CN101685481A - Method and system for calculating on-line power transmission margin based on parallel algorithm - Google Patents
Method and system for calculating on-line power transmission margin based on parallel algorithm Download PDFInfo
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Abstract
The invention discloses a method and a system for calculating an on-line power transmission margin based on a parallel algorithm. The system comprises a management part and a calculation part. The method comprises the following steps: the management part generates a control file of a calculation task; the calculation part carries out calculation and returns the calculation result; the management part analyzes the calculation results to generate a control file of a checking task; the calculation part calculates the stability of the system and returns the calculation result after acquiring the checking task; the management part analyzes the calculation results to determine gears which are stable to a checking failure system as a power transmission margin. Based on collected power grid real time data actually, the invention combines a preset mode based on safe stability to determine a regulation principle and a method in real time, and automatically carries out limit calculation on the power transmission margin of a designated cross section by adopting a large-scale parallel computing processing technology, so as to reach the purposes of improving computation speed and truly reflecting the actual situation of a power grid and better guide actual operation of the power grid.
Description
Technical field
The present invention relates to stabilization of power grids analysis field, refer to the method and system of the online transmission of electricity nargin of a kind of calculating especially based on parallel algorithm.
Background technology
Transmission of electricity nargin be meant under the specific method of operation, guaranteeing system's generation forecast accident after system can keep the maximum delivery power of stable operation.Transmission of electricity nargin is the direct reflection of system's ability to transmit electricity, at the network system of reality, calculates the stability margin of important transmission cross-section automatically, and the operation of real system is had important directive function.
In the existing electric system actual moving process, the calculating of transmission of electricity nargin mainly adopts based on typical operation modes, adjust, utilize Power System Off-line simulated program serial computing manually.The key step of calculating is as follows:
1, is identified for the typical operation modes of calculating limit.This typical way is according to the data acquisition of the artificial constructed simulation real system of factors such as practical operating experiences, equipment operation situation, adopts the bigger method of operation of the more serious through-put power of stable case usually;
2, determine the transmission cross-section that calculates, the principle of adjustment etc.Transmission cross-section normally between the important area, economize between or the important circuit that send electric channel, the principle of adjustment comprises the sequential scheduling of the element of adjustment, adjustment;
3, all sections are all repeated following computation process:
Satisfying all specified fault up to a performance number adjusting to this section can both stablize, and continue to increase power system again and can not stablize, and the power difference is thought to reach power limit less than certain limit.This performance number is exactly the transmission of electricity nargin of this transmission cross-section.
There is following problem in the computing method of existing transmission of electricity nargin:
The actual conditions that 1, can not truly reflect electrical network
Existing transmission of electricity nargin all be based on adjust on the basis of typical operation modes data and real data certain difference is arranged, can not reflect the state of actual motion.The general transmission of electricity nargin of section during all greater than actual motion of the transmission of electricity nargin of calculating, result of calculation is more conservative, and economy is poor; But sometimes also may be less than the transmission of electricity nargin of actual motion, the result relatively advances rashly, and brings the hidden danger of security.
2, to the requirement of calculating personnel than higher
The computation process of transmission of electricity nargin is a process of constantly adjusting, and needs the calculating personnel to have higher specialized capability, more rich practical experience and more skilled adjustment capability.
3, computing velocity is slower, expends a large amount of manpowers
Transmission of electricity nargin need be calculated each section, constantly carries out flow data adjustment and stability Calculation in the computation process, and calculated amount is bigger.And the working method of employing unit serial in the practical work process, the time of calculating is also long.
Summary of the invention
The problem to be solved in the present invention provides a kind of method and system of the online transmission of electricity nargin of calculating transmission cross-section based on the large-scale parallel algorithm.
In order to address the above problem, the system of the online transmission of electricity nargin of a kind of calculating based on parallel algorithm of the present invention comprises:
Administrative section is responsible for calculation task is distributed, and the result that computing node is returned carries out finishing analysis, generates new calculation task and result of calculation;
Calculating section is responsible for section is controlled to the gear of appointment, uses the stability Calculation program to check, and generates result calculated, and the result of the whole calculation tasks of computing node is aggregated into a file.
