CN101777763B - Three-phase power equipment digital decoupling monitoring system and control method - Google Patents

Abstract

The invention relates to a three-phase power equipment digital decoupling monitoring system. The system comprises an inverting bridge, a high-frequency filtering circuit, voltage and current sampling circuits, a digital signal processor, a driving circuit and a man-machine interface and is characterized in that: a three-phase power supply is connected with the corresponding input ends of the voltage and current sampling circuits respectively and is electrically connected with the digital signal processor through an output interface; the digital signal processor is provided with another two interfaces, wherein one interface is connected with the man-machine interface, while the other one is connected with the driving circuit and then connected with the inverting bridge through the driving circuit; after the three-phase power supply is connected with the voltage and current sampling circuits, the extending ends are connected with the corresponding interface end of the high-frequency filtering circuit respectively and then form the corresponding connecting ends of large-power switch tubes S1, S2, S3, S4, S5 and S6 on the inverting bridge arm by connecting with the three output ends of the high-frequency filtering circuit; and therefore the whole three-phase power equipment monitoring system is formed.

Description

Three-phase power equipment digital decoupling monitoring system and control method

Technical field

The present invention relates to the power equipment control technology, particularly a kind of three-phase power equipment digital decoupling monitoring system and control method, belong to operation power quality of power supply product applied technical field.

Background technology

Fast development along with power electronic technology and industrial technology, expedite the emergence of out various electric devices, as frequency converter, UPS, arc furnace, welding equipment, track traffic convertor assembly, SVC, STATCOM, active electric filter device, high-power signal generator, special power supply etc., these equipment extensively or have progressively entered electric power conveying, metallurgy, iron and steel, chemical industry, the field such as civilian.These power electronic equipments, due to the difference in inherent structure and the field of use, the parameter of the existing single-frequency of its controlled parameter, also have multifrequency parameter.Modern automatic control technology, just by the regulation and control to above-mentioned numerous parameters, realizes the realization to the automation control procedure of various electric power, appliance equipment.

At present, control algolithm mainly contains: classical PID and derivative algorithm thereof, the control of stagnant ring, modern control theory are as repeated control, adaptive control, fuzzy control, sliding formwork control, dead beat control, neural network control etc.Because the modern control theory algorithm is comparatively complicated, amount of calculation is large, studies more; And classical PID and derivative algorithm thereof and stagnant ring control algolithm are simple, more easily realize, practical application is more.

In actual applications, the monitoring for the single-frequency parameter, utilize controlled volume, and stagnant ring control and PID and derivative algorithm thereof can realize controlling target.Yet, for the multi-frequency controlled device, when especially the frequency in controlled device is higher, because stagnant ring control algolithm requires the controlling unit time delay enough little, this will cause the switching device frequency too high; And single traditional PID and derivative algorithm thereof are difficult to reach the control requirement usually because of limit bandwidth.In addition, repetitive control because its steady state controling precision is high, Digital Implementation easily obtained ripe application in some field as UPS etc., but in some other field, as follow the tracks of the dynamic controlled device of frequent fluctuation and compensate while administering, will exist dynamic response slow, stability is strong not, even has a strong impact on the problems such as reliability of equipment.

Therefore because pid control algorithm is simple and reliable, how to improve classical PID and derivative algorithm is extremely important in the performance of multi-frequency controlled device.

Summary of the invention

Purpose of the present invention: be intended to propose a kind of three-phase power equipment digital decoupling monitoring system and control method.

This three-phase power equipment digital decoupling monitoring system, comprise inverter bridge 4, high-frequency filter circuit 2, electric current and voltage sample circuit 1, digital signal processor 7, drive circuit 8 and man-machine interface 6, it is characterized in that: described three phase mains accesses respectively the corresponding input of voltage, power supply sample circuit 1, and by output interface with digital signal processor 7, be electrically connected to, two other interface of this digital signal processor 7: one of them interface connects man-machine interface 6, and another interface connects drive circuit 8, also by drive circuit 8, connects inverter bridge 4; Simultaneously after described three phase mains access voltage, power supply sample circuit 1 along stretching the corresponding interface end that end accesses respectively high-frequency filter circuit 2, and connecting to form high-power switch tube S on inverter bridge 4 arms through three outputs of this high-frequency filter circuit 2 again ₁, S ₂, S ₃, S ₄, S ₅, S ₆corresponding link, form whole three-phase electric power apparatus supervisory control system thus.

