Solar photovoltaic intelligent water lifting system

Abstract

The utility model provides a solar photovoltaic intelligent water lifting system which effectively solves the problems that an existing solar photovoltaic water lifting system cannot detect that under the condition that the continuous illumination intensity is poor in advance, the power generation amount of a solar photovoltaic panel is reduced, a water pump is possibly forced to stop, and the water supply stability is affected. The system further comprises a power supply monitoring module, the power supply monitoring module comprises a plurality of sub-monitoring modules, and the sub-monitoring modules are in one-to-one correspondence with the water pumps. The power supply monitoring module detects the illumination intensity in the environment and the discharge current of the storage battery to obtain an illumination intensity signal and a discharge current signal, and obtains a reminding signal and an early warning signal based on the illumination intensity signal and the discharge current signal. The reminding signal is input to a storage battery, and the early warning signal is input to a control center; the power supply monitoring module comprises an environment detection unit and an electric quantity detection unit.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic power supply technology, and in particular to a solar photovoltaic intelligent water lifting system. Background Technology

[0002] The solar photovoltaic water lifting system consists of photovoltaic cells, a controller, and a photovoltaic water pump. The photovoltaic cells directly convert solar radiation into electrical energy. The controller converts direct current (DC) to alternating current (AC) for frequency conversion control and maximum power point tracking of the water pump. The photovoltaic water pump is a multi-stage centrifugal pump with a wide and efficient operating range, equipped with a dedicated solar-powered motor. This technology can play a significant role in combating wildfires. For example, the intelligent fire prevention, extinguishing, and insect control system for forests in areas without signal or electricity, as provided in Chinese utility model patent application number 202121601435.3, demonstrates significant effectiveness in its water lifting, storage, and sprinkler systems, all powered by a separate solar photovoltaic power generation system.

[0003] In actual operation, solar photovoltaic panels cannot continuously detect sunlight to generate electricity to power the water pumps in the secondary pumping station of the solar photovoltaic water lifting system. Therefore, a storage battery is installed to power the excess electricity generated by the solar photovoltaic panels. However, in situations with continuous low sunlight intensity, such as cloudy or rainy days, the reduced power generation of the solar photovoltaic panels may force the water pumps to shut down. If the storage battery is also insufficient at this time, and this phenomenon cannot be detected in advance, it will affect the stability of the water supply and also hinder firefighting operations on the mountain.

[0004] In other words, existing solar photovoltaic water pumping systems cannot detect in advance that a decrease in the power generation of solar photovoltaic panels under continuous poor light intensity may force the water pump to shut down, affecting the stability of water supply.

[0005] Therefore, this utility model provides a new solution to this problem. Summary of the Invention

[0006] In view of the shortcomings of existing technologies, the purpose of this utility model is to provide a solar photovoltaic intelligent water lifting system, which effectively solves the problem that existing solar photovoltaic water lifting systems cannot detect in advance that the reduced power generation of solar photovoltaic panels may force the water pump to stop under continuous poor light intensity, thus affecting the stability of water supply.

[0007] The technical solution is a solar photovoltaic intelligent water lifting system, which includes a secondary pumping station with multiple water pumps, each powered by a solar photovoltaic panel and a battery, the battery being charged by the solar photovoltaic panel. The system also includes a power supply monitoring module, which includes multiple sub-monitoring modules, each corresponding to one of the water pumps.

[0008] The power supply monitoring module detects the ambient light intensity and the battery discharge current to obtain light intensity signals and discharge current signals, and obtains reminder signals and warning signals based on the light intensity signals and discharge current signals, and inputs the reminder signals to the battery and the warning signals to the control center;

[0009] The power supply monitoring module includes an environmental detection unit and a power detection unit;

[0010] The power detection unit is connected to the environmental detection unit, the battery, and the control center, respectively.

[0011] Furthermore, the environmental detection unit obtains a start signal based on the light intensity signal, and starts the power detection unit based on the start signal.

[0012] Furthermore, the environmental detection unit obtains a light intensity comparison signal based on the light intensity signal, and obtains a start signal based on the light intensity comparison signal.

[0013] Furthermore, the environmental detection unit generates a high level based on the illumination comparison signal, and multiplies the high level with the high level of the previous moment to obtain a start signal.

[0014] Furthermore, the power detection unit integrates the discharge current signal to obtain a power signal, and obtains the warning signal and reminder signal based on the power signal.

[0015] Furthermore, the power detection unit determines the voltage based on the power signal to obtain a reminder signal.

[0016] Furthermore, the power detection unit also activates an oscillator based on the power signal, and the oscillator generates the warning signal.

