Construction and equivalence of single-machine model of renewable energy for large-scale power system simulation

Establishing an accurate renewable energy unit model is the basis for researching the impact of large-scale renewable energy access on the system. However, only the blackbox model of the manufacturer can be obtained in the actual modeling work. And the multi-manufacturer models and multi-control modes of renewable energy units (REU) also bring difficulties to simulation modeling and analysis. Firstly, the need and necessity of the structured model are analyzed. The combination strategies of "switching control" and "transient control" is put forward, and it is pointed out that the high voltage ride-through (HVRT) and low voltage ride-through (LVRT) control mode of REU has analytical consistency. Then, taking the doubly-fed induction generator (DFIG) as an example, based on a large number of HVRT and LVRT response characteristic curves of the DFIG and the detailed fault response stage division, the fault ride-through characteristics are analyzed. And an equivalent model of "switching control" with multiple response periods combined with multiple control modes is constructed. Then the electromagnetic transient model of the whole working condition was established on the basis of the general fault ride-through equivalent "switching control" and "the steady-state power control", "transient control" strategy of the DFIG. Finally, simulation and error analysis verify the proposed model's effectiveness and applicability.