SU520664A1 - Reactive power source - Google Patents

Description

one

The invention relates to a technique for converting electrical energy using semiconductor elements, and can be used to improve power factor in power supply systems. To increase voltage quality in networks of proliferating enterprises, to stabilize the voltage in aatonical power supply systems and Ef.

There are known fast-food sources of reactive MDuiHOcxH (IRM) containing a thyristor bridge, which are included in the winding of the reactor Q}.

However, in such sources, the current form of the IRM is different from the sinusoidal one, since the thyristors are key elements,

It is perverse that in order to improve the shape of the current of the IRM. Before comparing, for example, the current shape of the one-side compensator .2, it is possible to increase the number of phases of its circuit and apply a multiphase sys- tem, such as load cases of a co-gun, turn on the output of the twelve-phase system.

Phase shift is supported by applying different circuits of the co-terminals of the secondary windings of the power transformer (D and L.).

The keystone of a multiphase IRM is that the typical power of the transformer in it exceeds the total power of the source.

The aim of the invention is to improve the shape of the resulting current, reducing the size, weight and cost of the IWW with a twelve-pulse scheme of the current of 1-m current.

This goal is achieved due to the fact that a magnetic shunt is installed between the rods with the reactor windings.

To obtain twelve pulse rectified current, the thyristors of each of the bridges are controlled asymmetrically.

FIG. 1 is a diagram of the device; in fig. 2 charts; stress on individual elements of the scheme; in fig. 3 - results of the IRM.

The IWM has two three-phase controlled high-voltage bridges 1,2, which are connected to the windings of the common reactor 3 from the side of the forward current, and directly to the network from the side of the alternating voltage.

Bridge bridges are controlled in such a way that the reactor winding is turned on alternately for long (90 e. Degrees) and short (30 e. Degrees) sections of line voltage of the network. Voltages on reactor windings

1 2 shifted among themselves at an angle of 60 el.grad. by the frequency of the network, and by their own first harmonics they are in the prota-phase.

The IRM reactor has two magnetically connected windings placed on the extreme rods of the magnetic circuit. The middle rod has gaps. it is the constant component of the flux from the magnetizing forces of both windings. Due to the connection between the reactor windings with respect to the variable component of the magnetic flux, the instantaneous currents in the reactor windings are equal to each other and have twelve-phase pulsations in each reactor.

Controlled thyristor bridges may, depending on the IRM mode, operate in both natural and artificial switching. FIG. 2 shows the voltage and current diagrams of the IWM for the mode with artificial switching (capacitive mode), Tde U.ts, U.tsg, O, d-linear

network voltage; C. p is the voltage across the reactor windings, i is the resulting current of the IWM.

The voltages on the reactor windings are shown without taking into account switching processes, which depend on the artificial switching circuit, but do not have a fundamental effect on the processes under consideration.

Claims (1)

1. Journal of Electricity, 1937, No. 4, p. 16. Fig.Z