CN114069630B - Method for evaluating influence of SFC (small form factor) starting working condition of pumped storage power station on station power utilization system - Google Patents
Method for evaluating influence of SFC (small form factor) starting working condition of pumped storage power station on station power utilization system 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
- H02J3/01—Arrangements for reducing harmonics or ripples
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
- F03B13/06—Stations or aggregates of water-storage type, e.g. comprising a turbine and a pump
-
- 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
- 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
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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
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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
- H02J2300/20—The dispersed energy generation being of renewable origin
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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
- Y02E10/20—Hydro energy
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/50—Energy storage in industry with an added climate change mitigation effect
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Abstract
The invention relates to a method for evaluating influence of SFC (small form factor) starting working conditions of a pumped storage power station on a station power system, which comprises the following steps: step 1: constructing an electric model of the full power station on the simulation platform, and judging a harmonic transmission path according to the topology of the station power system and the SFC access point; step 2: according to the harmonic pollution degree of each position, analyzing the influence degree of objects and harmonic waves which possibly cause the power quality problem on the power station; step 3: designing electric energy quality measuring point arrangement according to harmonic influence and planning field test; step 4: performing measuring point arrangement and measurement on site; step 5: performing data analysis on the field measurement result by a section interception method and a Fourier analysis method; step 6: comparing the analysis result with the actual power utilization influence of the plant, if the analysis result is consistent with the actual power utilization influence of the plant, executing the step 7, otherwise returning to the step 1; step 7: and (3) sorting and recording field measurement data and analysis results, and quantifying the influence caused by SFC (small form factor) starting. Compared with the prior art, the method has the advantages of accurate evaluation and the like.
Description
Technical Field
The invention relates to a thermal power generation related technology, in particular to a method for evaluating influence of SFC (small form factor) starting working conditions of a pumped storage power station on a station power utilization system.
Background
With the increasing strictness of the national environmental protection indexes, new and expanded coal-fired, fuel-oil and thermal power units are forbidden in a plurality of areas, and the units such as a gas turbine, a pumped storage and the like are receiving more attention by virtue of the advantages of good environmental protection indexes, convenience in peak regulation and valley filling, rapid start and stop and the like. In the starting process of the gas turbine and when the pumped storage unit enters the working condition of the water pump, the unit is generally driven by SFC (static frequency conversion device) to reach the rated rotation speed from 0, but the electric energy quality and the electricity utilization safety of a factory electricity system can be influenced within the starting time period (3-4 minutes) of the SFC along with the continuous increase of the unit capacity. In addition, in the process of analyzing the power quality problem, the conventional power quality detection device can only record and analyze the data of the power quality in a long time, and the data is distorted when the data is recorded and analyzed once for 30s or 60s, so that the short-time power quality problem cannot be estimated when the data is distorted for a detection object with a large short-time load change. Therefore, each power station lacks a radical cause analysis for the problem of the power system of the plant caused by the SFC starting working condition.
At present, each power station changes the running mode in the station through switching of a switch, so that the problem of a power system for the plant is solved, but the influence degree of SFC starting cannot be quantized to accurately guide the inhibition measures of the problems.
Through retrieval, chinese patent publication No. CN105932701A discloses a pumped storage multi-unit shared SFC starting station service power supply optimizing configuration method, which specifically comprises the following steps: determining the starting sequence of the pumped storage multiple units by taking the principle of least influence on the system voltage quality; the method comprises the steps of optimally configuring a starting power supply of a variable frequency starting device SFC according to a unit starting sequence by taking the principle of least influence on the quality of the power supply of the factory; optimizing and configuring station service electricity according to the starting power supply of the SFC; and starting the pumped storage unit according to the SFC starting power supply and the station service electricity which are optimally configured. However, this prior art still has the following problems:
1. the correlation between SFC starting conditions in the power station and the problems of the power system of the plant lacks a radical cause analysis.
2. In the SFC starting process, the source end power quality cannot be effectively measured in a short time, and the effectiveness of the SFC self-contained filter device and the external LC filter cannot be evaluated.
3. The method lacks powerful theoretical support basis for the current suppression measures of the power plant problem.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an impact assessment method for the SFC starting working condition of the pumped storage power station on the power plant system, which is accurate in assessment.
