CN117578520A - Control system for three-phase energy storage balance load - Google Patents
Control system for three-phase energy storage balance load Download PDFInfo
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- CN117578520A CN117578520A CN202311570959.4A CN202311570959A CN117578520A CN 117578520 A CN117578520 A CN 117578520A CN 202311570959 A CN202311570959 A CN 202311570959A CN 117578520 A CN117578520 A CN 117578520A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 49
- 238000012937 correction Methods 0.000 claims abstract description 55
- 238000004364 calculation method Methods 0.000 claims abstract description 43
- 238000005070 sampling Methods 0.000 claims abstract description 21
- 238000012216 screening Methods 0.000 claims abstract description 10
- 238000012545 processing Methods 0.000 claims abstract description 9
- 238000013480 data collection Methods 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase 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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
-
- 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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- 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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention relates to the technical field of voltage data processing, in particular to a control system of a three-phase energy storage balance load, which comprises the following components: and a data collection module: taking 2pi as an acquisition period, and acquiring curves of output side voltages of the energy storage converter A, B and the C phase in a single acquisition period along with time; and a sampling module: acquiring output side voltage series of the energy storage converter A, B and the C phase from the changed curve at a preset sampling interval t; and a screening module: establishing a three-phase voltage model function, and constructing constraint conditions: and acquiring independent variable value intervals meeting the constraint conditions, and sequentially carrying out voltage correction calculation on the output side voltage in each independent variable value interval. The invention can screen out voltage data with larger error in the sample data and correct the voltage data, thereby ensuring the accuracy of subsequent calculation.
Description
Technical Field
The invention relates to the technical field of voltage data processing, in particular to a control system of a three-phase energy storage balance load.
Background
Three-phase imbalance is an important indicator of power quality, and means that three-phase currents (or voltages) in a power system have inconsistent magnitudes, and the magnitude difference exceeds a specified range. The unbalanced three phases are caused by unbalanced load applied by the power supplies of all phases, and belong to the problem of fundamental wave load configuration. The occurrence of a three-phase imbalance is related to the load characteristics of the user, as well as to the planning and load distribution of the power system. And three-phase imbalance refers to inconsistency in phasor magnitude and angle. The three-phase voltage allowable unbalance degree of the electric energy quality (GB/T15543-1995) is suitable for the rated frequency of alternating current of 50 Hz. In normal operation of an electric power system, voltage unbalance of the point of connection of the PCC due to a negative sequence component, the standard specifies: the allowable unbalance value of the public connection point of the power system in a normal operation mode is 2%, and the allowable unbalance value cannot exceed 4% in a short time.
In the prior art, the patent number is: in CN103986174B, the real part calculation value and the imaginary part calculation value of the phase voltage of the energy storage converter A, B, C are calculated by measuring the output side voltages of the three phases of the energy storage converter A, B and the C, and the calculation error is reduced by taking an average value; however, in the actual calculation process, the measured voltages at the output sides of the three phases A, B and C of the energy storage converter may be inaccurate in sampled data due to grid fluctuation or measurement errors, and in this patent, the acquired data is not corrected, so that the calculation of the real part calculation value and the imaginary part calculation value may be inaccurate.
Disclosure of Invention
The invention aims to provide a control system for a three-phase energy storage balance load, which solves the technical problems.
The aim of the invention can be achieved by the following technical scheme:
a control system for a three-phase energy storage balance load, comprising:
and a data collection module: taking 2 pi as samplingCollecting period, and obtaining a curve U of output side voltage change of the energy storage converter A, B and C phase along with time in a single collecting period a （T）、U b (T) and U c （T）；
And a sampling module: from said profile U of variation at a preset sampling interval t a （T）、U b (T) and U c Obtaining output side voltage series U of energy storage converter A, B and C phase in (T) a =（U a （t），U a （2t），U a （2t），...，U a （nt））、U b =（U b （t），U b （2t），U b （2t），...，U b (nt)) and U c =（U c （t），U c （2t），U c （2t），...，U c (nt)), nt represents the sampling time of the nth sample;
and a screening module: establishing a three-phase voltage model function U (T) =u a （T）+U b （T）+U c (T) constructing constraint conditions:
U（T）＜U*（1-7%）；
U（T）＞U*（1+7%）；
wherein U represents a three-phase voltage;
acquiring an independent variable value interval T meeting the constraint condition in a three-phase voltage model function U (T) 1 、T 2 、T 3 Sequentially carrying out voltage correction calculation on the output side voltage in each independent variable value interval;
and a data processing module: voltage correction calculation according to independent variable value interval T 1 Screening out sampling time in interval T1 as correction time from output side voltage set U a 、U b And U c Screening out elements corresponding to the correction time and generating a correction voltage set U a '、U b ' and U c '；
Respectively obtaining correction voltage sets U a '、U b ' and U c First item U in a1 '、U b1 ' and U c1 'calculate the voltage sum U' =u a1 '+U b1 '+U c1 ' judging the relation between the voltage and the three-phase voltage and between the voltage and the three-phase voltage;
when the sum of voltages U' > U, the voltage U at the output side a1 '、U b1 ' and U c1 ' make corrections, the calculation method is:
；
wherein U is a1 * Representing U a1 ' corrected voltage value, U b1 * Representing U b1 ' corrected voltage value, U c1 * Representing U c1 ' corrected voltage value;
according to the above steps, for the correction voltage set U a '、U b ' and U c Correcting other items in' and obtaining corrected voltage values;
and carrying out voltage correction calculation on the rest independent variable value intervals, and obtaining corrected voltage values.
