CN112366686A - Automatic generation method of low-frequency load reduction distribution scheme suitable for distributed photovoltaic - Google Patents
Automatic generation method of low-frequency load reduction distribution scheme suitable for distributed photovoltaic Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
- G06Q50/06—Electricity, gas or water supply
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
- H02J3/144—Demand-response operation of the power transmission or distribution network
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2113/00—Details relating to the application field
- G06F2113/04—Power grid distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
Abstract
The invention discloses an automatic generation method of a low-frequency load-reducing distribution scheme suitable for distributed photovoltaic, which comprises the following steps: the method comprises the steps of online real-time modeling of a low-frequency simulation model, online simulation analysis of a low-frequency load shedding device based on a preset fault set, and automatic generation of a low-frequency load shedding distribution scheme suitable for distributed photovoltaic. The technical scheme provided by the invention can dynamically and uniformly arrange each turn to control the load quantity, avoid the phenomenon that the load control rate is too high or too low, ensure that the control rate of each turn and the total load of the power grid are in a reasonable range, simultaneously meet the requirement of low-frequency load reduction, give out a scheme after adjustment through online simulation check to judge whether the power grid meets the safe and stable operation, so as to guide and adjust a low-frequency load reduction distribution scheme suitable for distributed photovoltaic, change the working mode of once-a-year low-frequency load reduction distribution, eliminate the hidden danger of large-scale distributed photovoltaic grid connection to the safe operation of the power grid, and ensure the safe and stable operation of the power grid.
Description
Technical Field
The invention relates to the technical field of power grid operation and control, in particular to an automatic generation method of a low-frequency load-reducing distribution scheme suitable for distributed photovoltaic.
Background
With the strong support of the photovoltaic industry by the state, relevant policies fall on the ground, the photovoltaic industry is greatly increased, the installed capacity and proportion of the photovoltaic industry are greatly increased compared with the prior art, and meanwhile, the development of new energy is always in a continuous stage.
The low-frequency load shedding is the most effective measure for the low-frequency emergency control, and is the third defense line for the safety and stability of the power system.
In recent years, distributed photovoltaic large-scale grid connection has increasingly large influence on low-frequency load shedding of a power grid, the load reversing condition generally exists, the control rate of the low-frequency load shedding effective load of the power grid is reduced, the condition that frequency further falls down due to mistaken removal of distributed new energy generally exists, and hidden danger is brought to stable operation of the power grid frequency.
The method comprises the following steps that a low-frequency load shedding capacity distribution scheme adaptive to distributed photovoltaic needs to be formulated again, and when the access scheme of a low-frequency load shedding device in a region and a substation is formulated, all lines accessed by the distributed photovoltaic are removed and replaced by pure load lines; meanwhile, the existing scheme adjusting mode taking the year as a period is changed, and the newly appeared trend feedback circuit is replaced in time after the annual scheme is issued and continuously tracked, analyzed and dynamically adjusted.
Disclosure of Invention
The invention aims to solve the technical problems and provides an automatic generation method of a low-frequency load-reducing distribution scheme adaptive to distributed photovoltaic.
The invention is realized by the following technical scheme:
the automatic generation method of the low-frequency load-reducing distribution scheme suitable for distributed photovoltaic comprises the following steps:
the method comprises the following steps: online real-time modeling of the low-frequency simulation model;
step two: realizing online simulation analysis of the low-frequency load shedding device based on a preset fault set;
step three: the automatic generation of the low-frequency deloading distribution scheme of the distributed photovoltaic is adapted.
Further, in the step one, the online real-time modeling of the low-frequency simulation model is to construct an offline power grid load flow and stability calculation model based on PSD-BPA software, and dynamically generate a low-frequency real-time load flow calculation model and a load shedding frequency stability calculation model on line by combining real-time load data of a smart power grid dispatching control system D5000 and real-time load data of a low-frequency load shedding device.
Furthermore, in the second step, on the basis of integrating the PSD-BPA power flow and the stable calculation function, a quick calculation function and a quick analysis function of a low-frequency simulation calculation result under a preset fault are researched so as to meet the online simulation analysis of a plurality of fault sets, a plurality of time sections and a plurality of load shedding schemes.
Further, in the third step, aiming at solving the problem of low-frequency load control rate caused by large-scale grid connection of distributed photovoltaic, a low-frequency load shedding scheme and a control strategy of each turn of the power grid are researched, and a power grid low-frequency load shedding capacity distribution scheme suitable for distributed photovoltaic is worked out.
Furthermore, on the basis of integrating PSD-BPA load flow calculation, multithread calling is used instead, and a calculation model is finely adjusted in a modification card mode on the basis of a first load flow calculation result to achieve a rapid calculation effect.
