CN103840478B - A kind of pre-charge method of modular multi-level converter DC transmission system - Google Patents

A kind of pre-charge method of modular multi-level converter DC transmission system Download PDF

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CN103840478B
CN103840478B CN201410067806.2A CN201410067806A CN103840478B CN 103840478 B CN103840478 B CN 103840478B CN 201410067806 A CN201410067806 A CN 201410067806A CN 103840478 B CN103840478 B CN 103840478B
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submodule
brachium pontis
level converter
modular
voltage
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CN103840478A (en
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郭高朋
温家良
吴广禄
杨杰
药韬
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State Grid Corp of China SGCC
Smart Grid Research Institute of SGCC
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State Grid Corp of China SGCC
Smart Grid Research Institute of SGCC
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Abstract

The present invention relates to the charging method in direct current transportation field, be specifically related to a kind of pre-charge method of modular multi-level converter DC transmission system.The method comprises two charging processes of carrying out successively, locking charging process and half locking charging process, the not controlled charging process that wherein locking charging process is mentioned for other documents, half locking charging process is by some submodule bypass, and its trigger impulse distributes and the relevant control of MMC during stable state can carry out simplifying or block some function and obtain by capacitance voltage Balance route.Therefore charging method proposed by the invention is simple, capacitance voltage can be charged to magnitude of voltage during steady operation.

Description

A kind of pre-charge method of modular multi-level converter DC transmission system
Technical field
The present invention relates to the charging method in direct current transportation field, be specifically related to a kind of pre-charge method of modular multi-level converter DC transmission system.
Background technology
DC transmission system is started to the current transformer of research mainly for two level of control, and relate to less to the startup control of the DC transmission system based on MMC, owing to containing a large amount of electric capacity in MMC, therefore, in MMC start-up course, must charge to electric capacity, but be only limitted to utilize DC side or AC to carry out not controlled charging to it to the research of MMC charging process at present, and capacitance voltage when electric capacity can not be charged to steady operation, there is overshoot or distortion in the process ac-side current that causes unblocking.If submodule is charged one by one, submodule electric capacity is charged to voltage during MMC steady operation, but this method is also impracticable, because the driving of IGBT all will get energy from DC capacitor in submodule, just can make the driving live line work of IGBT, therefore, when submodule capacitor voltage is 0, cannot drive IGBT.A method improved first utilizes uncontrollable rectifier to charge to submodule, again each submodule is charged one by one after charging terminates, until the voltage when electric capacity of each submodule is charged to steady operation, but this method needs to write special control program.Because submodule is charged simultaneously, and lossy in each submodule, cause charging terminate after the capacitance voltage difference of each submodule comparatively large, when being unfavorable for unblocking, MMC's is stable.
Summary of the invention
For the deficiencies in the prior art, the object of this invention is to provide a kind of pre-charge method of modular multi-level converter DC transmission system, comprising two charging processes, locking charging process and half locking charging process, the not controlled charging process that wherein locking charging process is mentioned for other documents, half locking charging process is by some submodule bypass, and its trigger impulse distributes and the relevant control of MMC during stable state can carry out simplifying or block some function and obtain by capacitance voltage Balance route.Therefore charging method proposed by the invention is simple, capacitance voltage can be charged to magnitude of voltage during steady operation.
The object of the invention is to adopt following technical proposals to realize:
The invention provides a kind of pre-charge method of modular multi-level converter DC transmission system, described modular multi-level converter at least one, each modular multi-level converter is made up of three-phase, is often made up of two brachium pontis up and down that the structure of connecting is identical; The interchange end of the midpoint connection mode blocking multilevel converter of upper and lower two brachium pontis;
In described upper and lower two brachium pontis, each brachium pontis comprises 1 reactor submodule identical with N number of structure; After the sub module cascade of each brachium pontis, one end is connected with the interchange end of modularization multi-level converter by reactor; After the sub module cascade of each brachium pontis, the other end is connected with submodule one end of the cascade of another two-phase brachium pontis, forms the both positive and negative polarity bus of described modularization multi-level converter DC terminal; Or
In described upper and lower two brachium pontis, each brachium pontis comprises 1 reactor submodule identical with N number of structure; After the sub module cascade of each brachium pontis, one end is connected with the interchange end of modularization multi-level converter; Be connected with the reactor of another two-phase brachium pontis after other end series reactor after the sub module cascade of each brachium pontis, form the both positive and negative polarity bus of described modularization multi-level converter DC terminal;
Its improvements are, the AC of described modular multi-level converter is connected with charging paths; Described pre-charge method comprises the locking charging process and half locking charging process of carrying out successively.
