Control method for suppressing low frequency oscillation operation risk of distribution network

The invention discloses a control method for suppressing the low frequency oscillation operation risk of a distribution network. The voltage of the two ends of a SVG capacitor is supplied to a controller. The controller compares the detected udc with the given reference voltage Udc* and performs PI calculation of the calculation results to take the output as the output of the controller current id. The rotational speed signal or the power angle signal is sent to the controller, the detected rotational speed is compared with the given rotational speed after selecting the control mode, the detected rotational speed is sent to a PID regulator for regulation and the result is compared with the detected current iq and PI calculation is performed. The id and the iq outputted by the PID controller are sent to a coordinate inverse converter, the output is the three-phase current in a three-phase static coordinate system, the output result is compared with a triangular wave and the output directly controls the conduct