Another aspect of the present invention provides the computing method of the online transmission of electricity nargin of a kind of calculating based on parallel algorithm, and described method comprises the steps:
1) administrative section generates the control documents of calculation task;
2) calculating section calculates after obtaining calculation task, and after calculating finished result of calculation is returned;
3) administrative section is analyzed result of calculation, divides and checks the control documents that gear generates checking task;
4) after calculating section obtains checking task, adjust computing system stability; After calculating is finished result of calculation is returned;
5) result of calculation of all gears of administrative section is analyzed, and determines to be transmission of electricity nargin to checking all stable gear of failure system.
The present invention is based on the real-time power network data of actual acquisition,, adopt large-scale parallel computing technology that the transmission of electricity nargin of specifying section is carried out the limit automatically and calculate in conjunction with preestablishing and determining to adjust principle and method in real time based on safe and stable mode; Improve computing velocity to reach, truly reflect the purpose of electrical network actual conditions, be used for better instructing the actual motion of electrical network.
Figure of description
Fig. 1 is the system architecture synoptic diagram that the present invention is based on the online transmission of electricity nargin of calculating of parallel algorithm;
Fig. 2 is that this sends out described based on the process flow diagram of the computing method of the online transmission of electricity nargin of the calculating of parallel algorithm;
Fig. 3 is for realizing the process flow diagram of step 1) described in Fig. 2;
Fig. 4 is for realizing step 2 described in Fig. 2) process flow diagram;
Fig. 5 is for realizing the process flow diagram of step 3) described in Fig. 2;
Fig. 6 is for realizing the process flow diagram of step 4) described in Fig. 2;
Fig. 7 is the synoptic diagram of search phase algorithm in the parallel algorithm of the present invention;
Fig. 8 is the synoptic diagram of verification stage algorithm in the parallel algorithm of the present invention.
Specific embodiment
Describe the preferred embodiments of the present invention in detail below in conjunction with accompanying drawing.
As shown in Figure 1, it is the system architecture synoptic diagram that the present invention is based on the online transmission of electricity nargin of calculating of parallel algorithm, by showing as can be known among the figure that described system comprises:
Calculating section 02 is responsible for section is controlled to the gear of appointment, uses the stability Calculation program to check, and generates result calculated, and the result of the whole calculation tasks of computing node is aggregated into a file.
And for example Fig. 2 is described, and the method that the present invention requires to protect the online transmission of electricity nargin of the calculating based on parallel algorithm of certificate comprises the steps:
1) administrative section generates the control documents of calculation task;
2) calculating section calculates after obtaining calculation task, and after calculating finished result of calculation is returned;
3) administrative section is analyzed result of calculation, divides and checks the control documents that gear generates checking task;
4) after calculating section obtains checking task, adjust computing system stability; After calculating is finished result of calculation is returned;
5) result of calculation of all gears of administrative section is analyzed, and determines to be transmission of electricity nargin to checking all stable gear of failure system.
Further, as shown in Figure 3, described step 1) also includes following steps:
11) administrative section is obtained calculating the assessment result of fault;
12) according to the participation factors of all generators of EEAC quantitative analysis Theoretical Calculation;
13) discern a system oscillation group of planes under this safe and stable mode automatically;
14) determine adjustment modes according to preassigned unit;
15) control documents of generation calculation task
Wherein, the EEAC theory is to be based upon on the actual disturbed track of multi-computer system, is applicable to the big stability for disturbance assessment of multi-computer system and asking for of any parameter ultimate value.
EEAC will assess the space and separate from the integration space.It carries out complete numerical simulation to the whole dynamic equations that have any complex model and complex scene in the multimachine space earlier, whole disturbed tracks is decomposed into complementary two groups in the limit mode.For each complementary dividing mode, constitute the disturbed track of equivalent Non-Self-Governing two machine relative motions with the equivalent track at two groups of equivalent separately inertia centers.Its conversion of adopting is called complementation group center relative motion conversion (Complementary-Cluster Center-Of-Inertia Relative-Motion is abbreviated as CCCOI-RM).This linear transformation has not only intactly kept the stable information of former multimachine space, and is a kind of steady conversion of guarantor of strictness.
