CN106953530B - The configuration method of mixed type MMC asymmetry Shuangzi module and half-bridge submodule - Google Patents
The configuration method of mixed type MMC asymmetry Shuangzi module and half-bridge submodule Download PDFInfo
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- CN106953530B CN106953530B CN201710264484.4A CN201710264484A CN106953530B CN 106953530 B CN106953530 B CN 106953530B CN 201710264484 A CN201710264484 A CN 201710264484A CN 106953530 B CN106953530 B CN 106953530B
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- control switching
- submodule
- switching device
- bridge arm
- shuangzi module
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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
- H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
-
- 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
- H02M7/5388—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 asymmetrical configuration of switches
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Rectifiers (AREA)
Abstract
A kind of configuration method of mixed type MMC asymmetry Shuangzi module and half-bridge submodule, the MMC being made of asymmetric Shuangzi module and half-bridge submodule, with the ability for blocking DC side failure, to solve the problems, such as the asymmetric high cost of Shuangzi module and high loss, devise the mixed type MMC structure that asymmetric Shuangzi module and semi-bridge type module combine, propose the concrete configuration method of asymmetric Shuangzi module and semi-bridge type module, and the case where being suitble to asymmetric Shuangzi module configuration whether to retain certain allowance, have to realize from the blocking mixed type MMC asymmetry Shuangzi module of DC side failure and distributing rationally for half-bridge submodule.
Description
Technical field
The present invention relates to power electronics field, especially a kind of mixed type MMC asymmetry Shuangzi module and half-bridge
The configuration method of module.
Background technique
Due to lacking high voltage DC breaker technology, dc-side short-circuit fault is one that flexible high pressure direct current transportation is faced
A major issue seriously affects the development of flexible high pressure HVDC Transmission Technology.Using modularization multi-level converter (modular
Multi-lever converter, MMC) technology flexible high pressure DC transmission system, the dc-side short-circuit fault the case where
Under, the submodule of semi-bridge type MMC has an afterflow ability, and after latch switch pipe, freewheeling diode is AC system to DC Line Fault
Point feed-in fault current provides access, and it is short that three-phase void occurs for AC system side.The method of processing DC side failure has three at present
Kind：(1) connection of exchange side circuit breaker trip fault point and AC system is utilized；(2) failure is cut off using DC side breaker
Route；(3) self-cleaning of DC side failure is realized using inverter self structure.
Although semi-bridge type MMC power device quantity and in terms of have biggish advantage, which does not have
Standby DC Line Fault self-cleaning ability.System dc side occur short trouble in the case where, AC network, freewheeling diode and
Fault point constitutes fault current circuit, and for power grid by empty short, consequence is serious, it is necessary to by exchange side circuit breaker trip AC system and
The connection of fault point.
The flexible high pressure DC transmission engineering currently built up is cut off directly using the method for disconnecting exchange side breaker
Flow side faulty line.Although fault current can be removed by disconnecting exchange side breaker, since exchange side breaker is that machinery is opened
It closes, response speed is slow, so can not accomplish quickly to cut off in this way.In addition during AC circuit breaker disconnects,
Freewheeling diode has been also subjected to huge fault current, it might therefore and damage.
Disconnection dc circuit breaker can quickly remove and isolated fault.The form of high voltage DC breaker also has much at present
Kind, such as conventional mechanical formula, solid state and the mixed type of both.But high voltage DC breaker is expensive at present, skill
Art is also immature.
Therefore, the MMC for having direct-current short circuit failure self-cleaning ability is a kind of new research direction, has DC Line Fault certainly
The asymmetric Shuangzi modular structure of blocking ability is favored with its better economy.The device as used in asymmetric Shuangzi module
How more, higher cost optimizes configuration to asymmetric Shuangzi module and half-bridge submodule, so that mixed type MMC can
DC side failure is blocked, and there can be preferable economy.