Described high-frequency filter circuit 2, consist of 6 reactors and high frequency carrier ripple filtering circuit; The first reactor L wherein ₁with the 4th reactor L ₄be connected, the second reactor L ₂with the 5th reactor L ₅be connected, the 3rd reactor L ₃with the 6th reactor L ₆be connected, described the first reactor L ₁with the 4th reactor L ₄common port, the second reactor L ₂with the 5th reactor L ₅common port, the 3rd reactor L ₃with the 6th reactor L ₆common port all access high frequency carrier ripple filtering circuit 3.

Described high frequency carrier filtering circuit 3, consist of three groups of C mode filters that adopt triangle to connect, and C mode filter wherein is by capacitor C ₁～C ₆, inductor L ₇～L ₉, resistor R ₁～R ₃form three filter branch that structure is identical, three filter branch adopt triangle to connect; The upper end of three filter branch connects with the mid point of three-phase input power and inverter circuit bridge by inductor respectively.

The positive terminal of inverter bridge 4 is connected with the positive terminal of storage capacitor 5, and the negative pole end of inverter bridge 4 is connected with the negative pole end of storage capacitor 5.

Described digital signal processor 7 be take the digital signal processing circuit that digital signal processing chip is constructed as core, comprises DSP digital signal processing chip and the AD conversion chip, power supply chip, the level transferring chip that are connected with its signal.

It is that core is constructed drive circuit that described drive circuit 8 adopts 2sd315.

Described electric current and voltage sample circuit 1 comprises: for the voltage transformer that gathers line voltage, gather storage capacitor voltage the voltage Hall, gather the current transformer of load current and equipment output current, and will by voltage transformer, gather storage capacitor voltage the voltage Hall, gather the signal conditioning circuit that signal input that the current transformer of load current and equipment output current obtain consists of operational amplifier; There is again described signal conditioning circuit that collected voltage, current signal are adjusted to setting range.

The method for supervising of described three-phase power equipment digital decoupling monitoring system comprises following steps:

1) obtain line voltage, by voltage, the Current Transformer of voltage Hall acquisition storage capacitor 5, obtain load current and equipment output current with voltage transformer, nurse one's health to the setting range value, become digital quantity after the AD conversion, send into digital signal processing chip.

2) mains voltage signal obtains electric network voltage phase after software phase-lock loop 9 (SPLL), generates thus the sine and cosine reference signal sinw under each Frequency point ₁t, cosw ₁t, sinw ₂t, cosw ₂t, sinw _nt, cosw _nt.

3) Current Transformer obtains load current and equipment output current, and the two difference DELTA ia, Δ ib, Δ ic be id1, iq1, id2, iq2 and idn, the iqn after following orthogonal coordinate conversion obtains decoupling zero respectively under each frequency.

I=1,2 wherein ... n

Id1, iq1, id2, iq2 and idn, iqn obtain DC quantity idl1, iql1, idl2, iql2 and idn1, iqn2 after low-pass filtering LPF.Idl1, iql1, idl2, iql2 and idln, iqln be adjusted device output ido1, iqo1, ido2, iqo2 and idon, iqon after PI regulates, then obtains respectively ido and iqo after summation:

$\mathrm{ido}=\underset{i=\mathrm{1,2}...n}{\mathrm{\Σ}}\mathrm{idli}$

$\mathrm{iqo}=\underset{i=\mathrm{1,2},...n}{\mathrm{\Σ}}\mathrm{iqli}$

Wherein the parameter of the pi regulator under each frequency can arrange separately, optimal control.

