The invention relates to an angle-type STATCOM based on feedforward control of
power grid voltage and a control method of the angle-type STATCOM. The control method comprises steps of superposing output quantity of a feedforward controller on the output quantity of a current inner ring, and judging whether the
power grid is in a
steady state or in a
transient state before the STATCOM is unlocked; if the
power grid is in the
steady state, using a feedforward item based on power
grid voltage phase angle compensation as the output quantity of the feedforward controller, and after a
control system is stable, switching to take the feedfoward item based on direct acquisition of power
grid voltage as the output quantity of the feedforward controller; and if the power grid is in the
transient state, using the feedfoward item based on direct acquisition of power
grid voltage as the output quantity of the feedforward controller. According to the invention, it can be achieved that the
impact current is smallest during unlocking under the condition that the power grid is in the
steady state; based on the feedforward item of the power grid
voltage, true conditions of the power grid
voltage can be well reflected under the condition that the power grid is in the
transient state; the smaller the sampling
delay time of the power grid voltage is, the smaller the
delay time of the
control system is; and excellent current control performance can be acquired. Thus, by combining advantages and avoiding the disadvantages of two kinds of the feedforward items, the performance of the STATCOM is improved.