JP4514914B2 - Power conditioner starting method, power conditioner starting device, and photovoltaic power generation system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a power conditioner, a starting method of the power conditioner, a starting device, and a solar power generation system including the same, and more particularly, snow falling on a solar cell or snow melting to melt ice (snow melting). The present invention relates to a power conditioner having a function, a method for starting snowfall operation of the power conditioner, a starter, and a solar power generation system.
[0002]
[Prior art]
The solar power generation system includes a solar cell and a power conditioner. The power conditioner processes a normal power conversion function for AC conversion of the power generation output of the solar cell and a system power source to process the solar power. There is a battery having a snowfall function for supplying a heat generation current to the battery to cause snowfall.
[0003]
This power conditioner generally includes at least a DC / DC converter, a smoothing capacitor, an inverter, a microcomputer built-in control device, and a system-side switch.
[0004]
In such a system, the power generation output of the solar cell is boosted by a DC / DC converter, smoothed by a smoothing capacitor, converted to AC power by an inverter, and supplied to a load under the control of a microcomputer in the control device. However, if this supplied power is surplus, the surplus power is caused to reversely flow to the system power supply connected to the system-side switch, and the solar cell is not generating or lacking power at night or in the rain. When the AC power supplied to the load is insufficient, the system power can be supplied.
[0005]
In the case where sunlight is blocked by snow or ice on the solar cell, the system-side switch is turned on and the inverter is switched to full wave in order to perform snowfall operation that melts and removes the snow or ice. By functioning as a rectifier circuit, the AC power from the system power supply is full-wave rectified, the full-wave rectified output is smoothed by a smoothing capacitor, and the DC / DC converter is functioned as a step-down circuit to step down the smoothed output. The solar cell generates heat by the output subjected to the step-down process, and the snow on the solar cell is melted and dropped by using the generated heat.
[0006]
[Problems to be solved by the invention]
In such a conventional power conditioner, since the power generation output of the solar cell cannot be obtained at night, the power conditioner itself cannot obtain a control power source, or it cannot operate, or the internal capacitor is not installed. In this state, when the system side switch is turned on and the system power supply is connected to start the snowfall operation, the charging current (rush current) is passed through the system side switch. As a result of flowing into the capacitor, the system side switch was damaged, and snowfall operation at night could not be performed.
[0007]
The present invention has been made in view of the above-described points, and an object thereof is to perform a snowfall operation at night.
[0008]
[Means for Solving the Problems]
The present invention is configured as follows in order to achieve the above-described object.
[0009]
That is, the method of starting the power conditioner of the present invention is to turn on the system-side switch connected to the system power supply, process the output of the system power supply, supply a heating current to the solar battery, and A method for starting a snowfall operation of a power conditioner having a snowfall function for melting snow and snow, and supplying a power supply for start-up and a snowfall command signal from a starter to the power conditioner, and the power conditioner In response to the snowfall command signal, it is detected that the internal capacitor has been charged by the start-up power supply, and the system-side switch is turned on to start the snowfall operation.
[0010]
Here, ice and snow includes snow, frozen ice, or both, and snowfall refers to melting ice and snow.
[0011]
According to the present invention, the starting power supply and the snowfall command signal are given to the power conditioner from the starting device, and the power conditioner detects that the internal capacitor is charged by the starting power supply and turns on the system-side switch. Therefore, even during the night when the internal capacitor is in an uncharged state, the snowfall operation will start after the capacitor is charged by the start-up power supply, and the charging current ( The system side switch is not damaged by the inrush current. Further, since the starting power source can be used as a control power source for the power conditioner, there is no problem that the power conditioner cannot be operated.
[0012]
In one embodiment of the present invention, the starter outputs a start-up power supply and a snowfall command signal based on an operation for starting a snowfall operation, and the power conditioner has an internal capacitor connected to the start-up power supply. Detecting that the battery is charged by the power supply, and outputting a start-up power supply stop signal to the start-up device, and the start-up device stops the start-up power supply in response to the supply stop signal. .
[0013]
Here, the operation for starting the snowfall operation is not limited to the switch operation for starting the snowfall operation, but includes a timer setting operation for starting the snowfall operation.
[0014]
According to the present invention, by performing an operation for starting a snowfall operation on the starter, the power conditioner is supplied with a start power supply and a snowfall command signal, and the snowfall operation is started. The power conditioner may be supplied as much as necessary to start the snowfall operation, and the size can be reduced.