EEAC is different from liapunov's method fully, the qualitative information and the quantitative information of its direct extraction system stability from the actual disturbed track of electric system, and its main points are:
Be based upon the complementation group relative motion and shine upon the stability of having preserved former multi-computer system with the notional CCCOI-RM of group's rotor angle weighted mean;
Law of equal areas is extended to the map OMIB system that has time-varying characteristics on each image plane, and tries to achieve the latter's stability limit condition;
The critical condition of the most dangerous map subsystem is exactly the stability limit condition of former multi-computer system.
Therefore on the implication of multimachine integral accuracy, EEAC is a quantization method of analyzing the strictness of stability of power system.
Further, as shown in Figure 4, described step 2) also include following steps:
21) after calculating section obtains calculation task, from control documents, read the target value that group of planes information, section information and section power need be controlled;
22) adjustment principle and the method fixed according to the calculation task document, the running status of each element of Adjustment System makes the power of transmission cross-section reach this gear;
23) calculate the system stability of calculating fault under this power gear;
24) after calculating is finished result of calculation is returned administrative section.
Further, as shown in Figure 5, described step 3) also includes following steps:
31) administrative section is analyzed the result of calculation of all gears of recovery, the power gear of judgement system transmission of electricity nargin;
32) according to the transmission of electricity nargin and the search lower limit of section, divide and check gear, generate the control documents of checking task.
Further, as shown in Figure 6, described step 4) also includes following steps:
41) after calculating section obtained checking task, the running status of each element of Adjustment System made the power of transmission cross-section reach the check gear, calculated the system stability of checking fault under this method of operation; After after calculating is finished result of calculation being returned calculating section and obtaining checking task, the running status of each element of Adjustment System makes the power of transmission cross-section reach the check gear;
42) calculate the system stability of checking fault under this method of operation;
43) after calculating is finished result of calculation is returned.
Further, parallel calculating method is the core of this method in technical scheme of the present invention, and this algorithm is divided into two stages: search phase and verification stage.
Described search phase algorithm is illustrated in fig. 7 shown below, upper and lower bound according to given section through-put power search, be divided into N gear, use F fault, each section forms N * F calculation task like this, and a plurality of sections form Ni * Fi task of ∑, distributing to computing node calculates, reclaim result calculated, give supervisory routine and carry out Macro or mass analysis, find out the limit of section transmission power.So far finish the limit search phase, if there is the verification fault, program enters the verification stage.The upper limit of section through-put power search is got the thermally-stabilised limit of section N-1, and lower limit is got the limit of section calculated off-line and reduced two grades numerical value.
Described verification stage algorithm is illustrated in fig. 8 shown below, and it is based upon on the basis of search phase result of calculation.The at first LIMIT RESULTS that searches out according to each section, search lower limit and step-size in search calculate the check gear of each section;
Be divided into N like this and check gear, use F to check fault, each section forms N * F calculation task, a plurality of sections form Ni * Fi task of ∑, distribute to computing node and calculate, and platform reclaims result calculated, giving supervisory routine analyzes the result of calculation of front, generate final result of calculation, give computing platform, notification platform finishes whole nargin calculation task simultaneously.
Mainly carry out the unit output adjustment in the parallel computation process, section tidal current is controlled to appointment numerical value, then use stability program to calculate, the result of verification is stablized in output.The basic calculating process is as follows:
(1), from the calculation task message file, extracts the descriptor of calculation task according to the management task number given of host process and present located calculation stages number.
(2) information of the extraction section that calculates, a section both sides group of planes and adjustment principle and method and fault from the calculation task file; According to the shelves item of hunting zone, gear number and current task, find out the desired value of section tidal current;
(3) section tidal current is regulated.When the initial start-up trend is calculated, the initial trend of initialization section, operating states of the units or the like information; Then equilibrator is exerted oneself and carries out verification,, will adjust unit output if operate in non-allowed band, find rationally till;
(4) judge whether section tidal current reaches desired value,, then adjust section both sides unit output, repeat the step (3) of the trend governing loop of front, till reaching the reference mark if do not reach.
(5) stable verification.
(6) after calculating was finished, output result of calculation was finished calculation task.
