CN103227464A - Submodule redundancy configuration method of flexible direct-current transmission control system - Google Patents
Submodule redundancy configuration method of flexible direct-current transmission control system Download PDFInfo
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- CN103227464A CN103227464A CN2013100952005A CN201310095200A CN103227464A CN 103227464 A CN103227464 A CN 103227464A CN 2013100952005 A CN2013100952005 A CN 2013100952005A CN 201310095200 A CN201310095200 A CN 201310095200A CN 103227464 A CN103227464 A CN 103227464A
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Abstract
The invention discloses a submodule redundancy configuration method of a flexible direct-current transmission control system. In the flexible direct-current transmission control system, multiple pieces of valve-controlled electronic equipment are connected with a bridge arm, and the bridge arm comprises redundant submodules. The submodule redundancy configuration method comprises the following steps: returning the number of submodules at a normal state or a fault state to an upper computer control system through an optical fiber communication protocol by each valve-controlled electronic equipment; computing the number of current redundant submodules of the bridge arm by an upper computer, the computing method is that the total number of the submodules of the bridge arm subtracts the maximum number of submodules of the bridge arm in a normal working period and subtracts the number of submodules at the fault state; proportionally allocating the redundant submodules on the multiple pieces of valve-controlled electronic equipment; and regulating the number of the redundant submodule by periodically regulating the allocation coefficient of each valve-controlled electronic equipment. The submodule redundancy configuration method is applied to allocation of the redundant submodules of the bridge arm of a modularized multi-level flexible direct-current converter valve among the connected multiple valve-controlled electronic equipment, and control over a submodule switching strategy of the system under the condition of considering redundancy allocation.
Description
Technical field
The invention belongs to the flexible transmission field, be specifically related to a kind of submodule redundant configuration method of flexible DC power transmission control system.
Background technology
Flexible DC power transmission adopts voltage source converter, can independent regulation gain merit and idle transmission, the ability to transmit electricity of raising AC system, be easy to constitute the multiterminal DC transmission system, in application such as electricity generation grid-connecting, isolated island urban electricity supply and the AC system of regenerative resource be interconnected, has tangible competitiveness.
When the submodule series system that adopts half-bridge or full-bridge constitutes the converter topology, the converter output voltage is determined by the submodule output level, with the half-bridge is example, according to submodule the opening of pipe, off state up and down, and brachium pontis sense of current, the running status of submodule of drawing is seen Fig. 1, this figure (a), (d) are triggerless pulsed operation state, (b), (e) opens the submodule state of devoting oneself to work for last pipe, (c), (f) open submodule excision operating state for following pipe, arrow is represented the brachium pontis sense of current.The triggering state corresponding relation of the input of submodule/excision state and switching device is: when going up of submodule managed the IGBT1 triggering and conducting, submodule is in the input state, under when managing the IGBT2 triggering and conducting, submodule is in the excision state, it is a kind of state that only can occur in the initial valve charging stage that closed venation dashes, and can not occur when normally moving.
At the normal charged release run duration of valve, the submodule that is in normal condition all is to drop into or the excision state, and output level is shown below;
u
cBe submodule capacitance voltage numerical value.
Actual alternating current-direct current side control output voltage is to be made of a plurality of level steps that are in the submodule of input state, and the switching order of controlling these submodules is sent by valve control electronic equipment.
Along with through-put power and direct voltage increase, single brachium pontis needs the sub-series module number to increase thereupon, in view of separate unit valve control electronic equipment bus disposal ability and dsp board card load limit, need expand to two and above valve control electronic equipment and same brachium pontis is carried out control command issue and the submodule state acquisition.
After each brachium pontis is adopted certain submodule switching algorithm, even this brachium pontis has dropped into the submodule of controlling needed maximum quantity, still there is the parton module to be in the excision state, this part submodule that is in the excision state is exactly a redundant sub, when adopting single valve control electronic equipment, total redundant sub quantity of brachium pontis equals this valve control electronic equipment and sets initial redundancy submodule quantity, when adopting a plurality of valve control electronic equipments to be connected with same brachium pontis, each valve control electronic equipment distributes the submodule of some, and the redundant sub of this brachium pontis also need be distributed according to certain rule between each valve control electronic equipment simultaneously.
