A power transaction specifies a way in which the system load and/or generation changes according to a set of rules. In our software, a power transaction is specified using the source/sink concept, and flexible load/generation scaling and scheduling options are provided to define dispatches for the source/sink.
The power transfer limits determined can be subject to any or all of the following security criteria:
， Thermal overload
， Steady-state voltage violations
， Transient voltage violations
， Transient frequency violations
， Voltage stability margin
， Active and reactive power reserve