CN103066587A - Optimal configuration method of modular multi-level flexible direct current system - Google Patents

Optimal configuration method of modular multi-level flexible direct current system Download PDF

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Publication number
CN103066587A
CN103066587A CN2012105372815A CN201210537281A CN103066587A CN 103066587 A CN103066587 A CN 103066587A CN 2012105372815 A CN2012105372815 A CN 2012105372815A CN 201210537281 A CN201210537281 A CN 201210537281A CN 103066587 A CN103066587 A CN 103066587A
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China
Prior art keywords
converter
configuration method
optimal configuration
negative pole
submodule
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CN2012105372815A
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CN103066587B (en
Inventor
杨杰
贺之渊
林畅
孔明
阎发友
何维国
刘隽
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Global Energy Interconnection Research Institute
State Grid Shanghai Municipal Electric Power Co
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State Grid Corp of China SGCC
Shanghai Municipal Electric Power Co
China EPRI Electric Power Engineering Co Ltd
Smart Grid Research Institute of SGCC
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M7/00Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483Converters with outputs that each can have more than two voltages levels
    • H02M7/4835Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/0095Hybrid converter topologies, e.g. NPC mixed with flying capacitor, thyristor converter mixed with MMC or charge pump mixed with buck

Abstract

The invention provides an optimal configuration method of a modular multi-level flexible direct current system. The method comprises the following steps of (1) configuring a converter in a double-pole topological structure, (2) configuring a capacitance energy balance current access according to the converter in the double-pole topological structure, and (3) computing an output voltage set value of a sub-module. Through the access, the sub-module is controlled according to the output voltage set value, and capacitance energy balance can be achieved. According to the optimal configuration method of the modular multi-level flexible direct current system, using number of elements is small, cost is low, a high-voltage high-capacity overhead line transmission structure is easy to realize, and a balance strategy can effectively achieve capacitance energy balance.

