CN103529708B - The pre-operation analogue system of power distribution network and simulating analysis - Google Patents
The pre-operation analogue system of power distribution network and simulating analysis Download PDFInfo
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Abstract
The invention discloses a kind of pre-operation analogue system and simulating analysis of power distribution network, analogue system comprises high-speed simulation and starts module, pre-operation execution module, pre-operative analysis module, analysis result display module, carry out simulation analysis and Ying Feng and cross the summer when analyzing, simulation operations is carried out according to scheduling operation scheme, and distribution Load flow calculation and distribution risk assessment are carried out to simulation operations, the change of power distribution network related electric amount caused by simulation operations and the operation of power networks risk of increase or minimizing are shown by pre-operation emulation screen, and formed with real-time interface screen and contrast, security to electrical network after pre-operation is provided, reliability, economy affect object information, for yardman provides aid decision making.
Description
Technical field
The present invention relates to the simulation technical field of electrical power distribution automatization system, specifically, relate to a kind of pre-operation analogue system and simulating analysis of power distribution network.
Background technology
Power distribution network is the important component part of electric system, and its safe reliability will directly affect the national economic development and living standards of the people.The network of power distribution network is complicated, equipment amount is large, change is frequent, and this application function relevant to power distribution network network analysis causes many problems.Cause distribution scheduling person Accurate Analysis cannot go out the impact of scheduling operation on electrical network on the one hand; The operation prediction scheme that another aspect distribution scheduling personnel draft, not correct due to the change of the distribution method of operation.The scheduling operation of mistake is easy to cause user's dead electricity, reduces the reliability of electrical network.For ensureing the safe operation of electric system, higher requirement is proposed to the monitoring function of power distribution network traffic control, distribution automation maintainer quality and the function of electric system own.
Summary of the invention
The object of the present invention is to provide a kind of pre-operation analogue system of power distribution network and simulation analysis and Ying Feng to cross summer analytical approach, pre-operative analysis is done to scheduling operation scheme, obtains the risk that pre-operation may cause, for yardman provides aid decision making.
The technical solution used in the present invention is:
The pre-operation analogue system of power distribution network, is connected with electric power monitoring system, comprises following functions module:
High-speed simulation starts module, is responsible for initialization pre-operation analogue system, during startup, whether understand state belonging to detection high-speed simulation successively start, whether high-speed simulation function can be used, and successfully whether synchronistic model and data, if start successfully, then system shows real-time interface screen and pre-operation emulation screen simultaneously; If start unsuccessfully, then eject miscue dialog box, prompting failure cause;
Pre-operation execution module, is responsible for man-machine interaction, the simulation operations of receiving scheduling person;
Pre-operative analysis module, comprise distribution Load flow calculation and distribution risk assessment two functional modules, described distribution Load flow calculation module for add up power system operating mode change or adjustment after, the power load distributing on mains supply path, obtains the current value of each line switching; Described distribution risk evaluation module is used for power system operating mode and changes or after adjustment, carry out risk assessment to operation of power networks;
Analysis result display module, comprises real-time interface screen and pre-operation emulation screen, for by the change of power distribution network related electric amount caused by simulation operations and the risk of increase or minimizing, is shown by pre-operation emulation screen, and is formed with real-time interface screen and contrast.
Adopt the pre-operation analogue system of power distribution network to carry out the method for pre-operation simulation analysis, comprise the steps:
1) start pre-operation analogue system, initialization pre-operation analogue system, obtain the initialization data source of data as emulation of current electric grid in electric power monitoring system, and shown by real-time interface screen and pre-operation emulation screen;
2) yardman is according to pre-operation scheme, carries out simulation operations by pre-operation execution module, and simulation operations is mainly the opening and closing lock state changing switch in supply line, to change or to adjust the method for operation of electrical network;
3) by distribution Load flow calculation module to described step 2) simulation operations carry out distribution Load flow calculation, distribution Load flow calculation adopt load current superposition algorithm, be specially:
After 3-1) analogue system receives simulation operations instruction, obtain the displacement switch in supply line, after described displacement switch refers to simulation operations, opening of switch, conjunction state there occurs the switch of change;
3-2) defining between the power supply point of supply line and displacement switch is upstream supply path, is downstream supply path between displacement switch and load, utilizes topology search to obtain displacement switch downstream supply path;
If 3-3) pre-operation instruction is switch separating brake, then former on off state is for closing a floodgate, now the switching current value of upstream supply path reduces, reduce the current value that amplitude is displacement switch, the current value of described displacement switch is by distribution network master station system automatic acquisition, all devices dead electricity on the supply path of downstream, current value returns 0; Close a floodgate if pre-operation instruction is switch, then former on off state is separating brake, and the switching current value now on the supply path of upstream increases, and increase the current value that amplitude is displacement switch, the computing formula of the switching current value on the supply path of downstream is:
Wherein, I
brkfor the current value of the switch on the supply path of downstream, I
ldthe current value of the load on the supply path of downstream;
3-4) calculate the active power in supply line and reactive power, computing formula is as follows,
P=UIcosθ
Q=UIsinθ
Wherein, P is active power, and Q is reactive power, and U is line voltage, and I is line current, and θ is the angle of U and I;
The switching current value of upstream supply path 3-5) will calculated, the switching current value of downstream supply path, circuit active power and reactive power send telemetry intelligence (TELINT), are shown by pre-operation emulation screen, and are formed with real-time interface screen and contrast;
4) by distribution risk evaluation module to described step 2) simulation operations carry out operation of power networks risk assessment, described risk assessment comprises:
N-1 analyzes, and carries out topology search to a certain feeder line, if find other bus by the lane place line way switch within m, then this feeder line meets N-1 principle; If find other bus by 0 lane place line way switch, then line looped network runs, and add operation of power networks risk, described m sets according to actual conditions;
Heavy duty is analyzed, and the line current that goes out of line electricity source point exceedes circuit heavy duty threshold value, then circuit heavy duty, adds operation of power networks risk;
5) increase described step 4) analysis obtained or the operation of power networks risk of minimizing are shown, for yardman provides aid decision making by pre-operation emulation screen;
6) step 2 is repeated) to 5), until all pre-operation schemes all complete.
By adopting above-mentioned technological means, advantage of the present invention is: pre-operation analogue system provides distribution Load flow calculation function and distribution risk assessment function, distribution scheduling personnel are before carrying out scheduling operation to actual electric network, previewed by pre-operation analogue system, according to Load flow calculation and risk assessment, pre-operation is analyzed, whether verification scheduling operation is reasonable, whether can affect the safety and reliability of electrical network, and by diversified for analysis result exhibition method to distribution scheduling personnel, for yardman provides aid decision making; Distribution scheduling personnel can predict the impact of scheduling operation on electrical network in advance according to analysis result, select to perform, revise or abandon this scheduling operation, thus ensure safety, the reliability service of electrical network.
Figure of description
Fig. 1 is the framed structure schematic diagram of pre-operation simulation analysis of the present invention;
Fig. 2 is pre-operation analogue system Booting sequence figure of the present invention;
Fig. 3 is distribution tidal current analysis algorithm flow chart of the present invention;
Fig. 4 is the real-time interface screen of the present invention and pre-operation emulation screen contrast display schematic diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further details.
Whole electric power monitoring system needs the electrical network of reality to be abstracted into equipment concrete one by one such as switch, load, power supply etc., there is topological connection relation between these equipment.
As shown in Figure 1, pre-operation emulating operating system of the present invention is connected with electric power monitoring system, comprises 4 large modules: high-speed simulation starts module, pre-operation execution module, pre-operative analysis module, analysis result display module.
High-speed simulation starts module in charge initialization pre-operation analogue system, as shown in Figure 2, after high-speed simulation starts module startup, state belonging to high-speed simulation can be detected successively whether start, whether high-speed simulation function can be used, successfully whether, if start successfully, then system shows real-time interface screen and pre-operation emulation screen simultaneously for synchronistic model and data; If start unsuccessfully, then eject miscue dialog box, prompting failure cause.
Pre-operation execution module is responsible for man-machine interaction, the simulation operations of receiving scheduling person, and simulation operations is mainly the opening and closing lock state changing switch in supply line, to change or to adjust the method for operation of electrical network.
Pre-operative analysis module is the nucleus module of pre-OS, security to electrical network after pre-operation is provided, reliability, economy affect object information, specifically comprise following content: operations staff adjust the power system operating mode after power system operating mode actually effect how, whether can cause that electrical network is abnormal such as to be produced circuit heavy duty or reduce electric network reliability; The power grid risk increasing or reduce after carrying out various operation scheme.
