CN109905047A - A kind of MMC-STATCOM self-adaptive redundant operation method - Google Patents
A kind of MMC-STATCOM self-adaptive redundant operation method Download PDFInfo
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- CN109905047A CN109905047A CN201910196597.4A CN201910196597A CN109905047A CN 109905047 A CN109905047 A CN 109905047A CN 201910196597 A CN201910196597 A CN 201910196597A CN 109905047 A CN109905047 A CN 109905047A
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- submodule
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- bridge arm
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Abstract
The invention discloses a kind of MMC-STATCOM self-adaptive redundant operation methods, when MMC-STATCOM is operated normally, judge whether it has sub-module fault, when finding sub-module fault, different measure is taken according to the control model of MMC-STATCOM: when MMC-STATCOM is in permanent idle control model, only cutting off failure submodule and another bridge arm symmetric position submodule in phase where failure submodule.When MMC-STATCOM is in constant voltage control model, while cutting off the submodule of failure submodule and all symmetric positions of each bridge arm of three-phase.Present invention aims at imbalance of three-phase voltage when solving the problems, such as that sub-module fault occurs for irredundant submodule MMC-STATCOM, and three-phase voltage balances when realizing sub-module fault, keeps the stable operation of system.
Description
Technical field
The present invention relates to the static synchronous compensator of MMC topology more particularly to a kind of MMC-STATCOM self-adaptive redundant to transport
Row method.
Background technique
MMC is a kind of multilevel converter, and by three phase compositions, three-phase shares a DC bus, and every phase includes two bridges
Arm, each bridge arm are composed in series by multiple submodule.Use the controllable switch elements such as insulated gate bipolar transistor (IGBT), tool
There is the features such as output harmonic wave is few, the degree of modularity is high, thus be with a wide range of applications in the power system, is commonly applied to height
Press direct current transportation (HVDC), static synchronous compensator (STATCOM) etc..
Compared with traditional more level-type static synchronous compensator, the MMC type static synchronous compensator degree of modularity is high, expands
The features such as malleability is good, voltage waveform is high-quality, percent harmonic distortion is low, switching loss is low, fault clearance ability is strong.When operation neutron
When module breaks down, imbalance of three-phase voltage can be caused, lead to system break, influence the stable operation of system.At present usually
Influence of the sub-module fault to system is avoided using the method for configuring redundancy submodule, but is configured in MMC-STATCOM superfluous
Minor module still remains some shortcomings, on the one hand will increase capital investment, reduces efficiency, on the other hand can also increase system control
The difficulty of system.And there is sub-module fault when certain bridge arm is available without more redundancy submodules and will lead to three-phase voltage not
Equilibrium problem influences the stable operation of system.
Summary of the invention
A kind of MMC-STATCOM self-adaptive redundant operation method provided by the invention, it is therefore intended that solve irredundant submodule
Imbalance of three-phase voltage problem when sub-module fault occurs for block MMC-STATCOM, and three-phase voltage balances when realizing sub-module fault,
The stable operation of holding system.
To realize above-mentioned technical purpose and the technique effect, the present invention includes the following steps:
S1.MMC-STATCOM is operated normally, and judges whether it has sub-module fault.
If S2. faulty, S3 or S4 are entered according to the control model of MMC-STATCOM；If without failure, end of run.
S3. it when MMC-STATCOM is in permanent idle control model, only cuts off failure submodule and is in failure submodule
Another bridge arm symmetric position submodule of place phase (abbreviation failure phase)；All submodules that failure is not removed mutually are adjusted simultaneously
Cell voltage control instruction keeps mutually all submodule output voltages equal with all submodule output voltages of other two-phases.
S4. when MMC-STATCOM is in constant voltage control model, while failure submodule and each bridge arm institute of three-phase being cut off
There is the submodule of symmetric position, and adjust the cell voltage control instruction that all phases are not removed submodule, keeps DC side
Busbar voltage is constant.
Further, in the step S3, all submodules of non-faulting phase upper and lower bridge arm keep output rating unit voltage
It is constant.
Further, in the step S3, failure is not removed submodule unit voltage control instructions mutuallyAccording to following formula
It calculates:
Wherein, UdFor DC side voltage rating, N is the number of former bridge arm submodule, and x is failure submodule number.
Further, in the step S4, each cell voltage control instruction for not being removed submodule mutuallyAccording to following formula
It calculates:
Wherein, UdFor DC side voltage rating, N is the number of former bridge arm submodule, and x is failure submodule number.
Further, the submodule number range and submodule capacitor pressure resistance multiple and bridge arm submodule quantity to break down
It is related, meet following formula:
Wherein, k is submodule capacitor pressure resistance multiple, and N is the number of former bridge arm submodule.
