CN107621582A - The Online Transaction Processing and its method of work of combining inverter and electric capacity - Google Patents
The Online Transaction Processing and its method of work of combining inverter and electric capacity Download PDFInfo
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- CN107621582A CN107621582A CN201710819231.9A CN201710819231A CN107621582A CN 107621582 A CN107621582 A CN 107621582A CN 201710819231 A CN201710819231 A CN 201710819231A CN 107621582 A CN107621582 A CN 107621582A
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- voltage
- electric capacity
- capacitance
- bridge inverter
- transaction processing
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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
- G01R31/40—Testing power supplies
- G01R31/42—AC power supplies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2605—Measuring capacitance
Abstract
The present invention relates to a kind of combining inverter and the Online Transaction Processing and its method of work of electric capacity, the Online Transaction Processing, including：HBridge inverter, shouldHBridge inverter is controlled by a control unit；The method of work of the Online Transaction Processing, including：Described in described control unit is establishedHThe input of bridge inverter, output voltage database, by described in collectionHIn the input of bridge inverter, output voltage and database shouldHBridge inverter input, output voltage compare, to judgeHWhether electric bridge inverter damages.
Description
Technical field
The present invention relates to a kind of field of power electronics, more particularly to a kind of distributed electrical source grid-connected inverter and electric capacity
The method of work of line test system.
Background technology
As originally more distributed generation systems accesses power network, various countries' grid company all carries to distributed generation system
New strict demand is gone out, that is, has required that distributed generation system can continue to be incorporated into the power networks and sent when power network breaks down
Work(idle supports power network.Therefore distributed generation system will carry out the test of power network adaptability before grid-connected, so
And because the target of power network is to provide the three phase sine voltage of standard, various forms of electric network faults are not common.Therefore right
When distributed generation system is tested, only by power network be difficult reproduction be out of order situation, it is necessary to special equipment or instrument come
Simulate above-mentioned failure.
The content of the invention
It is an object of the invention to provide the work of a kind of distributed electrical source grid-connected inverter and the Online Transaction Processing of electric capacity
Method, is which solved pairHBridge inverter carries out the technical problem of on-line checking.
In order to solve the above-mentioned technical problem, the invention provides the online of a kind of distributed electrical source grid-connected inverter and electric capacity
The method of work of test system, wherein, the Online Transaction Processing includes：HBridge inverter, shouldHBridge inverter is by a control
Unit controls；The method of work of the Online Transaction Processing includes：Described in described control unit is establishedHThe input of bridge inverter,
Output voltage database, by described in collectionHIn the input of bridge inverter, output voltage and database shouldHBridge inverter is defeated
Enter, output voltage compares, with judgeHWhether electric bridge inverter damages.
Further, the Online Transaction Processing also includes：It is described for carrying out the capacity measurement unit of electric capacity on-line checking
The method of work of capacity measurement unit comprises the following steps：
Step 1：The voltage vector at measured capacitance both ends is gathered, and the voltage vector is decomposited into fundamental voltageWithnIt is secondary
Harmonic voltage component, i.e. the superimposed voltage at the measured capacitance both ends, i.e.,, it is folded to calculate this
Alive virtual valueU, the virtual value of fundamental voltageU 0。
Step 2：Electric capacity sound pressure level database is established, the database includes：All types of electric capacity are in only each fundamental voltage
Virtual value distinguish corresponding to electric capacity sound pressure level.
Default measured capacitance type, rated capacitanceC 0, according to measured capacitance type and the virtual value of current fundamental voltageU 0
Corresponding capacitance sound pressure level is obtained from the electric capacity sound pressure level database。
Voice signal caused by measured capacitance is gathered, to obtain corresponding capacitance sound pressure level, pass through formula, calculate the actual capacitance of measured capacitanceC x 。
Step 3：According to the actual capacitance of measured capacitanceC x With the virtual value of superimposed voltageUEstablish capacitance and estimate public affairs
Formula, i.e.,；Wherein,CExtreme capacitance values when being damaged for measured capacitance,tFor capacitance damage expeced time,kFor list
Virtual value of the measured capacitance in current fundamental voltage in the time of positionU 0Electric capacitance change coefficient corresponding to lower, i.e., wherein,C x1WithC x2For the capacitance initial value and final value of measured capacitance in the unit time.
