CN101826752A - Backup power automatic switching device action simulation method in self-adaptive electric network operation mode - Google Patents
Backup power automatic switching device action simulation method in self-adaptive electric network operation mode Download PDFInfo
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Abstract
The invention discloses a backup power automatic switching device action simulation method in a self-adaptive electric network operation mode, which comprises the following steps: carding the strategies of a backup power automatic switching device; organizing the backup power automatic switching control strategy structure through a logic expression formed by a work bus and a backup supply switch; judging whether an electric island can be newly added or not after the switch is switched on or switched off according to the topology connection characteristics of both ends of an expected switching-on and switching-off switch; carrying out topology coloring again on the switched-on or switched-off electric network for recognizing the charge state of the work bus and the backup supply switch; obtaining the backup power automatic switching control strategy according to the charge state matching; executing the action delay maximum control strategy in the matched strategies, breaking corresponding main supply switches, closing the backup supply switch, and adopting corresponding overload linkage cut according to the load transfer condition and the rated power of equipment; and carrying out the topology coloring on the electric network with the closed backup supply switch for thus determining the charge state of the work bus and the backup supply switch. The invention considers the overload linkage cut and the selection of multiple backup supply switches caused by load transfer, so the practicability of the method is greatly improved.
Description
Technical field
The present invention relates to a kind ofly towards the electrical power system on-line safety and stability analysis, the backup auto-activating device action simulation method of self adaptation power system operating mode belongs to the Power System and its Automation technical field.
Background technology
As the important measures that guarantee the reliable power supply of area power grid, backup auto-activating device has obtained extensive use at area power grid radially.When electrical network breaks down and when causing bus to have a power failure, the backup auto-activating device that satisfies the input condition will move, thereby reduces possibility that bus has a power failure greatly, has guaranteed the reliability of powering.Therefore, when area power grid carries out the safety on line stability analysis, need to consider the action of backup auto-activating device, to determine after the accident whether safety of electrical network.If do not consider that then the result directly causes load rejection often, do not meet the reality of operation of power networks.
At present, prepared auto restart analogy method towards the electricity net safety stable analysis has two kinds, a kind of is at each forecast failure a series of switch motion to be set to simulate backup auto-activating device, as document one (Chen Yong, consider the design of area power grid static security analysis and application, Automation of Electric Systems, 2004 of prepared auto restart, 19 (5): 84-87,99.); Another kind is to set up working bus bar and be equipped with the contingency table that supplies switch, utilize the following working bus bar of topological analysis identification forecast failure, be equipped with the electriferous state of confession switch, consider the cooperation of the different operation time limits of a plurality of backup auto-activating devices, to simulate actual prepared auto restart action, (Yang Yong considers the area power grid static security analysis software development of automatic throw-in equipment of emergency power supply, Guangdong Electric Power as document two, 2009,8 (5): 57-61.).
First method realizes simple, at each forecast failure a series of switch motion is set in advance, one has increased the workload that analytical calculation is safeguarded greatly, two because the real-time change of operational mode, certain fault that is difficult to know for sure in advance can cause the action of which prepared auto restart, so be difficult to contain various prepared auto restart action scenes.Second method has significantly than first kind to be improved, but still there is following limitation: the one, the real-time aspect, owing to adopt the full mesh topology analysis to determine the electriferous state of the working bus bar under the forecast failure, the real-time of topological analysis has directly influenced the real-time that the prepared auto restart action is judged; The 2nd, being equipped with under the switch situation that a plurality of heat are equipped with, considered to exist in switch simulation aspect, how correctly to select to be equipped with the problem that supplies switch; The 3rd, the action simulation aspect, do not consider that prepared auto restart action causes load transfer after, the problem that the overload connection that may cause is cut.
Summary of the invention
The object of the invention is to overcome the deficiency of existing method, a kind of backup auto-activating device action simulation method of the self adaptation power system operating mode of analyzing towards electrical power system on-line safety and stability has been proposed, can be in the extremely short time need the prepared auto restart strategy taked automatically under the coupling forecast failure, for the security and stability analysis of area power grid provides real scene.
The technical solution adopted for the present invention to solve the technical problems is as follows: the backup auto-activating device strategy is carried out combing, by working bus bar, be equipped with the logical expression organizational politics structure that constitutes for switch; Cut-off at the anticipation equipment under the real-time mode, the equipment electriferous state after cut-offfing by topology coloring identification under the new operational mode mates the prepared auto restart control strategy fast in the policy construction of organizing.
