CN2039082U - Series operating unit for a current type inverter - Google Patents
Series operating unit for a current type inverter Download PDFInfo
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- CN2039082U CN2039082U CN 88214034 CN88214034U CN2039082U CN 2039082 U CN2039082 U CN 2039082U CN 88214034 CN88214034 CN 88214034 CN 88214034 U CN88214034 U CN 88214034U CN 2039082 U CN2039082 U CN 2039082U
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- inverter
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- capacitor
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Abstract
The utility model discloses a series operating device for current type inverter which can enhance the output voltage class through connecting n groups (n is equal or more than two and is an integer) of inverters in series. The utility model is mainly technically characterized in that capacitor C-[1], capacitor C-[2],... capacitor C-[n] is used to separate pressure so that the reliability of the dynamic procedure of each inverter is ensured; the separated pressure of the capacitor C-[1] and the capacitor C-[2] is stable through by-pass inductor L-[P] without direct current component; the uniformity of the current of each inverter is maintained by the equal current triggering system of a rectifier; in-phase pulse is used by the triggering of the inverter of each group so that the output voltage of the inverter of each group is in the same frequency and phase in general. The utility model is mainly fit for the static conversion frequency places of needing big capacity, high voltage and high frequency.
Description
The utility model belongs to the electric and electronic technical field of electrician's subject.
The output voltage of current source inverter is subjected to the restriction of device withstand voltages such as thyristor, and especially high speed thyristor voltage is not high, and bulk loads often requires with higher voltage power supply.The way that solves both at home and abroad mainly is to adopt two or many thyristor series operations at present.But there is dynamic pressure problem in thyristor series connection, the series connection of thyristor difficulty more under the dispersed bigger situation of especially higher in frequency, high speed thyristor.
The purpose of this utility model is to propose a kind of new solution of two or more sets load current-change formula current mode thyristor inverter (hereinafter to be referred as inverter) series operation devices, can improve the output voltage grade effectively.
Typical DC-to-AC converter as depicted in figs. 1 and 2.Modern is example explanation the technical program with single-phase.If load be an equivalence L, r inductive circuit (actual loading can for inductance, electric capacity, resistance, electronic device or/and the complex combination unit of electromagnetic and mechanical etc., but concerning certain frequency, it is equivalent to a L, r inductive circuit), capacitor C in parallel makes the power factor of total load circuit (loop that L, r are in parallel with C) leading.Like this, the inverter output current will be ahead of load voltage, become the load current-change formula.Simultaneously, DC power supply U
dThe big inductance L of having connected
d, make the electric current flat stable, become current mode.Adopt two groups or organize this inverter more in this programme, be connected, can realize the purpose of this utility model by the mode of Fig. 3 and Fig. 4.
Description of drawings:
Fig. 1 is the circuit diagram of one group of three-phase inverter;
Fig. 2 is the circuit diagram of one group of single-phase inverter;
Fig. 3 is two groups of identical single-phase inverter series operation circuit diagrams;
Fig. 4 also is two groups of identical single-phase inverter series operation circuit diagrams for to form DC power supply with rectifier.
Fig. 5 (a) is a kind of scheme circuit diagram that is connected in series of three groups of three-phase inverters;
Fig. 5 (b) is the vector correlation figure of the ac output voltage of Fig. 5 a scheme.
Further specify scheme of the present utility model with reference to accompanying drawing:
1. as shown in Figure 3, the utility model can adopt two groups of identical single-phase inverters to implement series operation.These two groups of inverters are by two isolated mutually DC power supply U
D1, U
D2Power supply.The output of two inverters is together in series power supply to L, r circuit and C load in parallel loop (C
1=C
2=2C, C
1, C
2The equivalent capacity of series connection is C).In the scheme with C
1, C
2The tie point b that mid point a and two inverters of series connection are connected be connected (as shown in phantom in Figure 3).And make two groups of synchronous pulse-triggered of inverter, to guarantee the output voltage U of two inverters
1And U
2Same frequency and same-phase basically.Like this, the voltage that is passed in the load is U
a=U
1+ U
2, U when two inverter work are identical
1=U
2=(U
a)/2.The input of two inverters need add current-sharing link E in scheme, and they are by regulating U
D1, U
D2To guarantee the output current I of two inverters
1, I
2Be more or less the same.
