CN102638041A - Method forquickly checking safety and stability of scheduling operation of power system on line - Google Patents
Method forquickly checking safety and stability of scheduling operation of power system on line Download PDFInfo
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Abstract
The invention discloses a method for checking the safety and stability of the scheduling operation of a power system on line, which is suitable for carrying out quick online evaluation on the safety and stability of a power grid implementing a scheduling operation before a scheduling operator sends out a scheduling command, thereby reducing the potential safety hazard brought by the scheduling operation. According to a present trending level and based on ultrashort-term prediction information, the method disclosed by the invention forms a safety and stability checking section at time when scheduling operation is expected to be implemented; aiming at the change of a system trending and the stable level caused by the scheduling operation and based on the current safety and stability evaluation result and electric distance between a fault element and a scheduling operation element, a check fault set is automatically generated; finally operation risks are estimated and a corresponding operation treatment plan is proposed, thereby immediately avoiding the potential safety hazards caused by an incorrect scheduling command.
Description
Technical field
The present invention relates to a kind of check method of power system dispatching operation, belong to the power system analysis technical field.
Background technology
Power system dispatching operation is the adjustment power system operating mode, handle the basic means of the unusual and accident of electrical network, how to guarantee the fail safe of operating be must reply in the dispatching of power netwoks routine work problem.Along with the continuous expansion of scale of power, the contact between the electrical network is tight day by day, and on the one hand, the improper influence to system safety stability of scheduling operation may enlarge; On the other hand, the dispatcher is had higher requirement in operational capacity under the various complex working conditions and the quick reaction capability under the accident condition.Existing operating system is main with anti-error verification of grid switching operation and tidal current analysis generally, mainly relies on operations staff's subjective experience to judge for the safety and stability state of operating the back electrical network.Therefore press for before dispatching command issues, the security and stability of system behind the rapid evaluation scheduling operation effectively reduces the risk that scheduling operation causes to system.
In recent years, safety on line stability analysis and control technology have obtained considerable application effect, have brought into play important function for supporting power network safety operation, check fast for the safety on line of scheduling operation is stable and have laid a good foundation.Patent " electrical power system on-line safety and stability evaluation forecast failure collection adaptive screening technique " (application number is 200810243660.7) is an index with safety and stability nargin; Intensity of variation in conjunction with safe and stable mode and operation of power networks state; From the forecast failure complete or collected works, filter out the forecast failure subclass that need recomputate; Can reduce the stable scale of assessing with forecast failure collection of safety on line under the current time section, improve the computational speed of the stable assessment of safety on line.Patent " the online transient safe and stable of electric power system assessment forecast failure screening technique " (application number is 201110279948.1) has been further considered element throwing/move back the influence to safety and stability nargin and pattern, and the present invention has used some technology in the above-mentioned patent.
Summary of the invention
In order to overcome the deficiency of prior art; Shorten the computing time that scheduling operation safety is checked; The invention provides a kind of power system dispatching and operate online safety and stability check method fast; For assessment scheduling operation risk provides technical support, in time find the potential safety hazard that scheduling operation possibly bring, guarantee the safe and stable operation of electrical network.
The inventive method mainly comprises the steps:
Step 1: estimate to implement constantly according to real-time power network operational mode information and scheduling operation, according to ultra-short term, generation schedule with send plan outside, be formed for the basic section that the scheduling operation safety and stability is checked;
Step 2: check basic section and scheduling operation instruction based on the scheduling operation safety and stability, the electrical network after the operation is carried out the analysis of network vulnerability, and form trend, stability Calculation data file;
Step 3: according to the safety and stability nargin and the pattern of the current running status of electrical network; Variation size, fault element that estimate to implement the state of operation of power networks constantly in conjunction with scheduling operation generate the forecast failure collection that is used for the check of scheduling operation safety and stability automatically to the electrical distance between the scheduling operation element;
Step 4: based on trend, the stability Calculation data file of step 2 generation, and the forecast failure collection of step 3 generation, application safety stability unified quantization method, the electricity net safety stable level behind the comprehensive assessment scheduling operation; To the situation that scheduling operation causes electricity net safety stable nargin not meet the demands, calculate the control measure of improving the safety and stability level, and form the suggestion of scheduling operation aid decision.
Further; The formation method that is used for the basic section of scheduling operation safety and stability check described in the step 1 is: the trend section with system's current time is the basis; According to ultra-short term, generation schedule with send the meritorious plan that provides of plan outside; Use idle automatic adjustment technologies, formation estimates to implement the immediate trend section of operation of power networks operating mode constantly with scheduling operation, as the benchmark section of scheduling operation safety and stability check; If scheduling operation estimate to be implemented constantly time interval with current time less than a certain set point, the benchmark section that selective system current time section is checked as safety and stability;
The reactive load method of adjustment is: power factor equates under guarantee respectively to load bus power factor and the current time trend operating mode, is 0 if the bus of loading under the current time trend operating mode is gained merit, and then calculates by default power factor;
The generator reactive method of adjustment is: for the generator of PV node type, its set end voltage is consistent with the set end voltage of current time; For the generator of PQ node type, by the adjustment of constant power factor (, then providing) by limit value if exceed the generator reactive limit value; If unit outage under the current time is then got default value.