Technical scheme of the present invention comprises following steps:
1) the backup auto-activating device strategy is carried out combing, by working bus bar, be equipped with the logical expression organizational politics structure that constitutes for switch; 2),, split the electrical network of having no progeny and carry out topology coloring, with the identification working bus bar, fully for the switch electriferous state according to the two ends topology connection characteristics that switch is cut-off in anticipation based on electric power system real time execution situation; 3) obtain the prepared auto restart control strategy according to working bus bar, the electriferous state coupling that is equipped with for switch; 4) control strategy of action delay minimum in the execution institute matching strategy, tripping is main accordingly for switch, close and be equipped with for switch, and take corresponding overload to join according to the rated power of load transfer situation and equipment and cut, the electrical network that is equipped with after closing for switch is carried out topology coloring, thereby determine working bus bar, be equipped with for the switch electriferous state; 5) circulation step 3) to step 4), till the prepared auto restart control strategy that does not have coupling.
Above-mentioned steps 1) in, follow convenient and practical principle, by working bus bar, be equipped with the logical expression that constitutes for switch and organize prepared auto restart Policy Table structure, form the prepared auto restart Policy Table, form as: Bzt (Buss, RBrks).Wherein: Buss represents the working bus bar electriferous state, and wherein 1 expression is charged, and 0 expression is not charged; RBrks represents to be equipped with the electriferous state for switch, and 1 expression is charged, and 0 expression is not charged.The prepared auto restart action policy calculates by following formula:
Bzt(Buss，RBrks)＝(！Buss)&RBrks
Expression NOT operation ， ﹠amp; The expression AND operation.If the formula return value is 1, then the backup auto-activating device tripping is main for switch, and closing is equipped with for switch; Be 0, then do not take action.For there being a plurality of situations about being equipped with for switch, by being set, each is equipped with the priority that supplies switch, and what the priority of closing during simulation was the highest is equipped with for switch.
Above-mentioned steps 2) in, discern working bus bar, supply the electriferous state of switch to comprise following steps fully by topology coloring:
(1) switch that equipment connects is cut-off in the tripping anticipation, and v carries out deep search by a certain end physical node of switch, and idiographic flow is as follows:
A) the initial physical node v of visit, and be labeled as and visit;
B) switch, the disconnecting link with closure is the path, searches the physical node w that links to each other with this physical node; C) if w is not accessed, then visit physical node w and mark w for visiting;
D) be starting point with w, search the next coupled physical node w1 that links to each other with w;
E) forward step b) to, till the physical node of all connections is all visited.
If in ergodic process, can search the other end physical node of switch, then do not increase computing node number; Otherwise then newly-increased computing node is a starting point with newly-increased computing node, carries out deep search, and idiographic flow is as follows:
A) visit initial calculation node V, and be labeled as and visit;
B) be the path with circuit, winding, series compensation equipment, search the computing node W that links to each other with this computing node;
C) if W is not accessed, then visit computing node W and mark W for visiting;
D) be starting point with W, search the next coupled computing node W1 that links to each other with W;
E) forward step b) to, till the computing node of all connections is all visited.
If can search the computing node of the switch other end, then not newly-increased electric island; Otherwise, newly-increased electric island.Have only under the situation on newly-increased electric island, the electriferous state of primary equipment might change, and just needs again the whole network to be carried out topological analysis.Can effectively reduce the number of times that full mesh topology is analyzed by above-mentioned judgement, significantly improve recognition speed.
(2) whether according to existing power supply to determine the electriferous state of equipment in the island in the electric island, if having power supply in the island, then equipment is charged in the island; Otherwise equipment is not charged in the island;
(3) according to working bus bar, be equipped with for the electric island under the switch and determine its electriferous state, if the electric island at working bus bar place is not charged, then think the working bus bar dead electricity; Supply switch one end and working bus bar on same electric island if be equipped with, electric island, other end place is charged, judges that then this switch satisfies heat and is equipped with condition.
Above-mentioned steps 3) in, is: 1) working bus bar dead electricity whether according to working bus bar, the concrete steps that are equipped with for the electriferous state coupling prepared auto restart control strategy of switch; 2) if working bus bar dead electricity is not then taked control strategy, finish this prepared auto restart control strategy matching process; 3) if whether the working bus bar dead electricity is then judged charged for switch fully; 4) if not charged for switch fully, do not take control strategy; 5) if charged for switch fully, then obtain the prepared auto restart control strategy.
