In depth research has been conducted on the control strategy of three-phase solar inverter inverter systems, and the main conclusions are as follows:
(1) A series of modeling and simulation have been conducted for photovoltaic power generation systems. A photovoltaic cell model was established based on the performance parameters and equivalent circuit diagram of the photovoltaic cell, and the performance parameters of the photovoltaic cell were corrected. The simulation of photovoltaic cells was conducted by adjusting the environmental compensation coefficient, and the simulated characteristic curve was basically consistent with the actual measured curve, thus proving the feasibility of establishing a photovoltaic cell model using this method. On the basis of analyzing the mathematical model of solar inverters, the traditional dual closed-loop control strategy of voltage outer loop and current inner loop control was deeply studied, and vector oriented control technology was adopted to achieve decoupling control of active and reactive power of solar inverters.
(2) When studying the maximum power tracking method, a maximum power point tracking method based on fuzzy logic control for full load current was adopted. By comparing this method with traditional methods, it can be seen that it has more accurate tracking and can still accurately track the maximum power point without the need for accurate models and data.
(3) With the goal of compensating for the reactive power required by the system, a solar inverter reactive power control strategy is constructed for the operation of photovoltaic power plants, and a P-A operation relationship curve suitable for photovoltaic power plants is obtained. Based on a photovoltaic power station in Qinghai Province, a PSAT simulation model was constructed. The feasibility of the control strategy adopted in this paper was demonstrated through analysis, and the annual energy-saving benefit of reducing line losses was calculated to be 25500 yuan.