CN102299506A - Protection system and method thereof for modular multi-level converter - Google Patents
Protection system and method thereof for modular multi-level converter Download PDFInfo
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- CN102299506A CN102299506A CN201110243651XA CN201110243651A CN102299506A CN 102299506 A CN102299506 A CN 102299506A CN 201110243651X A CN201110243651X A CN 201110243651XA CN 201110243651 A CN201110243651 A CN 201110243651A CN 102299506 A CN102299506 A CN 102299506A
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Abstract
The invention relates to a protection system and a method thereof for a modular multi-level converter. The converter comprises three phases and six bridge arms, wherein each bridge arm comprises a reactor and a submodule. According to the invention, an optical current transformer is arranged between connection of the reactors and the power grid; it is determined whether there is an over-current phenomenon by monitoring; if there is an over-current phenomenon, it is also determined whether temporary global interlocking or permanent global interlocking should be carried out. When there is an over-current fault at the one bridge arm, temporary global interlocking protection of the bridge arm is realized within 1.5 ms, so that damage that is caused by the over-current fault can be rapidly avoided by the submodule of the bridge arm. Besides, according to the invention, after 10ms when there is over-current temporary interlocking at the bridge arm, further protective motions of tripping and off-the-line operations of the system are completed, thereby protecting modular multi-level reliability and security in a flexible direct current power transmission system.
Description
Technical field:
The present invention relates to the power electronics direct current transportation field of electric power system, be specifically related to a kind of protection system and guard method thereof of modularization multi-level converter.
Background technology:
Flexible DC power transmission is to adopt a kind of new power transmission mode of direct current as intermediary, adopt modularization multi-level converter and advanced modulation technique to carry out direct current transportation, be that the useful of AC network replenished, can be when realizing that electric power is carried, improve the conveying capacity and the stability of existing AC transmission system, existing AC transmission system is used more effectively.
Modularization multi-level converter is composed in series by a plurality of submodules, and its submodule is made of by-pass switch, thyristor, IGBT, diode and electric capacity.Because each is the change of current brachium pontis of the submodule formation of core with IGBT in the flexible DC power transmission system, fault current desire degree is little, and the over-current protection malfunction that need avoid causing under the complex working condition in system's running is done.
Converter valve fault current desire degree is bigger in the conventional DC transmission system; the required reaction time of control protection system requires not strict; except that the overcurrent protection of bottom thyristor device level; finish system's overcurrent protection task and focus mostly on the upper strata, valve base electronic device does not generally possess brachium pontis current detecting and brachium pontis overcurrent protection function.Because modular multilevel formula flexible DC power transmission system requires high to the real-time of brachium pontis overcurrent protection; therefore in system's control protection equipment, equipment valve base control appliance is finished the demanding overcurrent protection task of real-time to whole overcurrent protection function in control protection equipment lower floor of system by decentralized configuration.Simultaneously, replace the conventional system protected mode with brachium pontis overcurrent protection branch task state.
Summary of the invention:
At the deficiencies in the prior art, the object of the present invention is to provide a kind of protection system and guard method thereof of modularization multi-level converter, realize keeping away fast the damage that over current fault causes.
The protection system of a kind of modularization multi-level converter provided by the invention, described protection system comprise submodule controller, valve base control appliance and the utmost point control system that connects successively; Its improvements are, described protection system is included between reactor in the described converter and the electrical network current transformer is set.
The protection system of first preferred version provided by the invention, its improvements be, described valve base control appliance comprises main valve base control appliance and from the valve base control appliance; Described utmost point control system comprises main pole control system and from utmost point control system;
Described main valve base control appliance and from valve base control appliance, described main pole control system with between utmost point control system, connect by optical fiber; Described main valve base control appliance be connected with described submodule controller respectively from the valve base control appliance;
Described converter comprises 3 phases, 6 brachium pontis, and described brachium pontis comprises the submodule of reactor and series connection; Described reactor and the series connection of described submodule;
The submodule controller of described protection system is connected with the base stage of IGBT in the submodule of described converter.
The protection system of second preferred version provided by the invention, its improvements are that described current transformer comprises current transformer (I, II);
Measure passage and be connected with described 6 brachium pontis respectively for 6 of described current transformer (I, II);
The digital output port of described current transformer (I, II) is connected from the valve base control appliance with described with described main valve base control appliance respectively, and the analog output mouth of described current transformer (I, II) is connected from utmost point control system with described with described main pole control system respectively.
