SU1317563A2 - Device for automatic controlling of electric load - Google Patents

Abstract

This invention relates to the field of electrical engineering. The purpose of the invention is to increase the reliability of electrical equipment. To achieve this goal, a block of 11 time delays is entered into the device. The signals on switching on or off the load from the switchable load detection unit 2 interrogate the corresponding cell of the storage device 12, where previously the value of the time delay was recorded from the setpoint control panel 23, which is necessary to avoid unacceptable network overloads. This time delay value on the leading edge of the clock signal (29) is recorded in time counter 14, and the trigger 15 opens the AND 13 circuit, simultaneously closing the AND 19 circuit. Signals from timer 18 arrive at the subtracting input of the time counter 14 until it is zero. The overflow signal from the output of the counter 14 sets the trigger 15 to the zero state. The zero output of the trigger 15 sets the time counter to the zero position and opens the AND 19 circuit for inputting signals to the counting input of the synchronization circuit. Thus, the unit is prepared for the analysis of the next load. 1 il. (L in, Dj U oo ate Oi oo N

Description

The invention relates to electrical engineering, namely, automation of control of electrical consumption by industrial enterprises during hours of maximum load of the power system, and can be used in any industry to limit power consumption at a given level.

The object of the invention is to increase the reliability of electrical equipment.

The drawing shows a block diagram of the proposed device.

The device contains a block 1 for selecting control objects, a block 2 for determining the disconnected load, a block 3 for error, a block 4 for determining the required adjustable power, a block 5 for determining possible MONOTIUM, a block 6 for receiving informant, sensors 7 for power consumption, b; 9 time limits, control panel 10, block 11 time delays, which includes: memory 12, AND 13 circuit, time counter 14, trigger 15, control output 16; the control unit 17, which includes: timer 18, circuit 19, synchronization circuit 20, start trigger 21, load address counter 23, setpoint control 23, control output 24, clock outputs 25-30, load address output 31, output 32 recording control and output 33 setpoint values.

The device works as follows.

Information on electricity consumption comes from sensors 7 to the input of information receiving unit 6. The information receiving unit 6 (IPP) performs a sequential interrogation of the sensors 7, selects useful signals against the background of interference, which then arrive at their own weight factor for conversion to the named units. to the input of block 5 for determining the possible load (Pb). At the same time, block 6 determines the current power (Rtok.) Averaged over a selected period of time, for example, 1-5 minutes.

The unit 5 for determining the possible load from the information received from unit 6 and the value of the power applied (Pb) from the control panel 10 performs, using the time stamps received from timer 18, a calculation of the possible power (Pa) that the consumer can use to the end controlled period of time, for example, half an hour, during the hours of maximum load of the power system, there is no risk to exceed the specified power limit. The calculation of P is made by the formula

p 0,5-Re-Etsk

 0.5 / tf.

where Esk is the electricity consumption from the beginning of the controlled half an hour during the hours of maximum load on the power system;

/ tech - the time that has passed since the beginning of the half hour; 0.5 - 30 minute length of time.

0

The unit 4 for determining the required regulated power (PM) by the signal from timer 18 determines the difference between the value of the current power supplied from block 6 and the value of possible power supplied from block 5:

P „Yatek-Rv

The value of the required regulated power (PH) with its sign goes to the first inputs of the error block 3, the second inputs of which receive the value of the power off (Roth) from the block 2 determining the value of the load to be switched off. The error block 3 is a conventional combinational summer, which performs the functions of determining the difference

DR P „-Rotkl

The control unit 17 controls and synchronizes the operation of the units of the device. It contains a timer 18, which 0 generates the value of the current time (/), the averaging time stamp to determine the current power (Rtc) in block 6 and the possible power (Pk) in block 5, as well as the time stamp when comparing the RTSC with PB in block 4 with the simultaneous initial discharge of block 2 for determining the switchable load. The generator output of the timer is connected to the first input of the AND circuit, the output of which is connected to the counting input of the synchronization circuit.

The synchronization circuit 20 is a counter with a decoder. It provides six clock signals (25-30). 30 of the circuit 20 is connected to the counting rokhody counter 22 addresses of the loads. The counter size 22 is determined by the number of loads involved in the regulation. The frequency of the signals arriving from the timer to the input of the synchronization circuit is chosen so that for a selected period of time, for example 20-60 s, it was possible to interrogate all controlled loads from the counter 22 of the address of loads, and each address of the selected load corresponds to a complete set of synchronizing signals from the circuit 20 synchronization.

five

0

five

0

From the control unit 23, the settings are made for each load, the setting limits are set in the block, which characterize the possible time for the load to be disconnected, and the set delay indicating the time required to reach the stationary state of the power supply network after each load on or off. At the same time, the address of the selected load is entered into the counter 22 load addresses.

