CN203103959U - Three-phase electric power feedback device suitable for hysteresis control and alternating-current transmission system - Google Patents

Abstract

The utility model provides a three-phase electric power feedback device suitable for hysteresis control. The three-phase electric power feedback device comprises a filtering unit and a power switch unit serially connected between a three-phase power network and a three-phase inverter in sequence, wherein the filtering unit comprises at least three filtering capacitor assemblies and two three-phase inductors; the filtering capacitor assemblies are connected with both ends of a direct-current bus in parallel; each filtering capacitor assembly comprises two filtering capacitors; the filtering capacitors are serially connected with both ends of the direct-current bus; the two three-phase inductors are serially connected between the three-phase power network and the power switch unit in sequence; and the joint of the filtering capacitors in each filtering capacitor assembly is connected with the joint of the two three-phase inductors. By using the three-phase electric power feedback device, a diode rectifying device in parallel connection with the three-phase electric power feedback device is incapable of generating pulse current, and the effect of protecting a circuit of the power network and peripheral electronic equipment of the power network is achieved.

Description

Be applicable to the three-phase electric energy feedback device and the alternating-current actuating system of the ring control that stagnates

Technical field

The utility model relates to electric power network technique, relates in particular to a kind of three-phase electric energy feedback device and alternating-current actuating system that is applicable to the ring control that stagnates.

Background technology

In universal frequency converter, nearly all three-phase alternating current is carried out rectification, thereby provide direct voltage for dc bus with the diode rectification device.Such frequency converter does not have the function of feedback, and the electric energy that the motor regenerative braking produces can only consume with resistance.Realize the feedback function of universal frequency converter, simple and cost-effective method is exactly a direct cover three-phase electric energy feedback device in parallel between dc bus and three phase network.At this moment, the three-phase electric energy feedback device just and the diode rectification device be directly parallel in together, as shown in Figure 1.

The three-phase electric energy feedback device is as the three-phase electric energy feedback device of an independence, external hanging type at this moment, and when motor is in braking or load towing astern, motor will be in generating state, and to the dc-link capacitance charging, DC bus-bar voltage rises.When voltage rises to certain value, 620 volts or 751 volts or 1077 volts (corresponding 620 volts of 380 volts of AC network for example, corresponding 751 volts of 460 volts of AC network, corresponding 1077 volts of 660 volts of AC network), the three-phase electric energy feedback device is started working, electric energy on the dc-link capacitance is in time fed back to electrical network, make DC bus-bar voltage maintain the scope of a safety.When motor braking finishes or no longer is in the towing astern state, when motor entered motoring condition, DC bus-bar voltage began to descend.When voltage drops to set point, be assumed to be 615 volts or 745 volts or 1070 volts, the three-phase electric energy feedback device then quits work.The three-phase electric energy feedback device repeats feedback → stop → feedback always ... such process.

This feedback of three-phase electric energy feedback device → stop → feedback ... repetitive process, very perfect outwardly, thoroughly change the shortcoming that the universal frequency converter electric energy can not feedback.Why say very perfect outwardly, be because can think very intuitively on the surface: when DC bus-bar voltage is elevated to certain value, during as 620 volts or 751 volts or 1077 volts, can think in the nature of things that the diode rectification device is in the state that ends, regenerative electric energy can be fed to electrical network from the three-phase electric energy feedback device.But in fact really not so, both can produce following circulation problem in parallel the application.

The use in parallel of three-phase electric energy feedback device and diode rectification device is far to the eye so simple.If electric energy feedback apparatus not in parallel, when DC bus-bar voltage was higher than 620 volts or 751 volts or 1077 volts, the diode rectification device was in cut-off state certainly; But when both application in parallel, will form a kind of new topological structure, as shown in Figure 1, when DC bus-bar voltage is higher than 620 volts or 751 volts or 1077 volts, the three-phase electric energy feedback device enters operating state, six IGBT or MOSFET will enter the switch modulation state, the influence that is subjected to bridge IGBT or MOSFET to open off state, by formula (2) as can be known

$V_{\mathrm{NO}}=\frac{V_{\mathrm{dc}}}{3}(S_a+S_b+S_c)$ Formula (2)

Wherein, V _DcBe the voltage at dc bus two ends, the N point is the negative terminal of dc bus, and the O point is the neutral point of three phase network, S _a, S _b, S _cBe respectively the on off state of bridge switch on the three-phase power switch device, 0 expression is closed, and the current potential V that the N point is ordered with respect to O is opened in 1 expression _NOWill produce floats changes.After being example analysis explanation three-phase electric energy feedback device and the parallel connection of diode rectification device mutually with U below, electric energy feedback apparatus is to the influence of diode rectification device.

