JP2003235166A - System link and method, apparatus, program, and recording medium for controlling power supply in system interconnection - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce power cost. <P>SOLUTION: A plurality of small generator sets 3-1 to 3-N of a small output power are installed. Thus, if one or several small generator sets are brought out of operation for maintenance or become faulty, power can be supplied by the remaining small generator sets. If a plurality of the small generator sets 3-1 to 3-N are to be installed on the premises, the layout flexibility is enhanced. In this case, received power P1 is made constant, and received power P2 is varied in correspondence with the fluctuation in load power P3. Therefore, there is no danger that, due to significant fluctuation in load power P3, received power P1 exceeds a contract demand and thus the power cost is significantly increased. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grid interconnection, a power supply control method in the grid interconnection, a program for causing a computer to execute each step of the method, and a computer readable recording the program. Recording medium, power supply control device in grid interconnection, program for causing computer to function as each unit of the device, computer readable recording medium recording the program (hereinafter, simply referred to as power supply in grid interconnection Control system).

[0002]

2. Description of the Related Art A grid interconnection in which a commercial power grid and a local power grid equipped with a power generation facility are interconnected can reduce the power cost. An example of a power supply control method and / or device in such a system interconnection is described in Japanese Patent Laid-Open No. 146068/1993.

The conventional power supply control method and / or device in the grid interconnection includes one large power generation facility having a large output power value (for example, a large power generation facility including a diesel engine). is there. Also,
The power supply control method and / or device in the conventional grid interconnection is such that when the load power value used by the power load facility on the premises exceeds the rated generated power value from the large-scale power generation facility, the generated power is kept at the rated value. On the other hand, the received power from the commercial power system is varied.

[0004]

However, the above-described conventional method and / or apparatus for controlling power supply in system interconnection is provided with only one large-scale power generation facility because of facility cost and the like. For this reason, the conventional power supply control method and / or device in the grid interconnection may not be able to supply power during maintenance or failure.

In the conventional method and / or apparatus for controlling power supply in the grid interconnection, when the load power value exceeds the rated power generation value of the large-scale power generation facility, the power generation power is kept constant at the rated value, while the commercial power is controlled. The power received from the power grid is changed. Therefore, in the conventional power supply control method and / or device in the grid interconnection, the received power may exceed the contracted power and the power cost may be significantly high.

It is an object of the present invention to provide a grid interconnection that solves the above problems, and a power supply control system in the grid interconnection.

[0007]

In order to achieve the above object, the invention according to claim 1 is characterized in that a plurality of small-sized power generation facilities having a small output power value are provided.

As a result, in the invention according to claim 1, even if maintenance or failure of one or several small power generation facilities occurs, it is possible to supply electric power by the remaining small power generation facilities. . Further, the invention according to claim 1 is such that when a plurality of small power generation facilities are installed in a premises,
Greater flexibility in placement layout.

Further, the invention according to claim 2 is characterized in that the small-sized power generation facility is composed of a small-sized gas turbine, that is, a so-called micro gas turbine.

As a result, the invention according to claim 2 compares the cost and efficiency per unit of output power with a micro gas turbine having a small output power and a prime mover of another power generation facility, for example, a diesel engine. Micro gas turbines are cheaper and more efficient.

Further, the invention according to claim 3 supplies the power to the power load facility on the premises by keeping the received power from the commercial power system constant and varying the generated power from the plurality of small power generation facilities. In order to do so, the received power value (PA) and the load power value (PB) are measured, and the received power value (PA) is subtracted from the load power value (PB) to generate power value (PC).
Is calculated and the generated power value (PC) is divided by the power value (PD) of 100% output of one small power generation facility, The control command is output, and the power value (PC) from the generated power value (PC) to 100% output of one small power generation equipment and the number of quotients (M) are output to one small power generation equipment. A control command for outputting a power value (PE) obtained by subtracting the product of is output.

As a result, according to the third aspect of the present invention, the received electric power is constant and the generated electric power is changed in accordance with the change of the load electric power. There is no fear that the power cost will be significantly higher than the above. Further, the invention according to claim 3 is efficient because a number of (M) small-sized power generation facilities are operated at a rated rate. Particularly, when the small power generation facility is a micro gas turbine, the efficiency is further improved by the rated operation.

The invention according to a fourth aspect is characterized in that, in the third aspect, the operation of the remaining small power generation equipment is stopped.

As a result, the cost of the invention according to claim 4 is further reduced.

The invention according to claim 5 is the same as in claim 3, wherein the remaining small power generation equipment is operating and
% Output standby state.

As a result, according to the fifth aspect of the present invention, it is possible to quickly respond to a large change in the load power, so that the received power can be reliably kept constant.