As a further scheme of the invention: further comprises:
obtaining output side voltages corresponding to all independent variable intervals;
acquiring a corrected voltage value corresponding to the output side voltage;
and acquiring a time node corresponding to the corrected voltage value, and replacing the voltage value of the same time node in the output side voltage sequence with the corrected voltage value.
As a further scheme of the invention: acquiring a voltage array U on the output side after replacement a 、U b And U c The real part calculation values of the energy storage converter A, B and the C phase are calculated, specifically:
；
wherein UA represents the real part calculated value of the phase A of the energy storage converter, UB represents the real part calculated value of the phase B of the energy storage converter, UC represents the real part calculated value of the phase C of the energy storage converter, and N represents the total number of times of sampling.
As a further aspect of the inventionThe scheme is as follows: acquiring a voltage array U on the output side after replacement a 、U b And U c The real part calculation values of the energy storage converter A, B and the C phase are calculated, specifically:
；
UA ' represents the calculated imaginary part of the phase a of the energy storage converter, UB ' represents the calculated imaginary part of the phase B of the energy storage converter, UC ' represents the calculated imaginary part of the phase C of the energy storage converter.
As a further scheme of the invention: in the process of the voltage correction calculation, when the voltage sum U' < U, the voltage U at the output side a1 '、U b1 ' and U c1 ' make corrections, the calculation method is:
；
wherein U is a1 * Representing U a1 ' corrected voltage value, U b1 * Representing U b1 ' corrected voltage value, U c1 * Representing U c1 ' corrected voltage value;
according to the above steps, for the correction voltage set U a '、U b ' and U c The other term in' is corrected and a corrected voltage value is obtained.
As a further scheme of the invention: in the voltage correction calculation, when the output side voltage is corrected, U is corrected h And the voltage U before correction h The difference value delta U is less than or equal to U min When in use, let U h =U h Wherein U is min Representing a preset minimum correction voltage value.
As a further scheme of the invention: in the voltage correction calculation, when the output side voltage is corrected, U is corrected h And the voltage U before correction h The difference value delta U is equal to or larger than U max If so, the correction is abandoned, and the energy storage converter A, B and the energy storage converter under the time node are connectedThe output side voltage of phase C is deleted from said output side voltage series, wherein U max Representing a preset maximum voltage deviation value.
As a further scheme of the invention: the value of the three-phase voltage U is 380V.
The invention has the beneficial effects that: as a three-phase alternating current, the voltage change in the three-phase network is recorded with 2 pi as one acquisition period, and although 2 pi is not a specific time, the corresponding time period can be obtained through 2 pi. Taking a change function of the voltage value and time of three phases in a time period corresponding to 2 pi as initial processing data; in the specific calculation, a sampling method is used for calculating the real part value and the imaginary part value of the voltage; therefore, sampling is adopted to extract a plurality of values from the initial processing data as samples, and a three-phase output side voltage sequence is generated according to time sequence; the three-phase voltage model screens out voltage data with larger errors in sample data on the premise of considering normal fluctuation (+ -7%) of total voltage under the condition of three-phase power consumption, and corrects the three-phase voltage data with larger deviation by taking the three-phase voltage as mathematical expectation according to a proportion method, so that the accuracy of subsequent calculation is ensured.
Drawings
The invention is further described below with reference to the accompanying drawings.