Description

The Optimal Configuration Method of a kind of modular multilevel flexible direct current system
Technical field
The invention belongs to the Technology of HVDC based Voltage Source Converter field, be specifically related to the Optimal Configuration Method of a kind of modular multilevel flexible direct current system.
Background technology
The flexible DC power transmission system is based on the DC transmission system of the voltage-source type converter take full-control type device (IGBT) as core, its superior performance, application scalability is good, have broad application prospects in a plurality of fields such as wind-powered electricity generation access, Power System Interconnection, urban electricity supply and isolated island power supplies, in recent years, the development of modular multilevel Technology of HVDC based Voltage Source Converter is very rapid.
The converter of flexible DC power transmission system is its core parts, be used for realizing the conversion of alterating and direct current tolerance, the development of high pressure flexible direct current converter is from original two level topology, three level topology, change gradually present modular multilevel topology into, it is comprised of 6 brachium pontis, and two brachium pontis are an individual event convertor unit up and down.Each brachium pontis is by a plurality of submodule (Submodule, SM) be in series, submodule is by two (or four) IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) and half-bridge (or full-bridge) structure that forms of capacitor, as depicted in figs. 1 and 2.Its operation principle is turning on and off by the IGBT device, electric capacity is dropped into circuit or withdraws from circuit, reasonably control the input of a plurality of submodules and withdraw from, just can form stable voltage in the alternating current-direct current side, thereby form stable system works point and carry out power delivery, as shown in Figure 2.
Yet, existing modular multilevel technology adopts a plurality of submodule stacks, need a large amount of electric capacity and IGBT device, if employing full-bridge topology, the number of devices that needs is more, price is very expensive, adopts novel topology reducing system cost, and system is generalized to overhead wire from cable application uses and become very important research direction.
The proposition of novel topological structure provides brand-new method for flexible direct current to the development of high-voltage large-capacity overhead wire field.The New Topological price is relatively low, and loss is little, can realize large capacitance grade application, has broad application prospects.
In the prior art, its topological structure mainly contains three basic structures, structure one can realize power delivery in the situation that use less submodule for adopting the form of full-bridge submodule cascade and the combination of IGBT guide switch, can realize the alternating current-direct current fault traversing simultaneously; Structure two adopts single-phase full bridge structure and the series-parallel form of half-bridge submodule cascade structure, realize power delivery, but structure two is difficult to realize that DC Line Fault passes through, and AC fault also needs to realize by the control of complexity; The structure three that article proposes, namely as shown in Figure 4 and Figure 5 the topological structure of narration can be realized power delivery by series connection or mode in parallel, owing to adopting the full-bridge cascade, the alternating current-direct current fault traversing is realized simple simultaneously.
For the structure of said structure two, the topological structure of its differentiation is difficult to realize that DC Line Fault passes through.
Summary of the invention
For the deficiencies in the prior art, the invention provides the Optimal Configuration Method of a kind of modular multilevel flexible direct current system, realize the capacitive energy balance.
The Optimal Configuration Method of a kind of modular multilevel flexible direct current provided by the invention system, its improvements be, described method comprises the steps:
(1) converter of configuration bipolar topology;
(2) according to the path of the converter of bipolar topology configuration capacitive energy balanced balanced current;
(3) the output voltage set point of calculating sub module by described path, according to output voltage set point control submodule, is used for realizing the capacitive energy balance.
Wherein, the converter of the described configuration bipolar topology of step (1) is that negative pole and the positive pole by the converter of two tandem type topological structures is connected in same earth point, and positive pole in addition is connected transmission line with negative pole, consists of the converter of bipolar topology, or
Negative pole and the positive pole of the converter by two parallel connection type topological structures are connected in same earth point, and positive pole in addition is connected transmission line with negative pole, consist of the converter of bipolar topology.
Wherein, the converter of described tandem type topological structure be adopt that the A phase negative pole of single-phase convertor unit and B anodally mutually connect, B phase negative pole and C anodal connection mutually, A mutually anodal and C mutually negative pole respectively as the connection type of the both positive and negative polarity of DC line.
Wherein, the converter of described parallel connection type topological structure is that employing A, B, C three-phase positive pole are anodal as DC line after connecting, A, B, the rear connection type as the DC line negative pole of C three-phase negative pole connection.
Wherein, consist of if the converter of described bipolar topology is converter by two tandem type topological structures, filter I then is set between positive pole and earth electrode, filter I is set between negative pole and earth electrode;
Described filter I is made of the submodule of series connection; Described submodule comprises electric capacity in parallel and the IGBT module of half-bridge structure.
Wherein, consist of if the converter of described bipolar topology is converter by two parallel connection type topological structures, then the dc output end at the converter of described bipolar topology is provided with filter I;
Described filter I is made of the submodule of series connection; Described submodule comprises electric capacity in parallel and the IGBT module of half-bridge structure.
Wherein, the method for the path of the described converter configuration capacitive energy balanced balanced current according to bipolar topology of step (2) comprises:
AC at the converter of bipolar topology arranges filter II.
Wherein, the method for the path of the described converter configuration capacitive energy balanced balanced current according to bipolar topology of step (2) comprises:
Increase an individual event three-winding transformer, the transformer of the corresponding AC network of its three windings; Described three windings adopt the heart-shaped mode that connects, and are provided with electric capacity and resistance between any two windings.
Wherein, the step of the output voltage set point of the described calculating sub module of step (3) comprises:
1) according to the actual submodule energy of three-phase with set the poor of energy, obtains Injection Current amplitude set point through controlling unit;
2) obtain the set point that triple-frequency harmonics injects according to current amplitude set point and phase settings;