Further, the generation method that is used for the forecast failure collection that the scheduling operation safety and stability checks described in the step 3 is:
(1) calculates among the forecast failure complete or collected works each fault element respectively to the minimum electrical distance of scheduling operation element, if electrical distance less than set point, then concentrates corresponding fault as the fault that must carry out the safety check forecast failure;
(2) to remaining forecast failure after step (1) screening; Safety and stability nargin with reflection electricity net safety stable degree is index; In conjunction with the difference between the current running status of operation of power networks state and electrical network behind the scheduling operation, filter out and to carry out the fault that safety is checked;
(3) fault that step (1) and (2) is filtered out merges as being used for the fault collection that scheduling operation safety is checked.
Further, the step of the vulnerability of network described in step 2 analysis is following:
(1) with node/branch road model conversation is the linked list data storage of electric network figure;
(2) analyze based on the limit connectivity of figure, adopt the depth-first search algorithm to seek the bridge of figure, draw the weak passage in the electric power networks;
(3) break off every bridge, adopt the BFS algorithm to seek each connected component, obtain electrical network isolated island information; To occurring the situation of electrical network isolated island behind the scheduling operation, provide warning information prompting dispatcher and note.
The check method that the present invention proposes can utilize real-time power network operational mode information and plan information; Form scheduling operation and estimate to implement trend section constantly; Through the automatic screening forecast failure; Realize the rapid evaluation and the aid decision of operation back electrical network static state, transient state and dynamic security, technical support is provided, evade the scheduling operation risk that operation brings to system in time for the management and running personnel formulate scheduling operating command.
Description of drawings
Fig. 1 is the schematic flow sheet of the inventive method.
Embodiment
With embodiment the present invention is done further explain below in conjunction with accompanying drawing 1.
The step 1 of accompanying drawing 1 is the flow process that is formed for the basic section of scheduling operation safety check.
Estimate to implement constantly according to real-time power network operational mode information and scheduling operation; At ultra-short term, generation schedule with send outside on the basis of the meritorious plan that provides of plan; Use idle automatic adjustment technologies; Formation estimates to implement the immediate trend section of operation of power networks operating mode constantly with scheduling operation, as the benchmark section of scheduling operation safety and stability check.If scheduling operation is implemented demand urgent (like accident treatment); Then the current trend section of selective system is checked basic section as safety and stability; For example scheduling operation estimate to be implemented constantly time interval t with current time less than a certain set point T, but the benchmark section that selective system current time section is checked as safety.The setting of T value and planning data refresh cycle (generally between 5-15 minute) and relevant, but the more then reduced data processing procedure that the T value is got to the requirement of check result precision, but do not consider planning data, can make the check result precision poor slightly.
The reactive load method of adjustment is: power factor equates under guarantee respectively to load bus power factor and the current time trend operating mode, is 0 if the bus of loading under the current time trend operating mode is gained merit, and then calculates by default power factor.
The generator reactive method of adjustment is: for the generator of PV node type, its set end voltage is consistent with the set end voltage of current time; For the generator of PQ node type, by the adjustment of constant power factor (, then providing) by limit value if exceed the generator reactive limit value; If unit outage under the current time is then got default value.
What the step 2 of accompanying drawing 1 was described is according to the scheduling operation instruction, and the electrical network after the operation is carried out the analysis of network vulnerability, and forms operation back trend, stability Calculation data file.
Carry out network topology and electrical network vulnerability analytical procedure is following based on graph theory:
1, with node/branch road model conversation is the linked list data storage of electric network figure;
2, analyze (if leave out a limit among the figure based on the limit connectivity of figure; The figure of a connection is divided into two or more connected components; Then this limit is the bridge of figure; One does not have the connected graph of bridge to be called the limit connected graph), adopt the depth-first search algorithm to seek the bridge of figure, draw the weak passage in the electric power networks;
3, break off every bridge, adopt the BFS algorithm to seek each connected component, obtain electrical network isolated island information.To occurring the situation of electrical network isolated island behind the scheduling operation, provide warning information prompting dispatcher and note.
What accompanying drawing step 3 was described is that automatic screening is used for the forecast failure collection flow process that the scheduling operation safety and stability is checked.