[0015]
The starter of the power conditioner of the present invention turns on the system-side switch connected to the system power supply, processes the output of the system power supply, supplies the solar cell with heat generation current, and removes ice and snow on the solar cell. A starter for snowfall operation of a power conditioner having a snowfall function for melting and falling snow, supplying starter power to the DC input side of the power conditioner and snowfalling to a control unit of the power conditioner A command signal is output.
[0016]
According to the present invention, it is possible to provide a power supply for startup and a snowfall command signal to the power conditioner. In the power conditioner of the present invention, the snowfall operation is started after the internal capacitor is charged by the power supply for startup. Therefore, the system side switch is not damaged by the charging current (inrush current) from the system power supply.
[0017]
In another embodiment of the present invention, an operation unit that is operated to start a snowfall operation is provided, and the start-up power is supplied and the snowfall command signal is output based on the operation of the operation unit. On the other hand, in response to a supply stop signal from the power conditioner, the supply of the startup power supply is stopped.
[0018]
According to the present invention, by operating the operation unit, it is possible to perform a snowfall operation by supplying a power supply for start-up and a snowfall command signal to the power conditioner, and start in response to a supply stop signal from the power conditioner. Since the supply of power for operation can be stopped, it is possible to supply only the power necessary for starting.
[0021]
Photovoltaic power generation system of the present invention, a solar cell, and Rupa word conditioner connected between said solar cell and a system power supply, and activation device of the power conditioner of the present invention which is connected to the power conditioner The power conditioner turns on a system-side switch connected to a system power supply, and supplies a heating current to a solar cell connected to the system power supply via the power conditioner, The snow on the solar cell is melted and snow falls, and it detects that the internal capacitor is charged in response to a snow fall command signal from the outside, and Turn it on and start snow driving.
[0022]
According to the present invention, snowfall operation can be performed without damaging the system-side switch even at night when the internal capacitor is in a non-charged state.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0024]
(Embodiment 1)
FIG. 1 is a configuration diagram of a photovoltaic power generation system according to an embodiment of the present invention.
[0025]
The solar power generation system according to this embodiment includes a solar cell 1, a power conditioner 2 according to the present invention, and a snowfall start box 4 as a power conditioner starter according to the present invention.
[0026]
The power conditioner 2 treats the system power supply 3 with a normal power conversion function for AC-converting the power generation output of the solar battery 1 between the solar battery 1 and the system power supply 3 and interconnecting with the system. 1 is provided with a snowfall function for supplying a heat generation current to the snowboard 1 to snow the snow on the solar cell 1.
[0027]
The snowfall starting box 4 is connected to the DC input side of the power conditioner 2 via the backflow prevention diode 7 and is connected to the power conditioner 2 via the control signal line.
[0028]
The snowfall start box 4 is for causing the power conditioner 2 to perform snowfall operation at night when the power generation output of the solar cell 1 cannot be obtained, and is operated when the snowfall operation is started. When the snowfall start switch 5 is operated and the snowfall start switch 5 is operated, the AC power from the system power supply 6 is rectified and smoothed as described later, and the power input side of the power conditioner 2 is used as a power source for starting snowfall operation. And a snowfall operation command signal is output to the power conditioner 2 through a control line.
[0029]
FIG. 2 is a detailed circuit diagram of the power conditioner 2 and the snowfall starting box 4 of FIG.
[0030]
The power conditioner 2 includes a control circuit 2f including a first filter 2a, a first smoothing capacitor C3, a DC / DC converter 2b, a second smoothing capacitor C4, an inverter 2c, a second filter 2d, a system side switch 2e, and a microcomputer. It has.
[0031]
In the interconnected operation for performing normal power conversion, the control circuit 2f turns off the transistor TR2 in the DC / DC converter 2b, switches the transistor TR1, and drives the transistors TR3 to TR6 in the inverter 2c. Then, the system side switch 2e is driven on or off as necessary.
[0032]
In such a normal interconnection operation state, the power generation output of the solar cell 1 is smoothed by the first smoothing capacitor C3 via the first filter 2a, and then the switching operation of the transistor TR1 in the DC / DC converter 2b. Is boosted. In this case, the DC / DC converter 2b functions as a boost chopper. The power generation output of the solar cell 1 boosted by the DC / DC converter 2b is smoothed by the second smoothing capacitor C4, input to the inverter 2c, and converted into alternating current by the inverter 2c. The power generation output of the solar cell 1 converted into alternating current is converted into a sine wave by the second filter 2d and supplied to a load (not shown) or is reversely flowed to the system power supply 3 side via the system switch 2e. The In this case, the control circuit 2f monitors the power generation output of the solar cell 1 and the output of the inverter 2c, and performs a required control operation.
