A Multifunctional Fault Current Active Regulation Current Limiting System

Abstract

The embodiment of the invention provides a multifunctional fault current active regulation current-limiting system. One end of a first filtering module is connected with one phase of a to-be-controlled power grid by a first inductor; one end of a first dynamic voltage compensation module is connected with a first end of a first current-limiting module; the other end of the first dynamic voltage compensation module is connected with a second end of the first current-limiting module; both ends of a voltage stabilization capacitor are respectively connected with a third end of the first current-limiting module and a second end of the first current-limiting module; an energy storage module is respectively connected with both ends of the voltage stabilization capacitor; if the to-be-controlledpower grid normally operates, the first current-limiting module is turned off, and dynamic voltage compensation is carried out on the to-be-controlled power grid by the first dynamic voltage compensation module. According to the invention, a short-circuit current under a fault that a short circuit occurs to a single feeder or short circuits simultaneously occur to both feeders can be effectively inhibited; voltage rising, falling and three-phase voltage unbalance dynamic compensation on double feeders are implemented, the voltage compensation depth is improved, and a fault overcurrent is inhibited.

Description

technical field [0001] The embodiments of the present invention relate to the field of electric power technology, and in particular to a multi-functional fault current active regulation and current limiting system. Background technique [0002] With the development of the national economy, the rapid growth of the load of my country's power system has led to the continuous increase of the short-circuit power and short-circuit current of the power grid, which is very harmful to the safe and stable operation of the power system; nonlinear devices and impacts widely used in industry Loads are likely to cause grid current and voltage waveform distortion, and the sensitive load on the user side of the distribution network is gradually increasing, and people's requirements for power quality are becoming more stringent. Therefore, limiting short-circuit current, improving the safety and reliability of power system operation, and providing high-quality electric energy to loads have be...

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Problems solved by technology

However, the busbar series reactance can only realize the fault current limiting function. The reactor is connected in series in the grid for a long time, which wastes the power of the grid, and the parameters of the series reactor should not be too large, resulting in insufficient current limiting effect; while other bridge current limiter devices are complex The utilization rate is low, the cost is high, and the general current limiting technical solution cannot improve the power quality

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