CN114142477A - Three-phase zero-voltage ride through reactive current calculation method and system based on voltage section continuation - Google Patents
Three-phase zero-voltage ride through reactive current calculation method and system based on voltage section continuation Download PDFInfo
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- CN114142477A CN114142477A CN202111406078.XA CN202111406078A CN114142477A CN 114142477 A CN114142477 A CN 114142477A CN 202111406078 A CN202111406078 A CN 202111406078A CN 114142477 A CN114142477 A CN 114142477A
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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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
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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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- 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
- Y02E40/30—Reactive power compensation
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Abstract
The invention discloses a three-phase zero voltage ride through reactive current calculation method and a system based on voltage section continuation, and the method comprises the steps of obtaining test data of a three-phase zero voltage ride through test of an energy storage power station; positioning a voltage drop section according to test data, taking three-phase balanced voltage data with specified duration before the voltage drop section as a fitting data source, and performing function fitting according to the fitting data source to obtain a positive sequence voltage fitting function; positioning the current surge section according to the test data, taking the current data of the current surge section as a fitting data source, and performing function fitting according to the fitting data source to obtain a positive sequence current fitting function; in the voltage drop section, the fitting positive sequence current in the positive sequence current fitting function is projected to the fitting positive sequence voltage in the positive sequence voltage fitting function to obtain the positive sequence reactive current, so that the positive sequence reactive current quantitative calculation of the three-phase zero voltage ride-through test of the energy storage station can be realized, and the result of the three-phase zero voltage ride-through test is quantitatively analyzed.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a three-phase zero-voltage ride-through reactive current calculation method and system based on voltage section continuation.
Background
The large-scale development of electrochemical energy storage puts higher and higher requirements on the functions of control equipment, and the current national standard and industrial standard require that when the voltage of a power grid drops, an energy storage power station has low voltage ride through capability, namely, a Power Conversion System (PCS) of the energy storage station is required to operate without grid disconnection as required in the process of grid dropping, and meanwhile, reactive current support is provided for the power grid. Thus, during a low voltage ride through, the main phenomenon that occurs is a drop in voltage accompanied by a sudden increase in current. For energy storage stations, low voltage ride through capability is a necessary core function, and a low voltage ride through test is a critical test for testing the performance of PCS. The current standard requires calculating positive sequence reactive current in the low voltage ride through process to evaluate the reactive support capability, but the calculation method of the positive sequence reactive current under the condition of three-phase zero voltage ride through is not explicitly described. When the non-zero voltage passes through, the voltage drop degree is not deep, the conventional voltage transformer can accurately calculate the voltage amplitude and the phase, but when the three-phase zero voltage passes through, the three-phase voltage amplitude drops to be close to a zero value, the voltage waveform of a power grid is distorted and deformed, and the phase calculation cannot be performed according to the measured value of the voltage transformer. From the side of the power grid, the amplitude and the phase of the outlet voltage of the generator are kept stable, the voltage at a drop point is only changed in the three-phase zero-voltage ride-through process, and the output voltage of the generator in the power grid is the same as that before the drop, so that the outlet voltage of the generator can be used as a voltage reference. For the PCS, since actual voltage cannot be sampled in a three-phase zero-voltage drop section, voltage information before a fault is kept in a control algorithm and is extended to the fault section, and a control quantity of reactive current is calculated according to normal voltage fitted in the fault section. Therefore, according to the fact that the output voltages of the generators are consistent before and after the voltage drop and the actual implementation condition of the control algorithm of the PCS, the voltage section after the virtual voltage drop after the extension of the voltage section before the voltage drop can be used as a normal voltage section for calculating the positive sequence reactive current.
Therefore, according to the requirement on the sequential reactive current calculation in the zero voltage ride through of the energy storage station, a three-phase zero voltage ride through reactive current calculation method based on voltage section continuation is needed, the three-phase zero voltage ride through result in the low voltage ride through test of the energy storage station can be quantitatively calculated, and accurate reference is provided for judging the specific performance of equipment. Currently, the related prior art is: prior art [1 ]: lijiaman, Wanwenjun, Suwei, and the like, design and test of a high-capacity energy storage mobile grid-connected test device [ J ] Guangdong electric power [ 2020,33(10):9-15 ] prior art [2 ]: the photovoltaic inverter low voltage ride through test system [ J ] is based on a virtual instrument technology, an electrical measurement and instrument [ 2015,52(14):71-75 ] is characterized in that a mobile test device suitable for grid-connected detection of a large-capacity energy storage system is designed in the prior art [1], low voltage ride through test is carried out on site, and the designed device can simulate different fault types and complete various tests of low voltage ride through, but fails to explain an analysis method of a result during three-phase zero voltage ride through. In the prior art [2], a photovoltaic inverter low-voltage ride-through test system based on a virtual instrument technology is designed, so that real-time monitoring and test result evaluation of alternating-current side voltage and current of a photovoltaic inverter in a low-voltage ride-through test process are realized, key index calculation methods such as active power recovery and dynamic reactive support of the photovoltaic inverter low-voltage ride-through test are researched, but measurement and analysis of three-phase zero-voltage ride-through are not explained.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: aiming at the problems in the prior art, the invention provides a three-phase zero-voltage ride-through reactive current calculation method and a three-phase zero-voltage ride-through reactive current calculation system based on voltage section continuation.
In order to solve the technical problems, the invention adopts the technical scheme that:
a three-phase zero voltage ride through reactive current calculation method based on voltage section continuation comprises the following steps:
1) acquiring test data of a three-phase zero voltage ride through test of the energy storage power station;
2) positioning a voltage drop section according to test data, taking three-phase balanced voltage data with specified duration before the voltage drop section as a fitting data source, and performing function fitting according to the fitting data source to obtain a positive sequence voltage fitting function; positioning the current surge section according to the test data, taking the current data of the current surge section as a fitting data source, and performing function fitting according to the fitting data source to obtain a positive sequence current fitting function;
3) and in the voltage drop section, projecting the fitting positive sequence current in the positive sequence current fitting function to the fitting positive sequence voltage in the positive sequence voltage fitting function to obtain the positive sequence reactive current.
Optionally, step 1) is preceded by a step of performing a three-phase zero voltage ride through test on the energy storage power station to obtain test data of the three-phase zero voltage ride through test.
Optionally, the value range of the specified duration in the step 2) is 0.5-1.5 s.
Optionally, the value of the specified duration in step 2) is 1 s.
Optionally, the test data of the three-phase zero-voltage ride-through test includes voltage data and current data.
Optionally, the performing function fitting according to the fitting data source in step 2) to obtain a positive sequence voltage fitting function includes: and performing Fast Fourier Transform (FFT) on the voltage data serving as a fitting data source to obtain a dominant frequency, and performing function fitting on the mapping relation between time and voltage to obtain a positive sequence voltage fitting function.
Optionally, the performing function fitting according to the fitting data source in step 2) to obtain a positive sequence current fitting function includes: and performing Fast Fourier Transform (FFT) on the current data serving as a fitting data source to obtain a dominant frequency, and performing function fitting on the mapping relation between time and current to obtain a positive sequence current fitting function.
Optionally, the fitting function parameters include amplitude Amp, frequency f and initial phase Φ of the sine wave.
In addition, the present embodiment also provides a three-phase zero voltage ride through reactive current calculation system based on voltage section continuation, which includes a microprocessor and a memory connected to each other, wherein the microprocessor is programmed or configured to execute the steps of the three-phase zero voltage ride through reactive current calculation method based on voltage section continuation.
Furthermore, the present embodiment also provides a computer-readable storage medium, in which a computer program for being executed by a computer device to implement the voltage section continuation based three-phase zero voltage ride through reactive current calculation method is stored.
Compared with the prior art, the invention mainly has the following advantages: the method comprises the steps of obtaining test data of a three-phase zero voltage ride through test of the energy storage power station; positioning a voltage drop section according to test data, taking three-phase balanced voltage data with specified duration before the voltage drop section as a fitting data source, and performing function fitting according to the fitting data source to obtain a positive sequence voltage fitting function; positioning the current surge section according to the test data, taking the current data of the current surge section as a fitting data source, and performing function fitting according to the fitting data source to obtain a positive sequence current fitting function; in the voltage drop section, the fitting positive sequence current in the positive sequence current fitting function is projected to the fitting positive sequence voltage in the positive sequence voltage fitting function to obtain the positive sequence reactive current, so that the positive sequence reactive current quantitative calculation of the three-phase zero voltage ride-through test of the energy storage station can be realized, and the result of the three-phase zero voltage ride-through test is quantitatively analyzed.
