CN112152464A - Device series type direct current transformer with fault blocking capability and control method thereof - Google Patents
Device series type direct current transformer with fault blocking capability and control method thereof Download PDFInfo
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- CN112152464A CN112152464A CN202010920507.4A CN202010920507A CN112152464A CN 112152464 A CN112152464 A CN 112152464A CN 202010920507 A CN202010920507 A CN 202010920507A CN 112152464 A CN112152464 A CN 112152464A
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
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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
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc 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
- H02M7/217—Conversion of ac power input into dc 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
- H02M7/219—Conversion of ac power input into dc 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 in a bridge configuration
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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
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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
- H02M7/5387—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 in a bridge configuration
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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
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a device series type direct current transformer with fault blocking capability and a control method thereof, belonging to the technical field of power generation, power transformation or power distribution. The primary side of the converter topology is connected in seriesNThe half-bridge units are connected with a full-bridge module in parallel, wherein bridge arms of the full-bridge module are connected with each other in series through a plurality of switching devices to reduce the voltage stress of each switching device, and secondary sides of the full-bridge module are in a single-tube full-bridge structure. By series connectionNAnd the phase of generating zero level by the modulation of the half-bridge units provides a voltage zero crossing point for the commutation of a plurality of series-connected switching devices of the primary side full-bridge, thereby improving the reliability of the direct-current transformer. Meanwhile, the medium and high voltage input side does not have a centralized capacitor, so that the circuit has good faultA processing capability. A quasi square wave modulation mode is adopted in a control strategy, trapezoidal half waves are generated through a half-bridge unit, and then required trapezoidal full waves are generated through primary side full-bridge inversion to reduce dv/dtAnd meanwhile, the capacitor voltage balance of each sub-module is realized by alternately driving signals of each half-bridge unit.
Description
Technical Field
The invention relates to the power electronic technology, in particular to a device series type direct current transformer with fault blocking capability and a control method thereof, belonging to the technical field of power generation, power transformation or power distribution.
Background
As an important branch of power electronic integration technology, high-voltage high-power dc transformers have been the hot spot of research in recent years. The MMC (Modular Multilevel Converter) structure is widely applied to occasions such as high-voltage direct-current transmission and power electronic transformers due to the advantages of modularization, good fault handling capacity and the like. At present, researchers are paying attention to the application of the MMC structure in the direct-current transformer occasion, and the IGBT series connection technology is also applied to the medium-high voltage direct-current transformer occasion.
At present, a single-module high-voltage high-power direct-current transformer mainly comprises a direct-current transformer based on a single-tube high-voltage switching device, a direct-current transformer based on serial connection of switching devices and a direct-current transformer based on an MMC structure, wherein the cost of the single-tube high-voltage switching device is high; the driving requirement of the series switch device is higher, and dynamic voltage sharing is difficult to realize; the MMC structure has more switching capacitors, which is not beneficial to the improvement of power density.
Disclosure of Invention
The invention aims to provide a device serial direct current transformer with fault blocking capability and a control method thereof aiming at the defects of the background technology, the transformer topology provides a voltage zero crossing point for the commutation of a plurality of serial switching devices of a primary side full bridge structure through a zero level stage generated by the modulation of N serial half bridge units, the driving requirement is reduced, and the transformer topology has good fault processing capability similar to an MMC structure, and the technical problems that the direct current transformer of the serial switching devices has higher driving requirement and the power density of the direct current transformer based on the MMC structure needs to be improved are solved.
The invention adopts the following technical scheme for realizing the aim of the invention:
a device-in-series dc transformer topology with fault blocking capability, comprising: the single-tube full-bridge rectifier comprises a transformer, a primary side topology and a secondary side topology, wherein the primary side topology is formed by connecting N half-bridge units in series with a full-bridge inverter module in parallel, the secondary side topology is a single-tube full-bridge rectifier module, a branch formed by connecting the N half-bridge units in series is connected between a positive polarity input terminal and a negative polarity input terminal of the full-bridge inverter module, an output end formed by midpoints of bridge arms of the full-bridge inverter module is connected with a primary side winding of the transformer, and an input end formed by midpoints of bridge. The positive polarity input direct current bus is connected with an input side inductor in series, the output end of the full bridge rectifier module is connected with an output filter capacitor in parallel, and the transformer topology is connected with a medium and high voltage direct current power supply through the positive and negative polarity input direct current bus.