[0017] This utility model achieves the following beneficial effects:

[0018] This application addresses the issue of existing solar photovoltaic water lifting systems by incorporating a power supply monitoring module within the two-stage pump station. This module detects the ambient light intensity and the battery discharge current to obtain light intensity and discharge current signals, respectively. Based on these signals, it generates alert and warning signals, which are then input to the battery and the warning signal to the control center. This effectively solves the problem that existing solar photovoltaic water lifting systems cannot detect in advance the reduced power generation of solar photovoltaic panels under continuous low light intensity, which could force the water pumps to shut down and affect water supply stability. This provides the control center with a buffer time, ensuring the stability of the solar photovoltaic water lifting system's water supply and guaranteeing the effectiveness of firefighting on the mountain. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall framework of this utility model.

[0020] Figure 2 This is a schematic diagram of the framework of the sub-monitoring module of this utility model.

[0021] Figure 3 This is a circuit diagram of the sub-monitoring module of this utility model. Detailed Implementation

[0022] For the purposes of this utility model, the foregoing and other technical contents, features and effects are described in conjunction with the appendix below. Figure 1-3 The detailed description of the embodiments will make this clear. All structural details mentioned in the following embodiments are based on the accompanying drawings.

[0023] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings.

[0024] A solar photovoltaic intelligent water lifting system includes a secondary pumping station with multiple water pumps, each powered by a solar photovoltaic panel and a battery, the battery being charged by the solar photovoltaic panel. The system also includes a power supply monitoring module with multiple sub-monitoring modules, each sub-monitoring module corresponding to one of the water pumps.

[0025] The sub-monitoring module detects the ambient light intensity and the battery discharge current to obtain light intensity signals and discharge current signals, and obtains reminder signals and warning signals based on the light intensity signals and discharge current signals, and inputs the reminder signals to the battery and the warning signals to the control center;

[0026] The sub-monitoring module includes an environmental detection unit and a power detection unit;

[0027] The power detection unit is connected to the environmental detection unit, the battery, and the control center, respectively.

[0028] The power supply monitoring module uses a photodetector composed of a photoresistor R11 and a resistor R2 to detect the light intensity in the environment where the solar photovoltaic panel is located, obtaining a light intensity signal. This signal is then output to the operational amplifier U3A via resistor R5 and compared with the rated lower light limit signal provided by resistor R7 to obtain a light intensity comparison signal. If the light intensity comparison signal turns on diode D2, it indicates that the light intensity in the environment where the solar photovoltaic panel is located is still relatively strong, requiring no further processing. In this case, diode D2 discharges the light intensity comparison signal to ground via resistor R3 and capacitor C2. Conversely, if the light intensity comparison signal turns on transistor Q5, it indicates that the light intensity in the environment where the solar photovoltaic panel is located is relatively weak, and the environment is cloudy. In situations where there is insufficient sunlight, the solar photovoltaic panel cannot generate enough voltage to drive the water pump. In this case, transistor Q5 outputs a high level through resistor R1, and this high level is split into two paths. One path is output to pin 1 of multiplier V1, and the other path is delayed by a timer composed of resistor R16 and capacitor C7 before being output to pin 2 of multiplier V1. That is, pin 2 of multiplier V1 stores the high level of the previous moment. Multiplier V1 multiplies the high level of this moment with the high level of the previous moment, thereby outputting a start signal. The start signal turns on relay K1, indicating that the solar photovoltaic panel cannot detect enough sunlight and cannot drive the water pump. Then, pin switch S1 of relay K1 turns on, and the power detection unit turns on.

[0029] The environmental detection unit includes a photoresistor R11. One end of the photoresistor R11 is connected to one end of resistor R2 and one end of resistor R5. The other end of resistor R2 is connected to one end of resistor R7, one end of resistor R17, and the emitter of transistor Q5, and is connected to the positive power supply VCC. The other end of resistor R5 is connected to the non-inverting input of operational amplifier U3A. The inverting input of operational amplifier U3A is connected to the other end of resistor R7. The output of operational amplifier U3A is connected to the anode of diode D2, the base of transistor Q5, and the other end of resistor R17. The negative terminal is connected to one end of resistor R3, and the other end of resistor R3 is connected to one end of capacitor C2. The collector of transistor Q5 is connected to one end of resistor R13 and one end of resistor R1. The other end of resistor R1 is connected to one end of resistor R16 and pin 1 of multiplier V1. The other end of resistor R16 is connected to one end of capacitor C7 and pin 2 of multiplier V1. The output of multiplier V1 is connected to one end of relay K1. The other end of relay K1 is connected to the other end of capacitor C2, the other end of capacitor C7, and the other end of photoresistor R11 and then connected to ground.

