High efficiency renewable energy generation global control system and control method

Abstract

To provide a high efficiency renewable energy generation global control system and control method for realizing stable supply of power while maximally using power generated by a power generator using renewable energy.SOLUTION: In a power system to which a high efficiency renewable energy generation global control system 1 is applied, a main power reception site 50 to which commercial power coming from a power plant 10 via a distribution network and power from a renewable energy generation device 508 are both supplied, and sub-power reception sites 60A to 60D to which only power of the commercial power is supplied are connected to the same distribution network. Further, efficient operation of the renewable energy generation device 508 is achieved because the renewable energy generation device 508 controls a power generation amount within a range not exceeding a total power consumption which represents the total consumption of a load 503 of the main power reception site 50 and loads 602A to 602D of the sub-power reception sites 60A to 60D.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a high-efficiency renewable energy power generation global control system and a control method, and more particularly to a high-efficiency renewable energy power generation global control system and a control method that can maximize the use of power generated by a power generation device that uses renewable energy without waste and achieve a stable supply of power. [Background technology]

[0002] In recent years, power generation devices that generate electricity using renewable energy such as solar power generation (renewable energy power generation devices), or power control systems equipped with power storage devices have become known (see, for example, Patent Document 1). Such renewable energy power generation devices are generally installed in the facilities of electricity consumers that are connected to the power grid of a commercial power system.

[0003] For example, on holidays when production facilities are not operating, the amount of power generated by the power grid and renewable energy power generation equipment exceeds the amount of power demanded. Therefore, to prevent reverse power flow from the renewable energy power generation equipment to the power grid, it is necessary to stop power generation by the renewable energy power generation equipment.

[0004] On the other hand, if renewable energy power generation equipment can be operated to generate electricity as much as possible even on holidays, it will be possible to reduce electricity bills and carbon dioxide emissions. Therefore, there are attempts to use surplus electricity generated by renewable energy power generation equipment as an emergency power source by storing it in a power storage device installed in the facility of an electricity consumer, for example. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-185016 Summary of the Invention [Problem to be solved by the invention]

[0006] However, there is a limit to the capacity of the power storage device, and when the power storage device is fully charged, it cannot store any more surplus power. In such a case, the output of the renewable energy power generation device is forcibly limited or stopped, resulting in a period when the renewable energy power generation device cannot operate, which causes a problem of not being able to effectively utilize the renewable energy power generation device.

[0007] The present invention has been devised in light of the above points, and relates to a highly efficient renewable energy power generation global control system and control method that can maximize the use of electricity generated by a power generation device that uses renewable energy, without any waste, and achieve a stable supply of electricity. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object, the high-efficiency renewable energy power generation global control system of the present invention has a main power receiving station and at least one sub-power receiving station connected to the same power grid to which commercial power is supplied, and the main power receiving station is equipped with a renewable energy power generation device that generates power using renewable energy, a main power consumption detection unit that detects the main power consumption which is the power consumption of a load in the main power receiving station, a sub-power consumption receiving unit that receives the sub-power consumption which is the power consumption of a load in the sub-power receiving station, a total power consumption calculation unit that calculates the total power consumption by adding up the main power consumption and the sub-power consumption, and a renewable energy power generation control unit that controls the power generation of the renewable energy power generation device so as not to exceed the total power consumption.

[0009] Here, a renewable energy power generation device that generates electricity using renewable energy is installed within the main power receiving station, and by generating electricity using renewable energy (for example, solar or wind power), it is possible to supply power to the load in addition to the commercial power supplied from the commercial power grid.

[0010] Furthermore, by providing a main power consumption detection unit that detects main power consumption, which is the power consumption of the loads in the main power receiving station, it is possible to detect the power consumption of the loads installed in the main power receiving station.

[0011] In addition, by providing a sub-power consumption receiving unit that receives sub-power consumption, which is the power consumption of the load within the sub-power receiving station, it is possible to receive the power consumption of the load installed within the sub-power receiving station that is connected to the same power system as the main power receiving station via communication means such as wireless.

[0012] In addition, by providing a total power consumption calculation unit that calculates the total power consumption by adding up the main power consumption and the sub-power consumption, it is possible to calculate the total amount of power consumption of the loads installed at the main power receiving station and the sub-power receiving station within the same power system.

[0013] Furthermore, by providing a renewable energy power generation control unit that controls the power generation of the renewable energy power generation device within a range that does not exceed the total power consumption, it is possible to control the power generation of the renewable energy power generation device taking into consideration not only the power consumption of the load in the main power receiving station where the renewable energy power generation device is installed, but also the power consumption of the load installed in the sub-power receiving station connected to the power grid. Therefore, even during times when the power consumption of the load in each power receiving station is low, there is no need to stop the renewable energy power generation device, and power generation can be performed efficiently by the renewable energy power generation device.

[0014] In order to achieve the above-mentioned object, the high-efficiency renewable energy power generation global control system of the present invention has a main power receiving station and at least one sub-power receiving station connected to the same power grid to which commercial power is supplied, and the main power receiving station is equipped with a renewable energy power generation device that generates power using renewable energy, a reverse flow power detection unit that detects reverse flow power that flows reversely into the power grid, a sub-power consumption receiving unit that receives sub-power consumption, which is the power consumption of a load within the sub-power receiving station, and a renewable energy power generation control unit that controls the power generation of the renewable energy power generation device so that the reverse flow power does not exceed the sub-power consumption.

[0015] Here, a renewable energy power generation device that generates electricity using renewable energy is installed within the main power receiving station, and by generating electricity based on renewable energy (for example, solar or wind power), it is possible to supply power to the load in addition to the commercial power supplied from the commercial power grid.

[0016] In addition, by providing a reverse flow power detection unit that detects reverse flow power flowing back into the power grid, it is possible to detect reverse flow power, which is the difference between the power consumed by the load in the main power receiving station and the power generated by the renewable energy power generation device.

[0017] In addition, by providing a sub-power consumption receiving unit that receives sub-power consumption, which is the power consumption of the load within the sub-power receiving station, it is possible to receive the power consumption of the load installed within the sub-power receiving station that is connected to the same power system as the main power receiving station via communication means such as wireless.

[0018] Furthermore, by providing a renewable energy power generation control unit that controls the power generation of the renewable energy power generation device so that the reverse flow power does not exceed the sub-power consumption, it is possible to control the power generation of the renewable energy power generation device so that a reverse flow to the power grid does not occur, taking into consideration not only the power consumption of the load in the main power receiving station where the renewable energy power generation device is installed, but also the power consumption of the load installed in the sub-power receiving station connected to the power grid. Therefore, even during times when the power consumption of the load in each power receiving station is low, there is no need to stop the renewable energy power generation device, and power generation can be performed efficiently by the renewable energy power generation device.

[0019] Furthermore, when a portion of the renewable energy-generated power generated by a renewable energy power generation device is supplied from the main power receiving station to a sub-power receiving station through the power grid, the renewable energy-generated power generated by the renewable energy power generation device can be supplied to the sub-power receiving station connected to the same power grid. Therefore, by distributing the reverse flow power, which is the surplus power of the main power receiving station, to the sub-power receiving station, reverse flow to the power grid can be prevented, and a stable power supply can be realized to the power receiving station connected to the power grid.

[0020] In addition, if a storage device is installed within the main power receiving station and part of the electricity generated by renewable energy is stored in the storage device, electricity can be supplied from the storage device even during a power outage when the supply of commercial electricity from the power grid is stopped, or in an emergency such as a breakdown of the renewable energy generation equipment.

[0021] Furthermore, when the power consumption of the loads within the sub-power receiving station is an instantaneous value, the minimum necessary power is supplied in accordance with the power required by the loads installed at the sub-power receiving station, so that power generation control by the renewable energy power generation equipment can achieve energy-saving operation with minimal power loss.

