JP6307125B2 - Power management system - Google Patents

Description

  The present invention relates to a power management system that manages power by including a power amount monitoring device that measures and monitors the amount of power used, and also includes a power sale system that sells power generated by a private power generation device. .

  Electricity charges used by companies in factories, buildings, supermarkets, stores, etc. are set as basic charges and usage charges. Of these, the basic charges are determined by the amount of contract electric power determined with the electric power company. Specifically, the power consumption for 30 minutes is automatically measured every day from 0:00 to 24:00 every day throughout the year, and the maximum power consumption during this period is doubled to convert it into one hour's usage. Amount. For this reason, if a company concentrates and uses power for any 30 minutes, the amount of contracted power will increase, and if the amount of power used for 30 minutes exceeds the contracted power even though it is temporary, it will be used. The amount of electric power will be set as a new basic charge, and the basic charge will rise. In other words, even if the annual power consumption is the same or even if the average power consumption is reduced, the basic charge will increase if the power is concentrated in any 30 minutes, and the electricity charge will be Get higher. Therefore, it is necessary for a company to monitor the amount of electric power used at all times and to pay attention so as not to exceed the contracted electric energy.

  Therefore, a demand monitoring device that measures the power consumption at all times, processes and calculates the measured power value, and predicts and monitors the power consumption is installed. The demand monitoring device is a kind of power amount monitoring device, and issues a warning and alerts when it is predicted that the power used will exceed a set value. When an alarm is issued by the demand monitoring device, power saving measures are taken such as temporarily stopping the operation of the equipment and equipment, changing the set temperature of the air conditioning equipment, turning off the power, turning off the lighting, etc. The set value is not exceeded. With regard to this demand monitoring, for example, a control device described in Patent Document 1 is disclosed.

JP 2011-0104097 A

  However, conventionally, the control of the power used when an alarm is issued by a demand monitoring device has been performed by power saving measures such as stopping the operation of the device or device or changing the set temperature of the air conditioning device. As a result, these power-saving measures impose an excessive burden on employees, or those power-saving measures alone cannot provide a sufficient power-saving effect, and it is difficult to keep the power consumption below the set value. There were many things.

  Note that the above-mentioned problems are not limited to the case where the demand monitoring device does not exceed the contracted power amount determined with the power company, and the set value of the used power amount is arbitrarily set and this is monitored. It also occurs when measuring and monitoring with a device so as not to exceed.

  Therefore, the present invention is used when the power consumption supplied by the electric power company measured by the power monitoring device exceeds a set value or when the power monitoring device predicts that the power usage exceeds the set value. In addition, providing a power management system that can keep the amount of power supplied by the power company below the set value even when it is difficult to keep it below the set value only by power saving measures such as stopping the operation of equipment and devices. It is to be an issue.

The power management system according to claim 1 includes a power amount monitoring device that measures and monitors the amount of power used, and a total power sale system that sells all the power that is constantly generated by the private power generation device. In response to the amount of power used that is measured or exceeded the set value, or the amount of power that is predicted to exceed the set value, the amount of power that is generated by the private power generator and can be switched from the power for sale to the used power is It is variable between a part and all of the electric power generated by the private power generator .

The power management system according to claim 2 is generated by the private power generator when the demand monitoring device predicts that the power consumption does not exceed the contract power amount after switching from power for sale to power consumption. Part or all of the electric power is switched from electric power used to electric power for sale.

In the power management system according to claim 3 , the private power generator is a solar power generator.
In a power management system according to a fourth aspect of the present invention, the photovoltaic power generation apparatus includes a plurality of solar cell arrays, and the amount of power that can be switched from the power for selling power to the power used is variable in units of the solar cell array. is there.