The aim of the invention can be achieved by the following technical scheme:
according to one aspect of the invention, a method for evaluating influence of SFC starting working conditions of a pumped storage power station on a plant power system is provided, and the method comprises the following steps:
step 1: constructing an electric model of the full power station on the simulation platform, and judging a harmonic transmission path according to the topology of the station power system and the SFC access point;
step 2: according to the harmonic pollution degree of each position, analyzing the influence degree of objects and harmonic waves which possibly cause the power quality problem on the power station;
step 3: designing electric energy quality measuring point arrangement according to harmonic influence and planning field test;
step 4: performing measuring point arrangement and measurement on site;
step 5: performing data analysis on the field measurement result by a section interception method and a Fourier analysis method;
step 6: comparing the test indexes, determining a harmonic pollution path, comparing the analysis result with the actual power utilization influence, if the analysis result is consistent with the actual power utilization influence, executing the step 7, otherwise, returning to the step 1;
step 7: and (3) sorting and recording field measurement data and analysis results, and quantifying the influence caused by SFC (small form factor) starting.
As an optimal technical scheme, in the step 1, PSCAD or RTDS simulation software is adopted, a simulation circuit diagram of the whole power station is built, and a movable model test is carried out.
In the step 2, the different harmonic pollution levels need to be corresponding to the problem of the power plant system.
In the step 3, according to the topology structure of the station service system and different SFC dragging objects and power supply paths, a plurality of SFC dragging modes are formulated, and the different modes are combined with the harmonic propagation paths to study and judge the results and form the wave recording object.
In the step 4, the SFC start-up process belongs to a load with a fast short-time change, and the set recording time must include the whole SFC start-up process or a dragging time period which is easy to cause harmonic pollution, so as to analyze the harmonic change of the start-up process later and to determine whether the 400V in-plant illumination and pump equipment will have an important influence.
As a preferable technical scheme, the duration of the SFC starting process is 3-4 minutes.
In the step 5, the current from the SFC input is increased to the steady state to take X measurement areas, and each measurement area intercepts the original waveform data of Y for fourier analysis.
As a preferable technical scheme, N is 30, and Y is 200ms.
In the step 6, the influence degree of the exceeding time period and the bus electric energy disturbance on the load under the bus is mainly analyzed.
In the step 7, the on-site measured data is completely stored, and the formed conclusion is used as a theoretical basis for the follow-up power quality problem management measures.
Compared with the prior art, the invention has the following advantages:
according to the invention, a complete detection and evaluation method aiming at the influence of the SFC starting working condition on the power plant system is researched and formulated, the range and degree of the influence of the electric energy quality problem on the power plant system are scientifically evaluated, and data support is provided for subsequent scientific treatment.
Drawings
FIG. 1 is an electrical simulation schematic diagram of a four-unit pumped storage power station in accordance with an embodiment of the present invention;
FIG. 2 is a schematic diagram of a recorder arrangement according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a first type of primary impact path according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a second type of primary impact path according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a third type of primary impact path according to an embodiment of the present invention;
fig. 6 is a flow chart of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
As shown in fig. 6, a method for testing influence of a power station SFC start-up condition on a station power system includes the following steps:
step 1: constructing an electric model of the full power station on the simulation platform, and judging a harmonic transmission path according to the topology of the station power system and the SFC access point;
step 2: according to the harmonic pollution degree of each position, analyzing the influence degree of objects and harmonic waves which possibly cause the power quality problem on the power station;
step 3: designing electric energy quality measuring point arrangement according to harmonic influence and planning field test;
step 4: performing measuring point arrangement and measurement on site;
step 5: performing data analysis on the field measurement result by a section interception method and a Fourier analysis method;
step 6: comparing the test indexes, determining a harmonic pollution path, comparing the analysis result with the actual power utilization influence, if the analysis result is consistent with the actual power utilization influence, executing the step 7, otherwise, returning to the step 1;
step 7: the on-site measurement data and the analysis result are arranged and recorded, the influence caused by SFC starting is quantified, and the subsequent treatment measures are guided;
in the step 1, a simulation circuit diagram of a full power station is built by adopting PSCAD or RTDS simulation software, and a movable model test is carried out;
in the step 2, different harmonic pollution levels are required to correspond to the problems of the station service electrical system;
in step 3, a plurality of SFC dragging modes are formulated according to the topology of the station service system and the difference of SFC dragging objects and power supply paths, and the different modes are combined with the research and judgment result of the harmonic wave propagation paths to form a wave recording object;
in step 4, the SFC starting process is within 3-4 minutes, belongs to a load with quicker short-time change, and the set wave recording time must comprise the whole SFC starting process or a dragging time period which is easy to cause harmonic pollution so as to analyze the harmonic change of the starting process later and have important influence on 400V in-factory illumination, pump equipment and the like;
in step 5, starting to rise from SFC input current to steady state to obtain 30 measurement areas, and intercepting 200ms of original waveform data in each measurement area for Fourier analysis;
in the step 6, the influence degree of the exceeding time period and the bus electric energy disturbance on the load under the bus needs to be analyzed in a key way;
in step 7, the field logging data needs to be completely saved, and the formed conclusion is used as a theoretical basis for the follow-up power quality problem management measures.
