Robust repetitive feedback control of a three-phase grid connected inverter

Jamil, Mohsin; Sharkh, Suleiman M.; Abusara, Mohammad; Boltryk, Rosemary J.

doi:10.1049/cp.2010.0017

Cited by 11 publications

(6 citation statements)

References 19 publications

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“…Converter resonance damping is essential to maintain converter stability, facilitate high bandwidth current control, and facilitate effective mitigation of grid-induced distortion in the output current. A simple and robust technique to damp LC filter resonance can be achieved by injecting a damping voltage that is proportional to the capacitor current in the power circuit [23]. This method can be extended to the case of LCL filters.…”

Section: B Converter Resonance Dampingmentioning

confidence: 99%

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Ultra Capacitor Based Sensorless Current Control of Grid Connected Inverter for Power Quality Improvement

Ramya¹,

Ram²

2012

IOSRJEEE

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The economical and environmental impacts of fossil fuels have forced governments and society to investigate sustainable solutions. The interest has focused principally on the green and clean benefits provided by renewable energy sources. The growth rate of new renewable energy supplies being installed has reached the incredible yearly mark of approximately 30% over the last few years. Consequently, investments in research and development in the field of power electronics have increased proportionally, especially in high voltage and high power grid connected systems. This paper presents ultra capacitor based sensorless current control of a threephase inverter-based distributed generation system. a robust control scheme for high power quality grid connection of inductor-capacitor-inductor (LCL)-filtered distributed generation (DG) inverters. This paper also presents a modified adaptive Kalman filter for sensorless current control of a three-phase inverter-based distributed generation system. The control variable states can be estimated one sample in advance with a reduced number of sensors. Two current control loops with the steepest descent adaptive control for grid voltage estimation have been employed to boost robustness. Stability and dynamic performance have been examined. Simulation and results validate the proposed control approach. Simulation is done using Matlab software.

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Section: B Converter Resonance Dampingmentioning

confidence: 99%

“…Different control schemes are proposed for LCL-filtered grid connected converters [17]- [23]. Major control techniques include proportional-integral (PI) control [20], resonant controllers [11], [12], and predictive/deadbeat control [19].…”

Section: Introductionmentioning

confidence: 99%

Ultra Capacitor Based Sensorless Current Control of Grid Connected Inverter for Power Quality Improvement

Ramya¹,

Ram²

2012

IOSRJEEE

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“…The inverters with LCL filters are controlled with inverterside inductor current feedback or grid-side inductor current feedback [2]- [26] to solve for resonance problems while reduce harmonic currents. The grid-side current feedback (GCF) associated with capacitor voltage feedforward (CVF) is repetitively controlled to achieve zero steady-state error and to reduce harmonic currents injected to grid [2]- [4]. In particular, virtual impedance [5], [7], lead compensator [6], and robust control scheme [8] are used to reduce the harmonic currents and to achieve fast transient response.…”

Section: Introductionmentioning

confidence: 99%

Grid-Side Current Improvement With Direct Digital Control and Capacitor Voltage Feedforward to Mitigate Distorted Grid Currents for 3Φ3W LCL Grid-Connected Inverter Under Distorted Grid Voltages

Wu,

Chan,

Chang

et al. 2024

IEEE Open J. Power Electron.

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A three-phase three-wire LCL grid-connected inverter is usually used as an interface between renewable-energy sources and grid. However, grid voltage is always distorted and results in grid-current distortion when there is no control at the filtercapacitor current. This paper presents the grid-current improvement with inverter-side-current direct digital control and capacitor voltage feedforward (CVF) for the grid-connected inverter under distorted grid voltages. With the inverter-side current feedback, the simple direct digital control can cover inductance variation and determine the control laws to track inverter-side inductor current, achieving robustness. A hysteresis repetitive predictor with finite impulse response low-pass filter and compensator term is introduced to the CVF loop which can stabilize the system and compensate the distorted grid current. The virtual impedance method is adopted to confirm the stability when the filter inductances drop and control parameters vary with the inductor current. Simulated and experimental results from 12 kW inverter are used to verify the theoretical analyses and discussions.

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“…However, the robustness of the control system is not guaranteed due to the model-based nature of the proposed controller. To improve the harmonic distortion rejection performance, a robust repetitive feedback control of three-phase grid-connected VSIs with LCL filter is proposed in [22]. However, not all voltage disturbances are periodic by nature.…”

Section: Introductionmentioning

confidence: 99%

Robust Line-Voltage Sensorless Control and Synchronization of LCL -Filtered Distributed Generation Inverters for High Power Quality Grid Connection

Mohamed

A-Rahman

Seethapathy

2012

IEEE Trans. Power Electron.

109

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This paper presents a robust control scheme for high power quality grid connection of inductor-capacitor-inductor (LCL)-filtered distributed generation (DG) inverters. The presence of the LCL filter complicates the dynamics of the inverter control system, particularly when the uncertain nature of the grid background distortion and system parameters is considered. The proposed scheme addresses such practical difficulties by providing: 1) robust and simple active damping control performance under grid and filter parameter variation; 2) suppression of gridinduced distortion without a-priori knowledge of the grid background distortion and unbalance via real-time generation of the frequency modes and disturbances that should be eliminated from the closed-loop current control system; 3) robust deadbeat digital control performance that maximizes the dynamic performance of the converter; and 4) robustness against interaction dynamics between active damping and current tracking controllers. Furthermore, the proposed control scheme facilitates line-voltage sensorless current control and grid-synchronization performance, which enhances the reliability and cost measures of the DG interface. Theoretical analysis and comparative evaluation results are presented to demonstrate the effectiveness of the proposed control scheme.

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Robust repetitive feedback control of a three-phase grid connected inverter

Cited by 11 publications

References 19 publications

Ultra Capacitor Based Sensorless Current Control of Grid Connected Inverter for Power Quality Improvement

Ultra Capacitor Based Sensorless Current Control of Grid Connected Inverter for Power Quality Improvement

Grid-Side Current Improvement With Direct Digital Control and Capacitor Voltage Feedforward to Mitigate Distorted Grid Currents for 3Φ3W LCL Grid-Connected Inverter Under Distorted Grid Voltages

Robust Line-Voltage Sensorless Control and Synchronization of LCL -Filtered Distributed Generation Inverters for High Power Quality Grid Connection

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