CN111953192A - High-power inverter power supply and control method thereof - Google Patents
High-power inverter power supply and control method thereof Download PDFInfo
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- CN111953192A CN111953192A CN202010800421.8A CN202010800421A CN111953192A CN 111953192 A CN111953192 A CN 111953192A CN 202010800421 A CN202010800421 A CN 202010800421A CN 111953192 A CN111953192 A CN 111953192A
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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
- H02M1/00—Details of apparatus for conversion
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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
- H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5375—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with special starting equipment
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Abstract
The invention provides a high-power inverter power supply and a control method thereof, wherein the inverter power supply comprises an input side transformer, an output side transformer, a rectifying unit, an inverting unit and an output filtering unit, a secondary winding of the input side transformer is connected with the input end of the rectifying unit, the output end of the rectifying unit and the input end of the inverting unit are connected with an energy storage unit, and the output end of the inverting unit is connected to the secondary winding of the output side transformer through the output filtering unit. The method of the invention is applied to the high-power inverter power supply. The invention can realize non-impact starting among various power electronic links, can not cause voltage and current impact among all links, inhibits the overshoot problem of control, and simultaneously controls the direction of impact current through the surge absorption during current surge to achieve the effect of impact inhibition.
Description
Technical Field
The invention relates to the technical field of inverter power supplies, in particular to a high-power inverter power supply and a control method applied to the inverter power supply.
Background
The high-power inverter power supply is a power electronic power supply device which is increasingly demanded by the industrial society at present. For example, in a 27.5/10kV railway purification power supply device, a 27.5/0.4kV railway AC/DC/AC power supply device used in the railway industry, a high-power uninterruptible power supply device used in an industrial power supply place and the like, in order to isolate the problems of voltage fluctuation and harmonic waves at the input side of a power supply, the stability of output voltage is realized through closed-loop control of power electronics.
However, in practical industrial applications, many more practical problems are usually faced, such as start-up problem when high-power electronic series-parallel connection is implemented, and inrush current problem on the load side.
The starting problem is a problem generally faced when the device is started, and the high voltage causes large impact during starting and the problem that each power electronic link faced during parallel connection cannot enter a steady state simultaneously.
In addition, the inrush current problem on the load side is a more severe problem, and the inrush current includes the transformer type excitation inrush current surge on the load side, and also includes the load current surge when the load suddenly changes and is suddenly switched in, and the inrush currents cause the current sharing problem or the insufficient impact resistance problem between the parallel links of the high-power inverter power supplies.
Disclosure of Invention
The invention mainly aims to provide a high-power inverter power supply which can realize non-impact starting among various power electronic links, and can control the direction of impact current through surge absorption control when the current surges so as to achieve the effect of impact inhibition.
The invention also aims to provide a control method of the high-power inverter power supply, which can realize non-impact starting among various power electronic links, and can control the direction of impact current through the surge absorption control during current surge so as to achieve the effect of impact suppression.
In order to achieve the above main object, the present invention provides a high power inverter power supply, which includes an input side transformer, an output side transformer, a rectifying unit, an inverting unit and an output filtering unit, wherein a secondary winding of the input side transformer is connected to an input end of the rectifying unit, an output end of the rectifying unit and an input end of the inverting unit are connected to an energy storage unit, and an output end of the inverting unit is connected to a secondary winding of the output side transformer through the output filtering unit.
In a further scheme, the rectification unit comprises a first rectification module and a second rectification module, the inversion unit comprises a first inversion module and a second inversion module, a first energy storage module is connected between the output end of the first rectification module and the input end of the first inversion module, and a second energy storage module is connected between the output end of the second rectification module and the input end of the second inversion module.
In a further aspect, the first rectifying module includes a first rectifier and a second rectifier, the first inverting module includes a first inverter and a second inverter, a first energy storage capacitor is connected between an output terminal of the first rectifier and an input terminal of the first inverter, a second energy storage capacitor is connected between an output terminal of the second rectifier and an input terminal of the second inverter, a first output terminal of the first inverter is connected to the winding a1 of the output-side transformer, a first output terminal of the second inverter is connected to the winding a1 of the output-side transformer, a second output terminal of the first inverter is connected to the winding B1 of the output-side transformer, a second output terminal of the second inverter is connected to the winding B1 of the output-side transformer, a third output terminal of the first inverter is connected to the winding C1 of the output-side transformer, the third output of the second inverter is connected to the winding C1 of the output side transformer.
