When multiple inverters are used in the common DC bus, because the DC bus between the inverters is connected together, the bus energy between the inverter in the power generation operation state and the inverter in the electric operation state can flow to each other, so that the voltage of the common bus is relatively stable, and the external energy consumption braking unit is not required when the system configuration is reasonable, so as to achieve the purpose of saving energy and reducing the cost of the system.
1 Applicable occasions of common bus scheme
Not all inverters are suitable for connecting the bus voltages together for common bus use, and only the electrical drive system composed of inverters with frequent alternating operation conditions of electric and power generation of the load motor driven by the drive should consider the use of common bus.
2 Precautions for the use of common bus
For the common DC bus system of multiple inverters, especially the common DC bus of inverters of different power levels, it is very important that the connection between the bus bars is protected by fuses. When the power equipment of one of the inverters in the common bus is damaged by short circuit breakdown, all the energy of the other inverter bus bars is discharged through the damaged inverter, which may exceed the current treatment ability of a single inverter, resulting in safety accidents. The separation of the series fuse in the positive and negative bus can effectively prevent the further expansion of the problem and ensure the safety of the common bus. The additional voltage of the fuse should be selected above 700VDC, and the additional current of the fuse is determined according to the additional output current of the connected inverter, and the additional current of the fuse is generally more than 2 times of the additional output current of the inverter.
For the common DC bus system of multiple inverters, especially the common DC bus of inverters of different power levels, it is very important that the connection between the bus bars is controlled by the contactor. When a certain inverter needs to be cut into the common bus system, in order not to affect the normal operation of other inverters of the common DC bus, it is necessary to consider the control sequence of the inverter bus connection and select the appropriate opportunity to connect the inverter to the common DC bus system. When a frequency converter in the common DC bus system is replaced, overhauled or damaged due to demand, it is necessary to consider how to disconnect a single frequency converter from the common bus system in order not to affect the normal operation of other frequency converters in the common DC bus system.
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