Study On Improving The Reliability Of The Node Protection Of SVC System In 500kV Substation

At present,the main grid frame of the Southern China Power Grid already has 15 large-scale channels for the East and West power supply,and the entire grid structure is characterized by ultra-high voltage,long-distance and large capacity,while the Flexible transmission capacity accounts for more than 60%of the total West and East power supply capacity.The main grid structure of the whole Southern power grid has its own unique characteristics.The appropriate dynamic reactive power compensation technology can increase the voltage and reactive power regulation capacity of the power grid,improve the transmission capacity of the transmission line and the stability of the entire power system.At first,this paper introduces the application and development of reactive power compensation technology at home and abroad,introduces the installation and operation of SVC equipment on the main channel of the South Grid,and analyzes its importance to the voltage support of the main grid frame of the South Grid.The principle of reactive power compensation of the SVC device is described.Taking a 500kV substation SVC system as an example,the structure and control strategy of the 500kV substation SVC system are described in detail.The operation of SVC control and protection system in 500kV substation is introduced.This paper analyzes the phenomenon of node protection error in the SVC control and protection system.It is believed that most of the reasons for node protection error actions are that the protection definite value is not reasonable enough and the SVC system node protection logic is not perfect enough.Based on the typical action situation in the operation of the SVC system,this paper analyzes the logic of node protection and other related protection,and puts forward relevant protection ratings and logical optimization measures.According to the relevant optimization measures,the simulation test and the actual state test after the field program optimization are carried out to verify the feasibility of the related optimization measures.According to the relevant test results,this paper puts forward some suggestions to improve the operation reliability of SVC node protection.The operation shows that the optimization and improvement measures proposed for the protection of the SVC system of the substation are reasonable and effective.