A method for locating forced oscillation source of power grid based on wams and scada comprehensive data

Abstract

The invention provides a WAMS (wide area measurement system) and SCADA (supervisory control and data acquisition) integrated data based grid forced oscillation source positioning method. Oscillation sources are positioned rapidly and accurately by comprehensive utilization of data of the WAMS and SCADA. According to a main principle, the method includes: firstly, positioning general directions of the oscillation sources by adopting an energy flow function method based on 500kV grid WAMS data, then adopting different accurate oscillation source positioning methods according to properties of three common oscillation sources, computing tie lines of a local weak tie network by adopting an SCADA data based oscillation extreme point judgment method, and judging whether oscillation exists in the weak tie network or not; adopting WAMS data of generator excitation voltage phase to judge whether oscillation is caused by a generator excited system or not; adopting an extreme point computation method of SCADA data of valve or guide vane opening of a generator set to judge whether grid oscillation is caused by a unit prime mover or not.

Description

technical field [0001] The invention belongs to the field of dynamic monitoring of power systems, and in particular relates to a method for locating a forced oscillation source of a power grid based on comprehensive data from a wide area measurement system (ie WAMS) and a power data acquisition and monitoring system (ie SCADA). Background technique [0002] Most of the causes of power grid low-frequency oscillation are forced oscillation by an oscillation source. According to historical statistics, power oscillations in the Southern Power Grid are basically forced oscillations caused by oscillation sources, and the forced oscillation sources that cause grid oscillations are concentrated in the following three situations. From the situation of the Southern Power Grid, the power grid caused by these three situations Oscillation accounts for over 90% of: [0003] 1. Because the frequency of the disturbance of the weakly connected regional grid is close to the frequency of a ce...

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Problems solved by technology

[0003] 1. Because the frequency of the disturbance of the weakly connected regional power grid is close to the frequency of a certain oscillation characteristic of the main network, it causes the main network to oscillate

[0004] 2. Due to the adjustment problem of the generator set, the active power output by the prime mover periodically oscillates, and its frequency is close to the characteristic frequency of the power grid, causing the main grid to oscillate

[0005] 3. Due to the problem of the excitation regulator of the generator, positive feedback occurs, causing the main network to oscillate

Although the principle is correct, because the power grid has very limited stations with PMU devices, if the oscillation source station does not have a PMU device, it cannot be positioned correctly. If the oscillation source station does not have a PMU, it can only roughly determine the direction of the oscillation source, so it is practical little value

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