Because vector control only is applicable to three-phase symmetrical power voltage, establishes three-phase symmetric voltage and be:

$\left\{\begin{array}{c}{V}_u=E_m\sin \mathrm{\θ}\\ V_v=E_m\sin (\mathrm{\θ}-\frac{2\mathrm{\π}}{3})\\ V_w=E_m\sin (\mathrm{\θ}+\frac{2\mathrm{\π}}{3})\end{array}\right.$ Formula (3)

Wherein, three-phase voltage can be 380 volts of AC system, or 460 volts of AC system, or 660 volts of AC system; E _mAmplitude for the electrical network phase voltage.

V _D2Expression diode rectification device U descends the reverse pressure drop in bridge diode two ends, V mutually _D1Expression diode rectification device U goes up the reverse pressure drop in bridge diode two ends mutually, by Kirchhoff's second law as can be known:

$\left\{\begin{array}{c}{V}_{\mathrm{<figure-callout\; id="2"\; label="d"\; filenames="HDA00002973168700021.png"\; state="\{\{state\}\}">d</figure-callout>}2}+V_{\mathrm{NO}}-V_u=0\\ {-V}_{d1}+V_{\mathrm{dc}}+V_{\mathrm{NO}}-V_u=0\end{array}\right.$ Formula (4)

Formula (2) and formula (3) substitution formula (4) can be obtained V _D2And V _D1For:

$\left\{\begin{array}{c}{\mathrm{<figure-callout\; id="2"\; label="V\; d"\; filenames="HDA00002973168700021.png"\; state="\{\{state\}\}">V</figure-callout>}}_d=E_m\sin \mathrm{\&theta;}+\frac{V_{\mathrm{dc}}}{3}(S_a+S_b+S_c)\\ V_{d1}=\frac{V_{\mathrm{dc}}}{3}(3-S_a-S_b-S_c)-E_m\sin \mathrm{\&theta;}\end{array}\right.$ Formula (5)

Because V _D2, V _D1Represent diode d respectively ₁And d ₂Reverse pressure drop, so work as V _D1＜0, diode d ₁Will conducting; Work as V _D2＜0, diode d ₂Will conducting.By formula (5) as can be seen, along with S _a, S _bAnd S _cThe variation of the difference of on off state and phase angle θ, V _D2, V _D1Value can for example work as S less than zero at any time _a=0, S _b=0, S _cDuring=0 and θ=1.5 π, V _D2=-E _m, diode d ₂Conducting; Work as S _a=1, S _b=1, S _cDuring=1 and θ=0.5 π, V _D1=-E _m, diode d ₁Conducting.Diode d ₁And d ₂In case conducting is passed through having very big pulse current, has promptly produced loop current.In like manner can analyze the situation of V phase and W diode phase.

After above-mentioned analysis is exactly the use in parallel of three-phase electric energy feedback device and diode rectification device, as shown in Figure 1, the problem that the three-phase electric energy feedback device brings to the diode rectification device, and this problem is intrinsic, in a single day the IGBT or the MOSFET that are electric energy feedback apparatus enter modulation condition, and the diode rectification device just has pulse current to be passed through.This pulse current is depended merely on change feedback control algolithm and be can't resolve at all, even in other words be exactly that the three-phase electric energy feedback device gets the feedback Current Control very good, current harmonics is up to state standards, the pulse current of diode rectification device can exist equally, be not subjected to the control of feedback device, and this Pulse Electric fails to be convened for lack of a quorum and directly enters electrical network, electrical network and peripheral electronic equipment are caused severe contamination, simultaneously, the excessive Pulse Electric of diode rectification device fails to be convened for lack of a quorum and causes that the diode rectification device seriously generates heat, even can damage the diode rectification device.

