Application of frequency converter in solar water pump field
Global environmental pollution and energy shortages have forced people to work harder to find and develop new energy sources. In this search and development, people naturally turn their attention to various renewable alternative energy sources, including wind power, nuclear power, hydropower, solar power, and photovoltaic power generation. Although the practical application of photovoltaic power generation has various limitations, with the reduction of photovoltaic power generation costs, the increase in the cost of mineral power generation, and the reduction of mineral energy, photovoltaic power generation is gradually entering the commercial stage.
1. The Basic Principles of Photovoltaic Power Generation: Solar cells are primarily made of single-crystal silicon. This single-crystal silicon is used to create a p-n junction similar to the one in a diode, and its operating principle is similar to that of a diode. However, in a diode, the movement of holes and electrons at the p-n junction is driven by an external electric field, while in a solar cell, the movement of holes and electrons at the p-n junction is driven and influenced by solar photons and radiant heat (*). This is commonly known as the photovoltaic effect. Currently, the efficiency of photoelectric conversion, or photovoltaic cells, is approximately 13%-15% for single-crystal silicon and 11%-13% for polycrystalline silicon. The latest technology also includes thin-film photovoltaic cells.
2. Classification of Solar Photovoltaic Power Generation Systems: Currently, solar photovoltaic power generation systems can be broadly divided into three categories: off-grid photovoltaic power storage systems, grid-connected photovoltaic power generation systems, and hybrid systems of the first two. Off-grid photovoltaic power storage systems are a common solar energy application and have been used both domestically and internationally for several years. They are relatively simple and widely adaptable. However, their use is limited by the large size and maintenance difficulties of their various types of storage batteries.
3. Components of a Solar Photovoltaic System
● Solar photovoltaic cells (solar substrates): perform photoelectric conversion.
● Battery: Batteries are key components in photovoltaic power generation systems, storing electricity converted from photovoltaic cells. Currently, my country does not have dedicated batteries for photovoltaic systems; conventional lead-acid batteries are used instead.
● DC inverter: Its function is to convert DC to AC power, so the most important performance indicators for this component are reliability and conversion efficiency. The AC power converted by the AC inverter maximizes the amount of energy converted from the photovoltaic cells and feeds it into the grid or directly to power-consuming devices.
4. A photovoltaic water pump system is a typical integrated optical, mechanical, and electrical system. It uses solar cells to directly convert solar energy into electricity, which is then converted to AC power through an inverter. This power drives an AC asynchronous motor that pumps water from deep wells, rivers, lakes, ponds, and other water sources. This system is widely used in desertification control, residential life, agricultural irrigation, landscaping irrigation, grassland animal husbandry, scenic fountains, and water treatment projects. The photovoltaic water pump system has the following features:
● The photovoltaic water pump system operates fully automatically, requiring no human intervention. The system consists of photovoltaic cells (solar substrates), batteries (customized), a dedicated photovoltaic inverter, a water pump, and a water storage device.
● A dedicated inverter for photovoltaic water pumps adjusts pump speed based on changes in sunlight intensity, ensuring output power approaches the maximum power of the solar array. When sunlight is abundant, the pump speed remains within the rated speed. When sunlight is insufficient, the pump automatically stops if the set minimum operating frequency is met.
● The pump, driven by a three-phase AC motor, draws water from a deep well and injects it into a water storage tank/pond or connects directly to the irrigation system. Different types of pumps can be used depending on actual system requirements and installation conditions.
● We can provide cost-effective solutions tailored to specific regional and customer needs.
Photovoltaic water pump systems utilize the sun's enduring energy, operating from sunrise to sunset. They require no human supervision, no fossil fuels, operate independently, and can be integrated with the power grid as needed. They are safe and reliable. Without requiring any external energy, they can be flexibly applied to farmland irrigation, drinking water for humans and livestock, garden development, park beautification, the construction of colorful fountains, aeration for aquaculture, and water supply and drainage for coastal salt pans. They effectively address farmland irrigation issues, increase yields, conserve water and energy, and significantly reduce traditional energy and electricity inputs. They offer advantages such as long life, low power consumption, low noise, balanced speed regulation, stable operation, and interference-free operation. Therefore, photovoltaic water pump systems have become the most effective way to replace fossil fuels with clean energy and a key new energy and technology product in comprehensive solutions to global food and energy challenges.
