CN103701112A - System and method for identifying long/short-term weak links of power grid in running state - Google Patents
System and method for identifying long/short-term weak links of power grid in running state Download PDFInfo
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- CN103701112A CN103701112A CN201310387445.5A CN201310387445A CN103701112A CN 103701112 A CN103701112 A CN 103701112A CN 201310387445 A CN201310387445 A CN 201310387445A CN 103701112 A CN103701112 A CN 103701112A
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Abstract
The invention relates to a system and method for identifying long/short-term weak links of a power grid in an operation state. The system comprises an operation mode generation module, a calculation starting module, a result reading module, a comparing module and an identification module. The method comprises the following steps: (1) periodically reading real-time operation data of the power grid, and generating an operation mode file to be analyzed; (2) starting a stability margin estimation system and BPA (Bonneville Power Administration) simulating computer software; (3) reading the simulation calculation result of the stability margin estimation system and the BPA simulating computer software; (4) comparing the simulation calculation result with relevant provisions stored in a database and relevant limit of operation limit conditions of on-site equipment, and recording over-limit results; (5) identifying the over-limit results, and judging whether the weak links belong to long-term weak spots or short-term weak spots. The method and the system have the advantages that automatic identification of the long/short-term weak links of the power grid is facilitated, and the rapidness and accuracy, and high reliability are achieved.
Description
Technical field
The present invention relates to POWER SYSTEM STATE assessment technology field, particularly a kind of operation of power networks state shot and long term weak link recognition system and method.
Background technology
The weak link of electric power system is divided into three kinds: the first is the weak link of short-term, within 1 year, occur once in a while, and be relevant with the unreasonable arrangement of operational mode; The second is seasonal weak link, in the annual fixedly period, all can occur, relevant with the seasonal variety of Fujian Province's weather; The third is long-term weak link, in whole year, regularly occurs, is relevant with grid structure to the load development of electrical network.In actual motion, seasonal weak link is included into long-term weak link, give common attention rate, so that propose as early as possible solution.
Identification for electric power system weak link in the past often relies on off-line analysis, under limited, predetermined operational mode, analyzes.Generally speaking, systems analyst is according to this area operation of power networks feature, set up several typical operation modes of year, carry out tidal current analysis, security analysis, short circuit current level calculating, transient stability scanning, little interference analysis etc., investigate the permission range of operation whether electrical network electric parameters meets (comprising: voltage, electric current, power, merit angle, frequency etc.) < < guiding rules of power system safety and stability > > (DL_755-2001) and field apparatus.If the short circuit current of certain node surpasses the rupturing capacity of switch, be directly judged as long-term weak link.If other analysis results show: certain weak link does not meet < < guide rule > > regulation and field apparatus operation constraints, carry out the adjustment of operational mode, comprise: generator output adjustment, load tap changer regulate, reactive-load compensation equipment is thrown and moved back operation etc., if the adjustment by operational mode cannot solve out-of-limit problem, must take security and stability control measurement, such as: cut the measures such as machine, cutting load, off-the-line, be judged as long-term weak link.If the adjustment by operational mode can solve out-of-limit problem, be judged as short-term or seasonal weak link.And for the judgement of short-term and seasonal weak link, often according to the relation of local power load characteristic, unit output and seasonal weather, judge.Generally speaking, when certain weak link frequently occurs in a plurality of typical operation modes, even if can solve by the adjustment of operational mode out-of-limit problem, but it should belong to seasonal weak link.In actual motion, out-of-limit if certain equipment at least occurs once every day, we can be considered as long-term weak link.
The efficiency of this analysis mode is lower, a large amount of manual analyses must be carried out and the weak link of electrical network could be grasped comprehensively, otherwise the weak link of analyzing is out not comprehensive, and cannot entirely accurate judge that this weak link belongs to short-term and still belongs to seasonal or long-term, therefore, cannot accurately judge the urgency that solves this weak link, the weak link that is related to grid structure for some cannot be resolved, also cannot identify all seasons weak link, so that this weak link of reinforcement before arriving in same period in the coming year comprehensively.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of operation of power networks state shot and long term weak link recognition system and method are provided, this system and method is conducive to automatically identify the shot and long term weak link of electrical network, and quick and precisely, reliability is high.
