Power system control

Abstract

The present invention relates to a method of controlling power flows and / or voltages in a power system. The method comprises monitoring conditions of voltage and / or current at a set of system locations for a scanning cycle of synchronised measurements. The scanning cycle comprises a series of time steps in which instantaneous sample measurements of voltage and / or current are taken. The monitoring provides data comprising the instantaneous sample measurements for a complete scanning cycle. A transient state estimation is determined based on the data for two or more sequential time steps. The transient state estimation includes an estimation of a non-sinusoidal voltage or current waveform caused by a disturbance to the power system. The method further includes forming a snapshot that includes instantaneous voltages, current flows and power flows of the power system. The method further includes making an adjustment to mitigate the effect of the disturbance. The invention also resides in a power system comprising a plurality of synchronised measurement units at locations in the power system. Each measurement unit is configured to obtain sample data over a synchronised scanning cycle comprising a series of time steps in which instantaneous sample measurements of voltages and / or currents are taken, and to transmit the instantaneous sample data for a complete scanning cycle after completion of the cycle. A transient state estimator is configured to receive and analyse the sample data to determine a transient state estimation based on the data for two or more sequential time steps. The transient state estimation includes an estimation of a non-sinusoidal voltage or current waveform caused by a disturbance to the power system. At least one power device adjusts an amount of power supplied to and / or drawn from the power system to mitigate the effect of the disturbance.

Description

technical field [0001] The present invention relates to a device, method and computer program for monitoring and control of a power system. More specifically, the present invention relates to controlling power flow and voltage in a power system in the event of system disturbances. Background technique [0002] A power system or grid typically includes multiple power buses interconnected by transmission lines. figure 1 An example of an IEEE14-bus system 10 is shown, in which the buses Bus1 , Bus2 , . . . , Bus14 are interconnected by transmission lines 12 . Generators G provide power to some buses (such as Bus1 and Bus2), while loads L draw power from some buses. In addition, some buses have synchronous condensers C for generating or absorbing the energy needed to regulate the voltage or improve the power factor in the grid. In addition, if figure 1 As shown in , some transmission lines 12 may include a transformer T for stepping down or boosting the voltage between the b...

AI Technical Summary

Problems solved by technology

The problem with this approach is that it places unacceptable demands on the performance of the measuring instrument and the speed of data communication

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