CN103595039B - The distributed cyclization risk analysis method of network system - Google Patents
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Abstract
The object of the present invention is to provide the distributed cyclization risk analysis method of a kind of network system, comprise and carry out dynamic partition process centered by 220kV bus, Tidal Simulation analysis more than 220kV electric pressure and following cyclization risk analysis analog computation, 220kV voltage.This method is run by ring network power supply mode for equipment more than 220kV electric pressure, the equipment of below 220kV electric pressure is pressed in the environment that radiation network runs, and the actual motion feature invention for area power grid provides a kind of distributed cyclization risk analysis processing method based on interrupter technique and Sub-region and hierarchical.The present invention aims to provide a general cyclization risk analysis method, and the cyclization simulated operation computing speed of 110kV and following electric pressure is improved greatly, and the stability simultaneously restrained obtains very large improvement.
Description
Technical field
The present invention relates to power system automatic field, relate in particular to a kind of distributed cyclization risk analysis processing method based on interrupter technique and Sub-region and hierarchical.
Background technology
Along with the development of electric power system and carrying out in a deep going way of Power grid commercial operation, the scheduling and controlling of electric power system becomes and becomes increasingly complex.The data acquisition that dispatch automated system is the most basic and monitoring function SCADA can not meet the requirement of traffic control, for improving the safety of electrical network, stable, high-quality and economic operation level, the electrical network advanced applied software PAS that can analyze electric network composition and real time data is more and more subject to the favor of management and running personnel, in the simulated operation of senior application, cyclization risk analysis is very important functional module, dispatcher in any real-time operation as cyclization, whether all will carry out simulated operation in advance before unlinking etc. with verification operation can cause the out-of-limit of busbar voltage, whether can cause the overload of circuit or transformer, loop power flow changing situation etc. after operation.But based on the Load flow calculation of the whole network often sometimes because the model in other sheet net or region is incomplete or the inaccurate cyclization analytical calculation to one's respective area impacts and maybe can not use, sometimes convergence also can receive impact, based on this, propose the distributed cyclization risk analysis method based on interrupter technique and Sub-region and hierarchical herein, make the cyclization simulated operation of local area not by the impact of other sheet net of system, stability is greatly improved.
Summary of the invention
The object of the present invention is to provide the distributed cyclization risk analysis method of a kind of network system, the method provides more general, stable computational methods for the cyclization simulated operation of area power grid 110kV and following electric pressure, the method is not subject to the impact of other sheet net by the subnet that interrupter technique and Dynamic partitioning techniques make plan operate, thus substantially increases the stability of calculating and improve computational speed.
Object of the present invention realizes by following technical measures:
The distributed cyclization risk analysis method of a kind of network system, comprises the whole network dynamic partition, subnet distributed cyclization risk analysis calculating, major network Load flow calculation three part computational process, wherein:
Described the whole network dynamic partition carries out dynamic partition process centered by 220kV bus, carries out topology process according to the ground state topological relation of electrical network and the real time position of switch, during process, 220kV main transformer uprised switch simulation and disconnect, the subregion that final formation is different.
The detailed process of described the whole network dynamic partition is: the dynamic partition determining the subregion of 500kV electric pressure major network and the subnet centered by 220kV bus according to the real-time topology relation of electrical network and the on off state of correspondence, need 220kV transformer to be uprised switch to disconnect when determining the subregion of 500kV electric pressure, need 220kV line switching to disconnect when determining the dynamic partition centered by 220kV bus, then 220kV bus and 500kV bus are set to balance node and carry out dynamic partition, final result is the corresponding subregion of each 220kV bus, the corresponding dynamic partition of 500kV bus.
Wherein dynamic partition with the 220kV bus in 220kV transformer station for root node, 220kV line switching is disconnected and blocks, search for downwards by depth-first search rule, search for all 110kV transformer stations of this 220kV transformer station band, using this 220kV transformer station and the 110kV transformer station that searches as a region.In general, how many 220kV transformer stations are had just to have how many districts.Carry out major network subregion after having determined subnet subregion, 220kV transformer is uprised switch simulation and disconnect, search element with any one 500kV bus for initial point carries out depth-first downwards, finally determine the major network dynamic partition comprising 500kV bus and 220kV bus.
Then, according to the information of the switch of the simulated operation provided, determine the dynamic partition belonging to it, in corresponding subregion, carry out the operation of the Tidal Simulation after cyclization.
The detailed process that the distributed cyclization risk analysis of described subnet calculates is: with the 220kV bus in the subregion of current sub network as balance node, the cyclization switch of intending carrying out simulated operation in Home Network is closed, start Load flow calculation, the power flow changing of the trend distribution situation obtaining equipment in this subregion especially on looped network.Owing to calculating the subregion only related among a small circle, be not subject to the influence on tidal flow of major network and other subregion, thus computational speed improves greatly, and computing time obviously shortens, and convergence is greatly improved.
