CN102570884B - Ring current control method and device for inverter parallel system and inverter parallel system - Google Patents
Ring current control method and device for inverter parallel system and inverter parallel system Download PDFInfo
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- CN102570884B CN102570884B CN201110455918.1A CN201110455918A CN102570884B CN 102570884 B CN102570884 B CN 102570884B CN 201110455918 A CN201110455918 A CN 201110455918A CN 102570884 B CN102570884 B CN 102570884B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/487—Neutral point clamped inverters
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Abstract
The embodiment of the invention provides a ring current control method and device for an inverter parallel system and an inverter parallel system, which relate to the technical field of power supplies and are used for increasing the control accuracy of ring current in the inverter parallel system. The ring current control method of the inverter parallel system comprises the following steps of: acquiring the voltage increasing amount of a positive bus or negative bus of an inverter in the inverter parallel system caused by ring current in the inverter parallel system; acquiring first ring current which causes the increase of the voltage of the positive bus or negative bus according to the voltage increasing amount; sampling the ring current in the inverter parallel system through a current sampling circuit to obtain second ring current; and taking the current sum of the first ring current and the second ring current as current applied to current sharing control in the inverter parallel system.
Description
Technical field
The present invention relates to power technique fields, relate in particular to a kind of circular current control method, device and inverter parallel system of inverter parallel system.
Background technology
Due in inverter parallel system, participate in having difference more or less at aspects such as voltage, frequency, waveform, phase place or phase sequences between inverter in parallel, this species diversity can make the normal circulation of working of the system that exerted an influence in inverter in parallel, in order to eliminate the impact of this circulation on inverter parallel system, just need to control the circulation in inverter parallel system, by eliminating as much as possible the circulation in each inverter to being carried out sharing control by all inverters in parallel in system.At present, the method that industry adopts is the circulation size of each inverter in detection system, according to this circulation size, system is carried out to sharing control.
But, along with the quantity of inverter in inverter parallel system is more and more, can there is error for the circulation detection of inverter parallel system, cause the control of circulation accurately not, make still to exist in the system through controlling circlet stream.Taking three-level inverter as example, outside this definition sense of current flows to, it is positive direction, as shown in Figure 1, in this inverter, the lasting forward circulation of the negative busbar of flowing through successively capacitor C 2, switch Q4, switch Q3 and inductance L 1 can make the voltage of negative busbar capacitor C 2 raise.As shown in Figure 2, the lasting negative sense circulation of inductance L 1, switch Q2, switch Q1 and positive bus-bar capacitor C 1 and the negative busbar capacitor C 2 of flowing through successively in this inverter can make the voltage of positive bus-bar capacitor C 1 raise, as can be seen here, under the continuous action of circlet stream, be easy to occur that the bus capacitor voltage of part inverter constantly raises until the situation of overvoltage has caused adverse effect to system reliability service.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of circular current control method, device and inverter parallel system of inverter parallel system, improves the control precision to circulation in inverter parallel system.
For solving the problems of the technologies described above, embodiments of the invention adopt following technical scheme:
A circular current control method for inverter parallel system, comprising:
Obtain the voltage rise that the positive bus-bar of inverter in inverter parallel system or the circulation due to described inverter parallel system of negative busbar cause;
Obtain the first loop current that causes described positive bus-bar or negative busbar voltage to raise according to described voltage rise;
By current sampling circuit, the circulation in inverter parallel system is sampled, obtain the second loop current;
Using the electric current of described the first loop current and described the second loop current and in inverter parallel system for the circulation of sharing control.
A circulation control device for inverter parallel system, comprising:
Voltage rise acquiring unit, the voltage rise causing for obtaining the positive bus-bar of inverter parallel system inverter or the circulation due to described inverter parallel system of negative busbar;
The first loop current acquiring unit, for obtaining the first loop current that causes described positive bus-bar or negative busbar voltage to raise according to described voltage rise;
Current sampling circuit, samples for the circulation to inverter parallel system, obtains the second loop current;
Sharing control unit, for using the electric current of described the first loop current and described the second loop current and as inverter parallel system the circulation for sharing control.
