CN104734484B - The simple start method of clamper Shuangzi module multilevel converter - Google Patents
The simple start method of clamper Shuangzi module multilevel converter Download PDFInfo
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- CN104734484B CN104734484B CN201410683047.2A CN201410683047A CN104734484B CN 104734484 B CN104734484 B CN 104734484B CN 201410683047 A CN201410683047 A CN 201410683047A CN 104734484 B CN104734484 B CN 104734484B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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Abstract
The present invention relates to a kind of simple start method of clamper Shuangzi module multilevel converter, 3 stages of start-up course of the present invention point, first stage charges for uncontrollable rectifier, second stage continues to charge for conducting guiding IGBT, and the phase III completes charging for unblock using DC voltage closed loop controller.This method, more suitable for engineer applied, is not required to for a long time using the soft danger opened resistance, and eliminate module capacitance voltage overcharge relative to existing method.
Description
Technical field
The present invention relates to a kind of simple start method of clamper Shuangzi module multilevel converter.
Background technology
With application of the development and Power Electronic Technique of all-controlling power electronics device in power system, based on voltage
The Technology of HVDC based Voltage Source Converter of source transverter is increasingly subject to pay attention to.Modularization multi-level converter (Modular multilevel
Converter, MMC) be flexible direct current power transmission system application in voltage source converter one kind, it is by multiple submodule according to one
Fixed mode is formed by connecting, and makes what transverter exported by the input and excision state that control each submodule IGBT components respectively
Alternating voltage approaches sine wave, realizes the high efficiency of transmission of energy.
Modularization multi-level converter (the C- being made up of clamper Shuangzi module (Clamp Double Sub-Module)
MMC) it is suggested, as shown in figure 1, it can be complete rapidly using the reverse blocking capability of diode by all IGBT devices of locking
Into latching process, DC Line Fault self-cleaning can be achieved without AC circuit breaker action.And relative to being likewise supplied with DC Line Fault
The full-bridge submodule MMC of self-cleaning ability, C-MMC use less power device, reduce running wastage, have higher warp
Ji benefit.
Zhejiang University《Flexible direct current power transmission system》It is proposed that C-MMC startup strategy, fills in uncontrollable rectifier in one book
After electricity to stabilization, combine modulation balance policy using DC voltage controller and continue to charge.Controller uses two close cycles vector solution
Coupling control structure, choose reasonable amplitude limit link；Voltage control uses slop control mode；Submodule is in capacitance voltage balance policy
In the presence of, periodic variation switching state carries out discharge and recharge, all submodules is charged to setting value.This method needs to grow
Time input is soft to open resistance, increases engineering cost.
The another program proposed in the book, according to bridge arm current polarity, the method to be charged using bridge arm as unit.Work as bridge
Arm electric current is just, then to bypass all submodules in the bridge arm；When bridge arm current is negative, then all submodules in the locking bridge arm,
It is charged.Repeat the step to all submodules and be charged to setting value.Module capacitance voltage overcharge be present in this method
Danger.
The content of the invention
, should it is an object of the invention to provide a kind of simple start method of clamper Shuangzi module multilevel converter
Method, more suitable for engineer applied, is not required to open resistance using soft for a long time, and eliminate module capacitance electricity relative to existing method
Press through the danger of charging.
To achieve the above object, the solution of the present invention includes：
A kind of simple start method of clamper Shuangzi module multilevel converter, step are as follows：First stage：It is right
Transverter carries out uncontrollable rectifier charging, until each Shuangzi module has controllability；Second stage：Conducting guiding IGBT, charging are steady
Determine state subgroup module voltage and charge to setting times rated voltage；Phase III：Unblock operation, utilizes DC voltage closed loop controller
Complete charging.
The charging steady state submodule voltage charges to 0.7 times of rated voltage.
H-MMC method for generally starting charges to stabilization (about 0.75pu) first to carry out uncontrollable rectifier, and directly unblock utilizes afterwards
DC voltage closed loop controller continues to charge, and enters normal operation after charging complete.
The present invention copies H-MMC to start method to complete C-MMC startup, is easy to H-MMC engineering experience being transplanted to
On C-MMC.
Start-up course is divided into three phases, and the first stage is uncontrollable rectifier charging, second stage for conducting guiding IGBT after
Continuous charging, phase III are to complete charging using DC voltage closed loop controller after unlocking.
First stage carries out uncontrollable rectifier and charges to stabilization.Because the latch-up characteristic of clamper Shuangzi module is different from half-bridge
Module, cause that its uncontrollable rectifier charge rate is relatively low, it is necessary to which auxiliary charging strategy continues to charge.Hereafter to two seed modules
The charge rate of uncontrollable rectifier charging is analyzed.
Define from DC side anode to positive DC side end as the positive direction (i.e. submodule electric current positive direction) of bridge arm current.Place
In submodule equivalent circuit and the charging current directional correlation of blocking, as shown in Figure 3.
Clamper Shuangzi module is externally equivalent to electric capacity Csm and Diode series form, diode direction and current flowing side
To identical.When bridge arm current is timing, the port voltage of clamper Shuangzi module for two capacitance voltages and；When bridge arm current is negative
When, the port voltage of clamper Shuangzi module is negative single capacitance voltage.
From the foregoing, it will be observed that when bridge arm current is timing, bridge arm voltage is 2N times of capacitance voltage (i.e. capacitance voltage summation)；Work as bridge
When arm electric current is bears, bridge arm voltage is-N times of capacitance voltages.Wherein N is the number per bridge arm clamper Shuangzi module.
Corresponding half-bridge submodule is timing when bridge arm current, and bridge arm voltage is that (i.e. capacitance voltage is total for 2N times of capacitance voltage
With)；When bridge arm current is bears, bridge arm voltage zero.(for contrast, 2N half-bridge submodule is taken per bridge arm).
It can thus be appreciated that in C-MMC topologys, AB voltages between phases are 3N sub- module capacitance chargings.The charging of whole A, B two-phase
Loop and its simplified charge circuit are as shown in Figure 4.And in half-bridge submodule MMC (H-MMC) topologys, AB voltages between phases are only 2N
Submodule electric capacity charges.Therefore the charge rate of C-MMC topologys is low compared with H-MMC topologys.
C-MMC topologys uncontrollable rectifier charging module steady state voltage beCorresponding H-MMC topologys
It is worth and isWherein UmValve side line voltage peak.Submodule capacitor voltage rated value is Uc(rat)=
Udc/2N.By η=Uc(max)/Uc(rat), it is about 0.49, H-MMC that can calculate C-MMC topology charge rates by system modulation degree 0.85
Topological charge rate is about 0.74.
Module capacitance is charged by diode uncontrollable rectifier loop merely, the half of rated voltage can be charged to.The electricity
Pressure can provide stable power supply for the control unit of automatic electricity getting, be easy to use assistant starting control strategy to continue to charge.
Second stage continues to charge for conducting guiding IGBT, cut off when basicly stable it is soft open resistance, continue to charge to steady
State.
As shown in figure 5, guiding IGBT is turned on, after two half-bridge module units are in blocking, work as bridge arm current
For just, then bridge arm voltage is 2N times of capacitance voltage, when bridge arm current is bears, bridge arm voltage zero.
Stabilization is charged to after conducting guiding IGBT, submodule capacitor voltage can be charged to 0.74pu.With H-MMC topologys
Uncontrollable rectifier charging charge rate is identical.
Phase III is to complete charging using DC voltage closed loop controller after unlocking.
Brief description of the drawings
Fig. 1 is clamper Shuangzi module multilevel converter structure chart；
Fig. 2 is clamper Shuangzi module topology；
Fig. 3 a), b) be respectively it is fully closed lock the asynchronous submodule equivalent circuit in charging current direction；
Fig. 4 is the alternate equivalent charge circuit of A, B；
Fig. 5 a), b) be respectively only conducting guiding IGBT, the asynchronous submodule equivalent circuit in charging current direction；
Fig. 6 opens course direct field, alternating-current field simulation waveform to be soft；
Fig. 7 opens process valve in-field simulation waveform to be soft.
Embodiment
The present invention will be further described in detail below in conjunction with the accompanying drawings.
Clamper Shuangzi module topology by two half-bridge submodule units as shown in Fig. 2 pass through two clamp diodes and one
Individual guiding IGBT (To) connects and composes.
Each half-bridge submodule unit has 3 kinds of on off states, and (T11 leads to input state, and T12 breaks；T21 leads to, and T22 breaks), cut
Doing well, (T11's * breaks, and T12 leads to；T21 breaks, and T22 leads to), blocking (two pipe disconnected)；It is break-make two states to guide IGBT points.
" cut off " and refer to above, the output voltage control by submodule or half-bridge submodule unit is zero, that is, reaches module capacitance and be not involved in
The effect of charging；Because when guiding IGBT shut-offs, when bridge arm current is bears, half-bridge submodule unit is in and cuts out state not
Excision effect can be produced, therefore T11 is broken, state logical T12 is defined as " cutting out state ", to distinguish.
The essence for improving charge rate is to increase the equivalent capacitance value in alternate loop, that is, reduces the electric capacity of synchronization charging
Number.What therefore the present invention was concerned only with half-bridge submodule unit cuts out state and blocking, and guiding IGBT on off operating mode.
Following analysis of the present invention does not include the input state of half-bridge submodule unit, and other corresponding mode of operations are summarized in table 1.
The mode of operation of the clamper Shuangzi module of table 1 collects
* mode of operation annotates：
Mode of operation 1 is that two half-bridge submodule units are to cut out state, and guides IGBT conductings；
Mode of operation 2 is that two half-bridge submodule units are blocking, and guides IGBT conductings；
Mode of operation 3 is one for two half-bridge submodule units and cuts out a blocking, and guides IGBT conductings；
Mode of operation 4 is that two half-bridge submodule units are to cut out state, and guides IGBT shut-offs；
Mode of operation 5 is that two half-bridge submodule units are blocking, and guides IGBT shut-offs；
Mode of operation 6 is one for two half-bridge submodule units and cuts out a blocking, and guides IGBT shut-offs.
As shown in figure 5, guiding IGBT ought be turned on only, during 2 half-bridge module units of locking, when bridge arm current be timing, clamp
The port voltage of position Shuangzi module for two capacitance voltages and；When bridge arm current is bears, the port voltage of clamper Shuangzi module
It is zero.
When bridge arm current is timing, bridge arm voltage is 2N times of capacitance voltage (i.e. capacitance voltage summation)；When bridge arm current is
When negative, bridge arm voltage zero.The characteristic is identical with the uncontrollable rectifier charging effect of H-MMC topologys, therefore H-MMC can be copied to open up
The Starting mode flutterred complete C-MMC topology startup.
Start-up course is divided into three phases, and the first stage is uncontrollable rectifier charging, second stage for conducting guiding IGBT after
Continuous charging, phase III are to complete charging using DC voltage closed loop controller after unlocking.
First stage carries out uncontrollable rectifier and charges to stabilization.Because clamper Shuangzi module uncontrollable rectifier charge rate is relatively low, need
Auxiliary charging strategy is wanted to continue to charge.
Second stage will guide IGBT conductings, and the electric capacity number that is electrically charged of alternate charge circuit is reduced to 2N by 3N, made
Submodule electric capacity can continue to charge.After basicly stable, cutting off the soft resistance that opens makes charge rate reach consistent with half-bridge topology
0.75pu。
Phase III completes charging for unblock and using DC voltage closed loop controller.
For the feasibility of method of proof, simulating, verifying has been carried out to the startup method of clamper Shuangzi modular system.
Analogue system is to use rated direct voltage as 400kV, and specified active transimission power is 100MW 21 level moulds
Type.Wherein, specified exchange voltage on valve side is 208.2kV, emulation cycle 12.5us, controlling cycle 50us.Each bridge arm by
10 clamper Shuangzi module compositions, the capacitance voltage of each submodule is 20000V.The soft resistance that opens is defined as 2600ohm.
As knowable to Fig. 6 and Fig. 7, in the 0-0.3s periods, C-MMC models progress nature is soft to open charging, submodule electric capacity electricity
Pressure is charged to about 8000V or so (0.4pu), and the magnitude of voltage has had been provided with the power demands of submodule block control unit automatic electricity getting.
At the 0.3s moment, C-MMC models turn on the guiding IGBT of whole modules.At the 1.2s moment, excision is soft to open resistance, son
Module continues to charge to 15000V (0.75pu), possesses the condition of unblock operation.
At the 1.5s moment, unlock and complete charging using DC voltage closed loop controller.And carry out slope in the 2s moment and carry
Reactive power is risen to -20MVar.
