Method and device for determining low-frequency oscillation suppression effect of power system stabilizer
A power system, low-frequency oscillation technology, applied in circuit devices, reducing/preventing power oscillations, instruments, etc., can solve problems such as inaccurate evaluation results, and achieve the effect of suppressing local mode oscillations
Active Publication Date: 2018-01-02
NORTH CHINA ELECTRICAL POWER RES INST +1
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[0007] The embodiment of the present invention provides a method for determining the low-frequency oscillation suppression effect of a power system stabilizer, so as to solve the technical problem of inaccurate evaluation results of the low-frequency oscillation suppression effect of the power system stabilizer in the prior art
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[0048] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the embodiments and accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.
[0049] In an embodiment of the present invention, a method for determining the effect of a power system stabilizer on suppressing low-frequency oscillations is provided, such as figure 1 As shown, the method includes:
[0050] Step 101: When the power angle of the generator where the power system stabilizer is located remains constant, obtain the frequency response characteristic curve from the excitation reference voltage to the electromagnetic torque of the generator;
[0051] Step 102: Calculate the sensitivity of the unstable eigenvalues to the gain of the power system stabilizer;
[00...
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Embodiments of the invention provide a method and an apparatus for determining a low-frequency oscillation suppression effect of a power system stabilizer. The method comprises: under the condition of keeping a constant power angle of a power generator in which the power system stabilizer is located, obtaining a frequency response characteristic curve from an excitation reference voltage to electromagnetic torque of the power generator; calculating the sensitivity of an instable eigenvalue with respect to the gain of the power system stabilizer; setting parameters of the power system stabilizer according to the frequency response characteristic curve or the sensitivity; and performing simulation by utilizing the set parameters of the power system stabilizer to obtain a closed-loop eigenvalue of a power system. According to the scheme, the set parameters of the power system stabilizer can suppress specified-mode oscillation in a maximized way; and the closed-loop eigenvalue obtained by performing the simulation based on the set parameters of the power system stabilizer can accurately and effectively reflect the low-frequency oscillation suppression effect of the set parameters of the power system stabilizer in the power system.
Description
technical field [0001] The invention relates to the technical field of power grid security, in particular to a method and a device for determining the effect of a power system stabilizer for suppressing low-frequency oscillations. Background technique [0002] With the continuous development of modern power systems, power system stabilizers are widely used to suppress low-frequency oscillations and improve system dynamic stability. As early as the 1960s, power system stabilizers were first applied to hydroelectric generators. By 2000, a new multi-band power system stabilizer PSS4B was proposed, which can suppress low-frequency oscillations more flexibly and powerfully. [0003] However, the power system stabilizer's ability to suppress low-frequency oscillations not only depends on its structure, but also is inseparable from its parameter setting. Ideally, the parameters of the power system stabilizer should be such that the damping of the specified eigenvalue is maximized...
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IPC IPC(8): H02J3/24G06F17/50
CPCH02J3/24H02J2203/20Y02E60/00
Inventor 吴涛谢欢苏为民罗婧赵峰梁浩刘军娜刘珅史扬徐正龙姚谦赵焱付宏伟王非郝婧陈瑞夏雪徐鹏姜博梁伟宸马志昊
Owner NORTH CHINA ELECTRICAL POWER RES INST