CN105634259A - Reliability analysis and redundancy configuration calculation method for hybrid modular multilevel converter - Google Patents

Reliability analysis and redundancy configuration calculation method for hybrid modular multilevel converter Download PDF

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CN105634259A
CN105634259A CN201510272888.9A CN201510272888A CN105634259A CN 105634259 A CN105634259 A CN 105634259A CN 201510272888 A CN201510272888 A CN 201510272888A CN 105634259 A CN105634259 A CN 105634259A
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mmc
redundancy
step
reliability
multilevel converter
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CN201510272888.9A
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CN105634259B (en
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许建中
赵成勇
赵鹏豪
袁艺嘉
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华北电力大学
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Abstract

The invention relates to a reliability analysis and redundancy configuration calculation method for a hybrid modular multilevel converter. The reliability analysis and redundancy configuration calculation method has the beneficial effects as follows: under the premise of ensuring reliable direct current fault current cut-off of the hybrid modular multilevel converter, an initial critical proportion of the number of different types of sub modules of the hybrid modular multilevel converter is analyzed, and an optimized redundancy sub module configuration method for the hybrid modular multilevel converter is further proposed. The method considers the reliability of the converter as well as the effective utilization ratio of an insulated gate bipolar transistor in the redundancy sub modules, so that reliability and economical efficiency are both taken into consideration. The reliability analysis and redundancy configuration calculation method proposed by the invention can provide references to engineering design.

Description

The fail-safe analysis of a kind of hybrid guided mode massing multilevel converter and redundant configuration computational methods

Technical field

The invention belongs to power transmission and distribution technical field, particularly relate to fail-safe analysis and the redundant configuration computational methods of a kind of hybrid guided mode massing multilevel converter.

Background technology

Modular multilevel converter type HVDC transmission system (Modularmultilevelconverterbasedhighvoltagedirectcurrent, MMC-HVDC) is obtaining increasingly extensive concern. Compare with traditional two level and three-level voltage source inverter (Voltage-sourcedConverter, VSC), MMC have without a large amount of IGBT connect, device bear the advantages such as voltage change ratio is low, output waveform harmonic content is relatively low. Predictably, MMC-HVDC more will be widely applied in future.

At present, direct-current short circuit fault is a major issue of MMC-HVDC. Practical Project many employings half-bridge submodule (Half-bridgeSub-module, HBSM), but it does not possess DC Line Fault ride-through capability, significantly limit its application in aerial line field. Dc circuit breaker (DCCircuitBreaker, DCCB) is although direct-current short circuit fault can be promptly isolated, but owing to technology is immature, dc circuit breaker still rarely has application in high-voltage large-capacity occasion. Under such technical background, actual and the feasible scheme of a kind of comparison is to adopt to have and the submodule topology of clamp direct fault current can possess the MMC of DC Line Fault ride-through capability with composition, main full-bridge submodule (Full-bridgeSub-module, FBSM), double; two clamp submodule (Clamp-doubleSub-module, CDSM), single clamp submodule (Clamp-singleSub-module, CSSM). But compared with HBSM, the submodule topology with direct fault current clamping ability needs more power electronic devices, and cost is higher. A kind of comparatively feasible technical scheme is to adopt the mixing MMC being made up of two kinds of submodule topology, and one of which is HBSM, and another kind of submodule topology possesses direct fault current clamping ability. Two seed module topology common support DC current under stable situation, locking inverter under direct-current short circuit failure condition, is cut off DC Line Fault by the submodule topology possessing direct fault current clamping ability.

In Practical Project, each brachium pontis of MMC has up to a hundred submodules, and sub-module fault likely can occur at any time in engineering, therefore, often configures the redundancy submodule of some. Reliability and the construction costs of MMC are had material impact by the number of redundancy submodule. Owing to mixing MMC is generally by two kinds of submodule topology formation, the redundant configuration of two types submodule influences each other, thus the redundant configuration of mixing MMC is an extremely complex decision making process, and the reliability and economy to engineering has material impact.

Summary of the invention

The technical problem to be solved is fail-safe analysis and the submodule redundancy configuration method of mixing MMC. For the ease of the method is described, the present invention illustrates for the mixing MMC being made up of HBSM and CSSM, and wherein CSSM has direct fault current clamping ability.

Described method specifically includes following steps:

Step 1: reliably pass through premised on DC bipolar short trouble mixing MMC, when being left out redundancy, calculates in steady-state operation situation the minimum scale of CSSM number in each brachium pontis.

