CN107147138A - Three-phase and four-line power distribution network compensation equipment DC capacitor detection method, apparatus and system - Google Patents
Three-phase and four-line power distribution network compensation equipment DC capacitor detection method, apparatus and system Download PDFInfo
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- CN107147138A CN107147138A CN201710384912.7A CN201710384912A CN107147138A CN 107147138 A CN107147138 A CN 107147138A CN 201710384912 A CN201710384912 A CN 201710384912A CN 107147138 A CN107147138 A CN 107147138A
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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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- 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
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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
Abstract
The embodiment of the present application discloses a kind of three-phase and four-line power distribution network compensation equipment DC capacitor detection method, apparatus and system, and the three-phase that equipment is compensated by obtaining three-phase and four-line power distribution network compensates current instantaneous value, and both positive and negative polarity DC voltage instantaneous value；Zero sequence compensation current amplitude and DC voltage deviation fundamental voltage amplitude are calculated, to calculate the DC capacitor that three-phase and four-line power distribution network compensates equipment；This method need not stop the operation that three-phase and four-line power distribution network compensates equipment, can detect direct current capacitance during three-phase and four-line power distribution network compensation equipment normally operation, the direct current capacitance that can compensate three-phase and four-line power distribution network equipment carries out continuation monitoring.
Description
Technical field
The application is related to technical field of electric power, more particularly to a kind of compensation equipment DC capacitor detection of three-phase and four-line power distribution network
Method, apparatus and system.
Background technology
In three-phase and four-line power distribution network, a large amount of single-phase power loads are mixed with three-phase power load, are easily caused power distribution network defeated
Electric line laod unbalance problem is serious, influence transformer capacity and transmission line loss, and even change can be burnt when serious
Depressor.In this regard, generally utilizing switch on-off capacitor bank in the industry, control the problem of to three-phase and four-line power distribution network laod unbalance
Reason.But, switch on-off capacitor bank can only realize that level is adjusted, and electricity of the meeting to power distribution network during capacitor group switching
Pressure and electric current cause serious impact, other equipment may be caused to damage when serious.With the development of technology, one kind is occurred in that in the industry
The new method that the problem of to three-phase and four-line power distribution network laod unbalance is administered, i.e., compensate equipment simultaneously by three-phase and four-line power distribution network
It is associated on three-phase and four-line power distribution network, Synthetic is carried out to three-phase and four-line power distribution network reactive current, out-of-balance current harmonic electric current
Reason, so as to improve distribution network electric energy quality and electrical safety, while power distribution network ability to transmit electricity can be significantly improved, reduces power transmission line
Path loss consumes.
Fig. 1 to Fig. 3 is referred to, at present, the circuit structure of three-phase and four-line power distribution network compensation equipment mainly includes, diode clamp
Position three-level topology type, and split capacitor formula three-level topology type, wherein, diode clamp three-level topology type includes I types
Diode clamp three-level topology type and T-shaped diode clamp three-level topology type.Three-phase and four-line power distribution network compensation equipment is used
Electrochemical capacitor supports DC voltage, when carrying out zero sequence current compensation to three-phase four-wire system power distribution network, can be flowed through in electrochemical capacitor
Larger fundamental wave alternating current, meanwhile, the high-frequency switching currents of three-phase and four-line power distribution network compensation equipment will also pass through DC capacitor
Circulation, and after three-phase and four-line power distribution network compensation equipment long-play, electrochemical capacitor value can be reduced substantially, cause three-phase and four-line to be matched somebody with somebody
The compensation function of power network compensation equipment is affected, therefore, in order to find that three-phase and four-line power distribution network compensates equipment direct current in time
The exception of appearance, to take measures on customs clearance, the DC capacitor that three-phase and four-line power distribution network compensates equipment, which is monitored, to be become very
It is important.The monitoring method of the existing direct current capacitance for compensating three-phase and four-line power distribution network equipment, generally in three-phase and four-line distribution
The moment that net compensation equipment is started or stoped, using additional detection device, the direct current of equipment is compensated three-phase and four-line power distribution network
Capacitance is monitored.
However, because above-mentioned monitoring method needs to stop the operation that three-phase and four-line power distribution network compensates equipment, therefore, can influence
Three-phase and four-line power distribution network compensates compensation effect of the equipment to three-phase and four-line power distribution network.
The content of the invention
The application provides a kind of three-phase and four-line power distribution network compensation equipment DC capacitor detection method, apparatus and system, to solve
Certainly existing monitoring method can influence three-phase and four-line power distribution network to compensate the problem of equipment is to the compensation effect of three-phase and four-line power distribution network.