Pre-operative analysis module is divided into 2 major parts: distribution Load flow calculation module and distribution risk evaluation module,
Wherein, distribution Load flow calculation module for add up power system operating mode change or adjustment after, the power load distributing on mains supply path, obtains the current value of each line switching; Whether distribution risk evaluation module is that electrical network mode changes rational important calibration tool, electric network reliability can be caused to reduce for analyzing the power system operating mode after changing or adjusting.
Analysis result display module, comprises real-time interface screen and pre-operation emulation screen, for by the change of power distribution network related electric amount caused by simulation operations and the risk of increase or minimizing, is shown by pre-operation emulation screen, and is formed with real-time interface screen and contrast.
Adopt the pre-operation analogue system of power distribution network of the present invention to carry out the method for pre-operation simulation analysis, comprise the steps:
1) start pre-operation analogue system, initialization pre-operation analogue system, obtain current electric grid data in electric power monitoring system and originate as the initialization data of emulation, and shown by real-time interface screen and pre-operation emulation screen; Current electric grid data comprise current electric grid model and current way, wherein current electric grid model is exactly the set of the current all devices of electrical network and annexation, current way is exactly the up-to-date mode data of electrical network, the state of the switchgear namely in electrical network, these information of the size of the electric current on switch, load.
2) yardman is according to pre-operation scheme, carries out simulation operations by pre-operation execution module, is mainly the opening and closing lock state changing switch in supply line, to change or to adjust the method for operation of electrical network.
3) by distribution Load flow calculation module to described step 2) simulation operations carry out distribution Load flow calculation, distribution Load flow calculation carries out necessarily idealized to distribution network model: the power factor of load is consistent, and namely distribution Load flow calculation adopts the algorithm of load current superposition.Adopt this algorithm reason to be: 1) distribution network condition is complicated, the tidal current computing method based on Newton-Raphson method does not meet the requirement of real-time of pre-operation emulation; 2) Distribution Network Equipment amount is large, change is frequent, and distribution net equipment parameter maintenance is slow, cannot obtain accurate impedance information, not meet the data demand of Newton-Raphson method; 3) through Practical on-site test, the computational accuracy of load current superposition algorithm satisfies the demands.
As shown in Figure 3, in figure, the switch of black display is closure state, the switch of white displays is off state, when after the method for operation change or adjustment of electrical network, close a floodgate for distribution switch A1 in Fig. 3, distribution Load flow calculation module adds up the power load distributing on supply path again, obtained the current value of each line switching by superposition calculation, circular is:
After 3-1) analogue system receives pre-operation instruction, obtain the displacement switch in supply line, after described displacement switch refers to pre-operation, opening of switch, conjunction state there occurs the switch of change, the present embodiment middle finger distribution switch A1;
3-2) define between the power supply point of supply line and displacement switch is upstream supply path, be downstream supply path between displacement switch and load, topology search is utilized to obtain displacement switch downstream supply path, in the present embodiment, both sides are power supply point, because right side exists a switch disconnected, therefore the flow direction of electric current is by the power supply point in left side to the right, be upstream supply path between sinistral power point to A1, there is distribution switch A1 to load ld2, distribution switch A1 to load ld3 two downstream feeder circuits;
If 3-3) pre-operation instruction is switch separating brake, then former on off state is for closing a floodgate, now the switching current value of upstream supply path reduces, reduce the current value that amplitude is displacement switch, the current value of described displacement switch is by distribution network master station system automatic acquisition, all devices dead electricity on the supply path of downstream, current value returns 0; Close a floodgate if pre-operation instruction is switch, then former on off state is separating brake, and the switching current value now on the supply path of upstream increases, and increase the current value that amplitude is displacement switch, the computing formula of the switching current value on the supply path of downstream is:
Wherein, I
brkfor switching current value on the supply path of downstream, I
ldthe current value of the load on the supply path of downstream;
The present embodiment breaker in middle closes a floodgate, then the switching current value on the supply path of upstream increases, and the current value being obtained displacement switch A1 by distribution network master station system is 20A, then on the supply path of upstream, the current value of isolating switch Brk1 becomes 30A+20A from 30A; On the supply path of downstream, what flow through switch A1 has two load ld2 and ld3, then I
a1=I
ld2+ I
ld3, be 20A, what flow through switch A2 has load ld3, then an I
a2=I
ld3, be 10A;
3-4) calculate the active power in supply line and reactive power, formula is as follows,
P=UIcosθ
Q=UIsinθ
Wherein, P is active power, and Q is reactive power, and U is line voltage, and I is line current, and θ is the angle of U and I; Line voltage, line current and angle theta are obtained automatically by distribution network master station system;
The switching current value of upstream supply path 3-5) will calculated, the switching current value of downstream supply path, active power and reactive power send remote measurement, are shown by pre-operation emulation screen, and are formed with real-time interface screen and contrast.
