CN103312208A - Zero-error recent level modulating method of modularized multi-level current converter - Google Patents
Zero-error recent level modulating method of modularized multi-level current converter Download PDFInfo
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- CN103312208A CN103312208A CN2013101651467A CN201310165146A CN103312208A CN 103312208 A CN103312208 A CN 103312208A CN 2013101651467 A CN2013101651467 A CN 2013101651467A CN 201310165146 A CN201310165146 A CN 201310165146A CN 103312208 A CN103312208 A CN 103312208A
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Abstract
The invention discloses a zero-error recent level modulating method of a modularized multi-level current converter, which can realize the tracking on the reference value of bridge arm voltage with zero error according to actual bridge arm voltage. The method comprises the following steps of measuring the capacitance and voltage of bridge arm submodules and calculating the average value of the capacitance and voltage, then dividing the average value of capacitance and voltage of the submodules with the reference value of the bridge arm voltage to obtain the number of the submodules needed to be added, subtracting the average value of capacitance and voltage of the submodules from the reference value of the bridge arm voltage, carrying out signal processing link to the difference to obtain the number of additional submodules, superposing the number of the submodules needed to be added with the number of the additional submodules, rounding a function to obtain the number of actually added submodules, and finally controlling the addition and cut-off of the bridge arm submodules through the voltage-sharing control link with the number of the actually added submodules. With the zero-error recent level modulating method, the error between the actual bridge arm voltage and the bridge arm voltage reference value can be eliminated, and double power frequency component in circulation caused by the errors can be inhibited.
Description
Technical field
The present invention relates to power electronic technology and direct current transportation field, relate in particular to a kind of nearest level modulation method of zero error of modularization multi-level converter.
Technical background
Modularization multi-level converter (Modular Multilevel Converter, MMC) is a kind of voltage with multiple levels source converter of novelty, and it is comprised of a large amount of submodules (Sub-module, SM) cascade.By input and the excision of control submodule, produce direct voltage in DC side, produce staircase waveform at AC and approach sine wave.Modularization multi-level converter is very suitable for the high-voltage dc transmission electrical domain.
Three-phase modular multilevel inverter is comprised of three-phase six brachium pontis, and each brachium pontis is comprised of a brachium pontis reactance and several submodule cascades.Because the submodule number of modularization multi-level converter brachium pontis is a lot, so adopt the staircase waveform modulation just can produce the very little sine wave of harmonic content at AC, greatly reduce switching frequency and the switching loss of modularization multi-level converter.Recently level modulation is the simplest a kind of, staircase waveform modulator approach that the engineering application is the strongest.But conventional nearest level modulation method is not considered the fluctuation of capacitance voltage, adopt the reference value of capacitance voltage to calculate the submodule number that needs input, caused between brachium pontis virtual voltage and the bridge arm voltage reference value and had certain error, these errors have caused having two times of power frequency fluctuation amounts in the circulation, have increased effective value and the loss of brachium pontis electric current.
Summary of the invention
Purpose of the present invention is intended to for the deficiencies in the prior art, has proposed a kind of nearest level modulation method of zero error of modularization multi-level converter, and it comprises the steps:
Each sampling period measures brachium pontis submodule capacitance voltage and calculates its mean value U
C, use again the bridge arm voltage reference value
Mean value U divided by the submodule capacitance voltage
CNeeding to obtain the submodule number of input, with the reference value of submodule capacitance voltage
Deduct the mean value U of submodule capacitance voltage
CAnd its difference obtained additional submodule number by signal processing links (proportional component or proportional integral link), the submodule number that will drop into again and additional submodule number stack up and obtain the submodule number of actual input by the round function, obtain input and the excision that trigger impulse removes to control the brachium pontis submodule with the actual submodule number that drops into by the Pressure and Control link at last.
