CN103560497B - A kind of short circuit current method for limiting based on power network topology adjustment - Google Patents
A kind of short circuit current method for limiting based on power network topology adjustment Download PDFInfo
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Abstract
The invention provides a kind of short circuit current method for limiting based on power network topology adjustment, concrete steps are 1: build potential strategy set; 2: determine candidate's topology adjustable strategies according to comprehensive Validity Index value; 3: safety analysis is carried out to the grid short circuit electric current after execution candidate topology adjustable strategies and operation of power networks state; 4: Losses Analysis is carried out to operation of power networks state; Choose the candidate topology adjustable strategies corresponding with loss minimization value as target topology adjustable strategies.Compared to the prior art, a kind of short circuit current method for limiting based on power network topology adjustment provided by the invention, comprehensive Validity Index value is adopted to reflect the restriction of topological adjustable strategies to the whole network short circuit current level objectively, and effective strategy can be searched out rapidly and accurately from the potential strategy of substantial amounts, safety evaluation is carried out to strategy and determines exercisable topological adjustable strategies.
Description
Technical field
The present invention relates to a kind of short circuit current method for limiting, be specifically related to a kind of short circuit current method for limiting based on power network topology adjustment.
Background technology
Along with the expanding day of China's electrical network scale, constantly putting into operation and each large regional grid interconnected of large sized unit, Power System Shortcuts levels of current also increases day by day, the short circuit current level in many areas, oneself is through meeting or exceeding the maximum permissible value that electric power code limits, and threatens system safety operation.Consider the actual conditions of China, present stage can not transform power equipment and power circuit etc. again on a large scale.How to adjust existing rack, optimize existing electric network composition, reducing short circuit current level has been a comparatively urgent actual demand.
Article " operative practice of electric power transmission network reconstruct in Shanghai Power Network " is for Shanghai Power Network, describe the practical application of network reconfiguration in power transmission network, play power transmission network self potentiality by electric power transmission network reconstruct, realize improving system reliability, reducing the objects such as short circuit current.The situation that article " restriction Guangdong 500kV grid short circuit electric current operating scheme " exceeds standard for station, Guangdong Power Grid Pengcheng 500kV busbar short-circuit levels of current, measure by excising the 500kV outlet of station, 1 time Pengcheng is proposed, increase the electrical distance of station, Pengcheng and this outlet offside transformer station, reduce the short circuit current that this outlet offside transformer station provides.But the formulation of empirical topological adjustable strategies cannot from system-wide angle formulation optimal policy, and decision-making link is in addition more, and real-time is also difficult to be guaranteed.Article " the rack adjust the algorithm of optimizing of restriction 500kV grid short circuit electric current " proposes a kind of rack adjust the algorithm of optimizing, disposable formation is only needed to pay close attention to the impedance matrix of node, namely asking for the most possible rack regulating measures limiting a short circuit current that exceeds standard by programming fast, avoiding and the complicated processes of checking one by one is combined to all broken strings; But the existence of this algorithm only can adopt open-circuit line as regulating measure, the shortcoming that practicality is poor.Therefore, provide a kind of and the power network topology adjustment general-purpose algorithm limiting short-circuit current of Fast Practical can seem particularly important.
Summary of the invention
In order to meet the demand of prior art, the invention provides a kind of short circuit current method for limiting based on power network topology adjustment, described method comprises the steps:
Step 1: build potential strategy set;
Step 2: determine candidate's topology adjustable strategies according to comprehensive Validity Index value;
Step 3: safety analysis is carried out to the grid short circuit electric current after execution described candidate's topology adjustable strategies and operation of power networks state; And
Step 4: Losses Analysis is carried out to described operation of power networks state; Choose the described candidate topology adjustable strategies corresponding to loss minimization value as target topology adjustable strategies.
