Unified power flow controller (UPFC)-based overload control method of power transmission line

Abstract

The invention discloses a unified power flow controller (UPFC)-based overload control method of a power transmission line. The UPFC-based overload control method comprises the steps of firstly, determining a bus set which is monitored and protected by calculating sensitivity of current amplitude of each power transmission line in a power grid on change of an active power flow set value of a UPFC; and secondly, monitoring the current amplitude of the power transmission line in the set during the running process of the power grid, wherein the active power flow set value of the UPFC can be automatically adjusted by a control strategy so that a load of the power transmission line is controlled to be within a safe and stable running range when overload of the power transmission line is monitored. By the circuit overload control strategy, the problem of overload of the power transmission line brought by a fault or load / power generation fluctuation can be automatically solved, the safe running of the power transmission line is ensured, and the overload control method is very necessary for improvement of the running flexibility of a system and the safety of a power system and has important significance to engineering application of the UPFC and safe and stable running of the power grid.

Description

technical field [0001] The invention belongs to the technical field of flexible power transmission and distribution of power systems, and in particular relates to a UPFC-based transmission line overload control method. Background technique [0002] With the development of the power grid and the increasing load, the operating margin of the existing transmission lines is gradually reduced. Line overload at key transmission sections is becoming one of the key factors limiting inter-regional transmission capacity. In modern power systems, especially in densely populated urban power grids, the investment cost of new transmission lines is high and the feasibility is low. At the same time, the decommissioning of existing transmission lines (N-1 faults) and fluctuations in load / generation may cause large-scale shifts in power flows, resulting in overloading of transmission lines. The safe and stable operation of the power system has been greatly challenged. Therefore, the overload...

AI Technical Summary

Problems solved by technology

Line overload on key transmission sections is becoming one of the key factors limiting inter-regional transmission capacity. In modern power systems, especially in densely populated urban power grids, the investment cost of new transmission lines is relatively high and the feasibility is low.

At the same time, the decommissioning of existing transmission lines (N-1 failure) and fluctuations in load / generation capacity may cause large-scale shifts in power flows, resulting in overloading of transmission lines

The safe and stable operation of the power system has been greatly challenged

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