Optimisation study of PV grid-connected control based on cuckoo search algorithm

The control strategy of photovoltaic grid-connected inverters is crucial for improving power system stability and efficiency. In this paper, the voltage equations in the three-phase stationary coordinate system are established, and the Park coordinate transformation is performed on the equations. The instantaneous active power and instantaneous reactive power models injected into the grid by the inverter are obtained after the transformation. The article designs a rotating coordinate system based on grid voltage vector orientation, whereby precise control of the grid current injected into the inverter is achieved. At the same time, the PI controller parameters are optimised using the cuckoo search algorithm, and the dynamic response performance of the system is significantly improved. Finally, the effectiveness of the proposed control strategy is verified through simulation experiments, and it is demonstrated that the method can considerably enhance the support of the system to the grid operation scheduling.