[0022] In order to achieve the above-mentioned object, the high-efficiency renewable energy power generation global control method of the present invention includes a step of detecting main power consumption, which is the power consumption of a load installed in a main power receiving station having a renewable energy power generation device that generates power using renewable energy; a step of detecting sub-power consumption, which is the power consumption of a load installed in a sub-power receiving station connected to the same power system as the main power receiving station; a step of calculating total power consumption by adding up the main power consumption and the sub-power consumption; and a step of controlling power generation of the renewable energy power generation device so as not to exceed the total power consumption.

[0023] Here, by including a step of detecting main power consumption, which is the power consumption of a load installed in a main power receiving station having a renewable energy power generation device that generates power using renewable energy, it is possible to detect the power consumption of the load installed in the main power receiving station.

[0024] In addition, by including a step of detecting sub-power consumption, which is the power consumption of a load installed in a sub-power receiving station connected to the same power system as the main power receiving station, it is possible to detect the power consumption of a load installed in a sub-power receiving station connected to the same power system as the main power receiving station.

[0025] In addition, by including a step of calculating the total power consumption by adding up the main power consumption and the sub-power consumption, it is possible to calculate the total amount of power consumption of the loads installed at the main power receiving station and the sub-power receiving station within the same power system.

[0026] Furthermore, by providing a step of controlling the power generation of the renewable energy power generation device within a range that does not exceed the total power consumption, the power generation of the renewable energy power generation device can be controlled taking into consideration not only the power consumption of the loads installed in the main power receiving station where the renewable energy power generation device is installed, but also the power consumption of the loads installed in the sub-power receiving stations connected to the power grid. Therefore, even during times when the power consumption of the loads in each power receiving station is low, there is no need to stop the renewable energy power generation device, and power generation can be performed efficiently by the renewable energy power generation device.

[0027] In order to achieve the above-mentioned object, the high-efficiency renewable energy power generation global control method of the present invention includes a step of detecting main power consumption, which is the power consumption of a load installed in a main power receiving station having a renewable energy power generation device that generates power using renewable energy; a step of detecting the amount of reverse flow power that flows back from the main power receiving station to a power grid; a step of detecting sub-power consumption, which is the power consumption of a load installed in a sub-power receiving station connected to the same power grid as the main power receiving station; and a step of controlling the power generation of the renewable energy power generation device so that the amount of reverse flow power does not exceed the sub-power consumption.

[0028] Here, by including a step of detecting main power consumption, which is the power consumption of a load installed in a main power receiving station having a renewable energy power generation device that generates power using renewable energy, it is possible to detect the power consumption of the load installed in the main power receiving station.

[0029] In addition, by including a process for detecting the amount of reverse flow power flowing from the main power receiving station to the power grid, it is possible to detect the reverse flow power, which is the difference between the power consumed by the load in the main power receiving station and the power generated by the renewable energy power generation device.

[0030] In addition, by including a step of detecting sub-power consumption, which is the power consumption of a load installed in a sub-power receiving station connected to the same power system as the main power receiving station, it is possible to detect the power consumption of a load installed in a sub-power receiving station connected to the same power system as the main power receiving station.

[0031] Furthermore, by providing a step of controlling the power generation of the renewable energy power generation device so that the amount of reverse flow power does not exceed the sub-power consumption, it is possible to control the power generation of the renewable energy power generation device so as not to generate a reverse power flow to the power grid, taking into consideration not only the power consumption of the load installed in the main power receiving station where the renewable energy power generation device is installed, but also the power consumption of the load installed in the sub-power receiving station connected to the power grid. Therefore, even during times when the power consumption of the load in each power receiving station is low, there is no need to stop the renewable energy power generation device, and power generation by the renewable energy power generation device can be performed efficiently. [Effects of the Invention]

[0032] The high-efficiency renewable energy power generation global control system and control method of the present invention make maximum use of the electricity generated by power generation equipment that uses renewable energy, without any waste, and can achieve a stable supply of electricity. [Brief explanation of the drawings]

