JP2018207569A - Power supply system - Google Patents

Abstract

To provide a power supply system which can stably supply power even in a power supply state of a power supply network or a power generator.SOLUTION: A power supply system comprises: a battery 31 for supplying AC power to a load 10; an inverter 32; a power supply network 20 and a power generator G as power supplies for charging the battery 31; a power supply switching section 34 for switching power supply to the battery 31 to a state where power is supplied from the power supply network 20 and a state power is supplied from the power generator G; and a control section 35 for controlling switching operation of the power supply switching section 34.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power supply system.

Conventionally, an uninterruptible power supply system is known (see, for example, Patent Document 1).
In this prior art, power is supplied to the load from a commercial power supply. When a commercial power supply is interrupted, power is first supplied from a battery, and then the generator is driven to supply power from the generator. I have to.
In this case, the voltage waveform of the generator may become unstable, so the output of the inverter that converts battery power to alternating current and the output of the generator are synchronized, or the output from the inverter is stopped for a predetermined short time Controls such as letting go.

JP 2004-260953 A

  However, in the above-described conventional technology, the generated power may become unstable after the power generated by the generator is supplied. In this case, the load operation may be adversely affected.

  The present invention has been made paying attention to the above problem, and an object of the present invention is to provide a power supply system capable of stably supplying power in any power supply state of a power supply network and a generator.

In order to achieve the above object, a power supply system of the present disclosure includes:
A battery and an inverter for supplying AC power to the load;
A power supply network and a generator as a power source for charging the battery;
A power supply switching unit that switches between supplying power to the battery from the power supply network and switching from the generator;
A control unit for controlling the switching operation of the power supply switching unit;
It was set as the power supply system provided with.

In the power supply system of the present disclosure, AC power is constantly supplied to the load from the battery and the inverter, so that the power can be stably supplied without being affected by the switching of the power supply or the disturbance of the generated power of the generator. Supply can be made. Therefore, the load can be always stably operated.
In addition, since the battery is charged by supplying power from either the power supply network or the generator, power supply to the load can be stabilized.

1 is a block diagram illustrating a configuration of a power supply system A according to a first embodiment. FIG. 3 is a perspective view showing a housing that houses a gas engine, a generator, a control unit, and a gas cylinder in the power supply system according to the first embodiment. 2 is a cross-sectional view showing a pressure regulator applied to the power supply system of Embodiment 1. FIG. 3 is a flowchart showing a flow of processing for maintaining a battery capacity of a battery at a predetermined capacity by a control unit in the power supply system according to the first embodiment. It is a flowchart which shows the flow of the charging process by the said control part. It is a flowchart which shows the flow of the engine starting process by the said control part.

Hereinafter, the best mode for realizing the power supply system of the present disclosure will be described with reference to the drawings.
First, the overall configuration of the power supply system A according to the first embodiment will be described.

(overall structure)
FIG. 1 is a block diagram illustrating a configuration of a power supply system A according to the first embodiment.
The power supply system A is a system that supplies power to a load 10, and includes a control unit 30 that includes a battery 31 that is a power supply source to the load 10, and a power supply network 20 that is a power supply source to the battery 31. And a generator G. The control unit 30 includes a power supply switching unit 34 that switches power supply to the battery 31 to either the power supply network 20 or the generator G, and a control unit 35 that performs switching control thereof.

  In the first embodiment, the load 10 is a traffic light. Note that the load 10 is not limited to a traffic light, and a load that needs to be constantly driven by electric power, such as lighting, can be applied.

The power supply network 20 supplies AC power such as commercial power.
The generator G is driven by the gas engine ENG, converts rotational energy into electrical energy, and generates AC power.

  The gas engine ENG is driven by using LP gas (Liquefied Petroleum Gas) as liquefied gas as fuel. The gas engine ENG is provided with a starter motor SM, and the gas engine ENG performs cranking by driving the starter motor SM.