According to the first aspect of the present invention, in response to a power consumption measured by a power consumption monitoring device and exceeding a set value or a power consumption predicted to exceed the set value, the private power generation device generates a power sale. Since the electric power is switched from the electric power to the used electric power, even if the amount of electric power received from the electric power company is reduced, the reduction can be supplemented with the electric power generated by the private power generator. Therefore, it is possible to keep the amount of power used below the set value even when the set value is exceeded due to power saving measures due to the shutdown of equipment and devices, etc. or because it is difficult to take power saving measures. Become.
Then, in response to the amount of power used exceeding the set value or the amount of power used predicted to exceed the set value, the amount of power generated by the private power generator and switched from the power for sale to the power used varies. Therefore, it is possible to carry out fine and optimum power management .

According to the invention of claim 2 , when it is predicted that the amount of power used does not exceed the contracted power amount after switching from the power for selling power to the power used, the power generated by the private power generator is again sold from the used power to the power sold. It can be switched to electric power, and profits from electric power sales can be obtained.

In the inventions of claims 3 and 4 , since the private power generation apparatus is a solar power generation apparatus, renewable energy can be used and a purchase system can be used.

It is a block diagram of the power management system of the embodiment of the present invention. It is a circuit diagram of the power management system of FIG. It is a circuit diagram of the power management system of FIG. It is a figure which shows the relationship of the electric energy of the power management system of FIG.

Hereinafter, a power management system according to an embodiment of the present invention will be described with reference to the drawings.
The power management system 1 is generated by a demand monitoring device 11 that always measures the amount of power used, processes and calculates the measured power value, and predicts and monitors the amount of power used, and a solar power generation device 22 as a private power generation device. When the demand monitoring device 11 predicts that the power used exceeds the contracted power amount, a part or all of the power generated by the private power generator is sold. The power is switched from working power to working power. Hereinafter, each component will be described.

  The demand monitoring device 11 is a kind of power amount monitoring device, and the contracted power amount is obtained by using the power by concentrating basic charges among electric charges used by companies in factories, supermarkets, etc. for an arbitrary 30 minutes. To prevent electricity charges from rising. Specifically, the demand monitoring device 11 is equipped with a power meter at a power receiving point of each business site, and measures the amount of power used per minute for each business site. The data is transmitted to the data center by wire or wireless through the Internet line. Therefore, the data center performs data processing, calculation, and analysis based on the transmitted measurement values, and predicts the power consumption after 30 minutes. The data center also records these data and performs data processing such as making a bar graph. These data are transmitted to the demand monitoring apparatus 11 of each office by wired or wireless via an intra-office LAN and router through the Internet line. Thereby, the transition of the electric power consumption can also be confirmed in real time at each business office.

  When it is predicted that the power consumption exceeds the set value, the demand monitoring device 11 issues a warning to a factory, a store, etc., as shown in FIG. For the alarm, for example, red, yellow, and blue three-color indicator lamps can be installed at various locations in the factory or in the store, and the degree of urgency can be notified by the displayed color. Alternatively, a warning can be given by a siren. When an alarm is issued, employees, shop assistants, etc., who have confirmed the alarm, take measures to temporarily stop the operation of the equipment and equipment, change the set temperature of the air conditioner or stop the operation, and turn off the light. Is done.

  Further, the demand monitoring device 11 not only simply measures and monitors and issues an alarm, but also automatically performs demand control such as temporarily stopping the operation of the device and device, changing the set temperature of the air conditioning device, or stopping the operation. Also, load control is performed.

  In addition, as shown in FIGS. 1 to 3, the demand monitoring device 11 issues a switching command to a switching switch 25 described later of the solar power generation device 22.

