JP2009124792A - Power supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power supply system which can supply power to a power consumption unit, even during an accident. <P>SOLUTION: This power supply system is equipped with a plurality of power consumption units 10-18, a plurality of power supply units 20-28, an accumulating unit 4, and a control means C, which controls at least either the power consumption units 10-18 or the power supply units 20-28. The control means C controls the operation of, at least either the power consumption units 10-18 or the power supply units 20-28, so that the total power supply amount of the power supply units 20-28 is smaller than the total power consumption amount of the power consumption units 10-18, when the amount of accumulation of an accumulating unit 4 surpasses a specified value, and controls the operation of at least either the power consumption units 10-18 or of the power supply units 20-28, so that the total power supply amount is larger than the total power consumption amount, when the amount of accumulation of the accumulating unit 4 falls below a specified value. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a power supply system including a plurality of power consumption units, a plurality of power supply units, a power storage unit, and control means for controlling the operation of at least one of the power consumption unit and the power supply unit.

  There is a power supply system including a power consumption unit, a power supply unit, and a power storage unit. For example, Patent Literature 1 describes a power supply system including a power load device as a power consumption unit, a fuel cell as a power supply unit, and a power storage device as a power storage unit. In addition, a commercial power system is also connected to the power supply system. In the power supply system described in Patent Document 1, when the power consumption of the power load device is larger than the power supply amount of the fuel cell, the shortage of power is supplied from the commercial power system and the power storage device. Further, when the power consumption amount of the power load device is smaller than the power supply amount of the fuel cell, the surplus power is supplied to the power storage device. That is, in the power supply system described in Patent Document 1, the power storage device is discharged when the power is insufficient, and the power storage device is charged when the power is surplus. I used it.

Japanese Patent Application Laid-Open No. 2004-039506

  In the above system, since the power storage device is used to balance the supply and demand of electric power, the power storage device is discharged or charged regardless of the level of the amount of power stored in the power storage device. For this reason, the battery may be charged even when the amount of electricity stored in the power storage device is too large, or may be discharged even when the amount of electricity stored is too small. The problem arises that the balance between supply and demand will be lost. In addition, if the power supply unit fails when the power storage amount in the power storage device is too small, or if the commercial power system fails, the power storage device can sufficiently cover the shortage of power consumption until the power supply unit is additionally started. There is also a problem of not.

  The present invention has been made in view of the above problems, and its purpose is to always be able to balance the supply and demand of power and to supply power to the power consuming unit even when an accident occurs. Is to provide a simple power supply system.

In order to achieve the above object, the characteristic configuration of the power supply system according to the present invention includes a plurality of power consumption units, a plurality of power supply units, and a power storage unit connected to each other, and the power consumption unit and the power supply unit. A power supply system comprising control means for controlling at least one of the operations,
The control means includes
When the power storage amount of the power storage unit exceeds a predetermined value, the power consumption unit and the power consumption unit and the power consumption unit and the power consumption unit, so that the total power supply amount of the plurality of power supply units is smaller than the total power consumption amount of the plurality of power consumption units Control the operation of at least one of the power supply units,
When the power storage amount of the power storage unit falls below a predetermined value, the power consumption unit and the power consumption unit and the power consumption unit and the power consumption unit and the power consumption unit, so that the total power supply amount of the plurality of power supply units is larger than the total power consumption amount of the plurality of power consumption units There exists the structure which controls the action | operation of at least one of an electric power supply unit.

According to the above characteristic configuration, the total power supply amount is controlled to be smaller than the total power consumption amount or the total power supply amount is larger than the total power consumption amount according to the power storage amount of the power storage unit. To be controlled. That is, when the amount of power stored in the power storage unit increases, the power storage unit operates to discharge, and when the amount of power storage decreases, the power storage unit operates to perform charging. As a result, by adjusting at least one of the power consumption amount and the power supply amount according to the power storage amount of the power storage unit, it is possible to always ensure an appropriate power storage amount of the power storage unit.
Therefore, it is possible to provide a power supply system that can always balance power supply and demand and can supply power to the power consuming unit even when a sudden accident occurs.

Another characteristic configuration of the power supply system according to the present invention is a plurality of power generation devices in which the plurality of power supply units are controlled to be in an operation state or a stop state at a set output,
The said control means is the point provided with the structure which controls the number of operation | movement of the said power generator, and adjusts the total power supply amount of these power generators.

  According to the above characteristic configuration, it is possible to always ensure an appropriate amount of power stored in the power storage unit by adjusting the number of operating power generators.

  Another characteristic configuration of the power supply system according to the present invention is that the control unit is configured such that a difference between a total power consumption amount of the plurality of power consumption units and a total power supply amount of the plurality of power generation devices is It is in the point provided with the structure which controls the number of operation | movement of the said power generator so that it may become below the said setting output.

  According to the above characteristic configuration, the number of operating power generators is adjusted so that the difference between the total power consumption and the total power supply amount, that is, the charge / discharge amount is equal to or less than the set output of the power generator. As a result, excessive charging / discharging of the power storage unit can be avoided.

  Another characteristic configuration of the power supply system according to the present invention is that the plurality of power consumption units, the plurality of power supply units, and the power storage unit are connected to each other by a common DC line.

  According to the above characteristic configuration, since the plurality of power supply units are DC-linked, the problem of synchronization is eliminated. As a result, interconnection of a plurality of power supply units is facilitated.

  Another characteristic configuration of the power supply system according to the present invention is that a commercial power system is connected to the plurality of power consumption units, the plurality of power supply units, and the power storage unit.

According to the above characteristic configuration, it is possible to compensate for the excess or deficiency of power generated from the difference between the total power consumption of the power consuming unit and the total power supply of the power supply unit from the commercial power system in addition to the power storage unit. .
Therefore, it is possible to provide a power supply system that can supply power to the power consuming unit even when the power storage unit fails.

  Another characteristic configuration of the power supply system according to the present invention is that the commercial power system is connected to the plurality of power consuming units, the plurality of power supply units, and the power storage unit through a rectifier through a common DC line. It is in the point.

  According to the above characteristic configuration, even when the commercial power system fails due to a sudden accident or the like, the synchronization problem is eliminated because the plurality of power supply units are DC-connected. As a result, interconnection of a plurality of power supply units is facilitated.

Another characteristic configuration of the power supply system according to the present invention includes a plurality of power consumption units and a power storage unit connected to each other together with a commercial power system, and at least the operation of the power consumption unit and the amount of power purchased from the commercial power system. A power supply system comprising a control means for controlling one of the two,
The control means includes
When the power storage amount of the power storage unit exceeds a predetermined value, the operation of the power consumption unit and the commercial power consumption are reduced so that the amount of power purchased from the commercial power system is smaller than the total power consumption of the plurality of power consumption units. Control at least one of the power purchases from the power grid,
When the power storage amount of the power storage unit falls below a predetermined value, the operation of the power consumption unit and the commercial power consumption are performed so that the amount of power purchased from the commercial power system is larger than the total power consumption of the plurality of power consumption units. It is in the point provided with the structure which controls at least one of the amount of electric power purchased from an electric power grid | system.

According to the above characteristic configuration, the power purchase amount is controlled to be smaller than the total power consumption amount or the power purchase amount is controlled to be larger than the total power consumption amount according to the power storage amount of the power storage unit. Or is switched. That is, when the amount of power stored in the power storage unit increases, the power storage unit operates to discharge, and when the amount of power storage decreases, the power storage unit operates to perform charging. As a result, by adjusting at least one of the power consumption amount and the power purchase amount according to the power storage amount of the power storage unit, an appropriate power storage amount of the power storage unit can always be ensured.
Therefore, it is possible to provide a power supply system that can always balance power supply and demand and can supply power to the power consuming unit even when a sudden accident occurs.

  Another characteristic configuration of the power supply system according to the present invention is that the power storage unit includes at least one of a chemical battery, a capacitor, and a flywheel.