4) by distribution risk evaluation module to described step 2) simulation operations carry out operation of power networks risk assessment, analyze change or adjustment after power system operating mode electric network reliability whether can be caused to reduce, described risk assessment comprises:
N-1 analyzes, and carries out topology search to a certain feeder line, if find other bus by the lane place line way switch within m, then this feeder line meets N-1 principle; If find other bus by 0 lane place line way switch, then line looped network runs, and adds operation of power networks risk; Described m sets according to actual conditions.Wherein, the branch road be connected with any distribution node in feeder line assignment electrical network; N-1 principle is a kind of criterion judging power system security, also known as single failure safety criterion, according to this criterion, arbitrary independent component (generator, transmission line of electricity, transformer etc.) in N number of element of electric system break down and cut after, should not cause and cause user to have a power failure because of All other routes overload tripping operation, do not destroy the stability of system, do not occur the accidents such as collapse of voltage.
Heavy duty is analyzed, and the line current that goes out of line electricity source point exceedes circuit heavy duty threshold value, then circuit heavy duty, adds operation of power networks risk.The reasons such as circuit heavy duty assignment power network line user increase, fault load transfer cause 70% of line load amount overrate.
5) increase described step 4) analysis obtained or the operation of power networks risk of minimizing are shown, for yardman provides aid decision making by pre-operation emulation screen.
6) step 2 is repeated) to 5), until all pre-operation schemes all complete.
Fig. 4 shows real-time interface screen and pre-operation emulation screen comparing result, on pre-operation emulation screen can by confining, arrow instruction, tip instruction, highlighted display, the means such as flicker point out sensitive data, can also according to the requirement of yardman, in simulation process, the key point in simulation process is marked, after emulation terminates, these key points can be carried out tracking playback.Figure 4 shows that simulation operations instruction: the analysis result that line switching D closes a floodgate.Clearly can see that line switching D closes a floodgate the risk brought by real-time interface screen and pre-operation emulation screen comparing result: occurs 2 supply path loop-net operation, pre-operation emulates the circuit shielding and pointed out user's loop-net operation by the mode of highlighted display; By 2 power supply points of tip instruction prompting loop-net operation and the reason of generation risk.
The present invention is illustrated with preferred embodiment, should be appreciated that above-described embodiment does not limit the present invention in any form, the technical scheme that the form that all employings are equal to replacement or equivalent transformation obtains, and all drops within protection scope of the present invention.
Claims (1)
1. the pre-operation simulating analysis of power distribution network, is characterized in that, comprise the steps:
1) set up the pre-operation analogue system of power distribution network, be connected with electric power monitoring system, comprise following functions module:
High-speed simulation starts module, is responsible for initialization pre-operation analogue system, during startup, whether understand state belonging to detection high-speed simulation successively start, whether high-speed simulation function can be used, and successfully whether synchronistic model and data, if start successfully, then system shows real-time interface screen and pre-operation emulation screen simultaneously; If start unsuccessfully, then eject miscue dialog box, prompting failure cause;
Pre-operation execution module, is responsible for man-machine interaction, the simulation operations of receiving scheduling person;
Pre-operative analysis module, comprise distribution Load flow calculation and distribution risk assessment two functional modules, described distribution Load flow calculation module for add up power system operating mode change or adjustment after, the power load distributing on mains supply path, obtains the current value of each line switching; Described distribution risk evaluation module is used for power system operating mode and changes or after adjustment, carry out risk assessment to operation of power networks;
Analysis result display module, comprises real-time interface screen and pre-operation emulation screen, for by the change of power distribution network related electric amount caused by simulation operations and the risk of increase or minimizing, is shown by pre-operation emulation screen, and is formed with real-time interface screen and contrast;