In particular cases, submodule is because device failure, storage capacitor damages, when perhaps triggering control fails, when submodule feeds back this malfunction to valve control electronic equipment, carry out bypass by valve control electronic equipment and handle, the submodule of bypass can not be equal to the submodule of excision state, not as redundant sub.
Mostly existing technology is do not considering under the redundant situation (referring to the fourth champion; Tang Guangfu; fourth is bright; the deep pool of he; the topological mechanism and the modulation strategy of novel voltage with multiple levels source converter module; Proceedings of the CSEE; 2009; 29(36): 1-8); the distribution mechanism of perhaps not considering a plurality of valve control electronic equipments after the redundant number change after the submodule fault is (referring to GEMMELL B; DORN J; RETZMANN D; et al.Prospects of multilevel VSC technologies for power transmission; Proceedings of IEEE PES Transmission and Distribution Conference and Exposition; April21-24; 2008; Chicago; USA:1-16), perhaps under the single valve control electronic equipment situation, consider the redundancy setting of submodule; do not relate to redundant sub at the dynamic allocation method of a plurality of valve control electronic equipments (referring to Guan Minyuan; Xu Zheng. modularization multi-level converter submodule fault characteristic and redundancy protecting, Power System and its Automation, 2011; 35(16): 94-98), have much room for improvement.
Summary of the invention
Purpose of the present invention, be to provide a kind of flexible DC power transmission control system submodule redundant configuration method, be used for the distribution of redundant sub between a plurality of valve control electronic equipments that connect of the flexible DC converter valve brachium pontis of modular multilevel, and considering that control system is to the Switching Strategy of submodule under the redundant situation of distributing.
In order to reach above-mentioned purpose, solution of the present invention is:
A kind of flexible DC power transmission control system submodule redundant configuration method, in the described flexible DC power transmission control system, many deck valves control electronic equipment is connected with same brachium pontis, brachium pontis comprises redundant sub, and the content of described method is: each valve control electronic equipment returns to the submodule quantity that upper computer control system is in normal condition or malfunction by the optical-fibre communications agreement; Calculate the current redundant sub quantity of brachium pontis by host computer, Calculation Method is: maximal submodule quantity-fault submodule quantity that brachium pontis submodule sum-this brachium pontis normal work period drops into; On many deck valves control electronic equipment, pro rata distribute redundant sub then; Adjusting the redundant sub number is to be undertaken by the distribution coefficient of periodically adjusting every deck valve control electronic equipment.
Above-mentioned adjustment cycle is the integral multiple in the dsp operation cycle of valve control electronic equipment.
When valve control electronic equipment is m(m 〉=2) during platform, set redundant number allocation proportion coefficient k
j(j=1,2 ..., m), coefficient satisfies relation: ∑ k
j=1,0≤k
j≤ 1, j=1 wherein, 2 ..., m, each valve control electronic equipment obtains redundant sub quantity n separately according to redundant number allocation proportion coefficient
Rj: n
Rj=n
r* k
j, wherein, n
rBe the current redundant sub quantity of brachium pontis.
After valve charging release operation, redundant number allocation proportion coefficient k
jAdjustment calculating is to calculate according to the degree of the capacitance voltage offrating of current each submodule and in conjunction with the brachium pontis sense of current; The method of adjusting is the degree function according to offrating, and according to specifying step-length to adjust this coefficient, the restriction principle of adjustment is: redundant number becomes 0, and the total redundant number of perhaps single brachium pontis stops to adjust.
Before the charging, the maximal submodule quantity of duration of work input is to require to estimate according to the converter output level to obtain, the normal condition of returning according to each valve control electronic equipment or the submodule quantity of malfunction again, statistics obtains the submodule of brachium pontis fault, obtains the current redundant sub quantity of brachium pontis n thus
r
It is as follows to set a valve control electronic equipment initial redundancy counting method:
A kind of method is an equalitarian distribution method, and promptly regardless of every deck valve control electronic equipment connexon module number, the original allocation coefficient is 1/m; Another method is to distribute according to every deck valve control electronic equipment connexon module number ratio.
