JP2015061402A - Energy management system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an energy management system that allows using power generated by a power-generating device utilizing natural energy without the need for a specific circuit achieving cooperation with a system power network, and allows stably and continuously supplying the power generated by the power-generating device utilizing the natural energy to a load.SOLUTION: A power conditioner 12 for power generation includes an inverter 12b for converting a voltage of power outputted from power-generating means (11, 80) into a predetermined frequency with a predetermined voltage, and distortion removing means 12c or distortion preventing means 12d for removing high-frequency components from an AC voltage outputted from the inverter 12b. AC power outputted through the distortion removing means 12c or the distortion preventing means 12d can be supplied to a main line 152A separated from a system power network E.

Description

  The present invention relates to an energy management system that supplies electric power generated by natural energy to a load, charges extra power to a storage battery, or discharges the storage battery to supply electric power to a load.

  In recent years, attention has been focused on a power supply system in which a small-scale power generation device (power generation means) using natural energy such as sunlight is provided for each house and the power generated by this power generation device is supplied to the home appliance load of the house. (For example, refer to Patent Document 1).

  The power supply system of Patent Document 1 includes a solar cell panel, a PV power conditioner (a power conditioner for power generation) that converts DC power output from the solar cell panel into AC power, and a PV power conditioner. A storage battery that stores power, a storage power conditioner that converts the DC power of the storage battery into AC power and outputs it, converts AC power into DC power and charges the battery, and an external power system and PV power conditioner And a control device for controlling the distribution board, the PV power conditioner, and the storage power conditioner for supplying the AC power output from the power storage power conditioner to each home appliance load.

  This control device controls the PV power conditioner and the storage power conditioner to charge the storage battery with excess AC power output from the PV power conditioner, or to output the AC power from the PV power conditioner. When electric power alone is insufficient to supply power to the load, the storage battery is discharged, or reverse power is flown to an external power system. The storage power conditioner detects surplus power obtained by subtracting the power generation output of the solar battery from the power consumed by the household load, and performs charge / discharge control for the storage battery.

  In addition, power supply systems that have a grid-operated operation mode that operates in a grid-connected manner with a commercial AC power source and a self-sustained operation mode that operates a home appliance load with power from a solar cell or the like during a power failure are also known. (For example, see Patent Documents 2 and 3).

JP 2010-163744 A JP 2010-259170 A JP 2001-124814 A

  However, if the distortion of the voltage waveform supplied from the PV power conditioner to the storage battery, home appliance load, etc. exceeds the set value, there is a problem that a voltage higher than the rated voltage is applied to the load, so the PV power conditioner ( The operation of the power conditioner for power generation) was stopped. For this reason, there was a problem that the power generated by the power generation device using natural energy could not be stably and continuously supplied to the load.

  In addition, when a power generation device using natural energy is used separately from the grid power network, it is not necessary to connect the power generation device and the grid power network, so that a special circuit for the grid connection is not required. However, even in this case, when the distortion of the voltage waveform supplied from the PV power conditioner to the home appliance load exceeds a predetermined value, the operation of the PV power conditioner is stopped, so the power generated by the power generator is used as the load. There is a problem that it cannot be supplied stably and continuously.

  Therefore, the present invention can use the power generated by the power generator using natural energy without the need for a specific circuit for interconnection with the grid power network, and can generate power using the power generator using natural energy. An object of the present invention is to provide an energy management system capable of stably and continuously supplying power to a load.

  In order to achieve this object, the present invention includes a power generation unit that generates power using natural energy, a storage battery, a power conditioner for power generation that converts DC power output from the power generation unit into AC power, and outputs the power. AC power output from a power conditioner is converted to DC power to charge the storage battery, or DC power output from the storage battery is converted to AC power and output to the main power of the indoor distribution board An energy management system comprising a storage power conditioner, wherein the power conditioner for power generation converts an electric power voltage output from the power generation means into a predetermined wave number with a predetermined voltage, and outputs from the inverter A distortion removing means or a distortion suppressing means for removing distortion from the AC voltage of the AC power to be applied, the distortion removing means or AC power outputted via the distortion suppression means is characterized in that is provided to be supplied to the main trunk line separated from the grid power network.

