CN116599328A - Module, system and method for parallel current sharing real-time adjustment of thyristor power bridge arm - Google Patents
Module, system and method for parallel current sharing real-time adjustment of thyristor power bridge arm Download PDFInfo
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Classifications
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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
- H02M1/06—Circuits specially adapted for rendering non-conductive gas discharge tubes or equivalent semiconductor devices, e.g. thyratrons, thyristors
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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
- H02M1/0003—Details of control, feedback or regulation circuits
Abstract
The application relates to a thyristor power supply current sharing adjustment technology, and discloses a module, a system and a method for parallel current sharing real-time adjustment of a thyristor power supply bridge arm. The analog signals on the bridge arm of each thyristor power supply are collected in real time, and the collected analog signals are converted into corresponding digital signals; wherein the analog signals include current signals and voltage signals; calculating according to the converted digital signals to obtain trigger angle values corresponding to thyristors on the bridge arm of each thyristor power supply; generating a trigger pulse corresponding to each trigger angle value; and correspondingly adjusting the current of the thyristor according to each trigger pulse, realizing real-time on-line adjustment of the current sharing performance of the power bridge arm of the thyristor, and effectively improving and enhancing the efficiency and accuracy of off-line current sharing adjustment.
Description
Technical Field
The application relates to a thyristor power supply current sharing adjustment technology, in particular to a module, a system and a method for parallel current sharing real-time adjustment of a thyristor power supply bridge arm.
Background
Along with the increasing power demand of the industrialized development on the direct-current power supply, the output current of the power supply is from tens of kA to hundreds of kA, and in order to meet the demands of simple structure, high power output and high cost performance, a plurality of thyristors are mostly adopted in the design of the high-current rectifying power supply to meet the requirement of the industrial field on high current. When a plurality of thyristors are connected in parallel, current distribution among parallel thyristor branches is uneven due to distribution parameters generated by difference of opening time and forward voltage drop among the parallel branches, branch impedance and the like, and then devices of part of the parallel branches are operated under too high current load for a long time in the operation process, and the corresponding other parallel branches do not fully utilize the device capacity, so that stable operation characteristics of the system are influenced, and unsafe is brought to long-term operation of equipment.
Among the factors influencing the current sharing of the parallel branches of the thyristor bridge arm, the impedance of the branch plays a main role; it is difficult to design multiple parallel branches to be identical from a power supply configuration, resulting in differences between the branch impedances. The traditional parallel current sharing of the bridge arm of the thyristor power supply adopts a mode of adding a resistance sheet in the parallel branch to adjust the impedance of the parallel branch, so that the current sharing performance of a plurality of parallel branches of the bridge arm is improved. The mode has the problems that firstly, the operation is very inconvenient, the power supply main loop needs to be disassembled, and the power supply main loop is continuously replaced through experiments, so that the efficiency is low; secondly, the contact resistance and resistivity of the resistor sheet change with time, which results in a significant reduction in the original effect.
In view of this, the present application has been made.
Disclosure of Invention
The technical problems to be solved by the application are as follows: at present, a manual off-line adjustment mode is adopted for the current sharing adjustment of the multi-parallel bridge arm thyristors, and the adjustment mode is low in efficiency and poor in stability. The module, the system and the method for adjusting the parallel current sharing of the thyristor power bridge arm in real time can adjust the current sharing performance of the thyristor power bridge arm on line in real time, and effectively improve and improve the efficiency and the accuracy of off-line current sharing adjustment.
The application is realized by the following technical scheme:
on the one hand, a module for parallel current sharing real-time adjustment of thyristor power bridge arms is provided, which comprises an AD sampling unit, a digital processing unit and a control unit, wherein the AD sampling unit is used for collecting analog signals output by each thyristor power bridge arm branch in real time, converting all the collected analog signals into corresponding digital signals, and outputting all the converted digital signals to the digital processing unit; wherein the analog signals include current signals and voltage signals; the digital processing unit is used for calculating the trigger angle value corresponding to the thyristor on each thyristor power bridge arm according to the received digital signals, and outputting all the calculated trigger angle values to the trigger pulse processing unit; the trigger pulse processing unit is used for generating trigger pulses corresponding to each trigger angle value and outputting all the generated trigger pulses to the driving final stage plate; and the final stage plate is driven and used for correspondingly adjusting the current of the thyristor according to each received trigger pulse to finish parallel current sharing of the power bridge arm of the thyristor.