Further, described charging paths comprises the circuit breaker B, by-pass switch-resistor coupled in parallel branch road and the transformer T that connect successively; Described by-pass switch-resistor coupled in parallel branch road comprises by-pass switch P in parallel and current-limiting resistance R;
Described submodule is the submodule of half-bridge structure; Described submodule comprises IGBT series arm in parallel and capacitor C; Described IGBT series arm is made up of the IGBT module of two series connection; One of them IGBT module is made up of IGBT device T1 diode D1 antiparallel with it, and another IGBT module is made up of IGBT device T2 diode D2 antiparallel with it.
Further, described locking charging process comprises the following steps:
Initial condition is: circuit breaker B disconnects, and by-pass switch P disconnects, and the trigger impulse of the IGBT device in modular multi-level converter MMC1 and modular multi-level converter MMC2 is all in blocking;
During startup, the AC of close circuit breaker B, modular multi-level converter MMC1 is charged to the capacitor of each submodule in the capacitor of submodule each in modular multi-level converter MMC1 and MMC2 by current-limiting resistance R;
At the end of locking charging process, the capacitance voltage sum of each brachium pontis of modular multi-level converter MMC1 is charged to modular multi-level converter MMC1 and exchanges side line voltage peak; The capacitance voltage sum of each brachium pontis of modular multi-level converter MMC2 is charged to the half that modular multi-level converter MMC1 exchanges side line voltage peak.
Further, described half locking charging process comprises: in the submodule of half-bridge structure, unblock the trigger impulse of lower pipe IGBT device T2, the trigger impulse of upper pipe IGBT device T1 is still in blocking, by some submodule excision in brachium pontis, continuation is charged by then not cut submodule, until the capacitance voltage sum of submodule not cut in brachium pontis is line voltage peak; The number of the submodule adopting voltage modulated policy control to drop into; Capacitor voltage equalizing control strategy is adopted to maintain the equilibrium of the submodule capacitor voltage in brachium pontis.
Further, described voltage modulated strategy comprises:
In half locking charging process, the modulation ratio of each brachium pontis:
k ≤ 1.732 V m Σ V c - - - ( 1 ) ;
Brachium pontis Neutron module capacitance voltage sum exceedes magnitude of voltage during steady operation, and wherein, during modular multi-level converter steady operation, brachium pontis Neutron module capacitance voltage sum is Σ V c, the voltage peak that modular multi-level converter MMC1 exchanges side line voltage is 1.732V m, each brachium pontis has N number of submodule, order:
m 1=floor(k×N)(2);
Wherein: floor () is for negative infinite to bracket function; When having m in half locking charging process 1individual submodule is put into always, order:
d=k×N-m 1(3);
Then:
m=m 1+D(4);
Wherein: d is duty ratio; D is minimum value is 0, and maximum is the pulse of 1,0.05≤d≤0.95; M, as the input that trigger impulse distributes and capacitor voltage equalizing controls, is the number of the submodule dropped into.
Further, described capacitor voltage equalizing control strategy comprises:
When 1. will drop into a submodule, find out that not drop into voltage in submodule minimum, dropped into;
When 2. will excise a submodule, find out that to drop into voltage in submodule the highest, excised;
3. every 20 milliseconds time detecting once, whether need the submodule number that drops into consistent with the submodule number dropped into, if inconsistent, just the submodule of excision or input difference number, again consistent both making.
