CN108155814A - MMC converter valves pressure equalizing control method based on temperature - Google Patents

MMC converter valves pressure equalizing control method based on temperature Download PDF

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Publication number
CN108155814A
CN108155814A CN201810011484.8A CN201810011484A CN108155814A CN 108155814 A CN108155814 A CN 108155814A CN 201810011484 A CN201810011484 A CN 201810011484A CN 108155814 A CN108155814 A CN 108155814A
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submodule
controlling cycle
temperature
previous controlling
bridge arm
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CN108155814B (en
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荣飞
李鸿鑫
李文君
周保荣
饶宏
黄守道
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Hunan University
CSG Electric Power Research Institute
Research Institute of Southern Power Grid Co Ltd
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Hunan University
Research Institute of Southern Power Grid Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Abstract

The invention discloses a kind of MMC converter valves pressure equalizing control methods based on temperature, calculate the temperature and voltage of all submodules in previous controlling cycle first, then by each submodule deblocking temperature T of previous controlling cycle1~TNRespectively with reference temperature T0Compare, changing temperature at current time is more than T0Submodule switching state；For other submodules, submodule evaluation index is introduced, with reference to the previous controlling cycle bridge arm current, current time is selected to need the module for putting into or cutting off.The present invention controls the Wen Sheng of IGBT module, improves the service life of device, so as to enhance the reliability of MMC converter valves, improve the working performance of MMC converter valves on the whole by being optimized to traditional pressure equalizing control method.

