Welcome to the information network of solar photovoltaic power technology. Here, we provide information about photovoltaic cells, solar power system circuit topology and on grid solar system Inverter control strategy, etc.
As more and more photovoltaic grid-connected power generation systems are connected to the power grid, the power quality of the power grid has attracted more and more attention. In order to achieve reliable grid connection without current impact, the grid-connected photovoltaic power generation system must make the amplitude, phase and frequency of the filtered inverter […]
Status of PV power generation in EU According to the forecast of the European Union, in the middle of the 21st century, the photovoltaic power generation capacity will account for about 40% of the total power generation of the whole EU, so it can be said that the 21st century is the century of solar […]
At present, many different islanding detection methods have been proposed. Generally speaking, islanding detection methods can be divided into two categories: remote technology and local technology. ①Remote technologyThe remote technology is to complete the detection through the communication between the power grid and the distributed power sources. It refers to the communication between the power […]
When the public grid is cut off or the distributed power generation (DG) system is disconnected from the public grid, the distributed power generation system continues to work and forms a self-sufficient island system with the surrounding loads. As shown in Figure 1, a typical photovoltaic grid-connected power generation system includes a switching switch 1, […]
In a single-stage three-phase or single-phase photovoltaic grid-connected power generation system, the stable operating point of the photovoltaic array is in the right area including the maximum power point, and the left area of the maximum power point is the unstable operating area. In the unstable area, the trajectory of the output voltage of the […]
The intermittent variable step length search method is a new method that organically combines the constant voltage method and the variable step length disturbance observation method. The method is specifically divided into the following three stages, as shown in Figure 1. In the figure, ① represents the first stage-the start-up phase, ② represents the second […]
①Incremental conductance methodIncremental conductance method is to realize the tracking of the maximum power point by adjusting the voltage of the working point to gradually approach the voltage of the maximum power point. The incremental conductance method avoids the blindness of the disturbance observation method. It can determine the relationship between the operating point voltage […]
Due to its simple structure and easy implementation, the perturbation observation method is currently one of the commonly used methods to implement MPPT. The principle is to increase or decrease the output voltage or current of the photovoltaic array at a certain interval of time, and observe the direction of power change thereafter to determine […]
The true maximum power point tracking method requires real-time measurement of voltage and current, and judges the changes in the operating point of the photovoltaic array through the voltage and current values, thereby realizing the optimization of the operating point. The advantage of this type of method is that it is not affected by factors […]
The quasi-maximum power point tracking method includes mathematical formulas or tables obtained from empirical data, such as curve fitting method and pre-stored data comparison look-up table method, as well as sampling and control based on a single output parameter of the photovoltaic array, for example, using open circuit voltage method, short circuit method, etc. Current […]