Abstract :
With a large number of PV power station integrated to the grid, some problems such as the grid-connected stability, relay protection, etc. brought out by it. In this paper, dynamic modelling and control strategy of grid-connected PV power stations were researched based on DIgSILENT. First, the equivalent model for PV power station was established consisting of PV arrays, power inverters, transformers, transmission line and grid. Second, control system including maximum power point tracking control, voltage and current double-loop control and relay protection control was modelled. Finally, based on a 10MW grid-connected PV power station in the northwest of China, simulations were given to verify the dynamic model and control strategy of PV power station.
Keywords :
electric current control; invertors; photovoltaic power systems; power generation control; power grids; power transformers; power transmission lines; relay protection; voltage control; China; DIgSILENT; PV arrays; PV grid; PV power station; PowerFactory; control strategy; control system; current double-loop control; dynamic modelling; grid-connected PV power stations; grid-connected PV system modelling; grid-connected PV system simulation; grid-connected stability; maximum power point tracking control; power 10 MW; power inverters; power transformers; relay protection control; transmission line; voltage double-loop control; Control Strategy; DIgSILENT; Dynamic Modelling; Grid-connected; MPPT; Maximum Power Point Tracking; PV;
