Abstract: Grid-connected inverters play a pivotal role in integrating renewable energy sources into modern power systems. However, the presence of unbalanced grid conditions poses significant challenges to the stable operation of these inverters.
When the grid-connected inverter system is in steady state, the control system d q -frame is aligned with the grid system d q -frame.
The control design of this type of inverter may be challenging as several algorithms are required to run the inverter. This reference design uses the C2000 microcontroller (MCU) family of devices to implement control of a grid connected inverter with output current control.
Although the aforementioned references [12, 13, 14, 15, 16, 17] have made improvements to the performance of grid-connected inverters in weak grid environments from various perspectives, they struggle to balance the steady-state and dynamic characteristics of the system under significant grid impedance fluctuations.
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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 …
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Vinv and Vg are the output voltage of the full-bridge inverter and the grid voltage, lout is the inverter output current. The grid connected inverter output terminal is connected …
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In order to improve the grid connection control performance of the inverter under non-ideal operating conditions, the control strategy of single-phase five-level inverter with …
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Therefore, this paper establishes the output impedance model of the grid-connected inverter with full feedforward capacitor voltage including phase-locked loop, and then proposes …
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To analyze this multi-input multi-output system, a simplified stability analysis method based on the generalized Nyquist stability criterion and matrix theory is proposed. …
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Under weak-grid condition, the mismatch degree between grid impedance and inverter output impedance can increase, which will lead to inverter instability. Compared with …
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In the experiments, the peak current control (PCC) method is applied to control both the active and reactive power injected into the grid by the modified 17-levels grid-connected …
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Grid-connected inverters play a pivotal role in integrating renewable energy sources into modern power systems. However, the presence of unbalanced grid conditions poses …
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In this paper, a novel bilateral active damping strategy (BADS) for two-stage grid-connected converters with PV output fluctuations under weak grid conditions is proposed. In …
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The grid-connected control system experiences time delay and bears uncertainty due to system-modeling errors and changes in operating conditions (such as generator output, …
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This approach ensures stable control of the grid-connected inverter under weak grid conditions and significant grid fluctuations. Finally, a 500-kW current-type grid-connected …
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In grid-connected photovoltaic systems, a key consideration in the design and operation of inverters is how to achieve high efficiency with power output for different power …
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A comprehensive stability analysis for grid-connected inverter systems is performed based on the stability region. Firstly, the multi-parameter SSSR of the grid-connected inverter …
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This study introduces an improved modulated model predictive control (IM2PC) method for grid-connected inverters. By utilizing a fixed-time observer (FTO), the proposed …
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Unlike conventional fossil-fuel-based power plants, RESs generate power that depends heavily on environmental conditions. This dependency leads to fluctuations in power …
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