JP2019041520A - Electric power unit, power supply control arrangement - Google Patents

Abstract

To operate without waste during both normal time and momentary voltage drop time, even if the inverter capacity is increased, and to ensure electric energy of a load system, by securing the voltage with no delay during momentary voltage drop time.SOLUTION: In normal state, a load system 10 is supplied with power from a commercial power supply 14, the power generated in a solar power generation device 20 is sent to a power supply 16 for inverse load flow, and is sold. During lightning prediction, power supply from the commercial power supply 14 is continued, but inverse load flow is not executed, and an inverter 18 is in stand-by state where power can be supplied quickly from a power storage device 22. During occurrence of momentary voltage drop, the inverter 18 supplies the power discharged from the power storage device 22 to the load system 10, and the load system 10 can continue utilization while keeping a target voltage, even if the voltage drops momentarily.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a power supply device and a power supply control device for continuously supplying power to a load facility when an instantaneous voltage drop caused by a lightning strike or the like.

  Patent Document 1 discloses an uninterruptible power supply device that reliably detects a power failure of a commercial power source and performs a storage battery operation without unnecessarily performing a storage battery operation due to an instantaneous voltage drop (sometimes referred to as an instantaneous voltage drop). UPS “Uninterruptible Power Supply”).

  In Patent Document 1, a rectifier that converts AC power from a commercial AC power source into DC power, an inverter that converts DC power into AC power and supplies it to a load facility, a storage battery connected therebetween, and a commercial power source Is provided for detecting abnormalities in the AC power input from, for example, the frequency fluctuation (frequency maintenance at the time of instantaneous voltage drop, frequency 0 at the time of power failure). It is described that the voltage is compensated by increasing the current allowable limit to preserve the storage battery. That is, when the instantaneous voltage drop is maintained within the predetermined frequency fluctuation range, the storage battery is applied only at the time of a power failure by distinguishing whether the cause of the voltage drop is an instantaneous voltage drop or a power failure. be able to.

  Patent Document 2 describes an instantaneous voltage drop detection device that detects an instantaneous voltage drop of a power system at a high speed and stops an inverter.

  Patent Document 2 includes a system voltage level drop detection unit that detects that the system voltage has reached a predetermined voltage level, and a detection duration measurement unit that measures the detection duration of the detection unit, and detects a level drop. When the measurement time is equal to or longer than the predetermined time, an instantaneous voltage drop is detected. As a result, the photovoltaic power generation device can be protected from the inverter overcurrent caused by the instantaneous voltage drop.

  For reference, Patent Document 3 describes that, even when an instantaneous voltage drop occurs, the uninterruptible power supply device continues to output power from the solar power generation device from the power conditioner.

  Patent Document 4 describes that when the AC power system after a power failure is restored, the frequency of the commercial power supply system and the phase of the solar battery frequency are quickly synchronized to obtain the optimum power of the solar battery in a short time. Has been.

JP 2006-166669 A JP 2003-153433 A JP2013-85411A JP 2013-215075 A

  Here, an instantaneous voltage drop (particularly, a voltage drop of about 0.07 seconds to 2 seconds due to a lightning strike) has a problem of damaging a load facility of a consumer or worsening a production yield in an industrial consumer. .

  As a measure against an instantaneous voltage drop, it is common to compensate for the lowered voltage with a UPS storage battery, a capacitor of a voltage sag compensator, or the like. In this case, it is necessary to ensure the capacity of the inverter (DC-AC) of the UPS or the sag compensator according to the electric power (kW) used for the load equipment to be compensated, and the enlargement is forced.

  However, since the frequency of the instantaneous voltage drop is several times / year, it is inefficient to increase the scale of the inverter capacity only for this frequency.

  In addition, in an environment where the storage battery is always used for peak cut operation, etc., it may be possible to use the always-used storage battery as a countermeasure for instantaneous voltage drop, but the peak cut application requires a discharge operation of several hours. In addition, this leads to an increase in storage battery capacity, which is inefficient in cases where it is desired to take only measures against instantaneous voltage drop.

  Patent Document 1 compensates for an instantaneous voltage drop by controlling the current of a rectifier. However, it focuses on preserving the storage battery capacity, and the inverter capacity is increased according to the customer equipment (load equipment) to be compensated. The effect on the point of being lost is not considered.

