CN102957378A - Modularized multi-level converter-based high-voltage high-capacity frequency changer system - Google Patents
Modularized multi-level converter-based high-voltage high-capacity frequency changer system Download PDFInfo
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- CN102957378A CN102957378A CN2012104356425A CN201210435642A CN102957378A CN 102957378 A CN102957378 A CN 102957378A CN 2012104356425 A CN2012104356425 A CN 2012104356425A CN 201210435642 A CN201210435642 A CN 201210435642A CN 102957378 A CN102957378 A CN 102957378A
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- voltage
- level converter
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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
- H02M1/32—Means for protecting converters other than automatic disconnection
Abstract
The invention discloses a modularized multi-level converter-based high-voltage high-capacity frequency changer system which consists of a power grid, a rectifier transformer, a diode rectifying system, a direct current filter capacitor, a modularized multi-level converter and an asynchronous motor. Compared with the conventional high-voltage high-capacity frequency changer, the modularized multi-level converter-based high-voltage high-capacity frequency changer system uses the common rectifier transformer rather than a secondary edge multi-winding transformer to power a direct current side, so that the cost can be saved, and the reliability can be improved; and one transformer can power a plurality of frequency changers, and the modularized multi-level converter adopts the carrier phase-shifting pulse width modulation, so that the dv/dt of the alternating current-side output voltage can be reduced.
Description
Technical field
The present invention relates to the application in the high-voltage large-capacity frequency convertor system of the current transformer application in the high-voltage large-capacity frequency convertor system, especially modular multi-level converter.
Background technology
Because energy shortage and ecological deterioration, adopt the power-saving technology of power electronic technology more and more to be subject to people's attention, and the most of load in the electric power system is asynchronous motor, and the speed governing of jumbo asynchronous motor is very difficult, therefore existing jumbo asynchronous machine directly is connected on the high voltage bus, energy dissipation is very huge, therefore can save a large amount of electric energy for jumbo asynchronous motor is equipped with frequency conversion speed-adjusting system, and energy-saving benefit is very huge.
Existing high-voltage large-capacity frequency converter adopts H bridge series circuit, and the DC side of each H bridge is isolated mutually, separately power supply; Rectifier transformer adopts many windings of secondary phase shifting transformer, and each secondary winding is given a H bridge power supply through diode rectification, so this transformer device structure is very complicated, and is expensive; When asynchronous machine needs higher voltage, just need more H bridge circuit series connection, the secondary winding of transformer also can increase, and this has limited the heap(ed) capacity of frequency converter.
This patent provides a kind of high-voltage large-capacity frequency converter based on modular multi-level converter, rectifier transformer adopts common two windings or three winding rectifier transformers, obtain a high voltage direct current through behind the diode rectification, utilize this high voltage direct current to power to modular multi-level converter, therefore the structure of rectifier transformer is simplified greatly, reduced cost.In addition, submodule adopts the half-bridge structure with the power consumption loop, starts the power consumption loop in the submodule overtension, guarantees that submodule voltage is in safe range.
Summary of the invention
It is low to the invention provides a kind of cost, and reliability is high, also is fit to the more high-voltage large-capacity frequency convertor system based on modular multi-level converter of voltage levels of larger capacity.
The present invention is achieved by the following technical solutions:
A kind of high-voltage large-capacity converter system based on modular multi-level converter is made of electrical network, reactive power compensation and filter circuit, rectifier transformer, diode rectifier circuit, dc filter capacitor, modular multi-level converter, asynchronous machine;
Described reactive power compensation and filter circuit are constituted by the electric components such as power electronic device, inductance, electric capacity, resistance, be connected in parallel between described electrical network and the described rectifier transformer, its objective is that the compensated current transformer system produces reactive power and filtering harmonic current;
Described diode rectifier circuit mainly is made of diode, the AC of described diode rectifier circuit is connected to the secondary of described rectifier transformer, the DC side of described diode rectifier circuit is in parallel with described dc filter capacitor, its objective is AC rectification is become direct current, and electric energy is transported to DC side from AC;
Described dc filter capacitor mainly is made of electric capacity, be connected in parallel on the DC side of described diode rectifier circuit and described modular multi-level converter, it act as the voltage fluctuation of the DC side that suppresses described diode rectifier circuit and the many level current transformers of module;
Described pusher side modular multi-level converter is made of three brachium pontis and three AC series reactors, three brachium pontis and described dc filter capacitor are connected in parallel, each brachium pontis is made of two change of current chains and two inductance series connection, each brachium pontis connects into up and down symmetrical structure, and export as AC the centre; Change of current chain is made of one or more submodule series connection, comprise DC component and fundamental component in the voltage of change of current chain output, alternating current component amplitude equal phase in the brachium pontis in the voltage of two change of current chain outputs is opposite, and the voltage sum of two change of current chain outputs in the brachium pontis is the voltage at described dc filter capacitor two ends; The effect of described pusher side modular multi-level converter is to be alternating current with dc inverter, and the rotating speed of control asynchronous machine;
Described submodule is made of power electronic device, electric capacity, resistance, contain DC component and first-harmonic alternating current component in the submodule output voltage (Uout), the switching signal of the turn-off device in the described submodule is relatively obtained by carrier wave and modulating wave, the certain angle of phase phasic difference of the corresponding carrier wave of each submodule in the described change of current chain consists of phase-shifting carrier wave pulse width modulation;
Comprise the power consumption loop in the described submodule, when the capacitance voltage in the described submodule is too high, start the power consumption loop, recently regulate the electric energy of loss in the power consumption circuit by controlling the duty that can turn-off power electronic device in the power consumption loop, in order to guarantee that capacitance voltage is in safe range.