The bridge arm of the full-bridge inversion module is formed by connecting a plurality of switching devices in series so as to reduce the voltage stress of each switching device; the zero level stage is generated through the modulation of N half-bridge units connected in series, so that a voltage zero crossing point is provided for the commutation of a plurality of series-connected switching devices of the full-bridge inversion module, and the reliability of the whole direct-current transformer is improved; meanwhile, no centralized capacitor exists at the input side of the medium-high voltage direct current power supply, and the fault handling capacity is good. In the aspect of control strategy, quasi square wave modulation is adopted, trapezoidal half waves are generated through a half-bridge unit, then the trapezoidal half waves are inverted through a primary full-bridge unit, and then the needed trapezoidal full waves are generated to reduce dv/dt.
In a primary side topology, each half-bridge unit comprises a bridge arm formed by connecting two switching tubes in series and a capacitor connected in parallel at two ends of the bridge arm, the connection point of the switching tubes and the capacitor on the bridge arm is the anode of the half-bridge unit, the connection point of the switching tubes and the capacitor under the bridge arm is the cathode of the half-bridge unit, the bridge arm midpoint of the 1 st half-bridge unit is connected with the positive input terminal of the full-bridge inversion module, the bridge arm midpoint of the 2 nd half-bridge unit is connected with the cathode of the 1 st half-bridge unit, the bridge arm midpoint of the ith half-bridge unit is connected with the cathode of the (i-1) th half-bridge unit, the bridge arm midpoint of the Nth half-bridge unit is connected with the cathode of the (N-1) th half; the full-bridge inversion module comprises a first bridge arm formed by connecting a first switch tube group and a second switch tube group in series, a second bridge arm formed by connecting a third switch tube group and a fourth switch tube group in series, the middle point of the first bridge arm is connected to one end of the primary winding through a power transmission inductor, the middle point of the second bridge arm is connected to the other end of the primary winding, and i is 1, 2, …, N; the switching tubes in the primary side topology are connected with a diode in an anti-parallel mode.
The single-tube full-bridge rectification module of the secondary side topology comprises: the power transmission device comprises a first bridge arm formed by connecting a first switching tube and a second switching tube in series, a second bridge arm formed by connecting a third switching tube and a fourth switching tube in series, wherein the midpoint of the first bridge arm and one end connected with a secondary winding are the same-name ends with each other as the ends connected with a power transmission inductor and a primary winding, and the midpoint of the second bridge arm is connected with the other end of the secondary winding.
The method comprises the steps that a quasi-square wave control strategy is adopted to achieve that the topological output voltage of the transformer follows a set value of the transformer, a topological real-time output voltage value is firstly acquired, the real-time output voltage value is different from a voltage set value, a real-time phase shift angle is obtained through a PI regulator and an amplitude limiter, all half-bridge units are circularly and alternately driven to generate required trapezoidal half-waves, and a full-bridge inversion module is enabled at a zero-level output stage of a half-bridge unit series branch; then, the required trapezoidal full wave is generated by the full-bridge inversion module on the primary side, and the full-bridge rectification module is driven in a mode of lagging the driving waveform of the full-bridge inversion module to shift the phase angle in real time so as to stabilize the output voltage of the whole direct current transformer.
The driving signals of the switching tube on the primary side of the transformer are as follows: the duty ratios of driving waveforms of upper switching tubes of the half-bridge units are equal and are all 90%, and the phase difference between every two driving waveforms is theta. And driving signals of the upper and lower switching tubes of the half-bridge unit are complementary. The drive signals of the first switch tube group and the second switch tube group in the full-bridge inversion module are complementary, the duty ratio is 50%, the drive signals of the third switch tube group and the fourth switch tube group are complementary, the duty ratio is 50%, the drive signals of the first switch tube group and the fourth switch tube group are the same, and the drive signals of the second switch tube group and the third switch tube group are the same. The switching frequency of the upper and lower switching tubes in the half-bridge unit is 2 times that of each switching tube group in the full-bridge inversion module.