2. as shown in Figure 4, form DC power supply with rectifier.Two groups of rectifiers are powered by the common frequency power network of mutual isolation, and for example two by two transformers or a transformer pay the limits power supply.1 is the current-sharing link among the figure; 2 is the rectifier and trigger device.By controlling the triggering phase angle of two groups of rectifiers, can make the output current of two inverters equal substantially.3 is the inverter trigger, has only one 3 among the figure, represents the trigger same-phase of two groups of inverters.This scheme is in dynamic processes such as the switch or the change of current, and the output voltage of two groups of inverters will be by capacitor C separately
1, C
2Support, as long as C
1, C
2Enough big, make U in the dynamic process
1, U
2The instantaneous value ratio do not have significant change to get final product.Like this, in dynamic process, two groups of inverters are independent of each other, and adopt many thyristor series connection unlike prior art, wherein almost whole voltages will afford on this pipe when a thyristor turn-offs earlier, unless on every thyristor in parallel enough big dynamic antivibration circuit (this will cause bigger loss, and will be unpractical often when high frequency).This programme can allow two inverter current I
1And I
2Not exclusively equate, establish I
1-I
2=△ I, then △ I can be by the circulation of the dotted line between ab, as shown in Figure 3 and Figure 4.Like this, two groups of inverters are together in series and have both improved output voltage, and can make still the same with the unit reliability service of dynamic process and steady-state behaviours such as electric current, voltage, because of two inverters almost are independent of each other.If but (asymmetric as triggering) makes among the △ I and contain DC component for a certain reason, then this DC component can't be passed through C
1, C
2, need add by-pass inductor L in addition for this reason
PBe attempted by C
1Go up (shown in dotted line inductance among Fig. 4), allow the DC component among the △ I be circulated.L
PInductance value is very big, and interchange is bordering on open circuit.If triggering system can guarantee no DC component electric current among the △ I, C
1, C
2Last no DC component voltage, then L
PCan not connect.
When the output voltage that requires two groups of inverters is identical, should dispose C
1=C
2=2C.Inequality when the output voltage that requires two groups of inverters, be respectively U
1, U
2The time, should dispose:
C
1 
C×（ (U
1+ U
2)/(U
2) ）；
C
2 
C×（ (U
1+ U
2)/(U
2) ），
Wherein C is C
1, C
2The equivalent capacity of series connection.Change 1/ (C
1) and 1/ (C
2) ratio, can change U
1With U
2Ratio.
3. as mentioned above, Fig. 3 and Fig. 4 are the situation of two groups of inverter series connection, but scheme extends to more groups, such as the situation of n group (n is 〉=2 integer) inverter series connection.This moment C
1, C
2... C
nRespectively value be C * (U1+U2+... Un)/(U1), C * (U
1+ U
2+ ... U
n)/(U
2) ... C * (U
1+ U
2+ ... U
n)/(U
n), C wherein
1, C
2... C
nBe respectively the output end voltage of each inverter; C
1, C
2... C
nBe respectively the electric capacity that each inverter output end connects; C is C
1, C
2... C
nSeries equivalent capacitance.C and load circuit L, r compose in parallel load circuit.This moment C
1, C
2... C
nBetween the corresponding connection that is connected in series with each inverter of being connected in series a little respectively.Change ratio value 1/ (C
1): 1/ (C
2): ...: 1/ (C
n), can change U
1: U
2: ...: U
nWith Fig. 4 similarly at C
1, C
2... C
N-1Go up by-pass inductor L in parallel
pPerhaps also can be connected on other correct positions, as long as allow DC component electric current in a small amount be circulated.Perhaps triggering system can guarantee not have the DC component electric current, makes C
1, C
2... C
nLast no DC component voltage then can not meet L
pFrom above-mentioned situation, a kind of special case when visible Fig. 3, Fig. 4 only are n=2.