  According to the above characteristic configuration, the power storage unit can be operated to absorb high-speed load fluctuations such as an inrush current at the time of a system power failure.

<First Embodiment>
The power supply system of the first embodiment will be described below with reference to the drawings.
FIG. 1 is a diagram illustrating the configuration of the power supply system according to the first embodiment. As shown in the figure, the power supply system is connected to each other, nine power consumption devices 10 to 18 as a plurality of power consumption units, nine power generation devices 20 to 28 as a plurality of power supply units, and Power storage device 4 as a power storage unit, and control means C for controlling the operation of at least one of power consumption devices 10 to 18 and power generation devices 20 to 28 are provided. These power consuming devices 10 to 18, the power generation devices 20 to 28, and the power storage device 4 are connected to each other via a DC line 6. An AC power source 1 such as a commercial power system is connected to the DC line 6 via a rectifier 2.

  In this embodiment, the case where a power consumption unit is comprised with the power consumption apparatus 10 as an alternating current load and the power consumption apparatuses 11-18 as a direct current load is illustrated. The power consuming apparatus 10 is connected to the DC line 6 through the circuit breaker 30 and the inverter 49. Each of the power consuming apparatuses 11 to 18 is connected to the DC line 6 via the circuit breakers 31 to 38.

  The power generators 20 to 28 are configured using a DC power generator or an AC power generator. Examples of the DC power generator include a fuel cell. Moreover, as an AC power generator, there is a gas engine power generator using a driving force of a gas engine. The power converters 40 to 48 are DC / DC converters or rectifiers. That is, each of the power generation devices 20 to 28 is connected to the DC line 6 via the circuit breakers 30 to 38 and the power converters 40 to 48.

The power storage device 4 includes at least one of a chemical battery, a capacitor, and a flywheel. In the present embodiment, a configuration in which an electric double layer capacitor (EDLC) as the power storage device 4 is connected to the DC line 6 via the DC / DC converter 5 is illustrated. Therefore, the amount of power stored in the power storage device 4 corresponds to the voltage between the output terminals of the capacitor (hereinafter also referred to as “capacitor voltage V _EDLC ”). The amount of electricity stored in the capacitor 4 is set so that the capacitor voltage V _EDLC is not less than the set lower limit voltage value V _{LL and not} more than the set upper limit voltage value V _UL so that the voltage of the DC line 6 can be properly maintained even in the event of a sudden accident. It is preferably within the voltage range. Therefore, in the present application, the following control is performed.

Based on the detection result of the voltage between the output terminals of the capacitor 4, the control means C, when the charged amount of the capacitor 4 exceeds a predetermined value (the set upper limit voltage value V _UL ), The operation of at least one of the power consumption devices 10 to 18 and the power generation devices 20 to 28 is controlled so that the total power supply amount of the plurality of power generation devices 20 to 28 is smaller than the total power consumption amount. That is, when it can be considered that the storage amount of the capacitor 4 is excessive, the control unit C is in a discharge mode for discharging the capacitor 4 and is at least one of the power consuming devices 10 to 18 and the power generating devices 20 to 28. Control the operation.

Further, when the amount of power stored in the capacitor 4 falls below a predetermined value (the set lower limit voltage value V _LL ), the control unit C determines the plurality of power generators 20 to 20 based on the total power consumption of the plurality of power consumers 10 to 18. The operation of at least one of the power consumption devices 10 to 18 and the power generation devices 20 to 28 is controlled so that the total power supply amount of 28 increases. That is, when it can be considered that the storage amount of the capacitor 4 is insufficient, the control means C is at least one of the power consumption devices 10 to 18 and the power generation devices 20 to 28 in the charging mode for charging the capacitor 4. Control the operation of

  FIG. 2 is a flowchart of the operation control of the power generator performed by the control means C. In the present embodiment, since the power is not exchanged with the AC power supply 1, the rectifier 2 is stopped.

