A test method and device for the ability of a power system stabilizer to suppress low-frequency oscillations
A power system and low-frequency oscillation technology, applied in the field of power electronics, can solve problems such as inaccurate test results, affecting test efficiency, and time-consuming
Active Publication Date: 2021-06-08
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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Problems solved by technology
Although this method of changing the moment of inertia of the unit can easily adjust the oscillation frequency, it is necessary to re-adjust the relevant parameters of the power system stabilizer PSS after changing the moment of inertia of the unit each time. It takes time and affects the test efficiency. On the other hand, unauthorized modification of the PSS parameters of the power system stabilizer may cause abnormal output of the PSS of the power system stabilizer, resulting in inaccurate test results, and cannot effectively prove the oscillation suppression performance of the PSS of the power system stabilizer under test.
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[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0039] see figure 1 , which is a schematic structural diagram of a simulation test platform for a test method for the ability of a power system stabilizer to suppress low-frequency oscillations provided by an embodiment of the present invention. The simulation test platform includes:
[0040] A single-machine infinite system model and an actual excitation control device; the single-machine infinite system model includes a generator under test, a transmission line a...
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The invention discloses a method and device for testing the ability of a power system stabilizer to suppress low-frequency oscillations. According to the linear relationship between the power transmission line in the power system and the oscillation frequency generated by the generator under test, the method measures the length of the power transmission line Adjust several times, and calculate the corresponding oscillation frequency and the damping ratio of the power system during the low-frequency oscillation period of the transmission lines of different lengths. The corresponding damping ratio under the state is compared and analyzed to determine the effect of the power system stabilizer's ability to suppress low-frequency oscillations. This method can simulate each frequency point in the test frequency band by adjusting the transmission line in the power system without changing any parameters of the generator and the supporting power system stabilizer PSS, and effectively suppresses the PSS of the power system stabilizer under test. The ability of low-frequency oscillation can obtain real and credible test results and improve test efficiency.
Description
technical field [0001] The invention relates to the technical field of power electronics, in particular to a test method for the ability of a power system stabilizer to suppress low-frequency oscillations. Background technique [0002] With the continuous expansion of the scale of the power grid and the increasingly complex structure (interconnection of AC and DC lines, and the increase of long-distance power transmission lines), low-frequency oscillation events of 0.2-2.5 Hz in the power system occur from time to time, and low-frequency oscillations will affect the voltage and frequency of the power system. In severe cases, it will cause out-of-synchronization of grid-connected units, which is one of the key issues that threaten the safe and stable operation of the power system. Power system stabilizer PSS is currently the most mature and effective means of suppressing low-frequency oscillations, and is widely used in all levels of power grids. Its principle is to increase ...
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IPC IPC(8): G01R31/00
Inventor 顾浩瀚袁艺李书勇
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD