Let’s take Yunnan, China as an example to describe the development and application of photovoltaic water pumps:
Since 2008, climatic anomalies Yunnan has suffered an unprecedented drought for many years, which has brought a great impact on the life and industrial and agricultural production of people of all ethnic groups in the province. In order to ensure the safety of drinking water for people and animals in arid areas, local governments have invested heavily, using a large number of fire trucks, tractors, animal-drawn vehicles and other means of transportation to pull and deliver water to people in arid and dry areas. The drought season is the time when the solar thermal resources are the most abundant. As long as the water sources of the big rivers, rivers and lakes are not dry, the solar photovoltaic water pump can be used to provide water supply nearby to solve the urgent need. Professor Liu Zuming from the Institute of Solar Energy of Yunnan Normal University and the technical team of Yunnan Zhuoye Energy Company led by him, actively organized the forces at the critical timing of the drought and water shortage in the dry and hot valleys of Yunnan. In a short period of time, it took the lead in developing dynamic maximum power tracking, intelligent control to track the change of sunlight radiation intensity, automatic and flexible start and stop, and the power load of the pump system can be adjusted in time when the sunlight changes, without sudden shutdown, avoiding the water hammer effect, extending the The service life of pumps and pipelines has been improved; and in view of the high water lifting height in the mountainous area of Yunnan, which often requires multi-stage pumping stations to lift water, the multi-pump control technology has been successfully developed. According to the intensity of sunlight, the single-pump or dual-pump can be switched in real time. The variable frequency operation of the pump greatly reduces the requirements for the solar radiation intensity when the pump is started, makes full use of the solar radiation energy in the case of weak light irradiation, and effectively utilizes the solar energy when the light intensity is high, reducing the waste of a pump with high lift. , a series of patented new technologies and the efficiency of their products that significantly improve the overall efficiency of the photovoltaic water pump system.
Yunnan Zhuoye Energy Co., Ltd. and Yunnan Normal University Solar Energy Institute used the above-mentioned new technology products, with the financial support of Dali Prefecture Immigration Bureau and Science and Technology Bureau, on January 20, 2013 at the resettlement site in Hekou, Jijie Township, Yangbi County, Dali Prefecture Completed the first solar photovoltaic water pump system in Yunnan Province to lift water from the Yangbi River—currently the Xiaowan Power Station’s reservoir, with a total lift of nearly 300m. The project uses a two-stage water-lifting mode, using a 5.5kW pump as the first-stage water lifter, using a 22kW special high-lift pump to lift the water from the filter pool to the 240m-lift mountain top pool, equipped with a 36.96kW photovoltaic power generation system to drive the two A water pump is used for the irrigation of cash crops in immigrant villages, ending the history of villagers living by the riverside “water flows down the river, and people worry on the mountains”. Hekou resettlement site is a resettlement village built by Xiaowan Power Station. There are currently 26 villagers. After resettlement, they have received strong support from the state science and technology bureau and other governments at all levels to develop economic crops such as loquat, red grape and Sydney, and carry out economic transformation. Income has been greatly increased, but due to the continuous drought in Yunnan in the past three years, the irrigation of crops has encountered great difficulties in the dry season. After the completion of the project, the water extraction volume on a sunny day exceeds 80m3; the annual average water extraction volume exceeds 15,000m3, It has played a huge role in promoting the economic development of the village.
On June 6, 2013, the consortium of Panzhihua Yinjiang Jinyong Industry and Trade Co., Ltd. and Yunnan Zhuoye Energy Co., Ltd. adopted the photovoltaic water pump control inverter ( The powers of the inverters are 11kW, 75kW×2) and related new technologies respectively. The solar photovoltaic water-lifting project with the highest lift and the largest scale has been built on the Jinsha River for Yishala Village, Pingdi Town, Renhe District, Panzhihua City, Sichuan Province. equipment installation. The net lift of the project is 887m, the pump power is 117.5kW, the photovoltaic module power is 164.64kW, and the water lift exceeds 220m3 on a sunny day. The completion of the project once again provided a good application example for the solution of water supply problems in similar regions in China.
