Design and Hardware Implementation of a H-Bridge Sub-module for Single-Phase 5-Level Cascaded Voltage Source Inverters

Morales-Caporal, Roberto; Perez-Cuapio, J. Francisco; Martínez-Hernández, Haydee Patricia

doi:10.1109/iecon48115.2021.9589872

Cited by 3 publications

(4 citation statements)

References 8 publications

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“…According to the Equations ( 5)- (7), there is no u o in the positive and negative-sequence subsystems, and u o is only determined by the zero-sequence subsystem. The positive and negative-sequence mathematical models obtained through the Park transform and the Laplace transform have been mature [11], so they will not be reiterated here.…”

Section: System Connection Form and Mathematical Modelmentioning

confidence: 99%

“…In order to realize the AC fault ride-through, the voltage-current double closed loop control strategies for the positive and negative sequence have been matured [11,18]. Whether the power or the current is controlled in the positive or negative sequence, the final instruction generated by the control loop is executed by adjusting u jp and u jn as shown in Figure 2.…”

Section: Fault Response Characteristics Under Traditional Positive An...mentioning

confidence: 99%

“…It can be seen from Equation (11) that when phase C is in a grounding fault, the amplitude of the positive-and zero-sequence component is the same, which is the rated phase-to-ground voltage. Combining Equation ( 9), the following equation can be obtained.…”

Section: Characteristic Analysis Of Single-phase Grounding Faultmentioning

confidence: 99%

“…Based on the two-level voltage source converter (VSC), reference [9] analyzes the response characteristics of unipolar DC grounding faults and bipolar DC short circuit faults, and reference [10] proposes the fault location strategy and system protection strategy. Reference [11] proposes three topology structures of SNOP, and comprehensively compares their advantages and disadvantages combined with the analysis of AC/DC fault characteristics. Reference [12] analyzes the fault characteristics of the bridge arm fault, and proposes a protection strategy based on closing the sub-module (SM) bypass switch to ensure the reliable action of the AC breaker.…”

Section: Introductionmentioning

confidence: 99%

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AC Fault Ride-Through Strategy of a Transformerless Soft Normally Open Point

Xu¹,

Huang²,

Lu³

et al. 2022

Applied Sciences

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This paper focuses on the soft normally open point (SNOP) which has no transformers and connects to the 10 kV distribution network through the arc suppression coil grounding mode. A mathematical model containing positive-, negative-, and zero-sequence components under AC fault is established by the circuit analysis and the sequence component decomposition. Then the voltage fluctuation mechanism at the DC side and the non-fault AC side caused by the zero-sequence voltage on the fault side is analyzed under the case without transformers. Taking the single-phase grounding fault as an example, the fluctuation formula of the DC voltage and AC voltage is deduced in detail. Based on the theoretical analysis, the zero-sequence control strategy and the sub-module improvement strategy of the modular multilevel converter (MMC) are proposed. A back-to-back SNOP simulation model is established in PSCAD/EMTDC. The simulation results verify the accuracy of the theoretical analysis, as well as the validity of zero-sequence control and MMC topology improvement strategies.

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Section: System Connection Form and Mathematical Modelmentioning

confidence: 99%

Section: Fault Response Characteristics Under Traditional Positive An...mentioning

confidence: 99%

Section: Characteristic Analysis Of Single-phase Grounding Faultmentioning

confidence: 99%