A kind of negative sequence impedance parameter evaluation method of three-phase imbalance disturbance source locating

The present invention relates to a kind of negative sequence impedance parameter evaluation method of three-phase imbalance disturbance source locating, methods described includes (1) collection measurement data；(2) more moment KVL equations are established；(3) based on the constant sampled data of line-of-sight course selection system side；(4) there is the sampled data of fluctuation based on load fluctuation rate selection load side；(5) object function solving system negative phase-sequence equivalent impedance parameter is established.The present invention is based on the more moment voltages of PCC, current sampling data, by solving more moment KVL equation estimation negative sequence impedances, it is not necessary to synchronously sampled data, do not influenceed by system frequency change, compared with the method for needing synchronously sampled data, the more flexible simplicity of sampled data process；The data that load side fluctuates and system side is constant can effectively be selected based on " line-of-sight course "；Method based on load fluctuation rate extracts data during load fluctuation, can effectively filter out noise, avoids the influence of transient state, reduces estimation error.