The LP gas is stored in a liquid state in the gas cylinder 40.
The gas cylinder 40 and the suction side of the gas engine ENG are connected by a gas supply pipe 50. The gas supply pipe 50 is further connected to an opening / closing valve 60, a pressure regulator 70, and the like from the side close to the gas cylinder 40. , Is provided. In the gas supply pipe 50, a carburetor 80 for mixing LP gas and air is provided immediately before the suction side of the gas engine ENG.

  The on-off valve 60 is a valve that is closed when the gas engine ENG is stopped and shuts off the gas supply pipe 50 and is opened when the gas engine ENG is driven to connect the gas supply pipe 50. The on-off valve 60 is automatically opened and closed by driving an actuator such as a solenoid or a motor (not shown).

  The pressure regulator 70 is a well-known one that decompresses the LP gas in the gas cylinder 40 and supplies it to the gas engine ENG. That is, the gas pressure in the gas cylinder 40 is 0.4 to 1.2 MPa, and this is supplied to the gas engine ENG by the pressure regulator 70 as a low pressure gas of 2.0 to 3.3 kPa.

  The control unit 30 controls power supply to the load 10 and includes a battery 31, an inverter 32, a converter 33, a power supply switching unit 34, a control unit 35, and voltage sensors 36 and 37.

  In the first embodiment, DC discharge power from the battery 31 is supplied to the load 10 as AC power by the inverter 32. Further, the battery 31 is charged with AC power of the power supply network 20 and the generator G as DC power by the converter 33.

The power source switching unit 34 selectively switches the power source for charging the battery 31 to either the power supply network 20 or the generator G.
As the battery 31, a lead battery, a nickel hydrogen potential, a lithium ion battery, or the like can be used.

  The control unit 35 includes a CPU (Central Processing Unit) and a memory, and controls the charging / discharging of the battery 31 and the operation of the inverter 32 and the converter 33 associated therewith, and the switching operation of the power supply switching unit 34. Specifically, if the power supply network 20 is in a normal power supply state, the power supply switching unit 34 is in a state of supplying power from the power supply network 20 to the battery 31. On the other hand, if the power supply network 20 is not in a normal power supply state such as a power failure, the gas engine ENG is driven to supply power from the generator G to the battery 31.

  The voltage sensor 36 detects the voltage of the power supply network 20. The voltage sensor 37 detects the voltage of the battery 31. Here, the detection value of the voltage sensor 37 is used to calculate the battery capacity (SOC) of the battery 31. Preferably, the battery capacity is obtained more accurately by measuring the current and temperature together. Is possible.

(Case configuration)
Next, with reference to FIG. 2, the casing 90 that houses the gas engine ENG, the generator G, the control unit 30, and the gas cylinder 40 shown in FIG. 1 will be described.
The housing 90 is made of a steel plate and is formed in a rectangular parallelepiped box shape surrounding the housing housing portion 100 as shown in FIG.

  The housing accommodating portion 100 includes a gas cylinder accommodating portion 11a that accommodates two gas cylinders 40, 40, a generator accommodating portion 11b that accommodates the generator G and the gas engine ENG, and a control unit accommodating portion that accommodates the control unit 30. 11c. The gas cylinder housing part 11 a is partitioned from the generator housing part 11 b and the control unit housing part 11 c by a fire barrier 106. The fire barrier 106 is thicker than other walls such as side walls, and is formed of a steel plate having a thickness of 2.3 mm or more in order to obtain a desired fire resistance.

(Arrangement of gas supply pipe)
Next, wiring of the gas supply pipe 50 that connects the gas cylinders 40 and 40 and the gas engine ENG will be described.
As shown in FIG. 2, the gas supply pipe 50 penetrates the bottom wall 13 of the gas cylinder housing part 11 a without penetrating the fire barrier 106, and is a space inside the leg 15 along the cylindrical bottom wall 13. And is connected to the gas engine ENG of the generator G through the bottom wall 13 of the generator housing 11b.

  The gas supply pipe 50 includes cylinder side pipe parts 50a and 50a that connect the two gas cylinders 40 and 40 and the pressure regulator 70, and a gas engine side pipe part that connects the pressure regulator 70 and the gas engine ENG. 50b. The gas engine side pipe 50b is connected to the carburetor 80 (see FIG. 1) of the gas engine ENG.

