Research on Relay Protection Scheme for Distribution Network With Distributed Generation
The uncertainty of the fault current of the distribution network with Distributed Generation(DG)leads to the high error rate of relay protection,so a relay protection scheme with DG distribution network is designed.Based on the operation data of the distribution network such as DG output,network topology and real-time load state,the island area of the distribution network is divided,and the independent power supply area formed in the case of fault is defined.On this basis,we comprehensively consider the propagation path of the fault current and the action logic of the protection device.According to the results of the model analysis,a detailed distribution network relay protection scheme is formulated,so that the protection device can quickly isolate the failure area when the fault occurs and prevent the failure expansion,so as to ensure the stable operation of the distribution network.The experimental results show that the misoperation rate of the relay protection scheme with DG distribution network in the fault sample is 0.005%,which is much lower than other schemes,which proves that the relay protection scheme is excellent in misoperation rate and has higher stability and reliability.Compared with other schemes,it is more helpful to reduce unnecessary power failure accidents,and it is suitable for practical applications.
Distributed Generation(DG)distribution networkrelay protection schemeisland area
NETL
NSTL
万方数据
