Characteristic curve parameter identification method and system for operating impact lower voltage limiter

The invention discloses a characteristic curve parameter identification method and system for operating an impact lower voltage limiter. The method comprises: measuring a current signal of the operation impact lower voltage limiter, and determining parameters of equivalent resistance, inductance and capacitance of an operation impact discharge loop; obtaining a voltage limiter operation impact loop equivalent model according to the equivalent resistance, inductance and capacitance parameters, and constructing an impact circuit differential equation containing nonlinear curve parameters; calculating a polynomial chaotic configuration point coefficient matrix X according to the constructed impact circuit differential equation; calculating operation matrixes Dyy and DXy by utilizing the polynomial chaotic configuration point coefficient matrix, and constructing a maximum likelihood estimation objective function according to the formula shown in the specification; calculating based on an L-M optimization method,