WO2018087603A4

WO2018087603A4 - Method of continuous power supply

Info

Publication number: WO2018087603A4
Application number: PCT/IB2017/001682
Authority: WO
Inventors: Oleksandr MUZYCHENKO; Yuri MUZYCHENKO; Oksana MUZYCHENKO
Original assignee: Muzychenko Oleksandr
Priority date: 2016-10-28
Filing date: 2017-12-28
Publication date: 2018-08-23
Also published as: WO2018087603A3; WO2018087603A2

Abstract

The method claimed applies to electric power engineering, namely to three-phase networks and installations. The method is used in single-circuit and double-circuit networks with voltage from 110 V to 330 kV. The method ensures continuous three-phase power supply in case of network breakdowns. The method is based on magnetic flux retention by additional current circuits formed by the power line wires and the phase stabilizer, which ensures magnetic energy conservation in multiphase circuits, as well as on change of currents paths in case of phase conductors breakage In a three-phase network, or / and in case of phase-to-earth and phase-to-phase short circuits or / and three-phase short circuit The proposed method makes it possible to avoid stoppages in operation of enterprises, to postpone repair of failure consequences, as well as delimits the damaged section of the power transmission line. In transients, the method helps to reduce or eliminate the free transient component, which leads to voltage surges and over-current, as well as to high-voltage harmonic components. The method addresses the Impact of geomagnetic storms and- allows measures to be taken if there is a threat of energy attack, in particular electromagnetic pulses (EMP).

Claims

1 AMENDED CLAIMS received by the International Bureau on 05 July 2018

1 . A method of continuous power supply for a critical load (21 ) in case of emergencies in a multiphase (in particular three-phase) network or installation, at least the first (main) path transmits electrical energy in each phase along (zd) each wire (phase A1 , B1 , C1 , 01 ) of the network or installation, is characterized by the fact that in each wire (phases A1 , B1 , C1 , 01 ) of the network or installation, the electrical energy is transmitted by two or more routes on one or more lines of the network or installation, at least the second (standby) path transmits electrical energy to the damaged phase (B1 ) in the transverse direction (non), i.e. between the wires (A2, B2, C2, 02) of one or multiple lines of the network or the installations at the end of a single- or double-circuit network, the standby path is created by introduction of inter-phase connection in at least one point of the same network or installation, this inter-phase connection can be designed as electromagnetic connection (19 ) and / or electric connection (such as inductive- capacitive (1 13 and/or 1 14) connection), potentials of the critical load terminals (21 ) are approximately equalized in each phase (A2, B2, C2, 02) of the network or installation line when the load is supplied both through the main (zd) and the standby (non) paths, if phases of the main path are affected by emergency (9), the damaged phases (B1 ) are replaced parametrically by wires (phases) of the standby (non) route; damaged (B1 ) and intact (B and B2) wires of the network line are disconnected, each three-pole circuit breaker of the network line is replaced by three unipolar switches (3-5, 13-15, at the moment of the disappearance of current conductivity in the line phase wire (B1 ) zero phase sequence current Filter (ZPSCF) introduces currents of zero sequence and creates incomplete phase mode in the network line (A1 , C1 , 01 ), and simultaneously output currents of zero sequences and create a full-phase mode at the end of the output (A2, B2, C2, 02) of the network line connected to the critical receiver 21 .

2. A method according to claim 1 , which is characterized by the fact that the transverse transmission (non) of the electrical energy between the wires (phases A, B, C, 0) of the network or the installation is performed by the incomplete phase connection of the zero phase sequence current filter (ZPSCF) to the network line (A1 , C1 , 01 ) and full-scale connection of the ZPSCF (19) to the end of the line's output (A2, B2, C2, 02).

3. A method according to claim 2, which is characterized by the fact that the "ZPSCF" (19) is based on a three-leg core, each leg comprising at least two windings; the coupling coefficient between windings of each leg is increased from 0.95 to 0.9999 through mutual compensation of stray magnetic fields which is achieved, for example, by bringing wires of opposite phases closer together and/or by surrounding a wire of one phase with one or several wires of another phase, 2

windings of the "ZPSCF" are interconnected as selected from the following range: zigzag, lambda, Scott connection, A-shaped connection, connection of a single-phase transformer and a single-phase autotransformer, half-pole connection, six-pointed star, high-leg connection; while phase and neutral terminals of the "ZPSCF" (19) are connected one by one to phase and neutral terminals (A2, B2, C2, 02) of one or several lines of the network or the installation, by introduction of electric and electromagnetic inter-phase connections, the network line is converted into an effectively (rigidly) connected phase-neutral system".