In a further aspect, the second rectification module includes a third rectifier and a fourth rectifier, the second inversion module includes a third inverter and a fourth inverter, a third energy storage capacitor is connected between an output terminal of the third rectifier and an input terminal of the third inverter, a fourth energy storage capacitor is connected between an output terminal of the fourth rectifier and an input terminal of the fourth inverter, a first output terminal of the third inverter is connected to the winding a2 of the output-side transformer, a first output terminal of the fourth inverter is connected to the winding a2 of the output-side transformer, a second output terminal of the third inverter is connected to the winding B2 of the output-side transformer, a second output terminal of the fourth inverter is connected to the winding B2 of the output-side transformer, a third output terminal of the third inverter is connected to the winding C2 of the output-side transformer, the third output of the fourth inverter is connected to winding C2 of the output side transformer.
In a further aspect, the output filter unit includes a reactor, a filter capacitor, and a damping resistor, and the reactor, the filter capacitor, and the damping resistor are connected to the output end of each inverter and the secondary winding of the output side transformer.
In order to achieve another object, the present invention provides a control method for a high-power inverter power supply, where the high-power inverter power supply adopts the above-mentioned high-power inverter power supply, and the control method includes: step S1, after the first inversion module of the high-power inversion power supply enters a stable state, other power electronic links are prompted to directly enter the stable state from the near stable state; step S2, detecting the total load current output by the high-power inversion power supply, wherein the total load current comprises the current output by the inverters of the first inversion module and the second inversion module; step S3, when the load current inrush current occurs, the total load current output by the high-power inverter power supply is increased, and the modulation instruction of the inverter of the second inverter module is multiplied by (1-m%); step S4, when the voltage across the winding A1 tends to be larger than the voltage across the winding A2, the inrush current will flow through the winding A2 preferentially, and most of the inrush current is absorbed by the winding A2; and step S5, when the inrush current is reduced, the step S3 is cancelled, and the modulation instruction of the inverter of the second inverter module is recovered to be normal.
Further, step S1 specifically includes: step S11, outputting a first modulation command to control an output voltage of an inverter of the first inverter module; step S12, after the output voltage of the inverter of the first inversion module reaches the rated value, copying the first modulation instruction in the step S11, and controlling the output voltage of the inverter of the second inversion module to promote the high-power inversion power supply to enter a near steady state; step S13, calculating a second modulation command of the inverter of the second inversion module while assigning a value in the step S12; step S14, the delay T1 element starts timing; step S15, after the delay time T1 is reached, comparing the two modulation commands of step S12 and step S13, if the difference between the second modulation command and the first modulation command copied in step S12 is within n% of the first modulation command, releasing the command copy of step S12, and using the second modulation command to control the inverter of the second inverter module, that is, the second inverter module enters steady state control from near steady state.
Still further, in step S3, the empirical value of m% is less than or equal to 2%, where m% is the surge absorption proportionality coefficient.
Still further, in step S14, the delay time T1 is greater than 40 ms.
Further, in step S15, the empirical value of n% is less than 3%, where n% is the scaling factor of the state transition.
Therefore, the invention adopts the technical scheme, is applied to a high-power inverter power supply, can start the same type of power electronic links with electrical relation to a stable state at first during starting, and utilizes the characteristic that the electrical parameters of the similar power electronic links are similar to each other to ensure that other power electronic links directly enter the stable state from the near-stable state, thereby slowing down the starting impact problem and solving a series of problems in the starting process. Meanwhile, when the inrush current occurs at the load side, indirect impedance control is realized through direct voltage control of an internal link, so that the current direction is controllable.
In addition, the voltage change of the filtering link is aggravated by the sharp inrush current change, the inrush current problem of current is worsened, the voltage problem of the filtering link is softened by controllable current, and the control difficulty and the inrush current are also reduced. More importantly, the control idea is simple and convenient, good realizability is achieved, the control difficulty is low, the technical scheme is easy to achieve, and popularization and application are facilitated.
Drawings
Fig. 1 is a schematic circuit diagram of an embodiment of a high-power inverter according to the present invention.