The Pressure and Control link comprises the steps: that at first obtaining the submodule that actual needs drops into by controller counts N
Arm, measure brachium pontis current value i, measure again all submodule capacitance voltage values of each brachium pontis, and according to the from small to large ordering of its value, set the upper limit of the departure of maximum voltage and minimum voltage
When the departure of maximum voltage and minimum voltage greater than
The time, judge the brachium pontis current i, when i＞0, drop into minimum N
ArmIndividual submodule drops into maximum N when i≤0
ArmIndividual submodule; When the departure of maximum voltage and minimum voltage less than or equal to
The time, obtain the submodule number that drops in the upper control cycle by controller
And calculate this in cycle and need the extra submodule number that drops into
And respectively current submodule with excision that dropped into is sorted separately, judge that the submodule of brachium pontis current i and extra input is counted Δ N, when Δ N＞0, a Δ N submodule of the minimum that is in the excision state is dropped into, when Δ N＞0 in i＞0 o'clock, i≤0 o'clock, input is in a Δ N submodule of the maximum of excision state, when Δ N＜0, and i＞0 o'clock, excision is in a Δ N submodule of the maximum of input state, when Δ N＜0, i≤0 o'clock, excision is in a Δ N submodule of the minimum of input state.
Beneficial effect of the present invention: the present invention can effectively eliminate the error between brachium pontis virtual voltage and its reference value, and eliminates because the brachium pontis circulation that this error causes.
Description of drawings
Fig. 1 is the structural representation of modularization multi-level converter.
Fig. 2 is the structural representation of submodule.
Fig. 3 is the nearest level modulation method of the zero error of modularization multi-level converter control block diagram;
Fig. 4 is the nearest level modulation method of the zero error of modularization multi-level converter design sketch 1;
Fig. 5 is the nearest level modulation method of the zero error of modularization multi-level converter design sketch 2.
Embodiment
The below describes the present invention with reference to the accompanying drawings in detail, and it is more obvious that purpose of the present invention and effect will become.
Because six brachium pontis of modularization multi-level converter are just the same, take a brachium pontis as the example explanation.The nearest level modulation method of modularization multi-level converter zero error comprises the steps:
(1) measures the capacitance voltage of all submodules shown in Figure 1, and calculate the mean value U of the capacitance voltage of brachium pontis
C
(2) use the bridge arm voltage reference value
Mean value U divided by the submodule capacitance voltage
CNeeding to obtain the submodule number of input;
(3) reference value of usefulness submodule capacitance voltage
Deduct the mean value U of submodule capacitance voltage
C, and its difference obtained additional submodule number by signal processing links (proportional component or proportional integral link);
The submodule number that (4) will drop into and additional submodule number stack up and obtain the submodule number of actual input by the round function; Be limited to the total submodule of whole brachium pontis on the round function and count N, be limited to 0 down.
(5) obtain input and the excision that trigger impulse removes to control the brachium pontis submodule with the actual submodule number that drops into by the Pressure and Control link.Wherein Pressure and Control link is as follows: at first with the submodule capacitance voltage by sorting from small to large.When the brachium pontis electric current is timing, drop into the less submodule of capacitance voltage; When the brachium pontis electric current when negative, drop into the larger submodule of capacitance voltage.
The Pressure and Control link comprises the steps: that at first obtaining the submodule that actual needs drops into by controller counts N
Arm, measure brachium pontis current value i, measure again all submodule capacitance voltage values of each brachium pontis, and according to the from small to large ordering of its value, set the upper limit of the departure of maximum voltage and minimum voltage
When the departure of maximum voltage and minimum voltage greater than
The time, judge the brachium pontis current i, when i＞0, drop into minimum N
ArmIndividual submodule drops into maximum N when i≤0
ArmIndividual submodule; When the departure of maximum voltage and minimum voltage less than or equal to
The time, obtain the submodule number that drops in the upper control cycle by controller
And calculate this in cycle and need the extra submodule number that drops into
And respectively current submodule with excision that dropped into is sorted separately, judge that the submodule of brachium pontis current i and extra input is counted Δ N, when Δ N＞0, a Δ N submodule of the minimum that is in the excision state is dropped into, when Δ N＞0 in i＞0 o'clock, i≤0 o'clock, input is in a Δ N submodule of the maximum of excision state, when Δ N＜0, and i＞0 o'clock, excision is in a Δ N submodule of the maximum of input state, when Δ N＜0, i≤0 o'clock, excision is in a Δ N submodule of the minimum of input state.
The block diagram of whole step as shown in Figure 3.
Embodiment
Modularization multi-level converter is as inverter work, and dc voltage is ± 35kV, and exchanging the side line voltage effective value is 35kV, and brachium pontis submodule number is 70, and submodule rated capacity voltage is 1kV, and submodule capacitor's capacity C is 8000uF.Before 0.4s, modularization multi-level converter does not adopt method of the present invention, and 0.4s has adopted later on method of the present invention.Fig. 4 and Fig. 5 are design sketch of the present invention, Figure 4 shows that A goes up brachium pontis virtual voltage and its reference value mutually, when adopting traditional nearest level modulation method, there are certain error in brachium pontis virtual voltage and its reference value, when adopting the nearest level modulation method of zero error of the present invention, the error between brachium pontis virtual voltage and its reference value is eliminated.Figure 5 shows that A phase brachium pontis circulation, when adopting traditional nearest level modulation method, there are two times of power frequency components in circulation; , two times of power frequency components in the circulation are suppressed.
The above only is a specific embodiment of the present invention, does not consist of any limitation of the invention.All any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. the nearest level modulation method of the zero error of a modularization multi-level converter is characterized in that, it comprises the steps: to measure brachium pontis submodule capacitance voltage and calculates its mean value U
C, use again the bridge arm voltage reference value
Mean value U divided by the submodule capacitance voltage
CNeeding to obtain the submodule number of input, with the reference value of submodule capacitance voltage
Deduct the mean value U of submodule capacitance voltage
CAnd its difference obtained additional submodule number by the signal processing links, the submodule number that will drop into again and additional submodule number stack up and obtain the submodule number of actual input by the round function, obtain input and the excision that trigger impulse removes to control the brachium pontis submodule with the actual submodule number that drops into by the Pressure and Control link at last.
2. the nearest level modulation method of the zero error of described modularization multi-level converter according to claim 1 is characterized in that described signal processing links comprises proportional component or proportional integral link.
3. the nearest level modulation method of the zero error of described modularization multi-level converter according to claim 1 is characterized in that described Pressure and Control link comprises the steps: that at first obtaining the submodule that actual needs drops into by controller counts N
Arm, measure brachium pontis current value i, measure again all submodule capacitance voltage values of each brachium pontis, and according to the from small to large ordering of its value, set the upper limit of the departure of maximum voltage and minimum voltage
When the departure of maximum voltage and minimum voltage greater than
The time, judge the brachium pontis current i, when i＞0, drop into minimum N
ArmIndividual submodule drops into maximum N when i≤0
ArmIndividual submodule; When the departure of maximum voltage and minimum voltage less than or equal to
The time, obtain the submodule number that drops in the upper control cycle by controller
And calculate this cycle and need to count Δ N by the extra submodule that drops into,
And respectively current submodule with excision that dropped into is sorted separately, judge that the submodule of brachium pontis current i and extra input is counted Δ N, when Δ N＞0, a Δ N submodule of the minimum that is in the excision state is dropped into, when Δ N＞0 in i＞0 o'clock, i≤0 o'clock, input is in a Δ N submodule of the maximum of excision state, when Δ N＜0, and i＞0 o'clock, excision is in a Δ N submodule of the maximum of input state, when Δ N＜0, i≤0 o'clock, excision is in a Δ N submodule of the minimum of input state.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104393745A (en) * | 2014-11-24 | 2015-03-04 | 中国南方电网有限责任公司电网技术研究中心 | MMC (modular multilevel converter) harmonic circulating current restraining and direct-current power fluctuation restraining method |
| CN105978360A (en) * | 2016-06-16 | 2016-09-28 | 中国能源建设集团广东省电力设计研究院有限公司 | Capacitor voltage balancing method of modular multilevel converter |
| CN106787883A (en) * | 2017-01-24 | 2017-05-31 | 特变电工新疆新能源股份有限公司 | The pressure modulator approach approached based on nearest level and press modulating device |
| CN106786726A (en) * | 2017-02-17 | 2017-05-31 | 中国南方电网有限责任公司超高压输电公司 | A kind of modulation error compensation method of the modularization multi-level converter for direct current transportation |
| CN106849201A (en) * | 2015-12-04 | 2017-06-13 | 南京南瑞继保电气有限公司 | A kind of STATCOM systems charge control method |
| CN107317497A (en) * | 2017-06-26 | 2017-11-03 | 西安交通大学 | Improve the modulator approach of bridge-type Modular multilevel converter output level number |
| CN107508478A (en) * | 2017-07-20 | 2017-12-22 | 阳光电源股份有限公司 | For eliminating the method, apparatus, system and storage medium of burst pulse |
| CN108683324A (en) * | 2018-05-24 | 2018-10-19 | 武汉大学 | The quick pressure equalizing control method of submodule of modularization multi-level converter |
-
2013
- 2013-05-06 CN CN2013101651467A patent/CN103312208A/en active Pending
Non-Patent Citations (1)
| Title |
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| 屠卿瑞等: "一种优化的模块化多电平换流器电压均衡控制方法", 《电工技术学报》 * |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104393745A (en) * | 2014-11-24 | 2015-03-04 | 中国南方电网有限责任公司电网技术研究中心 | MMC (modular multilevel converter) harmonic circulating current restraining and direct-current power fluctuation restraining method |
| CN106849201A (en) * | 2015-12-04 | 2017-06-13 | 南京南瑞继保电气有限公司 | A kind of STATCOM systems charge control method |
| CN106849201B (en) * | 2015-12-04 | 2019-09-27 | 南京南瑞继保电气有限公司 | A kind of STATCOM system charge control method |
| CN105978360A (en) * | 2016-06-16 | 2016-09-28 | 中国能源建设集团广东省电力设计研究院有限公司 | Capacitor voltage balancing method of modular multilevel converter |
| CN105978360B (en) * | 2016-06-16 | 2018-06-19 | 中国能源建设集团广东省电力设计研究院有限公司 | A kind of modularization multi-level converter capacitor voltage equalizing method |
| CN106787883A (en) * | 2017-01-24 | 2017-05-31 | 特变电工新疆新能源股份有限公司 | The pressure modulator approach approached based on nearest level and press modulating device |
| CN106786726A (en) * | 2017-02-17 | 2017-05-31 | 中国南方电网有限责任公司超高压输电公司 | A kind of modulation error compensation method of the modularization multi-level converter for direct current transportation |
| CN106786726B (en) * | 2017-02-17 | 2019-03-05 | 中国南方电网有限责任公司超高压输电公司 | A kind of modulation error compensation method of the modularization multi-level converter for direct current transportation |
| CN107317497A (en) * | 2017-06-26 | 2017-11-03 | 西安交通大学 | Improve the modulator approach of bridge-type Modular multilevel converter output level number |
| CN107508478A (en) * | 2017-07-20 | 2017-12-22 | 阳光电源股份有限公司 | For eliminating the method, apparatus, system and storage medium of burst pulse |
| CN108683324A (en) * | 2018-05-24 | 2018-10-19 | 武汉大学 | The quick pressure equalizing control method of submodule of modularization multi-level converter |
| CN108683324B (en) * | 2018-05-24 | 2019-10-01 | 武汉大学 | The quick pressure equalizing control method of the submodule of modularization multi-level converter |
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Application publication date: 20130918 |