A kind of inverter parallel system, comprising: the circulation control device that the inverter of alternating current is provided and the circulation in inverter parallel system is controlled for load of multiple parallel connections, and described circulation control device comprises:
Voltage rise acquiring unit, the voltage rise causing for obtaining the positive bus-bar of inverter parallel system inverter or the circulation due to described inverter parallel system of negative busbar;
The first loop current acquiring unit, for obtaining the first loop current that causes described positive bus-bar or negative busbar voltage to raise according to described voltage rise;
Current sampling circuit, samples for the circulation to inverter parallel system, obtains the second loop current;
Sharing control unit, for using the electric current of described the first loop current and described the second loop current and as inverter parallel system the circulation for sharing control.
The circular current control method of the inverter parallel system that the embodiment of the present invention provides, device and inverter parallel system, accurate not for the circulation that uses current sampling circuit to obtain in prior art, cause the sharing control of carrying out according to this circulation obtaining cannot avoid the voltage of the positive and negative busbar in inverter parallel system to raise until the situation of overvoltage occurs, the present invention adopts the voltage rising situation of real-time measurement bus, and according to this rising situation calculate cause busbar voltage raise circulation, the electric current of the circulation obtaining by this circulation and current sampling circuit and carry out sharing control, when busbar voltage raises, in time it is controlled, effectively avoid the positive and negative busbar voltage causing due to circulation effect in inverter parallel system to raise until the situation of overvoltage occurs, improve the accuracy of circulation control.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art 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, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the schematic diagram that in prior art, in inverter, forward circulation causes busbar voltage to raise;
Fig. 2 is the schematic diagram that in prior art, in inverter, negative sense circulation causes busbar voltage to raise;
Fig. 3 is the circular current control method flow chart of inverter parallel system in the embodiment of the present invention;
Fig. 4 is the schematic diagram of the circulation control device of inverter parallel system.
Embodiment
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, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The embodiment of the present invention provides a kind of circular current control method of inverter parallel system, and as shown in Figure 1, the method comprises:
101, obtain the voltage rise that the positive bus-bar of inverter in inverter parallel system or the circulation due to inverter parallel system of negative busbar cause;
In embodiments of the present invention, inverter parallel system comprises the inverter of multiple parallel connections, these inverters provide alternating current for the load being connected with its output, the rectifier of inverter inside can maintain voltage stable of the bus capacitor of inverter inside, but in the situation that rectifier does not have feedback ability, lasting forward or the circulation of negative sense can cause the voltage of positive and negative busbar constantly to raise until overvoltage, outside this definition sense of current flows to, it is positive direction, and the control method of available technology adopting cannot accurately be controlled the above-mentioned circulation that causes positive and negative busbar electric voltage over press, therefore, in embodiments of the present invention, first constantly obtain the voltage rise of positive and negative busbar, and after step in, according to this rise, intrasystem circulation is controlled more accurately.
102, obtain according to voltage rise the first loop current that causes positive bus-bar or negative busbar voltage to raise;
According to the positive bus-bar obtaining in step 101 or the voltage rise of negative busbar voltage, calculate the loop current that causes this voltage to raise, i.e. the first loop current.
103, by current sampling circuit, the circulation in inverter parallel system is sampled, obtains the second loop current.
104, using the electric current of the first loop current and the second loop current and in inverter parallel system for the circulation of sharing control.
Calculate the first loop current of obtaining in above-mentioned steps and the second loop current electric current and, then carry out sharing control by this electric current with to inverter parallel system.
The circular current control method of the inverter parallel system that the embodiment of the present invention provides, accurate not for the circulation that uses current sampling circuit to obtain in prior art, cause the sharing control of carrying out according to this circulation obtaining cannot avoid the voltage of the positive and negative busbar in inverter parallel system to raise until the situation of overvoltage occurs, the present invention adopts the voltage rising situation of real-time measurement bus, and according to this rising situation calculate cause busbar voltage raise circulation, the electric current of the circulation obtaining by this circulation and current sampling circuit and carry out sharing control, when busbar voltage raises, in time it is controlled, effectively avoid the positive and negative busbar voltage causing due to circulation effect in inverter parallel system to raise until the situation of overvoltage occurs, improve the accuracy of circulation control.
