JP7011907B2 - Power supply, power supply control - Google Patents

Description

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

Patent Document 1 describes an uninterruptible power supply that reliably detects a power failure of a commercial power source and operates the storage battery without unnecessary operation of the storage battery due to a momentary voltage drop (commonly known as a momentary low). UPS "Uninterruptible Power Supply") is described.

In Patent Document 1, a rectifier that converts AC power from a commercial AC power supply into DC power, an inverter that converts DC power into AC power and supplies it to load equipment, a storage battery connected between them, and a commercial power supply. It is equipped with a means to detect an abnormality in the AC power input from, for example, by frequency fluctuation (frequency maintenance when instantaneous voltage drop, frequency 0 when power failure), and when the instantaneous voltage drop, the voltage drop is detected by the rectifier. It is described that the voltage is compensated by increasing the current allowable limit and the storage battery is preserved. That is, since the voltage is maintained within a predetermined frequency fluctuation range when the voltage drops instantaneously, the storage battery is applied only during a power failure by distinguishing whether the cause of the voltage drop is a momentary 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 in an electric power system at high speed and stops an inverter.

Patent Document 2 includes a system voltage level drop detecting means for detecting that the system voltage has reached a predetermined voltage level and a detection duration measuring means for measuring the detection duration of the detection means, and detects the level drop. If the measurement time is longer than a predetermined time, an instantaneous voltage drop is detected. As a result, the photovoltaic power generation device can be protected from the overcurrent of the inverter caused by the instantaneous voltage drop.

As a reference, Patent Document 3 describes that even if an instantaneous voltage drop occurs, the uninterruptible power supply device continues to output the power generated by the photovoltaic power generation device from the power conditioner.

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

Japanese Unexamined Patent Publication No. 2006-166669 Japanese Patent Application Laid-Open No. 2003-153433 Japanese Unexamined Patent Publication No. 2013-85411 Japanese Unexamined Patent Publication No. 2013-21507

Here, a momentary voltage drop (particularly, a voltage drop of about 0.07 to 2 seconds due to a lightning strike) has problems such as damaging the load equipment of the consumer and deteriorating the production yield of the industrial consumer. ..

As a countermeasure against the instantaneous voltage decrease, it is common to compensate for the decreased voltage by using a UPS storage battery, a capacitor of an instantaneous low compensation device, or the like. In this case, it is necessary to secure the capacity of the UPS or the inverter (DC-AC) of the instantaneous low compensation device according to the electric power (kW) used for the load equipment to be compensated, and the size of the inverter (DC-AC) must be increased.

However, since the frequency of 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, it is conceivable that the constantly used storage battery can also be used as a countermeasure against instantaneous voltage drop, but the peak cut application requires several hours of discharge operation. This is inefficient in cases where only measures against instantaneous voltage drop are desired, as it causes an increase in the capacity of the storage battery.

Patent Document 1 compensates for the instantaneous voltage drop by controlling the current of the rectifier, but the main purpose is to preserve the storage battery capacity, and the inverter capacity is increased according to the consumer equipment (load equipment) to be compensated. The effect on the point that it ends up is not taken into consideration.

Patent Document 2 detects the voltage level of the system voltage (commercial power supply voltage) by frequency and protects the photovoltaic power generation device due to overcurrent, but does not describe the measures 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 capable of predicting the occurrence of an instantaneous voltage drop and continuing stable power supply to load equipment.

The power supply device of the present invention is a power supply device that supplies electric power to load equipment, and has a first function of reverse-flowing electric power generated by renewable energy and replacing electric power stored in advance with electric power from a commercial power source. The power supply control means including the second function of supplying the load equipment, and the power supply source and the power supply source according to the first function or the second function selected in the power supply control means. It has a switching means for switching a power supply path for connecting to a load facility, and in the power supply control means, the first function is selected in a normal state, and the first function is selected according to the selection. The second function is selected when it is predicted that the power supply path switched by the switching means causes the power to flow backward and the load equipment is not properly supplied with the power from the commercial power source. In addition, the power supply path switched by the switching means according to the selection of the second function is controlled to a standby state in which the previously stored electric power can be supplied to the load equipment, and when the situation occurs, the said It is characterized in that the standby state is released and the power supply to the load facility of the pre-stored electric power is controlled to be started .

