Abstract: With the development of photovoltaic industry, the working efficiency of photovoltaic panels becomes better. The newly developed photovoltaic water pump scheme GD100-PV has been quietly listed and successfully applied around the world. This PV inverter learned experience from the previous generation of products and combined with feedback from end customers around the world to improve. This article will introduce the GD100-PV series photovoltaic water pump inverter.
Keywords: photovoltaic MPPT photovoltaic water pump
1. Scheme Background
After collecting feedback information from the solar market and end users, we get the following suggestions:
(1) Reduce the number of photovoltaic panels used
Because ordinary solar energy inverter needs high DC input voltage;
(2) Support single-phase water pump
For civil water pumps, many motors are single-phase, while many photovoltaic water pump inverters on the market do not support single-phase, only three-phase;
(3) Support AC/PV channel input
At night, if there is no energy input from PV, the water pump will stop working. However, some projects require the water pump to keep working all the time;
(4) Easy debugging
The previous generation of products need to modify some parameters to apply to different pumps, while the new inverter can automatically match the parameters to work;
(5) Support remote control
Users can use mobile applications or websites to monitor the running state of the machine and control the startup or shutdown of the system.
In order to meet the needs of end users and solve the drawbacks of photovoltaic water pump frequency converter in the market, new products have been developed to meet the above needs of customers.
2. Introduction to PV inverter
● It is applicable to single-phase or three-phase water pumps, with a wide range of applications;
● Built in MPPT controller, excellent MPPT algorithm is applicable to various solar panels;
● IP54 control cabinet solution, which can be applied to severe outdoor environment and can be directly installed outdoors;
● Support boost module less than 2.2KW, increase PV output voltage;
● Support PV input and AC grid input, and realize automatic switching without manual intervention;
● It has the function of water level control logic to avoid dry and water free operation and increase the function of full water level protection;
● Start slowly to reduce the voltage sharp pulse to the motor;
● Low startup voltage and wide input voltage range provide more possibilities for accepting multiple PV string configurations and different types of PV modules;
● Digital intelligent control can flexibly adjust and set the speed range of the water pump. In addition to the soft start function, it can also provide lightning protection, overvoltage, overcurrent, overload and other protection functions;
● Support GPRS module, people can operate the system through website platform or mobile phone application.
3. Introduction to PV
PV or photovoltaic is the abbreviation of solar photovoltaic power system. It is a new type of power generation system that uses the photovoltaic effect of solar cell semiconductor materials to directly convert solar radiation energy into electrical energy. There are two modes of independent operation and grid connected operation. At the same time, the classification of solar photovoltaic power generation system is centralized, such as large-scale northwest ground photovoltaic power generation system; One is distributed (with>6MW as the boundary), such as the roof photovoltaic power generation system of industrial and commercial enterprises and the roof photovoltaic power generation system of residential buildings.
4. Two solutions for photovoltaic water pump application
For water pumps with power less than 2.2KW, when we configure solar panels, the photovoltaic power is sufficient, but the photovoltaic output voltage is insufficient, so we need to buy more solar panels to increase the photovoltaic voltage. GD100-PV provides a boost module that supports low PV voltage input and high DC voltage output to reduce the number of photovoltaic panels used. The automatic switching module can detect the output voltage of the voltmeter and send the voltage signal to the GD100-PV converter, which will control the contactor to open or close the AC input.
5. Summary
● It integrates many functions, such as reducing photovoltaic input voltage, switching of DC power switch and AC power switch input channels, high protection level IP54, etc. After the first parameter setting of the solar inverter, the end user does not need to maintain.
● The light will become weak after sunset, and it can be detected that the PV voltage is less than the set value. He will automatically convert the power input channel from PV to AC power grid input. If only PV channel can input voltage, GD100-PV will sleep under weak light and wake up automatically in the morning.