Control Interface Power Based On Power Flow Tracing And Generator Re-Dispatching

Security and stability is essential for power system operation. Operators usuallysupervise the power flow on some critical interfaces in order to guarantee the systemstability. So, it is significant to find effective method to control power flow on somecritical interfaces not only for system optimal operating under monopoly but also forcongestion mitigation under deregulation. In this thesis, after recalling some relevanttheories, such as power flow tracing, congestion management, power system stability,a power transmission control strategy based on power flow tracing and generator redispatchingis presented.Firstly, power system is separated into receiving-end sub-system and sending-endsub-system based on the transmission on the interface.Secondly, power flow on the interface is traced backward to the sending-end tolocate the generators to be adjusted. And then, the power flow is traced forward todetermine the loads to be affected in the receiving-end. Power flow tracing is adoptedagain from such loads to determine their supplying generators in the receiving-endsub-system, which is then used to compensate the load fluctuation according to thetransmission changing of the interface. There is not any impact on customer loadsafter control strategy.Finally, the presented method is applied to the New England-39 bus system,IEEE-57 bus system and IEEE-118 bus system. Based on the case studies, it can befound that the approach can control the transmission on the interface in a relative largerange with little error. Moreover, the re-dispatching generators are very few, and thecontrol targets are approximately proportional to the adjustment. Such features arevery useful for the online application. Since power flow tracing is a common-usedmethod in loss allocation and node pricing under power market, the presented methodcan be used both in monopoly and deregulation environment.