CN114069630A - Method for evaluating influence of pumped storage power station SFC starting working condition on plant power system - Google Patents
Method for evaluating influence of pumped storage power station SFC starting working condition on plant power system Download PDFInfo
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- 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
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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
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
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- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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- 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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- 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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- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention relates to a method for evaluating the influence of the SFC starting working condition of a pumped storage power station on a station power system, which comprises the following steps: step 1: building a full power station electrical model on a simulation platform, and judging a harmonic transmission path according to the topology of the service power system and the SFC access point; step 2: analyzing the influence degree of objects which possibly cause the power quality problem and harmonic waves on the power station according to the harmonic pollution degree of each position; and step 3: designing the distribution of power quality measuring points according to the harmonic influence and planning field test; and 4, step 4: carrying out measurement point arrangement and measurement on site; and 5: performing data analysis on the field measurement result by an interval interception method and a Fourier analysis method; step 6: comparing the analysis result with the actual auxiliary power influence, if the analysis result is consistent with the actual auxiliary power influence, executing the step 7, otherwise, returning to the step 1; and 7: and (4) sorting and recording field measurement data and analysis results, and quantifying the influence caused by SFC starting. Compared with the prior art, the method has the advantages of being accurate in evaluation and the like.
Description
Technical Field
The invention relates to the thermal power generation related technology, in particular to a method for evaluating the influence of the SFC starting working condition of a pumped storage power station on a plant power system.
Background
With the increasingly strict environmental protection indexes of the country, the new construction and extension of coal-fired and oil-fired thermal power generating units are forbidden in many areas, and the gas turbine, the pumped storage unit and the like are paid more attention by virtue of the advantages of good environmental protection indexes, convenience in peak regulation and valley filling, quick start and stop and the like. During 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 to reach the rated rotating speed from 0 through an SFC (static frequency conversion device), but along with the continuous increase of the unit capacity, the electric energy quality and the electricity safety of the power system can be influenced within the starting time period (3-4 minutes) of the SFC. In addition, in the process of analyzing the power quality problem, the conventional power quality detection device can only record and analyze data of power quality for a long time, and record and analyze the data once in 30s or 60s, so that data distortion can be caused to a detection object with large short-time load change, and the short-time power quality problem cannot be evaluated. Therefore, each power station lacks a fundamental cause analysis for the problem of the auxiliary power system caused by the starting working condition of the SFC.
At present, each power station changes an in-station operation mode through switch switching so as to solve the problems of an auxiliary power system, but the influence degree of SFC starting cannot be quantized so as to accurately guide the suppression measures of the problems.
Through retrieval, the chinese patent publication No. CN105932701A discloses a pumped storage multi-unit sharing SFC startup service power supply optimal configuration method, which specifically includes the following steps: determining the starting sequence of the pumped storage multi-unit on the basis of the minimum influence on the voltage quality of the system; optimally configuring a starting power supply of the variable frequency starting device SFC according to a unit starting sequence on the principle of minimum influence on the quality of service voltage; optimally configuring auxiliary power according to the starting power supply of the SFC; and starting the pumped storage unit according to the optimally configured SFC starting power supply and the service power. However, the prior art still has the following problems:
1. a fundamental cause analysis is lacked for the correlation between the starting working condition of the SFC in the power station and the problems of the auxiliary power system.
2. In the starting process of the SFC, the power quality of a source end cannot be effectively measured in a short time, and the effectiveness of an SFC self-contained filter device and an external LC filter cannot be evaluated.
3. And a strong theoretical support basis is lacked for the suppression measure of the current auxiliary power problem.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for evaluating the influence of the SFC starting working condition of the pumped storage power station on a plant power system.
The purpose of the invention can be realized by the following technical scheme:
according to one aspect of the invention, the method for evaluating the influence of the starting working condition of the pumped storage power station SFC on the plant power system comprises the following steps:
step 1: building a full power station electrical model on a simulation platform, and judging a harmonic transmission path according to the topology of the service power system and the SFC access point;
step 2: analyzing the influence degree of objects which possibly cause the power quality problem and harmonic waves on the power station according to the harmonic pollution degree of each position;
and step 3: designing the distribution of power quality measuring points according to the harmonic influence and planning field test;
and 4, step 4: carrying out measurement point arrangement and measurement on site;
and 5: performing data analysis on the field measurement result by an interval interception method and a Fourier analysis method;
step 6: comparing the test indexes, determining a harmonic pollution path, comparing an analysis result with the actual auxiliary power influence, executing the step 7 if the analysis result is consistent with the actual auxiliary power influence, and returning to the step 1 if the analysis result is not consistent with the actual auxiliary power influence;
and 7: and (4) sorting and recording field measurement data and analysis results, and quantifying the influence caused by SFC starting.