Summary of the invention
In view of the above-mentioned problems, the object of the present invention is to provide a kind of mixed type MMC asymmetry Shuangzi module and half-bridge submodules
The configuration method of block devises the mixed type MMC structure that asymmetric Shuangzi module and semi-bridge type module combine, proposes asymmetry
The concrete configuration method of Shuangzi module and semi-bridge type module, and it is suitble to whether asymmetric Shuangzi module configuration retains certain allowance
Situation.
Technical solution of the invention is as follows：
A kind of configuration method of mixed type MMC asymmetry Shuangzi module and half-bridge submodule, the MMC are three-phase knot
Structure, every phase are made of upper and lower bridge arm, and every mutually upper and lower bridge arm respectively concatenates group with n asymmetric Shuangzi module by n symmetrical submodules
At each symmetrical submodule constitutes half-bridge by two full control switching devices and anti-paralleled diode and a DC capacitor, each
Asymmetric Shuangzi module is made of four full control switching devices and anti-paralleled diode with two DC capacitors；Asymmetric Shuangzi mould
The full control switching element T of block1With T2Series connection and formation submodule direct current positive and negative anodes, control switching element T entirely3With T4Series connection, capacitor C1、
C2Series connection, T1、T2、T3、T4Respective anti-paralleled diode, capacitor C1With C2After concatenation and T1With T2Series connection forms asymmetric Shuangzi mould
Block direct current positive and negative anodes are in parallel, capacitor C1、C2Tie point and T3Another tie point be connected, asymmetric Shuangzi module direct current cathode
With T4Another tie point be connected, T1With T2Tie point and T3With T4Port concatenation of the tie point as asymmetric Shuangzi module
In every phase bridge arm circuit；It is characterized in that：A kind of configuration of mixed type MMC the asymmetry Shuangzi module and half-bridge submodule
Method includes the following steps：
1) number of each bridge arm asymmetry Shuangzi module is set as Ni, the number of half-bridge submodule is NH, each bridge arm is total
Submodule number be N, DC bus-bar voltage Vdc, capacitance voltage Uc；The amplitude U of ac phase voltagem；Then guaranteeing faulty circuit
In the case that counter electromotive force is sufficiently large, N is calculatedi, NHMeet following formula respectively：
2) assume that DC voltage grade is identical, when submodule is entirely semi-bridge type structure, the submodule number of every bridge arm
For：N0=Vdc/Uc；Entirely asymmetric Shuangzi module when, submodule number is N0/2；It is asymmetric in mixed type MMC system
Submodule number is set as Ni, semi-bridge type submodule number is set as NH, NiAnd NHDistribution meet formula (1), and 2Ni+NH=N0；
If 3) retain certain allowance to asymmetric Shuangzi module, N can be set as the following formulai, NH：
Wherein：<x>Indicate the smallest positive integral for being greater than parameter x
Compared with prior art, the features of the present invention is as follows：
1. pair DC Line Fault has been carried out from blocking；
2. solving the problems, such as the optimization of mixed type MMC economy；
3. the case where being suitble to asymmetric Shuangzi module configuration whether to retain certain allowance simultaneously.
Detailed description of the invention
Fig. 1 is the topological schematic diagram of mixed type MMC asymmetry Shuangzi module and half-bridge submodule of the present invention.
Fig. 2 is asymmetric Shuangzi module diagram of the invention.
Specific embodiment
Below with reference to embodiment and attached drawing, the invention will be further described, but protection model of the invention should not be limited with this
It encloses.
First referring to Fig. 1, Fig. 1 is a kind of topology of mixed type MMC asymmetry Shuangzi module and half-bridge submodule of the present invention
Schematic diagram, every bridge arm are made of asymmetric Shuangzi module and half-bridge submodule.Fig. 2 is asymmetric Shuangzi module diagram, is opened by 4
Pipe is closed to form with 2 capacitors, more than half-bridge submodule quantity, half-bridge submodule is then made of 2 switching tubes and 1 capacitor, because
This needs the quantity to asymmetric Shuangzi module and half-bridge submodule to optimize and matches to reduce the cost of mixed type MMC
It sets.
