CN103001520B - Modular multi-level three-phase voltage source converter - Google Patents
Modular multi-level three-phase voltage source converter Download PDFInfo
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- CN103001520B CN103001520B CN201210576579.7A CN201210576579A CN103001520B CN 103001520 B CN103001520 B CN 103001520B CN 201210576579 A CN201210576579 A CN 201210576579A CN 103001520 B CN103001520 B CN 103001520B
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- 239000004065 semiconductor Substances 0.000 claims description 59
- 239000003990 capacitor Substances 0.000 claims description 22
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 230000002459 sustained effect Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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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
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention relates to a modular multilevel three-phase voltage source converter, and belongs to the field of electric automation equipment. The converter comprises six converter arms and six filter reactors; three positive terminals of the first group of three converter arms are connected together to be used as direct current positive terminals of the converter, negative terminals of the three converter arms are respectively connected to one ends of the first group of three filter reactors, and the other ends of the first group of three filter reactors are respectively used as three-phase alternating current phase line ends of the converter; three negative ends of the second group of three converter arms are connected together to serve as a direct current negative end of the converter, positive ends of the three converter arms are respectively connected to one ends of the second group of three filter reactors, and the other ends of the second group of three filter reactors are respectively connected to a three-phase alternating current phase line end of the converter. The modular multilevel three-phase voltage source converter can realize the application of multilevel high-voltage conversion, realize the back-to-back connection of the direct current sides of two converters and realize the protection when the direct current sides are short-circuited.
Description
Technical field
The present invention relates to a kind of modular multilevel three-phase voltage source current transformer, belong to electric automatization apparatus field.
Background technology
Voltage source converter is widely used in RHVC, STATCOM etc.In the time of high-voltage applications, generally all required power semiconductor device connects to realize, or adopts many level current transformers, as chain type current transformer.The shortcoming of chain type current transformer is to have multiple independently DC power supply, its DC side that cannot realize two current transformers is connected back-to-back, or be applied to direct current transportation.
The DC side that existing modular multilevel voltage source converter can be realized two current transformers connects back-to-back, but current transformer cannot be realized effective protection when dc-side short-circuit.
Summary of the invention
The object of the invention is to propose a kind of modular multilevel three-phase voltage source current transformer; change the structure of existing three-phase voltage source current transformer; protection when be short-circuited fault to realize DC side, realizes high-voltage applications, realizes again two current transformer DC side and connects back-to-back simultaneously.
The modular multilevel three-phase voltage source current transformer that the present invention proposes, comprises first group of three convertor arm, second group of three convertor arm, first group of three filter reactor and second group of three filter reactor; Three positive terminals of first group of described three convertor arm connect together the direct-flow positive pole end of the modular multilevel three-phase voltage source current transformer described in rear conduct, three negative pole ends of first group of three convertor arm are connected respectively to one end of first group of three filter reactor, and the other end of first group of three filter reactor is respectively as the three-phase alternating current phase line end of described modular multilevel three-phase voltage source current transformer; Three negative pole ends of second group of three convertor arm connect together the direct current negative pole end of the modular multilevel three-phase voltage source current transformer described in rear conduct, three positive terminals of second group of three convertor arm are connected respectively to one end of second group of three filter reactor, and the other end of second group of three filter reactor is connected respectively to the three-phase alternating current phase line end of described modular multilevel three-phase voltage source current transformer.
In above-mentioned modular multilevel three-phase voltage source current transformer, described convertor arm, comprises multiple unsteady flow modules, and multiple unsteady flow modules adopt to be connected in series and form a positive terminal and a negative pole end.Unsteady flow module comprises the first direct current capacitor, the second direct current capacitor, the first semiconductor switch, the second semiconductor switch, the 3rd semiconductor switch, the first fly-wheel diode, the second fly-wheel diode, the 3rd fly-wheel diode, clamping diode, resistance capaciting absorpting circuit and grading resistor; The collector electrode of described the first semiconductor switch, the second semiconductor switch and the 3rd semiconductor switch is connected with described the first fly-wheel diode, the second fly-wheel diode and the negative electrode of the 3rd fly-wheel diode respectively, and the emitter of described the first semiconductor switch, the second semiconductor switch and the 3rd semiconductor switch is connected with described the first fly-wheel diode, the second fly-wheel diode and the anode of the 3rd fly-wheel diode respectively; The positive terminal of the first described direct current capacitor is connected with the collector electrode of the first described semiconductor switch; The negative electrode of the negative pole end of the first described direct current capacitor and described the second direct current capacitor positive terminal and described clamp diode is connected; The emitter of the first described semiconductor switch is connected as the positive terminal of unsteady flow module with the collector electrode of the second semiconductor switch, and the emitter of the second described semiconductor switch is connected with the negative pole end of the emitter of the 3rd semiconductor switch and the second direct current capacitor; The anode of described clamping diode is connected as the negative pole end of unsteady flow module with the 3rd described semi-conductive collector electrode; Described resistance capaciting absorpting circuit and grading resistor are parallel to respectively the collector and emitter of the 3rd semiconductor switch.
