CN105897019A - Equality constraint based modular multilevel converter (MMC) automatic voltage sharing topology - Google Patents
Equality constraint based modular multilevel converter (MMC) automatic voltage sharing topology Download PDFInfo
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- CN105897019A CN105897019A CN201610354612.XA CN201610354612A CN105897019A CN 105897019 A CN105897019 A CN 105897019A CN 201610354612 A CN201610354612 A CN 201610354612A CN 105897019 A CN105897019 A CN 105897019A
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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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Abstract
The invention provides an equality constraint based modular multilevel converter (MMC) automatic voltage sharing topology. The MMC automatic voltage sharing topology is built by combining an MMC topology and an automatic voltage sharing auxiliary circuit, wherein the MMC topology can be in forms of a semi-bridge sub-module, a full-bridge sub-module and a full-bridge and semi-bridge hybrid sub-module, the automatic voltage sharing auxiliary circuit comprises a diode and a wire and forms the equality constraint based MMC automatic voltage sharing topology with the MMC topology by a corresponding combination mode. The MMC automatic voltage sharing topology is not dependent on sequencing voltage sharing control; for the i(th) sub-module of each bridge arm, the value of i is 1-N; the greater of the serial number of the i is, the more priority the sub-module is charged according to the current direction of the bridge arm; the switching and removal operation is carried out on the sub-module according to a principle of discharging in priority if the serial number of the i is smaller, so that the capacitance voltage of the sub-module below each bridge arm is not lower than the capacitance voltage of the sub-module above each bridge arm; and the capacitance voltage balance of the sub-module can be achieved on the basis of completing AC-DC energy conversion by the effect of the automatic voltage sharing auxiliary circuit.
Description
Technical field
The present invention relates to flexible direct-current transmission field, be specifically related to a kind of MMC based on equality constraint from all pressing topology.
Background technology
Modularization multi-level converter MMC is the developing direction of following HVDC Transmission Technology, MMC uses submodule (Sub-module, SM) mode cascaded constructs converter valve, avoid the direct series connection of big metering device, reduce requirement conforming to device, simultaneously facilitate dilatation and redundant configuration.Along with the rising of level number, output waveform, close to sinusoidal, can effectively avoid the defect of low level VSC-HVDC.
Half-bridge MMC is combined by half-bridge submodule, and half-bridge submodule is made up of 2 IGBT module, 1 sub-module capacitance, 1 IGCT and 1 mechanical switch, and low cost, running wastage is little.
Different from two level, three level VSC, the DC voltage of half-bridge MMC is not supported by a bulky capacitor, but is supported by a series of separate suspension submodule capacitances in series.In order to ensure that the waveform quality that AC voltage exports bears identical stress with each power semiconductor in guarantee module, also for preferably supporting DC voltage, reduce alternate circulation, it is necessary to assure submodule capacitor voltage is in the state of dynamic stability at the periodic current disorder of internal organs of brachium pontis power.
Sequence based on capacitance voltage sequence all presses algorithm to be to solve the main flow thinking of half-bridge submodule capacitor voltage equalization problem in half-bridge MMC at present, the good all pressures effect of this scheme can be verified in emulation and practice, but is also constantly expose its some inherent shortcomings.First, the realization of ranking function has to rely on the Millisecond sampling of capacitance voltage, needs substantial amounts of sensor and optical-fibre channel to be coordinated；Secondly, when half-bridge submodule number increases, the operand of capacitance voltage sequence increases rapidly, and the hardware designs for controller brings huge challenge；Additionally, submodule is cut-off frequency and has the highest requirement by sequence all realizations of pressure algorithm, cut-off frequency and be closely related with all pressure effects, in real process, probably due to all press the restriction of effect, it has to improve the triggering frequency of submodule, and then bring the increase that inverter is lost.
Document " A DC-Link Voltage Self-Balance Method
for a Diode-Clamped Modular Multilevel Converter With Minimum Number of Voltage
Sensors ", it is proposed that a kind of rely on clamp diode and transformator to realize MMC submodule capacitor voltage equilibrium thinking.But the program is to a certain degree destroying the modular nature of submodule, the transformator of introducing makes that cost is higher, loss is relatively big, and reliability reduces, and increases the transformation difficulty of system to a certain extent.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of economy, the MMC all pressed that is independent of sorting from the most all pressing topology.
The constituted mode that the present invention is concrete is as follows.