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

The first function is a function of reverse power flow of electric power generated by renewable energy. Reverse power flow is executed for the transmission and distribution lines of the general power transmission and distribution business operator that are interconnected in advance. The grid interconnection means that the power generation equipment or the like is connected to the grid for operation.

The second function is to supply the pre-stored electric power to the load equipment in place of the electric power from the commercial power source.

By the way, the load equipment is usually supplied with electric power from a commercial power source, the first function is selected for the electric power supply control means, and the switching means is electric power according to the first function. Switch to the supply route. As a result, the electric power generated by the electric power supply control means is reversely flowed, and the waste of the generated electric power can be eliminated.

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

That is, the electric power output from the electric power supply control means can be selected as either reverse power flow electric power or auxiliary electric power in the event that the electric power from the commercial power source is not properly supplied to the load equipment. It is possible, and it is possible to eliminate the waste of electric power equipment for dealing with unforeseen circumstances that occur infrequently. Further, by switching to the second function in advance at the prediction stage, it is possible to quickly respond to an unexpected situation such as an instantaneous voltage drop.

In the present invention, the power supply control means includes a power storage device, and the power storage device is charged by a power supply path switched by the selection of the first function, and the power supply control means is charged by the selection of the second function. It is characterized in that it can be discharged by the switched power supply path .

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

The electric power supply control device of the present invention is a power supply control device used for a power supply device that supplies electric power to a load facility, and has a first function of reverse-flowing electric power generated by renewable energy and a power storage device. A power supply control means including a second function of supplying the discharged power to the load facility in place of the power from the commercial power source, and the first function or the second function selected in the power supply control means. A switching means for switching the power supply path connecting the power supply source and the load facility according to the function of the above, a predictive means for predicting the time when the instantaneous voltage drop occurs, and a detection for detecting the occurrence of the momentary voltage drop. In the power supply control means, the second function is selected when the prediction means predicts the occurrence of the instantaneous voltage drop, and the power supply control means is selected according to the selection of the second function. The standby state is controlled so that the electric power stored in advance can be supplied to the load equipment by the power supply path switched by the switching means, and when the detection means detects the occurrence of the instantaneous voltage drop, the standby state is released. Therefore , it is characterized in that it is controlled so as to start supplying electric power to the load facility of the electric power stored in advance .

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

The first function is a function of reverse power flow of electric power generated by renewable energy. Reverse power flow is executed for the transmission line of a general power transmission and distribution business operator that has been interconnected in advance.

The second function is to supply the electric power discharged from the power storage device to the load equipment in place of the electric power from the commercial power source.

By the way, the load equipment is usually supplied with electric power from a commercial power source, the first function is selected for the electric power supply control means, and the switching means is electric power according to the first function. Switch to the supply route. As a result, the electric power generated by the electric power supply control means is reversely flowed, and the waste of the generated electric power can be eliminated.

Here, if a momentary voltage drop occurs, the load equipment may be hindered.

Therefore, the predicting means predicts the time when the instantaneous voltage drop occurs, and the power supply control means selects the second function when the predicting means predicts the occurrence of the instantaneous voltage drop.

Further, the detection means detects the occurrence of an instantaneous voltage drop.

In the switching means, after the selection of the second function and when the detection means detects the occurrence of an instantaneous voltage drop, the power supply path for supplying the power of the power storage device to the load equipment instead of the power from the commercial power supply. Switch to.

That is, the power output from the power supply means can be selected as either reverse power flow power or auxiliary power when the instantaneous voltage drops, and the instantaneous voltage drop that occurs less frequently can be dealt with. It is possible to eliminate the waste of power equipment for this purpose.

The present invention is characterized in that the power storage device is charged with the power generated by the renewable energy by the power supply path switched by the first function as a trigger .

It is also possible to effectively use the electric power generated by renewable energy.

The present invention is characterized in that the prediction means extracts a bad weather period based on the weather forecast information and predicts it as a period in which the instantaneous voltage drop can occur.

A lightning strike is one of the factors that cause an instantaneous voltage drop. Since lightning strikes occur in bad weather, the bad weather period is extracted based on the weather forecast information and predicted as the period in which the instantaneous voltage drop can occur, so that the accuracy is relatively high without using a prediction device. Prediction is possible.