Further, after the magnitude of voltage when the capacitance voltage sum of brachium pontis reaches stable operation, lock modules Multilevel Inverters MMC1 and modular multi-level converter MMC2 again, closes bypass switch P, by current-limiting resistance R bypass, charging process terminates, and wait unblocks.
Compared with the prior art, the beneficial effect that the present invention reaches is:
1, by charging method proposed by the invention, the capacitance voltage of MMC can be charged to magnitude of voltage during steady operation, therefore avoid rush of current when unblocking.
2, charging method proposed by the invention, it controls to be simplified by control method during steady operation or block some function and obtain, and need not write separately control program for charging control process, and the method that therefore the present invention proposes is easy to realize.
Accompanying drawing explanation
Fig. 1 is the structure chart of modular multi-level converter MMC provided by the invention;
Fig. 2 is the structure chart of half-bridge submodule provided by the invention;
Fig. 3 is the basic flow sheet of the pre-charge method of DC transmission system provided by the invention;
Fig. 4 is the structure chart of locking charging process provided by the invention;
Fig. 5 is the structure chart of half locking charging process provided by the invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
The invention provides a kind of pre-charge method of DC transmission system of modular multi-level converter, comprising two charging processes, locking charging process and half locking charging process, the not controlled charging process that wherein locking charging process is mentioned for other documents, half locking charging process is by some submodule bypass, and its trigger impulse distributes and the relevant control of MMC during stable state can carry out simplifying or block some function and obtain by capacitance voltage Balance route.Therefore proposed charging method is simple, capacitance voltage can be charged to magnitude of voltage during steady operation.
Wherein said modular multi-level converter at least one, each modular multi-level converter is made up of three-phase, and device structure chart as shown in Figure 1, is often made up of two brachium pontis up and down that the structure of connecting is identical; The interchange end of the midpoint connection mode blocking multilevel converter of upper and lower two brachium pontis;
In described upper and lower two brachium pontis, each brachium pontis comprises 1 reactor submodule identical with N number of structure; After the sub module cascade of each brachium pontis, one end is connected with the interchange end of modularization multi-level converter by reactor; After the sub module cascade of each brachium pontis, the other end is connected with submodule one end of the cascade of another two-phase brachium pontis, forms the both positive and negative polarity bus of described modularization multi-level converter DC terminal; Or
In described upper and lower two brachium pontis, each brachium pontis comprises 1 reactor submodule identical with N number of structure; After the sub module cascade of each brachium pontis, one end is connected with the interchange end of modularization multi-level converter; Be connected with the reactor of another two-phase brachium pontis after other end series reactor after the sub module cascade of each brachium pontis, form the both positive and negative polarity bus of described modularization multi-level converter DC terminal;
The AC of described modular multi-level converter is connected with charging paths; Described pre-charge method comprises the locking charging process and half locking charging process of carrying out successively.
Charging paths comprises the circuit breaker B, by-pass switch-resistor coupled in parallel branch road and the transformer T that connect successively; Described by-pass switch-resistor coupled in parallel branch road comprises by-pass switch P in parallel and current-limiting resistance R; Described submodule is the submodule of half-bridge structure; As shown in Figure 2, described submodule comprises IGBT series arm in parallel and capacitor C to its structure chart; Described IGBT series arm is made up of the IGBT module of two series connection; One of them IGBT module is made up of IGBT device T1 diode D1 antiparallel with it, and another IGBT module is made up of IGBT device T2 diode D2 antiparallel with it.
The basic flow sheet of the pre-charge method of DC transmission system provided by the invention as shown in Figure 3, comprising:
One) locking charging process, its structure chart as shown in Figure 4:
Initial condition is: circuit breaker B disconnects, and by-pass switch P disconnects, and the trigger impulse of the IGBT device in modular multi-level converter MMC1 and modular multi-level converter MMC2 is all in blocking;
During startup, the AC of close circuit breaker B, modular multi-level converter MMC1 is charged to the capacitor of each submodule in the capacitor of submodule each in modular multi-level converter MMC1 and MMC2 by current-limiting resistance R;
At the end of locking charging process, the capacitance voltage sum of each brachium pontis of modular multi-level converter MMC1 is charged to modular multi-level converter MMC1 and exchanges side line voltage peak; The capacitance voltage sum of each brachium pontis of modular multi-level converter MMC2 is charged to the half that modular multi-level converter MMC1 exchanges side line voltage peak.