The modular multilevel three-phase voltage source current transformer that the present invention proposes; its advantage is: can realize the high pressure unsteady flow application of many level; the DC side of two current transformers can form back-to-back and connect, and in the time that DC side is short-circuited fault, can realize the protection of current transformer self.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of modular multilevel three-phase voltage source current transformer of the present invention.
Fig. 2 is the circuit theory diagrams of convertor arm in the modular multilevel three-phase voltage source current transformer shown in Fig. 1.
Fig. 3 is the circuit theory diagrams of unsteady flow module in the convertor arm shown in Fig. 2.
In Fig. 1-Fig. 3, the 1st, convertor arm, the 2nd, filter reactor, the 3rd, unsteady flow module, 4 is the first direct current capacitor and the second direct current capacitor, the 5th, semiconductor switch, the 6th, fly-wheel diode, the 7th, resistance capaciting absorpting circuit, the 8th, grading resistor, the 9th, clamping diode.
Embodiment
The modular multilevel three-phase voltage source current transformer that the present invention proposes, comprises first group of three convertor arm 1, second group of three convertor arm, first group of three filter reactor 2 and second group of three filter reactor.Three positive terminals of first group of three convertor arm connect together the direct-flow positive pole end of the modular multilevel three-phase voltage source current transformer described in rear conduct, three negative pole ends of first group of three convertor arm are connected respectively to one end of first group of three filter reactor, and the other end of first group of three filter reactor is respectively as the three-phase alternating current phase line end of described modular multilevel three-phase voltage source current transformer; Three negative pole ends of second group of three convertor arm connect together the direct current negative pole end of the modular multilevel three-phase voltage source current transformer described in rear conduct, three positive terminals of second group of three convertor arm are connected respectively to one end of second group of three filter reactor, and the other end of second group of three filter reactor is connected respectively to the three-phase alternating current phase line end of described modular multilevel three-phase voltage source current transformer.
As shown in Figure 1, three-phase voltage source current transformer comprises two groups of six convertor arms 1, two groups of six filter reactors 2.The positive terminal of first group of three convertor arm connects together the rear direct-flow positive pole end DC+ as three-phase voltage source current transformer; The negative pole end of first group of three convertor arm is connected respectively to one end of first group of three filter reactor LA1, LB1, LC1, and the other end of LA1, LB1, LC1 is respectively as three-phase alternating current phase line end A, B, the C of three-phase voltage source current transformer.The negative pole end of second group of three convertor arm connects together the rear direct current negative pole end DC-as three-phase voltage source current transformer; The positive terminal of second group of three convertor arm is connected respectively to one end of second group of three filter reactor LA2, LB2, LC2, and the other end of second group of three filter reactor is connected respectively to three-phase alternating current phase line end A, B, the C of three-phase voltage source current transformer.
As shown in Figure 2, each convertor arm comprises several unsteady flow modules 3, and all unsteady flow modules adopt and are connected in series (negative pole end that the positive terminal of a unsteady flow module is connected to another unsteady flow module), form a positive terminal "+" and a negative pole end "-".