If appearring in run duration, brachium pontis submodule fault cause this brachium pontis redundant sub quantity to reduce, when perhaps the maximal submodule quantity of this brachium pontis normal work period input changes, current redundant number will change, and adjust the back again according to redundant number allocation proportion coefficient k by host computer
jEvery deck valve control electronic equipment is distributed respectively.
This brachium pontis normal work period, when every deck valve control electronic equipment transmitting order to lower levels drops into the submodule number, must be under the situation that keeps redundant number, the submodule of choosing corresponding number in remaining nonredundancy submodule is used for the work input, and method is the upper limit that remaining nonredundancy submodule number is dropped into the order of submodule quantity as this valve control electronic equipment.
After adopting such scheme, the method of adjusting redundant number is to be undertaken by the distribution coefficient of periodically adjusting every deck valve control electronic equipment, after distributing in this manner, surpass predefined redundant number even can guarantee the submodule fault that connects at some valve control electronic equipments, also can be under distribution measure of the present invention, guarantee certain redundant quantity, six brachium pontis of three-phase all can adopt identical redundant distribution mechanism and Switching Strategy; On the other hand, distributing the benefit of redundant sub according to above method at each valve control electronic equipment is equivalence to reduce or to increase on average discharging and recharging the time of connexon module, help the balance of the submodule capacitance voltage of whole brachium pontis, and then help the stable of output dc voltage and alternating voltage.
Description of drawings
Three kinds of running status schematic diagrames of submodule under different brachium pontis senses of current when Fig. 1 is submodule employing half-bridge series system formation converter topology;
Wherein, (a) the expression sense of current is clockwise blocking figure, (b) the expression sense of current is clockwise input state diagram, (c) the expression sense of current is clockwise excision state diagram, (d) the expression sense of current is counterclockwise blocking figure, (e) the expression sense of current is counterclockwise input state diagram, and (f) the expression sense of current is counterclockwise excision state diagram;
Fig. 2 is a plurality of valve control electronic equipments and valve brachium pontis connected mode.
Embodiment
Below with reference to drawings and the specific embodiments, technical scheme of the present invention is elaborated.
(a), (d) they are triggerless pulse submodule operating state among Fig. 1, (b), (e) open the submodule state of devoting oneself to work for last pipe, and (c), (f) open submodule excision operating state for pipe down.The brachium pontis redundant sub is operated in Fig. 1 (c), (f) state exactly.Host computer be connected with each valve control electronic equipment optical-fibre communications see shown in Figure 2, each valve control electronic equipment directly is connected with host computer, do not have principal and subordinate's branch, the status is identical, all receives from host computer and distributes redundant sub number and input/excision submodule quantity order.Host computer goes out brachium pontis residue redundant sub according to the good submodule quantity statistics of each valve control electronic equipment feedback simultaneously, then according to redundant number allocation proportion coefficient k
jDistribute to each valve control electronic equipment.
Before the charge operation, by converter output dc voltage rating number u
d, submodule capacitance voltage rating number u
CrDetermine the submodule maximum quantity n that single brachium pontis may drop into
Tm:
General brachium pontis is equipped with redundant number and decides according to certain redundant configuration coefficient gamma, requires general γ=15%-30% according to valve body construction investment economy and safe operation, the submodule sum of an actual brachium pontis:
n
s=n
tm(1+γ)
Brachium pontis initial redundancy submodule quantity is calculated as follows: n
Tm* γ.
The redundant allocation proportion coefficient of supposing valve control electronic equipment is: k
1, k
2, k
3..., k
m, and satisfy 0≤k
m≤ 1, k
1+ k
2+ k
3+ ... + k
m=1, and the current redundant sub quantity of brachium pontis is n
r, the redundant number that obtains each valve control electronic equipment distribution is: n
Rj=n
r* k
j, j=1,2 ..., m, wherein m is a valve control number of electronic devices.
Setting redundant sub quantity before the valve charging is n
Rj=n
Tm* γ.Redundant allocation proportion coefficient can take following two kinds of methods to carry out: a kind of method is an equalitarian distribution method, and promptly regardless of every deck valve control electronic equipment connexon module number, the original allocation coefficient is 1/m; Another method is to distribute according to every deck valve control electronic equipment connexon module number size, repeats no more.
