Robust Delay Compensation Strategy for LCL-Type Grid-Connected Inverter in Weak Grid

Ding, Xin; Xue, Ruinan; Zheng, Tianzhi; Kong, Fannie; Chen, Yanming

doi:10.1109/access.2022.3176957

Cited by 10 publications

(2 citation statements)

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“…Consequently, the connected power grid frequently exhibits non-ideal conditions, including voltage 10.3389/fenrg.2024.1378808 drops, imbalances, and harmonic distortions (Liu R. et al, 2022). In contrast to traditional thermal generating units, new energy generation equipment, owing to their limited capacity, is more susceptible to non-linear load variations and unbalanced conditions (Chen et al, 2022;Ding et al, 2022). Instantaneous faults in the power grid can result in rapid voltage reductions that render common control strategies inadequate for meeting grid-connected inverter requirements.…”

Section: Introductionmentioning

confidence: 99%

Enhancing grid-connected inverter performance under non-ideal grid conditions: a multi-functional multiplexing control strategy

Bao,

Zhang

2024

Front. Energy Res.

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Compared to the traditional thermal power generation, new energy sources, such as wind and photovoltaic systems, are more vulnerable to the effects of non-ideal power grids due to their limited capacity. This susceptibility can jeopardize the safe operation of power equipment, degrade power output quality, and lead to non-compliance with grid-connected specifications. The LCL-type grid-connected inverter is a typical nonlinear system that weakens the controllability of the grid-connected energy. To address these challenges, this study employs feedback linearization theory to transform the inverter into a standard linear system. Subsequently, it utilizes linear system methodologies to develop robust control laws, ultimately introducing a multi-functional multiplexing control strategy for grid-connected inverters based on feedback linearization and Hamilton-Jacobi-Issacs inequality. Simulation results demonstrate that this multi-functional strategy outperforms traditional grid-connected inverter control schemes, effectively mitigating issues related to low short-circuit ratios, voltage fluctuations, imbalances, harmonics, and other non-ideal grid conditions. Furthermore, it significantly expands the system’s adaptability to varying weak grid impedances.

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Section: Introductionmentioning

confidence: 99%

Enhancing grid-connected inverter performance under non-ideal grid conditions: a multi-functional multiplexing control strategy

Bao,

Zhang

2024

Front. Energy Res.

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“…Improved current control technique using a quasi-PR current controller for load compensation using LCL filter is implemented in ref. [26]. But, decoupled dual-loop control is not realised to improve the system stability under ideal and non-ideal grid voltage conditions.…”

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confidence: 99%

Control of distribution static compensator with active damped inductor‐capacitor‐inductor filter using dual loop αβ‐frame current controllers for power quality improvement

Arunagiri

Rajpurohit

Jain

2022

IET Energy Syst Integration

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A distribution system is connected with many non-linear loads, and generated harmonies are mitigated by using distribution static compensator (DSTATCOM) which is coupled at the point of common coupling through a voltage source inverter (VSI) and filter circuit. High-frequency switching ripples are generated along with the output of the VSI during pulse width modulation switching. Inductor-capacitor-inductor (LCL) filter is used to suppress the high frequency switching noises. Still, the primary concern about the LCL filter is generation of resonance peak at the resonance frequency. The conventional synchronous reference frame dq current controller with LCL filter has a complex coupling between d and q axis; hence decoupling is very difficult. This research article presents a new technique based on active damped dual loop αβ-frame current controllers to control the DSTATCOM with LCL filter for achieving improved load compensation. The dual loop controller is enhanced by using capacitor current in the inside loop and grid current at the outside loop with proportional resonant (PR) regulator parallel with harmonic compensator (HC). The proposed method effectively dampens the resonance peak under stationary reference frame ðαβÞ: The PR controller offers unlimited gain at the fundamental frequency and HC can offer more gain at the specific harmonic frequencies. Hence, characteristics of the PR and HC controllers used together to achieve minimum steady-state error and the problematic decoupling are ignored. The complete DSTAT-COM model with proposed control scheme is discussed with PR and (PR + HC) controllers separately under balanced, unbalanced source voltage. Stability analysis is carried out through Bode and pole-zero plots to judge the performance of the proposed current controllers. The obtained results, including total harmonic distortion of the source current, are compared with conventional passive damped dq-frame current controller. K E Y W O R D Scurrent controller, distribution static compensator, harmonic compensator and pulse width modulation, power quality | INTRODUCTIONIn a distribution system (DS), the term power quality (PQ) means achieving a better quality of power with a reliable supply and improved quality in the voltage and current waveform. But various non-linear loads and apparatus are connected to the system; hence, harmonics are generated and affect the consumers. Many conflicts such as impulses, voltage sag, swell, notches, and unbalances in the voltage and current are degrading the quality of power. Therefore, to improve the PQ, compensation devices and technologies have been developed. Custom power devices (CPD) are classified as shunt and series connected devices [1]. Among, distribution static compensator (DSTATCOM) is a shunt-connected expedient used to obtainThis is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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DC Current Outer Loop Control of Power Conversion System Based on Optimized First-Order Active Disturbance Rejection Control

Huang,

Xie,

Wang

2024

Lecture Notes in Electrical Engineering

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Robust Delay Compensation Strategy for LCL-Type Grid-Connected Inverter in Weak Grid

Abstract: Date of publication xxxx 00, 0000, date of current version xxxx 00, 0000.

Cited by 10 publications

References 35 publications

Enhancing grid-connected inverter performance under non-ideal grid conditions: a multi-functional multiplexing control strategy

Enhancing grid-connected inverter performance under non-ideal grid conditions: a multi-functional multiplexing control strategy

Control of distribution static compensator with active damped inductor‐capacitor‐inductor filter using dual loop αβ‐frame current controllers for power quality improvement

DC Current Outer Loop Control of Power Conversion System Based on Optimized First-Order Active Disturbance Rejection Control

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