CN107181419A - A kind of Modularized multi-level converter sub-module electric capacity optimizes method for equalizing voltage - Google Patents

A kind of Modularized multi-level converter sub-module electric capacity optimizes method for equalizing voltage Download PDF

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Publication number
CN107181419A
CN107181419A CN201710416003.7A CN201710416003A CN107181419A CN 107181419 A CN107181419 A CN 107181419A CN 201710416003 A CN201710416003 A CN 201710416003A CN 107181419 A CN107181419 A CN 107181419A
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China
Prior art keywords
voltage
submodule
bridge arm
electric capacity
multiplied
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Pending
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CN201710416003.7A
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Chinese (zh)
Inventor
孙运全
杨晨
刘恩杰
罗青松
刘旭
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Jiangsu University
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Jiangsu University
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Publication of CN107181419A publication Critical patent/CN107181419A/en
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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
    • 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
    • H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
    • 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
    • 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
    • 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)

Abstract

Optimize method for equalizing voltage the invention discloses a kind of Modularized multi-level converter sub-module electric capacity, belong to multilevel converter field and high-voltage dc transmission electrical domain, each bridge arm of modularization multi-level converter is considered as independent control object by this method, the submodule quantity put into as needed for modulated signal determines bridge arm, provide submodule capacitor voltage maximum fluctuation scope, according to bridge arm current direction, the state of capacitance voltage size and submodule previous moment (input is cut off), introduce and keep the factor, update the sequence of submodule capacitor voltage, so as to put into corresponding submodule.The present invention reduces switching frequency, reduction switching loss, obtains satisfactory output voltage waveforms on the premise of ensureing that capacitance voltage obtains good voltage equalizing.