Recently, Yunnan Zhuoye Energy Co., Ltd. has built the largest photovoltaic water pump system in Yunnan and the world’s largest in Wayao Town, Longyang District, Baoshan City, Yunnan Province. The water-lifting height difference of the system is 580m, the distance between the main water pipes is 3500m, the water-lifting capacity is 130m3 on sunny days, and the photovoltaic array power is 94kW; the single power of the two high-pressure plunger pumps is 37kW; the system is equipped with ZYPD-45× 2 Double-pump photovoltaic water pump control inverter: This type of controller has automatic start, stop, water dry, water full protection; dynamic maximum power tracking, multi-pump control, optical-to-parallel and telemetry, remote control functions. The system also realizes the remote wireless water level control technology, which is at the international leading level in the overall technology. After the system was put into operation, it solved the perennial drinking water problem for more than 1,200 people and nearly 1,000 large livestock in seven villager groups in Papaya Village, Wayao Town.
Yunnan Jingneng Technology Co., Ltd. is also a high-tech enterprise specializing in the development, research and production of solar photovoltaic application technology in Yunnan. The company has made outstanding achievements in the development and construction of photovoltaic water pump new technology, photovoltaic intelligent control system, wind-solar hybrid intelligent control system, inverter control integrated machine system, and photovoltaic off-grid or distributed grid-connected power station technology development and construction. In recent years, Yunnan Jingneng has undertaken the design and construction tasks of five off-grid power plants in Qamdo, Tibet, with a total installed capacity of 135kW, in the “Bright Project” in western China, with a national investment of 4 billion. It has also built a number of photovoltaic distributed grid-connected power stations in Southeast Asia and Sichuan and Yunnan regions, with a total installed capacity of 25.6MW: only in the practical application of photovoltaic water pumps, within two years in Zhaoyang District, Zhaotong City, Wenshan Guangnan, Chuxiong Lufeng , Qujing Fuyuan, Lijiang Yongsheng, Panzhihua in Sichuan Province and Thailand built nine new photovoltaic water pumping systems, and achieved a series of well-known successful examples.
Photovoltaic water pumps use solar energy—clean energy to solve the power supply problem of pumping stations. There is no electricity bill after one investment, and the water pump system runs automatically, without manual intervention under normal circumstances, reducing operating costs, saving energy and reducing emissions, and protecting the environment. and the multiple purposes of sustainable development. If it is estimated as a new project, the cost of erecting the power grid and substation, plus the electricity cost of several years, the cost of the same project far exceeds the total investment of the photovoltaic water pump; especially in the case of a long distance from the power grid, the conventional AC water pump The construction cost of the system is much higher than that of the photovoltaic water pump system. The photovoltaic system requires little maintenance during its 25+ years of use, and a long-term benefit from a single investment.
Photovoltaic water pumps have a good match with the effective use of solar energy resources. When water needs to be pumped during droughts, it is often when the solar radiation energy is the strongest; and the demand for water in cloudy and rainy days is correspondingly less. On the other hand, the sun When the radiation is strong and the evaporation of water is large, the water pump can pump more water; when the solar radiation is weak, the water can be pumped less or not. In addition, after the basic water use is solved, the system can be used as a distributed power system and integrated into the large power grid without modification: or to supply power to other electricity users.
The successful development of the photovoltaic water pump has important practical value and practical significance for the drought resistance and disaster prevention work in Yunnan and the whole Southeast Asia in the dry season in winter and spring every year. If the new technology products of this scientific and technological achievement can be paid attention to by local governments at all levels, they can be comprehensively promoted and applied in the whole province of Yunnan. The progress of civilization will play an immeasurably important role. Photovoltaic water pumps also have potential wide application prospects and huge commercial market value in Southeast Asia, South Asia, West Asia and Africa.