Furthermore, based on the integrated PSD-BPA stable calculation, multithread calling is used instead, and batch calculation and batch analysis are realized in a batch processing calculation script mode by closing a stable calculation interactive window, so that the on-line calculation requirement is met.
Furthermore, a solution measure with low load control rate caused by reverse power flow is formed by combing and counting data of the influence of the distributed photovoltaic on the low-frequency load shedding of the power grid, and a low-frequency load shedding distribution adjustment constraint strategy adaptive to the distributed photovoltaic is worked out, so that automatic generation of a low-frequency load shedding distribution scheme is obtained.
Further, a time section with a low load control rate according to historical statistics is selected, the time section is brought into an adjusted low-frequency load reduction distribution scheme, safety check is conducted from the two aspects of thermal stability and frequency stability, and the low-frequency load reduction distribution scheme is obtained.
Compared with the prior art, the invention has the beneficial effects that:
the invention discloses an automatic generation method of a low-frequency load-reducing distribution scheme suitable for distributed photovoltaic, which has the following beneficial effects:
1. the technical scheme provided by the invention can dynamically and uniformly arrange each round to control the load quantity, avoid the phenomenon of overhigh or overlow load control rate, ensure that the control rate of each round and the total load of the power grid are in a reasonable range, and simultaneously can reduce the load requirement at low frequency.
2. Whether the adjusted scheme meets the safe and stable operation of the power grid or not is checked through online simulation, so that the low-frequency load reduction distribution scheme suitable for distributed photovoltaic is guided and adjusted, the working mode of once-a-year low-frequency load reduction distribution is changed, the hidden danger of safe operation of the power grid caused by large-scale distributed photovoltaic grid connection is eliminated, the safe and stable operation of the power grid is guaranteed, the occurrence of large-area power failure accidents is avoided, the operation stability of a power system is obviously improved, and the safe operation level of the power grid is improved.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example (b):
firstly, online real-time modeling of a low-frequency simulation model.
An offline power grid load flow and stability calculation model of 220 kilovolt or more in A province and 110 kilovolt or less in B city power grid is constructed based on PSD-BPA software, and a low-frequency real-time load flow calculation model and a load shedding frequency stability calculation model are dynamically generated on line by combining real-time load data of a smart power grid dispatching control system D5000 and real-time load data of a low-frequency load shedding device.
A power grid flow model of 10 kilovolts or more of a B city power grid is automatically constructed based on a D5000 platform of a B city smart power grid dispatching control system according to a PSD-BPA flow file filling mode, and is spliced with power grid flow models of 220 kilovolts or more of other cities of A province in an A province dispatching demonstration network platform to generate a low-frequency simulation flow model meeting the B city power grid in real time.
Based on the east China and A power-saving network low-frequency load reduction scheme, a load reduction model is established for the B city power grid by taking a bus as a unit and by using the actual low-frequency control load, the B city power grid low-frequency control load in each turn is automatically calculated according to a load control rate calculation formula, the actual measurement total load and the turn proportion, and the load reduction model is established by taking an area as a unit, so that the real-time low-frequency stable model is established.
And secondly, realizing online simulation analysis of the low-frequency load shedding device based on a preset fault set.
On the basis of integrating PSD-BPA load flow and stable calculation functions, a quick calculation function under a preset fault and a quick analysis function of a low-frequency simulation calculation result are researched so as to meet the on-line simulation analysis of a plurality of fault sets, a plurality of time sections and a plurality of load shedding schemes.
On the basis of integrated PSD-BPA load flow (PFNT.EXE) calculation, multithread calling is used instead, and meanwhile, in order to improve the rapid calculation level, the overall change of low-frequency scheme adjustment is not large, so that the rapid calculation effect is achieved by finely adjusting a calculation model in a card modifying mode on the basis of the first load flow calculation result (the one-time calculation speed is improved by more than 5 times).
Based on the integrated PSD-BPA stable (SWNT.EXE) calculation, multithread calling is used instead, and meanwhile, in order to improve the rapid calculation level, batch calculation and batch analysis are realized in a batch processing calculation script mode (bat script) by closing a stable calculation interactive window, so that the on-line calculation requirement is met.
And thirdly, automatically generating a low-frequency load shedding distribution scheme suitable for distributed photovoltaic.
According to the following steps of firstly making secondary importance and then making important importance; agriculture and industry are carried out firstly; according to the principle of suburb county and aftermarket, aiming at solving the problem of low-frequency load control rate caused by large-scale grid connection of distributed photovoltaic, researching a low-frequency load shedding scheme and a control strategy of each turn of the B city power grid, and making a low-frequency load shedding capacity distribution scheme of the B city power grid suitable for the distributed photovoltaic.
By combing and counting the influence of the distributed photovoltaic on the low-frequency load shedding of the power grid, a solution measure with low load control rate caused by the reverse transmission of the power flow is formed, and a low-frequency load shedding distribution adjustment constraint strategy adaptive to the distributed photovoltaic is worked out, so that the automatic generation of a low-frequency load shedding distribution scheme is realized.
