CN112436746A - Modularized multi-level high-voltage electromagnetic transmitting circuit - Google Patents

Modularized multi-level high-voltage electromagnetic transmitting circuit Download PDF

Info

Publication number
CN112436746A
CN112436746A CN202011222330.7A CN202011222330A CN112436746A CN 112436746 A CN112436746 A CN 112436746A CN 202011222330 A CN202011222330 A CN 202011222330A CN 112436746 A CN112436746 A CN 112436746A
Authority
CN
China
Prior art keywords
phase
bridge arm
voltage
submodules
bridge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202011222330.7A
Other languages
Chinese (zh)
Other versions
CN112436746B (en
Inventor
李刚
张昕昊
于生宝
郭群
庞笑雨
秘家一
李超臣
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jilin University
Original Assignee
Jilin University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jilin University filed Critical Jilin University
Priority to CN202011222330.7A priority Critical patent/CN112436746B/en
Publication of CN112436746A publication Critical patent/CN112436746A/en
Application granted granted Critical
Publication of CN112436746B publication Critical patent/CN112436746B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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
    • H02M7/53871—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 with automatic control of output voltage or current

Abstract

The invention belongs to the field of electrical detection instruments in geophysical exploration, and particularly relates to a modular multilevel high-voltage electromagnetic transmitting circuit which is suitable for a high-power high-voltage inversion transmitting device of an electrical instrument. The generator generates 380V and 50Hz three-phase alternating current; obtaining stable direct current voltage of about 500V as direct current bus voltage at the input side of the transmitting bridge circuit through a three-phase rectifier bridge and an isolated DC/DC converter; the transmitting bridge circuit adopts an MMC topological structure, adopts a driving circuit to provide a driving signal for the transmitting bridge circuit, and provides multi-level stable voltage or current for an earth load; the modular design is adopted, low-voltage devices are selected for each stage, high-voltage output is realized by multi-stage series connection, voltage stress and switching loss are greatly reduced, and the modular multi-stage high-voltage power supply has the advantages of simple topological structure, easiness in cascade expansion, easiness in realizing redundancy control and the like.

Description

Modularized multi-level high-voltage electromagnetic transmitting circuit
Technical Field
The invention belongs to the field of electrical detection instruments in geophysical exploration, and particularly relates to a modular multilevel high-voltage electromagnetic transmitting circuit of a high-power high-voltage inversion transmitting device suitable for electrical instruments.
Background
The development of energy and the utilization of resources are the basis of economic development, the rapid development of economy in recent years leads the demand of various countries on mineral resources to be increasingly increased, and deep detection is an effective way for solving the crisis of the mineral resources. An electromagnetic method instrument with an electric source for geophysical exploration needs to supply a transmitting current to an earth load, a primary pulse magnetic field is established underground, and the exploration depth is generally in positive correlation with the strength of a transmitting signal. In order to realize deep detection, an electromagnetic transmitting system with higher voltage and higher power needs to be developed on the basis of the existing transmitting system, and the technical level of detection equipment is improved.
The electromagnetic emission system is widely applied to a two-level inverter, when the output voltage level is higher, higher voltage stress and electromagnetic interference (EMI) exist, the requirement on a switching device is high, the switching frequency is high, the loss is large, the problems of heavy equipment weight, high cost and the like can be caused by a large heat dissipation system, and great difficulty is caused in field application of instruments. The common practice is to increase the voltage-bearing capacity by connecting a plurality of low-voltage switching devices in series, which reduces the cost to a certain extent, but has the problems of static and dynamic voltage sharing, and the voltage sharing circuit causes the problems of system complexity, loss increase, efficiency reduction and the like.
In order to avoid the above technical problems, in the 80 s of the 20 th century, a new idea of a novel inverter, namely a multi-level inverter, began to appear and received extensive attention. The multi-level inverter is optimized in a topological structure, the voltage stress is reduced by increasing the number of output levels, the switching tube works in a low-voltage and low-frequency state to reduce switching loss and EMI, the system inversion efficiency is high, and the multi-level inverter is more suitable for high-voltage and high-power application. Although the number of the switching devices is increased, the low-voltage low-frequency switching devices are selected, and the overall cost of the inverter is still reduced. The multi-level circuit topology mainly comprises a diode clamping type, a flying capacitor type and a cascade type, and in recent years, the multi-level technology is applied to an electromagnetic emission system. In patent No. CN103973147A, five-level inversion output of a diode-clamped transmitting circuit is realized, and the voltage on the IGBT is reduced to 1/2 of the dc bus voltage, thereby effectively increasing the output voltage. However, when the number of levels exceeds 5, the number of diodes and capacitors required increases sharply, and the topology becomes extremely complicated. In patent No. CN105375803A, a cascaded topology structure is adopted, so that cascaded H-bridge type five-level output is realized, and although the problem of voltage sharing of capacitors is avoided and the degree of modularization is high, an independent power supply is required under each module. As the number of levels increases, the dc power supply circuit becomes extremely complicated, and it is difficult to implement redundant control of the system.
Disclosure of Invention
The invention aims to provide a Modular Multilevel (MMC) -based high-voltage electromagnetic transmitting circuit. The modular design is adopted, low-voltage devices are selected for each stage, high-voltage output is realized by multi-stage series connection, voltage stress and switching loss are greatly reduced, and the modular multi-stage high-voltage power supply has the advantages of simple topological structure, easiness in cascade expansion, easiness in realizing redundancy control and the like.
The invention is realized in this way, a modular multilevel high-voltage electromagnetic emission circuit, the circuit includes:
the generator generates 380V and 50Hz three-phase alternating current;
obtaining stable direct current voltage of about 500V as direct current bus voltage at the input side of the transmitting bridge circuit through a three-phase rectifier bridge and an isolated DC/DC converter;
the transmitting bridge circuit adopts an MMC topological structure, adopts a driving and protecting circuit to provide a driving signal for the transmitting bridge circuit, and provides multi-level stable voltage or current for an earth load; wherein, the hairThe radio bridge circuit comprises an a-phase p bridge arm, an a-phase n bridge arm, a B-phase p bridge arm and a B-phase n bridge arm, each bridge arm comprises a plurality of SM submodules connected in series, the connection point of the a-phase p bridge arm and the a-phase n bridge arm is used as an alternating current output end A, the connection point of the B-phase p bridge arm and the B-phase n bridge arm is used as an alternating current output end B, the two points of the alternating current output end A and the alternating current output end B are used as output ends of a transmitting bridge circuit, theABAnd is connected with the earth load through a lead.