4. A method according to claim 3, which is characterized by the fact that the "ZPSCF"(19) is combined with another electromagnetic component from the following range: synchronous or asynchronous AC machines, a transformer with windings connected as delta-wye with a neutral wire or/and wye— half-pole with a neutral wire, an autotransformer with intermediate winding terminals, shunt throttle, an amplitude-phase converter with capacitive (1 13) and/or inductive (1 14) reactance's and/or with semiconductor elements (1 15)".

5. A method according to claim 4, which is characterized by the fact that, in the network (A, B, C, 0), sensitivity of the neutral wire (01 ) potential to current in the neutral wire (duo/dio) is reduced by a factor of 3 to 15, and/or sensitivity of each phase wire (A1 or B1 or C1 ) potential to current in the phase wire (dup/dip) is reduced by a factor of 1 .5 to 3.0; in this case, sensitivity of the phases is reduced either by increasing the installed power of components in the network or installation line (for example, by increasing cross- section of the wire) and/or by connecting a "ZPSCF" (19) with an increased ratio of mutual compensation of stray magnetic fields".

6. A method according to claim 5, which is characterized by the fact that starting currents of the "ZPSCF" (19) are reduced when it is connected to a three-phase network (A2, B2, C2, 02)".

7. A method according to claim 6, which is characterized by the fact that short circuits are cleared by super-fast switches selected from the following range: a fuse (6), a deliberately blown fuse (16), a contactor (36), a circuit breaker (4), a semiconductor switch (30) (for example, a thyristor (33)).

8. A method according to claim 6, which is characterized by the fact that in the single-circuit or dual-circuit networks, as well as in the ring or loop networks (FIG. 7 or FIG. 8) and in installations, for example, multiphase filters, continuity of electrical supply at breakage one (A1 ) or several (A6 and B6, A6 and 06) wires of linear or zero phases reach the charge or discharge of the capacitor battery when the amplitude, frequency, and phase voltage of the phase is restored at the points of the standby route (non, A2, B2, C2, 02 and 19), while the backup route is created by entering one point in a single network or interconnect, which is performed in a semiconductor (1 15) performance.

9. A method according to claim 6, which is characterized by the fact that, in case of phase or phase-to-phase short circuits, continuous power supply is provided by stabilizing voltage of the critical load (21 ) by the means of single-phase semiconductor voltage regulators connected between the "ZPSCF" (19) and the critical load (21 ).

10. A method according to claim 6, which is characterized by the fact that, in case of phase loss in double-circuit networks, ring or loop networks with oppositely directed 3

voltage vectors in similar phases of two lines, continuous power supply is ensured by connection of a six-phase "ZPSCF".

1 1 . A method according to claim 6, which is characterized by the fact that, at the moment of emergency failure, transverse transfer (trans) of electrical energy between phases of the network or the installation is effected by the means of one (1 13) or two (121 and 124) capacitive banks or one (1 14) or two (122 and 123) inductance coils.

12. A method according to claim 6, which is characterized by the fact that, at the moment of emergency failure, transverse transfer of electrical energy between phases of the networks or the installation is effected by the means of at least half-wave or full-wave rectifiers of intact phases by feeding their energy to wires of damaged phases through a battery and an inverter.

13. A method according to claims 1 and 7, which is characterized by the fact that electrical energy is accumulated in at least one phase (A) by means of one capacitor bank (25); the accumulated electrical energy is discharged to the fuse insert (16) using a controlled thyristor or

transistor switch (28), and phase short circuit is cleared by blowing the fuse insert (16), thus changing from the phase short circuit mode to the same phase loss mode.

14. A method of claim 7, which is characterized by the fact that, in case of a phase- to-phase short circuit, input (33) and output (48) thyristor or transistor switches are opened in one phase of the network or installation line, and opening and closing times of these switches are synchronized by telemetry means.

15. A method according to claims 1 and 14, which is characterized by the fact that, in case of power transmission failure, the damaged area is limited (localized) to the boundaries (2 on one side and A2, B2, C2, 02 on the other side) of the network or installation line route by the means of direct parametric transformation of a three-phase system of critical load (21 ) voltages and currents into a two-phase system of network line voltages and currents (A5, B5, C5, 05), as well as by inverse parametric transformation of a two-phase system of network line voltages and currents into a three-phase system of voltages and currents in the transformer (2) for the power transmission section (1 ), which is located between the head of the network line (2) and the transmission power generating equipment (Ao, Bo, Co).

Applicant MUZYCHENKO Oleksandr