4) ido and iqo obtain idr and iqr after interior circular current is regulated, then control drive circuit 8 work through the software space vector generator, drive the power device S in inverter bridge 4 ₁, S ₂, S ₃, S ₄, S ₅and S ₆.Finally realize the astatic control of each secondary frequencies controlled device.

The digital decoupling control method of described three-phase electric power apparatus, consist of the PI control 10 of software phase-lock loop 9 (SPLL), frequency 1, the PI control 11 of frequency 2, PI control 12, outer shroud voltage-regulation 13, the adjusting 14 of interior circular current and the space vector generator 15 of frequency i.Wherein:

Uga, ugb, ugc are electrical network A phase, B phase and C phase voltage, and ila, ilb and ilc are load current, A phase, B phase and C phase current that ifa, ifb, ifc are equipment output.The difference that Δ ia is ila and ifa, the difference that Δ ib is ilb and ifb, the difference that Δ ic is ilc and ifc.

Sinw ₁t, cosw ₁t is sine and the cosine reference signal under frequency 1.Id1, iq1 are respectively Δ ia, Δ ib, the output variable of Δ ic after coordinate transform (C321).Idl1, iql1 are respectively id1, the iq1 output variable after low pass filter (LPF).Ido1, iqo1 are respectively idl1, the iql1 output variable after PI controller (PI).

Sinw ₂t, cosw ₂t is sine and the cosine reference signal under frequency 2.Id2, iq2 are respectively Δ ia, Δ ib, the output variable of Δ ic after coordinate transform (C322).Idl2, iql2 are respectively id2, the iq2 output variable after low pass filter (LPF).Ido2, iqo2 are respectively idl2, the iql2 output variable after PI controller (PI).

Sinw _nt, cosn _nt is sine and the cosine reference signal under frequency i.Idn, iqn are respectively Δ ia, Δ ib, the output variable of Δ ic after coordinate transform (C32n).Idln, iqln are respectively idn, the iqn output variable after low pass filter (LPF).Idon, iqon are respectively idln, the iqln output variable after PI controller (PI).

The output that ido is PI controller under all frequencies (ido1, ido2 ... idon) and, the output that iqo is PI controller under all frequencies (iqo1, iqo2 ... iqon) and.

Idr, iqr are respectively ido, iqo and regulate the output after 14 through interior circular current.

The voltage that udc is storage capacitor 5.Udcr is given voltage.Idcd is the output through the outer shroud voltage-regulation of udcr and udc difference.

The three-phase power equipment digital decoupling monitoring system and the control method that according to above technical scheme, propose, not only can solve the ideal monitoring of multi-frequency controlled device, and there is dynamic response soon, can realize the stable state floating in theory, especially by adopting independent each secondary frequencies controlled device of controlling, can realize by the control parameter that each secondary frequencies is set the optimal control of each secondary frequencies controlled device.

The accompanying drawing explanation

Fig. 1 is the three-phase power equipment digital decoupling monitoring system structural representation;

Fig. 2 is for forming the high frequency carrier filtering circuit figure of C mode filter;

The fundamental block diagram that Fig. 3 is digital signal processor;

Fig. 4-1 is driving circuit structure figure;

Fig. 4-2 are passage dead band RC network figure;

Fig. 4-3 are passage output peripheral circuit diagram;

Fig. 4-4 are logic level and reseting interface figure;

Fig. 5 digital decoupling control method of the present invention schematic diagram;

Power network current waveform and current distortion rate before Fig. 6 active power filtering drops into;

Fig. 7 active filter harmonic wave control experiment schematic diagram;

Power network current waveform and current distortion rate after Fig. 8 adopts the active filter of digital decoupling control method of the present invention to drop into;

Power network current waveform and current distortion rate after Fig. 9 adopts traditional monocycle digital control method active filter to drop into;

Figure 10 active filter harmonic wave control experiment schematic diagram;

Figure 11 adopts high-power signal generator output current and the grid voltage waveform of digital decoupling control method of the present invention;

Figure 12 adopts high-power signal generator output current and the grid voltage waveform of traditional monocycle digital control method

In figure: 1-voltage, power supply sample circuit 2-high-frequency filter circuit 3-high frequency carrier ripple filtering circuit 4-inverter bridge 5-storage capacitor 6-man-machine interface 7-digital signal processor 8-drive circuit 9-software phase-lock loop

Embodiment

Further set forth the present invention below in conjunction with accompanying drawing, and provide embodiments of the invention.

