The mathematical model of new converter transformer based on polymorphic phase-coordinate method

Compared with the traditional converter transformer, the new converter transformer has a unique connection. Based on the principle of the transformer coupling circuit and the actual design parameter of the transformer, the three-phase mathematical model which includes the information about the new converter transformer's wiring feature, the electrical parameters, etc, is presented according to the polymorphic phase-coordinate method. When solving the mathematical model this paper has carried out the unification of single-phase and three-phase calculations by regarding matrices and vectors as the operational basic elements. Considering the symmetry of network parameters, it adopted the equivalent transform technology of polymorphic equations to reduce the calculation amount. Calculation results have verified the correctness of the created model and the solution of the model. This kind of modeling and solution method is simple, and with high computational efficiency and precision. It has universal significance to solve various complicated transformer modeling and solution problems.