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

On September 1, the inverter-based photovoltaic power station reactive voltage control system (AVC system) developed by the China Electric Power Research Institute was successfully put into operation at the Jinyang 100MW photovoltaic power station in Feidong, Anhui.

It is understood that this research is a research topic in the 863 Project "Research on Key Technologies for Grid-connected Large-scale Photovoltaic Power Stations". The project was jointly undertaken by China Electric Power Research Institute, Hunan University, Shandong University, Chongqing University and North China Electric Power University. It took 4 years and successfully passed the technical acceptance organized by the Ministry of Science and Technology on March 10, 2016.

Restricted by the AVC system communication method and control mode, the powerful reactive power regulation capability of the photovoltaic inverter itself has not been fully utilized, and photovoltaic power stations still need to be equipped with a large number of dynamic reactive power compensation devices, which brings huge subsequent operation and maintenance costs to the power stations and causes waste of investment.

After years of research, China Electric Power Research Institute has made breakthroughs in key technologies such as inverter fast communication, reactive-voltage adaptive fast droop control, AVC partition and layered coordinated control, and successfully developed an inverter-based photovoltaic power station reactive voltage control system, realizing reactive-voltage droop control, constant voltage closed-loop control, constant reactive power control, constant power factor control and night reactive support functions.

The development of the inverter-based photovoltaic power station reactive voltage control system has realized the fast active reactive voltage control of the photovoltaic power station based on the inverter, which can greatly reduce the SVG installation capacity in the photovoltaic power station and save the construction and operation and maintenance costs of the photovoltaic power station.

Since its commissioning, a large amount of operating data has shown that the research results can meet the requirements of national and industry standards such as GB/T 19964 "Technical Regulations for Connection of Photovoltaic Power Stations to Power Systems" for reactive voltage regulation of photovoltaic power stations.

In addition, a 100MW photovoltaic power station using the AVC system can save nearly 2 million yuan in initial investment costs for dynamic reactive power compensation devices and hundreds of thousands of yuan in annual operation and maintenance costs, with significant economic benefits. This is of great significance to the large-scale development of photovoltaic power stations and their coordinated development with the power grid.