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A protection scheme based on dual criterion of activeinjection and virtual voltage for distribution network linewith T-connected distributed photovoltaic and load
  • Junqi Qiu,
  • Ruifeng Zhao,
  • Bin Li
Junqi Qiu
Guangdong Power Grid Corp
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Ruifeng Zhao
Guangdong Power Grid Corp Power Dispatching Control Center

Corresponding Author:[email protected]

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Bin Li
Guangdong Power Grid Corp
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Abstract

This paper firstly analyses the fault equivalent circuit of DG (Distributed Generation) as a high-frequency harmonic source, and then deduces the fault characteristics of the electrical quantities at both ends on the basis of high-frequency harmonic injection, pointing out the weaknesses: easily affected by the load capacity of the T-connected load. Afterwards, this paper draws the equivalent circuit diagram of the positive sequence component after the fault and derives the difference expression of the virtual electrical quantity at the opposite end under internal or external faults at different locations, and then analyses the fault characteristics of positive sequence under the industrial frequency. On this basis, this paper proposes a double-terminal protection scheme based on the combination of high-frequency harmonic injection and virtual positive sequence differential principle. Finally, the protection scheme is verified on the MATLAB/SIMULINK platform. And the proposed protection method can identify faults within 30ms, with a capability of enduring transient resistance up to 200 Ω, noise immunity reaching 200 dB, and being unaffected by the size of T-connected load capacity or the fault location.
12 Jul 2024Submitted to IET Generation, Transmission & Distribution
12 Jul 2024Submission Checks Completed
12 Jul 2024Assigned to Editor
12 Jul 2024Review(s) Completed, Editorial Evaluation Pending
12 Sep 2024Reviewer(s) Assigned
30 Sep 2024Editorial Decision: Revise Major