Further, each bridge arm of MMC-STATCOM three-phase is without additional setting redundancy submodule.
Beneficial effect
A kind of MMC-STATCOM self-adaptive redundant operation method provided by the invention, when running MMC-STATCOM
When module breaks down, electricity when the idle control model with perseverance higher to voltage waveform quality requirement when according to constant voltage control model
Corrugating requires less high feature, devises different schemes, allows MMC-STATCOM in the subsequent reforwarding of sub-module fault
Row is reduced and is damaged caused by system break, and can neatly adjust the replacement and maintenance project of failure submodule；Simultaneously should
Inventive method also eliminates the demand of MMC-STATCOM configuring redundancy submodule.
Detailed description of the invention
Fig. 1 is the flow chart of MMC-STATCOM self-adaptive redundant operation method；
Fig. 2 is MMC-STATCOM structural schematic diagram；
Sub-module fault excision schematic diagram when Fig. 3 is MMC-STATCOM perseverance idle mode；
Sub-module fault cuts off schematic diagram when Fig. 4 is MMC-STATCOM constant voltage mode.
Specific embodiment
The present invention is described in further detail in the following with reference to the drawings and specific embodiments.
As shown in Fig. 1, it is determined when the control model of MMC-STATCOM by the practical demand for control for being applicable in scene, this hair
Bright specific embodiment is to take corresponding mode when sub-module fault occurs according to MMC-STATCOM under different control models,
Imbalance of three-phase voltage is avoided, the operational reliability of system is improved.
Fig. 2 is the structural schematic diagram for illustrating MMC-STATCOM according to one embodiment of present invention.As shown, MMC-
STATCOM is divided into two bridge arms up and down by A, tri- phase composition of B, C, every phase, and upper and lower bridge arm is again respectively by N number of identical submodule
With a bridge arm reactance L0It is in series.The alternating voltage of three-phase is passed through by exchange end a, b and c output, these output voltages
Reactor LsIt is connected to three-phase AC grid.
MMC-STATCOM makes to exchange the expected alternating current of end output by controlling the output voltage when operation of each submodule
Pressure, while the sum of all submodule AC port voltages of each bridge arm being kept to be equal to DC bus-bar voltage.By taking A phase as an example, if UdFor
Voltage between DC side positive and negative busbar, UcFor the DC capacitor voltage of submodule, and assume mutually all submodule direct currents
It is equal to hold voltage, DC side busbar voltage such as following formula in normal course of operation can be obtained:
Ud=NUC
When some running submodule is broken down or is unable to run due to any, with bridge arm in A phase
For module, the output voltage values of A phase bridge arm can be less than the output voltage values of other two-phase bridge arms at this time, cause three-phase uneven
Weighing apparatus, prolonged imbalance can cause system break.
System outage in order to prevent, while meeting the demand of the different operational modes of MMC-STATCOM, using difference
Measure cope with the sub-module fault problem under different operational modes.
If MMC-STATCOM is in permanent idle mode, bridge arm submodule 1 breaks down in A phase, it is contemplated that permanent idle mode
It is of less demanding to three-phase alternating voltage waveform quality, the submodule of the failure submodule and lower bridge arm corresponding position is only cut off, such as
Shown in Fig. 3.At this moment, A phase supplies DC voltage and becomes this and be divided by cut off the sum of other outer submodule voltages of submodule, uses formula
It is represented by
In order to keep the balance of voltage, control B, C two-phase submodule unit output voltage is still rating unit output voltage
Uc, A phase is in addition to other submodule output voltage such as following formulas of two submodule external control systems of excision
If MMC-STATCOM is in constant voltage mode, bridge arm submodule 1 breaks down in A phase, it is contemplated that constant voltage mode
It is more demanding to three-phase alternating voltage waveform quality, in order to maintain the symmetrical of three-phase voltage waveform, cut off the failure submodule and
The submodule of other 5 bridge arm corresponding positions, as shown in Figure 4.At this moment, the voltage of each mutually supply DC side becomes excision of being respectively divided by
The sum of other outer submodule voltages of submodule, are represented by with formula
In order to maintain DC side busbar voltage to stablize, each phase other submodules output electricity other than the submodule of excision is controlled
Pressure such as following formula
Assuming that each bridge arm submodule quantity is 10 in the MMC-STATCOM, DC side voltage rating is 10KV,
The rating unit output voltage of each submodule is 1KV.Under permanent idle control model, when event occurs for bridge arm submodule 1 in A phase
When barrier, the submodule 1 of A phase upper and lower bridge arm is cut off, B, C two-phase are constant, and remaining submodule output voltage is adjusted to by A phase
1.25KV.Under constant voltage control model, when bridge arm submodule 1 breaks down in A phase, the submodule of three-phase upper and lower bridge arm is cut off
Block 1, and remaining submodule output voltage is adjusted to 1.25KV by each phase.In addition, the submodule capacitor with the MMC-STATCOM is
For 1.5 times of pressure resistances, can calculate this method be suitable for the submodule number that breaks down be 3 and within.
