CN102254241A - On-line estimating method for power demand balanced capability based on full network topology - Google Patents
On-line estimating method for power demand balanced capability based on full network topology Download PDFInfo
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Abstract
The invention relates to an on-line estimating method for a power demand balanced capability based on a full network topology, and the method comprises the following steps of: (1) establishing a two-level power grid scheduling network topology system comprising municipal power grid scheduling networks and various county level power grid scheduling networks; (2) introducing basic scheduling data and history data to a system database and updating the data real-time by a system server; and (3) automatically setting a low-frequency load-shedding scheme. In the invention, according to the principals of the full power grid electricity quantity balance, multiple restrict conditions and economic dispatch, the adopted method combining the full network topology analysis with the engineering experience can be used for finishing the full network low-frequency on-line calculation and the scheme setting calculation, predicting the system small area low-frequency control strategy, monitoring the dynamic operating characteristic of a power grid in real time, dynamically adjusting the scheme and fulfilling various statistical report forms, and assisting users to finish individual work excellently, thus, the strategic system can be controlled dynamically, efficiently, economically and safely to operate.
Description
Technical field
The invention belongs to field of power, especially a kind of electric power protection loop physics cut-offs condition detecting system and method thereof.
Background technology
According to the requirement of " power system safety and stability guide rule ", order and institute's cutting load quantity of automatic low-frequency load shedding must be rationally arranged in electric system.When system all or the part after the off-the-line when meritorious power shortage occurring, can in a planned way deduct the more less important load of sufficient amount automatically, to guarantee system safety operation and to the uninterrupted power supply of responsible consumer by frequency decline situation.
At present, the two-stage power network dispatching system is adopted in dispatching of power netwoks in big and medium-sized cities.Still Each performs its own functions in the low frequency load shedding solution formulation of city-level and district two-level scheduler network, the each department scheduling is according to traditional mode, formulate the low frequency load shedding scheme of oneself, the scheme that higher level's scheduling reports according to regional dispatchings at different levels, in conjunction with the topological relation of higher level's controlling equipment and each department scheduling scheme, formulate the low frequency load shedding scheme of entire city the whole network again.The problem of its existence is: dynamic tracking is calculated the whole network or little regional systems stable case exactly, is difficult in time follow the tracks of the low frequency load shedding scheme of adjusting the whole network, and the adaptability to changes of the anti-accident of electrical network is relatively poor.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of electricity needs balanced capacity online evaluation method based on full mesh topology is provided, this method can quick and precisely be simulated mains frequency and purchase dynamic tracking calculating the whole network or little regional systems stable case under electricity, system's interconnection or the load vacancy situation with sending out, realized that the electricity needs balanced capacity online evaluation in the full electric network scope calculates, improve the whole network power supply capacity and power supply quality better, alleviate the situation of power supply and demand anxieties such as the period short of electricity that may occur and accident power failure effectively.
The present invention solves its technical matters and takes following technical scheme to realize:
A kind of electricity needs balanced capacity online evaluation method based on full mesh topology may further comprise the steps:
(1) sets up the two-stage dispatching of power netwoks network topology system that comprises city-level dispatching of power netwoks network and each district level dispatching of power netwoks network;
(2) system server imports in the system database basic data dispatching and historical data and the real-time update data;
(3) automatic adjusting low frequency load shedding scheme.
And, comprise also that after step (2) the dispatching of power netwoks personnel (remove three blue words to the step that the EMS server carries out the dispatching of power netwoks data management on operating terminal?).
And, the method that described system server imports data is: with energy management system is main reduced model, with the XML file of electrical network CIM topological model and SVG form electrical network graphic file as data carrier, with switchgear information, switch history, real time data, once supply history, real time data, frequency history, real time data are docked in the system database.
And described automatic adjusting low frequency load shedding scheme may further comprise the steps:
(1) according to the electrical network basic parameter low frequency load shedding is carried out parameter tuning;
(2), calculate the whole network or local little area power grid stabilized frequency automatically by generation load, system's cycle and the system loading frequency characteristic coefficient of the whole network and district level electrical network;
(3) curve map of drafting low frequency load shedding scheme, and Simulation execution;
(4) according to the parameter of existing electrical network, selected good basic wheel number, taking turns frequency and frequency interval formulates low frequency load shedding scheme automatically substantially, and realization is turned down frequently with historical net, and the load shedding scheme contrasts;
(5) running status of real time monitoring electrical network and dynamically adjustment scheme.