In the present invention, the predicting means acquires lightning prediction information including any of light, electromagnetic waves, or charging based on the generation of lightning in the vicinity of the power transmission and distribution equipment, and makes a prediction based on the acquired lightning prediction information. It is characterized by. In addition, in order to acquire lightning prediction information, for example, a sensor for detecting lightning may be installed in advance along the transmission / distribution line from the power plant to the consumer.

That is, lightning is directly generated by detecting lightning prediction information including any of light, electromagnetic waves, or charging based on the generation of lightning, or by taking in lightning prediction information from an existing lightning detection system. It is possible to recognize that and accurately predict the possibility of lightning strikes.

The present invention is characterized in that the predicting means predicts a period during which the first function cannot be performed as a period during which the instantaneous voltage drop can occur.

When the first function is, for example, photovoltaic power generation, the power generation function is impaired when the sun is hidden. On the other hand, if solar power generation is possible, the probability of lightning strikes is low as long as the sun is out. Therefore, the period during which the first function becomes difficult to execute (including the case where the amount of power generation is extremely small) is predicted as the period during which the instantaneous voltage drop can occur. As a result, it is possible to simplify the equipment as compared with the method of constantly charging the power storage device such as UPS to deal with the instantaneous voltage drop.

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

The detection means considers that an instantaneous voltage drop occurs when the threshold value is equal to or less than the threshold value set within a range that does not affect the load equipment. As a result, the load equipment is not hindered by the instantaneous voltage drop.

As described above, in the present invention, it is possible to predict the occurrence of an instantaneous voltage drop and continue stable power supply to the load equipment.

It is a schematic diagram of the power supply device for supplying electric power to the load equipment which concerns on this embodiment. It is a block diagram which shows the outline of the control device which concerns on this embodiment. (A) is a schematic diagram showing an example of a power transmission and distribution facility for supplying electric power from a power plant to a consumer, and (B) is a timing chart showing the influence of voltage due to a lightning strike occurring on a transmission line. It is a control block diagram which showed the control specialized for the measures against the instantaneous voltage drop in the control device which concerns on this embodiment by function. It is a flowchart which shows the electric power supply control which is executed when the power supply apparatus which concerns on this embodiment starts operation. It is a schematic diagram of the power supply device for supplying electric power to the load equipment which concerns on this embodiment. FIG. It is a power supply path indicating a state in which a voltage drop is occurring. In the flowchart of FIG. 5, it is a timing chart showing a series of flow from the prediction of the instantaneous voltage drop to the end of the instantaneous voltage drop caused by a lightning strike.

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

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

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

The first switch SW1 and the load equipment 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 the power supply 16 for reverse power flow connected to the grid. The common contact C of the second switch SW2 is connected to the output end of the inverter 18 as a power supply control means.

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

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

The inverter 18 generally converts DC power into alternating current having a target voltage and frequency (for example, 100V / 50Hz, 200V / 60Hz, etc.) (inverter circuit), and in the present embodiment, the inverter 18 is used. The DC power generated by the solar power generation device 20 and the 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 photovoltaic 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 has 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 or a control bus connecting them.

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

Further, the first switch SW1, the second switch SW2, and the recording device 34 are connected to the I / O 26D. A hard disk can be applied as the recording device 34. Further, it may be another recording device represented by an SD card.

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

The control device 24 has a first function of controlling the inverter 18 based on a control program stored in advance in the ROM 26C to reverse the power generated by the photovoltaic power generation device 20 to the power source 16, or a power storage device. A second function of supplying the electric power stored in advance in 22 to the load equipment 10 in place of the electric power from the commercial power source 14 is selected and executed.

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

(Factors that cause instantaneous voltage drop)

As shown in FIG. 3A, the commercial power source 14 (see FIG. 1) uses the power generated by the power plant 38 at a plurality of substations (substations 40A, 40B, and 40C in FIG. 3A). It has come to be supplied to consumers through.

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

More specifically, a plurality of steel towers 42 (here, two) are provided between the substation 40A and the substation 40B, and between the substation 40B and the substation 40C, respectively. One transmission line 43A and 43B and one transmission line 43C and 43D are installed on the left and right respectively (one line is a group of three transmission lines). In addition, when the transmission lines 43A, 43B, 43C, and 43D are generically referred to without distinction, they are referred to as transmission lines 43.

For example, if one line between substations cannot transmit power due to a natural disaster (eg, a lightning strike), the other line can continue to transmit power.