Further, the digital processing unit comprises an instantaneous impedance calculation unit for calculating the instantaneous impedance value of the thyristor on the bridge arm of the thyristor power supply according to the current signal and the voltage signal; the trigger angle calculating unit is used for obtaining the trigger angle value of the thyristor on the bridge arm of the thyristor power supply according to the calculated instantaneous impedance value; and the circulation control unit is used for controlling the instantaneous impedance calculation unit and the trigger angle calculation unit to execute corresponding calculation processing tasks according to a preset control circulation period.
Further, the triggering angle calculation unit comprises a current reference signal generation subunit, which is used for selecting the smallest current signal from all collected current signals, and taking the selected current signal as a current reference signal for parallel current sharing adjustment of a thyristor power bridge arm; the voltage deviation calculating subunit is used for calculating the current deviation of each thyristor power supply bridge arm branch according to the current reference signal and the current signal of each thyristor power supply bridge arm branch and obtaining corresponding voltage deviation according to the current deviation of each thyristor power supply bridge arm branch; the control angle value calculation subunit is used for calculating and obtaining the control angle value of each thyristor power supply bridge arm branch according to the voltage deviation of each thyristor power supply bridge arm branch; the signal detection subunit is used for judging whether a new trigger angle control signal for controlling the thyristor is received or not; if a new trigger angle signal is received, a driving signal is sent to a trigger angle value calculating subunit; if no new trigger angle signal is received, continuing waiting; and the trigger angle value calculating subunit is used for calculating the trigger angle value of each thyristor power bridge arm according to the received new trigger angle signal and the control angle value of each thyristor power bridge arm branch.
Further, the digital processing unit is a DSP processing unit.
On the other hand, a system for regulating parallel current sharing of a thyristor power supply bridge arm in real time is provided, and the system comprises a plurality of thyristor power supply bridge arm branches and the modules; the signal output end of each thyristor power supply bridge arm branch is connected with the signal input end of the AD sampling unit.
Further, the thyristor power supply bridge arm branch comprises a thyristor, a Hall voltage sensor and an open Hall current sensor; the thyristor is connected in series with the open-type Hall current sensor, the Hall voltage sensor is connected to two ends of the thyristor through a cable, and the Hall voltage sensor and the open-type Hall current sensor are connected with the AD sampling unit through shielding twisted pair wires.
Further, the thyristor power bridge arm branch also comprises a fast fuse, and the fast fuse is connected in series between the thyristor and the open-type Hall current sensor.
In still another aspect, a method for parallel current sharing real-time adjustment of thyristor power bridge arm is provided, which includes the following steps:
acquiring analog signals on each thyristor power bridge arm in real time, and converting the acquired analog signals into corresponding digital signals; wherein the analog signals include current signals and voltage signals;
calculating according to the converted digital signals to obtain trigger angle values corresponding to thyristors on the bridge arm of each thyristor power supply;
calculating and obtaining a trigger angle value corresponding to the thyristor on each thyristor power bridge arm according to the received digital signals;
and correspondingly adjusting the current of the thyristor according to each received trigger pulse to finish parallel current sharing of the power bridge arm of the thyristor.
Further, the method for acquiring the trigger angle value comprises the following steps: s1: calculating to obtain an instantaneous impedance value of each thyristor power supply bridge arm branch; s2: selecting the smallest current signal from all collected current signals, and taking the selected current signal as a current reference signal for parallel current sharing adjustment of a thyristor power bridge arm; s3: according to the current reference signal and the current signal of each thyristor power supply bridge arm branch, calculating the current deviation of each thyristor power supply bridge arm branch, and obtaining the corresponding voltage deviation according to the current deviation of each thyristor power supply bridge arm branch; s4: calculating according to the voltage deviation of each thyristor power supply bridge arm branch to obtain a control angle value of each thyristor power supply bridge arm branch; s5: judging whether a new trigger angle control signal for controlling the thyristor is received or not; if a new trigger angle signal is received, S6 is executed; if no new trigger angle signal is received, continuing waiting; s6: and calculating the trigger angle value of each thyristor power bridge arm according to the received new trigger angle signal and the control angle value of each thyristor power bridge arm branch.
