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Photovoltaic water pump system and control method for water-saving and energy-optimized irrigation

A photovoltaic water pump and energy optimization technology, which is applied in the direction of pump control, liquid variable capacity machinery, machine/engine, etc., can solve the problems that the maximum benefit cannot be obtained, and the solar photovoltaic water pump system cannot reasonably generate electric energy for pumping water, etc.

Active Publication Date: 2019-04-12
NINGBO RUIXIN ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing photovoltaic water pumping system is not combined with weather change information, so that the solar photovoltaic water pumping system cannot make a reasonable decision to use electric energy for pumping water or injecting it into the grid, and cannot obtain maximum benefits.

Method used

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  • Photovoltaic water pump system and control method for water-saving and energy-optimized irrigation
  • Photovoltaic water pump system and control method for water-saving and energy-optimized irrigation
  • Photovoltaic water pump system and control method for water-saving and energy-optimized irrigation

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Experimental program
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Embodiment 1

[0026] Embodiment 1: This embodiment realizes the photovoltaic water pump system for water-saving and energy-optimized irrigation, including an inverter 1 integrating variable frequency output and fixed frequency output. The inverter includes MPPT-DC / DC converter 101, and The DC bus 102 connected to the MPPT-DC / DC converter, the variable frequency DC / AC inverter 103 and the fixed frequency DC / AC inverter 104 connected to the DC bus, and the electric energy generated by the solar panel 2 is input into the inverter 1 ;

[0027] It also includes a water pump 3 driven by a variable frequency DC / AC inverter;

[0028] Also includes the main microcontroller 4 controlling the inverter;

[0029] Also includes a decision controller 5, the decision controller sends decision information to the main microcontroller;

[0030] It also includes a first power sensor 6 for detecting the output power of the fixed-frequency DC / AC inverter and a water level sensor 7 for detecting the depth of th...

Embodiment 2

[0033] Embodiment 2. This embodiment realizes the control method of the photovoltaic water pump system for water-saving and energy-optimized irrigation, including the following steps:

[0034] 1) Collect the water pump power data and the corresponding water output through the second power sensor, construct the power-water flow characteristic curve by using the water pump input power and pumping data, and determine the working power and working time of the water pump; the power-water flow characteristic curve of the pumping system can be Computed by mathematical equations (e.g. considering similar laws for motor efficiency at different input powers) or can be estimated by preliminary pump tests; a typical representation of water flow, water output and pump input power is given by the following third order polynomial: Among them: Q is water flow, H is water output, P in is the input power of the pump, c1, c2, c3 and c4 are the experimental coefficients;

[0035] 2) The decisio...

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Abstract

The invention discloses a photovoltaic water pump system for realizing water-saved and energy-optimized irrigation and a control method thereof. The photovoltaic water pump system comprises an inverter, a water pump, a main microcontroller, a decision controller, a water level sensor, a soil humidity sensor, a Wi-Fi emitter and the like. The control method comprises the following steps that (1) a power-water current characteristic curve of the water pump system is established according to a water outlet quantity and the input power of the water pump; (2) the decision controller makes the decision whether irrigation is conducted or not according to soil humidity information and weather forecast information; and (3) the main microcontroller controls the inverter to drive the water pump to extract water or merge photovoltaic electric energy into a power grid according to decision information of the decision controller. The photovoltaic water pump system for realizing water-saved and energy-optimized irrigation and the control method thereof fully consider the water storage quantity of a well, the soil humidity and the weather forecast rainfall information, can realize matching between water supply and crop water demands, realizes high-efficiency optimal utilization of photovoltaic energy, and can achieve maximum environmental benefits and economic benefits.

Description

technical field [0001] The invention relates to the technical field of photovoltaic water pump irrigation, in particular to a photovoltaic water pump system and a control method thereof for water-saving and energy-optimized irrigation. Background technique [0002] In order to ensure the match between crop water demand and water supply, photovoltaic pump irrigation systems are usually designed with the worst month in the crop water demand and solar light cycle. Therefore, the system can be used for most of the irrigation season despite variable water requirements and solar exposure. [0003] In irrigation with conventional photovoltaic pumping systems, the matching between water demand and supply is detected by soil moisture sensors. However, the existing photovoltaic water pumping system is not combined with weather change information, so that the solar photovoltaic water pumping system cannot reasonably make a decision to use electric energy for pumping water or injecting...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04B49/06
CPCF04B49/06
Inventor 严晋跃皮特坎帕纳张阳王磊
Owner NINGBO RUIXIN ENERGY TECH