Preferably, build the potential measure set of topological adjustable strategies, obtain the impedance matrix of electrical network; Described potential strategy set is built according to described potential measure set in described step 1; The initial value of the number N of the described potential measure of each described topological adjustable strategies is 1; Described potential measure comprises line disconnection, transformer cut-offs, generator outage, 3/2 wiring go out string run and bus section run;
Preferably, the described comprehensive Validity Index value in described step 2 to exceed standard the current limliting validity of node for evaluating all short circuit currents performing the electrical network after topological adjustable strategies; The concrete steps obtaining described comprehensive Validity Index value are:
Step 2-1: calculate the single described short circuit current of described topological adjustable strategies to exceed standard the Validity Index value of node by the exceed standard impedance matrix of node of described short circuit current
wherein i is that described short circuit current exceeds standard node, Z
iifor performing the diagonal element corresponding with i of the impedance matrix before described topological adjustable strategies, Z
ii' for performing the diagonal element corresponding with i of the impedance matrix after described topological adjustable strategies;
Step 2-2: the described comprehensive Validity Index value of Validity Index value acquisition of the node that exceeded standard by single described short circuit current
wherein, n is that short circuit current exceeds standard nodes; SI
lbe that l described short circuit current exceeds standard the described Validity Index value of node;
be that l described short circuit current exceeds standard the weights of node, I
lbe that l described short circuit current exceeds standard the actual short current value of node, I
blbe that l described short circuit current exceeds standard the actual short upper current limit value of node;
Step 2-3: descending is carried out to described comprehensive Validity Index value, thus determine described candidate topology adjustable strategies;
Preferably, described Z
ii' by obtaining the correction of the impedance matrix performed after described topological adjustable strategies; Described modification method is branch additional method;
Preferably, described in described step 3, safety analysis concrete steps are:
Step 3-1: the described actual short current value of node exceedes described actual short upper current limit value if described short circuit current exceeds standard, then the number N of the potential measure of topological adjustable strategies is added 1, and return step 2; Described actual short upper current limit value is that described short circuit current exceeds standard the breaking current of circuit breaker of node;
Step 3-2: fail safe simulation analysis is carried out to described operation of power networks state; Described fail safe simulation analysis comprises Load flow calculation, static security analysis and transient security analysis; If described operation of power networks state can not meet the safety requirements of operation, the number N of the potential measure of described topological adjustable strategies is added 1, and returns step 2.
Compared with immediate prior art, excellent effect of the present invention is:
1, in technical solution of the present invention, by building the comprehensive Validity Index value of topological adjustable strategies, carry out preferably to topological adjustable strategies, the exceed standard short circuit current level of node of whole short circuit current is all dropped within permissible value, thus effective restriction the whole network short circuit current level;
2, in technical solution of the present invention, comprehensive Validity Index value can consider that each short circuit current exceeds standard the size of the degree that exceeds standard of node, exceeded standard by the single short circuit current of restriction the maximum of Validity Index value of node simultaneously, avoids only having the non-effective strategy of significant short circuit current restriction to obtain larger comprehensive Validity Index value to part of nodes;
3, in technical solution of the present invention, comprehensive Validity Index value can reflect the restriction of topological adjustable strategies to the whole network short circuit current level objectively, and the fast search for topological adjustable strategies provides effective guidance;
4, in technical solution of the present invention, not needing to carry out the whole network calculation of short-circuit current for often kind of candidate policy to the search of topological adjustable strategies, obtaining only by calculating comprehensive Validity Index value, less, the safe and reliable applicable application on site of amount of calculation;
5, a kind of short circuit current method for limiting based on power network topology adjustment provided by the invention, short circuit current for electrical network exceeds standard the concrete condition of bus nodes, by calculating Validity Index value corresponding to all kinds of measure, effective strategy is searched out rapidly and accurately from the potential strategy of substantial amounts, simultaneously by carrying out fail safe and economic evaluation to strategy, finally determine exercisable topological adjustable strategies.