Further, the invention according to claim 6 supplies the electric power to the electric power load equipment on the premises by keeping the electric power received from the commercial electric power system constant and varying the electric power generated from the plurality of small power generation equipment. In order to do so, the received power value (PA) and the load power value (PB) are measured, and the received power value (PA) is subtracted from the load power value (PB) to generate power value (PC).
Is calculated, and the control command of the average power value (PF) output obtained by dividing the generated power value (PC) by the total number (N) of the small power generation facilities is output to all the small power generation facilities (N). Characterize.

As a result, in the invention according to claim 6, as in the invention according to claim 3, the received power is constant,
Since the generated power is changed according to the change of the load power, there is no fear that the received power will exceed the contracted power and the power cost will be significantly increased due to the large change of the load power. Further, in the invention according to claim 6, since a small number of (N) small power generation facilities are operated, it is possible to promptly respond to a large change in the load power value, and to reliably receive the received power value. It can be held constant.

Further, the invention according to claim 7 is characterized in that a control command is output in parallel to a plurality of small power generation facilities.

As a result, in the invention according to claim 7, since quick control is possible, it is possible to quickly respond to a large change in load power, and the received power can be reliably kept constant. be able to.

Further, the invention according to claim 8 outputs a control command to one master small-sized power generating equipment among a plurality of small-sized power generation equipment, and the master small-sized power generation equipment is operated by another slave. The feature is that the control command is output in parallel to the small power generation facility.

As a result, in the invention according to claim 8, the structure of the power supply control means for outputting the control command is simplified.
Further, the invention according to claim 8 can perform quick control similarly to the invention according to claim 7, and can respond rapidly to a large change in load power,
The received power can be reliably kept constant.

In the invention according to claim 9, the power supply control means is provided in each of a plurality of small power generation facilities, and the power supply control means of one of the plurality of small power generation facilities is provided. A master that can be switched and a slave that can switch the power supply control means of the remaining small power generation equipment,
It is characterized by

As a result, in the invention according to claim 9, even if maintenance or failure of one or several power supply control means occurs, control commands can be output by the remaining power supply control means. Therefore, the generated power can be reliably supplied.

According to a tenth aspect of the present invention, a computer is provided with the steps of the power supply control method in the grid interconnection according to any one of the third to ninth aspects.
It is a program to be executed.

As a result, the invention according to claim 10 causes each of the power supply control methods in the grid interconnection according to any one of claims 3 to 9 by causing the computer to read the program. The steps can be performed. Therefore, the invention according to claim 10 can achieve the same effect as the invention according to claims 3 to 9.

According to an eleventh aspect of the present invention, a computer is provided with the steps of the power supply control method in the grid interconnection according to any one of the third to ninth aspects.
A computer-readable recording medium recording a program to be executed.

As a result, the invention according to claim 11 causes the computer to read the program recorded in the recording medium, thereby allowing the computer to read the program.
Each step of the power supply control method in the grid interconnection described in any one of 9 can be executed. Therefore, the invention according to claim 11 is the above-mentioned claim 3 to
It is possible to achieve the same effects as the invention according to the ninth aspect.

According to a twelfth aspect of the present invention, the received power from the commercial power system is made constant, and the generated power from a plurality of small power generation facilities is varied to supply the power to the power load facility on the premises. In order to do so, from the received power value measuring means for measuring the received power value (PA), the load power value measuring means for measuring the load power value (PB) used by the power load facility, and the load power value (PB) The received power value (PA) is subtracted to calculate the generated power value (PC), and the generated power value (PC) is the power value of 100% output of one small power generation facility among a plurality of small power generation facilities. One unit other than a small power generation facility that outputs a 100% output control command to a small number of small power generation facilities (M) that is an integer number of the quotient divided by (PD) and at the same time inputs a 100% output control command The power generation value ( 10 from C) of one of the small power generation equipment
And a power supply control means for outputting a control command for output of a power value (PE) obtained by subtracting the product of the power value (PD) of 0% output and the number of units (M) of the quotient. Characterize.

As a result, according to the invention of claim 12, as in the invention of claim 3, the received power is constant and the generated power is changed in accordance with the change of the load power. There is no fear that the received power will exceed the contracted power and the power cost will be significantly high due to a large fluctuation of. In addition, the invention according to claim 12 is efficient because several (M) small-sized power generation facilities are operated at the rated power. Particularly, when the small power generation facility is a micro gas turbine, the efficiency is further improved by the rated operation.

The invention according to claim 13 is characterized in that the power supply control means outputs a stop control command to the remaining small power generation equipment.

As a result, the cost of the invention according to claim 13 is further reduced, like the invention according to claim 4.

In the fourteenth aspect of the present invention, the power supply control means is operating in the remaining small power generation equipment and is 0%.
It is characterized in that a control command in an output standby state is output.