In step 100, the control means C determines whether or not the capacitor voltage V _EDLC is within a set voltage range not less than the set lower limit voltage value V _{LL and not} more than the set upper limit voltage value V _UL . That is, the control means C determines whether or not the amount of electricity stored in the capacitor 4 is in an appropriate range.
When the capacitor voltage V _EDLC is smaller than the set lower limit voltage value V _LL (V _EDLC <V _LL ), the control means C determines that the amount of power stored in the capacitor 4 is insufficient, and shifts to step 102 in the charging mode. Start controlling. When the capacitor voltage V _EDLC is larger than the set upper limit voltage value: V _UL (V _UL <V _EDLC ), the control means C determines that the amount of power stored in the capacitor 4 is excessive, and proceeds to step 106 to perform the discharge mode. Start controlling. Further, when the capacitor voltage V _EDLC is within the set voltage range (V _LL ≦ V _EDLC ≦ V _UL ), the control means C determines that the charged amount of the capacitor 4 is within the appropriate range, and proceeds to Step 104. Transition to make a decision to maintain the current control mode (charging mode or discharging mode).

  Next, in step 108, the control means C determines whether or not the output from the capacitor 4 is within a set range that is greater than or equal to the set lower limit output value and less than or equal to the set upper limit output value. Here, the output from the capacitor 4 is a value obtained by subtracting the total power supply amount of the plurality of power generation devices 20 to 28 from the total power consumption amount of the plurality of power consumption devices 10 to 18. Therefore, if the output from the capacitor 4 is a positive value, it means that the capacitor 4 is discharged, and if the output from the capacitor 4 is a negative value, it means that the capacitor 4 is charged. To do.

  Therefore, in the charging mode, the control unit C is configured so that the total power supply amount of the plurality of power generation devices 20 to 28 is larger than the total power consumption amount of the plurality of power consumption devices 10 to 18 so that the capacitor 4 is charged. The operation of at least one of the power consumption devices 10 to 18 and the power generation devices 20 to 28 is controlled so as to increase. Further, in the discharge mode, the control means C is configured such that the total power supply amount of the plurality of power generation devices 20 to 28 is greater than the total power consumption amount of the plurality of power consumption devices 10 to 18 so that the capacitor 4 is discharged. The operation of at least one of the power consumption devices 10 to 18 and the power generation devices 20 to 28 is controlled so as to be small.

In the present embodiment, the power generators 20 to 28 are controlled to be in one of an operating state and a stopped state with a set output. For example, the power generators 20 to 28 are either operated at the rated output or stopped. When the rated outputs of the power generation devices 20 to 28 are all 300 W, the power that can be output from each of the power generation devices 20 to 28 is 0 W or 300 W.
Therefore, in order for the control means C to make the total power supply amount larger than the total power consumption amount, it is only necessary to start several power generators and increase the total power supply amount. Moreover, the control means C should just stop some power generators and make a total power supply amount small, so that a total power supply amount may become smaller than a total power consumption.

Therefore, in the discharge mode, when the output P _EDLC from the capacitor 4 is P _EDLC > 300 W (hereinafter, for simplicity, the unit W is omitted in the P _EDLC inequality), the power generator with a rated output of 300 W is used. When one or more units are started, the output from the capacitor 4 becomes 0 ≦ P _EDLC ≦ 300. For example, FIG. 3 is a diagram schematically illustrating the relationship among the total power consumption, the total power supply amount, and the charge / discharge amount of the capacitor 4 in each of the discharge mode and the charge mode. As shown in FIG. 3A, in the discharge mode, in order for the output from the capacitor 4 (in this case, “discharge”) to be 0 ≦ P _EDLC ≦ 300, two power generators must be operated. Good.

In the charging mode, when the output P _EDLC from the capacitor 4 is P _EDLC <−300, if one or more power generators with a rated output of 300 W are stopped, the output from the capacitor 4 is −300 ≦ P _EDLC ≦ 0. For example, as shown in FIG. 3B, in order for the output from the capacitor 4 (in this case, “charging”) to be −300 ≦ P _EDLC ≦ 0, three power generation devices may be operated. .