The utility model content

The technical problems to be solved in the utility model is to overcome above-mentioned the problems of the prior art, and a kind of three-phase electric energy feedback device and alternating-current actuating system that is applicable to the ring control that stagnates proposed, can prevent from effectively to produce pulse current with three-phase electric energy feedback device diode connected in parallel rectifying device, avoid the having a strong impact on of electronic equipment of pulse current to electrical network and periphery thereof, simultaneously, avoid the problems such as damage of pulse current to the diode rectification device.

For solving the problems of the technologies described above, the utility model proposes a kind of three-phase electric energy feedback device, it comprises filter unit and the power switch unit that is connected on successively between three phase network and the three-phase inverter, filter unit comprises at least three filter capacitor component and two three pole reactors, filter capacitor component is parallel to the two ends of dc bus, each filter capacitor component comprises two filter capacitors, filter capacitor is connected on the two ends of dc bus, two three pole reactors are connected between three phase network and the power switch unit successively, and the junction of the filter capacitor in each filter capacitor component connects two three pole reactors.

Preferably, filter unit comprises three filter capacitor component, and the junction of the filter capacitor of each filter capacitor component is connected with the junction of two three pole reactors.

Preferably, filter unit also comprises a three-phase common mode inductance, and the three-phase common mode inductance is connected between three phase network and two three pole reactors.

Preferably, filter unit comprises three filter capacitor component, and the junction of the filter capacitor of each filter capacitor component connects an end and the three phase network of two three pole reactors.

Preferably, filter unit also comprises a three-phase common mode inductance, and the three-phase common mode inductance is connected between the end of the junction of filter capacitor of filter capacitor component and three pole reactor.

Preferably, filter unit comprises six filter capacitor component, wherein the junction of the filter capacitor of three groups of filter capacitor component links to each other with the junction of two three pole reactors, and the junction of the filter capacitor of other three groups of filter capacitor component connects an end and the three phase network of two three pole reactors.

Preferably, filter unit also comprises a three-phase common mode inductance, and the three-phase common mode inductance is connected between the end near the junction of the filter capacitor of three groups of filter capacitor component of three phase network and two three pole reactors.

The utility model also proposes a kind of alternating-current actuating system, comprises aforesaid three-phase electric energy feedback device, diode rectification device and three-phase inverter; The diode rectification device connects three phase network, and three-phase inverter connects the diode rectification device, and the three-phase electric energy feedback device is in parallel with the diode rectification device.

Preferably, after the three-phase electric energy feedback device entered regenerating condition, the voltage at dc bus two ends satisfied:

V _Dc〉=2E _mFormula (1)

Wherein, V _DcBe the voltage at dc bus two ends, E _mPhase voltage amplitude for three phase network.

Compared with prior art; the beneficial effects of the utility model comprise: three-phase electric energy feedback device of the present utility model and alternating-current actuating system; by in the three-phase electric energy feedback device, filter unit being set; can make and can not produce pulse current with three-phase electric energy feedback device diode connected in parallel rectifying device; realize the control of circulation; thereby the electronic equipment of protection electrical network and periphery thereof, simultaneously, protection diode rectification device is not damaged.

Description of drawings

Fig. 1 is the circuit diagram of the alternating-current actuating system of prior art.

Fig. 2 is the circuit diagram of first embodiment of alternating-current actuating system of the present utility model.

Fig. 3 is the circuit diagram of second embodiment of alternating-current actuating system of the present utility model.

Fig. 4 is the circuit diagram of the 3rd embodiment of alternating-current actuating system of the present utility model.

Fig. 5 is the circuit diagram of the 4th embodiment of alternating-current actuating system of the present utility model.

Fig. 6 is the circuit diagram of the 5th embodiment of alternating-current actuating system of the present utility model.

Fig. 7 is the circuit diagram of the 6th embodiment of alternating-current actuating system of the present utility model.

Wherein, description of reference numerals is as follows: alternating-current actuating system 1 three-phase electric energy feedback device 11 filter units 111 power switch units 112 diode rectification devices 12 three-phase inverters 13 motors 2 loads 3 three phase networks 4 three pole reactor L ₁, L ₂Three-phase common mode inductance L filter unit Z.