Step 2: set up the redundancy number of mixing MMC and the relational model of reliability, calculates the reliability of the mixing MMC based on HBSM and CSSMR MMC;

Step 3: definitionN 0HWithN 0CSRespectively the redundancy submodule number of HBSM and CSSM in each brachium pontis, utilizes single order backward difference to calculate respectivelyR MMCRightN 0HWithN 0CSRate of change;

Step 4: screening marginal value, whenN 0HWithN 0CSValue more than marginal value time,R MMCGrowth only small (less than set threshold value);

Step 5: calculate the effective rate of utilization of igbt in marginal value place redundancy submodule;

Step 6: take into account the impact of the redundant module number reliability effect on mixing MMC and economy, set up the object function considering weight, utilize marginal value place in step 3R MMCWith the optimal redundancy configuration that result of calculation in step 4 selects mixing MMC Neutron module.

By above 6 steps, the present invention under ensureing the mixing MMC premise reliably cutting off direct fault current, based on the fail-safe analysis mixing MMC, can calculate the optimal redundancy configuration of mixing MMC, provide reference for engineering design.

Accompanying drawing explanation

Fig. 1 is the Basic Topological of MMC, and wherein SM represents submodule (Sub-module, SM),LFor brachium pontis reactor,U dcFor DC voltage. Fig. 2 is the topological structure of HBSM, and wherein T1, T2 represent igbt (InsulatedGateBipolarTransistor, IGBT), and D1, D2 represent diode, and C represents electric capacity,U CFor capacitance voltage, when dotted line is converter blocking under the different senses of current current path in submodule. Fig. 3 is the topological structure of CSSM, and wherein T1, T2 and T3 represent that IGBT, D1, D2, D3 and D4 represent diode, when dotted line is converter blocking under the different senses of current current path in submodule. Mixing the current path in MMC when Fig. 4 is locking, wherein dotted line is current path, brachium pontis brachium pontis lower to C phase in A phase.

Detailed description of the invention

The fail-safe analysis mixing MMC that the present invention relates to and redundancy calculation methods will be described in detail below. It is emphasized that the description below is merely exemplary, rather than in order to limit the scope of the present invention and application thereof.

The technical problem to be solved is under ensureing the premise of DC Line Fault ride-through capability of mixing MMC, selects the optimal allocation scheme of mixing MMC by calculating the effective rate of utilization of IGBT in the reliability and redundancy submodule mixing MMC. The present invention adopts the following technical scheme that realization:

The present invention is realized by step following six:

Step 1: reliably pass through premised on DC bipolar short trouble mixing MMC, when being left out redundancy, calculates in steady-state operation situation the minimum scale of CSSM number in each brachium pontis.

When disregarding redundancy, it is assumed that the number of HBSM and CSSM module required in the mixing each brachium pontis of MMC is respectivelyN HWithN CS, submodule capacitor voltage isU C, then mixing MMC DC voltageU dcAnd between alternating voltage shown in relation such as formula (1).

(1)

In formula (1),mFor modulation than (m< 1),U phWithU LThe respectively amplitude of converter power transformer secondary ac phase voltage and line voltage. As shown in Figure 4, fault current flows between out of phase upper and lower bridge arm, and in A phase, brachium pontis illustrates with the lower brachium pontis of C phase. Fault current path has 2N CSIndividual capacitances in series, in order to ensure the DC Line Fault ride-through capability of mixing MMC, the CSSM number in each brachium pontis should meet the requirement of formula (2).

(2)

In conjunction with formula (1) and formula (2), it is possible to obtain the number ratio of CSSM in each brachium pontis, as shown in Equation (3):

(3)

Step 2: set up the redundancy number of mixing MMC and the relational model of reliability, calculates the reliability of the mixing MMC based on HBSM and CSSMR MMC��

Owing to 6 brachium pontis of MMC are electrically full symmetric, therefore, the reliability of a brachium pontis can represent the reliability of MMC to a certain extent, and the present invention represents the reliability of MMC with the reliability of a brachium pontis. If the number of HBSM and the CSSM broken down in each brachium pontis is respectivelyi HWithi CS, owing in brachium pontis, the number of CSSM affects the DC Line Fault ride-through capability of MMC. In order to ensure the reliability of MMC, the CSSM of regulation redundancy may be used for substituting HBSM and the CSSM broken down, and the HBSM of redundancy only can substitute the HBSM broken down, and the CSSM broken down can not be substituted, CSSM decreased number that otherwise can be properly functioning in brachium pontis, it is possible to make mixing MMC lose DC Line Fault ride-through capability. Therefore, the difference according to the submodule number broken down, Calculation of Reliability should include two parts:

1)i H��N0H,i CS��N 0CS, now MMC reliability isR 1, as shown in formula (4):

(4)

2)i H>N 0H,i CS��N 0H+N 0CS-i H, now MMC reliability isR 2, as shown in formula (5):

(5)

In formula (4) and formula (5)CFor number of combinations. Consider the reliability of the mixing MMC after above-mentioned two situationsR MMCCan be expressed as by formula (6):

(6)

For the ease of calculating, willR MMCValue put into matrixRIn, as shown in formula (7):

(7)

Wherein,N HWithN CSThe number of HBSM and CSSM in each brachium pontis in respectively steady-state operation situation,N 0HWithN 0CSThe respectively redundancy number of HBSM and CSSM in each brachium pontis,N 0HmWithN 0CSmIt is respectivelyN 0HWithN 0CSMaximum, namelyN 0HFrom 1 toN 0HmChange,N 0CSFrom 1 toN 0CSmChange, corresponding each groupN 0HWithN 0CSValue, can calculate correspondingR MMC, that is calculate the reliability of inverter under different redundant configuration. It should be noted thati H��i CS��N 0H��N 0CS��N 0HmWithN 0CSmIt is integer.

Step 3: definitionN 0HWithN 0CSRespectively the redundancy submodule number of HBSM and CSSM in each brachium pontis, utilizes single order backward difference to calculate respectivelyR MMCRightN 0HWithN 0CSRate of change.

BecauseN 0HWithN 0CSIt is positive number, is therefore obtained by step 1R MMCBe aboutN 0HWithN 0CSBinary discrete function. For discrete data, using differential approximate representationR MMCAlong withN 0HWithN 0CSChanging Pattern.

For the ease of calculating, willR MMCRightN 0HWithN 0CSSingle order backward difference be respectively put into matrixD HWithD CSIn, matrixD HWithD CSThe computational methods of middle element are respectively as shown in formula (8) and (9).

(8)

(9)

Step 4: screening marginal value, whenN 0HWithN 0CSValue more than marginal value time,R MMCGrowth only small (less than set threshold value);

Set threshold valuet, then select shown in method such as formula (10) and the formula (11) of critical point.

(10)

(11)

Meet formula (10) and formula (11)N 0HWithN 0CSValue be marginal value.

Step 5: calculate the effective rate of utilization of igbt in marginal value place redundancy submodule.

First effective number of IGBT in computing redundancy submodule, similar with Calculation of Reliability, and in redundancy submodule, IGBT significant figure purpose calculates and is also classified into two parts, respectively as shown in formula (12) and formula (13):

(12)

(13)

Then effective number of IGBT in redundancy submoduleQCan be represented by formula (14):

(14)

The effective rate of utilization of IGBT in redundancy submodule��Definition such as formula (15) shown in:

(15)

Step 6: take into account the impact of the redundant module number reliability effect on mixing MMC and economy, set up the object function considering weight, utilize marginal value place in step 3R MMCWith the optimal redundancy configuration that result of calculation in step 4 selects mixing MMC Neutron module.

In order to consider the effective rate of utilization of IGBT in the impact on mixing MMC reliability of the redundant module number and redundant module, it is proposed that object function as shown in Equation (16):

(16)

Wherein�� 1With�� 2For weight coefficient. The calculating use of object function is obtained by formula (10) and (11)N 0HWithN 0CSMarginal value. With object functionFMaximum correspondingN 0HWithN 0CSIt is the optimal redundancy configuration of mixing MMC.

The beneficial effects of the present invention is, to ensure that mixing MMC reliably cuts off premised on direct fault current, analyze the initial criticality ratio of dissimilar submodule number in mixing MMC, and then proposing the optimal redundancy submodule configuration method of mixing MMC, the method considers the effective rate of utilization of IGBT in the reliability of inverter and redundancy submodule simultaneously.

Fail-safe analysis proposed by the invention and optimal redundancy collocation method can be applied to any by mixing MMC that is dissimilar and that comprise two or more type submodule topology, have engineering practical value.

