CN103941103B - The measurement apparatus of reactor inductance amount and method in Active Power Filter-APF - Google Patents
The measurement apparatus of reactor inductance amount and method in Active Power Filter-APF Download PDFInfo
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Abstract
The present invention provides measurement apparatus and the method for reactor inductance amount in a kind of Active Power Filter-APF, device includes: the input of pressure regulator connects power supply, the input of the outfan connection transformer of pressure regulator, the outfan of transformator connects the input of commutator, the first electric capacity and be parallel to positive output end and the negative output terminal of commutator after the second capacitances in series；The outfan of commutator connects the input of inverter；Pressure regulator realizes the linearly adjustable of supply voltage；The voltage that pressure regulator exports is boosted by transformator；The ac voltage rectifier that transformator is exported by commutator is DC voltage；DC voltage inversion is that alternating voltage exports by inverter；The two ends of tested reactor connect inverter positive output end and negative output terminal respectively；The actual operating frequency that frequency is tested reactor of the pulse voltage of inverter output.High-frequency electrical sensibility reciprocal can be surveyed, rated power can be loaded into, can superposition DC component.
Description
Technical field
The present invention relates to electric and electronic technical field, particularly to the measurement apparatus of reactor inductance amount in a kind of Active Power Filter-APF and method.
Background technology
Active Power Filter-APF (APF, ActivePowerFilter) be a kind of can dynamic harmonic wave and carry out the power electronic equipment of reactive-load compensation.
It is the schematic diagram of APF of the prior art referring to Fig. 1 a, this figure.
Wherein, APF is equivalent to a controllable current source, in parallel with electrical network.
Wherein, UdcFor DC source, APF, by detecting the harmonic current of network load, produces equal in magnitude with the harmonic current of load, and electric current in opposite direction injects electrical network, thus the electric current realizing grid side is sine wave.Specifically by controlling the on off state of Q1 and Q2 in Fig. 1 a, make APF to electrical network injection current.The pwm pulse signal of the on off state controlling Q1 and Q2 determines according to the harmonic current of the load of detection.
APF often also can design a LC series resonance branch road and filter the electric current of switching frequency specially, be another schematic diagram of APF in prior art referring to Fig. 1 b, this figure.
3rd inductance L3 and electric capacity C forms series resonance branch road.Such as, the switching frequency of APF is 10kHz, namely sets the resonant frequency of L3 and C as 10kHz, absorbs the electric current of the APF switching frequency produced.If L3 and C error are relatively big, then can off-resonance frequency, it does not have Absorption will cause that APF launches excessive high-frequency harmonic electric current to electrical network.
The equivalent operation schematic diagram of Fig. 1 a and Fig. 1 b is as shown in Figure 2.
Reactor L is L1 and the L2 series connection in Fig. 1 a, and L left end is the sine voltage of electrical network, and right-hand member is pwm pulse signal.The controlled in real time of reactor current can be realized by controlling the voltage of pwm pulse signal by formula (1).
Wherein, uPWMVoltage for pwm pulse signal；UsFor line voltage；LLInductance value for reactor L.
APF compensation harmonic is 2-50 time, namely reactor output electric current is 50Hz-2500Hz, and APF switching frequency is about 10kHz, namely reactor also needs to the enough inductance values of maintenance to suppress high frequency electric at 10kHz, so the reactor working band in APF is very wide, need 50Hz-10000Hz, and electric current in high frequency superposition bigger flip-flop.
Therefore, in order to ensure that APF controls stablizing of system, it is necessary to reactor keeps inductance value in scope of design in the operating frequency range of 50Hz-10000Hz, and is still to keep enough inductance values when there being DC stacked electric current at 10000Hz.
But, the inductance value of reactor can only keep linear within the specific limits, because the change of D.C. magnetic field intensity, frequency, current amplitude (magnetic flux density) all can make the inductive of reactor change.Therefore, the inductance value of reactor in APF is measured significant for this area.
At present, the measurement of the inductance value of reactor is mainly power frequency voltammetry.
Fig. 3 is the schematic diagram utilizing power frequency voltammetry to measure reactor inductance amount in prior art.
