JPS61141006A - Control system - Google Patents

Abstract

PURPOSE:To improve the control responsiveness by performing the simultaneous start/stop control with the maximum capacity in response to the present operating capacity within the load variation allowable capacity and the variation allowable range of a controlled system. CONSTITUTION:The cool/hot water is sent to the air conditioning load from a heat source device to plural pumps via a header. The start/stop of these pumps is controlled by a controller consisting of a processor CPU, interfaces I/F1-I/F4, a fixed memory ROM, a variable memory RAM, a timer TM, etc. Then the maximum simultaneous start/stop capacity is decided within the load variation allowable capacity of the receiving facilities and the variation allowable range of a controlled system and also in response to the present operating capacity. The simultaneous start/stop control is carried out with pumps of capacities less than said maximum capacity.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a control method applied to start and stop control of various controlled devices such as motors, pumps, refrigerators, and heaters. It is something.

[Conventional technology]

For example, when starting or stopping multiple water pumps for air conditioners, inrush current is suppressed and the voltage is In order to keep fluctuations below a certain value, each machine is started or stopped one after another at fixed time intervals.

[Problem that the invention seeks to solve]

However, in the conventional method, even if the load fluctuation tolerance capacity such as power reception capacity and voltage fluctuation characteristics is less than the permissible capacity, and the disturbance corresponding to the control of the controlled system is within the permissible range, one unit at a time must be The system starts and stops at fixed time intervals, and it takes a long time to change the operating status of multiple units, which causes a problem in which the control response of the air conditioning status is delayed. 0 This is a similar problem not only for power receiving, substation, and distribution equipment, but also for relationships with energy sources involved in the operation of various controlled equipment such as boilers and compressors.

[Means for solving problems]

The present invention has the purpose of fundamentally solving the problems of the conventional art, and in order to achieve this purpose, it is constructed by the following means.

In other words, the load fluctuation tolerance capacity of the energy source involved in the operation of the controlled equipment and the controlled system.

The maximum simultaneous start capacity and maximum simultaneous stop capacity of the target equipment are determined according to the current operating capacity of the target equipment, and the maximum simultaneous start capacity and maximum simultaneous stop capacity of the target equipment are determined according to the maximum simultaneous start capacity and maximum simultaneous stop capacity of the target equipment. It is assumed that control will be carried out.

[Operation] Therefore, the target equipment is simultaneously started and stopped within the load fluctuation tolerance of the energy source and the fluctuation tolerance of the controlled system, and at the maximum capacity according to the current operating capacity. Responsiveness in control via the target equipment is improved while satisfying the relationship with stability in response to changes in the control status of one control target quantity without exceeding the load fluctuation tolerance capacity of the energy source.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to figures showing examples.・ Figure 2 is an instrumentation diagram of a group of water pumps for air conditioners.
Water S is force-fed by a plurality of pumps P1 to Pn and sent to the air conditioning load as water WF via a header H2, and the pumps P1 to Pn are controlled by the control device CNT.
Starting and stopping is controlled by the engine.

In addition, the control device CNT sends and receives data to and from a host device (not shown in the figure) via a transmission path, and uses control calculations corresponding to received control commands and detected forces from various sensors S. The control output is determined to control pumps Pt-wPn and various actuators AC.

FIG. 3 is a block diagram of the control device CNT, which mainly includes a processor such as a microprocessor, interfaces I/F1 to I/F4, and a fixed memory ROM.
, variable memory RAM, oscillator O for clock pulse generation
A terminal equipment TE consisting of a display device, a keyboard, etc. is connected to the SC and a timer TM through an interface 17F1, and a transmission path is connected through an interface 1/F2 for transmission and reception. In addition, an actuator AC and a sensor S are connected to the interface I/F s, while a control signal for the pumps P1 to pn is sent from the interface I/Fa.