[0033]
When there is a snowfall operation command input described later, the control circuit 2f switches the transistor TR2 in the DC / DC converter 2b and drives the system side switch 2e on.
[0034]
In such a snowfall operation state, the system power supply 3 is input to the inverter 2c via the system side switch 2e and the second filter 2d. Since each of the transistors TR3 to TR6 in the inverter 2c is off, the output of the system power supply 3 is full-wave rectified by diodes D3 to D6 parallel to the transistors TR3 to TR6, and then smoothed by the second smoothing capacitor C4. It becomes. Note that the transistors TR3 to TR6 may be operated instead of full-wave rectification by the diodes D3 to D6.
[0035]
This smoothed snowfall power supply output is stepped down by the switching operation of the transistor TR2 in the DC / DC converter 2b. In this case, the DC / DC converter 2b functions as a step-down chopper. The output of the system power supply 3 stepped down by the DC / DC converter 2b in this way is given to the solar cell 1 through the first smoothing capacitor C3 and the first filter 2a. The solar cell 1 generates heat due to the output of the system power supply 3 and falls as a heating element. Although not shown in the figure, the power generation output of the solar cell 1 is taken into the power conditioner 2 via a backflow prevention diode, and a switch parallel to this backflow prevention diode is turned on during snowfall operation. Then, the system power supply 3 output that has been stepped down is supplied to the solar cell 1 to cause the solar cell 1 to generate heat.
[0036]
As described above, since the power generation output of the solar cell 1 cannot be obtained at night, the power conditioner 2 itself cannot obtain a control power source and cannot operate or the internal smoothing capacitor C4 is not charged. In this state, when the system side switch 2e is turned on and the system power supply 3 is connected to start the snowfall operation, the charging current (rush current) is passed through the system side switch 2e. As a result, the system side switch 2e is damaged as a result of flowing into the smoothing capacitor C4.
[0037]
Therefore, in this embodiment, a snowfall start box 4 is provided so that snowfall operation at night can be performed.
[0038]
The snowfall start box 4 includes a switch 8 that is turned on when supplying start power to the DC input side of the power conditioner 2, a coil L6, a transistor TR7, a capacitor C6, and a full-wave rectifier circuit. 9, a transformer 10, a control circuit 11, and the snowfall start switch 5 described above.
[0039]
When the snowfall start switch 5 is operated, the control circuit 11 composed of a microcomputer performs full-wave rectification on the output of the system power supply 6 via the transformer 10 by the full-wave rectification circuit 9, smoothes it to a direct current by the smoothing capacitor C6. At the same time, the transistor TR7 and the switch 8 are turned on to supply the starting power to the DC input side of the power conditioner 2, while a snowfall operation command signal is output to the control circuit 2f of the power conditioner 2. To do.
[0040]
In other words, when the snowfall start switch 5 is operated at night or the like, the snowfall start box 4 supplies the power conditioner 2 with start-up power and outputs a snowfall operation command signal.
[0041]
On the other hand, in the power conditioner 2, the smoothing capacitor C4 is charged by the activation power supplied from the snowfall activation box 4 at night when the power generation output of the solar cell 1 cannot be obtained, and the control power is obtained. The control circuit 2f starts to operate, detects whether or not the smoothing capacitor C4 is charged in response to the snow falling operation command signal, depending on whether or not the input voltage exceeds the set voltage, and exceeds the set voltage. When the charging of the smoothing capacitor C4 is completed, the start power supply stop signal is output to the snowfall start box 4, while the system side switch 2e is turned on and the system power supply 3 is turned on as described above. It processes and supplies to the solar cell 1, and a snowfall operation is started.
[0042]
FIG. 3 is a flowchart for explaining the above operation. FIG. 3A shows the operation of the snowfall start box 4 and FIG. 3B shows the operation of the power conditioner 2.
[0043]
As shown in FIG. 6A, first, when the snowfall start switch 5 of the snowfall start box 4 is operated (step n1), the starter power supply that rectifies and smoothes the output of the system power supply 6 is connected to the transistor TR7 and While supplying to the power conditioner 2 via the switch 8, it outputs a snowfall operation command signal to the power conditioner 2 (step n2).
