CN101860025A - Predictor-corrector technology-based power loss calculation method of grid in future operation mode - Google Patents
Predictor-corrector technology-based power loss calculation method of grid in future operation mode Download PDFInfo
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- CN101860025A CN101860025A CN201010185164A CN201010185164A CN101860025A CN 101860025 A CN101860025 A CN 101860025A CN 201010185164 A CN201010185164 A CN 201010185164A CN 201010185164 A CN201010185164 A CN 201010185164A CN 101860025 A CN101860025 A CN 101860025A
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Abstract
The invention discloses a predictor-corrector technology-based power loss calculation method of a grid in the future operation mode. The method comprises the following steps: performing the analysis and calculation of routine power flow according to the referenced grid power flow, determining an initial grid loss rate coefficient; then loading all kinds of planning data to preliminarily form a future operation mode of the grid, predicting the size of grid loss according to the grid loss rate coefficient in prediction stage, determining the total variation of bus loads, decomposing the total variation to each bus load; in the grid loss correction stage, adopting the computing mode of a multi-slack machine to perform the analysis and calculation of routine power flow, correcting the deviation of grid loss estimation, adopting the iteration of the prediction stage and the correction stage to finally obtain the calculation result of grid loss. By adopting the method of the invention, more accurate grid loss calculated value can be finally obtained to replace the former and approximate estimation value, thus more accurate operation mode of the grid can be obtained in the grid management planning and the safety and economy of the operation of the grid can be increased.
Description
Technical field
The invention belongs to power system dispatching plan safety check analysis field, relate to a kind of off line loss calculation method of the following operational mode of electrical network based on prediction-alignment technique.
Background technology
The most basic requirement of dispatching of power netwoks is safe operation, and along with the interconnected fast development of large regional grid, the electric power networks scale is increasing, complexity is more and more higher, and the difficulty of operation of power networks is increasing.It is the safe condition of multianalysis electrical network under various operational modes that safety is checked function, guarantees the important defence line together of especially big electricity net safety stable.The via net loss of electrical network (abbreviation network loss), mainly be included in the active power loss in power circuit and the transformer, its size is closely related with the operational mode of system, bigger calculation deviation directly has influence on the power-balance that is subjected to electricity consumption of sending out to electrical network analysis, increase balancing machine rated output deviation, cause the distortion of tidal current analysis.Therefore, reasonably the network loss processing mode has great significance to guaranteeing the accuracy that generation schedule safety is checked.
Common processing is rule of thumb to be provided with to network loss in electric network swim calculates, or according to the network loss rate approximate processing of reference section, the network loss rate changed and forms under the less hypothesis when this was based on power system operating mode and does not have bigger change, but in fact in the planning link, under the condition of different generation modes and Load distribution, the network loss rate has bigger variation, and the network loss level also has than big-difference, and the conventional method calculation deviation is bigger.
Summary of the invention
Purpose of the invention process be to provide a kind of under the changes of operating modes situation effective network loss processing method, make that the power-balance of generation schedule and load side can be more reasonable.
The present invention is based on the physical model parameter of electrical network, the network topology data, the load prediction data, generation schedule data etc. are constantly adjusted network loss numerical value according to the step of determining, obtain the result of calculation that is applicable to that generation schedule safety is checked.
Therefore, the present invention proposes a kind of dispatching of power netwoks plan safety that is applicable to and check the network loss computational methods based on prediction-alignment technique of tidal current analysis.Mainly solved following problem:
In the electric network swim analytical calculation of real time execution, network loss often adopts fixedly network loss coefficient mode to handle, and under the small adjustment situation of operational mode, the variation of network loss is also less, can satisfy the general precision calculation requirement substantially.But for the FutureGen initiative trend, because widely different on the operational mode, the numerical value of its network loss variable quantity is quite big.After adopting the processing mode of fixed network loss rate, use conventional tidal current analysis to calculate, the deviation on network loss is handled finally need the balance unit to hold but, cause these generator powers and plan to produce deviation, thereby influence the whole network analysis result.
After adopting prediction-alignment technique to handle, network loss becomes accurate Calculation from original estimation, has improved the accuracy of checking at generation schedule safety greatly.
This method comprises the steps:
1) according to the electric network swim of reference, carry out conventional tidal current analysis and calculate, determine original net loss rate coefficient;
2) load all kinds of generator output plans and electrical network outside and be subjected to the electricity plan, and the bus load prediction data, and determine the grid equipment state that puts into operation, begin to take shape the following operational mode of electrical network according to maintenance scheduling;
3) network loss forecast period:, send out according to electrical network and concerned by the power-balance of electricity consumption with formula (2) prediction network loss size according to current network loss rate coefficient, determine that bus load always adds variable quantity, and decompose on each bus load;
Network loss rate=network loss/(in the generating mesh portions always add+be subjected to electricity always add) (1)
Be network loss=network loss rate * (in the generating mesh portions always add+be subjected to electricity always add) (2)
In the generating mesh portions always add+be subjected to electricity and always add-network loss=bus load always adds (3)
4) network loss calibration phase: adopt the multi-balancing machine account form to carry out conventional tidal current analysis and calculate, balancing generator is estimated deviation with respect to the departure of generation schedule as network loss, if the deviation of network loss estimation within the threshold value that is provided with or prediction-correction calculation number of times exceed maximum times (as specifying 5 times), then enter step 5), otherwise recomputate network loss and network loss rate, enter step 3).
5) the network loss estimation finishes, and forms the trend section that following operational mode is analyzed, and calculates and finishes.
Trend needs to carry out a series of settings before calculating, as rational balancing machine and PV node are set.Do not restrain if trend is calculated, can adjust the setting of PV node automatically.
Method of the present invention has following characteristics and function:
1) can consider the correlation that network loss and generating, load and power network topology change, allow generating set, calculate suitable network loss numerical value automatically, lay the first stone for accurately analyzing in strict accordance with under the prerequisite that does not change generation schedule.
2) use the iterative manner of prediction-corrections, can control the network loss computational accuracy level of expecting acquisition, help at different application from computational accuracy and computing times two aspect carry out Balance Control.
The invention has the beneficial effects as follows quantitative analysis generation schedule safety check in network loss size during operation of power networks, improve electric network swim greatly and analyze the reasonability of data, no matter in generation schedule establishment in a few days, generation schedule establishment a few days ago, the power grid security check analysis of still monthly generation schedule establishment, the establishment of annual generation schedule, can use this method to obtain network loss more accurately, avoid causing than large deviation the adjustment of part of generating units is excessive when tidal current analysis, influence is to the judged result of power system operating mode.
The network loss computational methods based on prediction-alignment technique of checking the tidal current analysis characteristics at FutureGen initiative safety are found out in network loss Calculation and Study and trial that this method is carried out under the actual electric network data.This method is through the alternately iteration of prediction, correction, the final network loss calculated value more accurately that obtains, substitute original rough estimated value, help in the dispatching of power netwoks planning, to obtain power system operating mode more accurately, work out rational operation plan, improve the fail safe and the economy of operation of power networks.
Description of drawings
Fig. 1 is the network loss calculation flow chart based on prediction-alignment technique.
Embodiment
The present invention is based on the following operational mode network loss of the electrical network computational methods of prediction-alignment technique.Be a preferred case study on implementation of the present invention below, comprised and adopted the inventive method that its feature, purpose and advantage can be found out from the explanation of embodiment in the electrical network network loss analytic process in the generation schedule operational mode a few days ago.
A few days ago in the generation schedule compilation process, need carry out safe check at electrical network, analyze each period power system operating mode, integrate the generation schedule data, carry out trend and calculate, analyze the operation weak spot of electrical network 96 periods of next day.
The following operational mode network loss of electrical network of the present invention computational methods are mainly based on prediction-alignment technique, by the estimation of forecast period to network loss, to the correction of calibration phase, the deviation of network loss calculated value can be weighed by the power deviation of balancing machine, finally obtains accurate network loss calculated value.
(1) as a reference, carry out conventional tidal current analysis and calculate, determine original net loss rate coefficient according to nearest actual electric network trend.
(2) load t period generator output plan and electrical network outside and be subjected to the electricity plan, and the bus load prediction data, and determine the grid equipment state that puts into operation, begin to take shape the following operational mode of electrical network according to effective maintenance scheduling of t period.
(3) network loss forecast period.According to network loss rate coefficient prediction network loss size, electrical network is sent out and concerned by the power-balance of electricity consumption, determines that bus load always adds variable quantity, and decomposes on each bus load.
(4) network loss calibration phase.Adopting the multi-balancing machine account form to carry out conventional tidal current analysis calculates, balancing generator is estimated deviation with respect to the departure of generation schedule as network loss, if the deviation of network loss estimation (1MW) or prediction-correction calculation number of times within the threshold value that is provided with exceed maximum times (5 times), then enter step (5), otherwise recomputate network loss and network loss rate.Enter step (3).
(5) the network loss estimation finishes, and forms the trend section that following operational mode is analyzed, and calculates and finishes.
Practical application effect
The technical program is economized in the electrical network safety nucleus correcting system at certain and is applied.This system comprises a few days ago, in a few days, a plurality of cycles such as real-time and monthly are to the tidal current analysis function of following operational mode, are that the prospective project data are being integrated on the basis, use the present invention and network loss is made finish on the basis of accurate analysis.
In following operational mode, with of the reference of generation schedule deviation index, adopt computational methods of the present invention as the network loss calculation deviation, its index obviously improves, and tidal current analysis result on this basis more tallies with the actual situation.