Drawings
FIG. 1 is a schematic diagram of a basic flow of a method according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of a fitting waveform according to an embodiment of the present invention.
Detailed Description
The following will further describe the three-phase zero-voltage-ride-through reactive current calculation method and system based on voltage section continuation, taking the three-phase zero-voltage-ride-through positive-sequence reactive current calculation for a certain energy storage power station as an example. In the embodiment, the scale of the energy storage power station is 20MW/40MWh, an electrochemical energy storage technology is adopted, and a lithium iron phosphate battery is selected as the battery.
As shown in fig. 1, the method for calculating three-phase zero-voltage-ride through reactive current based on voltage zone continuation in this embodiment includes:
1) acquiring test data of a three-phase zero voltage ride through test of the energy storage power station;
2) positioning a voltage drop section according to test data, taking three-phase balanced voltage data with specified duration before the voltage drop section as a fitting data source, and performing function fitting according to the fitting data source to obtain a positive sequence voltage fitting function; positioning the current surge section according to the test data, taking the current data of the current surge section as a fitting data source, and performing function fitting according to the fitting data source to obtain a positive sequence current fitting function;
3) and in the voltage drop section, projecting the fitting positive sequence current in the positive sequence current fitting function to the fitting positive sequence voltage in the positive sequence voltage fitting function to obtain the positive sequence reactive current.
In this embodiment, step 1) further includes a step of performing a three-phase zero voltage ride through test on the energy storage power station to obtain test data of the three-phase zero voltage ride through test.
The value range of the specified duration in the step 2) is 0.5-1.5 s.
As a specific implementation manner, the value of the specified duration in this embodiment is 1 s.
In this embodiment, the test data of the three-phase zero-voltage ride through test includes voltage data and current data.
In this embodiment, the step 2) of performing function fitting according to the fitting data source to obtain the positive sequence voltage fitting function includes: and performing Fast Fourier Transform (FFT) on the voltage data serving as a fitting data source to obtain a dominant frequency, and performing function fitting on the mapping relation between time and voltage to obtain a positive sequence voltage fitting function. In this embodiment, the parameters of the fitting function include an amplitude Amp, a frequency f, and an initial phase Φ of a sine wave of the voltage data, and the function expression of the positive sequence voltage fitting function is:
in this embodiment, the step 2) of performing function fitting according to the fitting data source to obtain the positive sequence current fitting function includes: and performing Fast Fourier Transform (FFT) on the current data serving as a fitting data source to obtain a dominant frequency, and performing function fitting on the mapping relation between time and current to obtain a positive sequence current fitting function. In this embodiment, the parameters of the fitting function include an amplitude Amp, a frequency f, and an initial phase Φ of a sine wave of the current data, and the function expression of the obtained positive sequence current fitting function is as follows:
the calculation result in this embodiment is shown in fig. 2, and in the low voltage ride through process, the phenomenon that the zero voltage ride through section appears is mainly characterized by voltage drop and current surge, that is, the voltage drop section and the current surge section appear respectively. Wherein: and a, comparing the original waveform of the voltage UA of the phase A voltage of the zero-voltage crossing section with the waveform of the fitting voltage UA, wherein the fault occurs in 17.70 seconds, the voltage waveform before the fault is symmetrical and stable, obtaining a voltage fitting function through the voltage before the fault, and using the voltage section after virtual drop after the voltage fitting function is extended as a normal voltage section. b, comparing the original waveform of the phase A current IA of the zero-voltage crossing section with the waveform of the IA fitting current, wherein the fault occurs in 17.70 seconds, the current waveform in the fault is symmetrical and stable, and a current fitting function is obtained through the current in the fault. c is the comparison of the fitting waveform of the phase A current IA and the fitting waveform of the phase A voltage UA of the zero voltage ride-through section, and the phase difference between the fitting waveform and the phase A voltage UA is about 90 degrees, which is basically consistent with the fact that the active power output is suppressed to 0 and the main output is reactive power when the three-phase zero voltage ride-through is carried out. d is in the voltage drop interval, the positive sequence fitting current is projected to the positive sequence fitting voltage to obtain the phase difference delta phi and the positive sequence reactive current IQ. According to the calculation result, the phase difference delta phi is about 87 degrees and is consistent with the main output reactive power, IQ is calculated to be about 147A through the delta phi, and the value can be used for quantitatively judging the PCS three-phase zero voltage ride through performance.