4. Fig. 3, Fig. 4 only are being connected in series of two groups of single-phase inverters, but its principle can promote the use of three-phase or polyphase inverter.Shown in Fig. 5 (a), be a kind of mode that is connected in series of three groups of three-phase inverters.The vector correlation of its ac output voltage is shown in Fig. 5 (b).Terminal A among Fig. 5
1, B
2, C
3Become three-phase output end A, B, C, terminal B
1With A
2, C
2With B
3, A
3With C
1Be three tie points.The dc inductance L of three groups of inverters among Fig. 5 (a)
dNeed on same iron core, and leakage inductance is very little each other, stablizes smooth to guarantee the total input current of three-phase.U among Fig. 5 (a)
D1, U
D2, U
D3Be the mutual DC power supply of isolating of three-phase, and U
D1=U
D2=U
D3Capacitor C among Fig. 5 (a)
1 1=C
1 2=C
1 3=2C, C are C
1 1C
1 2Or C
1 3C
1 1Series equivalent capacitance.In like manner extend to other connected modes, and being connected in series of more heterogeneous, more groups of inverters, with the further increase number of phases or improve output voltage.
5. Fig. 3 and Fig. 4 are series-fed, output voltage U
a=U
1+ U
2If desired, also two inverters of Fig. 3 and Fig. 4 can be become in parallel from the series connection reconfiguration, become the low-voltage power supply mode, this be because in this programme two inverters no matter dynamic process or steady-state behaviour all have relative independentability, so they can be arbitrarily become in parallel from the series connection reconfiguration, make this device become can high-low pressure conversion power supply inverter.If any more groups of inverters, then also can a part be connected into parallel connection, a part is connected into series connection.As long as there is suitable current-sharing link to exist, these inverters connection in series-parallel easily operation.
This programme also can be used in the inverter that self-turn-off device such as transistor forms.Because device such as transistor has self-switching-off capability, so the time as long as C
1, C
2... C
nCan keep the dynamic process of each inverter to be independent of each other basically and get final product, not need the compensating load circuit necessarily to reach leading power factor, promptly the load circuit power factor can be arbitrary value.
Advantage of the present utility model and effect are:
(1) the utility model can not only high voltage supply and is had the ability of low-voltage power supply concurrently, become can high-low pressure conversion power supply device.
(2) utilize capacitor C
1, C
2... C
n(n is 〉=2 integer) dividing potential drop can guarantee that the dynamic process of n group series inverter is reliable.
(3) by by-pass inductor L
PSo that C
1, C
2... C
nDividing potential drop is stable, no DC component.
(4) output voltage same frequency and the basic same-phase of the same-phase triggering system by inverter to keep each inverter.
(5) the current-sharing triggering system by rectifier is to keep the electric current uniformity of each inverter.
The utility model mainly is applicable to the static frequency-conversion occasion that needs big capacity, high voltage and upper frequency.
