CN104849541A - Method for realizing voltage measurement abnormity detection in direct-current protection system - Google Patents
Method for realizing voltage measurement abnormity detection in direct-current protection system Download PDFInfo
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Abstract
The invention provides a method for realizing voltage measurement abnormity detection in a direct-current protection system. The method comprises the following steps that: A, an absolute value of a difference value of direct-current voltages UdH of a primary measurement system and a standby measurement system in the direct-current protection system is calculated; B, a corresponding threshold value is selected according to enabling states of two valve group trigger pulses of one pole of the direct-current protection system; C, when the absolute value of the difference value of direct-current voltages UdH is higher than the threshold value, a first criterion is generated; D, when any valve group trigger pulse is enabled, a second criterion is generated; E, when no fault occurs at two sets of measurement systems, a third criterion is generated; and F, logic and operation are carried out on the first criterion, the second criterion, and the third criterion to obtain a direct-current voltage measurement abnormity detection result. According to the invention, direct-current voltage measurement abnormity detection can be realized in the direct-current protection system; the hidden danger can be found timely; a basis can be provided for decision making for the operator; and a direct-current latching event caused by the voltage measurement degree increase can be avoided.
Description
Technical field
The present invention relates to electric system high-voltage dc transmission electrical domain, particularly relate to a kind of method realizing voltage measurement abnormality detection at DC protection system.
Background technology
In some extra-high voltage direct-current transmission engineering, a pole is in series by two valve groups.Single valve group is carried out operation by valve set control system and is controlled, and valve unit protection system this valve group of can stopping transport after valve group breaks down situation avoids the expansion of fault coverage; Each pole is carried out operation by polar control system and is controlled, and the expansion of fault coverage is avoided in protection system this pole of can stopping transport after situation is broken down in pole in pole.Pole control, pole protection, valve group control and the normal operation of valve unit protection all depends on measuring system the critical quantity of pole, valve group is transferred to said system.For ensureing the reliability measured, DC voltage measurement is transferred in the control of direct current pole, pole protection, the control of valve group and valve unit protection respectively by multiple Measurement channel.But the judgement of current single-measurement channel DC voltage measurement exception only can depend on the observation of operations staff, and its efficiency is low, poor reliability.
Particularly, in direct current protecting program, measuring system before protection exit, can be asked to switch, avoid the abnormal false protection caused of single cover measuring system; In order to avoid switching to the measuring system for subsequent use of fault, the DC voltage UdH equivalent choosing measuring system for subsequent use in defence program carries out measurement validity check, if its value overrun, then judges measuring system fault for subsequent use, forbids that measuring system switches; And in defence program, the scope of measuring system measured value for subsequent use validity check is comparatively large, and this inspection can only reflect measurement fault, can not reflect DC voltage measurement anomalous event.Such as, within 2015, certain DC transmission engineering there occurs repeatedly voltage measurement anomalous event, to have changed altogether in measuring system 7 pieces measure point pressing plates after just recover normal, it detects and time spent by maintenance, energy are huge.
Summary of the invention
The object of the invention is to propose a kind of method realizing voltage measurement abnormality detection at DC protection system, to reflect the hidden danger of DC voltage measurement exception early.
In order to solve the problems of the technologies described above, technical scheme of the present invention is as follows:
Realize a method for voltage measurement abnormality detection at DC protection system, comprise the following steps:
A, ask for the absolute value of the difference of the DC voltage UdH of main measuring system and measuring system for subsequent use in DC protection system;
B, set the amplitude of measuring system within the scope of nominal error as numerical value K, the maximum nominal error value that then two measured values subtract each other is 2K, if two valve group trigger pulses of a pole are all in enabled state in DC protection system, select corresponding threshold value to be 2K, otherwise select threshold value to be K;
C, the absolute value of described DC voltage UdH difference and described threshold value to be compared, when the absolute value of DC voltage UdH difference is higher than threshold value, generate the first criterion;
D, judge two valve group trigger pulse enabled state of a pole in DC protection system, when any one valve group trigger pulse is enable, produce Second Criterion;
E, judge the malfunction of described main measuring system and measuring system for subsequent use, when the two equal non-fault of cover measuring system, form the 3rd criterion;
F, described first criterion, Second Criterion, the 3rd criterion are made logic and operation, draw DC voltage measurement abnormality detection result.
