It is understood that this research is a research topic in the “Project of Key Technologies for Large-Scale Photovoltaic Power Plant Grid Connections†of the 863 Program. This issue was jointly undertaken by the China Electric Power Research Institute and Hunan University, Shandong University, Chongqing University and North China Electric Power University. It took 4 years and passed the technical acceptance inspection organized by the Ministry of Science and Technology on March 10, 2016.
Constrained by the communication mode and control mode of the AVC system, the photovoltaic inverter itself has a powerful reactive power adjustment capability and has not been fully utilized. Photovoltaic power stations still need to configure a large number of dynamic reactive power compensation devices, which brings a huge period of power generation to the power station. The cost of operation and maintenance leads to a waste of investment.
After many years of research, China Electric Power Research Institute has broken through key technologies such as inverter fast communication, reactive-voltage self-adaptive rapid droop control, and hierarchical AVC partitioned coordinated control, and successfully developed a photovoltaic-based power station reactive voltage based on inverters. The control system realizes the functions of reactive-voltage droop control, constant voltage closed-loop control, constant reactive power control, constant power factor control, and night reactive power support.
The inverter-based photovoltaic power plant reactive voltage control system was developed to implement a photovoltaic-based power plant based on inverter-based fast active reactive voltage control, which can significantly reduce the SVG installation capacity in photovoltaic power plants and save the cost of photovoltaic power plant construction and maintenance.
Since it was put into operation, a large amount of operational data has shown that the research results can meet the requirements of national and industrial standards such as GB/T 19964 "Technical Regulations for Photovoltaic Power Plant Access Power System" and the requirements for reactive voltage regulation of photovoltaic power stations.
In addition, the 100MW photovoltaic power station using this AVC system can save the initial investment cost of a dynamic reactive power compensation device of nearly 2 million yuan and the operation and maintenance cost of several hundred thousand yuan per year, and the economic benefits are very significant. This is of great significance for the large-scale development of photovoltaic power plants and the coordinated development of the power grid.
Ion exchange resin is a crucial component used in glass fiber reinforced plastic pressure tanks to effectively remove both anions and cations present in water, ultimately softening the water.
The ion exchange resin works through a process known as ion exchange, where it replaces undesired ions in the water with more desirable ones. This resin is typically made up of small, porous beads that contain charged functional groups.
When water passes through the pressure tank containing the ion exchange resin, the resin beads attract and retain the unwanted anions and cations present in the water. These unwanted ions, such as calcium, magnesium, iron, and sulfates, are exchanged with more desirable ions like sodium or potassium.
The exchange process occurs as the water flows through the resin bed, allowing the resin beads to selectively trap the unwanted ions and release the desired ions. This effectively removes the minerals responsible for water hardness and replaces them with softer ions, resulting in softened water.
Softened water offers various benefits, including preventing scale buildup in pipes and appliances, improving the efficiency of water heaters, reducing soap scum and residue on surfaces, and providing better lathering and cleaning capabilities.
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