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Optimal operation and control method of fault flexible arc suppression and power quality control composite system

A power quality and composite system technology, applied in the direction of AC network voltage adjustment, electrical components, circuit devices, etc., can solve problems such as current impact, MF-GCI design complexity, etc., and achieve the effect of solving complex parameter design

Active Publication Date: 2022-05-06
HUNAN UNIV
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Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide an optimized operation and control method for a composite system of fault flexible arc suppression and power quality regulation, which solves the problems of complex design of MF-GCI and transient voltage and current impact during mode switching; and in different When the mode is switched, the active part and the passive part cooperate with each other

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  • Optimal operation and control method of fault flexible arc suppression and power quality control composite system
  • Optimal operation and control method of fault flexible arc suppression and power quality control composite system
  • Optimal operation and control method of fault flexible arc suppression and power quality control composite system

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Embodiment Construction

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0036] like figure 1 Shown is the circuit topology diagram of the fault flexible arc suppression and power quality control composite system according to the embodiment of the present invention, which adopts three single-phase structures, three phases are symmetrically distributed, and each phase can operate independently. The circuit topology includes a grid-connected converter (Multi-Function Gridconnected Inverter, MF-GCI), a transformer T, and the current i...

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Abstract

The invention discloses an optimal operation and control method for a composite system of fault flexible arc suppression and power quality control. The method includes, when the power grid is in normal operation, controlling the thyristor VT 1 and VT 2 The firing angle of α = 180°, so that the TCLC structure is capacitive, and the capacitive reactance and capacitance C of the TCLC structure are set 1 , the TCLC structure compensates all reactive power; when a single-phase ground fault occurs in the power grid, the thyristor VT is controlled 1 and VT 2 The firing angle of the TCLC structure is α=90°, so that the TCLC structure is inductive, and the reactance and inductance L of the TCLC structure are set 1 and inductance L 2 The inductance, TCLC structure injects the largest inductive arc suppression current. Effectively reduces the MF‑GCI DC side capacitor voltage and ensures the safe operation of the MF‑GCI.

Description

technical field [0001] The invention belongs to the technical field of arc suppression for distribution networks, and in particular relates to an optimal operation and control method for a composite system of fault flexible arc suppression and power quality control. Background technique [0002] The distribution network equipment is complex, with many users, wide coverage, varied geographical conditions, and is affected by external conditions such as user capacity increase and urban construction and other factors, and the probability of failure is relatively high. Most of the distribution network faults are single-phase ground faults. When a single-phase ground fault occurs in the distribution network, the non-fault phase-to-ground voltage rises, which can cause system overvoltage, lead to insulation breakdown, and easily expand to phase-to-phase short circuit. [0003] As a bridge connecting the transmission system and power users, the safe operation of the distribution net...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/12H02J3/18
CPCH02J3/12H02J3/1842H02J3/1864Y02E40/30
Inventor 郭祺涂春鸣黄泽钧肖凡姜飞肖泽坤卢柏桦高家元兰征
Owner HUNAN UNIV
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