Research on Large Angle Control Strategy for Ultrahigh Voltage Direct Current Transmission System
When the direct current transmission power of the hierarchical access converter station is adjusted and the grid-side voltage fluctuates,affected by the constraints of conventional control methods,the tap changer of the converter transformer in the converter station at the receiving end suffers frequent over polarity,which leads to a slow increase of acetylene volume fraction.A large angle control strategy is proposed to reduce the frequency of over polarity of the converter transformer tap changer.The con-trol strategy prioritizes the adjustment of the steady state range of the converter valve extinction angle,which enables the converter transformer tap changer to operate at a stable position for a long time.The simulation tests prove that when the direct current trans-mission power is adjusted over a wide range and the grid-side voltage fluctuates,the large angle control strategy is able to signifi-cantly reduce the frequency of tap changer over polarity and improve the operation reliability of the converter transformer.
large angle control strategyultrahigh voltage direct current transmissionconverter transformertap changer
NETL
NSTL
万方数据