Selecting a time section with low load control rate according to historical statistics, bringing the time section into an adjusted low-frequency load reduction distribution scheme, carrying out safety check from two aspects of thermal stability and frequency stability, and finally providing the most reasonable low-frequency load reduction distribution scheme
The invention discloses an automatic generation method of a low-frequency load-reducing distribution scheme suitable for distributed photovoltaic, which has the following beneficial effects:
the technical scheme provided by the invention can dynamically and uniformly arrange each round to control the load, avoid the phenomenon of overhigh or overlow load control rate, ensure that the control rate of each round and the total load of the B-city power grid is in a reasonable range (100 plus 120%), meanwhile, the requirement of low frequency load reduction under provincial dispatching of A provinces is met, whether the regulated scheme meets the safe and stable operation of the power grid is given through online simulation check, the low-frequency load reduction distribution scheme suitable for the distributed photovoltaic is guided and adjusted, the working mode of once-a-year low-frequency load reduction distribution is changed, the hidden danger of safe operation of a power grid caused by large-scale distributed photovoltaic grid connection is eliminated, the safe and stable operation of the power grid is ensured, meanwhile, technical guidance is provided for new energy grid-connected planning in continuous development, large-area power failure accidents are avoided, the operation stability of a power system is obviously improved, and the safe operation level of a power grid is improved.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. The automatic generation method of the low-frequency load-reducing distribution scheme suitable for distributed photovoltaic is characterized by comprising the following steps of:
the method comprises the following steps: online real-time modeling of the low-frequency simulation model;
step two: realizing online simulation analysis of the low-frequency load shedding device based on a preset fault set;
step three: the automatic generation of the low-frequency deloading distribution scheme of the distributed photovoltaic is adapted.
2. The automatic generation method of the low-frequency load shedding distribution scheme adaptive to distributed photovoltaics according to claim 1, wherein in the first step, the online real-time modeling of the low-frequency simulation model is to construct an offline power grid load flow and stability calculation model based on PSD-BPA software, and dynamically generate the low-frequency real-time load flow calculation model and the load shedding frequency stability calculation model online in combination with real-time load data of a smart power grid dispatching control system D5000 and real-time load data of a low-frequency load shedding device.
3. The automatic generation method of the low-frequency load-shedding distribution scheme adaptive to the distributed photovoltaic system as claimed in claim 2, wherein in the second step, on the basis of integrating the PSD-BPA power flow and the stable calculation function, a quick calculation function under a preset fault and a quick analysis function of a low-frequency simulation calculation result are researched to meet the online simulation analysis of a plurality of fault sets, a plurality of time sections and a plurality of load shedding schemes.
4. The automatic generation method of the low-frequency load-shedding allocation scheme suitable for distributed photovoltaic of claim 3, wherein in the third step, with the aim of solving the problem of low-frequency load control rate caused by large-scale grid connection of distributed photovoltaic, the low-frequency load-shedding scheme and the control strategy of each turn of the power grid are studied, and the low-frequency load-shedding capacity allocation scheme suitable for distributed photovoltaic of the power grid is worked out.
5. The automatic generation method of the low-frequency load-shedding allocation scheme adaptive to the distributed photovoltaic system according to claim 3, wherein the multithreading calling is used instead on the basis of the integrated PSD-BPA load flow calculation, and a calculation model is finely adjusted by adopting a modification card mode to achieve a quick calculation effect based on a first load flow calculation result.
6. The automatic generation method of the low-frequency load-shedding allocation scheme suitable for distributed photovoltaics according to claim 3, wherein based on the integrated PSD-BPA stable calculation, multithreading calling is used instead, and batch calculation and batch analysis are realized in a batch processing calculation script mode by closing a stable calculation interactive window, so that the on-line calculation requirement is met.
7. The automatic generation method of the low-frequency load-shedding allocation scheme adaptive to the distributed photovoltaic as claimed in claim 4, wherein a solution measure for low load control rate caused by reverse transmission of power flow is formed by combing and counting data of the influence of the distributed photovoltaic on the low-frequency load shedding of the power grid, and a low-frequency load-shedding allocation adjustment constraint strategy adaptive to the distributed photovoltaic is worked out, so that automatic generation of the low-frequency load-shedding allocation scheme is obtained.
8. The automatic generation method of the low-frequency load-shedding distribution scheme adaptive to the distributed photovoltaic system as claimed in claim 4, wherein a time section with a low load control rate according to historical statistics is selected and introduced into the adjusted low-frequency load-shedding distribution scheme, and safety check is performed from two aspects of thermal stability and frequency stability to obtain the low-frequency load-shedding distribution scheme.
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