Research On The Application Of UHV DC Transmission Control And Protection Technology

Since China put forward the concept of global energy internet,more than 140 countries have issued corresponding energy development policies.As the backbone of global energy internet,UHV AC and DC have made important progress,and the national power grid has entered the era of UHV.DC transmission overcomes the loss of inductance,and only the loss of conductor resistance.HVDC transmission technology is mainly used in ultra-long-distance large capacity transmission,interconnection of power systems,long-distance island power supply or underground cable power transmission in large cities.HVDC transmission has the advantages of large transmission capacity,low loss,overcoming synchronization requirements of AC interconnection and small impact on power grid when faults occur.It is especially suitable for long-distance end-to-end high-power transmission,while the AC transmission system is convenient for multi-terminal transmission.The combination of AC and DC transmission will be the main development trend of power transmission system in the future.The HVDC control system is mainly applied to the HVDC transmission control and protection field.It provides a complete set of automatic control and relay protection equipment and technology for HVDC transmission project,back-to-back interconnection project,flexible HVDC transmission project and UHVDC transmission project.Pole control system and AC/DC station control system adopt double design,DC protection adopt triple design,exit adopt triple logic,AC protection adopt complete double design.Any set of independent protection configuration will not affect the operation of other independent equipment and the normal operation of the whole system when it completely exits due to failure,maintenance and other reasons.In this paper,the dc control system,dc protection system and network system configuration are studied...