Further, in embodiments of the present invention, step 101 specifically comprises:
First, set the overvoltage set-point voltage of positive bus-bar and negative busbar, if the voltage of positive bus-bar or negative busbar is higher than overvoltage set-point voltage, the voltage rise that the circulation due to inverter parallel system that the voltage value that exceeded is positive bus-bar or negative busbar causes.Setting parameter overvoltage set-point voltage while normally work according to system, if the voltage of positive bus-bar or negative busbar exceedes this overvoltage set-point voltage and constantly raises, shows that intrasystem circulation just exerts an influence to the voltage of positive bus-bar or negative busbar.
Then, detect the positive bus-bar of inverter and the voltage of negative busbar, measure the voltage of electric capacity on positive and negative busbar simultaneously.
Subsequently, according to following three kinds of situations, the voltage rise producing due to circulation effect of positive bus-bar or negative busbar is judged:
If positive bus-bar voltage is greater than overvoltage set-point voltage, positive bus-bar voltage is greater than negative busbar voltage simultaneously, and obtaining voltage rise is the poor of overvoltage set-point voltage and positive bus-bar voltage.Even V1 > Vset & V1 > V2, Veer=Vset-V1, wherein, V1 is positive bus-bar voltage, and V2 is negative busbar voltage, and Vset is overvoltage set-point voltage, and Veer is voltage rise.
If negative busbar voltage is greater than overvoltage set-point voltage, negative busbar voltage is greater than positive bus-bar voltage simultaneously, and obtaining voltage rise is the poor of negative busbar voltage and overvoltage set-point voltage.Even V2 > Vset & V2 > Vi, Veer=V2-Vset.
If positive bus-bar voltage and negative busbar voltage are all less than overvoltage set-point voltage, obtaining voltage rise is zero.Even V1 < Vset & V2 < Vset, Veer=0.
Optionally, in embodiments of the present invention, step 102 specifically comprises: calculate and obtain the first loop current according to voltage rise passing ratio adjuster, proportional and integral controller or proportional integral derivative controller.Calculate according to voltage rise the loop current that causes voltage to raise.
Optionally, in embodiments of the present invention, step 104 specifically comprises: by counting circuit calculate the first loop current and the second loop current electric current and.Then according to this electric current calculating with inverter parallel system is controlled.
The embodiment of the present invention provides a kind of circulation control device of inverter parallel system simultaneously, and as shown in Figure 2, this device comprises:
Voltage rise acquiring unit 1, the voltage rise causing for obtaining the positive bus-bar of inverter parallel system inverter or the circulation due to inverter parallel system of negative busbar;
The first loop current acquiring unit 2, for obtaining the first loop current that causes positive bus-bar or negative busbar voltage to raise according to voltage rise;
Sharing control unit 4, for using the electric current of the first loop current and the second loop current and as inverter parallel system the circulation for sharing control.
Further, in embodiments of the present invention, voltage rise acquiring unit 1 comprises:
Setting device, for setting the overvoltage set-point voltage of positive bus-bar and negative busbar, if the voltage of positive bus-bar or negative busbar is higher than overvoltage set-point voltage, the voltage rise that the circulation due to inverter parallel system that the voltage value that exceeded is positive bus-bar or negative busbar causes;
Checkout gear, for detection of the positive bus-bar of inverter and the voltage of negative busbar;
Judge acquisition device, if be greater than overvoltage set-point voltage for positive bus-bar voltage, positive bus-bar voltage is greater than negative busbar voltage simultaneously, and obtaining voltage rise is the poor of overvoltage set-point voltage and positive bus-bar voltage;
If negative busbar voltage is greater than overvoltage set-point voltage, negative busbar voltage is greater than positive bus-bar voltage simultaneously, and obtaining voltage rise is the poor of negative busbar voltage and overvoltage set-point voltage;
If positive bus-bar voltage and negative busbar voltage are all less than overvoltage set-point voltage, obtaining voltage rise is zero.
Optionally, in embodiments of the present invention, the first loop current acquiring unit 2 comprises: proportional controller, proportional and integral controller or proportional integral derivative controller, and for calculating and obtain the first loop current according to voltage rise.
