| As shown in the left figure below, some facilities
(loads) in the factory receive electric power from the electric power
company and the others from the in-plant electric power generator
at a time. When some facilities are stopped for some reason, for example,
maintenance, as shown in the right figure below, the factory has excess
electric power from the in-plant electric power generator. By changing
the switch connection, this excess electric power is supplied to the
facilities that were receiving the power from the electric company.
In such a case, bi-directional power flow occurs. See the flow direction
at the wattmeters. |
 |
In the future, if solar power generators or wind
power generators become common for residential use, surplus of electricity
generated by these generators may be fed to an electric company. Then,
the residential electric system will have bi-directional flow.
M-System provides power transmitter such as model LWT and model LTWT
whose output is in proportion to the forward power without being affected
by bi-directional power flow. |
|
What
is bi-directional power flow?
Bi-directional
power flow in an electric power supply system is power flow in two opposite
directions like tide. Bi-directional power flow occurs daily at factories
that consume electricity from the electric power company and from an in-plant
electric power generator, as well. 