Embodiment

In order to further specify principle of the present utility model and structure, now in conjunction with the accompanying drawings preferred embodiment of the present utility model is elaborated.

See also Fig. 2 to Fig. 7, a kind of three-phase electric energy feedback device 11 that is applicable to the ring control that stagnates of the present utility model, three-phase electric energy feedback device 11 is applied to alternating-current actuating system 1, and it comprises filter unit 111 and the power switch unit 112 that is connected on successively between three phase network 4 and the three-phase inverter 13.

Filter unit 111 comprises at least three filter capacitor component, two three pole reactor L ₁And L ₂And three-phase common mode inductance L.Each filter capacitor component is parallel to the two ends of dc bus, and each filter capacitor component comprises two filter capacitors, and filter capacitor is connected on the two ends of dc bus.Two three pole reactor L ₁And L ₂Be series between three phase network 4 and the power switch unit 112 three-phase common mode inductance L and two three pole reactor L successively ₁And L ₂Be connected between three phase network 4 and the power switch unit 112, the junction of the filter capacitor in each filter capacitor component connects described two three pole reactors.In the three-phase electric energy feedback device, increase the pulse current that three-phase common mode inductance L can suppress the diode rectification device better, make three-phase electric energy feedback device and the more reliable more stable operation of diode rectification device parallel connection.

See also Fig. 2 and Fig. 3, filter unit 111 comprises three filter capacitor component.The junction of the filter capacitor of each filter capacitor component and two three pole reactor L ₁And L ₂The junction connect, three-phase common mode inductance L is connected on three phase network 4 and two three pole reactor L ₁And L ₂Between.See also Fig. 2, Fig. 2 is the circuit diagram of first embodiment of alternating-current actuating system of the present utility model, is example with one of them branch road, is specially the O of filter capacitor component ₁End connects the P end of dc bus, the O of filter capacitor component ₂Termination dc bus N end, the c of filter capacitor component ₁End connects two three pole reactor L ₁And L ₂The junction.See also Fig. 3, Fig. 3 is the circuit diagram of second embodiment of alternating-current actuating system of the present utility model, and the difference of Fig. 3 and Fig. 2 is that a wherein end of three phase network 4 connects three-phase common mode inductance L and three pole reactor L ₁The back connects the c of filter capacitor component ₁End, the syndeton of two other branch road and this branch road are similar, repeat no more here.

See also Fig. 4 and Fig. 5, filter unit 111 comprises three filter capacitor component.The junction of the filter capacitor of each filter capacitor component and two three pole reactor L ₁, L ₂An end link to each other the junction of the filter capacitor of every group of filter capacitor component and three pole reactor L with three phase network ₁An end between be in series with a three-phase common mode inductance L, two three pole reactor L ₁, L ₂The other end connect the junction of power switch in the power switch assembly.See also Fig. 4, Fig. 4 is the circuit diagram of the 3rd embodiment of alternating-current actuating system of the present utility model, is example with one of them branch road, is specially the O of filter capacitor component ₁End connects the P end of dc bus, the O of filter capacitor component ₂Termination dc bus N end, the c of filter capacitor component ₁End connects two three pole reactor L ₁And L ₂The back connects power switch D ₁And D ₂The junction.See also Fig. 5, Fig. 5 is the circuit diagram of the 4th embodiment of alternating-current actuating system of the present utility model, and the difference of Fig. 5 and Fig. 4 is, the c of filter capacitor component ₁End connects three-phase common mode inductance L and three pole reactor L ₁, L ₂To power switch D ₁And D ₂The junction.The syndeton of two other branch road and this branch road are similar, also repeat no more here.

