SU83602A1 - An apparatus for obtaining a current of stable frequency from a variable speed generator - Google Patents

Description

The proposed device for obtaining a current of stable frequency from a variable speed generator is based on the principle of modulating the voltage of a powerful generator, rotated by a variable speed motor, by the voltage of another generator having a stable frequency much lower than the first one. The modular voltage is rectified and filtered.

In installations based on the same principle, current generation and modulation are carried out by different devices.

The advantage of the device described is the use of a single electric mask as a generator of a modulator, for which it is excited at the same time by a direct current and a current of stable frequency, which is a distinctive feature of this device.

FIG. 1 is a schematic diagram of the device; in fig. 2 - option with excitement from the exciter.

The generator-modulator of the GM is designed as a normal synchronous generator, but its excitation winding is powered not by direct current, but by the current that generates the flux F2o 1 + sin (). When the rotor of the generator-modulator GM is rotated at a rate of coi, the voltage Ui changes according to the law 6i (7io l + sin (). This voltage is applied to rectifier B and rectified voltage (/ 2 applied to primary transformer-filter winding T. On the secondary winding of the transformer T there will not be a constant component of the rectified voltage and there are practically no high harmonic frequencies / corresponding to the angular velocity oi, since the primary winding of the transformer, bridged by capacity, serves as a filter.

Thus, the voltage of sin () No. 83602 2 is removed from the secondary winding of the transformer to the network.

The power consumed from the current source with a stable angular velocity co is active, is small. People1 more angular ratio

speeds - the less the relative value of active power

current source to the angular velocity Ш2.

Along with a small active power from an electrical energy source with an angular velocity of? 2, considerable reactive power may be required. To discharge the source from this power, static capacitors can be installed.

To reduce the power of a stable frequency current source, a circuit with excitation from an exciter can be applied (Fig. 2). The causative agent of VG is made according to such a scheme as the main generator of the GM. At the same time, it is easy to obtain the necessary changes in the excitation current of the main generator-modulator or its flow Fo 1-l-sin (co2t + 92).

In this case, the source of electrical energy of stable frequency can be very low power.

The subject invention

B An apparatus for obtaining a current of stable frequency from a variable speed generator but by modulating the load current with a voltage of a stable frequency lower than the frequency of the generator current, followed by detection and filtering, in order to simplify the installation by using one machine at a time As a generator and modulator, a machine is applied that is excited simultaneously by a constant current and a current of stable frequency.

2. The use of the device according to claim 1 as a source of stable frequency current for driving a powerful variable speed generator.