3) triple-frequency harmonics set point and actual value are compared, through described controlling unit, obtain the output voltage set point of cascade submodule.
Wherein, when ageing loss appears in the capacity of the converter of bipolar topology, regulate the output voltage of filter I, it is carried out corresponding compensation.
Compared with the prior art, beneficial effect of the present invention is:
1, the present invention uses component number few, and low price is easy to realize high-voltage large-capacity overhead wire transmission structure;
2, the equilibrium strategy of the present invention's proposition can effectively realize the capacitive energy balance;
But 3, transformer connection form of the present invention and related pathways design effective supply capacitive energy balanced balanced current path;
4, both flexible filtering harmonic wave of filter configuration scheme of the present invention also can the blocking capacitor discharging current, and can compensate the appearance value loss that long-term ageing causes;
5, two kinds of the present invention's proposition topologys that can realize three-phase structure by the phase structure combination, can effectively realize the alternating current-direct current fault traversing, simultaneously, the topology that proposes or transformer configuration method can effectively realize the system voltage balance policy, a kind of optional design of filter scheme that proposes simultaneously can effectively realize active power filtering, blocking-up fault current, can also compensate simultaneously because the appearance value loss that component ageing causes.
Description of drawings
Fig. 1 is the sub modular structure schematic diagram of half-bridge structure provided by the invention.
Fig. 2 is the sub modular structure schematic diagram of full bridge structure provided by the invention.
Fig. 3 is the single-phase working mechanism schematic diagram of submodule provided by the invention.
Fig. 4 is the topological structure schematic diagram one of converter connecting system provided by the invention.
Fig. 5 is the topological structure schematic diagram two of converter connecting system provided by the invention.
Fig. 6 is bipolar topology schematic diagram provided by the invention.
Fig. 7 is filter via configuration method provided by the invention.
Fig. 8 is the collocation method of transformer provided by the invention.
Fig. 9 is the mode that filter provided by the invention adopts submodule to realize.
Figure 10 is the flow chart of Optimal Configuration Method provided by the invention.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
The Optimal Configuration Method of a kind of modular multilevel flexible direct current system that the present embodiment provides, its flow chart specifically comprises the steps: as shown in figure 10
(1) converter of configuration bipolar topology, its structure chart is as shown in Figure 6;
The converter of described configuration bipolar topology is to be connected in same earth point by the negative pole of the converter of two tandem type topological structures and positive pole, and in addition positive pole and negative pole are connected in transmission line, consists of the converter of bipolar topology, or
Negative pole and the positive pole of the converter by two parallel connection type topological structures are connected in same earth point, and in addition positive pole and negative pole are connected in transmission line, consist of the converter of bipolar topology.
Consist of if the converter of described bipolar topology is the converter by two tandem type topological structures, filter I then is set between positive pole and earth electrode, filter I is set between negative pole and earth electrode; Consist of if the converter of described bipolar topology is the converter by two parallel connection type topological structures, then the dc output end at the converter of described bipolar topology is provided with filter I;
Described filter I is used for the filtering harmonic wave, is made of the submodule of connecting; Described submodule comprises electric capacity in parallel and the IGBT module of half-bridge structure, as shown in Figure 9.Wherein, the converter of described tandem type topological structure be adopt that the A phase negative pole of single-phase convertor unit and B anodally mutually connect, B phase negative pole and C anodal connection mutually, A mutually anodal and C mutually negative pole respectively as the connection type of the both positive and negative polarity of DC line.The converter of parallel connection type topological structure is that employing A, B, C three-phase positive pole are anodal as DC line after connecting, A, B, the rear connection type as the DC line negative pole of C three-phase negative pole connection.
(2) according to the path of the converter of bipolar topology configuration capacitive energy balanced balanced current, it is realized by dual mode;
1. the AC at the converter of bipolar topology arranges filter, as shown in Figure 7 (this figure only draws half of dipolar configuration, and part is the same therewith with structure for its second half principle).This filter is triple frequency harmonic filter
2. change the mode of connection of transformer, as shown in Figure 8, increase an individual event three-winding transformer, the transformer in the corresponding AC network of its three windings; Described three windings adopt the heart-shaped mode that connects, and are provided with the mode that electric capacity and resistance (shown in 10 among the figure) its electric capacity and resistance are taked serial or parallel connection between any two windings, and its value requires to set according to the phase place of injecting triple-frequency harmonics.
(3) the output voltage set point of calculating sub module by described path, according to output voltage set point control submodule, is used for realizing the capacitive energy balance.
The step of the output voltage set point of calculating sub module comprises:
1) according to the actual submodule energy of three-phase with set the poor of energy, obtains Injection Current amplitude set point through controlling unit (such as the proportional integral link, two feedback elements);
2) obtain the set point that triple-frequency harmonics injects according to current amplitude set point and phase settings;
3) triple-frequency harmonics set point and actual value are compared, through described controlling unit, obtain the output voltage set point of cascade submodule.
A kind of alternative scheme of aforesaid way is triple-frequency harmonics to be set with the fundamental component setting superpose as overall input, concentrates and carries out the Current Control tracking;
When ageing loss appears in the capacity of the converter of bipolar topology, regulate the output voltage of filter I, it is carried out corresponding compensation.
The present embodiment can be realized the three phase power transmission by the mode of series connection or phase structure in parallel unit; By changing the transformer connection mode, can be provided for the zero-sequence current path of capacitive energy balance; Form with series connection half-bridge submodule replaces DC filter, can realize flexibly active power filtering, can realize fast Fault Isolation at DC Line Fault situation ShiShimonoseki outage discharge capacitor electric current simultaneously, can also realize the compensation of appearance value loss.
Should be noted that at last: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or be equal to replacement the specific embodiment of the present invention, and do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of the claim scope of the present invention.