And described setting parameter comprises operating frequencies at different levels, actuation time at different levels, every grade of excision load capacity and excises the load total amount.
And the computing method of described stabilization of power grids frequency are:
Relating to parameter has:
And, the method of the curve map of described drafting low frequency load shedding scheme is: the mode that adopts each round of every section time quantum of cycle calculations to operate and generate a point is carried out, corresponding processing is made in the exercises of each each round of cycle criterion, and judged whether to satisfy termination condition.
And described formulation low frequency load shedding scheme adopts recovers frequency method, as making the frequency definite value f of frequency stabilization in the i level after the action of i-1 level low frequency loadshedding equipment
On the i, wish that then i level low frequency loadshedding equipment can be with frequency retrieval to given recovery frequency f after moving
HfThe place, condition can calculate the load P of excisions at different levels thus
LiFor:
Order
Calculating formula in the time of must recovering frequency and be rated frequency
Wherein,
f
i: the startup frequency of i wheel.
f
Hf: the frequency that return to, adopt the rated frequency of system here.
Advantage of the present invention and good effect are:
The present invention is according to the full electric network balance of electric power and ener, the principle of multiple constraint condition and economic load dispatching, adopt the method for full mesh topology analysis and engineering experience combination, finished low frequency in the calculating of adjusting of line computation and scheme, the little regional low frequency control strategy of anticipation system, can the real time monitoring electrical network dynamically, dynamic adjustment scheme, and improve various statistical report forms, the help user makes a good job of work separately, thereby dynamically, efficiently, economical, the operation of control decision system safely, realized the standardization of electricity needs balanced capacity online evaluation decision system, systematization, methodization and high efficiency have essential meaning for standardized management.
Description of drawings
Fig. 1 is the two-stage dispatching of power netwoks network topology structure figure that adopts of the present invention;
Fig. 2 is an EMS automatic butt processing flow chart of the present invention;
Fig. 3 is UFLS simulation curve product process figure of the present invention.
Embodiment
Below in conjunction with accompanying drawing the embodiment of the invention is further described:
A kind of electricity needs balanced capacity online evaluation method based on full mesh topology comprises the steps:
1, set up two-stage dispatching of power netwoks network topology system, as shown in Figure 1, this system comprises city-level dispatching of power netwoks network and each district level dispatching of power netwoks network, city-level dispatching of power netwoks network comprises the system server that links together by LAN (Local Area Network), city-level EMS server, the operating terminal and the network switch, district level dispatching of power netwoks network comprises the district level EMS server that links together by LAN (Local Area Network), the operating terminal machine and the network switch, city-level dispatching of power netwoks network and each district level dispatching of power netwoks network are joined together to form two-stage dispatching of power netwoks network topology system by the network switch.
2, system server is with in the disposable database that imports to system server of basic data dispatching and historical data and the real-time update data.As shown in Figure 2, the method that system server imports data is: system server is main reduced model with network energy management system (EMS), with the xml file of electrical network CIM topological model and SVG form electrical network graphic file as data carrier, with switchgear information, switch history, real time data, once supply history, real time data, frequency history, real time data etc. are docked in the native system database.
This step adopts disposable importing master data and historical data and interval property to refresh the strategy that imports real time data, reduce the resource that takies under the big workload as much as possible, guarantee that simultaneously the user can real-time monitored arrive up-to-date data, finds the variation of electrical network in time, exactly, and makes strain.
3, the dispatching of power netwoks personnel carry out two-stage dispatching of power netwoks data management to the EMS server on operating terminal, for example, on operating terminal, according to the data field that imports, difference that type may exist or incomplete data are arranged, adjust data type or conversion replenishes incomplete data.
4, automatic adjusting low frequency load shedding scheme
In this step, realize that according to " electric system automatic low-frequency load shedding technical stipulation " and " electric system automatic low-frequency load shedding work management rules " low frequency is in the calculating (cutting load ratio or capacity) of adjusting of line computation and scheme, and the implementation of dynamic similation scheme, automatically specify low frequency load shedding scheme according to condition, and realize the contrast between different schemes.Its concrete automatic adjusting process is as follows:
(1) according to the electrical network basic parameter low frequency load shedding is carried out parameter tuning:
According to the electrical network basic parameter low frequency load shedding is carried out parameter tuning, setting parameter comprises operating frequencies at different levels, actuation time at different levels, every grade of excision load capacity and excises load total amount etc.