Behind the valve charge operation, after receiving the submodule quantity that each valve control electronic equipment returns, calculate the submodule of maximum quantity of the required input of current this brachium pontis according to return information and control command by host computer after, obtain the current redundant sub quantity of brachium pontis n
r, it is as follows to adjust redundant distribution coefficient method:
At first define the degree function of the submodule capacitance voltage offrating of j platform electronic equipment connection:
J=1,2 ..., m, m are the valve control electronic equipment total quantity that single brachium pontis connects;
u
CrSubmodule capacitance voltage rating number, u
CkBe the instantaneous numerical value of capacitance voltage of k submodule;
n
jSum for the submodule that connected of valve control electronic equipment of numbering j;
k
p, k
TBe respectively ratio and integral coefficient;
The direction symbol function of sig (i) expression brachium pontis current i is wherein got this brachium pontis charging current direction for just, and the discharging current direction is for bearing.
Work as f (j) as can be seen by above definition〉0, mean that this valve control electronic equipment need reduce redundant number, as f (j)＜0, mean that this valve control electronic equipment need increase redundant number, set simultaneously and adjust the dead band, when all valve control electronic equipment degree function at [δ, δ] in (δ〉0 be constant) scope, forbid adjusting redundant distribution coefficient, just start adjustment algorithm as long as there is a numerical value to exceed this scope, after f (j) sorted from small to large, in implementing, algorithm considers following three kinds of situations:
Situation one: f (j) has the condition of just forsaking one's love, positive needs reduce redundant number, and negative needs increase redundant number, among the f (j) the redundant number of one of maximum every minimizing the time, redundant number of just synchronous increase of minimum keeps the total redundant number of this brachium pontis constant like this among the f (j); Opposite extreme situations is that the redundant number of certain valve control electronic equipment becomes 0, and perhaps the total redundant number of this brachium pontis just stops to adjust redundant distribution coefficient this moment.
It all is positive situation that situation two: f (j) has, after sorting from small to large, redundant quantity of maximum every minimizing, distribute to for one that will reduce successively and ranked second, the 3rd, valve control electronic equipment, the difference of the capacitance voltage numerical value of the submodule that each the valve control electronic equipment of coming in this way to further gradually connects.
It all is the condition of forsaking one's love that situation three: f (j) has, according to after the ordering from small to large, and minimum redundant number of every increase, successively from ranked second, the 3rd ... valve control electronic equipment get.
The method of more than adjusting redundant number is to be undertaken by the distribution coefficient of periodically adjusting every deck valve control electronic equipment, this adjustment cycle can be the integral multiple in the dsp operation cycle of valve control electronic equipment, the method of adjusting is the degree function according to offrating, adjust this coefficient according to specifying step-length, the restriction principle of adjusting is: redundant number becomes 0, the total redundant number of perhaps single brachium pontis stops to adjust.
Setting redundant distribution coefficient adjustment step-length is
As f (j)〉0, the redundant number of this valve control electronic equipment of last one-period j is n
Rj=n
r* k
j, next cycle becomes
Next cycle becomes again
As f (j)＜0, the redundant number of this valve control electronic equipment of last one-period j is n
Rj=n
r* k
j, next cycle becomes
Next cycle becomes again
According to the restriction principle of periodically adjusting with upper type be: redundant number becomes 0, and the total redundant number of perhaps single brachium pontis stops to adjust.
Host computer is when issuing the order of input submodule number to every deck valve control electronic equipment, must be under the situation that keeps the redundant number of this valve control electronic equipment, the submodule of choosing corresponding number in remaining nonredundancy submodule is used for the work input, and method is the upper limit that remaining nonredundancy submodule number is dropped into the order of submodule quantity as this valve control electronic equipment.
Above embodiment only for explanation technological thought of the present invention, can not limit protection scope of the present invention with this, every technological thought that proposes according to the present invention, and any change of being done on the technical scheme basis all falls within the protection range of the present invention.