As a preferred technical scheme, PSCAD or RTDS simulation software is adopted in the step 1, a simulation circuit diagram of the whole power station is built, and a dynamic simulation test is carried out.
As a preferred technical solution, in the step 2, different harmonic pollution degrees need to correspond to the problem of the service power system.
As a preferred technical solution, in the step 3, according to the topology structure of the plant power system and the difference between the SFC dragging object and the power supply path, several SFC dragging modes are formulated, and the different modes combine with the harmonic propagation path to study and judge the result and form the recording object.
As a preferable technical solution, in the step 4, the SFC starting process belongs to a load with a short-time and fast change, and the set wave recording time must include 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 in the subsequent step and determine whether lighting and pumping equipment in a 400V plant have an important influence.
As a preferable technical scheme, the time length of the SFC starting process is 3-4 minutes.
Preferably, in step 5, X measurement regions are taken from the start of the increase of the SFC input current to the steady state, and the raw waveform data of Y is captured from each measurement region for fourier analysis.
Preferably, N is 30 and Y is 200 ms.
As an optimal technical scheme, in the step 6, the influence degree of the superstandard time period and the electric energy disturbance of the bus on the load under the bus is mainly analyzed.
As a preferred technical scheme, in the step 7, the on-site measuring and recording data is completely stored, and the formed conclusion is used as a theoretical basis for follow-up measures for treating the power quality problem.
Compared with the prior art, the invention has the following advantages:
according to the invention, a set of complete detection and evaluation method aiming at the influence of the SFC starting working condition on the plant power system is researched and formulated, the range and the degree of the influence of the power quality problem on the plant power system are scientifically evaluated, and data support is provided for subsequent scientific treatment.
Drawings
FIG. 1 is a schematic diagram of an electrical simulation of a four-unit pumped-storage power plant in accordance with an embodiment of the present invention;
FIG. 2 is a schematic view of a schematic layout of a recorder according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a first class of primary influence paths in accordance with an embodiment of the present invention;
FIG. 4 is a diagram illustrating a second type of primary influence path according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating a third category of primary influence paths according to an embodiment of the present invention;
FIG. 6 is a flow chart of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
As shown in fig. 6, a method for testing the influence of the start-up condition of the SFC of the power station on the plant power system includes the following steps:
step 1: building a full power station electrical model on a simulation platform, and judging a harmonic transmission path according to the topology of the service power system and the SFC access point;
step 2: analyzing the influence degree of objects which possibly cause the power quality problem and harmonic waves on the power station according to the harmonic pollution degree of each position;
and step 3: designing the distribution of power quality measuring points according to the harmonic influence and planning field test;
and 4, step 4: carrying out measurement point arrangement and measurement on site;
and 5: performing data analysis on the field measurement result by an interval interception method and a Fourier analysis method;
step 6: comparing the test indexes, determining a harmonic pollution path, comparing an analysis result with the actual auxiliary power influence, executing the step 7 if the analysis result is consistent with the actual auxiliary power influence, and returning to the step 1 if the analysis result is not consistent with the actual auxiliary power influence;
and 7: the field measurement data and the analysis result are sorted and recorded, the influence caused by starting the SFC is quantified, and the subsequent treatment measures are guided;
in the step 1, PSCAD or RTDS simulation software is adopted to build a simulation circuit diagram of the whole power station, and a dynamic simulation test is carried out;
in step 2, different harmonic pollution degrees need to correspond to the problems of the auxiliary power system;
in step 3, a plurality of SFC dragging modes are formulated according to the topology of the auxiliary power system and the difference between the SFC dragging object and the power supply path, and the different modes are combined with the harmonic propagation path to study and judge results to form a wave recording object;
in step 4, the SFC starting process is within 3-4 minutes, and belongs to a load with a fast short-time change, and the set wave recording time must include the whole SFC starting process or a dragging time period which is easy to cause harmonic pollution, so that the harmonic change of the starting process can be analyzed subsequently, and whether important influences are generated on lighting, pump equipment and the like in a 400V plant or not can be generated;
in step 5, 30 measurement areas are taken from the SFC input variable current to the steady state, and each measurement area intercepts 200ms of original waveform data to perform Fourier analysis;
in step 6, the influence degree of the overproof time period and the electric energy disturbance of the bus on the load under the bus needs to be analyzed in a key way;
in step 7, the field survey and record data needs to be completely stored, and the formed conclusion is used as a theoretical basis for follow-up measures for treating the power quality problem.