(Configuration of pressure regulator)
Next, the pressure regulator 70 will be described with reference to FIG.
As described above, the pressure regulator 70 is a well-known one that depressurizes the high-pressure gas in the gas cylinder 40 to a predetermined low pressure for combustion in the gas engine ENG, and its configuration will be briefly described.

The pressure regulator 70 includes a case 71 that forms an outer shell, and a diaphragm 74 that divides the inside of the case 71 into an upper first chamber 72 and a lower second chamber 73.
Further, on the first chamber 72 side of the case 71, a gas introduction port 71a that is connected to the cylinder side pipe portion 50a of the gas supply pipe 50 and into which high-pressure LP gas is introduced is formed on the left side in the drawing. ing. Further, in the case 71, a gas discharge path 71b that connects the second chamber 73 and the gas engine side pipe portion 50b of the gas supply pipe 50 is formed in the right part in the drawing.

Further, the pressure regulator 70 includes a valve mechanism 75 capable of blocking and communicating between the gas introduction port 71a and the second chamber 73.
The valve mechanism 75 includes a valve body 75a and a lever 75b.
The lever 75b is supported with respect to the case 71 so as to be swingable in the vertical direction in the drawing with the pivot 75c as the center. The lever 75b is connected to the valve body 75a at the left end with respect to the pivot 75c in the drawing, and is connected to the central portion of the diaphragm 74 at the right end with respect to the pivot 75c in the drawing.

  Here, the right end portion of the lever 75b in the drawing is connected to the central portion of the lower diaphragm 74 and the upper interlocking plate 75g, and moves up and down integrally with the diaphragm 74 and the interlocking plate 75g.

  Further, the left end portion of the lever 75b in the drawing is applied with an urging force counterclockwise by a coil spring 75f for adjusting the urging force.

The valve body 75a is formed in a substantially disk shape that can form a valve-closed state in contact with the gate portion 75e provided on the upper portion of the cylindrical valve seat member 75d and a valve-opened state separated from the gate portion 75e. The lever 75b is connected via a universal joint 75h.
That is, the lever 75b swings through the pivot 75c, so that even when the relative angle between the valve body 75a and the gate portion 75e changes, the valve body 75a is surely fully closed to the gate portion 75e when the valve is closed. It is formed so that it can be.

  When the valve body 75a is closed, the gas introduction port 71a and the second chamber 73 are shut off. On the other hand, when the valve body 75 a is opened, the gas introduction port 71 a and the second chamber 73 are communicated with each other, and high-pressure LP gas on the gas cylinder 40 side is introduced into the second chamber 73.

  The diaphragm 74 is urged to a predetermined position in the vertical direction in the drawing by the coil springs 74a and 75f so that the pressure (gas pressure) in the second chamber 73 is within a predetermined range. That is, when the gas pressure in the second chamber 73 is equal to or lower than the predetermined pressure, the diaphragm 74 is positioned relatively downward in the drawing, the lever 75b swings in the clockwise direction in the drawing, and the valve body 75a is opened. And Thereby, the high pressure gas is introduced into the second chamber 73 from the gas introduction port 71a.

  On the other hand, when the gas pressure in the second chamber 73 exceeds a predetermined pressure and the diaphragm 74 is displaced upward in the figure, the lever 75b swings counterclockwise in the figure, closing the valve body 75a, The introduction of the high-pressure gas from the introduction port 71a to the second chamber 73 is blocked.