As a result, according to the fourteenth aspect of the invention, like the invention of the fifth aspect, it is possible to quickly respond to a large change in the load power, so that the received power can be reliably kept constant. Can be held at.

Further, the invention according to claim 15 supplies the power to the power load facility in the premises by keeping the received power from the commercial power system constant and varying the generated power from the plurality of small power generation facilities. In order to do so, from the received power value measuring means for measuring the received power value (PA), the load power value measuring means for measuring the load power value (PB) used by the power load facility, and the load power value (PB) Average power obtained by subtracting the received power value (PA) to calculate the generated power value (PC) and dividing the generated power value (PC) by the number of all small power generation units (N) for multiple small power generation facilities. A power supply control means for outputting a control command for outputting a value (PF).

As a result, the invention according to claim 15 is similar to the invention according to claim 6 in that the received power is constant and the generated power is varied in accordance with the variation of the load power. There is no fear that the received power will exceed the contracted power and the power cost will be significantly high due to a large fluctuation of. Further, in the invention according to claim 15, since a small number of (N) small-sized power generation facilities are operated, it is possible to quickly respond to a large change in the load power, and to reliably keep the received power constant. Can be held.

The invention according to claim 16 is characterized in that the power supply control means outputs a control command to a plurality of small power generation facilities in parallel.

As a result, the invention according to claim 16 is capable of quick control, like the invention according to claim 7, so that it is possible to quickly cope with a large change in the load power value. Therefore, the received power value can be reliably kept constant.

According to a seventeenth aspect of the present invention, the power supply control means outputs a control command to one master small power generation facility out of a plurality of small power generation facilities, and the master small power generation facility is It is characterized in that the control command is output in parallel to another slave small-sized power generation facility.

As a result, in the invention according to claim 17, as in the invention according to claim 8, the structure of the power supply control means for outputting the control command is simplified. In addition, claim 1
In the invention according to claim 7, like the invention according to claim 8, quick control is possible, and a large change in load power can be dealt with promptly, so that the received power can be reliably kept constant. Can be held at.

The invention according to claim 18 is characterized in that the power supply control means is provided in each of the plurality of small power generation facilities, and the power supply control means of one small power generation facility among the plurality of small power generation facilities. Is a switchable master, and the power supply control means of the remaining small power generation equipment is a switchable slave.

As a result, in the invention according to claim 18, as in the invention according to claim 9, even if maintenance or failure of one or some of the power supply control means occurs, the remaining power is supplied. Since the control means can output the control command, the generated power can be reliably supplied.

The invention according to claim 19 is a program for causing a computer to function as each means of the power supply control device in the grid interconnection according to any one of claims 12 to 18. It is characterized by being.

As a result, the invention according to claim 19 causes a computer to read the program, thereby causing the computer to function as each means of the power supply control device in the grid interconnection according to any one of claims 12 to 18. You can Therefore, the invention according to claim 19 can achieve the same effect as the invention according to claims 12 to 18.

According to a twentieth aspect of the present invention, there is provided a program for causing a computer to function as each unit of the power supply control device in the grid interconnection according to any one of the twelfth to eighteenth aspects. The recording medium is a computer-readable recording medium.

As a result, the invention according to claim 20 causes the computer to read the program recorded on the recording medium, thereby causing the computer to read the program according to claim 12.
It can be made to function as each means of the power supply control device in the grid interconnection described in Nos. Therefore,
The invention according to claim 20 can achieve the same effect as the invention according to claims 12 to 18.

[0047]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, three examples of embodiments of a grid interconnection according to the present invention and a power supply control system in the grid interconnection will be described with reference to the accompanying drawings. In addition,
This embodiment does not limit the grid interconnection and the power supply control system in the grid interconnection.

(Description of Configuration of Embodiment 1) FIGS. 1 to 5
FIG. 1 is a diagram showing Embodiment 1 of a grid interconnection according to the present invention and a power supply control system in the grid interconnection.

In FIG. 1, reference numeral 1 is a commercial power system, and reference numeral 2 is a local power system including a power generation facility. The commercial power system 1 and the local power system 2 are interconnected to form a system interconnection.

The power generation equipment provided in the local power system 2 has a small output power (for example, 30 to 200 kW).
Of small power generation equipment 3-1 to 3-N. The number of installed small power generation facilities 3-1 to 3-N is
It is decided in consideration of the load power.

The small power generation facilities 3-1 to 3-N are shown in FIG.
In this example, the micro gas turbine 4 is used as shown in FIG. The micro gas turbine 4 is connected to a high speed generator 5. The high speed generator 5 is connected to a power output control unit 6. The power output control unit 6 is connected to the local power system 2. The power output control unit 6 is composed of a power converter, such as an inverter (not shown). Since the micro gas turbine 4 rotates at a high speed of about 65,000 to 90,000 rpm, the electric power output from the high speed generator 5 is about 1083 to 1500 Hz if the number of poles of the generator is two. 50 Hz or 60 in the output control unit 6
Convert power to Hz.

