An equivalent method of power network for the background harmonic prediction

AC filter parameters design of DC transmission project needs equivalent network of converter station drop point area. By establishing the correct equivalent network for harmonic power flow calculation, the converter station background harmonic voltage can be obtained. In view of the problem that how to realize the network equivalent of complex systems, we study the influence of the mutual impedance branch on the voltage distortion, simplify the equivalent impedance, and put forward a kind of network equivalent method applicable to background harmonic prediction. This method is simple and easy to implement, and effectively solves the problems that mutual impedance branches are more complex and may appear negative resistance causing abnormal time-domain simulation. In addition, the actual example verifies that this method is effective and has important engineering reference value.