Which inverters can be divided into power levels?

Update:2021-01-18
Abstract:

Divided into high-power inverter, medium-power inverter […]

Divided into high-power inverter, medium-power inverter, low-power inverter.
Common type
1. Small and medium power
Small and medium power inverter power supply is one of the important links in the household independent AC photovoltaic system. Its reliability and efficiency are vital to the promotion of photovoltaic systems, effective energy use, and reduction of system costs. Therefore, photovoltaic experts in various countries have been working hard to develop An inverter power supply suitable for household use to promote better and faster development of the industry.
2. Multiple series
Multiple series inverters have many advantages when applied to electric vehicles. The type of output voltage vector of the series structure is greatly increased, which enhances the flexibility of control and improves the accuracy of control; at the same time, it reduces the fluctuation of the neutral point voltage of the motor. The bypass feature of the inverter can improve the flexibility of charging and regenerative braking control.
As people are increasingly concerned about the urban environment, the development of electric vehicles has a rare opportunity. In urban transportation, electric buses have become a priority for development due to their large capacity and high comprehensive benefits. Electric buses mostly use three-phase AC motors. Due to the high power of the motors, the components in the three-phase inverters need to withstand high voltage and high current stress. Higher dv/dt makes electromagnetic radiation serious and requires good Heat dissipation.
The high-power inverter with multiple series structure reduces the voltage stress of a single device and reduces the requirements for the device; reduces the dv/dt value, reduces electromagnetic radiation, and greatly reduces the heating of the device; due to the output Increased level types and better control performance.
Multiple series inverters are suitable for high-power electric vehicle drive systems. The use of multiple series-connected structures can reduce the risk of multiple batteries in series, reduce the switching stress of the device and reduce electromagnetic radiation. But the number of batteries required has increased by a factor of 2.
The multiple series structure output voltage vector types have been greatly increased, thereby enhancing the flexibility of control and improving the accuracy of control; at the same time, it reduces the fluctuation of the neutral point voltage of the motor. In order to maintain the balance of the power of each battery, it is necessary to ensure that the battery discharge time is consistent during operation. Through the bypass mode, the battery pack can be charged flexibly, and the regenerative braking torque can also be controlled.

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