A kind of MMC based on equality constraint is from all pressing topology, and including the MMC topological sum being made up of A, B, C three-phase from all pressing auxiliary circuit, A, B, C three-phase of MMC is respectively by 2NIndividual submodule, 2 brachium pontis reactors are in series；The most all pressures auxiliary circuit of A, B, C three-phase comprises 2 respectivelyN-1 clamp diode.
Above-mentioned MMC based on equality constraint is from all pressing topology, and MMC topology can be mixed by half-bridge submodule, full-bridge submodule or half full-bridge submodule and form；When using half-bridge submodule: the 1st submodule of brachium pontis in A phase, its submodule electric capacity negative pole is connected midpoint with two IGBT of the 2nd submodule of brachium pontis in A phase downwards and is connected, and two IGBT of its submodule connect midpoint and are upwards connected with dc bus positive pole；In A phase the of brachium pontisiIndividual submodule, whereiniValue be 2～N-1, its submodule electric capacity negative pole is downwards with in A phase the of brachium pontisiTwo IGBT of+1 submodule connect midpoints and are connected, and two IGBT of its submodule connect midpoints upwards with in A phase the of brachium pontisi-1 sub-module capacitance negative pole is connected；In A phase the of brachium pontisNIndividual submodule, its submodule electric capacity negative pole is connected midpoint down through two IGBT of the 1st submodule of two brachium pontis reactors and A phase lower brachium pontis and is connected, and two IGBT connection midpoints of its submodule are upwards with in A phase the of brachium pontisN-1 sub-module capacitance negative pole is connected；The of the lower brachium pontis of A phaseiIndividual submodule, whereiniValue be 2～N-1, its submodule electric capacity negative pole downwards with the of A phase time brachium pontisiTwo IGBT of+1 submodule connect midpoints and are connected, and two IGBT of its submodule connect the of midpoints upwards brachium pontis lower with A phasei-1 sub-module capacitance negative pole is connected；The of the lower brachium pontis of A phaseNIndividual submodule, its submodule electric capacity negative pole is connected with dc bus negative pole downwards, and two IGBT of its submodule connect the of midpoints upwards brachium pontis lower with A phaseN-1 sub-module capacitance negative pole is connected；B phase, C phase connected mode similar with A；When using full-bridge submodule: the 1st submodule of brachium pontis in A phase, two IGBT module junction points outside it are connected with dc bus positive pole, and the junction point of two IGBT module of inner side is connected with the junction point of two IGBT module in the outside of the 2nd submodule of brachium pontis in A phase downwards；In A phase the of brachium pontisiIndividual submodule, whereiniValue be 2～N-1, the junction point of two IGBT module outside it is upwards with in A phase the of brachium pontisiThe junction point of two IGBT module of the inner side of-1 submodule is connected, and the junction point of two IGBT module of inner side is downwards with in A phase the of brachium pontisiThe junction point of two IGBT module in the outside of+1 submodule is connected；In A phase the of brachium pontisNIndividual submodule, the junction point of two IGBT module outside it is upwards with in A phase the of brachium pontisNThe junction point of two IGBT module of the inner side of-1 submodule is connected, and the junction point of two IGBT module of inner side is connected down through the junction point of two IGBT module in the outside of the 1st submodule of the lower brachium pontis of two brachium pontis reactors and A phase；The of the lower brachium pontis of A phaseiIndividual submodule, whereiniValue be 2～N-1, as the submodule connected mode corresponding with brachium pontis in A phase；The of the lower brachium pontis of A phaseNIndividual submodule, the junction point of two IGBT module outside it is upwards with in A phase the of brachium pontisNThe junction point of two IGBT module of the inner side of-1 submodule is connected, and the junction point downward dc bus negative pole of two IGBT module of inner side is connected；The connected mode of half full-bridge mixing MMC is that both topologys are together in series.
The adjacent submodule capacitance cathode of upper and lower bridge arm in mutually, from the most all pressing topology, is coupled together by diode by above-mentioned MMC based on equality constraint from the most all pressure auxiliary circuits, in opposite direction from positive pole to negative pole of direction that diode forward turns on and submodule capacitor voltage.A mechanical switch can be added between diode and electric capacity, when this module failure, mechanical switch is opened, with isolated fault submodule.