At ζ\, the processor CPU operates based on clock pulses from the oscillator O8C, and the fixed memory +3 R
In addition to executing instructions in the OM, it performs control while accessing specified data to the variable memory RAM.
The control timing is determined according to the timing of the timer TM by counting clock pulses, while the control is based on command data from the host device stored in the variable memory RAM, own management data, and detection data of the sensor S. Performs calculations and control decisions to control the pump P.
It sends control signals for 1 to Pn and actuator ACK ◇ In addition, the terminal device TEIC can display and input the necessary data, as well as update 1. It can be monitored and modified.

Note that 1. Tables to be described later are stored in the variable tatami mat AM, and these are used for judgments in controlling the pumps P1 to PF.

Figure 1 is a 7o-chart of the control status by the processor CPUK. The maximum simultaneous starting capacity and maximum simultaneous stopping capacity based on the pumping capacity of each pump pl-pn are used as the starting capacity and maximum simultaneous stopping capacity. , as well as each pump pt-PH
Each ability is individually stored in the variable memory U RAM, and the ranking table shown in Table 1 and the status table shown in Table 2 shown below are also stored, and these are used as necessary. In Table 1, Table 2, and Figure 1, we first calculate the total operating capacity of each pump currently in operation according to the operating status in Table 2 and the contents of the variable memo IJ RAM. Calculate MAXl and MAX2 from the current operating capacity using the method described below. Perform step 101 to determine the maximum simultaneous starting capacity MAX s and the maximum simultaneous stopping capacity MAX z, and then calculate each pump P.
For example, the first
As shown in the table, the device number is stored in the order table according to the order of activation (1102), and then the pointer for addressing this device and the first register for adding the simultaneous activation capability are set to 'pointer・1= 17 resistinat C5=O' 103 respectively %11 and 甚μ
Set 'OND elapsed since last startup? When #fH becomes jDY due to the time-up of the timer TM, the command for the pump pt at address l is judged based on the command aONt'112 to 11 based on the command data, and depending on Y of this, %l is currently OFF? '113 is checked according to the operating status in Table 2, and if it is Y, a new start is performed and the buffer register is 'Ct=Ct+
In C1'114, store the result of adding the capacity C1 of the amount of pump P in register 1, and check whether the contents of the buffer register have reached the maximum simultaneous activation capacity MAI.
Ct) MAXI? 1115, this is N(N
o) During %C1←Ci'121, the contents of the buffer register are transferred to register φ1, and then %1
The start command is stored in the memory 1122, this data is stored in a predetermined area of the variable memory RAM, and %t=
After adding %11 to the pointer by t+1 '123, '1=h? Step 112 and subsequent steps are repeated in response to '124ON.

Therefore, the command data is J for each of pumps P1 to Pn.
Before CON, it randomly gives an OFF command,
Only those pumps that are commanded to be turned on and whose total capacity is less than or equal to the maximum simultaneous activation capacity MAXs are selected according to the ranking in Table 1, and in step 122, their data is stored in a predetermined area of the variable memory IJ RAM. MAXr and MA depending on the current total driving capacity.
If X-z is determined and the operating ability is large, the controlled quantity will be easily stabilized even if the change in the control situation is large, and if the operating ability is small, control will not be achieved unless the change in the control situation is small. Since it takes a long time for the target quantity to stabilize, MAXl and MAXz should be set after satisfying the relationship between the controlled quantity and the control situation change tolerance characteristics.
The variation ratio of the controlled quantity becomes small.

In addition, MAX 1. MAX 2 is determined in consideration of the power source's load fluctuation tolerance capacity.

Next, as in step 101, the device number is stored in the order table according to the 1 stop order (1131), and then 1 pointer 1=1/register 2Cz,=-C1
' Set these to 133, set the pointer to %11K again, and set the contents of register ÷ 1 to register φ2 as negative 1 in order to cancel out the disturbance of the controlled system. After storing it as a value, judge the 1st group stop command A141 used in an emergency etc. in the command data, and then specify the change of the maximum simultaneous stop ability 'MAXz in the command data according to Y of this. Determine #142 and if this is also Y, 1 specified ability → MAXz ' 14
3 to update MAX z and ignore the elapsed time since the previous command? Determine #144.

If it is 'fN' in either step 141 or 144, OFD H! is returned from the previous stop, similarly to steps 111 to 113. Past? 'In response to 1510YK, is the command to 1 i by command data OFF? '152 and based on Table 12, is 'l currently ON? '153
, and if both are Y, a new stop is performed, and similarly to steps 114 and 115, 'Ct=Cz+Ci' 154 is sent to the buffer register, and the capacity C1 of pump P1 is set for the contents of register 2. After storing the addition result, check whether the contents of the buffer register have reached the maximum simultaneous stop capability MAX 2 -Ct) MAX2?
' Judging from 155, while this is N, %C2←
After transferring the contents of the register +2 to the register 7 by ct'161, store the stop command of %l in the memory in the same way as step 122 (step 1162), and then add to the pointer by %l=1+11163.
i=n? ' Repeat step 152 and subsequent steps via 164ON.

Therefore, according to the command data! If the pumps for which J OFF is commanded have a total capacity of maximum simultaneous stop capacity MAX 2 or less, they are selected according to the ranking in Table 1, and in step 162i/c, these data are stored in the variable memo +7.
It is stored in a predetermined area of RAM.

When each step above is completed, '1 output processing 1111
), it simultaneously sends start and stop signals via the interface I/F 4 to each pump to be started and to each pump to be stopped according to the contents of a predetermined area, and also sends start and stop signals to each pump to be started and stopped according to the contents of the predetermined area. 2 Update the contents of table.

Therefore, by keeping the load fluctuation permissible capacity of the power receiving equipment and the fluctuation permissible range of the controlled system within the range, and by determining the maximum simultaneous starting capacity and maximum simultaneous stopping capacity according to the current operating capacity, the total capacity will be less than these. Each pump is started and stopped at the same time, pump P]~pn
This will improve the responsiveness of air conditioning conditions through the air conditioner, and suppress inrush current and voltage fluctuations to below permissible values.
Moreover, in the controlled system, excessive fluctuations do not occur in the water flow rate as the controlled quantity.

FIG. 4 is a flowchart similar to FIG. 1 showing another embodiment. In this case, the maximum number of simultaneous startups MAX 3 and the maximum number of simultaneous stops MAX 4 are set as the maximum simultaneous startup capacity and maximum simultaneous stoppage capacity. 1, steps 114 and 154 in FIG. 1 are omitted, and step t01.1 is omitted.
03, 115, 121. 132, 155, 161 is step 201. 203, 222, 223, 232, 262
Figure 1 and t1y except that ゜263 is replaced.
The same is true.

That is, while using counters in place of registers φ1 and N2I/c in FIG. 1, pump P! Since the capacities of the ~PHs are equal to each other, calculate MAX3'-MAX4 from the current number of units in operation by z2o1*.
In addition to determining X 3 and MAX4'f, 1' pointer
l='1/Counter・C=O'203 does not perform preset, I C=C+1 '222 has Yoshika & Shita t-
Register and 'C==MAX3? # Check the total number of simultaneous workers on 223, then check the 1 pointer.
L-1/Force 6 Counter C=-C#232, reset the pointer again, and set the previous count value as a negative value in order to offset the number of simultaneous startups and the number of simultaneous stops. Set the counter, %C=C+1 “262 K
'Therefore, after adding the counter, %c÷MAX4?
'263 is designed to check the number of machines that are stopped at the same time.

Therefore, if the load fluctuation tolerable capacity of power receiving, substation, and distribution equipment and the fluctuation tolerance of the controlled system are within the tolerance range, and the maximum number of simultaneous startups and maximum number of simultaneous stops are determined according to the current number of operating equipment, then Figure 1 The same effect can be obtained.

