JP2002320327A - Selective load breaking/closing device and method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a selective load breaking/closing device wherein selective breaking of a load is so performed that all loads are not stopped by decrease of a supply voltage and consumption electric energy of the whole load is restrained within a range of supplying electric energy. SOLUTION: This selective load breaking/closing device is provided with an interface 14, an input and output means 12, a supply amount storing means 15, a load condition storing means 16, a level of importance storing means 17, and a breaking/closing selection means 13. The supply amount storing means 15 accommodates information of electric energy which can be supplied by a plant 20. The load condition storing means 16 accommodates load consumption electric energy (or rated electric energy and drive/stop information). The level of importance storing means 17 accommodates consumption of electric energy which is applied during power supply to a load. The breaking/closing selection means 13 selects a load by which an energy to be applied to the whole load becomes maximum, as the optimum breaking/closing load.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a consumer having an in-house power generation facility (power generation plant) for supplying power to a load. TECHNICAL FIELD The present invention relates to a selective load interrupting / injecting apparatus and method in which the power consumption of the entire load is suppressed within the range of the supplied electric energy by selectively interrupting the circuit breaker of the load so as not to cause the problem.

[0002]

2. Description of the Related Art FIG.
6 is a flowchart showing a procedure for selecting a breaking load by a conventional selective load breaking device described in Japanese Patent Publication No. 600. Hereinafter, with reference to the explanatory diagram of FIG. 14 in conjunction with FIG. 13, a description will be given of a breaking load selecting operation by the conventional selective load breaking / closing device.

In FIG. 13, first, a cutoff amount X is calculated from the current power consumption of the entire load and the reduced supply power (step S1), and one load is selected from predetermined low priority loads. (Step S2).

Subsequently, the sum ΣFn of the power consumption (load amount) of the selected load is calculated, and it is determined whether or not the sum ΣFn of the power consumption is equal to or larger than the cutoff amount X (step S).
3). In step S3, ΣFn <X (that is,
If NO), the process returns to step S2, and ΔFn ≧
Until X (that is, YES) is determined, the load is sequentially selected to obtain a cutoff candidate.

If it is determined in step S3 that ΣFn ≧ X (ie, YES), then it is determined whether the sum ΣFn of the selected load amounts is equal to or less than the cutoff limit amount L that causes the generator (plant) to stop. Is determined (step S
4).

If it is determined in step S4 that ΣFn> L (that is, NO), one load that satisfies the conditions of ΣFn> X and the load amount Fx ≦ L is selected and deleted from the cutoff candidates ( Step S5).

At this time, in the load selection satisfying the condition of step S5, if the priority order of the load shedding as the candidate for the shedding is different, an alarm is generated (step S5).
6). Hereinafter, in step S5, the remaining interruption candidate load is determined as the interruption load at the time of system disconnection, and the load selection is completed (step S7).

On the other hand, in step S4, ΔFn ≦ L
If it is determined to be (YES), the process immediately proceeds to step S7, and the processing routine of FIG. 13 ends.

Here, in step S5, as shown in FIG. 14, for example, the plant and the power system are interconnected, and a total of 23
00 (= 500 + 600 + 400 + 200 + 100 + 2
(00 + 300) A case will be described in which the system is disconnected and 600 kW is reduced when power is being supplied.

First, assuming that the load G having the lowest importance is a candidate for interruption, the interruption amount is 300 kW and does not exceed 600 kW. Therefore, the load F having the second lowest importance is added to the candidate for interruption.

When the above processing is repeated, when the loads E, F, and G are selected, as shown by the circles in FIG.
The total amount of interruption is 600 kW, which is the amount necessary for reduction. If the total amount of cutoff at this time is equal to or less than the limit amount L that causes the plant to stop, the three loads E, F, and G are cut off.

However, even if the order of importance of the loads is as shown in FIG. 14, if there is no large difference in the importance of each load, it may be better to reduce the number of interrupted loads.

For example, in addition to selecting the three loads E, F, and G, even if only a single load B, two loads A, E, or two loads C, D are selected, Since the total amount of cutoff satisfies 600 kW, it may be better to cut off only a single load B in order to shorten the cutoff time as much as possible.

In some cases, it may be desirable to select two loads C and D having a low importance and a small number of loads to be interrupted.

[0015] However, the conventional selective load shedding / input device cannot meet such various load selection needs.

FIG. 15 shows, for example, Japanese Patent Application Laid-Open No. 11-81.
FIG. 9 is a block diagram showing another conventional device described in Japanese Patent Application Publication No. 915. In FIG. 15, the emergency processing device 1 constituting the load selection cutoff / input means includes an input / output unit 2, a processing unit 3, and an interface unit 4, and is connected to a plant 20 for private power generation.

The emergency processing device 1 includes an emergency signal Q1 and a power consumption input signal Q
4 and outputs a control signal Q2 for the plant 20 and an information signal Q3 for the user.

The input / output unit 2 in the emergency processing device 1 supplies power supplied from the plant 20 to a load (not shown) under the control of the processing unit 3. Further, the interface unit 4 is provided with an information signal Q necessary for the user.
3 is output to an external terminal (not shown).

The emergency processing device 1 outputs an emergency signal Q1 (indicating occurrence of an accident of the generator in the plant 20).
When the power supplied from the plant 20 is lower than the power consumption of the entire load at the time of input, the load is set so that the power consumption of the entire load (recognized from the power consumption input signal Q4) falls within the reduced power supply. Selectively cut off as few loads as possible from the one with the lowest priority indicating the importance of.

Hereinafter, referring to the explanatory diagram of FIG. 16, in the conventional device shown in FIG. 15, a total of 2600 (= 500 + 600 + 400 + 200 + 400) is applied to the seven loads A to G.
+ 200 + 300) kW, the output became 1900 kW due to a generator accident, and the shortage of 7
Consider the case of reducing 00 kW.