Description

MMC converter valves pressure equalizing control method based on temperature
Technical field
The invention belongs to high-voltage and high-power power electronic technical field, more particularly to a kind of MMC converter valves based on temperature Pressure equalizing control method.
Background technology
Industrial quarters shows that power semiconductor failure accounts for entire electricity to the questionnaire survey of fragile electronic power parts The 34% of power electronic system, the service life of power device is very sensitive for temperature fluctuation, and fluctuating range often increases by 10 DEG C, service life drop Low about 70%, therefore, the reliability for improving power semiconductor is the key that improve system reliability.With regenerative resource The development of generation technology and the development of Power Electronic Technique and application, system power supply reliability become the weight of domestic and foreign scholars' research The reliability consideration of point, wherein power semiconductor becomes the most important thing.The power of current transformer is partly led in wind-powered electricity generation electricity generation system The crash rate highest of body device, the coefficient of expansion for being primarily due to IGBT device layers of material is different, and the thermal stress born is different, Prolonged accumulation causes the thermal fatigue failure of device.The basic reason for leading to device heat fatigue is the amplitude and temperature of device temperature The fluctuation of degree, the influence of especially temperature amplitude are particularly evident.
Therefore, it is necessary to study a kind of power semiconductor that can improve current transformer in wind-powered electricity generation electricity generation system is reliable Property, so as to improve the control method of wind-powered electricity generation Generation System Reliability.
Invention content
The purpose of the present invention is to provide a kind of MMC converter valves pressure equalizing control method based on temperature, which extends The service life of device improves the reliability of MMC converter valves, makes the operation of flexible direct current power transmission system more economical, efficient.
Technical solution provided by the present invention is：
A kind of MMC converter valves pressure equalizing control method based on temperature, the MMC converter valves are made of six bridge arms, Mei Geqiao Arm includes the identical submodule of N number of structure and a bridge arm inductance, and each submodule is a half-bridge structure, including two IGBT Module and a storage capacitor；
In pressure equalizing control method, the control method of six bridge arms is identical, and to each bridge arm, following steps progress is respectively adopted Pressure and Control：
Step 1：Two IGBT modules are obtained in the bridge arm in each submodule in the junction temperature of previous controlling cycle, take two Higher value in junction temperature as corresponding submodule previous controlling cycle temperature；Use TjRepresent previous j-th of son of controlling cycle The temperature of module, j=1,2 ..., N；
Step 2：By each submodule deblocking temperature T of previous controlling cycle1~TNRespectively with reference temperature T0Compare, temperature is more than T0Submodule be denoted as SM1~SMm, m are more than T for temperature0Submodule number；T0For empirical parameter；
If SM1It is m in the submodule number that previous controlling cycle is excision state in~SMm1It is a, it is remaining for input shape The submodule of state；Change the switching state of this m submodule at current time, i.e., previous controlling cycle is the submodule of excision state Block becomes input state at current time, and previous controlling cycle becomes cutting off shape at current time for the submodule of input state State；Use n1And n2Previous controlling cycle and the submodule number that current time bridge arm needs are put into are represented respectively, then are also needed additional The submodule number of input is Δ n=n2-n1+m-2·m1；
Step 3：SM is removed in the bridge arm1~SMmSubmodule in addition is denoted as SMm+1~SMN；Introduce submodule evaluation index Mj, computational submodule SMm+1~SMNCorresponding MjValue：
Mj=Uj+λ·Tj
Wherein, MjRepresent submodule SMjCorresponding evaluation index value, UjRepresent previous controlling cycle submodule SMjElectricity Pressure, j=m+1,2 ..., N, UjIt is obtained by measuring；λ is the weight coefficient of submodule deblocking temperature, is empirical parameter；
Step 4：With reference to the previous controlling cycle bridge arm current and the corresponding M of submodulejValue selects current time to need to throw The n submodule of Δ for entering or cutting off：
Situation 1：The previous controlling cycle bridge arm current is timing, according to the submodule of pressure equilibrium principle selection switching：
1. if Δ n >=0, puts into the M of submodulejBe worth it is the smaller the better, therefore by SMm+1~SMNIn previous controlling cycle to cut Except the submodule of state presses its MjValue size is ranked up, and puts into wherein MjIt is worth minimum n submodule of Δ, remaining N-m- Δ n A submodule switching state is remained unchanged relative to previous controlling cycle；
If 2. Δ n<0, it is desirable to reduce the submodule number of input, by SMm+1~SMNIn previous controlling cycle for input shape The submodule of state presses MjValue size is ranked up, and cuts off wherein MjValue maximum | Δ n | a submodule, remaining N-m- | Δ n | it is a Submodule switching state is remained unchanged relative to previous controlling cycle；
Situation 2：When the previous controlling cycle bridge arm current is negative, according to the submodule for flattening weighing apparatus control principle selection switching Block：