(2) connection line load, system's cycle and system loading frequency characteristic coefficient between the generation load by the whole network and district level electrical network, net calculate the whole network and local little area power grid stabilized frequency automatically.
In this step, by input the whole network and district level generation load, system's cycle and system loading frequency characteristic coefficient, automatically calculate the whole network and the local little area power grid stabilized frequency or the load value of adjusting, the information such as the action situation of aut.eq., the stable case of system frequency and the vacancy situation of loading that show directly perceived, the computing method of stabilization of power grids frequency are:
The parameter that relates to has:
(3) curve map and the Simulation execution of drafting low frequency load shedding scheme;
In this step, by data in the forms such as input relay time delay, the artificial time-delay of epicycle, behind the selection scheme wheel number, draw the curve map of low frequency load shedding scheme under given load vacancy situation of an input, implementation with the curve simulation scheme, intuitively show the action situation of aut.eq. and the stable case of system frequency, and stable tendency is made process prescription information automatically, to reach purposes such as evaluation of programme, the loadshedding equipment action of prediction low frequency and system frequency variation.
Draw low frequency load shedding curve map, as shown in Figure 3, adopt every section time quantum of cycle calculations (acquiescence 0.01s) operation of each round and the mode that generates a point are carried out, and the exercises of each each round of cycle criterion (comprising basic wheel and special the wheel) are made corresponding processing, and judged whether to satisfy termination condition, and its specific implementation step comprises:
1) the first time point of initialization, t=0, f=50;
2) chronomere that advances, t+=timeUnit calculates f;
3) prepare each round of traversal, initialization j=0;
4) judge that whether current frequency is less than or equal to the startup frequency of round j, is then to continue, otherwise jumps to #15;
5) judge that whether round j does not also trigger, and is then to continue, otherwise jumps to #7;
6) trigger round j, the initialization countdown is its artificial time-delay, and round j enters artificial time-delay.Jump to #20;
7) judge that round j whether in artificial time-delay, is then to continue, otherwise jumps to #11;
8) whether the countdown of judging round j finishes, and does not finish then to continue, and has finished then to jump to #10;
9) the countdown counting reduces by a chronomere, jumps to #20;
10) countdown finishes, and starts isolating switch, enters the machine time-delay, and it is the machine time-delay that countdown is set.The cutting load operation begins to carry out, and jumps to #20;
11) judge whether round j starts, promptly whether in the machine time-delay, be then to continue, otherwise jump to #20;
12) whether the countdown of judging round j finishes, and does not finish then to continue, and has finished then to jump to #14;
13) the countdown counting reduces by a chronomere, jumps to #20;
14) countdown finishes, i.e. machine time-delay finishes, and the cutting load operation is finished, and when preload has reduced the amount that round j excises, jumps to #20;
15) judge that round j whether in artificial time-delay, is then to continue, otherwise jumps to #17;
16) stop the countdown of round j, cancel its triggering, it is changed to the state of triggering, jump to #20;
17) judge whether round j starts, promptly whether in the machine time-delay, be then to continue, otherwise jump to #20;
18) whether the countdown of judging round j finishes, and does not finish then to continue, and has finished then to jump to #14;
19) the countdown counting reduces by a chronomere, jumps to #20;
20) round j judges end, and j++ if j＜wheel number jumps to #4, otherwise continues;
21) judging whether to reach stabilized frequency, is then to continue, otherwise jumps to #2;
22) judge that whether start the round of frequency on current frequency all cuts away, and is then to continue, otherwise jumps to #2;
23) finish.
(4) according to the parameter that has electrical network now, selected good basic wheel number, taking turns frequency and frequency interval formulates low frequency load shedding scheme automatically substantially, and simulation and net are turned down scheme contrast frequently and are turned down frequency load shedding scheme by selected corresponding time net, realize turning down load shedding scheme contrast frequently, thereby realize turning down load shedding scheme contrast frequently with historical net with net;
In step, to formulate the automatic low frequency load shedding scheme of formulating and adopt the algorithm employing to recover frequency method, its mentality of designing is to attempt the recovery system frequency, makes the frequency definite value f of frequency stabilization in the i level after moving as i-1 level low frequency loadshedding equipment
iOn, wish that then i level low frequency loadshedding equipment can be with frequency retrieval to given recovery frequency f after moving
HfThe place, condition can calculate the load P of excisions at different levels thus
LiFor
Order
Calculating formula in the time of must recovering frequency and be rated frequency
Wherein,
f
i: the startup frequency of i wheel.
f
Hf: the frequency that return to, adopt the rated frequency of system here.
