FRT capability of single-phase grid-connected inverter with minimized interconnected inductor

Nagai, Shigekazu; Kusaka, Keisuke; Itoh, Jun‐ichi

doi:10.1109/apec.2017.7931095

Cited by 8 publications

(1 citation statement)

References 15 publications

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“…On the other hand, the inverter output current overshoot rate becomes high during the voltage sag when the inductance of the interconnected inductor is reduced. Thus, the authors propose a high-speed gate-block method and the design of an LC or LCL filter to meet the fault ride-through (FRT) requirements (6) (7) . In particular, to meet the FRT requirements, a filter capacitor with low capacitance is designed to reduce the resonance.…”

Section: Introductionmentioning

confidence: 99%

Open-loop-based Island-mode Voltage Control Method for Single-phase Grid-tied Inverter with Minimized LC Filter

Nagai

Itoh

2019

IEEJ Journal IA

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This paper proposes an island-mode voltage control method using an open-loop control that applies a high-gain disturbance observer (DOB) for a single-phase inverter with a low-capacitance output filter. The output voltage is distorted with low capacitance obtained from the conventional method that consists of a PID regulator for an automatic voltage regulator and a PI regulator for an automatic current regulator. To compensate for the output voltage distortion, the high-gain DOB for the output voltage is applied for open-loop-based voltage control. DOB is implemented into a field-programmable gate array with high-speed sampling. In the LC filter of a 1-kW prototype, the impedance of the inductor is minimized to 1.0% of the normalized inverter impedance, whereas the admittance of the capacitor is reduced to 0.25% of the normalized inverter admittance. Using the proposed method, the inverter output voltage total harmonic distortion is reduced by 82.4% even with the diode rectifier load compared to conventional voltage control, whereas the constant output voltage is achieved regardless of load conditions.

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Section: Introductionmentioning

confidence: 99%

Open-loop-based Island-mode Voltage Control Method for Single-phase Grid-tied Inverter with Minimized LC Filter

Nagai

Itoh

2019

IEEJ Journal IA

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Grid‐connected photovoltaic inverters with low‐voltage ride through for a residential‐scale system: A review

Talha

Amir

Raihan

et al. 2020

Int Trans Electr Energ Syst

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Background: Recent advancements in solar power generation technology have paved the way for a vast number of photovoltaic (PV) systems integration into the grid network. The global installed capacity of rooftop PV systems has already surpassed a 50 GW mark in 2020, while the total installed capacity of all types of PV systems is reaching beyond 500 GW. The influx of distributed PV-generators must be equipped with sophisticated control to ensure grid stability, especially during grid faults. A devastating grid outage may occur if the grid-tied PV inverters are not equipped with the "fault-ride-through" mechanism. Many countries have already enforced a mandatory grid code which includes a low-voltage-ride through requirements for PV-generators. Aim and Objective: This paper reviews the design of a rooftop PV inverters in the light of low-voltage-ride-through requirements.Materials and Methods: For the implementation of low-voltage-ride-through (LVRT), the design of low-voltage-sag detection, grid-synchronization, filterselection, and power-controllers are examined through simulations and literature survey. LVRT implementation issues are highlighted with an emphasis on the current controller performance during grid sags.Results and Discussion: From the review and analysis conducted in this study, this paper concludes that ensuring a stable DC-link and appropriate control-reference-signals during the grid faults are the keys to the LVRT implementation. Conclusion:In addition to robust power control, an autonomous PV generator should promptly detect the grid conditions and fulfils the ancillary services

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FRT Capability of Three-phase Grid-tied Converter with Minimized Inductor

Nagai

Itoh

2019

2019 IEEE Applied Power Electronics Conference and Exposition (APEC)

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FRT capability of single-phase grid-connected inverter with minimized interconnected inductor

Cited by 8 publications

References 15 publications

Open-loop-based Island-mode Voltage Control Method for Single-phase Grid-tied Inverter with Minimized LC Filter

Open-loop-based Island-mode Voltage Control Method for Single-phase Grid-tied Inverter with Minimized LC Filter

Grid‐connected photovoltaic inverters with low‐voltage ride through for a residential‐scale system: A review

FRT Capability of Three-phase Grid-tied Converter with Minimized Inductor

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