Above-mentioned steps 4) in, according to the prepared auto restart strategy of action delay minimum, select the highest heat of priority to be equipped with for switch and close, and take corresponding overload connection to cut measure according to the rated power of load transfer situation and equipment, the excision amount is:
P wherein
iBy working bus bar before the fault the through-put power of company's power supply unit, Pn
jRated power for prepared auto restart action back power supply unit.
Based on physical node and switch, disconnecting link state in the station, search out computing node, according to the computing node of the whole network, discern each working bus bar, be equipped with electriferous state again for switch by topology coloring.
Above-mentioned steps 5) in, under the new mode after the prepared auto restart action action, circulation step 3) to step 4), thus considered the situation that different sequential prepared auto restarts cooperatively interact in the real system.
Beneficial effect of the present invention is that a kind of backup auto-activating device action simulation practical approach of self adaptation power system operating mode is provided.By the anticipation that the local topology that fault is caused changes, only under the situation on newly-increased electric island, carry out the full mesh topology analysis again, thereby significantly improved recognition speed; On the elementary tactics basis of simulation prepared auto restart, further considered that the overload that load transfer causes in real system connection is cut and the selection problem that is equipped with for switch more, thereby improved the practicality of method greatly.
Description of drawings
Fig. 1 is the network topological diagram of area power grid
Fig. 2 is for being equipped with flow chart of the present invention
Fig. 3 is the topology coloring flow chart
Fig. 4 is three common class prepared auto restart winding diagrams.
Embodiment
With reference to the accompanying drawings and in conjunction with example the present invention is described in further detail.But the invention is not restricted to given example.
As shown in Figure 1, station STA1 of factory and the station STA2 of factory all are equipped with prepared auto restart, and under the initial mode, the station STA1 of factory is by circuit L1 power supply, and circuit L4 heat is equipped with; The station STA2 of factory is by circuit L3 power supply, and circuit L2 heat is equipped with.Consider the necessity that different action delay prepared auto restarts cooperatively interact for explanation, enumerated two cover action delay schemes below.
Scheme one, the action delay of factory's station STA1 prepared auto restart is 3 seconds, the action delay of factory's station STA2 prepared auto restart is 5 seconds.The concrete steps of prepared auto restart simulation are as follows:
(1) the prepared auto restart strategy of factory station STA1 may be defined as:
Bzt(bus1s，brk2s)＝(！bus1s)&brk2s，
The prepared auto restart policy definition of the station STA2 of factory is:
Bzt(bus2s，brk4s)＝(！bus2s)&brk4s，
(2) after circuit L1 anticipation is cut-off, by topology coloring as can be known, the equal dead electricity of working bus bar of station STA1 of factory and the station STA2 of factory, the station STA1 of factory is in the hot state that is equipped with for being equipped with for switch brk4 of switch brk2 and the station STA2 of factory fully.bus1s＝0，brk2s＝1，bus2s＝0，brk4s＝1。
(3) substitution prepared auto restart policy definition formula can get
Bzt(bus1s，brk2s)＝(！0)&1＝1，
Bzt(bus2s，brk4s)＝(！0)&1＝1，
STA1, STA2 prepared auto restart all satisfy operation condition.
(4) at first carry out the prepared auto restart strategy of the less station STA1 of factory of time-delay, tripping switch brk1, the brk2 that closes, by L2 to factory's station STA1 power supply.Electrical network after the prepared auto restart action is carried out topology coloring as can be known once more, and factory's station STA2 working bus bar dead electricity (bus2s=0) is in heat for switch brk4 fully and is equipped with state (brk4s=1).
(5) the prepared auto restart strategy formula of substitution STA2 is as can be known:
Bzt (bus2s, brk4s)=(! 0) ﹠amp; 1=1, then needing to close is equipped with for switch brk4.
Scheme two, the action delay of factory's station STA1 prepared auto restart is 5 seconds, the action delay of factory's station STA2 prepared auto restart is 3 seconds.
The prepared auto restart simulation steps (1) of scheme two is identical with mode one to step (3), and difference is:
(4) at first carry out the prepared auto restart strategy of the less station STA2 of factory of time-delay, the brk4 that closes, by L4 to factory's station STA2 power supply.Electrical network after the prepared auto restart action is carried out topology coloring as can be known once more, and factory's station STA2 working bus bar charged (bus1s=1) is in heat for switch brk2 fully and is equipped with state (brk2s=1).
(5) the prepared auto restart strategy of substitution STA1 is as can be known:
Bzt (bus2s, brk4s)=(! 1) ﹠amp; 1=0, prepared auto restart need not action.