First the switch of intending carrying out Loop Closing Operation is closed, and determine the subregion at switch place, computing node is obtained by topology process by switch junctions model, final electrical island information is determined again by node branch model, 220kV bus in this electrical island is set to balance node, because algorithm quicksort is faster than Newton method in arithmetic speed, PQ decomposition method is adopted for the tidal current analysis after the cyclization of subnet, finally obtain voltage phase angle and the Branch Power Flow of each node as calculated, the Power Flow Information of cyclization switch and the active reactive injection rate of balance node, thus can judge whether Loop Closing Operation can cause apparatus overload.
Described PQ method carries out corrected Calculation by following iteration form:
V
-1ΔP=B'VΔδ
V
-1ΔQ=B''ΔV
Wherein Δ P, Δ Q are respectively the meritorious of each iteration and idle correction, and B' is n-1 rank admittance battle array, and B'' is n-m rank admittance battle array (m is PV node number), and Δ δ, Δ V are respectively the phase angle of each iteration and the correction of voltage magnitude.V
-1for the inverse matrix of node voltage diagonal matrix.
Described major network Load flow calculation adopts the power after cyclization risk analysis simulated operation to the power on the 220kV border bus of the subregion carrying out cyclization simulated operation, to the power that the power of the 220kV border bus do not carried out in the subregion of simulated operation adopts bus current by the mode of equivalence, carry out the Load flow calculation of major network on this basis.
Finally, with the 5000kV bus in the subregion of current major network as balance node, adopt equivalence method to process to the injecting power on the bus of 220kV border and obtain the meritorious of border bus and idle injection rate, in major network, the node type of other node is constant, start Load flow calculation, thus obtain the trend distribution situation of main interior equipment.Only relate to the subregion of major network owing to calculating, process border bus by equivalence, thus achieve the decoupling zero process of major network and border netting, thus computational speed improves greatly, and computing time obviously shortens, and convergence is greatly improved.
The detailed process of described major network Load flow calculation is: the node injecting power first obtaining 220kV border bus, choose bus in 500kV to connect and occur maximum being set to balance node, computing node is obtained by topology process by switch junctions model, final island information is determined again by node branch model, because Newton method stability is strong, major network adopts Newton method to process, and finally obtains the voltage phase angle of each node and Branch Power Flow, Branch Power Flow thus can judge whether the equipment of major network can transship as calculated.
Described Newton method carries out corrected Calculation by following iteration form
Wherein Δ P, Δ Q are respectively the meritorious of each iteration and idle correction, and H, N, J, L are the Jacobian matrix of object, Δ δ, and Δ V is respectively the phase angle of each iteration and the correction of voltage magnitude.V
-1for the inverse matrix of node voltage diagonal matrix.
Accompanying drawing explanation
Fig. 1 is dynamic partition schematic diagram of the present invention;
Fig. 2 is that subnet cyclization sunykatuib analysis of the present invention calculates flow chart;
Fig. 3 is major network Load flow calculation flow chart of the present invention.
Embodiment
Below in conjunction with accompanying drawing and concrete enforcement, the present invention will be further described.
Suppose that the switch that will carry out simulating Loop Closing Operation is in the dynamic partition centered by 220kVC station.Computational process is as follows:
As Fig. 1, carry out the whole network dynamic partition: dynamic partition with the 220kV bus in 220kV transformer station for root node, 220kV line switching is disconnected and blocks, search for downwards by depth-first search rule, search for all 110kV transformer stations of this 220kV transformer station band, using this 220kV transformer station and the 110kV transformer station that searches as a region.As shown in Figure 1,220kVC station is a district with transformer station 1,2,3,4.In general, how many 220kV transformer stations are had just to have how many districts.Carry out major network subregion after having determined subnet subregion, 220kV transformer is uprised switch simulation and disconnect, search element with any one 500kV bus for initial point carries out depth-first downwards, finally determine the major network dynamic partition comprising 500kV bus and 220kV bus.
As Fig. 2, subnet cyclization sunykatuib analysis calculates: first closed by the switch of intending carrying out Loop Closing Operation, and determine the subregion at switch place, computing node is obtained by topology process by switch junctions model, final island information is determined again by node branch model, 220kV bus in the island proper is set to balance node, because PQ decomposition method is faster than Newton method in arithmetic speed, PQ decomposition method is adopted for the tidal current analysis after the cyclization of subnet, finally obtain voltage phase angle and the Branch Power Flow of each node as calculated, Branch Power Flow, the Power Flow Information of cyclization switch and the active reactive injection rate of balance node, thus can judge whether Loop Closing Operation can cause apparatus overload.
As Fig. 3, major network Load flow calculation: final major network subregion is the main partition comprising 220kV circuit and 220kV bus centered by 500kVA station, first the node injecting power of 220kV border bus is obtained, choose bus in 500kV to connect and occur maximum being set to balance node, computing node is obtained by topology process by switch junctions model, final island information is determined again by node branch model, because Newton method stability is strong, major network adopts Newton method to process, finally obtain voltage phase angle and the Branch Power Flow of each node as calculated, Branch Power Flow, thus can judge whether the equipment of major network can transship.
Embodiments of the present invention are not limited thereto; under stating basic fundamental thought prerequisite on the invention; according to the ordinary technical knowledge of this area and customary means to content of the present invention make the amendment of other various ways, replacement or change, all drop within rights protection scope of the present invention.