6, a kind of short circuit current method for limiting based on power network topology adjustment provided by the invention, amount of calculation is less, be applicable to being applied to supporting system technology online, network topology adjustable strategies can be provided timely and accurately for dispatching of power netwoks operations staff, effective restriction grid short circuit levels of current, ensures the safety and economic operation of electrical network.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further described.
Fig. 1 is: a kind of short circuit current method for limiting flow chart based on power network topology adjustment in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is clearly and completely described.
The invention provides a kind of short circuit current method for limiting based on power network topology adjustment of Fast Practical, Fig. 1 shows the method flow diagram of the method; Described method concrete steps are:
Step 1: cut-off by potential measure line disconnection, transformer, generator outage, 3/2 wiring go out string and to run and bus section runs and builds the potential measure set of topological adjustable strategies; Potential strategy set is built according to potential measure set; The number N initial value of the potential measure that each topological adjustable strategies in potential strategy set is corresponding is 1, namely only has a potential measure in each topological adjustable strategies under initial situation;
Step 2: the comprehensive Validity Index value obtaining topological adjustable strategies, comprehensive Validity Index value to exceed standard the current limliting validity of node for evaluating all short circuit currents performing the electrical network after topological adjustable strategies; Concrete steps are:
Step 2-1: calculate the single short circuit current performed after topological adjustable strategies in electrical network to exceed standard the Validity Index value of node by the exceed standard impedance matrix of node of short circuit current
wherein i is that short circuit current exceeds standard node, Z
iifor performing the diagonal element corresponding with i of the impedance matrix before topological adjustable strategies, Z
ii' for performing the diagonal element corresponding with i of the impedance matrix after topological adjustable strategies; Described Z
ii' by obtaining the correction of the impedance matrix performed after topological adjustable strategies; Modification method is branch additional method;
Step 2-2: obtain the comprehensive Validity Index value of topological adjustable strategies by the exceed standard Validity Index value of node of single short circuit current
wherein, n is that short circuit current exceeds standard nodes; SI
lbe that l short circuit current exceeds standard the Validity Index value of node;
be that l short circuit current exceeds standard the weights of node, I
lbe that l short circuit current exceeds standard the actual short current value of node, I
blbe that l short circuit current exceeds standard the actual short upper current limit value of node;
Actual short upper current limit value is that short circuit current exceeds standard the breaking current of circuit breaker of Nodes;
Step 2-3: carry out descending to comprehensive Validity Index value, by the alternatively topological adjustable strategies of topological adjustable strategies higher for comprehensive Validity Index value.
Step 3: safety analysis is carried out to the grid short circuit electric current after the topological adjustable strategies of execution and operation of power networks state; Be specially:
Step 3-1: calculate respectively perform comprehensive Validity Index value come several topological adjustable strategies above (i.e. the topological adjustable strategies of candidate) after short circuit current to exceed standard the actual short current value of node; If actual short current value exceedes actual short upper current limit value, then the number N of the potential measure of topological adjustable strategies is added 1, be about to increase a potential measure in this topological adjustable strategies; And return step 2;
Step 3-2: for candidate's topology adjustable strategies that effectively grid short circuit electric current can be reduced to reasonable level, fail safe simulation analysis is carried out to the operation of power networks state performed thereafter, comprises Load flow calculation, static security analysis and transient security analysis; If operation of power networks state can not meet the safety requirements of operation, the number N of the potential measure of topological adjustable strategies is added 1, and returns step 2.
Step 4: for the candidate's topology adjustable strategies required by short circuit current and power grid security, Losses Analysis is carried out to the operation of power networks state performed thereafter; The candidate topology adjustable strategies corresponding to loss minimization value is selected to export as target topology adjustable strategies.
Finally should be noted that: described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the application's protection.