For achieving the above object, technical scheme of the present invention is: a kind of operation of power networks state shot and long term weak link recognition system, comprising:
Operational mode generation module, for periodically reading the real-time running data of electrical network, generates operational mode file to be analyzed;
Start computing module, for online stability margin evaluating system and the BPA simulation calculation software of starting;
Reading result module, for reading the simulation result of stability margin evaluating system and BPA simulation calculation software;
Comparison module, compares for the relevant limit value of relevant regulations that simulation result is stored to database and field apparatus operation constraints, and the record result that transfinites;
Identification module, for the result that transfinites is identified, judgement belongs to long-term weak link or short-term weak link.
The present invention also provides the recognition methods of a kind of operation of power networks state shot and long term weak link, comprises the following steps:
(1) periodically read the real-time running data of electrical network, comprise that operational outfit name, generated power are exerted oneself, generator reactive is exerted oneself, load tap changer, reactive-load compensation equipment throw and move back situation, node voltage etc., generates operational mode file to be analyzed;
(2) start online stability margin evaluating system, carry out stability margin assessment; The online BPA simulation calculation software that starts, carries out tidal current analysis, security analysis, calculation of short-circuit current, little interference analysis etc.;
(3) read the simulation result of stability margin evaluating system and BPA simulation calculation software;
(4) simulation result is compared to the relevant limit value of the relevant regulations of storing in database and field apparatus operation constraints, and record the result that transfinites;
(5) result that transfinites is identified: if (a) result of calculation of short-circuit current and little interference analysis transfinites, be directly judged as long-term weak link; (b), if the result of stability margin assessment transfinites, if measure is to cut machine, cutting load or without measure, be judged as long-term weak link, if measure is adjust operation mode, go to step (c); (c) the statistical history data of a year, if the probability that transfinites of this weak link is greater than on average once a day, are judged as long-term weak link.
Compared to prior art, the invention has the beneficial effects as follows the real-time running data based on electrical network, follow the tracks of the Secular Variation Tendency of operation of power networks state, data are carried out to deep excavation, realize the electrical network shot and long term weak link identification based on the assessment of electrical network real-time running state, automaticity is high, quick and precisely, reliability is high, thereby guarantees that critical weak link is resolved as early as possible, ensures power network safety operation.
Accompanying drawing explanation
Fig. 1 is the implementation structure schematic diagram of the recognition system of the embodiment of the present invention.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
Operation of power networks state shot and long term weak link recognition system of the present invention, as shown in Figure 1, comprising:
Operational mode generation module, for periodically reading the real-time running data of electrical network, comprise that operational outfit name, generated power are exerted oneself, generator reactive is exerted oneself, load tap changer, reactive-load compensation equipment throw and move back situation, node voltage etc., then generates operational mode file to be analyzed;
Start computing module, for the online OPEN3000 system (stability margin evaluating system) that starts, carry out stability margin assessment, and start online BPA simulation calculation software, carry out tidal current analysis, security analysis, calculation of short-circuit current, little interference analysis etc.;
Reading result module, for reading the simulation result of OPEN3000 system and BPA simulation calculation software;
Comparison module, compares for the relevant limit value of relevant regulations that simulation result is stored to database and field apparatus operation constraints, and the record result that transfinites;
Identification module, for the result that transfinites is identified, judgement belongs to long-term weak link or short-term weak link.
Operation of power networks state shot and long term weak link of the present invention recognition methods, comprises the following steps:
(1) periodically read the real-time running data of electrical network, comprise that operational outfit name, generated power are exerted oneself, generator reactive is exerted oneself, load tap changer, reactive-load compensation equipment throw and move back situation, node voltage etc., then generates operational mode file to be analyzed;
(2) start online OPEN3000 system, carry out stability margin assessment; The online BPA simulation calculation software that starts, carries out tidal current analysis, security analysis, calculation of short-circuit current, little interference analysis etc.;
(3) read the simulation result of stability margin evaluating system and BPA simulation calculation software;
(4) simulation result is compared to the relevant limit value of the relevant regulations of storing in database and field apparatus operation constraints, and record the result that transfinites;
(5) result that transfinites is identified, concrete steps are as follows:
(a) if the result of calculation of short-circuit current and little interference analysis transfinites, be directly judged as long-term weak link;
(b), if the result of stability margin assessment transfinites, if measure is to cut machine, cutting load or without measure, be judged as long-term weak link, if measure is adjust operation mode, go to step (c);
(c) the statistical history data of a year, if the probability that transfinites of this weak link is greater than on average once a day, are judged as long-term weak link.