In addition, the present embodiment also provides a three-phase zero voltage ride through reactive current calculation system based on voltage section continuation, which includes a microprocessor and a memory connected to each other, wherein the microprocessor is programmed or configured to execute the steps of the aforementioned three-phase zero voltage ride through reactive current calculation method based on voltage section continuation. Furthermore, the present embodiment also provides a computer-readable storage medium, in which a computer program is stored, for execution by a computer device to implement the aforementioned three-phase zero voltage ride through reactive current calculation method based on voltage section continuation.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-readable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks. These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks. These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (10)
1. A three-phase zero voltage ride through reactive current calculation method based on voltage section continuation is characterized by comprising the following steps:
1) acquiring test data of a three-phase zero voltage ride through test of the energy storage power station;
2) positioning a voltage drop section according to test data, taking three-phase balanced voltage data with specified duration before the voltage drop section as a fitting data source, and performing function fitting according to the fitting data source to obtain a positive sequence voltage fitting function; positioning the current surge section according to the test data, taking the current data of the current surge section as a fitting data source, and performing function fitting according to the fitting data source to obtain a positive sequence current fitting function;
3) and in the voltage drop section, projecting the fitting positive sequence current in the positive sequence current fitting function to the fitting positive sequence voltage in the positive sequence voltage fitting function to obtain the positive sequence reactive current.
2. The voltage section continuation-based three-phase zero voltage ride-through reactive current calculation method according to claim 1, wherein step 1) is preceded by a step of performing a three-phase zero voltage ride-through test on the energy storage power station to obtain test data of the three-phase zero voltage ride-through test.
3. The voltage section continuation-based three-phase zero-voltage ride-through reactive current calculation method according to claim 1, wherein the specified duration in the step 2) is in a value range of 0.5-1.5 s.
4. The voltage section continuation-based three-phase zero-voltage-ride-through reactive current calculation method according to claim 3, wherein the value of the specified time duration in the step 2) is 1 s.
5. The voltage segment continuation-based three-phase zero voltage ride-through reactive current calculation method of claim 1, wherein test data of the three-phase zero voltage ride-through test comprises voltage data and current data.
6. The voltage section continuation-based three-phase zero voltage ride-through reactive current calculation method according to claim 5, wherein the step 2) of performing function fitting according to the fitting data source to obtain a positive sequence voltage fitting function comprises: and performing Fast Fourier Transform (FFT) on the voltage data serving as a fitting data source to obtain a dominant frequency, and performing function fitting on the mapping relation between time and voltage to obtain a positive sequence voltage fitting function.
7. The voltage section continuation-based three-phase zero voltage ride-through reactive current calculation method according to claim 5, wherein the step 2) of performing function fitting according to the fitting data source to obtain a positive sequence current fitting function comprises: and performing Fast Fourier Transform (FFT) on the current data serving as a fitting data source to obtain a dominant frequency, and performing function fitting on the mapping relation between time and current to obtain a positive sequence current fitting function.
8. The voltage section continuation-based three-phase zero-voltage-ride-through reactive current calculation method of claim 7, wherein a dominant frequency of a fitting waveform is obtained through FFT, and then an amplitude value Amp and an initial phase phi of a fitting function are obtained through fitting.
9. A voltage section continuation based three-phase zero voltage ride through reactive current calculation system comprising a microprocessor and a memory connected to each other, wherein the microprocessor is programmed or configured to perform the steps of the voltage section continuation based three-phase zero voltage ride through reactive current calculation method according to any one of claims 1 to 8.
10. A computer-readable storage medium, wherein a computer program is stored in the computer-readable storage medium for execution by a computer device to implement the voltage zone continuation based three-phase zero-voltage-ride-through reactive current calculation method of any one of claims 1 to 8.
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