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Frequency safety online monitoring and assessment method of power system

A power system and security technology, applied in the field of online monitoring and evaluation of power system frequency security, can solve problems such as equipment damage

Active Publication Date: 2012-11-07
SHANDONG UNIV
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Problems solved by technology

[0015] In addition, the frequency is too high and too low will cause damage to the equipment

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 drawings and embodiments.

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

[0073] t cr And (f N -f cr ) Represents the frequency from the rated value f N Offset to f cr , Duration t cr The accumulation can be used as a benchmark to construct frequency safety margin indicators. Frequency response curve and f=f cr The represented line is in the time window t cr The enclosed area inside represents the distance between the frequency response curve and the safety limit from the frequency offset accumulation level, and its ratio to the reference value can be used as a standard safety margin...

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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 pointson 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 online monitoring and evaluation method for frequency safety 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 turbine blade and unit shaft resonance, generator overexcitation, and auxiliary equipment safety, it is necessary to ensure the safety of frequency deviation; if the unit and system protection parameters are not adjusted properly, the frequency deviation will be large. Intermittent power sources such as wind power and other intermittent power sources require safety checks such as frequency and voltage; the third line of defense such as low-frequency load shedding requires frequency safety quantitative margin information. [0003] The former US Western System Reliability Council (W...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00G06Q50/06
Inventor 张恒旭刘玉田
Owner SHANDONG UNIV
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