1. if Δ n >=0, puts into the M of submodulejValue is the bigger the better, therefore by SMm+1~SMNIn previous controlling cycle to cut Except the submodule of state presses MjValue size is ranked up, and puts into wherein MjIt is worth maximum n submodule of Δ, remaining N-m- Δ n Submodule switching state is remained unchanged relative to previous controlling cycle；
If 2. Δ n<0, it is desirable to reduce the submodule of input, by SMm+1~SMNIn previous controlling cycle for input state Submodule presses MjValue size is ranked up, and cuts off wherein MjValue minimum | Δ n | a submodule, remaining N-m- | Δ n | a submodule Block switching state is remained unchanged relative to previous controlling cycle.
Further, in the step 1, the device handbook provided first according to device production manufacturer establishes IGBT module Foster ther mal network model, then using the junction temperature of Foster ther mal network model prediction IGBT module.Bibliography《Wind-powered electricity generation unsteady flow The research of power semiconductor reliability assessment and its Improving Measurements in device》Chapter 2 (http://www.doc88.com/p- 9953171100098.html)。
Further, it is upward by the previous controlling cycle bridge arm voltage and the quotient of submodule rated voltage in the step 2 Rounding obtains n1；It rounds up to obtain n by the quotient of the current time bridge arm voltage and submodule rated voltage2, wherein previous control The bridge arm voltage at period and current time is obtained by actual measurement.
Further, T0The power fail circulating cycle issue and T of the submodule obtained by emulation experiment are set as with λ0, λ pass It is the corresponding T of power fail circulating cycle issue maximum value of submodule in figure0And λ value.
Further, the T0=85 DEG C, λ=1.
Advantageous effect：
The present invention calculates all submodules in a controlling cycle first by being optimized to traditional pressure equalizing control method Then the temperature and voltage of block consider the influence of temperature in pressure equalizing, control the raising of the temperature of IGBT module, improve The service life of device so as to enhance the reliability of MMC converter valves, improves the working performance of MMC converter valves on the whole. It has the following advantages：
1) IGBT model running maximum temperatures can be reduced, improve IGBT module service life；
2) MMC converter valve failure rates can be reduced, improve system power supply efficiency；
3) service life of equipment can be extended, improve system power supply reliability.
Description of the drawings
Fig. 1 is the main circuit topological structure figure of MMC converter valves.
Fig. 2 is IGBT module junction temperature model.
Fig. 3 is improved Pressure and Control flow chart.
Fig. 4 is the relational graph of weight coefficient λ and submodule deblocking temperature.
Fig. 5 is reference temperature T0With the relational graph of submodule deblocking temperature.
Fig. 6 is the power fail circulating cycle issue and T of submodule0, λ relational graph.
Fig. 7 is submodule voltage equalizing figure；Fig. 7 (a) and 7 (b) are respectively traditional pressure equalizing control method and the method for the present invention Bridge arm submodule voltage change figure in lower A phases.
Fig. 8 is bridge arm submodule temperature variation in A phases；Fig. 8 (a) and 8 (b) are respectively traditional pressure equalizing control method and this Bridge arm submodule temperature variation in A phases under inventive method；
Fig. 9 is exchange side output voltage figure
Specific embodiment
Fig. 1 is the main circuit topological structure figure of MMC converter valves.The MMC converter valves are made of six bridge arms, each bridge arm by The identical submodule composition of N number of structure, each submodule is a half-bridge structure, by two IGBT modules and a storage capacitor Composition.Fig. 2 is IGBT module junction temperature model.Bibliography《In wind electric converter power semiconductor reliability assessment and its The research of Improving Measurements》Chapter 2, content, the device handbook provided according to device production manufacturer establish the Fox of IGBT module The junction temperature of 2 IGBT modules in submodule is obtained in special ther mal network model respectively, takes the temperature T that higher temperature value is submodule.
Fig. 3 is improved Pressure and Control flow chart.To each bridge arm, Pressure and Control are carried out using following steps：
Step 1：Two IGBT modules are obtained in the bridge arm in each submodule in the junction temperature of previous controlling cycle, take two Higher value in junction temperature as corresponding submodule previous controlling cycle temperature；Use TjRepresent previous j-th of son of controlling cycle The temperature of module, j=1,2 ..., N；
Step 2：By each submodule deblocking temperature T of previous controlling cycle1~TNRespectively with reference temperature T0Compare, temperature is more than T0Submodule be denoted as SM1~SMm, m are more than T for temperature0Submodule number；T0Value as the submodule obtained by emulation experiment The power fail circulating cycle issue and T of block0, λ relational graph obtain；
If SM1It is m in the submodule number that previous controlling cycle is excision state in~SMm1It is a, it is remaining for input shape The submodule of state；Change the switching state of this m submodule at current time, i.e., previous controlling cycle is the submodule of excision state Block becomes input state at current time, and previous controlling cycle becomes cutting off shape at current time for the submodule of input state State；Use n1And n2Previous controlling cycle and the submodule number that current time bridge arm needs are put into are represented respectively, then are also needed additional The submodule number of input is Δ n=n2-n1+m-2·m1；n1By the previous controlling cycle bridge arm voltage and the specified electricity of submodule The quotient of pressure rounds up to obtain；n2It rounds up to obtain with the quotient of submodule rated voltage by the current time bridge arm voltage, In the bridge arm voltage at previous controlling cycle and current time obtained by actual measurement；