The present invention can realize DC voltage measurement abnormality detection in DC protection system; ensure that existing DC engineering occurs extremely at voltage measuring value; automatically the criterion of electric voltage exception is realized by the logical program in DC protection system; and produce corresponding event and trigger fault record ripple to operating maintenance personnel; the abnormal hidden danger of energy Timeliness coverage voltage measurement; there is provided foundation for operations staff makes a policy, avoid voltage measurement degree to strengthen the direct current lockout state caused.
Compared with conventional art, the beneficial effect that the present invention brings has:
1, in high voltage direct current transmission project, if the DC voltage UdH magnitude of voltage of single cover measuring system occurs extremely, automatically the criterion of electric voltage exception can be realized, and produce corresponding logout and failure wave-recording, electric voltage exception degree is understood, for operating maintenance person works decision-making provides foundation for operating maintenance personnel;
2, in the situation such as, measuring system fault enable at valveless group trigger pulse, blocking voltage abnormal detection function, has effectively ensured the reliability of measuring ability;
3, need not change increase hardware configuration, engineering availability is strong;
4, consider an operating mode that pole single valve group is run and bivalve group is run, different threshold values can be selected according to different operating conditions, make judged result more accurately, reliably.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the embodiment of the present invention.
Embodiment
For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, and below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Embodiment
As shown in Figure 1, a kind of method realizing voltage measurement abnormality detection at DC protection system, comprises the following steps:
A, ask for the absolute value of the difference of the DC voltage UdH of main measuring system and measuring system for subsequent use in DC protection system;
Measuring system nominal error scope ± 0.002 of B, at present certain engineering, the maximum nominal error value that then two measured values subtract each other is 0.004, if two valve group trigger pulses of a pole are all in enabled state in DC protection system, select corresponding threshold value to be 0.004, otherwise select threshold value to be 0.002;
C, the absolute value of described DC voltage UdH difference and described threshold value to be compared, when the absolute value of DC voltage UdH difference is higher than threshold value, generate the first criterion;
D, judge two valve group trigger pulse enabled state of a pole in DC protection system, when any one valve group trigger pulse is enable, produce Second Criterion;
E, judge the malfunction of described main measuring system and measuring system for subsequent use, when the two equal non-fault of cover measuring system, form the 3rd criterion;
F, described first criterion, Second Criterion, the 3rd criterion are made logic and operation, draw DC voltage measurement abnormality detection result.
When practical application, two valve groups of certain DC engineering are respectively 400kV.For step B, can be all enable at two of a pole valve group trigger pulse, then select threshold value 0.004, otherwise select threshold value 0.002.For step e, can first according to the record main measuring system of ripple and measuring system for subsequent use whether fault, then fetch logic is anti-, and namely the equal non-fault of two cover measuring systems, then satisfy condition, generate the 3rd criterion, and then be sent to "AND" decision logic; Otherwise do not satisfy condition.
From above-mentioned, enable or when having a measuring system fault, this detection method does not produce effect at valveless group trigger pulse.And when a satisfied pole have valve group trigger pulse enable and without this two criterions of measuring system fault, ask for the difference of the DC voltage UdH of main measuring system and measuring system for subsequent use, and take absolute value, again according to the different operating modes that single valve group or bivalve group are run, select different threshold values: when the absolute value of DC voltage UdH difference is greater than the threshold value chosen, then judge that DC voltage UdH measures abnormal, thus produce corresponding logout and failure wave-recording, for operating maintenance personnel decision-making provides foundation; When above-mentioned absolute value is less than or equal to the threshold value chosen, then do not produce any information.
In the method, analog quantity used and quantity of state are all in direct current protecting program, and without the need to changing hardware, software logic is except generation logout and trigger except record ripple, on original defencive function without impact.