Description

A kind of Modularized multi-level converter sub-module electric capacity optimizes method for equalizing voltage
Technical field
The invention belongs to multilevel converter field and high-voltage dc transmission electrical domain, more particularly to a kind of modular multilevel Transverter submodule electric capacity optimizes method for equalizing voltage.
Background technology
Modularization multi-level converter (MMC) is a kind of novel topological structure, compared with traditional multi-level transverter, is had Modularized design, Redundant Control, harmonic wave of output voltage content are few and with characteristics such as common DC bus.MMC is without to multiple Switching device connection in series-parallel, can just obtain higher voltage and more Large Copacity, in voltage source by way of increasing cascade submodule Type high-voltage dc transmission electrical domain has broad application prospects.2010, the Trans Bay Cable engineerings in the U.S. were first by MMC Technology is applied to D.C. high voltage transmission, and its maximum capacity is 400MVA, and DC bus-bar voltage is ± 200kV.And thrown in 2014 The INELFE project capacity for being used for Power System Interconnection between the France of fortune and Spain is even more to reach 2000MW, DC bus-bar voltage For ± 320kV.
Generally in D.C. high voltage transmission application, DC bus-bar voltage can reach hundreds of kilovolts, so that on each bridge arm Submodule number also has hundreds of.In MMC is normally run, with the change in bridge arm current direction, thrown if submodule is in Enter state, its DC capacitor will be electrically charged or discharge, however by the input moment is different, making time length it is different with And the not quite identical influence of DC capacitor parameter, capacitance voltage can produce fluctuation.Excessive voltage pulsation can influence transverter Normal operation, even result in the damage of transverter.Thus, it is necessary to carry out Pressure and Control to MMC submodules electric capacity, reduce The fluctuation of capacitance voltage.
Ranking method is applied to the MMC Pressure and Control that voltage class is higher, submodule quantity is more.Traditional ranking method electric capacity is equal Press effect good, but switching frequency is very high, adds the loss of transverter.
The content of the invention
For capacitor voltage equalizing and switch in the necessity of MMC submodules capacitor voltage equalizing in background technology and traditional ranking method Contradiction between frequency, the present invention proposes a kind of Modularized multi-level converter sub-module electric capacity optimization method for equalizing voltage, specifically Comprise the following steps：
S1, the submodule quantity N put into as needed for NLM or SPWM modulation calculates bridge armon；
S2, setting submodule capacitor voltage maximum fluctuation coefficient δmax, so that it is determined that capacitance voltage maximum fluctuation scope；
S3, introduces and keeps factor HF1And HF2, wherein HF1＜ 1, HF2＞ 1；The actual sortord of submodule capacitor voltage is Ascending order, according to capacitance voltage size, bridge arm current iarmDirection and the state S of submodule previous momentiTo judge corresponding submodule Capacitance voltage, it is necessary to lifting tagmeme still reduces tagmeme, that is, is multiplied by HF on the basis of actually sequence1Still it is multiplied by HF2, update Capacitance voltage sorts；
S4, sorts according to the capacitance voltage after renewal, if bridge arm current iarmN before ＞ 0, inputonIndividual submodule, if bridge arm Electric current iarmN after ＜ 0, inputonIndividual submodule.
Further, the upper limit of the submodule capacitor voltage maximum fluctuation scope is：UC max=UC+δmaxUC, lower limit is： UC min=UC-δmaxUC, wherein UCFor submodule capacitor voltage rated value.
Further, the state S of the S3 Neutron modules previous momentiIncluding input state and excision state.
Further, in the S3, it is multiplied by HF1Or HF2Concretely comprise the following steps：
S3.1, if submodule capacitor voltage uCiOutside maximum fluctuation scope, then no matter bridge arm current iarmDirection and submodule The state S of previous momentiHow, work as uC＜ UC minWhen, capacitance voltage is multiplied by HF1；Work as uC＞ UC maxWhen, capacitance voltage is multiplied by HF2, wherein i=1,2 ... ..., n；
S3.2, if submodule capacitor voltage uCiIn the range of maximum fluctuation, then need to consider bridge arm current iarmDirection and son The state S of module previous momenti：As bridge arm current iarmDuring ＞ 0, if the submodule previous moment is input state, electric capacity electricity Pressure is multiplied by HF1, otherwise capacitance voltage be multiplied by HF2；As bridge arm current iarmDuring ＜ 0, if the submodule previous moment is input shape State, capacitance voltage is multiplied by HF2, otherwise capacitance voltage be multiplied by HF1。
Further, generally maximum fluctuation coefficient δmaxNo more than 10%.
Beneficial effects of the present invention are：Present invention introduces double holding factors, capacitance voltage maximum fluctuation scope is set, to ripple Capacitance voltage within the scope of dynamic and outside fluctuation range is handled respectively, both can guarantee that good voltage equalizing, and can be reduced and opened Frequency is closed, switching loss is reduced.
Brief description of the drawings
The topology diagram for the modularization multi-level converter that Fig. 1 provides for the present invention；
The topology diagram for the Modularized multi-level converter sub-module that Fig. 2 provides for the present invention；
Fig. 3 optimizes the flow of method for equalizing voltage for a kind of Modularized multi-level converter sub-module electric capacity that the present invention is provided Figure.
Embodiment
The embodiment to the present invention is described in detail below in conjunction with the accompanying drawings：
A kind of Modularized multi-level converter sub-module electric capacity optimization method for equalizing voltage of the present invention, selected module The topological structure for changing multilevel converter is as shown in Figure 1.The topological three-phase is connected in parallel on dc bus two ends respectively, every mutually to include Upper and lower two bridge arms, each bridge arm is composed in series by n cascade submodule (SM) and a bridge arm inductance L, upper and lower bridge arm Midpoint as every phase exchange export.
The topological structure of Modularized multi-level converter sub-module is as shown in Fig. 2 half-H-bridge structure is the typical submodules of MMC Block structure, it carries anti-paralleled diode (D by two1、D2) switch transistor T1、T2With a DC capacitor C composition, control is opened Close pipe T1And T2On off state, you can obtain output voltage 0 or u in output endC。
Modularization multi-level converter output phase voltage is the half of the difference of bridge arm voltage and upper bridge arm voltage under the phase, institute With by changing submodule quantity input in bridge arm, you can the voltage waveform needed for ac output end is obtained.
Fig. 3 optimizes the flow of method for equalizing voltage for a kind of Modularized multi-level converter sub-module electric capacity of the present invention Figure, specifically includes following steps：
(1) submodule put into as needed for nearest level approaches modulation NLM or Sine Pulse Width Modulation calculates bridge arm Quantity Non；
(2) setting submodule capacitor voltage maximum fluctuation coefficient δmax, so that it is determined that capacitance voltage maximum fluctuation scope, its The upper limit is：UC max=UC+δmaxUC, lower limit is：UC min=UC-δmaxUC, wherein UCFor submodule capacitor voltage rated value；For Guarantee transverter is normally run, and obtains preferable output waveform, generally δmaxNo more than 10%；
(3) introduce and keep factor HF1And HF2, wherein HF1<1、HF2>1；The actual sortord of submodule capacitor voltage is Ascending order, if submodule capacitor voltage uCiOutside maximum fluctuation scope, then no matter bridge arm current iarmWhen direction and previous submodule The state S at quarteriHow：Work as uCi<UCminWhen, capacitance voltage is multiplied by HF1, work as uCi>UCmaxWhen, capacitance voltage is multiplied by HF2, (i=1, 2 ... ..., n), it is ensured that the priority that the submodule puts into or cut off, it is ensured that capacitance voltage obtains good voltage equalizing；If sub Module capacitance voltage uCiIn the range of maximum fluctuation, then need to consider bridge arm current iarmDirection and the shape of submodule previous moment State Si(input state and excision state)：As bridge arm current iarm>When 0, if the submodule previous moment is input state (Si= 1), capacitance voltage is multiplied by HF1, otherwise capacitance voltage be multiplied by HF2；As bridge arm current iarm<When 0, if the submodule previous moment is Input state (Si=1), capacitance voltage is multiplied by HF2, otherwise capacitance voltage be multiplied by HF1, capacitance voltage sequence is updated, the son is improved Module maintains the possibility of original state, reduces switching frequency, reduces switching loss；
(4) sorted according to the capacitance voltage after renewal, if bridge arm current iarmN before ＞ 0, inputonIndividual submodule, if bridge arm N after electric current ＜ 0, inputonIndividual submodule.
The present invention is by way of setting submodule capacitor voltage maximum fluctuation scope, to outside maximum fluctuation scope and model Capacitance voltage within enclosing is handled respectively, both can guarantee that good voltage equalizing, and switching frequency can be reduced again.
Described above is only presently preferred embodiments of the present invention, and the present invention is not limited to enumerate above-described embodiment, should said Bright, any those skilled in the art are under the teaching of this specification, all equivalent substitutes for being made, substantially Variant, all falls within the essential scope of this specification, ought to be by present invention protection.