As described above, in step 108, the control means C determines whether or not −300 ≦ P _EDLC ≦ 0 in the charging mode, and whether or not 0 ≦ P _EDLC ≦ 300 in the discharging mode. Make a decision. The control means C _proceeds to step 116 when P _EDLC exceeds the upper limit value (that is, when 0 <P _EDLC in the charge mode and P _EDLC > 300 in the discharge mode). That is, when the charge amount to the capacitor 4 is insufficient in the charge mode, the number of operating power generators is increased to increase the charge amount to the capacitor 4. Further, when the discharge amount from the capacitor 4 is excessive in the discharge mode, the number of operating power generators is increased to reduce the discharge amount from the capacitor 4.

Further, the control means C, when P _EDLC exceeds the lower limit (that is, when P _EDLC <−300 in the charging mode and when P _EDLC <0 in the discharging mode), step 110 Migrate to That is, when the charge amount to the capacitor 4 is excessive in the charge mode, the number of operating power generators is decreased to reduce the charge amount to the capacitor 4. Further, when the discharge amount from the capacitor 4 is insufficient in the discharge mode, the number of operating power generators is decreased in order to increase the discharge amount from the capacitor 4.

On the other hand, the control means C, when P _EDLC is between the lower limit value and the upper limit value (that is, when −300 ≦ P _EDLC ≦ 0 in the charge mode and 0 ≦ P _EDLC ≦ 300 in the discharge mode). If yes, go to step 114.

That is, the control means C operates the power generation device so that the difference between the total power consumption of the power consumption device and the total power supply amount of the power generation device is equal to or less than the set output (for example, rated output) of the power generation device. The number is controlled. In the present embodiment, the control means C is configured so that the output P _EDLC from the capacitor 4 is 0 ≦ P _EDLC ≦ 300 in the discharge mode when the rated outputs of the power generators 20 to 28 are all 300 _W. The number of operating generators is controlled so that −300 ≦ P _EDLC ≦ 0 in the charging mode. As a result, excessive discharge or charging can be prevented.

In step 110, the control means C determines whether or not at least one power generator can be stopped. The control means C shifts to step 112 to stop when at least one power generator can be stopped, and shifts to step 114 when it cannot be stopped.
In step 116, the control means C determines whether or not at least one power generator can be started. The control means C shifts to step 118 to start when at least one power generator can be started, and shifts to step 114 when it cannot be started.
In step 114, the control means C does not newly start and stop the power generation device in order to maintain the operation state of the power generation device.

  Further, in the flowchart of FIG. 2, by controlling the operation of the power consuming devices 10 to 18, the total power supply amount becomes smaller than the total power consumption amount, or the total power supply amount becomes larger than the total power consumption amount. It may be made to become. In that case, in steps 110 to 118, the power generators 20 to 28 may be modified so as to change the power consumption of the power consuming devices 10 to 18 while the operating states of the power generators 20 to 28 remain unchanged.

FIG. 4 is a graph for explaining a change state of the capacitor voltage when the charge mode and the discharge mode are switched. As described above, when the power supply system is in the discharge mode before time t1, the control means C uses the power consuming devices 10 to 18 and the power generating devices 20 to 28 so that the total power supply amount is smaller than the total power consumption amount. In order to control at least one of the operations, the amount of power stored in the capacitor 4 decreases, and the capacitor voltage V _EDLC also decreases.
When the capacitor voltage becomes lower than the set lower limit voltage value V _{LL at} time t1, the control means C shifts the power supply system to the charging mode as described above, and the power is set so that the total power supply amount becomes larger than the total power consumption amount. The operation of at least one of the consumption devices 10 to 18 and the power generation devices 20 to 28 is controlled. As a result, the amount of power stored in the capacitor 4 increases and the capacitor voltage V _EDLC also increases. Thereafter, the control unit C, when the capacitor voltage is greater than the set upper limit voltage value V _UL at time t2, shifts the power supply system to the discharge mode.