See also Fig. 6 and Fig. 7, filter unit 111 comprises six filter capacitor component.The wherein junction of the filter capacitor of every group of filter capacitor component of three groups and two three pole reactor L ₁, L ₂The junction link to each other respectively, the junction of the filter capacitor of other three groups of filter capacitor component connects two three pole reactor L ₁, L ₂An end and three phase network.Three-phase common mode inductance L is connected junction and the three pole reactor L near the filter capacitor of three groups of filter capacitor component of three phase network ₁Between.See also Fig. 6, Fig. 6 is the circuit diagram of the 5th embodiment of alternating-current actuating system of the present utility model, is example with one of them branch road, is specially the O of filter capacitor component ₁And O ₃End connects dc bus P end, the O of filter capacitor group ₂And O ₄End connects dc bus N end, the c of filter capacitor component ₁End connects two three pole reactor L ₁, L ₂The junction, c ₂End connects three pole reactor L ₁Junction with three phase network.See also Fig. 7, Fig. 7 is the circuit diagram of the 6th embodiment of alternating-current actuating system of the present utility model, and the difference of Fig. 7 and Fig. 6 is the c of filter capacitor component ₂End and three pole reactor L ₁Between the series connection three-phase common mode inductance L.The syndeton of two other branch road and this branch road are similar, also repeat no more here.

Power switch unit 112 comprises three groups of power switch assemblies that are parallel to the dc bus two ends, and the power switch assembly comprises two power switchs that are connected between the dc bus two ends.In the present embodiment, power switch is the IGBT(bipolar transistor) or the MOSFET(MOS pipe).

Describe operation principle of the present utility model in detail below in conjunction with Fig. 2 to Fig. 7.

Can obtain V by formula (3) and formula (4) _D1And V _D2Expression formula:

$\left\{\begin{array}{c}{\mathrm{<figure-callout\; id="2"\; label="V\; d"\; filenames="HDA00002973168700021.png"\; state="\{\{state\}\}">V</figure-callout>}}_d=E_m\sin \mathrm{\&theta;}-V_{\mathrm{NO}}\\ V_{d1}=V_{\mathrm{dc}}+V_{\mathrm{NO}}-E_m\sin \mathrm{\&theta;}\end{array}\right.$ Formula (6)

Make diode d ₁And d ₂Not having pulse current to flow through, then must be diode d ₁And d ₂Be in cut-off state, promptly require V _D1〉=0 and V _D2〉=0, substitution formula (6) then can be obtained the V that satisfies condition _NOFor:

E _m-V _Dc≤ V _NO≤-E _mFormula (7)

Formula (7) is further simplified, and then finally can obtain and satisfy diode d ₁And d ₂What do not have the pulse current condition is:

V _NO≤-E _m, V _Dc〉=2E _mFormula (8)

Therefore, after according to Fig. 2 to Fig. 7 alternating-current actuating system electric energy feedback topological structure being improved, can satisfy the condition of formula (8).When starting drive and motor 2 quit work, electrical network charges to dc-link capacitance fast by two groups of diodes, DC bus-bar voltage is increased to (corresponding 380 volts of network systems) or about 650 volts (corresponding 460 volts of network systems) or about 933 volts (corresponding 660 volts of network systems) about 537 volts, and this moment, electrical network continued the filter capacitor charging to filter capacitor component.Electrical network positive half wave voltage is by diode d ₁Or D ₁, d ₃Or D ₃And d ₅Or D ₅The time filter capacitor group continued charging, make the current potential V of the relative O of P point _POBe up to E _m, promptly 310 volts (corresponding 380 volts of network systems) or 375 volts (corresponding 460 volts of network systems) or 538 volts (corresponding 660 volts of network systems); The negative half-wave voltage of electrical network is by diode d ₂Or D ₂, d ₄Or D ₄And d ₆Or D ₆The time filter capacitor of filter capacitor component continued charging, make the current potential V of the relative O of N point _NOBe up to-E _m, promptly negative 310 volts (corresponding 380 volts of network systems) or negative 375 volts (corresponding 460 volts of network systems) or negative 538 volts (corresponding 660 volts of network systems) are so the current potential V of the relative N of P point _DcBe up to 2E _m, promptly 620 volts (corresponding 380 volts of network systems) or 751 volts (corresponding 460 volts of network systems) or 1077 volts (corresponding 660 volts of network systems), just in time satisfy the voltage at dc bus two ends shown in the formula (1):

V _Dc〉=2E _mFormula (1)

Wherein, V _DcBe the voltage at described dc bus two ends, E _mBe the phase voltage amplitude of described three phase network 4, thereby guarantee that diode ends reliably, do not have pulse current to flow through, thereby reach the purpose of control circulation.

