Q-axis excitation control device of double-axis excitation phase modifier

The invention discloses a q-axis excitation control device of a double-axis excitation phase modifier. The q-axis excitation control device comprises a K60 hardware platform, an alternating current sampling module, a rotating speed and torque sensing module, a switching value input and output module, a thyristor driving module, a communication module, a man-machine interface module and a power supply module. The phase modifier can flexibly operate under the working conditions of single-axis excitation, double-axis excitation and positive and negative alternating excitation, the limitation thatthe minimum exciting current is zero is broken through, the phase modifier obtains the short-time phase advance capacity equivalent to the delayed phase overload capacity through reverse excitation,the overvoltage suppression effect of unit installation is greatly improved, the problems of out-of-step and violent power fluctuation of the double-shaft excitation phase modifier under the reverse excitation working conditio