  Patent document 2 detects the voltage level of the system voltage (commercial power supply voltage) based on the frequency and protects the photovoltaic power generation device due to overcurrent, but does not describe a countermeasure for compensating for the voltage drop.

  An object of the present invention is to obtain a power supply device and a power supply control device that can operate stored power without waste.

  Another object of the present invention is to obtain a power supply device and a power supply control device that can predict the occurrence of an instantaneous voltage drop and continue stable power supply to a load facility.

  A power supply device of the present invention is a power supply device that supplies power to a load facility, and has a first function that reversely flows power generated by renewable energy, and replaces previously stored power with power from a commercial power supply. A second function of supplying power to the load facility, and a power supply source according to the first function or the second function selected by the power supply control means. Switching means for switching the power supply path connecting the load facility.

  According to the present invention, the power supply control means has two functions.

  The first function is a function to reversely flow the power generated by renewable energy. The reverse power flow is executed for the power transmission / distribution lines of general power transmission / distribution companies that are interconnected in advance. In addition, grid connection means operating by connecting power generation equipment or the like to the grid.

  The second function is a function of supplying previously stored power to load equipment instead of power from a commercial power source.

  By the way, the load facility is usually supplied with power from a commercial power source, and the power supply control means selects the first function, and the switching means uses the power according to the first function. Switch to the supply path. As a result, the power generated by the power supply control means is reversed and the waste of the generated power can be saved.

  Here, when a situation where the power from the commercial power source is not properly supplied to the load facility (for example, an unexpected situation such as an instantaneous voltage drop) may occur, the load facility may be hindered. Therefore, in the power supply control means, the second function is selected, and the switching means switches to the power supply path corresponding to the second function. As a result, the power stored in advance is supplied to the load facility instead of the power from the commercial power source.

  That is, the power output from the power supply control means can be selected as one of the use of reverse power flow and auxiliary power in the event of a situation where power from the commercial power supply is not properly supplied to the load facility. This is possible, and waste of power facilities for dealing with unforeseen situations with low occurrence frequency can be eliminated.

  In the present invention, the power supply control means includes an electricity storage device, and the electricity storage device can be charged or discharged in response to selection of the second function.

  The electricity storage device can be charged by a commercial power source and discharged to a load facility.

  In the present invention, the power supply control means includes an electricity storage device, and the electricity storage device is charged during the selection of the first function, and can be discharged when the second function is selected. It is said.

  By charging the power storage device in advance while the first function is selected, it is possible to always ensure power when the second function is selected.

  In the present invention, in the power supply control means, the first function is selected in a normal state, and when it is predicted that a situation in which power from a commercial power supply is not properly supplied to the load facility will occur. The second function is selected, and the switching means switches the power supply path according to the second function when the situation occurs after the occurrence of the situation is predicted.

  By switching to the second function in advance at the prediction stage, for example, an unexpected situation such as an instantaneous voltage drop can be quickly dealt with.

  A power supply control device according to the present invention is a power supply control device used in a power supply device that supplies power to a load facility, and includes a first function that reversely flows power generated by renewable energy, and a power storage device. A second function of supplying electric power to be discharged to a load facility instead of electric power from a commercial power supply, and the first function selected by the power supply control means or the second function Switching means for switching a power supply path for connecting a power supply source and the load facility according to the function of the power supply, a predicting means for predicting when an instantaneous voltage drop occurs, and a detection for detecting the occurrence of the instantaneous voltage drop And the power supply control means selects the second function when the prediction means predicts the occurrence of the instantaneous voltage drop, and the switching means After the selection of the function, and when the occurrence of an instantaneous voltage drop is detected by the detection means, instead of the power from the commercial power source, the power of the power storage device is supplied to the load facility to the load facility It is characterized by switching.

  According to the present invention, the power supply control means has two functions.

  The first function is a function to reversely flow the power generated by renewable energy. The reverse power flow is executed for the transmission lines of general power transmission / distribution companies that are grid-connected in advance.

  The second function is a function of supplying electric power discharged from the power storage device to the load facility instead of electric power from the commercial power source.

  By the way, power from a commercial power supply is normally supplied to the load facility, and the power supply control means selects the first function, and the switching means uses the power corresponding to the first function. Switch to the supply path. As a result, the power generated by the power supply control means is reversed and the waste of the generated power can be saved.