This three-phase power equipment digital decoupling monitoring system, comprise inverter bridge 4, high-frequency filter circuit 2, electric current and voltage sample circuit 1, digital signal processor 7, drive circuit 8 and man-machine interface 6, it is characterized in that: described three phase mains accesses respectively the corresponding input of voltage, power supply sample circuit 1, and by output interface with digital signal processor 7, be electrically connected to, two other interface of this digital signal processor 7: one of them interface connects man-machine interface 6, and another interface connects drive circuit 8, also by drive circuit 8, connects inverter bridge 4; Simultaneously after described three phase mains access voltage, power supply sample circuit 1 along stretching the corresponding interface end that end accesses respectively high-frequency filter circuit 2, and connecting to form high-power switch tube S on inverter bridge 4 arms through three outputs of this high-frequency filter circuit 2 again ₁, S ₂, S ₃, S ₄, S ₅, S ₆corresponding link, form whole three-phase electric power apparatus supervisory control system thus.

Described high-frequency filter circuit 2, consist of 6 reactors and high frequency carrier ripple filtering circuit; The first reactor L wherein ₁with the 4th reactor L ₄be connected, the second reactor L ₂with the 5th reactor L ₅be connected, the 3rd reactor L ₃with the 6th reactor L ₆be connected, described the first reactor L ₁with the 4th reactor L ₄common port, the second reactor L ₂with the 5th reactor L ₅common port, the 3rd reactor L ₃all access high frequency carrier ripple filtering circuit 3 with the common port of the 6th reactor L6.

Described high frequency carrier filtering circuit 3, consist of three groups of C mode filters that adopt triangle to connect, and C mode filter wherein is by capacitor C ₁～C ₆, inductor L ₇～L ₉, resistor R ₁～R ₃form three filter branch that structure is identical, three filter branch adopt triangle to connect; The upper end of three filter branch connects with the mid point of three-phase input power and inverter circuit brachium pontis by inductor respectively.

The positive terminal of inverter bridge 4 is connected with the positive terminal of storage capacitor 5, and the negative pole end of inverter bridge leg 4 is connected with the negative pole end of storage capacitor 5.

Described digital signal processor 7 be take the digital signal processing circuit that digital signal processing chip is constructed as core, comprises DSP digital signal processing chip and the AD conversion chip, power supply chip, the level transferring chip that are connected with its signal.Wherein DSP is the TMS320F1812 digital signal processing chip, AD conversion chip (transducer) can be 12 modulus conversion chips of AD1674, level translator can be the ALVC level transferring chip, and power subsystem can be that the PS76CD301 chip provides the control power supply.

Described drive circuit 8 (seeing accompanying drawing 4-1～4-4), adopting 2sd315 is that core is constructed drive circuit.The chip of 44 pins in figure is 2sd315, other be device commonly used as resistance (code name is R), electric capacity (code name is C), diode (code name is D), voltage-stabiliser tube (code name is D) etc.

Described electric current and voltage sample circuit 1 comprises the current transformer of the voltage transformer for gathering line voltage, the voltage Hall that gathers storage capacitor voltage, collection load current and equipment output current, and will by voltage transformer, gather storage capacitor voltage the voltage Hall, gather the signal conditioning circuit that signal input that the current transformer of load current and equipment output current obtain consists of operational amplifier, then have described signal conditioning circuit that collected voltage, current signal are adjusted to setting range.

The method for supervising of described three-phase power equipment digital decoupling monitoring system comprises following steps:

1) obtain line voltage, by voltage, the Current Transformer of voltage Hall acquisition storage capacitor 5, obtain load current and equipment output current with voltage transformer, nurse one's health to the setting range value, become digital quantity after the AD conversion, send into digital signal processing chip.

