Magnetically controlled reactors (MCR), also known as magnetic valve controlled reactors, are a type of parallel reactor with adjustable capacity, mainly used for reactive power compensation in power systems. Due to the demand of the power system, controllable reactors have always been a research hotspot, among which the magnetic saturation controllable reactor proposed by former Soviet scientists using DC control has been promoted and applied. This type of reactor uses the excitation of the DC control current in the control circuit to change the magnetic saturation of the iron core, thereby achieving the goal of smoothly adjusting the reactive power output. It was developed on the basis of magnetic amplifiers. As early as 1916, the report on "magnetic amplifiers" was proposed by E.F.W. Alexander of the United States. In the 1940s, with the emergence of grain oriented silicon steel strips with high magnetic induction strength and low losses, as well as permalloy materials with high magnetic conductivity and high rectangular coefficient, the theory and application of saturated reactors were raised to a new level. In 1955, the world's first controllable reactor was successfully manufactured in the UK, with a rated capacity of 100MVA and a working voltage of 6.6-22. Since the 1970s, due to the rapid development of thyristor devices and the emergence of phase controlled reactors, controllable reactors have been relegated to the "cold palace". With the rapid development of the power industry, people's requirements for power supply quality and reliability are becoming increasingly high. This has led to a series of problems: the formation of ultra high voltage (UHV) large power grids and the intensification of load changes require a large number of quickly responsive adjustable reactive power sources to adjust voltage, maintain system reactive power flow balance, reduce losses, and improve power supply reliability. The high cost of phase controlled reactors (TCRs), which have been developed since the 1970s, has led to their widespread application in power systems being unreasonable. Given the above reasons, power experts have turned to seeking more economical and reliable adjustable reactive power compensation devices
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