Frequency safety online monitoring and assessment method of power system

A technology for power system and safety assessment, applied in electrical components, circuit devices, AC network circuits, etc., to solve problems such as equipment damage

Active Publication Date: 2010-12-15
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] In addition, the frequency is too high

Method used

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  • Frequency safety online monitoring and assessment method of power system
  • Frequency safety online monitoring and assessment method of power system
  • Frequency safety online monitoring and assessment method of power system

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Embodiment Construction

[0071] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0072] For a given frequency-safe binary table [f cr , t cr ], f cr Indicates the requirement for the frequency offset amplitude, t cr Indicates the frequency deviation f cr The time requirements, both of which give the limit of the degree of frequency deviation from the rated value from the frequency and time levels, have the function of reference value.

[0073] t cr and (f N -f cr ) product characterizes the frequency by the rated value f N offset to f cr , lasted t cr The accumulation of can be used as a benchmark to construct the frequency safety margin index. Frequency response curve and f=f cr The straight line represented by the time window t cr The enclosing area within represents the distance between the frequency response curve and the safety limit from the frequency offset accumulation level, and the ratio of it to the reference ...

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Abstract

The invention relates to a frequency safety online monitoring and assessment method of a power system, which comprises the following steps: (1) setting a transient frequency safety binary table (fcr, fcr); (2) acquiring real-time frequency data of all monitoring points of the power system from an energy management system (EMS); (3) filtering the dynamic frequency data of all the monitoring points on the basis of a moving average method; (4) primarily analyzing the frequency data; (5) analyzing every group of dynamic frequency data, and calculating a frequency safety margin index according to the relationship between a frequency curve and the binary table (fcr, fcr) by the following three conditions: (1) tb = 0; (2) 0 < tb < tcr; and (3) tb > tcr, wherein tb is time that the frequency curve in an observation window deviates from fcr, and a frequency safety quantitative assessment method which takes frequency deviation cumulative effect is applied to the frequency safety margin calculation; and (6) comprehensively analyzing the frequency safety margin calculation results of all the monitoring points, taking the minimum margin value as a system frequency safety margin, and feeding back the system frequency safety margin to the energy management system for information display.

Description

technical field [0001] The invention relates to an on-line monitoring and evaluation method for frequency security of a power system. Background technique [0002] Frequency is one of the most important physical quantities of the power system, and keeping the frequency within the qualified range is an important task for the operation of the power system. In the transient process, due to the consideration of the turbine blades and unit shafting resonance, generator overexcitation, and safety of auxiliary equipment, it is necessary to ensure the safety of frequency deviation; Shifting may trigger chain trips and lead to system collapse; large-capacity access to wind power and other intermittent power sources requires safety checks such as frequency and voltage; optimization and setting of the third line of defense such as low-frequency load shedding requires frequency security quantitative margin information. [0003] The former Western System Reliability Committee (WSCC) of ...

Claims

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Application Information

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IPC IPC(8): H02J3/00G06Q50/00G06Q50/06
Inventor 张恒旭刘玉田
Owner SHANDONG UNIV
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