[0030] After the power detection unit is turned on, the current sensor U1 detects the discharge current of the battery to obtain a discharge current signal. The current sensor U1 uses a Hall current sensor, such as the EHKC-EKBA. The detected discharge current signal is output to an integrator centered around resistor R9, capacitor C3, and operational amplifier U2A. The integrator integrates the discharge current signal to obtain a power signal, which is then processed by transistors Q2 and Q1. If transistor Q2 is turned on by the power signal, it indicates that the power supply has sufficient charge, and transistor Q2 outputs a reminder signal. The battery signal indicates that the water pump needs power. If the power signal turns on transistor Q1, it means that the battery is not providing enough power to the water pump. In this case, transistor Q1 will output to relay K1, which will then switch switch S2 from open to closed. At this point, the oscillator, which consists of transistor Q3, capacitor C3, inductor L1, and capacitor C2, will start running and generate a warning signal. This warning signal will be sent to the control center to alert the staff that the water pumps in the secondary pumping station will stop due to lack of power and require immediate action.

[0031] The power detection unit includes a resistor R9. One end of resistor R9 is connected to the out pin of current sensor U1. The vcc pin of current sensor U1 is connected to one end of switch S1. The other end of switch S1 is connected to one end of resistor R8, the emitter of transistor Q1, one end of resistor R18, one end of switch S2, one end of resistor R17 in the environmental detection unit, and the emitter of transistor Q5, and is connected to the positive power supply VCC. The other end of resistor R9 is connected to one end of resistor R4, one end of capacitor C5, and the inverting input of operational amplifier U2A. The output of operational amplifier U2A is connected to the other end of resistor R4, the other end of capacitor C5, one end of resistor R15, the base of transistor Q2, the other end of resistor R8, and the base of transistor Q1. The other end of resistor R18 is connected to the collector of transistor Q2 and the anode of diode D3. The cathode of diode D3 is connected to the battery. The emitter of transistor Q1 is connected to one end of resistor R14 and one end of relay K2. The other end of switch S2 is connected to one end of resistor R12, one end of capacitor C3, and one end of inductor L1. The other end of resistor R12 is connected to the base of transistor Q3, one end of resistor R10, and one end of capacitor C1. The emitter of transistor Q3 is connected to the other end of capacitor C1 and one end of resistor R6. The collector of transistor Q3 is connected to the other end of capacitor C3, the other end of inductor L1, and one end of capacitor C6. The other end of capacitor C6 is connected to the control center. The other end of resistor R6 is connected to the other end of resistor R10, the other end of relay K2, the other end of resistor R14, the emitter of transistor Q2, the other end of resistor R15, the non-inverting input of op-amp U2A, the gnd pin of current sensor U1, and the other end of capacitor C2 in the environmental detection unit, and is connected to ground.

[0032] In actual use, if the light intensity signal detected by the environmental detection unit is 0.6V, while the rated lower limit light intensity signal is 1V, then the light intensity comparison signal will turn on transistor Q5. The high level output by transistor Q5 will be multiplied by multiplier V1 to obtain a start signal. The start signal will start the power detection unit. The power detection unit will then detect a battery discharge current signal of 1V. The power signal obtained by integrating through resistor R9, capacitor C5, and operational amplifier U2A will be 0.7V. This power signal will turn on transistor Q1, which will then turn on relay K2. Relay K2 will then close switch S2. At this time, the oscillator will output a warning signal and send it to the control center to alert the staff at the control center that the water pumps in the secondary pumping station are without power and need to be dealt with immediately.

[0033] In use, the system further includes a power supply monitoring module, which comprises multiple sub-monitoring modules, each corresponding to a water pump. Each sub-monitoring module includes an environmental detection unit and a power detection unit. The sub-monitoring module uses a photodetector composed of a photoresistor R11 and a resistor R2 to detect the light intensity in the environment where the solar photovoltaic panel is located, obtaining a light intensity signal. This signal is then output to the operational amplifier U3A via resistor R5 and compared with the rated lower limit light intensity signal provided by resistor R7 to obtain a light intensity comparison signal. If the light intensity comparison signal turns on transistor Q5, Q5 outputs a high level via resistor R1. This high level is then split into two paths: one path is output to pin 1 of multiplier V1, and the other path is delayed by a delay circuit composed of resistor R16 and capacitor C7 before being output to pin 2 of multiplier V1. Multiplier V1 multiplies this high level with the previous high level, thus outputting a start signal. This start signal turns on relay K1, activating the relay. When pin switch S1 of device K1 is turned on, the power detection unit is turned on. After the power detection unit is turned on, the current sensor U1 detects the discharge current of the battery to obtain a discharge current signal. The detected discharge current signal is output to an integrator with resistor R9, capacitor C3, and operational amplifier U2A as its core. The integrator integrates the discharge current signal to obtain a power signal, which is then judged by transistors Q2 and Q1. If transistor Q2 is turned on by the power signal, it indicates that the power supply device is currently... If the battery has sufficient power, transistor Q2 outputs a warning signal to the battery. If the power signal turns on transistor Q1, transistor Q1 outputs a signal to relay K1. Relay K1 then turns switch S2 from the open state to the closed state. At this time, the oscillator, which is composed of transistor Q3, capacitor C3, inductor L1, and capacitor C2, starts running and generates a warning signal. This warning signal is then output to the control center, alerting the control center staff that the water pumps in the secondary pumping station are without power and need to be dealt with immediately.

