SU1427466A1 - Parameter gain unit of self-adjusting model of power transmission line - Google Patents

Abstract

This invention relates to electrical engineering, in particular, to relay protection. The purpose of the invention is to expand the functionality. The device contains a model 1 of a long line, a model 4 of a small length on two multipliers 5 and 6, a differentiator 7, an adder P. The tuner is configured continuously for models 1 and 4. The device monitors any change that occurred in the operating mode of the protected line. Depending on the distance to the short circuit. The device flexibly rebuilds and protects the structure of the model (L

Description

The invention relates to electrical engineering and can be used in relay protection of power lines,

I The purpose of the invention is the extension - I functionality,; Fig, 1 shows a block diagram of the device; Fig 2 -:. scheme of one of the links of the long line model; in fig. 3 - strzp: turnn diagram of the link, which forms the output voltage and current of the long line model; . FIG. 4 is a block diagram of a long line model; in fig. 5 is a schematic diagram of a device incorporating an observable block; Fig. 6 shows the response characteristics of the device.

The block of parameters increments of the self-adjusting model of the line EL & Y: the transfer TT contains the self-adjusting model 1 of the long line, in turns; which are the inputs 2 and 3 of the block, the model 4 of a small length, made on two multipliers 5 and 6, the first input of one of which through the differentiator 7 is connected to the similar input of the other and connected to the input 8 of model 4, and the second inputs are the intermediate inputs of the model and are connected to the same inputs of blocks 9 and 10, and from the mapper 11, the output of which is the output of model 1, the subtractor 12, one of the inputs of which is connected to the output of model 4 of a small extension, sensitivity model 13 nevzki customizable It has long-parameter model hydrochloric lines and three terminals of the multiplier 14-16, first inputs of which soe- dineny yield subtractor 12 and the second inputs of the Auto - respectively a yield model 13 nev dressings, input and output of the differentiator 7 Current you

g

0 - 0:

five

stroke 17 of model 1 of the long line is connected to input 8 of the model, and voltage output 18 is connected to the free input of the subtractor 12, Model 13 does not include the output voltage and current model of the long line, the output voltage generation circuit 20 a short circuit and a subtractor 21, the output of which is the output of the model 13 is non-linear, and the input 22 of the output voltage shaping circuit 20 of the small extension model is connected to the output 23 of the current shaping circuit of the output voltage shaping circuit 19 the length of the line, the output 24 of the voltage shaping circuit, as well as the output of the sensitivity circuit 20 of the output voltage of the small extension model, is connected to one of the inputs of the subtractor 21,

Each of the links 25-27 of model 1 of the long line contains two subtractors 28 and 29, the first inputs of which are inputs 30 and 31, and the outputs - outputs 32 and 33 of the voltage and current of the link, and the output of one of them (subtractor 29) connected to the second input of the other (subtractor 28) sequentially connected by the differentiator 34, the output of which is simultaneously one of the intermediate outputs 35 of the link, the amplifier 36 and the multiplier 37, the free input of the subtractor 29 is connected via a different multiplier 38 to the common point of the second intermediate output 39 link and exit with mmatora 40 whose inputs are in: turn, connected to the first input of subtracter 28 via an amplifier 41 and a serially connected amplifier 42 and differentiator 43, respectively. In addition, input 30 voltages

31427А66

the first link 25 is connected to the input to the intermediate input 73, and the voltage is 3 models 1, and the current outputs of the terminal multipliers 14-16 - input 31 - to the output additional to the outputs 74-76. unit, subtractor 44, one of the inputs of which is g The protection device (FIG. 5) of which is connected to current input 2 is modeled by three blocks of 77–79 increments of 1, the other input is connected via serial self-tuning models power transmission channels, self-tuning channels 45, amplifier 46 and active resistance differentials (combinator 47 - with input voltage 80 and integrator 81) and inductance 3 models 1. Second inputs multiply (adder 82 and integrator 83) models 37 and 38 each of the links 23 - whether the line has a small extent 27 model 1 are combined together, Pa: parameters of a long line model (intermediate sum image input unit 48. Matora 84 and integrator 85), lines

A circuit 19 for forming the output 15 delay 86-89, the converter 90 for voltage and current of the model of a long line into voltage and the block 91 of the formation are filled with a multi-link; Each of the operation characteristics vanilla, links 49-51 contains an adder 52. The device operates as follows with three inputs and a subtractor 53, first.

the inputs of which are the inputs 20 Imagine that the protected ones are 54 and 55, the outputs - the transmission outputs 56 and 57 consist of a section of voltage and current of the link, the output of the long line and the adjoining adder 52 through a successive line section of a small circuit Female-connected differentiator 58 and mind. Each of these sites is connected to one of 25 with its replacement circuit: the inputs of the first additional mode are a long line segment, traditionally a torus 60, the output of which is connected to the multi-link RLC circuit, the free input of the subtractor 53, the other segment with a line of a small path of the first additional summation input - an Rl-circuit, a matrix 60 and one free input of the ZO. The structure of the model of the line to be protected, the adder 52, the intermediate inputs used in the device will be 61 and 62 connected to analogs GOVERNMENTAL You are a similar circuit structure eamesche- passages 35 and 39 corresponding zve- audio. It consists of two independently on model 1 long transmission lines, the third input parts: models 1 and long adder 52 through an additional smart and models 4 lines a small protrusion 63 connected to the output of secondary, The additional adder 64 itself is input-tuned. But if the tuning of the dow of which is connected to the first input of both parameters) in the - active co-reader 53 by means of the first tapering R and inductance 1c of the amplifier 65 and cascade-connected Q devices 4 lines of a small stretch differentiator 66 and the second amplification There are difficulties, then 67, Free inputs of multipliers; the configuration of the multi-link model 1 is 59 and 63 lengths combined with each other; a common line leads to a considerable time the third intermediate input 68 complicates the device due to a large link. Input 55 of the circuit for forming the number of adjustable parameters. The first link 49 is connected to the output to prevent this from occurring. All the links of the additional differentiator 47 models of the 1 long line are identical with the model 1 with the long LEP. Active resistance JuRo, inductive. As the formation circuit 20, the output voltage t LO and the capacitance jltd, the output voltage of the line model is not g - (Fig. 4), where RO, Ic, Cc are primary long distances, the line parameters are used, - the tunable additional line model is a small parameter. This will allow a distance device containing multipliers to maintain the correspondence between the segment 69 and 70, the differentiator 71 and the sum of the long line and its model I torus 72.c (. Setting only one parameter;

Intermediate input 48 of each of - Both transmission line models are configured with single links 25 - 27 models 1 long-line. temporarily. At the same time, the input and value are combined with the free entrance of the subdivisions for the model 1 of the long line - additional multiplier 45 and under-; the voltage U and the current ij

A device for a small extension of model 4 is a current i at the output of model G for a long line.

The task of the device is to configure the parameters / lif, RK and L (in the same way as the CMM, so that the difference between the output and output of the model 1 long line U) n. and models 4 lines of the greatest extension and 1,,) - U, (t) (1)

st1 emsh1 to zero. The quality of model tuning in the course of changing the parameters JU of RK and Lc is estimated with the help of some limited functional E. They are, for example, the functional

four).

(2)

“Sjjj. U (t -i: p-U (t -) is a non-viscous, when calculating which signals obtained with a delay of 25 C O, 1.2) are used over time.

Since during the tuning of models 1 and 4, the device reduces the unrecognized value C (€; 0), the functional (2) will decrease continuously, approaching the point of its minimum. Then the setting of the parameters jJi, R (and. Is reduced in proportion to the rate of change of the functional by the same parameters

yvdE

 H-is

(3)

where g I, RI, U;

jO is a positive coefficient

the value of which sets the speed for setting the parameter g. The minus sign in front of the right-hand side of equation (3) means that the adjustment of the parameter g leads to a decrease in the functional E, Expression (3) is a general view of the settings of models I and 4 in aircraft. Substituted into it (1) and (2) , get specific parameter setting equations:

dt

W. ) With f bo-fcit-r fd. ys.it :: Tgil; © m Z Q V 1

(

Y f- s. OG t .-

-n / Cs- ° K 2% R fc V -0

ib - "t t n- -" t - r- The expression under the sum sign on the right side of each of the equations (4) sets the rate of change of the tunable parameter and is determined in the corresponding block of 77-79 increments of the device.

The missing partial derivatives are determined, Snaia records expressions for and and and. The first of these is obtained directly from the equation of the RL-model 4, assuming that there is a flow to it;

U t-Tff) "R (t) i (t- t) +

-Mjt) linip -s:. (5)

(A)

g

, the second is found, using fig, 4, of the recurrence relations relating 45 input and output values of each link of the model with a long power line 12: at ffl / 1

U (t -Te) in U (t -Teg) - 50 .j (t) Roi, (t -f) - H (t),

55

. i, "(t -) i., (t - Trf) - -, (t) C.

with m «1

U, (t -1) - U (t -TG),

i, (t -Te) i (t -r) Ktyc - S i,

(eight)

where e is 0,1,2.

