Modular Multilevel Converter DC Fault Protection

Cwikowski, Oliver; Wickramasinghe, Harith R.; Konstantinou, Georgios; Pou, Josep; Barnes, Mike; Shuttleworth, R.

doi:10.1109/tpwrd.2017.2715833

Cited by 88 publications

(54 citation statements)

References 16 publications

(24 reference statements)

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“…The overcurrent in MMC1 is the most serious, and thus it will be taken as the example for simulation. When the RCLR R 12 is configured, the equivalent circuit in Figure 4 is modified as Figure 8 and Equation (1) is modified as Equation (6). The upper and lower limitation of the RCLR are set to 0 and 15 Ω, respectively, and the calculation step is 0.1 Ω.…”

Section: The Validation Of the Fclmentioning

confidence: 99%

“…By solving (2) and (6), the relation between the maximum arm current and the critical resistance R0 of FCL can be obtained, as shown in Figure 9. Take k = 1, k = 0.9 and k = 0.8 for examples to verify the effectiveness of the proposed calculation method.…”

Section: The Validation Of the Fclmentioning

confidence: 99%

“…By solving (2) and (6), the relation between the maximum arm current and the critical resistance R 0 of FCL can be obtained, as shown in Figure 9.…”

Section: The Validation Of the Fclmentioning

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]. Since temporary faults often occur on overhead lines, MMC-HVDC needs reclosing to improve the reliability and continuity of the power supply [7].…”

Section: Introductionmentioning

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 Validation Of the Fclmentioning

confidence: 99%

Section: The Validation Of the Fclmentioning

confidence: 99%

“…By solving (2) and (6), the relation between the maximum arm current and the critical resistance R 0 of FCL can be obtained, as shown in Figure 9.…”

Section: The Validation Of the Fclmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Jiang

Gong

2019

Applied Sciences

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“…An alternative is to bypass an MMC using its own IGBTs. This concept has been tested in a point-to-point link in [27]. This work provides significant insight into DCCB switching modeling and the impact of circulating current controllers on the recovery of an MMC.…”

Section: Introductionmentioning

confidence: 99%

Coordination of MMCs With Hybrid DC Circuit Breakers for HVDC Grid Protection

Wang

Adeuyi

et al. 2019

IEEE Trans. Power Delivery

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A high-voltage direct-current (HVDC) grid protection strategy to suppress dc fault currents and prevent overcurrent in the arms of modular multilevel converters (MMCs) is proposed in this paper. The strategy is based on the coordination of half-bridge MMCs and hybrid dc circuit breakers (DCCBs). This is achieved by allowing MMC submodules to be temporarily bypassed prior to the opening of the DCCBs. Once the fault is isolated by the DCCBs, the MMCs will restore to normal operation. The performance of the proposed method is assessed and compared to when MMCs are blocked and when no corrective action is taken. To achieve this, an algorithm for fault detection and discrimination is used and its impact on MMC bypassing is discussed. To assess its effectiveness, the proposed algorithm is demonstrated in PSCAD/EMTDC using a four-terminal HVDC system. Simulation results show that the coordination of MMCs and DCCBs can significantly reduce dc fault current and the absorbed current energy by more than 70% and 90%, respectively, while keeping MMC arm currents small.

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A Topology of H‐Type High‐Voltage DC Circuit Breaker with Current‐Limiting Function and its Control Strategy

Wang

Hou

Wang

et al. 2020

IEEJ Transactions Elec Engng

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A high-voltage direct-current circuit breaker is a key equipment to construct a flexible direct current transmission system. Most of the existing design schemes have some shortcomings such as slow fault-breaking speed, poor current-limiting effect, large capacity of the arrester, and long reclosing operation time. To solve the above problems, this paper proposes an H-type high-voltage direct current circuit breaker with a current-limiting function. The current-limiting inductance is put into operation by judging the fault condition. It has good current-limiting ability in the process of fault-breaking and can maintain the dynamic performance of the power grid in the normal operation of the system. It has the advantages of fast fault-breaking speed, buffered energy consumption, early separation of fault points, and small capacity of the arrester. During reclosing operation, the transfer branch can be turned on at no-voltage. The different working states in the process of fault-breaking are analyzed theoretically based on the description of the topological structure and working principle. Finally, using the PSCAD/EMTDC simulation platform, the functional verification and system verification of fault-breaking and the reclosing operation process is conducted. Compared with the typical scheme, the simulation analysis shows the effectiveness and applicability of the function of fast fault-breaking and fault current-limiting.

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Modular Multilevel Converter DC Fault Protection

Cited by 88 publications

References 16 publications

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

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

Coordination of MMCs With Hybrid DC Circuit Breakers for HVDC Grid Protection

A Topology of H‐Type High‐Voltage DC Circuit Breaker with Current‐Limiting Function and its Control Strategy

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