The indoor power system 2 is connected with a received power value measuring means 7, a load power value measuring means 8 and a plurality of power load facilities 9-1 to 9-N, respectively. A power supply control means 10 is connected to the small power generation facilities 3-1 to 3-N, the received power value measuring means 7, and the load power value measuring means 8.

The received power value measuring means 7 is, for example,
It consists of a power transducer, etc.
The received power value (PA) is measured by the current transformer 12 and the current transformer 12, and the measurement signal 13 is output to the power supply control means 10.

The load power value measuring means 8 is, for example,
It consists of an electric power transducer, etc.
The load current value (PB) is measured by the current transformer 15 and the current transformer 15, and the measurement signal 16 is output to the power supply control means 10.

The power supply control means 10 receives the received power value (PA) which is the measurement signal 13 from the received power value measuring means 7 and the load power value which is the measurement signal 16 from the load power value measuring means 8. Based on (PB), the control command signal 17 is output in parallel to the micro gas turbine 4 and the power output control unit 6 of the small-sized power generation equipment 3-1 to 3-N.

The power supply control means 10 is composed of a sequencer, a personal computer, a dedicated computer and the like. Also, the power supply control means 10
And the small power generation equipments 3-1 to 3-N communicate with analog lines (for example, 4 to 20 mA), RS422, and the like.
It is connected by a telephone line and the Internet.

Then, the power supply control means 10 keeps the received power from the commercial power system 1 constant and varies the generated power from the plurality of small power generation facilities 3-1 to 3-N. , Power is supplied to the power load facilities 9-1 to 9-N on the premises.

To this end, the power supply control means 10
First, the generated power value (PC) is calculated by subtracting the received power value (PA) from the load power value (PB).
Next, among the plurality of small power generation facilities 3-1 to 3-N,
The power generation value (PC) is 100 for one small power generation facility.
The control command of 100% output is output to the small power generation equipment of the number (M) of the integral number of the quotient divided by the power value (PD) of% output. At the same time, one small power generation facility other than the small power generation facility to which the control command of 100% output is input is used as one small power generation facility based on the generated power value (PC).
% Output power value (PD) and integer number of the quotient (M)
A control command for outputting the electric power value (PE) by subtracting the product of is output. Further, a control command for stopping is output to the remaining small power generation equipment.

The power supply control means 10 has a function of subtracting the received power value (PA) from the load power value (PB) to calculate a generated power value (PC).
The function may be made to function in a separate generated power value calculation means.

(Explanation of Operation of First Embodiment) The grid interconnection and the power supply control system in the grid interconnection according to the first embodiment are configured as described above, and their operation will be described below with reference to the flowchart of FIG. Will be described with reference to.

First, the circuit voltage detected by the instrument transformer 11 and the circuit current detected by the current transformer 12 are input to the received power value measuring means 7. The received power value measuring means 7 measures the received power value (PA) from the circuit voltage and the circuit current, and outputs the measurement signal 13 to the power supply control means 10 (S1).

On the other hand, the circuit voltage detected by the instrument transformer 14 and the circuit current detected by the current transformer 15 are input to the load power value measuring means 8. The load power value measuring means 8 measures the load power value (PB) from the circuit voltage and the circuit current, and outputs the measurement signal 16 to the power supply control means 10 (S2).

Next, the power supply control means 10 keeps the received power from the commercial power system 1 constant and changes the generated power from the plurality of small power generation facilities 3-1 to 3-N. In order to supply power to the power load equipment 9-1 to 9-N on the premises, the received power value (PB) is calculated from the load power value (PB).
The power generation value (PC) is calculated by subtracting A) (S)
3). For example, when the received power value (PA) is constant at 400 kW and the load power value (PB) is 1130 kW, the generated power value (PC) is 1130 kW-400 kW.
W = 730 kW.

Then, the power supply control means 10 selects the power generation value (P) among the plurality of small power generation facilities 3-1 to 3-N.
C) is the power value (P
A control command of 100% output is output to the small number power generation equipment (M), which is an integral number of the quotient divided by D) (S4). For example, the power value (P
If D) is set to 200 kW, the number of small power generation facilities (M) that outputs a control command of 100% output is 730 kW / 2.
Since 00 kW = 3.65, there are three units.

At the same time, the power supply control means 10
The power generation value (PC) to the power generation value (PC) of one small power generation facility (PD) and the integer quotient of one small power generation facility other than the small power generation facility that has input the control command of 100% output. Power value (P
E) Output control command is output (S5). For example, from the above example, the power value (PE) is 730 kW-20
0 kW × 3 (600 kW) = 130 kW.

