A Current Control Method for Grid-Connected Inverters

Zhang, Wenping; Wang, Yiming; Xu, Po; Li, Donghui; Liu, Baosong

doi:10.3390/en16186558

Cited by 3 publications

(2 citation statements)

References 23 publications

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“…The bandwidth of the current control loop should be one-tenth of the switching frequency. Considering that the current grid-connected DG mostly adopts 10~20 kHz as the switching frequency [30], it can be seen that the bandwidth of the current control loop should be 1~2 kHz. At present, the current loop control loop adopts the decoupling control design under the dq coordinate system, and its basic structure is shown in Figure 9.…”

Section: Current Loop Analysismentioning

confidence: 99%

An Anti-Islanding Protection Method Based on Voltage-Synchronous Impedance Angle Measurements

Yang,

Lei,

Chen

et al. 2023

Energies

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Grid-tied distributed generators (DGs) need to be equipped with anti-islanding protection to avoid the impact of unplanned islanding, which would affect system stability, auto-reclosing, and personal safety. Among the active anti-islanding protections, impedance measurements based on signal injection have the advantages of a low non-detection zone (NDZ) and are less prone to maloperation during grid disturbances; however, there are problems with signal interference in multi-DG systems. Hence, the impedance angle measurement method with signals injected synchronously is proposed. In this method, each DG injects phase-coherent signals to detect islanding using zero-cross points of the voltage (ZCPV) to avoid the protection failures caused by signal interference. An islanding identification criterion based on the measured impedance angle is proposed by analyzing the impedance characteristics of grid connection and islanding, which avoids the influence of variation of the DG operation state on islanding detection. Finally, we present a signal injection strategy and performance analysis in combination with an existing DG control platform, avoiding additional hardware investment. RTDS-based simulation verification shows that the proposed method can 100% avoid DG maloperation due to voltage and frequency disturbances during grid-connected operation and exit operation within 2 s when islanding occurs.

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Section: Current Loop Analysismentioning

confidence: 99%

An Anti-Islanding Protection Method Based on Voltage-Synchronous Impedance Angle Measurements

Yang,

Lei,

Chen

et al. 2023

Energies

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“…The SCCA can effectively improve the quality of the power. In references [24][25][26][27][28], by injecting a certain percentage of the negative-sequence current component into the grid-connected current, the double-frequency fluctuations of the DC bus are reduced. However, injecting negative sequence current components will consume a huge amount of funds.…”

Section: Introductionmentioning

confidence: 99%

Research on the Control Method of the PV Grid-Connected Inverter under an Asymmetrical Power Grid Fault

Tian,

Lu,

Wang

et al. 2023

Energies

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The negative-sequence current component and harmonic components generated when an asymmetrical fault occurs in the power grid seriously affect the normal operation of the photovoltaic (PV) grid-connected inverter. In order to suppress the negative-sequence current component and the harmonic component of the grid-connected current, and to meet the normal grid-connected operation requirements of the PV grid-connected inverter when asymmetrical faults occur in the grid, this paper proposes the proportional integral double-resonant (PI-DR) current controller, which consists of the PI controller and double-resonant controllers. The PI-DR current controller can directly control the negative-sequence current component and the grid-connected current harmonic component in the output current in the forward synchronous rotating coordinate system, without decomposing the positive and negative sequence currents. The PI-DR current controller ensures that the PV grid-connected inverter can realize normal grid-connected operation and improves the quality of the power when an asymmetrical fault occurs in the power grid. MATLAB/Simulink experiments show that the PI-DR current controller can improve the dynamic characteristics of the PV grid-connected inverter and improve the operating capability of the system when an asymmetrical fault occurs in the power grid.

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An operating mode control method for photovoltaic (PV) battery hybrid systems

Zhang,

Wang,

et al. 2024

Front. Energy Res.

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Depending on the PV power, load power, and battery status, the system may operate in different modes. The control loop may have to switch between operating modes. In practice, it is difficult to implement control loop switching because the transition and dynamic process are difficult to control. As a result, this paper presents a generalized mode control method that avoids loop switching across modes. First, system structure and topology are introduced. The operating conditions for both grid-connected and off-grid modes are then divided into six sub-cases. Furthermore, the control architecture, control loop, and reference transition for various scenarios are described. Finally, an experimental platform is built, and the results are presented to verify the proposed method.

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A Current Control Method for Grid-Connected Inverters

Cited by 3 publications

References 23 publications

An Anti-Islanding Protection Method Based on Voltage-Synchronous Impedance Angle Measurements

An Anti-Islanding Protection Method Based on Voltage-Synchronous Impedance Angle Measurements

Research on the Control Method of the PV Grid-Connected Inverter under an Asymmetrical Power Grid Fault

An operating mode control method for photovoltaic (PV) battery hybrid systems

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