(5) running status of real time monitoring electrical network and dynamically adjustment scheme
In this step, the running status of real time monitoring electrical network is dynamically adjusted scheme, and improves various statistical report forms, waits by literal, figure and form and expresses and transmit various information.
The present invention by design low frequency load shedding simulation curve flow process, adopts the method with full mesh topology analysis and engineering experience combination, the accurate Calculation stabilized frequency and the mathematical model between the load of adjusting according to the basic parameter of electrical network.Realize that low frequency is in the calculating of adjusting of line computation and scheme, anticipation the whole network and local little regional low frequency load shedding control strategy, and dynamic surveillance operation of power networks state, according to the whole network and little regional power balance tendency, online or calculated off-line or adjust generating, interconnection, load vacancy ratio, verification system stable region and time limit, thereby dynamically adjust control strategy, automatically generate the implementation and the conclusion of dynamic similation conditional curve modeling scheme, intuitively show information such as the action situation of aut.eq., the stable case of system frequency and the vacancy situation of loading.The data that utilization is docked from EMS realize the on-line tuning to the whole network and little regional low frequency load shedding scheme, stipulate according to the technical management of low frequency load shedding, the design system flow process, by online or calculated off-line, the action situation of aut.eq. and the stable case of system frequency of showing directly perceived, thereby formulate low frequency load shedding scheme, and the implementation of curve simulation scheme.
It is emphasized that; embodiment of the present invention is illustrative; rather than it is determinate; therefore the present invention is not limited to the embodiment described in the embodiment; every other embodiments that drawn by those skilled in the art's technical scheme according to the present invention belong to the scope of protection of the invention equally.
Claims (8)
1. electricity needs balanced capacity online evaluation method based on full mesh topology is characterized in that: may further comprise the steps:
(1) sets up the two-stage dispatching of power netwoks network topology system that comprises city-level dispatching of power netwoks network and each district level dispatching of power netwoks network;
(2) system server imports in the system database basic data dispatching and historical data and the real-time update data;
(3) automatic adjusting low frequency load shedding scheme.
2. the electricity needs balanced capacity online evaluation method based on full mesh topology according to claim 1 is characterized in that: comprise also that after step (2) the dispatching of power netwoks personnel carry out the step of dispatching of power netwoks data management to the EMS server on operating terminal.
3. the electricity needs balanced capacity online evaluation method based on full mesh topology according to claim 1, it is characterized in that: the method that described system server imports data is: with the network energy management system is main reduced model, with the XML file of electrical network CIM topological model and SVG form electrical network graphic file as data carrier, with switchgear data, switch history, real time data, once supply history, real time data, frequency history, real time data are docked in the system database.
4. the electricity needs balanced capacity online evaluation method based on full mesh topology according to claim 1 is characterized in that: described automatic adjusting low frequency load shedding scheme may further comprise the steps:
(1) according to the electrical network basic parameter low frequency load shedding is carried out parameter tuning;
(2) connection line load, system's cycle and system loading frequency characteristic coefficient between the generation load by the whole network and district level electrical network, net calculate the whole network and local little area power grid stabilized frequency automatically;
(3) curve map and the Simulation execution of drafting low frequency load shedding scheme;
(4) according to the parameter of existing electrical network, selected good basic wheel number, taking turns frequency and frequency interval formulates low frequency load shedding scheme automatically substantially, and realization is turned down frequently with historical net, and the load shedding scheme contrasts;
(5) running status of real time monitoring electrical network and dynamically adjustment scheme.
5. the electricity needs balanced capacity online evaluation method based on full mesh topology according to claim 4 is characterized in that: described setting parameter comprises operating frequencies at different levels, actuation time at different levels, every grade of excision load capacity and excises the load total amount.