Set the extreme capacitance valuesC, capacitance damage expeced time is derived by the capacitance predictor formulatMeter
Formula is calculated, i.e.,, to calculate the expeced time that measured capacitance is damaged.
Further, the virtual value of the superimposed voltageUPass through fundamental voltageWithnSubharmonic voltage component's
The square root of virtual value quadratic sum obtains.
Further, it is describednSubharmonic voltage componentInnTake 5.
The above-mentioned technical proposal of the present invention has advantages below compared with prior art：（1）The present invention is single by the control
Described in member is establishedHThe input of bridge inverter, output voltage database, by described in collectionHThe input of bridge inverter, output electricity
Pressure and being somebody's turn to do in databaseHBridge inverter input, output voltage compare, to judgeHWhether electric bridge inverter damages, this method
With simple in real time, the advantages of good reliability；（2）The present invention combines ultrasonic sensor and High Frequency Current Sensor,
The on-line checking of power supply need not be closed by realizing；（3）The present invention gathers electric capacity caused by measured capacitance by ultrasonic sensor
Sound pressure level；The magnitude of voltage at High Frequency Current Sensor collection electric capacity both ends, establishes capacitance predictor formula, utilizes the formula pair
The life-span of measured capacitance is predicted, and judges that the electric capacity life-span more has than traditional only detection capacitance present actual capacitance
Have perspective.
Brief description of the drawings
In order that present disclosure is more likely to be clearly understood, below according to specific embodiment and with reference to accompanying drawing,
The present invention is further detailed explanation, wherein
Fig. 1 is the structured flowchart of the Online Transaction Processing；
Fig. 2 is the theory diagram of the capacity measurement unit；
Fig. 3 is the flow chart of the method for work of the capacity measurement unit.
Embodiment
To make the object, technical solutions and advantages of the present invention of greater clarity, with reference to embodiment and join
According to accompanying drawing, the present invention is described in more detail.It should be understood that these descriptions are merely illustrative, and it is not intended to limit this hair
Bright scope.In addition, in the following description, the description to known features and technology is eliminated, to avoid unnecessarily obscuring this
The concept of invention.
Embodiment 1
As shown in figure 1, a kind of method of work of the Online Transaction Processing of distributed electrical source grid-connected inverter and electric capacity, wherein, institute
Stating Online Transaction Processing includes：HBridge inverter, shouldHBridge inverter is controlled by a control unit；The Online Transaction Processing
Method of work include：Described in described control unit is establishedHThe input of bridge inverter, output voltage database, by gathering
StateHIn the input of bridge inverter, output voltage and database shouldHBridge inverter input, output voltage compare, to judgeH
Whether electric bridge inverter damages.
The present invention by usingIGBTSwitching technique builds three-phaseHBridge inverter, control unit pairHElectric bridge is accordingly controlled
The technical scheme of system is disclosed in lot of documents, such as：EMSEMS can realize above-mentioned control function.
Described in described control unit is establishedHThe step of input of bridge inverter, output voltage database, includes：By to each
TypeHThe input of bridge inverter, output voltage are sampled to obtain standard value, that is, establish the input, output voltage number
According to storehouse, when control unit detect it is testedHBridge inverter is under present input voltage, its output voltage and the output in database
Voltage is not inconsistent, that is, judging shouldHBridge inverter failure.
To input, output voltage be acquired, can by step-down transformer,ADModule, processor unit are realized, are belonged to
In prior art.
Embodiment 2
As shown in Fig. 2 the Online Transaction Processing on the basis of embodiment 1 also includes：For carrying out electric capacity on-line checking
Capacity measurement unit, the capacity measurement unit include：
Ultrasonic sensor, for gathering voice signal caused by measured capacitance, to obtain corresponding capacitance sound pressure level。
High Frequency Current Sensor, for gathering the voltage vector at electric capacity both ends.
