SU1206880A1 - Method of switching synchronous generator from power system with power excess to power system with power deficiency - Google Patents

Description

 The invention relates to electric power industry, namely the unification of power systems with different frequencies, and can be used for exchanging electric power between non-synchronous operating systems.

The goal of the invention is to increase the reliability and stability of power systems by preventing breaks and transferring electricity to the power system with a power shortage.

FIG. 1 shows the scheme

 electrical connections of the power plant for the implementation of the proposed. The method for switching a synchronous generator using an asynchronized electromechanical transducer part (AC EM1CH) in FIG. 2 - the stage of autonomous operation of the switching generator with the EMPCH AC, necessary for synchronizing the switched generator with another system and switching it without unloading.

The drawings are shown; first 1, second 2 and third 3 bus systems, bus connecting switch 4, switches 5-7 of the switching synchronous generator, switches EM11CH 8-10, synchronized machines 11 and 12 EMPCH, switchable SYNCHRONI generator 13, controlled converters 14 and 15 of the frequency of the AC EMP controller, the controller 16 and 17 of the excitation, the excitation regulator structure correction block 18, the switch position control unit 19, the EMP AC control panel 20. I.

If necessary, switch

generator from one of the non-synchronous working systems to another regardless of the initial mode of the EZh1CH AS, for example, generator 13c, system spr 1 to the bus system 2, it is necessary to carry out a certain sequence of operations in stages. Fig. 2), in which, using the properties of the controlled element of the EMPCH AC, the generator is synchronized with the system, to which it is subsequently connected. The operations are carried out in the following sequence.

Combine the system) tires 1 and 3 by turning on the bus connection

)

50

5 o

five

switch 4, turn on the machine 12 AC EMPCH and synchronous generator 13 on the bus 3, turning on the switches 5 and 8, turn off the switches 9 and 7 ..

After the first stage is completed, the generator electrically connected to the tires 3 and the ESCH machine 12 AS are connected to the bus system 1 only via the bus switch 4.

From the control panel 20 or automatically, according to the condition of equality of the power flow through the EMPCH AC and the current power of the switched generator, a signal is given to turn off the N1 switch of the nanoaddressing switch 4, thereby transferring the generator 13 to autonomous operation from AS №14 Equality of the indicated powers is necessary under the conditions of preserving the modes of the generators 13 and the ACs of the ESH1CH after disconnecting the switch 4 and reducing the current flowing through the switch 4 at the moment of its shutdown.

According to the lockout signal of the shutdown of the busbar switch 4, coming from the control unit 19 of the switch positions by the correction unit 18, the structure of the controller 17 is changed and the circuit goes into synchronization mode (Fig. 2). In this case, the regulation of the excitation voltage of the machines 11 and 12 of the APS EMPCH is carried out according to the laws:

(01

Su

mouth 2.

/ COG + CO,, l

w (-. n

Col iJ ,,

- 4iur-u,

u, u

/ SoC -,) S.T: h)

, (ig-and.),

where

i

and

w

Hl2

,

i

iji

W

tOB

components determined by the conditions of the previous steady state VV,, Vv, are transmission

uJi -t- H

functions on the speed of rotation of the AC EMPCH shaft, mutual frequency of systems 2 and 33, and for example

correspondingly

,, 0,0) 3- frequency bus systems 1-3;

and

acw

- installation at the voltage equal to the bus 2 of the system, the current values of the voltages of the machines 11 and 12 of the APS EMP,

W 8 - the speed of rotation of the shaft c "AC EMPS; Ly j - is chosen from

the conditions for ensuring the inclusion of a switchable generator according to the signal generated according to the principle implemented in the WUA facilities with waiting or catching synchronization.

As can be seen from the above laws, the action of the excitation regulator 16 is aimed at keeping the speed of rotation of the AC EMPCH shaft and maintaining a predetermined voltage level at the 2 points of the system. Under the action of the excitation controller 17 asynchronized, the machine 12 AC HFMS, and with it electrically connected with it switch 2068804

Depending on the difference in frequencies and overloads on buses 2 and 3, the generator 13 changes its power so that the generator 13 transfers to HOBbDi a steady state with voltage and frequency parameters different to Bus systems 2, to which it switches generator 13.

10 According to the voltage and frequency alignment signal} ia buses 2 and 3, using the well-known method of switching on the generator with waiting or catching synchronism, turn on switch 6, thus ending the process of transferring generator 13 from the bus system 1 to 2.

Transfer of the EMPCH AC from the control panel 20 to the mode of intersystem communication of buses 1 and 2, idling or switching the next generator from one of the non-synchronous operating to the other. Obviously, instead of an asynchronous electromechanical frequency converter, a static frequency converter can be used, such as a DC injection. In this case, the excitation controllers of the ACE EMPCH machines should be replaced with special control devices, a DC insert installed at the power plant with a power equal to the power of the largest synchronous generator, and all the devices necessary for its normal operation.

KeuemfMei

From damvu / fcrf frequency and voltage of tires 1,2,

From lo / south sensors

bb} x / 1yu ggps / 1 and

From the power patches of machines and, g2,13 FIG.

Editor R. Tsitsika

8728/55 Circulation 6 5 Subscription

BffliHIM USSR State Committee

on affairs of invention and discoveries 113035, Moscow, Zh-35, Raushsk nab. 4/5

Branch of TP Patent, Uzhgorod, Proektna St., 4

Fick. Z

Compiled by K.Fotin

Tehred M. Parotsay. Corrector A. 3go1okos

Claims (2)

1. METHOD FOR SWITCHING A SYNCHRONOUS GENERATOR FROM A POWER OVER SUPPLY SYSTEM TO A POWER DEFICIENCY POWER SYSTEM by using a controlled reversible frequency converter that connects two power systems, synchronizing a switched synchronous generator with a deficient power system, which is different when the conditions are fulfilled, which is different when changing conditions reliability and stability of energy systems by preventing interruptions in the transmission of electricity to a deficient energy system power, a switched, synchronous generator is driven to work through a frequency converter to a power system with a power shortage and synchronized by acting on the frequency converter. 2. The method of pop. ^ characterized in that before performing _the singing of synchronization, the power of the switched generator and the power of the frequency converter are measured and compared, according to the result of the comparison, the power of the frequency converter is changed and the switching is performed when the powers of the switched generator and frequency converter are equal