Further, the SM sub-module extension includes an IGBT switching device S1, an IGBT switching device S2, a freewheeling diode D1, a freewheeling diode D2, and a capacitor C, the IGBT switching device S1 is connected in parallel with the freewheeling diode D1, the IGBT switching device S2 is connected in parallel with the freewheeling diode D2, the IGBT switching device S2 is connected in parallel with the capacitor C after being connected in series, the IGBT switching device S2 is connected in parallel with the capacitor C at a connection point M of the IGBT switching device S1, the other end point of the IGBT switching device S2 is a connection point P, and the connection point M and the connection point P serve as external ports of the half-bridge.
Further, the IGBT switching device S1 and the IGBT switching device S2 are driven by a drive circuit.
Further, the number of SM submodules thrown into the two phases is N, and the following conditions are met: n is a radical ofap+Nan＝Nbp+Nbn＝NNapAnd NanThe number of sub-modules of an a-phase p bridge arm and an a-phase N bridge arm SM is NbpAnd NbnThe number of the sub-modules is p bridge arms of a phase b and n bridge arms of a phase b;
ud is input side direct current voltage, N SM submodule capacitor blocks input to each phase are connected in series for voltage division, and the capacitor voltage UC is
Figure BDA0002762499180000031
Further, the transmitting circuit outputs the output voltage U at multiple levelsABIn the range of [ -U [ - ]d，Ud]Ud is input side direct current voltage, N-1 levels are totally output, and the levels are output in sequence in one period T, namely
Figure BDA0002762499180000032
N isThe number of SM submodules which are input in two phases is as follows:
in that
Figure BDA0002762499180000033
In the time period, 0 SM submodule is put into an a-phase p bridge arm, N SM submodules are put into an a-phase N bridge arm, N SM submodules are put into a B-phase p bridge arm, 0 SM submodule is put into a B-phase N bridge arm, the potential of a point A is 0, and the potential of a point B is NUCAt an emission voltage of
UAB＝UA-UB＝-NUC＝-Ud
In that
Figure BDA0002762499180000034
In the time period, a phase p bridge arm is put into 1 SM submodule, a phase N bridge arm is put into N-1 SM submodule, a phase p bridge arm is put into N-1 SM submodule, a phase N bridge arm is put into 1 SM submodule, and the potential of the point A is UCThe potential at the point B is (N-1) UCOutput voltage of
Figure BDA0002762499180000035
In that
Figure BDA0002762499180000041
In the time period, an a-phase p bridge arm is put into 2 SM submodules, an a-phase N bridge arm is put into N-2 SM submodules, a b-phase p bridge arm is put into N-2 SM submodules, a b-phase N bridge arm is put into 2 SM submodules, and the potential of the point A is 2UCThe potential at the point B is (N-2) UCOutput voltage of
Figure BDA0002762499180000042
In that
Figure BDA0002762499180000043
In the time period, an a-phase p bridge arm is put into N-2 SM submodules, an a-phase N bridge arm is put into 2 SM submodules, a b-phase p bridge arm is put into 2 SM submodules, and a b-phaseN bridge arms are put into N-2 SM submodules, and the potential of the point A is UCThe potential at the point B is (N-1) UCOutput voltage of
Figure BDA0002762499180000044
In that
Figure BDA0002762499180000045
In the time period, an a-phase p bridge arm is put into N-1 SM submodules, an a-phase N bridge arm is put into 1 SM submodule, a b-phase p bridge arm is put into 1 SM submodule, a b-phase N bridge arm is put into N-1 SM submodules, and the potential of the point A is UCThe potential at the point B is (N-1) UCOutput voltage of
Figure BDA0002762499180000046
In that
Figure BDA0002762499180000047
In the time period, an a-phase p bridge arm is put into N SM submodules, an a-phase N bridge arm is put into 0 SM submodules, a b-phase p bridge arm is put into 0 SM submodules, a b-phase N bridge arm is put into N SM submodules, and the potential of an A point is NUcThe potential at point B is 0, and the output voltage is
UAB＝UA-UB＝NUC＝Ud
In that
Figure BDA0002762499180000048
Within a time period of each
Figure BDA0002762499180000049
In a time period, ensuring that the total number of input submodules of each phase of two bridge arms is N, adjusting the number of the respective SM input submodules of the two phases of the p bridge arm and the N bridge arm, and outputting a voltage UABImplementation of
Figure BDA00027624991800000410
To
Figure BDA00027624991800000411
Is output by the segment.
Compared with the prior art, the invention has the beneficial effects that:
series expansion and redundancy design can be realized by setting the number N of the SM submodules connected in series with each bridge arm.
The transmitting bridge circuit adopts a modular multilevel topological structure, the voltage and du/dt borne by the switching tube of each SM submodule depends on the capacitance voltage connected with the switching tube in parallel in the SM submodule, and the voltage stress is the direct-current bus voltage
Figure BDA0002762499180000051
The high-voltage electromagnetic emission system has the advantages of small du/dt, small EMI (electro-magnetic interference), high inversion efficiency, simple topological structure, high modularization degree, easiness in cascade expansion and redundancy control, can achieve the purpose of high-voltage and high-power output by using low-voltage-withstanding and low-power devices, and is suitable for high-voltage electromagnetic emission systems.
Drawings
FIG. 1 is a block diagram of a high-voltage electromagnetic emission system;
FIG. 2 is a block diagram of a modular multilevel transmit bridge;
FIG. 3 is a diagram of an SM sub-module topology;
FIG. 4 is a schematic diagram of an equivalent model of a modular multilevel transmit bridge;
fig. 5 is an N-level output waveform diagram.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, a block diagram of a high-voltage electromagnetic emission system according to the present invention is shown in fig. 1. The system comprises a generator, a direct current power supply, an MMC transmitting bridge circuit and an earth load.
The generator generates 380V and 50Hz three-phase alternating current;
obtaining stable direct current voltage of about 500V as direct current bus voltage at the input side of the transmitting bridge circuit through a three-phase rectifier bridge and an isolated DC/DC converter;
the transmitting bridge circuit adopts an MMC topological structure, adopts a driving circuit to provide a driving signal for the transmitting bridge circuit, and provides multi-level stable voltage or current for an earth load; the transmitting bridge circuit comprises an a-phase p bridge arm, an a-phase n bridge arm, a B-phase p bridge arm and a B-phase n bridge arm, each bridge arm comprises a plurality of SM submodules connected in series, a connection point of the two bridge arms of the a-phase p bridge arm and the a-phase n bridge arm is used as an alternating current output end A, a connection point of the two bridge arms of the B-phase p bridge arm and the two bridge arms of the B-phase n bridge arm is used as an alternating current output end B, two points of the alternating current output end A and the alternating current output end BABAnd is connected with the earth load through a lead.
The structure of the modular multilevel transmission bridge proposed by the present invention is shown in fig. 2, and the transmission bridge comprises 4N half-bridge sub-modules (SM) and loads R and L. The basic framework of the transmitting bridge circuit is that an a phase and a b phase are connected in parallel, each phase is formed by connecting a p bridge arm and an n bridge arm in series, 4 bridge arms are provided in total, and the p bridge arm, the n bridge arm, the p bridge arm and the n bridge arm of the b phase including the a phase are respectively represented as ap, an, bp and bn. Each bridge arm is formed by connecting N SM submodules in series, and the SM submodules of the a-phase p-bridge arm are respectively SMa1、SMa2、...、SMaNThe SM submodules of the a-phase n bridge arm are respectively SM1a、SM2a、...、SMNaThe SM submodules of the b-phase p bridge arm are respectively SMb1、SMb2、...、SMbNThe SM submodules of the b-phase n bridge arm are respectively SM1b、SM2b、...、SMNb. and the connection point of the two bridge arms of the a-phase p bridge arm and the a-phase n bridge arm is used as an alternating current output end A, and the connection point of the two bridge arms of the B-phase p bridge arm and the B-phase n bridge arm is used as an alternating current output end B. A. The two points B are used as the output ends of the transmitting bridge circuit and are connected with an earth load (R is an earth resistive load, and L is an earth inductive load) through a lead.
The SM submodule topological structure provided by the invention is shown in FIG. 3, and mainly comprises 2 IGBT switching devices S1, an IGBT switching device S2, a freewheeling diode D1, a freewheeling diode D2 and a capacitor C. IGBT switchDevice S1And a freewheeling diode D1Parallel, IGBT switching device S2And a freewheeling diode D2And the two are connected in parallel, and then connected in parallel with the capacitor C after being connected in series. IGBT switching device S2And IGBT switching device S1M, IGBT switching device S2The other end point is P. M, P serve as external ports for the half-bridge sub-modules.
Fig. 1 is a block diagram of a high-voltage electromagnetic emission system. The generator generates 380V and 50Hz three-phase alternating current, and stable direct current voltage of about 500V is obtained through a three-phase rectifier bridge and an isolated DC/DC converter and is used as direct current bus voltage at the input side of the transmitting bridge circuit. The transmitting bridge circuit adopts an MMC topological structure, the driving circuit provides driving signals for the IGBTs in each SM submodule of the transmitting bridge circuit, and the transmitting bridge circuit provides multi-level stable voltage or current for an earth load so as to meet the requirement of forming a primary magnetic field of electromagnetic detection.
See fig. 2 for a modular multilevel transmit bridge architecture. N is a radical ofapAnd NanThe number of sub-modules for the two bridge arms of the a-phase p bridge arm and the a-phase N bridge arm, NbpAnd NbnThe number of sub-modules for inputting two bridge arms of a b-phase p bridge arm and a b-phase n bridge arm is UAIs the voltage at A point of the a-phase AC output, UBIs the voltage at B point of the B AC output terminal, UABThe voltage output by the transmitting bridge is applied across the earth load. At any time, the number of half-bridge sub-modules which are put into a phase and a phase is N, namely
Npa+Nna＝Npb+Nnb＝N (1)
UdFor inputting side DC voltage, N sub-module capacitor blocks inputted to each phase are connected in series for voltage division, and the capacitor voltage UCIs composed of
Figure BDA0002762499180000071