FIG. 5 is a diagram showing specific means of steps 101 and 201, and shows an example of the relationship between the operating capacity Q expressed by the operating capacity or the number of operating units and the maximum simultaneous control capacity MAX1. Fixed value memo +3 R
After storing in OM, based on operating capacity or number of operating units <Q
Read the value of MAX i according to K, and set MAX' 1 to □
Allocate it to MAY 4.

゛Also, calculate MAX by calculating the following formula.
The same is true even if

MAXI=Q-Fi・・・・・・・・・・・・Town...
...(1) Also, F is a function determined according to the conditions.The limit value LM is determined according to the load fluctuation tolerance capacity of the energy source and the fluctuation tolerance range of the controlled system, and MAXi is set below this value. It is necessary to determine the time intervals OND and OF for start and stop control.
D may be determined by taking into consideration the control situation change response characteristic of the controlled quantity, prevention of backflow of the water supply WF due to sudden decrease in water supply pressure, prevention of hunting in control, etc.

In addition, the operating capacity may be determined from the controlled quantity, and the relationship between the water flow rate F and pressure P is as shown in Fig. 6 depending on the capacity of the pump and the number of pumps in operation (m). When operating the /g with a capacity of 100'f6, the injection amount F may be detected by a flow meter or the like and used as Q.

Therefore, it is possible to start and stop multiple pumps at the same time within a permissible range, and
Since the capacity for simultaneous control is determined according to the current operating capacity,
The control responsiveness via the target device is improved, and the stability of the controlled quantity is maintained.

However, in addition to water supply pumps, the target equipment may also be refrigerators, heat pumps, heaters, fans, etc.
Accordingly, as an energy source, in addition to an electric power source, a steam source such as a boiler, or a pressurized air source such as a compressor may be used. Or omit unnecessary ones,
Alternatively, it may be replaced with an equivalent one, and in FIGS. 2 and 3, depending on the conditions, the sensor S1 actuator AC may be omitted, or the timer TM may be configured and used as software. Various modifications are possible, such as determining the maximum number of simultaneous control units depending on the operating capacity, or determining the maximum simultaneous control capacity depending on the number of operating units, depending on the situation.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, a plurality of controlled devices can be controlled to start and/or stop at the same time within the load variation tolerance capacity of the energy source and the variation tolerance range of the controlled system. In addition to this, the maximum simultaneous start capacity and maximum simultaneous stop capacity are set according to the current operating capacity, improving the responsiveness of the current control situation of the equipment to be controlled, and improving the load fluctuation tolerance capacity of the energy source. Since the control condition is not exceeded and the stability of the control situation is sufficiently maintained, remarkable effects can be obtained in controlling various target devices.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, in which Fig. 1 is a flowchart of the control situation, Fig. 2 is an instrumentation diagram, Fig. 3 is a block diagram of the control device, and Fig. 4 is a control situation showing another embodiment. 70-chart, FIG. 5 is a diagram showing the relationship between operating capacity and maximum simultaneous control capacity, and FIG. 6 is a diagram showing the relationship between operating capacity and maximum simultaneous control capacity. 0 PI--Pn... Pump (control target equipment), CNT
@ @ 1111 control device, CPU-・0. Processor, ROM...Φ, fixed memory, RAM --, -variable memory, TM...timer.

Claims (1)

[Claims] In a control device that controls the start and stop of multiple devices to be controlled, the load fluctuation tolerance of the energy source involved in the operation of the target device and the fluctuation tolerance of the controlled system are within the tolerance range, and the load fluctuation tolerance of the energy source involved in the operation of the target device is within the tolerance range, and A control method characterized in that a maximum simultaneous start capacity and a maximum simultaneous stop capacity of the target equipment are determined according to the current operating capacity, and the target equipment is controlled according to the maximum simultaneous start capacity and the maximum simultaneous stop capacity.