The configuration method of mixed type MMC asymmetry Shuangzi module and half-bridge submodule of the present invention, constituting includes three-phase structure
Identical multilevel converter, every phase are all made of upper bridge arm and lower bridge arm, and the upper bridge arm and lower bridge arm are respectively by i half-bridge
Submodule HSM1~HSMi is composed in series with N-i asymmetry Shuangzi module SMi+1~SMN, the 1st son of the upper bridge arm
The anode of the DC bus of the free end and multilevel converter of module HSM1 is connected, the n-th submodule of the lower bridge arm
The cathode of the DC bus of the free end and multilevel converter of SMN is connected, the n-th Shuangzi module SMN of the upper bridge arm
Free end be connected with the free end of the 1st submodule HSM1 of lower bridge arm with AC line；
Each half-bridge submodule HSM is made of two full control switching devices and anti-paralleled diode and a DC capacitor：
Two full control switching device series connection and the direct current positive and negative anodes for forming submodule, two diodes are opened with described two full controls respectively
Device inverse parallel is closed, the DC capacitor is in parallel with described two concatenated full control switching devices, described two full controls
The cathode of the tie point of switching device and the second full control switching device is in the circuit that port is serially connected in every phase bridge arm；
Each asymmetry Shuangzi module SM is constituted：
First diode D1, the second diode D2, third diode D3With the 4th diode D4It is complete with inverse parallel first respectively
Control switching element T1, the second full control switching element T2, third control switching element T entirely3With the 4th full control switching element T4, described
First full control switching element T1With the second full control switching element T2Series connection and the direct current positive and negative anodes for forming asymmetric Shuangzi module, the
One capacitor C1With the second capacitor C2Switching element T is controlled entirely with described concatenated first after series connection1, the second full control switching element T2
Parallel connection, the third control switching element T entirely3With the 4th full control switching element T4Series connection, the third control switching element T entirely3
The other end and first capacitor C1With the second capacitor C2Tie point be connected, the described 4th full control switching element T4The other end
It is connected with the direct current cathode of the asymmetric Shuangzi module, the first full control switching element T1With the second full control switching element T2's
Tie point and third control switching element T entirely3With the 4th full control switching element T4Port of the tie point as asymmetric Shuangzi module
It is serially connected in the circuit of every phase bridge arm；Wherein, N is the integer greater than 2, i<The integer of N；This method comprises the following steps：
1) number of each bridge arm asymmetry Shuangzi module is set as Ni, the number of half-bridge submodule is NH, each bridge arm is total
Submodule number be N, DC bus-bar voltage Vdc, capacitance voltage Uc, ac phase voltage amplitude Um；Then guaranteeing faulty circuit
In the case that counter electromotive force is sufficiently large, N is calculated as follows outi, NH：
2) assume that DC voltage grade is identical, when submodule is entirely semi-bridge type structure, the submodule number of every bridge arm
For：N0=Vdc/Uc；Entirely asymmetric Shuangzi module when, submodule number is N0/2；It is asymmetric in mixed type MMC system
Submodule number is set as Ni, semi-bridge type submodule number is set as NH, NiAnd NHDistribution meet formula (1), and 2Ni+NH=N0；
If 3) retain certain allowance to asymmetric Shuangzi module, N can be set as the following formulai, NH：
Wherein：<x>Indicate the smallest positive integral for being greater than parameter x.
