The inverter-based reactive voltage control system of photovoltaic power station was successfully put into operation

Recently, the inverter-based photovoltaic reactive voltage control system (AVC system) developed by the China Electric Power Research Institute was successfully put into operation at the 100MW photovoltaic power station in Jinyang, Feidong, Anhui
.

It is understood that this research is a research topic
in the 863 project "Research on Key Technologies for Grid Connection of Large Photovoltaic Power Plants".
The project was jointly undertaken by the China Electric Power Research Institute, Hunan University, Shandong University, Chongqing University and North China Electric Power University, which lasted for 4 years and successfully passed the technical acceptance
organized by the Ministry of Science and Technology of the People's Republic of China on March 10, 2016.

Subject to the AVC system communication mode and control mode, the photovoltaic inverter itself has a strong reactive power regulation ability has not been fully utilized, photovoltaic power station still needs to be equipped with a large number of dynamic reactive power compensation devices, which brings huge later operation and maintenance costs to the power station, resulting in waste
of investment.

After years of research, CETC has broken through key technologies such as inverter fast communication, reactive-voltage adaptive fast droop control, AVC zoning hierarchical coordinated control, and successfully developed a reactive voltage control system for photovoltaic power stations based on inverters, realizing 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 development of inverter-based reactive voltage control system for photovoltaic power plants realizes the fast and active reactive voltage control based on inverters in photovoltaic power plants, which can greatly reduce the SVG installation capacity in photovoltaic power plants and save the construction and operation and maintenance costs
of photovoltaic power plants.

Since it was put into operation, a large number of operating data show that the research results can meet the requirements
of national and industry standards such as GB/T 19964 "Technical Regulations for Photovoltaic Power Station Access to Power System" for reactive voltage regulation of photovoltaic power stations.

In addition, the 100MW photovoltaic power station using the AVC system can save nearly 2 million yuan in the initial investment cost of the dynamic reactive power compensation device and hundreds of thousands of yuan in operation and maintenance costs per year, and the economic benefits are very significant
.
This is of great significance to the large-scale development of photovoltaic power plants and the coordinated development of
the power grid.