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Phasor-based forced disturbance source locating method for generators

A technology for locating disturbance sources and generators, applied in the direction of reducing/preventing power oscillations, etc., can solve problems such as power oscillations and inability to judge

Active Publication Date: 2016-10-26
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the prior art can only determine the generator set where the disturbance source exists, but it is impossible to judge which specific control system in the generator causes the power oscillation caused by the disturbance

Method used

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  • Phasor-based forced disturbance source locating method for generators
  • Phasor-based forced disturbance source locating method for generators
  • Phasor-based forced disturbance source locating method for generators

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Embodiment Construction

[0046] The technical solution of the present invention will be further introduced below in combination with specific embodiments.

[0047] The specific implementation of the present invention will be described below by taking the positioning of the disturbance source of the forced oscillation in the four-machine two-zone system as an example. The wiring diagram of the system is as follows Figure 5 shown. Among them, the transfer function block diagram of the control system in the generator is as follows: figure 2 As shown, the transfer function of the governor is G GOV (s), the transfer function of the excitation system is G E (s) and the transfer function of the stable PSS of the power system is G pss (s), coefficient K 1 ~K 6 It is a constant related to the system structure, parameters, and operating conditions, and it is usually a positive value. in, The small disturbance stability analysis of the generator shows that the system contains an interval oscillation ...

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Abstract

The invention discloses a phasor-based forced disturbance source locating method for generators, comprising the following steps: S1) selecting a power generating set with power oscillation amplitude exceeding a threshold range according to a power system oscillation warning signal; S2) obtaining the real time measured data of the electrical power, the frequency or speed, the machine terminal current and the excitation current outputted from the selected power generating set; S3) preprocessing the real-time measured data and obtaining a dominant forced oscillation mode, and calculating the corresponding electric fluctuation quantity phasors in the dominant forced oscillation mode; and S4) locating the forced disturbance source for the generators according to the relationship between the corresponding electrical fluctuation quantity phasors of the generators and further determining the control system where the forced disturbance source is located. According to the invention, the method analyzes the relationship between the corresponding electrical fluctuation quantity phasors on two control channels, locates precisely the generator set where the forced disturbance source exists and judges whether the forced disturbance comes from a speed regulating system or an excitation system; this is of great significance to cut off a forced disturbance source quickly and effectively suppress forced oscillation.

Description

technical field [0001] The invention relates to the technical field of power system operation and control, in particular to a phasor-based generator forced disturbance source location method. Background technique [0002] In the situation of interconnection of power grids in large regions, while the reliability of the power grid is improved and resource allocation is optimized, the low-frequency oscillation problem has also become a key issue affecting the safe and stable operation of the power system. When the system is continuously disturbed periodically, when the frequency of the disturbance is close to or equal to the natural frequency of the system, it will cause a large power oscillation, which is the theory of forced power oscillation. The theory points out that the response caused by the forced disturbance is not only related to the characteristics of the power system itself, but also related to the change law of the disturbance. Forced oscillation has a clear sourc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
CPCH02J3/24
Inventor 蒋平郑斌青冯双
Owner SOUTHEAST UNIV
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