Here, the load equipment 10 (see FIG. 1) is supplied with electric power having a predetermined voltage and frequency. For example, as shown in FIG. 3A, if there is a lightning strike on the transmission line 43A, the load equipment 10 (see FIG. 1) is supplied with electric power in advance. Changes can occur in the defined voltage and frequency.

When a change (particularly, a voltage drop) occurs in the power of the load equipment 10 at a predetermined voltage and frequency, the load equipment 10 is damaged or the production yield based on the operation of the load equipment 10 is deteriorated (in particular). Collectively, it may be called an adverse effect).

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

As a reference, the general power transmission and distribution business operator retransmits power about 60 seconds after disconnecting the transmission line 43A. The restoration of the transmission line 43A after this re-transmission is called a momentary power failure, and the recovery is called a power failure.

(Countermeasures against instantaneous voltage drop)

In the power supply device 12 (see FIG. 1) of the present embodiment, the frequency of occurrence in a year is low (several times / year), and the instantaneous voltage drop that occurs in a short period of 0.07 seconds to 2 seconds is achieved. On the other hand, a power supply control that compensates for the load equipment 10 has been realized while also having a function of reverse power flow by renewable energy that can be used at all times.

FIG. 4 is a control block diagram showing controls specialized for measures against instantaneous voltage drop in the control device 24 of the power supply device 12 for each function. 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 the instantaneous voltage drop prediction information and the instantaneous voltage drop occurrence information.

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

(Forecast 1) Receive and analyze the weather information distributed by the weather forecast (government office or specialist company) to predict the occurrence of lightning.

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

(Prediction 3) The period during which the first function becomes infeasible, that is, the non-sunshine period during which the photovoltaic power generation device 20 cannot generate power is always set as the instantaneous voltage drop prediction period.

Prediction 3 does not directly predict 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 small, and power cannot be generated at night. , The main body is the photovoltaic power generation device 20.

Further, as the information on the occurrence of instantaneous voltage drop due to a lightning strike, the following forms can be mentioned.

(Determination 1) The voltage of the commercial power supply 14 is detected and compared with the threshold value.

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

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

When the information receiving unit 36 receives 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 a prediction determination. That is, lightning is occurring in the area of the power transmission facility shown in FIG. 3A, and the possibility of a lightning strike is predicted on the power transmission line 43.

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 a lightning strike will occur, it outputs a start signal for lightning strike countermeasures to the function selection unit 52, the inverter output control unit 54, and the switch switching control unit 56.

Upon receiving the start signal, the function selection unit 52 controls the inverter 18, the photovoltaic power generation device 20, and the power storage device 22 to reverse power flow to the power supply 16 (first function), which is normally selected. A function (second function) for discharging the electric power charged in the power storage device 22 is selected. When the lightning prediction is canceled, the first function is selected.

Further, when the inverter output control unit 54 receives the start signal, the power output from the inverter 18 is limited.

Further, when the switch changeover control unit 56 receives the start signal, it 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, it is directly transferred 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 and cuts off the power supply from the commercial power supply 14, and at the same time, limits the output from the inverter 18 to the inverter output control unit 54. To release. At this time, the second function of the inverter 18 is selected, the discharge system from the power storage device 22 is in place, and the load equipment 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 it is confirmed that the power is restored, 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 with reference to the flowchart of FIG.

FIG. 5 is a flowchart showing a 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, 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 equipment 10 is supplied with electric power from the commercial power source 14, and the electric power generated by the photovoltaic power generation device 20 is sent to the power source 16 for reverse power flow and sold. Is done.

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

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

In step 110, a 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. At the same time, 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 source 14 is continued, but the reverse power flow is not executed, and the inverter 18 is on standby so that the power can be quickly supplied from the power storage device 22. 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 a negative determination is made as a result of the determination in step 116, the process proceeds to step 118 to determine whether or not the 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. To cancel.

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 equipment 10, and the load equipment 10 supplies the target voltage even if there is an instantaneous voltage drop. The operation can be continued in the maintained state.

In the next step 124, it is determined whether or not the power has been restored. The negative determination period in step 124 is a period of instantaneous voltage drop. That is, for example, after about 0.07 seconds to 2 seconds have elapsed, an affirmative determination is made in step 124, the process returns to step 100, and the above affirmation is repeated to supply power from the commercial power source 14 to the load equipment 10. , The electric power generated by the photovoltaic power generation device 20 is sent to the power source 16 for reverse power flow. When the charge amount of the power storage device 22 is small, it is charged by the electric power generated by the solar power generation device 20.