  According to this configuration, it is possible to use the power generated by the power generation device using natural energy without the need for a specific circuit for interconnection with the grid power network, and to generate power using the power generation device using natural energy. Power can be supplied stably and continuously to the load.

It is explanatory drawing which showed roughly the arrangement | positioning relationship of the principal part of the energy management system of 1st Example which concerns on this invention. It is a block diagram which shows the structure of the energy management system shown in FIG. It is the block diagram which showed the structure of the control system of the energy management of FIG. It is the block diagram which showed the structure of the control system of the energy management of 2nd Example. It is the block diagram which showed the structure of the control system of the energy management of 3rd Example. It is the graph which showed the alternating voltage waveform and the reference waveform. It is the block diagram which showed the structure of the control system of the energy management of 4th Example. It is explanatory drawing which showed schematically the arrangement | positioning relationship of the principal part of the energy management system of 5th Example. It is explanatory drawing at the time of providing the switching switch and the independent distribution board indoors. It is explanatory drawing at the time of providing the switching switch of 5th Example, and the distribution board for self-supporting indoors.

  Hereinafter, an embodiment which is an embodiment of an energy management system according to the present invention will be described with reference to the drawings.

[First embodiment]
The energy management system S shown in FIG. 1 includes a photovoltaic power generation system 10, a distribution board (indoor distribution board) 20, a power storage system 40, a power measurement device (measurement device) 60, and a totalization management device (controller). 100.

  The solar power generation system 10 is a system that is arranged in a building H such as a detached house and supplies generated power to a load (home appliance load).

  First, the building H will be described. The building H is connected to a grid power network E as a power network for receiving power supply from grid power.

  The grid power grid (system power) E and the main trunk 20a wired to the building H are connected via first and second power meters (not shown). The main trunk 20a is connected to a distribution board (indoor) as shown in FIG. Distribution board) 20 is connected to the main line 20A.

  The first power meter (not shown) measures the amount of power flowing from the grid power network E to the building H, and the second power meter (not shown) measures the amount of power flowing from the building H to the grid power network E. To do. That is, the first electric energy meter integrates the purchased electric energy, and the second electric energy meter integrates the electric energy sold.

  A current sensor 31 that is a current transformer for detecting a current flowing through the main line 20A is provided in the distribution board 20. As shown in FIG. 1, a power measuring device 60 and a system controller 200 are installed in the vicinity of the distribution board 20.

  Further, as shown in FIG. 2, a main line 20B is provided in the distribution board 20, and branch lines 20b... Are connected to the main line 20B.

  The branch trunks 20b are connected to joint boxes 21 provided on the back of the ceiling of each room of the building H, and a plurality of power supply lines (not shown) are drawn from the joint box 21 and provided in the rooms. Connected to outlet 22 ... By connecting a home appliance load (not shown) to each outlet 22, electric power is supplied to the home appliance load.

  The solar power generation system 10 includes a solar power generation device (power generation means) 11 as a distributed power generation device, and a PV power conditioner (power conditioner for power generation) 12.

  This solar power generation device 11 is a device that generates power by directly converting solar energy, which is natural energy, into electric power.

  The PV power conditioner 12 converts the DC power generated by the solar power generator 11 into AC power and outputs the AC power. As shown in FIG. 3, the PV power conditioner 12 includes a DC / DC converter 12a, an inverter 12b, and distortion removing means 12c.

  The DC / DC converter 12a boosts the voltage of the DC power from the solar power generator 11 and outputs the boosted DC power. The inverter 12b outputs the DC voltage of the DC power output from the DC / DC converter 12a as the AC voltage having the same frequency and the same frequency as the commercial voltage. Furthermore, power supply lines 15 and 18 are connected to the output side of the distortion removing means 12c. The distortion removing unit 12c removes distortion of the AC voltage output from the inverter 12b to the power supply lines 15 and 18. For example, a low pass filter is used for the distortion removing unit 12c. This low-pass filter removes a high-frequency component that is distortion from the AC voltage of the AC power output from the inverter 12b.