Fig. 1 is a schematic flow chart of a control system of a three-phase energy storage balance load according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the present invention is a control system for a three-phase energy storage balance load, comprising:
data collectionAnd (3) a module: taking 2pi as an acquisition period, and acquiring a curve U of output side voltage changes of the energy storage converter A, B and the C phase along with time in a single acquisition period a （T）、U b (T) and U c （T）；
And a sampling module: from said profile U of variation at a preset sampling interval t a （T）、U b (T) and U c Obtaining output side voltage series U of energy storage converter A, B and C phase in (T) a =（U a （t），U a （2t），U a （2t），...，U a （nt））、U b =（U b （t），U b （2t），U b （2t），...，U b (nt)) and U c =（U c （t），U c （2t），U c （2t），...，U c (nt)), nt represents the sampling time of the nth sample;
and a screening module: establishing a three-phase voltage model function U (T) =u a （T）+U b （T）+U c (T) constructing constraint conditions:
U（T）＜U*（1-7%）；
U（T）＞U*（1+7%）；
wherein U represents a three-phase voltage;
acquiring an independent variable value interval T meeting the constraint condition in a three-phase voltage model function U (T) 1 、T 2 、T 3 Sequentially carrying out voltage correction calculation on the output side voltage in each independent variable value interval;
and a data processing module: voltage correction calculation according to independent variable value interval T 1 Screening out sampling time in interval T1 as correction time from output side voltage set U a 、U b And U c Screening out elements corresponding to the correction time and generating a correction voltage set U a '、U b ' and U c '；
Respectively obtaining correction voltage sets U a '、U b ' and U c First item U in a1 '、U b1 ' and U c1 'calculate the voltage sum U' =u a1 '+U b1 '+U c1 ' judging the relation between the voltage and the three-phase voltage and between the voltage and the three-phase voltage;
when the sum of voltages U' > U, the voltage U at the output side a1 '、U b1 ' and U c1 ' make corrections, the calculation method is:
；
wherein U is a1 * Representing U a1 ' corrected voltage value, U b1 * Representing U b1 ' corrected voltage value, U c1 * Representing U c1 ' corrected voltage value;
according to the above steps, for the correction voltage set U a '、U b ' and U c Correcting other items in' and obtaining corrected voltage values;
and carrying out voltage correction calculation on the rest independent variable value intervals, and obtaining corrected voltage values.
In this embodiment, further comprising:
obtaining output side voltages corresponding to all independent variable intervals;
acquiring a corrected voltage value corresponding to the output side voltage;
and acquiring a time node corresponding to the corrected voltage value, and replacing the voltage value of the same time node in the output side voltage sequence with the corrected voltage value.
It will be appreciated that as a three-phase alternating current, the voltage change in the three-phase network is recorded with 2pi as one acquisition period, although 2pi is not specifically referred to as time, the corresponding time period may be obtained by 2pi. Taking a change function of the voltage value and time of three phases in a time period corresponding to 2 pi as initial processing data; in the specific calculation, a sampling method is used for calculating the real part value and the imaginary part value of the voltage; therefore, sampling is adopted to extract a plurality of values from the initial processing data as samples, and a three-phase output side voltage sequence is generated according to time sequence; the three-phase voltage model screens out voltage data with larger errors in sample data on the premise of considering normal fluctuation (+ -7%) of total voltage under the condition of three-phase power consumption, and corrects the three-phase voltage data with larger deviation by taking the three-phase voltage as mathematical expectation according to a proportion method, so that the accuracy of subsequent calculation is ensured.
As a further scheme of the invention: acquiring a voltage array U on the output side after replacement a 、U b And U c The real part calculation values of the energy storage converter A, B and the C phase are calculated, specifically:
；
wherein UA represents the real part calculated value of the phase A of the energy storage converter, UB represents the real part calculated value of the phase B of the energy storage converter, UC represents the real part calculated value of the phase C of the energy storage converter, and N represents the total number of times of sampling.
In a preferred embodiment of the invention, the output side voltage sequence U after the replacement is obtained a 、U b And U c The real part calculation values of the energy storage converter A, B and the C phase are calculated, specifically:
；
UA ' represents the calculated imaginary part of the phase a of the energy storage converter, UB ' represents the calculated imaginary part of the phase B of the energy storage converter, UC ' represents the calculated imaginary part of the phase C of the energy storage converter.
In a preferred embodiment of the invention, the output side voltage U is calculated during said voltage correction when the voltage sum U' < U a1 '、U b1 ' and U c1 ' make corrections, the calculation method is:
；
wherein U is a1 * Representing U a1 ' corrected voltage value, U b1 * Representing U b1 ' corrected voltage value, U c1 * Representing U c1 ' modified voltageA value;
according to the above steps, for the correction voltage set U a '、U b ' and U c The other term in' is corrected and a corrected voltage value is obtained.
In a preferred embodiment of the present invention, in the voltage correction calculation, when the correction calculation is performed on the output side voltage, the corrected U h And the voltage U before correction h The difference value delta U is less than or equal to U min When in use, let U h =U h Wherein U is min Representing a preset minimum correction voltage value.
As a further scheme of the invention: in the voltage correction calculation, when the output side voltage is corrected, U is corrected h And the voltage U before correction h The difference value delta U is equal to or larger than U max If so, discarding the correction and deleting the output side voltages of the energy storage converter A, B and the C phase at the time node from the output side voltage series, wherein U max Representing a preset maximum voltage deviation value.
In a preferred embodiment of the invention, the three-phase voltage U has a value of 380V.
The foregoing describes one embodiment of the present invention in detail, but the description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by the present invention.
Claims (8)
1. A control system for a three-phase energy storage balance load, comprising:
and a data collection module: taking 2pi as an acquisition period, and acquiring a curve U of output side voltage changes of the energy storage converter A, B and the C phase along with time in a single acquisition period a （T）、U b (T) and U c （T）；
And a sampling module: from said profile U of variation at a preset sampling interval t a （T）、U b (T) and U c Obtaining output side voltage series U of energy storage converter A, B and C phase in (T) a =（U a （t），U a （2t），U a （2t），...，U a （nt））、U b =（U b （t），U b （2t），U b （2t），...，U b (nt)) and U c =（U c （t），U c （2t），U c （2t），...，U c (nt)), nt represents the sampling time of the nth sample;
and a screening module: establishing a three-phase voltage model function U (T) =u a （T）+U b （T）+U c (T) constructing constraint conditions:
U（T）＜U*（1-7%）；
U（T）＞U*（1+7%）；
wherein U represents a three-phase voltage;
acquiring an independent variable value interval T meeting the constraint condition in a three-phase voltage model function U (T) 1 、T 2 、T 3 Sequentially carrying out voltage correction calculation on the output side voltage in each independent variable value interval;
and a data processing module: voltage correction calculation according to independent variable value interval T 1 Screening out sampling time in interval T1 as correction time from output side voltage set U a 、U b And U c Screening out elements corresponding to the correction time and generating a correction voltage set U a '、U b ' and U c '；
Respectively obtaining correction voltage sets U a '、U b ' and U c First item U in a1 '、U b1 ' and U c1 'calculate the voltage sum U' =u a1 '+U b1 '+U c1 ' judging the relation between the voltage and the three-phase voltage and between the voltage and the three-phase voltage;
when the sum of voltages U' > U, the voltage U at the output side a1 '、U b1 ' and U c1 ' make corrections, the calculation method is:
；
wherein U is a1 * Representing U a1 ' corrected voltage value, U b1 * Representing U b1 ' corrected voltage value, U c1 * Representing U c1 ' corrected voltage value;
according to the above steps, for the correction voltage set U a '、U b ' and U c Correcting other items in' and obtaining corrected voltage values;
and carrying out voltage correction calculation on the rest independent variable value intervals, and obtaining corrected voltage values.
2. The control system of a three-phase energy storage balance load of claim 1, further comprising:
obtaining output side voltages corresponding to all independent variable intervals;
acquiring a corrected voltage value corresponding to the output side voltage;
and acquiring a time node corresponding to the corrected voltage value, and replacing the voltage value of the same time node in the output side voltage sequence with the corrected voltage value.
3. The control system of claim 2, wherein the output side voltage sequence U after the replacement is obtained a 、U b And U c The real part calculation values of the energy storage converter A, B and the C phase are calculated, specifically:
；
wherein UA represents the real part calculated value of the phase A of the energy storage converter, UB represents the real part calculated value of the phase B of the energy storage converter, UC represents the real part calculated value of the phase C of the energy storage converter, and N represents the total number of times of sampling.
4. The control system of claim 2, wherein the output side voltage sequence U after the replacement is obtained a 、U b And U c The real part calculation values of the energy storage converter A, B and the C phase are calculated, specifically:
；
UA ' represents the calculated imaginary part of the phase a of the energy storage converter, UB ' represents the calculated imaginary part of the phase B of the energy storage converter, UC ' represents the calculated imaginary part of the phase C of the energy storage converter.
5. The control system of claim 1, wherein during said voltage correction calculation, when the sum of the voltages is less than U, the output voltage U is equal to a1 '、U b1 ' and U c1 ' make corrections, the calculation method is:
；
wherein U is a1 * Representing U a1 ' corrected voltage value, U b1 * Representing U b1 ' corrected voltage value, U c1 * Representing U c1 ' corrected voltage value;
according to the above steps, for the correction voltage set U a '、U b ' and U c The other term in' is corrected and a corrected voltage value is obtained.
6. The control system of claim 5, wherein in the voltage correction calculation, when the output side voltage is corrected, the corrected U h And the voltage U before correction h The difference value delta U is less than or equal to U min When in use, let U h =U h Wherein U is min Representing a preset minimum correctionVoltage value.
7. The control system of claim 5, wherein in the voltage correction calculation, when the output side voltage is corrected, the corrected U h And the voltage U before correction h The difference value delta U is equal to or larger than U max If so, discarding the correction and deleting the output side voltages of the energy storage converter A, B and the C phase at the time node from the output side voltage series, wherein U max Representing a preset maximum voltage deviation value.
8. The control system of claim 1, wherein the three-phase voltage U has a value of 380V.
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