  Next, the solar power generation device 22 as a private power generation device is a power generation device that directly converts solar energy into electric power. As shown in FIGS. 2 and 3, the solar power generation device 22 includes a plurality of 10 kW solar cell arrays 23 of solar cell panels, a connection box 24, a switching switch 25, a power conditioner 26, and an AC collecting box 27. A safety breaker 28 and a watt-hour meter 29 for selling electricity. In the solar power generation device 22, electricity generated in the solar cell panel is collected in the connection box 24 and supplied to the power conditioner 26. The power conditioner 26 adjusts the input voltage to a stable output with a constant voltage, and converts the generated electricity so that it can be used in an environment such as a factory or a store. In the circuits shown in FIGS. 2 and 3, the electricity generated in the solar cell array 23 of the solar cell panel is a direct current, and is converted into an alternating current by the power conditioner 26. And the electricity output from the power conditioner 26 is sent to the outside through the watt-hour meter 29 for power sale as the power sale by the whole quantity purchase system. In FIGS. 2 and 3, the power conditioner is displayed as “power conditioner”.

  Furthermore, in the circuit of the solar power generation device 22, when the switching signal is transmitted from the demand monitoring device 11 and the switching switch 25 receives it, one of the three solar cell arrays 23 is shown in FIG. The electric power generated in each of the first solar cell arrays 23a is switched by the switching switch 25 and supplied to the fourth power conditioner 26d, and is consumed at the office as a general load.

Here, a system for selling power generated by the solar power generation device 22 will be described.
There are a surplus purchase system and a full quantity purchase system. The surplus purchase system is a purchase system that is applied to a power generation system with a photovoltaic power generation capacity of less than 10 kW, mainly in ordinary households. is there. This purchase system is applicable even if the power generation capacity exceeds 10 kW. However, since the full quantity purchase system, which will be described later, which was newly enforced for industrial use from July 1, 2012, is more economically advantageous, Most companies that exceed 10 kW are expected to apply the full purchase system.

  The total quantity purchase system is a system that can sell all the electric power generated by the solar power generation device 22 to an electric power company, and can use the electric power of the electric power company at low cost. The price of private power generation and selling to a power company is slightly higher than when the surplus purchase system is applied. Therefore, it is possible to recover the investment cost of the solar power generation device 22 in a short time as compared with the surplus purchase system. The purchase period is 20 years, twice that of the surplus electricity system. For these reasons, the full purchase system is much more advantageous for companies than the surplus purchase system.

  The total purchase system is a system in which self-generated electricity can be sold regardless of the surplus of power after self-consumption, and all the sold power is purchased. It's not that you have to sell electricity.

Next, the use of power in the power management system 1 of the embodiment of the present invention configured as described above will be described.
In the monitoring of the power consumption by the demand monitoring device 11, while it is predicted that the amount of power supplied from the power company does not exceed the set value that is the contract power amount, as shown in FIG. The electric power generated by the first to third solar cell arrays of the power generator 22 is collected in the connection box 24, then supplied to the first to third power conditioners, collected in the alternating current collection box 27, and then used for power sale. Electricity is sold from the dynamometer 29 to the power company.

  On the other hand, in the monitoring of the power usage by the demand monitoring device 11, when it is predicted that the power usage amount exceeds the set value, as shown in FIG. 3, the second solar cell array 23b of the solar power generation device 22 and The electric power generated by the third solar cell array 23c is collected in the connection box 24, supplied to the second power conditioner 26b and the third power conditioner 26c, collected in the alternating current collection box 27, and then sold for power sale. Electricity is sold from the dynamometer 29 to the power company.

  On the other hand, a switching signal is transmitted from the demand monitoring device 11 to the switching switch 25 of the first solar cell array 23 a of the solar power generation device 22. Therefore, the switching switch 25 that has received the switching signal supplies the power generated by the first solar cell array 23a to the fourth power conditioner 26d. Furthermore, the electric power supplied to the fourth power conditioner 26d is switched to the electric power supply from the solar power generator 22 in preference to the electric power supply of the electric power company, and is used as the electric power consumption to the general load of the office. At this time, demand control and load control by the demand monitoring device 11 are automatically performed, and power saving measures such as output control or ON / OFF control of the air-conditioning equipment and the like and turning off are automatically performed. However, when the demand monitoring device 11 predicts that the contracted power amount is exceeded and issues an alarm, the worker, the store clerk, etc. confirm this and manually perform power-saving measures such as output control or turning off the air conditioning equipment. It may be.

  In the subsequent monitoring of power usage by the demand monitoring device 11, it was predicted that the power usage would once exceed the contract power, but as a result of power saving measures, the power usage was predicted not to exceed the contract power. Sometimes, a return signal is transmitted to the switching switch 25 of the first solar cell array 23a of the solar power generation device 22. Therefore, the switching switch 25 that has received the return signal supplies the power generated by the first solar cell array 23a from the fourth power conditioner 26d to the original first power conditioner 26a. Thereby, after the electric power generated with the 1st-3rd solar cell array is gathered again in each connection box 24 like the original, it is supplied to the 1st-3rd power conditioner, and the 1st-3rd solar cell array After all the electric power generated in the above is collected in the alternating current collection box 27, the electricity is sold from the watt-hour meter 29 for power sale to the electric power company.

  In addition, by giving priority to private power generation by the solar power generation device 22, power saving measures such as output control or ON / OFF control and turn-off of air conditioning equipment can be reduced as much as possible, and further, they can be used for these. If all the amount of electric power can be covered by in-house power generation, adjustment of the air conditioning equipment or the like can be made unnecessary.

Here, the relationship between the amount of power used and the amount of power purchased when it is predicted that the amount of power used will exceed the set value in the monitoring of power used by the demand monitoring device 11 will be described.
As shown in FIG. 4, “power consumption W1” = “power consumption W2 supplied by the power company” + “self-use power W6” at the office. At this time, “used electric energy W2 supplied by the electric power company” <“contracted electric energy W3”, and the used electric energy W2 is maintained below the contracted electric energy W3. On the other hand, “power generation amount W4 by the private power generation device” = “power sales amount W5 by the total purchase system” + “private power consumption W6”.

Next, the operation of the power management system 1 according to the embodiment of the present invention will be described.
When the demand monitoring device 11 predicts that the power used will exceed the set value, a part or all of the power generated by the solar power generator 22 is switched from the power for sale to the power used. Even if the amount of electric power is reduced, the reduction can be supplemented with the electric power generated by the solar power generation device 22. Therefore, the required power saving effect cannot be obtained only by power saving measures such as output control of equipment and devices, stoppage of operation, etc., or it is difficult to take power saving measures by forcing employees etc. Even when there is a risk of exceeding the contracted power amount, it can be used as a general load by replenishing power by the solar power generation device 22 of the total amount purchase system 21, so that the power supplied from the power company The power consumption can be kept below the contract power consumption.

  Here, the electricity price is examined. When a part or all of the power generated by the solar power generation device 22 is switched from the power for sale to the power used by the demand monitoring device 11, the entire amount of power generated by the solar power generation device 22 is sold. The amount of power sold is reduced by the amount of power switched to the power used. However, it is necessary to switch the electric power generated by the solar power generation device 22 to the electric power used during a short period of summer and winter. On the other hand, once the basic charge of the electricity bill is changed to a higher amount once the amount of power used exceeds the set value of the contract power, the amount is maintained for one year. Therefore, when comparing the case where a part or all of the power generated by the solar power generation device 22 is switched from the power for sale to the power used and the case where it is not switched, the basic charge is changed from the power for sale to the power used. If the rise is suppressed, the electricity charge will be lower overall, leading to cost reduction.

  By the way, in the said embodiment, when it is estimated by the demand monitoring apparatus 11 that electric power used exceeds a setting value, as shown in FIG. 3, a switching signal is transmitted to the switching switch 25 of the 1st solar cell array 23a, Only the electric power generated by the first solar cell array 23a is supplied to the fourth power conditioner 26d and used in the office as a general load. However, the power consumption is not limited to this, and the power used by the demand monitoring device 11 is set to the set value. When predicted to greatly exceed, the switching signal is transmitted to the second solar cell array 23b and further to the switching switch 25 of the third solar cell array 23c in addition to the first solar cell array 23a. The power generation amount of the battery array 23b and further the third solar cell array 23c may be supplied as the power used for the general load. In this case, since the power generation amount of the second solar cell array 23b or further the third solar cell array 23c is also supplied and supplemented to the private power, the amount of power supplied from the power company can be reduced accordingly. Therefore, even when the power consumption is predicted to greatly exceed the set value, the contract power setting can be performed by supplementing the power of the second solar cell array 23b or further the third solar cell array 23c without taking excessive power saving measures. Can be kept below the value.