Optionally, in embodiments of the present invention, sharing control unit 4 comprises: counting circuit, for calculate the first loop current and the second loop current electric current and.
The embodiment of the present invention provides a kind of inverter parallel system simultaneously, as shown in Figure 4, this system comprises: the circulation control device 6 that the inverter 5 of alternating current is provided and the circulation in inverter parallel system is controlled for load 6 of multiple parallel connections, and circulation control device 6 comprises:
Voltage rise acquiring unit 1, the voltage rise causing for obtaining the positive bus-bar of inverter parallel system inverter or the circulation due to inverter parallel system of negative busbar;
The first loop current acquiring unit 2, for obtaining the first loop current that causes positive bus-bar or negative busbar voltage to raise according to voltage rise;
Sharing control unit 4, for using the electric current of the first loop current and the second loop current and as inverter parallel system the circulation for sharing control.
Further, in embodiments of the present invention, voltage rise acquiring unit 1 comprises:
Setting device, for setting the overvoltage set-point voltage of positive bus-bar and negative busbar, if the voltage of positive bus-bar or negative busbar is higher than overvoltage set-point voltage, the voltage rise that the circulation due to inverter parallel system that the voltage value that exceeded is positive bus-bar or negative busbar causes;
Checkout gear, for detection of the positive bus-bar of inverter and the voltage of negative busbar;
Judge acquisition device, if be greater than overvoltage set-point voltage for positive bus-bar voltage, positive bus-bar voltage is greater than negative busbar voltage simultaneously, and obtaining voltage rise is the poor of overvoltage set-point voltage and positive bus-bar voltage;
If negative busbar voltage is greater than overvoltage set-point voltage, negative busbar voltage is greater than positive bus-bar voltage simultaneously, and obtaining voltage rise is the poor of negative busbar voltage and overvoltage set-point voltage;
If positive bus-bar voltage and negative busbar voltage are all less than overvoltage set-point voltage, obtaining voltage rise is zero.
Optionally, in embodiments of the present invention, the first loop current acquiring unit 2 comprises: proportional controller, proportional and integral controller or proportional integral derivative controller, and for calculating and obtain the first loop current according to voltage rise.
Optionally, in embodiments of the present invention, sharing control unit 4 comprises: counting circuit, for calculate the first loop current and the second loop current electric current and.
Below the workflow to above-mentioned inverter parallel system is described, first, setting parameter overvoltage set-point voltage Vset while normally work according to system, then, detect the positive bus-bar V1 of inverter and the voltage V2 of negative busbar by checkout gear, subsequently, by judging that acquisition device judges the voltage rise producing due to circulation effect of positive bus-bar or negative busbar according to following three kinds of situations:
If V1 > Vset & V1 > is V2, voltage rise Veer=Vset-V1; If V2 > Vset & V2 > is V1, Veer=V2-Vset; If V1 < Vset & V2 < is Vset, Veer=0.
By the first loop current acquiring unit 2, calculate the loop current that causes this voltage to raise, i.e. the first circulation electric current I cir1 according to voltage rise.The function of the first loop current acquiring unit 2 can be realized by proportional controller, proportional and integral controller or proportional integral derivative controller.
By current sampling circuit 3, the circulation in inverter parallel system is sampled simultaneously, obtain the second loop current Icir2.
By counting circuit calculate the first circulation electric current I cir1 and the second loop current Icir2 electric current and, then by sharing control unit 4 using the electric current of the first circulation electric current I cir1 and the second loop current Icir2 and in inverter parallel system for the circulation of sharing control.
The circular current control method of the inverter parallel system that the embodiment of the present invention provides, device and inverter parallel system, accurate not for the circulation that uses current sampling circuit to obtain in prior art, cause the sharing control of carrying out according to this circulation obtaining cannot avoid the voltage of the positive and negative busbar in inverter parallel system to raise until the situation of overvoltage occurs, the present invention adopts the voltage rising situation of real-time measurement bus, and according to this rising situation calculate cause busbar voltage raise circulation, the electric current of the circulation obtaining by this circulation and current sampling circuit and carry out sharing control, when busbar voltage raises, in time it is controlled, effectively avoid the positive and negative busbar voltage causing due to circulation effect in inverter parallel system to raise until the situation of overvoltage occurs, improve the accuracy of circulation control.