The ultrasonic sensor, High Frequency Current Sensor pass through corresponding data conditioning unit and data processing and control respectively
Unit is connected；That is, ultrasonic sensor, High Frequency Current Sensor respectively by first, second data conditioning unit and numerical control at
Reason control unit is connected, and first, second data conditioning unit can use the certain proportion being made up of integrated operational amplifier
Amplifier.
The data processing and control subelement, including：
Electric capacity superimposed voltage computing module, suitable for the voltage vector of acquisition is decomposited into fundamental voltageWithnSubharmonic voltage
Component, i.e. the superimposed voltage at the measured capacitance both ends, i.e.,, calculate the superimposed voltage
Virtual valueU, while calculate the virtual value of fundamental voltageU 0；Wherein, it is to pass through to obtain harmonic wave and the method for fundamental waveFFTComputing obtains
Arrive, this method existing a large amount of descriptions in the prior art document, such as：Outstanding in the September, 2009 of Li Jiasheng, bavin generation is published in periodical
《Electric power system protection and control》On paper " electric energy quality harmonic m-Acetyl chlorophosphonazo on-line quick detection technique study " in existing phase
Close description.
Capacitance computing module, suitable for according to default measured capacitance type, rated capacitanceC 0, pass through the electric capacity acoustic pressure
DBMS storehouse obtains measured capacitance electric capacity sound pressure level corresponding with the virtual value of only each fundamental voltage；Pass through measured capacitance
Caused voice signal, to obtain corresponding capacitance sound pressure level, pass through formula, calculate tested electricity
The actual capacitance of appearanceC x ；Wherein, the electric capacity sound pressure levelObtained by way of establishing electric capacity sound pressure level database, i.e.,
All types of electric capacity electric capacity sound pressure level corresponding with the virtual value of each fundamental voltage is stored with the database, passes through default input quilt
The type of survey electric capacity, and the currently virtual value of fundamental voltage obtained by calculating, are somebody's turn to do from electric capacity sound pressure level database lookup
Electric capacity acoustic pressure DBMS corresponding to electric capacity；Calculate corresponding capacitance sound pressure levelMethod in paper document：In June, 2010 delivers
In《Electronic technology journal》The capacitor noise level calculation method based on vibration signal in be disclosed.
Measured capacitance life-span computing module, suitable for the actual capacitance according to measured capacitanceC x With the virtual value of superimposed voltageUCapacitance predictor formula is established, i.e.,；Wherein,CExtreme capacitance values when being damaged for measured capacitance,tDamaged for electric capacity
Bad expeced time,kFor measured capacitance in the unit time current fundamental voltage virtual valueU 0Electric capacitance change system corresponding to lower
Number, i.e., whereinC x1WithC x2For in the virtual value of current fundamental voltageU 0Under unit interval in be tested electricity
The capacitance initial value and final value of appearance；Electric capacitance change coefficientkCan be according to all types of electric capacity under the virtual value of each fundamental voltage
The electric capacitance change coefficient data storehouse established by actual measurement obtains, and the electric capacitance change coefficient data storehouse is according to electric capacity model and phase
The virtual value of fundamental voltage is answered to search to obtain electric capacitance change coefficient corresponding to the electric capacityk, its specific acquisition methods：Various fundamental waves
Capacitance initial value and final value of the measured all types of electric capacity within a period of time under the virtual value of voltage, then converse a list
Corresponding capacitance initial value and final value in the time of position, according to current fundamental wave obtained by the type of default measured capacitance, and calculating
The virtual value of voltage, that is searched from electric capacitance change coefficient data storehouse goes out electric capacitance change coefficient corresponding to the electric capacityk, in order to
It is easy to calculate, if variable quantity of the electric capacity within the unit interval is linear；And electricity is derived by the capacitance predictor formula
Hold and damage expeced timetCalculation formula, i.e.,, set the extreme capacitance valuesC, to calculate measured capacitance
The expeced time of damage.
The superimposed voltageVirtual valueUComputational methods include：Fundamental voltageWithnSubharmonic voltage componentVirtual value quadratic sum square root.It is describednSubharmonic voltage componentInnTake 5.
The data processing and control subelement passes throughFPGAModule is realized, i.e.FPGAChipXC6SLX9-TQG144。
Table 1 is experimental data and actual measurement comparing result one, and the electric capacitor of table 1 selects huge magnificent electric capacitorBSMJ-
0.415-15-3 15Kvar, set the extreme capacitance valuesCFor the 40% of former capacity.
The experimental data of table 1 and the actual measurement table of comparisons
Wherein, electric capacitance change coefficient is being calculatedkWhen, the unit interval is 24 hours, i.e., 525VUnder fundamental wave virtual value, one day
Capacitance change is 0.08 through actual measurementuF。
Table 2 is experimental data and actual measurement comparing result two, and the electric capacitor of table 2 selects Shanghai Wei Sikang electric capacitorsBSMJ0.4-15-3 and electric capacityBSMJ0.45-15-3, set the extreme capacitance valuesCFor the 40% of former capacity.
The experimental data of table 2 and the actual measurement table of comparisons
Wherein, electric capacitance change coefficient is being calculatedkWhen, the unit interval is 24 hours, i.e., 450VUnder fundamental wave virtual value, one day
Capacitance change is 0.12 through actual measurementuF；Or 415VUnder fundamental wave virtual value, the capacitance change of one day is by actual measurement
0.11uF。
Table 3 is experimental data and actual measurement comparing result three, and the electric capacitor of table 3 selects De Lixi self-healing low-voltage capacitors
The parallel power condenserBSMJS0.4 20-3 BSMJ, set the extreme capacitance valuesCFor the 40% of former capacity.
The experimental data of table 3 and the actual measurement table of comparisons
Wherein, electric capacitance change coefficient is being calculatedkWhen, the unit interval is 24 hours, i.e., 380VUnder fundamental wave virtual value, one day
Capacitance change is 0.063 through actual measurementuF。
Fundamental wave virtual value in the present invention is it is also assumed that be voltage effective value ideally.
From table 1 to table 3 as can be seen that the present invention electric capacity on-line checking estimate electric capacity remaining time be it is effective,
With accuracy it is high the characteristics of, extreme capacitance values when close to electric capacity actual capacitance close to capacitance damageCWhen, settled accounts
As a result closer to measured result.Therefore, the Online Transaction Processing can complete necessary electric capacity on-line checking, and it, which detects data, is
It is sufficiently close to real data, can be completely used for estimating electric capacity service life.
Embodiment 3
As shown in figure 3, on the basis of embodiment 2, there is provided the method for work of the Online Transaction Processing, wherein, it is described online
Test system also includes：For carrying out the capacity measurement unit of electric capacity on-line checking, the method for work of the capacity measurement unit
Comprise the following steps：
StepS100, obtain superimposed voltage, the virtual value of fundamental voltage at measured capacitance both ends.
The voltage vector at measured capacitance both ends is gathered, and the voltage vector is decomposited into fundamental voltageWithnSubharmonic
Component of voltage, i.e. the superimposed voltage at the measured capacitance both ends, i.e.,, calculate superposition electricity
The virtual value of pressureU, while calculate the virtual value of fundamental voltageU 0；Wherein, it is to pass through to obtain harmonic wave and the method for fundamental waveFFTComputing
Obtain, this method existing a large amount of descriptions in the prior art document, such as：Outstanding in the September, 2009 of Li Jiasheng, bavin generation is published in periodical
《Electric power system protection and control》On paper " electric energy quality harmonic m-Acetyl chlorophosphonazo on-line quick detection technique study " in existing phase
Close description.Electric capacity is electric capacitor in the present invention.
StepS200, obtain the actual capacitance of measured capacitance.
Electric capacity sound pressure level database is established, the database includes：All types of electric capacity are effective only each fundamental voltage
It is worth electric capacity sound pressure level corresponding to distinguishing.
