Modeling, control, and protection of modular multilevel converter-based multi-terminal HVDC systems: A review

Zhang, Lei; Zou, Yuntao; Yu, Jicheng; Qin, Jiangchao; Vittal, Vijay; Karady, G.G.; Shi, Di; Wang, Zhiwei

doi:10.17775/cseejpes.2017.00440

Cited by 178 publications

(70 citation statements)

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“…where i ac is the amplitude of phase current in the AC side of converter, i dc represents the current measured at positive pole of the converter shown in Figure 1, and the ∆t c is protection time from reclosing time to the trip time of the DCCB. By substituting (4) into (3), the following inequality can be obtained as Equation (5). Define the value satisfying the equation condition of (5) as the critical resistance R 0 .…”

Section: The Calculation Methods Of Rclrmentioning

confidence: 99%

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A Novel Overcurrent Suppression Strategy during Reclosing Process of MMC-HVDC

Jiang

Gong

2019

Applied Sciences

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A modular multilevel converter based high-voltage DC (MMC-HVDC) system has been the most promising topology for HVDC. A reclosing scheme is usually configured because temporary faults often occur on transmission lines especially when overhead lines are used, which often brings about an overcurrent problem. In this paper, a new fault current limiter (FCL) based on reclosing current limiting resistance (RCLR) is proposed to solve the overcurrent problem during the reclosing process. Firstly, a mesh current method (MCM) based short-circuit current calculation method is newly proposed to solve the fault current calculation of a loop MMC-HVDC grid. Then the method to calculate the RCLR is proposed based on the arm current to limit the arm currents to a specified value during the reclosing process. Finally, a three-terminal loop MMC-HVDC test grid is constructed in the widely used electromagnetic transient simulation software PSCAD/EMTDC and the simulations prove the effectiveness of the proposed strategy.

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Section: The Calculation Methods Of Rclrmentioning

confidence: 99%

“…Currently, the half-bridge sub-module (HBSM) is the main topology of a practical MMC-HVDC grid because of better economy [5]. When a short-circuit fault occurs on the DC line, very large fault currents will be caused in the DC lines and converters [6].…”

Section: Introductionmentioning

confidence: 99%

A Novel Overcurrent Suppression Strategy during Reclosing Process of MMC-HVDC

Jiang

Gong

2019

Applied Sciences

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“…Hence, HVDC protection systems have to ensure safety and minimize fault impact and component stress. In order to do so, protection systems must operate satisfying some performance requirements Zhang et al, 2017):…”

Section: Protection Requirementsmentioning

confidence: 99%

Challenges for Protection of Future HVDC Grids

et al. 2020

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Nowadays, High Voltage Direct Current (HVDC) transmissions are gaining relevance in long distance and renewable energy integration projects over the conventional Alternating Current (AC) transmissions due to several advantages as improved flexibility and independent active and reactive power controllability. Despite that, the high currents and voltage collapses generated by fault conditions in HVDC systems imply some unresolved technical challenges regarding the detection, location and clearance of faults. Faults have to be cleared in a very short time range in order to minimize their impact on the system. For this objective, very fast protection algorithms and reliable HVDC circuit breakers are required. This paper focuses on the technical challenges and limitations of HVDC protection systems. This way, protection requirements and different types of measurement devices are considered. Protection algorithms are classified into local-measurement-based and communication-based, highlighting the most important characteristics. In addition, the different technologies of HVDC circuit breakers are compared. Finally, the characteristics and effects of the different available fault-clearing strategies are presented.

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“…Moreover, the single terminal used as balanced terminal must be sized to cope with all power variations situations. This result is a weakness of the entire system since if the master converter is lost, the MTDC system will be no longer regulated and collapses [8].…”

Section: Mtdc Control Strategiesmentioning

confidence: 99%

Small-Scale Modular Multilevel Converter for Multi-Terminal DC Networks Applications: System Control Validation

Louokdom

Gavin

Siemaszko³

et al. 2018

Energies

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This paper presents the design and implementation of a digital control system for modular multilevel converters (MMC) and its use in a 5 kW small-scale prototype. To achieve higher system control reliability and multi-functionality, the proposed architecture has been built with an effective split of the control tasks between a master controller and six slave controllers, one for each of the six arms of the converter. The MMC prototype has been used for testing both converter and system-level controls in a reduced-scale laboratory set up of a Multi-Terminal DC transmission network (MTDC).The whole control has been tested to validate the proposed control strategies. The tests performed at system level allowed exploration of the advantages of using an MMC in a MTDC system.

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Modeling, control, and protection of modular multilevel converter-based multi-terminal HVDC systems: A review

Cited by 178 publications

References 0 publications

A Novel Overcurrent Suppression Strategy during Reclosing Process of MMC-HVDC

A Novel Overcurrent Suppression Strategy during Reclosing Process of MMC-HVDC

Challenges for Protection of Future HVDC Grids

Small-Scale Modular Multilevel Converter for Multi-Terminal DC Networks Applications: System Control Validation

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