Active inverter and grid-connected output current flow and waveform

乱世煮酒论天下

Active inverter and grid-connected output current flow and waveform [Copy link]

In the process of active inversion, energy can flow in the reverse direction, from the motor to the grid. When the motor slows down, the bus voltage increases. However, in order to realize the flow of energy, the voltage on the power generation side must be higher than the voltage on the grid. In active inversion, the bus voltage is greater than the voltage on the grid side, and the direction is always positive at the top and negative at the bottom. So what is the interval for transmitting energy to the grid at this time? At which start-up stage of the inverter is the power sent out?
From this, it can be inferred that the motor is connected to the grid. The phase of the voltage sent out is consistent with the phase of the grid voltage. So is the current directly sent to the grid? What is the current waveform on the grid? The speed of the current is the speed of the electric field establishment, which is an order of magnitude of the speed of light. So the speed of the current transmission should be very fast at this time, so why do we still need to prevent the grid voltage from dropping due to large power consumption?

maychang

It is recommended to first find out when ordinary AC power sources can be operated in parallel, for example, when two AC generators can be operated in parallel. Then study when the inverter can be connected in parallel with the AC grid to deliver energy to the grid.

qwqwqw2088

This should be a problem with the active inverter working state of the three-phase bridge rectifier circuit. If the AC side of the inverter circuit is connected to the AC grid, the DC power is inverted into AC power of the same frequency and then sent back to the grid, it is active inverter.

"The direction is always positive at the top and negative at the bottom, so what is the interval for transmitting energy to the grid at this time? At which stage of the inverter is the power delivered?"

This requires looking at the waveform.