The driving signals of the switching tube on the secondary side of the transformer are as follows: the driving signals of the first switching tube and the second switching tube are complementary, the duty ratio of the first switching tube is 50%, the driving signals of the third switching tube and the fourth switching tube are complementary, the duty ratio of the third switching tube and the fourth switching tube is 50%, the driving signals of the first switching tube and the fourth switching tube are the same, and the driving signals of the second switching tube and the third switching tube are the same.
By adopting the technical scheme, the invention has the following beneficial effects:
(1) the direct current transformer that this application disclosed has connect in parallel the branch road that concatenates of half-bridge unit in the direct current side of full-bridge contravariant module, can realize single high frequency transformer, can reduce submodule piece quantity under the same input voltage grade condition, improves power density.
(2) The zero level stage of the half-bridge unit series branch circuit is utilized to provide a voltage zero crossing point for the switch tube in the full-bridge inversion module, so that ZVS of the series switch group is realized, the efficiency is high, and the voltage is adjustable.
(3) The large inductor connected to the input side of the medium-high voltage power supply can effectively reduce input current ripples, does not have a centralized capacitor, and has good fault handling capacity.
Drawings
Fig. 1 is a circuit topology diagram of a device series dc transformer with fault blocking capability disclosed in the present application.
Fig. 2 is a circuit topology diagram of a device series-connected dc transformer with fault blocking capability when N is 6.
Fig. 3 is a waveform diagram of a typical driving signal of the series-connected dc transformer shown in fig. 2.
Fig. 4 is a simulation diagram of voltage waveforms at an AB point in the series-connected dc transformer topology shown in fig. 2.
Fig. 5 is a simulation diagram of the CD point voltage and the inductor current waveforms in the topology of the series-connected dc transformer shown in fig. 2.
Fig. 6 is a simulation diagram of the voltage waveform of the capacitor of each sub-module of the primary side of the series-connected dc transformer shown in fig. 2.
Fig. 7 is a simulation diagram of the output voltage waveform of the series-connected dc transformer shown in fig. 2.
Fig. 8 is an expanded circuit topology diagram of the series-connected dc transformer with the fault blocking capability according to the present application.
The reference numbers in the figures illustrate: s11～SN1Is the upper switch tube of the 1 st to Nth half-bridge units, S12～SN2Is the lower switch tube of the 1 st to Nth half-bridge unit, T1～T4Is a first to fourth switch group, Q1～Q4Is a first to a fourth switch, LinIs an input side inductance, LrFor power transfer inductance, T for transformer, C1～CNIs a first to Nth capacitor, CoTo output the filter capacitance.
Detailed Description
The technical scheme of the invention is explained in detail in the following with reference to the attached drawings.
The following are only preferred embodiments of the present invention, it being noted that: it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention.
As shown in fig. 1, the device series dc transformer with fault blocking capability disclosed in the present application includes: a transformer, a primary side topology, and a secondary side topology. The primary side topology is formed by connecting N half-bridge units in series with a full-bridge inversion module in parallel to form an ith half-bridge unit, and the ith half-bridge unit comprises an upper switching tube Si1And a lower switch tube Si2Bridge arm formed by connecting in series and ith capacitor C connected in parallel at two ends of bridge armiGo up switch tube Si1And the ith capacitor CiThe connecting point of (a) is the positive pole of the ith half-bridge unit, and the switching tube Si2And the ith capacitor CiThe connecting point of (1) is the negative pole of the ith half-bridge unit, the bridge arm midpoint of the 1 st half-bridge unit is connected with the positive input terminal of the full-bridge inverter module, the bridge arm midpoint of the 2 nd half-bridge unit is connected with the negative pole of the 1 st half-bridge unit, the bridge arm midpoint of the ith half-bridge unit is connected with the negative pole of the (i-1) th half-bridge unit, the bridge arm midpoint of the Nth half-bridge unit is connected with the negative pole of the (N-1) th half-bridge unit, the negative pole of the Nth half-bridge unit is connected with the negative input terminal of the full-bridge inverter moduleAnd N. The full-bridge inversion module comprises: first switch tube group T1And a second switch tube group T2A first bridge arm and a third switching tube group T which are connected in series3Is connected with a fourth switch tube T4A second bridge arm formed by series connection, the midpoint of the first