  Here, when the instantaneous voltage drop occurs, the load facility may be disturbed.

  Therefore, the second function is selected when the prediction means predicts the time when the instantaneous voltage drop occurs and the power supply control means predicts the occurrence of the instantaneous voltage drop by the prediction means.

  The detecting means detects the occurrence of an instantaneous voltage drop.

  In the switching means, after the second function is selected and when the occurrence of the instantaneous voltage drop is detected by the detection means, a power supply path for supplying the power of the power storage device to the load facility instead of the power from the commercial power source Switch to.

  In other words, the power output from the power supply means can be selected as either a reverse power flow power or an auxiliary power at the time of instantaneous voltage drop, and copes with an instantaneous voltage drop that occurs less frequently. Therefore, waste of electric power equipment can be eliminated.

  In the present invention, the electricity storage device can be charged or discharged when the second function is selected.

  The electricity storage device can be charged by a commercial power source and discharged to a load facility.

  In the present invention, the power storage device is charged with electric power generated by the renewable energy under the first function.

  Electric power generated by renewable energy can also be used effectively.

  In the present invention, the predicting means extracts a bad weather period based on weather forecast information and predicts it as a period during which the instantaneous voltage drop can occur.

  Lightning strikes can be cited as a factor that causes an instantaneous voltage drop. Lightning strikes occur when the weather is bad, so a bad weather period is extracted based on the weather forecast information and predicted as a period during which the instantaneous voltage drop can occur. Prediction is possible.

  In the present invention, the prediction means acquires lightning prediction information including light, electromagnetic waves, or charging based on the occurrence of lightning near the power transmission and distribution equipment, and predicts based on the acquired lightning prediction information It is characterized by. In addition, in order to acquire lightning prediction information, you may make it install the sensor which detects a lightning bolt along the power transmission / distribution line from a power station to a consumer beforehand, for example.

  That is, lightning is generated directly by detecting lightning prediction information including light, electromagnetic waves, or electrification based on the occurrence of lightning, or by taking lightning prediction information from an existing lightning detection system. And the possibility of lightning strikes can be accurately predicted.

  In the present invention, the predicting means predicts a period during which the first function cannot be executed as a period during which the instantaneous voltage drop can occur.

  When the first function is, for example, solar power generation, the power generation function is impaired when the sun is hidden. On the other hand, when solar power generation is possible, the probability of a lightning strike is low as long as the sun is out. Therefore, a period during which the first function is difficult to execute (including a case where the amount of power generation is extremely small) is predicted as a period during which the instantaneous voltage drop can occur. Thereby, facilities can be simplified rather than the system which always charges an electrical storage device, such as UPS, and copes with an instantaneous voltage drop.

  In the present invention, when the voltage of the electric power from the commercial power source is equal to or less than a threshold value set within a range that does not affect the load facility, the detection means regards that an instantaneous voltage drop has occurred. It is a feature.

  The detection means considers that an instantaneous voltage drop has occurred when the threshold is below a threshold value set within a range that does not affect the load equipment. As a result, the load facility is not affected by the instantaneous voltage drop.

  As described above, in the present invention, the stored electric power can be operated without waste.

  Further, in addition to the above effects, it is possible to predict the occurrence of an instantaneous voltage drop and continue stable power supply to the load facility.

It is the schematic of the power supply device for supplying electric power to the load installation which concerns on this Embodiment. It is a block diagram which shows the outline of the control apparatus which concerns on this Embodiment. (A) is the schematic which shows an example of the power transmission and distribution equipment for supplying electric power from a power station to a consumer, (B) is a timing chart which shows the influence of the voltage by the lightning strike which occurs in a power transmission line. It is the control block diagram which showed the control specialized for the countermeasure against instantaneous voltage drop in the control apparatus which concerns on this Embodiment according to the function. It is a flowchart which shows the electric power supply control performed when the power supply device which concerns on this Embodiment starts operation | movement. It is the schematic of the power supply device for supplying electric power to the load installation which concerns on this Embodiment, (A) is a normal state, (B) is an instantaneous voltage drop generation | occurrence | production state from an instantaneous voltage drop prediction, (C) is instantaneous. It is an electric power supply path | route which shows the state in which voltage drop is generating. FIG. 6 is a timing chart showing a series of flows from when the instantaneous voltage drop is predicted in the flowchart of FIG.

  FIG. 1 shows a schematic diagram of a power supply device 12 for supplying power to the load facility 10.

  Electric power (sometimes referred to as commercial power) is supplied from the commercial power supply 14 to the power supply device 12, and power from the commercial power supply 14 is supplied to the load facility 10 in a steady state. In the present embodiment, the steady state means that power of a predetermined AC voltage is constantly supplied.

  The commercial power source 14 is connected to the load facility 10 via the on / off type first switch SW1.

  The first switch SW1 and the load facility 10 are connected to the first contact A of the contact switching type second switch SW2.

  The second contact B of the second switch SW2 is connected to a power supply 16 for reverse power flow that is grid-connected. The common contact C of the second switch SW2 is connected to the output terminal of the inverter 18 as power supply control means.

  A solar power generation device 20 and a power storage device 22 as a renewable energy power generation device are connected to the input end of the inverter 18.

  In the present embodiment, the solar power generation device 20 is applied as the renewable energy power generation device. However, the inverter 18 is used to generate power with other renewable energy (for example, wind, biomass, hydraulic power, etc.). If it is a thing, it will not be limited to the solar power generation device 20.

  The inverter 18 generally converts DC power into AC (inverter circuit) having a target voltage and frequency (for example, 100 V / 50 Hz, 200 V / 60 Hz, etc.). In the present embodiment, DC power generated by the solar power generation device 20 and DC power discharged by the power storage device 22 are converted into AC power.

  The power supply device 12 includes a control device 24, and controls the states of the first switch SW1, the second switch SW2, the inverter 18, the solar power generation device 20, and the power storage device 22.

  As shown in FIG. 2, the control device 24 includes a microcomputer 26. The microcomputer 26 includes a CPU 26A, a RAM 26B, a ROM 26C, an input / output (I / O) port 26D, and a bus 26E such as a data bus and a control bus for connecting them.

  The inverter 18 is connected to the I / O 26D via the I / F 28, the solar power generation device 20 is connected via the I / F 30, and the power storage device 22 is connected via the I / F 32.

  In addition, a first switch SW1, a second switch SW2, and a recording device 34 are connected to the I / O 26D. Note that a hard disk is applicable as the recording device 34. Also, other recording devices represented by an SD card may be used.

  Further, an information receiving unit 36 is connected to the I / O 26D so as to receive instantaneous voltage drop prediction information and instantaneous voltage drop occurrence information as information for measures against instantaneous voltage drop described later.

  The control device 24 controls the inverter 18 based on a control program stored in advance in the ROM 26 </ b> C, and the first function for causing the power generated by the solar power generation device 20 to flow backward to the power source 16, or the power storage device The second function of supplying the power stored in advance 22 to the load facility 10 instead of the power from the commercial power supply 14 is selected and executed.

  The control program is not limited to the ROM 26C, but may be stored in the hard disk 34 or an IC memory (not shown).

  (Causes of instantaneous voltage drop)

  As shown in FIG. 3 (A), the commercial power supply 14 (see FIG. 1) uses the power generated by the power plant 38 as a plurality of substations (substations 40A, 40B, and 40C in FIG. 3 (A)). To supply consumers.

  As a mechanism for supplying power from the power plant 38 to consumers, a two-line vertical array transmission line system is applied as a standard and most common form.

  More specifically, a plurality of steel towers 42 (two in this case) are provided between the substation 40A and the substation 40B, and between the substation 40B and the substation 40C, respectively. In this configuration, one line of power transmission lines 43A and 43B and power transmission lines 43C and 43D are installed on each of the left and right sides (one line is a group of three power transmission lines). The power transmission lines 43 </ b> A, 43 </ b> B, 43 </ b> C, and 43 </ b> D are collectively referred to as a power transmission line 43.

  For example, when one line between substations cannot be transmitted due to a natural disaster (for example, lightning strike), power transmission can be continued on the other line.

  Here, power of a predetermined voltage and frequency is supplied to the load facility 10 (see FIG. 1). For example, as shown in FIG. Changes can occur in the defined voltage and frequency.

