RU2400901C2 - Ac electric network - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: AC electric network is arranged on the basis of 2(1+n), where n - integer number, transformers, each having two linear three-phase windings, connected by their zero terminals in order of phases alternation to common points between six groups of ring from controlled semiconductor valves and through phase terminals of linear three-phase windings, disconnectors and wires of power transmission lines are connected serially, besides groups of controlled semiconductor valves in each circuit of two phases are connected back-to-back.

EFFECT: increased reliability and expansion of functional capabilities.

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Description

The invention relates to the field of electrical engineering, in particular to a device for converting and transmitting electricity over long and long distances.

A known alternating current electric network connecting in a three-wire system connected to a star of a winding of a generator and an electric energy receiver, see A.T. BASHKIN "General Electric Engineering", M., Energy, 1971, p.164, Fig.6-3.

At a frequency of 50 Hz, the electromagnetic wavelength is 6,000 km. Accordingly, the length of the known electric network equal to half a wave is 3000 km. When the length of the electric network differs from the half-wave, to give it the properties of a half-wave at the end point, reactive power devices are included that provide artificial tuning to a half-wave.

Closest to the invention is an alternating current electric network containing two m-phase circuits of a power line connected on the transmitting and receiving side to one terminal of the disconnector, transformers with windings having phase and neutral terminals on each of these sides, and switching devices connected to the zero terminals of the transformer windings, and the phase terminals of the transformer windings are connected to other terminals of the disconnectors, see ed. testimonial. USSR No. 1112483, class H02J 3/00, 1983.

The disadvantage of such an electrical AC network is the limited possibility of its practical application.

The objective of the invention is to remedy this drawback.

The problem is solved by applying 2 (I + n) in the electric network, where n is an integer, transformers with two linear three-phase windings, the zero terminals of which, in the order of phase rotation, are connected to rings of six groups of controlled semiconductor valves, and through phase conclusions of linear three-phase windings disconnectors and wires of power lines are connected in series.

Figure 1 shows a schematic diagram of an electrical AC network; figure 2 shows a timing diagram of the relative values of voltages and currents during transmission of electrical energy with a power factor equal to one; figure 3 shows a diagram of the linear part of the electric sem AC; figure 4 presents a diagram of the linear part of the electrical AC network in the form of series-connected six power lines.

In the diagram of Fig. 1, the following designations are adopted: transformer 1 with linear three-phase windings 2 ÷ 5, transformer 6 with linear three-phase windings 7 and 8, transformer 9 with linear three-phase windings 10 and 11, disconnectors 12, wires 13 of power lines, rings in series connected groups of controlled semiconductor gates 14 ÷ 19 and 20 ÷ 25.

In the circuit of figure 1, the zero outputs of the linear three-phase windings 2, 5 and 3, 4 are connected respectively between the groups of controlled semiconductor valves 14 ÷ 19, and the zero conclusions of the linear three-phase windings 7 ÷ 8 and 10 ÷ 11 are connected respectively between the groups of controlled semiconductor valves 20 ÷ 25, the phase outputs of the linear three-phase windings 2 and 7; 3 and 8; 4 and 10; 5 and 11 are connected through disconnectors 12 and wires 13 of power lines.

When the transformer 1 is energized, the electric network operates in the mode of transmitting electric energy to the consumer through transformers 6 and 9. When the groups of semiconductor valves 14 ÷ 19 are completely closed, the electric network is disconnected. Then disconnectors 12 can be disconnected wires of power lines.

In a particular case, with a wire length of 13 to 1,500 km, the AC mains can operate in half-wave mode. In accordance with a time chart of the relative values of the currents of FIG. 2 for an angle of 60 electrical degrees, FIG. 3 shows the reality of such a regime.

In this case, the current flows through two circuits: phase B of the windings 2, 7, a group of valves 21; phase A of windings 7, 2, valves 18, 17; phase B of the windings 5, 11, valves 24; phase A of windings 11, 5, valves 15, 14 and phase B of windings 4, 10, valves 21; phase A of the windings 10, 4; valves 15, 14; phase B of windings 3, 8, valves 24; phase A of windings 8, 3, valves 18, 17; phase B of the windings 4, 10, valves 21, i.e. current at each moment of time flows in chains of 6000 km.

In addition, figure 3 illustrates the operation of the electrical alternating current network, made in the ring version.

Figure 4 shows the linear part of the AC electric network for six power lines connected in a ring circuit, which shows the instantaneous distribution of current along the contours for an angle of 60 electrical degrees.

Thus, the AC electric network allows you to significantly expand the ability to transfer electric energy over long and ultra-long distances.

Claims (1)

An alternating current electric network containing transformers, each with two linear three-phase windings connected by zero terminals in phase rotation to common points between six groups of rings of controlled semiconductor valves, disconnectors and wires of power lines, characterized in that 2 (1 + n), where n is an integer of the mentioned transformers, which are connected in series through the phase outputs of the linear three-phase windings, disconnectors and wires of the power lines, and the groups controllable semiconductor valves in each circuit of two phases are included in the opposite direction.

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