The automatic screening step of fault is following:
(1) calculates among the forecast failure complete or collected works each fault element respectively to the minimum electrical distance of scheduling operation element; (this setting value is chosen based on engineering experience: when this value is got higher value less than setting value as if electrical distance; The necessary number of faults of checking that filters out is more; The check time is longer), then forecast failure is concentrated corresponding fault as carrying out the fault that safety is checked;
(2) to remaining forecast failure after step (1) screening; Safety and stability nargin with reflection electricity net safety stable degree is index; In conjunction with the difference between the current running status of operation of power networks state and electrical network behind the scheduling operation, filter out and need carry out the fault that safety is checked:
(a), confirm the bigger equipment of safety and stability nargin influence according to the safety and stability nargin and the safe and stable mode of current time operation of power networks state;
(b) combine scheduling operation to estimate to implement the variation size of the state of operation of power networks constantly, confirm to recomputate the safe and stable mode and the nargin threshold value of forecast failure with respect to current operation of power networks state;
(c) the safety and stability nargin according to each forecast failure increases the characteristic that confidence level descends in time; Nargin-the function of time that adopts safety and stability nargin to increase in time and reduce; On the basis of the safety and stability nargin of each fault of current time, directly estimate the safety and stability nargin of each forecast failure respectively;
(d) filter out the forecast failure of the nargin of estimation from the forecast failure complete or collected works less than the nargin threshold value.
(3) fault that step (1) and (2) is filtered out merges as being used for the fault collection that scheduling operation safety is checked.
What the step 4 of accompanying drawing 1 was described is computing function and the flow process that scheduling operation safety is checked, and the dispatcher can select calculation task according to actual needs, comprises the stable assessment of static state/transient state/dynamic security, and the transmission cross-section limit power is calculated and the prevention and control aid decision.Safety is checked module and is adopted the unified quantization analytical method, carries out the comprehensive Quantified Evaluation of static security, transient state and dynamic security stability; If the electricity net safety stable level behind the scheduling operation meets the demands, then carry out the transmission cross-section limit and calculate; Cause electricity net safety stable property to have the situation of hidden danger to scheduling operation, calculate the prevention and control measure that improves safety and stability nargin.
Claims (4)
1. a power system dispatching is operated the quick check method of online safety and stability, it is characterized in that, comprises the steps:
Step 1: estimate to implement constantly according to real-time power network operational mode information and scheduling operation, according to ultra-short term, generation schedule with send plan outside, be formed for the basic section that the scheduling operation safety and stability is checked;
Step 2: check basic section and scheduling operation instruction based on the scheduling operation safety and stability, the electrical network after the operation is carried out the analysis of network vulnerability, and form trend, stability Calculation data file;
Step 3: according to the safety and stability nargin and the pattern of the current running status of electrical network; Variation size, fault element that estimate to implement the state of operation of power networks constantly in conjunction with scheduling operation generate the forecast failure collection that is used for the check of scheduling operation safety and stability automatically to the electrical distance between the scheduling operation element;
Step 4: based on trend, the stability Calculation data file of step 2 generation, and the forecast failure collection of step 3 generation, application safety stability unified quantization method, the electricity net safety stable level behind the comprehensive assessment scheduling operation; To the situation that scheduling operation causes electricity net safety stable nargin not meet the demands, calculate the control measure of improving the safety and stability level, and form the suggestion of scheduling operation aid decision.
2. power system dispatching according to claim 1 is operated the quick check method of online safety and stability; It is characterized in that; The formation method that is used for the basic section of scheduling operation safety and stability check in the said step 1 is: the trend section with system's current time is the basis; According to ultra-short term, generation schedule with send the meritorious plan that provides of plan outside; Use idle automatic adjustment technologies, formation estimates to implement the immediate trend section of operation of power networks operating mode constantly with scheduling operation, as the benchmark section of scheduling operation safety and stability check; If scheduling operation estimate to be implemented constantly time interval with current time less than a certain set point, the benchmark section that selective system current time section is checked as safety and stability;
The reactive load method of adjustment is: power factor equates under guarantee respectively to load bus power factor and the current time trend operating mode, is 0 if the bus of loading under the current time trend operating mode is gained merit, and then calculates by default power factor;
The generator reactive method of adjustment is: for the generator of PV node type, its set end voltage is consistent with the set end voltage of current time; For the generator of PQ node type, by the adjustment of constant power factor (, then providing) by limit value if exceed the generator reactive limit value; If unit outage under the current time is then got default value.
3. power system dispatching according to claim 1 and 2 is operated the quick check method of online safety and stability, it is characterized in that, the generation method that is used for the forecast failure collection of scheduling operation safety and stability check in the said step 3 is:
(1) calculates among the forecast failure complete or collected works each fault element respectively to the minimum electrical distance of scheduling operation element, if electrical distance less than set point, then concentrates corresponding fault as the fault that must carry out the safety check forecast failure;
(2) to remaining forecast failure after step (1) screening; Safety and stability nargin with reflection electricity net safety stable degree is index; In conjunction with the difference between the current running status of operation of power networks state and electrical network behind the scheduling operation, filter out and to carry out the fault that safety is checked;
(3) fault that step (1) and (2) is filtered out merges as being used for the forecast failure collection that the scheduling operation safety and stability is checked.