The invention is further explained with reference to the drawings and the embodiments.
Detailed Description
An embodiment of a high-power inverter power supply comprises:
referring to fig. 1, the high-power inverter power supply of the present invention includes an input side transformer T1, an output side transformer T2, a rectifying unit, an inverting unit, and an output filter unit, wherein a secondary winding of the input side transformer T1 is connected to an input end of the rectifying unit, an output end of the rectifying unit and an input end of the inverting unit are connected to an energy storage unit, and an output end of the inverting unit is connected to a secondary winding of the output side transformer T2 through the output filter unit. A fuse is connected between the secondary winding of the input side transformer T1 and the input end of the rectifying unit.
In this embodiment, the rectifying unit includes a first rectifying module and a second rectifying module, the inverting unit includes a first inverting module and a second inverting module, a first energy storage module is connected between an output end of the first rectifying module and an input end of the first inverting module, and a second energy storage module is connected between an output end of the second rectifying module and an input end of the second inverting module.
Specifically, the first rectifying module includes a first rectifier Z1 and a second rectifier Z2, the first inverting module includes a first inverter N1 and a second inverter N2, a first energy storage capacitor C1 is connected between the output end of the first rectifier Z1 and the input end of the first inverter N1, a second energy storage capacitor C2 is connected between the output end of the second rectifier Z2 and the input end of the second inverter N2, a first output end of the first inverter N1 is connected to a winding a1 of an output-side transformer T2, a first output end of the second inverter N2 is connected to a winding a1 of the output-side transformer T2, a second output end of the first inverter N1 is connected to a winding B1 of the output-side transformer T2, a second output end of the second inverter N2 is connected to a winding B1 of the output-side transformer T2, a third output end of the first inverter N1 is connected to a winding C1 of the output-side transformer T2, a third output terminal of the second inverter N2 is connected to the winding C1 of the output side transformer T2.
Specifically, the second rectification module includes a third rectifier Z3 and a fourth rectifier Z4, the second inversion module includes a third inverter N3 and a fourth inverter N4, a third energy storage capacitor C3 is connected between the output terminal of the third rectifier Z3 and the input terminal of the third inverter N3, a fourth energy storage capacitor C4 is connected between the output terminal of the fourth rectifier Z4 and the input terminal of the fourth inverter N4, a first output terminal of the third inverter N3 is connected to the winding a2 of the output-side transformer T2, a first output terminal of the fourth inverter N4 is connected to the winding a2 of the output-side transformer T2, a second output terminal of the third inverter N3 is connected to the winding B2 of the output-side transformer T2, a second output terminal of the fourth inverter N4 is connected to the winding B2 of the output-side transformer T2, a third output terminal of the third inverter N3 is connected to the winding C2 of the output-side transformer T2, a third output terminal of the fourth inverter N4 is connected to the winding C2 of the output side transformer T2.
In the present embodiment, the output filter unit includes a reactor L, a filter capacitor Cf, and a damping resistor Rf, and the reactor L, the filter capacitor Cf, and the damping resistor Rf are connected to the output end of each inverter and the secondary winding of the output side transformer T2.
In the present embodiment, a first fuse F1 is connected between the first rectifier Z1 and the secondary winding of the input-side transformer T1, a second fuse F2 is connected between the second rectifier and the secondary winding of the input-side transformer T1, a third fuse F3 is connected between the third rectifier and the secondary winding of the input-side transformer T1, and a fourth fuse F4 is connected between the fourth rectifier and the secondary winding of the input-side transformer T1.
Specifically, the high-power inverter power supply mainly comprises an input side transformer T1, a rectifying unit, an energy storage unit, an inverter unit, a reactor L, a filter capacitor Cf, a damping resistor Rf and an output side transformer T2, wherein a secondary winding of the input side transformer T1 is connected with a rectifier, a direct current side of the rectifier is connected with the energy storage capacitor in parallel, two ends of the energy storage capacitor are connected with a direct current side of an inverter in parallel, and an alternating current output side of the inverter is connected with a secondary winding of the output side transformer T2 after being filtered by the filter reactor L, the filter capacitor Cf and the damping resistor Rf in sequence.
The outputs of the inverters are connected in series, that is, the ac filter outputs of the inverters are b1, b2, and b3, and b1 of the two inverters (such as the first inverter and the second inverter) are connected to two ends of a winding a1 of the output side transformer T2. Similarly, windings B1, C1, a2, B2, C2, etc. are connected to winding a1 in the same manner.
The embodiment of a control method of a high-power inverter power supply comprises the following steps:
a control method of a high-power inverter power supply is applied to the high-power inverter power supply, and comprises the following steps:
and step S1, after the first inversion module of the high-power inversion power supply enters a stable state, prompting other power electronic links to directly enter the stable state from the near stable state.
And step S2, detecting the total load current output by the high-power inverter power supply, wherein the total load current comprises the current output by the inverters of the first inverter module and the second inverter module.
Step S3, when the load current inrush current occurs, the total load current output by the high-power inverter increases, and the modulation command of the inverter of the second inverter module is multiplied by (1-m%). In step S3, the empirical value of m% is less than or equal to 2%, where m% is the inrush current absorption scaling factor, which indicates the proportion of the command decrease when the second inverter module absorbs the inrush current.
In step S4, when the voltage across winding a1 tends to be greater than the voltage across winding a2, the inrush current will flow preferentially through winding a2 and most of the inrush current will be absorbed by winding a 2.
In step S5, when the inrush current is decreased, the step S3 is canceled, and the modulation command for the inverter of the second inverter module is restored to normal.
The empirical value in this example is an empirical value obtained by debugging in a plurality of tests.
In this embodiment, step S1 specifically includes:
step S11 is to output a first modulation command to control the output voltage of the inverter of the first inverter module.
And step S12, after the output voltage of the inverter of the first inversion module reaches the rated value, copying the first modulation command in the step S11, and controlling the output voltage of the inverter of the second inversion module to enable the high-power inversion power supply to enter a near-steady state.
And step S13, calculating a second modulation command of the inverter of the second inversion module while assigning a value in step S12.
In step S14, the delay T1 element starts timing. In step S14, the empirical value of the delay time T1 is greater than 40 ms.
And step S15, comparing the two modulation commands of the step S12 and the step S13 after the delay time T1 is reached, if the difference between the second modulation command and the first modulation command copied in the step S12 is within the range of n% of the first modulation command, releasing the command copy of the step S12, and controlling the inverter of the second inverter module by using the second modulation command, namely, the second inverter module enters the steady state control from the near steady state. In step S15, the empirical value of n% is less than 3%, where n% is a state transition scaling factor, i.e., the ratio of the difference between the second inverter module command calculated value and the copied first inverter module command value to the first inverter module command calculated value, and whether to initiate a transition from near steady state to steady state is determined by changing the scaling factor.
In practical applications, the control method of the present embodiment includes a near steady-state start method and an inrush current absorption control method, where the near steady-state start method includes step S1: after the first inversion module of the high-power inversion power supply enters a stable state, other power electronic links are promoted to directly enter the stable state from a near stable state, and the specific control steps are as follows:
first, a first step is performed to control the inverters N1, N2 to which the windings a1, B1, C1 are connected, and to control the PWM signal commands of the inverters to be output to the rated values in a voltage decreasing manner.
Then, the second step is executed, after the rated value command is reached in the last step, the modulation command of the last step is copied to the inverters N3 and N4 connected with the windings A2, B2 and C2 in the same command cycle command. Due to the extremely similar voltages at the two ends of the windings A1 and A2, the windings B1 and B2 and the windings C1 and C2, the high-power inverter enters a near steady state.
Next, a third step is executed, in which, at the same time as the assignment of the previous step, the modulation commands of the inverters connected to the windings a2, B2, C2 are calculated.
Then, the fourth step is executed, and the delay T1 element starts timing.
Then, the fifth step is executed, the two commands of the third step and the second step are compared, if the difference between the modulation command calculated in the third step and the modulation command copied in the second step is within N% of the copied value of the second step, the copying of the second step is released, the inverters N3 and N4 connected with the windings A2, B2 and C2 are controlled by the calculated value of the third step, and all the inverters enter a steady state in a near steady state.
The inrush current absorption control method of the present embodiment includes the above steps S2, S3, S4, and S5, and specifically includes the following steps:
first, the total load current output by the high-power inverter power supply is detected, wherein the total load current comprises the output current of the inverter connected with the windings A1, B1 and C1 of the output side transformer T2 and the output current of the inverter connected with the windings A2, B2 and C2 of the output side transformer T2.
In the normal operation process, the inverters of the first inverter module and the second inverter module are in a natural current sharing state under voltage balance, namely the inverters N1, N2, N3 and N4 connected with windings of A1, B1, C1, A2, B2 and C2 are in a natural current sharing state under voltage balance.
When the load inrush current occurs, the total load current output by the high-power inverter increases, and the modulation commands of the inverters N3 and N4 connected to the windings A2, B2 and C2 are multiplied by (1-m%).
At this time, the voltage across the winding a1 tends to be larger than the voltage across the winding a2, and since the winding a1 and the winding a2 are in a magnetic parallel state, the voltages across the winding a1 and the winding a2 are forced to be equal, the equivalent internal resistance of the winding a2 and the connected inverter will be smaller than that of the winding a1 and the connected inverter, the current will preferentially flow through the winding a2, and the most of the inrush current will be absorbed by the winding a 2.
When the inrush current is reduced, the modulation commands to the inverters N3 and N4 connected to the windings a2, B2 and C2 are released, that is, the commands are returned to normal.
Therefore, the high-power inverter power supply and the control method thereof are applied to the field of inverter power supplies, and the problem of impact caused by inconsistent starting states when a plurality of power electronic links exist in the same device is solved. Meanwhile, in high-power application, when the inrush current occurs at the load side, the direction of the inrush current is controllable, the sharp change of the voltage of the filtering link is softened, and the inrush current problem is reduced to a certain extent besides the current control method. In addition, the control method has the advantages of low control difficulty and easy realization of the technical scheme, and is favorable for popularization and application.
Therefore, the invention adopts the technical scheme, is applied to a high-power inverter power supply, can start the same type of power electronic links with electrical relation to a stable state at first during starting, and utilizes the characteristic that the electrical parameters of the similar power electronic links are similar to each other to ensure that other power electronic links directly enter the stable state from the near stability, thereby relieving the starting impact problem and solving a series of problems faced by the starting process. Meanwhile, when the inrush current occurs at the load side, indirect impedance control is realized through direct voltage control of an internal link, so that the current direction is controllable.
In addition, the voltage change of the filtering link is aggravated by the sharp inrush current change, the inrush current problem of current is worsened, the voltage problem of the filtering link is softened by controllable current, and the control difficulty and the inrush current are also reduced. More importantly, the control idea is simple and convenient, good realizability is achieved, the control difficulty is low, the technical scheme is easy to achieve, and popularization and application are facilitated.
It should be noted that the above-mentioned description is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, without departing from the principle of the invention, several improvements and decorations can be made, such as improving the device current-carrying capacity of the inverter connected with the windings A2, B2 and C2, realizing the impact-resistant control with larger capacity, such as 2-phase or 3-phase changes to the input and output sides and corresponding changes in the number of rectified and inverted phases, such as the change of application environment, the application in the field of the inversion of uninterrupted power supply, railway purification power supply, AC/DC/AC power supply and the like, such as the change of the winding connection of the input/output transformer, such as the change of the number of windings a1, a2, B1, B2, C1, C2 and their corresponding connected rectifying and inverting links, etc., which also fall within the protection scope of the present invention.
Claims (10)
1. A high-power inverter power supply, comprising:
the transformer comprises an input side transformer, an output side transformer, a rectifying unit, an inverting unit and an output filtering unit, wherein a secondary winding of the input side transformer is connected with an input end of the rectifying unit, an output end of the rectifying unit and an input end of the inverting unit are connected with an energy storage unit, and an output end of the inverting unit is connected to a secondary winding of the output side transformer through the output filtering unit.
2. The high power inverter power supply according to claim 1, wherein:
the rectification unit comprises a first rectification module and a second rectification module, the inversion unit comprises a first inversion module and a second inversion module, a first energy storage module is connected between the output end of the first rectification module and the input end of the first inversion module, and a second energy storage module is connected between the output end of the second rectification module and the input end of the second inversion module.
3. The high power inverter power supply according to claim 2, wherein:
the first rectifying module comprises a first rectifier and a second rectifier, the first inverting module comprises a first inverter and a second inverter, a first energy storage capacitor is connected between the output end of the first rectifier and the input end of the first inverter, a second energy storage capacitor is connected between the output end of the second rectifier and the input end of the second inverter, the first output end of the first inverter is connected to the winding A1 of the output side transformer, the first output end of the second inverter is connected to the winding A1 of the output side transformer, the second output end of the first inverter is connected to the winding B1 of the output side transformer, the second output end of the second inverter is connected to the winding B1 of the output side transformer, and the third output end of the first inverter is connected to the winding C1 of the output side transformer, the third output of the second inverter is connected to the winding C1 of the output side transformer.
4. The high power inverter power supply according to claim 3, wherein:
the second rectifying module comprises a third rectifier and a fourth rectifier, the second inverting module comprises a third inverter and a fourth inverter, a third energy storage capacitor is connected between the output end of the third rectifier and the input end of the third inverter, a fourth energy storage capacitor is connected between the output end of the fourth rectifier and the input end of the fourth inverter, the first output end of the third inverter is connected to the winding A2 of the output-side transformer, the first output end of the fourth inverter is connected to the winding A2 of the output-side transformer, the second output end of the third inverter is connected to the winding B2 of the output-side transformer, the second output end of the fourth inverter is connected to the winding B2 of the output-side transformer, and the third output end of the third inverter is connected to the winding C2 of the output-side transformer, a third output terminal of the fourth inverter is connected to a winding C2 of the output side transformer.
5. The high power inverter power supply according to claim 4, wherein:
the output filter unit comprises a reactor, a filter capacitor and a damping resistor, and the output end of each inverter and the secondary winding of the output side transformer are connected with the reactor, the filter capacitor and the damping resistor.
6. A method for controlling a high power inverter, wherein the high power inverter is the one according to any one of claims 1 to 5, the method comprising:
step S1, after the first inversion module of the high-power inversion power supply enters a stable state, other power electronic links are prompted to directly enter the stable state from the near stable state;
step S2, detecting the total load current output by the high-power inverter power supply, wherein the total load current comprises the current output by the inverters of the first inverter module and the second inverter module;
step S3, when the load current inrush current occurs, the total load current output by the high-power inverter power supply is increased, and the modulation instruction of the inverter of the second inverter module is multiplied by (1-m%);
step S4, when the voltage across the winding A1 tends to be larger than the voltage across the winding A2, the inrush current will flow through the winding A2 preferentially, and most of the inrush current is absorbed by the winding A2;
and step S5, when the inrush current is reduced, the step S3 is cancelled, and the modulation command of the inverter of the second inverter module is recovered to be normal.
7. The method according to claim 6, wherein the step S1 specifically includes:
step S11, outputting a first modulation command to control an output voltage of an inverter of the first inverter module;
step S12, after the output voltage of the inverter of the first inversion module reaches the rated value, copying the first modulation instruction in the step S11, and controlling the output voltage of the inverter of the second inversion module to enable the high-power inversion power supply to enter a near-steady state;
step S13, calculating a second modulation command of the inverter of the second inversion module while assigning a value in the step S12;
step S14, the delay T1 element starts timing;
step S15, after the delay time T1 is reached, comparing the two modulation commands of step S12 and step S13, if the difference between the second modulation command and the first modulation command copied in step S12 is within n% of the first modulation command, releasing the command copy of step S12, and using the second modulation command to control the inverter of the second inverter module, that is, the second inverter module enters the steady state control from the near steady state.
8. The method of claim 6, wherein:
in step S3, the empirical value of m% is less than or equal to 2%, where m% is the surge absorption proportionality coefficient.
9. The method of claim 7, wherein:
in step S14, the empirical value of the delay time T1 is greater than 40 ms.
10. The method of claim 7, wherein:
in step S15, the empirical value of n% is less than 3%, where n% is the state transition scaling factor.
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| JP2000125568A (en) * | 1998-10-16 | 2000-04-28 | Mitsubishi Heavy Ind Ltd | Inverter power supply device |
| JP4068435B2 (en) * | 2002-11-18 | 2008-03-26 | 東芝三菱電機産業システム株式会社 | Synchronous motor control system |
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