Claims (10)

1. the Optimal Configuration Method of a modular multilevel flexible direct current system is characterized in that, described method comprises the steps:
(1) converter of configuration bipolar topology;
(2) according to the path of the converter of bipolar topology configuration capacitive energy balanced balanced current;
(3) the output voltage set point of calculating sub module by described path, according to output voltage set point control submodule, is used for realizing the capacitive energy balance.
2. Optimal Configuration Method as claimed in claim 1, it is characterized in that, the converter of the described configuration bipolar topology of step (1) is that negative pole and the positive pole by the converter of two tandem type topological structures is connected in same earth point, positive pole in addition is connected transmission line with negative pole, consist of the converter of bipolar topology, or
Negative pole and the positive pole of the converter by two parallel connection type topological structures are connected in same earth point, and positive pole in addition is connected transmission line with negative pole, consist of the converter of bipolar topology.
3. Optimal Configuration Method as claimed in claim 2, it is characterized in that, the converter of described tandem type topological structure be adopt that the A phase negative pole of single-phase convertor unit and B anodally mutually connect, B phase negative pole and C anodal connection mutually, A mutually anodal and C mutually negative pole respectively as the connection type of the both positive and negative polarity of DC line.
4. Optimal Configuration Method as claimed in claim 2, it is characterized in that, the converter of described parallel connection type topological structure is that employing A, B, C three-phase positive pole are anodal as DC line after connecting, A, B, the rear connection type as the DC line negative pole of C three-phase negative pole connection.
5. Optimal Configuration Method as claimed in claim 2, it is characterized in that, consist of if the converter of described bipolar topology is the converter by two tandem type topological structures, filter I then is set between positive pole and earth electrode, filter I is set between negative pole and earth electrode;
Described filter I is made of the submodule of series connection; Described submodule comprises electric capacity in parallel and the IGBT module of half-bridge structure.
6. Optimal Configuration Method as claimed in claim 2, it is characterized in that, consist of if the converter of described bipolar topology is the converter by two parallel connection type topological structures, then the dc output end at the converter of described bipolar topology is provided with filter I;
Described filter I is made of the submodule of series connection; Described submodule comprises electric capacity in parallel and the IGBT module of half-bridge structure.
7. Optimal Configuration Method as claimed in claim 1 is characterized in that, the method that the described converter according to bipolar topology of step (2) configures the path of capacitive energy balanced balanced current comprises:
AC at the converter of bipolar topology arranges filter II.
8. Optimal Configuration Method as claimed in claim 1 is characterized in that, the method that the described converter according to bipolar topology of step (2) configures the path of capacitive energy balanced balanced current comprises:
Increase an individual event three-winding transformer, the transformer of the corresponding AC network of its three windings; Described three windings adopt the heart-shaped mode that connects, and are provided with electric capacity and resistance between any two windings.
9. Optimal Configuration Method as claimed in claim 1 is characterized in that, the step of the output voltage set point of the described calculating sub module of step (3) comprises:
1) according to the actual submodule energy of three-phase with set the poor of energy, obtains Injection Current amplitude set point through controlling unit;
2) obtain the set point that triple-frequency harmonics injects according to current amplitude set point and phase settings;
3) triple-frequency harmonics set point and actual value are compared, through described controlling unit, obtain the output voltage set point of cascade submodule.
10. Optimal Configuration Method as claimed in claim 1 is characterized in that, when ageing loss appears in the capacity of the converter of bipolar topology, regulates the output voltage of filter I, and it is carried out corresponding compensation.
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CN103248018A (en) * 2013-05-10 2013-08-14 南京南瑞继保电气有限公司 DC protection implementation method of high-voltage DC transmission project
CN103269172A (en) * 2013-05-06 2013-08-28 浙江大学 Modular multi-level inverter bridge arm asymmetric control method
CN103633872A (en) * 2013-12-17 2014-03-12 山东大学 Capacitor voltage self-balancing circuit of modularized multi-level converter
CN103986178A (en) * 2014-05-09 2014-08-13 华北电力大学 LCC-HVDC topological structure and controllable sub-module charging initial voltage determining method thereof
CN104037754A (en) * 2014-06-12 2014-09-10 国家电网公司 Modularized multi-level flexible DC (Direct Current) topology circuit applicable to fault ride-through
CN104052026A (en) * 2014-05-29 2014-09-17 华中科技大学 Submodule topology for modular multi-level transverter and application of modular multi-level transverter
CN105226957A (en) * 2015-10-08 2016-01-06 西南交通大学 A kind of three-phase-single-phase potential device of no industrial frequency transformer
CN105375793A (en) * 2014-08-25 2016-03-02 国家电网公司 DC voltage compensation method of parallel hybrid multi-level inverter
CN106549567A (en) * 2016-10-13 2017-03-29 上海交通大学 Modularity high voltage induction and capacitor topology circuit
CN106655146A (en) * 2017-01-23 2017-05-10 特变电工新疆新能源股份有限公司 Configuration system and method for high-voltage flexible direct-current converter valve control apparatus