As described above, the control unit C performs the control as described with reference to FIGS. 2 and 3 to secure the capacitor voltage V _EDLC within the set range (V _LL ≦ V _EDLC ≦ V _UL ). The voltage of the DC line 6 can be kept at an appropriate value.

Hereinafter, simulation results when the control means C performs the control shown in FIG. 2 will be described. FIG. 5 is a circuit simulating the configuration of the power supply system of FIG. 1, and simulation was performed in this circuit. The circuit shown in FIG. 5 includes a power load D that simulates an aggregate of a plurality of power consumption units (power consumption devices 10 to 18), and a direct current source that simulates a plurality of power supply units (power generation devices 20 to 28). G1-G9 and the electrical storage apparatus 4 are provided. FIG. 6 is a graph showing temporal changes in the total power consumption and the total power supply amount when the control shown in the flowchart of FIG. 2 is performed in the simulation, and FIG. 7 is a graph illustrating the capacitor voltage V _{EDLC in the} simulation. 8 is a graph showing the transition of the discharge mode and the charge mode in the simulation, and FIG. 9 is a graph showing the temporal change of the voltage _VDC of the DC line 6 in the simulation.

In the circuit of FIG. 5, the power load D is composed of a resistor R and a variable resistor R _V. The resistance R is 1156Ω, and the resistance R _V changes randomly between 48.167Ω and 289Ω only once every 5 seconds. Assuming that the voltage of the DC line 6 is 340 V, the resistance fluctuation of the power load D corresponds to a load fluctuation of 500 W to 2500 W. The DC current sources G1 to G9 operate in either an operation state or a stop state at 300 W (0.8823 A when the voltage of the DC line 6 is 340 V). The power storage device 4 includes a capacitor C _EDLC and its internal resistance R _EDLC, and is connected to the DC line 6 via a DC / DC converter 5. R _EDLC is 0.16Ω and C _EDLC is 18F. L = 7 mH and C1 = 9400 μF.
In this simulation, the set lower limit voltage value V _LL is 140 V, and the set upper limit voltage value: V _UL is 150 V. Therefore, the control means C performs control such that the capacitor voltage V _EDLC is maintained in the range of 140 ≦ V _EDLC ≦ 150.

As shown in FIG. 6, the total power consumption varies randomly, and the control means C controls the total power supply amount correspondingly. For example, the control means C operates the power supply system in the discharge mode until the time 40 seconds, so that the total power supply amount (that is, direct current) is reduced so that the total power supply amount becomes smaller than the total power consumption amount. The number of operating current sources G1 to G9) is controlled. As a result, as shown in FIG. 7, the capacitor voltage V _EDLC tends to decrease until the time of 40 seconds. Meanwhile, the voltage of the DC line 6 is maintained at 340V.
At time 40 seconds, when the total power consumption increases rapidly, the discharge amount from the capacitor 4 increases rapidly, so that the capacitor voltage becomes smaller than the set lower limit voltage value: 140V as shown in FIG. Therefore, the control means C shifts the control of the power supply system from the discharge mode to the charge mode.

When the power supply system is operated in the charging mode, the control means C controls the total power supply amount (that is, the number of operating DC current sources G1 to G9) so that the total power supply amount is larger than the total power consumption amount. To do. As a result, after the time of 40 seconds, the capacitor voltage V _EDLC shows an increasing tendency with some increase and decrease. Meanwhile, the voltage V _DC of the DC line 6 is maintained at 340V.

  As described above, from the simulation results, when the operation control of the power supply system shown in the flowchart of FIG. 2 is performed, the voltage of the DC line 6 is maintained at a constant voltage while keeping the amount of power stored in the power storage device within the set range. It has been confirmed that power can be appropriately supplied to the power consuming device.

Second Embodiment
The power supply system of the second embodiment is different from the power supply system of the first embodiment in that the AC power supply 1 and the rectifier 2 are operated and connected to the DC line 6. The power supply system of the second embodiment will be described below, but the description of the same configuration as that of the first embodiment will be omitted.