bridge arm passes through a power transmission inductor LrAnd the middle point of the second bridge arm is connected to the other end of the primary winding. The secondary side topology is a full-bridge rectification module, and specifically includes: first switch tube Q1And a second switch tube Q2A first bridge arm and a third switching tube Q which are connected in series3And a fourth switching tube Q4A second bridge arm formed by connecting in series, wherein the midpoint of the first bridge arm and one end connected with the secondary winding of the transformer T are connected with the power transmission inductor LrAnd one ends connected with the primary side winding are the same-name ends, and the middle point of the second bridge arm is connected with the other end of the secondary side winding. The branch circuit formed by connecting N half-bridge units in series is connected between the positive and negative input terminals of the full-bridge inversion module, the output end formed by the middle points of each bridge arm of the full-bridge inversion module is connected with the primary winding of the transformer, and the input end formed by the middle points of each bridge arm of the full-bridge rectification module is connected with the secondary winding of the transformer. An input side inductor L is connected in series on the positive polarity input direct current businThe output end of the full-bridge rectifier module is connected with an output filter capacitor C in paralleloThe transformer topology is connected to a medium-high voltage direct current power supply V through a positive and negative polarity input direct current busin。
An expanded topology of the device serial direct-current transformer with the fault blocking capability is shown in fig. 8, a single tube in a secondary full-bridge rectifier module can be replaced by a switch group in series connection, and the output end of the full-bridge rectifier module is connected in parallel with a half-bridge unit serial branch which is the same as the primary side and then is connected to a medium-high voltage direct-current bus.
In the aspect of a control strategy, a quasi-square wave modulation strategy is adopted to realize that the topological output voltage of the transformer follows the set value of the transformer, a topological real-time output voltage value is firstly acquired, the real-time output voltage value is differed from the set voltage value, a real-time phase shift angle is obtained by the difference value through a PI regulator and an amplitude limiter, each half-bridge unit is circularly and alternately driven to generate a required trapezoidal half-wave, and a full-bridge inversion module is enabled at a zero level output stage of a series branch of the half-bridge units; then, the required trapezoidal full wave is generated by the full-bridge inversion module on the primary side, and the full-bridge rectification module is driven in a mode of lagging the driving waveform of the full-bridge inversion module to shift the phase angle in real time so as to stabilize the output voltage of the whole direct current transformer.
The switching tube driving waveform of the primary side of the converter is as follows: switch tube S on half-bridge unit11～SN1The duty ratios of the driving waveforms are equal to 90% and the phase difference between every two driving waveforms is theta. Upper switch tube Si1And a lower switching tube Si2The drive waveforms of (a) are complementary. First switch tube group T in full-bridge inversion module1And a second switch tube group T2The driving waveforms are complementary, the duty ratios are all 50%, and the third switching tube group T3And a fourth switching tube group T4The driving waveforms are complementary and the duty ratio is 50%, the first switch tube group T1And a fourth switching tube group T4The driving waveforms are the same, and the second switch tube group T2And a third switch tube group T3The drive waveforms are the same. Switching tube S in half-bridge uniti1And Si2The switching frequency is the switching tube group T in the full-bridge inversion module j2 times of the total weight of the composition; 1, 2, …, N; j is 1, 2, 3, 4.
The driving waveforms of the switching tube on the secondary side of the transformer are as follows: first switch tube Q1And a second switching tube Q2The driving waveforms are complementary, the duty ratios are all 50%, and the third switching tube Q3And a fourth switching tube Q4The driving waveforms are complementary and the duty ratio is 50%, the first switch tube Q1And a fourth switching tube Q4The driving waveforms are the same, and the second switch tube Q2Drive and third switching tube Q3The drive waveforms are the same. First switch tube group T1Drive waveform of (1) and first switching tube Q1Has a phase shift angle between the driving waveforms
By phase-shifting angle
The regulation controlling the output voltage of the whole DC transformerMagnitude, phase shift angle
The output voltage difference is subjected to PI regulation and amplitude limiting processing to obtain the voltage difference.