The above; being only the present invention preferably detailed description of the invention, but protection scope of the present invention is not limited thereto, any those familiar with the art is in the technical scope that the invention discloses; the change that can readily occur in or replacement, all should be encompassed within protection scope of the present invention. Therefore, protection scope of the present invention should be as the criterion with scope of the claims.

Claims (2)

1. the fail-safe analysis of a hybrid guided mode massing multilevel converter and redundant configuration computational methods, it is characterized in that ensureing hybrid guided mode massing multilevel converter (ModularMultilevelConverter, under the premise of DC Line Fault ride-through capability MMC), the optimal allocation scheme of mixing MMC is selected by the effective rate of utilization of igbt in the reliability of calculating hybrid guided mode massing multilevel converter and redundancy submodule, comprise the following steps: step 1: reliably pass through premised on DC bipolar short trouble mixing MMC, when being left out redundancy, single clamp submodule (ClampSingleSub-module in each brachium pontis in calculating steady-state operation situation, CSSM) minimum scale of number, step 2: set up the redundancy number of mixing MMC and the relational model of reliability, calculate based on half-bridge submodule (HalfBridgeSub-module, HBSM) and CSSM mixing MMC reliabilityR MMC; Step 3: definitionN 0HWithN 0CSRespectively the redundancy submodule number of HBSM and CSSM in each brachium pontis, utilizes single order backward difference to calculate respectivelyR MMCRightN 0HWithN 0CSRate of change; Step 4: screening marginal value, whenN 0HWithN 0CSValue more than marginal value time,R MMCGrowth only small (less than set threshold value); Step 5: calculate the effective rate of utilization of igbt in marginal value place redundancy submodule; Step 6: take into account the impact of the redundant module number reliability effect on mixing MMC and economy, set up the object function considering weight, utilize marginal value place in step 3R MMCWith the optimal redundancy configuration that result of calculation in step 4 selects mixing MMC Neutron module.
2. based on the fail-safe analysis of a kind of hybrid guided mode massing multilevel converter described in claim 1 and redundant configuration computational methods, it is characterized in that step 1,2,3,4,5 and 6 entirety are as summary of the invention, and 6 steps are organic indivisible entirety.
CN201510272888.9A 2015-05-26 2015-05-26 A kind of fail-safe analysis and redundant configuration calculation method of mixing module multilevel converter CN105634259B (en)

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CN106452143A (en) * 2016-10-31 2017-02-22 华北电力大学 MMC (modular multi-level converter) hot redundancy strategy based on carrier phase-shifting
CN107748313A (en) * 2017-10-16 2018-03-02 华北电力大学 Based on or logic identification HBSM MMC internal short circuit faults method
CN109510495A (en) * 2018-12-12 2019-03-22 长沙理工大学 The mixed type MMC inverter Cost Optimization Approach blocked based on DC Line Fault
CN110061483A (en) * 2019-05-28 2019-07-26 华北电力大学 The reciprocal current-limiting type high voltage DC breaker of single clamper modular type with flow-limiting valve section
CN110112944A (en) * 2019-05-28 2019-08-09 福州大学 Modularization multi-level converter analysis method for reliability based on Copula function
CN110112716A (en) * 2019-05-28 2019-08-09 华北电力大学 The reciprocal current-limiting type high voltage DC breaker of single clamper modular type with diode bidirectional bridge

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CN102867124A (en) * 2012-09-12 2013-01-09 华北电力大学 Calculation method of redundancy configuration and reliability of MMC (Multi Media Card) submodule
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CN106452143A (en) * 2016-10-31 2017-02-22 华北电力大学 MMC (modular multi-level converter) hot redundancy strategy based on carrier phase-shifting
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CN107748313B (en) * 2017-10-16 2019-12-03 华北电力大学 Based on or logic identification HBSM-MMC internal short circuit fault method
CN109510495A (en) * 2018-12-12 2019-03-22 长沙理工大学 The mixed type MMC inverter Cost Optimization Approach blocked based on DC Line Fault
CN110061483A (en) * 2019-05-28 2019-07-26 华北电力大学 The reciprocal current-limiting type high voltage DC breaker of single clamper modular type with flow-limiting valve section
CN110112944A (en) * 2019-05-28 2019-08-09 福州大学 Modularization multi-level converter analysis method for reliability based on Copula function
CN110112716A (en) * 2019-05-28 2019-08-09 华北电力大学 The reciprocal current-limiting type high voltage DC breaker of single clamper modular type with diode bidirectional bridge

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