Accompanying drawing explanation
Fig. 1 is that half-bridge MMC is from all pressing topology；
Fig. 2 is that full-bridge MMC is from all pressing topology；
Fig. 3 is that half full-bridge mixing MMC is from all pressing topology.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is clearly and completely described.
With reference to Fig. 1, a kind of MMC based on equality constraint from all pressing topology, including the MMC topological sum being made up of A, B, C three-phase from all pressing auxiliary circuit, A, B, C three-phase of MMC is respectively by 2NIndividual submodule, 2 brachium pontis reactors are in series；The most all pressures auxiliary circuit of A, B, C three-phase comprises 2 respectivelyN-1 clamp diode.Effects of other switches in figure are that submodule excises this module when breaking down.
From the triggering mode the most all pressing topology, this is divided into two kinds, and the first is: for the of each brachium pontisiIndividual submodule,iValue be 1～N, according toiSequence number the biggest, the principle the most preferentially charged carries out submodule and puts into excision operation: the definition positive extreme direction of dc bus is top, and negative pole direction is lower section；For half-bridge MMC topology, the when of being positive in bridge arm current direction, the submodule number put into as required, preferentially the submodule from the bottom of brachium pontis starts to put into, and starts excision from the submodule on brachium pontis top；In bridge arm current direction for the when of negative, preferentially the submodule from the top of brachium pontis starts to put into, and starts excision from the submodule of brachium pontis bottom；Formulate two kinds of inputs, excision rule when triggering, do corresponding switching according to bridge arm current direction and can realize the excision requirement of above-mentioned input；Under the effect all pressing auxiliary circuit, as a example by two adjacent submodules: when the submodule of bottom is in excision state, if the submodule that capacitance voltage is adjacent higher than top, so diode between the capacitance cathode of the adjacent submodule of the two will turn on, the two electric capacity is now equivalent to parallel connection, until the submodule capacitor voltage on top is not less than the submodule capacitor voltage of bottom, the effect the most all pressed within this every phase submodule can reach the effect of the submodule capacitor voltage the most adjacent little submodule capacitor voltage of bottom, in conjunction with lower floor's submodule preferentially charge triggering logic, can realize from all pressing；A phase upper and lower bridge arm submodule capacitor voltage under this triggering mode, under the effect of equalizer circuit, meets and descends column constraint: U C au_1≥U C au_2…≥U C au_N ≥U C al_1≥U C al_2…≥U C al_N ；In view of according toiSequence number the biggest, the principle the most preferentially charged carries out submodule and puts into excision operation, thus can guarantee that:U C au_1≤U C au_2…≤U C au_N ,U C al_1≤U C al_2…≤U C al_N , thus obtainU C au_1=U C au_2…=U C au_N ,U C al_1=U C al_2…=U C al_N ；The submodule number simultaneously put into due to upper and lower bridge arm isN, it is equivalent to thisNIndividual sub-module capacitance is directly connected on dc bus, so thisNIndividual submodule capacitor voltage sum is equal with DC bus-bar voltage, due to the situation that in each power frequency period, once up or down brachium pontis all puts into, in conjunction with constraints recited above, obtains the equation and retrains:U C au_1=U C au_2…=U C au_N =U C al_1=U C al_2…=U C al_N ；Thus realize the capacitance voltage equilibrium between each submodule；The most all pressures constraints of B, C phase is consistent with A phase.
The second is: is separated by several submodules when of triggering each submodule and triggers, when bridge arm current is positive when, the submodule quantity put into as required, first put into the submodule of brachium pontis bottom, put into the submodule being separated by several with it the most again, put into operation so on up to by the first of this brachium pontis submodule, the quantity being separated by submodule increases along with the quantity of the submodule put into operation and gradually decreases, then remaining submodule is put into according still further to submodule sequence number order from big to small, first submodule is preferentially excised the when of excision, excision is separated by several submodule with it the most again, until excising remaining submodule according still further to submodule sequence number order from small to large after being excised by last submodule；When bridge arm current is for the when of negative, the submodule quantity put into as required, first put into the submodule of brachium pontis the top, put into the submodule being separated by several with it the most again, put into operation so on up to by last submodule of this brachium pontis, the quantity being separated by submodule increases along with the quantity of the submodule put into operation and gradually decreases, then remaining submodule is put into according still further to submodule sequence number order from small to large, last submodule is preferentially excised the when of excision, excision is separated by several submodule with it the most again, until remaining submodule will be excised according still further to submodule sequence number order from big to small after the excision of first submodule；The mode that can take additional isolation power supply for last submodule carries out voltage stabilizing control to it.