When motor 2 enters electronic power consumption state, filter capacitor is because electric capacity is very little, can not provide electric energy for motor 2 as storage capacitor, so DC bus-bar voltage maintains (corresponding 380 volts of network systems) or about 650 volts (corresponding 460 volts of network systems) or about 933 volts (corresponding 660 volts of network systems) about 537 volts substantially, this moment, the working method of topological structure followed the working method when having only diode rectification device 12 just the same.When motor 2 is in regenerative braking or during by load 3 towing asterns, motor 2 enters generating state, DC bus-bar voltage raises, and when DC bus-bar voltage is higher than 620 volts or 751 volts or 1077 volts, could satisfy V _Dc〉=2E _mCondition, diode rectification device 12 just can be cut off fully, does not have pulse current to flow through, and reaches the purpose of control circulation.So DC bus-bar voltage V is set _Dc=2E _mBe the threshold voltage of three-phase electric energy feedback device 11, have only when DC bus-bar voltage to be higher than 2E _mDuring volt, three-phase electric energy feedback device 11 just can enter regenerating condition.At this moment, V _POCan center on Fluctuation up and down, V _NOCan center on

Fluctuation up and down, its mean value

With

For:

$\left\{\begin{array}{c}{\stackrel{\&OverBar;}{V}}_{\mathrm{PO}}=\frac{V_{\mathrm{dc}}}{2}\\ {\stackrel{\&OverBar;}{V}}_{\mathrm{NO}}=-\frac{{\mathrm{<figure-callout\; id="2"\; label="V\; dc"\; filenames="HDA00002973168700021.png"\; state="\{\{state\}\}">V</figure-callout>}}_{\mathrm{dc}}}{2}\end{array}\right.,{2E}_m<V_{\mathrm{dc}}$ Formula (9)

Formula (9) still satisfies the condition of formula (1) and formula (8), so DC bus-bar voltage is higher than 2E _mVolt after three-phase electric energy feedback device 11 enters regenerating condition, can guarantee that diode rectification device 12 is cut off fully, does not have pulse current to flow through, and realizes the inhibition control purpose of circulation.

It should be noted that the topological structure after improvement, extremely shown in Figure 7 as Fig. 2, after three-phase electric energy feedback device 11 enters the current feedback electric network state, c ₁The current potential that the relative O of point is ordered is

So can get the voltage range of filter capacitor group:

$\left\{\begin{array}{c}{V}_{{\mathrm{Pc}}_1}=V_{\mathrm{PO}}-V_{c_{1}O}\&ap;\frac{V_{\mathrm{dc}}}{2}-E_m\sin \mathrm{\&theta;}\&le;\frac{{\mathrm{<figure-callout\; id="2"\; label="V\; dc"\; filenames="HDA00002973168700021.png"\; state="\{\{state\}\}">V</figure-callout>}}_{\mathrm{dc}}}{2}+E_m\\ V_{c_{1}N}=V_{c_{1}O}-V_{\mathrm{NO}}\&ap;E_m\sin \mathrm{\&theta;}+\frac{{\mathrm{<figure-callout\; id="2"\; label="V\; dc"\; filenames="HDA00002973168700021.png"\; state="\{\{state\}\}">V</figure-callout>}}_{\mathrm{dc}}}{2}\&le;\frac{{\mathrm{<figure-callout\; id="2"\; label="V\; dc"\; filenames="HDA00002973168700021.png"\; state="\{\{state\}\}">V</figure-callout>}}_{\mathrm{dc}}}{2}+E_m\end{array}\right.,V_{\mathrm{dc}}>{2E}_m$ Formula (10)

By formula (10) as can be seen, the electric pressure of filter capacitor group require at least be: greater than

Volt is promptly greater than 620 volts (corresponding 380 volts of network systems) or greater than 751 volts (corresponding 460 volts of network systems) or greater than 1077 volts (corresponding 660 volts of network systems).

