Photovoltaic water pump power supply system

Abstract

The utility model discloses a photovoltaic water pump power supply system, which belongs to the technical field of photovoltaic power supply and is mainly used for water pump power supply in dry and hot valley regions. The utility model provides a photovoltaic pump power supply system which comprises a solar photovoltaic panel, an energy storage device, a water pump, a step-down transformer, a first inverter, a second inverter and a step-up transformer, and the solar photovoltaic panel, the first inverter and the water pump are connected one by one. The solar photovoltaic panel, the step-down transformer, the second inverter, the energy storage device, the step-up transformer and the water pump are connected one by one; the energy storage device comprises a storage battery, the output end of the storage battery is electrically connected with a charging controller, the output end of the storage battery is electrically connected with a discharging controller, and the discharging controller is connected with a light sensor. According to the photovoltaic water pump power supply system, the two power supply lines are arranged between the solar photovoltaic panel and the water pump, so that the water pump power supply system is not affected by weather any more, stable power supply of the water pump is guaranteed, and the service life of the water pump is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic power supply, in particular to a photovoltaic water pump power supply system. Background Art

[0002] Dry and hot valleys refer to high-temperature, low-humidity valley areas with little precipitation and high evaporation. my country's dry and hot valleys are mainly distributed in Panzhihua, Sichuan, Yunnan and Guizhou along the Jinsha River, Yuanjiang River, Nujiang River and Nanpanjiang River. Most of them are distributed in tropical and subtropical areas, with harsh climate and high altitude. The region has hot and dry climate all year round, sparse vegetation and poor ecological environment. Most of the hilltops appear as bare red soil, but the region is rich in light resources, and the annual sunshine can usually reach more than 2700h. In order to solve the water problem of local residents, solar irrigation stations are now installed in dry and hot areas to make full use of solar photovoltaic panels to convert the local abundant light resources into electricity to power water pumps. However, the power supply of photovoltaic power stations is affected by the weather, especially at night and in rainy weather, the power supply capacity of photovoltaic power stations decreases, and the power supply to the water pumps at the foot of the mountain is unstable, and it is unable to provide sufficient electricity to the water pumps, resulting in intermittent operation of the water pumps and shortening the service life of the water pumps. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a photovoltaic water pump power supply system, which is mainly used for powering water pumps in dry and hot river valleys, so as to achieve the purpose of not being affected by weather and providing stable power supply for water pumps.

[0004] The utility model discloses a photovoltaic water pump power supply system, comprising a solar photovoltaic panel, an energy storage device, a water pump, a step-down transformer, a first inverter, a second inverter and a step-up transformer, wherein the output end of the solar photovoltaic panel is connected to the input end of the first inverter, and the output end of the first inverter is connected to the water pump; the output end of the solar photovoltaic panel is also connected to the input end of the step-down transformer, the output end of the step-down transformer is connected to the input end of the second inverter, the output end of the second inverter is connected to the input end of the energy storage device, the output end of the energy storage device is connected to the input end of the step-up transformer, and the output end of the step-up transformer is connected to the water pump; the energy storage device comprises a battery, a charging controller and a discharging controller, the charging controller is electrically connected to the output end of the battery, the discharging controller is electrically connected to the output end of the battery, and a light sensor is also connected to the discharging controller.

[0005] Furthermore, the battery is provided with a power sensor, and the power sensor is connected to the charge and discharge controller.

[0006] Furthermore, it also includes a battery cooling device, which includes a shell, the shell covers the outside of the battery, a cover is provided outside the shell, there is a gap between the cover and the shell for circulating coolant, and the cover is provided with a water inlet and a water outlet for the coolant to enter and exit.

[0007] As a preferred embodiment, a water inlet is provided at the top of the cover shell, a water outlet and a gravity sensor are provided at the bottom of the cover shell, a valve is provided at the water outlet, and the valve is electrically connected to the gravity sensor.

[0008] As a preferred embodiment, the water inlet is provided with a pump body, and the pump body is connected to the output end of the energy storage device.

[0009] As a preferred embodiment, at least two battery storage spaces are provided in the housing, and the storage batteries are arranged in the battery storage spaces and are connected in series one by one.

[0010] As a preferred manner, the battery is connected to the housing by bolts.

[0011] Furthermore, the battery is a vanadium battery.

