2018 # Modular Multilevel Converter DC Fault Protection

**Abstract:** -High voltage direct current grids will require the development of dc protections that provide fast fault isolation and minimize the disturbance caused to the existing ac power networks. This paper investigates how the dc fault recovery performance of a half-bridge modular multilevel converter (HB-MMC) is impacted by different dc protection design choices. A HB-MMC point-to-point HVDC system that is protected with dc circuit breakers (CBs) is simulated on a real time digital simulator (RTDS) using detailed swi…

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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.…”

confidence: 99%

“…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.…”

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.…”

confidence: 99%

“…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.…”

confidence: 99%