CN103066587B - A kind of Optimal Configuration Method of modular multi-level flexible direct current system - Google Patents
A kind of Optimal Configuration Method of modular multi-level flexible direct current system Download PDFInfo
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- CN103066587B CN103066587B CN201210537281.5A CN201210537281A CN103066587B CN 103066587 B CN103066587 B CN 103066587B CN 201210537281 A CN201210537281 A CN 201210537281A CN 103066587 B CN103066587 B CN 103066587B
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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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion 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
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/4835—Converters 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
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0095—Hybrid converter topologies, e.g. NPC mixed with flying capacitor, thyristor converter mixed with MMC or charge pump mixed with buck
Abstract
The Optimal Configuration Method of a kind of modular multi-level flexible direct current system provided by the invention, comprising step has: the converter of (1) configuration bipolar topology; (2) according to the path of the converter configuration capacitive energy balanced balanced current of bipolar topology; (3) the output voltage set point of calculating sub module, by described path, according to output voltage set value calculation submodule, for realizing capacitive energy balance.The present invention uses component number few, low price, is easy to realize high-voltage large-capacity overhead wire transmission structure, and its equilibrium strategy effectively can realize capacitive energy balance.
Description
Technical field
The invention belongs to Technology of HVDC based Voltage Source Converter field, be specifically related to a kind of Optimal Configuration Method of modular multi-level flexible direct current system.
Background technology
Flexible direct current power transmission system is the DC transmission system based on the voltage source converter being core with wholly-controled device (IGBT), its superior performance, application scalability is good, have broad application prospects in multiple fields such as wind power integration, Power System Interconnection, urban electricity supply and island with power, in recent years, modular multi-level flexible direct-current transmission technical development is very rapid.
The converter of flexible direct current power transmission system is its core parts, for realizing the conversion of alterating and direct current tolerance, the development of high pressure flexible direct current converter is from original two level topologys, three-level topology, change present modular multilevel topology gradually into, it is made up of 6 brachium pontis, and upper and lower two brachium pontis are an individual event convertor unit.Each brachium pontis is by multiple submodule (Submodule, SM) be in series, submodule is by two (or four) IGBT (Insulated Gate BipolarTransistor, insulated gate bipolar transistor) and capacitor composition half-bridge (or full-bridge) structure, as depicted in figs. 1 and 2.Its operation principle is turning on and off by IGBT device, electric capacity dropped into circuit or exit circuit, reasonably control the input of multiple submodule and exit, just can form stable voltage in alternating current-direct current side, thus form stable system works point and carry out power delivery, as shown in Figure 2.
But, existing modular multilevel technology adopts multiple submodule to superpose, need a large amount of electric capacity and IGBT device, according to full-bridge topology, the number of devices needed is more, price is very expensive, adopts novel topology to reduce system cost, and by system from cable application be generalized to overhead wire application become very important research direction.
The proposition of novel topological structure is that flexible direct current provides brand-new method to the development of high-voltage large-capacity overhead wire field.New Topological price is relatively low, and loss is little, can realize Large Copacity classes of applications, have broad application prospects.
In prior art, its topological structure mainly contains three basic structures, structure one is the form adopting full-bridge sub module cascade and IGBT guide switch to combine, and can realize power delivery, can realize alternating current-direct current fault traversing simultaneously when applying less submodule; Structure two adopts single-phase full bridge structure and the series-parallel form of half-bridge sub module cascade structure, realizes power delivery, but structure two is difficult to realize DC Line Fault passes through, and AC fault also needs the control realization by complexity; The structure three that article proposes, the i.e. topological structure described as shown in Figure 4 and Figure 5, realize power delivery by series connection or the mode of parallel connection, simultaneously owing to adopting full-bridge cascade, alternating current-direct current fault traversing realizes simple.
For the structure of said structure two, its topological structure developed is difficult to realize DC Line Fault and passes through.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of Optimal Configuration Method of modular multi-level flexible direct current system, realize capacitive energy balance.
The Optimal Configuration Method of a kind of modular multi-level flexible direct current system provided by the invention, its improvements are, described method comprises the steps:
(1) converter of bipolar topology is configured;
(2) according to the path of the converter configuration capacitive energy balanced balanced current of bipolar topology;
(3) the output voltage set point of calculating sub module, by described path, according to output voltage set value calculation submodule, for realizing capacitive energy balance.
Wherein, the converter of step (1) described configuration bipolar topology is connected to same earth point by the negative pole of the converter of two tandem type topological structures and positive pole, and other positive pole is connected transmission line with negative pole, forms the converter of bipolar topology, or
Be connected to same earth point by the negative pole of the converter of two parallel connection type topological structures and positive pole, other positive pole is connected transmission line with negative pole, forms the converter of bipolar topology.