  That is, when driven, the gas engine ENG sucks LP gas in the second chamber 73 of the pressure regulator 70 by suction negative pressure. As a result, when the gas pressure in the second chamber 73 becomes equal to or lower than the predetermined pressure, the diaphragm 74 is displaced downward in the figure, and in conjunction with this, the valve body 75a moves upward to open the gate portion 75e, and the high pressure Of LP gas is supplied to the second chamber 73 from the gas introduction port 71a. Since the gas pressure supplied from the gas cylinder 40 is high, the diaphragm 74 is displaced upward in the figure, and in conjunction with this, the valve body 75a moves downward, the gate portion 75e is closed, and the second chamber is closed. The supply of gas to 73 is stopped. By repeating the above operation, the gas pressure in the second chamber 73 is reduced to a pressure lower than the gas pressure supplied from the gas cylinder 40 and maintained at a pressure within a predetermined range. The biasing force on the lever 75b can be adjusted by adjusting the meshing amount of the adjusting screw 75j and adjusting the upper end position of the coil spring 75f. As a result, the pressure within the predetermined range maintained by the operation of the diaphragm 74 can be adjusted.

Further, the pressure regulator 70 is provided with a forced valve opening mechanism 76.
The forced valve opening mechanism 76 includes a push rod 76a, a return spring 76b, and a solenoid 76c.

  As shown in FIG. 3, the push rod 76a is located above the connecting portion of the lever 75b with the diaphragm 74 and above the interlocking plate 75g, and is supported by the case 71 so as to be slidable in the vertical direction. ing.

  The push rod 76a is urged upward in the drawing by the return spring 76b when the solenoid 76c is not driven, and is spaced apart from the interlocking plate 75g and the lever 75b as shown in the drawing. Yes.

  On the other hand, when the solenoid 76c is driven, the plunger 76d slides downward in the drawing to push the push rod 76a downward against the urging force of the return spring 76b. As a result, the interlocking plate 75g is pushed down, and in conjunction with this, the lever 75b swings in the clockwise direction in the drawing, the valve body 75a is displaced upward, and the valve mechanism 75 can be forcibly opened. .

(Control by control unit)
Next, control by the control unit 30 will be described.
The control unit 30 operates the inverter 32 so as to supply power from the battery 31 to the load 10 and controls the battery capacity (battery SOC) of the battery 31 to always be within a predetermined range.

  The battery capacity control of the battery 31 will be briefly described with reference to the flowchart of FIG. 4. In step S101, it is determined whether or not the battery capacity has decreased below a preset lower limit threshold SOCLlim. If the battery capacity is less than or equal to the lower limit threshold SOCLlim, the process proceeds to step S102. If the battery capacity is greater than the lower limit threshold SOCLlim, the process returns to the start. The lower limit threshold SOCLlim is set to a value that can drive the load 10 for a certain period of time even when the battery capacity becomes the lower limit threshold SOCLlim, and is not a value that requires at least immediate charging.

  In step S102 that proceeds when the battery capacity is equal to or lower than the lower limit threshold SOCLlim, the battery 31 is charged. Details of this charging process will be described later.

  In step S103, which proceeds after starting the charging process, it is determined whether the battery capacity is equal to or higher than a preset upper limit threshold SOCHlim. And when battery capacity is more than upper limit threshold value SOCHlim, it progresses to Step S104 and ends charging processing. On the other hand, if the battery capacity is less than the upper limit threshold SOCHlim in step S103, the process returns to step S102 and the charging process is continued. The upper threshold value SOCHlim is set to a value indicating that the battery 31 is fully charged.

Next, the flow of the charging process executed in step S102 will be described based on the flowchart of FIG.
That is, when charging the battery 31, first, in step S201, it is determined whether or not the power supply network 20 is normal. Whether or not the power supply network 20 is normal is determined based on whether or not the detection value of the voltage sensor 36 is equal to or greater than a predetermined value, that is, the voltage of power supplied from the power supply network 20 is equal to or greater than a predetermined value. Judgment is made by whether or not there is.

  If it is determined in step S201 that the power supply network 20 is normal, the process proceeds to step S202, and the power supply switching unit 34 is controlled to the side that supplies power to the battery 31 from the power supply network 20.

  On the other hand, if it is determined in step S201 that the power supply network 20 is abnormal (for example, a power failure), the process proceeds to step S203, the on-off valve 60 is opened, and the gas engine ENG is started. Start ENG. Details of the starting process of the gas engine ENG will be described later.