Claims (5)

1. a kind of Modularized multi-level converter sub-module electric capacity optimizes method for equalizing voltage, it is characterised in that this method includes following Step：
S1, the submodule quantity N put into as needed for NLM or SPWM modulation calculates bridge armon；
S2, setting submodule capacitor voltage maximum fluctuation coefficient δmax, so that it is determined that capacitance voltage maximum fluctuation scope；
S3, introduces and keeps factor HF1And HF2, wherein HF1＜ 1, HF2＞ 1；The actual sortord of submodule capacitor voltage is ascending order, According to capacitance voltage size, bridge arm current iarmDirection and the state S of submodule previous momentiTo judge corresponding submodule electric capacity Voltage, it is necessary to lifting tagmeme still reduces tagmeme, that is, is multiplied by HF on the basis of actually sequence1Still it is multiplied by HF2, update electric capacity Voltage sorts；
S4, sorts according to the capacitance voltage after renewal, if bridge arm current iarmN before ＞ 0, inputonIndividual submodule, if bridge arm current iarmN after ＜ 0, inputonIndividual submodule.
2. a kind of Modularized multi-level converter sub-module electric capacity optimization method for equalizing voltage according to claim 1, its feature It is, the upper limit of the submodule capacitor voltage maximum fluctuation scope is：UCmax=UC+δmaxUC, lower limit is：UCmin=UC-δmaxUC, wherein UCFor submodule capacitor voltage rated value.
3. a kind of Modularized multi-level converter sub-module electric capacity optimization method for equalizing voltage according to claim 1, its feature It is, the state S of the submodule previous momentiIncluding input state and excision state.
4. a kind of Modularized multi-level converter sub-module electric capacity optimization method for equalizing voltage according to Claims 2 or 3, it is special Levy and be, in the S3, be multiplied by HF1Or HF2Concretely comprise the following steps：
S3.1, if submodule capacitor voltage uCiOutside maximum fluctuation scope, then no matter bridge arm current iarmDirection and submodule are previous The state S at momentiHow, work as uCi＜ UCminWhen, capacitance voltage is multiplied by HF1；Work as uCi＞ UCmaxWhen, capacitance voltage is multiplied by HF2, its Middle i=1,2 ... ..., n；
S3.2, if submodule capacitor voltage uCiIn the range of maximum fluctuation, then need to consider bridge arm current iarmDirection and submodule The state S of previous momenti：As bridge arm current iarmDuring ＞ 0, if the submodule previous moment is input state, capacitance voltage is multiplied by HF1, otherwise capacitance voltage be multiplied by HF2；As bridge arm current iarmDuring ＜ 0, if the submodule previous moment is input state, electric capacity electricity Pressure is multiplied by HF2, otherwise capacitance voltage be multiplied by HF1。
5. a kind of Modularized multi-level converter sub-module electric capacity optimization method for equalizing voltage according to claim 1, its feature It is, generally maximum fluctuation coefficient δmaxNo more than 10%.
CN201710416003.7A 2017-06-06 2017-06-06 A kind of Modularized multi-level converter sub-module electric capacity optimizes method for equalizing voltage Pending CN107181419A (en)