In a first aspect, the embodiment of the present application provides a kind of three-phase and four-line power distribution network compensation equipment DC capacitor detection method,
Methods described comprises the following steps：
The three-phase compensation current instantaneous value of acquisition three-phase and four-line power distribution network compensation equipment, and both positive and negative polarity DC voltage are instantaneous
Value；
Current instantaneous value is compensated according to the three-phase, zero sequence compensation current amplitude is calculated；
According to the both positive and negative polarity DC voltage instantaneous value, DC voltage deviation fundamental voltage amplitude is calculated；
According to the zero sequence compensation current amplitude and the DC voltage deviation fundamental voltage amplitude, calculate the three-phase and four-line and match somebody with somebody
The DC capacitor of power network compensation equipment.
Optionally, current instantaneous value is compensated according to the three-phase, calculates zero sequence compensation current amplitude, including：
According to
iz=(ia+ib+ic)/3
The zero-sequence current in compensation electric current is calculated, wherein, izIt is to compensate the zero-sequence current in electric current, ia、ib、icIt is three-phase
Compensate current instantaneous value；
According to the zero-sequence current in the compensation electric current, the zero sequence compensation current amplitude is calculated.
Optionally, according to the both positive and negative polarity DC voltage instantaneous value, DC voltage deviation fundamental voltage amplitude is calculated, including：
According to
udc_err=udc1-udc2
Both positive and negative polarity DC voltage difference is calculated, wherein, udc_errIt is both positive and negative polarity DC voltage difference, udc1It is positive DC voltage wink
Duration, udc2It is negative DC instantaneous voltage；
According to the both positive and negative polarity DC voltage difference, the DC voltage deviation fundamental voltage amplitude is calculated.
Optionally, according to the zero sequence compensation current amplitude and the DC voltage deviation fundamental voltage amplitude, described three are calculated
The line power distribution network of phase four compensates the DC capacitor of equipment, including：
If the circuit structure type of the three-phase and four-line power distribution network compensation equipment is diode clamp three-level topology type,
According to
The DC capacitor that the three-phase and four-line power distribution network compensates equipment is calculated, wherein, C is that the compensation of three-phase and four-line power distribution network is set
Standby DC capacitor, Iz_magIt is zero sequence compensation current amplitude, Uerr_magIt is DC voltage deviation fundamental voltage amplitude, maIt is control system
Modulation ratio, ω is fundamental wave angular frequency；
If the circuit structure type of the three-phase and four-line power distribution network compensation equipment is split capacitor formula three-level topology type,
According to
The DC capacitor that the three-phase and four-line power distribution network compensates equipment is calculated, wherein, C is that the compensation of three-phase and four-line power distribution network is set
Standby DC capacitor, Iz_magIt is zero sequence compensation current amplitude, Uerr_magIt is DC voltage deviation fundamental voltage amplitude, ω is fundamental wave angular frequency
Rate.
Second aspect, the embodiment of the present application also provides a kind of three-phase and four-line power distribution network compensation equipment DC capacitor detection dress
Put, described device includes：
Acquiring unit, the three-phase for obtaining three-phase and four-line power distribution network compensation equipment compensates current instantaneous value, and positive and negative
Pole DC voltage instantaneous value；
First computing unit, for compensating current instantaneous value according to the three-phase, calculates zero sequence compensation current amplitude；
Second computing unit, for according to the both positive and negative polarity DC voltage instantaneous value, calculating DC voltage deviation fundamental wave width
Value；
3rd computing unit, for according to the zero sequence compensation current amplitude and the DC voltage deviation fundamental voltage amplitude,
Calculate the DC capacitor that the three-phase and four-line power distribution network compensates equipment.
Optionally, first computing unit includes：
First computation subunit, for basis
iz=(ia+ib+ic)/3
The zero-sequence current in compensation electric current is calculated, wherein, izIt is to compensate the zero-sequence current in electric current, ia、ib、icIt is three-phase
Compensate current instantaneous value；
Second computation subunit, for the zero-sequence current in the compensation electric current, calculates the zero sequence compensation electric current
Amplitude.
Optionally, second computing unit includes：
3rd computation subunit, for basis
udc_err=udc1-udc2
Both positive and negative polarity DC voltage difference is calculated, wherein, udc_errIt is both positive and negative polarity DC voltage difference, udc1It is positive DC voltage wink
Duration, udc2It is negative DC instantaneous voltage；
4th computation subunit, for according to the both positive and negative polarity DC voltage difference, calculating the DC voltage deviation fundamental wave
Amplitude.