Claims (6)
1. the distributed cyclization risk analysis method of network system, is characterized in that: comprise the whole network dynamic partition, subnet distributed cyclization risk analysis calculating, major network Load flow calculation three part computational process, wherein:
Described the whole network dynamic partition carries out dynamic partition process centered by 220kV bus, carries out topology process according to the ground state topological relation of electrical network and the real time position of switch, during process, 220kV main transformer uprised switch simulation and disconnect, the subregion that final formation is different;
It is using the 220kV bus in the subregion of current sub network as balance node that the distributed cyclization risk analysis of described subnet calculates, the cyclization switch of intending carrying out simulated operation in Home Network is closed, start Load flow calculation, the power flow changing of the trend distribution situation obtaining equipment in this subregion especially on looped network;
Described major network Load flow calculation adopts the power after cyclization risk analysis simulated operation to the power on the 220kV border bus of the subregion carrying out cyclization simulated operation, to the power that the power of the 220kV border bus do not carried out in the subregion of simulated operation adopts bus current by the mode of equivalence, carry out the Load flow calculation of major network on this basis;
The detailed process of described the whole network dynamic partition is: the dynamic partition determining the subregion of 500kV electric pressure major network and the subnet centered by 220kV bus according to the real-time topology relation of electrical network and the on off state of correspondence, need 220kV transformer to be uprised switch to disconnect when determining the subregion of 500kV electric pressure, need 220kV line switching to disconnect when determining the dynamic partition centered by 220kV bus, then 220kV bus and 500kV bus are set to balance node and carry out dynamic partition, final result is the corresponding subregion of each 220kV bus, the corresponding dynamic partition of 500kV bus.
2. the distributed cyclization risk analysis method of network system according to claim 1, it is characterized in that: the detailed process of described the whole network dynamic partition is: wherein dynamic partition with the 220kV bus in 220kV transformer station for root node, 220kV line switching is disconnected and blocks, search for downwards by depth-first search rule, search for all 110kV transformer stations of this 220kV transformer station band, using this 220kV transformer station and the 110kV transformer station that searches as a region; Carry out major network subregion after having determined subnet subregion, 220kV transformer is uprised switch simulation and disconnect, search element with any one 500kV bus for initial point carries out depth-first downwards, finally determine the major network dynamic partition comprising 500kV bus and 220kV bus.
3. the distributed cyclization risk analysis method of network system according to claim 1, it is characterized in that: the detailed process that the distributed cyclization risk analysis of described subnet calculates is: first the switch of intending carrying out Loop Closing Operation is closed, and determine the subregion at switch place, computing node is obtained by topology process by switch junctions model, final electrical island information is determined again by node branch model, 220kV bus in this electrical island is set to balance node, PQ decomposition method is adopted for the tidal current analysis after the cyclization of subnet, finally obtain voltage phase angle and the Branch Power Flow of each node as calculated, the Power Flow Information of cyclization switch and the active reactive injection rate of balance node, thus can judge whether Loop Closing Operation can cause apparatus overload.
4. the distributed cyclization risk analysis method of network system according to claim 3, is characterized in that: described PQ decomposition method carries out corrected Calculation by following iteration form:
V
-1ΔP＝B'VΔδ
V
-1ΔQ＝B″ΔV
Wherein Δ P, Δ Q are respectively the meritorious of each iteration and idle correction, and B' is n-1 rank admittance battle array, B, and " be n-m rank admittance battle array, m is PV node number, and Δ δ, Δ V are respectively the phase angle of each iteration and the correction of voltage magnitude, V
-1for the inverse matrix of node voltage diagonal matrix.
5. the distributed cyclization risk analysis method of network system according to claim 1, is characterized in that:
The detailed process of described major network Load flow calculation is: the node injecting power first obtaining 220kV border bus, choose bus in 500kV to connect and occur maximum being set to balance node, computing node is obtained by topology process by switch junctions model, final island information is determined again by node branch model, because Newton method stability is strong, major network adopts Newton method to process, and finally obtains the voltage phase angle of each node and Branch Power Flow, Branch Power Flow thus can judge whether the equipment of major network can transship as calculated.
6. the distributed cyclization risk analysis method of network system according to claim 5, is characterized in that: described Newton method carries out corrected Calculation by following iteration form
Wherein Δ P, Δ Q are respectively the meritorious of each iteration and idle correction, and H, N, J, L are the Jacobian matrix of object, Δ δ, and Δ V is respectively the phase angle of each iteration and the correction of voltage magnitude; V
-1for the inverse matrix of node voltage diagonal matrix.
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| CN104008462A (en) * | 2014-06-16 | 2014-08-27 | 深圳供电局有限公司 | Reliability management information system and method covering high-voltage, medium-voltage and low-voltage customers |
| CN105207199B (en) * | 2015-09-08 | 2017-05-10 | 江苏省电力公司 | Partition power grid main supply element overload quantity filling method |
| CN106300337A (en) * | 2016-08-09 | 2017-01-04 | 国网浙江德清县供电公司 | Power distribution network partition method based on dynamic Decomposition method |
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