Constant power adaptive control of photovoltaic generator unit considering equivalent charge state

Abstract To address the impact of factors such as light intensity, temperature, equipment aging, and faults on the power output stability of photovoltaic power generation units during operation, a constant power adaptive control method for photovoltaic power generation units based on equivalent charge state is proposed. By real-time monitoring of the output voltage, current, and other parameters of photovoltaic power generation units, we calculate their current equivalent charge state. Based on the changes in the equivalent charge state, the control strategy of the photovoltaic power generation unit is adaptively adjusted, and the harmonic distortion rate weight is calculated by using the entropy method to control the fluctuation of the system output power. We analyze the power generation under harmonic constraints to construct a photovoltaic generator system model. The experimental results show that under the equivalent charge state, photovoltaic power generation units can achieve constant power output while improving the operational efficiency and stability of the system. Compared with traditional control methods, the method proposed in this article not only improves the stability of the power output of photovoltaic generators but also extends the service life of batteries and reduces maintenance costs.