Claims (4)
1., based on a short circuit current method for limiting for power network topology adjustment, it is characterized in that, described method comprises the steps:
Step 1: build potential strategy set;
Step 2: determine candidate's topology adjustable strategies according to comprehensive Validity Index value;
Step 3: safety analysis is carried out to the grid short circuit electric current after execution described candidate's topology adjustable strategies and operation of power networks state;
Step 4: Losses Analysis is carried out to described operation of power networks state; Choose the described candidate topology adjustable strategies corresponding to loss minimization value as target topology adjustable strategies;
Described comprehensive Validity Index value in described step 2 to exceed standard the current limliting validity of node for evaluating all short circuit currents performing the electrical network after topological adjustable strategies; The concrete steps obtaining described comprehensive Validity Index value are:
Step 2-1: calculate the single described short circuit current of described topological adjustable strategies to exceed standard the Validity Index value of node by the exceed standard impedance matrix of node of described short circuit current
wherein i is that described short circuit current exceeds standard node, Z
iifor performing the diagonal element corresponding with i of the impedance matrix before described topological adjustable strategies, Z
ii' for performing the diagonal element corresponding with i of the impedance matrix after described topological adjustable strategies;
Step 2-2: the described comprehensive Validity Index value of Validity Index value acquisition of the node that exceeded standard by single described short circuit current
wherein, n is that short circuit current exceeds standard nodes; SI
lbe that l described short circuit current exceeds standard the described Validity Index value of node;
be that l described short circuit current exceeds standard the weights of node, I
lbe that l described short circuit current exceeds standard the actual short current value of node, I
blbe that l described short circuit current exceeds standard the actual short upper current limit value of node;
Step 2-3: descending is carried out to described comprehensive Validity Index value, thus determine described candidate topology adjustable strategies.
2. a kind of short circuit current method for limiting based on power network topology adjustment as claimed in claim 1, is characterized in that, build the potential measure set of topological adjustable strategies, obtain the impedance matrix of electrical network; Described potential strategy set is built according to described potential measure set in described step 1; The initial value of the number N of the described potential measure of each described topological adjustable strategies is 1; Described potential measure comprises line disconnection, transformer cut-offs, generator outage, 3/2 wiring go out string run and bus section run.
3. as claimed in claim 1 a kind of based on power network topology adjustment short circuit current method for limiting, it is characterized in that, described Z
ii' by obtaining the correction of the impedance matrix performed after described topological adjustable strategies; Adopt impedance matrix described in branch additional method correction.
4. as claimed in claim 1 a kind of based on power network topology adjustment short circuit current method for limiting, it is characterized in that, described in described step 3, safety analysis concrete steps are:
Step 3-1: the described actual short current value of node exceedes described actual short upper current limit value if described short circuit current exceeds standard, then the number N of the potential measure of topological adjustable strategies is added 1, and return step 2; Described actual short upper current limit value is that described short circuit current exceeds standard the breaking current of circuit breaker of node;
Step 3-2: fail safe simulation analysis is carried out to described operation of power networks state; Described fail safe simulation analysis comprises Load flow calculation, static security analysis and transient security analysis; If described operation of power networks state can not meet the safety requirements of operation, the number N of the potential measure of described topological adjustable strategies is added 1, and returns step 2.
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| CN104410065B (en) * | 2014-10-31 | 2015-10-21 | 广东电网有限责任公司电力调度控制中心 | A kind of Multiobjective Decision Making Method of receiving end electrical network limiting short-circuit current |
| CN109842104B (en) * | 2018-12-27 | 2020-04-21 | 国网浙江省电力有限公司电力科学研究院 | Fault current limiter configuration method based on minimum impedance |
| CN110503272B (en) * | 2019-09-06 | 2023-05-30 | 中国南方电网有限责任公司 | Short-circuit-limiting current auxiliary decision-making method and system meeting safety and stability requirements |
| CN111262227A (en) * | 2020-01-17 | 2020-06-09 | 华北电力大学 | Method and device for regulating system topology to limit breaker on-off short-circuit current |
| CN112039053B (en) * | 2020-08-03 | 2024-05-24 | 国网湖北省电力有限公司经济技术研究院 | Method for determining outlet number of hub substation based on short-circuit current constraint |
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