[0012] The beneficial effects of the utility model are as follows: by setting two lines connected to the water pump behind the solar photovoltaic panel, the solar photovoltaic panel is connected to the first inverter and the water pump, so as to ensure that the water pump is powered by solar energy on sunny days; a step-down transformer connected to the solar photovoltaic panel is set, and a second inverter and an energy storage device connected in series with the step-down transformer are set, the power of the solar photovoltaic panel is stored in the battery of the energy storage device, and the light intensity is monitored by the light sensor. When the light intensity is low, that is, when it is rainy or at night, the battery is discharged, and then the step-up transformer increases the discharged amount of the battery to a voltage that can be used for the operation of the water pump; when the light intensity is high, the solar photovoltaic panel directly supplies power to the water pump, and the light sensor sends a signal to the discharge controller of the battery to control the battery to stop discharging, so that the water pump power supply system is no longer affected by the weather, and can ensure the stable power supply of the water pump, avoid the intermittent operation of the water pump due to unstable power supply, and ensure the service life of the water pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 : Schematic diagram of the photovoltaic water pump power supply system of the utility model;

[0014] Figure 2 : A schematic structural diagram of a battery cooling device of the present utility model.

[0015] Figure numerals: 11 - battery; 111 - housing; 12 - cover; 121 - battery storage space; 13 - water inlet; 131 - pump body; 14 - water outlet; 141 - valve. DETAILED DESCRIPTION

[0016] The utility model is further described below.

[0017] The utility model provides a photovoltaic water pump power supply system, which is mainly used for powering water pumps in dry and hot valley areas, and comprises a solar photovoltaic panel, an energy storage device, a water pump, a step-down transformer, a first inverter, a second inverter and a step-up transformer, wherein the output end of the solar photovoltaic panel is connected to the input end of the first inverter, and the output end of the first inverter is connected to the water pump; the output end of the solar photovoltaic panel is also connected to the input end of the step-down transformer, the output end of the step-down transformer is connected to the input end of the second inverter, the output end of the second inverter is connected to the input end of the energy storage device, the output end of the energy storage device is connected to the input end of the step-up transformer, and the output end of the step-up transformer is connected to the water pump; the energy storage device comprises a battery 11, a charging controller and a discharging controller, the charging controller is electrically connected to the output end of the battery 11, the discharging controller is electrically connected to the output end of the battery 11, and a light sensor is also connected to the discharging controller.

[0018] like Figure 1As shown, the output end of the solar photovoltaic panel is connected to two lines. The output end of the solar photovoltaic panel is connected to the input end of the first inverter, and the output end of the first inverter is connected to the water pump. The direct current output by the solar photovoltaic panel is converted into alternating current for normal operation of the water pump through the first inverter, thereby achieving the purpose of using solar energy to power the water pump on sunny days, so that the water pump can supply water to residents in the dry and hot valley area; the output end of the solar photovoltaic panel is also connected to a step-down transformer, and the step-down transformer is connected in series with a second inverter, an energy storage device and a step-up transformer in sequence, and the output end of the step-up transformer is connected to the water pump. Note that the path formed by the step-down transformer, the second inverter, the energy storage device and the step-up transformer is the same as the path directly formed by the solar photovoltaic panel, the first inverter and the water pump. It is a parallel circuit; since the current output by the solar photovoltaic panel cannot be directly charged into the energy storage device, the solar photovoltaic panel is connected to a step-down transformer, and the 380V voltage is reduced to 16.5V by the step-down transformer, and then the DC power is converted into AC power by the second inverter to meet the charging conditions of the battery 11, and then the battery 11 is controlled by the charging controller to start storing electricity, and then the battery 11 is controlled to discharge by the discharge controller. Since the current output by the battery 11 cannot be directly used to power the water pump, a step-up transformer is also provided at the output end of the battery 11 to increase the 16.5V AC power to 380V, and then input it into the water pump to power the water pump to ensure the normal operation of the water pump; wherein the discharge controller is electrically connected to the optical sensor, and the optical sensor is used to The surrounding sunlight intensity is identified to judge the weather conditions and whether the battery 11 needs to discharge to power the water pump. Specifically, when the light sensor detects that the light intensity is lower than 5000 lux, that is, it is rainy or at night, the light sensor sends a signal to the discharge controller, and the discharge controller controls the battery 11 to start discharging, and the energy storage device powers the water pump to ensure that when the water pump cannot be powered by solar energy on rainy days or at night, there is another power supply line to power the water pump, so that the water pump can supply water to residents in the dry and hot valley area; in other cases, the light sensor sends a signal to the discharge controller, and the discharge controller controls the battery 11 to stop discharging, and the solar photovoltaic panel directly powers the water pump to maintain the water supply of the water pump; the above-mentioned light sensor can adopt solar photovoltaic panels. The solar sensor can identify cloudy days, overcast days, semi-cloudy days, sunny days and daytime at night, thereby ensuring that the energy storage device can discharge in time when the solar photovoltaic panel cannot power the water pump, thereby ensuring the stable operation of the water pump and providing stable water supply for residents in the dry and hot valley area; at the same time, since the line where the energy storage device is located is a parallel line with the direct power supply line for the water pump provided by the solar photovoltaic panel, it will not affect the stability of the solar photovoltaic panel powering the water pump, and due to the setting of the parallel line, when the solar photovoltaic panel cannot provide stable power supply for the water pump in rainy days or at night, the energy storage device can provide stable power supply for the water pump, so that the water pump power supply system is no longer affected by the weather, and can ensure stable power supply for the water pump, avoid intermittent operation of the water pump due to unstable power supply, and ensure the service life of the water pump.

[0019] In order to monitor the charging and discharging conditions of the battery 11 in real time and avoid overcharging or undercharging, a power sensor is provided on the battery 11, and the power sensor is electrically connected to the charging controller and the discharging controller; the power sensor monitors the power of the battery 11 in real time during the charging and discharging process. When the charging threshold of the battery 11 is reached, the power sensor sends a signal to the charging controller, and the charging controller controls the battery 11 to stop charging; when the discharging threshold of the battery 11 is reached, the power sensor sends a signal to the discharging controller, and the discharging controller controls the battery 11 to stop discharging, thereby avoiding overcharging or undercharging of the battery 11, improving the use efficiency of the battery 11, and ensuring the service life of the battery 11.

[0020] When the battery 11 is continuously charged and discharged, the temperature of the battery 11 itself continues to rise. In addition, in a dry and hot valley area with a hot climate and a harsh environment, when the temperature of the battery 11 is too high, the service life of the battery 11 will be shortened. Therefore, a cooling device needs to be provided outside the battery 11. Specifically, Figure 2 As shown, the battery cooling device also includes a housing 111, the housing 111 is wrapped around the outside of the battery 11, a cover 12 is arranged outside the housing 111, a gap is provided between the cover 12 and the housing 111 for circulating the coolant, and the cover 12 is provided with a water inlet 13 and a water outlet 14 for the coolant to enter and exit; by providing the housing 111 and the cover 12 with a gap between the two, the housing 111 is wrapped around the outside of the battery 11, and the cover 12 is provided with a water inlet 13 and a water outlet 14 for the coolant to enter and exit The water inlet 13 is used to fill the coolant into the gap between the cover 12 and the shell 111, and the coolant is used to cool the battery 11 in the shell 111. To ensure the cooling effect, a water outlet 14 is provided on the cover 12 to ensure that the coolant can flow in the gap between the cover 12 and the shell 111; to save costs, the coolant can be water, and a water reservoir is provided outside the energy storage device, and the water outlet 14 and the water inlet 13 are connected to the water reservoir through pipes, so that the coolant can be reused to save costs.

[0021] To ensure the cooling effect, the battery 11 is fully cooled to ensure the power supply efficiency of the battery. Figure 2As shown, a water inlet 13 is provided at the top of the cover shell 12, a water outlet 14 and a gravity sensor are provided at the bottom of the cover shell 12, a valve 141 is provided at the water outlet 14, a valve 141 controller for controlling the opening and closing of the valve 141 is provided on the valve 141, and the valve 141 controller is electrically connected to the gravity sensor; a water outlet 14 and a gravity sensor are provided at the bottom of the shell 111, and the gravity sensor is used to monitor the weight in the entire cover shell 12, that is, the amount of coolant entering the cover shell 12. When the weight reaches a set threshold, that is, the coolant fills the gap between the cover shell 12 and the shell 111, The gravity sensor will send a signal to the valve 141 controller, and the valve 141 controller will control the valve 141 to open; when the water inlet 13 stops injecting coolant into the cover 12, the weight monitored by the gravity sensor will gradually decrease until it drops to the minimum value, that is, the weight without coolant. At this time, the gravity sensor will send a signal to the valve 141 controller, and the valve 141 controller will control the valve 141 to close; the heat generated by the battery 11 due to charging and discharging is continuously taken away by the coolant that is always circulating, so as to achieve sufficient cooling of the battery 11 and ensure its normal working life.

