Power transfer solving method under grid failure state

Abstract

The invention relates to a power transfer solving method under a grid failure state, aiming at a grid provided with a wide area measurement system (WAMS). An overlay principle is utilized, and the network state in normal operation is overlaid with the state of a single-power failure additional network only under the action of failure power supply so as to obtain network power distribution after a failure circuit is removed and further solve for a power transfer amount on a non-failure circuit. A great deal of simulation test results show that the method can accurately solve for the power transfer amount under the grid failure state and solve the key technical problems that non-convergence easily occurs and solving can not achieved in the traditional tide solving. The power transfer solving method under the grid failure state can effectively solve the power amount transferred to the non-failure circuit after failure occurs to a transmission line, and is still effective even under the condition that network tide can not be converged after the failure.

Description

technical field [0001] The invention belongs to the field of electric power systems, and in particular relates to a power transfer solution method in a grid fault state. Background technique [0002] The structure and operation of modern power systems are increasingly complex and volatile, increasing the chances of systemic failures and widespread blackouts. When a transmission line fails and goes out of operation, since the system power output will not change in a short period of time, the power originally carried on the faulty line must be transferred to other lines in the network. If the power diverted to a normal line is such that the actual power on that line exceeds its rated transmission capacity, it may cause that line to also be taken out of service, potentially causing a more severe cascading failure. [0003] In this case, if the power transferred to other lines after the line is cut off can be known before the faulty line is out of service, corresponding measure...

AI Technical Summary

Problems solved by technology

For example, the power flow calculation method and other power flow calculation programs given in the domestic literature "Research and Application of Type-Extended Power Flow Calculation" ("Power Grid Technology", Volume 27, No. 11, Page 25, 2003), no matter which method is used, they are all It is based on making the power flow diverge into convergence, and the amount of transferred power can only be known after the power flow solution is restored, so it has a certain hysteresis and cannot be applied to the real-time power transfer solution under the grid fault state

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