Plug-and-play active adjustable reactor

Abstract

The invention belongs to the technical field of adjustable resistors, and discloses a plug-and-play active adjustable reactor. The plug-and-play active adjustable reactor comprises a voltage detectionunit, a voltage generation unit and a magnetic flux compensation unit, wherein the voltage detection unit comprises a voltage transformer, the voltage generation unit comprises a transformer, the magnetic flux compensation unit is provided with a slim mutual inductor, an original input end of the magnetic flux compensation unit is connected in series between a power grid and a load, an input endof the voltage detection unit is connected in parallel between two ends of the original input end of the magnetic flux compensation unit, an output end of the voltage detection unit is connected withan input end of a gain circuit of the voltage generation unit, the gain circuit, a PWM modulation module, a voltage source inverter and an LC passive power filter are sequentially connected, and finally, an output is connected with a secondary input end of the magnetic flux compensation unit. The mutual inductor of the magnetic flux compensation unit is also designed in target way. By the plug-and-play active adjustable reactor, the obtained active adjustable reactor has the advantages of wide adjustment range, rapid response speed, no harmonic generation and favorable continuous stepless adjustability and is easy to control.

Description

technical field [0001] The invention belongs to the technical field related to adjustable impedance, and more specifically relates to a plug-and-play active adjustable reactance. Background technique [0002] For the safe, stable and economical operation of the power system, the American Electric Power Research Institute (EPRI) proposed the concept of Flexible AC Transmission System (FACTS) in 1986. FACTS essentially integrates power electronics technology, microelectronics technology and control technology to optimize System operating parameters, improving system power flow distribution, suppressing harmonics, stabilizing voltage, improving system stability and transient performance. As a common flexible AC power transmission equipment, adjustable reactance can be used in power systems, for example: as phase modulation and voltage regulation equipment in ultra-high voltage power grids; in long-distance power transmission systems When a short-circuit accident occurs in the ...

AI Technical Summary

Problems solved by technology

The main types and advantages and disadvantages of adjustable reactance include: (a) turn-adjustable adjustable reactance

[0004] However, further studies have shown that the above-mentioned types of adjustable reactance still have the following defects or deficiencies: First, the transformer-type adjustable reactance is usually in series structure, and it must be disconnected from the grid for operation when connected to the grid. Learn from the power grid, and it is not easy to protect during normal operation; secondly, its impedance is still linear impedance, not only the adjustment range is limited, but to increase the adjustment range, the capacity of the coupling transformer and VSI needs to be increased accordingly, and the cost performance is very low

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