First, as described above, assuming that the load G having the lowest importance is a candidate for interruption, the interruption amount is 300 kW.
Since the power does not exceed 600 kW, the load F having the next lower importance is added to the candidate for interruption.

By repeating the above process, as shown by the circles in FIG. 16, when three loads E, F, and G are selected, the total amount of cutoff becomes 900 kW, and the 700 kW required for reduction is obtained. Beyond.

Even if the order of importance of the loads is as shown in FIG. 16, if there is no large difference in the importance of the four loads D to G, it may be better not to give priority to the priority. is there.

That is, as in the case of the other cutoff candidates 1 shown in FIG. 16, when the loads D, F, and G are selected, the total cutoff amount becomes 700 kW, and when the loads E, F, and G are selected. Less is needed. Further, when two loads E and G are selected, as in the other interruption candidate 2 shown in FIG. 16, the total interruption amount becomes 700 kW and the number of interruption loads is reduced.

When loading the load, the load is selected in descending order of importance so as to be within the power obtained by subtracting the power consumption of the entire load from the supply power after the restoration. However, if you always load them in order of importance,
When the power consumption of a load having a high degree of importance is large, the load may be overloaded due to a delay in input, or the plant may be overloaded due to the early input of the load.

Also, in actual operation, there is a case where the input is performed so as to be in a slightly overloaded state to promote the start of the generator in the plant 20. Since the total amount of power consumption is limited to be equal to or less than the supplied power amount, such load input cannot be executed.

[0027]

The conventional selective load shedding /
As described above, the charging device is, for example, disclosed in JP-A-2000-18.
In the case of the apparatus described in Japanese Patent No. 4600, there is a problem that it is not possible to respond to various load selection requests in consideration of the degree of importance and the cutoff time.

In the case of the apparatus described in Japanese Patent Application Laid-Open No. 11-81915, for example, loads are applied in order from the one with the highest importance. There is a problem that an overvoltage state of the load or an overload state of the plant may be caused.

The present invention has been made in order to solve the above-described problems. In a customer who has a plant facility for private power generation, when the power system is disconnected, all loads are reduced due to a decrease in supply voltage. It is an object of the present invention to provide a selective load interrupting / injecting device and method in which the power consumption of the entire load is suppressed within a range of the supplied electric energy by selectively interrupting a load circuit breaker so as not to stop. I do.

Further, according to the present invention, when the plant for private power generation is started and the supply source to the load is switched from the system to the private power generation, each of the shut-offs is prevented so that the plant equipment is not overloaded and does not stop. It is an object of the present invention to obtain a selective load interrupting / inputting device and method for executing selective interrupting / inputting of a load by deriving the opening / closing of a vessel by an optimization problem.

[0031]

According to a first aspect of the present invention, there is provided a selective load interrupting / injecting device which is connected to a plant for private power generation and a plurality of loads for selectively interrupting / injecting the load. In the load shedding / input device, an interface unit connected to an external terminal operated by a user, input / output means connected to the plant, load and interface unit, supply amount storage means connected to the input / output means, and load State supply means and importance storage means; supply amount storage means, load state storage means and cutoff / input load selection means connected to the importance storage means, and the supply amount storage means receives input / output means from the plant. The load state storage means stores the power amount information received via the interface unit and the input / output means from the external terminal. Expenses amount of power, or to store the rated electric energy and the operation / stop information of the load, the importance storage unit,
The score given during the power supply to each load is stored as importance, and the cutoff / input load selection means is configured to satisfy the condition in the supply amount storage means based on the cutoff / input amount and importance of each load. In addition to selecting a cutoff / input load candidate, a cutoff / input load candidate having the highest score given to the entire load among the selected cutoff / input load candidates is selected as an optimum cutoff / input load.

Further, in the selective load interrupting / injecting device according to claim 2 of the present invention, in the claim 1, the importance is the ratio of the operation time / stop time of the load, the operation time zone, and the power supply / stop of the load. Is given as a function of the magnitude of the effect of the plant on the plant.

[0033] Further, the selective load shedding / closing device according to claim 3 of the present invention is characterized in that, in claim 1 or claim 2,
The cut-off / input load selection means selects one of the cut-off / input load selections based on the score given during the power supply of the load, from among the cut-off / input load selections in which the power consumption of the entire load falls within a certain range obtained from the output of the plant. The cutoff / input load is selected so that the total of the points is maximized.

According to a fourth aspect of the present invention, there is provided a selective load cut-off / input device according to any one of the first to third aspects, wherein the cut-off / input load selecting means includes an emergency signal from a plant or an external signal. When the power supply source switching signal is input from the terminal and the power supply from the plant is lower than the power consumption of the entire load, the power consumption of the entire load given by the power consumption input signal from the plant Based on the score obtained from the importance of each load, the amount is controlled to be equal to or less than the reduced power supply amount.
This is to carry out load rejection / input in accordance with the status of the plant and load and the user's request.

According to a fifth aspect of the present invention, there is provided a selective load shedding / closing device according to any one of the first to fourth aspects, wherein the cutoff deduction connected to the input / output means and the breaking / closing load selecting means. A storage means is provided. The cut-off deduction storage means stores a cut-off deduction previously input via the interface unit and the input / output means, and the cut-off / input load selection means introduces a cut-off deduction as a score when each load is cut off. Then, when the selective load is applied, the load being supplied with power is cut off to inhibit the input of another load.

According to a sixth aspect of the present invention, there is provided the selective load interrupting / closing device according to the fifth aspect, wherein the interrupting deduction is determined by determining a time required for interrupting the load or restarting the next time, an inrush current value at the time of restarting, This is given by a function including the magnitude of the effect on the load when the load is frequently interrupted, or the magnitude of the effect of the interruption of the load on the plant.

According to a seventh aspect of the present invention, there is provided the selective load interrupting / closing device according to the sixth aspect, wherein the interruption deduction point is such that a load that requires a relatively long time to interrupt, a once-interrupted restart. The load is set to a large value in order to make it difficult to cut off a load that requires a relatively long time or a relatively high cost, or a load that deteriorates quickly if interrupted frequently.