The method automatically achieves DC voltage UdH and measures abnormal criterion in direct current protecting program, solves can only depend on operations staff in the past and observe the problem that efficiency is low, reliability is low caused.
Above-listed detailed description is illustrating for one of the present invention possible embodiments, and this embodiment is also not used to limit the scope of the claims of the present invention, and the equivalence that all the present invention of disengaging do is implemented or changed, and all should be contained in the scope of the claims of this case.
Claims (1)
1. realize a method for voltage measurement abnormality detection at DC protection system, it is characterized in that, comprise the following steps:
A, ask for the absolute value of the difference of the DC voltage UdH of main measuring system and measuring system for subsequent use in DC protection system;
B, set the amplitude of measuring system within the scope of nominal error as numerical value K, the maximum nominal error value that then two measured values subtract each other is 2K, if two valve group trigger pulses of a pole are all in enabled state in DC protection system, select corresponding threshold value to be 2K, otherwise select threshold value to be K;
C, the absolute value of described DC voltage UdH difference and described threshold value to be compared, when the absolute value of DC voltage UdH difference is higher than threshold value, generate the first criterion;
D, judge two valve group trigger pulse enabled state of a pole in DC protection system, when any one valve group trigger pulse is enable, produce Second Criterion;
E, judge the malfunction of described main measuring system and measuring system for subsequent use, when the two equal non-fault of cover measuring system, form the 3rd criterion;
F, described first criterion, Second Criterion, the 3rd criterion are made logic and operation, draw DC voltage measurement abnormality detection result.
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Cited By (5)
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| CN105223406A (en) * | 2015-11-05 | 2016-01-06 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of method realizing current measurement abnormality detection in DC protection system |
| CN107727963A (en) * | 2017-10-10 | 2018-02-23 | 中国南方电网有限责任公司超高压输电公司昆明局 | The DC electrical measurement fault distinguishing method verified based on historical data sample storehouse and algorithm |
| CN110456131A (en) * | 2019-07-25 | 2019-11-15 | 南方电网科学研究院有限责任公司 | A kind of DC voltage measurement exception localization method, device and equipment |
| WO2021063208A1 (en) * | 2019-09-30 | 2021-04-08 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Method for determining abnormal measurement of ultra-high voltage direct current rectifier side voltage |
| CN113589023A (en) * | 2020-04-30 | 2021-11-02 | 南京南瑞继保电气有限公司 | Method and device for rapidly detecting single set of abnormal alternating current measurement of redundant system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105223406A (en) * | 2015-11-05 | 2016-01-06 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of method realizing current measurement abnormality detection in DC protection system |
| CN107727963A (en) * | 2017-10-10 | 2018-02-23 | 中国南方电网有限责任公司超高压输电公司昆明局 | The DC electrical measurement fault distinguishing method verified based on historical data sample storehouse and algorithm |
| CN107727963B (en) * | 2017-10-10 | 2019-08-09 | 中国南方电网有限责任公司超高压输电公司昆明局 | The electrical quantities measurement fault distinguishing method verified based on historical data sample and algorithm |
| CN110456131A (en) * | 2019-07-25 | 2019-11-15 | 南方电网科学研究院有限责任公司 | A kind of DC voltage measurement exception localization method, device and equipment |
| CN110456131B (en) * | 2019-07-25 | 2021-06-22 | 南方电网科学研究院有限责任公司 | Method, device and equipment for positioning direct-current voltage measurement abnormity |
| WO2021063208A1 (en) * | 2019-09-30 | 2021-04-08 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Method for determining abnormal measurement of ultra-high voltage direct current rectifier side voltage |
| CN113589023A (en) * | 2020-04-30 | 2021-11-02 | 南京南瑞继保电气有限公司 | Method and device for rapidly detecting single set of abnormal alternating current measurement of redundant system |
| CN113589023B (en) * | 2020-04-30 | 2024-04-30 | 南京南瑞继保电气有限公司 | Rapid detection method and device for single-set alternating current measurement abnormality of redundant system |
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