As shown in Figure 3, each unsteady flow module comprises the first direct current capacitor C1, the second direct current capacitor C2, the first semiconductor switch S1, the second semiconductor switch S2, the 3rd semiconductor switch S3, the first sustained diode 1, the second sustained diode 2, the 3rd sustained diode 3, clamping diode D4, resistance capaciting absorpting circuit 7 and grading resistor 8.The collector electrode of the first semiconductor switch S1, the second semiconductor switch S2 and the 3rd semiconductor switch S3 is connected with the negative electrode of the 3rd sustained diode 3 with the first sustained diode 1, the second sustained diode 2 respectively, and the emitter of the first semiconductor switch S1, the second semiconductor switch S2 and the 3rd semiconductor switch S3 is connected with the anode of the 3rd sustained diode 3 with the first sustained diode 1, the second sustained diode 2 respectively.The positive terminal of the first direct current capacitor C1 is connected with the collector electrode of the first semiconductor switch S1, and the negative pole end of the first direct current capacitor C1 is connected with the negative electrode of the second direct current capacitor C2 positive terminal and clamp diode D4; The emitter of the first semiconductor switch S1 is connected with the collector electrode of the second semiconductor switch S2 as the positive terminal "+" of unsteady flow module, and the emitter of the second semiconductor switch S2 is connected with the emitter of the 3rd semiconductor switch S3 and the negative pole end of the second direct current capacitor C2; The anode of clamping diode D4 is connected with the collector electrode of the 3rd semiconductor S3 as the negative pole end "-" of unsteady flow module; Resistance capaciting absorpting circuit 7 is made up of resistance R S and capacitor C S, is connected in parallel on the collector and emitter of the 3rd semiconductor switch S3 after resistance R S and capacitor C S series connection, and grading resistor RJ is also connected in parallel on the collector and emitter of the 3rd semiconductor switch S3.
Modular multilevel three-phase voltage source current transformer of the present invention while normally work, applies conducting gate electrode drive signals to the 3rd semiconductor switch S3 always, makes S3 always in conducting state.In the time detecting current transformer dc-side short-circuit fault; the first semiconductor switch S1, the second semiconductor switch S2 of all unsteady flow modules and the 3rd semiconductor switch S3 locking are immediately turn-offed; short circuit current can decline rapidly, thereby effectively protects the semiconductor switch of all unsteady flow modules and fly-wheel diode normally to work.
The first semiconductor switch S1, the second semiconductor switch S2 and the 3rd semiconductor switch S3 in circuit of the present invention, can use any turn-off semiconductor switch, S3 also can use phase controlled thyristors (controllable silicon) (the corresponding collector electrode of anode, the corresponding emitter of negative electrode).When S3 uses phase controlled thyristors (controllable silicon), clamping diode can save, and when the locking of protection action S3 gate pulse, if its electric current is to flow to negative electrode from anode, this electric current is through can being naturally reduced to zero after a period of time.Any equivalent transformation circuit of doing based on circuit of the present invention, all belongs to protection scope of the present invention.
Claims (1)
1. a modular multilevel three-phase voltage source current transformer, it is characterized in that, this modular multilevel three-phase voltage source current transformer comprises first group of three convertor arm, second group of three convertor arm, first group of three filter reactor and second group of three filter reactor; Three positive terminals of first group of described three convertor arm connect together the direct-flow positive pole end of the modular multilevel three-phase voltage source current transformer described in rear conduct, three negative pole ends of first group of three convertor arm are connected respectively to one end of first group of three filter reactor, and the other end of first group of three filter reactor is respectively as the three-phase alternating current phase line end of described modular multilevel three-phase voltage source current transformer; Three negative pole ends of second group of three convertor arm connect together the direct current negative pole end of the modular multilevel three-phase voltage source current transformer described in rear conduct, three positive terminals of second group of three convertor arm are connected respectively to one end of second group of three filter reactor, and the other end of second group of three filter reactor is connected respectively to the three-phase alternating current phase line end of described modular multilevel three-phase voltage source current transformer;