  If a change (particularly voltage drop) occurs in the power of a predetermined voltage and frequency in the load facility 10, the load facility 10 is damaged or the production yield based on the operation of the load facility 10 is deteriorated ( (In general, it is referred to as an adverse effect).

  As shown in FIG. 3B, when there is a lightning strike on the power transmission line 43A, a voltage drop occurs in all the power transmission lines 43 with respect to the normal voltage. Here, after 0.07 second to 2 seconds from the occurrence of the lightning strike, by disconnecting the power transmission line 43A, the voltages of the power transmission lines 43B, C, and D other than the power transmission line 43A are restored. This voltage drop period (0.07 to 2 seconds) is referred to as an instantaneous voltage drop period.

  For reference, the general power transmission / distribution company re-transmits power after about 60 seconds after disconnecting the power transmission line 43A. The return of the transmission line 43A after this re-transmission is called an instantaneous power failure, and the failure to return is called a power failure.

  (Measures against instantaneous voltage drop)

  In the power supply device 12 (see FIG. 1) of the present embodiment, the frequency that occurs annually is low (several times / year), and the instantaneous voltage drop occurs in a short period of 0.07 seconds to 2 seconds. On the other hand, the power supply control which compensates for the load facility 10 was realized while also being used as a function to reversely flow the electric power from renewable energy that can be always used.

  FIG. 4 is a control block diagram showing, by function, control specialized for measures against instantaneous voltage drop in the control device 24 of the power supply device 12. Note that the hardware configuration of each block is not limited to the control device 24, and some or all of the blocks may be processed under the execution of a control program stored in advance.

  The information receiving unit 36 receives instantaneous voltage drop prediction information and instantaneous voltage drop occurrence information.

  Examples of the instantaneous voltage drop prediction information include the following forms.

  (Prediction 1) The weather information distributed by the weather forecast (government agency or specialist) is received and analyzed to predict the occurrence of lightning.

  (Prediction 2) Lightning strikes are predicted by detecting light, sound, electromagnetic waves from lightning bolts, measuring the amount of charge, and comparing predetermined threshold values.

  (Prediction 3) A period during which the first function cannot be executed, that is, a non-sunshine period during which the solar power generation device 20 cannot generate power is always set as an instantaneous voltage drop prediction period.

  Note that the prediction 3 is not a direct prediction of lightning, but is based on the theory that the period during which the photovoltaic power generation device 20 can generate power is fine, the occurrence of lightning is low, and power generation is impossible at night. The solar power generation device 20 is mainly used.

  Moreover, the following forms are mentioned as information on occurrence of instantaneous voltage drop caused by lightning strikes.

  (Decision 1) The voltage of the commercial power source 14 is detected and compared with a threshold value.

  (Determination 2) The frequency of the commercial power source 14 is detected and compared with a threshold value.

  (Decision 3) Obtain instantaneous voltage drop information from an external organization such as an electric power company.

  When receiving the instantaneous voltage drop prediction information, the information receiving unit 36 sends the information to the instantaneous voltage drop prediction unit 50.

  The instantaneous voltage drop prediction unit 50 executes prediction determination. That is, lightning has occurred in the area of the power transmission facility shown in FIG. 3A, and the possibility of lightning strikes on the power transmission line 43 is predicted.

  The instantaneous voltage drop prediction unit 50 is connected to the function selection unit 52, the inverter output control unit 54, and the switch switching control unit 56. When the instantaneous voltage drop prediction unit 50 predicts that lightning will occur, it outputs an activation signal for lightning strike countermeasures to the function selection unit 52, the inverter output control unit 54, and the switch switching control unit 56.

  When receiving the activation signal, the function selection unit 52 controls the inverter 18, the solar power generation device 20, and the power storage device 22, and the function that is normally selected and that reversely flows to the power supply 16 (first function), The function (second function) for discharging the electric power charged in the electricity storage device 22 is selected. When the lightning prediction is canceled, the first function is selected.

  Further, when receiving the start signal, the inverter output control unit 54 limits the power output from the inverter 18.

  Further, when receiving the activation signal, the switch switching control unit 56 controls the second switch SW2 to switch from the second contact B to the first contact A. When the lightning prediction is canceled, the first contact A is switched to the second contact B.

  On the other hand, when the information receiving unit 36 receives the instantaneous voltage drop occurrence information, the information receiving unit 36 directly transfers the information to the switch switching control unit 56.

