Neutral point small reactance value taking method of magnetic control type controllable reactor

The invention discloses a neutral point small reactance value taking method of a magnetic control type controllable reactor. The method comprises the following steps of: step 1, giving a voltage expression of an open-phase position of a three-phase power transmission line with a magnetic control type controllable reactor; and step 2, calculating the value range of the small reactance of a neutralpoint by taking the realization of a small value of the open-phase voltage as an objective according to the following principles: 1, the small reactance of the neutral point enables the voltage expression to be far away from a singular point, 2, the small reactance value of the neutral point enables a voltage expression coefficient to be -1; and 3, selecting a plurality of small reactance values in the value range obtained in the step 2, and determining the small reactance value of the neutral point according to specific requirements. According to the small reactance value taking method, the small reactance value of t