In this case, the quantities involved in determining the signals U (t -fg.) And iirt (t -Tg-) are taken at different points in time: the recurrence values are delayed by ts in time, and the parameters of the TL RK (t) model, L, t (t) and f (t) - at the current time t. Such an order of assignment is determined by the type of the adopted functional and, as noted above, is dictated by the principle of unambiguity setting up the TL C model uniqueness of determining the parameters jtt, Rj and L

Expressions for partial derivatives are written as follows: according to (5)

 -ts-l

 EC

i, (t-tV); y i | -i: i

RJt)

. Sju

-.) fj.

according to (6) and (7) with m

t) Ujiit -ed

-V

Wah;

 dju

- Roi .-. (T - f.) - .zM.

- (t)

 four

., Sin-lit GGWO

 +

40

(eleven)

- C.

Uh

"L4: it 3jffi

.

.b (t.-5ffl

. (dy, i |., 5.i. (, .4.i.

45

(12)

To implement the block increments, expressions (1), (6) (12) are sufficient. As follows from (10), the RL-model of the small-length line can be used as the sensitivity scheme of the UK voltage by parameter. A signal proportional to

The block as part of the protection device whose circuit is shown. In FIG. 5, works as follows.

50

55

,

five

U 15

20

25

thirty

35

40

;

45

)

 .

50

55

If the line and 4 models are tuned, then the fx error. (0,1,2) are equal to zero. Also equal to zero and the right part of equations (4), in connection with which the device is in equilibrium and setting parameters jy, R and L (not done.

In the case of frustrated models 1 n 4, the f-misses are computed in the subtractor 12 of the corresponding increment block (with G 0 such block is block 77, with in 1 — block 78, with G 2 — block 79), are not equal to zero . The device, trying to reduce them, triggers the channels of self-diversion. The latter begin by setting the parameters R | t, and jij of models 1 and 4, subject to their change by equations (4). After some time, models 1 and 4 tune in and the device comes to balance.

As can be seen from equations (A), the parameter setting rate is determined by the product of the error (5fv and derivative. The signals U and CC are necessary for calculating the error .g. Are supplied to the wires of the subtractor 12 from the outputs 18 of the 1-line voltage model and the 4-line model is small extension (output of the adder P), Model 1 of the long line consists of several links, each of which is made in accordance with equations (6) - (8) and the circuit shown in Fig. 4, and contains a circuit defining fall through; ras on longitudinal RL-circuit: differentiator 43, amplifiers 41 and 42, an adder 40 and a multiplier 38, and a circuit that calculates the capacitive current of the link: differentiator 34, amplifier 36 and multiplier 37.

The partial derivatives required to adjust the f-i parameter, Oifi / fljU, are calculated in model 13 of the error sensitivity by the tunable parameter 0 Sv./ | containing two separate sensitivity circuits, a voltage sensitivity circuit U (on the model 4 output, a small length by parameter JU, designed to determine the derivative of Ei. /, containing differentiator 71, adder 72 and multipliers 69 and 7 (realizing expression (10), and a sensitivity circuit of the output voltage of the current 1 of the model 1 of the long line by the parameter JU, which is used to calculate. and

period of the industrial frequency signal)

Thus, in the proposed block, the adjustment of models 1 and 4, depending on the distance to a short circuit, it flexibly rearranges the structure of the model of the protected line.

UU2746610

c) if, / 3 "and performed as a multiple frequency), guaranteed

(blocks 49.- 51), Each of its links is stable operation of the device and accepts equations (6) - (8), my tuning speed, my index m, takes a value by one (the running time is no more than the link number and prepares the necessary signals for the following; th signals; the desired quantities

 and c i / Informed last, in detail, is a device from the (n - 1) link (Figs. 3 and 4). 10 live any change that has occurred

In the calculation of 9i / b | and knife-. in the mode of operation of the protected line, In iHO, conditionally select several stages. ; In determining the derivative of |, the term in the figurative brackets of the expression is first calculated. (11) (with 15 adjusting the specific weight of one or another; by the power of the differentiator 66, amplified line models. If the length of the bay is 65, 67 and the adder 64), and then the protected line is quite large, then

it multiplies in multiplier 63 the correspondence between it and the power line model

signal proportional to / i and is supplied by adjusting the data to intermediate input 68, Z-20 is predominantly a long model, the magnitude thus obtained, otherwise the main load will be added to the adder 52 with sigals acting on its remaining inputs: the derivative and ,, and the voltage falling on the unit of the spine line 25 when current flows through it, the first of these values is removed from the corresponding output of the previous link of the sensitivity circuit, and the second is calculated in the corresponding link e long-line models using differentiator 43, amplifiers 41 and 42, and adder 40, and lead to intermediate input 62, wherein the gain factors of amplifiers 41 and 65

equal to R, and amplifiers 42 and 67 - LS. links) models of a long line are not

Next, locate 0Uf ,, calculate the derivative / c / a: first, the determinants do not affect the structure enclosed in the figure of the protection device.

Expression brackets (12) (differential – torus 58, multiplier 59, and adder 60 with Co gain), and then subtract it from the subtraction model of line 4 of a small extent.

The area of operation of the device is set by the characteristic formation unit. A possible variant of the characteristics of the operation is shown in FIG. 6, it studies the structure of the adopted model of the LEB: the vertical axis provides the Ten parameter fU of model 1 of a long stick and the horizontal R. the parameters R. and L and Models 4 small lines.

At the same time, changing the order (number of bursts) of a long line model does not change the number of parameters tuned. Thus, the presence of constructive connections established in the increment block of parameters of the self-adjusting model of the electric line 53 makes it easier, therefore

Claims (1)

The derivation of 3Uj; / 9Rj derivatives with a protection device using it according to (9) does not require its composition, the use of special circuits is sensitive. They can be half the formula of the invention directly from the 4 LEP model The unit of increments of parameters of the self-adjusting model of the power line, containing the self-adjusting model of the line of small length, made on two multipliers, the first input of one of which is connected through a differentiator to the similar input of the other and a small trunk (Z,) / 9К; - the signal at the input 8 of model 1, and OU | / 9L | - the signal at the output of the differentiator 7), Odds 1sh Xl ifv. Systems (A) are selected from the convergence conditions for model tuning. Studies have shown that at 1 (c (V), Y -) and 1 () (nominal frequency of the signal is about 50 55 The input to the model, and their second inputs are intermediate inputs period of the industrial frequency signal). Thus, in the proposed block, the adjustment of models 1 and 4 of the Vedel (time to work is not more than The device keeps track of any change that has occurred. Depending on the distance to the short circuit, it flexibly rearranges the structure of the model of the protected line.  in the mode of operation of the protected line, V is set by adjusting the predominantly long line model, otherwise the main load will be links) model long line not The ditch does not affect the structure of the protection device. line 4 model of small extent. The area of operation of the device is set by the characteristic formation unit. A possible variant of the characteristic is shown in FIG. 6, it teaches the structure of the adopted LEB model: the vertical axis provides the Ten parameter fU of model 1 with a long stick, and the horizontal one - with parameters R. and L and the model 4 lines of small extent. In this case, a change in the order (number of bursts) of a model of a long line does not change the number of tuned parameters to the model input, and their second inputs are intermediate inputs models and connected to the same inputs of the block, and an adder, the inputs of which are connected to the outputs of the multipliers, the output of which is the output of the model, the reader, one of the inputs of which is connected to the output of the model of the small extension, and two terminal multipliers, the first inputs of which are connected with the output of the subtractor, and the second inputs, respectively, with the input and output of the differentiator, characterized in that, in order to expand the functionality, it has additionally introduced models of a long line, whose inputs are with the inputs of the block, and the current output of which is connected to the input of the model of the line of small extent, and the voltage output to the free input of the subtractor, the sensitivity model of e-visc on the tunable parameter of the long line model including Thu Fig.Z The sensitivity circuit of the output voltage and the current of the long line model and the output voltage of the small length line model according to the specified parameter and the subtractor, the output of which is the output of the sensitivity model of the netscale, and the input of the sensitivity circuit of the output voltage of the small line model is connected to the output of the sensitivity of the current of the sensitivity circuit of the output voltage and the current of the long line model, the output of the sensitivity of the voltage of which is, like the output of the sensitivity circuit of the output Nogo voltage line pattern small T prb- field intensity, is connected to the corresponding input of the subtractor yuschemu model In addition, another terminal multiplier is added to the block, the inputs of which are connected to the outputs of the mentioned readers. 5 fput, 6