Improve angle control circuit that puts off arc of commutation failure of direct current transmission system restorability

The utility model provides an improve angle control circuit that puts off arc of commutation failure of direct current transmission system restorability, including non - linear modulation unit, proportional integral unit and the pulse trigger unit that connects gradually, non - linear modulation unit is to the first angle deviation signal modulate that puts off arc of input to the output second angle deviation signal that puts off arc, the second angle deviation signal that puts off arc is received to the proportional integral unit, with self input mark for the third angle deviation signal that puts off arc to computing relay angle controlled quantity, the pulse trigger unit is received and is triggered the angle controlled quantity, and controls the break -make of direct current converter thyristor in view of the above. The utility model has the advantages of can effectively avoid exchanging the commutation failure that the back transverter was clear away to the trouble to direct current active power's recovering with higher speed restraines direct current reactive power's consumption to a certain extent.