  Upon receiving the instantaneous voltage drop occurrence information, the switch switching control unit 56 turns off the first switch SW1, cuts off the power supply from the commercial power supply 14, and simultaneously restricts the output from the inverter 18 to the inverter output control unit 54. To release. At this time, the second function is selected for the inverter 18, and the discharge system from the power storage device 22 is prepared. The load facility 10 is discharged from the power storage device 22 instead of the power from the commercial power supply 14. Power is supplied. That is, the power supply path is changed. When the return of power is confirmed, the first function of the inverter 18 is selected, the first switch SW1 is turned on, and the second switch SW2 is switched to the second contact B.

  Hereinafter, the operation of the present embodiment will be described based on the flowchart of FIG.

  FIG. 5 is a flowchart showing power supply control executed when the power supply device 12 starts operation.

  In step 100, the first function is selected as the function of the inverter 18, and then the process proceeds to step 102 where the first switch SW1 is turned on and the second switch SW2 is switched to the second contact B.

  That is, as shown in FIG. 6A, the load facility 10 is supplied with electric power from the commercial power source 14, and the electric power generated by the solar power generation device 20 is sent to the power source 16 for reverse power flow to be sold. Is done.

  In the next step 104, instantaneous voltage drop prediction information is acquired, and the process proceeds to step 106. In step 106, the occurrence of lightning is predicted and analyzed based on the acquired instantaneous voltage drop prediction information.

  In the next step 108, it is determined whether or not lightning has been predicted as a result of the prediction analysis in step 106. If a negative determination is made in step 108, the process returns to step 104 and the above process is repeated. In this case, the inverter 18 continues the first function (reverse power flow).

  If an affirmative determination is made in step 108, it is determined that lightning has occurred, and there is a possibility that an instantaneous voltage drop may occur due to lightning, and the process proceeds to step 110.

  In step 110, the second function is selected as the function of the inverter 18, then the process proceeds to step 112 to limit the output of the inverter 18, and the process proceeds to step 114 to turn on (continue) the first switch SW1. The second switch SW2 is switched to the first contact A.

  That is, as shown in FIG. 6B, the power supply from the commercial power supply 14 is continued, but the reverse power flow is not executed, and the inverter 18 is in a standby state in which power can be supplied from the power storage device 22 quickly. It becomes a state.

  In the next step 116, it is determined whether or not an instantaneous voltage drop has occurred due to a lightning strike. If the result of determination in step 116 is negative, the process proceeds to step 118 to determine whether or not lightning occurrence prediction has been canceled. If a negative determination is made in step 118, the process returns to step 116 and is repeated until an affirmative determination is made in either step 116 or step 118.

  Here, if an affirmative determination is made in step 116, it is determined that an instantaneous voltage drop has occurred, the process proceeds to step 120, the first switch SW1 is turned off, and then the process proceeds to step 122 to limit the output of the inverter 18 Is released.

  That is, as shown in FIG. 6C, the electric power discharged from the power storage device 22 is supplied from the inverter 18 to the load facility 10, and the load facility 10 sets the target voltage even if there is an instantaneous voltage drop. Operation can be continued in a maintained state.

  In the next step 124, it is determined whether or not the power is restored. The negative determination period in step 124 is a period of instantaneous voltage drop. That is, for example, when about 0.07 second to 2 seconds elapses, an affirmative determination is made in step 124, the process returns to step 100, and the above affirmation is repeated, whereby power from the commercial power supply 14 is supplied to the load facility 10. The electric power generated by the solar power generation device 20 is sent to the power supply 16 for reverse power flow. In addition, when there is little charge amount of the electrical storage device 22, it charges with the electric power which the solar power generation device 20 generated.

  On the other hand, if an affirmative determination is made in step 118 during the repetition of step 116 and step 118, it is determined that lightning has been predicted but no lightning has occurred, and as a result, no instantaneous voltage drop has occurred, and processing returns to step 100.

  FIG. 7 shows a series of flows from when the instantaneous voltage drop is predicted in the flowchart of FIG. 5 until the instantaneous voltage drop occurs due to a lightning strike, and then ends.