Step 3：SM is removed in the bridge arm1~SMmSubmodule in addition is denoted as SMm+1~SMN；Introduce submodule evaluation index Mj, computational submodule SMm+1~SMNCorresponding MjValue：
Mj=Uj+λ·Tj
Wherein, MjRepresent submodule SMjCorresponding evaluation index value, UjRepresent previous controlling cycle submodule SMjElectricity Pressure, j=m+1,2 ..., N, UjIt is obtained by measuring；λ is the weight coefficient of submodule deblocking temperature, and the value of λ is obtained by emulation experiment Submodule power fail circulating cycle issue and T0, λ relational graph obtain；
Step 4：With reference to the previous controlling cycle bridge arm current and the corresponding M of submodulejValue selects current time to need to throw The n submodule of Δ for entering or cutting off：
Situation 1：The previous controlling cycle bridge arm current is timing, according to the submodule of pressure equilibrium principle selection switching：
1. if Δ n >=0, puts into the M of submodulejBe worth it is the smaller the better, therefore by SMm+1~SMNIn previous controlling cycle to cut Except the submodule of state presses its MjValue size is ranked up, and puts into wherein MjIt is worth minimum n submodule of Δ, remaining N-m- Δ n A submodule switching state is remained unchanged relative to previous controlling cycle；
If 2. Δ n<0, it is desirable to reduce the submodule number of input, by SMm+1~SMNIn previous controlling cycle for input shape The submodule of state presses MjValue size is ranked up, and cuts off wherein MjValue maximum | Δ n | a submodule, remaining N-m- | Δ n | it is a Submodule switching state is remained unchanged relative to previous controlling cycle；
Situation 2：When the previous controlling cycle bridge arm current is negative, according to the submodule for flattening weighing apparatus control principle selection switching Block：
1. if Δ n >=0, puts into the M of submodulejValue is the bigger the better, therefore by SMm+1~SMNIn previous controlling cycle to cut Except the submodule of state presses MjValue size is ranked up, and puts into wherein MjIt is worth maximum n submodule of Δ, remaining N-m- Δ n Submodule switching state is remained unchanged relative to previous controlling cycle；
If 2. Δ n<0, it is desirable to reduce the submodule of input, by SMm+1~SMNIn previous controlling cycle for input state Submodule presses MjValue size is ranked up, and cuts off wherein MjValue minimum | Δ n | a submodule, remaining N-m- | Δ n | a submodule Block switching state is remained unchanged relative to previous controlling cycle.
It is 9, MMC converter valve DC side rated voltages U to set submodule number NdcFor ± 9kV, bridge arm inductance is 2mL, sub Module rated capacity voltage U0For 2kV, submodule capacitance C is 20mF, and IGBT module uses Infineon-FZ1200R45HL3, Environment temperature TaIt is 50 DEG C, carries out emulation experiment.By taking bridge arm in A phases as an example, it is as follows to obtain simulation result：
Fig. 4 is the relational graph of weight coefficient λ and submodule deblocking temperature that emulation experiment obtains.When weight coefficient lambda gradually increases When, the temperature fluctuation of submodule also reduces therewith with temperature maximum, when λ is reduced to 1.1, the temperature fluctuation of submodule and Temperature maximum tends to saturation.
Fig. 5 is the reference temperature T that emulation experiment obtains0With the relational graph of submodule deblocking temperature, work as T0<At 60 DEG C, temperature fluctuation Very little causes switching frequency very big, and a large amount of switching losses generated therewith cause temperature amplitude significantly to rise；Work as T0>60℃ When, temperature fluctuation and maximum temperature are with T0Increase and reduce, in T0At about 80 DEG C, both tend to saturation.
Fig. 6 is the power fail circulating cycle issue and T for the submodule that emulation experiment obtains0, λ relational graph.Analysis it is found that T0=85 DEG C, during λ=1, the power fail circulating cycle issue highest of submodule, you can by property highest.Therefore, MMC converter valves are imitated T is taken in very0=85 DEG C, λ=1 is analyzed.
Fig. 7 is the submodule voltage equalizing figure that emulation experiment obtains.Analysis is it is found that of the invention than traditional pressure equalizing control method Voltage equalizing it is slightly worse.
Fig. 8 is bridge arm submodule temperature variation in A phases that emulation experiment obtains.As can be seen from the figure tradition is voltage-controlled Submodule deblocking temperature under system reaches 135 DEG C, and during pressure equalizing control method using the present invention, the temperature of submodule significantly obtains very Good control, highest amplitude are 62 DEG C；It, can although illustrating that the present invention is more slightly worse than the voltage equalizing of traditional pressure equalizing control method The service life of IGBT module is substantially increased, while improves converter valve reliability.
Fig. 9 is the exchange side output voltage figure that emulation experiment obtains.MMC converter valves are nearest using 10 level in the present embodiment Level approach method is analyzed, and the percent harmonic distortion (THD) of output voltage is 7.94%.Hundred are generally required into Practical Project Thousands of a submodules, for example, DC voltage is ± 800kV, submodule rated voltage is 3kV, at this time per mutually upper (lower) bridge arm 534 submodules are needed, i.e. output voltage is 535 level, and by using the method for the present invention, the THD of output voltage can be far below 7.94%, meet the power quality standard of national regulation.