Through the above description of the embodiments, those skilled in the art can be well understood to the mode that the present invention can add essential common hardware by software and realize, and can certainly pass through hardware, but in a lot of situation, the former is better execution mode.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium can read, as the floppy disk of computer, hard disk or CD etc., comprise that some instructions are in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) carry out the method described in each embodiment of the present invention.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, any be familiar with those skilled in the art the present invention disclose technical scope in; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should described be as the criterion with the protection range of claim.
Claims (9)
1. a circular current control method for inverter parallel system, is characterized in that, comprising:
Obtain the voltage rise that the positive bus-bar of inverter in inverter parallel system or the circulation due to described inverter parallel system of negative busbar cause, comprise: the overvoltage set-point voltage of setting positive bus-bar and negative busbar, if the voltage of described positive bus-bar or negative busbar is higher than described overvoltage set-point voltage, the voltage rise that the circulation due to described inverter parallel system that the voltage value that exceeded is positive bus-bar or negative busbar causes; Obtain the positive bus-bar of inverter and the voltage of negative busbar; If described positive bus-bar voltage is greater than described overvoltage set-point voltage, described positive bus-bar voltage is greater than described negative busbar voltage simultaneously, and obtaining voltage rise is the poor of described overvoltage set-point voltage and described positive bus-bar voltage; If described negative busbar voltage is greater than described overvoltage set-point voltage, described negative busbar voltage is greater than described positive bus-bar voltage simultaneously, and obtaining voltage rise is the poor of described negative busbar voltage and described overvoltage set-point voltage; If described positive bus-bar voltage and described negative busbar voltage are all less than described overvoltage set-point voltage, obtaining described voltage rise is zero;
Obtain the first loop current that causes described positive bus-bar or negative busbar voltage to raise according to described voltage rise;
By current sampling circuit, the circulation in inverter parallel system is sampled, obtain the second loop current;
Using the electric current of described the first loop current and described the second loop current and in inverter parallel system for the circulation of sharing control.
2. circular current control method according to claim 1, it is characterized in that, described the first loop current that causes described positive bus-bar or negative busbar voltage to raise according to described voltage rise acquisition comprises: calculate and obtain the first loop current according to described voltage rise passing ratio adjuster, proportional and integral controller or proportional integral derivative controller.
3. circular current control method according to claim 1, it is characterized in that, described using the electric current of described the first loop current and described the second loop current and in inverter parallel system the circulation for sharing control comprise: by counting circuit calculate described the first loop current and described the second loop current electric current and.
4. a circulation control device for inverter parallel system, is characterized in that, comprising:
Voltage rise acquiring unit, the voltage rise causing for obtaining the positive bus-bar of inverter parallel system inverter or the circulation due to described inverter parallel system of negative busbar, described voltage rise acquiring unit comprises: setting device, for setting the overvoltage set-point voltage of positive bus-bar and negative busbar, if the voltage of described positive bus-bar or negative busbar is higher than described overvoltage set-point voltage, the voltage rise that the circulation due to described inverter parallel system that the voltage value that exceeded is positive bus-bar or negative busbar causes; Checkout gear, for detection of the positive bus-bar of inverter and the voltage of negative busbar;
Judge acquisition device, if be greater than described overvoltage set-point voltage for described positive bus-bar voltage, described positive bus-bar voltage is greater than described negative busbar voltage simultaneously, and obtaining voltage rise is the poor of described overvoltage set-point voltage and described positive bus-bar voltage; If described negative busbar voltage is greater than described overvoltage set-point voltage, described negative busbar voltage is greater than described positive bus-bar voltage simultaneously, and obtaining voltage rise is the poor of described negative busbar voltage and described overvoltage set-point voltage; If described positive bus-bar voltage and described negative busbar voltage are all less than described overvoltage set-point voltage, obtaining described voltage rise is zero;
The first loop current acquiring unit, for obtaining the first loop current that causes described positive bus-bar or negative busbar voltage to raise according to described voltage rise;
Current sampling circuit, samples for the circulation to inverter parallel system, obtains the second loop current;
Sharing control unit, for using the electric current of described the first loop current and described the second loop current and as inverter parallel system the circulation for sharing control.