One or more modular multi-level converters that are connected in parallel on the described dc filter capacitor, each modular multi-level converter are asynchronous motors power supply.
Advantage of the present invention is:
This patent uses common two windings or three winding rectifier transformers, compares with existing high-voltage large-capacity frequency convertor system, has reduced the complexity of rectifier transformer, has reduced cost;
The dv/dt of AC output voltage is less, and wave filter on AC side is become simply, does not even use alternating current filter;
This patent also is applicable to larger capacity and more high-tension large-capacity transducer system, and its complexity can not improve, and the conventional high-tension large-capacity transducer is when being applied to larger capacity and more high-tension frequency convertor system, and complexity will improve greatly.
Description of drawings
Fig. 1 is based on the high-voltage large-capacity frequency convertor system of modular multi-level converter.
The structure of Fig. 2 modular multi-level converter.
Fig. 3 sub modular structure figure.
Embodiment
A kind of high-voltage large-capacity converter system based on modular multi-level converter is made of electrical network, reactive power compensation and filter circuit, rectifier transformer, diode rectifier circuit, dc filter capacitor, modular multi-level converter, asynchronous machine;
Described reactive power compensation and filter circuit are constituted by the electric components such as power electronic device, inductance, electric capacity, resistance, be connected in parallel between described electrical network and the described rectifier transformer, its objective is that the compensated current transformer system produces reactive power and filtering harmonic current;
Described diode rectifier circuit mainly is made of diode, the AC of described diode rectifier circuit is connected to the secondary of described rectifier transformer, the DC side of described diode rectifier circuit is in parallel with described dc filter capacitor, its objective is AC rectification is become direct current, and electric energy is transported to DC side from AC;
Described dc filter capacitor mainly is made of electric capacity, be connected in parallel on the DC side of described diode rectifier circuit and described modular multi-level converter, it act as the voltage fluctuation of the DC side that suppresses described diode rectifier circuit and the many level current transformers of module;
Described pusher side modular multi-level converter is made of three brachium pontis and three AC series reactors, three brachium pontis and described dc filter capacitor are connected in parallel, each brachium pontis is made of two change of current chains and two inductance series connection, each brachium pontis connects into up and down symmetrical structure, and export as AC the centre; Change of current chain is made of one or more submodule series connection, comprise DC component and fundamental component in the voltage of change of current chain output, alternating current component amplitude equal phase in the brachium pontis in the voltage of two change of current chain outputs is opposite, and the voltage sum of two change of current chain outputs in the brachium pontis is the voltage at described dc filter capacitor two ends; The effect of described pusher side modular multi-level converter is to be alternating current with dc inverter, and the rotating speed of control asynchronous machine;
Described submodule is made of power electronic device, electric capacity, resistance, contain DC component and first-harmonic alternating current component in the submodule output voltage (Uout), the switching signal of the turn-off device in the described submodule is relatively obtained by carrier wave and modulating wave, the certain angle of phase phasic difference of the corresponding carrier wave of each submodule in the described change of current chain consists of phase-shifting carrier wave pulse width modulation;
Comprise the power consumption loop in the described submodule, when the capacitance voltage in the described submodule is too high, start the power consumption loop, recently regulate the electric energy of loss in the power consumption circuit by controlling the duty that can turn-off power electronic device in the power consumption loop, in order to guarantee that capacitance voltage is in safe range.
One or more modular multi-level converters that are connected in parallel on the described dc filter capacitor, each modular multi-level converter are asynchronous motors power supply.
Claims (2)
1. the high-voltage large-capacity converter system based on modular multi-level converter is made of electrical network, reactive power compensation and filter circuit, rectifier transformer, diode rectifier circuit, dc filter capacitor, modular multi-level converter, asynchronous machine;
Described reactive power compensation and filter circuit are constituted by the electric components such as power electronic device, inductance, electric capacity, resistance, be connected in parallel between described electrical network and the described rectifier transformer, its objective is that the compensated current transformer system produces reactive power and filtering harmonic current;
Described diode rectifier circuit mainly is made of diode, the AC of described diode rectifier circuit is connected to the secondary of described rectifier transformer, the DC side of described diode rectifier circuit is in parallel with described dc filter capacitor, its objective is AC rectification is become direct current, and electric energy is transported to DC side from AC;
Described dc filter capacitor mainly is made of electric capacity, be connected in parallel on the DC side of described diode rectifier circuit and described modular multi-level converter, it act as the voltage fluctuation of the DC side that suppresses described diode rectifier circuit and the many level current transformers of module;
Described pusher side modular multi-level converter is made of three brachium pontis and three AC series reactors, three brachium pontis and described dc filter capacitor are connected in parallel, each brachium pontis is made of two change of current chains and two inductance series connection, each brachium pontis connects into up and down symmetrical structure, and export as AC the centre; Change of current chain is made of one or more submodule series connection, comprise DC component and fundamental component in the voltage of change of current chain output, alternating current component amplitude equal phase in the brachium pontis in the voltage of two change of current chain outputs is opposite, and the voltage sum of two change of current chain outputs in the brachium pontis is the voltage at described dc filter capacitor two ends; The effect of described pusher side modular multi-level converter is to be alternating current with dc inverter, and the rotating speed of control asynchronous machine;
Described submodule is made of power electronic device, electric capacity, resistance, contain DC component and first-harmonic alternating current component in the submodule output voltage (Uout), the switching signal of the turn-off device in the described submodule is relatively obtained by carrier wave and modulating wave, the certain angle of phase phasic difference of the corresponding carrier wave of each submodule in the described change of current chain consists of phase-shifting carrier wave pulse width modulation;
Comprise the power consumption loop in the described submodule, when the capacitance voltage in the described submodule is too high, start the power consumption loop, recently regulate the electric energy of loss in the power consumption circuit by controlling the duty that can turn-off power electronic device in the power consumption loop, in order to guarantee that capacitance voltage is in safe range.
2. the high-voltage large-capacity converter system based on modular multi-level converter described in according to claim 1, it is characterized in that, one or more modular multi-level converters that are connected in parallel on the described dc filter capacitor, each modular multi-level converter are asynchronous motors power supply.
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| CN2012104356425A CN102957378A (en) | 2012-11-05 | 2012-11-05 | Modularized multi-level converter-based high-voltage high-capacity frequency changer system |
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| CN2012104356425A CN102957378A (en) | 2012-11-05 | 2012-11-05 | Modularized multi-level converter-based high-voltage high-capacity frequency changer system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016000757A1 (en) * | 2014-07-01 | 2016-01-07 | Siemens Aktiengesellschaft | Sub-module of a modular braking unit, braking unit, and method for operating the braking unit |
| EP2999103B1 (en) * | 2013-05-15 | 2019-08-28 | NR Electric Co., Ltd. | Converter and control method thereof |
| CN110703020A (en) * | 2019-10-12 | 2020-01-17 | 三一重能有限公司 | Wind power complete machine test bed and harmonic suppression method thereof |
| EP3780366A1 (en) * | 2019-08-13 | 2021-02-17 | Vestas Wind Systems A/S | Dc chopper for mmc cell with integrated chopper resistor |
| CN112688327A (en) * | 2021-01-07 | 2021-04-20 | 广东电网有限责任公司阳江供电局 | AC/DC filtering control method, device and system for DC power transmission system |
-
2012
- 2012-11-05 CN CN2012104356425A patent/CN102957378A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2999103B1 (en) * | 2013-05-15 | 2019-08-28 | NR Electric Co., Ltd. | Converter and control method thereof |
| WO2016000757A1 (en) * | 2014-07-01 | 2016-01-07 | Siemens Aktiengesellschaft | Sub-module of a modular braking unit, braking unit, and method for operating the braking unit |
| KR20170015965A (en) * | 2014-07-01 | 2017-02-10 | 지멘스 악티엔게젤샤프트 | Sub-module of a modular braking unit, braking unit, and method for operating the braking unit |
| US10199922B2 (en) | 2014-07-01 | 2019-02-05 | Siemens Aktiengesellschaft | Sub-module of a modular braking unit, braking unit, and method for operating the braking unit |
| KR102014002B1 (en) | 2014-07-01 | 2019-08-23 | 지멘스 악티엔게젤샤프트 | Sub-module of a modular braking unit, braking unit, and method for operating the braking unit |
| EP3780366A1 (en) * | 2019-08-13 | 2021-02-17 | Vestas Wind Systems A/S | Dc chopper for mmc cell with integrated chopper resistor |
| US11211878B2 (en) | 2019-08-13 | 2021-12-28 | Vestas Wind Systems A/S | DC chopper for MMC cell with integrated chopper resistor |
| US11563385B2 (en) | 2019-08-13 | 2023-01-24 | Vestas Wind Systems A/S | DC chopper for MMC cell with integrated chopper resistor |
| CN110703020A (en) * | 2019-10-12 | 2020-01-17 | 三一重能有限公司 | Wind power complete machine test bed and harmonic suppression method thereof |
| CN110703020B (en) * | 2019-10-12 | 2021-11-26 | 三一重能股份有限公司 | Wind power complete machine test bed and harmonic suppression method thereof |
| CN112688327A (en) * | 2021-01-07 | 2021-04-20 | 广东电网有限责任公司阳江供电局 | AC/DC filtering control method, device and system for DC power transmission system |
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Application publication date: 20130306 |