The network loss computational methods based on prediction-alignment technique of checking the tidal current analysis characteristics at FutureGen initiative safety are found out in research and trial that the network loss that this method is carried out under the actual electric network data is calculated.This method is through prediction, the alternately iteration of proofreading and correct, the final network loss calculated value more accurately that obtains, substitute original rough estimated value, help in the dispatching of power netwoks planning, to obtain power system operating mode more accurately, work out rational operation plan, improve the fail safe and the economy of operation of power networks, no matter in generation schedule establishment in a few days, generation schedule establishment a few days ago, still monthly generation schedule establishment, the power grid security check analysis of year generation schedule establishment, can use this method to obtain network loss more accurately, avoid causing than large deviation the adjustment of part of generating units is excessive when tidal current analysis, influence has promotion prospect widely to the judged result of power system operating mode.
According to specific exemplary case study on implementation the present invention has been described herein.Do not break away to one skilled in the art and carry out suitable replacement under the scope of the invention or modification is conspicuous.Exemplary case study on implementation only is illustrative, rather than to the restriction of scope of the present invention, scope of the present invention is by affiliated claim definition.
Claims (1)
1. the following operational mode network loss of the electrical network computational methods based on prediction-alignment technique comprise the steps: it is characterized in that, may further comprise the steps:
1) according to the electric network swim of reference, carry out conventional tidal current analysis and calculate, determine original net loss rate coefficient;
2) load all kinds of generator output plans and electrical network outside and be subjected to the electricity plan, and the bus load prediction data, and determine the grid equipment state that puts into operation, begin to take shape the following operational mode of electrical network according to maintenance scheduling;
3) network loss forecast period: send out and concerned by the power-balance of electricity consumption with formula (1) prediction network loss size, electrical network according to current network loss rate coefficient, determine that bus load always adds variable quantity, and decompose on each bus load;
Network loss=network loss rate * (in the generating mesh portions always add+be subjected to electricity always add) (1)
4) network loss calibration phase: adopt the multi-balancing machine account form to carry out conventional tidal current analysis and calculate, balancing generator is estimated deviation with respect to the departure of generation schedule as network loss, if the deviation of network loss estimation within the threshold value that is provided with or prediction-correction calculation number of times exceed maximum times, then enter step 5), otherwise recomputate network loss and network loss rate, enter step 3).
5) the network loss estimation finishes, and forms the trend section that following operational mode is analyzed, and calculates and finishes.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2429061A1 (en) * | 2010-09-08 | 2012-03-14 | EnBW Energie Baden-Württemberg AG | Method for improved energy loss forecasting in a transfer network |
| WO2012113235A1 (en) * | 2011-02-23 | 2012-08-30 | 河北省电力研究院 | Method for calculating loss reduction ratio of newly-built transformer substation of power system |
| WO2015090090A1 (en) * | 2013-12-18 | 2015-06-25 | 国家电网公司 | Method for determining integrated network loss rate in ultra-high voltage alternating current cross-regional energy trade |
| WO2016062179A1 (en) * | 2014-10-24 | 2016-04-28 | 南京南瑞继保电气有限公司 | Method for implementing plan security check on the basis of power grid operation service bus |
| CN106971239A (en) * | 2017-03-10 | 2017-07-21 | 国网山东省电力公司经济技术研究院 | A kind of improved reference power network evaluation method |
| CN110351143A (en) * | 2019-07-17 | 2019-10-18 | 广东电网有限责任公司 | A kind of electric power communication resource management system, method, apparatus and readable storage medium storing program for executing |
-
2010
- 2010-05-27 CN CN201010185164A patent/CN101860025A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2429061A1 (en) * | 2010-09-08 | 2012-03-14 | EnBW Energie Baden-Württemberg AG | Method for improved energy loss forecasting in a transfer network |
| WO2012113235A1 (en) * | 2011-02-23 | 2012-08-30 | 河北省电力研究院 | Method for calculating loss reduction ratio of newly-built transformer substation of power system |
| WO2015090090A1 (en) * | 2013-12-18 | 2015-06-25 | 国家电网公司 | Method for determining integrated network loss rate in ultra-high voltage alternating current cross-regional energy trade |
| US10580096B2 (en) | 2013-12-18 | 2020-03-03 | State Grid Corporation Of China Economic & Technology Research | Method for determining integrated network loss rate in UHV AC cross-regional electricity trading |
| WO2016062179A1 (en) * | 2014-10-24 | 2016-04-28 | 南京南瑞继保电气有限公司 | Method for implementing plan security check on the basis of power grid operation service bus |
| CN106971239A (en) * | 2017-03-10 | 2017-07-21 | 国网山东省电力公司经济技术研究院 | A kind of improved reference power network evaluation method |
| CN106971239B (en) * | 2017-03-10 | 2020-09-11 | 国网山东省电力公司经济技术研究院 | Improved reference power grid evaluation method |
| CN110351143A (en) * | 2019-07-17 | 2019-10-18 | 广东电网有限责任公司 | A kind of electric power communication resource management system, method, apparatus and readable storage medium storing program for executing |
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Application publication date: 20101013 |