  Moreover, the PV power conditioner 12 is connected to the storage battery 41 by the power supply line 18 so that the AC power from the PV power conditioner 12 can be supplied to the storage battery 41 in the event of a power failure. Instead of supplying AC power to the storage battery 41, an emergency outlet 13 provided in a predetermined room may be provided, and AC power may be supplied to the emergency outlet 13 via the feeder line 17 in the event of a power failure.

  The power storage system 40 converts the AC power output from the storage battery 41 and the PV power conditioner 12 to DC power to charge the storage battery 41, converts the DC power of the storage battery 41 to AC power, and outputs the power. A storage power conditioner 42 that converts AC power of the power network E into DC power and a system controller 200 are provided.

  The storage power conditioner 42 converts the DC power of the storage battery 41 into AC power based on a control signal output from the system controller 200 and detection signals output from current sensors 31 and 71 (described later) to be described later. Output from the feeder line 56 or output from the feeder line L2. The system controller 200 is omitted in FIG. 2 for convenience of explanation.

  The storage power conditioner 42 is provided in a housing 43 in which a storage battery 41 is built.

  The solar power generation device 11, the PV power conditioner 12, the storage battery 41, and the storage power conditioner 42 are provided outdoors. In addition, a distribution board (outdoor distribution board) 50 is provided outdoors. As shown in FIG. 2, the distribution board 50 is provided with a switching switch 51, a self-supporting distribution board 152, a terminal block 153, and a circuit breaker 155.

  The switching switch 51 has terminals 51a and 51b that are connected to each other by a section 51A that is a movable contact. Then, the output side of the inverter 12 b of the PV power conditioner 12 is connected to the terminal 51 b through the feeder line 15.

  In addition, a power supply line 57 connected to the main line 20 </ b> A of the distribution board 20 is connected to one terminal (not shown) of the terminal block 153. One terminal of the terminal block 153 is connected to a terminal (not shown) of the circuit breaker 155 by a connecting wire 58. One terminal of the circuit breaker 155 is connected to the main line 20 </ b> B of the distribution board 20 by a feeder line 59.

  A terminal 51a of the switching switch 51 is connected to the other terminal (not shown) of the terminal block 153 by a power supply line L1, and a terminal 51b of the switching switch 51 is connected to the storage power conditioner 42 by a power supply line L2. . Further, the other terminal (not shown) of the circuit breaker 155 is connected to the power storage power conditioner 42 by a power supply line 56.

  The section 51A of the switching switch 51 is connected to the main line 152A of the stand-alone distribution board 152, and branch lines 152B and 152B are connected to the main line 152A. The branch lines 152B and 152B are connected to joint boxes 23 and 23 in a predetermined room (for example, a living dining kitchen) of the building H by indoor wirings 54 and 55, and the joint box 23 and 23 and an outlet 24 in the predetermined room are connected to a power supply line. Connected by.

  Thereby, when the solar power generation device 11 is generating electric power and AC power is output from the inverter 12b, when the intercept 51A of the switching switch 51 is connected to the terminal 51a, the solar power generation device 11 generates power. The generated power is supplied to a home appliance load connected to an outlet 24 of a predetermined room.

  On the other hand, the AC power output from the storage power conditioner 42 includes the feeder line L2, the terminal 51b of the switching switch 51, the intercept 51A, the main line 152A, the branch lines 152B and 152B, and the indoor wiring 54 of the independent distribution board 152. , 55 and the joint boxes 23, 23 can be supplied to each outlet 24.

  Further, the AC power output from the storage power conditioner 42 is provided so as to be supplied to the main line 20 </ b> B via the feeder line 56, the circuit breaker 155, and the feeder line 59.

  When the storage battery 41 or the storage power conditioner 42 fails, the power from the grid power network E is supplied to the outlets 24 of the joint boxes 23 and 23 by switching the section 51A of the switching switch 51 to the terminal 51a. ing. This switching is performed manually.