Optionally, the 3rd computing unit is used for：
If the circuit structure type of the three-phase and four-line power distribution network compensation equipment is diode clamp three-level topology type,
According to
The DC capacitor that the three-phase and four-line power distribution network compensates equipment is calculated, wherein, C is that the compensation of three-phase and four-line power distribution network is set
Standby DC capacitor, Iz_magIt is zero sequence compensation current amplitude, Uerr_magIt is DC voltage deviation fundamental voltage amplitude, maIt is control system
Modulation ratio, ω is fundamental wave angular frequency；
If the circuit structure type of the three-phase and four-line power distribution network compensation equipment is split capacitor formula three-level topology type,
According to
The DC capacitor that the three-phase and four-line power distribution network compensates equipment is calculated, wherein, C is that the compensation of three-phase and four-line power distribution network is set
Standby DC capacitor, Iz_magIt is zero sequence compensation current amplitude, Uerr_magIt is DC voltage deviation fundamental voltage amplitude, ω is fundamental wave angular frequency
Rate.
From above technical scheme, a kind of three-phase and four-line power distribution network compensation equipment direct current that the embodiment of the present application is provided
Hold detection method, apparatus and system, the three-phase that equipment is compensated by obtaining three-phase and four-line power distribution network compensates current instantaneous value, and
Both positive and negative polarity DC voltage instantaneous value；Current instantaneous value is compensated according to three-phase, zero sequence compensation current amplitude is calculated；It is straight according to both positive and negative polarity
Instantaneous voltage is flowed, DC voltage deviation fundamental voltage amplitude is calculated；According to zero sequence compensation current amplitude and DC voltage deviation fundamental wave
Amplitude, calculates the DC capacitor that three-phase and four-line power distribution network compensates equipment；Parameter needed for this method is mended for three-phase and four-line power distribution network
The three-phase compensation current instantaneous value of equipment, and both positive and negative polarity DC voltage instantaneous value are repaid, these parameters are three-phase and four-line power distribution networks
The parameter that must be detected during normal operation, without increasing other detections and test equipment, therefore will not increase it is extra into
This；This method is calculated merely with the zero-sequence component and DC voltage detection value in compensation electric current, it is not necessary to stop three-phase four
The compensation equipment operation of line power distribution network, need not more increase other extra output components, therefore do not interfere with three-phase and four-line power distribution network
Normal operation and compensation effect；In addition, this method is passed through during three-phase and four-line power distribution network compensation equipment normally operation
Algorithm monitors direct current capacitance, rather than compensates moment for starting or stoping of equipment to direct current capacitance in three-phase and four-line power distribution network
It is monitored, it is obvious to decline in capacitance therefore, it is possible to carry out continuation monitoring to direct current capacitance, equipment may be influenceed
Timely alarm during normal operation.
Brief description of the drawings
In order to illustrate more clearly of the technical scheme of the application, letter will be made to the required accompanying drawing used in embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without having to pay creative labor,
Other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the circuit structure diagram that I type diode clamp three-level topology type three-phase and four-lines power distribution network compensates equipment.
Fig. 2 is the circuit structure diagram that T-shaped diode clamp three-level topology type three-phase and four-line power distribution network compensates equipment.
Fig. 3 is the circuit structure diagram that split capacitor formula three-level topology type three-phase and four-line power distribution network compensates equipment.
Fig. 4 compensates the flow of equipment DC capacitor detection method for the three-phase and four-line power distribution network that the embodiment of the present application is provided
Figure.
Fig. 5 compensates the structure of equipment DC capacitor detection means for the three-phase and four-line power distribution network that the embodiment of the present application is provided
Figure.
Fig. 6 compensates the signal of equipment DC capacitor detecting system for the three-phase and four-line power distribution network that the embodiment of the present application is provided
Figure.
Embodiment
As shown in figure 4, a kind of three-phase and four-line power distribution network compensation equipment DC capacitor detection provided for the embodiment of the present application
The flow chart of method, this method comprises the following steps：
Step S1, obtains the three-phase compensation current instantaneous value of three-phase and four-line power distribution network compensation equipment, and both positive and negative polarity direct current
Instantaneous voltage.
In the actual line power distribution network of three line four, in order to ensure that the normal table of the line power distribution network of three line four is run, generally need
Three-phase is wanted to compensate current instantaneous value and both positive and negative polarity DC voltage instantaneous value, that is to say, that three-phase compensates current instantaneous value and positive and negative
Pole DC voltage instantaneous value is the parameter that must be detected when the line power distribution network of three line four is normally run, and therefore, this step can be direct
The parameter detected when the line power distribution network of three line four is normally run is obtained, it is necessary to which additional detection device, will not increase and detect into
This.
Step S2, current instantaneous value is compensated according to three-phase, calculates zero sequence compensation current amplitude.
Specifically, current instantaneous value is compensated according to three-phase, calculates zero sequence compensation current amplitude, including：
According to
iz=(ia+ib+ic)/3
The zero-sequence current in compensation electric current is calculated, wherein, izIt is to compensate the zero-sequence current in electric current, ia、ib、icIt is three-phase
Compensate current instantaneous value.