Further, in S1, the calculation formula of the instantaneous impedance value isThe method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>Representing the instantaneous impedance +.>Representing a voltage signal>Represents a current signal, n represents a thyristor power supply bridge arm branchThe number of ways;
s4, the calculation formula of the control angle value is as followsThe method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>The control angle is indicated as such,U d representing the dc output voltage of a three-phase thyristor bridge converter,U 2 representing the ac input voltage of a three-phase thyristor bridge converter.
Compared with the prior art, the application has the following advantages and beneficial effects: according to the different impedance of each thyristor power supply bridge arm branch, calculating the corresponding trigger angle of each parallel thyristor branch under the condition of bridge arm current sharing according to the relation of voltage, current and impedance; finally, the real-time adjustment of the current sharing performance of the thyristor power bridge arm is realized, and the efficiency and the accuracy of off-line current sharing adjustment are effectively improved and improved. Compared with a manual off-line adjustment mode, the real-time on-line adjustment mode provided by the application can adjust the bridge arm current sharing on line in real time according to the actual running state in the power running, thereby improving the efficiency, realizing the real-time adjustment of current sharing and avoiding the difficulty brought to current sharing adjustment when the power is stopped and the parameters of the main circuit of the power are changed.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present application, the drawings that are needed in the examples will be briefly described below, it being understood that the following drawings only illustrate some examples of the present application and therefore should not be considered as limiting the scope, and that other related drawings may be obtained from these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a thyristor power bridge arm parallel current sharing real-time regulation system provided in embodiment 1 of the present application;
fig. 2 is a schematic overall flow chart of a real-time parallel current sharing adjustment method for a thyristor power bridge arm provided in embodiment 2 of the present application;
fig. 3 is a flowchart of a method for acquiring a trigger angle value according to embodiment 2 of the present application.
In the drawings, the reference numerals and corresponding part names:
the device comprises a 1-AD sampling unit, a 2-digital processing unit, a 3-trigger pulse processing unit, a 4-drive final stage board, a 5-thyristor power supply bridge arm branch, a 51-thyristor, a 52-Hall voltage sensor, a 53-opening Hall current sensor and a 54-fast fuse.
Description of the embodiments
For the purpose of making apparent the objects, technical solutions and advantages of the present application, the present application will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present application and the descriptions thereof are for illustrating the present application only and are not to be construed as limiting the present application.
Example 1
Aiming at the problems of low efficiency and poor stability of the existing manual off-line adjustment mode for adjusting the current sharing of the thyristors of the multiple parallel bridge arms, the embodiment provides a system for adjusting the parallel current sharing of the power arms of the thyristors in real time, which is shown in figure 1, and is divided into a thyristor power arm parallel current sharing real-time adjustment module part and a thyristor current arm part. The thyristor power bridge arm parallel current sharing real-time adjusting module consists of an AD sampling unit 1, a digital processing unit 2, a trigger pulse processing unit 3 and a driving final board 4, and the thyristor current bridge arm consists of a plurality of thyristor power bridge arm branches 5 which are connected in parallel.
Firstly, the AD sampling unit 1 collects current signals and voltage signals output by each thyristor power bridge arm branch 5 in real time, and outputs all collected current signals and voltage signals to the digital processing unit 2 after quantization coding. Then, the digital processing unit 2 calculates an instantaneous impedance value corresponding to the thyristor 51 on each thyristor power bridge arm branch 5 according to the received current signal and the received voltage signal, derives a trigger angle value corresponding to the thyristor 51 on each thyristor power bridge arm branch 5 according to the relation among the current, the voltage and the instantaneous impedance on each thyristor power bridge arm branch 5, and finally outputs the value to the trigger pulse processing unit 3. Next, the trigger pulse processing unit 3 generates a corresponding trigger pulse according to the trigger angle value of each thyristor power bridge arm branch 5, and outputs all the generated trigger pulses to the driving final stage board 4. Finally, the final stage board 4 is driven to amplify the power of the input trigger pulse signal and output the amplified trigger pulse signal to the corresponding driving stage of the thyristor 51, so that parallel current sharing adjustment of the thyristor power bridge arm is realized.
The composition of the digital processing unit 2 and its working principle, as well as the results of the individual thyristor power bridge arm branches 5, are explained in detail below.
1. Digital processing unit
The digital processing unit 2 includes an instantaneous impedance calculation unit, a trigger angle calculation unit, and a cycle control unit.
(1) Instantaneous impedance calculation unit
The instantaneous impedance calculating unit is used for calculating the instantaneous impedance value of the thyristor 51 on the thyristor power bridge arm branch 5 according to the current signal and the voltage signal.
(2) Trigger angle calculation unit
The trigger angle calculating unit is used for obtaining the trigger angle value of the thyristor 51 on the thyristor power bridge arm branch 5 according to the calculated instantaneous impedance value.
Specifically, the trigger angle calculating unit includes a current reference signal generating subunit, a voltage deviation calculating subunit, a control angle value calculating subunit, a signal detecting subunit, and a trigger angle value calculating subunit. The current reference signal generation subunit is used for selecting the smallest current signal from all collected current signals, and taking the selected current signal as a current reference signal for parallel current sharing adjustment of a thyristor power bridge arm; the voltage deviation calculating subunit is used for calculating the current deviation of each thyristor power supply bridge arm branch 5 according to the current reference signal and the current signal of each thyristor power supply bridge arm branch 5, and obtaining the corresponding voltage deviation according to the current deviation of each thyristor power supply bridge arm branch 5; the control angle value calculation subunit is used for calculating and obtaining the control angle value of each thyristor power supply bridge arm branch 5 according to the voltage deviation of each thyristor power supply bridge arm branch 5; the signal detection subunit is configured to determine whether a new trigger angle control signal for controlling the thyristor 51 is received; if a new trigger angle signal is received, a driving signal is sent to a trigger angle value calculating subunit; if no new trigger angle signal is received, continuing waiting; the trigger angle value calculating subunit is configured to calculate a trigger angle value of each thyristor power bridge arm according to the received new trigger angle signal and the control angle value of each thyristor power bridge arm branch 5.
(3) Circulation control unit
The circulation control unit is used for controlling the instantaneous impedance calculation unit and the trigger angle calculation unit to execute corresponding calculation processing tasks according to a preset control circulation period. In this embodiment, the preset control cycle period is 200us.
2. Thyristor power bridge arm branch
The thyristor power bridge arm branch 5 consists of a thyristor 51, a Hall voltage sensor 52, an open Hall current sensor 53 and a fast fuse 54. The hall voltage sensor 52 is used for measuring terminal voltages of the thyristor 51 and the fast fuse 54 in real time, the open hall current sensor 53 is used for measuring currents of the thyristor 51 and the fast fuse 54 in real time, and the hall current sensor and the open hall current sensor 53 output measured current signals and voltage signals to the AD sampling unit 1 through a shielded twisted pair.
In summary, as shown in the drawing, in the system for real-time adjustment of parallel current sharing of a thyristor power bridge arm provided in this embodiment, according to different impedance of each parallel branch, a trigger angle corresponding to each parallel thyristor branch under the condition of bridge arm current sharing is calculated according to the relationship between voltage, current and impedance; finally, the real-time adjustment of the current sharing performance of the thyristor power bridge arm is realized, and the efficiency and the accuracy of off-line current sharing adjustment are effectively improved and improved. It should be noted that the data processing unit may be a DPS processor, but is not limited to a DSP processor.
Example 2
The embodiment provides a method for regulating parallel current sharing of a thyristor power bridge arm in real time, which is based on the system of the embodiment 1, and the whole real-time flow is shown in fig. 2, and comprises the following steps:
step 1: and (3) powering up the system, and starting and executing the thyristor power supply bridge arm parallel current sharing real-time regulating module.
Step 2: judging whether the system can operate, if so, executing the step 3; if the system is in the test running state or the system debugging state, the system is not put into operation and continues to wait.
Step 3: the AD sampling unit is used for collecting the voltage signals and the current signals output by each thyristor power bridge arm branch in real time at the sampling rate of 20kHz, and the collected current signals and the collected voltage signals are output to the digital processing unit after being quantized and encoded.
Step 4: and calculating and obtaining a trigger angle value corresponding to the thyristor on each thyristor power bridge arm according to the received current signal and voltage signal by the digital processing unit.
Step 5: and generating corresponding trigger pulses according to the trigger angle values of the thyristors on the power bridge arm of each thyristor.