Claims (5)

1. a kind of MMC converter valves pressure equalizing control method based on temperature, the MMC converter valves are made of six bridge arms, each bridge arm Including the identical submodule of N number of structure and a bridge arm inductance, each submodule is a half-bridge structure, including two IGBT moulds Block and a storage capacitor；
It is characterized in that, the method is, to each bridge arm, Pressure and Control are carried out using following steps：
Step 1：Two IGBT modules are obtained in the bridge arm in each submodule in the junction temperature of previous controlling cycle, take two junction temperatures In higher value as corresponding submodule previous controlling cycle temperature；Use TjRepresent previous j-th of submodule of controlling cycle Temperature, j=1,2 ..., N；
Step 2：By each submodule deblocking temperature T of previous controlling cycle1~TNRespectively with reference temperature T0Compare, temperature is more than T0Son Module is denoted as SM1~SMm, m are more than T for temperature0Submodule number；T0For empirical parameter；
If SM1It is m in the submodule number that previous controlling cycle is excision state in~SMm1A, remaining is input state Submodule；Change the switching state of this m submodule at current time；Use n1And n2Previous controlling cycle and current is represented respectively The submodule number that moment bridge arm needs are put into, then it is Δ n=n also to need the submodule number additionally put into2-n1+m-2·m1；
Step 3：SM is removed in the bridge arm1~SMmSubmodule in addition is denoted as SMm+1~SMN；Introduce submodule evaluation index Mj, calculate Submodule SMm+1~SMNCorresponding MjValue：
Mj=Uj+λ·Tj
Wherein, MjRepresent submodule SMjCorresponding evaluation index value, UjRepresent previous controlling cycle submodule SMjVoltage, j=m + 1,2 ..., N, UjIt is obtained by measuring；λ is the weight coefficient of submodule deblocking temperature, is empirical parameter；
Step 4：With reference to the previous controlling cycle bridge arm current and the corresponding M of submodulejValue, select current time need put into or N submodule of Δ of excision：
Situation 1：The previous controlling cycle bridge arm current is timing, according to the submodule of pressure equilibrium principle selection switching：
1. if Δ n >=0, puts into the M of submodulejBe worth it is the smaller the better, therefore by SMm+1~SMNIn previous controlling cycle for excision shape The submodule of state presses its MjValue size is ranked up, and puts into wherein MjIt is worth minimum n submodule of Δ, n son of remaining N-m- Δ Module switching state is remained unchanged relative to previous controlling cycle；
If 2. Δ n<0, it is desirable to reduce the submodule number of input, by SMm+1~SMNIn previous controlling cycle be input state son Module presses MjValue size is ranked up, and cuts off wherein MjValue maximum | Δ n | a submodule, remaining N-m- | Δ n | a submodule Switching state is remained unchanged relative to previous controlling cycle；
Situation 2：When the previous controlling cycle bridge arm current is negative, according to the submodule for flattening weighing apparatus control principle selection switching：
1. if Δ n >=0, puts into the M of submodulejValue is the bigger the better, therefore by SMm+1~SMNIn previous controlling cycle for excision shape The submodule of state presses MjValue size is ranked up, and puts into wherein MjIt is worth maximum n submodule of Δ, remaining n submodule of N-m- Δs Block switching state is remained unchanged relative to previous controlling cycle；
If 2. Δ n<0, it is desirable to reduce the submodule of input, by SMm+1~SMNIn previous controlling cycle be input state submodule By MjValue size is ranked up, and cuts off wherein MjValue minimum | Δ n | a submodule, remaining N-m- | Δ n | a submodule switching State is remained unchanged relative to previous controlling cycle.
2. the MMC converter valves pressure equalizing control method based on temperature according to claims 1, which is characterized in that the step In rapid 1, the device handbook provided first according to device production manufacturer establishes the Foster ther mal network model of IGBT module, then adopts With the junction temperature of Foster ther mal network model prediction IGBT module.
3. the MMC converter valves pressure equalizing control method based on temperature according to claims 1, which is characterized in that the step In rapid 2, round up to obtain n by the quotient of the previous controlling cycle bridge arm voltage and submodule rated voltage1；It should by current time Bridge arm voltage and the quotient of submodule rated voltage round up to obtain n2, wherein the bridge arm at previous controlling cycle and current time is electric Pressure is obtained by actual measurement.
4. the MMC converter valves pressure equalizing control method based on temperature according to claims 1, which is characterized in that T0It is set with λ It is set to the power fail circulating cycle issue and T of the submodule obtained by emulation experiment0, λ relational graph in, the power fail of submodule The corresponding T of circulating cycle issue maximum value0And λ value.
5. the MMC converter valves pressure equalizing control method based on temperature according to claims 1, which is characterized in that the T0= 85 DEG C, λ=1.
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Cited By (5)