Fixed frequency is mains frequency 50Hz, by being gradually increased electric current, it is possible to record magnitude of voltage and the current value of several point；Pressure regulator can regulate required voltage, and magnitude of voltage is obtained by voltmeter V, and current value is obtained by ammeter A；The inductance value curve with curent change can be obtained by formula (2).
But, existing power current in the reactor real work of application in the power electronic equipments such as APF, there is again high frequency electric, the test of power frequency voltammetry can not record the inductance value of real work and the degree of saturation of reactor, someone passes through to increase electric current to 2 times-3 times rated current equivalence high-frequency electrical sensibility reciprocal, it is clear that this approximate evaluation is irrational.
Prior art also has another kind of method (China application number CN103312188) by simulating the working environment of APF, after installing reactor additional, whether the actual motion condition test reactor according to APF can meet requirement, although this mode can assess reactor according to final operational effect, but cannot accurately measure the inductance value of reactor, reactor cannot do quantitative optimization design, and namely the parameter of reactor is easy crosses design.
Therefore, those skilled in the art need to provide the measurement apparatus of reactor inductance amount in the power electronic equipments such as a kind of APF, it is possible to accurately measure the inductance value of reactor at high frequency with when having a DC component superposition.
Summary of the invention
The technical problem to be solved in the present invention is to provide measurement apparatus and the method for reactor inductance amount in a kind of Active Power Filter-APF, it is possible at high frequency with accurately measure the inductance value of reactor in APF when having DC stacked.
The embodiment of the present invention provides the measurement apparatus of reactor inductance amount in a kind of Active Power Filter-APF, including: pressure regulator, transformator, commutator, inverter, the first electric capacity and the second electric capacity；
The input of described pressure regulator connects power supply, the outfan of described pressure regulator connects the input of described transformator, the outfan of described transformator connects the input of described commutator, is parallel to positive output end and the negative output terminal of described commutator after described first electric capacity and the second capacitances in series；The outfan of described commutator connects the input of described inverter；
Described pressure regulator, for realizing the linearly adjustable of supply voltage；
Described transformator, for boosting the voltage that described pressure regulator exports；
Described commutator, is DC voltage for the ac voltage rectifier exported by described transformator；
Described inverter, being used for described DC voltage inversion is that alternating voltage exports；The two ends of tested reactor connect positive output end and the negative output terminal of described inverter respectively；
In described inverter, the operative duty cycles of all IGBT pipes is 50%, the actual operating frequency that frequency is described tested reactor of the pulse voltage of described inverter output.
Preferably, also include oscillograph, for measuring the instantaneous voltage at described tested reactor two ends and the current instantaneous value of described reactor place branch road, utilize below equation to obtain the inductance value of reactor:
Wherein, iLFor described current instantaneous value, uLFor described instantaneous voltage, LLInductance value for described tested reactor.
Preferably, described pressure regulator, transformator, commutator and inverter are single-phase；
Or,
Described pressure regulator, transformator, commutator and inverter are three-phase.
The embodiment of the present invention also provides for a kind of method measuring reactor inductance amount based on described measurement apparatus, comprises the following steps:
Controlling pressure regulator makes supply voltage linearly adjustable；
The voltage that described pressure regulator exports is boosted by transformator；
The voltage commutation that described transformator is exported by commutator is DC voltage；
The DC voltage inversion that described commutator is exported by inverter is alternating voltage；
The two ends of tested reactor are connected respectively positive output end and the negative output terminal of described inverter；
Controlling the operative duty cycles of all IGBT pipes in described inverter is 50%, the actual operating frequency that frequency is described tested reactor of the pulse voltage of described inverter output.
Preferably, further comprising the steps of:
The instantaneous voltage at reactor two ends described in oscilloscope measurement and the current instantaneous value of described tested reactor place branch road is utilized to utilize below equation to obtain the inductance value of reactor:
Wherein, iLFor described current instantaneous value, uLFor described instantaneous voltage, LLInductance value for described tested reactor.