Two) half locking charging process, its structure chart as shown in Figure 5:
In the submodule of half-bridge structure, unblock the trigger impulse of lower pipe IGBT device T2, the trigger impulse of upper pipe IGBT device T1 is still in blocking, by some submodule excision in brachium pontis, continuation is charged by then not cut submodule, until the capacitance voltage sum of submodule not cut in brachium pontis is line voltage peak; The number of the submodule adopting voltage modulated policy control to drop into; Capacitor voltage equalizing control strategy is adopted to maintain the equilibrium of the submodule capacitor voltage in brachium pontis.
<1> voltage modulated strategy comprises:
In half locking charging process, the modulation ratio of each brachium pontis:
k &le; 1.732 V m &Sigma; V c - - - ( 1 ) ;
Brachium pontis Neutron module capacitance voltage sum exceedes magnitude of voltage during steady operation, and wherein, during modular multi-level converter steady operation, brachium pontis Neutron module capacitance voltage sum is Σ V c, the voltage peak that modular multi-level converter MMC1 exchanges side line voltage is 1.732V m, each brachium pontis has N number of submodule, order:
m 1=floor(k×N)(2);
Wherein: floor () is for negative infinite to bracket function; When having m in half locking charging process 1individual submodule is put into always, order:
d=k×N-m 1(3);
Then:
m=m 1+D(4);
Wherein: d is duty ratio; D is minimum value is 0, and maximum is the pulse of 1,0.05≤d≤0.95; M, as the input that trigger impulse distributes and capacitor voltage equalizing controls, is the number of the submodule dropped into.
<2> capacitor voltage equalizing control strategy comprises:
When 1. will drop into a submodule, find out that not drop into voltage in submodule minimum, dropped into;
When 2. will excise a submodule, find out that to drop into voltage in submodule the highest, excised;
3. every 20 milliseconds time detecting once, whether need the submodule number that drops into consistent with the submodule number dropped into, if inconsistent, just the submodule of excision or input difference number, again consistent both making.
Submodule capacitor voltage equalizing control strategy during half blocking can be simplified by Pressure and Control strategy during stable state or block some function and obtain.
After magnitude of voltage when the capacitance voltage sum of brachium pontis reaches stable operation, locking MMC1 and MMC2, closes bypass switch P again, by current-limiting resistance R bypass, charging process terminates, and wait unblocks.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or equivalent replacement, and not departing from any amendment of spirit and scope of the invention or equivalent replacement, it all should be encompassed in the middle of right of the present invention.

Claims (4)

1. a pre-charge method for modular multi-level converter DC transmission system, described modular multi-level converter at least one, each modular multi-level converter is made up of three-phase, is often made up of two brachium pontis up and down that the structure of connecting is identical; The interchange end of the midpoint connection mode blocking multilevel converter of upper and lower two brachium pontis;
In described upper and lower two brachium pontis, each brachium pontis comprises 1 reactor submodule identical with N number of structure; After the sub module cascade of each brachium pontis, one end is connected with the interchange end of modularization multi-level converter by reactor; After the sub module cascade of each brachium pontis, the other end is connected with submodule one end of the cascade of another two-phase brachium pontis, forms the both positive and negative polarity bus of described modularization multi-level converter DC terminal; Or
In described upper and lower two brachium pontis, each brachium pontis comprises 1 reactor submodule identical with N number of structure; After the sub module cascade of each brachium pontis, one end is connected with the interchange end of modularization multi-level converter; Be connected with the reactor of another two-phase brachium pontis after other end series reactor after the sub module cascade of each brachium pontis, form the both positive and negative polarity bus of described modularization multi-level converter DC terminal;
It is characterized in that, the AC of described modular multi-level converter is connected with charging paths; Described pre-charge method comprises the locking charging process and half locking charging process of carrying out successively;
Described half locking charging process comprises: in the submodule of half-bridge structure, unblock the trigger impulse of lower pipe IGBT device T2, the trigger impulse of upper pipe IGBT device T1 is still in blocking, by some submodule excision in brachium pontis, continuation is charged by then not cut submodule, until the capacitance voltage sum of submodule not cut in brachium pontis is line voltage peak; The number of the submodule adopting voltage modulated policy control to drop into; Capacitor voltage equalizing control strategy is adopted to maintain the equilibrium of the submodule capacitor voltage in brachium pontis;
Described voltage modulated strategy comprises:
In half locking charging process, the modulation ratio of each brachium pontis:
k &le; 1.732 V m &Sigma;V c - - - ( 1 ) ;
Brachium pontis Neutron module capacitance voltage sum exceedes magnitude of voltage during steady operation, and wherein, during modular multi-level converter steady operation, brachium pontis Neutron module capacitance voltage sum is Σ V c, the voltage peak that modular multi-level converter MMC1 exchanges side line voltage is 1.732V m, each brachium pontis has N number of submodule, order:
m 1=floor(k×N)(2);
Wherein: floor () is for negative infinite to bracket function; When having m in half locking charging process 1individual submodule is put into always, order:
d=k×N-m 1(3);
Then:
m=m 1+D(4);
Wherein: d is duty ratio; D is minimum value is 0, and maximum is the pulse of 1,0.05≤d≤0.95; M, as the input that trigger impulse distributes and capacitor voltage equalizing controls, is the number of the submodule dropped into;
Described capacitor voltage equalizing control strategy comprises:
When 1. will drop into a submodule, find out that not drop into voltage in submodule minimum, dropped into;
When 2. will excise a submodule, find out that to drop into voltage in submodule the highest, excised;
3. every 20 milliseconds time detecting once, whether need the submodule number that drops into consistent with the submodule number dropped into, if inconsistent, just the submodule of excision or input difference number, again consistent both making.
2. pre-charge method as claimed in claim 1, it is characterized in that, described charging paths comprises the circuit breaker B, by-pass switch-resistor coupled in parallel branch road and the transformer T that connect successively; Described by-pass switch-resistor coupled in parallel branch road comprises by-pass switch P in parallel and current-limiting resistance R;
Described submodule is the submodule of half-bridge structure; Described submodule comprises IGBT series arm in parallel and capacitor C; Described IGBT series arm is made up of the IGBT module of two series connection; One of them IGBT module is made up of IGBT device T1 diode D1 antiparallel with it, and another IGBT module is made up of IGBT device T2 diode D2 antiparallel with it.
3. pre-charge method as claimed in claim 1, it is characterized in that, described locking charging process comprises the following steps:
Initial condition is: circuit breaker B disconnects, and by-pass switch P disconnects, and the trigger impulse of the IGBT device in modular multi-level converter MMC1 and modular multi-level converter MMC2 is all in blocking;
During startup, the AC of close circuit breaker B, modular multi-level converter MMC1 is charged to the capacitor of each submodule in the capacitor of submodule each in modular multi-level converter MMC1 and MMC2 by current-limiting resistance R;
At the end of locking charging process, the capacitance voltage sum of each brachium pontis of modular multi-level converter MMC1 is charged to modular multi-level converter MMC1 and exchanges side line voltage peak; The capacitance voltage sum of each brachium pontis of modular multi-level converter MMC2 is charged to the half that modular multi-level converter MMC1 exchanges side line voltage peak.
4. pre-charge method as claimed in claim 1, it is characterized in that, after magnitude of voltage when the capacitance voltage sum of brachium pontis reaches stable operation, again lock modules Multilevel Inverters MMC1 and modular multi-level converter MMC2, closes bypass switch P, by current-limiting resistance R bypass, charging process terminates, and wait unblocks.
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