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Publication number Priority date Publication date Assignee Title
CN109742961A (en) * 2018-11-30 2019-05-10 沈阳工业大学 A kind of heat balance control method of modularization multi-level converter
CN110365234A (en) * 2019-06-20 2019-10-22 中电普瑞电力工程有限公司 A kind of modular multilevel converter valve submodule operation/cutting method and device
CN110749797A (en) * 2019-11-29 2020-02-04 中国南方电网有限责任公司超高压输电公司 Method for judging abnormity of converter valve power module through capacitance state
CN111917316A (en) * 2020-06-04 2020-11-10 东南大学 Submodule temperature adjusting and balancing method based on centralized control of modular multilevel converter
CN112152495A (en) * 2019-06-28 2020-12-29 新疆金风科技股份有限公司 Control method and controller of modular multilevel converter

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CN103633870A (en) * 2013-11-19 2014-03-12 国家电网公司 Sub module capacitance and voltage balancing and optimizing method for modularized multi-level converter
CN104967292A (en) * 2015-06-29 2015-10-07 国网智能电网研究院 Active uniform pressure control method for IGBT series connection valve segment
CN105375801A (en) * 2015-10-30 2016-03-02 南方电网科学研究院有限责任公司 Modular multilevel converter voltage-sharing control method

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CN103633870A (en) * 2013-11-19 2014-03-12 国家电网公司 Sub module capacitance and voltage balancing and optimizing method for modularized multi-level converter
CN104967292A (en) * 2015-06-29 2015-10-07 国网智能电网研究院 Active uniform pressure control method for IGBT series connection valve segment
CN105375801A (en) * 2015-10-30 2016-03-02 南方电网科学研究院有限责任公司 Modular multilevel converter voltage-sharing control method

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109742961A (en) * 2018-11-30 2019-05-10 沈阳工业大学 A kind of heat balance control method of modularization multi-level converter
CN110365234A (en) * 2019-06-20 2019-10-22 中电普瑞电力工程有限公司 A kind of modular multilevel converter valve submodule operation/cutting method and device
CN112152495A (en) * 2019-06-28 2020-12-29 新疆金风科技股份有限公司 Control method and controller of modular multilevel converter
CN112152495B (en) * 2019-06-28 2023-03-31 新疆金风科技股份有限公司 Control method and controller of modular multilevel converter
CN110749797A (en) * 2019-11-29 2020-02-04 中国南方电网有限责任公司超高压输电公司 Method for judging abnormity of converter valve power module through capacitance state
CN110749797B (en) * 2019-11-29 2021-08-20 中国南方电网有限责任公司超高压输电公司 Method for judging abnormity of converter valve power module through capacitance state
CN111917316A (en) * 2020-06-04 2020-11-10 东南大学 Submodule temperature adjusting and balancing method based on centralized control of modular multilevel converter

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