The embodiment of the present invention also provides for the measurement apparatus of reactor inductance amount in a kind of Active Power Filter-APF, including: pressure regulator, transformator, commutator, inverter, the first electric capacity and the second electric capacity；
The input of described pressure regulator connects power supply, the outfan of described pressure regulator connects the input of described transformator, the outfan of described transformator connects the input of described commutator, is parallel to positive output end and the negative output terminal of described commutator after described first electric capacity and the second capacitances in series；The outfan of described commutator connects the input of described inverter；
Described pressure regulator, is used for realizing supply voltage linearly adjustable；
Described transformator, for boosting the voltage that described pressure regulator exports；
Described commutator, is DC voltage for the ac voltage rectifier exported by described transformator；
Described inverter, being used for described DC voltage inversion is that alternating voltage exports；Positive output end and the negative output terminal of described inverter it is parallel to after tested reactor and the first resistant series；
In described inverter, the operative duty cycles of all IGBT pipes is d, and direct-current component when described d is worked by tested reactor determines, the actual operating frequency that frequency is described tested reactor of the pulse voltage of described inverter output.
Preferably, also include oscillograph, for measuring the instantaneous voltage at described reactor two ends and the current instantaneous value of described reactor place branch road, utilize below equation to obtain the inductance value of reactor:
Wherein, iLFor described current instantaneous value, uLFor described instantaneous voltage, LLInductance value for described reactor.
Preferably, described first resistance is adjustable resistance case, the resistance of described first resistance less than or equal to described reactor inductance value 1/10.
Preferably, described pressure regulator, transformator, commutator and inverter are single-phase；
Or,
Described pressure regulator, transformator, commutator and inverter are three-phase.
The embodiment of the present invention also provides for a kind of method measuring reactor inductance amount based on described measurement apparatus, comprises the following steps:
Controlling pressure regulator makes supply voltage linearly adjustable；
The voltage that described pressure regulator exports is boosted by transformator；
The voltage commutation that described transformator is exported by commutator is DC voltage；
The DC voltage inversion that described commutator is exported by inverter is alternating voltage；
Positive output end and the negative output terminal of described inverter will be parallel to after reactor in Active Power Filter-APF APF and the first resistant series；
Controlling the operative duty cycles of all IGBT pipes in described inverter is d, and direct-current component when described d is worked by tested reactor determines, the actual operating frequency that frequency is described tested reactor of the pulse voltage of described inverter output.
Compared with prior art, the invention have the advantages that
The measurement apparatus that this example provides, it is possible to by controlling inverter, make the impulse wave voltage that inverter output amplitude, frequency and dutycycle all can regulate, simulate the real work scene of tested reactor, thus measuring the inductance value of tested reactor.Because conventional test methodologies only can measure tested reactor inductance value under zero load and under power frequency, and apparatus and method provided by the invention can measure the inductance value loaded under lower and high frequency.Contrasting traditional method of testing present invention to have the advantage that: first can survey high-frequency electrical sensibility reciprocal, second can be loaded into rated power, and the 3rd can superposition DC component.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 a is the schematic diagram of APF of the prior art；
Another schematic diagram of APF in Fig. 1 b prior art；
Fig. 2 is the equivalent operation schematic diagram of Fig. 1 a and Fig. 1 b；
Fig. 3 is the schematic diagram utilizing power frequency voltammetry to measure reactor inductance amount in prior art；
Fig. 4 is measurement apparatus embodiment one schematic diagram of reactor inductance amount in APF provided by the invention；
Fig. 4 a is the measurement wiring diagram of measurement apparatus embodiment one provided by the invention；
Fig. 5 is the measurement apparatus schematic diagram of three-phase topological structure provided by the invention；
Fig. 6 a is the voltage oscillogram on reactor corresponding for Fig. 4 a provided by the invention；
Fig. 6 b is the current waveform figure on reactor corresponding for Fig. 4 a provided by the invention；
Fig. 7 is measuring method embodiment one flow chart provided by the invention；
Fig. 8 is the measurement wiring diagram of measurement apparatus embodiment two provided by the invention；；
Fig. 9 a is the voltage oscillogram on the reactor that Fig. 8 provided by the invention is corresponding；
Fig. 9 b is the current waveform figure on the reactor that Fig. 8 provided by the invention is corresponding；
Figure 10 is measuring method embodiment two flow chart provided by the invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
Understandable for enabling the above-mentioned purpose of the present invention, feature and advantage to become apparent from, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
It should be noted that the present invention provides the device and the reactor inductance value when having DC stacked of measuring the reactor inductance value when high frequency in APF, introduce separately below, first introduce the measurement apparatus of the reactor inductance value when high frequency.
Referring to measurement apparatus embodiment one schematic diagram that Fig. 4, this figure are reactor inductance amount in APF provided by the invention.
The measurement apparatus of reactor inductance amount in the APF that the present embodiment provides, including: pressure regulator 100, transformator 200, commutator 300, inverter the 400, first electric capacity C1 and the second electric capacity C2；
It should be noted that the first electric capacity C1 and the second electric capacity C2 preferably can adopt electrochemical capacitor.
First electric capacity C1 and the second electric capacity C2 realizes the effect that DC voltage supports.After C1 and C2 series connection, the voltage at two ends is Udc。
The outfan of described pressure regulator 100 connects the input of described transformator 200, the outfan of described transformator 200 connects the input of described commutator 300, is parallel to positive output end and the negative output terminal of described commutator 300 after described first electric capacity C1 and the second electric capacity C2 series connection；The outfan of described commutator 300 connects the input of described inverter 400；
Described pressure regulator 100, for realizing the linearly adjustable of supply voltage；
The input of described pressure regulator 100 connects power supply (not shown), it is necessary to explanation, and the power supply that the input of pressure regulator 100 connects is alternating current, for instance can be 380V alternating current in China.It is linearly adjustable that pressure regulator 100 can realize the alternating voltage within the scope of 0V-380V.
Described transformator 200, for boosting the voltage that described pressure regulator 100 exports；
Owing to the DC side of APF has boosting rectifier control, DC voltage is higher than general commutator (line voltage peak), so need the voltage that pressure regulator 100 is exported by transformator 200 to carry out boosting process herein.
Described commutator 300, being used for the ac voltage rectifier that described transformator 200 exports is DC voltage；
The rectifier bridge that in the present embodiment, commutator 300 is made up of four diodes realizes, as shown in Figure 4, including the first diode D1, the second diode D2, the 3rd diode D3 and the four diode D4.Wherein, D1 and D2 forms a brachium pontis, and D3 and D4 forms another brachium pontis.
The alternating voltage of inverter 400 output is u.
It is understood that commutator 300 and inverter 400 are all introduced for single-phase in the present embodiment.
Described inverter 400, being used for described DC voltage inversion is that all adjustable pulse voltage of amplitude, frequency and dutycycle exports；The two ends of tested reactor connect positive output end and the negative output terminal of described inverter 400 respectively；
As shown in fig. 4 a, L is tested reactor.M3 and M4 is connected with M1 and M2 respectively, is connected to positive output end and the negative output terminal of inverter 400 by L.
It should be noted that the tested reactor in the embodiment of the present invention can be the inducer in APF, it is also possible to for the reactor in other workplaces.Following example are introduced for the inducer in APF.
It is understood that measuring tested reactor measurement apparatus of inductance value when high frequency is Fig. 4 and Fig. 4 a measurement apparatus formed together.
It should be noted that wherein A is the outfan being connected on inverter 400, A represents measurement electric current, and V is connected in parallel on the two ends of tested reactor L, and V represents measurement voltage.
Inverter 400 includes four IGBT pipe, as shown in Figure 4, respectively an IGBT pipe T1, the 2nd IGBT pipe T2, the 3rd IGBT pipe T3 and the four IGBT pipe T4.Wherein, T1 and T2 forms a brachium pontis, and T3 and T4 forms another brachium pontis.
In described inverter 400, the operative duty cycles of all IGBT pipes is 50%, the actual operating frequency that frequency is the tested reactor in APF of the pulse voltage of described inverter 400 output.Such as, the actual operating frequency of tested reactor is 10kHz, then adjustment inverter 400 makes the frequency of its pulse voltage exported be 10kHz.
Why arranging all IGBT in the present embodiment, to manage the operative duty cycles of (T1-T4) be 50%, is because dutycycle when being 50%, inverter 400 output there is no DC component, be entirely alternating voltage.So can measure reactor inductance value in high frequency.