  From FIG. 7, since the inverter 18 sells power by causing the power generated by the photovoltaic power generator 20 to flow backward as a first function, it can be used effectively even when there is no instantaneous voltage drop. You can see that

  Further, from FIG. 7, by preparing for discharge by the inverter 18 based on the lightning occurrence prediction (selection of the second function), the purpose of the load facility 10 can be achieved without delay in the occurrence of the instantaneous voltage drop. It can be seen that voltage power can be supplied.

  As described above, in the present embodiment, the inverter 18 can always be effectively used, and the power of the load facility 10 can be secured without delay in response to an instantaneous voltage drop. Moreover, the capacity | capacitance of the electrical storage device 22 more than necessary becomes unnecessary compared with the time of peak cut use combined use.

DESCRIPTION OF SYMBOLS 10 Load equipment 12 Power supply device 14 Commercial power supply SW1 1st switch (switching means)
SW2 Second switch (switching means)
16 Power supply 18 Inverter (Power supply control means)
20 Solar power generation device (first function)
22 Power storage device (second function)
24 Control device (power supply control means)
26 Microcomputer 26A CPU
26B RAM
26C ROM
26D input / output (I / O) port 26E bus 28 I / F
30 I / F
32 I / F
34 Recording device 36 Information receiver (detection means)
38 Power plant 40 (40A, 40B, 40C) Substation 42 Steel tower 43 (43A, 43B, 43C, 43D) Transmission line 50 Instantaneous voltage drop prediction unit (prediction means)
52 function selection unit 54 inverter output control unit 56 switch switching control unit

Claims (11)

A power supply device for supplying power to a load facility,
A power supply control means comprising: a first function that reversely flows power generated by renewable energy; and a second function that supplies power stored in advance to the load facility instead of power from a commercial power source. ,
Switching means for switching a power supply path connecting the power supply source and the load facility according to the first function or the second function selected in the power supply control means;
A power supply unit having   The power supply apparatus according to claim 1, wherein the power supply control unit includes an electricity storage device, and the electricity storage device can be charged or discharged upon selection of the second function. The power supply control means includes an electricity storage device,
The power storage device according to claim 1, wherein the power storage device is charged during the selection of the first function, and can be discharged when the second function is selected. In the power supply control means, the first function is selected in a normal state,
When it is predicted that a situation in which power from a commercial power supply is not properly supplied to the load facility will occur, the second function is selected,
4. The switch according to claim 1, wherein, after the occurrence of the situation is predicted, the switching unit switches the power supply path according to the second function when the situation occurs. The power supply device according to 1. A power supply control device used in a power supply device that supplies power to a load facility,
A power supply control comprising: a first function that reversely flows power generated by renewable energy; and a second function that supplies power discharged from an electricity storage device to load equipment instead of power from a commercial power source Means,
Switching means for switching a power supply path connecting the power supply source and the load facility according to the first function or the second function selected in the power supply control means;
A predicting means for predicting when an instantaneous voltage drop occurs;
Detecting means for detecting the occurrence of the instantaneous voltage drop,
In the power supply control means, when the prediction means predicts the occurrence of the instantaneous voltage drop, the second function is selected,
In the switching means, after the selection of the second function and at the time when the occurrence of an instantaneous voltage drop is detected by the detection means, the power of the power storage device is used instead of the power from the commercial power supply. Switching to the power supply path to be supplied to
The power supply control apparatus characterized by the above-mentioned.   The power supply control device according to claim 5, wherein the power storage device is capable of being charged or discharged when the second function is selected.   6. The power supply control apparatus according to claim 5, wherein the power storage device is charged with power generated by the renewable energy under the first function.   6. The power supply control device according to claim 5, wherein the predicting means extracts a bad weather period based on weather forecast information and predicts it as a period in which the instantaneous voltage drop can occur.   The predicting means acquires lightning prediction information including any of light, electromagnetic waves, or electrification based on the occurrence of lightning in the vicinity of power transmission and distribution equipment, and predicts based on the acquired lightning prediction information The power supply control device according to claim 5.   The power supply control device according to claim 5, wherein the prediction unit predicts a period during which the first function is difficult to execute as a period during which the instantaneous voltage drop may occur.   The detection means, when the voltage of the electric power from the commercial power supply falls below a threshold value set within a range that does not affect the load equipment, is regarded as occurrence of an instantaneous voltage drop. The power supply control device according to any one of claims 5 to 10.