JP2015176178A - total power suppression control apparatus and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress an inter-phase power consumption difference that may accidentally occur and improve an inter-phase balance of three-phase current, when suppressing the total sum of power usage by processing the upper limit of manipulated variables of multiple control loops assigned to any of three phases.SOLUTION: A group registry unit 26 registers the result of previously grouping a control loop i (i=1-n) of n pieces (n is an integer of 2 or more) assigned to any of R phase, S phase and T phase in multiple groups so as to improve a balance of mutual power consumption. A simultaneous change detection unit 27 detects a simultaneous change of a set value SPi to the control loop i. A set value operation unit 28 transmits the change of the set value SPi to the control loop i at different timing every group, when the simultaneous change of the set value SPi is detected.

Description

  The present invention relates to a control device and a control method of a multi-loop control system having a plurality of control loops, and in particular, in a steady state, the energy usage (for example, power usage) does not exceed a specified constant value, and The present invention relates to a power sum suppression control apparatus and method for performing control so that disturbance suppression characteristics are not impaired as much as possible.

  With the revision of the law caused by the global warming problem, there is a strong demand for energy usage management in factories and production lines. Since heating devices and air conditioners in factories are equipment devices that use a large amount of energy, they are often managed so that the upper limit of the amount of energy used is lower than the original maximum amount. For example, in an equipment device that uses electric power, an operation is performed in which the electric power is managed within a specific amount of electric power used by an instruction from the electric power demand management system.

  In particular, in a heating apparatus including a plurality of electric heaters, in order to suppress the total power simultaneously supplied at the time of start-up (at the time of simultaneous temperature increase in a region where a plurality of electric heaters are installed), Such a method has been proposed. In these methods, by operating the operation amount upper limit value (upper limit value of the operation amount MV) of the PID control calculation unit, the total power at the time of temperature rise due to the change of the set value can be suppressed to a specified value or less.

Specifically, in the method of Patent Document 1, the energy consumption value of each control loop i is obtained, the energy margin of each control loop i is calculated from the energy consumption value, and each control loop i with respect to the sum of the energy margins is calculated. By calculating the operation amount output upper limit value OHi of each control loop i based on the ratio of the energy margin and the allocated total energy, the operation amount output upper limit value OHi is set so that the energy margin of each control loop i approaches a fair state. Calculated.
Thereby, it is possible to control a plurality of control systems so that the amount of energy used does not exceed the allocated total energy in a steady state and the disturbance suppression characteristics are not impaired as much as possible.

  In the method of Patent Document 2, the control amount change time when the operation amount MVi of each control loop i is changed from the current value to a specific output value is estimated, and the control amount PVi of each control loop i is calculated as the control amount change time. The required output MUi, which is an operation amount required to change the amount corresponding to the change of the set value SPi during the period, is estimated, and the total used energy that is the sum of the used energy of each control actuator is calculated from the required output MUi. Then, a combination of necessary outputs MUi whose total used energy does not exceed the allocated total energy is searched, and the finally obtained necessary output MUi is set as an operation amount output upper limit value OHi for each control loop i.

  Thereby, with respect to a plurality of control systems, the amount of energy used in step response control (a state in which the step change of the set value SPi is performed and the control function is used to follow the set value SPi of the control amount PVi). Control can be performed so that the allocated total energy is not exceeded and the follow-up characteristic of the control amount PVi to the set value SPi is not impaired as much as possible.

JP 2012-048370 A JP 2012-048533 A JP2013-066631A

When operating the operation amount upper limit value OH of the PID control calculation unit, if the temperature control actuator is a single-phase electric heater, the balance between phases must be considered.
Here, the interphase balance is the balance that should be maintained on the power consumption side for the R phase, S phase, and T phase of the three-phase alternating current. As shown in Patent Document 3, countermeasures at the power converter level have been proposed, but when using a plurality of single-phase electric heaters, even if each phase is designed to be used in a balanced manner, When the operation amount upper limit value OH is operated, a balance that cannot be assumed in advance is obtained.

  For example, as an easy-to-understand form, 400 W and 300 W are included in the RS phase, ST phase, TR phase or R phase, S phase, T phase and neutral (hereinafter simply referred to as R phase, S phase, T phase, respectively). Assume a six-heater system in which single-phase electric heaters are assigned independently one by one. For all six heaters, if the manipulated variable MV for PID control is limited by the manipulated variable upper limit value OH = 100% MV = 100%, the power consumption state is 700 W for each of the R, S, and T phases (400W + 300W), which means that the balance between phases as designed is obtained.

  On the other hand, by manipulating the manipulated variable upper limit value OH, the manipulated variable upper limit value OH for the two R phases accidentally becomes 90%, and by chance, the manipulated variable upper limit value OH for the two S phases becomes 80%. If the upper limit value OH of the two T phases accidentally becomes 70%, which is lower, R phase 630W (360W + 270W = 630W with MV = 90%), S phase 560W (320W + 240W = 560W with MV = 80%) , T phase 490W (280W + 210W = 490W with MV = 70%). The ratio of the maximum difference is 630W / 490W = 1.29, which is a difference of about 1.3 times. Although it is a simple example to the last, it means that it can fall into an inappropriate state, and improvement is required.

  The present invention is to solve such a problem, and when the total amount of power consumption is suppressed by performing upper limit processing on the operation amount MVi of the control loop i, the power consumption disparity between the phases that may occur by chance. Power total suppression control technology that can improve the interphase balance of three-phase alternating current.

  In order to achieve such an object, the power sum suppression control apparatus according to the present invention includes n control loops i (n is an integer of 2 or more) assigned to any of the R phase, S phase, and T phase. (I = 1 to n), a group registration unit for registering a result of grouping in advance into a plurality of groups so as to improve the balance of power consumption with each other, and simultaneous detection of simultaneous change of the set value SPi for the control loop i A change detection unit; a set value operation unit that transmits a change of the set value SPi to the control loop i at a different timing for each group when a simultaneous change of the set value SPi is detected; and the control in the steady state. The operation amount output upper limit value OHi of each control loop i is calculated so that the total energy consumption amount in the control actuator of the loop i does not exceed the specified constant value. And a total electric power suppression control unit that performs limit processing of the operation amount MVi for the control actuator of the control loop i on the basis of the upper limit value OHi.