Here, the load power value (PB) is 1130k.
An example in the case where the power is reduced from W to 880 kW will be described. First, the power generation value (PC) is 880 kW-400.
kW = 480 kW. Next, the number of small power generation facilities (M) that output a control command of 100% output is 480k.
Since W / 200 kW = 2.4, there are two units. Furthermore, the electric power value (PE) that outputs the control command to one small power generation facility is 480 kW-200 kW x 2 (400 k
W) = 80 kW.

The load power value (PB) is 1130 kW.
(Or 880 kW) to 1350 kW will be described as an example. First, the generated power value (PC)
Becomes 1350 kW-400 kW = 950 kW. Next, the number (M) of small-scale power generation facilities that output a control command of 100% output is 950 kW / 200 kW = 4.75, which is four. Furthermore, the electric power value (PE) that outputs the control command to one small power generation facility is 950 kW-2
It becomes 00 kW x 4 (800 kW) = 150 kW.

As described above, the grid interconnection according to the first embodiment and the power supply control system in the grid interconnection maintain the received power P1 constant and the generated power P2 as shown in FIGS. 4 and 5. It can be varied according to the variation of the load power P3. Note that FIG. 4 is an explanatory diagram showing changes in the daily load power P3 and the generated power P2 and a constant state of the received power. Further, FIG. 5 illustrates that the total demand power P4 and the generated power P2 are proportional to the load power P3, and the received power P1 is proportional to a certain value and is in a certain state when the certain value is reached. It is a figure.

(Explanation of Effects of First Embodiment) The grid interconnection and the power supply control system in the grid interconnection according to the first embodiment have the above-mentioned configuration, and the effects thereof will be described below.

In the system interconnection according to the first embodiment, a plurality of small power generation facilities 3-1 to 3-3-having a small output power value are provided.
Since N is installed, even if maintenance or failure of one or several small power generation facilities occurs, it is possible to supply power by the remaining small power generation facilities.
In addition, the grid interconnection according to the first embodiment has a large degree of freedom in layout layout when a plurality of small power generation facilities 3-1 to 3-N are installed on the premises.

Since the system interconnection according to the first embodiment is constituted by the micro gas turbine 4 as the small power generation facilities 3-1 to 3-N, the prime mover of another power generation facility, for example, a diesel engine. Comparing the cost and efficiency per unit of output power with the engine, the micro gas turbine 4 has lower cost and higher efficiency.

Further, since the power supply control system in the grid interconnection according to the first embodiment makes the received power P1 constant and the generated power P2 fluctuates according to the fluctuation of the load power P3, the load power There is no fear that the received power P1 will exceed the contracted power and the power cost will increase significantly due to the large fluctuation of P3. In addition, the power supply control system in the grid interconnection according to the first embodiment is efficient because several (M) small-sized power generation facilities are operated in rated operation. In particular, when the small-sized power generation facility is the micro gas turbine 4, the efficiency is further improved by the rated operation.

Further, since the power supply control system in the grid interconnection according to the first embodiment stops the operation of the remaining small power generation equipment, the cost is further reduced.

In the power supply control system in the grid interconnection according to the first embodiment, the remaining small power generation equipment can be in a standby state in operation and at 0% output. In this case, since it is possible to quickly respond to a large change in the load power P3, the received power P1
Can be reliably held constant.

Further, the power supply control system in the system interconnection according to the first embodiment outputs the control command from the power supply control means 10 to the plurality of small power generation facilities 3-1 to 3-N in parallel. Therefore, quick control is possible. For this reason, the power supply control system in the grid interconnection according to the first embodiment can quickly respond to a large change in the load power value, and reliably holds the received power value constant. be able to.

(Explanation of Modification of First Embodiment) FIG.
7 is a flowchart showing a modification of the operation mode of the power supply control system in the grid interconnection according to the first embodiment.

The operation modes shown in FIGS. 1 to 5 are the maximum efficiency operation mode and the standby operation mode, while the operation mode shown in FIG. 6 is the uniform power operation mode. Hereinafter, this uniform power operation mode will be described.

S11 to S13 in FIG. 6 are S1 in FIG.
~ S3 is the same. The power supply control means 10 divides the generated power value (PC) by the total number (N) of small power generation equipment 3-1 to 3-N of all the small power generation equipment 3-1 to 3-N, and the average power value (PF). An output control command is output (S14). For example, when the total number (N) of the small power generation facilities 3-1 to 3-N is 8 and the generated power value (PC) is 880 kW, the average power value (PF) is 880 kW / 8 units = 110 k.
W. The power supply control means 10 supplies an average power value (PF) of 110 kW to the eight small power generation facilities 3-1 to 3-N.
Output control command.