[0044]
As shown in FIG. 4B, the power conditioner 2 is supplied with a start-up power supply, thereby starting a control operation by a control power supply based on the start-up power supply (step n6). (Step n7), and when there is a snowfall operation command signal input, it is determined whether or not the smoothing capacitor C4 is charged based on whether or not the input voltage is equal to or higher than the set voltage. (Step n8) When the voltage exceeds the set voltage, the system side switch 2e is turned on and the system power supply 3 is connected (step n9), assuming that the smoothing capacitor C4 has been charged. Then, the start power supply stop signal is output (step n10), and the snowfall operation is started (step n11). In step n7, when there is no snow falling operation command signal input, normal interconnection operation is performed (step n12). That is, based on the presence / absence of a snowfall operation command signal, it is possible to determine whether it is snowfall operation or normal interconnection operation.
[0045]
As shown in FIG. 5A, the snowfall start box 4 determines whether or not the start power supply stop signal is input (step n4). The power supply for starting is stopped by turning off (step n5).
[0046]
(Other embodiments)
In the above-described embodiment, the starter power supply is supplied to the power conditioner 2 in response to the operation of the snowfall start switch 5 and the snowfall operation command signal is output. However, as another embodiment of the present invention, a timer It is possible to automatically start snowfall operation at night according to the timer setting, or to detect that it has become dark at night by the sensor and automatically supply power for starting, and snowfall operation A command signal may be output.
[0047]
In the above-described embodiment, the system power supply 6 is rectified and smoothed to obtain a start-up power supply. However, as another embodiment of the present invention, a battery may be provided and the start-up power supply may be supplied from the battery. .
[0048]
【The invention's effect】
As described above, according to the present invention, the starting power supply and the snowfall command signal are given to the power conditioner from the starting device, and the power conditioner detects that the internal capacitor is charged by the starting power supply and Since the snowfall operation is started with the switch turned on, even during the night when the internal capacitor is in a non-charged state, the system side switch is not damaged by the charging current (rush current) from the system power supply. Can drive.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a photovoltaic power generation system according to an embodiment of the present invention.
2 is a detailed circuit diagram of the inverter of FIG. 1 and a snowfall start box. FIG.
FIG. 3 is a flowchart for explaining an operation;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Solar cell 2 Power conditioner 2f, 11 Control circuit 3, 6 System power supply 4 Snowfall starting box (starting device)
5 Snowfall start switch

Claims (5)

By turning on the system-side switch connected to the system power supply and supplying heat generation current to the solar battery connected to the system power supply via the power conditioner, the ice and snow on the solar battery is melted. It is a start method of the snowfall operation of the inverter that is designed to fall snow,
A power supply for start-up and a snowfall command signal are given to the power conditioner from the starter,
In response to the snow fall command signal, the power conditioner detects that an internal capacitor has been charged by the start-up power supply, and turns on the system-side switch to start a snow fall operation. How to start the inverter.   The starter outputs a start-up power supply and a snowfall command signal based on an operation for starting snowfall operation, and the power conditioner detects that an internal capacitor is charged by the start-up power supply. The power conditioner start-up method according to claim 1, wherein a start-up power supply stop signal is output to the start-up device, and the start-up device stops the start-up power supply in response to the supply stop signal. By turning on the system-side switch connected to the system power supply and supplying heat generation current to the solar battery connected to the system power supply via the power conditioner, the ice and snow on the solar battery is melted. A snow conditioner starter for a power conditioner designed to snow.
A starter for a power conditioner, wherein a starter power is supplied to a DC input side of the power conditioner and a snow fall command signal is output to a control unit of the power conditioner.   An operation unit that is operated to start a snowfall operation is provided. Based on the operation of the operation unit, the activation power is supplied and the snowfall command signal is output, while the supply from the power conditioner is stopped. 4. The starter for a power conditioner according to claim 3, wherein the start-up power supply is stopped in response to a signal. It includes a solar cell, and Rupa word conditioner connected between said solar cell and a system power supply, and a trigger device of the power conditioner according to claim 3 or 4, wherein connected to the power conditioner,
The power conditioner turns on a system-side switch connected to a system power supply, and supplies a heating current to the solar battery connected to the system power supply via the power conditioner. The above ice and snow are melted to fall, and it detects that the internal capacitor is charged in response to an external snow fall command signal and turns on the system side switch. A solar power generation system characterized by starting snowfall operation .

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