What is the principle of three-phase inverter bridge

A three-phase inverter bridge (also known as a three-phase inverter module) is a power electronic device that converts three-phase alternating current (AC) to direct current (DC) and then DC to three-phase AC. This device is commonly used in renewable energy systems such as wind, photovoltaic and solar power.

The three-phase inverter bridge usually consists of six semiconductor transistors, each of which has two polarities, positive and negative. These transistors are regulated by circuits that control their switching states to regulate the current.

In the operation of a three-phase inverter bridge, three-phase alternating current (AC) is fed into one end of the bridge, which is then controlled by the circuit and converted into direct current (DC), which is then output from the other end of the bridge. In this way, the three-phase alternating current is converted into direct current. During reverse operation, DC power is input to one end of the bridge, then controlled by a circuit, converted to three-phase AC power, and then output from the other end of the bridge. In this way, DC can be converted into three-phase AC.

The advantage of the three-phase inverter bridge is that it allows for efficient regulation of current and has high reliability and durability. Its disadvantages are that it is more expensive, consumes more energy, and requires a high level of skill to manufacture and maintain. However, with the development of technology, the cost and energy consumption of three-phase inverter bridges are decreasing, making it widely used in the field of renewable energy.

Three-phase inverter bridges operate on a complex principle, and the exact circuit structure and control methods may vary from model to model and manufacturer to manufacturer. Typically, a three-phase inverter bridge consists of several circuit modules, each with its own function and role.

There are a number of control algorithms that are used to regulate the current during the operation of a three-phase inverter bridge. These algorithms can be divided into two categories: frequency tracking algorithms and voltage tracking algorithms. The frequency tracking algorithm controls the operation of the three-phase inverter bridge based on the frequency of the input voltage, while the voltage tracking algorithm controls the operation of the three-phase inverter bridge based on the amplitude of the input voltage.