  That is, the power value generated by the solar power generation device 22 and switched from the power for sale to the used power can be varied corresponding to the power value predicted by the demand monitoring device 11 to exceed the contracted power amount. It can also be.

  Note that the switching to the time when the demand monitoring device 11 predicts that the power consumption exceeds the contracted power amount is automatically performed when the demand monitoring device 11 predicts that the power consumption exceeds the contract power consumption. The switching signal is transmitted from the demand monitoring device 11 and the switching switch 25 is switched to the fourth power conditioner 26d side. However, the present invention is not limited to this, and the operation is performed when the demand monitoring device 11 issues an alarm. An employee, a store clerk, or the like may manually switch to the fourth power conditioner 26d side.

  In addition, the switching from the power for selling to the power to be used is normally performed simultaneously with power saving measures such as issuing an alarm by demand control of the demand monitoring device 11 or device control, but may be performed at different times. . For example, when a slightly lower initial set value that is predicted to exceed the contracted power amount is exceeded, switching to the power used by the private power generator is performed, and after that it is still insufficient and the last higher When the set value is exceeded, an operation of demand control by the demand monitoring device 11 may be started. The set value here can be set arbitrarily.

  Furthermore, in the said embodiment, since the 4th power conditioner 26d may convert the direct current generated with the solar cell array 23 into 100V, and may convert into three-phase 200V, The same specification may be sufficient and another specification may be sufficient.

  In addition, the setting value of the said embodiment can also be arbitrarily set from other viewpoints, such as an energy saving other than the said setting value estimated and set that it exceeds contract electric energy and contract electric energy.

  In addition, in the above-described embodiment, the case where the electric power generated by the solar power generation apparatus 22 is sold by the total amount purchase system is sold as the electric power sale. However, the electric power is sold by the purchase system of partial purchase instead of the total amount. It can be applied to things as well.

  Furthermore, in the said embodiment, although the solar power generation device 22 is provided as a private power generation device, it is not limited to this, As shown in FIG.2 and FIG.3, a lithium ion battery etc. are included in a circuit. The storage battery 30 may be attached. In this case, electricity can be supplied from both the solar power generation device 22 and the storage battery 30 or only from the storage battery 30 depending on the timing.

DESCRIPTION OF SYMBOLS 1 Power management system 11 Demand monitoring apparatus 21 Total power sale system 22 Solar power generation device 23 Solar cell array 25 Switching switch

Claims (4)

An energy monitoring device that measures and monitors the amount of power used; and
With a full-volume power selling system that sells all of the power that is constantly generated by the private power generator,
Corresponding to the amount of power used that is measured by the power amount monitoring device and exceeds the set value, or the amount of power that is predicted to exceed the set value, the power generated from the private power generation device is changed from the power for sale to the power used. An electric power management system, wherein the amount of electric power to be switched varies between a part and all of electric power generated by the private power generator . When the demand monitoring device predicts that the amount of power used does not exceed the contracted power amount after switching from the power for sale to the power used, use part or all of the power generated by the private power generator The power management system according to claim 1 , wherein the power is switched from electric power to electric power for sale. The private power generation device, the power management system of claim 1 or claim 2, characterized in that a photovoltaic power generator. The solar power generation device includes a plurality of solar cell arrays,
The power management system according to claim 3 , wherein the amount of power switched from the power for selling power to the power used is variable in units of the solar cell array.

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