According to the zero-sequence current in compensation electric current, zero sequence compensation current amplitude I is calculatedz_mag。
Wherein it is possible to pass through single-phase DQ conversion and LPF algorithm, or single-phase DQ conversion and FFT
(English：FastFourierTransform, abbreviation：FFT) algorithm, obtains zero sequence compensation current amplitude Iz_mag。
Step S3, according to both positive and negative polarity DC voltage instantaneous value, calculates DC voltage deviation fundamental voltage amplitude.
Specifically, according to both positive and negative polarity DC voltage instantaneous value, DC voltage deviation fundamental voltage amplitude is calculated, including：
According to
udc_err=udc1-udc2
Both positive and negative polarity DC voltage difference is calculated, wherein, udc_errIt is both positive and negative polarity DC voltage difference, udc1It is positive DC voltage wink
Duration, udc2It is negative DC instantaneous voltage.
According to both positive and negative polarity DC voltage difference, DC voltage deviation fundamental voltage amplitude U is calculatederr_mag。
Wherein it is possible to by single-phase DQ conversion and LPF algorithm, or single-phase DQ conversion and fft algorithm, obtain straight
Flow voltage deviation fundamental voltage amplitude Uerr_mag。
Step S4, according to zero sequence compensation current amplitude and DC voltage deviation fundamental voltage amplitude, calculates three-phase and four-line power distribution network
Compensate the DC capacitor of equipment.
At present, three-phase and four-line power distribution network compensation equipment circuit structure be typically I type diode clamp three-level topologies type,
T-shaped diode clamp three-level topology type or split capacitor formula three-level topology type.The three-phase and four-line of different circuit structures is matched somebody with somebody
In power network compensation equipment, the method for calculating DC capacitor is also slightly different.
For the three-phase and four-line power distribution network compensation equipment of I type diode clamp three-level topology structures, inspection can be passed through
Survey three-phase and four-line power distribution network three-phase input current, you can calculate zero sequence compensation current amplitude, then by detecting that three-phase and four-line is matched somebody with somebody
Power network compensation equipment both end voltage, you can estimate three-phase and four-line power distribution network compensation equipment direct current capacitance.
For the three-phase and four-line power distribution network compensation equipment of T-shaped diode clamp three-level topology structure, direct current is calculated
The method of electric capacity is similar with the three-phase and four-line power distribution network compensation equipment of I type diode clamp three-level topology structures.
For the three-phase and four-line power distribution network compensation equipment of split capacitor formula three-level topology structure, when three-phase and four-line is matched somebody with somebody
During operation of power networks, input zero sequence fundamental current is equal with the zero sequence fundamental current for flowing through DC capacitor, therefore, direct current capacitance
Computational methods and I types diode clamp three-level topology structure and T-shaped diode clamp three-level topology structure are different, but
Based on principle it is identical, be all when flowing through DC capacitor by fundamental current produce fundamental voltage fluctuation calculated.
Specifically, when the circuit structure type that three-phase and four-line power distribution network compensates equipment is that the level of I types diode clamp three is opened up
Type is flutterred, or during T-shaped diode clamp three-level topology type, flows through the electricity of three-phase and four-line power distribution network compensation equipment positive pole and negative pole
Capacitance current fundamental voltage amplitude, is 0.95Iz_mag·maLeft and right, the value is that inventor is drawn by emulation and theory analysis, wherein
maFor control system modulation ratio.
According to circuit theory, when both positive and negative polarity direct current capacitance is C, positive pole and negative DC electric capacity can produce amplitude and be
Δ U fundamental voltage fluctuation, fluctuation size is shown below：
Wherein ω=314, are fundamental wave angular frequency.Because both positive and negative polarity voltage pulsation amplitude is of substantially equal and opposite in phase, then
The DC voltage deviation fundamental voltage amplitude that must can be detected：
So as to which the DC capacitor that can calculate calculating three-phase and four-line power distribution network compensation equipment is：
Therefore, according to zero sequence compensation current amplitude and DC voltage deviation fundamental voltage amplitude, calculate three-phase and four-line power distribution network and mend
The DC capacitor of equipment is repaid, including：
If the circuit structure type of three-phase and four-line power distribution network compensation equipment is diode clamp three-level topology type, according to
The DC capacitor that three-phase and four-line power distribution network compensates equipment is calculated, wherein, C is three-phase and four-line power distribution network compensation equipment
DC capacitor, Iz_magIt is zero sequence compensation current amplitude, Uerr_magIt is DC voltage deviation fundamental voltage amplitude, maIt is control system modulation
Than ω is fundamental wave angular frequency.