The protection system of the 3rd preferred version provided by the invention, its improvements are that described current transformer is an optical current mutual inductor.
The present invention is based on the guard method of a kind of modularization multi-level converter as claimed in claim 1 that another purpose provides, its improvements are, described guard method comprises that the brachium pontis overcurrent judges and the brachium pontis overcurrent protection; Wherein said overcurrent is meant that the magnitude of current of arbitrary brachium pontis of 6 brachium pontis surpasses the 1.5Pu of rated current amount.
The guard method of first preferred version provided by the invention, its improvements are that described brachium pontis overcurrent judgement comprises the steps:
(1) judging described main valve base control appliance and whether normal from communications status between the valve base control appliance, is then to carry out step (2), otherwise carries out step (3);
(2) described main valve base control appliance and simultaneously described 6 brachium pontis are carried out over-current detection by corresponding optical current mutual inductor I and optical current mutual inductor II from the valve base control appliance, all do not detect over-current phenomenon avoidance when main valve base control appliance with from the valve base control appliance, then main valve base control appliance is a not overcurrent of brachium pontis to brachium pontis overcurrent result of determination;
At least one detects over-current phenomenon avoidance when main valve base control appliance with from the valve base control appliance, and then main valve base control appliance is the brachium pontis overcurrent to brachium pontis overcurrent result of determination, and begins to carry out brachium pontis overcurrent protection action;
(3) described main valve base control appliance carries out over-current detection by current transformer I to described 6 brachium pontis, obtains final brachium pontis overcurrent result of determination.
The guard method of second preferred version provided by the invention, its improvements are that described brachium pontis overcurrent protection comprises the steps:
1. described main valve base control appliance with judge from the valve base control appliance whether normal current transformer (I, II) communicates by letter; 2. the communication 1. of described step just often is weighted on average according to the current value of described step (2), repeats 6 times, obtains the brachium pontis magnitude of current;
3. described main valve base control appliance judges whether the described step brachium pontis magnitude of current 2. belongs to over-current phenomenon avoidance, then carries out temporary transient overall locking processing if belong to over-current phenomenon avoidance, otherwise carries out step 4.;
4. the result of determination that described main valve base control appliance over-current phenomenon avoidance occurs according to described step (2) and described step (3) is carried out described temporary transient overall locking and is handled, and the result of determination that does not occur over-current phenomenon avoidance according to described step (2) and described step (3) is carried out brachium pontis magnitude of current normal process;
5. carry out described temporary transient overall blocking time for continuing 10ms, after carrying out temporary transient overall locking 10ms, main valve base control appliance is to temporary transient overall locking time counting number, and during the overall block signal that does not receive that main pole control system issues, main valve base control appliance is carried out automatic unlocking and is also opened 100ms and countdown; If in the 100ms over-current phenomenon avoidance takes place once more after the release, then main valve base control appliance sends permanent overall block signal, and main valve base control appliance sends emergency tripping operation request to main pole control system; If in the 100ms over-current phenomenon avoidance does not take place after the release, then the system restoration normal condition.
6. 4. described step judges current described state and the described temporary transient overall blocking of countdowning that whether be in normal process the time:
If the state of countdowning finishes, then main pole control system is with the zero clearing of described temporary transient overall locking number of times;
If be not in described temporary transient overall blocking and be not in the described state of countdowning, then directly withdraw from processing;
If be not in the state of countdowning, but be in described temporary transient overall blocking, then enter the judgement whether described temporary transient overall blocking finishes;
The guard method of more preferably scheme provided by the invention, its improvements are that the judgement whether described temporary transient overall blocking finishes comprises:
If described temporary transient overall blocking does not finish directly to withdraw from processing;
If described temporary transient overall blocking finishes and the current overall block signal of not receiving transmission, then carry out release and open the 100ms timing.
The guard method of another preferred version provided by the invention, its improvements are that the IGBT that promptly closes all submodules is handled in described temporary transient overall locking, and the temporary transient overall blocking duration is 10ms.
The guard method of a preferred version more provided by the invention, its improvements are that the described state duration of countdowning is 100ms.
Term among the application " 6 brachium pontis " means 6 brachium pontis.
Compared with the prior art, beneficial effect of the present invention is:
1. this programme has proposed a kind of brachium pontis overcurrent protection implementation in the modular multilevel formula flexible DC power transmission system, and system can realize the temporary latch-up protection of brachium pontis in the 1.5ms after the brachium pontis over current fault takes place.Make the brachium pontis submodule can keep away the damage that causes because of over current fault fast.