Claims (7)
1. the backup auto-activating device action simulation method of self adaptation power system operating mode is characterized in that: may further comprise the steps:
1) the backup auto-activating device strategy is carried out combing, by working bus bar, be equipped with the logical expression that constitutes for switch and organize prepared auto restart control strategy structure;
2),, judge after switch cut-offs whether can increase electric island newly according to the two ends topology connection characteristics that switch is cut-off in anticipation based on electric power system real time execution situation; Only under the situation on newly-increased electric island, just split the electrical network of having no progeny and carry out topology coloring again, with the identification working bus bar, fully for the switch electriferous state;
3) obtain the prepared auto restart control strategy according to working bus bar, the electriferous state coupling that is equipped with for switch;
4) control strategy of action delay minimum in the execution institute matching strategy, tripping is main accordingly for switch, and closing is equipped with for switch, and takes corresponding overload to join according to the rated power of load transfer situation and equipment and cut; The electrical network that is equipped with after closing for switch is carried out topology coloring, thereby determine working bus bar, be equipped with for the switch electriferous state;
5) circulation step 3) to step 4), till the prepared auto restart control strategy that does not have coupling.
2. the backup auto-activating device action simulation method of self adaptation power system operating mode according to claim 1, it is characterized in that the prepared auto restart control strategy structure in the step 1), by logical expression the prepared auto restart strategy is described, form Policy Table Bzt (Buss, RBrks), wherein Buss represents that working bus bar electriferous state, RBrks represent to be equipped with the electriferous state for switch, and wherein 1 expression is charged, and 0 expression is not charged; Bzt (Buss, RBrks)=(! Buss) ﹠amp; RBrks returns 1 as expression formula, and promptly working bus bar is not charged, is equipped with to supply switch charged, and expression need be closed and is equipped with for switch; Otherwise, do not take action.
3. the backup auto-activating device action simulation method of self adaptation power system operating mode according to claim 2, it is characterized in that, for there being a plurality of situations about being equipped with for switch, each then is set is equipped with the priority that supplies switch, what the priority of closing when simulation was the highest is equipped with for switch.
4. the backup auto-activating device action simulation method of self adaptation power system operating mode according to claim 1 is characterized in that step 2) in, discern working bus bar, supply the electriferous state of switch to comprise following steps fully by topology coloring:
1) switch that equipment connects is cut-off in tripping anticipation,, carry out deep search by a certain end physical node of switch, if can search the other end physical node of switch, then do not increase computing node number; Otherwise, then newly-increased computing node; With newly-increased computing node is starting point, carries out deep search, if can search plain computing node to the switch other end, and then not newly-increased electric island, otherwise newly-increased electric island; Have only when increasing electric island newly, just carry out the topological analysis in the network-wide basis again;
2) whether according to existing power supply to determine the electriferous state of equipment in the island in the electric island, if having power supply in the island, then equipment is charged in the island; Otherwise equipment is not charged in the island;
3) according to working bus bar, be equipped with for the electric island under the switch and determine its electriferous state.
5. the backup auto-activating device action simulation method of self adaptation power system operating mode according to claim 1, it is characterized in that in the step 3) that according to working bus bar, be equipped with the concrete steps that electriferous state coupling for switch obtains the prepared auto restart control strategy and be: (1) working bus bar is dead electricity whether; (2) if working bus bar dead electricity is not then taked control strategy, finish this prepared auto restart control strategy matching process; (3) if whether the working bus bar dead electricity is then judged charged for switch fully; (4) if not charged for switch fully, do not take control strategy; (5) if charged for switch fully, then obtain the prepared auto restart strategy.
6. the backup auto-activating device action simulation method of self adaptation power system operating mode according to claim 1, it is characterized in that in the step 4), prepared auto restart strategy according to the action delay minimum, selecting the highest heat of priority to be equipped with for switch closes, and take corresponding overload to join according to the rated power of load transfer situation and equipment and cut measure, the excision amount is:
P wherein
iBy working bus bar before the fault the through-put power of company's power supply unit, Pn
jRated power for prepared auto restart action back power supply unit; After closing a switch, based on physical node and switch, disconnecting link state in the station, search out computing node again, and then discern each working bus bar, be equipped with electriferous state for switch by topology coloring.
7. the backup auto-activating device action simulation method of self adaptation power system operating mode according to claim 1, it is characterized in that in the step 5), under the new mode after the prepared auto restart action action, circulation step 3) to step 4), thus considered the situation that different sequential prepared auto restarts cooperatively interact in the real system.
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