The research, test and verification of the HVDC centralized control system

The necessity of the HVDC centralized control system is analyzed, and studies confirm its feasibility. Building a HVDC centralized control system to integrate all of the independent HVDC systems, is helpful to: (1) reducing the requirements of human resources and equipments, centralizing and strengthening the maintenance team, enhancing maintenance capabilities internally, (2) achieving the state of centralized monitoring-controlling and the high-level coordinate control with synthesized and optimized strategy. The designing principles of the centralized control centre are studied, and the key technologies need be verified are determined. To determining the HVDC centralized control system´s feasibility and implementation procedure, it is necessary to build an appropriately simplified test system to verify all the involved software and hardware, the communication network, and the project organization and implementation procedure, carefully. The test tells, (1) The set of the HVDC centralized control system will not affect the safe operation of the original SCADA system in the converter station, but will get a backup system one more. (2) The HVDC centralized control system can receive all real-time data and SERs that are consistent with the original SCADA system without lost, (3) and can successfully execute all kinds of the HVDC control types such as deblocking the HVDC system and putting it into operation. (4) Based on the network communication middleware, the delay (<;20ms) of the data transmission is in a range that can not be sensed. With a huge amount of data, the 2M-channel fully meet the real-time requirements of the transmission of data and commands (normally about 7.9KBps, in fault 20.9KBps) in the bandwidth test. (5) Benefitting from the distributed software architecture, the HVDC centralized control system can effectively withstand the stress test (18,000 data/second, CPU load rate <;22%) caused by simulated faults happened in all existing and pl- nned HVDC systems (10 converter stations) at the same time.