2. branch's mode protected mode reduces the influence of possible over-current protection malfunction.
3. system can finish the tripping operation stoppage in transit protection action of further system after the temporary locking 10ms of brachium pontis overcurrent takes place, and has protected the reliability and the fail safe of modular multilevel in the flexible DC power transmission system.
Description of drawings
Fig. 1 is the system construction drawing of the many level of flexible DC power transmission system modular provided by the invention.
Fig. 2 is a brachium pontis current measurement provided by the invention mechanism redundant configuration conceptual scheme.
Fig. 3 is a brachium pontis overcurrent protection flow process provided by the invention.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
Because modular multilevel formula flexible DC power transmission system self-characteristic, under system's generation DC bipolar short-circuit conditions, require brachium pontis at 1.5ms with the interior blocking that enters, otherwise will damage the devices such as IGBT of submodule inside.Deduct the brachium pontis current acquisition and with time of digital coding form transmission be 0.2ms, submodule time of implementation and necessary reliable desire amount time are 0.5ms, controller will be finished sampling filter and make fault verification in 0.8ms, then blocking order is handed down to each submodule on the brachium pontis.For reducing the influence of possible over-current protection malfunction, require system when the brachium pontis over current fault takes place in short-term, by branch's protected mode, protect.After brachium pontis is carried out temporary block action the brachium pontis submodule is protected; after recovering in short-term, can continue system's over current fault the release operation; if over current fault does not recover after locking in short-term yet; then carry out further protection action; permanent locking and system trip and apply for, do not allow to take place in the 100ms twice temporary locking of mistake because of the overcurrent generation simultaneously.Thereby the protection misoperation that causes when avoiding taking place the recoverable over current fault of brachium pontis in short-term.Therefore, require the defencive function Task Distribution of The whole control protection system heterarchical architecture reasonable, the valve base control appliance has high processing capability in real time and finishes each protection action under the brachium pontis overcurrent branch protected mode.
Fig. 1 is the system construction drawing of the many level of flexible DC power transmission system modular.Modular multilevel is made of 3 phases, 6 brachium pontis, and each brachium pontis comprises the reactor of series connection successively and the submodule of at least one.Submodule comprises IGBT and diode antiparallel with it; The base stage of IGBT is connected with submodule controller, valve base control appliance and utmost point control equipment successively.Utmost point control system issues control command and gives the valve base control appliance, by opening with closed of valve base control appliance and submodule controller control IGBT.Wherein, each submodule is controlled by a sub-module controller on the brachium pontis.
The valve base control appliance comprises main valve base control appliance and from the valve base control appliance; Utmost point control equipment comprises main pole control equipment and from utmost point control equipment; Main valve base control appliance and from valve base control appliance, main pole control equipment with between utmost point control equipment, connect by optical fiber.
Based on this, present embodiment is provided with optical current mutual inductor I and II between brachium pontis reactor and electrical network junction.Measure passage and be connected with 6 brachium pontis respectively for 6 of current transformer I; Measure passage and be connected with 6 brachium pontis respectively for 6 of current transformer II;
Fig. 2 is a brachium pontis current measurement mechanism redundant configuration conceptual scheme.The digital output port of optical current mutual inductor I is connected with main valve base control appliance, and the analog output mouth of optical current mutual inductor I is connected with main pole control equipment; The digital output port of optical current mutual inductor II be connected from the valve base control appliance, the analog output mouth of optical current mutual inductor II be connected from utmost point control equipment.
Judgement of brachium pontis overcurrent and brachium pontis overcurrent protection in the guard method of present embodiment are as follows:
Under the two redundant states of brachium pontis optical current mutual inductor and valve base control appliance the valve base control appliance to the brachium pontis overcurrent judge regular as shown in the table.Overcurrent is meant that the magnitude of current of at least one brachium pontis in 6 brachium pontis surpasses the 1.5Pu of rated current amount.
Has real-time optical channel communication interaction between principal and subordinate's valve base control appliance.
Table 1. pair redundant valve base control appliance is to brachium pontis overcurrent decision rule
Be described as follows:
(1) judging described main valve base control appliance and whether normal from communications status between the valve base control appliance, is then to carry out step (2), otherwise carries out step (3);
(2) described main valve base control appliance and simultaneously described 6 brachium pontis are carried out over-current detection by corresponding optical current mutual inductor I and optical current mutual inductor II from the valve base control appliance, all do not detect over-current phenomenon avoidance when main valve base control appliance with from the valve base control appliance, then main valve base control appliance is a not overcurrent of brachium pontis to brachium pontis overcurrent result of determination;
At least one detects over-current phenomenon avoidance when main valve base control appliance with from the valve base control appliance, and then main valve base control appliance is the brachium pontis overcurrent to brachium pontis overcurrent result of determination, and begins to carry out brachium pontis overcurrent protection action;
(3) described main valve base control appliance carries out over-current detection by current transformer I to described 6 brachium pontis, obtains final brachium pontis overcurrent result of determination.
Main valve base control appliance carries out the brachium pontis overcurrent protection according to brachium pontis overcurrent final decision result, as shown in Figure 3, comprises the steps:
1. main valve base control appliance with judge respectively from the valve base control appliance whether optical current mutual inductor I communicates by letter with optical current mutual inductor II normal; Normally then upgrade this road communication failure number of times of brachium pontis electric current real-time measurement values and subtract 1, and carry out step 2), then this road communication failure number of times is added 2 as if undesired;
2. step communication 1. just often is weighted on average according to the current value of step (2), repeats 6 times, obtains the brachium pontis magnitude of current;
3. main valve base control appliance judges whether the described step brachium pontis magnitude of current 2. belongs to over-current phenomenon avoidance, then carries out temporary transient overall locking processing if belong to over-current phenomenon avoidance, otherwise carries out step 4.; The IGBT that promptly closes all submodules is handled in temporary transient overall locking, and its specific practice is the by-pass switch K that closes in the closed submodule.
4. main valve base control appliance carries out described temporary transient overall locking according to the result of the appearance over-current phenomenon avoidance of described step (2) and described step (3) and handles, and carries out brachium pontis magnitude of current normal process according to the result who over-current phenomenon avoidance do not occur of described step (2) and described step (3);
5. carry out described temporary transient overall blocking time for continuing 10ms, after carrying out temporary transient overall locking 10ms, main valve base control appliance is to temporary transient overall locking time counting number, and during the overall block signal that does not receive that main pole control system issues, main valve base control appliance is carried out automatic unlocking and is also opened 100ms and countdown; If in the 100ms over-current phenomenon avoidance takes place once more after the release, then main valve base control appliance sends permanent overall block signal, and main valve base control appliance sends emergency tripping operation request to main pole control system; If in the 100ms over-current phenomenon avoidance does not take place after the release, then the system restoration normal condition.
6. 4. described step judges current described state and the described temporary transient overall blocking of countdowning that whether be in normal process the time:
If the 100ms state of countdowning finishes, then main pole control system is with the zero clearing of described temporary transient overall locking number of times;
If be not in described temporary transient overall blocking and be not in the described state of countdowning, then directly withdraw from processing;
If be not in the state of countdowning, but be in described temporary transient overall blocking, then enter the judgement whether described temporary transient overall blocking finishes.
The judgement whether described temporary transient overall blocking finishes comprises:
If described temporary transient overall blocking does not finish directly to withdraw from processing;
If described temporary transient overall blocking finishes and the current overall block signal of not receiving transmission, then carry out release and open 100ms and countdown.
The optical current mutual inductor I of present embodiment and the model of optical current mutual inductor II are NXCT35.
Should be noted that at last: only illustrate that in conjunction with the foregoing description technical scheme of the present invention is not intended to limit.Those of ordinary skill in the field are to be understood that: those skilled in the art can make amendment or are equal to replacement the specific embodiment of the present invention, but these modifications or change are all among the claim protection range that application is awaited the reply.
Claims (10)
1. the protection system of a modularization multi-level converter, described protection system comprise submodule controller, valve base control appliance and the utmost point control system that connects successively; It is characterized in that described protection system is included between reactor in the described converter and the electrical network current transformer is set.
2. protection system as claimed in claim 1 is characterized in that, described valve base control appliance comprises main valve base control appliance and from the valve base control appliance; Described utmost point control system comprises main pole control system and from utmost point control system;
Described main valve base control appliance and from valve base control appliance, described main pole control system with between utmost point control system, connect by optical fiber; Described main valve base control appliance be connected with described submodule controller respectively from the valve base control appliance;
Described converter comprises 3 phases, 6 brachium pontis, and described brachium pontis comprises the submodule of reactor and series connection; Described reactor and the series connection of described submodule;
The submodule controller of described protection system is connected with the base stage of IGBT in the submodule of described converter.