Wherein said convertor arm, comprise multiple unsteady flow modules, multiple unsteady flow modules adopt and are connected in series the positive terminal and the negative pole end that form convertor arm, and unsteady flow module comprises the first direct current capacitor, the second direct current capacitor, the first semiconductor switch, the second semiconductor switch, the 3rd semiconductor switch, the first fly-wheel diode, the second fly-wheel diode, the 3rd fly-wheel diode, clamping diode, resistance capaciting absorpting circuit and grading resistor; The collector electrode of described the first semiconductor switch, the second semiconductor switch and the 3rd semiconductor switch is connected with described the first fly-wheel diode, the second fly-wheel diode and the negative electrode of the 3rd fly-wheel diode respectively, and the emitter of described the first semiconductor switch, the second semiconductor switch and the 3rd semiconductor switch is connected with described the first fly-wheel diode, the second fly-wheel diode and the anode of the 3rd fly-wheel diode respectively; The positive terminal of the first described direct current capacitor is connected with the collector electrode of the first described semiconductor switch; The negative electrode of the negative pole end of the first described direct current capacitor and described the second direct current capacitor positive terminal and described clamping diode is connected; The emitter of the first described semiconductor switch is connected as the positive terminal of unsteady flow module with the collector electrode of the second semiconductor switch, and the emitter of the second described semiconductor switch is connected with the negative pole end of the emitter of the 3rd semiconductor switch and the second direct current capacitor; The anode of described clamping diode is connected as the negative pole end of unsteady flow module with the collector electrode of described the 3rd semiconductor switch; Described resistance capaciting absorpting circuit and grading resistor are parallel to respectively the collector and emitter of the 3rd semiconductor switch.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210576579.7A CN103001520B (en) | 2012-12-26 | 2012-12-26 | Modular multi-level three-phase voltage source converter |
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| CN201210576579.7A CN103001520B (en) | 2012-12-26 | 2012-12-26 | Modular multi-level three-phase voltage source converter |
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| CN103001520A CN103001520A (en) | 2013-03-27 |
| CN103001520B true CN103001520B (en) | 2014-08-20 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326608B (en) * | 2013-06-06 | 2016-07-06 | 南京南瑞继保电气有限公司 | One seed module, facies unit, voltage-source type multilevel converter and control method |
| CN104300814B (en) * | 2013-07-18 | 2017-02-15 | 南京南瑞继保电气有限公司 | Modularized multi-level voltage source current converter and control method thereof |
| CN103516243B (en) * | 2013-10-10 | 2015-09-30 | 清华大学 | A kind of modular multi-level converter unsteady flow modular circuit with short-circuit protection |
| CN104009446B (en) * | 2014-02-27 | 2018-05-18 | 南京南瑞继保电气有限公司 | A kind of DC transmission protection device, transverter and guard method |
| CN103838966B (en) * | 2014-02-27 | 2017-09-01 | 国家电网公司 | A kind of modeling and simulating method based on half-bridge submodule voltage source converter |
| CN105099245B (en) * | 2015-08-11 | 2018-05-01 | 南方电网科学研究院有限责任公司 | Equivalent simulation method for submodule of diode clamping type modular multilevel converter |
| CN206451593U (en) * | 2016-12-29 | 2017-08-29 | 南通富力机电设备有限责任公司 | A kind of Multi Role Aircraft reactance device and Multi Role Aircraft output circuit |
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| CN101253664A (en) * | 2005-08-26 | 2008-08-27 | 西门子公司 | Inverter circuit with distributed energy stores |
| DE102009057288A1 (en) * | 2009-12-01 | 2011-06-09 | Siemens Aktiengesellschaft | Inverters for high voltages |
| CN102403886A (en) * | 2011-11-03 | 2012-04-04 | 南方电网科学研究院有限责任公司 | Protection method for instantaneous short-circuit fault of direct-current line of modular multilevel converter |
| CN203086368U (en) * | 2012-12-26 | 2013-07-24 | 清华大学 | Modular multi-level three-phase voltage source converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2012116738A1 (en) * | 2011-03-01 | 2012-09-07 | Abb Research Ltd | Fault current limitation in dc power transmission systems |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101253664A (en) * | 2005-08-26 | 2008-08-27 | 西门子公司 | Inverter circuit with distributed energy stores |
| DE102009057288A1 (en) * | 2009-12-01 | 2011-06-09 | Siemens Aktiengesellschaft | Inverters for high voltages |
| CN102403886A (en) * | 2011-11-03 | 2012-04-04 | 南方电网科学研究院有限责任公司 | Protection method for instantaneous short-circuit fault of direct-current line of modular multilevel converter |
| CN203086368U (en) * | 2012-12-26 | 2013-07-24 | 清华大学 | Modular multi-level three-phase voltage source converter |
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