  And after performing the gas engine starting process of step S203, it progresses to step S204 and controls the power supply switching part 34 to the side which supplies electric power to the battery 31 from the generator G. FIG. At this time, the fact that the power generation by the generator G has been started in response to a power failure via a network that is not shown in the figure is signaled to a signal control center that is not shown that has control over the load 10 (signal). Output a reportable signal.

  In step S204 which proceeds after the supply of generated power by the generator G is started in step S203, it is determined again whether or not the power supply network 20 is normal, that is, whether or not the power supply network 20 has been recovered from the power failure. . And when the power supply network 20 is abnormal, it returns to step S203 and the power supply from the generator G is continued. On the other hand, if the power supply network 20 is restored normally, the process proceeds to step S205, the on-off valve 60 is closed, the gas engine ENG is stopped, and then the process returns to step S201. In this case, the process proceeds to step S202, and power is supplied from the restored power supply network 20.

  As described above, when charging the battery 31, when power is normally supplied from the power supply network 20, charging is performed using the power from the power supply network 20. On the other hand, when the power supply network 20 fails, such as when a power failure occurs, the gas engine ENG is started and the power generated by the generator G is charged.

Next, the gas engine start process in step S203 will be described.
FIG. 6 is a flowchart showing the flow of the gas engine starting process.
First, the on-off valve 60 is opened in step S301. As a result, the LP gas in the gas cylinder 40 is supplied to the gas supply pipe 50.

  In step S302, the solenoid 76c is turned on a predetermined number of times or is turned on for a predetermined time. When the solenoid 76c is turned on, the plunger 76d pushes down the push rod 76a and the interlocking plate 75g, and the lever 75b swings clockwise in FIG. As a result, the valve body 75a moves upward, the gate portion 75e is opened, and high-pressure LP gas is supplied to the carburetor 80 of the gas engine ENG.

  In this case, since the valve body 75a is forcibly opened, the gas pressure exceeding the predetermined adjustment pressure of the diaphragm 74 can be supplied to the carburetor 80 side. Therefore, in the gas supply pipe 50, the gas engine side pipe portion 50b between the pressure regulator 70 and the carburetor 80 is supplied with high-pressure LP gas even in a state where only air is filled. The gas concentration can be increased to a certain level. In particular, as in the first embodiment, when the length of the gas supply pipe 50 (gas engine side pipe portion 50b) from the pressure regulator 70 to the suction side of the gas engine ENG is long, the air capacity is also large. For this reason, when the above-mentioned forced valve opening is not performed, the cranking operation time required for discharging the air becomes long.

  Therefore, the number of times or the drive time of the solenoid 76c in step S302 is determined based on the concentration of the gas mixed with the air present in the gas engine side pipe portion 50b and the concentration at which smooth startability can be obtained when cranking the gas engine ENG. Set to be able to.

  In step S303, which proceeds after the solenoid 76c is driven in step S302, the starter motor SM is driven to perform cranking of the gas engine ENG. Then, in subsequent step S304, it is determined whether or not the gas engine ENG has completely detonated. If the detonation has been completed, the gas engine start process is terminated. If the detonation is not complete, cranking is continued. The complete explosion of the gas engine ENG can be determined when the gas engine speed exceeds a predetermined speed.

(Operation of Embodiment 1)
Next, the operation of the power supply system A according to the first embodiment will be described.
In the first embodiment, power is supplied to the load 10 and the control unit 35 by discharging from the battery 31. In this case, even if the power supply to the battery 31 is any of the power supply network 20 and the generator G, and even when the power is switched, a stable power supply is always performed from the inverter 32 to the load 10. be able to. Moreover, since alternating current power is always supplied, the existing signal that is driven by the power from the power supply network 20 can be used as it is as the traffic light that is the load 10. Note that either AC power or DC power may be supplied to the control unit 35.

  Further, when the battery 31 is discharged and the battery capacity decreases and falls below the lower limit threshold SOCLlim, the battery 31 is charged. In this case, if the power supply network 20 is normal, charging is performed with the power of the power supply network 20. Therefore, the battery 31 always has a battery capacity larger than the lower limit threshold SOCLlim, and power supply to the load 10 is never stopped.