3. protection system as claimed in claim 1 is characterized in that, described current transformer comprises current transformer (I, II);
Measure passage and be connected with described 6 brachium pontis respectively for 6 of described current transformer (I, II);
The digital output port of described current transformer (I, II) is connected from the valve base control appliance with described with described main valve base control appliance respectively, and the analog output mouth of described current transformer (I, II) is connected from utmost point control system with described with described main pole control system respectively.
4. protection system as claimed in claim 1 is characterized in that, described current transformer is an optical current mutual inductor.
5. the guard method of a modularization multi-level converter as claimed in claim 1 is characterized in that, described guard method comprises judgement of brachium pontis overcurrent and brachium pontis overcurrent protection; Wherein said overcurrent is meant that the magnitude of current of arbitrary brachium pontis of 6 brachium pontis surpasses the 1.5Pu of rated current amount.
6. guard method as claimed in claim 5 is characterized in that, described brachium pontis overcurrent judgement comprises the steps:
(1) judging described main valve base control appliance and whether normal from communications status between the valve base control appliance, is then to carry out step (2), otherwise carries out step (3);
(2) described main valve base control appliance and simultaneously described 6 brachium pontis are carried out over-current detection by corresponding described optical current mutual inductor I and optical current mutual inductor II from the valve base control appliance, all do not detect over-current phenomenon avoidance when main valve base control appliance with from the valve base control appliance, then main valve base control appliance is a not overcurrent of brachium pontis to brachium pontis overcurrent result of determination;
At least one detects over-current phenomenon avoidance when main valve base control appliance with from the valve base control appliance, and then main valve base control appliance is the brachium pontis overcurrent to brachium pontis overcurrent result of determination, and begins to carry out brachium pontis overcurrent protection action;
(3) described main valve base control appliance carries out over-current detection by current transformer I to described 6 brachium pontis, obtains final brachium pontis overcurrent result of determination.
7. guard method as claimed in claim 5 is characterized in that, described brachium pontis overcurrent protection comprises the steps:
1. described main valve base control appliance with judge from the valve base control appliance whether normal current transformer (I, II) communicates by letter; 2. the communication 1. of described step just often is weighted on average according to the current value of described step (2), repeats 6 times, obtains the brachium pontis magnitude of current;
3. described main valve base control appliance judges whether the described step brachium pontis magnitude of current 2. belongs to over-current phenomenon avoidance, then carries out temporary transient overall locking processing if belong to over-current phenomenon avoidance, otherwise carries out step 4.;
4. the result of determination that described main valve base control appliance over-current phenomenon avoidance occurs according to described step (2) and described step (3) is carried out described temporary transient overall locking and is handled, and the result of determination that does not occur over-current phenomenon avoidance according to described step (2) and described step (3) is carried out brachium pontis magnitude of current normal process;
5. carry out described temporary transient overall blocking time for continuing 10ms, after carrying out temporary transient overall locking 10ms, main valve base control appliance is to temporary transient overall locking time counting number, and during the overall block signal that does not receive that main pole control system issues, main valve base control appliance is carried out automatic unlocking and is also opened 100ms and countdown; If in the 100ms over-current phenomenon avoidance takes place once more after the release, then main valve base control appliance sends permanent overall block signal, and main valve base control appliance sends emergency tripping operation request to main pole control system;
6. 4. described step judges current described state and the described temporary transient overall blocking of countdowning that whether be in normal process the time:
If the state of countdowning finishes, then main pole control system is with the zero clearing of described temporary transient overall locking number of times;
If be not in described temporary transient overall blocking and be not in the described state of countdowning, then directly withdraw from processing;
If be not in the state of countdowning, but be in described temporary transient overall blocking, then enter the judgement whether described temporary transient overall blocking finishes;
8. guard method as claimed in claim 7 is characterized in that, the judgement whether described temporary transient overall blocking finishes
Comprise:
If described temporary transient overall blocking does not finish directly to withdraw from processing;
If described temporary transient overall blocking finishes and the current overall block signal of not receiving transmission, then carry out release and open the 100ms timing.
9. guard method as claimed in claim 7 is characterized in that, the IGBT that promptly closes all submodules is handled in described temporary transient overall locking, and the temporary transient overall blocking duration is 10ms.
10. guard method as claimed in claim 7 is characterized in that, the described state duration of countdowning is 100ms.
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