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103269172A (en) * 2013-05-06 2013-08-28 浙江大学 Modular multi-level inverter bridge arm asymmetric control method
CN103248018A (en) * 2013-05-10 2013-08-14 南京南瑞继保电气有限公司 DC protection implementation method of high-voltage DC transmission project
CN103633872B (en) * 2013-12-17 2015-12-09 山东大学 Modular multilevel converter capacitance voltage self-balancing circuit
CN103633872A (en) * 2013-12-17 2014-03-12 山东大学 Capacitor voltage self-balancing circuit of modularized multi-level converter
CN103986178A (en) * 2014-05-09 2014-08-13 华北电力大学 LCC-HVDC topological structure and controllable sub-module charging initial voltage determining method thereof
CN104052026A (en) * 2014-05-29 2014-09-17 华中科技大学 Submodule topology for modular multi-level transverter and application of modular multi-level transverter
CN104052026B (en) * 2014-05-29 2016-05-25 华中科技大学 For submodule topology and the application thereof of modularization multi-level converter
CN104037754A (en) * 2014-06-12 2014-09-10 国家电网公司 Modularized multi-level flexible DC (Direct Current) topology circuit applicable to fault ride-through
CN105375793A (en) * 2014-08-25 2016-03-02 国家电网公司 DC voltage compensation method of parallel hybrid multi-level inverter
CN105226957A (en) * 2015-10-08 2016-01-06 西南交通大学 A kind of three-phase-single-phase potential device of no industrial frequency transformer
CN106549567A (en) * 2016-10-13 2017-03-29 上海交通大学 Modularity high voltage induction and capacitor topology circuit
CN106655146A (en) * 2017-01-23 2017-05-10 特变电工新疆新能源股份有限公司 Configuration system and method for high-voltage flexible direct-current converter valve control apparatus
CN106655146B (en) * 2017-01-23 2019-09-17 特变电工新疆新能源股份有限公司 A kind of configuration system and method for high pressure flexible direct current change of current control valve device

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Effective date of registration: 20170601

Address after: 102209 Beijing City, Changping District science and Technology Park in the future smart grid research institute hospital

Co-patentee after: State Grid Shanghai Municipal Electric Power Company

Patentee after: GLOBAL ENERGY INTERCONNECTION RESEARCH INSTITUTE

Co-patentee after: State Grid Corporation of China

Address before: 102209 Beijing City, Changping District science and Technology Park in the future smart grid research institute hospital

Co-patentee before: China-EPRI Electric Power Engineering Co., Ltd.

Patentee before: GLOBAL ENERGY INTERCONNECTION RESEARCH INSTITUTE

Co-patentee before: State Grid Shanghai Municipal Electric Power Company

Co-patentee before: State Grid Corporation of China