Classification and characteristics of topology structure of unschedulable photovoltaic grid-connected power generation circuit
Photovoltaic power generation technology

Classification and characteristics of topology structure of unschedulable photovoltaic grid-connected power generation circuit

Different focus points make the classification of photovoltaic grid-connected power generation systems slightly different. The following three aspects are classified and explained. According to the connection method of photovoltaic cell modules and power electronic conversion circuits From the perspective of the connection method between photovoltaic cell modules and power electronic conversion circuits, photovoltaic grid-connected power […]

How a digital phase locked loop works
Digital Phase Locked Loop Technology

How a digital phase locked loop works

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 […]

What is the status and development prospect of photovoltaic power generation in various countries in the world?
Photovoltaic power generation technology

What is the status and development prospect of photovoltaic power generation in various countries in the world?

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 […]

What are the two methods of islanding detection?
Basics of photovoltaic cells

What are the two methods of islanding detection?

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 […]

Island Phenomenon and Protection Standards
Island protection technology

Island Phenomenon and Protection Standards

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, […]

What is the power stepping method?
Maximum power point tracking technology

What is the power stepping method?

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 […]

What is the intermittent variable step search method?
Maximum power point tracking technology

What is the intermittent variable step size search method?

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 […]

Incremental conductance method, fuzzy control method and neural network control method
Maximum power point tracking technology

Incremental conductance method, fuzzy control method and neural network control method

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 […]

What is the disturbance observation method?
Maximum power point tracking technology

What is the disturbance observation method?

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 […]

What is the true maximum power point tracking method?
Maximum power point tracking technology

What is the true maximum power point tracking method?

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 […]