2) mains voltage signal obtains electric network voltage phase after software phase-lock loop 9 (SPLL), generates thus the sine and cosine reference signal 16sinw under each Frequency point ₁t, cosw ₁t, sinw ₂t, cosw ₂t, sinw _nt, cosw _nt.

3) Current Transformer obtains load current and equipment output current, and the two difference DELTA ia, Δ ib, Δ ic be id1, iq1, id2, iq2 and idn, the iqn after following orthogonal coordinate conversion obtains decoupling zero respectively under each frequency.

I=1,2 wherein ... n

Id1, iq1, id2, iq2 and idn, iqn obtain DC quantity idl1, iql1, idl2, iql2 and idn1, iqn2 after low-pass filtering LPF.Idl1, iql1, idl2, iql2 and idln, iqln be adjusted device output ido1, iqo1, ido2, iqo2 and idon, iqon after PI regulates, then obtains respectively ido and iqo after summation:

$\mathrm{ido}=\underset{i=\mathrm{1,2}...n}{\mathrm{\Σ}}\mathrm{idli}$

$\mathrm{iqo}=\underset{i=\mathrm{1,2},...n}{\mathrm{\Σ}}\mathrm{iqli}$

Wherein the parameter of the pi regulator under each frequency can arrange separately, optimal control.

4) ido and iqo obtain idr and iqr after interior circular current is regulated, then control drive circuit 8 work through the software space vector generator, drive power device S1, S2, S3, S4, S5 and S6 in inverter bridge 4.Finally realize the astatic control of each secondary frequencies controlled device.

The digital decoupling control method of described three-phase electric power apparatus, consist of the PI control 10 of software phase-lock loop 9 (SPLL), frequency 1, the PI control 11 of frequency 2, PI control 12, outer shroud voltage-regulation 13, the adjusting 14 of interior circular current and the space vector generator 15 of frequency i.Wherein:

Uga, ugb, ugc are electrical network A phase, B phase and C phase voltage, and ila, ilb and ilc are load current, A phase, B phase and C phase current that ifa, ifb, ifc are equipment output.The difference that Δ ia is ila and ifa, the difference that Δ ib is ilb and ifb, the difference that Δ ic is ilc and ifc.

Sinw1t, cosw1t are sine and the cosine reference signal under frequency 1.Id1, iq1 are respectively Δ ia, Δ ib, the output variable of Δ ic after coordinate transform (C321).Idl1, iql1 are respectively id1, the iq1 output variable after low pass filter (LPF).Ido1, iqo1 are respectively idl1, the iql1 output variable after PI controller (PI).

Sinw ₂t, cosw ₂t is sine and the cosine reference signal under frequency 2.Id2, iq2 are respectively Δ ia, Δ ib, the output variable of Δ ic after coordinate transform (C322).Idl2, iql2 are respectively id2, the iq2 output variable after low pass filter (LPF).Ido2, iqo2 are respectively idl2, the iql2 output variable after PI controller (PI).

Sinw _nt, cosn _nt is sine and the cosine reference signal under frequency i.Idn, iqn are respectively Δ ia, Δ ib, the output variable of Δ ic after coordinate transform (C32n).Idln, iqln are respectively idn, the iqn output variable after low pass filter (LPF).Idon, iqon are respectively idln, the iqln output variable after PI controller (PI).

The output that ido is PI controller under all frequencies (ido1, ido2 ... idon) and, the output that iqo is PI controller under all frequencies (iqo1, iqo2 ... iqon) and.

Idr, iqr are respectively ido, iqo and regulate the output after 14 through interior circular current.

The voltage that udc is storage capacitor 5.Udcr is given voltage.Idcd is the output through the outer shroud voltage-regulation of udcr and udc difference.

