Imbalance Compensation of the Grid Current Using Effective and Reactive Power for Split DC-Link Capacitor 3-Leg Inverter

Kim, Sun-Pil; Song, Sung-Geun; Park, Sung-Jun; Kang, Feiyu

doi:10.1109/access.2021.3085585

Cited by 12 publications

(6 citation statements)

References 35 publications

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“…from 0.9 to 1. The encountered voltage asymmetry in the LV grid was eliminated by the four-wire power conversion system, controlled independently for each phase [41,42]. In the research, this fact was omitted as negligible; phases F1 and F2 can be considered as technically separate and controlled independently.…”

Section: Boundary Conditions For Simulationsmentioning

confidence: 99%

DSO Strategies Proposal for the LV Grid of the Future

Mroczek

Pijarski

2021

Energies

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A significant challenge for the DSO (Distribution System Operator) will be to choose the optimum strategy for flexibility service in the LV area with high RES (renewable energy sources) penetration. To this end, a representative LV grid operated in Poland was selected for analysis. Three research scenarios with RES generation were presented in the range of 1–8 kW for the power factor from 0.9 to 1. The grid PV capacity was determined for four load profiles. Based on this factor, optimum RES volume management service types were determined. Under the flexibility service, the proposed power conversion services and active RES operations for DOS were proposed. The research was conducted using the Matlab and PowerWorld Simulator environment. Optimum active power values were obtained for the RES generation function for single and dual operation systems of the power conversion system. In future, the knowledge in the field of grid capacity will enable the DSO to increase the operating efficiency of the LV grid. It will enable the optimum use of the RES generation maximisation function and proper strategy selection. It will improve the energy efficiency of the power input through the MV/LV node.

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Section: Boundary Conditions For Simulationsmentioning

confidence: 99%

DSO Strategies Proposal for the LV Grid of the Future

Mroczek

Pijarski

2021

Energies

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“…The 3L-NPC converter generates a similar DC bias voltage for open switch failure across mid-MOSFETs, which makes it difficult to identify the failed MOSFET [24] - [26]. Therefore, the mid-point voltage has been utilized as a diagnosis criterion to identify the location of a switch failure in the triple-phase shift converter [27]- [29]. However, the process is slow and takes 20-25 switching cycles, whereas open switch failure across mid-MOSFETs M 21 -M 32 in 3L-NPC pole at 24kV DC causes avalanche breakdown in a single switching cycle, if it is not mitigated [30].…”

Section: Introductionmentioning

confidence: 99%

Overvoltage Protection of Series-Connected 10kV SiC MOSFETs Following Switch Failures in MV 3L-NPC Converter for Safe Fault Isolation and Shutdown

Parashar,

Isik,

Kolli

et al. 2024

IEEE Access

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This paper presents a design methodology for overvoltage protection across 10kV SiC MOSFETs during turn-off after switch failure in a MV SST Power Conditioning System (PCS) enabled by a cascaded Three-Phase (3P) Three-level (3L) Neutral Point Clamped (NPC) Active Front-End Converter (AFEC) and Dual Active Bridge (DAB) using series-connected 10kV SiC MOSFETs and 10kV SiC JBS diodes. The methodology uses an active voltage clamp at the gate terminal and desat detection technique to identify abrupt open and turn-on switch failures across series-connected 10kV SiC MOSFETs. The analytical model estimates over-current time and turn-off voltage transition by considering bus bar inductance, device base plate capacitance and common mode (CM) choke tied between the heat sink and midpoint of the DC link capacitor. The transition model is used to evaluate the turn-off timing for series-connected MOSFETs, snubber resistors, snubber capacitors, and gate resistors to avoid MOSFET overvoltage during converter shutdown, without affecting the voltage balancing and efficiency during normal operation. The MOSFET turn-off transition during the shutdown has been verified in the Saber RD simulation using the validated Saber RD MAST model of 10kV SiC MOSFETs and 10kV SiC JBS diodes at 13.8kV AC/24kV DC level. The fault isolation and MV SST PCS shutdown have been verified in a real-time environment using HIL setup with Xilinx FPGAs and RTDS, at 13.8kV AC/24kV DC link under PCS operating conditions. The normal operation of 3L-NPC pole hardware with modified snubber resistors, snubber capacitors, and gate resistors is verified by experiments conducted at 7kV DC, 10A load current.

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“…The applications of H-bridge inverters are also limited due to their size and the need for a separate dc source for each phase [29], [30]. Under these circumstances, three-level NPC inverters could be an effective alternative for the formation of three-phase four-wire microgrid as they offer reduced stresses on the switches, proper voltage sharing across the switches due to the use of clamping diodes, and good voltage balancing of the split capacitors as unbalance current flows to neutral through the switches, not through the split capacitors [31], [32], [33]. To the best knowledge of the authors, the three-level NPC inverters haven't been used for the formation of the three-phase four-wire microgrid previously.…”

Section: Introductionmentioning

confidence: 99%

Power Sharing in Three-Level NPC Inverter Based Three-Phase Four-Wire Islanding Microgrids With Unbalanced Loads

Sharma

Pankaj²,

Terriche

et al. 2023

IEEE Access

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The droop-based control schemes are widely used for power-sharing and control of the isolated microgrids. The conventional droop control scheme with inner current and voltage controllers can work effectively under ideal voltage. However, the existence of unbalance tends its performance to worsen. This paper aims to propose an enhanced droop control method to improve the power-sharing, and maintain the distributed generators' (DGs) terminal voltages and the system frequency under the balanced as well as unbalanced loads. The enhancements of the proposed control scheme include the droop controller, inner current and voltage controller, and virtual impedance loop. The proposed virtual impedance deals with the accurate sharing of powers in the case of unequal line impedance and the control of zero sequence current. Moreover, to enable the proposed control to compensate for the unbalance, three-level neutral point clamped (NPC) inverters are used to form a three-phase four-wire microgrid. With this control scheme, the voltage unbalance factors (VUFs) of the DGs' terminal voltages are reduced from 4% to less than 1%, negative sequence reactive powers, which are also an indication of unbalance, have been reduced significantly, and the system frequency is maintained within the standard permissible limit of 2.5%. Furthermore, a local load controller is also proposed to control the reactive loading of the DGs when they have local loads supplied from their terminals. The investigations have been carried out under simulation as well as lab-based environments to validate the efficacy of the proposed control method.

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Imbalance Compensation of the Grid Current Using Effective and Reactive Power for Split DC-Link Capacitor 3-Leg Inverter

Cited by 12 publications

References 35 publications

DSO Strategies Proposal for the LV Grid of the Future

DSO Strategies Proposal for the LV Grid of the Future

Overvoltage Protection of Series-Connected 10kV SiC MOSFETs Following Switch Failures in MV 3L-NPC Converter for Safe Fault Isolation and Shutdown

Power Sharing in Three-Level NPC Inverter Based Three-Phase Four-Wire Islanding Microgrids With Unbalanced Loads

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