Available literature concerning the control systems of LCL filtered inverters focuses on variations of the deadbeat predictive control and the PI control. Proposed strategies vary with respect to the target of control and the structure of the inner and outer loops.
In allusion to the resonance in photovoltaic grid-connected inverter with an LCL filter, a control model of inner current loop is established and its open-loop transfer function is analyzed.
Simple strategies focus on the direct control of a single variable, such as the output or inverter current (respectively at grid- or inverter-side of the filter) . A common approach comprises an outer control loop for capacitor voltage control and an inner control loop for the inverter current.
From theoretical analysis it is found that when the feedback of inverter output current is used for inner current loop control, there is an inherent damping item in the controller and this damping item is favorable to increase the damping of the control system and suppress the resonance caused by LCL filter.
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Voltage-current double closed loop control for grid-connected inverter consists of grid-connected current inner loop and grid voltage outer loop. Because the control principle is …
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Abstract In allusion to the resonance in photovoltaic grid-connected inverter with an LCL filter, a control model of inner current loop …
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This Grid Current Feedback Active Damping (GCF-AD) strategies based on high-pass filter HPF -either first order (FO) or second order (SO)- are widely used to suppress …
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The current-controlled grid-connected inverter with LCL filter is widely utilized in the distributed power generation systems at remote places with weak grids. Oscillations in weak …
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In voltage-controlled voltage source inverters (VSIs)-based microgrids (MGs), the inner control is of prime interest task for guaranteeing safe and stable operation. In this paper, …
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This paper proposes a robust strategy for regulating the grid current entering a distribution network from a three-phase VSI system connected via a LCL filter. The strategy …
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Abstract—A cascaded modular model predictive control (MMPC) method is designed for a modified non-isolated LCL grid-connected inverters to provide resonance …
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The FCS-MPC with delay compensation is introduced into the current inner loop of the control layer, and the IDM control is introduced into the voltage outer loop, so as to make …
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Abstract In allusion to the resonance in photovoltaic grid-connected inverter with an LCL filter, a control model of inner current loop is established and its open-loop transfer …
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For grid-type inverters controlled by traditional current sources in weak grids, the traditional power loop control cannot accurately track the POC voltage, so it cannot accurately …
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Abstract To reduce current harmonics caused by switching frequency, T-type grid-connected inverter topology with LCL filter is …
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In voltage-controlled voltage source inverters (VSIs)-based microgrids (MGs), the inner control is of prime interest task for …
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The paper presents a controller design for grid-connected inverters (GCI) with very small dc-link capacitance that are coupled to the grid via an LCL filter. The usual controller …
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Available literature concerning the control systems of LCL filtered inverters focuses on variations of the deadbeat predictive control and the PI control. Proposed strategies vary …
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In this paper the design of synchronous frame DQ control based double loop control for single phase inverter in distributed generation system is proposed. For synchronous frame …
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This paper has analyzed in detail the implementation principles and process of the three-phase LCL grid-tied inverter, and has adopted the dual closed-loop feedforward control …
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In this paper, a novel dual closed-loop repetitive control strategy based on grid current feedback is proposed for single-phase grid-connected inverters with LCL filters. The …
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The paper presents a controller design for grid-connected inverters (GCI) with very small dc-link capacitance that are coupled to the grid via an LCL filter. The usual controller …
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For standalone operation, a dual-loop control system with PR-controller for outer voltage loop and a P-controlled for inner current loop is proposed to limit peak current …
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