  In the power supply system according to the second embodiment, a part of necessary power is covered by any of the power generation devices 20 to 28, and the remaining necessary power is covered by power purchase from the AC power source 1 and discharge from the capacitor 4. System.

In the present embodiment, the control means C enters the discharge mode when the amount of electricity stored in the capacitor 4 exceeds a predetermined value, and the total power supply of the power generation devices 20 to 28 is calculated from the total power consumption of the power consumption devices 10 to 18. The operation of at least one of the power consuming devices 10 to 18 and the power generating devices 20 to 28 is controlled so that the amount becomes small.
Moreover, the control means C will be in charge mode, if the electrical storage amount of the capacitor 4 falls below a predetermined value, and the total power supply amount of the power generators 20 to 28 is larger than the total power consumption amount of the power consumption devices 10 to 18. As such, the operation of at least one of the power consuming devices 10 to 18 and the power generation devices 20 to 28 is controlled.
Specifically, the control unit C performs load adjustment of the power consuming devices 10 to 18, or performs output adjustment by controlling the number of the power generating devices 20 to 28, etc. The total power supply amount is reduced or increased. Note that the excess or deficiency of power generated by the difference between the total power consumption of the power consuming devices 10 to 18 and the total power supply amount of the power generating devices 20 to 28 is adjusted by the AC power supply 1 and the capacitor 4.

<Third Embodiment>
The power supply system of the third embodiment is different from the second embodiment in that the power generation devices 20 to 28 are not operated. That is, since the electric power supplied to the DC line 6 is covered by power purchase from the AC power supply 1, the power generation devices 20 to 28 need not be provided.

In the present embodiment, the control means C enters the discharge mode when the amount of power stored in the capacitor 4 exceeds a predetermined value, and the amount of power purchased from the AC power source 1 is smaller than the total power consumption of the power consuming devices 10 to 18. Thus, at least one of the operation of the power consuming devices 10 to 18 and the amount of power purchased from the AC power supply 1 is controlled.
Further, the control means C enters a charging mode when the amount of electricity stored in the capacitor 4 falls below a predetermined value, so that the amount of power purchased from the AC power source 1 is larger than the total power consumption of the power consuming devices 10 to 18. Then, at least one of the operation of the power consumption devices 10 to 18 and the amount of power purchased from the AC power source 1 is controlled.
Specifically, the control means C performs the load adjustment of the power consuming devices 10 to 18, or controls the operation of the rectifier 2 to control the amount of power purchased from the AC power supply 1, thereby calculating the total power The amount of power purchased from the AC power source 1 is made smaller or larger than the consumption.

<Another embodiment>
<1>
In the above-described embodiment, the example in which the power supply system includes nine power consuming devices, nine power generating devices, and one power storage device has been described. However, other numbers of power consuming devices, power generating devices, and power storage devices have been described. May be provided.
In addition, one power consuming unit, a power supply unit, and a power storage unit are each composed of one power consuming device, a power generation device, and a power storage device, or a plurality of power consuming devices, a power generation device, and a power storage device. There are cases where it is configured. Alternatively, the operation of multiple power generators can be simulated by changing the power supply amount of one power generator in a stepwise manner for each set output, and apparently a plurality of power supply units are configured with a single power generator. You can also

<2>
In the above embodiment, the control means C shifts to the discharge mode when the amount of electricity stored in the electricity storage unit is larger than a predetermined value (the set upper limit voltage value V _UL ), and the amount of electricity stored in the electricity storage unit is the predetermined value (above When it is smaller than the set lower limit voltage value V _LL ), it operates so as to shift to the charging mode. That is, in the above embodiment, the voltage (predetermined value) when shifting to the discharge mode is set to be different from the voltage (predetermined value) when shifting to the charging mode, but the control means C is the same. The power supply system may be switched between a discharge mode and a charge mode using a reference voltage.