The specific embodiment is as follows:
the embodiment is based on a certain conventional four-unit pumped storage power station, and the phenomena that lighting equipment in a plant is frequently stroboscopic and the switch is difficult to operate are frequently generated in the power station, and the embodiment mainly describes a method for testing the influence on a plant power system when a unit water pump working condition SFC is started, and the method mainly comprises the following steps:
step 1: according to an electrical main wiring diagram of a power station, a simulation model shown in figure 1 is built.
Step 2: according to the operation result of the simulation model, 2 plant high transformers are usually connected to 18kV sides of 2 main transformers through switching, only 1 set of SFCs are connected to 18kV sides of 1 main transformer through switching, and due to the fact that the water pump working conditions are usually started by 2-3 units, the SFC input transformer and the plant high transformers are connected to the same main transformer. At the moment, harmonic pollution generated when the SFC starts a certain unit is transmitted to an 18kV bus, the 18kV bus is simultaneously connected with the high transformer of a factory, and the harmonic can pollute 10kV for the factory until 400V illumination is realized, and the equipment such as a pump is driven.
And step 3: considering the distance of each measuring point, two high-speed high-precision (50kHz/s, 0.2% precision and above) same-type wave recorders are arranged, and as shown in FIG. 2, 7 measuring points are selected to record the voltage original waveform data of the whole SFC starting process.
Different in-plant connection modes are set, the selection of a recording measuring point is carried out according to a main influence path corresponding to each mode, the recording synchronism is ensured through wireless or wired communication, and the data of main transformers whether the input and the exit of the recording LC filter and the SFC are the same with the plant transformers (CB1 and CB2) or not are compared.
The first type of operation mode is that an SFC drags a No. 3 machine, an SFC input transformer is connected to a No. 4 main transformer, and a tie switch between a 400V lighting 1 section and a 2 section is in an off state. The 10kVII section is connected with a No. 2 main transformer, and the 10kVI section is connected with a No. 3 main transformer. The main test contents are 500kV and 400V power quality detection. The key path for investigating the influence of the power quality is shown in fig. 3.
The second type of operation mode is that the SFC drags the No. 2 machine, the SFC input transformer is connected to the No. 4 main transformer, the No. 1 high-level plant transformer is connected to the No. 3 main transformer, and the No. 2 high-level plant transformer is connected to the No. 2 main transformer. The main test content is 18kV and 10kV power quality detection. The key path for investigating the influence of the power quality is shown in fig. 4.
The third type of operation mode is that the SFC drags the No. 2 machine, and the SFC input transformer is connected to the No. 2 main transformer. The main test content is 18kV and 10kV power quality detection. The key path for investigating the influence of the power quality is shown in fig. 5.
And 4, step 4: and carrying out field test according to the actual condition of the power station. 2 segmental voltages of 400V illumination of a measuring point can be directly connected to a wave recorder for measurement, and other measuring points need to be indirectly measured by using a 0.5-level or above voltage transformer. The 2 wave recorders ensure the wave recording synchronism through wireless or wired communication, and are convenient for later data analysis. The arrangement of all stations is shown in table 1:
TABLE 1
There are two test sequences, as shown in tables 2 and 3, according to different connection modes of the power plant.
TABLE 2
TABLE 3
Before the SFC is started, 2 wave recorders are synchronously triggered to start wave recording, and the same wave recording time limit is set to ensure the recorded SFC to start to the disconnection process. The same unit is started by reusing the SFC according to the test sequence.
