CN106786726A - A kind of modulation error compensation method of the modularization multi-level converter for direct current transportation - Google Patents
A kind of modulation error compensation method of the modularization multi-level converter for direct current transportation Download PDFInfo
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- 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
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- 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
- H02J3/01—Arrangements for reducing harmonics or ripples
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- 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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
- H02J3/1857—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters wherein such bridge converter is a multilevel converter
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- 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
- H02J2003/365—Reducing harmonics or oscillations in HVDC
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- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/20—Active power filtering [APF]
-
- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
-
- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
-
- 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]
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- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
A kind of modulation error compensation method of modularization multi-level converter for direct current transportation, described transverter uses modular multilevel structure, including multiple valve submodules, there is capacitor, switching tube and diode in each submodule；Described modulation rounds the method sorted with capacitance voltage using valve submodule number；The present invention will modulate Neutron module number round the error of generation, submodule capacitor voltage deviate average capacitor voltage caused by error feedback stacks to next controlling cycle instruction input submodule number in.This method will substantially reduce the error between its output voltage and modulation voltage in transverter steady-state operation, so as to reduce current harmonics, avoid concussion；The difference between capacitance voltage can also further be relaxed, switching frequency is reduced, reduce transverter loss.
Description
Technical field
The present invention relates to flexible direct current power transmission system control technology field, more particularly to a kind of module for direct current transportation
Change the modulation error compensation method of multilevel converter.
Background technology
Voltage-source type DC transmission system, also referred to as flexible direct current power transmission system, support current conversion station it is active/idle independence
Control, do not need huge alternating current filter, support power grid"black-start", support net power supply weak to island/wind power plant etc., be to solve
Regional new-energy grid-connected and the effective method of problem of dissolving.Current modular multi-level converter is to realize voltage
One of main method of source type DC transmission system, but the control protection technique of modularization multi-level converter is complicated, especially
It is the pulse modulation technique of its valve submodule.
Current modularization multi-level converter mainly has three kinds of modulation strategies.The first is carrier wave stacking modulation, due to it
Complicated capacitance voltage sort algorithm and switching frequency higher, is generally unsuitable for the extremely many flexible high pressures of valve submodule number straight
Stream field of power transmission.For second phase-shifting carrier wave modulation, its major advantage is that switching frequency is fixed, but when capacitance voltage deviation compared with
When big, balancing speed is slower；And need to design balance controller for each submodule, cause equilibrium strategy data amount of calculation
Larger and hardware is difficult to.The third is that nearest level approaches modulation, and major advantage is simple control, and hardware is easily achieved,
And as submodule number increases, output harmonic wave will be gradually reduced, switching frequency further reduces even substantially stationary, therefore turns into
The primary modulation strategy of flexible high pressure direct current transportation occasion.
Nearest level approaches modulation and generally rounds the method with capacitance voltage sequence using submodule number to realize to modulation
The tracking of voltage, and ensure capacitance voltage relative equilibrium.But there are two kinds of intrinsic errors in this modulation:Number of modules rounds generation
Error, the error between each submodule capacitor voltage and average capacitor voltage.Both errors can cause converter bridge arm defeated
Go out difference between voltage and command voltage larger, finally cause output harmonic wave, even slight concussion.On the other hand, in order to reduce
Transverter is lost, it is desirable to reduce switching frequency as far as possible, it is necessary to further relax the difference between each submodule capacitor voltage, this
More exacerbate the deviation between command voltage and actual output voltage.Therefore, in order to reduce the humorous of modularization multi-level converter
Ripple and loss are improved, it is necessary to be based on above two error and approach modulation to existing nearest level.
The content of the invention
In order to overcome the deficiencies in the prior art, the present invention to provide a kind of modularization multi-level converter for direct current transportation
Modulation error compensation method, be that can not increase switching frequency, not influence modulation voltage to track and capacitor voltage balance, and energy
The nearest level for reducing module transverter harmonic wave and loss approaches modulation error compensation method.
In order to achieve the above object, the present invention is realized using following technical scheme：
A kind of modulation error compensation method of modularization multi-level converter for direct current transportation, described transverter is adopted
Modular multilevel structure, including multiple valve submodules are used, there is capacitor, switching tube and diode in each submodule；It is described
Modulation using valve submodule number round with capacitance voltage sort method；Each bridge arm is produced in the current controller of transverter
After modulation voltage, so calculate each bridge arm instruction input valve submodule number, instruction input submodule number on superposition below
Two kinds of errors of property, can also directly be superimposed second error of property on modulation voltage：
A) instruction valve submodule number rounds caused error；
B) each submodule capacitor voltage deviates error caused by average capacitor voltage.
It is the method for putting into the error for being superimposed described two properties in submodule number is instructed：
Step one, according to each submodule capacitor voltage value of bridge arm in current control period, calculate the bridge arm average capacitance electricity
Pressure value：
Step 2, the modulation voltage U according to the current bridge armref, electric capacity rated voltage Ucap, calculate current instruction input
Submodule number：
Nref=Uref÷Ucap
Step 3, submodule number is put into according to present instruction, be superimposed the two kinds of error amounts calculated in last controlling cycle
Error1_z1 and Error2_z1, calculates currently practical input submodule number：
Non=round0.5(Nref+ Error1_z1+Error2_z1), round0.5It is rounding algorithm；
If being currently first controlling cycle, Error1_z1 and Error2_z1 are all zero；
Step 4, front and rear difference is rounded according to current sub-block number, calculate the first error amount of current period：
Error1=(Nref+Error1_z1+Error2_z1)-Non
Step 5, the capacitance voltage U according to each submodule in current bridge armcI () and switching state Pulse (i), calculating should
The currently practical output voltage of bridge arm：
U=∑s [Uc(i) × Pulse (i)]=[Uc(1)·Pulse(1)+Uc(2)·Pulse(2)+…+Uc(n)·
Pulse(n)]
Step 6, according to the currently practical output voltage of the bridge arm, current average capacitor voltage value, calculating is being ignored in bridge arm
Expectation input submodule number between each capacitance voltage during difference：
Step 7, calculate because of error caused by difference between each capacitance voltage in bridge arm, namely current period second mistake
Difference：
Error2=Non–Ne。
The method that the error of described two properties is superimposed on modulation voltage is：
Step one, according to each submodule capacitor voltage value of bridge arm in current control period, calculate the bridge arm average capacitance electricity
Pressure value：
Step 2, the modulation voltage U according to the current bridge armref, electric capacity rated voltage Ucap, calculate in last controlling cycle
Second error value E rror2_z1, calculate current instruction input submodule number：
Nref=(Uref+Error2_z1)÷Ucap
If being currently first controlling cycle, Error2_z1 is zero.
Step 3, submodule number is put into according to present instruction, be superimposed the first error amount calculated in last controlling cycle
Error1_z1, calculates currently practical input submodule number：
Non=round0.5(Nref+ Error1_z1), round0.5It is rounding algorithm；
If being currently first controlling cycle, Error1_z1 is zero；
Step 4, front and rear difference is rounded according to current sub-block number, calculate the first error amount of current period：
Error1=(Nref+Error1_z1)-Non
Step 5, the capacitance voltage U according to each submodule in current bridge armcI () and switching state Pulse (i), calculating should
The currently practical output voltage of bridge arm：
U=∑s [Uc(i) × Pulse (i)]=[Uc(1)·Pulse(1)+Uc(2)·Pulse(2)+…+Uc(n)·
Pulse(n)]
Step 6, according to the bridge arm it is currently practical input submodule number and average capacitor voltage, calculating ignoring each submodule
Desired output voltage between block capacitance voltage during difference：
Step 7, calculate because of error caused by difference between each submodule capacitor voltage, namely current period second mistake
Difference：
Error2=Ue–U。
Methods described calculates bridge arm instruction input submodule number and rounds front and rear error amount.
Error amount before and after methods described rounds bridge arm instruction input submodule number is added to instruction input submodule number
On.
Methods described calculates bridge arm desired output electricity according to the actual input submodule number of bridge arm average capacitor voltage and bridge arm
Pressure, and then calculate the error amount between bridge arm desired output voltage and actual output voltage.
Proportionally be added to error amount between bridge arm desired output voltage and bridge arm actual output voltage by methods described
In the instruction input submodule number of the bridge arm, or directly it is added on modulation voltage.
Compared with prior art, the beneficial effects of the invention are as follows：
(1) the nearest level of modularization multi-level converter that the present invention is provided approaches modulator approach, can effectively reduce and change
Stream device AC output harmonic wave, also reducing causes the possibility of concussion because of harmonic wave.