Fig. 3 is a SM sub-module topology. U shapeSMFor sub-module port voltage, UCFor capacitor voltage, by switching devices S on or off IGBT1IGBT switching device S2So that each submodule can workIn the on or off state, the relationship between the sub-module port voltage and the switch state is shown in table 1. IGBT switching device S1Conducting IGBT switching device S2When the module is turned off, the sub-module works in the on state, and the voltage U of the sub-module portSM＝UC(ii) a IGBT switching device S1Turn-off, IGBT switching device S2When the module is conducted, the sub-module works in a cut-off state, and the voltage U of the sub-module port SM0. The relationship between the port voltage and the switch state of the SM submodule is shown in the table 1(1 represents that the switch tube is conducted, and 0 represents that the switch tube is turned off).
TABLE 1 SM submodule port Voltage to switch State relationship
USM S1 S2
0 0 1
UC 1 0
The realization method of the invention is as follows:
fig. 4 is an equivalent model of a modular multilevel transmit bridge. IGBT switching device S of each SM submodule1IGBT switching device S2Can be equivalent to a change-over switch S connected with a suspension capacitor C in parallel, each SM submodule can be equivalent to the parallel connection of the change-over switch S and the suspension capacitor C, and the transmitting bridge routes 4N SM submodulesAnd forming a module equivalent circuit. The equivalent circuit of the transmitting bridge circuit has 4N switching switches S including a-phase SMa1、SMa2、...、SMaNChange-over switch S for submodulesa1、Sa2、...、SaNPhase a SM1a、SM2a、...、SMNaChange-over switch S for submodules1a、S2a、...、SNaB phase SMb1、SMb2、...、SMbNChange-over switch S for submodulesb1、Sb2、...、SbNB phase SM1b、SM2b、...、SMNbChange-over switch S for submodules1b、S2b、...、SNb. By controlling the change-over switch S of each SM submodule, the SM submodule can be controlled to be in a switching-in state or a switching-off state. When the SM submodule works in an on state, the voltage of the submodule port is UC(ii) a When the submodule works in the cutting-off state, the voltage of the submodule port is 0. SM submodule capacitor voltage U with each bridge arm voltage as inputCThe sum of the series connection, the potential at the point A and the point B and the output voltage are
Figure BDA0002762499180000081
By controlling the equivalent change-over switch S of each SM submodule and setting the number of bridge arms connected into the series SM submodules, multi-level output can be realized. Output voltage UABThe relationship between the number of SM charged into each arm is shown in table 2.
TABLE 2 relationship between output voltage and input SM number of each bridge arm
Figure BDA0002762499180000082
The multi-level output waveform is shown in FIG. 5, the output voltage UABIn the range of [ -U [ - ]d，Ud]There are N-1 levels in total, and the levels are output in order within one period T, respectively
Figure BDA0002762499180000083
Figure BDA0002762499180000084
The method comprises the following implementation steps:
(1) in that
Figure BDA0002762499180000091
In the time period, 0 SM submodule is put into an a-phase p bridge arm, N SM submodules are put into an a-phase N bridge arm, N SM submodules are put into a B-phase p bridge arm, 0 SM submodule is put into a B-phase N bridge arm, the potential of a point A is 0, and the potential of a point B is NUCAt an emission voltage of
UAB＝UA-UB＝-NUC＝-Ud (4)
(2) In that
Figure BDA0002762499180000092
In the time period, a phase p bridge arm is put into 1 SM submodule, a phase N bridge arm is put into N-1 SM submodule, a phase p bridge arm is put into N-1 SM submodule, a phase N bridge arm is put into 1 SM submodule, and the potential of the point A is UCThe potential at the point B is (N-1) UCOutput voltage of
Figure BDA0002762499180000093
(3) In that
Figure BDA0002762499180000094
In the time period, an a-phase p bridge arm is put into 2 SM submodules, an a-phase N bridge arm is put into N-2 SM submodules, a b-phase p bridge arm is put into N-2 SM submodules, a b-phase N bridge arm is put into 2 SM submodules, and the potential of the point A is 2UCThe potential at the point B is (N-2) UCOutput voltage of
Figure BDA0002762499180000095
(4) In that
Figure BDA0002762499180000096
In the time period, an a-phase p bridge arm is put into N-2 SM submodules, an a-phase N bridge arm is put into 2 SM submodules, a b-phase p bridge arm is put into 2 SM submodules, a b-phase N bridge arm is put into N-2 SM submodules, and the potential of the point A is UCThe potential at the point B is (N-1) UCOutput voltage of
Figure BDA0002762499180000097
(5) In that
Figure BDA0002762499180000098
In the time period, an a-phase p bridge arm is put into N-1 SM submodules, an a-phase N bridge arm is put into 1 SM submodule, a b-phase p bridge arm is put into 1 SM submodule, a b-phase N bridge arm is put into N-1 SM submodules, and the potential of the point A is UCThe potential at the point B is (N-1) UCOutput voltage of
Figure BDA0002762499180000099
(4) In that
Figure BDA00027624991800000910
In the time period, an a-phase p bridge arm is put into N SM submodules, an a-phase N bridge arm is put into 0 SM submodules, a b-phase p bridge arm is put into 0 SM submodules, a b-phase N bridge arm is put into N SM submodules, and the potential of an A point is NUcThe potential at point B is 0, and the output voltage is
UAB＝UA-UB＝NUC＝Ud (9)
(5) In that
Figure BDA0002762499180000101
Within a time period of each
Figure BDA0002762499180000102
In a time period, the total number of input submodules of each phase of two bridge arms is ensured to be N, the number of the respective SM input submodules of the two phases of p and N bridge arms is adjusted, and a voltage U is outputABCan realize
Figure BDA0002762499180000103
To
Figure BDA0002762499180000104
Similar to the above process, the segmentation output of (1) will not be described in detail herein.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (5)

1. A modular multilevel high voltage electromagnetic transmit circuit, the circuit comprising:
the generator generates 380V and 50Hz three-phase alternating current;
obtaining stable direct current voltage of about 500V as direct current bus voltage at the input side of the transmitting bridge circuit through a three-phase rectifier bridge and an isolated DC/DC converter;
the transmitting bridge circuit adopts an MMC topological structure, adopts a driving circuit to provide a driving signal for the transmitting bridge circuit, and provides multi-level stable voltage or current for an earth load; the transmitting bridge circuit comprises an a-phase p bridge arm, an a-phase n bridge arm, a B-phase p bridge arm and a B-phase n bridge arm, each bridge arm comprises a plurality of SM submodules connected in series, a connection point of the two bridge arms of the a-phase p bridge arm and the a-phase n bridge arm is used as an alternating current output end A, a connection point of the two bridge arms of the B-phase p bridge arm and the two bridge arms of the B-phase n bridge arm is used as an alternating current output end B, two points of the alternating current output end A and the alternating current output end BABAnd is connected with the earth load through a lead.
2. The circuit of claim 1, wherein the SM sub-module topology comprises an IGBT switching device S1, an IGBT switching device S2, a freewheeling diode D1, a freewheeling diode D2, and a capacitor C, the IGBT switching device S1 is connected in parallel with the freewheeling diode D1, the IGBT switching device S2 is connected in parallel with the freewheeling diode D2, the IGBT switching device S2 and the freewheeling diode D2 are connected in series and then connected in parallel with the capacitor C, a connection point M between the IGBT switching device S2 and the IGBT switching device S1 is provided, the other end point of the IGBT switching device S2 is a connection point P, and the connection point M and the connection point P serve as external ports of the half-bridge sub-module.
3. The circuit of claim 2, wherein the IGBT switching device S1 and the IGBT switching device S2 are driven by a drive circuit.
4. The circuit of claim 2, wherein the number of SM submodules invested in two phases is N, satisfying: n is a radical ofap+Nan＝Nbp+Nbn＝N NapAnd NanThe number of sub-modules of an a-phase p bridge arm and an a-phase N bridge arm SM is NbpAnd NbnThe number of the sub-modules is p bridge arms of a phase b and n bridge arms of a phase b;
ud is input side direct current voltage, N SM submodule capacitor blocks input to each phase are connected in series for voltage division, and the capacitor voltage UC is
Figure FDA0002762499170000021
5. The circuit of claim 1, wherein the transmitter circuit outputs the output voltage U at multiple levelsABIn the range of [ -U [ - ]d，Ud]Ud is input side direct current voltage, N-1 levels are totally output, and the levels are output in sequence in one period T, namely
Figure FDA0002762499170000022
Figure FDA0002762499170000023
UdAnd N is the number of SM submodules input by two phases, and the implementation steps are as follows:
in that
Figure FDA0002762499170000024
In the time period, 0 SM submodule is put into an a-phase p bridge arm, N SM submodules are put into an a-phase N bridge arm, N SM submodules are put into a B-phase p bridge arm, 0 SM submodule is put into a B-phase N bridge arm, the potential of a point A is 0, and the potential of a point B is NUCAt an emission voltage of
UAB＝UA-UB＝-NUC＝-Ud
In that
Figure FDA0002762499170000025
In the time period, a phase p bridge arm is put into 1 SM submodule, a phase N bridge arm is put into N-1 SM submodule, a phase p bridge arm is put into N-1 SM submodule, a phase N bridge arm is put into 1 SM submodule, and the potential of the point A is UCThe potential at the point B is (N-1) UCOutput voltage of
Figure FDA0002762499170000026
In that
Figure FDA0002762499170000027
In the time period, an a-phase p bridge arm is put into 2 SM submodules, an a-phase N bridge arm is put into N-2 SM submodules, a b-phase p bridge arm is put into N-2 SM submodules, a b-phase N bridge arm is put into 2 SM submodules, and the potential of the point A is 2UCThe potential at the point B is (N-2) UCOutput voltage of
Figure FDA0002762499170000028
In that
Figure FDA0002762499170000029
In the time period, an a-phase p bridge arm is put into N-2 SM submodules, an a-phase N bridge arm is put into 2 SM submodules, a b-phase p bridge arm is put into 2 SM submodules, a b-phase N bridge arm is put into N-2 SM submodules, and the potential of the point A is UCThe potential at the point B is (N-1) UCOutput voltage of
Figure FDA0002762499170000031
In that
Figure FDA0002762499170000032
In the time period, an a-phase p bridge arm is put into N-1 SM submodules, an a-phase N bridge arm is put into 1 SM submodule, a b-phase p bridge arm is put into 1 SM submodule, a b-phase N bridge arm is put into N-1 SM submodules, and the potential of the point A is UCThe potential at the point B is (N-1) UCOutput voltage of
Figure FDA0002762499170000033
In that
Figure FDA0002762499170000034
In the time period, an a-phase p bridge arm is put into N SM submodules, an a-phase N bridge arm is put into 0 SM submodules, a b-phase p bridge arm is put into 0 SM submodules, a b-phase N bridge arm is put into N SM submodules, and the potential of an A point is NUcThe potential at point B is 0, and the output voltage is
UAB＝UA-UB＝NUC＝Ud
In that
Figure FDA0002762499170000035
Within a time period of each
Figure FDA0002762499170000036
In a time period, ensuring that the total number of input submodules of each phase of two bridge arms is N, adjusting the number of the respective SM input submodules of the two phases of the p bridge arm and the N bridge arm, and outputting a voltage UABImplementation of
Figure FDA0002762499170000037
To
Figure FDA0002762499170000038
Is output by the segment.
CN202011222330.7A 2020-11-05 2020-11-05 Modularized multi-level high-voltage electromagnetic transmitting circuit Active CN112436746B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011222330.7A CN112436746B (en) 2020-11-05 2020-11-05 Modularized multi-level high-voltage electromagnetic transmitting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011222330.7A CN112436746B (en) 2020-11-05 2020-11-05 Modularized multi-level high-voltage electromagnetic transmitting circuit

Publications (2)

Publication Number Publication Date
CN112436746A true CN112436746A (en) 2021-03-02
CN112436746B CN112436746B (en) 2021-09-21

Family

ID=74695467

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011222330.7A Active CN112436746B (en) 2020-11-05 2020-11-05 Modularized multi-level high-voltage electromagnetic transmitting circuit

Country Status (1)

Country Link
CN (1) CN112436746B (en)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103973147A (en) * 2014-05-31 2014-08-06 吉林大学 Multi-level high-voltage grounded source electromagnetic transmitting circuit
CN104852583A (en) * 2015-04-16 2015-08-19 清华大学 High-frequency link multi-level direct-current transformer used for middle- low-voltage direct current distribution
CN106655841A (en) * 2017-01-13 2017-05-10 昆明理工大学 Novel three-phase current converter topology based on modular multilevel converter
US20170331390A1 (en) * 2015-08-26 2017-11-16 Zhejiang University An lcc and mmc series-connected hvdc system with dc fault ride-through capability
CN108696141A (en) * 2018-06-15 2018-10-23 西安交通大学 A kind of mesolow transformer and its control strategy based on MMC and full bridge structure
CN108832825A (en) * 2018-07-06 2018-11-16 华北电力大学 A kind of multiport electric power electric transformer topology of high power density
CN109167364A (en) * 2018-11-09 2019-01-08 浙江大学 The three port flexibility multimode switching devices based on bridge arm multiplexing and Mixed cascading
CN109217687A (en) * 2018-08-24 2019-01-15 南京理工大学 Power distribution network electric power electric transformer and its control method based on MMC
CN109756121A (en) * 2018-12-24 2019-05-14 中国电力科学研究院有限公司 A kind of isolated form DC-DC DC converter and control method based on MMC

