Study On The Power System Operation Effected By The Ning-Dong ±660kV HVDC Project

The Ning-Dong HVDC interconnection project which is 1373km long and the designed-power ratings is 8000MW will be put into production in 2012 by the plan formulated by the State Grid. The first HVDC Line will be built in single-pole mode in 2010 and the transmission power is 2000MW. The transmission capacity of the first Line will be increased to 4000MW in double-pole mode in 2011. The lineⅡwill go into production in 2013 and then the transmission capacity will be 8000MW. The project operates at±660kV and the receiving end locates in Qingdao.The power transmitted into Shandong province through the Ning-Dong HVDC and Shandong-North China AC line (500kV) will be 6000MW-7000MW. The transmission capacity will be more than 12 percent of the load total quantity in Shandong, and the Shandong power net will change to the classic receiving system. There will appear some new problem in the power system operation in the new Hybrid AC/DC System.The feasibility of the Ning-Dong HVDC Line with 4000MW transmission capacity is studied. Some security-control measures are put forward when the Ning-Dong HVDC project go into production and the power exchanged between the Shandong power system and UHV net is given consideration. The adaptability of the Shandong power-net after the Ning-Dong first line put into production in single-mode in 2010 is analyzed in detail based on the planning-operation data presented by the Shandong Power Dispatching Centre. The stability and security of the Shandong system in the standard operation-mode when all of the Ning-Dong project go into production is also studied and some useful suggestion for the safety-operation of the power system is put forward.