For half full-bridge mixing MMC shown in the full-bridge shown in Fig. 2 or Fig. 3, not considering full-bridge submodule negative input when, put into consistent with half-bridge MMC with excision rule and the most all pressure principles, cannot be carried out the when of input owing to full-bridge is negative from all pressing, so switch transistor T being disconnected, with isolation from the most all pressing auxiliary circuit when full-bridge negative input.
Finally should be noted that: described embodiment is only some embodiments of the present application rather than whole embodiments.Based on the embodiment in the application, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of the application protection.
Claims (5)
1. a MMC based on equality constraint is from all pressing topology, it is characterised in that: the MMC topological sum being made up of A, B, C three-phase forms from all pressure auxiliary circuits, and A, B, C three-phase of MMC is respectively by 2NIndividual submodule, 2 brachium pontis reactors are in series；The most all pressures auxiliary circuit of A, B, C three-phase respectively comprises 2N-1 clamp diode.
A kind of MMC based on equality constraint the most according to claim 1 is from all pressing topology, it is characterised in that: the MMC topology being made up of A, B, C three-phase can be made up of forms such as half-bridge, full-bridge, half full-bridge mixing.
MMC based on equality constraint the most according to claim 1 is from all pressing topology, it is characterized in that: coupled together by diode by the adjacent submodule capacitance cathode of each phase from the most all pressure auxiliary circuits, direction and the submodule capacitor voltage that diode forward turns on is by opposite direction to negative pole of positive pole.
A kind of MMC based on equality constraint the most according to claim 1 is from the most all pressing topology, it is characterised in that: the triggering mode of submodule is divided into two kinds, and the first is: for the of each brachium pontisiIndividual submodule,iValue be 1～N, when bridge arm current is positive when, formulate one and trigger logic, according toiSequence number the biggest, the most preferentially put into,iSequence number the least, the most preferentially excision principle trigger；When bridge arm current is for the when of negative, formulates one and trigger logic, according toiSequence number the biggest, the most preferentially excise,iSequence number the least, the most preferential the commitment principle triggers；Here the definition being positive to bridge arm current is when submodule puts into operation, and submodule electric capacity is in charged state, and the definition that bridge arm current is negative is when submodule puts into operation, and submodule electric capacity is in discharge condition；The second is: is separated by several submodules when of triggering each submodule and triggers, when bridge arm current is positive when, the submodule quantity put into as required, first put into the submodule of brachium pontis bottom, put into the submodule being separated by several with it the most again, put into operation so on up to by the first of this brachium pontis submodule, the quantity being separated by submodule increases along with the quantity of the submodule put into operation and gradually decreases, then remaining submodule is put into according still further to submodule sequence number order from big to small, first submodule is preferentially excised the when of excision, excision is separated by several submodule with it the most again, until excising remaining submodule according still further to submodule sequence number order from small to large after being excised by last submodule；When bridge arm current is for the when of negative, the submodule quantity put into as required, first put into the submodule of brachium pontis the top, put into the submodule being separated by several with it the most again, put into operation so on up to by last submodule of this brachium pontis, the quantity being separated by submodule increases along with the quantity of the submodule put into operation and gradually decreases, then remaining submodule is put into according still further to submodule sequence number order from small to large, last submodule is preferentially excised the when of excision, excision is separated by several submodule with it the most again, until remaining submodule will be excised according still further to submodule sequence number order from big to small after the excision of first submodule；The mode that can take additional isolation power supply for last submodule carries out voltage stabilizing control to it.
A kind of MMC based on equality constraint the most according to claim 1 is from all pressing topology, it is characterized in that: the when of using triggering mode one, in each submodule input, by-pass procedure, A phase upper and lower bridge arm submodule capacitor voltage, under the effect of equalizer circuit, meets and descends column constraint: U C au_1≥U C au_2…≥U C au_N ≥U C al_1≥U C al_2…≥U C al_N ；In view of according toiSequence number the biggest, the principle the most preferentially charged carries out submodule and puts into excision operation:U C au_1≤U C au_2…≤U C au_N ,U C al_1≤U C al_2…≤U C al_N , obtainU C au_1=U C au_2…=U C au_N ,U C al_1=U C al_2…=U C al_N ；The submodule number simultaneously put into due to upper and lower bridge arm isN, it is equivalent to thisNIndividual sub-module capacitance is directly connected on dc bus, so thisNIndividual submodule capacitor voltage sum is equal with DC bus-bar voltage, due to the situation that in each power frequency period, once up or down brachium pontis all puts into, in conjunction with constraints recited above, obtains the equation and retrains:U C au_1=U C au_2…=U C au_N =U C al_1=U C al_2…=U C al_N ；Thus realize the capacitance voltage equilibrium between each submodule；B, C phase from balancer reason identical with A phase.