This uniform power operation mode is for all units (N).
Since the small power generation facilities 3-1 to 3-N are operated, it is possible to quickly respond to a large change in the load power P3, and it is possible to reliably hold the received power P1 constant.

(Explanation of Second Embodiment) FIG. 7 is an explanatory view showing a second embodiment of the power supply control system in the grid interconnection according to the present invention.

In the power supply control system in the grid interconnection according to the second embodiment, one of the plurality of small power generation facilities 3-1 to 3-N from the power supply control means 10 is the master small power generation facility 3. -1, the signal 17 of the control command is output, and the small power generation facility 3-1 of the master outputs the signal 18 of the control command in parallel to the small power generation facilities 3-2 to 3-N of the other slaves. To do.

Since the power supply control system in the grid interconnection according to the second embodiment has the above-described structure, the structure of the power supply control means 10 for outputting the control command signal 17 is simplified. In addition, the power supply control system in the grid interconnection according to the second embodiment is similar to the power supply control system in the grid interconnection according to the first embodiment, in which the master small-scale power generation facility 3-1 is another slave. Since the control command signal 18 is output in parallel to the small-sized power generation equipment 3-2 to 3-N, quick control is possible, and it is possible to quickly respond to a large change in the load power P3. Therefore, the received power P1 can be reliably kept constant.

(Explanation of Third Embodiment) FIG. 8 is an explanatory view showing a third embodiment of the power supply control system in the grid interconnection according to the present invention.

The power supply control system in the system interconnection according to the third embodiment is the power supply control means 19-1.
.About.19-N are arranged in a plurality of small power generation facilities 3-1 to 3-N, respectively. The multiple small power generation facilities 3-1 to 3
The power supply control means 19-1 of one small power generation facility 3-1 among the -N is set as a switchable master and the power supply control means 19-1 to 19-of the remaining small power generation facilities 3-2 to 3-N are used. N
Is a switchable slave.

Since the power supply control system in the grid interconnection according to the third embodiment has the above-mentioned configuration, even if maintenance or failure of one or several power supply control means occurs, the remaining power remains. Since the control command signal 20 can be output by the power supply control means, the generated power can be reliably supplied.

[0086]

As is apparent from the above, according to the system interconnection (Claim 1) of the present invention, even if maintenance or failure of one or several small power generation facilities occurs, the remaining Electric power can be supplied by a small power generation facility. Further, according to the system interconnection (claim 1) of the present invention, the degree of freedom of the layout is large when a plurality of small power generation facilities are installed on the premises.

Further, according to the system interconnection (Claim 2) of the present invention, per unit of output power of a micro gas turbine having a small output power and a prime mover of another power generation facility, for example, a diesel engine. The cost and efficiency of the micro gas turbine are lower and the efficiency is better.

Further, according to the power supply control system in the grid interconnection according to the present invention (claims 3 and 12), the received power is kept constant and the generated power is varied in accordance with the variation of the load power. There is no fear that the received power will exceed the contracted power and the power cost will increase significantly due to a large fluctuation in the load power. Further, according to the power supply control system in the grid interconnection according to the present invention (claims 3 and 12), a number of (M) small-sized power generation facilities are operated at the rated power, so that the efficiency is good. Particularly, when the small power generation facility is a micro gas turbine, the efficiency is further improved by the rated operation.

Further, according to the power supply control system in the grid interconnection according to the present invention (claims 4 and 13), since the operation of the remaining small power generation equipment is stopped, the cost is further reduced.

Further, according to the power supply control system in the grid interconnection according to the present invention (claims 5 and 14), since the remaining small power generation equipment is in operation and is in the standby state of 0% output, Since it is possible to quickly respond to a large change in electric power, the received electric power can be reliably kept constant.

Further, according to the power supply control system in the system interconnection according to the present invention (claims 6 and 15), the received power is made constant and the generated power is varied in accordance with the variation of the load power. There is no fear that the received power will exceed the contracted power and the power cost will increase significantly due to a large fluctuation in the load power. Further, according to the power supply control system in the grid interconnection according to the present invention (claims 6 and 15), since all the small number (N) of the small power generation facilities are operated, a large fluctuation of the load power can be prevented. It is possible to respond promptly, and it is possible to reliably maintain the received power at a constant level.

Further, according to the power supply control system in the grid interconnection according to the present invention (claims 7 and 16), since the control command is output in parallel to the plurality of small power generation facilities, quick control is possible. Therefore, it is possible to quickly respond to a large change in the load power, and the received power can be reliably kept constant.

Further, according to the power supply control system in the grid interconnection according to the present invention (claims 8 and 17), the control command is output to one master small power generation facility among the plurality of small power generation facilities. Moreover, since the master small-sized power generation equipment outputs the control command in parallel to the other slave small-sized power generation equipment, the configuration of the power supply control means for outputting the control command is simplified. Further, according to the power supply control system in grid interconnection according to the present invention (claims 8 and 17), quick control is possible, and it is possible to promptly respond to a large change in load power. Therefore, the received power can be reliably kept constant.

