Sequence-Based Control Strategy With Current Limiting for the Fault Ride-Through of Inverter-Interfaced Distributed Generators

Mahamedi, Behnam; Eskandari, Mohsen; Fletcher, John; Zhu, Jun

doi:10.1109/tste.2018.2887149

Cited by 121 publications

(77 citation statements)

References 33 publications

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“…8 is formed with the positive and negative sequence current component. It illustrates the peck detection mechanism through the proposed technique, which proves to be fast and accurate over the literature reported in [48] and the rms based detection. Slight frequency is varied at time 1.1s in Fig.…”

Section: Proposed Current Limiter For MMCmentioning

confidence: 76%

“…Due to the presence of negative sequence double frequency components, peak detection is not straightforward. RMS based peak detection requires one complete cycle, whereas the one reported in [48], needs to perform differentiation for peak detection. This work detects the peak using a more straightforward approach.…”

Section: Proposed Current Limiter For MMCmentioning

confidence: 99%

“…Due to oscillation in the dq frame, peak detection is not straightforward. RMS and derivativebased peak detection techniques for the current limiter were discussed in [47], [48]. However, RMS calculation is complex and takes one complete cycle, which allows the surge current to pass the semiconductor switch and hence, device failure or shutdown from overheating.…”

Section: Introductionmentioning

confidence: 99%

“…However, RMS calculation is complex and takes one complete cycle, which allows the surge current to pass the semiconductor switch and hence, device failure or shutdown from overheating. On the other hand, the work [48] requires differentiation of the incoming signal, which could introduce error in the calculation out of noise amplification. Besides, the current limiter is performed in the abc frame where the real and reactive current are not possible to separate.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Positive-Negative Sequence Current Controller for LVRT Improvement of Wind Farms Integrated MMC-HVDC Network

Hossain

Abido

2020

IEEE Access

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Positive and negative sequence based current control strategy is developed for the modular multilevel converter (MMC), which complies with the grid code requirements during the balanced and unbalanced faults at the point of common coupling of AC grids. This research proposes an efficient and simplified current limiting technique to keep the inverter individual phase current at a predefined threshold during faults. In this work, the current controller of the MMC converter is designed based on stationary reference frame while positive sequence synchronous reference frame is used to design the current limiter. The proposed work considers the complete dynamics of permanent magnet synchronous generator (PMSG) and doubly fed induction generator (DFIG) based wind energy. The MMC aggregate model is developed and simulated in Matlab/Simulink. The MMC model is also developed using real-time digital simulation (RTDS). A comparative performance analysis between the proposed and the conventional current limiter is provided where the proposed sequence-based current controller with the current limiter shows promising performance under severe disturbances. Besides grid compliance, the results with the proposed control scheme demonstrate the improvement of low voltage ride-through capability without any violation of converter current and HVDC link voltage limits.

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Section: Proposed Current Limiter For MMCmentioning

confidence: 76%

Section: Proposed Current Limiter For MMCmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Positive-Negative Sequence Current Controller for LVRT Improvement of Wind Farms Integrated MMC-HVDC Network

Hossain

Abido

2020

IEEE Access

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“…One classical VOC is implemented in the positive and negative synchronous reference frame, where the unbalanced ac signals in the stationary reference frame are transferred to the DC signals in the positive and negative synchronous reference frame [5,6], respectively. Then, dual proportional-integral defined control targets.…”

Section: Introductionmentioning

confidence: 99%

Voltage Modulated DPC Strategy of DFIG Using Extended Power Theory under Unbalanced Grid Voltage Conditions

Cheng

Ning

et al. 2020

Energies

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This paper develops a voltage modulated direct power control (VM-DPC) strategy of a doubly fed induction generator (DFIG) using extended power theory under unbalanced grid voltage conditions. By introducing the modulated voltage of the active and reactive powers and the non-linear VM controller, the proposed VM-DPC strategy enables the generator dynamics to change from the time-varying differential equations into the time-invariant ones. Then, in order to deal with the voltage unbalance, three available power feedbacks, a combination of real active power and extended reactive power, a combination of extended active power and real reactive power, a combination of extended active power and extended reactive power, are developed. Together with a conventional controller (PI + R and feedforwards) and a non-linear VM controller, the power feedbacks are well controlled to track their references with the achievement of the constant active power, the constant reactive power and the balanced stator current. The main advantage of the VM-DPC strategy is the introduction of the modulated voltage and the non-linear VM controller making the generator dynamics time-invariant, which is easy for applying various control methods. Furthermore, the application of extended power can avoid the sequence extractions and the power compensations under unbalanced grid voltage. Finally, the simulation results demonstrate the effectiveness of the developed VM-DPC strategy.

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Fault Control Strategy of Grid‐Forming Converter Considering the Voltage Support of Faulty Phase

Guo

Feng

Yang

2023

IEEJ Transactions Elec Engng

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The grid-forming converter (GFC) is used to regulate the voltage and frequency of a local grid. However, due to the limited current capacity, the GFC must actively modify its control strategy when a serious external fault occurs, thus to avoid the possible damage caused by overcurrent. This paper proposes a novel voltage reference generation method for GFC based on the external equivalent impedance magnitude (EEIM), which has the following merits: (i) the faulty phase currents and the non-faulty phase voltage can be controlled within their operational limits. (ii) The voltage reference unbalance factor (VRUF) of the GFC can be adjusted flexibly if necessary. Then, in order to achieve the optimal support effect for the faulty phase voltages, a two-stage GFC fault control strategy is proposed in this paper. In the first stage, the fault type is judged by computing and comparing the EEIM of each phase. In the second stage, the voltage reference mode is determined according to the fault type, and the VRUF is adjusted to its optimum value through a search algorithm. Simulation results based on Matlab/Simulink verify the effectiveness of the proposed GFC fault control strategy in terms of current limiting and faulty phase voltage support.

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Sequence-Based Control Strategy With Current Limiting for the Fault Ride-Through of Inverter-Interfaced Distributed Generators

Cited by 121 publications

References 33 publications

Positive-Negative Sequence Current Controller for LVRT Improvement of Wind Farms Integrated MMC-HVDC Network

Positive-Negative Sequence Current Controller for LVRT Improvement of Wind Farms Integrated MMC-HVDC Network

Voltage Modulated DPC Strategy of DFIG Using Extended Power Theory under Unbalanced Grid Voltage Conditions

Fault Control Strategy of Grid‐Forming Converter Considering the Voltage Support of Faulty Phase

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