5. device according to claim 4, is characterized in that, described the first loop current acquiring unit comprises: proportional controller, proportional and integral controller or proportional integral derivative controller, and for calculating and obtain the first loop current according to described voltage rise.
6. device according to claim 4, is characterized in that, described sharing control unit comprises: counting circuit, for calculate described the first loop current and described the second loop current electric current and.
7. an inverter parallel system, is characterized in that, comprising: the circulation control device that the inverter of alternating current is provided and the circulation in inverter parallel system is controlled for load of multiple parallel connections, and described circulation control device comprises:
Voltage rise acquiring unit, the voltage rise causing for obtaining the positive bus-bar of inverter parallel system inverter or the circulation due to described inverter parallel system of negative busbar, described voltage rise acquiring unit comprises: setting device, for setting the overvoltage set-point voltage of positive bus-bar and negative busbar, if the voltage of described positive bus-bar or negative busbar is higher than described overvoltage set-point voltage, the voltage rise that the circulation due to described inverter parallel system that the voltage value that exceeded is positive bus-bar or negative busbar causes; Checkout gear, for detection of the positive bus-bar of inverter and the voltage of negative busbar; Judge acquisition device, if be greater than described overvoltage set-point voltage for described positive bus-bar voltage, described positive bus-bar voltage is greater than described negative busbar voltage simultaneously, and obtaining voltage rise is the poor of described overvoltage set-point voltage and described positive bus-bar voltage; If described negative busbar voltage is greater than described overvoltage set-point voltage, described negative busbar voltage is greater than described positive bus-bar voltage simultaneously, and obtaining voltage rise is the poor of described negative busbar voltage and described overvoltage set-point voltage; If described positive bus-bar voltage and described negative busbar voltage are all less than described overvoltage set-point voltage, obtaining described voltage rise is zero;
The first loop current acquiring unit, for obtaining the first loop current that causes described positive bus-bar or negative busbar voltage to raise according to described voltage rise;
Current sampling circuit, samples for the circulation to inverter parallel system, obtains the second loop current;
Sharing control unit, for using the electric current of described the first loop current and described the second loop current and as inverter parallel system the circulation for sharing control.
8. system according to claim 7, is characterized in that, described the first loop current acquiring unit comprises: proportional controller, proportional and integral controller or proportional integral derivative controller, and for calculating and obtain the first loop current according to described voltage rise.
9. system according to claim 7, is characterized in that, described sharing control unit comprises: counting circuit, for calculate described the first loop current and described the second loop current electric current and.
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| CN104218835B (en) * | 2013-06-05 | 2016-11-23 | 上海三菱电梯有限公司 | The circular current control method of parallel power converting means and device |
| CN105322768B (en) * | 2014-08-04 | 2018-01-09 | 上海三菱电梯有限公司 | The control device of parallel power transformation system |
| CN108712100B (en) * | 2018-06-21 | 2019-09-27 | 常熟瑞特电气股份有限公司 | A kind of power method for implanting preventing inverter zero load parallel connection direct voltage pump rise |
| CN111464001B (en) | 2019-01-18 | 2021-06-11 | 台达电子企业管理（上海）有限公司 | Method and system for reducing input circulating current of multiple non-isolated modules operating in parallel |
| CN112583262B (en) * | 2020-11-18 | 2022-03-11 | 国电南瑞科技股份有限公司 | Current-sharing control method, device and system suitable for bidirectional non-isolated staggered parallel direct current converter |
| CN117015926A (en) * | 2021-03-31 | 2023-11-07 | 华为数字能源技术有限公司 | Power supply system, inverter and method for controlling positive bus voltage and negative bus voltage of inverter |
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| CN101677220A (en) * | 2008-09-19 | 2010-03-24 | 力博特公司 | Circular current control method and device of inverter parallel system and inverter parallel system |
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