Further, according to the power supply control system in the system interconnection according to the present invention (claims 9 and 18), the power supply control means is arranged in each of a plurality of small power generation facilities, and the plurality of small power generations are arranged. Among the facilities, the power supply control means of one small power generation facility is a switchable master, and the power supply control means of the remaining small power generation facilities is a slave capable of switching, so that one or some power supply control means. Even if maintenance or failure occurs in the above, the remaining power supply control means can output the control command, and the generated power can be reliably supplied.

According to the program (Claims 10 and 19) of the present invention, by causing the computer to read the program, the power supply control method in the grid interconnection in the power supply control method in the grid interconnection can be realized. Each step can be performed. As a result, the invention according to claims 10 and 19 is
It is possible to achieve the same effects as the inventions according to claims 3 to 9 and 12 to 18.

According to the recording medium (Claims 11 and 20) of the present invention, the program recorded on the recording medium is read by the computer,
The computer can be made to execute each step of the power supply control method in the grid interconnection in the power supply control method in the grid interconnection. As a result, the invention according to claims 11 and 20 can achieve the same effect as the invention according to claims 3 to 9 and 12 to 18.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an outline of a first embodiment of a system interconnection according to the present invention and a power supply control system in the system interconnection.

FIG. 2 is likewise an explanatory view showing a small power generation facility.

FIG. 3 is likewise a flowchart showing an operation mode.

[FIG. 4] Similarly, the daily load power P3 and the generated power P
It is explanatory drawing which shows the fluctuation | variation of 2 and the fixed state of received electric power.

[FIG. 5] Similarly, the total demand power P4 with respect to the load power P3
FIG. 6 is an explanatory diagram showing that the generated power P2 is proportional, the received power P1 is proportional to a constant value, and is constant when it reaches a constant value.

FIG. 6 is a flowchart showing a uniform power operation mode.

FIG. 7 is an explanatory diagram showing an outline of a second embodiment of a power supply control system in a grid interconnection according to the present invention.

FIG. 8 is an explanatory diagram showing an outline of a third embodiment of a power supply control system in a grid interconnection according to the present invention.

[Explanation of symbols]

1 Commercial power system 2 premises power system 3-1 to 3-N Small power generation facility 4 Micro gas turbine 5 high speed generator 6 Power output controller 7 Measured power value 8 Load power value measuring means 9-1 to 9-N Power load equipment 10, 19-1 to 19-N Power supply control means 11,14 Meter transformer 12, 15 Current transformer 13, 16 Measurement signal 17, 18, 20 Control command signal PA received power value PB load power value PC power generation value PD Power value of 100% output of small power generation equipment Electric power value to output a control command to a small power generator with one PE PF average power value P1 received power P2 generated power P3 load power P4 Total power demand

Continued front page    (72) Inventor Takao Sakurai             Mitsubishi, Iwatsuka-cho, Nakamura-ku, Nagoya             Heavy Industry Co., Ltd. Nagoya Research Center (72) Inventor Susumu Kono             4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima Mitsubishi             Heavy Industry Co., Ltd. Hiroshima Laboratory F-term (reference) 5G066 HA15 HB01 HB02

Claims (20)

[Claims] 1. In a system interconnection in which a commercial power system and an in-house power system equipped with a power generation facility are interconnected, the power generation facility is composed of a plurality of small power generation facilities having a small output power. , Which is characterized by grid interconnection. 2. The grid interconnection according to claim 1, wherein the small power generation facility is composed of a small gas turbine. 3. The grid interconnection according to claim 1 or 2, wherein the received power from the commercial power system is constant, and the generated power from the plurality of small power generation facilities is changed, A method for controlling power supply to a power load facility of claim 1, wherein the received power value measuring means measures the received power value (PA) in a first step, and the load power value measuring means is used by the power load facility. A second step of measuring the load power value (PB) to be measured, and a third step in which the power supply control means calculates the generated power value (PC) by subtracting the received power value (PA) from the load power value (PB). And the power supply control means sets the generated power value (PC) to one of a plurality of small power generation equipment among the plurality of small power generation equipment.
A fourth step of outputting a control command of 100% output to a small number of power generation facilities (M) of an integral number of a quotient divided by a power value (PD) of 100% output; In one small power generation equipment other than the small power generation equipment which input the control command of% output,
From the generated power value (PC), 10
A fifth step of outputting a control command for output of an electric power value (PE) by subtracting the product of the electric power value (PD) of 0% output and the number of units (M) of the quotient. A method for controlling power supply in a characteristic grid interconnection. 4. The power supply control method in grid interconnection according to claim 3, wherein the power supply control means outputs a stop control command to the remaining small power generation equipment. 5. The grid interconnection according to claim 3, wherein the power supply control means outputs a control command in a standby state of operating and 0% output to the remaining small power generation equipment. Power supply control method in. 6. The system interconnection according to claim 1 or 2, wherein the received power from the commercial power system is constant and the generated power from the plurality of small power generation facilities is varied, A method for controlling power supply to a power load facility of claim 1, wherein the received power value measuring means measures the received power value (PA) in a first step, and the load power value measuring means is used by the power load facility. The second step of measuring the load power value (PB), and the third step in which the power supply control means calculates the generated power value (PC) by subtracting the received power value (PA) from the load power value (PB). Step, and the power supply control means outputs a control command of an average power value (PF) output obtained by dividing the generated power value (PC) by the total number (N) of the small power generation equipments to a plurality of small power generation equipments. The fourth step to do, Power supply control method in the system interconnection, characterized in that it includes. 7. The grid interconnection system according to claim 3, wherein the power supply control means outputs a control command in parallel to a plurality of small power generation facilities. Power supply control method. 8. The power supply control means outputs a control command to one master small-sized power generating equipment of a plurality of small-sized power generation equipment, and the master small-sized power generation equipment is small-sized of other slaves. The power supply control method in grid interconnection according to any one of claims 3 to 6, wherein the control command is output in parallel to power generation equipment. 9. The power supply control means is provided in each of a plurality of small power generation facilities, and the power supply control means of one of the plurality of small power generation facilities can be switched. The power supply control method in grid interconnection according to any one of claims 3 to 6, wherein the master is a master and the power supply control means of the remaining small power generation equipment is a switchable slave. 10. A program for causing a computer to execute each step of the power supply control method in the grid interconnection according to any one of claims 3 to 9. 11. A computer-readable recording medium in which a program for causing a computer to execute each step of the power supply control method in the grid interconnection according to any one of claims 3 to 9 is recorded. . 12. The grid interconnection according to claim 1 or 2, wherein the received power from the commercial power system is constant, and the generated power from the plurality of small power generation facilities is changed, And a received power value measuring means for measuring a received power value (PA), and a load power value (PB) used by the power load equipment.
And a power generation value (PC) calculated by subtracting the received power value (PA) from the load power value (PB), and a load power value measuring means for measuring the power generation value (PC). 100% of the power generation value (PC) divided by the power value (PD) of 100% output of one small power generation facility
Output the output control command, and at the same time, the above 100%
The power generation value (PC) to 100% output power value (PD) of one small power generation equipment and the integral part of the quotient to one small power generation equipment other than the small power generation equipment to which the output control command is input. Power value (P
E) A power supply control device for outputting an output control command, and a power supply control device in a grid interconnection. 13. The power supply control device for grid interconnection according to claim 12, wherein the power supply control means outputs a stop control command to the remaining small power generation equipment. 14. The grid interconnection according to claim 12, wherein the power supply control means outputs a control command in a standby state of operating and 0% output to the remaining small power generation equipment. Power supply control device in. 15. The grid interconnection according to claim 1 or 2, wherein the received power from the commercial power system is constant, and the generated power from the plurality of small power generation facilities is varied, And a received power value measuring means for measuring a received power value (PA), and a load power value (PB) used by the power load equipment.
And a power generation value (PC) that is obtained by subtracting the received power value (PA) from the load power value (PB), and a plurality of small power generation facilities that generate the power. Power supply control means for outputting a control command of an average power value (PF) output, which is obtained by dividing the power value (PC) by all the small power generation units (N), and the power in the grid interconnection characterized by the following: Supply control device. 16. The grid interconnection system according to claim 12, wherein the power supply control means outputs a control command to a plurality of small power generation facilities in parallel. Power supply control device. 17. The power supply control means outputs a control command to one master small power generation facility among a plurality of small power generation facilities, and the master small power generation facility is a small slave power generation facility of another slave. The power supply control device for grid interconnection according to any one of claims 12 to 15, wherein the control command is output in parallel to power generation equipment. 18. The power supply control means is provided in each of a plurality of small power generation facilities, and the power supply control means of one of the plurality of small power generation facilities can be switched. The power supply control device in grid interconnection according to any one of claims 12 to 15, wherein the master is a master and the power supply control means of the remaining small power generation equipment is a switchable slave. 19. A computer according to any one of claims 12 to 1.
A program for causing each unit of the power supply control device in the grid interconnection described in any one of 8 to function. 20. A computer according to any one of claims 12 to 1.
A computer-readable recording medium in which a program for functioning as each unit of the power supply control device in the grid interconnection described in any one of 8 is recorded.