Embodiment 1 (the present invention is applied to Active Power Filter-APF)

Be connected with active power filter and harmonic source load according to Fig. 6, current transformer detects harmonic source load output current.Management goal is to offset by the Active Power Filter-APF of this method the harmonic source that the harmonic source load produces, and guarantees that the power network current harmonic content meets the improvement requirement.The fundamental current of harmonic source load is 50Hz, and main harmonic current is 250Hz, 350Hz, 550Hz, 650Hz, 850Hz and 950Hz.

As shown in Figure 7, the power network current waveform seriously distorts for power network current waveform before Active Power Filter-APF drops into and aberration rate, and aberration rate is up to approximately 28%.

As shown in Figure 8, after administering, power network current sine degree is good for power network current waveform after adopting the Active Power Filter-APF of digital decoupling control method of the present invention to drop into and aberration rate, and wave distortion is little, and aberration rate approximately 4%, reached good regulation effect.

As shown in Figure 9, the power network current distortion is still very serious for power network current waveform after adopting the Active Power Filter-APF of the digital control method of traditional monocycle to drop into and aberration rate, aberration rate approximately 23%.

Embodiment 2 (the present invention is in the application of high-power electric current source type signal generator)

Connect high-power electric current source type signal generator and derived reference signal by Figure 10, the output current in current transformer reference signal detection source.Object of experiment is to offset the signal that derived reference signal produces, and the reference current that signal source produces is mainly 250Hz, 350Hz electric current.If signal is unmatched, unmatched part will produce harmonic voltage on line voltage, cause the line voltage distortion.

Figure 11 is signal generator output current and the line voltage that adopts digital decoupling control method of the present invention.The line voltage distortion is less.

Figure 12 is signal generator output current and the line voltage that adopts the digital control method of traditional monocycle.With Figure 11, compare, the traditional approach output current shown in Figure 10 is less than normal, and unmatched electric current causes the line voltage distortion.By contrast, adopt the inventive method successful good.

Claims (8)

1. a three-phase power equipment digital decoupling method for supervising, it is characterized in that: described three-phase power equipment digital decoupling method for supervising comprises following steps:

1) obtain line voltage, by voltage, the Current Transformer of voltage Hall acquisition storage capacitor (5), obtain load current and equipment output current with voltage transformer, nurse one's health to the setting range value, become digital quantity after the AD conversion, send into digital signal processing chip;

2) mains voltage signal obtains electric network voltage phase after software phase-lock loop (9), generates thus the sine and cosine reference signal sinw under each Frequency point ₁t, cosw ₁t, sinw ₂t, cosw ₂t, sinw _nt, cosw _nt;

3) Current Transformer obtains load current and equipment output current, and the difference DELTA ia of this load current and this equipment output current, Δ ib, Δ ic be id1, iq1, id2, iq2 and idn, the iqn after following orthogonal coordinate conversion obtains decoupling zero respectively under each frequency

$\left[\begin{array}{c}\mathrm{idi}\\ \mathrm{iqi}\end{array}\right]=\left[\begin{array}{ccc}\cos w_{i}t& \cos (w_{i}t+\frac{2}{3}\mathrm{\π})& \cos (w_{i}t+\frac{4}{3}\mathrm{\π})\\ \sin w_{i}t& \sin (w_{i}t+\frac{2}{3}\mathrm{\π})& \sin (w_{i}t+\frac{4}{3}\mathrm{\π})\end{array}\right]\left[\begin{array}{c}\mathrm{\Δia}\\ \mathrm{\Δib}\\ \mathrm{\Δic}\end{array}\right]$

I=1,2 wherein ... n

Id1, iq1, id2, iq2 and idn, iqn obtain DC quantity idl1, iql1, id12, iq12 and idn1, iqn2 after low-pass filtering LPF, idl1, iql1, id12, iq12 and idln, iqln be adjusted device output idol, iqo1, ido2, iqo2 and idon, iqon after PI regulates, then obtains ido and iqo respectively after summation;

$\mathrm{ido}=\underset{i=\mathrm{1,2}...n}{\mathrm{\Σ}}\mathrm{idli}$

$\mathrm{iqo}=\underset{i=\mathrm{1,2}...n}{\mathrm{\Σ}}\mathrm{iqli}$

Wherein the parameter of the pi regulator under each frequency can arrange separately, optimal control;

4) ido and iqo obtain idr and iqr after interior circular current is regulated, then control drive circuit (8) work through the software space vector generator, drive power device S1, S2, S3, S4, S5 and S6 in inverter bridge (4); Finally realize the astatic control of each secondary frequencies controlled device.