And 5: and (3) dividing the original data into 200ms data blocks, analyzing and processing to obtain a distorted waveform, calculating a time curve of voltage drop and frequency change, and obtaining the content of each subharmonic through Fourier transform. And comparing and analyzing the power quality data of the LC filter for switching in and out, and comparing and analyzing the power quality data of the 400V lighting circuit under different buses of the SFC and the plant transformer.
Step 6: and (3) determining a harmonic pollution path by contrasting test indexes, mainly analyzing the influence degree of the overproof time period and the bus electric energy disturbance on the load under the bus, comparing an analysis result with whether the stroboflash and the switch misoperation of the lighting equipment actually occur in the plant are consistent or not, and returning to the step 1 if the stroboflash and the switch misoperation are inconsistent.
And 7: and (4) sorting and recording field measurement data and analysis results, quantifying the influence caused by starting the SFC, and guiding subsequent treatment measures.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A method for evaluating the influence of the SFC starting working condition of a pumped storage power station on a plant power system is characterized by comprising the following steps:
step 1: building a full power station electrical model on a simulation platform, and judging a harmonic transmission path according to the topology of the service power system and the SFC access point;
step 2: analyzing the influence degree of objects which possibly cause the power quality problem and harmonic waves on the power station according to the harmonic pollution degree of each position;
and step 3: designing the distribution of power quality measuring points according to the harmonic influence and planning field test;
and 4, step 4: carrying out measurement point arrangement and measurement on site;
and 5: performing data analysis on the field measurement result by an interval interception method and a Fourier analysis method;
step 6: comparing the test indexes, determining a harmonic pollution path, comparing an analysis result with the actual auxiliary power influence, executing the step 7 if the analysis result is consistent with the actual auxiliary power influence, and returning to the step 1 if the analysis result is not consistent with the actual auxiliary power influence;
and 7: and (4) sorting and recording field measurement data and analysis results, and quantifying the influence caused by SFC starting.
2. The method for evaluating the influence of the SFC starting working condition of the pumped storage power station on the plant power system according to claim 1, wherein the step 1 adopts PSCAD or RTDS simulation software to build a simulation circuit diagram of the whole power station and perform dynamic simulation test.
3. The method for evaluating the influence of the SFC starting condition of the pumped storage power station on the service power system as claimed in claim 1, wherein in the step 2, different harmonic pollution degrees need to correspond to the service power system problem.
4. The method for evaluating the influence of the starting working condition of the pumped storage power station SFC on the service power system as claimed in claim 1, wherein in the step 3, according to the topological structure of the service power system and the difference between the SFC dragging object and the power supply path, a plurality of SFC dragging modes are formulated, and the different modes are combined with the harmonic propagation path to study and judge the result and form a wave recording object.
5. The method for evaluating the influence of the startup condition of the pumped storage power station SFC on the plant power system as claimed in claim 1, wherein in the step 4, the startup process of the SFC belongs to a load with a short-time rapid change, and the set wave recording time must include the whole startup process of the SFC or a dragging time period which is easy to cause harmonic pollution, so as to analyze the harmonic change of the startup process and whether 400V lighting and pumping equipment in the plant have important influence or not.
6. The method for evaluating the influence of the SFC starting working condition of the pumped storage power station on the plant power system according to claim 5, wherein the SFC starting process is 3-4 minutes in duration.
7. The method for evaluating the influence of the starting working condition of the pumped storage power station SFC on the plant power system according to claim 1, wherein in the step 5, X measurement areas are taken from the beginning of the rising of the SFC input variable current to the steady state, and each measurement area intercepts Y raw waveform data and carries out Fourier analysis.
8. The method for evaluating the influence of the SFC starting condition of the pumped-storage power station on the plant power system as claimed in claim 7, wherein N is 30 and Y is 200 ms.
9. The method for evaluating the influence of the SFC starting condition of the pumped storage power station on the plant power system according to the claim 1, wherein in the step 6, the influence degree of the overproof time period and the electric energy disturbance of the bus on the load under the bus is mainly analyzed.
10. The method for evaluating the influence of the SFC starting condition of the pumped storage power station on the plant power system according to claim 1, wherein in the step 7, the field logging data is completely stored.
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| CN104124687A (en) * | 2014-08-08 | 2014-10-29 | 南京南瑞继保电气有限公司 | Double-SFC (Static Frequency Converter) system topography structure |
| 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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