In alternating-current actuating system, general three-phase electric energy feedback unit all has two kinds of control modes: feedback unit vector control or hysteresis current control.The utility model only is applicable to the latter, because the magnitude of voltage that this moment, N held relative O to hold does not meet the voltage request under the vector control, promptly formula (9) does not meet formula (2):

$V_{\mathrm{NO}}=-\frac{V_{\mathrm{dc}}}{3}(S_a+S_b+S_c)$ Formula (2)

Therefore, under the topological mechanism of this kind, vector control no longer is suitable as current feedback power grid control of the present utility model.Simultaneously, because hysteresis current control can serve as with reference to the feedback electric current is carried out tracking Control with the three-phase instruction current, and the control of three-phase current is separate, so circuit structure of the present utility model only is suitable for electric energy feedback control when hysteresis current is controlled.

Compared with prior art; adopt three-phase electric energy feedback device and the alternating-current actuating system that is applicable to the ring control that stagnates of the present utility model; by in the three-phase electric energy feedback device, filter unit being set; can make and can not produce pulse current with three-phase electric energy feedback device diode connected in parallel rectifying device; realize the control of circulation; thereby the electronic equipment of protection electrical network and periphery thereof, simultaneously, protection diode rectification device is not damaged.

The above only is a preferable possible embodiments of the present utility model, and unrestricted protection range of the present utility model.The equivalent structure that all utilization the utility model specifications and accompanying drawing content have been done changes, and all is included in the protection range of the present utility model.

Claims (9)

1. one kind is applicable to the stagnant three-phase electric energy feedback device that encircles control, and it comprises filter unit and the power switch unit that is connected on successively between three phase network and the three-phase inverter, it is characterized in that,

Described filter unit comprises at least three filter capacitor component and two three pole reactors, described filter capacitor component is parallel to the two ends of described dc bus, each described filter capacitor component comprises two filter capacitors, described filter capacitor is connected on the two ends of described dc bus, described two three pole reactors are connected between described three phase network and the described power switch unit successively, and the junction of the filter capacitor in each described filter capacitor component connects described two three pole reactors.

2. three-phase electric energy feedback device as claimed in claim 1 is characterized in that, described filter unit comprises three filter capacitor component, and the junction of the filter capacitor of each described filter capacitor component is connected with the junction of described two three pole reactors.

3. three-phase electric energy feedback device as claimed in claim 2 is characterized in that, described filter unit also comprises a three-phase common mode inductance, and described three-phase common mode inductance is connected between described three phase network and two three pole reactors.

4. three-phase electric energy feedback device as claimed in claim 1, it is characterized in that, described filter unit comprises three filter capacitor component, and the junction of the filter capacitor of each described filter capacitor component connects an end and the described three phase network of described two three pole reactors.

5. three-phase electric energy feedback device as claimed in claim 4, it is characterized in that, described filter unit also comprises a three-phase common mode inductance, and described three-phase common mode inductance is connected between the end of the junction of filter capacitor of described filter capacitor component and described three pole reactor.

6. three-phase electric energy feedback device as claimed in claim 1, it is characterized in that, described filter unit comprises six filter capacitor component, wherein the junction of the filter capacitor of three groups of described filter capacitor component links to each other with the junction of described two three pole reactors, and the junction of the filter capacitor of other three groups of described filter capacitor component connects an end and the described three phase network of described two three pole reactors.

7. three-phase electric energy feedback device as claimed in claim 6, it is characterized in that, described filter unit also comprises a three-phase common mode inductance, and described three-phase common mode inductance is connected between the end near the junction of the filter capacitor of three groups of described filter capacitor component of described three phase network and described two three pole reactors.

8. an alternating-current actuating system is characterized in that, comprises as claim 1 to 7 any described three-phase electric energy feedback device, diode rectification device and a three-phase inverter; Described diode rectification device connects three phase network, and described three-phase inverter connects described diode rectification device, and described three-phase electric energy feedback device is in parallel with described diode rectification device.

9. alternating-current actuating system as claimed in claim 8 is characterized in that, after described three-phase electric energy feedback device entered regenerating condition, the voltage at described dc bus two ends satisfied:

V _Dc〉=2E _mFormula (1)

Wherein, V _DcBe the voltage at described dc bus two ends, E _mPhase voltage amplitude for described three phase network.

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