The measurement apparatus that the present embodiment provides, can pass through to control inverter, making voltage that inverter exports and frequency is tested reactor practical working situation in APF, and the dutycycle of each IGBT pipe work is 50% in inverter, tested reactor so can be made to work at high frequencies, and there is no DC component.Because now the test frequency of tested reactor, voltage, electric current are real work situation, measure the inductance value under this situation more accurate.
It should be noted that the topology shown in Fig. 4 is single-phase topology, it is to be understood that measurement apparatus provided by the invention can also be three-phase topological structure, as it is shown in figure 5, the measurement apparatus schematic diagram that this figure is three-phase topological structure provided by the invention.
It should be noted that pressure regulator 100a in Fig. 5, transformator 200a, commutator 300a, inverter 400a are all three-phases, certainly, tested reactor is also three-phase, the LA in Fig. 5, LB and LC.
The following describes the operation principle of the measurement apparatus that the embodiment of the present invention provides.
A and V can be obtained by oscillograph.
Namely also include oscillograph, for measuring the instantaneous voltage at described reactor two ends and the current instantaneous value of described reactor place branch road, utilize below equation to obtain the inductance value of reactor:
Wherein, iLFor described current instantaneous value, uLFor described instantaneous voltage, LLInductance value for described tested reactor.
It should be noted that iLAnd uLIt is instantaneous value, is an amount with time correlation.
Formula (3) can be passed through and complete the measurement of tested reactor inductance amount.
Voltage and current on tested reactor L is respectively referring to Fig. 6 a and Fig. 6 b.
It can be seen that voltage u from Fig. 6 aLFor square wave, electric current iLFor triangular wave.
Utilize Fig. 6 a and Fig. 6 b can calculate the inductance value L of tested reactor.
Based on the measurement apparatus of reactor inductance amount in a kind of APF that above example provides, present invention also offers a kind of based on the method for reactor inductance amount in the measurement APF of described measurement apparatus.It is described in detail below in conjunction with accompanying drawing.
Embodiment of the method one:
It is provided by the invention based on embodiment of the method one flow chart of reactor inductance amount in the measurement APF of measurement apparatus referring to Fig. 7, this figure.
Firstly, it is necessary to illustrate, the method that the present embodiment provides is used for measuring the tested reactor inductance value when high frequency based on the measurement apparatus of Fig. 4 and Fig. 4 a.
The method measuring reactor inductance amount based on measurement apparatus that the present embodiment provides, it is characterised in that comprise the following steps:
S701: control pressure regulator and make supply voltage linearly adjustable；
S702: the voltage that described pressure regulator exports is boosted by transformator；
S703: the voltage commutation that described transformator is exported by commutator is DC voltage；
S704: the DC voltage inversion that described commutator is exported by inverter is all adjustable pulse voltage of amplitude, frequency and dutycycle；
S705: the two ends of tested reactor are connected respectively positive output end and the negative output terminal of described inverter；
S706: controlling the operative duty cycles of all IGBT pipes in described inverter is 50%, the actual operating frequency that frequency is described tested reactor of the pulse voltage of described inverter output.
It should be noted that arrange all IGBT in the present embodiment, to manage the operative duty cycles of (T1-T4) be 50%, is because dutycycle when being 50%, inverter 400 output there is no DC component, be entirely alternating voltage.So can measure reactor inductance value in high frequency.
The measurement apparatus that the present embodiment provides, can pass through to control inverter, making voltage that inverter exports and frequency is reactor practical working situation in APF, and the dutycycle of each IGBT pipe work is 50% in inverter, reactor so can be made to work at high frequencies, and there is no DC component.Because now the working environment of tested reactor has been the working environment in APF, measure the inductance value under this situation more accurate.
It should be noted that described method is further comprising the steps of:
Utilize the instantaneous voltage at reactor two ends described in oscilloscope measurement and the current instantaneous value of described tested reactor place branch road, utilize below equation to obtain the inductance value of tested reactor:
Wherein, iLFor described current instantaneous value, uLFor described instantaneous voltage, LLInductance value for described tested reactor.
It should be noted that iLAnd uLIt is instantaneous value, is an amount with time correlation.
Formula (3) can be passed through and complete the measurement of tested reactor inductance amount.
Voltage and current on tested reactor L is respectively referring to Fig. 6 a and Fig. 6 b.
It can be seen that voltage u from Fig. 6 aLFor square wave, electric current iLFor triangular wave.
Utilize Fig. 6 a and Fig. 6 b can calculate the inductance value L of tested reactorL。
Above example introduction is measurement apparatus and the measuring method of reactor inductance value when high frequency in APF, be described below in APF reactor have DC stacked under time the measurement apparatus of inductance value and measuring method.
Device embodiment two:
Referring to the measurement wiring diagram that Fig. 8, this figure are measurement apparatus embodiment two provided by the invention.
It should be noted that DC stacked time measurement apparatus and the high frequency of inductance value of tested reactor time the main topological structure of measurement apparatus be identical, referring to Fig. 4.
The measurement apparatus of reactor inductance amount in the Active Power Filter-APF that the present embodiment provides, including: pressure regulator 100, transformator 200, commutator 300, inverter the 400, first electric capacity C1 and the second electric capacity C2；
The input of described pressure regulator 100 connects power supply, the outfan of described pressure regulator 100 connects the input of described transformator 200, the outfan of described transformator 200 connects the input of described commutator 300, is parallel to positive output end and the negative output terminal of described commutator 300 after described first electric capacity C1 and the second electric capacity C2 series connection；The outfan of described commutator 300 connects the input of described inverter 400；
Described pressure regulator 100, is used for realizing supply voltage linearly adjustable；
Described transformator 200, for boosting the voltage that described pressure regulator 100 exports；
Described commutator 300, being used for the ac voltage rectifier that described transformator 200 exports is DC voltage；
Described inverter 400, being used for described DC voltage inversion is that all adjustable pulse voltage of amplitude, frequency and dutycycle exports；Positive output end and the negative output terminal of described inverter 400 it is parallel to after tested reactor and the first resistance R1 series connection.
As shown in Figure 8.M5 and M6 is attached with M1 and M2 respectively.
In described inverter 400, the operative duty cycles of all IGBT pipes is d, and direct-current component when described d is worked by tested reactor determines, the actual operating frequency that frequency is tested reactor of the pulse voltage of described inverter 400 output.
It is understood that when there being direct-current component, d is more than 50%.
It should be noted that, in the embodiment of the present invention, why arrange the operative duty cycles of all IGBT pipes in inverter 400 to be because more than 50%, when dutycycle is more than 50%, the alternating current of inverter 400 output is pressed with flip-flop, so just can measure tested reactor inductance value under DC stacked.
It is understood that in order to easy to adjust in application process, described first resistance R1 can be realized by regulating resistance box.
It addition, in order to ensure that the first resistance R1 is sufficiently small to the dividing potential drop of AC compounent, it is unlikely to that impact is measured as a result, it is desirable to arrange the 1/10 of the resistance of the described first resistance R1 inductance value less than or equal to described tested reactor.
The alternating current i of inverter 400 outputLIn DC component be Idc。
Idc=(2d-1) * Udc/R1(4)
The DC impedance of inductance L is 0, so DC voltage is undertaken by R1.
Wherein, electric current iLWaveform be the triangular wave of superposition in DC component.
So can obtain tested reactor inductance value when DC stacked according to formula (3).
Voltage uLWith electric current iLWaveform respectively referring to Fig. 9 a and Fig. 9 b.
It can be seen that the initial point of electric current is not 0A from current waveform, but at about 80A, the unit of electric current is A.
The measurement apparatus that the present embodiment provides, can pass through to control inverter, making voltage that inverter exports and frequency is tested reactor practical working situation in APF, and in inverter, the dutycycle of each IGBT pipe work is more than 50%, so can measure tested reactor inductance value when DC stacked.Because now the working environment of tested reactor has been the working environment in APF, measure the inductance value under this situation more accurate.
Based on the measurement apparatus of reactor inductance amount in a kind of APF that above example provides, present invention also offers a kind of based on the method for reactor inductance amount in the measurement APF of described measurement apparatus.It is described in detail below in conjunction with accompanying drawing.
Embodiment of the method two:
It is provided by the invention based on embodiment of the method two flow chart of reactor inductance amount in the measurement APF of measurement apparatus referring to Figure 10, this figure.
The method measuring reactor inductance amount based on the measurement apparatus described in Fig. 8 that the present embodiment provides, comprises the following steps:
S1001: control pressure regulator and make supply voltage linearly adjustable；
S1002: the voltage that described pressure regulator exports is boosted by transformator；
S1003: the voltage commutation that described transformator is exported by commutator is DC voltage；
S1004: the DC voltage inversion that described commutator is exported by inverter is all adjustable pulse voltage of amplitude, frequency and dutycycle；
S1005: positive output end and the negative output terminal of described inverter will be parallel to after tested reactor and the first resistant series；
S1006: controlling the operative duty cycles of all IGBT pipes in described inverter is d, direct-current component when described d is worked by tested reactor determines, the actual operating frequency that frequency is tested reactor of the pulse voltage of described inverter output.
It is understood that when there is direct-current component, d is more than 50%.
It should be noted that, why the present embodiment arranges the operative duty cycles of all IGBT pipes in inverter 400 be because more than 50%, when dutycycle is more than 50%, the alternating current of inverter 400 output is pressed with flip-flop, so just can measure tested reactor inductance value under DC stacked.
The measuring method that the present embodiment provides, can pass through to control inverter, making voltage that inverter exports and frequency is tested reactor practical working situation in APF, and in inverter, the dutycycle of each IGBT pipe work is more than 50%, so can measure tested reactor inductance value when DC stacked.Because now the test frequency of tested reactor, voltage, electric current are real work situation, measure the inductance value under this situation more accurate.
The above, be only presently preferred embodiments of the present invention, and the present invention not does any pro forma restriction.Although the present invention is disclosed above with preferred embodiment, but it is not limited to the present invention.Any those of ordinary skill in the art, without departing from, under technical solution of the present invention ambit, may utilize the method for the disclosure above and technology contents and technical solution of the present invention is made many possible variations and modification, or be revised as the Equivalent embodiments of equivalent variations.Therefore, every content without departing from technical solution of the present invention, the technical spirit of the foundation present invention, to any simple modification made for any of the above embodiments, equivalent variations and modification, all still falls within the scope of technical solution of the present invention protection.
Claims (10)
1. the measurement apparatus of reactor inductance amount in an Active Power Filter-APF, it is characterised in that including: pressure regulator, transformator, commutator, inverter, the first electric capacity and the second electric capacity；
The input of described pressure regulator connects power supply, the outfan of described pressure regulator connects the input of described transformator, the outfan of described transformator connects the input of described commutator, is parallel to positive output end and the negative output terminal of described commutator after described first electric capacity and the second capacitances in series；The outfan of described commutator connects the input of described inverter；
Described pressure regulator, for realizing the linearly adjustable of supply voltage；
Described transformator, for boosting the voltage that described pressure regulator exports；
Described commutator, is DC voltage for the ac voltage rectifier exported by described transformator；
Described inverter, being used for described DC voltage inversion is that alternating voltage exports；The two ends of tested reactor connect positive output end and the negative output terminal of described inverter respectively；
In described inverter, the operative duty cycles of all IGBT pipes is 50%, the actual operating frequency that frequency is described tested reactor of the pulse voltage of described inverter output.
2. the measurement apparatus of reactor inductance amount in Active Power Filter-APF according to claim 1, it is characterized in that, also include oscillograph, the current instantaneous value of instantaneous voltage and described reactor place branch road for measuring described tested reactor two ends, utilizes below equation to obtain the inductance value of reactor:
Wherein, iLFor described current instantaneous value, uLFor described instantaneous voltage, LLInductance value for described tested reactor.
3. the measurement apparatus of reactor inductance amount in Active Power Filter-APF according to claim 1 and 2, it is characterised in that described pressure regulator, transformator, commutator and inverter are single-phase；
Or,
Described pressure regulator, transformator, commutator and inverter are three-phase.
