SU828310A1 - Device for distributing active or reactive load between synchronous generators and industrial network - Google Patents

Description

cycles of the selective relay, and a stabilized constant-current source is used as a sensor of the active (reactive) current standard.

A disadvantage of the known device is the presence of a standard sensor of the active current of an industrial network based on a stabilized constant voltage source, which records the power delivered by each generator to the load at a predetermined level.

In this case, an increase in the load may cause an overload of the transformer substation, through which the industrial network is connected in parallel to the generators, while the generators will remain underloaded. In addition, the presence of a zener diode at the output of the active current sensor in each beam of a multi-path star does not allow the load to be evenly distributed by the workers in parallel with the generators when the network is disconnected if the load on the generator is less than the load on the slave units. The absence of large-scale converters at the outputs of the generators' active current sensors does not allow drying, to realize the principle of proportional load distribution between parallel-working ones, with generators of various nominal sizes.

These disadvantages limit the functionality of the device and reduce the reliability of the power supply system.

The aim of the invention is to expand the functional capabilities of the device and increase reliability.

The goal has been achieved in a device for distributing an active or reactive load between synchronous generators and an industrial network, which contains a load distribution scheme in the form of a multipath star consisting of rays, each of which contains a generator sensor for active or reactive current, power amplifiers and contacts of selectable relays, and a beam with a sensor of reference load and contacts of selective relays, a sensor of respectively active or reactive current is used as a sensor of reference load and an industrial network, and the device is equipped with large-scale converters, each of which is connected to the output of the corresponding sensor of a multipath star, and the output through the contacts of the selective relay is connected to the input of the corresponding power amplifier.

The drawing shows the functional electrical circuit of the device in which the devices for the distribution of both active and reactive loads are presented.

In this case, it is intended for generators 1 and 2 operating in parallel with the network represented by transformer substation 3. Each beam of the active load distribution circuit connected to the generator consists of a current transformer 4, an active current sensor 5, a large-scale converter 6 and an amplifier 7 power, and the beam connected to the network consists of a current transformer 8, an active current sensor 9, a large-scale converter 10. Each beam of a reactive load distribution circuit connected to a generator consists of current mater 11, reactive current sensor 12, large-scale converter 13, power amplifier 14, and the beam connected to the network consists of a current transformer 15, reactive current sensor 16, and a large-scale converter 17. Output 18 of large-scale converters 6 and 10 is short-circuited to the common bus 19. Output 20 of scale converters 6 and 10 can be connected to the bus 21 of the reference signal, respectively, by contacts of selective relays 22, 23, 24. Output 25 of scale converters 13 and 17 is short-circuited to common bus 26, and output 27 of scale converters ovateley 13, 17 may be connected to the bus 28, a reference signal polling relay contacts 22, 23, 24.

The device works as follows.

If generators 1 and 2 are connected in parallel with transformer substation 3, then it is relative active and reactive.

The loads of the transformer substation 3 are reference for generators 1 and 2. This is achieved by connecting the outputs 20, 27 of the converters 10, 17 contacts of the selective relay 24 to the buses

21, 28 reference signals. With equal, respectively, the relative active and reactive loads of the generators 1 and 2 and the transformer substation 3 differential signals at the inputs of amplifiers 7, 14

are zero.

Any change in the total active load or line voltage causes the appearance of differential signals at the inputs of amplifiers 7, 14, due to the non-identical characteristics of generators 1, 2 and transformer substation 3. In this case, amplifiers 7 will affect the drives of generators 2, and amplifiers 14-on excitation circuits of generators 1 and 2, taking into account the signs and magnitudes of the difference signals, until the relative active and reactive loads of the generators 1, 2 and the transformer substation 3 are fully balanced, respectively.

When parallel operation of generators 1, 2 without a network, one of the generators 1, 2, for example 1, becomes the master, and the outputs 20,27 of the converters 6, 13 of the generator 1 are connected by contacts of the selective relay 22 to the buses 21, 28 of the reference signals. At the same time, a generator of control and frequency is turned on in generator 1, providing it with static characteristics in frequency and voltage. When a difference occurs in the load of the generators 1 and 2, the difference signals are generated at the inputs of the amplifiers 7, 14 of the generator 2, the effect of which on the drive and the excitation circuits of the generator 2 will ensure load balancing. The proposed device provides parallel operation with an industrial network of a random number of units of various nominal capacities.

Connecting to the industrial network of sensors of active and reactive currents and the introduction of large-scale transducers allow the active and reactive load to be distributed in proportion to the nominal power of the generators and the transformer substation, which generally expands the device's feasibility and increases the power supply system reliability.

Formula and 3 optics

A device for distributing active or reactive load between synchronous generators and an industrial network, containing a load distribution scheme in the form of a multi-beam star consisting of beams, each of which contains a generator's active or reactive current sensor, power amplifiers and contacts of selective relays, and a beam with a sensor the reference load and the contacts of the selective relays, characterized in that, in order to increase its reliability and enhance the functionality, as a reference load sensor and A sensor of respectively active or reactive current of the industrial network is used, and the device is equipped with large-scale converters, each of which is connected to the output of the corresponding sensor of a multi-path star, and the output through the contacts of the selective relays is connected to the input of the corresponding power amplifier.

Sources of information taken into account during the examination 1. USSR Author's Certificate No. 583528, cl. H 02J 3/46, 1973.

2..-USSR author's certificate number 120569, cl. H 02J 3/46, 1959.

3. USSR author's certificate No. 243689, cl. H 02J 3/46, 1967.

Claims (1)

Claim A device for distributing an active or reactive load between synchronous generators and an industrial network, containing a load distribution scheme in the form of a multipath star consisting of beams, each of which contains a generator of active or reactive current of the generator, power amplifiers and contacts of selective relays, and a beam with a sensor reference load and selective relay contacts, characterized in that, in order to increase its reliability and expand the functionality, as a reference load sensor Use This Criterion sensor respectively active or reactive current industrial network, and the device is provided with a scale converters, each of which is the output of the respective sensor multipath star, and output via relay contacts polling included in respective power amplifier.