Claims (7)
1, the device that is connected in series of a kind of load current-change formula current source inverter (hereinafter to be referred as inverter) is characterized in that:
(1) n group (n is 〉=2 integer) input is isolated mutually, and output end voltage is respectively U
1, U
2... U
nInverter, be connected in series at output, receive then on the leading load circuit of power factor, load circuit is by L, r circuit (or the complex combination unit of being made up of inductance, electric capacity, resistance, semiconductor device, electromagnetic and mechanical etc., but can equivalently be L, r circuit to certain frequency) compose in parallel the voltage U on the load circuit with capacitor C
a=U
1+ U
2+ ... + U
n
(2) with n group capacitor C
1, C
2... C
nBe composed in series C, C is the series equivalent capacitance of this n group electric capacity, C
1, C
2... C
nValue is respectively:
C × (U
1+ U
2+… + U
n)/(U
1) 、C × (U
1+ U
2+… + U
n)/(U
2) 、…
C * (U
1+ U
2+ ... + U
n)/(U
n), with C
1, C
2... C
nBetween the corresponding connection that is connected in series of tie point and each inverter, be independent of each other U with the dynamic process that guarantees each inverter
1, U
2... U
nCan equate, or unequal;
(3) at capacitor C
1, C
2... C
N-1On, or on other can allow the position that the DC component electric current circulated and meet by-pass inductor L
p
(4) input at n group inverter adds the current-sharing link respectively;
(5) n group inverter adopts synchronous trigger impulse;
When (6) n group inverter was by several rectifier power supply, then the power frequency power supply of each rectifier should be isolated mutually;
2, device according to claim 1 is characterized in that adopting being connected in series of single-phase inverter.
3, device according to claim 1 is characterized in that adopting being connected in series of polyphase inverter.
4, device according to claim 1 is characterized in that n group inverter can be become to be connected in parallel by the series connection reconfiguration.
5, device according to claim 1 is characterized in that many group inverters can a part be connected into series connection, and another part is connected into parallel connection, becomes the connection in series-parallel operation.
6, device according to claim 1 is characterized in that above-mentioned inverter is made up of the thyristor device.
7, device according to claim 1 is characterized in that above-mentioned inverter is made up of self-turn-off devices such as transistors, if C
1, C
2... C
nKeep the dynamic process of each inverter to be independent of each other, then the load circuit power factor can be arbitrary value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88214034 CN2039082U (en) | 1988-09-15 | 1988-09-15 | Series operating unit for a current type inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88214034 CN2039082U (en) | 1988-09-15 | 1988-09-15 | Series operating unit for a current type inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2039082U true CN2039082U (en) | 1989-06-07 |
Family
ID=4847038
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88214034 Withdrawn CN2039082U (en) | 1988-09-15 | 1988-09-15 | Series operating unit for a current type inverter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2039082U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100380799C (en) * | 2004-11-10 | 2008-04-09 | 广州智光电机有限公司 | Electric contravariant system main loop topological structure with short-circuit protection and constituting method thereof |
| CN101697457A (en) * | 2009-10-22 | 2010-04-21 | 西安实新光伏有限责任公司 | Silicon-controlled based inverter for controlling DC-AC conversion |
| CN104836459A (en) * | 2015-06-10 | 2015-08-12 | 苏州市欧米伽智能控制技术有限公司 | High voltage direct screening variable voltage variable frequency stationary middle and low voltage reconfigurable output shore power supply |
| CN111900764A (en) * | 2020-08-07 | 2020-11-06 | 中国矿业大学 | Modulation current sharing method for modular three-phase five-level current type grid-connected inverter |
-
1988
- 1988-09-15 CN CN 88214034 patent/CN2039082U/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100380799C (en) * | 2004-11-10 | 2008-04-09 | 广州智光电机有限公司 | Electric contravariant system main loop topological structure with short-circuit protection and constituting method thereof |
| CN101697457A (en) * | 2009-10-22 | 2010-04-21 | 西安实新光伏有限责任公司 | Silicon-controlled based inverter for controlling DC-AC conversion |
| CN104836459A (en) * | 2015-06-10 | 2015-08-12 | 苏州市欧米伽智能控制技术有限公司 | High voltage direct screening variable voltage variable frequency stationary middle and low voltage reconfigurable output shore power supply |
| CN111900764A (en) * | 2020-08-07 | 2020-11-06 | 中国矿业大学 | Modulation current sharing method for modular three-phase five-level current type grid-connected inverter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |