SU574818A1 - Device for pooling power systems - Google Patents

Description

one

The invention relates to the field of electrical engineering, in particular, to methods and devices for improving the stability and reliability of the combined energy systems, by combining the systems with flexible connections that allow them to work in parallel at different frequencies.

Devices for combining energy systems with different frequencies for parallel operation are known. In particular, a device for integrating power systems using an asynchronous dual power machine 1 is known. The only disadvantage of this device is the difficulty of current collection at high power settings.

A device for combining power systems is known, comprising a motor-generator set connected by a common shaft.

This device is closest to the invention by its technical nature. The drawback of the device is the difficulty of creating asynchronized machines (with multi-axis excitation, high power) 2.

The aim of the invention is to simplify and reduce the cost of installation by eliminating the use of asynchronized synchronous machines using conventional synchronous machines with uniaxial automatically controlled excitation.

This goal is achieved due to the fact that the machines are made synchronous with a single-segmented, automatically controlled excitation, the windings of the core form them

The two parallel branches, the iric windings of the like branches of both machines, are connected in series to one another and connected to one of the interconnecting power systems, the windings of the other parallel branch of both machines are connected in series to each other and connected to the terminals of the other of the interconnected power systems. At the same time, the electric machine shafts are interconnected so that the angle of the axles of the same name is 90 el. hail.

FIG. 1 is a schematic diagram of the device, where 1, 2 are the windings of the electric machine core connected to the first power system; 3, 4 - windings connected to the second power grid; 5, 6 — rotors with excitation windings, respectively, of the first and second machines; 7 - automatically adjustable excisers :, L / i, Lz - accumulations of the united power systems; Il, / 2 -

currents B adjacent lines x.

FIG. Figure 2 shows a vector diagram of the voltages of the connected power systems in d and q coordinates, formed by longitudinal axes located at an angle

Claims (2)

90 °. In this case, q is the coordinate coinciding with the longitudinal axis of the rotor of the first machine, and d is the coordinate coinciding with the longitudinal axis of the rotor of the second machine. The operation of the devices is explained by the Gorev-Park equations for component currents and voltages, in coordinates d and, the final solution of which is the expression for active powers (received from the side of one of the power systems and output to the other). The Gorev-Park equations for non-pole-mounted machines with the same parameters can be written as follows: f / ,,: 2, + E, + B ,; Ufiz 2JC + E ;, -id ,; , a (-d. + id) + Xais ,; Id, a (i, - dJ; -Lfa, 2xJ ,, + Ei + Ei. -U ,, 2x, i,., +. K / y, (. + “.); H, (where Xs is the resistance scattered by each of the parallel branches of the windings of the machine; xa is the reaction resistance of the core; U ,, Uii, L / a ,, LJd, are components of the voltages V and t / 2; ii Chg 2 are the components of the currents k and / 2, respectively, flowing from one system and flowing into another; s /, c, i, are the EMF components in the gap 9z rf. of the first and second synchronous machine; t /, / d are the currentIs of the rotors of the first and second machines, respectively. relative to the component currents and voltages, you can get expressions for active of PI and PZ, respectively, flowing from one system and flowing into another. L. ..- .. + ..- / .. 2G / G. X (+ X (A + d.-f. X P., Uq , -iq ,, - td, 2 (X, + X,) X (Uc, .rh ..- Ua., - if, From the vector diagram (Fig. 2), under the condition that the stresses Ui are equal, U, U,., Ud - Ud, -, and sin -, - where 6 is the angle between the voltage vectors f /, and f / 2. This refers to the last relations that condition the independence of the amount of power flow by the power from the angle between the voltage vectors UiEUz for a given direction and the magnitude of the flow are uniquely: -f /, sin--; | - 2 f.n os where: is the amplitude value of the rotor current. In this case, the expressions for active powers are obtained in the form: p –p - g / - (., +.,) / - Thus, by automatically adjusting the excitation, the currents in the windings of the rotors of each of the machines are changed according to the corresponding (for example, above) By law, a given active power is achieved regardless of the angle between the vectors t / i and / 2, i.e., at different frequencies of the power systems to be combined. An apparatus for combining power systems with different frequencies for parallel operation, comprising two electric machines, the rotors of which are united by a common shaft, characterized in that, in order to simplify it, said electrical trains are synchronous with single-axis automatically controlled excitation, the windings of the cores form two parallel branches, the windings of the parallel branches of the same name of both masin are connected in series in accordance with and connected to one of the energy systems being combined m, the windings of the other parallel branch of both machines are connected in series-opposite and connected to another power system, with the axial rotor axes located at an angle of 90 ° to each other. Sources of information taken into account in the examination 1. Swiss patent number 429921, cl. 21d-, 5/01, 1958. 2. The patent of Germany L 1012371, cl. 21d2 42/04, 1967. , .- ,, Ifr.