[0034] This utility model achieves the following beneficial effects:

[0035] (1) This application addresses the existing solar photovoltaic water lifting system by setting up a power supply monitoring module in the secondary pump station. The power supply monitoring module includes multiple sub-monitoring modules, each corresponding to a water pump. The sub-monitoring modules detect the ambient light intensity and the battery discharge current to obtain light intensity signals and discharge current signals, and obtain reminder signals and warning signals based on the light intensity signals and discharge current signals. The reminder signals are then input to the battery and the warning signals are input to the control center. This effectively solves the problem that the existing solar photovoltaic water lifting system cannot detect in advance that the power generation of the solar photovoltaic panels may be reduced under continuous poor light intensity, which may force the water pump to stop and affect the stability of water supply. This provides the control center with a certain buffer time, thereby ensuring the stability of water supply of the solar photovoltaic water lifting system and also ensuring the effectiveness of fire fighting on the mountain.

[0036] (2) The sub-monitoring module described in this application includes an environmental detection unit. The environmental detection unit detects the light intensity in the environment where the water pump in the secondary pumping station is located based on a light detector composed of resistor R2 and photoresistor R11 to obtain a light intensity signal. It then compares the light intensity signal based on operational amplifier U3A to obtain a light comparison signal. Finally, it judges the light comparison signal based on transistor Q5 and diode D2 to obtain a start signal. This enables the monitoring of the light intensity in the environment where the solar photovoltaic panel is located and achieves the initial power supply monitoring effect for the water pump.

[0037] (3) The sub-monitoring module described in this application includes a power detection unit. The power detection unit integrates the discharge current signal of the battery based on an integrator with resistor R9, capacitor C5 and operational amplifier U2A as the core to obtain the power signal. It judges the power signal based on transistors Q2 and Q5 to determine whether the battery power is sufficient to drive the water pump and outputs an early warning signal to the control center. This provides the control center with a certain buffer time and achieves the effect of early detection, avoiding the water pump from shutting down due to insufficient battery power and insufficient voltage provided by the solar photovoltaic panel. This provides an intelligent solar water lifting system.

Claims

1. A solar photovoltaic intelligent water pumping system, the system comprising a secondary pumping station, a plurality of water pumps being present in the secondary pumping station, and each water pump being powered by a solar photovoltaic panel and a storage battery, the storage battery being charged by the solar photovoltaic panel, characterized in that, The system further comprises a power supply monitoring module, wherein a plurality of sub-monitoring modules are included in the power supply monitoring module, and the sub-monitoring modules correspond to the water pumps one by one; The sub-monitoring modules respectively detect the light intensity in the environment and the discharge current of the battery to obtain a light intensity signal and a discharge current signal, and obtain a warning signal and a prompt signal based on the light intensity signal and the discharge current signal, and input the warning signal to the battery and the prompt signal to the control center; The sub-monitoring modules comprise an environment detection unit and a power detection unit; The power detection unit is respectively connected to the environment detection unit, the battery and the control center.

2. The solar photovoltaic smart water pumping system as claimed in claim 1, wherein, The environment detection unit obtains a start signal based on the light intensity signal, and starts the power detection unit based on the start signal.

3. The solar photovoltaic smart water pumping system as claimed in claim 2, wherein, The environment detection unit obtains a light comparison signal by comparing based on the light intensity signal, and obtains a start signal based on the light comparison signal.

4. The solar photovoltaic smart water pumping system as claimed in claim 3, wherein, The environment detection unit generates a high level based on the light comparison signal, and performs a multiplication operation on the high level and the high level at the previous time to obtain a start signal.

5. The solar photovoltaic smart water pumping system as claimed in claim 1 wherein, The power detection unit obtains a power signal by integrating based on the discharge current signal, and obtains the warning signal and the prompt signal based on the power signal.

6. The solar photovoltaic smart water pumping system as claimed in claim 5, wherein, The power detection unit obtains a prompt signal by voltage judgment based on the power signal.

7. The solar photovoltaic smart water pumping system as claimed in claim 5, wherein, The power detection unit further starts an oscillator based on the power signal, and the oscillator generates the warning signal.

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