  A part 15A of the feeder 15 is drawn into the distribution board 20, and current sensors 70 and 71 as current transformers are provided in the part 15A. Current sensors 70 and 71 detect the current output from the PV power conditioner 12. A part 15A of the feeder 15 to which the current sensors 70 and 71 are attached is a line covered with a single layer of sheath, and the current sensors 70 and 71 are attached to this part. For this reason, it is necessary to provide the current sensors 70 and 71 in the distribution board 20. The same applies to the other current sensors 31.

  The current sensor 70 (second current sensor) is a sensor for the system controller 200, and the current sensor 71 (first current sensor) is a sensor for the power measuring device 60.

  System controller 200 controls power storage power conditioner 42 based on detection signals detected by current sensors 31 and 70, operation signals from indoor remote controller 210, and the like.

  The power measuring device 60 measures the amount of power output from the solar power generation system 10 based on the detection signal detected by the current sensor 71, and wirelessly transmits the measured measurement data to the aggregation management device 100.

  The aggregation management device 100 displays the current power generated by the photovoltaic power generation system 10 based on the transmitted measurement data, the accumulated power amount, and the like on a display device (not shown).

  The totalization management device 100 is connected to an external communication network such as the Internet via the router 101, and can transmit and receive data such as measurement values to and from an external server (not shown). It can be done.

In the energy management system S of this embodiment, a distribution board 50 is installed outdoors, and a distribution board 15 in which a part 15A of a feeder 15 that connects the distribution board 50 and the PV power conditioner 12 is provided indoors. 20, and the current sensors 70 and 71 are provided in a part 15 </ b> A thereof. Therefore, the separation distance between the current sensors 70 and 71 and the system controller 200 and the power measuring device 60 provided in the vicinity of the distribution board 20. The length of the signal line drawn from the current sensor 71 to the power measuring device 60 and the length of the signal line drawn from the current sensor 70 to the system controller 200 can be set short (for example, 1.5 m or less).
[Operation]
Next, operation | movement of the energy management system S comprised as mentioned above is demonstrated easily.

  In the daytime, DC power generated by the solar power generation device 11 of the solar power generation system 10 is boosted via the DC / DC converter 12a and input to the inverter 12b. The inverter 12b converts the input DC power into AC power having a constant frequency (50 Hz or 60 Hz) with a constant voltage of 100 V and outputs the AC power.

  The AC power output from the inverter 12b is input to the distortion removing unit 12c. This distortion removing means 12c removes and outputs a high frequency component which is distortion of the AC voltage of the input AC power.

  The AC power output from the distortion removing means 12c is supplied to the plurality of outlets 24 through the feeder line 15 and the joint boxes 23 and 23 and the outlets 24 in a predetermined room, and is connected to the outlets 24. (Not shown).

  On the other hand, AC power from the grid power network E is supplied to the main line 20 </ b> B via the feeder line 57, the connecting line 58, and the feeder line 59. In addition, at the time of a power failure or the like, the power storage power conditioner 42 operates and autonomously operates. The AC power output from the storage power conditioner 42 during the autonomous operation is supplied to the main line 20B via the feeder line 56, the circuit breaker 155, and the feeder line 59. The AC power supplied to the main trunk line 20B is supplied from the branch trunk 20b of the main trunk line 20B to the outlet 22 via the joint box 21, and is supplied to a home appliance load (not shown) connected to the outlet 22. .

  In addition, the power supplied from the grid power network E to the connection line 58 of the distribution board 50 is supplied to the storage power conditioner 42 via the circuit breaker 155 and the power supply line 56, and the storage power conditioner 42 uses the excess power. The storage battery 41 is charged. The storage battery 41 is charged by the system controller 200 based on the operation of the indoor remote control device 210 and the detection signal of the current sensor 70.

  The power measurement device 60 measures the power output from the PV power conditioner 12 from the current detected by the current sensor 71, that is, the power generated by the solar power generation device 11, and transmits the measurement result to the aggregation management device 100. The totalization management device 100 displays the current power generated by the photovoltaic power generation system 10 based on the transmitted data, the accumulated power amount, and the like on a display device (not shown).