The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, the ordinary skill people of fields
Member referring to above-described embodiment still can with modifications or equivalent substitutions are made to specific embodiments of the invention, these without departing from
Any modification of spirit and scope of the invention or equivalent replacement are applying for pending claims of the invention
Within.
Claims (5)
1. a kind of MMC-STATCOM self-adaptive redundant operation method, which comprises the following steps:
S1.MMC-STATCOM is operated normally, and judges whether it has sub-module fault；
If S2. faulty, S3 or S4 are entered according to the control model of MMC-STATCOM；If without failure, end of run；
S3. when MMC-STATCOM is in permanent idle control model, failure submodule is cut off and in phase where failure submodule
Another bridge arm symmetric position submodule；All submodule unit voltage control instructions that failure is not removed mutually are adjusted simultaneously,
Keep mutually all submodule output voltages equal with all submodule output voltages of other two-phases；
S4. when MMC-STATCOM is in constant voltage control model, while failure submodule is cut off and each bridge arm of three-phase is all right
Claim the submodule of position, and adjust the cell voltage control instruction that all phases are not removed submodule, keeps direct current side bus
Voltage is constant.
2. MMC-STATCOM self-adaptive redundant operation method according to claim 1, which is characterized in that the step S3
In, all submodules of non-faulting phase upper and lower bridge arm keep output rating unit voltage constant.
3. MMC-STATCOM self-adaptive redundant operation method according to claim 1, which is characterized in that the step S3
In, failure is not removed submodule unit voltage control instructions mutuallyIt is calculated according to following formula:
Wherein, UdFor DC side voltage rating, N is the number of former bridge arm submodule, and x is failure submodule number.
4. MMC-STATCOM self-adaptive redundant operation method according to claim 1, which is characterized in that the step S4
In, each cell voltage control instruction for not being removed submodule mutuallyIt is calculated according to following formula:
Wherein, UdFor DC side voltage rating, N is the number of former bridge arm submodule, and x is failure submodule number.
5. MMC-STATCOM self-adaptive redundant operation method according to claim 1, which is characterized in that break down
Submodule number range is related with submodule capacitor pressure resistance multiple and bridge arm submodule quantity, meets following formula:
Wherein, k is submodule capacitor pressure resistance multiple, and N is the number of former bridge arm submodule.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112260293A (en) * | 2020-09-03 | 2021-01-22 | 南京南瑞继保电气有限公司 | Split-phase redundancy control method and control system for series current converter |
| CN113972818A (en) * | 2021-09-27 | 2022-01-25 | 国网江苏省电力有限公司电力科学研究院 | Fault-tolerant operation method and device under modular multilevel converter submodule fault |
| CN114448228A (en) * | 2022-04-11 | 2022-05-06 | 南京力骏新能源储能研究院有限公司 | Redundancy control method and system of direct-hanging energy storage converter based on port voltage state discrimination |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112260293A (en) * | 2020-09-03 | 2021-01-22 | 南京南瑞继保电气有限公司 | Split-phase redundancy control method and control system for series current converter |
| CN112260293B (en) * | 2020-09-03 | 2022-07-22 | 南京南瑞继保电气有限公司 | Split-phase redundancy control method and control system for series current converter |
| CN113972818A (en) * | 2021-09-27 | 2022-01-25 | 国网江苏省电力有限公司电力科学研究院 | Fault-tolerant operation method and device under modular multilevel converter submodule fault |
| CN113972818B (en) * | 2021-09-27 | 2024-04-02 | 国网江苏省电力有限公司电力科学研究院 | Fault-tolerant operation method and device under fault of submodule of modularized multi-level converter |
| CN114448228A (en) * | 2022-04-11 | 2022-05-06 | 南京力骏新能源储能研究院有限公司 | Redundancy control method and system of direct-hanging energy storage converter based on port voltage state discrimination |
| CN114448228B (en) * | 2022-04-11 | 2022-06-17 | 南京力骏新能源储能研究院有限公司 | Redundancy control method and system for direct-hanging energy storage converter based on port voltage state discrimination |
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