Claims (8)
1. flexible DC power transmission control system submodule redundant configuration method, in the described flexible DC power transmission control system, many deck valves control electronic equipment is connected with same brachium pontis, brachium pontis comprises redundant sub, it is characterized in that the content of described method is: each valve control electronic equipment returns to the submodule quantity that upper computer control system is in normal condition or malfunction by the optical-fibre communications agreement; Calculate the current redundant sub quantity of brachium pontis by host computer, Calculation Method is: maximal submodule quantity-fault submodule quantity that brachium pontis submodule sum-this brachium pontis normal work period drops into; On many deck valves control electronic equipment, pro rata distribute redundant sub then; Adjusting the redundant sub number is to be undertaken by the distribution coefficient of periodically adjusting every deck valve control electronic equipment.
2. a kind of flexible DC power transmission control system submodule redundant configuration method as claimed in claim 1, it is characterized in that: described adjustment cycle is the integral multiple in the dsp operation cycle of valve control electronic equipment.
3. a kind of flexible DC power transmission control system submodule redundant configuration method as claimed in claim 1, it is characterized in that: when valve control electronic equipment was the m platform, m was the integer more than or equal to 2, set redundant number allocation proportion coefficient k
j, coefficient satisfies relation: ∑ k
j=1,0≤k
j≤ 1, j=1 wherein, 2 ..., m, each valve control electronic equipment obtains redundant sub quantity n separately according to redundant number allocation proportion coefficient
Rj: n
Rj=n
r* k
j, wherein, n
rBe the current redundant sub quantity of brachium pontis.
4. a kind of flexible DC power transmission control system submodule redundant configuration method as claimed in claim 3 is characterized in that: after valve charging release operation, and redundant number allocation proportion coefficient k
jAdjustment calculating is to calculate according to the degree of the capacitance voltage offrating of current each submodule and in conjunction with the brachium pontis sense of current; The method of adjusting is the degree function according to offrating, and according to specifying step-length to adjust this coefficient, the restriction principle of adjustment is: redundant number becomes 0, and the total redundant number of perhaps single brachium pontis stops to adjust.
5. a kind of flexible DC power transmission control system submodule redundant configuration method as claimed in claim 3, it is characterized in that: before the charging, the maximal submodule quantity of duration of work input is to require to estimate according to the converter output level to obtain, the normal condition of returning according to each valve control electronic equipment or the submodule quantity of malfunction again, statistics obtains the submodule of brachium pontis fault, obtains the current redundant sub quantity of brachium pontis n thus
r
6. a kind of flexible DC power transmission control system submodule redundant configuration method as claimed in claim 3, it is characterized in that: setting valve control electronic equipment initial redundancy number adopts any one in following two kinds of methods: a kind of method is an equalitarian distribution method, promptly no matter every deck valve control electronic equipment connexon module number, the original allocation coefficient is 1/m, and wherein m is the integer more than or equal to 2; Another method is to distribute according to every deck valve control electronic equipment connexon module number ratio.
7. a kind of flexible DC power transmission control system submodule redundant configuration method as claimed in claim 3, it is characterized in that: cause this brachium pontis redundant sub quantity to reduce if brachium pontis submodule fault appears in run duration, when perhaps the maximal submodule quantity of this brachium pontis normal work period input changes, current redundant number will change, and adjust the back again according to redundant number allocation proportion coefficient k by host computer
jEvery deck valve control electronic equipment is distributed respectively.
8. a kind of flexible DC power transmission control system submodule redundant configuration method as claimed in claim 7, it is characterized in that: this brachium pontis normal work period, when every deck valve control electronic equipment transmitting order to lower levels drops into the submodule number, must be under the situation that keeps redundant number, the submodule of choosing corresponding number in remaining nonredundancy submodule is used for the work input, and method is the upper limit that remaining nonredundancy submodule number is dropped into the order of submodule quantity as this valve control electronic equipment.