Based on the scheduling flow of the nargin of massively parallel processing assessment is by being initiated by the dispatching platforms server, and main flow process is as follows:
(1) the dispatching platforms server transmits control signal to transmission of electricity nargin supervisory routine;
(2) after supervisory routine received signal, program was prepared the calculation task file, sent message to the dispatch server program, informed that its data are ready to complete;
(3) after dispatch server receives signal, relevant file is broadcast to each computing node;
(4) after the server of computing node receives file, read calculation task, and distribute to the thread of a plurality of calculation tasks one by one;
(5) after each computational threads receives task number, number extract the calculation task descriptor of oneself respectively according to task number and calculation stages;
(6) enter initial phase, from control documents, read group of planes information, section information respectively, calculate the target value of section power of oneself control; According to the flow direction of initial trend, the controlling party of determining trend to;
(7) after calculating is finished, form the result of calculation file.The calculation task thread sends back to the computing node host process with file after finishing, and after the computing node host process gathered these results, dispatch server was given in passback;
(8) dispatch server is collected neat destination file and is preserved.
(9) if there is no calculation task calculates and finishes, output result of calculation; If also there is other calculation task, repeat each step of this flow process (1)-(9).
The process in verification stage is identical with the procedural interface of search phase.Just there are some differences in the internal processing program of calculation stages thread and supervisory routine.Transmission of electricity nargin supervisory routine is after the result is finished in analysis, and output result of calculation finishes whole calculation task.
Further, the distribution of calculation task is determined by what and computing platform computing power of calculation task.For some reason, available node also changes, and the task of being pre-assigned to each computing node also should change.The number of calculation task is decided by the number of faults of gear number, search and the check of the number of calculating section, each section search.The platform that program is relied on adopts and carries out the Distribution Calculation task by the form of assignment file.Management node reads configuration file, can dynamically generate the calculation task file with the number of computing node according to search or check stage, specifies the calculation task of each computing node; Each computing node is discerned current calculation task by reading assignment file.
The method of Task Distribution: in the search phase, if the number of calculation task is greater than the number of available computing node, then increase the step-size in search of the less section in search volume, reduce the section number of gear, the number of corrected Calculation task makes it smaller or equal to available computing node number; If the number of calculation task less than the number of available computing node, then reduces the step-size in search of the bigger section in search volume, increase the section number of gear, the number of corrected Calculation task makes it near available computing node number.In the check stage, if the number of calculation task greater than the number of available computing node, then successively for each section, from the section limit that searches out, downward Distribution Calculation node one by one is till available computing node has assigned.
In a preferred embodiment of the present invention, the applicant is applied to technical scheme of the present invention in online stability analysis and the early warning system, and realization flow wherein is as follows:
(1) at interval (for example 10 minutes) at regular intervals obtain the real time data of an electrical network, integrate the available data that become specified format;
(2) dispatch server starts the software module of the technical program;
(3) supervisory routine of the technical program is prepared data such as calculation task file; By dispatch server relevant file is broadcast to each computing node; Each calculates the joint distribution and starts each calculation task thread, the i.e. calculating section of the technical program;
(4) the technical program calculation procedure carries out necessary initialization, and beginning is adjusted trend according to the parallel calculating method in this programme, carries out calculating such as stability Calculation analysis.
(5) after calculating was finished, result of calculation was returned dispatch server and is gathered.
(6) result of calculation is shown to the yardman, specifies the actual motion work of electrical network.
Characteristics of the present invention and function are as follows:
1) adopt parallel algorithm, taken full advantage of computer cluster technology, the powerful computing capability of performance cluster, Realize the fast search of section transmission of electricity nargin;
2) according to the early warning assessment result, can automatically identify the system oscillation group of planes under the different safe modes, determine Optimum adjustment mode.
3) consider machine unit characteristic: every unit has one, and the scope of rationally exerting oneself is lower than lower prescribing a time limit, and must shut down. Because after unit output was adjusted, the method for operation changed, the via net loss of system also can change, Exerting oneself of balancing machine may exceed zone of reasonableness. This program has the function that calibrating balancing machine is exerted oneself. Have A little units possibilities are long start-up time, these units can be set in the program only have when operation just passable Adjustment is exerted oneself, and does not allow to start unit.
