Solar photovoltaic power generation technology has made rapid progress with the continuous utilization of new energy sources. There are also increasing research methods for the components of photovoltaic power generation. This article takes solar inverters as the research objective and analyzes their control strategies. The main work of the paper is as follows:
(1) Firstly, a detailed mathematical model of solar photovoltaic cells in solar photovoltaic arrays was derived and studied. By establishing an electromagnetic transient simulation model of solar photovoltaic arrays, the output characteristics of solar photovoltaic arrays and the impact of external environmental changes on them were studied. Based on the equivalent circuit diagram of solar photovoltaic cells under actual conditions, a model of solar photovoltaic cells in the solar photovoltaic power generation system was built and simulated using PS and CAD simulation software.
(2) Based on the mathematical model of solar inverters, a feedforward decoupling control strategy for solar inverters in the d-q coordinate system was designed. Starting from the topology of grid connected solar inverters, a detailed mathematical model is derived, and the traditional double closed-loop control strategy of voltage outer loop and current inner loop control is deeply studied. Vector oriented control technology is used to achieve decoupling control of active and reactive power of solar inverters.
(3) This paper introduces a method based on fuzzy logic control to study the maximum power point of solar photovoltaic cells. This method does not require an accurate mathematical model and can still accurately track the maximum power point. A simulation model is established to simulate the tracking of the maximum power point.
(4) With the goal of compensating for the reactive power required by the system when solar photovoltaic power stations are connected to the power grid, a reactive power control strategy for the operation of photovoltaic power stations is constructed, and p suitable for optimizing photovoltaic power stations is analyzed and obtained- λ The operation relationship curve can save the cost of configuring reactive power compensation devices and reduce line losses. Taking the actual operation of a solar photovoltaic power plant as an example, the effectiveness and practicality of the control strategy were evaluated.