China ’s per capita water shortage, frequent droughts, serious soil erosion, and the inability of the power grid to cover remote mountainous areas have severely affected people ’s lives, drinking water, and agricultural production. In recent years, China's photovoltaic industry has developed rapidly, costs have fallen year by year, and photovoltaic products have begun to enter people's lives. Among them, photovoltaic water pumping system is the combination of photovoltaic products and water pumping, innovative application to domestic water, agricultural irrigation, ecological restoration As a new application in the field of photovoltaics, the photovoltaic water pumping system can not only avoid a large amount of capital investment in power grid infrastructure construction, but also solve the problem of power shortage and water shortage in agricultural production.

A typical photovoltaic water pumping system is mainly composed of photovoltaic modules, photovoltaic brackets, water pumping inverters, water pumps and other four parts. It uses clean energy solar energy as the power to directly drive the water pump to pump water. Greatly reduce the construction cost and maintenance cost of the system. The system is widely used by people because of its environmental protection, energy saving, easy installation and maintenance, and good economy.

The design of photovoltaic water pumping system first needs to do a preliminary customer demand survey, such as: system usage, customer daily water consumption, head and local lighting and other information. Only by fully understanding the customer's specific needs can we provide customers with the best solution , To maximize customer satisfaction. The design of photovoltaic water pumping system mainly includes three parts: pump selection, pump inverter selection and photovoltaic module design.

1. Pump selection

1.1 Flow determination

The flow rate of the pump is also known as the water delivery volume. The flow rate of the system is mainly determined according to the customer's water consumption and local lighting conditions. Specifically, the design can refer to the following formula:

1.2 Head determination

The lift refers to the height at which the pump can lift water, and is an important performance parameter of the pump, which can be measured according to the actual conditions of the customer's project. The following is the calculation method of the head:

Pump head = static head + horizontal conveying distance + lost head

The static head refers to the height difference between the suction point of the pump and the high control point, such as pumping water from a deep water well and sending it to a high tank. The static head refers to the height difference between the suction port of the clear water tank and the high-level water tank; as shown in the figure, the static head is H1 + H3;

The horizontal transportation distance is shown in Figure H2. Generally, when calculating the head, every 10m in the horizontal direction is counted as 1m head;

The loss head is usually 6-9% of the net head, such as water pipe elbow, water head, etc., generally 1 ~ 2m.

After the flow and head of the pump are determined, the pump type can be basically determined. If the customer is pumping in a deep well, the size of the pump needs to be considered to be smaller than the diameter of the deep well.

2. Selection of pump inverter

Photovoltaic water pumping inverter is the most important equipment in photovoltaic water pumping system. As the control and regulator of the whole system, it always tracks the maximum power point and adjusts the output frequency in real time according to the change of sunshine, so as to control and regulate the pump work. The power of the water pump inverter is mainly determined by the pump motor. For the reliable operation of the system, it is generally recommended to select a power not less than the pump motor, taking into account the input voltage of the pump and the wiring method (single-phase or three-phase), and finally determine the water pump reverse The model of the transformer.

3. Photovoltaic module design

In remote mountainous areas, there is no power grid or diesel generator as a supplementary power supply. The power of the photovoltaic water pumping system is entirely provided by the electricity generated by the photovoltaic modules. In order to ensure that the customer ’s water demand is met, considering the tilt angle of the photovoltaic panel, temperature, and shadow blocking, The influence of dust and other factors on the system, as well as the over-capacity of the water inverter, it is generally recommended that the power of the photovoltaic module is between 1.1 and 1.5 times the rated power of the inverter, generally 1.2 times.

4. Typical design scheme of 5.5kW lifting system

Background of the project:

There is no city power and generator on the project site. A photovoltaic water pumping system is designed for a customer to pump water from deep wells for farmland irrigation. The specific information is as follows;

a) The depth of the well is about 60 meters, the head is about 50 meters, and the diameter is about 250mm;

b) A total of 80 mu of dry land needs to be irrigated, and about 70 cubic meters of water are used every day;

c) The average local sunshine time of the irrigation device is about 4 hours / day

4.1 Pump selection

According to the above information, the pump flow requirement is 70m3 / (4h * 0.85) = 20.6m3 / h, the head is 50 meters, the pump can choose Ruirong R150-DS-05, the motor power is 4kW, the applicable well diameter is 150mm, can fulfil requirements. The following are the specific parameters of the pump:

4.2 Selection of lifting inverter

According to the water pump motor power is 4kW, the input voltage is three-phase 380Vac, the water pump inverter selects SPRING5500 of Jingfuyuan, and the output rated power is 5.5kW.

4.3 PV module design

The selected pumping inverter SPRING5500 has a rated output of 5500W. Considering that the local lighting conditions are better, a 1.1-fold component can be selected, that is, 1.1 × 5500 = 6050W.

Founded in 2003, Shenzhen Jingfuyuan Technology Co., Ltd. is a national high-tech enterprise integrating R & D, production, sales and service. The company has been focusing on the power electronics industry for a long time. It has 0.55-75kW photovoltaic lifting inverters, single and three-phase AC outputs, supports a variety of pump motors, and has an IP65 protection level (22kW or more for outdoor cabinets, protection level is IP54) Outdoor use, and can be equipped with diesel engine or commercial power as a backup power supply, supporting 24 hours all-weather power generation. Jingfuyuan always adheres to the concept of "Tian Dao Qin Qin, excellence", and strives to create greater value for customers.

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