6. the electricity needs balanced capacity online evaluation method based on full mesh topology according to claim 4, it is characterized in that: the computing method of described stabilization of power grids frequency are:
Following formula relates to parameter to be had:
Δ P: the amount of excision load, f
∞: new stabilized frequency, Δ f: the variable quantity of frequency, f
e: rated frequency, ω: generator amature angular velocity, K
L: the frequency adjustment coefficient of load, P
m: keep the generator active power of output perunit value of operation, think constant, P
L: the load active power perunit value when system frequency is f, D
T: total damping factor, T
a: to keep the operation generator torque is the moment of accelerating perunit value of benchmark, M: the genset inertia constant that keeps operation.
7. the electricity needs balanced capacity online evaluation method based on full mesh topology according to claim 4, it is characterized in that: the method for the curve map of described drafting low frequency load shedding scheme is: the mode that adopts each round of every section time quantum of cycle calculations to operate and generate a point is carried out, corresponding processing is made in the exercises of each each round of cycle criterion, and judged whether to satisfy termination condition.
8. the electricity needs balanced capacity online evaluation method based on full mesh topology according to claim 4, it is characterized in that: described formulation low frequency load shedding scheme adopts recovers frequency method, as making the frequency definite value f of frequency stabilization in the i level after the action of i-1 level low frequency loadshedding equipment
iOn, wish that then i level low frequency loadshedding equipment can be with frequency retrieval to given recovery frequency f after moving
HfThe place, condition can calculate the load P of excisions at different levels thus
LiFor:
i＝1，2，...n
Make f
Hf=f
e, the calculating formula in the time of must recovering frequency and be rated frequency
Wherein:
Δ P
Li: the load of i wheel excision.
f
i: the startup frequency of i wheel.
f
Hf: the frequency that return to, adopt the rated frequency of system here.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103279814A (en) * | 2012-01-20 | 2013-09-04 | 株式会社理光 | Apparatus and system for managing multiple electronic devices |
| CN104794580A (en) * | 2015-04-28 | 2015-07-22 | 电力规划设计总院 | Unit-by-unit month-by-month electric power and energy balance calculation method |
| CN103761587B (en) * | 2014-02-13 | 2016-08-17 | 国家电网公司 | A kind of electric power demand side MRP method based on intelligent power technology |
| CN109728993A (en) * | 2019-01-28 | 2019-05-07 | 赵瑞红 | Remote lan encryption authentication device and application method based on VXLAN |
| CN112564032A (en) * | 2020-11-27 | 2021-03-26 | 国网四川省电力公司德阳供电公司 | Adjusting method for setting line of low-frequency load shedding protection device of city power grid |
| CN112600236A (en) * | 2020-12-09 | 2021-04-02 | 国电南瑞科技股份有限公司 | Frequency centralized correction control method and system based on multi-source flexible power fast adjustment |
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2011
- 2011-06-07 CN CN2011101505565A patent/CN102254241A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103279814A (en) * | 2012-01-20 | 2013-09-04 | 株式会社理光 | Apparatus and system for managing multiple electronic devices |
| CN103761587B (en) * | 2014-02-13 | 2016-08-17 | 国家电网公司 | A kind of electric power demand side MRP method based on intelligent power technology |
| CN104794580A (en) * | 2015-04-28 | 2015-07-22 | 电力规划设计总院 | Unit-by-unit month-by-month electric power and energy balance calculation method |
| CN104794580B (en) * | 2015-04-28 | 2018-02-06 | 电力规划设计总院 | It is a kind of by unit balance of electric power and ener computational methods month by month |
| CN109728993A (en) * | 2019-01-28 | 2019-05-07 | 赵瑞红 | Remote lan encryption authentication device and application method based on VXLAN |
| CN112564032A (en) * | 2020-11-27 | 2021-03-26 | 国网四川省电力公司德阳供电公司 | Adjusting method for setting line of low-frequency load shedding protection device of city power grid |
| CN112564032B (en) * | 2020-11-27 | 2023-03-28 | 国网四川省电力公司德阳供电公司 | Adjusting method for setting line of low-frequency load shedding protection device of city power grid |
| CN112600236A (en) * | 2020-12-09 | 2021-04-02 | 国电南瑞科技股份有限公司 | Frequency centralized correction control method and system based on multi-source flexible power fast adjustment |
| CN112600236B (en) * | 2020-12-09 | 2023-02-28 | 国电南瑞科技股份有限公司 | Frequency centralized correction control method and system based on multi-source flexible power fast adjustment |
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Application publication date: 20111123 |