Specific examples:
the embodiment is based on a certain conventional four-unit pumped storage power station, and the phenomena of stroboscopic and misoperation difficulty of a lighting device in a plant frequently occur in the power station, and mainly illustrates a test method for influencing a power system of the plant when the working condition SFC of the unit water pump is started, and mainly comprises the following steps:
step 1: according to the electric main wiring diagram of the power station, a simulation model shown in fig. 1 is built.
Step 2: according to the operation result of the simulation model, 2 plant high-voltage transformers are respectively connected to 18kV sides of 2 main transformers through switching, only 1 SFC set is connected to 18kV sides of 1 main transformer through switching, and because 2-3 water pump working conditions are usually started, SFC input transformers and plant high-voltage transformers can be connected to the same main transformer. At the moment, harmonic pollution generated when an SFC starts a certain unit is transmitted to an 18kV bus, the 18kV bus is connected with a factory high transformer at the same time, the harmonic pollution is 10kV for the factory, until 400V is used for illumination, and the machine equipment is pumped.
Step 3: considering the distance of each measuring point, two high-speed high-precision (50 kHz/s, 0.2% precision and above) homotype oscilloscopes are arranged, and as shown in figure 2, 7 measuring points can be selected to record the voltage original waveform data of the SFC starting whole process.
Different in-plant wiring modes are set, wave recording measuring points are selected according to main influence paths corresponding to each mode, wave recording synchronism is guaranteed through wireless or wired communication, and whether SFC and plant transformers (CB 1 and CB 2) are the same in main transformer data is compared with the input and the output of the LC filter.
The first type of operation mode is that SFC drags the No. 3 machine, SFC input becomes to be connected with No. 4 main transformer, and the contact switch between 400V lighting 1 section and 2 sections is in an off state. The 10kVII section is connected with the No. 2 main transformer, and the 10kVI section is connected with the No. 3 main transformer. The main test content is 500kV and 400V power quality detection. A review of the power quality affecting critical path is shown in fig. 3.
The second type of operation mode is that SFC drags number 2 machine, SFC input becomes and inserts number 4 main transformer, number 1 high factory becomes and inserts number 3 main transformer, number 2 high factory becomes and inserts number 2 main transformer. The main test content is 18kV and 10kV power quality detection. A review of the power quality affecting critical path is shown in fig. 4.
And the third type of operation mode is that the SFC drags the No. 2 machine, and the SFC input transformer is connected with the No. 2 main transformer. The main test content is 18kV and 10kV power quality detection. A review of the power quality affecting critical path is shown in fig. 5.
Step 4: and carrying out field test according to the actual condition of the power station. The 400V illumination 2-segment voltage of the measuring point can be directly connected into a oscillograph for measurement, and other measuring points need to be indirectly measured by using 0.5-level and above voltage transformers. The 2 wave recorders ensure wave recording synchronism through wireless or wired communication, and are convenient for later data analysis. The arrangement method of all the measuring points is shown in table 1:
TABLE 1
The following two test sequences are shown in tables 2 and 3 according to different connection modes of the power plant.
TABLE 2
TABLE 3 Table 3
Before SFC is started, 2 wave recorders are set to synchronously trigger to start wave recording, and the same wave recording time limit is set to ensure that the SFC is started to be disconnected. And starting the same unit by repeatedly using the SFC according to the test sequence.
Step 5: the original data is divided into 200ms data blocks, the 200ms data blocks are analyzed to obtain distorted waveforms, time curves of voltage dip and frequency change are calculated, and the contents of all subharmonics are obtained through Fourier transformation. And comparing and analyzing the power quality data of the 400V lighting loop under different buses of SFC and factory transformer.