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

FIG. 7 shows a series of flows from the prediction of the instantaneous voltage drop in the flowchart of FIG. 5, the instantaneous voltage drop caused by the lightning strike to the end.

From FIG. 7, since the inverter 18 is sold by reverse power flow of the electric power generated by the photovoltaic power generation device 20 as the first function, it can be effectively used even when the instantaneous voltage drop does not occur. You can see that you can do it.

Further, from FIG. 7, by preparing to discharge with the inverter 18 based on the prediction of lightning occurrence (selection of the second function), there is no delay in the occurrence of the instantaneous voltage drop, and the purpose of the load equipment 10 is It can be seen that the power of the voltage can be supplied.

As described above, in the present embodiment, the inverter 18 can always be effectively used, and when the instantaneous voltage drops, the power of the load equipment 10 can be secured without delay in response immediately. In addition, the capacity of the power storage device 22 is not required more than necessary, as compared with the case where the power storage device 22 is also used for peak cut.

10 Load equipment 12 Power supply device 14 Commercial power supply SW1 First switch (switching means)
SW2 2nd 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 receiving unit (detecting means)
38 Power plant 40 (40A, 40B, 40C) Substation 42 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 (8)

A power supply that supplies power to load equipment
A power supply control means having a first function of reverse power flow of electric power generated by renewable energy and a second function of supplying electric power stored in advance to the load facility in place of electric power from a commercial power source. ,
It has a switching means for switching a power supply path connecting the power supply source and the load equipment according to the first function or the second function selected in the power supply control means.
In the power supply control means, the first function is selected in the normal state , and power is reverse-fed by the power supply path switched by the switching means according to the selection of the first function.
When it is predicted that the power from the commercial power source will not be properly supplied to the load equipment, the second function is selected , and the switching means is used for switching according to the selection of the second function. It is controlled to a standby state in which the electric power stored in advance can be supplied to the load equipment by the electric power supply path.
A power supply device characterized in that, when the situation occurs, the standby state is released and control is performed so as to start supplying electric power stored in advance to the load equipment . The power supply control means includes a power storage device.
The power storage device is characterized in that it is charged by the power supply path switched by the selection of the first function and can be discharged by the power supply path switched by the selection of the second function. The power supply device according to claim 1. It is a power supply control device used for a power supply device that supplies power to load equipment.
Power supply control including a first function of reverse power flow of power generated by renewable energy and a second function of supplying power discharged from a power storage device to load equipment instead of power from a commercial power source. Means and
A switching means for switching a power supply path connecting the power supply source and the load equipment according to the first function or the second function selected in the power supply control means.
A predictive means for predicting when an instantaneous voltage drop will occur,
It has a detection means for detecting the occurrence of the instantaneous voltage drop, and has.
In the power supply control means, when the prediction means predicts the occurrence of the instantaneous voltage drop, the second function is selected, and the switching means is switched according to the selection of the second function. The power supply path controls the pre-stored power to a standby state where it can be supplied to the load equipment.
When the detection means detects the occurrence of the instantaneous voltage drop, the standby state is released, and control is performed so as to start supplying electric power stored in advance to the load equipment.
A power supply control device characterized by that. The power supply control device according to claim 3 , wherein the power storage device is charged with power generated by the renewable energy by a power supply path switched by the first function as a trigger . The power supply control device according to claim 3 , wherein the prediction means extracts a bad weather period based on the weather forecast information and predicts it as a period in which the instantaneous voltage drop can occur . The predicting means is characterized in that it acquires lightning prediction information including any of light, electromagnetic waves, or charging based on the generation of lightning in the vicinity of a power transmission / distribution facility, and makes a prediction based on the acquired lightning prediction information . The power supply control device according to claim 3 . The power supply control device according to claim 3 , wherein the prediction means predicts a period in which the first function becomes difficult to execute as a period in which the instantaneous voltage drop can occur . A claim characterized in that the detection means considers that an instantaneous voltage drop occurs when the voltage of the electric power from the commercial power source becomes equal to or less than a threshold value set within a range that does not affect the load equipment. The power supply control device according to any one of items 3 to 7 .

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