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System damping online monitoring method based on capacitor switching response

A capacitor switching, capacitor technology, applied in the direction of instruments, measuring electricity, measuring devices, etc., can solve problems such as power impact

Inactive Publication Date: 2017-02-01
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the reactive power disturbance caused by capacitor switching is a long-term and relatively fixed power impact in the actual power grid.

Method used

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  • System damping online monitoring method based on capacitor switching response
  • System damping online monitoring method based on capacitor switching response
  • System damping online monitoring method based on capacitor switching response

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Embodiment Construction

[0035] In order to better understand the technical content of the present invention, specific embodiments are given together with the attached drawings for description as follows.

[0036] Aspects of the invention are described in this disclosure with reference to the accompanying drawings, which show a number of illustrated embodiments. Embodiments of the present disclosure are not necessarily intended to include all aspects of the invention. It should be appreciated that the various concepts and embodiments described above, as well as those described in more detail below, can be implemented in any of numerous ways, since the concepts and embodiments disclosed herein are not limited to any implementation. In addition, some aspects of the present disclosure may be used alone or in any suitable combination with other aspects of the present disclosure.

[0037]In the actual power grid operation, there are a large number of substation capacitor switching disturbances, which mea...

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Abstract

The invention provides a system damping online monitoring method based on a capacitor switching response, which comprises steps: 1, actual main inter-area oscillation modes of a power grid and unit information strongly related to each mode are acquired; 2, according to the geographical distribution of main capacitors and key units in the power grid and the power grid inter-area oscillation mode area division, a unit which has a close electrical distance with a switching capacitor and is from units strongly related to the main inter-area modes is selected as a monitoring node; 3, based on dynamic measurement of the monitoring node, as for a unit whose oscillation response can be obviously observed under the capacitor switching impact, a Prony method is adopted to online recognize the system inter-area oscillation frequency and damping ratio information; 4, as for a unit whose oscillation can not be obviously observed under the capacitor switching impact, an ARMA method is adopted to analyze unit active power noise signals to acquire the real-time oscillation frequency and damping information; and 5, in response to a case when the system real-time mode damping ratio is lower than a given threshold, warning information is sent in different grades.

Description

technical field [0001] The invention relates to the field of on-line monitoring and pre-warning and pre-control of low-frequency oscillations in electric power systems, in particular to an on-line monitoring method and system for system damping based on capacitor switching responses. Background technique [0002] With the continuous expansion of the scale of the interconnected grid, the low-frequency oscillation of the power system has greatly restricted the transmission capacity of the grid, and has become a prominent problem affecting the security and stability of the interconnected grid. System damping is a key factor in determining whether low-frequency oscillations occur or not, and how large the oscillations are. Current power system operators often obtain the dynamic characteristics of the system, especially the oscillation frequency and damping ratio information, by performing modal analysis calculations on future off-line or real-time power flow sections. Because t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 黄晓明楼伯良陆承宇黄弘扬孙维真陈新琪魏路平卢嘉华吴跨宇赵一琰华文卢岑岑邓晖熊鸿韬张静鞠平余一平金宇清沈赋王成庆刘世凯彭琰沈亚玲孙卫娟
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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