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| CN106602912A (en) * | 2017-01-10 | 2017-04-26 | 华北电力大学（保定） | Capacitance and voltage self-ordering modular multilevel converter |
| CN108429477A (en) * | 2018-02-02 | 2018-08-21 | 华北电力大学 | A kind of MMC submodules optimization method for equalizing voltage based on double half-bridges and full-bridge mixing in parallel |
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| CN106452147A (en) * | 2016-11-21 | 2017-02-22 | 西安交通大学 | Three-phase symmetric topology for self-balance of capacitor voltage of MMC (Modular Multilevel Converter) module |
| CN106452147B (en) * | 2016-11-21 | 2019-02-05 | 西安交通大学 | A kind of topology of oneself equilibrium of the MMC module capacitance voltage of three-phase symmetrical |
| CN106602912A (en) * | 2017-01-10 | 2017-04-26 | 华北电力大学（保定） | Capacitance and voltage self-ordering modular multilevel converter |
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| WO2018221907A1 (en) * | 2017-06-02 | 2018-12-06 | 효성중공업 주식회사 | Mmc converter and sub-modules thereof |
| CN108429477A (en) * | 2018-02-02 | 2018-08-21 | 华北电力大学 | A kind of MMC submodules optimization method for equalizing voltage based on double half-bridges and full-bridge mixing in parallel |
| CN108471249A (en) * | 2018-04-17 | 2018-08-31 | 西安交通大学 | A kind of MMC module capacitances voltage based on clamp diode is topological from equilibrium |
| CN108574288A (en) * | 2018-05-31 | 2018-09-25 | 湖南五凌电力科技有限公司 | The pressure method for handover control of capacitance in a kind of voltage-type high-voltage reactive generator |
| CN108574288B (en) * | 2018-05-31 | 2021-06-25 | 湖南五凌电力科技有限公司 | Voltage-sharing switching control method for capacitor in voltage type high-voltage reactive generator |
| CN111342687A (en) * | 2018-12-19 | 2020-06-26 | 南京南瑞继保工程技术有限公司 | Cascaded full-bridge multi-level converter topology with self-voltage-sharing characteristic and control method |
| CN110649833A (en) * | 2019-09-03 | 2020-01-03 | 昆明理工大学 | MMC topological structure with interphase bidirectional self-voltage-sharing capability |
| US11476774B2 (en) | 2020-06-01 | 2022-10-18 | Delta Electronics (Shanghai) Co., Ltd. | Control method and control system for modular multilevel converter and power transmission system |
| US11476773B2 (en) | 2020-06-01 | 2022-10-18 | Delta Electronics (Shanghai) Co., Ltd. | Control method and control system for modular multilevel converter and power transmission system |
| TWI796697B (en) * | 2020-06-01 | 2023-03-21 | 大陸商台達電子企業管理（上海）有限公司 | Control method and control system for modular multilevel converter and power transmission system |
| TWI800837B (en) * | 2020-06-01 | 2023-05-01 | 大陸商台達電子企業管理（上海）有限公司 | Control method and control system for modular multilevel converter and power transmission system |
| CN112134477A (en) * | 2020-09-14 | 2020-12-25 | 湖南大学 | Frequency reduction control method of modular multilevel converter with auxiliary sub-modules |
| CN112134477B (en) * | 2020-09-14 | 2021-07-27 | 湖南大学 | Frequency reduction control method of modular multilevel converter with auxiliary sub-modules |
| CN113872458A (en) * | 2021-09-23 | 2021-12-31 | 南京南瑞继保电气有限公司 | Light modular converter valve and control method thereof |
| CN113872458B (en) * | 2021-09-23 | 2023-08-08 | 南京南瑞继保电气有限公司 | Light modularized converter valve and control method thereof |
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