2. a three-phase power equipment digital decoupling monitoring system, comprise inverter bridge (4), high-frequency filter circuit (2), electric current and voltage sample circuit (1), digital signal processor (7), drive circuit (8) and man-machine interface (6), it is characterized in that: a three phase mains accesses respectively the corresponding input of voltage source sample circuit (1), and be electrically connected to two other interface of described digital signal processor (7) with digital signal processor (7) by output interface; One of them interface connects man-machine interface (6), and another interface connects drive circuit (8), also by drive circuit (8), connects inverter bridge (4); Simultaneously, elongated end after described three phase mains access voltage source sample circuit (1) access respectively high-frequency filter circuit (2) the corresponding interface end, and connect to form inverter bridge leg (4) upper high-power switch tube S1, S2, S3, S4, the corresponding link of S5, S6 through three outputs of this high-frequency filter circuit (2) again, form thus whole three-phase electric power apparatus supervisory control system;

Described three-phase power equipment digital decoupling monitoring system is used three-phase power equipment digital decoupling method for supervising as claimed in claim 1.

3. a kind of three-phase power equipment digital decoupling monitoring system as claimed in claim 2, it is characterized in that: described high-frequency filter circuit (2) consists of 6 reactors and high frequency carrier ripple filtering circuit; The first reactor L wherein ₁with the 4th reactor L ₄be connected, the second reactor L ₂with the 5th reactor L ₅be connected, the 3rd reactor L ₃with the 6th reactor L ₆be connected, described the first reactor L ₁with the 4th reactor L ₄common port, the second reactor L ₂with the 5th reactor L ₅common port, the 3rd reactor L ₃with the 6th reactor L ₆common port all access high frequency carrier ripple filtering circuit (3).

4. a kind of three-phase power equipment digital decoupling monitoring system as claimed in claim 3 is characterized in that: described high frequency carrier ripple filtering circuit (3), by three groups of C mode filters that adopt triangle to connect, formed, and C mode filter wherein is by capacitor C ₁～C ₆, inductor L ₇～L ₉, resistor R ₁～R ₃form three filter branch that structure is identical, three filter branch adopt triangle to connect; The upper end of three filter branch connects with the mid point of three-phase input power and inverter circuit brachium pontis by inductor respectively.

5. a kind of three-phase power equipment digital decoupling monitoring system as claimed in claim 2, it is characterized in that: the positive terminal of described inverter bridge (4) is connected with the positive terminal of storage capacitor (5), and the negative pole end of inverter bridge (4) is connected with the negative pole end of storage capacitor (5).

6. a kind of three-phase power equipment digital decoupling monitoring system as claimed in claim 2, it is characterized in that: described digital signal processor (7) be take the digital signal processing circuit that digital signal processing chip is constructed as core, comprises DSP digital signal processing chip and the AD conversion chip, power supply chip, the level transferring chip that are connected with its signal.

7. a kind of three-phase power equipment digital decoupling monitoring system as claimed in claim 2 is characterized in that: it is that core is constructed drive circuit that described drive circuit (8) adopts 2sd315.

8. a kind of three-phase power equipment digital decoupling monitoring system as claimed in claim 2, it is characterized in that: described electric current and voltage sample circuit (1) comprises voltage transformer for gathering line voltage, gather the voltage Hall of storage capacitor voltage, gather the current transformer of load current and equipment output current, and will by voltage transformer, gather storage capacitor voltage the voltage Hall, gather the signal conditioning circuit that signal input that the current transformer of load current and equipment output current obtain consists of operational amplifier; By described signal conditioning circuit, collected voltage, current signal are adjusted to setting range again.

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