4. method according to claim 1 and 2 is characterized in that, the step that the network vulnerability is analyzed in the said step 2 is following:
(1) with node/branch road model conversation is the linked list data storage of electric network figure;
(2) analyze based on the limit connectivity of figure, adopt the depth-first search algorithm to seek the bridge of figure, draw the weak passage in the electric power networks;
(3) break off every bridge, adopt the BFS algorithm to seek each connected component, obtain electrical network isolated island information; To occurring the situation of electrical network isolated island behind the scheduling operation, provide warning information prompting dispatcher and note.
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| CN103346564A (en) * | 2013-07-24 | 2013-10-09 | 国家电网公司 | Method for intelligently generating tripping sudden accident emergency plan of main transformer of transformer substation |
| CN103354388A (en) * | 2013-06-19 | 2013-10-16 | 国家电网公司 | Multi-service linked electric power operation instruction issuing method |
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| CN103761680A (en) * | 2014-01-16 | 2014-04-30 | 华南理工大学 | Grid and provincial dispatching method and device for AC/DC interconnected large power grid with wind farm |
| CN105071379A (en) * | 2015-07-28 | 2015-11-18 | 国家电网公司 | AC-DC coordination control effect evaluation method and AC-DC coordination control effect evaluation device based on multi-source data |
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| CN105896735A (en) * | 2016-04-27 | 2016-08-24 | 国家电网公司 | Real-time diagnostic method and system for operating state of power grid |
| CN109711450A (en) * | 2018-12-20 | 2019-05-03 | 北京科东电力控制系统有限责任公司 | A kind of power grid forecast failure collection prediction technique, device, electronic equipment and storage medium |
| CN112015953A (en) * | 2020-07-20 | 2020-12-01 | 贵州电网有限责任公司 | Power grid element real-time risk early warning method based on network topology tracking technology |
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| CN103077480B (en) * | 2013-01-07 | 2014-03-12 | 中国电力科学研究院 | Safety checking method for power system |
| CN103077480A (en) * | 2013-01-07 | 2013-05-01 | 中国电力科学研究院 | Safety checking method for power system |
| CN103354388A (en) * | 2013-06-19 | 2013-10-16 | 国家电网公司 | Multi-service linked electric power operation instruction issuing method |
| CN103354388B (en) * | 2013-06-19 | 2015-07-01 | 国家电网公司 | Multi-service linked electric power operation instruction issuing method |
| CN103346564A (en) * | 2013-07-24 | 2013-10-09 | 国家电网公司 | Method for intelligently generating tripping sudden accident emergency plan of main transformer of transformer substation |
| CN103679296A (en) * | 2013-12-24 | 2014-03-26 | 云南电力调度控制中心 | Grid security risk assessment method and model based on situation awareness |
| WO2015096153A1 (en) * | 2013-12-24 | 2015-07-02 | 云南电力调度控制中心 | Grid security risk assessment method and model based on situation awareness |
| CN103761680B (en) * | 2014-01-16 | 2017-02-15 | 华南理工大学 | Grid and provincial dispatching method and system for AC/DC interconnected large power grid with wind farm |
| CN103761680A (en) * | 2014-01-16 | 2014-04-30 | 华南理工大学 | Grid and provincial dispatching method and device for AC/DC interconnected large power grid with wind farm |
| CN105139075A (en) * | 2015-05-04 | 2015-12-09 | 国电南瑞科技股份有限公司 | Electric power system safety stabilization prevention control rolling decision method in consideration of real-time plan |
| CN105139075B (en) * | 2015-05-04 | 2019-07-05 | 国电南瑞科技股份有限公司 | Consider that the power system security planned in real time stablizes prevention and control Rolling decision method |
| CN105071379A (en) * | 2015-07-28 | 2015-11-18 | 国家电网公司 | AC-DC coordination control effect evaluation method and AC-DC coordination control effect evaluation device based on multi-source data |
| CN105896735B (en) * | 2016-04-27 | 2018-06-22 | 国家电网公司 | A kind of operation of power networks state real-time diagnosis method and system |
| CN105896735A (en) * | 2016-04-27 | 2016-08-24 | 国家电网公司 | Real-time diagnostic method and system for operating state of power grid |
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| CN112015953A (en) * | 2020-07-20 | 2020-12-01 | 贵州电网有限责任公司 | Power grid element real-time risk early warning method based on network topology tracking technology |
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