In simulation waveform, whole charging process starts normal, the generation of no over-voltage and over-current failure.Thus this method is demonstrated
Realizability.Compared with conventional method, it is 2 significant differences that the present invention is following：Difference 1：General startup method needs to carry out
Submodule is cut off, and simple start method need not.Difference 2：Submodule can be charged to volume by general startup method before unblock
Determine voltage, submodule is only charged to 0.7 times of rated voltage by simple start method before unblock, and submodule is completed using closed-loop control
Block charges.
Specific embodiment is presented above, but the present invention is not limited to described embodiment.The base of the present invention
This thinking is above-mentioned basic scheme, for those of ordinary skill in the art, according to the teachings of the present invention, designs various changes
The model of shape, formula, parameter simultaneously need not spend creative work.It is right without departing from the principles and spirit of the present invention
The change, modification, replacement and modification that embodiment is carried out are still fallen within protection scope of the present invention.
Claims (2)
- A kind of 1. simple start method of clamper Shuangzi module multilevel converter, it is characterised in that step is as follows：1) first stage：Uncontrollable rectifier charging is carried out to transverter, until each Shuangzi module has controllability；2) second stage：Conducting guiding IGBT, charging steady state submodule voltage charge to setting times rated voltage；3) phase III：Unblock operation, complete to charge using DC voltage closed loop controller.
- 2. the simple start method of clamper Shuangzi module multilevel converter according to claim 1, its feature It is, the charging steady state submodule voltage charges to 0.7 times of rated voltage.
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Families Citing this family (9)
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| CN105939101A (en) * | 2016-03-11 | 2016-09-14 | 广东明阳龙源电力电子有限公司 | MMC system soft-start grid-connected method for flexible direct-current transmission |
| CN105762036B (en) * | 2016-03-29 | 2017-10-20 | 东南大学 | One kind is based on the self-triggering modularization multi-level converter DC side breaker of vortex |
| CN105914719A (en) * | 2016-05-18 | 2016-08-31 | 天津大学 | Fault reclosing method of embedded double-submodule type MMC direct current power transmission system |
| CN107070192B (en) * | 2017-03-30 | 2019-08-06 | 许继电气股份有限公司 | Flexible HVDC transmission system based on combination inverter is coordinated to press starting method |
| CN106981980A (en) * | 2017-04-14 | 2017-07-25 | 许继集团有限公司 | A kind of full-bridge MMC starts control method and system |
| CN107658863B (en) * | 2017-10-09 | 2024-03-08 | 珠海格力电器股份有限公司 | Circuit for inhibiting impact of direct-current capacitive load switching on direct-current micro-grid |
| CN107966623B (en) * | 2017-10-25 | 2022-05-31 | 全球能源互联网研究院 | Testing method, device and system of modular multilevel converter |
| CN109861512A (en) * | 2019-03-08 | 2019-06-07 | 西安交通大学 | A kind of clamper Shuangzi module with DC Line Fault self-cleaning ability |
| CN111371302B (en) * | 2020-03-11 | 2021-09-07 | 合肥科威尔电源***股份有限公司 | Multi-stage soft charging control method and system for multi-level direct current solid-state transformer |
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| CN102170140B (en) * | 2011-04-21 | 2014-04-23 | 中国电力科学研究院 | Method for starting flexible high-voltage direct-current (HVDC) system of modularized multi-level converter |
| CN102739030A (en) * | 2012-07-04 | 2012-10-17 | 浙江省电力试验研究院技术服务中心 | Starting method of full-bridge type MMC-HVDC (modular multilevel converter-high voltage direct current) |
| CN102832801B (en) * | 2012-09-19 | 2015-07-08 | 山东大学 | System and method for grouping and pre-charging modular multilevel converter capacitor |
| CN103280961B (en) * | 2013-04-26 | 2015-10-21 | 华北电力大学（保定） | A kind of UPQC method for starting-controlling based on MMC |
| CN103311944B (en) * | 2013-05-16 | 2016-04-20 | 国家电网公司 | A kind of THE UPFC and starting method thereof adopting modular construction |
| CN104092366B (en) * | 2014-06-26 | 2017-01-04 | 许继电气股份有限公司 | A kind of CMMC starts control method |
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