. Due to the interleaved technique, the current ripple and stress for inductors and other power devices can be effectively reduced. Moreover, a novel filter parameter design method is proposed. The method is optimized with smaller inductance, higher filtering performance, and better steady-state performance. For one thing, the performance requirements under the two states of inverter and rectifier are comprehensively considered. For another, the relationship between the performance indexes and the filter parameters is analyzed. However, the results show that the relationship between the performance indexes is contradictory. A set of optimization parameters were obtained by setting the priority of the filter performance index. The specific design process of the filter parameters is given in detail. In order to verify the rationality of the parameter design, a 5 kW prototype was built and tested. The total harmonic distortions (THDs) of the grid currents in the among grid-connected inverter, off-connected inverter, and rectifier states under full load were 2.7%, 1.2%, and 4.5%, respectively, and the power density reached 36 W/in 3 .

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“…Fortunately, some state-of-the-art improvements have been proposed to enhance the active damping performance [14]- [19]. In [14] and [15], modified sampling methods have been proposed for reducing the time of the control delay. Moreover, filter-based compensation methods also can be used to reduce the impact of the control delay, e.g., the infinite impulse response filter in [16] and the highpass filter in [17].…”

Section: Introductionmentioning

confidence: 99%

Design of Discrete-Time Backstepping Sliding- Mode Control for LCL-Type Grid-Connected Inverter

Wang

Wai

2020

IEEE Access

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This study designs a discrete-time backstepping sliding-mode control (DTBSMC) method for an LCL-type grid-connected inverter. Firstly, the dynamic model of a discrete-time three-order system is derived, and a discrete-time backstepping control method cascading with the sliding-mode control theory is designed via Lyapunov stability verification. Moreover, the system state equation is transformed into a special form by using a time-varying mapping for overcoming the difficulty of a non-causal problem. Besides, through the recursively subsystem design for the high-order LCL-type inverter, the asymptotic system stability can be ensured by step-by-step virtual control designs. In addition, the proposed method can combine both the advantages of the backstepping control method and sliding-mode control theory. Therefore, the inverter system can have strong robustness under the condition of a power grid with varied grid impedances. Finally, the effectiveness of the proposed DTBSMC method is verified by numerical simulations and experimental results in comparison with a traditional proportional-resonant (PR) method and a backstepping control method. INDEX TERMS Backstepping, sliding-mode control, discrete-time, non-causal problem, LCL filter, gridconnected inverter.

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Inverter-Current-Feedback Resonance-Suppression Method for LCL-Type DG System to Reduce Resonance-Frequency Offset and Grid-Inductance Effect

Cited by 76 publications

References 26 publications

Modeling and Stability Analysis of $LCL$ -Type Grid-Connected Inverters: A Comprehensive Overview

Modeling and Stability Analysis of $LCL$ -Type Grid-Connected Inverters: A Comprehensive Overview

Parameters Design and Optimization of a High Frequency, Interleaved, Dual-Buck, Bidirectional, Grid-Connected Converter

Design of Discrete-Time Backstepping Sliding- Mode Control for LCL-Type Grid-Connected Inverter

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