Step 6: and correspondingly adjusting the current of the thyristor according to each trigger pulse to finish parallel current sharing of the power bridge arm of the thyristor.
As shown in fig. 3, in step 4, the method for acquiring the trigger angle value is as follows:
s1: and calculating to obtain a corresponding instantaneous impedance value according to the current signal and the voltage signal of each thyristor power bridge arm branch. The calculation formula of the instantaneous impedance value is(1) The method comprises the steps of carrying out a first treatment on the surface of the Wherein Z is n Representing instantaneous impedance, U n Representing voltage signals, I n Representing the current signal, n represents the number of legs of the thyristor power supply leg, n=1, 2, …, n'.
S2: from the acquired current signalSelecting the smallest one of min { I } n The selected current signal min { I } n Thyristor asThe power bridge arm is connected in parallel with a current reference signal for current sharing adjustment.
S3: using current reference signals and current signals of each thyristor power bridge arm branchDifference is made, and the current deviation of each thyristor power supply bridge arm branch is calculated>The current deviation of each thyristor power supply bridge arm branch is +.>Substituting the voltage deviation into the formula (1) to calculate and obtain the voltage deviation +/corresponding to each thyristor power supply bridge arm branch>。
S4: the voltage deviation of each thyristor power supply bridge arm branch is calculatedSubstitution formula->(2) Calculating to obtain the control angle value of each thyristor power bridge arm branch,U d representing the dc output voltage of a three-phase thyristor bridge converter,U 2 representing the ac input voltage of a three-phase thyristor bridge converter.
The calculation formula of the control angle value is(2) It should be noted that, the formula (2) can be derived from the ac-dc relationship of the three-phase thyristor bridge converter.
S5: judging whether a new trigger angle control signal for controlling the thyristor is received or not; if a new trigger angle signal is received, S6 is executed; if no new trigger angle signal is received, wait is continued.
S6: and calculating the trigger angle value of each thyristor power bridge arm according to the received new trigger angle signal and the control angle value of each thyristor power bridge arm branch.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the application, and is not meant to limit the scope of the application, but to limit the application to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the application are intended to be included within the scope of the application.
Claims (10)
1. A module for parallel current sharing real-time adjustment of thyristor power bridge arm is characterized by comprising
The AD sampling unit (1) is used for collecting analog signals output by each thyristor power bridge arm branch in real time, converting all collected analog signals into corresponding digital signals, and outputting all converted digital signals to the digital processing unit (2); wherein the analog signals include current signals and voltage signals;
the digital processing unit (2) is used for calculating the trigger angle value corresponding to the thyristor on each thyristor power bridge arm according to the received digital signals, and outputting all the calculated trigger angle values to the trigger pulse processing unit (3);
the trigger pulse processing unit (3) is used for generating trigger pulses corresponding to each trigger angle value and outputting all the generated trigger pulses to the driving final stage plate (4);
and the final stage plate (4) is driven and used for correspondingly adjusting the current of the thyristor according to each received trigger pulse to complete the parallel current sharing adjustment of the power bridge arm of the thyristor.
2. A module for parallel current sharing real-time regulation of thyristor power bridge arm according to claim 1, characterized in that the digital processing unit (2) comprises
The instantaneous impedance calculation unit is used for calculating the instantaneous impedance value of the thyristor on the bridge arm of the thyristor power supply according to the current signal and the voltage signal;
the trigger angle calculating unit is used for obtaining the trigger angle value of the thyristor on the bridge arm of the thyristor power supply according to the calculated instantaneous impedance value;
and the circulation control unit is used for controlling the instantaneous impedance calculation unit and the trigger angle calculation unit to execute corresponding calculation processing tasks according to a preset control circulation period.
3. The module for parallel current sharing real-time adjustment of thyristor power bridge arm according to claim 2, wherein the trigger angle calculation unit comprises
The current reference signal generation subunit is used for selecting the smallest current signal from all collected current signals, and taking the selected current signal as a current reference signal for parallel current sharing adjustment of a thyristor power bridge arm;
the voltage deviation calculating subunit is used for calculating the current deviation of each thyristor power supply bridge arm branch according to the current reference signal and the current signal of each thyristor power supply bridge arm branch and obtaining corresponding voltage deviation according to the current deviation of each thyristor power supply bridge arm branch;
the control angle value calculation subunit is used for calculating and obtaining the control angle value of each thyristor power supply bridge arm branch according to the voltage deviation of each thyristor power supply bridge arm branch;
the signal detection subunit is used for judging whether a new trigger angle control signal for controlling the thyristor is received or not; if a new trigger angle signal is received, a driving signal is sent to a trigger angle value calculating subunit; if no new trigger angle signal is received, continuing waiting;
and the trigger angle value calculating subunit is used for calculating the trigger angle value of each thyristor power bridge arm according to the received new trigger angle signal and the control angle value of each thyristor power bridge arm branch.
4. A module for parallel current sharing real-time adjustment of thyristor power bridge arm according to any one of claims 1-3, characterized in that the digital processing unit (2) is a DSP processing unit.
5. A system for real-time regulation of parallel current sharing of a thyristor power bridge arm, characterized by comprising a plurality of thyristor power bridge arm branches (5) and a module according to claim 1 or 2; the thyristor power supply bridge arm branches (5) are connected in parallel, and the signal output end of each thyristor power supply bridge arm branch (5) is connected with the signal input end of the AD sampling unit (1).
6. The system for parallel current sharing real-time adjustment of thyristor power bridge arm according to claim 5, wherein the thyristor power bridge arm branch (5) comprises a thyristor (51), a hall voltage sensor (52) and an open hall current sensor (53); the thyristor (51) is connected in series with the open-type Hall current sensor (53), the Hall voltage sensor (52) is connected to two ends of the thyristor (51) through a cable, and the Hall voltage sensor (52) and the open-type Hall current sensor (53) are connected with the AD sampling unit (1) through shielding twisted pairs.
7. The system for parallel current sharing real-time adjustment of thyristor power bridge arm according to claim 6, wherein the thyristor power bridge arm branch (5) further comprises a fast fuse (54), and the fast fuse (54) is connected in series between the thyristor (51) and the open hall current sensor (53).
8. A method for regulating parallel current sharing of a thyristor power bridge arm in real time is characterized by comprising the following steps:
acquiring analog signals on each thyristor power bridge arm in real time, and converting the acquired analog signals into corresponding digital signals; wherein the analog signals include current signals and voltage signals;
calculating according to the converted digital signals to obtain trigger angle values corresponding to thyristors on the bridge arm of each thyristor power supply;
generating a trigger pulse corresponding to each trigger angle value;
and correspondingly adjusting the current of the thyristor according to each trigger pulse to finish the parallel current sharing adjustment of the power bridge arm of the thyristor.
9. The method for real-time adjustment of parallel current sharing of a thyristor power bridge arm according to claim 8, wherein the method for obtaining the trigger angle value is as follows:
s1: according to the current signal and the voltage signal of each thyristor power bridge arm branch, calculating to obtain a corresponding instantaneous impedance value;
s2: selecting the smallest current signal from all collected current signals, and taking the selected current signal as a current reference signal for parallel current sharing adjustment of a thyristor power bridge arm;
s3: according to the current reference signal and the current signal of each thyristor power supply bridge arm branch, calculating the current deviation of each thyristor power supply bridge arm branch, and obtaining the corresponding voltage deviation according to the current deviation of each thyristor power supply bridge arm branch;
s4: calculating according to the voltage deviation of each thyristor power supply bridge arm branch to obtain a control angle value of each thyristor power supply bridge arm branch;
s5: judging whether a new trigger angle control signal for controlling the thyristor is received or not; if a new trigger angle signal is received, S6 is executed; if no new trigger angle signal is received, continuing waiting;
s6: and calculating the trigger angle value of each thyristor power bridge arm according to the received new trigger angle signal and the control angle value of each thyristor power bridge arm branch.
10. The method for parallel current sharing real-time adjustment of thyristor power bridge arm according to claim 9, wherein,
in S1, the calculation formula of the instantaneous impedance value isThe method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>Representing the instantaneous impedance +.>Representing a voltage signal>The current signal is represented, and n represents the number of the legs of the thyristor power supply bridge arm;
s4, the calculation formula of the control angle value is as followsThe method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>The control angle is indicated as such,U d representing the dc output voltage of a three-phase thyristor bridge converter,U 2 representing the ac input voltage of a three-phase thyristor bridge converter.
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