  Thus, even when the distribution board 50 and the storage battery 41 must be provided outdoors, a part 15A of the feeder 15 is drawn into the distribution board 20, and the current sensor 71 is provided in the part 15A. Therefore, the length of the signal line drawn from the current sensor 71 to the power measuring device 60 can be set short (for example, 1.5 m or less). For this reason, the detection signal detected by the current sensor 71 is communicated. Even if no means is provided, it can be input to the power measurement device 60, and the power generated by the solar power generation system 10 can be displayed on the display device.

  That is, even when the power storage system 40 is expanded by renovation so that the power generated by the solar power generation system 10 can be seen and the distribution board 50 and the storage battery 41 must be provided outdoors, the communication means can be used. Even if it is not provided, the power generated by the solar power generation system 10 can be displayed on the display device.

  In the case of nighttime, if the power charged in the storage battery 41 is converted into AC power by the storage power conditioner 42 and this AC power is output from the power supply line 56 and the power supply line L2, the AC power is converted into a circuit breaker of the distribution board 50. 155 and the feeder line 59 to the main line 20B of the distribution board 20 and the switching switch 51 to the main line 152A of the independent distribution board 152. The AC power supplied to the main trunk line 20B is further supplied from the branch trunk 20b of the distribution board 20 to the outlet 22 via the joint box 21, and is applied to household appliance loads (not shown) connected to the outlets 22. Supplied. On the other hand, the AC power supplied to the main line 152A is supplied from the branch line 152B of the stand-alone distribution board 152 to the outlet 24 via the joint box 23 and is connected to the outlet 24 (not shown). ).

  In the daytime, when a power failure occurs, the system controller 200 controls the storage power conditioner 42 to convert the DC power of the storage battery 41 into AC power, and outputs this AC power only from the power supply line L2.

  The AC power output from the feeder line L2 is supplied to each outlet 24 through the switching switch 51 of the distribution board 50, the independent distribution board 152, the indoor wirings 54 and 55, and the joint box 23. Supplied to a home appliance load (not shown) connected to 24.

  For example, the outlet 24 is provided only in the room of the living dining kitchen, and the number of outlets 24 is set to the minimum necessary, so that power is stored in a home appliance load (not shown) connected to the outlet 24. For example, AC power can be supplied from the power conditioner 42 for 24 hours.

  Moreover, when the photovoltaic power generation apparatus 11 is generating electricity in the daytime and the AC power output from the distortion removing means 12c of the PV power conditioner 12 is not used for the home appliance load, or the AC power used for the home appliance load When the amount of power is small, surplus power is generated. This surplus AC power is output to the feeder line 18 via the distortion removing means 12c. This surplus AC power is input to the power storage power conditioner 42 via the feeder line 18, and the storage battery 41 is charged by the power storage power conditioner 42. The AC power input to the storage power conditioner 42 is free from high-frequency components, which are distortions, via the distortion removing means 12c. Therefore, even when the power supply system is in the self-sustaining operation mode, The voltage waveform supplied from the battery 11 to the storage battery 41 is stable. For this reason, even in the self-sustaining operation mode, the operation of the PV power conditioner 12 is not stopped, and the power from the power generation means using natural energy is reliably supplied to the home appliance load via the power generation power conditioner. it can. For example, when the home appliance load is a storage battery, surplus power during the day can be reliably charged into the storage battery 41.

  Moreover, even when the oscillation of the output voltage from the solar power generation device 11 is large during the self-sustained operation of the solar power generation device (solar cell) 11, the inverter 12b outputs an alternating voltage with a constant voltage at a constant voltage. Thus, it is possible to prevent the storage battery 41 from being charged with electric power in the solar power generation device 11. Further, when another solar power generation device is additionally installed in the solar cell system including the already installed solar power generation device 11, the PV power conditioner is operated during the self-sustaining operation of the solar power generation device (solar cell) 11. Since the voltage oscillation in the vicinity of the zero cross point of the output voltage from the na 12 does not increase or the oscillation of the output voltage does not increase, the storage battery 41 is not charged with the electric power of the solar power generation device (solar cell) 11. You can prevent things.

When the storage battery 41 or the storage power conditioner 42 fails, the switch 51A of the switching switch 51 is switched to the terminal 51a. As a result, the power from the grid power network E passes through the feeder line 57, the terminal block 153 of the distribution board 50, the feeder line L1, the terminal 51a and the intercept 51A of the switching switch 51, and the main line 152A of the independent distribution board 152. To the outlets 24 of the joint boxes 23, 23. That is, system power can be supplied to a predetermined room.
[Second Embodiment]
FIG. 4 shows the configuration of the energy management system of the second embodiment. In this second embodiment, AC power generated by an AC power generator (power generation means) 80 using natural energy is converted into AC power at a constant voltage and a constant frequency by a PV power conditioner power conditioner (power conditioner for power generation) 12A. This is an example of conversion to. Examples of the AC power generation device 80 include a small-scale wind power generation device using wind power and a small-scale hydropower generation device using hydropower.

  The PV power conditioner 12A includes an AC / DC converter 81, a DC / DC converter 12a, an inverter 12b, and distortion removal means 12c.

  The AC / DC converter 81 converts AC power input from the AC power generator 80 into DC power and inputs the DC power to the DC / DC converter 12a. The DC / DC converter 12a boosts the input DC power voltage and inputs the boosted DC power to the inverter 12b. This inverter 12b converts the input DC power to constant frequency AC power at a constant voltage, and inputs the converted AC power to the distortion removing means 12c. The distortion removing unit 12c removes a high frequency component that is distortion from the AC voltage of the input AC power and outputs the result.

The AC power output from the distortion removing unit 12c is output to the power supply line 15 and the power supply line 18 and supplied to the home appliance load as in the first embodiment.
[Third embodiment]
FIG. 5 shows the configuration of the energy management system S of the third embodiment. In the third embodiment, the distortion suppression means 12d for removing distortion of the AC voltage output from the inverter 12b of the PV power conditioner (power conditioner for power generation) 12B is replaced with the distortion removal means 12c of the above-described embodiment. Have.

  The distortion suppression unit 12d includes a distortion detection circuit 300 that detects distortion of the voltage waveform of the AC power output from the inverter 12b, and a control circuit 310 that controls the inverter 12b based on the distortion detected by the distortion detection circuit 300. Have.

  The distortion detection circuit 300 includes a voltage waveform detection circuit 301, a reference waveform generation circuit 302, and a comparison circuit 303. This voltage waveform detection circuit 301 detects the waveform of the AC voltage of the AC power output from the inverter 12b. The reference waveform generation circuit 302 generates a sine wave reference waveform that is a reference synchronized with the AC voltage of the system power network E. The comparison circuit 303 detects distortion of the voltage waveform output from the inverter 12b by comparing the reference waveform generated by the reference waveform generation circuit 302 and the detection voltage waveform detected by the voltage waveform detection circuit 301, The distortion voltage is output as a distortion detection signal. This distortion detection signal is input to the control circuit 310.

  The control circuit 310 controls the inverter 12b so that the distortion voltage detected by the distortion detection circuit 300 from the input distortion detection signal does not exceed the threshold value Vk of FIG. 6 which is a set voltage. The threshold value Vk can be arbitrarily changed.

  Next, operations of the distortion detection circuit 300 and the control circuit 310 will be described.

  The voltage waveform detection circuit 301 detects the AC voltage waveform of the AC power output from the inverter 12b. On the other hand, the reference waveform generation circuit 302 generates a reference waveform (sine wave waveform) of an AC voltage serving as a reference synchronized with the AC voltage of the system power network E.

  The comparison circuit 303 compares the AC voltage waveform detected by the voltage waveform detection circuit 301 with the reference waveform generated by the reference waveform generation circuit 302. For example, if the AC voltage waveform detected by the voltage waveform detection circuit 301 in FIG. 6 is Vha in FIG. 7 and the reference waveform generated by the reference waveform generation circuit 302 in FIG. 6 is Vf in FIG. 7, the reference waveform Vf and the AC voltage The maximum voltage difference Vs that maximizes the difference from the waveform Vha is detected as a distortion voltage.

  The control circuit 310 detects an increase / decrease change in the difference between the reference waveform Vf and the AC voltage waveform Vha, and controls the output voltage of the inverter 12b so that the maximum voltage difference Vs does not exceed a preset setting voltage (threshold value) Vk. Control.

Thereby, the alternating voltage of the alternating current power output from the inverter 12b is supplied to the household appliance load connected to the outlet 24 and the storage power conditioner 42 without causing distortion that exceeds the maximum voltage difference Vs. Therefore, it is possible to use the power generated by the power generation device using natural energy without requiring a specific circuit for interconnection with the grid power network E, and load the power generated by the power generation device using natural energy. Can be supplied stably and continuously.
[Fourth embodiment]
FIG. 7 shows the configuration of the energy management system S of the fourth embodiment. This fourth embodiment shows a PV power conditioner (power conditioner for power generation) 12C. The AC power output from the inverter 12b of the third embodiment is passed through the distortion removing means 12c of the first embodiment. Thus, the power is supplied to the feeder lines 15 and 18. Since the operation of the distortion removing means 12c is the same as that of the first embodiment, its description is omitted.

In the third embodiment, the control circuit 310 detects an increase / decrease change in the difference between the reference waveform Vf and the AC voltage waveform Vha so that the maximum voltage difference Vs does not exceed a preset set voltage (threshold) Vk. The output voltage of the inverter 12b is controlled. At this time, when the output voltage of the inverter 12b includes a high-frequency component, the high-frequency component is removed by the distortion removing unit 12c as in the present embodiment, so that the AC power output from the inverter 12b can be stabilized more stably. It can be continuously supplied to the home appliance load or the storage power conditioner 42.
[Fifth embodiment]
FIG. 8 shows the configuration of the energy management system S of the fifth embodiment. In the fifth embodiment, a storage battery 45 and a storage power conditioner 47 are added. In the fifth embodiment, the system controller 200 shown in FIG. 9 is provided in the housing 43 of the storage battery 41, but the system controller 200 is not shown in FIG. 8 for convenience of explanation. In the fifth embodiment, since the configuration other than the storage battery 45 and the storage power conditioner 47 is the same as that of the first embodiment, the description thereof is omitted.
(Other)
Although the said Example demonstrated energy management system S provided with the solar power generation system 10, all are not restricted to this, For example, the energy management system provided with the wind power generation system may be sufficient.

  In addition, the energy management system S is provided with the current sensor 71 for the power measuring device 60 and the current sensor 70 for the system controller 200 separately, but the detection signal detected by the current sensor 71 for the power measuring device 60 The power storage power conditioner 42 and the PV power conditioner 12 may be controlled based on the above.

  In any of the above-described embodiments, the part 15A of the feeder 15 is drawn into the distribution board 20, but it is not always necessary to draw the part 15A of the feeder 15 indoors without drawing it into the distribution board 20. Good. In this case, the current sensors 70 and 71 are provided in the part 15A, and the power measuring device 60 may be disposed in the vicinity of the current sensors 70 and 71. Therefore, the power measuring device 60 is disposed in the vicinity of the distribution board 20. Therefore, a part 15A of the feeder 15 can be drawn into a desired position, and the power measuring device 60 can be arranged at a desired position.

  In each of the above embodiments, the switching switch 51, the independent distribution board 152, the terminal block 153, and the circuit breaker 155 are provided in the distribution board 50. However, as shown in FIG. The self-standing distribution board 152 may be provided indoors, and the terminal block 153 and the circuit breaker 155 may also be provided indoors. In this case, the distribution board 50 provided outdoors is unnecessary.

  In addition, when the storage battery 45 (see FIG. 8) and the storage power conditioner 47 are added as shown in the fifth embodiment, the switching switch 51 and the independent distribution board 152 are installed indoors as shown in FIG. The terminal block 153 and the circuit breaker 155 may also be provided indoors. In this case, the distribution board 50 provided outdoors is unnecessary.

  The present invention is not limited to the above-described embodiments, and design changes and additions are permitted without departing from the scope of the claimed invention.

11 Solar power generation equipment (DC power generation means, power generation means)
12 PV power conditioner
(Power conditioner for power generation)
12b Inverter 12c Distortion removing means 12d Distortion suppressing means 12c Voltage fluctuation preventing device (voltage fluctuation preventing means)
12A PV power conditioner
(Power conditioner for power generation)
12B PV power conditioner
(Power conditioner for power generation)
12C PV power conditioner
(Power conditioner for power generation)
15 Feeding line 15A Part of feeding line 15 20 Distribution board (indoor distribution board)
20a Main trunk 20b Branch trunk 24 Outlet 41 Storage battery 42 Storage power conditioner 50 Distribution board (outdoor distribution board)
60 Power measuring device (measuring device)
71 Current sensor 80 AC generator (AC generator, generator)
300 distortion detection circuit 301 voltage waveform detection circuit 302 reference waveform generation circuit 303 comparison circuit 310 control circuit

Claims (9)

A power generation means that generates power using natural energy, a storage battery, a power conditioner for power generation that converts DC power output from the power generation means into AC power, and an AC power output from the power conditioner for power generation. An energy management system comprising a storage power conditioner that converts DC power to charge the storage battery, or converts DC power output from the storage battery to AC power and outputs it to the main trunk of the indoor distribution board Because
A power conditioner for power generation includes an inverter that converts a voltage of power output from the power generation means into a predetermined wave number with a predetermined voltage, and distortion removal means that removes distortion from the AC voltage of AC power output from the inverter. Or a strain suppression means,
The energy management system is characterized in that the AC power output through the distortion removing means or the distortion suppressing means is provided so as to be supplied to a main line separated from the grid power network.   AC power output from the inverter is provided so as to be able to be supplied to the main line separated from the power grid via the distortion removing means, and a low-pass filter is used for the distortion removing means. The energy management system according to claim 1, wherein   The AC power output from the inverter is provided so as to be able to be supplied to the main line separated from the grid power network via the distortion suppression means, and the distortion suppression means is configured to supply the AC voltage output from the inverter. Based on the distortion detection circuit for detecting distortion and the distortion of the AC voltage detected by the distortion detection circuit, the inverter is controlled so that the distortion of the AC voltage output from the inverter does not exceed a set value. The energy management system according to claim 1, further comprising a control circuit. The distortion detection circuit includes:
A voltage waveform detection circuit for detecting a voltage waveform of the inverter;
A reference voltage generation circuit that generates a reference waveform of a sine wave that is a reference synchronized with the AC voltage of the system power network;
By comparing the reference waveform generated by the reference waveform generation circuit 302 with the detection voltage waveform detected by the voltage waveform detection circuit 301, the distortion voltage of the voltage waveform output from the inverter is detected, and the distortion voltage is detected. 4. The comparison circuit according to claim 3, further comprising: a comparison circuit that outputs a signal; and a control circuit that controls the distortion of the AC voltage output from the inverter based on the distortion detection signal so as not to exceed a set value. Energy management system.   5. The energy management system according to claim 3, wherein the AC power output from the inverter is provided so as to be able to be supplied to a main line separated from a system power network through a distortion removing unit.   6. The energy management system according to claim 1, wherein DC power is supplied from the power generation unit to the power conditioner for power generation.   The outdoor power distribution board which distributes the alternating current power output from the power conditioner for power generation to the storage battery and the main trunk of the indoor power distribution board is provided. The energy management system described. A current sensor for drawing a part of a feed line for transmitting AC power output from the power conditioner for power generation to the outdoor distribution board into the indoor, and detecting a current flowing through the feed line to the drawn feed line; Provided,
8. A measuring device for measuring AC power output from the power conditioner for power generation based on a current detected by the current sensor is provided in the vicinity of the indoor distribution board. The energy management system as described in one. A switching switch is provided on the outdoor distribution board,
Only a predetermined indoor outlet is connected to the switching switch,
During normal times, the power output from the power storage power conditioner is supplied to the outlet in the predetermined room via the switching switch,
9. The switch according to claim 1, wherein power is supplied from an electric power system to an outlet in the predetermined room through the switching switch by switching the switching switch when a storage battery fails. Energy management system described in 1.