4) realize carrying out the start-stop unit by power plant: allow to adjust unit output according to power plant, guarantee the minimum of power plant Exert oneself, and share with minimum unit and to exert oneself. Current as long as be used for the unit output adjustment of hydroelectric power plant.
5) consider influencing each other and restricting between the different transmission cross-sections of interregional grid, designed other section phases Close the check stage of fault. The check stage is based upon on the basis of search phase result of calculation, according to The LIMIT RESULTS that cross sections searches out, search lower limit and step-size in search, the check of calculating cross sections Gear, select to all check failure systems all stable maximum gear as the power limit of this section.
In addition, in the practice process, can also take other a kind of method of calculating online transmission of electricity nargin, described method comprises the steps:
101) get the operation of power networks number of the reality that satisfies electric power system tide, Stability Numerical Analysis program format According to;
102) the administrative section program is accepted the signal of startup, the early-stage preparations worker who finishes calculation task, data etc. Do;
103) after calculating section obtains calculation task, from control documents, read group of planes information, section information, Calculate the target value of the section power of oneself controlling;
104) all sections are all repeated following calculating:
Failure mode at the search phase of appointment adopts adopts parallel computing, and a plurality of faults are carried out the parallel computation analysis, calculates the stability of each each failure system of power gear;
105) after calculating was finished, calculating section gathered all result of calculations and returns.
Claims (13)
1, the system of the online transmission of electricity nargin of a kind of calculating based on parallel algorithm is characterized in that described system comprises:
Administrative section is responsible for calculation task is distributed, and the result that computing node is returned carries out finishing analysis, generates new calculation task and result of calculation;
Calculating section is responsible for section is controlled to the gear of appointment, uses the stability Calculation program to check, and generates result calculated, and the result of the whole calculation tasks of computing node is aggregated into a file.
2, the method for the online transmission of electricity nargin of a kind of calculating based on parallel algorithm is characterized in that described method comprises the steps:
1) administrative section generates the control documents of calculation task;
2) calculating section calculates after obtaining calculation task, and after calculating finished result of calculation is returned;
3) administrative section is analyzed result of calculation, divides and checks the control documents that gear generates checking task;
4) after calculating section obtains checking task, adjust computing system stability; After calculating is finished result of calculation is returned;
5) result of calculation of all gears of administrative section is analyzed, and determines to be transmission of electricity nargin to checking all stable gear of failure system.
3, the method for the online transmission of electricity nargin of the calculating based on parallel algorithm as claimed in claim 2 is characterized in that described step 1) also further comprises the steps:
11) administrative section is obtained calculating the assessment result of fault;
12) according to the participation factors of all generators of EEAC quantitative analysis Theoretical Calculation;
13) discern a system oscillation group of planes under this safe and stable mode automatically;
14) determine adjustment modes according to preassigned unit;
15) control documents of generation calculation task.
4, the method for the online transmission of electricity nargin of the calculating based on parallel algorithm as claimed in claim 3 is characterized in that described step 2) also further comprise the steps:
21) after calculating section obtains calculation task, from control documents, read the target value that group of planes information, section information and section power need be controlled;
22) adjustment principle and the method fixed according to the calculation task document, the running status of each element of Adjustment System makes the power of transmission cross-section reach this gear;
23) calculate the system stability of calculating fault under this power gear;
24) after calculating is finished result of calculation is returned administrative section.
5, the method for the online transmission of electricity nargin of the calculating based on parallel algorithm as claimed in claim 4 is characterized in that described step 3) also further comprises the steps:
31) administrative section is analyzed the result of calculation of all gears of recovery, the power gear of judgement system transmission of electricity nargin;
32) according to the transmission of electricity nargin and the search lower limit of section, divide and check gear, generate the control documents of checking task.
6, the method for the online transmission of electricity nargin of the calculating based on parallel algorithm as claimed in claim 5 is characterized in that described step 4) also further comprises the steps:
41) after calculating section obtained checking task, the running status of each element of Adjustment System made the power of transmission cross-section reach the check gear, calculated the system stability of checking fault under this method of operation; After after calculating is finished result of calculation being returned calculating section and obtaining checking task, the running status of each element of Adjustment System makes the power of transmission cross-section reach the check gear;
42) calculate the system stability of checking fault under this method of operation;
43) after calculating is finished result of calculation is returned.