4. the method measuring reactor inductance amount based on the measurement apparatus described in any one of claim 1-3, it is characterised in that comprise the following steps:
Controlling pressure regulator makes supply voltage linearly adjustable；
The voltage that described pressure regulator exports is boosted by transformator；
The voltage commutation that described transformator is exported by commutator is DC voltage；
The DC voltage inversion that described commutator is exported by inverter is alternating voltage；
The two ends of tested reactor are connected respectively positive output end and the negative output terminal of described inverter；
Controlling the operative duty cycles of all IGBT pipes in described inverter is 50%, the actual operating frequency that frequency is described tested reactor of the pulse voltage of described inverter output.
5. method according to claim 4, it is characterised in that further comprising the steps of:
Utilize the instantaneous voltage at reactor two ends described in oscilloscope measurement and the current instantaneous value of described tested reactor place branch road, utilize below equation to obtain the inductance value of reactor:
Wherein, iLFor described current instantaneous value, uLFor described instantaneous voltage, LLInductance value for described tested reactor.
6. the measurement apparatus of reactor inductance amount in an Active Power Filter-APF, it is characterised in that including: pressure regulator, transformator, commutator, inverter, the first electric capacity and the second electric capacity；
The input of described pressure regulator connects power supply, the outfan of described pressure regulator connects the input of described transformator, the outfan of described transformator connects the input of described commutator, is parallel to positive output end and the negative output terminal of described commutator after described first electric capacity and the second capacitances in series；The outfan of described commutator connects the input of described inverter；
Described pressure regulator, is used for realizing supply voltage linearly adjustable；
Described transformator, for boosting the voltage that described pressure regulator exports；
Described commutator, is DC voltage for the ac voltage rectifier exported by described transformator；
Described inverter, being used for described DC voltage inversion is that alternating voltage exports；Positive output end and the negative output terminal of described inverter it is parallel to after tested reactor and the first resistant series；
In described inverter, the operative duty cycles of all IGBT pipes is d, and direct-current component when described d is worked by tested reactor determines, the actual operating frequency that frequency is described tested reactor of the pulse voltage of described inverter output.
7. the measurement apparatus of reactor inductance amount in Active Power Filter-APF according to claim 6, it is characterized in that, also include oscillograph, the current instantaneous value of instantaneous voltage and described reactor place branch road for measuring described reactor two ends, utilizes below equation to obtain the inductance value of reactor:
Wherein, iLFor described current instantaneous value, uLFor described instantaneous voltage, LLInductance value for described reactor.
8. the measurement apparatus of reactor inductance amount in the Active Power Filter-APF according to claim 6 or 7, it is characterised in that described first resistance is adjustable resistance case, the resistance of described first resistance less than or equal to described reactor inductance value 1/10.
9. the measurement apparatus of reactor inductance amount in the Active Power Filter-APF according to claim 6 or 7, it is characterised in that described pressure regulator, transformator, commutator and inverter are single-phase；
Or,
Described pressure regulator, transformator, commutator and inverter are three-phase.
10. the method measuring reactor inductance amount based on the measurement apparatus described in any one of claim 6-9, it is characterised in that comprise the following steps:
Controlling pressure regulator makes supply voltage linearly adjustable；
The voltage that described pressure regulator exports is boosted by transformator；
The voltage commutation that described transformator is exported by commutator is DC voltage；
The DC voltage inversion that described commutator is exported by inverter is alternating voltage；
Positive output end and the negative output terminal of described inverter will be parallel to after reactor in Active Power Filter-APF APF and the first resistant series；
Controlling the operative duty cycles of all IGBT pipes in described inverter is d, and direct-current component when described d is worked by tested reactor determines, the actual operating frequency that frequency is described tested reactor of the pulse voltage of described inverter output.
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| CN109387701B (en) * | 2017-08-02 | 2021-03-19 | 台达电子工业股份有限公司 | Three-phase converter and capacitance estimation method |
| CN107656129B (en) * | 2017-10-10 | 2020-07-17 | 许继电气股份有限公司 | Indirect measurement method for filter branch current |
| US10797513B1 (en) * | 2019-04-08 | 2020-10-06 | Abb Schweiz Ag | Technologies for interactive predictive control of uninterruptible power supply systems |
| CN113176457A (en) * | 2020-06-19 | 2021-07-27 | 中国南方电网有限责任公司超高压输电公司天生桥局 | Anode reactor electrical performance test system and method |
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