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 proportional-integral inner loop is stabilized by using an inherent one-beat delay achieved by digital controller.
The grid-connected inverter, which is essentially a voltage-source inverter (VSI) with voltage input and current output, is the core of grid-connected power systems. The most important indexes for measuring the grid-connected inverter are total harmonic distortion (THD) of the grid current and the grid power factor (PF) [5, 6].
The main circuit topology is a single-phase grid-connected inverter with LCL filter. The repetitive dual-loop control method is adopted. The outer loop is controlled by the RC, which makes the grid-connected current ig track the sinusoidal reference iref without a steady-state error.
The repetitive dual-loop control method is adopted. The outer loop is controlled by the RC, which makes the grid-connected current ig track the sinusoidal reference iref without a steady-state error. The PI control method is applied in the inner loop, which can increase the damping of the system to suppress the resonance peak.
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As to the concrete topology of three-phase LCL type grid-connected inverter with damping resistance, mathematical model was deduced in detail, using method of equivalent …
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A novel repetitive dual-loop control scheme of a grid-connected inverter with an LCL filter is proposed in this paper to realize precise control of grid-connected inverters.
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As to the concrete topology of three-phase LCL type grid-connected inverter with damping resistance, mathematical model was deduced in detail, using method of equivalent …
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Grid connected inverter can attenuate high frequency harmonics effectively through an LCL filter which has potential benefits for the inverter to get higher harmonic performance with lower …
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A dual closed-loop feedforward control strategy is proposed for the current inner loop and voltage outer loop in the rotating coordinate system. The correctness of the inverter …
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The dual-loop control strategy for grid-connected in-verter with LCL filter in this paper can be used to control the currents of three phase grid-connected inverter, and it will let …
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For the grid-connected inverter, the small-signal analysis and impedance method are used to analyze the stability of the system, including the influence of the PLL and the …
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As the core device of the new energy production system, the grid-connected inverter plays a crucial role in transforming new energy into electrical energy. Regarding the …
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As to the concrete topology of three-phase LCL type grid-connected inverter with damping resistance, mathematical model was …
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For the grid-connected inverter, the small-signal analysis and impedance method are used to analyze the stability of the system, …
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3.2 The Typical Dual-loop Decoupling Control for Three-phase PV Grid-connected Inverter Fig. 5 gives a typical dual-loop control topology of three-phase grid-connected processes can be …
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A nested grid forming inverter is proposed in this paper. The dual loop structure consists of proportional integral (PI) controlled outer voltage loop and finite control set model …
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