By connection type
It is divided into off-grid inverter and grid-connected inverter.
topologically
It is divided into two - level inverter, three - level inverter and multi - level inverter.
By power grade
It is divided into High frequency power inverter, medium power inverter and Low frequency power inverter.
A common type
Medium and small-sized electricity
Middle and small power inverter is one of the important link of photovoltaic system for household independent communication, its reliability and efficiency for the promotion of pv systems, energy efficiency and reduce the system cost is important, therefore, pv experts from all over the world have been trying to develop suitable for home of inverter power supply, to promote the development of the industry better and faster.
Multi-series type
The application of multiple series inverters in electric vehicles has many advantages. The output voltage vector type of the series structure is greatly increased, which improves the control flexibility and control accuracy, and reduces the fluctuation of the voltage at the neutral point of the motor. The bypass characteristics of the inverter can improve the flexibility of charging and regenerative braking control.
"With citizens increasingly concerned about the urban environment, the development of electric vehicles is a rare opportunity," he said. In urban traffic, electric bus has become the priority for development because of its large load and high comprehensive benefit. Most electric buses use three-phase ac motors. Three-phase inverter needs to bear the effect of high voltage and current stress due to its large motor power. High dV/dt makes electromagnetic radiation serious and requires good heat dissipation.
The high-power inverter with multi-series structure reduces the voltage stress of a single device and reduces the requirement of the device. The value of dv/dt is reduced, the electromagnetic radiation is reduced, and the heating of the device is greatly reduced. As the output level is increased, the control performance is better.
Multiple series inverter is suitable for high power electric vehicle drive system. The multi-series structure can reduce the danger caused by multi-battery series, reduce the switching stress of the device and reduce the electromagnetic radiation. But the number of batteries needed has tripled.
The output voltage vector type of multiple series structure is greatly increased, the control flexibility and accuracy are improved, and the voltage fluctuation of the neutral point of the motor is reduced at the same time. In order to maintain the power balance of each battery group, it is necessary to ensure that the battery discharge time is consistent during operation. By bypass, you can flexibly charge the battery pack and also control the torque of regenerative braking.