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Cited By (6)

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Publication number Priority date Publication date Assignee Title
CN108054944A (en) * 2018-01-25 2018-05-18 湖南大学 A kind of 50 electric harmonic generator control methods
CN108736700A (en) * 2018-06-14 2018-11-02 西安理工大学 MMC submodule capacitor voltage static equilibrium control methods during off-network inverter circuit starts
CN109104110A (en) * 2018-09-10 2018-12-28 青岛科技大学 Contrast formula Modular multilevel converter and its control method
CN111600495A (en) * 2019-02-21 2020-08-28 国家电网有限公司 Submodule control method and device of MMC (modular multilevel converter) with damping resistor
CN112953275A (en) * 2021-02-07 2021-06-11 浙江大学 Voltage-sharing control method for reducing modular multilevel converter submodule capacitor voltage fluctuation
CN115549439A (en) * 2022-11-29 2022-12-30 东南大学 MMC (Modular multilevel converter) switching loss optimization method and equipment under low-power operation

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EP3032680A1 (en) * 2014-12-12 2016-06-15 ABB Technology AG Standby and charging of modular multilevel converters
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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108054944A (en) * 2018-01-25 2018-05-18 湖南大学 A kind of 50 electric harmonic generator control methods
CN108054944B (en) * 2018-01-25 2019-05-07 湖南大学 A kind of 50 electric harmonic generator control methods
CN108736700A (en) * 2018-06-14 2018-11-02 西安理工大学 MMC submodule capacitor voltage static equilibrium control methods during off-network inverter circuit starts
CN108736700B (en) * 2018-06-14 2020-07-28 西安理工大学 MMC submodule capacitor voltage static balance control method in off-network inverter circuit starting process
CN109104110A (en) * 2018-09-10 2018-12-28 青岛科技大学 Contrast formula Modular multilevel converter and its control method
CN111600495A (en) * 2019-02-21 2020-08-28 国家电网有限公司 Submodule control method and device of MMC (modular multilevel converter) with damping resistor
CN111600495B (en) * 2019-02-21 2023-04-18 国家电网有限公司 Submodule control method and device of MMC (modular multilevel converter) with damping resistor
CN112953275A (en) * 2021-02-07 2021-06-11 浙江大学 Voltage-sharing control method for reducing modular multilevel converter submodule capacitor voltage fluctuation
CN112953275B (en) * 2021-02-07 2023-11-21 浙江大学 Voltage equalizing control method for reducing capacitance and voltage fluctuation of submodule of modularized multi-level converter
CN115549439A (en) * 2022-11-29 2022-12-30 东南大学 MMC (Modular multilevel converter) switching loss optimization method and equipment under low-power operation

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