[0038] Further, in the selective load interrupting / input device according to claim 8 of the present invention, the input deduction point connected to the input / output means and the interrupting / input load selecting means in any one of claims 1 to 7. A storage means is provided. The input deduction storage means stores input deductions input in advance via the interface unit and the input / output means, and the cutoff / input load selection means introduces input deductions as points when each load is input. Then, load input with priority given to importance is realized, and load with low power consumption is prevented from being input preferentially.

According to a ninth aspect of the present invention, in the selective load shedding / closing device according to the ninth aspect, the input deduction point is determined by the importance of the load, the inrush current value at the time of starting, the time required for starting, the time required for starting the load. Is given by a cost function including the magnitude of the influence of the plant on the plant.

Further, in the selective load shedding / closing device according to claim 10 of the present invention, in the ninth aspect, the input deduction point is:
For loads that you want to turn on relatively quickly, the value is set to a small value to make it easier to turn on. It is set to a large value to delay.

Further, a selective load interrupting / inputting method according to claim 11 of the present invention is a selective load interrupting / inputting method for selectively interrupting / inputting a plurality of loads connected to a private power generation plant. Then, information on the amount of power that can be supplied from the plant, the amount of power consumed by the load, or the rated amount of power and the operation / stop information of the load, and the importance of the score given during the power supply to each load are described. In addition, the candidate of the cutoff / input load is selected so as to satisfy the condition of the electric energy information, and among the selected candidate of the cutoff / input load, the candidate that gives the maximum score to the entire load is determined as the optimum cutoff / input load. Is to be selected as

[0042]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, Embodiment 1 of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a first embodiment of the present invention. Components similar to those described above (see FIG. 15) are denoted by the same reference numerals, and detailed description thereof is omitted.

In FIG. 1, reference numeral 10 denotes a selective load interrupting / input device, 20 denotes a plant for private power generation including a generator, 30
Is an external terminal operated by a user, 40 is a plant 2
It is the load of the consumer who holds 0.

A plurality of loads 40 are connected to the plant 20 via the selective load interrupting / input device 10. Further, the load 40 is provided with a sensor means (not shown) for detecting the power consumption, and the detected power consumption (see the broken line) is input to the selected load interrupting / input device 10.

The selective load interrupting / input device 10 is connected to the plant 20 and the external terminal 30, and transmits / receives information to / from the external terminal 30 while selectively interrupting / inputting the load 40. The following components 12 to 17 are provided.

Reference numeral 12 denotes input / output means connected to the plant 20 and the load 40;
A cut-off / input load selecting means for executing the main function (selection function of cut-off / input load) is an interface unit connected to the external terminal 30.

The interface unit 14 takes in information such as the importance of the load 40 (input from the user via the external terminal 30) and displays the selected cut-off / input load on the external terminal 30 on the user side. .

The input / output means 12 includes an interface unit 14
, And controls the plant 20 under the control of the cut-off / input load selection means 13. The input / output unit 12 takes in information on the amount of power that can be supplied, the operation / stop state of the load 40, or the amount of power consumption of the load 40 from the plant 20. While taking in information,
For example, information on the load 40 to be interrupted is transmitted to the plant 20 and the interface unit 14.

Reference numeral 15 denotes supply amount storage means, reference numeral 16 denotes load state storage means, and reference numeral 17 denotes importance storage means, which are interposed between the input / output means 12 and the cutoff / input load selection means 13, respectively.

The supply amount storage means 15 stores the supplyable electric energy information received from the plant 20 via the input / output means 12. The load state storage unit 16 stores the power consumption of the load 40 (or the load 40 required for calculating the power consumption).
(Rated power amount and operation / stop information).

The importance storage means 17 stores information indicating the importance of the load 40 input from the user via the external terminal 30, the interface unit 14 and the input / output means 12, that is, during power supply to each load 40. Stores the score given.

The cut-off / input load selecting means 13 outputs the load 4
Based on the cutoff / input amount and the importance of 0, a cutoff / input load candidate is selected so as to satisfy the condition in the supply amount storage means 15 and given to the entire load among the selected cutoff / input load candidates. The one that gives the maximum score (importance) is selected as the optimal cutoff / input load.

At this time, the breaking / closing load selecting means 13
Derives an optimization problem, selects an optimal cutoff / input load, and stores the load to be input / output in the load state storage unit 16.
Tell

The information indicating the cutoff / input amount of each load 40 includes information on the amount of power that can be supplied to each load 40 and the amount of power required to supply power to each load 40. The information indicating the degree of importance includes the ratio of the operation time / stop time of the load 40, the operation time zone, and the power supply / stop of the load 40 in the plant 2.
It is given by a function of the magnitude of the effect on zero.

Further, the cutoff / input load selection means 13 selects the cutoff / input load based on the score given during the power supply of the load 40 so that the power consumption of the entire load falls within a certain range obtained from the output of the plant 20. Among them, the cut-off / make-up load is selected so that the total score of the loads to be fed becomes maximum.

Further, the breaking / closing load selecting means 13
When an emergency signal from the plant 20 or a switching signal of the power supply source from the external terminal 30 is input and the amount of power supplied by the generator is lower than the power consumption of the entire load, the power consumption from the plant 20 is reduced. Based on the score obtained from the importance of each load 40, the plant 20 and the load 4 are controlled so that the power consumption of the entire load given by the power input signal is suppressed below the reduced supply power.
The load is turned on / off according to the status of 0 and the user's request.

Next, the flow of selective load shedding / closing according to the first embodiment of the present invention will be described with reference to FIGS. First, the user can use the external terminal 3
The importance of each load 40 is input to the importance storage unit 17 via the interface 0 and the interface unit 14 and stored in advance.

At this time, the importance is a value meaning a score given when each load 40 is supplied with power.
The numbers need not necessarily be continuous natural numbers, and may be decimal numbers, negative numbers, or zero, or the same value may be input to a plurality of loads 40.

When the importance of the load 40 is set, the use history of the load 40 (for example, whether or not the load 40 is a continuously operating device, the lighting is rarely used in the daytime and midnight, but is extremely low in the evening to nighttime). And the magnitude of the effect on the plant 20 when the load 40 is cut off (for example, interlocking with other equipment, and physical and psychological effects on workers). , The ratio of the operation time / stop time of the load 40, the operation time zone, and a function of the magnitude of the above-described influence.

When there are a plurality of evaluators,
By performing a questionnaire using the paired comparison method as shown in FIG. 2, taking out two loads from the entire load and comparing them, and asking which load is more important for each group,
A method of calculating a comprehensive evaluation result can be applied.

However, since the result of the paired comparison method is a psychological scale having an average of “0”, as shown in FIG. 2, a certain number (for example,
For example, the total load is a positive value (for example, load A = 8, load B = 20, load C = 3) by a method such as adding “30”).
8, load D = 54).

On the other hand, in FIG. 1, when an emergency signal is input from the plant 20 via the input / output means 12, the selective load shedding / closing device 10 supplies the amount of power that can be supplied and the amount of power consumption of each load 40. From the plant 20 and supply amount storage means 15 and load state storage means 1 respectively.
6 is stored.

The power consumption of each load 40 can be obtained from the running / stopped state by storing the rated power in advance. In addition, the upper limit and the lower limit of the range (supply amount) of electric power that can be supplied to each load 40, for example, “0 kW or more to 1000 kW or less” or “500 kW or more to 700 kW”
"W or less" is acquired from the plant 20.

The cutoff / input load selection means 13 receives the information stored in the supply amount storage means 15, the load state storage means 16 and the importance storage means 17, and receives the number of loads n,
The following equation is solved using the power consumption Pi of each load, the importance Ai, the power supply / shutoff state Fi (Fi = 1: power supply, Fi = 0: cutoff), the upper limit Pmax and the lower limit Pmin of the supply amount.

[0065]

(Equation 1)

The above equation finds a combination of power supply / interruption of the load that maximizes the total score indicating that power is being supplied to the load, with the relationship between the power consumption and the supplied power of all loads as constraints. It is equivalent to a maximization problem.

When there are a plurality of combination candidates that can obtain the maximum score, for example,
In this, the number of interruption loads may be automatically selected as small as possible, or the external terminal 30 may be driven via the interface unit 14 to present a combination of interruption loads to the user. The user may select it.

FIG. 3 is an explanatory diagram showing a process for solving the above equation (maximum value problem) and selecting a shutdown candidate from among the seven loads A to G when a system fault occurs. Loads (candidates) are shown, and (1) to (10)... Show candidate combinations of cutoff loads.

In FIG. 3, the total power consumption of the loads A to G is 2300 kW, and the importance of each of the loads A to G is
The loads A and B are very important, and the loads C to G are provided assuming a case where the loads A and B are less important than the loads A and B.

Here, a case where the maximum value problem of the above equation is solved when the upper limit of the amount of power that can be supplied due to a system accident or the like becomes 1700 kW (the lower limit is 0 kW) will be described.
In addition, there are 114 combinations of power supply / interruption of loads satisfying the condition of the supply amount, and the main combinations are shown.

In the above-described conventional apparatus, since the load G having the lower priority is added to the cutoff candidates, the combination candidate (1) in FIG. 3 is the optimum cutoff load. However, according to the present invention, paying attention to the fact that there is no large difference in the importance of the loads C to G, the score of the combination candidate (8) having a small number of cutoff loads is maximized. G is selected as a breaking load candidate.

FIG. 4 is an explanatory diagram showing the interruption candidate selection processing when only the load A is very important, and shows a comparison between the conventional method and the present method. In FIG.
Only load A is given a significantly higher importance.

In this case as well, the loads E to G having a low priority are not selected as the interrupting load candidates as in the conventional method, but only the load B having a slightly higher priority is selected as the interrupting load candidate. Is done.

In the above-described conventional apparatus, even if the load is slightly higher in the priority order for the purpose of shortening the cutoff time, if the load is cut off, the load immediately falls within the range of the supplied electric energy. In some cases, the condition is set to cut off that load.However, it is necessary to determine whether to cut off multiple loads with lower priority or to cut off a single load with higher priority. Can not.

However, according to the present invention, it is possible to determine whether to cut off a plurality (or a large number) of loads having lower priority or a single (or a few) load having a slightly higher priority. it can.

For example, when it is desired to execute load shedding in order from the one with the lowest priority as in the conventional apparatus, as shown in FIG. What is necessary is just to set the importance.

As described above, the selective load shedding / closing device 10
Is given by the power consumption input signal when an emergency signal is input or when a power supply source switching signal is generated, that is, when the amount of power supplied by the private power generation of the plant 20 is lower than the power consumption of the entire load. Based on the power supply score obtained from the importance of each load, the state of the private power generation and the load, and the load according to the user's request so that the power consumption of the entire load is suppressed below the reduced supply power amount. Execute shutoff / closing.

At this time, the power consumption of the entire load is determined based on the importance indicating the score given when the power is supplied to the load, instead of the priority of the load (interruption priority or power supply priority). Among the cutoff / input loads selected within a certain range (determined from the output of the plant 20), the cutoff / input load is selected so that the total of the importance of the load to be supplied is maximized, and the importance is selected. By changing the way of giving, various load shedding selections can be made quickly.

Therefore, in a customer who owns the plant 20 for private power generation, all loads are prevented from being stopped due to a decrease in supply voltage when the power system is disconnected.
By selectively interrupting the circuit breaker of the load, the power consumption of the entire load can be suppressed within the range of the supplied power.

Further, when the plant 20 is started up and the supply source to the load is switched from the system to the private power generation, each circuit breaker is opened and closed so that the plant 20 is not overloaded and stopped. It can be derived by an optimization problem, and can selectively execute load cutoff / input.

Also, when the supplied electric energy is restored by the restoration of the system or the start of the plant 20, the electric energy that can be supplied from the plant 20 via the input / output means 12 is acquired and stored in the supplied energy storage means 15. By updating the information on the supplied supply amount, when one or more loads among the currently disconnected loads reach the supply power amount that can be input, the cutoff / input load selection unit 13 calculates the total importance. Can be executed so that the load becomes higher.

Further, since the importance can be given not by the priority but by the load power supply score, it is not necessary to give the load priority at equal intervals, for example, “very important load” or “priority”. The same load can be expressed, and the diversification of the selective load shedding / input device 10 can be realized.

Further, the importance is given by the function of the ratio of the operation time / stop time, the operation time zone and the magnitude of the influence on the plant 20, so that it is not necessary to conduct a questionnaire or the like, and the importance can be easily determined. At the same time, objective evaluation becomes possible.

Embodiment 2 In the first embodiment, the supply amount storage unit 15, the load state storage unit 16, and the importance storage unit 17 are provided as storage units in the selective load disconnection / injection device 10, but a cutoff deduction storage unit is further provided. You may.

FIG. 6 is a block diagram showing a second embodiment of the present invention to which a cut-off deduction storage means is added. The same components as those described above (see FIG. 1) are denoted by the same reference numerals or symbols. "A" is appended to the end, and the detailed description is omitted.

In FIG. 6, reference numeral 18 denotes a cut-off deduction storage means provided in the selective load cut-off / input device 10A, which is interposed between the input / output means 12 and the cut-off / input load selecting means 13A.

The cut-off deduction storage means 18 stores cut-off deductions previously input from the user via the interface section 14 and the input / output means 12. The interruption deduction is given when the load 40 is interrupted, and means a penalty relating to the interruption. A relatively large value is set for a load that the user does not want to interrupt.

The cutoff / input load selecting means 13A introduces a cutoff deduction as a score when each load 40 is interrupted, and when a selected load is input, the load being supplied is interrupted and another load is input. Is banned.

The cut-off point is determined by the time required for the load 40 to be cut off or restarted again, the inrush current value at the time of restarting, the load 40
Is frequently given by a function including the magnitude of the effect on the load when the load is frequently interrupted (turned on / off), or the magnitude of the influence on the plant 20 due to the interruption of the load 40.

Further, the cut-off penalty points are a load that requires a relatively long time to cut off, a load that requires a relatively long time and a relatively high cost to restart once the switch is cut off, or an aging when the switch is frequently interrupted. For faster loads,
It is set to a large value to make it difficult to block.

Next, the processing operation according to the second embodiment of the present invention will be described with reference to FIGS. 7 and 8 together with FIG. First, the user can use the external terminal 3
0 and selective load shedding /
The interruption deduction is input to the input device 10A, and the interruption deduction is stored in advance in the interruption deduction storage means 18 via the input / output means 12.

At this time, the load state storage means 16 stores the power consumption of the load 40 (or the rated power of the load 40 and the operation / stop state) and the current power supply / cutoff information of the load 40 (power supply of the load 40). Indicates whether it is possible).

Further, the cut-off point is determined by the time required for the load 40 to be cut off or restarted next time, the inrush current value at the time of restarting the load 40, the magnitude of the influence on the load when the load 40 is frequently interrupted, the load 40 Is given as a function of the magnitude of the effect of the interruption of the power supply on the plant 20 (system).

As a result, a load that requires a relatively long time to shut down, a load that requires a long time to restart and a relatively high cost once shut down, and a load that deteriorates quickly when interrupted frequently. It can be hard to be blocked.

For example, shortening of life due to intermittent Js
(Year), and using the time Ts (sec) required to shut off, if the cut-off deduction point Ds is defined as in the following equation, the cut-off deduction point Ds is obtained as shown in FIG.

Ds = Js × 100 + Ts

By introducing the cutoff deduction point Ds defined by the above equation, it is possible to prevent the supply of a load and the supply of another load when a selected load is applied.

For example, as in the specific example shown in the explanatory view of FIG. 8, since only 900 kW is currently supplied, the power supply amount increases to 1000 kW in a state where the load B (power consumption is 400 kW) is cut off. A description will be given of the load input process in the case where the load is applied.

In FIG. 8, first, in the case of the conventional method (load input based on the order of importance), the supply amount is increased by 100 kW and the two loads C and D are cut off to provide a margin of 400 kW. Is generated, it is possible to supply power to the load B having higher importance.

In this case, the power supply score is “11 (= 8 + 2 + 1)” when power is supplied to the loads A, C, and D, whereas “12 (= 8 + 2)” when power is supplied to the loads A and B.
4), the loads C and D are cut off and power is supplied to the load B.

Therefore, according to the conventional apparatus, when the power supply is increased by restoring the power system or starting the plant 20 for private power generation in a state where some loads are cut off, when the load is turned on. In addition, loads (for example, C and D) with low power consumption are operated /
The suspension will be repeated. Frequent interruption of the load in this manner is not preferable because the rush current at the time of turning on the power supply may increase or generate heat.

Therefore, in the present invention, a point deduction process (interruption deduction) is introduced when the power supply load is interrupted. That is, in the situation as shown in FIG.
The power supply score to B is “12 (= 8 + 4)”, but the cutoff deduction of the loads C and D is “6 (= 4 + 2)”, so the overall score is “6 (= 12−6)”. , "1
Since the score is lower than “1”, the change of the cutoff / input of the loads A to D is not executed.

As described above, a load having a small deduction point is easily interrupted, and a load having a large deduction point is not easily interrupted. In this case, if there is a load to be input even when another load is cut off, the importance for the load may be set to a value larger than the sum of the cutoff points of the other loads.

Embodiment 3 In the second embodiment, the cut-off deduction is introduced. However, the insertion deduction may be introduced. Hereinafter, a third embodiment of the present invention in which the input deduction is introduced will be described with reference to FIGS. 9 to 11.