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103973147A (en) * 2014-05-31 2014-08-06 吉林大学 Multi-level high-voltage grounded source electromagnetic transmitting circuit
CN104852583A (en) * 2015-04-16 2015-08-19 清华大学 High-frequency link multi-level direct-current transformer used for middle- low-voltage direct current distribution
US20170331390A1 (en) * 2015-08-26 2017-11-16 Zhejiang University An lcc and mmc series-connected hvdc system with dc fault ride-through capability
CN106655841A (en) * 2017-01-13 2017-05-10 昆明理工大学 Novel three-phase current converter topology based on modular multilevel converter
CN108696141A (en) * 2018-06-15 2018-10-23 西安交通大学 A kind of mesolow transformer and its control strategy based on MMC and full bridge structure
CN108832825A (en) * 2018-07-06 2018-11-16 华北电力大学 A kind of multiport electric power electric transformer topology of high power density
CN109217687A (en) * 2018-08-24 2019-01-15 南京理工大学 Power distribution network electric power electric transformer and its control method based on MMC
CN109167364A (en) * 2018-11-09 2019-01-08 浙江大学 The three port flexibility multimode switching devices based on bridge arm multiplexing and Mixed cascading
CN109756121A (en) * 2018-12-24 2019-05-14 中国电力科学研究院有限公司 A kind of isolated form DC-DC DC converter and control method based on MMC

Also Published As

Publication number Publication date
CN112436746B (en) 2021-09-21

Similar Documents

Publication Publication Date Title
Rao et al. New multilevel inverter topology with reduced number of switches using advanced modulation strategies
CN104092399A (en) Standard Z source three-level T-shaped inverter and SVPWM method thereof
CN109149986B (en) Three-level-like hybrid modular multilevel converter and control method thereof
CN104092400A (en) Z-source three-level T-type inverter and modulating method thereof
CN111490695B (en) Single-stage low-voltage stress switch capacitance type multi-level inverter topology structure and level modulation method
CN105305861A (en) Cascaded multilevel inverter
CN204031005U (en) The T-shaped inverter of a kind of Z source three level
CN111327220B (en) Multi-level inverter for improving utilization rate of direct-current voltage and electric energy conversion equipment
CN111934558A (en) Implementation scheme of novel medium-high voltage variable frequency speed control system without transformer isolation
CN112436746B (en) Modularized multi-level high-voltage electromagnetic transmitting circuit
CN110061645B (en) High-voltage flexible direct-current device with reduced capacitance
CN111541370A (en) Flexible direct current transmission DC/DC converter for true and false bipolar interconnection
CN106208131A (en) Access for new forms of energy and the Multilevel Inverters topological structure of active distribution network
Al-Atbee et al. A cascade multi-level inverter topology with reduced switches and higher efficiency
CN114977859B (en) Three-phase N-module cascading type unidirectional energy flow multi-level frequency converter and control method
CN107465358B (en) Single-phase five-level converter and modulation method adopted by same
CN113839575B (en) Boost seven-level inverter with three-time voltage gain
CN212850283U (en) Novel medium-high voltage variable frequency speed control system without transformer isolation
Raj et al. Nine-level inverter with lesser number of power semiconductor switches using dSPACE
Kumar et al. An approach of hybrid modulation in fusion seven-level cascaded multilevel inverter accomplishment to IM drive system
Yousuf et al. The comparative THD analysis of neutral clamped multilevel Z-source inverter using novel PWM control techniques
Swaroop et al. A Review on recent advancements in multilevel inverter topologies with reduced number of power switch
CN205945092U (en) Distributed generator circuit that is incorporated into power networks based on mix many level converter
Vinodkumar et al. Modeling of new multilevel inverter topology with reduced number of power electronic components
KR101718303B1 (en) Multi-level inverter using a single input source and series-parallel combination of battery

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant