Algorithm for quickly calculating effective value through alternating current sampling

The invention discloses an algorithm for quickly calculating an effective value through alternating current sampling, and relates to the field of effective value algorithms, which comprises the following steps of: sampling two continuous points of a sine alternating current signal to obtain data values of the two points, obtaining an expression of a signal peak value through the data values of the two points, and carrying out period limitation on the sine alternating current signal to obtain an effective value of the sine alternating current signal. According to the method, the effective value of the alternating current signal can be obtained only by sampling data of two points, the time for actually obtaining the effective value is only related to the sampling frequency and is not related to the period of the actually measured alternating current signal, and the method can be widely applied to occasions with strict requirements on the real-time performance, such as various protection systems and the like. Ac