RU2000640C1 - Method of automatic input active power control for industrial enterprises - Google Patents

Abstract

Usage: in the automation of energy management of industrial enterprises. Essence: measure the current power Ptek .. determine the directive power value Rdir .. and the regulated power DR. The predicted value of the current power P tech is calculated. If Rdir-P is 0, then the active power of the enterprise is reduced in LR. Correspondingly, the DRs are distributed among the business units by weighting coefficients, this value is compared with the DRPSn - the power by which the power of the department can be reduced without disconnecting the consumer regulators. If DR DRPSn, then consumer regulators are turned off. The DR unit of the unit is recalculated and this new value of the DR is compared with the DRPSn. The adjustment process is completed at DR 0.

Description

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The invention relates to automation of power management of industrial enterprises during peak hours or load limits of a power system and can be used in any industry to limit power consumption at a given level.

A technical solution is known in which the parameters of the technological process are monitored, compared with the set ones, control signals are generated that provide off-peak operation of consumers, as well as their forced switching on during periods of technological load decline.

Closest to the invention is a technical solution in which the consumption of electricity is monitored by consumers, the average value is determined

power for a certain time interval, calculate the possible load, compare it with the current one and, depending on the result of the comparison, affect the consumer regulators.

The disadvantages of these technical solutions are the lack of efficiency, since an unnecessary blackout is possible.

The aim of the invention is to increase the efficiency of regulation of active power consumption in all power consumption modes,

The method consists in determining the actual power actually consumed by the enterprise over a given time interval, comparing it with the value of the declared maximum or with the level of active power set by the power system, determined by N0 О О О О N

ABOUT

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dividing the allowed active power by the next time interval and managing consumers depending on the deviation of the actual active power.

The task of controlling the power consumption is to maintain the set value for fixed 30-minute intervals, each of which is considered as an independent period. The decision about the need for regulation is made at a predetermined time interval T, depending on the type of recording devices and the characteristics of the technological process of the enterprise.

The initial data for regulating the active power consumption by the enterprise is information received from the electricity metering subsystem, based on which the current active power of the enterprise Rtek and its units PTOK.I is calculated, the predicted average active power over the time interval T and 30-minute active power (Rtek .. Reo).

The decision on the need to control the consumed active power is made based on the analysis of the current day (working / output); the time taken for the maximum load of the system or unplanned power limitation.

Calculation of directive power for the next 5-minute interval is produced by the formula

30 / T Rogr-RT 30-N

rdir-30 / T - NRogr

NPorp - RTZO 30 / T - N

where is rogr. predetermined active power limitation level;

RTZO - average power in the current 30-minute interval:

N is the number of elapsed T-minute intervals since the beginning of the half-hour period.

The need to reduce the consumption of active power or the possibility of increasing it is considered at the beginning of each time interval T based on the Radar comparison. with the predicted current power Ptek, calculated by the average active power over the past time interval T (Rav.) and the average current active power Ptek. and in case

Rider - (3/4 Rtvk. + 1/4 Rav.) - Rdir. - R Tech. ABOUT

0

5

0

5

0

5

0

5

0

a decision is made about the need to reduce the consumed active power in the enterprise by

Ar 1Rdir- (3 / 4Rtec + 1 / 4Rsr) 1 r3U / T-N

where is the rider. - optimal directive power;

Rtek. - the actual value of the current active power for the previous minute;

Rav. - the average value of active power for the previous time interval T; and the distribution of business DR between units is performed. The allocation of the regulatory component for each I unit (DR |) is as follows:

Rogr. ™ 2. Piorp ..

where is piorp. - restriction value of the 1st unit;

I is the number of business units,

based on this expression, the coefficients K) of the shared consumption of active power of the units are determined:

K, - P | og

ogre

The power ratings P | dir are calculated. each unit P | Rider Ki;

the values of the actual excess (reserve) of power of each unit Zi are determined:

Zi - Pi - Rdir. 1,

where PI is the actual power consumption of the 1st unit; depending on the Zi value of each unit, the following amounts are calculated:

7.0 - excess of active power consumption by business units;

Zf is the value of the reserve of active power consumption by business units;

in the case of DR 0, the distribution of L P is made between units with positive Zi values according to the formula

, -Ј ,,

where is DR | - adjustable power of the 1st unit;

55 in the case of DR 0, the distribution is made between units with negative values of Zi no formula

LR ,,,.