Claims (1)
1. a kind of configuration method of mixed type MMC asymmetry Shuangzi module and half-bridge submodule, constituting includes that three-phase structure is identical
Multilevel converter, every phase is all made of upper bridge arm and lower bridge arm, and the upper bridge arm and lower bridge arm are respectively by i half-bridge submodule
Block (HSM1~HSMi) is composed in series with N-i asymmetric Shuangzi module (SMi+1~SMN), the 1st son of the upper bridge arm
The free end of module (HSM1) is connected with the anode of the DC bus of multilevel converter, the n-th submodule of the lower bridge arm
The free end of block (SMN) is connected with the cathode of the DC bus of multilevel converter, the n-th Shuangzi module of the upper bridge arm
(SMN) free end is connected with the free end of the 1st submodule (HSM1) of lower bridge arm with AC line；
Each half-bridge submodule (HSM) is made of two full control switching devices and anti-paralleled diode and a DC capacitor：Two
A full control switching device series connection and the direct current positive and negative anodes for forming submodule, two diodes are switched with described two full controls respectively
Device inverse parallel, the DC capacitor is in parallel with described two concatenated full control switching devices, and described two full controls are opened
The tie point of device and the direct current cathode of submodule are closed in the circuit that port is serially connected in every phase bridge arm；
Each asymmetry Shuangzi module (SM) is constituted：
First diode (D1), the second diode (D2), third diode (D3) and the 4th diode (D4) respectively with inverse parallel
One full control switching device (T1), the second full control switching device (T2), third control switching device (T entirely3) and the 4th full control switching device
(T4), the described first full control switching device (T1) and the second full control switching device (T2) connect and form asymmetric Shuangzi module
Direct current positive and negative anodes, first capacitor (C1) and the second capacitor (C2) after series connection with the described concatenated first full control switching device
(T1), the second full control switching device (T2) in parallel, the third controls switching device (T entirely3) and the 4th full control switching device (T4)
Series connection, the third control switching device (T entirely3) the other end and first capacitor (C1) and the second capacitor (C2) tie point phase
Even, the described the 4th full control switching device (T4) the other end be connected with the direct current cathode of the asymmetric Shuangzi module,
One full control switching device (T1) and the second full control switching device (T2) tie point and third control switching device (T entirely3) with it is the 4th complete
Control switching device (T4) tie point be serially connected in the circuit of every phase bridge arm as the port of asymmetric Shuangzi module；Wherein, N is
Integer greater than 2, i<The integer of N；It is characterized in that：This method comprises the following steps：
1) number of each bridge arm asymmetry Shuangzi module is set as Ni, the number of half-bridge submodule is NH, the total son of each bridge arm
Number of modules is N, DC bus-bar voltage Vdc, capacitance voltage Uc, ac phase voltage amplitude Um；Then guaranteeing that faulty circuit is anti-electric
In the case that kinetic potential is sufficiently large, N is calculated as follows outi, NH：
2) assume that DC voltage grade is identical, when submodule is entirely semi-bridge type structure, the submodule number of every bridge arm is：N0
=Vdc/Uc；Entirely asymmetric Shuangzi module when, submodule number is N0/2；In mixed type MMC system, asymmetric submodule
Block number is set as Ni, semi-bridge type submodule number is set as NH, NiAnd NHDistribution meet formula (1), and 2Ni+NH=N0；
If 3) retain certain allowance to asymmetric Shuangzi module, N is set as the following formulai, NH：
Wherein：<x>Indicate the smallest positive integral for being greater than parameter x.
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| CN109120174B (en) * | 2018-09-03 | 2020-06-23 | 国网山东省电力公司潍坊供电公司 | Capacitance voltage balancing method based on dual MMC module |
| CN109510495A (en) * | 2018-12-12 | 2019-03-22 | 长沙理工大学 | The mixed type MMC inverter Cost Optimization Approach blocked based on DC Line Fault |
| CN114094867B (en) | 2021-11-24 | 2023-11-17 | 山东大学 | Fractal power converter and construction method thereof |
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| BR102012023337A2 (en) * | 2012-09-17 | 2014-10-29 | Universidade Federal De Santa Catarina | MODULAR MULTILEVEL STATIC CONVERTERS SYSTEM |
| CN103701145B (en) * | 2014-01-02 | 2015-07-08 | 浙江大学 | Mixed MMC-based mixed direct current power transmission system |
| CN204304822U (en) * | 2014-12-31 | 2015-04-29 | 国家电网公司 | A kind of modularization multi-level converter of mixed structure |
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