Subsynchronous oscillation disturbance source positioning method based on energy flow power
A technology of subsynchronous oscillation and disturbance source location, which is applied in the direction of measuring devices, instruments, and measuring electronics. It can solve problems such as torsional vibration of thermal power unit shafting, affecting system power quality, and shafting damage, and achieves simple calculations and reduced stability. Risk, loss reduction effect
Pending Publication Date: 2021-12-31
NR ELECTRIC CO LTD +1
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Problems solved by technology
In the past, new energy grid connection mainly focused on high-order harmonics (integer multiples of 50Hz). A large number of hardware filters were used to improve the harmonic characteristics of equipment for high-order harmonics. lack of attention to harmonics, and failed to take effective governance measures
[0005] In addition to affecting the power quality of the system, sub-synchronous harmonics may also affect the safe operation of thermal power units
The shafting of large thermal power units has a natural torsional vibration frequency in the range of 10Hz to 40Hz. If the harmonic frequency of the system coincides with the shafting frequency of the unit (50Hz is complementary), it will cause torsional vibration of the shafting of the thermal power unit, resulting in damage to the shafting and serious damage. Safe and stable operation of the system
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[0048] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0049] Such as figure 1 Shown is the general flowchart of the present invention, comprises steps as follows:
[0050]Step 1, collect the instantaneous values of active power and frequency of electrical components such as lines, transformers, power supplies, etc., first perform spectrum analysis on the active power; judge whether subsynchronous oscillation occurs according to the results of spectrum analysis, the implementation method is as follows:
[0051] By performing spectrum analysis on the instantaneous value of the active power within the time period t~t+Δt, the corresponding DC component and n oscillation components with attenuation coefficient Z are obtained p (i) (i=1, 2, ..., n;), the oscillation component Z p (i) is a cosine function with decay to time t:
[0052]
[0053] In formula (1):
[0054] Z p (i) is the ...
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The invention discloses a subsynchronous oscillation disturbance source positioning method based on energy flow power, which comprises the following steps of: performing spectrum analysis through active power and frequency instantaneous value of an electrical element, judging whether subsynchronous oscillation occurs according to a spectrum analysis result, and searching a dominant oscillation mode in combination with energy proportion sorting; and obtaining a subsynchronous oscillation energy flow direction by using an energy flow power calculation formula, so as to judge the position of a subsynchronous oscillation disturbance source. The method can guide event processing after the subsynchronous oscillation occurs, reduces the loss caused by the subsynchronous oscillation, is simple in operation, and facilitates the practical engineering application.
Description
technical field [0001] The invention relates to a method for locating a subsynchronous oscillation disturbance source, in particular to a method for locating a subsynchronous oscillation disturbance source based on energy flow power. Background technique [0002] Scholars at home and abroad have recognized the subsynchronous oscillation phenomenon caused by the interaction between thermal power units and series compensation since the 1970s. Since then, researchers have continued to study such problems based on some practical engineering phenomena. In the early stage, they mainly focused on the oscillation induced by the torsional vibration of the shafting of the thermal power unit, and then transferred to the oscillation caused by the wind power controller, and then transitioned to the soft Oscillations caused by the fast response of power electronics in DC-DC converters and their interactions with other devices. Recently, with the development of new energy power generation...
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Login to View More IPC IPC(8): G01R23/16G01R31/00
CPCG01R23/16G01R31/00
Inventor 高玉喜马志恒刘子俊刘伟航葛景王新宝祝万付俊波韩连山方胜文刘永刚
Owner NR ELECTRIC CO LTD