SU1432661A2 - Arrangement for optimization control of power distribution in power supply system - Google Patents

Abstract

The invention relates to electrical engineering. The purpose of the invention is to improve the accuracy of power distribution. The device contains regulators of modulus 1.1-1.N of generators 2.1-2.N connected to buses 9 of load 1t via switching devices 3.1-3.N. The signal from the outputs of the power sensors 4.1-4.N generators is fed to the inputs of the adder 7. Information signals from the second outputs of switching devices are fed to the inputs of the decoder 5. Signals from the output of the adder 7, carrying information about the load power, and signals from the decoder 5 about the number and the number of included generators is fed to the inputs of block 6 optimization. The optimization block contains logic elements and nonlinearity blocks, in which the optimal power for each generator depends on the total load power for different combinations of the included generators. From the outputs of the optimization block, 6 signals proportional to the optimal power of the generators are fed to the inputs of the power controllers 1.1-1.N. Accuracy increases as a result of the fact that a block of 8 settings is entered, the signals at the outputs of which appear depending on the power of the load. Owing to the occurrence of a signal in one or another output of the block of settings for parallel operation, the optimal number of generators is turned on. 6 ill., T tab. a (L 4 00 to f O)

Description

N3

The invention relates to electronics, in particular, to technical means of automation of multi-unit electric power systems (ES), in particular, ship systems containing several sources of electric power, and is an improvement of the device according to the author. No. 1396210,

The invention solves the problem of automating the control of an EPS, for example a ship, by using general units, including diesel generators, pars and gas turbine generators, shaft generators, mounted generators, batteries, etc., in stand-alone or parallel operation modes by the criterion of the minimum cost of a given (required) value of the power generated by the EPS. With the greatest effect, the invention can be used in the creation of control systems for multi- gregate EPSs, which are characterized by frequent changes in use modes and on-power values.

The purpose of the invention is to improve the accuracy of power distribution.

Fig. 1 shows a block diagram of an apparatus for optimal control of the power distribution of an electric power system; Fig 2 - switching device; in fig. 3 - optimization block; in fig. 4 is a two-input logic element of the optimization block in FIG. 5 — an optimization unit for the case of using three generating sets in the electric power system; FIG. 6 is a block of settings.

The device (Fig, 1) contains N. power controllers 1, generator sets 2, switching devices 3, power sensors 4, as well as a decoder 5, optimization block 6, adder 7, setpoint block 8 and network 9, while the i-output (, N) of optimization block 6 is connected to the i-ro input of the power regulator 1.1, the output of the power regulator 1.1 is connected to the input of the generating set 2.1, the output of which is connected to the first input of the switching device 3.1, to the BTdpoMy input of which the Start bus 10.1 is connected, and to the third generalized input - the corresponding generalized output of the block 8 settings, per- Bbrii output comm Utah device 3.1 is connected to the input of the sensor 4.1 power, and the second output - from the 1st

fo 5 jq 25

ZO e.

five

the decoder 5, the first output of the power sensor is connected to the 1st input of the adder 7, the second to the network 9, to which the load 11 is connected, the output of the adder 7 is connected to the input of the setpoint unit 8 and the first input of the optimization unit 6, the second generalized output of which connected to the generalized output of the decoder 5,

The switching device 3, (Fig. 2) contains the bus Earth 12, the one-oscillator 13, the element OR 14, the amplifier 15; a relay coil 16 with two closing contacts 17 (power) and 18 (informational), a constant voltage source 19, the output of the one-oscillator 13 is connected to the first input of the element OR 14, the output of which is connected through a series-connected amplifier l5 and the winding of the relay 16 is connected in the earth bus 12, the first input of the switching device 3 is connected via a closing contact 17 to the first output, the output of a constant voltage source 19 through the closing contact 18 is connected to the second output of a switching device 3, the second input of which is single input The selector is 13, and the third generalized input is the set of the third inputs of the element OR 14.

Optimization unit 6 (FIG. 3) contains N elements OR 21 () of key elements 22, (2 -1-N). Logical elements 20, Logical elements 20 are connected in the form of a pyramidal hierarchical structure of (N-1) levels. The first level contains a single-input logic element 20, Each

, N-C) -t) 1

five

O

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The ij-th level (, N-1) contains C two-input and (p. + N-rv - i) + single-input logic elements 20, the first output of the logic element 20 (g1 1, N-2) level is connected to one of the inputs two-input logic element 20 (v + 1) -ro level, the second inputs of two-input logic elements 20 and the inputs of single-input logic elements 20 are connected to the outputs of the Corresponding key elements 22, the second outputs of logic elements 20 -J-ro (. 1, N -2), two outputs of each logic element 20 (ND-ro level, as well as the outputs of N key elements 22 are connected to the corresponding mi inputs of the corresponding e-lemeite OR 21, the first input of block 6 optimization

314

is the generalized information inputs of the key elements 22, the second generalized input is the set of control inputs of the key elements 22, and the outputs are the outputs of the OR elements 21.

The two-input logic element 20 (FIG. 4) contains a two-input element OR 23, a nonlinearity unit 24 a delay element 25 and an adder 26, while the output of the OR element 23 is connected to the input of the nonlinearity unit 24 and the input of the delay element 25, the output of which is connected to the summing the input of the adder 26, the output of the nonlinearity unit 24 is connected to the subtractive input of the latter, the inputs of the logic element 20 are the inputs of the OR element 23, and the inputs are the output of the adder 26 and the output of the nonlinearity unit 24,

The one-input logic element 20 does not contain the element OR 23. It is - the input is the combined inputs

block 24 nonlinearity and the element 25 of the delay.

Optimization unit 6 for three generating units 2 (Fig. 5) contains seven key elements, four logical elements 20, including one two-input 20 and three single-input 20 123 20,, 20, three elements OR.

Block 8 settings (Fig, 7) contains M elements 27 installations, the inputs of which are combined and connected to the output of the adder 7, the set of outputs of the elements 27 settings, forms a generalized output of block 8 settings. The output of each element 27 of the setpoint is connected to the corresponding input of the third generalized input of the corresponding switching device 3, Element 27 of the setpoint, 1 (, M) produces a signal equal to a logical unit, if the input signal and j lies within certain limits, t, e. condition (1) is fulfilled:

(one)

UT and ... 4 u-,

-1M14HBX J laaKC

where and and and are, respectively, the minimum and maximum threshold voltage settings.

If condition (1) is not met, then the signal at the output of the jth setpoint is zero.

Block 24 by nonlineine diode lop; -; -. -. i o elementp 20 realizes the optimal dependence of the power L jj, generated by three generators: and by the units 2.1, 2.1, 2.3, on the power P, generated by the generating unit 2.3. iJjj; ki 24 are nonlinearities of logical elements 20,, 20, j and regulate the optimal dependencies of L, jf (Pp; L., jf (РЗ) and L ,, f (P}), respectively, where L j, L, j, L, j3 -power generated by the generator units (P, P), (P, P), (P, P-), respectively.

The device works as follows.

The operator on the splint Start gives

 tt

the signal to the second input of the switching devices 3 (in this case, the generating units 2 are previously gzklmch - :: - and are idling. It is possible that the Start signal is fed to the corresponding inputs of the generating units 2 for their commissioning. (the link is Fig, 1 not shown).

In the switching apparatus 3 (Fig. 2), the signal to the bus 10 is fed to the input of the one-shot 13, which Begins to signal a signal of duration i. The output signal of the one-shot 13 through the element OR 14, the amplifier 15, the winding of the relay 16 is fed to the earth bar 12,

With the passage of this signal through the winding of the relay 16, the relay operates and closes the power closing contact 17 and the information closing contact 18.

The voltage from the output of the generator set 2 is fed through the power contact 17 to the input of the power sensor 4. At the same time, a signal from a constant voltage source 19, equal to a logical one, is fed through the nii-switching contact 8 to the corresponding input of the decoder 5,

The output signals of the decoder 5 are fed to the control inputs of the corresponding key elements 22 .. of the optimization unit 6 (Fig. 3),

The currents from the outputs of the generator units 2 through the switching appr. 3 and 3 and the power sensor 4 are fed v cross section 9, and then to the load 11,

Power sensors 4 produce a signal proportional to power

generating unit 2, and delivers it to the appropriate input of the adder 7,

Adder Output 7 L | Z is fed to the information inputs of the key elements 22 of the optimization unit 6 and to the input of the setpoint block 8, in which (FIG. 7) each setpoint 27 checks the execution of the job (1). If condition (1) is satisfied for any element 27 of the setpoint, then a signal appears at its output, which is fed to the third generalized inputs of the corresponding switching devices 3. In switching device 3 (Fig. 2), this signal is sent to the corresponding ; element input OR 14, (the duration of the output signal of the one-vibrator ipa 13 is chosen equal to the appearance of the first signal from the output of the element: 27 settings after the device starts working), the output signal of the element OR 14 through the amplifier 15 and the winding of the relay 16 is fed to Earth Bus 12, Comte You 17 and 18 of the switching devices 3, on the second control inputs of which the signal was sent from the corresponding setting element 27, are closed, (contacts 17 and 18 of the switching devices 3, on the inputs of which the signal from the output of the setting element 27 are open, are respectively open. there are no single signals at the second outputs of switching devices 3,

When the output signals of the decoder 5 change, the signals at the control inputs of the Key elements 22 (FIG. 3) change accordingly. The output signal of the adder 7 L through the open key element 22 of the optimization block 6 is fed to the corresponding inputs of the corresponding Logical element 20,

L signal

,, input

th signal L

1 ... N

on vEhode block 24

a nonlinearity a signal appears that is proportional to the optimal power N-ro (RK) of the generator agLogic element 20 of the first level, in which the signal through the element OR 23 (if the element OR 23 mt, then directly) is fed to the inputs of the nonlinearity unit 24 and element 25 delays. The input to delay element 25 is provided to summing input of adder 26,

Depending on the value of the input

regatta 2, N, which is fed to the corresponding input, one of the element OR 21 and the subtracting input of the adder 26, the output of the adder 26 appears

 1 ... (N-f) 1 ... N, N which

is supplied to the corresponding input of the corresponding logic element 20, (To ensure the output signal appears at the output of the adder 26 while simultaneously appearing the signals at its inputs, there is a delay element 25 before the summing input of the adder 26. The delay time of this delay element 23 is equal to the time interval between the arrival of a signal at the input of the block 24 nonlinearity and the appearance of a signal at its output).

The output signal of the adder 26 is applied to the second input of the corresponding element OR 21, the output signals of the element ment 21 or 21 appear at the inputs of the power controllers 1 (Fig. 1) The output signals of the power controllers 1 are set so that the generating set 2 provides the necessary (optimal / power.

When the load power 11 is changed, the device operates in the same way, depending on the load power, the signals at the output of the setting elements 27 change, the generating units 2 turn into autonomous or parallel operation mode. Each generating unit generates the optimum power,

The table shows the connection of three generating units (GA) to the load, where 1 is the connection of the GA to the load; O - disconnection from the load.

moves.

D1i

234567

Numbers of LH 5 outputs, on which the signal is not equal to zero with the corresponding combination of included GA

714

As a result of using the proposed device, the accuracy of the distribution of power is enhanced by introducing feedback on the load. This increases the efficiency (cost effectiveness) of using the device due to the optimal generation at the cost of the required power.

Claims (1)

Invention Formula A device for optimal control of the power distribution of the electric power system according to the author. 18 fr 1396210, characterized in that, in order to improve the accuracy of the power distribution, it is equipped with a setting block, the input of which is connected to the output of the adder, each switching device is equipped with a single-oscillator and an OR element, whose inputs are connected to the corresponding the outputs of the setpoint block, with the single-vibrator connected between the first control input of the switching device and another input of the OR element, the output of which is connected to the element control switching device. With Vym9 (g98 FIG. 2  cSitixoMS I 20   k g - 20 .. tt 2 / go -t1 g . ypoBtm /.j a C8 code7 FIG.