A trigger trigger 21 serves to prepare the time limit block in its initial state upon initial installation of the control panel 10 by the signal "Reset. After the termination of the signal "Reset synchronization circuit 20 and the load address counter 22 start to work. All memory cells of the limit setting block, which stores the load disconnection time, are reset until the overrun signal from the counter 22 start trigger is set to the state "1.

The time limit block contains a memory device for storing settings for the longest possible disconnection time of the loads involved in the process of regulating the power consumption mode. The settings are set by the dispatcher from the console 23 to preset the settings. At the same time, the time limit block determines from the load selection block 1 from the load selection block 1 the time for which the load was disconnected, compares it with the set value corresponding to this load and, if the shutdown time exceeds the set point, it issues a signal to block 2 load, indicating the need to disconnect the load or put it into operation.

Block 11 time delays operates as follows.

The signals on switching on or off of the load produced by block 2 for determining the switchable load, which together with the load address (31) are the address inputs of the storage device 12, indicate the corresponding cell, where the value of the time delay is recorded from the setting control panel 23 Avoid unacceptable mains overload after switching on or off this load. This value of the time delay at the leading edge of the clock signal (29) from the control unit 17 is recorded in the counter 14 of time. According to the clock signal (29) from the control block 17, the trigger 15 is set to the state "1, opens the AND 13 circuit and simultaneously closes the AND 19 circuit. Signals from the generator output of the timer 18 through the And 13 circuit begin to flow to the subtracting input of the time counter 14. This process occurs until the counter is reset. In this case, the overflow signal from the output of the counter 14 sets the trigger 15 to the state "O." The zero output of the trigger 15 in this case sets the time counter 14 to the initial zero state and opens the AND 19 circuit for inputting signals to the counting input of the synchronization circuit, and the single output of the trigger 15 closes the AND 13 circuit. Thus, the block is ready for the analysis of the next load.

Block 2 definition of disconnected load works as follows.

The error block 3 subtracts from the value of the required power of the shutdown coming with its sign from block 4,

the value of the power already turned off, coming from block 2.

If the difference of AP from block 3 has a positive sign, then it is necessary to disconnect part of the loads involved in the regulation. In this case, unit 2, using the signal (27) from the control unit, analyzes the address of the load (31) received from the address counter 22, and the signal on the load condition coming from unit 9 of time limits. In this case, the options are possible:

1. Selected at this address the load is already disabled

if the shutdown time does not exceed 5 setpoint, then the transition to the analysis of the next load is made, if it exceeds, then block 1 is given a signal about the need for it to be put into operation, and the ROTCL value supplied to the input of the error unit is reduced by 0 cic power of the load.

2. Selected load at this address is included

if the time of its previous shutdown does not exceed the specified setpoint, then in block 1

5, a signal is issued for its disconnection, and the electric power value of the given load is added to the ROTCL value; if it exceeds, then everything remains unchanged and a transition is made to the analysis of the next load.

0 If the difference in AP from block 3 has a negative sign, then the absolute value is compared with the threshold (/ 7), the value of which is set from the control panel. In block 2, the load is switched on regularly, and if. This means that the disconnected loads remain unchanged. The value of I is chosen from the condition that the threshold value (P) is greater than any of the loads.

Block 1 of the selection of objects of regulation 1 operates as follows.

The signal (31) from the counter 22 of the load address of the control block 17 to the block 9 of the time limits and to the block 2 for determining the value of the switchable load is output

5 control signal about the state of the selected load ("On / Off"). The response of these blocks will be the issuance of control signals from block 2 to enable or disable the selected load. The control panel 10 allows you to call

0 to indicate the time value of P, to launch the entire device, and also to set the required sensitivity thresholds and the requested power.

The proposed device makes it possible to arrange in time the switching on of different types of loads and to avoid emergencies arising during the fast switching on or off of electric loads. Ability to set time measurements

delays when switching on loads allows optimizing this process.

Claims (1)

Invention Formula Device for automatic control of electrical load auth. St. No. 1181059, characterized in that, in order to increase the reliability of electrical equipment, a time delay block is inserted into the device containing a time counter, a trigger, an AND circuit, a memory device whose address inputs are connected to control outputs of the switchable load definition block and to address outputs the address of the control unit address, information inputs and the record control input are connected to the corresponding outputs of the control panel, the settings of the control unit, and the information outputs to the installation inputs of the counter time control, the input of which is connected to the corresponding output of the synchronization circuit, the input of the reset control of the time counter is connected to the zero output of the trigger, the R input of which is connected to the transfer output of the time counter, and the S input to the corresponding output of the synchronization circuit of the control unit, - the trigger output is connected to the first input of the AND circuit, the second input of which is connected to the generator output of the timer, and the output of the AND circuit is connected to the subtractive input of the time counter, and the circuit and the generator output of the timer is connected to the counting input of the synchronization circuit through the first input of the circuit I, the second input of which is connected to the zero output of the trigger of the time delay unit.