When the circuit structure type that three-phase and four-line power distribution network compensates equipment is split capacitor formula three-level topology type, flow through
It is 3I that three-phase and four-line power distribution network, which compensates equipment positive pole and negative pole capacitance current fundamental voltage amplitude,z_mag/ 2, similarly, three can be calculated
The line power distribution network of phase four compensates the DC capacitor of equipment
Therefore, according to zero sequence compensation current amplitude and DC voltage deviation fundamental voltage amplitude, calculate three-phase and four-line power distribution network and mend
The DC capacitor of equipment is repaid, including：
If the circuit structure type of three-phase and four-line power distribution network compensation equipment is split capacitor formula three-level topology type, according to
The DC capacitor that three-phase and four-line power distribution network compensates equipment is calculated, wherein, C is three-phase and four-line power distribution network compensation equipment
DC capacitor, Iz_magIt is zero sequence compensation current amplitude, Uerr_magIt is DC voltage deviation fundamental voltage amplitude, ω is fundamental wave angular frequency.
A kind of three-phase and four-line power distribution network provided from the embodiment of the present application compensates equipment DC capacitor detection method, should
The three-phase that method compensates equipment by obtaining three-phase and four-line power distribution network compensates current instantaneous value, and both positive and negative polarity DC voltage is instantaneous
Value；Current instantaneous value is compensated according to three-phase, zero sequence compensation current amplitude is calculated；According to both positive and negative polarity DC voltage instantaneous value, calculate
DC voltage deviation fundamental voltage amplitude；According to zero sequence compensation current amplitude and DC voltage deviation fundamental voltage amplitude, three-phase and four-line is calculated
Power distribution network compensates the DC capacitor of equipment；Parameter needed for this method compensates the three-phase compensation electricity of equipment for three-phase and four-line power distribution network
Instantaneous value, and both positive and negative polarity DC voltage instantaneous value are flowed, these parameters are that three-phase and four-line power distribution network must be detected when normally running
Parameter, without increasing other detections and test equipment, therefore extra cost will not be increased.
This method is calculated merely with the zero-sequence component and DC voltage detection value in compensation electric current, it is not necessary to stop three
The compensation equipment operation of the line power distribution network of phase four, need not more increase other extra output components, therefore not interfere with three-phase and four-line and match somebody with somebody
Power network is normally run and compensation effect.
In addition, this method is by algorithm to monitor direct current during three-phase and four-line power distribution network compensation equipment normally operation
Capacitance, rather than direct current capacitance is monitored in the moment that three-phase and four-line power distribution network compensation equipment is started or stoped, because
This can carry out continuation monitoring to direct current capacitance.
As shown in figure 5, the embodiment of the present application also provides a kind of three-phase and four-line power distribution network compensation equipment DC capacitor detection dress
400 are put, device 400 is used for the three-phase and four-line power distribution network compensation equipment DC capacitor detection side for performing the embodiment of the present application offer
Method, device 400 includes：
Acquiring unit 401, the three-phase for obtaining three-phase and four-line power distribution network compensation equipment compensates current instantaneous value, Yi Jizheng
Negative DC instantaneous voltage.
First computing unit 402, for compensating current instantaneous value according to three-phase, calculates zero sequence compensation current amplitude.
Second computing unit 403, for according to both positive and negative polarity DC voltage instantaneous value, calculating DC voltage deviation fundamental wave width
Value.
3rd computing unit 404, for according to zero sequence compensation current amplitude and DC voltage deviation fundamental voltage amplitude, calculating three
The line power distribution network of phase four compensates the DC capacitor of equipment.
Specifically, the first computing unit 402 includes：
First computation subunit 4021, for basis
iz=(ia+ib+ic)/3
The zero-sequence current in compensation electric current is calculated, wherein, izIt is to compensate the zero-sequence current in electric current, ia、ib、icIt is three-phase
Compensate current instantaneous value.
Second computation subunit 4022, for the zero-sequence current in compensation electric current, calculates zero sequence compensation current amplitude.
Specifically, the second computing unit 403 includes：
3rd computation subunit 4031, for basis
udc_err=udc1-udc2
Both positive and negative polarity DC voltage difference is calculated, wherein, udc_errIt is both positive and negative polarity DC voltage difference, udc1It is positive DC voltage wink
Duration, udc2It is negative DC instantaneous voltage.
4th computation subunit 4032, for according to both positive and negative polarity DC voltage difference, calculating DC voltage deviation fundamental voltage amplitude.
Specifically, the 3rd computing unit 404 is used for：
If the circuit structure type of three-phase and four-line power distribution network compensation equipment is diode clamp three-level topology type, according to
The DC capacitor that three-phase and four-line power distribution network compensates equipment is calculated, wherein, C is three-phase and four-line power distribution network compensation equipment
DC capacitor, Iz_magIt is zero sequence compensation current amplitude, Uerr_magIt is DC voltage deviation fundamental voltage amplitude, maIt is control system modulation
Than ω is fundamental wave angular frequency.