2) start pre-operation analogue system, initialization pre-operation analogue system, obtain the initialization data source of data as emulation of current electric grid in electric power monitoring system, and shown by real-time interface screen and pre-operation emulation screen;
3) yardman is according to pre-operation scheme, carries out simulation operations by pre-operation execution module, and simulation operations is mainly the opening and closing lock state changing switch in supply line, to change or to adjust the method for operation of electrical network;
4) by distribution Load flow calculation module to described step 3) simulation operations carry out distribution Load flow calculation, distribution Load flow calculation adopt load current superposition algorithm, be specially:
After 4-1) analogue system receives simulation operations instruction, obtain the displacement switch in supply line, after described displacement switch refers to simulation operations, opening of switch, conjunction state there occurs the switch of change;
4-2) defining between the power supply point of supply line and displacement switch is upstream supply path, is downstream supply path between displacement switch and load, utilizes topology search to obtain displacement switch downstream supply path;
If 4-3) pre-operation instruction is switch separating brake, then former on off state is for closing a floodgate, now the switching current value of upstream supply path reduces, reduce the current value that amplitude is displacement switch, the current value of described displacement switch is by distribution network master station system automatic acquisition, all devices dead electricity on the supply path of downstream, current value returns 0; Close a floodgate if pre-operation instruction is switch, then former on off state is separating brake, and the switching current value now on the supply path of upstream increases, and increase the current value that amplitude is displacement switch, the computing formula of the switching current value on the supply path of downstream is: I
brk=Σ I
ld
Wherein, I
brkfor the current value of the switch on the supply path of downstream, I
ldthe current value of the load on the supply path of downstream;
4-4) calculate the active power in supply line and reactive power, computing formula is as follows,
P＝UIcosθ
Q＝UIsinθ
Wherein, P is active power, and Q is reactive power, and U is line voltage, and I is line current, and θ is the angle of U and I;
The switching current value of upstream supply path 4-5) will calculated, the switching current value of downstream supply path, circuit active power and reactive power send telemetry intelligence (TELINT), are shown by pre-operation emulation screen, and are formed with real-time interface screen and contrast;
5) by distribution risk evaluation module to described step 3) simulation operations carry out operation of power networks risk assessment, described risk assessment comprises:
N-1 analyzes, and carries out topology search to a certain feeder line, if find other bus by the lane place line way switch within m, then this feeder line meets N-1 principle; If find other bus by 0 lane place line way switch, then line looped network runs, and add operation of power networks risk, described m sets according to actual conditions;
Heavy duty is analyzed, and the line current that goes out of line electricity source point exceedes circuit heavy duty threshold value, then circuit heavy duty, adds operation of power networks risk;
6) by described step 5) the operation of power networks risk of analyzing the increase that obtains or minimizing shown, for yardman provides aid decision making by pre-operation emulation screen;
7) step 3 is repeated) to 6), until all pre-operation schemes all complete.
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| CN104298421B (en) * | 2014-06-23 | 2020-11-06 | 国家电网公司 | Power distribution network safety control method based on rapid simulation analysis technology |
| CN104898460B (en) * | 2015-04-14 | 2017-11-10 | 国网上海市电力公司 | Suitable for the online static security analysis system of districted dispatch system |
| CN105162119B (en) * | 2015-09-22 | 2017-06-16 | 贵州电网公司信息通信分公司 | A kind of local correction tidal current computing method suitable for large-scale distribution network |
| CN105867245B (en) * | 2016-05-14 | 2018-08-21 | 东北电力大学 | A kind of electric power information monitoring system |
| CN109817053A (en) * | 2019-03-25 | 2019-05-28 | 国网冀北电力有限公司管理培训中心 | Power of alterating and direct current fault simulation training system based on software emulation |
| CN110688774A (en) * | 2019-10-15 | 2020-01-14 | 云南电网有限责任公司 | Power grid fault simulation deduction system and method |
| CN110994622B (en) * | 2019-12-12 | 2023-06-02 | 国网湖北省电力有限公司宜昌供电公司 | Multi-resource cooperative control method for power grid for improving hydropower output capacity |
| CN111191911A (en) * | 2019-12-26 | 2020-05-22 | 深圳供电局有限公司 | Circuit heavy load and N-1 auxiliary judgment system based on planning operation |
| CN113138089A (en) * | 2021-04-21 | 2021-07-20 | 重庆中车长客轨道车辆有限公司 | Simulation operation method for railway vehicle test line |
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