(2) the nearest level of modularization multi-level converter that the present invention is provided approaches modulator approach, can be changed not increasing
Average frequency of switching is reduced on the premise of stream device output harmonic wave, so as to reduce transverter loss.
Brief description of the drawings
Fig. 1 is modularization multi-level converter principle schematic of the invention；
Nearest level before Fig. 2 is the present invention approaches modulation block diagram；
Fig. 3 is modulation compensated algorithm block diagram proposed by the present invention；
Fig. 4 is a kind of specific calculation of error E rror1 and Error2 proposed by the present invention；
Fig. 5 is that the another of error E rror2 proposed by the present invention is calculated and cumulative mode.
Specific embodiment
The specific embodiment that the present invention is provided is described in detail below in conjunction with accompanying drawing.
Fig. 1 show a modularization multi-level converter, including 6 bridge arms, and each bridge arm is by n valve submodule and 1
Individual bridge arm reactance composition.In transverter steady-state operation, current controller is mutual for the upper and lower bridge arm of kth phase (k=a, b, c) is produced
The modulation voltage U of benefitdc/2-UkAnd Udc/2+Uk；The input for approaching modulation control bridge arm internal valve submodule by nearest level again is cut
Except state so that the output voltage (putting into submodule capacitor voltage sum) of bridge arm tracks its modulation voltage.In ideal situation
Under, Ua、Ub、UcIt is three phase sine voltage, so that transverter AC output voltage is three phase sine, DC voltage after modulating
For upper and lower bridge arm voltage and, i.e., equal to Udc。
Nearest level before Fig. 2 show the present invention approaches modulation block diagram.UrefIt is the modulation voltage of bridge arm, divided by son
Module capacitance rated voltage UcapAfterwards, instruction input submodule number N is obtainedref, the bridge arm reality is obtained by round
The submodule number N of inputon.Again by capacitor voltage balance control, the input excision state of each submodule, its output signal are determined
Pulse (i) reflects i-th input or excision situation of submodule:If i-th submodule input, Pulse (i) is 1；If
I-th submodule excision, Pulse (i) is 0.Wherein, ∑ Pulse (i)=Non, i=1,2 ..., n.
But, being approached under modulator approach in above-mentioned nearest level, modulation voltage is equal to Nref×Ucap, and bridge arm reality output
Voltage is the capacitance voltage sum for putting into submodule, i.e. ∑ [Pulse (i) × Uc(i)].Both contrasts are as can be seen that have two
Planting error can influence bridge arm output voltage to track its modulation voltage：Submodule number rounds the error of generation, submodule capacitor voltage
Deviate error caused by average capacitor voltage.In order to preferably track modulation voltage, according to the present invention, current control can be first calculated
The value of the two errors in cycle processed, then next controlling cycle that error amount is added to instruction input submodule number NrefOr
Modulation voltage UrefOn so that the input submodule number after compensation corrects the error in a cycle as much as possible.The present invention is proposed
Nearest level approach modulation block diagram it is as shown in Figure 3.Wherein, two kinds of specific calculating of error are as shown in figure 4, be described as follows：
Step one, according to each submodule capacitor voltage value of bridge arm in current control period, calculate the bridge arm average capacitance electricity
Pressure value：
Step 2, the modulation voltage U according to the current bridge armref, electric capacity rated voltage Ucap, calculate current instruction input
Submodule number：
Nref=Uref÷Ucap
Step 3, submodule number is put into according to present instruction, be superimposed the two kinds of error amounts calculated in last controlling cycle
Error1_z1 and Error2_z1, calculates currently practical input submodule number：
Non=round0.5(Nref+ Error1_z1+Error2_z1), round0.5It is rounding algorithm；
If being currently first controlling cycle, Error1_z1 and Error2_z1 are all zero；
Step 4, front and rear difference is rounded according to current sub-block number, calculate the first error amount of current period：
Error1=(Nref+Error1_z1+Error2_z1)-Non
Step 5, the capacitance voltage U according to each submodule in current bridge armcI () and switching state Pulse (i), calculating should
The currently practical output voltage of bridge arm：
U=∑s [Uc(i) × Pulse (i)]=[Uc(1)·Pulse(1)+Uc(2)·Pulse(2)+…+Uc(n)·
Pulse(n)]
Step 6, according to the currently practical output voltage of the bridge arm, current average capacitor voltage value, calculating is being ignored in bridge arm
Expectation input submodule number between each capacitance voltage during difference：
Step 7, calculate because of error caused by difference between each capacitance voltage in bridge arm, namely current period second mistake
Difference：
Error2=Non–Ne。
Another implementation method of the invention is directly added in modulation voltage second error so that after amendment
Modulation voltage correct second error in next cycle as much as possible.Now nearest level approaches the block diagram of modulator approach
As shown in figure 5, the specific calculating of wherein error is described as follows：
Step one, according to each submodule capacitor voltage value of bridge arm in current control period, calculate the bridge arm average capacitance electricity
Pressure value：
Step 2, the modulation voltage U according to the current bridge armref, electric capacity rated voltage Ucap, calculate in last controlling cycle
Second error value E rror2_z1, calculate current instruction input submodule number：
Nref=(Uref+Error2_z1)÷Ucap
If being currently first controlling cycle, Error2_z1 is zero.
Step 3, submodule number is put into according to present instruction, be superimposed the first error amount calculated in last controlling cycle
Error1_z1, calculates currently practical input submodule number：
Non=round0.5(Nref+ Error1_z1), round0.5It is rounding algorithm；
If being currently first controlling cycle, Error1_z1 is zero；
Step 4, front and rear difference is rounded according to current sub-block number, calculate the first error amount of current period：
Error1=(Nref+Error1_z1)-Non
Step 5, the capacitance voltage U according to each submodule in current bridge armcI () and switching state Pulse (i), calculating should
The currently practical output voltage of bridge arm：
U=∑s [Uc(i) × Pulse (i)]=[Uc(1)·Pulse(1)+Uc(2)·Pulse(2)+…+Uc(n)·
Pulse(n)]
Step 6, according to the bridge arm it is currently practical input submodule number and average capacitor voltage, calculating ignoring each submodule
Desired output voltage between block capacitance voltage during difference：
Step 7, calculate because of error caused by difference between each submodule capacitor voltage, namely current period second mistake
Difference：
Error2=Ue–U。
Above example is implemented under premised on technical solution of the present invention, gives detailed implementation method and tool
The operating process of body, but protection scope of the present invention is not limited to the above embodiments.Method therefor is such as without spy in above-described embodiment
Do not mentionlet alone and bright be conventional method.
Claims (5)
1. a kind of modulation error compensation method of modularization multi-level converter for direct current transportation, described transverter is used
Modular multilevel structure, including multiple valve submodules, there is capacitor, switching tube and diode in each submodule；Described
Modulate the method for being rounded using valve submodule number and being sorted with capacitance voltage；It is characterized in that：Produced in the current controller of transverter
After the modulation voltage of each bridge arm of life, and then the instruction input valve submodule number of each bridge arm is calculated, in instruction input submodule number
The error of the upper following two properties of superposition, can also directly be superimposed second error of property on modulation voltage：
A) instruction valve submodule number rounds caused error；
B) each submodule capacitor voltage deviates error caused by average capacitor voltage；
It is the method for putting into the error for being superimposed described two properties in submodule number is instructed：
Step one, according to each submodule capacitor voltage value of bridge arm in current control period, calculate the bridge arm average capacitor voltage value：
ūc=∑ Uc(i) ÷ n=[Uc(1)+Uc(2)+…+Uc(n)]÷n
Step 2, the modulation voltage U according to the current bridge armref, electric capacity rated voltage Ucap, calculate current instruction input submodule
Block number：
Nref=Uref÷Ucap
Step 3, submodule number is put into according to present instruction, be superimposed the two kinds of error value E rror1_ calculated in last controlling cycle
Z1 and Error2_z1, calculates currently practical input submodule number：
Non=round0.5(Nref+ Error1_z1+Error2_z1), round0.5It is rounding algorithm；
If being currently first controlling cycle, Error1_z1 and Error2_z1 are all zero；
Step 4, front and rear difference is rounded according to current sub-block number, calculate the first error amount of current period：
Error1=(Nref+Error1_z1+Error2_z1)-Non
Step 5, the capacitance voltage U according to each submodule in current bridge armcI () and switching state Pulse (i), calculates the bridge arm
Currently practical output voltage：
U=∑s [Uc(i) × Pulse (i)]=[Uc(1)·Pulse(1)+Uc(2)·Pulse(2)+…+Uc(n)·Pulse
(n)]
Step 6, according to the currently practical output voltage of the bridge arm, current average capacitor voltage value, each electricity in bridge arm is being ignored in calculating
Expectation input submodule number between appearance voltage during difference：
Step 7, calculate because of error caused by difference between each capacitance voltage in bridge arm, namely current period second error amount：
Error2=Non–Ne
The method that the error of described two properties is superimposed on modulation voltage is：
Step one, according to each submodule capacitor voltage value of bridge arm in current control period, calculate the bridge arm average capacitor voltage value：
Step 2, the modulation voltage U according to the current bridge armref, electric capacity rated voltage Ucap, calculate in last controlling cycle the
Two kinds of error value E rror2_z1, calculate current instruction input submodule number：
Nref=(Uref+Error2_z1)÷Ucap
If being currently first controlling cycle, Error2_z1 is zero.