Step 6: and (3) comparing the test indexes, determining a harmonic pollution path, mainly analyzing the influence degree of the exceeding time period and bus electric energy disturbance on the load under the bus, comparing the analysis result with whether the stroboscopic effect of the lighting equipment and the misoperation of the switch actually generated in the factory are consistent, and returning to the step (1) if the stroboscopic effect and the misoperation of the lighting equipment are inconsistent.
Step 7: and (3) sorting and recording field measurement data and analysis results, quantifying the influence caused by SFC starting, and guiding subsequent treatment measures.
While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (10)
1. The method for evaluating the influence of the SFC starting working condition of the pumped storage power station on the power plant system is characterized by comprising the following steps of:
step 1: constructing an electric model of the full power station on the simulation platform, and judging a harmonic transmission path according to the topology of the station power system and the SFC access point;
step 2: according to the harmonic pollution degree of each position, analyzing the influence degree of objects and harmonic waves which possibly cause the power quality problem on the power station;
step 3: designing electric energy quality measuring point arrangement according to harmonic influence and planning field test;
step 4: performing measuring point arrangement and measurement on site;
step 5: performing data analysis on the field measurement result by a section interception method and a Fourier analysis method;
step 6: comparing the test indexes, determining a harmonic pollution path, comparing the analysis result with the actual power utilization influence, if the analysis result is consistent with the actual power utilization influence, executing the step 7, otherwise, returning to the step 1;
step 7: and (3) sorting and recording field measurement data and analysis results, and quantifying the influence caused by SFC (small form factor) starting.
2. The method for evaluating the influence of the SFC starting condition of the pumped storage power station on the power plant system according to claim 1 is characterized in that the step 1 adopts PSCAD or RTDS simulation software to build a simulation circuit diagram of the whole power station and carry out a movable model test.
3. The method for evaluating the influence of the SFC start-up condition of the pumped storage power station on the electric system of the plant according to claim 1, wherein in the step 2, different harmonic pollution levels are required to correspond to the problems of the electric system of the plant.
4. The method for evaluating influence of SFC start-up conditions of a pumped storage power station on a plant power system according to claim 1, wherein in the step 3, a plurality of SFC dragging modes are formulated according to the topology structure of the plant power system and different SFC dragging objects and power supply paths, and the different modes are combined with harmonic propagation paths to study and judge results and form a wave recording object.
5. The method for evaluating the influence of the SFC start-up condition of the pumped storage power station on the electric system of the plant according to claim 1, wherein in the step 4, the SFC start-up process belongs to a load with a relatively fast short-time change, and the set wave recording time must include the whole SFC start-up process or a dragging time period which is liable to cause harmonic pollution so as to analyze the harmonic change of the start-up process later and to determine whether the 400V in-plant illumination and pump equipment have an important influence.
6. The method for evaluating the influence of SFC start-up conditions of a pumped storage power station on a plant power system according to claim 5, wherein the duration of the SFC start-up process is 3-4 minutes.
7. The method for evaluating the influence of the SFC start-up condition of the pumped storage power station on the power plant system according to claim 1, wherein in the step 5, the current starts to rise from the SFC input to the stable state to take X measurement areas, and each measurement area intercepts the original waveform data of Y for Fourier analysis.
8. The method for evaluating the influence of SFC start-up conditions of a pumped storage power station on a plant power system as claimed in claim 7, wherein X is 30 and Y is 200ms.
9. The method for evaluating the influence of the SFC start-up condition of the pumped storage power station on the power plant system according to claim 1, wherein in the step 6, the influence degree of the exceeding time period and the bus electric energy disturbance on the load under the bus is mainly analyzed.
10. The method for evaluating the influence of the SFC start-up condition of the pumped storage power station on the power plant system according to claim 1, wherein in the step 7, the field logging data is completely stored.
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| CN105932701A (en) * | 2016-06-12 | 2016-09-07 | 武汉大学 | Optimization configuration method for pumped storage multi-unit shared SFC starting station service power supply |
| CN107165770A (en) * | 2017-05-22 | 2017-09-15 | 武汉大学 | A kind of hydroenergy storage station unit starting transient state monitoring and safety estimation system and method |
| CN112332723A (en) * | 2019-07-17 | 2021-02-05 | 中国电建集团华东勘测设计研究院有限公司 | Method for estimating starting time of SFC (Small form factor) of pumped storage unit |
| CN113224778A (en) * | 2021-06-01 | 2021-08-06 | 国家电网有限公司华东分部 | Method for optimizing startup and shutdown scheduling of pumped storage power station group of regional power grid |
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