Next, the state of consumer regulators is analyzed and the possibility of compensating for the value of DR | units by reducing the power of consumers without shutting them down.

The approach to analyzing the state of consumer regulators depends on the type of equipment used.

The following values are common in the analysis of the state of consumer regulators: power consumption at each stage of the technological cycle; the actual value of the consumed active power by the object at a given time; average value of consumed active power at each stage of the technological cycle; the value of a possible decrease in the active power of the consumer regulator, without leading to a disruption of the technological process; the required amount of electricity to complete each step of the process cycle.

The average value of the active power of consumer regulators over the elapsed time period (Pni) is calculated by the formula

R, t.

where aw | - consumption of active power by the 1st consumer regulator for the time interval At;

I is the number of consumer regulators in this production.

Then, the state of consumer regulators is analyzed: the number of currently operating consumer regulators; their technological condition; the value of active power is calculated, which can be reduced at the consumer regulator without disrupting the process

(DRpsi).

IF DR | DR | psn,

This reduces the active power consumption by the value of DR |. after that, the regulation process at this stage is completed.

If DR | D P | psn,

then, based on the technological conditions of the consumer regulators, shutdown priorities are determined.

Then, one of the consumer regulators is turned off, DR is recalculated | and get AP i:

AI APi - DRP - pi

where DRP - pi - the calculated active power of the 1st consumer is the regulator in the current technological phase.

In the case of DR | 0 the prrvmiponn process does not end; in the case of AP i h-0, the question of the possibility of compensation of AP i according to the previously described 5 algorithm is considered.

An analysis of the possibility of turning on consumer regulators that are turned off during the regulation process is performed at the beginning of each time interval T. 0

If

Rider Rogr.,

Rider - (3 / 4Ртек. + 1 / 4Рср.) 0, the calculation of the power reserve for

5 remaining time of the current interval:

DRREE. (Rdir. - Rogr.) (30 / T - N). Further, the distribution of the DRrve is carried out. between units. If the unit's api is sufficient to enable

0 of a certain consumer, permission to turn it on is generated and a new calculation of the unit APi, AP i is performed according to the above formula.

Claims (1)

In the case of AP i 0, consideration is being given to the inclusion of the next consumer. If switching on the consumer at the current interval T is not possible, the control process at this stage is completed. The claims 0 A method for automatically controlling the consumption of active power of an industrial enterprise, which consists in measuring the current active power of the enterprise in the measurement interval 5 RTek., Calculate the optimal directive power at the end of the controlled time interval T, determine the adjustable power of the AP taking into account the sign, and turn off the consumer regulators by the value of AR, if its sign is negative, which means that, with the aim of To increase the efficiency of regulation of active power consumption, the predicted average value of the current power Rtek for the time interval T is determined, the regulated power AP is determined as the difference between Rdir and RTek in the time interval T, if Rdir is Rtek 0. then production reduction of the active power consumption of the enterprise by the value of the regulated power of the AR, the AR for each business unit is determined in proportion to the share of the active power consumed by the business unit, the subdivision of subdivision 5 is compared with the value of the active power of this business unit, which can reduce the power of consumers without disrupting the technological cycle DRPSm. if the result of comparing these values is 7 20006408 If the current value is equal to or equal to zero, then the controller knob is reduced, the power of the consumer regulators in the D-DR unit is recalculated, a new significant unit is received by the value of the DR unit of the LR unit, you find the units without turning them off , if the ability to reduce power, the result of the comparison is more than zero, then producers of regulators without disconnecting them disconnect consumers, regulators, the regulation process is completed by the ditch in the sequence corresponding to their AR unit less than or equal to the technological state, while zero. barely turning off every next