Step 3, submodule number is put into according to present instruction, be superimposed the first error amount calculated in last controlling cycle
Error1_z1, calculates currently practical input submodule number：
Non=round0.5(Nref+ Error1_z1), round0.5It is rounding algorithm；
If being currently first controlling cycle, Error1_z1 is zero；
Step 4, front and rear difference is rounded according to current sub-block number, calculate the first error amount of current period：
Error1=(Nref+Error1_z1)-Non
Step 5, the capacitance voltage U according to each submodule in current bridge armcI () and switching state Pulse (i), calculates the bridge arm
Currently practical output voltage：
U=∑s [Uc(i) × Pulse (i)]=[Uc(1)·Pulse(1)+Uc(2)·Pulse(2)+…+Uc(n)·Pulse
(n)]
Step 6, according to currently practical input submodule number and the average capacitor voltage of the bridge arm, calculate and ignoring each submodule electricity
Desired output voltage between appearance voltage during difference：
Step 7, calculate because of error caused by difference between each submodule capacitor voltage, namely current period second error amount：
Error2=Ue–U。
2. the modulation error compensation side of a kind of modularization multi-level converter for direct current transportation according to claim 1
Method, it is characterised in that calculate bridge arm instruction input submodule number and round front and rear error amount.
3. the modulation error compensation side of a kind of modularization multi-level converter for direct current transportation according to claim 1
Method, it is characterised in that the error amount before and after bridge arm instruction input submodule number is rounded is added in instruction input submodule number.
4. the modulation error compensation side of a kind of modularization multi-level converter for direct current transportation according to claim 1
Method, it is characterised in that according to the actual input submodule number of bridge arm average capacitor voltage and bridge arm, calculate bridge arm desired output electricity
Pressure, and then calculate the error amount between bridge arm desired output voltage and actual output voltage.
5. the modulation error compensation side of a kind of modularization multi-level converter for direct current transportation according to claim 1
Method, it is characterised in that the error amount between bridge arm desired output voltage and bridge arm actual output voltage is proportionally added to this
In the instruction input submodule number of bridge arm, or directly it is added on modulation voltage.
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| 周洋等: "模块化多电平换流器改进最近电平调制策略", 《浙江大学学报（工学版）》 * |
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| CN108054944B (en) * | 2018-01-25 | 2019-05-07 | 湖南大学 | A kind of 50 electric harmonic generator control methods |
| CN108667062A (en) * | 2018-03-15 | 2018-10-16 | 许继集团有限公司 | A kind of electric system and its power quality adjusting device |
| CN112003489A (en) * | 2020-09-08 | 2020-11-27 | 上海电力设计院有限公司 | Level number control method of modular multilevel converter |
| CN112003489B (en) * | 2020-09-08 | 2024-05-14 | 上海电力设计院有限公司 | Level number control method of modularized multi-level converter |
| CN113364022A (en) * | 2021-05-18 | 2021-09-07 | 中国南方电网有限责任公司超高压输电公司 | Method and system for optimizing switching loss of power sub-module of flexible direct current transmission system |
| CN113364022B (en) * | 2021-05-18 | 2022-05-17 | 中国南方电网有限责任公司超高压输电公司 | Method and system for optimizing switching loss of power sub-module of flexible direct current transmission system |
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Address after: 510620 No. 116 Tianhe Road, Guangzhou, Guangdong, Tianhe District Patentee after: CSG EHV POWER TRANSMISSION Co. Patentee after: Rongxin Huike Electric Co.,Ltd. Address before: 510620 No. 116 Tianhe Road, Guangzhou, Guangdong, Tianhe District Patentee before: CSG EHV POWER TRANSMISSION Co. Patentee before: RONGXIN HUIKE ELECTRIC TECHNOLOGY Co.,Ltd. |