Next, a case where the power supply network 20 has a power failure (when not normal) will be described.
As described above, since the load 10 is driven by the discharged power of the battery 31, even when the power supply network 20 fails, the power supply to the load 10 does not stop immediately. Thereafter, when the battery capacity is reduced below the lower limit threshold SOCLlim due to the discharge of the battery 31, the gas engine ENG is started, the power generation of the generator G is started, and the battery 31 is charged with the generated power.

  When starting the gas engine ENG, first, the on-off valve 60 is opened, and further, the solenoid 76c is driven (ON). Thereby, in the pressure regulator 70, LP gas whose pressure is higher than the pressure adjusted by the diaphragm 74 is supplied to the gas engine side pipe portion 50b of the gas supply pipe 50, and the gas concentration in the gas engine side pipe portion 50b is improved. The concentration can be such that startability can be obtained.

  Thereafter, the gas engine ENG is cranked and the gas engine ENG is started. At this time, since the high-concentration LP gas is supplied to the gas engine side pipe portion 50b, it can be started smoothly.

  That is, when the forced opening by the drive of the solenoid 76c is not performed, air is present in the gas engine side pipe portion 50b before the gas engine ENG is cranked. When the gas engine ENG is cranked from this state, the LP gas decompressed to a predetermined pressure is supplied from the pressure regulator 70. Therefore, until the air existing before the LP gas is supplied is exhausted to the gas engine ENG. The LP gas of the desired concentration is not inhaled, and during that time it is difficult to start the gas engine ENG.

  When the cranking operation is performed by a person, it can be repeated until the gas engine ENG is completely detonated. However, when the gas engine ENG is automatically started at the time of a power failure of the power supply network 20 as in the first embodiment, the gas engine ENG may not be started even if the cranking is repeated a predetermined number of times. In this case, the driving of the traffic light as the load 10 is stopped, which may cause traffic disruption.

On the other hand, in the first embodiment, before cranking the gas engine ENG, the solenoid 76c is driven to automatically open the valve mechanism 75 of the pressure regulator 70, and the pressure regulator 70 High pressure LP gas is supplied without pressure reduction by the automatic pressure control function. For this reason, even if the air exists in the gas engine side pipe part 50b, the P gas of the density | concentration which can obtain favorable startability in the gas engine ENG can be supplied to the gas engine side pipe part 50b.
Therefore, even in the automatic cranking operation, it is possible to reliably start the gas engine ENG and supply power to the battery 31 so that the driving of the load 10 does not stop.

  Furthermore, in the first embodiment, the power supply source supplies power from the battery 31 to the load 10 in both cases of the power supply network 20 and the generator G. For this reason, when the power supply source is switched, the power supply to the load 10 does not become unstable, and the operation of the load 10 can be stabilized. Furthermore, even if the power supply (voltage) of the generator G becomes unstable, the unstable power is not directly supplied to the load 10, and the operation of the load 10 can be always stabilized. .

(Effect of Embodiment 1)
The effects of the gas engine starting device and the power supply system according to Embodiment 1 are listed below.
1) The power supply system of Embodiment 1 is
A battery 31 and an inverter 32 for supplying AC power to the load 10;
A power supply network 20 and a generator G as a power source for charging the battery 31,
A power supply switching unit 34 that switches between supplying power to the battery 31 from the power supply network 20 and switching from the generator G;
A control unit 35 for controlling the switching operation of the power supply switching unit 34;
It was set as the power supply system provided with.
Therefore, it is possible to always stably supply power from the battery 31 and the inverter 32 to the load 10 without being affected by the power supply state of the power supply network 20 or the generator G or the influence of the switching. . Therefore, the load 10 can always be operated stably.
Moreover, since the battery 31 is charged by supplying power from either the power supply network 20 or the generator G, the power supply to the load 10 can be stabilized. In particular, when power is supplied from the generator G, the generated power may become unstable, such as solar power generation, hydropower, wind power generation, and power generation by an engine. However, since the generated power is once stored in the battery 31, even if the generated power becomes unstable, the load 10 is not directly affected, and stable power supply is possible.