  Further, in one configuration example of the power sum suppression control device according to the present invention, the power sum suppression control unit calculates a power margin of each control loop i from the power consumption value CTi of each control loop i, and A power suppression unit that calculates an operation amount output upper limit value OHi of each control loop i based on the ratio of the power margin so that the power margin approaches a fair state, and provided for each control loop i, An operation amount MVi is calculated by a control calculation with the set value SPi and the control amount PVi as inputs, an upper limit process is performed to limit the operation amount MVi to the operation amount output upper limit value OHi or less, and the operation amount MVi after the upper limit process is calculated. A control unit that outputs to a control actuator of a corresponding control loop i, wherein the set value operation unit is a control that belongs to a preceding group that changes the set value SPi in advance of the group. The change of the set value SPi of the control loop i belonging to the delay group other than the preceding group is delayed for a time TX longer than the time during which the manipulated variable output upper limit value OHi of the loop i rises and stabilizes. Is.

  Further, in the configuration example of the power sum suppression control device according to the present invention, when the simultaneous change detection unit detects that the set value SPi for the control loop i is equal to or greater than a reference value RS, the simultaneous change detection unit It is determined that a change has been detected.

  Further, in the configuration example of the power sum suppression control device according to the present invention, the simultaneous change detection unit is switched from the READY mode in which the control by the control loop i is not in the operating state to the RUN mode in the operating state. When this is detected, it is determined that the simultaneous change has been detected.

  Also, in one configuration example of the power sum suppression control device according to the present invention, the power sum suppression control unit inputs an allocation total power PW that defines a power usage amount in a control actuator of each control loop i. A total power input unit; a power value input unit for inputting the power consumption value CTi of each control loop i; and a maximum output power value input unit for inputting the maximum output power consumption value CTmi of each control loop i; Based on the maximum output power consumption value CTmi and the power consumption value CTi, a power margin calculation unit that calculates a power margin CTri of each control loop i, and a maximum output power consumption value CTmi of each control loop i A maximum total power calculation unit that calculates the maximum total power BX that is the sum of the power margins, and a power margin total amount calculation unit that calculates the power margin total amount RW that is the sum of the power margins CTri of the respective control loops i. Based on the maximum total power BX and the allocated total power PW, a power reduction total amount calculation unit that calculates a power reduction total amount SW that is a total power amount to be reduced, the power margin CTri, the power margin total amount RW, and the Based on the total power reduction amount SW, a power reduction allocation amount calculation unit that calculates a power reduction allocation amount CTsi that is the amount of power to be reduced in each control loop i, the power reduction allocation amount CTsi and the maximum output consumption An output upper limit value calculation unit that calculates an operation amount output upper limit value OHi for each control loop i based on the power value CTmi is further provided.

  The power sum suppression control method according to the present invention includes n control loops i (i = 1 to n) assigned to any of the R phase, S phase, and T phase (n is an integer of 2 or more). A group registration step for registering the results of grouping in advance into a plurality of groups so as to improve the balance of power consumption, a simultaneous change detection step for detecting a simultaneous change of the set value SPi for the control loop i, and the set value When a simultaneous change of SPi is detected, a set value operation step of transmitting a change of the set value SPi to the control loop i at a different timing for each group; and energy in the control actuator of the control loop i in a steady state The operation amount output upper limit value OHi of each control loop i is calculated so that the total amount of use does not exceed the specified constant value, and this operation amount output upper limit value is calculated. And a total electric power suppression control step of performing a limit process of the operation amount MVi for the control actuator of the control loop i based on Hi.

  Also, in one configuration example of the power sum suppression control method according to the present invention, the power sum suppression control step calculates the power margin of each control loop i from the power consumption value CTi of each control loop i, A power suppression step for calculating an operation amount output upper limit value OHi of each control loop i based on the ratio of the power margin so that the power margin approaches a fair state, and provided for each control loop i, An operation amount MVi is calculated by a control calculation with the set value SPi and the control amount PVi as inputs, an upper limit process is performed to limit the operation amount MVi to the operation amount output upper limit value OHi or less, and the operation amount MVi after the upper limit process is calculated. A control step of outputting to a control actuator of a corresponding control loop i, wherein the set value operation step changes the set value SPi in advance of the group. The set value SPi of the control loop i belonging to the delay group other than the preceding group is changed for the time TX longer than the time during which the manipulated variable output upper limit value OHi of the control loop i belonging to the preceding group rises and stabilizes. It is designed to be delayed.

  Also, in one configuration example of the power sum suppression control method according to the present invention, when the simultaneous change detection step detects that the set value SPi for the control loop i is greater than or equal to a reference value RS, It is determined that a change has been detected.

  Also, in one configuration example of the power sum suppression control method according to the present invention, the simultaneous change detection step is switched from the READY mode in which the control by the control loop i is not in the operating state to the RUN mode in the operating state. When this is detected, it is determined that the simultaneous change has been detected.

  Also, in one configuration example of the above-described total power suppression control method according to the present invention, the total power suppression control step inputs an allocated total power PW that defines the amount of power used by the control actuator of each control loop i. A power input step; a power value input step for inputting a power consumption value CTi of each control loop i; a maximum output power value input step for inputting a maximum power consumption value CTmi of each control loop i; Based on the maximum output power consumption value CTmi and the power consumption value CTi, a power margin calculation step for calculating the power margin CTri of each control loop i, and the maximum output power consumption value CTmi of each control loop i A maximum total power calculating step for calculating a maximum total power BX that is a sum, and a power margin total amount R that is a sum of the power margin CTri of each control loop i. A power margin total amount calculating step for calculating a power reduction total amount calculating step for calculating a power reduction total amount SW that is a total power amount to be reduced based on the maximum total power BX and the allocated total power PW, and the power A power reduction allocation amount calculating step of calculating a power reduction allocation amount CTsi that is an amount of power to be reduced in each control loop i based on the margin CTri, the power margin total amount RW, and the power reduction total amount SW; An output upper limit value calculating step for calculating an operation amount output upper limit value OHi for each control loop i based on the reduction allocation amount CTsi and the maximum output power consumption value CTmi.

  According to the present invention, each control loop assigned to any one of the R phase, S phase, and T phase is grouped in advance in a plurality of groups so that the balance of power consumption between each group is improved. Since the set value of each control loop is changed at different timings, the number of control loops that are simultaneously subjected to power suppression can be reduced. Therefore, it is possible to maintain a state in which the difference in power consumption between phases that may occur by chance is difficult to increase, and as a result, the balance between phases can be improved.

It is a block diagram which shows the structure of the heating apparatus using the electric power total suppression control apparatus concerning 1st Embodiment. It is a block diagram which shows the structure of the electric power total suppression control apparatus concerning 1st Embodiment. It is a block diagram of the control system in an electric power total suppression control apparatus. It is a flowchart which shows the basic electric power total suppression control operation | movement concerning 1st Embodiment. It is a flowchart which shows the interphase balance improvement operation | movement concerning 1st Embodiment. It is explanatory drawing which shows the operation example of the heating apparatus concerning 1st Embodiment. It is a block diagram which shows the structure of the electric power total suppression control apparatus concerning 2nd Embodiment. It is a flowchart which shows the phase balance improvement operation | movement concerning 2nd Embodiment. It is a flowchart which shows the phase balance improvement operation | movement concerning 3rd Embodiment.

[Principle of the Invention]
First, the principle of the present invention will be described.
As a factor that the power consumption difference between each phase of R phase, S phase, and T phase becomes particularly large, for example, large power at the time of temperature rise in many temperature control systems is not distinguished between R phase, S phase, and T phase. Focused on unlimited adjustments. In other words, the disparity between control loops is likely to increase when a high power state is entered, and if there is no distinction between the R phase, S phase, and T phase in a large number of temperature control systems, the unbalance between the phases will increase by chance. There will be room for it. For example, a control system with a small power suppression degree is only the R phase, and conversely, a control system with a large power suppression degree is only the T phase.

  Therefore, a plurality of control systems of R phase, S phase, and T phase are previously grouped into a plurality of groups so that the balance of power consumption is improved. That is, each group is registered in advance so that a small number of control loops are gathered so that the total sum of the R phase, S phase, and T phase of the maximum power consumption approaches. Then, by shifting the timing of changing the set value SP (temperature increase) for each group, the number of control loops that are simultaneously subjected to power suppression can be reduced. Therefore, it was conceived that the power consumption disparity between phases that could occur accidentally can be maintained in a state where it is difficult to increase, thereby improving the balance between phases.

Next, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
First, with reference to FIG. 1, the electric power sum total suppression control apparatus 1 concerning the 1st Embodiment of this invention is demonstrated. FIG. 1 is a block diagram illustrating a configuration of a heating device using the power sum suppression control device according to the first embodiment.

  The heating apparatus 100 is heated by a heat treatment furnace 2 for heating an object to be heated, heaters H1 to H6 that are a plurality of control actuators installed in the heat treatment furnace 2, and heaters H1 to H6, respectively. A plurality of temperature sensors S <b> 1 to S <b> 6 that measure the temperature of the area to be output, the power sum suppression control device 1 that calculates the operation amounts MV <b> 1 to MV6 that are output to the heaters H <b> 1 to H <b> 6, and the operations that are output from the power sum suppression control device 1 It is comprised from the electric power regulators 31-36 which supply the electric power according to quantity MV1-MV6 to heater H1-H6, respectively. The host device PC is a device that instructs the total power suppression control device 1 for the total allocated power PW.

[Total power suppression control device]
Next, with reference to FIG. 2, the structure of the electric power total suppression control apparatus 1 concerning this Embodiment is demonstrated in detail. FIG. 2 is a block diagram illustrating a configuration of the power sum suppression control device according to the first embodiment.
Here, in order to simplify the description, two R-phase, S-phase, and T-phase electric heaters are used, and each is used as an actuator in six separate PID control loops. Further, the six PID control loops are premised on that the set value SP is changed at the same time and the temperature rise is started at the same time.

-Electric heater (actuator) control system R phase: control loop 1 (heater H1: 400W), control loop 2 (heater H2: 300W)
S phase: Control loop 3 (heater H3: 400W), control loop 4 (heater H4: 300W)
T phase: Control loop 5 (heater H5: 400W), control loop 6 (heater H6: 300W)
・ Grouping group A: Control loop 1 (400W), control loop 3 (400W), control loop 5 (400W)
Group B: Control loop 2 (300W), control loop 4 (300W), control loop 6 (300W)

  The power sum suppression control device 1 includes an assigned total power input unit 11 that receives information on the assigned total power PW from the host device PC, and power that acquires the power consumption value CTi of each control loop i (i = 1 to 6). The value input unit 12, the maximum output power value input unit 13 for obtaining the maximum output power consumption value CTmi of each control loop i, and the maximum output power consumption value CTmi and the power consumption value CTi of each control loop i A power margin calculation unit 14 that calculates the power margin CTri and a maximum total power calculation unit 15 that calculates the maximum total power BX that is the sum of the maximum output power consumption values CTmi of each control loop i are provided.

  In addition to this, the power sum suppression control device 1 includes a power margin total calculation unit 16 that calculates a power margin total amount RW that is the sum of the power margins CTri of each control loop i, and a power that is a total power amount to be reduced. A power reduction total amount calculation unit 17 that calculates the total reduction amount SW from the maximum total power BX and the total allocation power PW, and a power reduction allocation amount calculation that calculates a power reduction allocation amount CTsi that is a power amount to be reduced in each control loop i Unit 18, an output upper limit value calculation unit 19 that calculates an operation amount output upper limit value OHi of each control loop i from the power reduction allocation amount CTsi and the maximum power consumption value CTmi, and a control provided for each control loop i Part 20i.

Maximum output power value input unit 13, power margin calculation unit 14, maximum total power calculation unit 15, power margin total amount calculation unit 16, power reduction total amount calculation unit 17, power reduction allocation amount calculation unit 18, and output upper limit value calculation unit 19 Constitutes a power suppression means.
The control unit 20i includes a set value input unit 21i, a control amount input unit 22i, a PID control calculation unit 23i, an output upper limit processing unit 24i, and an operation amount output unit 25i.

  Further, the power sum suppression control device 1 includes a plurality of control systems assigned to any one of the R phase, the S phase, and the T phase so that each control loop i is divided into a plurality of groups so that the balance of power consumption is improved. In this example, the group registration unit 26 that groups each of the group A (preceding group) that does not hold the change of the set value SPi and the group B (delay group) that holds only the waiting time TX, and the setting of each control loop i When the simultaneous change of the value SPi is performed, the simultaneous change detection unit 27 that detects this and notifies the set value operation unit 28 and the control loop i of the group A registered in the group registration unit 26 are changed. The set value SPi is immediately transmitted, and for the control loop i of the group B, the transmission of the changed set value SPi is time TX from the transmission timing of the group A. A setting value operation unit 28 to delay is provided.

  FIG. 3 is a block diagram of a control system in the power sum suppression control device. Each control loop i includes a control unit 20i and a control object Pi. As will be described later, the control unit 20i calculates an operation amount MVi from the set value SPi and the control amount PVi, and outputs the operation amount MVi to the control target Pi. In the example of FIG. 1, the control object Pi is the heat treatment furnace 2 heated by the heater Hi, but the actual output destination of the operation amount MVi is the power regulator 3i, and the power corresponding to the operation amount MVi is the power regulator. 3i is supplied to the heater Hi.

[Operation of First Embodiment]
Next, a basic power sum suppression control operation of the power sum suppression control device 1 according to the present embodiment will be described with reference to FIG. FIG. 4 is a flowchart showing a basic power sum suppression control operation according to the first embodiment.

  First, the total allocated power input unit 11 inputs information on the total allocated power PW that defines the power usage of the heater from the host apparatus PC that is a computer of the power demand management system that manages power (step S100 in FIG. 4). .

  Subsequently, the power value input unit 12 inputs the current power consumption value CTi (specifically, the power consumption value of the heater Hi) of each control loop i (step S101). The power value input unit 12 may measure or estimate the power consumption value CTi. In order to estimate the power consumption value CTi, the power consumption value CTi may be obtained by a preset power estimation function equation using the current value flowing through the heater Hi and the control amount PVi as input variables. Further, the operation amount MVi and the control amount PVi may be input variables, and the current value flowing through the heater Hi, the control amount PVi, and the operation amount MVi may be input variables. Since the specific estimation method of the power consumption value CTi is disclosed in Japanese Patent Application Laid-Open No. 2009-229382, detailed description thereof is omitted.

Next, the maximum output power value input unit 13 inputs the maximum output power consumption value CTmi of each control loop i (step S102). Here, the time of maximum output means that the manipulated variable MVi is the maximum value of 100%. The maximum output power value input unit 13 may extract or estimate the maximum output power consumption value CTmi stored in advance. In order to estimate the maximum power consumption value CTmi at the time of output, it may be estimated approximately by the following equation based on the power consumption value CTi and the operation amount MVi output from the control unit 20i.
CTmi = CTi (100.0 / MVi) (1)

Thereafter, the power margin calculation unit 14 calculates the power margin CTri of each control loop i for each control loop i using the following equation (step S103).
CTri = CTmi-CTi (2)
Further, the maximum total power calculation unit 15 calculates the maximum total power BX, which is the sum of the maximum output power consumption values CTmi of each control loop i, by the following equation (step S104).
BX = ΣCTmi = CTm1 + CTm2 +... + CTmn (3)

Subsequently, the power margin total amount calculation unit 16 calculates a power margin total amount RW that is the sum of the power margin CTri of each control loop i by the following equation (step S105).
RW = ΣCTri = CTr1 + CTr2 +... + CTrn (4)
Further, the total power reduction amount calculation unit 17 calculates the total power reduction amount SW, which is the total power amount to be reduced, from the maximum total power BX and the allocated total power PW according to the following equation (step S106).
SW = BX-PW (5)

Thereafter, the power reduction allocation amount calculation unit 18 calculates the power reduction allocation amount CTsi, which is the amount of power to be reduced in each control loop i, for each control loop i by the following equation (step S107).
CTsi = SW (CTri / RW) (6)
Subsequently, the output upper limit value calculation unit 19 calculates an operation amount output upper limit value OHi of each control loop i for each control loop i by the following equation from the power reduction allocation amount CTsi and the maximum power consumption value CTmi (step) S108).
OHi = {1.0− (CTsi / CTmi)} 100.0 [%] (7)
When BX <PW, that is, when SW <0, the manipulated variable output upper limit value OHi exceeds 100%. In this case, the manipulated variable output upper limit value OHi may be cut at 100%.

Next, the control unit 20i calculates the operation amount MVi of the control loop i as follows.
First, the set value SPi is set by the user of the heating device and is input to the PID control calculation unit 23i through the set value input unit 21i (step S109).
Further, the control amount PVi (temperature) is measured by the temperature sensor Si and input to the PID control calculation unit 23i via the control amount input unit 22i (step S110).

Thereafter, the PID control calculation unit 23i calculates a manipulated variable MVi by performing a PID control calculation such as the following transfer function equation based on the set value SPi and the control amount PVi (step S111).
MVi = (100 / PBi) {1+ (1 / TIis) + TDis} (SPi−PVi)
... (8)
PBi is a proportional band, TIi is an integration time, TDi is a differentiation time, and s is a Laplace operator.

Subsequently, the output upper limit processing unit 24i performs an upper limit process for the operation amount MVi as in the following equation (step S112).
IF MVi> OHi THEN MVi = OHi (9)
That is, the output upper limit processing unit 24i performs an upper limit process for setting the operation amount MVi = OHi when the operation amount MVi is larger than the operation amount output upper limit value OHi.

Thereafter, the operation amount output unit 25i outputs the operation amount MVi subjected to the upper limit processing by the output upper limit processing unit 24i to the control target (the actual output destination is the power adjuster 3i) (step S113). Since the control unit 20i is provided for each control loop i, the processes in steps S109 to S113 are performed for each control loop i.
The power sum suppression control device 1 performs the processes in steps S101 to S113 as described above at regular intervals until the control is terminated by, for example, a user instruction (step S114: YES).

Here, the control loop i (i = 1, 3, 5) of the temperature increase target is repeated by continuing the above operation repeatedly only for the control loop i (i = 1, 3, 5) of the group A. Output amount MVi (i = 1, 3, 5) increases, and the output upper limit value OHi (i = 1, 3, 5) also increases until the total power reaches the allocated total power PW.
Further, the output upper limit value OHi (i = 2, 4, 6) of the control loop i (i = 2, 4, 6) of the group B that is once out of the temperature increase target is simultaneously changed with the set value SPi. It approaches (descends) the previous operation amount MVi (i = 2, 4, 6).

  Therefore, if stable in this state, the power consumption disparity (unbalance) between the phases that may occur by chance remains only in the control loop i (i = 1, 3, 5) of the group A. In other words, the generation range of the disparity is limited, and the power distribution is concentrated in the group A. Therefore, it is difficult to generate a control loop in which the power is suppressed at the temperature rise, and the disparity within the group A is difficult to increase.

  Further, the output upper limit value OHi (i = 2, 4, 6) of the control loop i (i = 2, 4, 6) of the group B is uniformly changed to a small value as a result of the above. Therefore, even if the temperature increase of the control loop i (i = 2, 4, 6) of the group B starts at this time, the disparity within the group B is hardly increased.

  Next, with reference to FIG. 5, the phase balance improving operation in the power sum suppression control apparatus according to the present embodiment will be described. FIG. 5 is a flowchart showing the interphase balance improving operation according to the first embodiment.

  First, the group registration unit 26 sets the R phase, S phase, and T phase control systems so that the balance of power consumption is improved, that is, in each group, the maximum power consumption R phase and S phase. , Each control loop i is held in a plurality of groups, in this example, the group A that does not hold the change of the set value SPi and the waiting time TX, so that a small number of control loops are gathered so that each sum of the T phases approaches. Each of the groups B to be grouped is grouped (step S120). Here, among the control loops i (i = 1 to 6), the control loop i (i = 1, 3, 5) is grouped into the group A, and the control loop i (i = 2, 4, 6) is grouped. Grouped into B.

Subsequently, the simultaneous change detection unit 27 monitors whether or not the set value SPi of each control loop i (i = 1 to 6) has been changed simultaneously (step S121), and the set value SPi is changed simultaneously. In the case of a change (step S121: YES), the set value operation unit 28 is notified.
In response to this notification, the set value operation unit 28 immediately transmits the changed set value SP for the control loop i (i = 1, 3, 5) of the group A registered in the group registration unit 26 (step S1). S122) For the control loop i (i = 2, 4, 6) of group B, transmission of the changed setting value SPi is suspended and the setting value SPi before the change is maintained as it is (step S123).

  Thereafter, the simultaneous change detection unit 27 maintains the setting value SPi before the change, and after the waiting time TX has elapsed, the setting changed for the control loop i (i = 2, 4, 6) of the group B. The value SPi is transmitted (step S124). As a result, the change of the set value SPi for the control loop i (i = 2, 4, 6) of the group B is delayed as compared with the group A, and the number of control loops that are simultaneously subjected to power suppression is reduced.

For this reason, the state in which the power consumption difference between the phases that may occur by chance is hardly increased is maintained, and the balance between the R phase, the S phase, and the T phase is improved. Note that the time TX only needs to have a length longer than the time during which the manipulated variable output upper limit value OHi of the control loop i belonging to the group A that changes the set value SPi in advance increases and stabilizes. It becomes irrelevant to time having a large degree of condition dependence such as the estimated temperature time, and the setting becomes easy.
The power sum suppression control device 1 repeatedly performs the processes in steps S120 to S124 as described above until, for example, the control is terminated by a user instruction (step S125: YES).

  FIG. 6 is an explanatory diagram illustrating an operation example of the heating device according to the first embodiment. Here, temporal changes of the set value SPi, the control amount PVi, the operation amount output upper limit value OHi, and the operation amount MVi for each control group i (i = 1 to 6) are shown. As described above, among the control loops i (i = 1 to 6), the control loop i (i = 1, 3, 5) is grouped into the group A and the control loop i (i = 2, 4, 4). 6) is grouped into group B.

  As shown in FIG. 6, power distribution is concentrated in group A until the temperature increase of control loop i (i = 1, 3, 5) of group A is completed, but as the completion of the temperature increase approaches, The manipulated variable MVi (i = 1, 3, 5) gradually decreases, and the output upper limit value OHi (i = 1, 3, 5) also decreases. In other words, the state of power distribution concentrated in the group A is relaxed, and the temperature substantially shifts to the temperature increase of the control loop i (i = 2, 4, 6) of the group B.

  In this case, the power consumption disparity (unbalance) between the phases that may occur by chance remains only in the control loop i (i = 2, 4, 6) of the group B. That is, the generation range of the disparity is limited, and the power distribution is concentrated in the group B. Therefore, it is difficult to generate a control loop in which the power is suppressed at the temperature rise, and the disparity within the group B is difficult to increase.

  As described above, a plurality of control systems for the R phase, the S phase, and the T phase are used for the power sum suppression control of the type that operates the output upper limit value OH such as JP2012-048370A and JP2012-048533A. By applying a configuration in which a plurality of groups are grouped to improve the balance of power consumption and the timing of changing the set value SPi (temperature increase) is shifted for each group, the balance between phases can be improved.

