A method and device for online risk assessment of subsynchronous oscillation based on frequency domain impedance
A subsynchronous oscillation, frequency domain impedance technology, applied in circuit devices, wind power generation, system integration technology, etc., can solve the problem of no online practical application, and achieve the effect of quantitative evaluation
Active Publication Date: 2022-08-09
NARI TECH CO LTD +4
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Problems solved by technology
Among them, the impedance analysis method establishes the small-signal frequency-domain impedance model of the power electronic device, and uses the popularized Nyquist criterion or aggregate impedance frequency characteristics to judge the system stability. It is a theoretical method that scholars at home and abroad have focused on in recent years. It is more suitable for online computing requirements than other methods, but there is no online practical application yet
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[0054] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, and cannot be used to limit the protection scope of the present invention.
[0055] like figure 1 As shown, the present invention provides an online assessment method for subsynchronous oscillation risk based on frequency domain impedance analysis, comprising the following steps:
[0056] Step 1: Screen potential subsynchronous oscillation modes and key plants based on the measured inter-harmonic signal amplitude-frequency characteristic quantities of each synchrophasor measurement unit (PMU) or subsynchronous monitoring device in the power grid.
[0057] The screening methods for potential subsynchronous oscillation modes and key plants are as follows:
[0058] If the measured inter-harmonic signals of each PMU or sub-synchronous monitoring device of the p...
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The invention discloses an on-line assessment method and device for subsynchronous oscillation risk based on frequency domain impedance. The method comprises the following steps: screening potential subsynchronous oscillation modes and key plants and stations based on measured amplitude-frequency characteristic quantities of inter-harmonic signals; real-time operation based on power grids The subsynchronous admittance of each branch corresponding to the frequency of the potential subsynchronous oscillation mode is generated on the basis of the equipment frequency domain impedance modeling. The equivalent impedance is aggregated on the source side and the grid side, and the potential subsynchronous oscillation mode resonance and damping margin are calculated based on the aggregated equivalent impedance at the driving point. The invention can meet the requirements of the quantitative assessment of the next synchronous oscillation risk and the on-line safety early warning of the current operation mode of the power grid.
Description
technical field [0001] The invention relates to an on-line assessment method for subsynchronous oscillation risk based on frequency domain impedance, and belongs to the technical field of power system automation. Background technique [0002] With the continuous and rapid development of converter-based wind / photovoltaic power sources, UHV DC and flexible AC and DC power transmission equipment and microgrids, profound changes are taking place in the power system from the power supply side, the grid side to the user side: Features of Power Electronics It is further highlighted that the coupling of power electronic equipment such as DC and FACTS with the traditional AC power grid is strengthened, which leads to the introduction of a large number of non-integer power frequency inter-harmonics into the power grid, which makes the problem of the power grid change from the original fundamental frequency to broadband, new Different forms of oscillation problems such as energy-therma...
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IPC IPC(8): H02J3/00
CPCH02J3/00H02J3/002H02J2203/20Y04S10/22
Inventor 鲍颜红张金龙杜延菱徐泰山张隽任先成刘海涛刘韶峰孙为民吴峰邢晶杨君军周博陈颖杰
Owner NARI TECH CO LTD