If the circuit structure type of three-phase and four-line power distribution network compensation equipment is split capacitor formula three-level topology type, according to
The DC capacitor that three-phase and four-line power distribution network compensates equipment is calculated, wherein, C is three-phase and four-line power distribution network compensation equipment
DC capacitor, Iz_magIt is zero sequence compensation current amplitude, Uerr_magIt is DC voltage deviation fundamental voltage amplitude, ω is fundamental wave angular frequency.
A kind of three-phase and four-line power distribution network provided from the embodiment of the present application compensates equipment DC capacitor detection means, should
The three-phase that device compensates equipment by obtaining three-phase and four-line power distribution network compensates current instantaneous value, and both positive and negative polarity DC voltage is instantaneous
Value；Current instantaneous value is compensated according to three-phase, zero sequence compensation current amplitude is calculated；According to both positive and negative polarity DC voltage instantaneous value, calculate
DC voltage deviation fundamental voltage amplitude；According to zero sequence compensation current amplitude and DC voltage deviation fundamental voltage amplitude, three-phase and four-line is calculated
Power distribution network compensates the DC capacitor of equipment；Parameter needed for the device compensates the three-phase compensation electricity of equipment for three-phase and four-line power distribution network
Instantaneous value, and both positive and negative polarity DC voltage instantaneous value are flowed, these parameters are that three-phase and four-line power distribution network must be detected when normally running
Parameter, without increasing other detections and test equipment, therefore extra cost will not be increased.
The device is calculated merely with the zero-sequence component and DC voltage detection value in compensation electric current, it is not necessary to stop three
The compensation equipment operation of the line power distribution network of phase four, need not more increase other extra output components, therefore not interfere with three-phase and four-line and match somebody with somebody
Power network is normally run and compensation effect.
In addition, the device is by algorithm to monitor direct current during three-phase and four-line power distribution network compensation equipment normally operation
Capacitance, rather than direct current capacitance is monitored in the moment that three-phase and four-line power distribution network compensation equipment is started or stoped, because
This can carry out continuation monitoring to direct current capacitance.
As shown in fig. 6, the embodiment of the present application also provides a kind of three-phase and four-line power distribution network compensation equipment DC capacitor detection system
System, the system includes：Processor 400, the three-phase current detection device 200 being connected with processor 400, and be connected with processor
400 both positive and negative polarity DC voltage detector 300.
The access three-phase and four-line of three-phase current detection device 200 power distribution network 500, three-phase and four-line power distribution network compensation equipment 100 is in parallel
On three-phase and four-line power distribution network 500, both positive and negative polarity DC voltage detector 300 is connected to three-phase and four-line power distribution network compensation equipment 100
Between both positive and negative polarity.
Wherein, three-phase current detection device 200, for detecting that the three-phase of three-phase and four-line power distribution network compensation equipment compensates electric current wink
Duration.
Both positive and negative polarity DC voltage detector 300, for detecting that three-phase and four-line power distribution network compensates the both positive and negative polarity direct current of equipment
Press instantaneous value.
Processor 400, including：
Acquiring unit 401, for by three-phase current detection device 200, obtaining three-phase and four-line power distribution network compensation equipment 100
Three-phase compensates current instantaneous value, by both positive and negative polarity DC voltage detector 300, obtains three-phase and four-line power distribution network compensation equipment 100
Both positive and negative polarity DC voltage instantaneous value.
First computing unit 402, for compensating current instantaneous value according to three-phase, calculates zero sequence compensation current amplitude.
Second computing unit 403, for according to both positive and negative polarity DC voltage instantaneous value, calculating DC voltage deviation fundamental wave width
Value.
3rd computing unit 404, for according to zero sequence compensation current amplitude and DC voltage deviation fundamental voltage amplitude, calculating three
The line power distribution network of phase four compensates the DC capacitor of equipment 100.
A kind of three-phase and four-line power distribution network provided from the embodiment of the present application compensates equipment DC capacitor detecting system, should
System includes：Processor, the three-phase current detection device being connected with processor, and the both positive and negative polarity DC voltage being connected with processor
Detector, by three-phase current detection device, can obtain the three-phase compensation current instantaneous value of three-phase and four-line power distribution network compensation equipment, borrow
Both positive and negative polarity DC voltage detector is helped, the both positive and negative polarity DC voltage instantaneous value that three-phase and four-line power distribution network compensates equipment is obtained.According to
Three-phase compensates current instantaneous value, calculates zero sequence compensation current amplitude.According to both positive and negative polarity DC voltage instantaneous value, DC voltage is calculated
Deviation fundamental voltage amplitude.According to zero sequence compensation current amplitude and DC voltage deviation fundamental voltage amplitude, calculate three-phase and four-line power distribution network and mend
Repay the DC capacitor of equipment.The parameter that the system is detected is that the three-phase compensation electric current of three-phase and four-line power distribution network compensation equipment is instantaneous
Value, and both positive and negative polarity DC voltage instantaneous value, these parameters are the parameters that must be detected when three-phase and four-line power distribution network is normally run,
Without increasing other detections and test equipment, therefore extra cost will not be increased.