[0022] In order to enable the battery cooling device to automatically cool down the battery 11, the water inlet 13 is provided with a pump body 131, and the pump body 131 is connected to the output end of the energy storage device. The pump body 131 is connected to the output end of the energy storage device in parallel, thereby ensuring that when the battery 11 is working, the pump body 131 also starts working, that is, the battery cooling device and the energy storage device work at the same time.

[0023] To expand the power reserve, Figure 2 As shown, at least two battery storage spaces 121 are provided in the shell 111, and the batteries 11 are arranged in the battery storage spaces 121 and connected in series one by one; specifically, there are 4 to 8 battery storage spaces 121 and are arranged in a square array in the shell 111, and each battery storage space 121 is provided with a battery 11 with a maximum charging current of 80A and a charging voltage of 16.5V. The discharge voltage of a single battery 11 is 10V and the discharge capacity is 30Ah. The positive and negative poles of the above batteries 11 are connected one by one, so that all batteries 11 are connected in series to form a large energy storage device.

[0024] To prevent the battery 11 from being unable to be fixed in the battery storage space 121, the battery 11 is bolted to the shell 111, and a plurality of threaded holes are provided on the shell 111, each threaded hole corresponding to each battery storage space 121. When the batteries 11 are placed in the battery storage space 121 in sequence and connected in series with each other through wires, the bolts pass through the shell 111, extend into the battery storage space 121, and are threadedly connected to the battery 11, thereby fixing the battery 11 in the battery storage space 121 to prevent the battery 11 from sliding, which would cause the wires between the batteries 11 to be disconnected, making the passage unable to work normally and supply power to the water pump.

[0025] The battery 11 may be a lead-acid battery, an alkaline nickel battery or a nickel-iron battery. As a preferred embodiment, the battery 11 is a vanadium battery. Vanadium batteries are green and environmentally friendly, can be discharged at a deep and high density, can be charged quickly, have a high specific energy, are inexpensive, and can ensure the stability of charging and discharging.

Claims

1. A photovoltaic water pump power supply system, Features: The invention comprises a solar photovoltaic panel, an energy storage device, a water pump, a step-down transformer, a first inverter, a second inverter and a step-up transformer, wherein the output end of the solar photovoltaic panel is connected to the input end of the first inverter, and the output end of the first inverter is connected to the water pump; the output end of the solar photovoltaic panel is also connected to the input end of the step-down transformer, the output end of the step-down transformer is connected to the input end of the second inverter, the output end of the second inverter is connected to the input end of the energy storage device, the output end of the energy storage device is connected to the input end of the step-up transformer, and the output end of the step-up transformer is connected to the water pump; the energy storage device comprises a storage battery (11), a charging controller and a discharging controller, the charging controller is electrically connected to the output end of the storage battery (11), the discharging controller is electrically connected to the output end of the storage battery (11), and the discharging controller is also connected to a light sensor.

2. A photovoltaic water pump power supply system as claimed in claim 1, Features: The storage battery (11) is provided with a power sensor, and the power sensor is electrically connected to a charging controller and a discharging controller.

3. A photovoltaic water pump power supply system as claimed in claim 1, Features: The invention also comprises a battery cooling device, the battery cooling device comprising a shell (111), the shell (111) covering the outside of the storage battery (11), a cover shell (12) being provided outside the shell (111), a gap for circulating cooling liquid being provided between the cover shell (12) and the shell (111), and a water inlet (13) and a water outlet (14) for the cooling liquid to enter and exit being provided on the cover shell (12).

4. A photovoltaic water pump power supply system as claimed in claim 3, Features: The top of the housing (12) is provided with a water inlet (13), the bottom of the housing (12) is provided with a water outlet (14) and a gravity sensor, the water outlet (14) is provided with a valve (141), and the valve (141) is electrically connected to the gravity sensor.

5. A photovoltaic water pump power supply system as claimed in claim 4, Features: The water inlet (13) is provided with a pump body (131), and the pump body (131) is connected to the output end of the energy storage device.

6. A photovoltaic water pump power supply system as claimed in claim 3, Features: At least two battery storage spaces (121) are provided in the housing (111), and the storage batteries (11) are arranged in the battery storage spaces (121) and are connected in series one by one.

7. A photovoltaic water pump power supply system as claimed in claim 6, Features: The storage battery (11) is bolted to the housing (111).

8. A photovoltaic water pump power supply system as claimed in claim 1, Features: The storage battery (11) is a vanadium battery.

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