Abstract
Due to the complex sending terminal structure of offshore wind transmission systems, conventional on-line monitoring-based protection cannot work well. The electromagnetic transient faults are also difficult to locate due to a short time span with fast characteristics that are affected by various power electronic devices and control algorithms. To solve the aforementioned problems, a new offshore wind transmission line protection scheme based on active detection of submarine cable sheath current is proposed. This method uses a normalized coding cooperation to realize the risk levels and failure locations of the transient defects, and then the sheath currents become a characteristic input data source, which can build a clear system protection boundary. Case studies using MATLAB and ATP simulations are carried out, where three types of transient faults represented by sheath currents are studied, i.e., loss of electrical continuity of grounding device, short circuit of segmented metal sheath of cable joint, and water immersion of junction box. Testing results illustrated that the proposed method could achieve fast fault detection and precise fault location of the electromagnetic transients. Moreover, compared with conventional wind farm protection techniques, it only needs to add few signal injection modules with high sampling frequency into the submarine optical fibers.
Highlights
Offshore wind power is increasingly considered as one of the most promising choices for constructing power system with high penetration of renewable energy, due to its advantages of stabilized large-scale wind resources and high utilization hours (Lakshmanan et al, 2021)
This paper proposes a novel fault detection and location method–based active protection for a typical HVAC transmission system for offshore wind power plants, including optimization and realization of the protection scheme to judge the type and specific location of cable sheath defects
Aiming at the three-phase short-circuit symmetrical fault condition of the onshore AC grid, this paper studies the electromagnetic transients modeling method of the offshore wind power system through the HVAC cable data collection and transmission, laying a theoretical foundation for the system electromagnetic transients control and protection, and improving the fault ride-through of the offshore wind power ability (Huang et al, 2021)
Summary
Offshore wind power is increasingly considered as one of the most promising choices for constructing power system with high penetration of renewable energy, due to its advantages of stabilized large-scale wind resources and high utilization hours (Lakshmanan et al, 2021). Deep data mining is necessary for the collected sheath current datasheet to carry out active protections such as fault type identification and fault location Based on these problems, this paper proposes a novel fault detection and location method–based active protection for a typical HVAC transmission system for offshore wind power plants, including optimization and realization of the protection scheme to judge the type and specific location of cable sheath defects. This paper proposes a novel fault detection and location method–based active protection for a typical HVAC transmission system for offshore wind power plants, including optimization and realization of the protection scheme to judge the type and specific location of cable sheath defects The key of this active protection algorithm is to study the variation law of metal cable sheath current at the fixed point corresponding to the junction box. The practical application of this active protection scheme in offshore transmission system through sheath current data collection by broadband transient current measuring units along with data communication by optical fiber units is discussed
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