FIG. 9 is a block diagram showing a third embodiment of the present invention. The same components as those described above (see FIGS. 1 and 2) are denoted by the same reference numerals or are denoted by "B" after the reference numerals. And the detailed description is omitted. 10 and 11 are explanatory diagrams showing a load selecting operation according to the third embodiment of the present invention.

In FIG. 9, reference numeral 19 denotes an input deduction storage means provided in the selective load interrupting / inserting device 10B, which is interposed between the input / output means 12 and the interrupting / input load selecting means 13B.

The input deduction storage means 19 stores the input deduction entered in advance by the user via the interface section 14 and the input / output means 12.

The input deduction point is given when power supply to a load that is being cut off is started, and means a penalty related to inputting. A relatively large value is set for a load that is not desired to be input.

The cut-off / input load selecting means 13B introduces an input deduction as a score at the time of inputting each load 40, realizes a load input with priority given to importance, and inputs loads with low power consumption preferentially. Is prohibited.

The input deduction is given by a cost function including the importance of the load 40, the rush current value at the time of startup, the time required for startup, and the magnitude of the effect of the loading of the load 40 on the plant 20.

The input deduction is based on the importance of the load 40, the rush current value at the time of starting, the time required for starting, the load 40
Can be obtained from a cost function such as the magnitude of the influence of the input of the power supply on the system.

Accordingly, the input deduction point is set to a small value (such as zero) for a load to be input relatively quickly to make it easier to input, and conversely, the inrush current and the cost required for starting are relatively low. The load is set to a large value in order to lower the priority of the input and delay the input for a load that is highly affected by the input.

For example, using the inrush current Id (A) and the time Td (sec) required for starting (starting), if the closing deduction point Dd is defined by the following equation, the closing deduction point Dd is obtained as shown in FIG. Can be requested.

Dd = Id / 10 + Td

By introducing the input deduction Dd defined by the above equation, it is possible to prevent loads with low power consumption from being input preferentially, and to implement load input with priority given to importance.

For example, as shown in FIG.
Since only 400 kW is supplied, load B,
A description will be given of load input when power supply increases in a state where C and D are cut off.

In FIG. 11, first, according to the load input processing by the conventional apparatus, the supply amount is increased by 100 kW to 50
When the load becomes 0 kW, the load C is applied, and
If the kW increase is awaited, loads B having higher power consumption can be input, but loads with lower power consumption are input in order.

Therefore, in the present invention, a point deduction process (input deduction) is introduced when the load being fed is cut off. That is, in the situation of FIG.
At the time of kW power supply, the score (importance) is "8", but when the load C is turned on when the amount of supplied power increases to 500 kW, "10" (score by power supply of the loads A and C). -From "4" (deduction due to loading of load C), the score is "6".

Therefore, the score “6” when the load C is applied is
Is lower than the current score “8”, so that the load C is not applied even if the supplied electric energy increases to 500 kW. Further, when the power supply amount reaches 600 kW, any of the loads B, C, and D can be additionally supplied, but only the load B having the highest importance is additionally supplied.

Because the load B is added, “1”
2 "(= 8 + 4: score by feeding the loads A and B)-
From “2” (deduction due to loading of load B), the score is “1”
This is because it is “0”, which is larger than the current score “8”.

At this time, a load having a large input deduction is difficult to be input, and a load having a small input deduction is easily input. In addition, a load whose input deduction is larger than the importance is not input until the total power consumption of all other loads falls below the lower limit of the amount of power that can be supplied. Loads with high importance can be preferentially input.

As described above, by introducing the input deduction, it is possible to prevent loads with small power consumption from being input with priority, and to realize load input with priority given to importance.

Further, the input deduction is given by a cost function such as the importance of the load 40, the inrush current value at the time of startup, the time required for startup, and the magnitude of the influence of the input of the load 40 on the system. The load is set to a small value (zero or the like) for the load to be applied, so that the load can be easily applied.

Conversely, for a load having a large influence such as an inrush current and a cost required for starting, the input deduction point is set to a large value, and the input can be delayed.

Embodiment 4 Note that, in the second embodiment,
In 3, only one of the cut-off deduction and the input deduction is introduced, but both the cut-off deduction and the input deduction may be introduced. Hereinafter, with reference to FIG. 12, a fourth embodiment of the present invention in which the cut-off deduction and the introduction deduction are introduced will be described.

FIG. 12 is an explanatory diagram showing the relationship between the cutoff deduction and the closing deduction. In FIG. 12, both the cut-off deduction and the input deduction are set to small values so that a load used for power amount adjustment is easily cut off and turned on.

For important loads, the degree of importance is set large, the input deduction is set to a small value, and the cut-off deduction is set to a large value so that the load is easy to enter and it is hard to be shut off.

Further, in order to make it difficult for the load that prioritizes the maintenance of the current state to be cut off / closed, both the cut-off deduction and the closing deduction are set to large values.

As described above, by introducing the cutoff deduction and the input deduction, when the selected load is input, the load being supplied is interrupted to prevent other loads from being input and the power consumption is reduced. It is possible to prevent a small load from being input with priority, and to achieve load input with priority given to importance.

[0130]

As described above, according to the first aspect of the present invention, a selective load interrupting / inputting device for selectively interrupting / inputting a load connected to a plant for private power generation and a plurality of loads. , An interface unit connected to an external terminal operated by a user, input / output means connected to a plant, a load, and an interface unit; a supply amount storage means, a load state storage means, Power supply storage means, load state storage means, and load / shutdown load selection means connected to the importance storage means, wherein the supply amount storage means receives supply from the plant via input / output means. Possible load amount information is stored, and the load state storage means stores the power consumption amount of the load received from the external terminal via the interface unit and the input / output means, or The importance storage means stores the score given during the power supply to each load as importance, and the cutoff / input load selection means stores the cutoff / input of each load. Based on the quantity and importance, the cutoff / input load candidates are selected so as to satisfy the conditions in the supply amount storage means, and the score given to the entire load among the selected cutoff / input load candidates is maximized. Is selected as the most suitable interrupting / input load, so that the load circuit breaker can be selectively shut off to prevent all loads from stopping due to a drop in supply voltage when the power system is disconnected. This has the effect of providing a selective load shedding / closing device in which the power consumption of the entire load is suppressed within the range of the supplied power.