7, the method for the online transmission of electricity nargin of the calculating based on parallel algorithm as claimed in claim 6 is characterized in that, described computing method are parallel calculating method, and described parallel calculating method is divided into two stages: search phase and verification stage.
8, the method for the online transmission of electricity nargin of the calculating based on parallel algorithm as claimed in claim 7 is characterized in that, the described search phase comprises the steps:
61) according to the upper and lower bound of given section through-put power search, be divided into N gear, use F fault, thereby form a plurality of calculation tasks;
62) described Task Distribution is calculated to computing node;
63) reclaim result calculated, give supervisory routine and carry out Macro or mass analysis, find out the limit of section transmission power;
64) judge whether to exist the verification fault, if exist, then the program of entering enters the verification stage.
9, the method for the online transmission of electricity nargin of the calculating based on parallel algorithm as claimed in claim 8 is characterized in that, the upper limit of described section through-put power search is got the thermally-stabilised limit of section N-1, and lower limit is got the limit of section calculated off-line and reduced two grades numerical value.
10, the method for the online transmission of electricity nargin of the calculating based on parallel algorithm as claimed in claim 8 is characterized in that, the described verification stage comprises the steps:
71) LIMIT RESULTS that at first searches out, search lower limit and step-size in search according to each section, using formula (1) calculates the check gear of each section;
72) be divided into N and check gear, use F to check fault, thereby form a plurality of calculation tasks;
73) distribute to computing node and calculate, platform reclaims result calculated, gives supervisory routine the result of calculation of front is analyzed;
74) generate final result of calculation, give computing platform, notification platform finishes whole nargin calculation task simultaneously.
11, the method for the online transmission of electricity nargin of the calculating based on parallel algorithm as claimed in claim 8 is characterized in that described step 62) in the method for allocating task, further comprise the steps:
81) whether the number of judging described calculation task greater than the number of available computing node, if greater than, then skip to step 83) continue to carry out;
82) increase the step-size in search of the less section in search volume, reduce the section number of gear, the number of corrected Calculation task makes it smaller or equal to available computing node number, and finishes the work of allocating task;
83) reduce the step-size in search of the bigger section in search volume, increase the section number of gear, the number of corrected Calculation task makes it near available computing node number, and finishes the work of allocating task.
12, the method for the online transmission of electricity nargin of the calculating based on parallel algorithm as claimed in claim 10, it is characterized in that, described step 73) method of allocating task in, if the number of calculation task is greater than the number of available computing node, then successively for each section, from the section limit that searches out, downward one by one Distribution Calculation node is till available computing node has assigned.
13, the method for the online transmission of electricity nargin of a kind of calculating based on parallel algorithm is characterized in that described method comprises the steps:
101) obtain the operation of power networks data of the reality that satisfies electric power system tide, stability Calculation routine analyzer form;
102) the administrative section program is accepted the signal of startup, finishes the preliminary preparation of calculation task, data etc.;
103) after calculating section obtains calculation task, from control documents, read group of planes information, section information, calculate the target value of section power of oneself control;
104) all sections are all repeated following calculating:
Adjust flow data: according to preassigned adjustment principle and method, at each gear power, the running status of adjusting each element of electric system makes the power of transmission cross-section reach this gear, obtains a plurality of reasonable Operation Mode data;
105) after calculating was finished, calculating section gathered all result of calculations and returns.
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| CN103593724A (en) * | 2013-08-30 | 2014-02-19 | 国家电网公司 | Task ranking system for electric power system operating state online/offline evaluation hybrid scheduling |
| CN103577685A (en) * | 2013-08-30 | 2014-02-12 | 国家电网公司 | Electric system running state online and offline estimation hybrid scheduling system |
| CN103955400A (en) * | 2014-04-17 | 2014-07-30 | 国网宁夏电力公司 | Online checking method of parallel computing in electrical power system |
| CN108804386A (en) * | 2018-07-09 | 2018-11-13 | 东北电力大学 | A kind of parallelization computational methods of power system load nargin |
| CN108804386B (en) * | 2018-07-09 | 2022-03-29 | 东北电力大学 | Parallelization calculation method for load margin of power system |
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