For example, in the case of the above-described embodiment, the maximum power consumption state 2100W does not cause a difference as described below.
・ R phase: Control loop 1 (heater 400W), control loop 2 (heater 300W) Total 700W
-S phase: Control loop 3 (heater 400W), control loop 4 (heater 300W) Total 700W
・ T phase: Control loop 5 (heater 400W), control loop 6 (heater 300W) Total 700W

Assume that when the six PID control loops are heated from the initial state of 0 W, the allocated total power PW is 1155 W, which is 55% of the maximum power. If grouping is not taken into consideration (conventional method), the following power consumption state (ratio: 578 W / 192 W = 3.0) can also theoretically occur (theoretically there are more).
・ R phase: Control loop 1 (heater 110W), control loop 2 (heater 82W) Total 192W
-S phase: Control loop 3 (heater 220W), control loop 4 (heater 165W) Total 385W
-Phase T: Control loop 5 (heater 330W), control loop 6 (heater 248W) Total 578W

In the present invention, the theoretical maximum disparity power consumption state (ratio: 400W / 355W = 1.13) within the group is not exceeded.
・ R phase: Control loop 1 (heater 355W), control loop 2 (heater 0W) Total 355W
・ S phase: Control loop 3 (heater 400W), control loop 4 (heater 0W) Total 400W
・ T phase: Control loop 5 (heater 400W), control loop 6 (heater 0W) Total 400W

Then, even if the temperature increase of the control loop i (i = 1, 3, 5) of the group A is completed and the temperature control of the control loop i (i = 2, 4, 6) of the group B is substantially shifted, Then, the following power consumption state (ratio: 350 W / 350 W = 1.0) is settled.
・ R phase: Control loop 1 (heater 50W), control loop 2 (heater 300W) Total 350W
・ S phase: Control loop 3 (heater 50W), control loop 4 (heater 300W) Total 350W
・ T phase: Control loop 5 (heater 50W), control loop 6 (heater 300W) Total 350W

In the above description, fictitious numerical values have been set to facilitate understanding of the operation and effects of the present invention. However, in practice, grouping restrictions may occur depending on the number of heaters and some design circumstances, and the balance between phases may be The extent to which the disparity can be improved varies from case to case. However, in any case, if there are a plurality of R-phase, S-phase, and T-phase heaters, the difference in the balance between phases is greater when the present invention is applied than when the present invention is not applied. Expansion can be suppressed.
In addition, also when applying the total power suppression control unit (power suppression unit) described in Japanese Patent Application Laid-Open No. 2012-048533 to the present embodiment, the interphase balance improvement function may be applied in the same manner. I will omit the explanation.

[Effect of the first embodiment]
As described above, in the present embodiment, the group registration unit 26 assigns n (n is an integer of 2 or more) control loops i (i = 1 to 2) assigned to any of the R phase, the S phase, and the T phase. n) is registered in advance into a plurality of groups so as to improve the balance of power consumption, and the simultaneous change detection unit 27 detects the simultaneous change of the set value SPi for the control loop i, and performs the set value operation. When the simultaneous change of the set value SPi is detected, the unit 28 transmits the change of the set value SPi to the control loop i at a different timing for each group.

  As a result, each control loop i assigned to one of the R phase, S phase, and T phase is grouped in advance in a plurality of groups so as to improve the balance of power consumption with each other, and is different for each group. Since the set value SPi of each control loop i is changed at the timing, the number of control loops that are simultaneously subjected to power suppression can be reduced. Therefore, when the total amount of power consumption is suppressed by performing upper limit processing on the operation amount MVi of the control loop i, it is possible to maintain a state in which the power consumption disparity between the phases that may occur by chance is unlikely to increase. It becomes possible to improve the balance between phases.

  In the present embodiment, the case where each control loop i is grouped into two groups, that is, the group A that changes the set value SPi in advance and the group B that changes the set value SPi after delay has been described as an example. The control loop i may be grouped by providing three or more groups that change the set value SPi at different timings.

[Second Embodiment]
Next, with reference to FIG. 7, the structure of the electric power total suppression control apparatus 1 concerning the 2nd Embodiment of this invention is demonstrated in detail. FIG. 7 is a block diagram illustrating a configuration of the power sum suppression control device according to the second embodiment.

In this embodiment, the group registration unit 26, the simultaneous change detection unit 27, and the set value operation unit 28 in the first embodiment are used as a group registration unit 26i, a simultaneous change detection unit 27i, and a set value operation unit 28i. By mounting on the part 20i, it is a modified form as a practical mounting method.
As the simultaneous change of the set value SPi, there are many cases where only a special large simultaneous temperature increase is assumed as in the apparatus startup. Further, as divided into group A and group B in the first embodiment, it is practical and sufficient to divide into two groups in many cases. In the present embodiment, such an apparatus will be applied, and a mode in which the change width of the set value SPi is used as a determination index for simultaneous temperature rise will be described.

[Operation of Second Embodiment]
Next, with reference to FIG. 8, the phase balance improving operation in the power sum suppression control device according to the present embodiment will be described. FIG. 8 is a flowchart showing the interphase balance improving operation according to the second embodiment.
Note that the basic power sum suppression control operation of the power sum suppression control device 1 according to the present embodiment is the same as the content described with reference to FIG. 4, and a description thereof is omitted here.

  First, the group registration unit 26i groups its own control loop i into either the group A that does not hold the change of the set value SPi or the group B that holds the waiting time TX (step S200). For these groups A and B, the control systems of the R phase, S phase, and T phase are arranged so that the balance of power consumption is improved, that is, within each group, the R phase and S phase with the maximum power consumption. , The control loops i are grouped in advance in groups A and B so that a small number of control loops are gathered so that the sum of the T phases approaches. Here, among the control loops i (i = 1 to 6), the control loop i (i = 1, 3, 5) is grouped into the group A, and the control loop i (i = 2, 4, 6) is grouped. Grouped into B.

  Subsequently, the simultaneous change detection unit 27i determines whether or not the change width ΔSPi of the set value SPi of its own control loop i (i = 1 to 6) is greater than or equal to the reference value RS (ΔSPi ≧ RS) (step S1). S201) If the change width ΔSPi is equal to or greater than the reference value RS (step S201: YES), it is assumed that a simultaneous change of the set value SPi has been detected, and the set value operation unit 28i is notified.

In response to this notification, the set value operation unit 28i confirms whether or not its own control loop i is grouped in the group A based on the registration contents of the group registration unit 26i (step S202). The set value SPi is immediately transmitted (step S203).
On the other hand, in the case of group B, transmission of the changed setting value SPi is suspended and the setting value SPi before the change is maintained as it is (step S204).

Thereafter, the simultaneous change detection unit 27i transmits the changed setting value SPi after the waiting time TX has elapsed while maintaining the setting value SPi before the change (step S205). As a result, a state in which the difference in power consumption between the phases that can occur by chance is difficult to increase is maintained, and the balance between the R phase, the S phase, and the T phase is improved. Note that the time TX is irrelevant to a time having a large degree of condition dependency such as a scheduled temperature increase time, and is easy to set.
The power sum suppression control device 1 repeatedly performs the processes in steps S200 to S205 as described above until the control is terminated by, for example, a user instruction (step S206: YES).

[Effect of the second embodiment]
As described above, according to the present embodiment, the interphase balance improvement function can be realized by only the independent components between the control loops (such as the sharing unit) by the above configuration and processing flow. No longer in form). Thereby, the change of the set value SPi can be realized in a form that each control loop manages independently, and the interphase balance improvement function can be implemented in a single loop controller such as a temperature controller.

[Third Embodiment]
Next, the configuration of the power sum suppression control device 1 according to the third embodiment of the present invention will be described in detail.
In the present embodiment, similarly to the second embodiment, the group registration unit 26i, the simultaneous change detection unit 27i, and the set value operation unit 28i in the first embodiment are mounted on each control unit 20i. This is a modified form as a practical mounting method.

In the above-described second embodiment, the case where the change width of the set value SPi is used as a determination index for simultaneous temperature increase has been described as an example. However, considering the start-up of the device as a representative case of special large simultaneous temperature rise, the operation to switch from the READY mode in which the temperature control itself is not in the operating state to the RUN mode in the operating state is characteristic of the device starting. It should be noted that there are many cases where the operation is a complicated operation.
In this embodiment, a case in which switching from the READY mode to the RUN mode is used as a determination index for simultaneous temperature rise will be described with such a case as an application target.

[Operation of Third Embodiment]
Next, with reference to FIG. 9, the phase balance improving operation in the power sum suppression control apparatus according to the present embodiment will be described. FIG. 9 is a flowchart showing an interphase balance improving operation according to the third embodiment.
Note that the basic power sum suppression control operation of the power sum suppression control device 1 according to the present embodiment is the same as the content described with reference to FIG. 4, and a description thereof is omitted here.

  First, the group registration unit 26i groups its own control loop i into either the group A that does not hold the change of the set value SPi or the group B that holds the waiting time TX (step S300). For these groups A and B, the control systems of the R phase, S phase, and T phase are arranged so that the balance of power consumption is improved, that is, within each group, the R phase and S phase with the maximum power consumption. , The control loops i are grouped in advance in groups A and B so that a small number of control loops are gathered so that the sum of the T phases approaches. Here, among the control loops i (i = 1 to 6), the control loop i (i = 1, 3, 5) is grouped into the group A, and the control loop i (i = 2, 4, 6) is grouped. Grouped into B.

  Subsequently, the simultaneous change detection unit 27i determines whether or not the activation of the temperature control operation of its own control loop i (i = 1 to 6) has been performed as switching from the READY mode to the RUN mode (step S301). ), When switching from the READY mode to the RUN mode is performed (step S301: YES), it is considered that the simultaneous change of the set value SPi has been detected, and is notified to the set value operating unit 28i.

In response to this notification, the set value operation unit 28i confirms whether or not its own control loop i is grouped in the group A based on the registration contents of the group registration unit 26i (step S302). In the case of the group A (step S302: YES), the changed set value SPi is immediately transmitted (step S303).
On the other hand, in the case of group B (step S302: NO), the transmission of the changed setting value SPi is suspended and the setting value SPi before the change is maintained as it is (step S304).

Thereafter, the simultaneous change detection unit 27i transmits the changed setting value SPi after the waiting time TX has elapsed while maintaining the setting value SPi before the change (step S305). As a result, a state in which the difference in power consumption between the phases that can occur by chance is difficult to increase is maintained, and the balance between the R phase, the S phase, and the T phase is improved.
The power sum suppression control device 1 repeatedly performs the processes in steps S300 to S305 as described above until the control is terminated by, for example, a user instruction (step S306: YES).

[Effect of the third embodiment]
Thus, according to the present embodiment, the interphase balance improvement function is realized by only the independent components between the control loops, as in the second embodiment, by the above configuration and processing flow. Becomes possible (not in the form of a shared part). Thereby, the change of the set value SP can be realized in a form that each control loop manages independently, and the interphase balance improvement function can be implemented in a single loop controller such as a temperature controller.

[Extended embodiment]
The present invention has been described above with reference to the embodiments, but the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention. In addition, each embodiment can be implemented in any combination within a consistent range.

  DESCRIPTION OF SYMBOLS 1 ... Power total suppression control apparatus, 10 ... Power total suppression control part, 11 ... Allocation total power input part, 12 ... Power value input part, 13 ... Maximum output power value input part, 14 ... Power margin calculation part, 15 ... Maximum total power calculation unit, 16 ... power margin total amount calculation unit, 17 ... power reduction total amount calculation unit, 18 ... power reduction allocation amount calculation unit, 19 ... output upper limit value calculation unit, 20i ... control unit, 21i ... set value input unit , 22i ... control amount input unit, 23i ... PID control calculation unit, 24i ... output upper limit processing unit, 25i ... operation amount output unit, 26, 26i ... group registration unit, 27, 27i ... simultaneous change detection unit, 28, 28i ... Setting value operation unit, PW: total allocated power, CTi: power consumption value, CTmi: power consumption value at maximum output, CTri: power margin, BX: maximum total power, RW: total power margin, SW: total power reduction, CTsi ... Electric power reduction allocation , OHi ... manipulated variable output upper limit value, SPi ... setting value, PVi ... control amount MVi ... operation amount, 2 ... heat treatment furnace, 31～36,3I ... power regulator, 100 ... heating device, PC ... host device.

Claims (10)

A plurality of n (n is an integer of 2 or more) control loops i (i = 1 to n) assigned to any one of the R phase, the S phase, and the T phase are arranged so as to have a good balance of power consumption. A group registration unit for registering the results of grouping in advance into a group;
A simultaneous change detection unit for detecting a simultaneous change of the set value SPi for the control loop i;
A set value operation unit that transmits a change in the set value SPi to the control loop i at a different timing for each group when a simultaneous change in the set value SPi is detected;
In a steady state, an operation amount output upper limit value OHi for each control loop i is calculated so that the total amount of energy used by the control actuators of the control loop i does not exceed a specified constant value. A power sum suppression control device, comprising: a power sum suppression control unit that performs upper limit processing of the operation amount MVi for the control actuator of each control loop i based on the value OHi. In the electric power sum total suppression control device according to claim 1,
The power sum suppression control unit
The power margin of each control loop i is calculated from the power consumption value CTi of each control loop i, and the operation of each control loop i is performed based on the ratio of the power margin so that the power margin approaches a fair state. A power suppression unit for calculating a quantity output upper limit value OHi;
Provided for each control loop i, the set value SPi and the control amount PVi are input, the operation amount MVi is calculated by the control calculation, and the upper limit process for limiting the operation amount MVi to the operation amount output upper limit value OHi or less is executed. And a control unit that outputs the manipulated variable MVi after the upper limit process to the control actuator of the corresponding control loop i,
The set value operation unit is set to the group only for a time TX longer than a time during which the operation amount output upper limit value OHi of the control loop i belonging to the preceding group that changes the set value SPi in advance is stabilized. A change in the set value SPi of the control loop i belonging to a delay group other than the preceding group is delayed. In the electric power total suppression control apparatus of Claim 1 or Claim 2,
The simultaneous change detection unit determines that the simultaneous change has been detected when detecting that the set value SPi for the control loop i is equal to or greater than a reference value RS. In the electric power total suppression control apparatus of Claim 1 or Claim 2,
The simultaneous change detection unit determines that the simultaneous change has been detected when detecting that the control by the control loop i is switched from the READY mode that is not in the operating state to the RUN mode that is in the operating state. A power sum suppression control device. In the electric power total suppression control apparatus as described in any one of Claims 2-4,
The power sum suppression control unit
An allotted total power input unit that inputs a total allocated power PW that defines the amount of power used by the control actuator of each control loop i;
A power value input unit for inputting the power consumption value CTi of each control loop i;
A maximum output power value input unit for inputting the maximum output power consumption value CTmi of each control loop i;
A power margin calculation unit that calculates a power margin CTri of each control loop i based on the maximum power consumption value CTmi and the power consumption value CTi;
A maximum total power calculator that calculates a maximum total power BX that is the sum of the maximum output power consumption values CTmi of the control loops i;
A power margin total amount calculation unit that calculates a power margin total amount RW that is the sum of the power margin CTri of each control loop i;
A power reduction total amount calculation unit that calculates a power reduction total amount SW that is a total power amount to be reduced based on the maximum total power BX and the allocated total power PW;
A power reduction allocation amount calculation unit that calculates a power reduction allocation amount CTsi that is an amount of power to be reduced in each control loop i based on the power margin CTri, the power margin total amount RW, and the power reduction total amount SW;
An output upper limit value calculating unit that calculates an operation amount output upper limit value OHi of each control loop i based on the power reduction allocation amount CTsi and the maximum power consumption value CTmi at the time of the maximum output. Sum suppression control device. A plurality of n (n is an integer of 2 or more) control loops i (i = 1 to n) assigned to any one of the R phase, the S phase, and the T phase are arranged so as to have a good balance of power consumption. A group registration step of registering the results of grouping in advance into a group;
A simultaneous change detection step of detecting a simultaneous change of the set value SPi for the control loop i;
A set value operation step of transmitting a change of the set value SPi to the control loop i at a different timing for each group when a simultaneous change of the set value SPi is detected;
In a steady state, an operation amount output upper limit value OHi for each control loop i is calculated so that the total amount of energy used by the control actuators of the control loop i does not exceed a specified constant value. A power sum suppression control method, comprising: a power sum suppression control step of performing an upper limit process of the operation amount MVi for the control actuator of each control loop i based on the value OHi. In the electric power sum total suppression control method according to claim 6,
The power sum suppression control step includes:
The power margin of each control loop i is calculated from the power consumption value CTi of each control loop i, and the operation of each control loop i is performed based on the ratio of the power margin so that the power margin approaches a fair state. A power suppression step of calculating a quantity output upper limit value OHi;
Provided for each control loop i, the set value SPi and the control amount PVi are input, the operation amount MVi is calculated by the control calculation, and the upper limit process for limiting the operation amount MVi to the operation amount output upper limit value OHi or less is executed. And a control step for outputting the manipulated variable MVi after the upper limit processing to the control actuator of the corresponding control loop i,
The set value operation step includes the group for a time TX longer than a time during which the operation amount output upper limit value OHi of the control loop i belonging to the preceding group that changes the set value SPi in advance is stabilized after rising. A change in the set value SPi of the control loop i belonging to a delay group other than the preceding group is delayed. In the electric power sum total suppression control method of Claim 6 or Claim 7,
The power change suppression control method characterized in that the simultaneous change detection step determines that the simultaneous change has been detected when it is detected that a set value SPi for the control loop i is equal to or greater than a reference value RS. In the electric power sum total suppression control method of Claim 6 or Claim 7,
The simultaneous change detection step determines that the simultaneous change has been detected when it is detected that the control by the control loop i is switched from the READY mode that is not in operation to the RUN mode that is in operation. A power sum suppression control method. In the electric power sum total suppression control method according to any one of claims 7 to 9,
The power sum suppression control step is
An allocated total power input step of inputting an allocated total power PW that defines the amount of power used by the control actuator of each control loop i;
A power value input step of inputting the power consumption value CTi of each control loop i;
A maximum output power value input step for inputting a maximum output power consumption value CTmi of each control loop i;
A power margin calculating step of calculating a power margin CTri of each control loop i based on the maximum output power consumption value CTmi and the power consumption value CTi;
A maximum total power calculating step of calculating a maximum total power BX that is the sum of the maximum output power consumption values CTmi of the control loops i;
A power margin total amount calculating step for calculating a power margin total amount RW that is the sum of the power margin CTri of each control loop i;
A power reduction total amount calculating step of calculating a power reduction total amount SW which is a total power amount to be reduced based on the maximum total power BX and the allocated total power PW;
A power reduction allocation amount calculating step of calculating a power reduction allocation amount CTsi that is a power amount to be reduced in each control loop i based on the power margin CTri, the power margin total amount RW, and the power reduction total amount SW;
An output upper limit value calculating step of calculating an operation amount output upper limit value OHi for each control loop i based on the power reduction allocation amount CTsi and the maximum power consumption value CTmi at the time of maximum output. Sum suppression control method.

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