CN100557915C - Serial compensation capacitance directional impedance protection method based on voltage compensation - Google Patents
Serial compensation capacitance directional impedance protection method based on voltage compensation Download PDFInfo
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- CN100557915C CN100557915C CN 200710098646 CN200710098646A CN100557915C CN 100557915 C CN100557915 C CN 100557915C CN 200710098646 CN200710098646 CN 200710098646 CN 200710098646 A CN200710098646 A CN 200710098646A CN 100557915 C CN100557915 C CN 100557915C
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Abstract
The present invention relates to the method for relaying protection in the field of power; a kind of memory direction impedance computation method by voltage compensation is disclosed; this method comprises the steps: that line protective devices carry out sampling filter to the voltage current waveform of instrument transformer, leaches the phase voltage U of protection installation place (M)
φ, phase current I
φ, voltage between phases U
φ φ, phase current difference I
φ φ, zero-sequence current 3I
0Utilize voltage, electric current, series compensation capacitance calculation of parameter to produce compensation memory voltage, the impedance of compensation memory direction, the influence of series capacitance to memory voltage removed in memory direction impedance through overcompensation, the problem that discriminating direction is made mistakes in the time of can effectively solving the line areas internal fault that contains serial compensation capacitance.When this method can prevent effectively that string from mending place transmission line generation internal fault; if the serial compensation capacitance capacitive reactance is during greater than the behind system impedance; adopt the direction component of memory voltage can judge by accident, cause protection tripping problem, can guarantee the safe and reliable operation of relaying protection in the other direction.
Description
Technical field
The present invention relates to field of power, relate more specifically to the method for relaying protection.
Background technology
Adopt series capacitor compensation technology can improve the ability to transmit electricity and the stability of a system of superhigh pressure long-distance transmission line, trend that can regulating system distributes.Adopt controlled series compensation also can suppress system's low frequency power oscillation and the distribution of optimization system trend, series capacitor compensation technology has obtained application more and more at China's extra high voltage network.But the series capacitor compensation equipment that increases in system has changed original electrical distance between the system; discriminating direction and impedance computation for distance protection have very big influence; may make discriminating direction conclusion mistake, may cause that distance protection surmounts, be worth scrutinizing.
Summary of the invention
When the serial compensation capacitance transmission line broke down, in some cases, the conventional direction of distance protection is differentiated can differentiate mistake.The object of the present invention is to provide a kind of memory direction impedance computation method, thereby improve the fail safe and the reliability of range direction element by voltage compensation.
Method of the present invention comprises the steps: that line protective devices carry out sampling filter to the voltage current waveform of instrument transformer, leaches the phase voltage of protection installation place
Phase current
Voltage between phases
Phase current is poor
Zero-sequence current
Utilize voltage, electric current, series compensation capacitance calculation of parameter to produce compensation memory voltage, the impedance of compensation memory direction, this memory direction impedance through overcompensation has been removed the influence of series capacitance to memory voltage, the problem that discriminating direction is made mistakes in the time of can effectively solving the line areas internal fault that contains serial compensation capacitance.When this method can prevent effectively that string from mending place transmission line generation internal fault; if the serial compensation capacitance capacitive reactance is during greater than the behind system impedance; adopt the direction component of memory voltage can judge by accident, cause protection tripping problem, can guarantee the safe and reliable operation of relaying protection in the other direction.
Description of drawings
Fig. 1 has shown the protection logic diagram that the present invention simplifies;
Fig. 2 has shown a typical serial compensation capacitance transmission line.
Embodiment
Current transformer TA and the voltage transformer TV instantaneous value that records electric current and voltage according to protection installation place (M place among Fig. 2); obtain the plural form of each electric parameters by fourier algorithm, can leach the zero-sequence current, voltage between phases, phase current difference etc. of protection installation place then by the filtering algorithm shown in the following formula:
In the formula:
Be respectively protection installation place (M place among Fig. 2) A, B, C phase voltage, phase current, zero-sequence current, the protection logic simplifying figure that shows according to Fig. 1 when string is mended input, uses to protect through the memory impedance of overcompensation and differentiates direction.When the string benefit does not drop into, then adopt traditional memory impedance to differentiate direction.
