The Development Of Digital Freguency Voltage Control Device

With large number of new large-scale substation using and large capacity units grid connected operation, the scale of power system is increasing large. Although it has high economic benefit, it will cause the collapse of frequence and voltage collapse and other instability problem when there is large disturbance.A new kind of digital frequency voltage control device is designed based on IEC61850 protocol system. The device determine the principle of active power gap size directly according to the frequency decrease rate, and decide load reduction rapidly or delay, therefore suppresses the frequency decreased effectively and improves the frequency stability of the system. The hardware anti interference and software anti interference used in the course of development of the device to improve the reliability of the system. In order to avoid using a large number of cable, digital signal transmission style and digital signal processing network are used. It not only reduce the reliability of its connection, the device can be improved.Moreover, in order to meet the engineering requirement of configuration and scalability requirements, the paper uses the visual programming interface,which could complete software configuration and man-machine interface configuration for the system,.For the GOOSE, and SV configuration, it specially completed by the interface configuration visualization debugging through Ethernet port. Finally, the frequency voltage control device developed in this paper is used in 35 kV substation of Xinjiang production and construction corps 188 group. Through 2 years normal operation, the safety and the reliability of this device is demonstrated.