2) The power supply system of Embodiment 1
The control unit 35 supplies power from the power supply network 20 to the battery 31 when the power supply network 20 is normal, and supplies power from the generator G to the battery 31 when the power supply network 20 is abnormal. The power supply switching unit 34 is controlled.
Therefore, the battery 31 can be charged even in the event of an abnormality such as a power failure of the power supply network 20 so that the power supply to the load 10 does not stop.

3) The power supply system of Embodiment 1 is
The generator G generates power by driving a gas engine ENG as an engine,
When the power supply network 20 is not normal, the control unit 35 starts the gas engine ENG to automatically generate the generator G.
Therefore, when an abnormality such as a power failure of the power supply network 20 occurs, the generator G can automatically generate power to supply power to the battery 31. And since it is power generation by the gas engine ENG, it always generates power stably and supplies power to the battery 31 compared with power generation using natural power such as solar power generation, hydroelectric power generation, wind power generation, etc. can do. Thereby, the operation of the load 10 can be stabilized.

4) The power supply system of Embodiment 1
The engine that generates power from the generator G is a gas engine ENG that is driven by burning the liquefied gas supplied from the gas cylinder 40.
Therefore, when using the engine as a drive source of the generator G, there is no risk of the fuel volatilizing compared to the engine using a liquid fuel such as a diesel engine, and it is easy to ensure a large capacity. Enables long-term power generation when there are 20 abnormalities. For example, if two gas cylinders 40, 40 are used as in the first embodiment, continuous power generation for 72 hours or more is possible.

As described above, the power supply system of the present disclosure has been described based on the embodiment. However, the specific configuration is not limited to the embodiment, and the gist of the invention according to each claim of the claims is described. Unless it deviates, design changes and additions are allowed.
For example, in the embodiment, a traffic signal is shown as a load, but the load is not limited to a traffic signal. That is, as long as the load is intended to avoid a drive stop due to a power failure, for example, lighting, a monitoring camera, a security device, an alarm device, and the like can be applied as the load.

Further, for example, the drive source of the generator is not limited to a gas engine, and a generator driven by liquid fuel such as a diesel engine may be used. Furthermore, as the generator, in addition to the power generated by the engine, a power generated by sunlight, a natural power generator that generates power by wind power, hydraulic power, geothermal heat, or the like may be used. In this case, as a control of the control unit, when the natural power generator generates power, the power generated by the generator is supplied and charged to the battery, and when the generator is not generating power, power from the power supply network is supplied to the battery. It is also possible to charge.
Furthermore, in addition to the above-mentioned natural power generators using sunlight, wind power, hydropower, geothermal power, etc., an engine generator that generates power by driving the engine is also used in combination with a natural power generator at the time of power failure of the power supply network. The non-generator may start the engine generator.

  In the embodiment, the gas engine is automatically started. However, the present invention is not limited to this. However, the gas engine may be started by a human start operation, for example, a switch operation or a remote start operation to generate power. Good.

DESCRIPTION OF SYMBOLS 10 Load 20 Electric power supply network 30 Control unit 31 Battery 32 Inverter 34 Power supply switching part 35 Control part 40 Gas cylinder A Power supply system ENG Gas engine G Generator

Claims (4)

A battery and an inverter for supplying AC power to the load;
A power supply network and a generator as a power source for charging the battery;
A power supply switching unit that switches between supplying power to the battery from the power supply network and switching from the generator;
A control unit for controlling the switching operation of the power supply switching unit;
Power supply system comprising. The power supply system according to claim 1,
The control unit is configured to charge the power supply network when the power supply network is normal, and to control the power supply switching unit so as to perform charging from the generator when the power supply network is abnormal. system. The power supply system according to claim 1 or 2,
The generator generates electricity by driving the engine,
The control unit is a power supply system that starts the engine and automatically generates power when the power supply network is abnormal. In the power supply system according to any one of claims 1 to 3,
The engine is a power supply system that is a gas engine that is driven by burning liquefied gas supplied from a gas cylinder.