A solar photovoltaic water pump control system and control method thereof
A solar photovoltaic and control system technology, applied in the field of solar energy, can solve the problems of wasting electric energy, system crashes, and the production capacity of photovoltaic water pump dedicated inverters is not large, and achieve the effect of reducing costs and increasing the scope of use
Active Publication Date: 2017-02-01
ANHUI SUN CREATE ELECTRONICS
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Problems solved by technology
[0002] The solar photovoltaic water pump system is mainly composed of solar photovoltaic modules, special inverters for photovoltaic water pumps, water pumps and accessories. Traditional general-purpose inverters cannot be used in solar photovoltaic water pump systems because the general-purpose inverters are rated at 220V, 50HZ AC input, 380V50HZ In the AC output system, the input terminal of the solar photovoltaic water pump system is solar direct current, and the output voltage of the solar photovoltaic module is constantly changing due to factors such as light intensity and temperature. Stable operation, the general-purpose inverter does not know what frequency should work under the corresponding DC voltage is optimal, if the input voltage decreases but the general-purpose inverter does not reduce the frequency to an appropriate value at the same time, then the system will crash, otherwise, if The input voltage rises but the general-purpose inverter does not increase the frequency to an appropriate value at the same time, then a part of electric energy is wasted, and it is not converted into AC power with maximum efficiency and output to the water pump, that is, the general-purpose inverter itself cannot match the input voltage and output frequency. Therefore, general-purpose inverters cannot be used alone in solar photovoltaic water pump systems
[0003] The special inverter for solar photovoltaic water pump is a newly launched inverter specially used in the solar photovoltaic water pump system, but the current price of the special inverter for photovoltaic water pump is very expensive, which is several times that of the general inverter. The reason is that the solar photovoltaic water pump The system is not widely used at present, and the annual production volume of inverters for photovoltaic water pumps is not large, far from reaching the production volume of general-purpose inverters, so the price is several times more expensive than general-purpose inverters.
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[0022] A solar photovoltaic water pump control system, comprising a solar photovoltaic assembly 10, the output end of which supplies power to a controller 40 and a general frequency converter 30 through a combiner box 20, the general frequency converter 30 and the controller 40 communicate in two directions, and the general frequency converter 30 The output end of the water pump 50 is connected with the control end of the water pump 50, the water outlet of the water pump 50 is communicated with the water source through the water pipe, the controller 40 includes a water level sensor, and the water level sensor is installed in the water source, such as figure 1 shown.
[0023] like figure 2As shown, the controller 40 consists of a voltage AD sampling circuit 42 for collecting voltage signals of solar photovoltaic modules, a current AD sampling circuit 43 for collecting current signals of solar photovoltaic modules, a power AD sampling circuit 44, a reference voltage circuit, an...
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The invention relates to a solar-energy photovoltaic water pump control system which comprises a solar-energy photovoltaic assembly, the output end of which supplies power to a controller and a general frequency converter through a convergence box. The general frequency converter and the controller are in double-direction communication; the output end of the general frequency converter is connected with the control end of a water pump; the water outlet of the water pump is communicated with a water source through a water pipe; the controller comprises a water level sensor; and the water level sensor is arranged in a water source. The invention also discloses a control method of the solar-energy photovoltaic water pump control system. Through carrying out AD sampling on voltage, current and power of the solar-energy photovoltaic assembly, operation frequency of the general frequency converter corresponding to the maximum power point can be calculated through the controller in real time; and the operation frequency is transmitted to the general frequency converter through a 485 communication circuit, so that the general frequency converter is allowed to be applied to the solar-energy photovoltaic water pump system, the cost is reduced, and the using range of the general frequency converter is improved.
Description
technical field [0001] The invention relates to the technical field of solar energy, in particular to a solar photovoltaic water pump control system and a control method thereof. Background technique [0002] The solar photovoltaic water pump system is mainly composed of solar photovoltaic modules, special inverter for photovoltaic water pump, water pump and accessories. The traditional general inverter cannot be used in the solar photovoltaic water pump system, because the general inverter is rated to work at 220V, 50HZ AC input, 380V50HZ In the AC output system, the input end of the solar photovoltaic water pump system is solar direct current, and the output voltage of the solar photovoltaic module is constantly changing due to the influence of light intensity, temperature and other factors. Stable operation, the general-purpose inverter does not know what frequency is optimal under the corresponding DC voltage. If the input voltage decreases but the general-purpose invert...
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IPC IPC(8): H02S40/30F04B49/06
CPCF04B49/06H02S40/00Y02A20/00Y02E10/50
Inventor 郭春禹何必荣林军许亮
Owner ANHUI SUN CREATE ELECTRONICS