The working principle of the technical solution of the present invention is described below by taking an N-6 device series-connected dc transformer system (as shown in fig. 2) with fault blocking capability as an example and combining the simulation result. The simulation parameters are as follows:
simulation main parameters
Fig. 2 is a schematic diagram of a main circuit of a device series type dc transformer system with fault blocking capability, where N is 6, and a control manner of fig. 3 is used to provide driving signals of the inverter according to the control method set forth above. As can be seen from FIG. 3, at t0～t1During the period, all half-bridge unit capacitors are bypassed, and the voltage v at the AB point of the system is reducedABIs zero, then at t0～t1Switching is carried out in the interval (mainly considering the turn-on and turn-off time delay of the IGBTs and reserving a certain allowance to ensure that all series-connected IGBTs complete the switching action), so that the condition that partial IGBTs are damaged by overvoltage due to inconsistent driving of series-connected devices can be prevented, the reliability of a system is improved, meanwhile, the zero-voltage turn-on of the series-connected IGBTs is ensured, and the efficiency of the system is improved. FIG. 4 shows the voltage v at the AB point of the systemABThe simulation waveform is six-level voltage with maximum voltage 11111V, minimum voltage 0V and interval voltage 1852V. FIG. 5 shows the voltage v at the system CD pointCDThe simulation waveform is a twelve-level quasi square wave voltage with the highest voltage of 11111V and the lowest voltage of-11111V. Fig. 6 shows the respective sub-module capacitor voltage waveforms, each sub-module capacitor voltage being maintained substantially at around 1851.6V. FIG. 7 shows the output power of the systemVoltage simulation, it can be seen that the system output voltage can be stabilized at a given 1000V after a short adjustment.
In a word, the device series type direct current transformer with the fault blocking capability disclosed by the invention has the advantages that the plurality of switching devices are connected in series to form a switching group of the full-bridge inversion module, the voltage stress of each switching device is reduced, the zero level stage generated by the modulation of the N half-bridge units connected in series provides a voltage zero crossing point for the commutation of the plurality of series switching devices of the primary side full bridge, and the reliability of the whole direct current transformer is improved. Meanwhile, a centralized capacitor does not exist at the medium and high voltage input side, and the fault handling capacity is good. In the aspect of control strategy, a quasi square wave modulation mode is adopted, trapezoidal half waves are generated through a half-bridge unit firstly, a full-bridge inversion module is driven in a time interval of cyclic alternate driving, then required trapezoidal full waves are generated through a primary full-bridge inversion module to reduce dv/dt, and meanwhile, the balance of capacitor voltage of each sub-module is realized through alternately driving signals of each half-bridge unit.
Claims (8)
1. A device series connection type direct current transformer with fault blocking capability is characterized by comprising: the system comprises a transformer, a primary side topology connected to a medium-high voltage direct current input bus and a secondary side topology connected to a medium-high voltage direct current output bus, wherein the primary side topology comprises:Na branch circuit of a half-bridge unit connected in series and a full-bridge inversion module, wherein the secondary side topology is a full-bridge rectification module,Nthe branch circuit of the half-bridge unit is connected between the positive and negative input terminals of the full-bridge inversion module, the output end formed by the middle points of the bridge arms of the full-bridge inversion module is connected with the primary winding of the transformer, the input end formed by the middle points of the bridge arms of the full-bridge rectification module is connected with the secondary winding of the transformer, and the output end of the full-bridge rectification module is connected with the output filter capacitor in parallel.
2. The device-in-series direct current transformer with fault blocking capability according to claim 1, wherein each half-bridge unit comprises a bridge arm formed by two switching tubes connected in series and a capacitor connected in parallel at two ends of the bridge arm, and a connection point of the switching tube and the capacitor on the bridge arm is a positive side of the half-bridge unitThe connecting point of a switch tube and a capacitor under the bridge arm is the negative electrode of the half-bridge unit, the bridge arm midpoint of the 1 st half-bridge unit is connected with the positive input terminal of the full-bridge inversion module, the bridge arm midpoint of the 2 nd half-bridge unit is connected with the negative electrode of the 1 st half-bridge unit, and the second half-bridge unitiThe middle point of the bridge arm of each half-bridge unit is connected withi1 negative pole of half-bridge cell, secondNThe middle point of the bridge arm of each half-bridge unit is connected withN1 negative pole of half-bridge cell, secondNThe negative pole of each half-bridge unit is connected with the negative input terminal of the full-bridge inversion module,i=1，2，…，N。
3. the device-in-series direct current transformer with the fault blocking capability according to claim 1, wherein the full-bridge inverter module comprises a first bridge arm formed by connecting a first switch tube group and a second switch tube group in series, a second bridge arm formed by connecting a third switch tube group and a fourth switch tube group in series, a midpoint of the first bridge arm is connected to one end of the primary winding through a power transmission inductor, and a midpoint of the second bridge arm is connected to the other end of the primary winding.
4. The device series type direct current transformer with the fault blocking capability of claim 1, wherein the full-bridge rectifier module comprises: the power transmission device comprises a first bridge arm formed by connecting a first switching tube and a second switching tube in series, a second bridge arm formed by connecting a third switching tube and a fourth switching tube in series, wherein the midpoint of the first bridge arm and one end connected with a secondary winding are the same-name ends with each other as the ends connected with a power transmission inductor and a primary winding, and the midpoint of the second bridge arm is connected with the other end of the secondary winding.
5. The device-in-series dc transformer with fault blocking capability of claim 1, wherein the positive polarity medium-high voltage dc input bus is connected in series with an input side inductor.
6. The device series type direct current transformer with the fault blocking capability of claim 4, wherein the first, second, third and fourth switching tubes are composed of a plurality of IBGT in series connection.
7. The method for controlling a series-connected device dc transformer with fault blocking capability as claimed in any one of claims 1 to 6, wherein each half-bridge unit is cyclically and alternately driven to generate a trapezoidal half-wave, and the switch tube set in the full-bridge inverter module is enabled at the zero level output stage of the series branch of the half-bridge unit, the full-bridge inverter module generates a trapezoidal full-wave under the action of its driving signal, and the full-bridge rectifier module is driven in a manner of lagging the driving waveform of the full-bridge inverter module to shift the phase angle in real time until the output voltage of the dc transformer is stable.
8. The method for controlling a device-series direct current transformer with fault blocking capability according to claim 7, wherein the method for obtaining the real-time phase shift angle comprises: the real-time output voltage value of the direct current transformer is sampled, and PI regulation and amplitude limiting regulation are carried out on the difference value of the real-time output voltage value and the voltage given value to obtain a real-time phase shift angle.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113054861A (en) * | 2021-03-08 | 2021-06-29 | 东南大学 | Series MMC converter topological structure with few modules |
| CN113162446A (en) * | 2021-04-15 | 2021-07-23 | 贵州电网有限责任公司 | Hybrid bridge arm converter topological structure suitable for high-voltage direct-current power transmission |
| CN113472212A (en) * | 2021-07-14 | 2021-10-01 | 东南大学 | Modular multilevel DC transformer topological structure and control method thereof |
| WO2022237978A1 (en) * | 2021-05-12 | 2022-11-17 | Huawei Technologies Co., Ltd. | A quasi three-level power converter |
| CN115694192A (en) * | 2021-07-26 | 2023-02-03 | 中兴通讯股份有限公司 | Voltage conversion circuit, control method, power supply device, and storage medium |
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| CN116388580A (en) * | 2023-05-08 | 2023-07-04 | 国网湖南省电力有限公司 | Medium-low-voltage modular multilevel converter suitable for direct-current power grid and control method |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103633845A (en) * | 2013-12-19 | 2014-03-12 | 国家电网公司 | DC-DC (Direct-Current-Direct-Current) converter |
| CN104485821A (en) * | 2014-11-18 | 2015-04-01 | 浙江大学 | Direct current transformer device used for power distribution |
| CN108880217A (en) * | 2018-06-04 | 2018-11-23 | 东南大学 | Double active bridge DC converter soft start control methods applied to intelligent distribution network |
| CN109149946A (en) * | 2018-09-20 | 2019-01-04 | 南京工程学院 | A kind of DC/DC current transformer voltage balance control policy optimization method |
| CN109474193A (en) * | 2018-09-12 | 2019-03-15 | 上海交通大学 | A kind of modular solid-state transformer based on three level of diode clamp bit-type |
| CN109951084A (en) * | 2019-04-03 | 2019-06-28 | 浙江大学 | The high-power high no-load voltage ratio resonant mode DC power supply of one kind and its working method |
| CN110289765A (en) * | 2019-06-18 | 2019-09-27 | 东南大学 | A kind of the DAB type commutator transformer submodule topology and its control method of high power density |
| CN110350547A (en) * | 2019-08-02 | 2019-10-18 | 哈尔滨理工大学 | A kind of more level reactive compensation systems and its control method suitable for unbalanced load |
| EP3609069A1 (en) * | 2018-08-06 | 2020-02-12 | General Electric Technology GmbH | Converter system |
| CN111092544A (en) * | 2019-12-19 | 2020-05-01 | 中电普瑞电力工程有限公司 | Direct current transformer subunit and direct current transformer comprising same |
-
2020
- 2020-09-04 CN CN202010920507.4A patent/CN112152464A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103633845A (en) * | 2013-12-19 | 2014-03-12 | 国家电网公司 | DC-DC (Direct-Current-Direct-Current) converter |
| CN104485821A (en) * | 2014-11-18 | 2015-04-01 | 浙江大学 | Direct current transformer device used for power distribution |
| CN108880217A (en) * | 2018-06-04 | 2018-11-23 | 东南大学 | Double active bridge DC converter soft start control methods applied to intelligent distribution network |
| EP3609069A1 (en) * | 2018-08-06 | 2020-02-12 | General Electric Technology GmbH | Converter system |
| CN109474193A (en) * | 2018-09-12 | 2019-03-15 | 上海交通大学 | A kind of modular solid-state transformer based on three level of diode clamp bit-type |
| CN109149946A (en) * | 2018-09-20 | 2019-01-04 | 南京工程学院 | A kind of DC/DC current transformer voltage balance control policy optimization method |
| CN109951084A (en) * | 2019-04-03 | 2019-06-28 | 浙江大学 | The high-power high no-load voltage ratio resonant mode DC power supply of one kind and its working method |
| CN110289765A (en) * | 2019-06-18 | 2019-09-27 | 东南大学 | A kind of the DAB type commutator transformer submodule topology and its control method of high power density |
| CN110350547A (en) * | 2019-08-02 | 2019-10-18 | 哈尔滨理工大学 | A kind of more level reactive compensation systems and its control method suitable for unbalanced load |
| CN111092544A (en) * | 2019-12-19 | 2020-05-01 | 中电普瑞电力工程有限公司 | Direct current transformer subunit and direct current transformer comprising same |
Non-Patent Citations (1)
| Title |
|---|
| LIANGCAI SHU，ET AL,: "Improved DC Transformer Submodule with High Input voltage", 《2020 IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION》 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113054861A (en) * | 2021-03-08 | 2021-06-29 | 东南大学 | Series MMC converter topological structure with few modules |
| CN113054861B (en) * | 2021-03-08 | 2022-03-29 | 东南大学 | Series MMC converter topological structure with few modules |
| CN113162446A (en) * | 2021-04-15 | 2021-07-23 | 贵州电网有限责任公司 | Hybrid bridge arm converter topological structure suitable for high-voltage direct-current power transmission |
| WO2022237978A1 (en) * | 2021-05-12 | 2022-11-17 | Huawei Technologies Co., Ltd. | A quasi three-level power converter |
| CN113472212A (en) * | 2021-07-14 | 2021-10-01 | 东南大学 | Modular multilevel DC transformer topological structure and control method thereof |
| CN115694192A (en) * | 2021-07-26 | 2023-02-03 | 中兴通讯股份有限公司 | Voltage conversion circuit, control method, power supply device, and storage medium |
| CN115694192B (en) * | 2021-07-26 | 2024-04-26 | 中兴通讯股份有限公司 | Voltage conversion circuit, control method, power supply device, and storage medium |
| CN115995965A (en) * | 2023-03-22 | 2023-04-21 | 浙江大学杭州国际科创中心 | Modularized wide-input wide-output voltage range DC-DC converter |
| CN116388580A (en) * | 2023-05-08 | 2023-07-04 | 国网湖南省电力有限公司 | Medium-low-voltage modular multilevel converter suitable for direct-current power grid and control method |
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