According to a second aspect of the present invention, in the first aspect, the importance is a ratio of a load operation time / stop time, an operation time zone, and an influence of a load power supply / stop on a plant. Since it is provided by a function of the size, when starting the plant for private power generation and switching the supply source to the load from the system to private power generation, the plant equipment will be overloaded and will not stop. In addition, there is a descent in which a selective load interrupting / injecting device that performs the selective interrupting / injection of the load by deriving the switching of each circuit breaker by an optimization problem is obtained.

According to a third aspect of the present invention, in the first or second aspect, the cut-off / input load selecting means sets the power consumption of the entire load on the basis of the score given during the power supply to the load. Among the selections of cut-off / input loads that fall within a certain range obtained from the output of the plant, the cut-off / input loads are selected so that the total of the scores of the loads to be supplied is maximized. There is an effect that a selective load shedding / input device in which the power consumption is suppressed within the range of the supplied power can be obtained.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the cut-off / input load selecting means includes an emergency signal from a plant or a power supply source from an external terminal. Is switched, and the power supply from the plant is lower than the power consumption of the entire load, the power consumption of the entire load given by the power consumption input signal from the plant is reduced. Based on the score obtained from the importance of each load, the load is cut off / input according to the situation of the plant and the load and the demand of the user so that the load is suppressed to the power amount or less. There is an effect that a selective load shedding / input device in which the power consumption is suppressed within the range of the supplied power can be obtained.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the apparatus further comprises a cut-off deduction storage means connected to the input / output means and the cut-off / input load selecting means. The deduction point storage means stores the cutoff deduction previously input via the interface unit and the input / output means, and the cutoff / input load selection means introduces the cutoff deduction as a score when each load is interrupted. In this case, the load being fed is cut off to prevent other loads from being applied.Therefore, when the selected load is turned on, the load being fed is cut off and another load is turned on. Thus, there is an effect that a selective load interrupting / input device in which the power consumption of the entire load is suppressed within the range of the supplied power amount can be obtained.

According to the sixth aspect of the present invention, in the fifth aspect, the cutoff deduction means that the time required for the interruption of the load or the next restart, the rush current value at the restart, and the load are frequently interrupted. Sometimes the magnitude of the effect on the load, or
Since the cutoff of the load is given by a function including the magnitude of the effect on the plant, there is an effect that a selective load cutoff / input device in which the power consumption of the entire load is suppressed within the range of the supplied power can be obtained. .

According to a seventh aspect of the present invention, in the sixth aspect of the present invention, the cut-off deduction means a load that requires a relatively long time to shut down, a relatively long time to restart once the load is shut down, and a comparison. For loads that require extremely high cost, or for loads that deteriorate quickly if they are interrupted frequently, the power consumption of the entire load is set within the range of the supplied power because it is set to a large value to make it difficult to cut off. Thus, there is an effect that a selective load rejection / injection device can be obtained.

According to an eighth aspect of the present invention, in any one of the first to seventh aspects, the input / output means and the input / output load selecting means are provided with input / output deduction storage means. The deduction point storage means stores the input deduction points input in advance via the interface unit and the input / output means, and the cutoff / input load selection means introduces the input deduction points as points when each load is input, and prioritizes the importance. To prevent loads with low power consumption from being given priority, and to prevent loads with low power consumption from being given priority. This makes it possible to realize load input with priority given to the degree, and to provide a selective load interrupting / input device in which the power consumption of the entire load is suppressed within the range of the supplied power.

According to the ninth aspect of the present invention, in the eighth aspect, the input deduction is based on the importance of the load, the rush current value at the time of starting, the time required for the starting, and the influence of the input of the load on the plant. Since it is provided by the cost function including the size, there is an effect that a selective load cut-off / input device in which the power consumption of the entire load is suppressed within the range of the supplied power can be obtained.

According to the tenth aspect of the present invention, in the ninth aspect, the input deduction point is set to a small value for a load to be input relatively quickly so as to make it easier to input, and the inrush current and For loads that require a relatively high start-up cost and that have a relatively large effect of input, the value is set to a large value to delay the input, so the power consumption of the entire load is kept within the range of the supplied power. There is an effect that a selective load rejection / input device can be obtained.

According to an eleventh aspect of the present invention, there is provided a selective load interrupting / inputting method for selectively interrupting / inputting a plurality of loads connected to an in-house power generating plant. Using the power supply information that can be supplied, the power consumption of the load, or the rated power supply and operation / stop information of the load, and the importance of the points given during the power supply to each load, Cut off to meet the condition /
The input load candidate is selected, and the one that maximizes the score given to the entire load among the selected interrupting / input load candidates is selected as the optimal interrupting / input load. In order to prevent all loads from stopping due to a drop in supply voltage, the load breaker can be selectively cut off, and the power consumption of the entire load is kept within the range of the supplied power. / There is an effect that a charging method can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a selective load shedding / closing device according to Embodiment 1 of the present invention.

FIG. 2 is an explanatory diagram showing an importance setting operation according to the first embodiment of the present invention;

FIG. 3 is an explanatory diagram illustrating a load selecting operation according to the first embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a load selecting operation according to the first embodiment of the present invention.

FIG. 5 is an explanatory diagram showing a load selecting operation according to the first embodiment of the present invention.

FIG. 6 is a block diagram showing a selective load shedding / closing device according to a second embodiment of the present invention.

FIG. 7 is an explanatory diagram showing a setting state of a cutoff deduction according to a second embodiment of the present invention.

FIG. 8 is an explanatory diagram illustrating a load selection operation according to a second embodiment of the present invention.

FIG. 9 is a block diagram showing a selective load shedding / closing device according to a third embodiment of the present invention.

FIG. 10 is an explanatory diagram showing a setting state of a insertion deduction according to Embodiment 3 of the present invention.

FIG. 11 is an explanatory diagram showing a load selecting operation according to a third embodiment of the present invention.

FIG. 12 is an explanatory diagram showing a setting state of a cutoff deduction and a closing deduction according to Embodiment 4 of the present invention.

FIG. 13 is a flowchart showing a load selection operation by a conventional selective load shedding / closing device.

FIG. 14 is an explanatory diagram showing a load selection operation by a conventional selective load shedding / closing device.

FIG. 15 is a block diagram showing another conventional selective load interrupting / input device.

FIG. 16 is an explanatory diagram showing a load selecting operation by another conventional selective load shedding / closing device.

[Explanation of symbols]

10, 10A, 10B Selective load shedding / closing device, 12
Input / output means, 13, 13A, 13B interruption / input load selection means, 14 interface unit, 15 supply amount storage means, 16 load state storage means, 17 importance storage means, 18 interruption deduction storage means, 19 input deduction storage means, 20 plants, 30 external terminals, 40 loads, A ~
G Load, Ds cut off deduction, Dd closing deduction.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tomoe Takahashi 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Inventor Hiroyuki Sasao 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F term in Ryo Denki Co., Ltd. (reference) 5G066 HA24 HB02 KA01 KA11 KD01

Claims (11)

[Claims] An interface connected to an external terminal operated by a user in a selective load interrupting / inputting device connected to a private power generation plant and a plurality of loads for selectively interrupting / inputting the load. Unit, an input / output unit connected to the plant, the load, and the interface unit; a supply amount storage unit, a load state storage unit, and an importance storage unit connected to the input / output unit; and the supply amount storage unit A load / shutdown load selection unit connected to the load state storage unit and the importance storage unit, wherein the supply amount storage unit is configured to supply the amount of power received from the plant via the input / output unit. The load state storage means stores the load received from the external terminal via the interface unit and the input / output means. Or the rated power amount of the load and operation / stop information, and the importance storage means stores a score given during power supply to each load as importance, The input load selecting means, based on the cutoff / input amounts of the respective loads and the importance, sets the cutoff / input so as to satisfy the condition in the supply amount storage means.
Selecting a load to be applied, and selecting, from among the selected load / interruption load candidates, a candidate giving the maximum score to the entire load as an optimal load / interruption load; / Input device. 2. The method according to claim 1, wherein the importance is given by a function of a ratio of an operation time / stop time of the load, an operation time zone, and a magnitude of influence of power supply / stop of the load on the plant. The selective load shedding according to claim 1,
Input device. 3. The cut-off / input load selecting means, based on a score given during the power supply of the load, the cut-off / input load such that the power consumption of the entire load falls within a certain range obtained from the output of the plant. The selected load interrupting / inputting device according to claim 1 or 2, wherein the selection of the interrupting / inputting load is performed such that the total of the scores of the loads to be fed is maximized. 4. The load / shutdown load selection means receives an emergency signal from the plant or a switching signal of a power supply source from the external terminal, and supplies power from the plant to the entire load. When the power consumption is lower than the power consumption of the load, the importance of each of the loads is controlled so that the power consumption of the entire load given by the power consumption input signal from the plant is suppressed to the reduced power supply or less. 4. The selection according to any one of claims 1 to 3, wherein a load shedding / inputting is performed according to a condition of the plant and the load and a request of the user based on a score obtained from the user. Load shedding / closing device. 5. An interruption deduction storage means connected to the input / output means and the interruption / input load selection means, wherein the interruption deduction storage means is inputted in advance through the interface unit and the input / output means. The interruption / deduction load is stored, and the interruption / input load selection means introduces the interruption deduction as a score at the time of interruption of each of the loads. The selective load shedding / closing device according to any one of claims 1 to 4, wherein the switching is prohibited. 6. The interruption deduction point is a time required for interruption of the load or the next restart, an inrush current value at the time of restart, a magnitude of an influence on the load when the load is frequently interrupted, or 6. The selective load shedding / injection device according to claim 5, wherein the load shedding is given by a function including a magnitude of an influence on the plant. 7. The shut-off penalty may be a load that requires a relatively long time to shut down, a load that requires a relatively long time or a relatively high cost to restart once the shut-off is performed, or an aging when the load is frequently interrupted. For loads where
7. The selective load interrupting / closing device according to claim 6, wherein the value is set to a large value so as to make it difficult to be interrupted. 8. An input deduction storage means connected to the input / output means and the cutoff / input load selection means, wherein the input deduction storage means is inputted in advance through the interface section and the input / output means. The input / output deduction point is stored, and the cutoff / input load selecting means introduces the input / input deduction point as a score at the time of inputting each of the loads, realizes the load input with priority given to the importance, and reduces the load with a small power consumption. The selective load shedding / closing device according to any one of claims 1 to 7, wherein the priority load is prohibited. 9. The input deduction point is given by a cost function including the importance of the load, an inrush current value at the time of start-up, a time required for start-up, and a magnitude of influence of the load input on the plant. 9. The selective load shedding / closing device according to claim 8, wherein 10. The input deduction point is set to a small value for a load to be input relatively quickly in order to make it easier to input, the inrush current and the cost required for starting are relatively high,
10. The selective load interrupting / injecting device according to claim 9, wherein the load is set to a large value to delay the injecting for a load that is relatively large. 11. A selective load rejection / input method for selectively rejecting / inputting a plurality of loads connected to a private power generation plant, comprising: a power supply information that can be supplied from the plant; Using the power consumption amount of the load, or the rated power amount and the operation / stop information of the load, and the importance of the score given during the power supply to each of the loads, so as to satisfy the condition of the power amount information. Selecting a cutoff / input load candidate, and selecting, from among the selected cutoff / input load candidates, a candidate giving the maximum score for the entire load as an optimum cutoff / input load. Load shedding / loading method.