Advanced control method for VSC-HVDC systems connected to weak grids

Jasim, Omar; Dang, H.Q.S.

doi:10.1109/epe.2016.7695520

Cited by 9 publications

(4 citation statements)

References 17 publications

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“…5(a) experiences sudden collapse when the dc or active power being transmitted exceeds 85% of the rated power. It is worth emphasizing that this problem is well known when the voltage source converters operate in weak ac system and extensively investigated [38,39]. But this is beyond the scope of this paper.…”

Section: (A) Normal Operationmentioning

confidence: 97%

Controlled transition bridge converter: Operating principle, control and application in HVDC transmission systems

Adam

Alsokhiry

Abdelsalam

et al. 2018

Electric Power Systems Research

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this paper employs an amplitude modulation with sinusoidal plus third harmonic injection instead of trapezoidal modulation to operate a controlled transition bridge (CTB) converter as ac/dc and dc/ac converter terminals. With such an operation, the CTB converter may require small ac filters; thus attractive for high-voltage direct current (HVDC) transmission systems. To facilitate ac voltage control over a wide range and black-start capability, the injected 3 rd harmonic allows the cell capacitor voltages of the CTB converter to be regulated independent of the modulation index and power factor. The insertion of 3 rd harmonic into modulating signals achieves two objectives: extends the regions around voltage zeros so that the total voltage unbalanced can be distributed between the cell capacitors, thereby exploiting the bipolar capability of the full-bridge cells in each limb; and to ensure that each limb can be clamped to the positive and negative dc rails every half fundamental period independent of the modulation index to allow recharge of the cell capacitors from the active dc link. The suitability of the CTB converter for HVDC type applications is demonstrated using a two-terminal HVDC link that employs a 21-cell CTB converter, considering normal operation and ac faults.

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Section: (A) Normal Operationmentioning

confidence: 97%

Controlled transition bridge converter: Operating principle, control and application in HVDC transmission systems

Adam

Alsokhiry

Abdelsalam

et al. 2018

Electric Power Systems Research

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“…The AAC requires several controllers to regulate the active and reactive power components and each SM capacitor energy to their desired set-points. The control philosophy used in this paper is described in [45]- [48] and is applicable, not only to the MMC, but also to the AAC when modifications are made to the control strategies for SM capacitor energy regulation and AC fault ride-through as well as considering DS operation. This control philosophy is effective when the converter is connected to strong or weak AC systems during symmetrical or asymmetrical conditions, without requiring a Phase-Locked Loop (PLL).…”

Section: Converter Topology and Operationmentioning

confidence: 99%

“…The SM capacitor energy controller (SM energy management block in Fig. 4) is based on [45], [46], but has been adapted for the AAC "extended-overlap" mode. The AC side power is trimmed by using a PI controller to account for losses so that the mean of the total SM capacitor energy stored within the converter is regulated to 6N sm E nom sm , where N sm is the number of SMs per valve.…”

Section: B Sm Capacitor Energy Managementmentioning

confidence: 99%

The Alternate Arm Converter “Extended-Overlap” Mode: AC Faults

Farr

Feldman

Clare

et al. 2021

IEEE Trans. Power Electron.

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This paper presents AC fault ride-through strategies for the "extended-overlap" operating mode of the Alternate Arm Converter (AAC), which is a type of modular multilevel Voltage Source Converter (VSC) that has been proposed for HVDC transmission applications. The AAC offers several benefits over the Half-Bridge (HB) Modular Multilevel Converter (MMC), such as requiring fewer Sub-Modules (SMs) with a smaller capacitance and providing DC fault ride-through capability. Novel symmetrical and asymmetrical AC fault ride-through strategies are described and these strategies are experimentally validated by using a Small Scale Prototype (SSP).

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“…According to the model, a dual-current control scheme with positive and negative sequence current controllers is applied. An advanced dual current control method without PLL is proposed in [16]. Simplified model predictive control methods that can reduce the computational burden have been achieved in different ways [17]- [19].…”

Section: Introductionmentioning

confidence: 99%

A Novel Advanced Traction Power Supply System Based on Modular Multilevel Converter

Peng

Han

et al. 2019

IEEE Access

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Due to the attractive advantages such as modularity, scalability and excellent power quality of modular multilevel converter (MMC), converters based on MMC could be a promising alternative solution for traction transformer. A novel MMC-based advanced co-phase traction power supply system is proposed in this paper to solve power quality issues and eliminate the neutral sections in the traditional traction power supply system. And in the proposed system, a DC power transmission system is designed, which provides convenient access for distributed energies benefiting the utilization of the natural resources such as solar energy and wind energy along railways. In order to ensure the normal operation of the proposed system, nearest-level modulation considering voltage balancing is designed for MMCs. The mathematic model three-phase MMC-based rectifier is derived in detail. Based on the mathematic model, dual current-loop control is designed for the rectifier. Besides, the parallel operating traction substations suffer circulating current issue. A droop control combining with double closed-loop control is designed to deal with the problem. The correctness and feasibility of the system and its modulation and control strategies is verified through simulation and a small-scale experiment. INDEX TERMS Electrified railway, traction power supply system, modular multilevel converter (MMC), three-phase rectifier, single-phase inverter.

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Advanced control method for VSC-HVDC systems connected to weak grids

Cited by 9 publications

References 17 publications

Controlled transition bridge converter: Operating principle, control and application in HVDC transmission systems

Controlled transition bridge converter: Operating principle, control and application in HVDC transmission systems

The Alternate Arm Converter “Extended-Overlap” Mode: AC Faults

A Novel Advanced Traction Power Supply System Based on Modular Multilevel Converter

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