SU983893A1 - Device for precise automatic sunchronization of synchronous generators - Google Patents

Description

X54) DEVICE FOR ACCURATE AUTOMATIC SYNCHRONIZATION OF SYNCHRONOUS GENERATORS

t -. The device relates to the automatic synchronization of synchronous generators and to their inclusion for parallel operation and is intended for use in electric power systems and installations, in particular, in ships. A device for accurate automatic synchronization of synchronous generators is known, consisting of blocks for controlling frequency difference, controlling phase difference and monitoring voltage C13. The device is difficult to perform, since it requires a large number of elements to build the above blocks. The closest to the invention to the technical essence is a device containing a voltage difference block, a phase difference block and a frequency difference block, which are combined in one block in the form of a parametric amplifier and a parametric G2 frequency divider}. The device is characterized by relative circuit complexity. The core of the invention is to simplify the circuit. The goal is achieved by the fact that in the device for accurate automatic synchronization of synchronous generators, which contains a voltage difference block, a phase difference block and a frequency difference block, these blocks are made in the form of a parametric generator with two pairs of input windings, and the windings, modulation are included and are connected to the buses of synchronized generators directly, and the bias windings are switched in opposite and connected to the buses of synchronized generators via rectifying bridges. The drawing shows a diagram of the proposed device. The device contains a capacitor 1 of the oscillating circuit of a parametric generator, windings 2, forming a variable loop inductance, placed on a ferromagnetic core 3, on which modulation windings 4 and 5 are placed, bias windings 6 and 7. In addition, the device contains rectifying bridges 8 and 9.; The drawing also shows the basic generator 10, the connected generator 11, the automatic machine 12 ..

The oscillatory circuit of a parametric generator (PG) is formed by a capacitor 1 and a modulated inductance composed of two windings 2, the windings 2 are located on the extreme rods of a three-shaped ferromagnetic core 3, on the middle rod of which there are two windings 4 and 5 of modulation and two windings 6 and 7 offset.

The windings 4 and b are connected to the tires of the basic generator 10, the windings 5 and 7 are connected to the tires of the connected generator 11. The windings of the 4 and 5 modulations are turned on according to, the windings b and 7 are biased towards each other and are being pulled through straightening bridges 8 and 9..

The device works as follows.

IF there is no at least one of the synchronization conditions - the coincidence of the modules, phases and frequencies of the synchronized voltages, the circuit is not excited, there is no output signal.

When the phases of synchronized voltages coincide, the magnetizing forces of the modulation windings 4 and 5 coincide. The modulation depth of the inductance of the counter of a parametric generator becomes sufficient to excite it. But the circuit will be excited only if other synchronization conditions are present. If, for example, the frequencies do not coincide, the inductance modulation takes the form of beats with a frequency equal to the sum of the frequencies of the voltages being synchronized. If the frequency difference exceeds the allowable, the modulation frequency is outside the bandwidth of the loop. The output signal is zero.

When the phases and frequencies coincide, the contour is not excited if the condition of equality of the modules is not fulfilled. In this case, the difference between the magnetizing forces of the windings b and 7 of displacement differs from zero, the core is magnetized by a constant field. This will significantly reduce the modulation depth of the inductance, making it below the excitation threshold. .

When all the conditions of synchronization are satisfied, the constant displacement field is absent, the oscillation frequency is within the contour bandwidth, and the modulation windings 4 and 5 will, according to, provide a modulation depth sufficient to excite the contour. The contour of the cart: wakes up, as a result of which a signal is generated which can be used to activate the switching-on automaton 12.

The use of a parametric generator as a combined control unit for voltage difference, frequency difference and phase difference instead of a parametric amplifier and divider charts twice distinguishes the proposed device, as it allows to simplify the circuit, reduce its dimensions and weight, cost, and increase output power.

Claims (2)

1. Konstantinov V.N. Systems and devices of automation of electric power installations. L., Shipbuilding, 1972., p. 172. 2. USSR author's certificate number 467433, cl. H 02 J 3/42, 1972.