The system is calculated merely with the zero-sequence component and DC voltage detection value in compensation electric current, it is not necessary to stop three
The compensation equipment operation of the line power distribution network of phase four, need not more increase other extra output components, therefore not interfere with three-phase and four-line and match somebody with somebody
Power network is normally run and compensation effect.
In addition, the system is by algorithm to monitor direct current during three-phase and four-line power distribution network compensation equipment normally operation
Capacitance, rather than direct current capacitance is monitored in the moment that three-phase and four-line power distribution network compensation equipment is started or stoped, because
This can carry out continuation monitoring to direct current capacitance.
In the specific implementation, the application also provides a kind of computer-readable storage medium, wherein, the computer-readable storage medium can be stored
There is program, the program may include the three-phase and four-line power distribution network compensation equipment DC capacitor detection method that the present invention is provided when performing
Part or all of step in each embodiment.Described storage medium can be magnetic disc, CD, read-only memory (English：
Read-only memory, referred to as：ROM) or random access memory (English：Random access memory, referred to as：
RAM) etc..
It is required that those skilled in the art can be understood that the technology in the embodiment of the present invention can add by software
The mode of general hardware platform realize.Understood based on such, the technical scheme in the embodiment of the present invention substantially or
Say that the part contributed to prior art can be embodied in the form of software product, the computer software product can be deposited
Storage is in storage medium, such as ROM/RAM, magnetic disc, CD, including some instructions are to cause a computer equipment (can be with
It is personal computer, server, or network equipment etc.) perform some part institutes of each of the invention embodiment or embodiment
State.
Between the embodiment of each in this specification identical similar part mutually referring to.Especially for three-phase and four-line
For power distribution network compensation equipment DC capacitor detection means embodiment, because it is substantially similar to embodiment, so the ratio of description
Relatively simple, related part is referring to the explanation in embodiment.
Above-described the application embodiment does not constitute the restriction to the application protection domain.
Claims (9)
1. a kind of three-phase and four-line power distribution network compensates equipment DC capacitor detection method, it is characterised in that methods described includes as follows
Step：
Obtain the three-phase compensation current instantaneous value of three-phase and four-line power distribution network compensation equipment, and both positive and negative polarity DC voltage instantaneous value；
Current instantaneous value is compensated according to the three-phase, zero sequence compensation current amplitude is calculated；
According to the both positive and negative polarity DC voltage instantaneous value, DC voltage deviation fundamental voltage amplitude is calculated；
According to the zero sequence compensation current amplitude and the DC voltage deviation fundamental voltage amplitude, the three-phase and four-line power distribution network is calculated
Compensate the DC capacitor of equipment.
2. the method as described in claim 1, it is characterised in that compensate current instantaneous value according to the three-phase, calculates zero sequence and mends
Current amplitude is repaid, including：
According to
iz=(ia+ib+ic)/3
The zero-sequence current in compensation electric current is calculated, wherein, izIt is to compensate the zero-sequence current in electric current, ia、ib、icIt is three-phase compensation electricity
Flow instantaneous value；
According to the zero-sequence current in the compensation electric current, the zero sequence compensation current amplitude is calculated.
3. the method as described in claim 1, it is characterised in that according to the both positive and negative polarity DC voltage instantaneous value, calculates direct current
Voltage deviation fundamental voltage amplitude, including：
According to
udc_err=udc1-udc2
Both positive and negative polarity DC voltage difference is calculated, wherein, udc_errIt is both positive and negative polarity DC voltage difference, udc1It is positive DC voltage transient
Value, udc2It is negative DC instantaneous voltage；
According to the both positive and negative polarity DC voltage difference, the DC voltage deviation fundamental voltage amplitude is calculated.
4. the method as described in claim 1, it is characterised in that according to the zero sequence compensation current amplitude and the DC voltage
Deviation fundamental voltage amplitude, calculates the DC capacitor that the three-phase and four-line power distribution network compensates equipment, including：
If the circuit structure type of the three-phase and four-line power distribution network compensation equipment is diode clamp three-level topology type, according to
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The DC capacitor that the three-phase and four-line power distribution network compensates equipment is calculated, wherein, C is three-phase and four-line power distribution network compensation equipment
DC capacitor, Iz_magIt is zero sequence compensation current amplitude, Uerr_magIt is DC voltage deviation fundamental voltage amplitude, maIt is control system modulation
Than ω is fundamental wave angular frequency；
If the circuit structure type of the three-phase and four-line power distribution network compensation equipment is split capacitor formula three-level topology type, according to
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The DC capacitor that the three-phase and four-line power distribution network compensates equipment is calculated, wherein, C is three-phase and four-line power distribution network compensation equipment
DC capacitor, Iz_magIt is zero sequence compensation current amplitude, Uerr_magIt is DC voltage deviation fundamental voltage amplitude, ω is fundamental wave angular frequency.
5. a kind of three-phase and four-line power distribution network compensates equipment DC capacitor detection means, it is characterised in that described device includes：
Acquiring unit, the three-phase compensation current instantaneous value for obtaining three-phase and four-line power distribution network compensation equipment, and both positive and negative polarity are straight
Flow instantaneous voltage；
First computing unit, for compensating current instantaneous value according to the three-phase, calculates zero sequence compensation current amplitude；
Second computing unit, for according to the both positive and negative polarity DC voltage instantaneous value, calculating DC voltage deviation fundamental voltage amplitude；
3rd computing unit, for according to the zero sequence compensation current amplitude and the DC voltage deviation fundamental voltage amplitude, calculating
The three-phase and four-line power distribution network compensates the DC capacitor of equipment.
6. device as claimed in claim 5, it is characterised in that first computing unit includes：
First computation subunit, for basis
iz=(ia+ib+ic)/3
The zero-sequence current in compensation electric current is calculated, wherein, izIt is to compensate the zero-sequence current in electric current, ia、ib、icIt is three-phase compensation electricity
Flow instantaneous value；
Second computation subunit, for the zero-sequence current in the compensation electric current, calculates the zero sequence compensation current amplitude.
7. device as claimed in claim 5, it is characterised in that second computing unit includes：
3rd computation subunit, for basis
udc_err=udc1-udc2
Both positive and negative polarity DC voltage difference is calculated, wherein, udc_errIt is both positive and negative polarity DC voltage difference, udc1It is positive DC voltage transient
Value, udc2It is negative DC instantaneous voltage；
4th computation subunit, for according to the both positive and negative polarity DC voltage difference, calculating the DC voltage deviation fundamental voltage amplitude.
8. device as claimed in claim 5, it is characterised in that the 3rd computing unit is used for：
If the circuit structure type of the three-phase and four-line power distribution network compensation equipment is diode clamp three-level topology type, according to
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The DC capacitor that the three-phase and four-line power distribution network compensates equipment is calculated, wherein, C is three-phase and four-line power distribution network compensation equipment
DC capacitor, Iz_magIt is zero sequence compensation current amplitude, Uerr_magIt is DC voltage deviation fundamental voltage amplitude, maIt is control system modulation
Than ω is fundamental wave angular frequency；
If the circuit structure type of the three-phase and four-line power distribution network compensation equipment is split capacitor formula three-level topology type, according to
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The DC capacitor that the three-phase and four-line power distribution network compensates equipment is calculated, wherein, C is three-phase and four-line power distribution network compensation equipment
DC capacitor, Iz_magIt is zero sequence compensation current amplitude, Uerr_magIt is DC voltage deviation fundamental voltage amplitude, ω is fundamental wave angular frequency.
9. a kind of three-phase and four-line power distribution network compensates equipment DC capacitor detecting system, it is characterised in that the system includes：Processing
Device, the three-phase current detection device being connected with the processor, and the both positive and negative polarity DC voltage detection being connected with the processor
Device；
The three-phase current detection device, for detecting that the three-phase of three-phase and four-line power distribution network compensation equipment compensates current instantaneous value；
The both positive and negative polarity DC voltage detector, for detecting that three-phase and four-line power distribution network compensates the both positive and negative polarity DC voltage wink of equipment
Duration；
The processor, including：
Acquiring unit, for by the three-phase current detection device, obtaining the three-phase compensation of three-phase and four-line power distribution network compensation equipment
Current instantaneous value, by the both positive and negative polarity DC voltage detector, the both positive and negative polarity for obtaining three-phase and four-line power distribution network compensation equipment is straight
Flow instantaneous voltage；
First computing unit, for compensating current instantaneous value according to the three-phase, calculates zero sequence compensation current amplitude；
Second computing unit, for according to the both positive and negative polarity DC voltage instantaneous value, calculating DC voltage deviation fundamental voltage amplitude；
3rd computing unit, for according to the zero sequence compensation current amplitude and the DC voltage deviation fundamental voltage amplitude, calculating
The three-phase and four-line power distribution network compensates the DC capacitor of equipment.
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| CN201710384912.7A CN107147138B (en) | 2017-05-26 | 2017-05-26 | Three-phase and four-line power distribution network compensates equipment DC capacitor detection method, apparatus and system |
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| CN201710384912.7A CN107147138B (en) | 2017-05-26 | 2017-05-26 | Three-phase and four-line power distribution network compensates equipment DC capacitor detection method, apparatus and system |
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| CN108982960A (en) * | 2018-08-13 | 2018-12-11 | 西安科技大学 | A kind of capacitance current of distribution network measurement method and device |
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