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| CN103701347A (en) * | 2014-01-06 | 2014-04-02 | 东南大学 | Multi-target optimization-based MMC redundancy submodule configuration method |
| CN103904658A (en) * | 2014-03-31 | 2014-07-02 | 南方电网科学研究院有限责任公司 | Modularized multi-level converter with bridge arm redundancy function and control method thereof |
| CN105204482A (en) * | 2015-10-31 | 2015-12-30 | 南京南瑞继保电气有限公司 | Cascaded communication architecture applicable to modular multilevel converter control system |
| CN105610492A (en) * | 2015-12-31 | 2016-05-25 | 许继集团有限公司 | Optical fibre communication system and method for direct-current transmission converter valve monitoring system |
| CN107783519A (en) * | 2017-09-29 | 2018-03-09 | 南京南瑞继保电气有限公司 | A kind of converter valve Control protection system framework |
| CN109245285A (en) * | 2018-10-25 | 2019-01-18 | 南方电网科学研究院有限责任公司 | A kind of redundant topology structure of delta network |
| CN109407505A (en) * | 2018-10-25 | 2019-03-01 | 许继电气股份有限公司 | Direct current transportation valve group redundant measurement control system and its control of export method, apparatus |
| CN109586589A (en) * | 2018-11-19 | 2019-04-05 | 许继集团有限公司 | A kind of MMC, submodule put into a number calculating method, investment method and device |
| CN110391669A (en) * | 2019-07-24 | 2019-10-29 | 国网冀北电力有限公司检修分公司 | A kind of change of current valve control system |
| CN111478352A (en) * | 2020-03-25 | 2020-07-31 | 南方电网科学研究院有限责任公司 | Control method and device for flexible direct current transmission system and storage medium |
| CN111541362A (en) * | 2020-03-27 | 2020-08-14 | 山东大学 | Switching control method and system for MMC redundancy sub-module |
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| CN103701347A (en) * | 2014-01-06 | 2014-04-02 | 东南大学 | Multi-target optimization-based MMC redundancy submodule configuration method |
| CN103701347B (en) * | 2014-01-06 | 2016-05-04 | 东南大学 | A kind of MMC redundancy submodule collocation method based on multiple-objection optimization |
| CN103904658A (en) * | 2014-03-31 | 2014-07-02 | 南方电网科学研究院有限责任公司 | Modularized multi-level converter with bridge arm redundancy function and control method thereof |
| CN105204482A (en) * | 2015-10-31 | 2015-12-30 | 南京南瑞继保电气有限公司 | Cascaded communication architecture applicable to modular multilevel converter control system |
| CN105204482B (en) * | 2015-10-31 | 2018-02-16 | 南京南瑞继保电气有限公司 | Suitable for the cascade connection type communication construction of modularization multi-level converter control system |
| CN105610492A (en) * | 2015-12-31 | 2016-05-25 | 许继集团有限公司 | Optical fibre communication system and method for direct-current transmission converter valve monitoring system |
| CN105610492B (en) * | 2015-12-31 | 2018-01-23 | 许继集团有限公司 | A kind of optical fiber telecommunications system and method for direct-current transmission converter valve monitoring system |
| CN107783519A (en) * | 2017-09-29 | 2018-03-09 | 南京南瑞继保电气有限公司 | A kind of converter valve Control protection system framework |
| CN109245285A (en) * | 2018-10-25 | 2019-01-18 | 南方电网科学研究院有限责任公司 | A kind of redundant topology structure of delta network |
| CN109407505A (en) * | 2018-10-25 | 2019-03-01 | 许继电气股份有限公司 | Direct current transportation valve group redundant measurement control system and its control of export method, apparatus |
| CN109407505B (en) * | 2018-10-25 | 2022-12-02 | 许继电气股份有限公司 | Redundancy measurement control system of direct current transmission valve bank and outlet control method and device thereof |
| CN109245285B (en) * | 2018-10-25 | 2023-09-05 | 南方电网科学研究院有限责任公司 | Redundant topological structure of triangle circuit |
| CN109586589A (en) * | 2018-11-19 | 2019-04-05 | 许继集团有限公司 | A kind of MMC, submodule put into a number calculating method, investment method and device |
| CN110391669A (en) * | 2019-07-24 | 2019-10-29 | 国网冀北电力有限公司检修分公司 | A kind of change of current valve control system |
| CN111478352A (en) * | 2020-03-25 | 2020-07-31 | 南方电网科学研究院有限责任公司 | Control method and device for flexible direct current transmission system and storage medium |
| CN111478352B (en) * | 2020-03-25 | 2021-10-01 | 南方电网科学研究院有限责任公司 | Control method and device for flexible direct current transmission system and storage medium |
| CN111541362A (en) * | 2020-03-27 | 2020-08-14 | 山东大学 | Switching control method and system for MMC redundancy sub-module |
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