For example, the control unit C is, the storage amount of the power storage device 4 exceeds the reference voltage V _R, operates the power supply system in the discharge mode, when the storage amount of the power storage device 4 falls below the same reference voltage V _R, the power supply The system may be configured to operate in a charging mode. When the amount of power stored in the power storage device 4 is equal to the reference voltage V _R , the control mode may be maintained. Further, in order to prevent hunting of the control when the discharge mode switching between the charging mode may be provided a dead zone around the reference voltage V _R.

  The power supply system according to the present invention can be used in a system that always ensures the amount of power stored in the power storage unit within an appropriate range.

The figure explaining the structure of the electric power supply system of 1st Embodiment. Flow chart of power generator operation control The figure which shows typically the relationship between the total power consumption in each of discharge mode and charge mode, total power supply, and the amount of charge / discharge of a capacitor Graph for explaining the change state of the capacitor voltage when the charge mode and the discharge mode are switched A circuit simulating the configuration of the power supply system of FIG. In simulation, the graph which shows the time change of the total electric power consumption and the total electric power supply amount when performing the control shown in the flowchart of FIG. Graph showing the change in capacitor voltage over time Graph showing transition of discharge mode and charge mode in simulation Graph showing time-dependent change in DC line voltage in simulation

Explanation of symbols

1 AC power supply (commercial power system)
4 Capacitor (power storage device, power storage unit)
6 DC lines 10-18 Power consumption device (power consumption unit)
20-28 Power generator (power supply unit)
C Control means

Claims (8)

A power supply system comprising a plurality of power consumption units, a plurality of power supply units and a power storage unit connected to each other, and a control means for controlling the operation of at least one of the power consumption unit and the power supply unit,
The control means includes
When the power storage amount of the power storage unit exceeds a predetermined value, the power consumption unit and the power consumption unit and the power consumption unit and the power consumption unit, so that the total power supply amount of the plurality of power supply units is smaller than the total power consumption amount of the plurality of power consumption units Control the operation of at least one of the power supply units,
When the power storage amount of the power storage unit falls below a predetermined value, the power consumption unit and the power consumption unit and the power consumption unit and the power consumption unit and the power consumption unit, so that the total power supply amount of the plurality of power supply units is larger than the total power consumption amount of the plurality of power consumption units A power supply system having a configuration for controlling the operation of at least one of the power supply units. The plurality of power supply units are a plurality of power generators controlled to be in an operating state or a stopped state at a set output,
2. The power supply system according to claim 1, wherein the control unit is configured to control the number of operating power generators to adjust a total power supply amount of the plurality of power generators.   The control means operates the power generator such that a difference between a total power consumption of the plurality of power consumption units and a total power supply of the plurality of power generators is equal to or less than the set output of the power generator. The power supply system according to claim 2, comprising a configuration for controlling the number.   The power supply system according to any one of claims 1 to 3, wherein the plurality of power consumption units, the plurality of power supply units, and the power storage unit are connected to each other by a common DC line.   The power supply system according to any one of claims 1 to 3, wherein a commercial power system is connected to the plurality of power consumption units, the plurality of power supply units, and the power storage unit.   The power supply system according to claim 5, wherein the commercial power system is connected to the plurality of power consuming units, the plurality of power supply units, and the power storage unit through a rectifier and a common DC line. A power supply system comprising a plurality of power consumption units and power storage units connected to each other together with a commercial power system, and a control means for controlling at least one of the operation of the power consumption unit and the amount of power purchased from the commercial power system. And
The control means includes
When the power storage amount of the power storage unit exceeds a predetermined value, the operation of the power consumption unit and the commercial power consumption are reduced so that the amount of power purchased from the commercial power system is smaller than the total power consumption of the plurality of power consumption units. Control at least one of the power purchases from the power grid,
When the power storage amount of the power storage unit falls below a predetermined value, the operation of the power consumption unit and the commercial power consumption are performed so that the amount of power purchased from the commercial power system is larger than the total power consumption of the plurality of power consumption units. An electric power supply system having a configuration for controlling at least one of the amount of power purchased from an electric power system.   The power supply system according to any one of claims 1 to 7, wherein the power storage unit includes at least one of a chemical battery, a capacitor, and a flywheel.

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