Conventional HVDC system normal control mode

With the increasing power transmission and conveying distance scale gradually lengthened, the existing level ± 500kV DC transmission will not be able to meet the requirements, the objective need to adopt a higher level of DC transmission voltage levels. According to the Southwest Water outgoing transmission planning programs of research and related research conclusions combination of foreign, ± 800kV DC  Stainless steel needle valve feasible, more suitable for China's actual situation. In the conventional HVDC system's normal control mode, the rectifier side of the DC power required to calculate the dc current command, according to the current measurement value and the current value of the deviation obtained by proportional integral part of the firing angle to control the DC current while the commutation  Valve manifolds  tap slow  Trunnion ball valve  the firing angle as the reference value in the range of ± 2.5 °. Inverter side using constant extinction angle control, constant DC voltage control method combining with rectifier side HVDC control system together constitute the basic closed-loop control. ± 800kV DC transmission uses two 12-pulse inverter in series wiring, this wiring to make it run way more diverse.