[0033] [Figure 1] 1 is a diagram showing a power system according to a first embodiment of the present invention. [Figure 2] 1 is a diagram showing a high-efficiency renewable energy power generation global control system according to a first embodiment of the present invention. [Figure 3] FIG. 2 is a diagram showing a control flow of the high-efficiency renewable energy power generation global control system according to the first embodiment of the present invention. [Figure 4] FIG. 10 is a diagram showing a highly efficient renewable energy power generation global control system according to a second embodiment of the present invention. [Figure 5] FIG. 10 is a diagram showing a control flow of a high-efficiency renewable energy power generation global control system according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0034] Hereinafter, embodiments of the present invention will be described with reference to the drawings to facilitate understanding of the present invention.

[0035] [First embodiment] Fig. 1 is a diagram schematically illustrating the configuration of a power system to which a high-efficiency renewable energy power generation global control system 1 according to a first embodiment of the present invention is applied. As shown in Fig. 1, power generated in a power plant 10 is supplied from a power distribution station 20 through a power distribution network 30 to loads installed in power receiving stations, which are power consumers connected to the power distribution network 30. Furthermore, the power receiving stations connected to the same power distribution network 30 are connected by communication lines 40 to form a power control network.

[0036] The power receiving station includes a main power receiving station 50 and a plurality of sub-power receiving stations 60A to 60D connected to it. In this embodiment of the present invention, a power receiving station that includes a renewable energy power generation device 508 (a solar power generation device in this embodiment of the present invention) and receives power from the renewable energy power generation device 508 in addition to commercial power supply from the power distribution network 30 is defined as a "main power receiving station," and a power receiving station that does not include a renewable energy power generation device and only receives power supply from the power distribution network 30 is defined as a "sub-power receiving station."

[0037] In the following explanation, a case where one main power receiving station 50 exists in the power distribution network 30 will be described, but there may be multiple main power receiving stations 50. Furthermore, the renewable energy power generation device 508 installed in the main power receiving station 50 is not limited to a solar power generation device, but may be any power generation device that generates electricity using renewable energy (for example, wind power, hydropower, geothermal power, biomass, etc.).

[0038] A specific configuration of the highly efficient renewable energy power generation global control system 1 according to the embodiment of the present invention will be described based on the block diagram of FIG.

[0039] <Main power receiving station> First, the configuration of main power receiving station 50 will be described. Forward flow power detection unit 501 installed in main power receiving station 50 has the function of detecting forward flow power, which is commercial power flowing from a power plant through distribution line network 30. The forward flow power detected by forward flow power detection unit 501 is output as a signal, and the output signal is used, for example, for demand control of load 503 installed in main power receiving station 50 or for power generation control of renewable energy power generation device 508, which will be described later.

[0040] The forward flow power detection unit 501 detects the real-time instantaneous power supplied to the main power receiving station 50, and the signal output from the forward flow power detection unit 501 is a DC analog signal (DC 4 to 20 mA, or 1 to 5 V), but a wide variety of corresponding digital signals may also be used.

[0041] Here, the forward flow power detected by the forward flow power detection unit 501 does not necessarily need to be detected as real-time instantaneous power, but may be an average value over a predetermined sampling period. However, detecting the forward flow power in real time makes it possible to perform power demand control and reverse flow prevention control more accurately.

[0042] The main power consumption detection unit 504 has a function of detecting real-time power consumption (main power consumption) of the load 503 installed in the main power receiving station 50. The main power consumption detected by the main power consumption detection unit 504 is output to the total power consumption calculation unit 506 as a signal.

[0043] The sub-power consumption receiving unit 505 has a function of receiving the power consumption (sub-power consumption) of the loads 602A to 602D installed in the sub-power receiving stations 60A to 60D as a signal via the communication line 40. The signal received by the sub-power consumption receiving unit 505 is then output to the total power consumption calculation unit 506.

[0044] The main power consumption detected by the main power consumption detection unit 504 and the sub-power consumption received by the sub-power consumption receiving unit 505 are real-time instantaneous values, like the forward flow power described above, but are not necessarily limited to this, and the amount of power consumption for a specified sampling period may be output to the total power consumption calculation unit 506.

[0045] The total power consumption calculation unit 506 has the function of adding up the main power consumption and sub-power consumption received as signals to calculate the total power consumption of the load 503 of the main power receiving station 50 connected to the power distribution network 30 and the loads 602A to 602D installed in the sub-power receiving stations 60A to 60D.

[0046] In this embodiment, the total power consumption calculation unit 506 calculates the total power consumption by adding up the power consumption of the loads installed at the main power receiving station 50 and the sub-power receiving stations 60A to 60D, but this is not necessarily limited to this. For example, the total power consumption may be calculated by adding up the power consumption of the load at the main power receiving station 50 and the power consumption of the load installed in the premises of a power receiving station arbitrarily selected from the sub-power receiving stations 60A to 60D.

[0047] The renewable energy power generation device 508 is a power generation device that generates power based on renewable energy (sunlight in this embodiment of the present invention), and is composed of a solar panel 508a and a power converter 508b that converts the power generated by the solar panel 508a from direct current to alternating current and outputs the power to the load 503 via the power branching unit 502.

[0048] The amount of power generated by the solar panel 508a is detected by a renewable energy power generation amount detection unit 509 and output as a power generation amount signal. Then, the amount of power generated by the renewable energy power generation device 508 is controlled in accordance with power generation control by a renewable energy power generation control unit 507. Such power generation control by the renewable energy power generation control unit 507 will be described later.

[0049] The power storage device 510 is mainly composed of a storage battery and has the function of charging or discharging a portion of the power. For example, when the total power consumption of the loads in the power receiving station connected to the power distribution network 30 is lower than a predetermined value, a portion of the power generated by the renewable energy power generation device 508 is supplied to the power storage device 510 via the power branching unit 502, and the power is stored until it is fully charged.

[0050] The power stored in the power storage device 510 is supplied to each load from the power storage device 510 when the total power consumption of the loads is greater than a predetermined value, when commercial power cannot be supplied from the power distribution station 20 due to some kind of trouble, or when power generation by the renewable energy power generation device 508 cannot be performed. The power supplied from the power storage device 510 to each load is detected by a discharge amount detection unit 511 and output as a discharge amount signal.

[0051] Here, it is not necessarily required to install the power storage device 510. However, as described above, by providing the power storage device 510, even in the event of a problem that makes it impossible to supply power to the load, it is possible to supply power from the power storage device 510, and therefore it is preferable to install the power storage device 510 from the viewpoint of a stable power supply.

[0052] The above is the configuration of the main power receiving station 50, but for example, the sub-power consumption receiving unit 505, total power consumption calculation unit 506, and renewable energy power generation control unit 507 installed within the main power receiving station 50 may be installed outside the main power receiving station 50, and data may be sent and received between the main power receiving station 50 and the main power receiving station 50 via wireless or wired communication, which is also within the scope of the present invention.

[0053] <Sub-power receiving station> The sub-power receiving stations 60A to 60D are connected to the same power distribution network 30 as the main power receiving station 50, and in this embodiment, four sub-power receiving stations are connected.

[0054] Here, the sub-power receiving stations connected to the power distribution network 30 are not necessarily limited to the sub-power receiving stations 60A to 60D, and the number of sub-power receiving stations connected to the power distribution network 30 can be changed as desired.

[0055] Since the configurations of the sub-power receiving stations 60A to 60D are the same, for convenience of explanation, the description will be based on the sub-power receiving station 60A. First, the power flow detection unit 601A has a function of detecting the power flow power flowing from the distribution network 30 into the sub-power receiving station 60A. The power flow power detected by the power flow detection unit 601A is output as a signal, and the output signal is used, for example, for demand control for the load 602A installed in the sub-power receiving station 60A.

[0056] Similar to the main power receiving station 50, it is not necessary to detect the real-time instantaneous power of the power flow power detected by the power flow detection unit 601A of the sub-power receiving station 60A, and it may be calculated based on the average value during a predetermined sampling period.

[0057] The sub-power consumption detection unit 603A has a function of detecting the real-time power consumption (sub-power consumption) of the load 602A installed in the sub-power receiving station 60A. The sub-power consumption detected by the sub-power consumption detection unit 603A is transmitted as a signal from the sub-power consumption transmission unit 604A and received by the sub-power consumption reception unit 505 in the main power receiving station 50 described above. Then, it is used for calculating the total power consumption by the total power consumption calculation unit 506 together with the main power consumption.

[0058] The above is the configuration of the high-efficiency renewable energy power generation global control system 1 according to the first embodiment of the present invention. Next, a power control method by the high-efficiency renewable energy power generation global control system 1 will be described based on the flowchart of FIG. 3.

[0059] <STEP11: Detection of main power consumption> First, in the main power receiving station 50, the main power consumption detection unit 504 detects the power consumption of the load 503 in the main power receiving station 50. The main power consumption detected by the main power consumption detection unit 504 is signal-output and transmitted to the total power consumption calculation unit 506.

[0060] <STEP12: Detection of sub-power consumption> In the sub power receiving stations 60A to 60D, the sub power consumption detection units 603A to 603D detect the power consumption of the loads 602A to 602D in the sub power receiving stations 60A to 60D. The sub power consumption detected by the sub power consumption detection units 603A to 603D is signal - output and transmitted to the main power receiving station 50 via the communication line 40.

[0061] <STEP13: Reception of Sub Power Consumption> In STEP12, the sub power consumption output from the sub power receiving stations 60A to 60D is received by the sub power consumption receiving unit 505 of the main power receiving station 50 and further transmitted to the total power consumption calculation unit 506.

[0062] <STEP14: Calculation of Total Power Consumption> In the total power consumption calculation unit 506, the main power consumption and the sub power consumption are added together to calculate the total power consumption.

[0063] <STEP15: Renewable Energy Generation Control> The total power consumption calculated in STEP14 is transmitted to the renewable energy generation control unit 507. Then, the renewable energy generation control unit 507 instructs the renewable energy generation device 508 to perform power generation control so that the generated power amount does not exceed the total power consumption.

[0064] And the generated power generated by the renewable energy generation device 508 by the power generation control in STEP15 is supplied to the sub power receiving stations 60A to 60D through the energy storage device 510 and the distribution network 30 in the main power receiving station 50.

[0065] By repeating the above STEP11 to STEP15, the power generation amount by the renewable energy generation device 508 is controlled so as to always be less than the total power consumption of the loads installed in all the power receiving stations connected to the distribution network 30. Therefore, it is possible to prevent the reverse power flow in which the surplus power generated by the renewable energy generation device 508 flows into the power generation station 10 side and to achieve a stable power supply. Furthermore, since the renewable energy generation device 508 can always generate the optimal power generation amount without being forced to stop output, the operating efficiency of the renewable energy generation device can be increased.

[0066] [Second embodiment] Next, a high-efficiency renewable energy power generation global control system according to a second embodiment of the present invention will be described. Note that descriptions that overlap with those of the first embodiment will be omitted, and the same components will be denoted by the same reference numerals.

[0067] FIG. 4 is a block diagram of a main power receiving station 50 and sub-power receiving stations 60A to 60D to which a high-efficiency renewable energy power generation global control system 1a according to the second embodiment of the present invention is applied.

[0068] The high-efficiency renewable energy power generation global control system 1a according to the second embodiment differs from the first embodiment in that the main power receiving station 50 has a reverse flow power detection unit 512 instead of the forward flow power detection unit 501, and a total sub-power consumption calculation unit 513, which calculates the total power consumption of the loads 602A to 602D of the sub-power receiving stations 60A to 60D, instead of the total power consumption calculation unit 506 which calculates the total power consumption of all the loads of the power receiving station.

[0069] The reverse flow power detection unit 512 is the difference between the forward flow power flowing from the power plant through the distribution network 30 to the main power receiving station 50 and the amount of power generated by the renewable energy power generation device 508.If this value becomes negative, it indicates that the amount of power generated by the renewable energy power generation device 508 is in excess of the forward flow power, and a reverse flow will occur.

[0070] The power consumption of the loads 602A to 602D of the sub-power receiving stations 60A to 60D is received by the sub-power consumption receiving unit 505. Then, the total sub-power consumption calculation unit 513 calculates the total sub-power consumption by adding up the received power consumption of the sub-power receiving stations 60A to 60D.

[0071] The renewable energy power generation control unit 507 compares the reverse flow power detected by the reverse flow power detection unit 512 with the total sub-power consumption calculated by the total sub-power consumption calculation unit 513, and sends a power generation control instruction to the renewable energy power generation device 508 within a range in which the reverse flow power does not exceed the total power consumption.

[0072] The above is the configuration of the high-efficiency renewable energy power generation global control system 1a according to the second embodiment of the present invention. Next, a power control method by the high-efficiency renewable energy power generation global control system 1a according to the second embodiment will be described based on the flowchart of FIG. 5.

[0073] <STEP21: Detection of reverse power flow> First, in the main power receiving station 50, the reverse power flow detection unit 512 detects the reverse power flow in the main power receiving station 50. As described above, the reverse power flow is the difference between the power flow into the main power receiving station 50 and the power generation amount of the renewable energy power generation device 508, and the detected reverse power flow is output as a signal and transmitted to the renewable energy power generation control unit 507.

[0074] <STEP22: Detection of sub-consumption power> In the sub-power receiving stations 60A to 60D, the sub-consumption power detection units 603A to 603D detect the consumption power of the loads 602A to 602D in the sub-power receiving stations 60A to 60D. The sub-consumption power detected by the sub-consumption power detection units 603A to 603D is output as a signal and transmitted to the main power receiving station 50 via the communication line 40.

[0075] <STEP23: Reception of sub-consumption power> In STEP22, the sub-consumption power output from the sub-power receiving stations 60A to 60D is received by the sub-consumption power receiving unit 505 of the main power receiving station 50 and further transmitted to the total sub-consumption power calculation unit 513.

[0076] <STEP24: Calculation of total sub-consumption power> In the total sub-consumption power calculation unit 513, the sub-consumption powers of the loads 602A to 602D in the sub-power receiving stations 60A to 60D are totaled to calculate the total sub-consumption power. Here, when there is one sub-power receiving station among 60A to 60D, the sub-consumption power received in STEP23 is transmitted to the renewable energy power generation control unit 507 as the total sub-consumption power.

[0077] <STEP25: Renewable energy power generation control> The total sub-power consumption calculated in STEP 24 is transmitted to the renewable energy power generation control unit 507. Then, the renewable energy power generation control unit 507 instructs the renewable energy power generation device 508 to control power generation so that the amount of power generation does not exceed the total sub-power consumption.

[0078] The power generated by the renewable energy power generation device 508 through the power generation control in STEP 25 is supplied to the sub-power receiving stations 60A to 60D via the power storage device 510 in the main power receiving station 50 and the power distribution network 30.

[0079] In an embodiment of the present invention, the detected reverse flow power and total sub-power consumption are each transmitted to the renewable energy power generation control unit 507, and the difference between the reverse flow power and the total sub-power consumption is calculated in the renewable energy power generation control unit 507. However, for example, the detected reverse flow power may be transmitted to the total sub-power consumption calculation unit 513, and the total sub-power consumption calculation unit 513 may calculate the difference between the reverse flow power and the total sub-power consumption, and the calculation result may be transmitted to the renewable energy power generation control unit 507.

[0080] By repeating the above steps 21 to 25, the amount of power generated by the renewable energy power generation device 508 is controlled so that it is always below the total sub-power consumption of the loads installed in all of the sub-power receiving stations 60A to 60D connected to the power distribution network 30, thereby preventing reverse power flow in which surplus power generated by the renewable energy power generation device 508 flows into the power plant 10, and realizing a stable power supply. Furthermore, the renewable energy power generation device 508 can always generate an optimal amount of power without being forced to stop output, thereby improving the operating efficiency of the renewable energy power generation device.

[0081] As described above, the high-efficiency renewable energy power generation global control system and control method according to the present invention can maximize the use of electricity generated by power generation equipment that uses renewable energy, without any waste, thereby realizing a stable supply of electricity. [Explanation of symbols]

[0082] 1. 1a High-efficiency renewable energy power generation global control system 10. Power Plant 20 Power Distribution Station 30 Power Distribution Network 40 Communication Lines 50 Main Power Receiving Station 501 Current power detection unit 502 Power branch 503 Load 504 Main power consumption detector 505 Sub-power Receiver 506 Total power consumption calculation unit 507 Renewable energy power generation control unit 508 Renewable energy power generation equipment 508a Solar Panel 508b Power Converter 509 Renewable energy power generation detection unit 510 Electricity storage device 511 Discharge amount detection unit 512 Reverse flow power detection unit 513 Total sub-power consumption calculation unit 60A~60D Sub-receiving station 601A~601D Current power detector 602A~602D Load 603A~603D Sub power consumption detector 604A~604D Sub-power transmitter

Claims

1. A main power receiving station and at least one sub-power receiving station are connected to the same power system to which commercial power is supplied, The main power receiving station is a renewable energy power generation device that generates electricity using renewable energy; a main power consumption detection unit that detects main power consumption, which is power consumption of a load in the main power receiving station; a sub-power consumption receiving unit that receives sub-power consumption, which is power consumption of a load in the sub-power receiving station; a total power consumption calculation unit that calculates total power consumption by adding up the main power consumption and the sub power consumption; a renewable energy power generation control unit that controls the power generation of the renewable energy power generation device within a range that does not exceed the total power consumption. High-efficiency renewable energy power generation global control system.

2. A main power receiving station and at least one sub-power receiving station are connected to the same power system to which commercial power is supplied, The main power receiving station is a renewable energy power generation device that generates electricity using renewable energy; a reverse flow power detection unit that detects reverse flow power flowing in the power grid; a sub-power consumption receiving unit that receives sub-power consumption, which is power consumption of a load in the sub-power receiving station; a total sub-power consumption calculation unit that calculates a total sub-power consumption, which is the total amount of sub-power consumption received by the sub-power consumption reception unit; a renewable energy power generation control unit that controls the power generation of the renewable energy power generation device so that the reverse flow power does not exceed the total sub-power consumption. High-efficiency renewable energy power generation global control system.

3. A portion of the renewable energy generated power generated by the renewable energy power generation device is supplied from the main power receiving station to the sub-power receiving station through the power grid. The high-efficiency renewable energy power generation global control system according to claim 1.

4. The main power receiving station has a power storage device, A part of the renewable energy generated power is stored in the power storage device. The high-efficiency renewable energy power generation global control system according to claim 3.

5. The power consumption of the load in the sub-power receiving station is an instantaneous value. The high-efficiency renewable energy power generation global control system according to claim 1 or 2.

6. A step of detecting main power consumption, which is power consumption of a load installed in a main power receiving station having a renewable energy power generation device that generates power using renewable energy; detecting sub-power consumption, which is power consumption of a load installed in a sub-power receiving station connected to the same power grid as the main power receiving station; calculating a total power consumption by adding up the main power consumption and the sub power consumption; and controlling the power generation of the renewable energy power generation device within a range not exceeding the total power consumption. High-efficiency renewable energy power generation global control method.

7. A step of detecting main power consumption, which is power consumption of a load installed in a main power receiving station having a renewable energy power generation device that generates power using renewable energy; detecting an amount of reverse flow power flowing from the main power receiving station to the power grid; detecting sub-power consumption, which is power consumption of a load installed in a sub-power receiving station connected to the same power grid as the main power receiving station; and controlling the power generation of the renewable energy power generation device so that the amount of reverse flow power does not exceed the sub-power consumption. High-efficiency renewable energy power generation global control method.

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