Be more than preferred embodiment of the present invention, all changes of doing according to technical solution of the present invention, when the function producing does not exceed the scope of technical solution of the present invention, all belong to protection scope of the present invention.
Claims (2)
1. an operation of power networks state shot and long term weak link recognition system, is characterized in that, comprising:
Operational mode generation module, for periodically reading the real-time running data of electrical network, generates operational mode file to be analyzed;
Start computing module, for online stability margin evaluating system and the BPA simulation calculation software of starting;
Reading result module, for reading the simulation result of stability margin evaluating system and BPA simulation calculation software;
Comparison module, compares for the relevant limit value of relevant regulations that simulation result is stored to database and field apparatus operation constraints, and the record result that transfinites;
Identification module, for the result that transfinites is identified, judgement belongs to long-term weak link or short-term weak link.
2. the recognition methods of operation of power networks state shot and long term weak link, is characterized in that, comprises the following steps:
(1) periodically read the real-time running data of electrical network, comprise that operational outfit name, generated power are exerted oneself, generator reactive is exerted oneself, load tap changer, reactive-load compensation equipment throw and move back situation, node voltage etc., generates operational mode file to be analyzed;
(2) start online stability margin evaluating system, carry out stability margin assessment; The online BPA simulation calculation software that starts, carries out tidal current analysis, security analysis, calculation of short-circuit current, little interference analysis etc.;
(3) read the simulation result of stability margin evaluating system and BPA simulation calculation software;
(4) simulation result is compared to the relevant limit value of the relevant regulations of storing in database and field apparatus operation constraints, and record the result that transfinites;
(5) result that transfinites is identified: if (a) result of calculation of short-circuit current and little interference analysis transfinites, be directly judged as long-term weak link; (b), if the result of stability margin assessment transfinites, if measure is to cut machine, cutting load or without measure, be judged as long-term weak link, if measure is adjust operation mode, go to step (c); (c) the statistical history data of a year, if the probability that transfinites of this weak link is greater than on average once a day, are judged as long-term weak link.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104700318A (en) * | 2015-01-30 | 2015-06-10 | 国家电网公司 | Method for identifying weak link of power distribution network based on equipment power flow topology |
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| CN101814736A (en) * | 2010-03-31 | 2010-08-25 | 清华大学深圳研究生院 | Smart grid realization method of on-line voltage-stability safety estimation system |
| CN102157938A (en) * | 2011-04-12 | 2011-08-17 | 哈尔滨工业大学 | Method for online identifying lower-voltage stability nodes of power system |
| CN102324743A (en) * | 2011-09-21 | 2012-01-18 | 国网电力科学研究院 | The online transient safe and stable assessment of electric power system forecast failure screening technique |
| CN103166219A (en) * | 2013-01-30 | 2013-06-19 | 中国电力科学研究院 | Power grid on-line decision-stabilizing control system and control method based on super real-time emulation |
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| CN101814736A (en) * | 2010-03-31 | 2010-08-25 | 清华大学深圳研究生院 | Smart grid realization method of on-line voltage-stability safety estimation system |
| CN102157938A (en) * | 2011-04-12 | 2011-08-17 | 哈尔滨工业大学 | Method for online identifying lower-voltage stability nodes of power system |
| CN102324743A (en) * | 2011-09-21 | 2012-01-18 | 国网电力科学研究院 | The online transient safe and stable assessment of electric power system forecast failure screening technique |
| CN103166219A (en) * | 2013-01-30 | 2013-06-19 | 中国电力科学研究院 | Power grid on-line decision-stabilizing control system and control method based on super real-time emulation |
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| CN104700318A (en) * | 2015-01-30 | 2015-06-10 | 国家电网公司 | Method for identifying weak link of power distribution network based on equipment power flow topology |
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