Default measured capacitance type, rated capacitanceC 0, measured capacitance is obtained by the electric capacity sound pressure level database and existed
The virtual value of current fundamental voltageU 0Electric capacity sound pressure level corresponding to lower；Voice signal caused by measured capacitance is gathered, to obtain
Corresponding capacitance sound pressure level, pass through formula, calculate the actual capacitance of measured capacitanceC x ；Wherein,
The electric capacity sound pressure levelObtained, i.e., be stored with the database all types of by way of establishing electric capacity sound pressure level database
Electric capacity electric capacity sound pressure level corresponding with the virtual value of only each fundamental voltage, by the type of default input measured capacitance, and
The virtual value of current fundamental voltage obtained by calculating, electric capacity acoustic pressure corresponding to the electric capacity is obtained from electric capacity sound pressure level database lookup
DBMS；Wherein, only each fundamental voltage refers to no harmonic voltage；Calculate corresponding capacitance sound pressure levelMethod in paper
Document：In June, 2010 is published in《Electronic technology journal》The capacitor noise level calculation method based on vibration signal in by
It is open.
StepS300, by establishing capacitance predictor formula, calculate the expeced time that measured capacitance is damaged.
StepS310, establish capacitance predictor formula and electric capacitance change coefficientkCalculation formula.
According to the actual capacitance of measured capacitanceC x With the virtual value of superimposed voltageUCapacitance predictor formula is established, i.e.,；Wherein,CExtreme capacitance values when being damaged for measured capacitance,tFor capacitance damage expeced time,kFor the unit time
Virtual value of the interior measured capacitance in current fundamental voltageU 0Electric capacitance change coefficient corresponding to lower, i.e.,C x1WithC x2For in the virtual value of current fundamental voltageU 0Under unit interval in measured capacitance capacitance initial value and final value；Electric capacity quantitative change
Change coefficientkThe electric capacitance change coefficient that can be established according to the virtual value of all types of electric capacity and only each fundamental voltage by actual measurement
Database obtains, and this is searched in the electric capacitance change coefficient data storehouse according to the virtual value of electric capacity model and corresponding fundamental voltage
Electric capacitance change coefficient corresponding to electric capacityk, its specific acquisition methods：It is all types of measured by under the virtual value of various fundamental voltages
Capacitance initial value and final value of the electric capacity within a period of time, then converse corresponding capacitance initial value and end in a unit interval
Value, according to the virtual value of current fundamental voltage obtained by the type of default measured capacitance, and calculating, from electric capacitance change coefficient
That is searched in database goes out electric capacitance change coefficient corresponding to the electric capacityk, for the ease of calculating, if electric capacity is within the unit interval
Variable quantity is linear.
StepS320, calculate the expeced time that measured capacitance is damaged.
Capacitance damage expeced time is derived by the capacitance predictor formulatCalculation formula, i.e.,If
The fixed extreme capacitance valuesC, to calculate the service life of the expeced time that measured capacitance is damaged, i.e. measured capacitance；Its
In, extreme capacitance valuesCBy being manually set, the threshold value that also gives a warning for capacitance, it is easy to carry out online evaluation to electric capacity.
Further, the virtual value of the superimposed voltageUPass through fundamental voltageWithnSubharmonic voltage component's
The square root of virtual value quadratic sum obtains.
Further, it is contemplated that harmonic energy is distributed, describednSubharmonic voltage componentInnTake 5.
It should be appreciated that the above-mentioned embodiment of the present invention is used only for exemplary illustration or explains the present invention's
Principle, without being construed as limiting the invention.Therefore, that is done without departing from the spirit and scope of the present invention is any
Modification, equivalent substitution, improvement etc., should be included in the scope of the protection.In addition, appended claims purport of the present invention
Covering the whole changes fallen into scope and border or this scope and the equivalents on border and repairing
Change example.