Wherein, the converter of described tandem type topological structure adopts the A phase negative pole of single-phase convertor unit and the connection of B phase positive pole, B phase negative pole and the connection of C phase positive pole, and A phase positive pole and C phase negative pole are 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 as DC line positive pole after adopting A, B, C three-phase positive pole to connect, as the connection type of DC line negative pole after the connection of A, B, C three-phase negative pole.
Wherein, if the converter of described bipolar topology consists of the converter of two tandem type topological structures, then filter I is set between positive pole and earth electrode, filter I is set between negative pole and earth electrode;
Described filter I is made up of the submodule of connecting; Described submodule comprises electric capacity in parallel and the IGBT module of half-bridge structure.
Wherein, if the converter of described bipolar topology consists of the converter of two parallel connection type topological structures, then the DC output end of the converter of described bipolar topology is provided with filter I;
Described filter I is made up of the submodule of connecting; Described submodule comprises electric capacity in parallel and the IGBT module of half-bridge structure.
Wherein, the method for the path of step (2) the described configuration of the converter according to bipolar topology capacitive energy balanced balanced current comprises:
At the AC of the converter of bipolar topology, filter II is set.
Wherein, the method for the path of step (2) the described configuration of the converter according to bipolar topology 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 winding adopts the heart-shaped mode connected, and is provided with electric capacity and resistance between any two windings.
Wherein, the step of the output voltage set point of step (3) described calculating sub module comprises:
1) according to the actual submodule energy of three-phase and the difference setting energy, Injection Current amplitude set point is obtained through controlling unit;
2) set point of third-harmonic zero-sequence voltage is obtained 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, corresponding compensation is carried out to it.
Compared with the prior art, beneficial effect of the present invention is:
1, the present invention uses component number few, low price, is easy to realize high-voltage large-capacity overhead wire transmission structure;
2, the equilibrium strategy that the present invention proposes effectively can realize capacitive energy balance;
3, transformer connection form of the present invention and related pathways design effectively can provide capacitive energy balanced balanced current path;
4, filter configuration scheme of the present invention both can filtering harmonic wave flexibly, also can blocking capacitor discharging current, and can compensate the capacitance loss that long-term ageing causes;
5, two kinds of the present invention's proposition can realize the topology of three-phase structure by phase structure combination, can effectively realize alternating current-direct current fault traversing, simultaneously, the topology proposed or transformer configuration method can effectively realize system voltage balance policy, the optional design of filter scheme of one simultaneously proposed effectively can realize active power filtering, block fault current, can also compensate the capacitance loss because component ageing causes simultaneously.
Accompanying drawing explanation
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 path collocation 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 realization.
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 multi-level flexible direct current system that the present embodiment provides, its flow chart as shown in Figure 10, specifically comprises the steps:
(1) configure the converter of bipolar topology, its structure chart as shown in Figure 6;
The converter of described configuration bipolar topology is connected to same earth point by the negative pole of the converter of two tandem type topological structures and positive pole, and other positive pole and negative pole are connected to transmission line, form the converter of bipolar topology, or
Be connected to same earth point by the negative pole of the converter of two parallel connection type topological structures and positive pole, other positive pole and negative pole are connected to transmission line, form the converter of bipolar topology.
If the converter of described bipolar topology consists of the converter of two tandem type topological structures, then filter I is set between positive pole and earth electrode, filter I is set between negative pole and earth electrode; If the converter of described bipolar topology consists of the converter of two parallel connection type topological structures, then the DC output end of the converter of described bipolar topology is provided with filter I;
Described filter I is used for filtering harmonic wave, is made up 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 adopts the A phase negative pole of single-phase convertor unit and the connection of B phase positive pole, B phase negative pole and the connection of C phase positive pole, and A phase positive pole and C phase negative pole are respectively as the connection type of the both positive and negative polarity of DC line.The converter of parallel connection type topological structure is as DC line positive pole after adopting A, B, C three-phase positive pole to connect, as the connection type of DC line negative pole after the connection of A, B, C three-phase negative pole.
(2) according to the path of the converter configuration capacitive energy balanced balanced current of bipolar topology, it is realized by two kinds of modes;
1. filter is set at the AC of the converter of bipolar topology, as shown in Figure 7 (this figure only draws the half of dipolar configuration, and its second half principle and structure therewith part are the same).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 winding adopts the heart-shaped mode connected, and is provided with the mode that electric capacity and resistance (as Suo Shi 10 in figure) its electric capacity and resistance take serial or parallel connection between any two windings, and its value is according to the phase requirements setting of injecting triple-frequency harmonics.
(3) the output voltage set point of calculating sub module, by described path, according to output voltage set value calculation submodule, for realizing 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 and the difference setting energy, Injection Current amplitude set point is obtained through controlling unit (as proportional integral link, two feedback element);
2) set point of third-harmonic zero-sequence voltage is obtained 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 triple-frequency harmonics setting is set with fundamental component to superpose as totally inputting, and concentrates and carry out Current Control tracking;
When ageing loss appears in the capacity of the converter of bipolar topology, regulate the output voltage of filter I, corresponding compensation is carried out to it.
The present embodiment passes through the mode of series connection or parallel single-phase construction unit, can realize three phase power transmission; By changing transformer connection mode, the zero-sequence current path of capacitive energy balance can be provided for; Replace DC filter with the form of series half-bridge submodule, can realize active power filtering flexibly, can break in DC Line Fault situation ShiShimonoseki capacitance discharge current simultaneously, realizes Fault Isolation fast, can also realize the compensation of capacitance loss.
Finally should be noted that: 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 to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or equivalent replacement, and not departing from any amendment of spirit and scope of the invention or equivalent replacement, it all should be encompassed in the middle of right of the present invention.
Claims (1)
1. an Optimal Configuration Method for modular multi-level flexible direct current system, is characterized in that, described method comprises the steps:
(1) converter of bipolar topology is configured;
The converter of described configuration bipolar topology is connected to same earth point by the negative pole of the converter of two tandem type topological structures and positive pole, other positive pole is connected transmission line with negative pole, form the converter of bipolar topology, or be connected to same earth point by the negative pole of the converter of two parallel connection type topological structures and positive pole, other positive pole is connected transmission line with negative pole, forms the converter of bipolar topology;
(2) according to the path of the converter configuration capacitive energy balanced balanced current of bipolar topology;
The concrete grammar of described step (2) comprising: arrange filter II at the AC of the converter of bipolar topology or increase a single-phase three-winding transformer, the transformer of the corresponding AC network of its three windings; Described three winding adopts the mode of Y-connection, is provided with electric capacity and resistance between any two windings;
(3) the output voltage set point of calculating sub module, by the path of described converter configuration capacitive energy balanced balanced current, according to output voltage set value calculation submodule, for realizing capacitive energy balance;
The step of the output voltage set point of described calculating sub module comprises:
1) according to the actual submodule energy of three-phase and the difference setting energy, Injection Current amplitude set point is obtained through controlling unit;
2) set point of third-harmonic zero-sequence voltage is obtained 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;
The converter of described tandem type topological structure adopts that the A phase negative pole of single-phase convertor unit is connected with B phase positive pole, B phase negative pole is connected with C phase positive pole, and A phase positive pole and C phase negative pole are respectively as the connection type of the both positive and negative polarity of DC line;
The converter of described parallel connection type topological structure is as DC line positive pole after adopting A, B, C three-phase positive pole to connect, as the connection type of DC line negative pole after A, B, C three-phase negative pole connects;
If the converter of described bipolar topology consists of the converter of two tandem type topological structures, then filter I is set between positive pole and earth electrode, filter I is set between negative pole and earth electrode;
Described filter I is made up of the submodule of connecting; Described submodule comprises the IGBT module of electric capacity and half-bridge structure;
If the converter of described bipolar topology consists of the converter of two parallel connection type topological structures, then the DC output end of the converter of described bipolar topology is provided with filter I;
Described filter I is made up of the submodule of connecting; Described submodule comprises the IGBT module of electric capacity and half-bridge structure;
When ageing loss appears in the capacity of the converter of bipolar topology, regulate the output voltage of filter I, corresponding compensation is carried out to it.
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| 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 |
| CN103986178B (en) * | 2014-05-09 | 2017-01-04 | 华北电力大学 | A kind of LCC-HVDC topological structure and controlled submodule charging initial voltage thereof determine method |
| 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 |
| CN104037754B (en) * | 2014-06-12 | 2016-08-31 | 国家电网公司 | A kind of modular multi-level flexible direct current topological circuit being applicable to fault traversing |
| CN105375793B (en) * | 2014-08-25 | 2018-05-08 | 国家电网公司 | A kind of DC voltage compensation method of parallel connection mixed type multilevel converter |
| 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 |
| 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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Address after: 102209 Beijing City, Changping District science and Technology Park in the future smart grid research institute hospital Co-patentee after: CHINA-EPRI ELECTRIC POWER ENGINEERING Co.,Ltd. Patentee after: GLOBAL ENERGY INTERCONNECTION Research Institute Co-patentee after: STATE GRID SHANGHAI MUNICIPAL ELECTRIC POWER Co. Co-patentee after: State Grid Corporation of China Address before: 102211 Beijing city Changping District Xiaotangshan town big East Village Road No. 270 (future technology city) Co-patentee before: CHINA-EPRI ELECTRIC POWER ENGINEERING Co.,Ltd. Patentee before: STATE GRID SMART GRID Research Institute Co-patentee before: SHANGHAI MUNICIPAL ELECTRIC POWER Co. Co-patentee before: State Grid Corporation of China |
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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 Co. 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 Co. Co-patentee before: State Grid Corporation of China |