Describe the memory impedance of using through overcompensation below with reference to Fig. 2 and protect the principle of differentiating direction.
In typical serial compensation capacitance transmission line shown in Figure 2, the system impedance of M side is jX
s, the serial compensation capacitance impedance is-jX on the circuit
c, the system impedance of N side is jX
SNProtection for the M place.If X
s<X
c, when the forward fault takes place (K place among Fig. 2),, electric capacity do not puncture if, and the direction component of employing memory voltage will be judged by accident and is reverse direction failure, and impedance relay will tripping.
Adopt the direction impedance element of remembering through the phase voltage of voltage compensation can reliably differentiate fault direction.
Bucking voltage is:
Wherein
For
For
For
For
-jX
cBe the serial compensation capacitance impedance,
Zero sequence impedance penalty coefficient for transmission line.The memory directional impedance relay is:
Wherein
For remembering the direction impedance Z mutually
a, Z
b, Z
c,
Be alternate memory direction impedance Z
Ab, Z
Bc, Z
Ca
Memory voltage through voltage compensation has been equivalent to remove the influence of series capacitance to memory voltage.The directivity of its calculating is always correct.
Claims (1)
1. memory direction impedance computation method by voltage compensation, the method comprising the steps of:
Line protective devices carry out sampling filter to the voltage current waveform of instrument transformer, leach the phase voltage of protection installation place (M)
Phase current
Voltage between phases
Phase current is poor
Zero-sequence current
Utilize voltage, electric current, series compensation capacitance calculation of parameter to produce compensation memory voltage, the impedance of compensation memory direction,
Memory voltage after the compensation is:
Wherein the single-phase memory voltage after three single-phase compensation is
Wherein
Represent the memory voltage after the single-phase compensation after three compensation respectively, the alternate memory voltage after three alternate compensation is
Wherein
Represent respectively after three alternate compensation alternate memory voltage and
Wherein-j X
cBe the serial compensation capacitance impedance,
Zero sequence impedance penalty coefficient for transmission line;
The memory direction impedance of compensation is:
Priority Applications (1)
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CN 200710098646 CN100557915C (en) | 2007-04-24 | 2007-04-24 | Serial compensation capacitance directional impedance protection method based on voltage compensation |
Applications Claiming Priority (1)
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CN 200710098646 CN100557915C (en) | 2007-04-24 | 2007-04-24 | Serial compensation capacitance directional impedance protection method based on voltage compensation |
Publications (2)
Publication Number | Publication Date |
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CN101034802A CN101034802A (en) | 2007-09-12 |
CN100557915C true CN100557915C (en) | 2009-11-04 |
Family
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Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8675327B2 (en) * | 2007-03-30 | 2014-03-18 | General Electric Company | Fast impedance protection technique immune to dynamic errors of capacitive voltage transformers |
CN102570418B (en) * | 2011-12-20 | 2014-09-10 | 中国电力科学研究院 | Method and device for identifying current inverting of series compensated line |
CN102856890B (en) * | 2012-09-11 | 2015-05-13 | 中国电力科学研究院 | Adaptive current differential protection method applied to high-compensation-degree series compensation system |
CN106374442B (en) * | 2016-10-21 | 2018-12-21 | 南京南瑞继保电气有限公司 | A kind of accurate compensation method of distance protection for installing series devices route |
CN113872165B (en) * | 2021-10-27 | 2024-06-04 | 南方电网数字电网研究院有限公司 | Pilot protection method and device for serial compensation line, computer equipment and storage medium |
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2007
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Effective date of registration: 20171226 Address after: 100085 Beijing city on the base of the information industry on the street, No. four, No. 9, Haidian District Co-patentee after: Beijing Sifang Jibao Engineering Technology Co., Ltd. Patentee after: Beijing Sifang Jibao Automation Co., Ltd. Address before: 100085 Beijing city on the base of the information industry on the street, No. four, No. 9, Haidian District Patentee before: Beijing Sifang Jibao Automation Co., Ltd. |