Claims (1)
1. the method for work of the Online Transaction Processing of a kind of distributed electrical source grid-connected inverter and electric capacity, it is characterised in that described
Online Transaction Processing includes：HBridge inverter, shouldHBridge inverter is controlled by a control unit；
The method of work of the Online Transaction Processing includes：Described in described control unit is establishedHThe input of bridge inverter, output electricity
Database is pressed, by described in collectionHIn the input of bridge inverter, output voltage and database shouldHBridge inverter inputs, is defeated
Go out voltage to compare, to judgeHWhether electric bridge inverter damages；
The Online Transaction Processing also includes：For carrying out the capacity measurement unit of electric capacity on-line checking；
The capacity measurement unit includes：
Ultrasonic sensor, for gathering voice signal caused by measured capacitance, to obtain corresponding capacitance sound pressure level；
High Frequency Current Sensor, for gathering the voltage vector at electric capacity both ends；
The ultrasonic sensor, High Frequency Current Sensor pass through corresponding data conditioning unit and data processing control units respectively
It is connected；
The data processing and control subelement, including：Electric capacity superimposed voltage computing module；
Described method of work, including：
Electric capacity superimposed voltage computing module by the voltage vector of acquisition decomposite fundamental voltage andnSubharmonic voltage component, i.e. institute
State the superimposed voltage at measured capacitance both ends, i.e. calculate the virtual value of the superimposed voltageU, while calculate the virtual value of fundamental voltageU 0；Wherein, it is to pass through to obtain harmonic wave and the method for fundamental waveFFTComputing obtains.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2014102568832 | 2014-06-11 | ||
| CN201410256883 | 2014-06-11 | ||
| CN201410479833.0A CN105203865B (en) | 2014-06-11 | 2014-09-18 | The method of work of the Online Transaction Processing of distributed electrical source grid-connected inverter and electric capacity |
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| CN201410479833.0A Division CN105203865B (en) | 2014-06-11 | 2014-09-18 | The method of work of the Online Transaction Processing of distributed electrical source grid-connected inverter and electric capacity |
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| CN107621582B CN107621582B (en) | 2019-12-24 |
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| CN201710794762.7A Active CN107436415B (en) | 2014-06-11 | 2014-09-18 | Working method of online testing system for distributed power grid-connected inverter and capacitor |
| CN201710819231.9A Active CN107621582B (en) | 2014-06-11 | 2014-09-18 | Online testing system for grid-connected inverter and capacitor and working method thereof |
| CN201410479833.0A Active CN105203865B (en) | 2014-06-11 | 2014-09-18 | The method of work of the Online Transaction Processing of distributed electrical source grid-connected inverter and electric capacity |
| CN201710794720.3A Expired - Fee Related CN107589324B (en) | 2014-06-11 | 2014-09-18 | Online testing system for grid-connected inverter and capacitor |
| CN201710794765.0A Active CN107561410B (en) | 2014-06-11 | 2014-09-18 | Online testing system for distributed power supply grid-connected inverter and capacitor |
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| CN201710794720.3A Expired - Fee Related CN107589324B (en) | 2014-06-11 | 2014-09-18 | Online testing system for grid-connected inverter and capacitor |
| CN201710794765.0A Active CN107561410B (en) | 2014-06-11 | 2014-09-18 | Online testing system for distributed power supply grid-connected inverter and capacitor |
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| CN107436415B (en) * | 2014-06-11 | 2020-12-08 | 合肥布诺太阳能科技有限公司 | Working method of online testing system for distributed power grid-connected inverter and capacitor |
| CN109596875B (en) * | 2018-12-04 | 2023-08-18 | 国网湖北省电力有限公司电力科学研究院 | Method and device for detecting waveform abnormality of output voltage of H-bridge power unit |
| CN109596894A (en) * | 2019-01-02 | 2019-04-09 | 厦门科华恒盛股份有限公司 | Ac capacitor on-line monitoring method and device |
| CN112564287A (en) * | 2020-12-12 | 2021-03-26 | 国网新源控股有限公司回龙分公司 | Simple system for monitoring running state of power equipment |
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| 张鹏: "电力电容器在线监测技术研究", 《中国优秀硕士学位论文全文数据库 工程科技II辑》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107436415B (en) | 2020-12-08 |
| CN107589324A (en) | 2018-01-16 |
| CN105203865A (en) | 2015-12-30 |
| CN107589324B (en) | 2019-12-27 |
| CN107436415A (en) | 2017-12-05 |
| CN105203865B (en) | 2017-10-27 |
| CN107561410B (en) | 2021-04-27 |
| CN107621582B (en) | 2019-12-24 |
| CN107561410A (en) | 2018-01-09 |
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