Abstract
The probability of a single pole-to-ground fault in high voltage direct current (HVDC) transmission lines is relatively high. For the modular multilevel converter HVDC (MMC-HVDC) systems, when a single pole-to-ground fault occurs, the fault current is small, and it is difficult to identify the fault quickly. Through a detailed analysis of the characteristics of the single pole-to-ground fault of the MMC-HVDC transmission line, it is found that the single pole-to-ground fault has obvious capacitance-related characteristics, and the transient process after the single pole-to-ground fault is the discharge process of the distributed capacitance of the line. However, other faults do not have such obvious capacitance-related characteristics. Based on such feature, this paper proposes a novel capacitive fuzzy identification method to identify the single pole-to-ground fault. This algorithm can effectively identify both the fault of single pole-to-ground and the fault pole, which can contribute to the large database of the future smart grid.
Highlights
The past decade has witnessed a dramatic booming of renewable energy around the globe, while the large penetration of them into power grid has become a common phenomenon and is deemed as the future trend of smart grids by both developed and developing countries [1,2,3]
According to Equation (7), it is determined whether the MMC-high voltage direct current (HVDC) transmission line has a single pole-to-ground fault
If a single pole-to-ground fault occurs, the fault pole can be identified according to Equation (8)
Summary
The past decade has witnessed a dramatic booming of renewable energy around the globe, while the large penetration of them into power grid has become a common phenomenon and is deemed as the future trend of smart grids by both developed and developing countries [1,2,3] Their inherent property of high randomness and intermittency inevitably results in numerous problems [4,5]. Due to the above advantages, modular multilevel converter high voltage direct current (MMC-HVDC) systems are gaining popularity. With the demand of long-distance and large-capacity power transmission [26], MMC-HVDC systems using overhead lines gain more attention. The voltage of the fault pole becomes zero and the voltage of the other pole becomes two times the rated voltage This requires a higher level of insulation for DC transmission lines.
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