CN202034907U - H bridge serial connection multilevel voltage sag generator based on IGBT - Google Patents
H bridge serial connection multilevel voltage sag generator based on IGBT Download PDFInfo
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- CN202034907U CN202034907U CN2011200682248U CN201120068224U CN202034907U CN 202034907 U CN202034907 U CN 202034907U CN 2011200682248 U CN2011200682248 U CN 2011200682248U CN 201120068224 U CN201120068224 U CN 201120068224U CN 202034907 U CN202034907 U CN 202034907U
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Abstract
The utility model relates to an H bridge serial connection multilevel voltage sag generator based on IGBT. The voltage sag generator is an energy feedback type four-quadrant current transformer, and can realize bidirectional flow of the energy. An input end of the voltage sag generator is connected with an electric network, and an output of the voltage sag generator is connected with a measured system. In the energy feedback type four-quadrant current transformer, a plurality of low voltage H bridge frequency conversion power units in serial connection are superposed to from a phase, three phases are connected in a Y type and are connected with a measured wind generation system or a photovoltaic power generation system. Rectification side of the H bridge frequency conversion power unit is an IGBT controllable device three phase controllable full bridge and charges a filtering capacitor after rectification, and an output side comprises four contravariant IGBT controllable devices. The voltage sag generator can not only outputs electric network voltage sag waveform stipulated in Technical Rule for Connecting Wind Farm to Power System, but also freely set other sag depths and times. The voltage sag generator is small in self loss, and can be applied to research analysis on tide and idle work.
Description
Technical field
The utility model relates in the power electronics industry the multiple-level serially connected voltage falling generator of H bridge power unit (VSG) based on IGBT.
Background technology
Generally, when electrical network breaks down when causing voltage than great fluctuation process, wind generator system is off-grid automatically just, and along with the increase of wind-powered electricity generation installed capacity, the method for this reply voltage fluctuation can not be ignored the influence of electrical network.At present, the more prevailing countries of wind power generation, formulated new operation of power networks criterion in succession as states such as Denmark, Germany, require wind power system to have low voltage ride-through capability LVRT (Low Voltage Ride-Through), have only when electric network electric voltage drop after to a certain degree, just to allow the wind energy conversion system off-grid.China in " wind energy turbine set insert power system technology regulation " of promulgation in 2009 regulation installed capacity accounts for its power supply total capacity ratio greater than 5% province (zone) level electrical network for wind-powered electricity generation, the wind turbine generator of moving in this electrical network zone should have low voltage ride-through capability.
For the low voltage ride-through capability of testing wind power generation unit, the wind-driven generator pilot system just needs to simulate the device of electric network electric voltage drop, i.e. voltage falling generator (VSG).Existing (VSG) mainly contains impedance form and transformer form both at home and abroad, but the electric voltage dropping degree of depth and frequency fluctuation control flexibly that these two kinds of form voltage falling generators (VSG) produce, and energy loss is bigger, is difficult for carrying out trend and idle researching and analysing.Therefore desirable VSG should be able to set fault type and the electric voltage dropping degree of depth, time, can not only detect the low voltage ride-through capability of system under test (SUT), and can carry out trend and idle researching and analysing.
Summary of the invention
For solving prior art problems, the purpose of this utility model provides a kind of multiple-level serially connected voltage falling generator of H bridge (VSG) based on IGBT, the electric network electric voltage drop waveform of regulation during this device is not only exportable to be satisfied " wind energy turbine set inserts the power system technology regulation ", and that can set other arbitrarily falls the degree of depth and time, the device own loss is little, can carry out trend and idle researching and analysing; And be whole moveable structure.
For achieving the above object, the utility model is achieved through the following technical solutions:
A kind of multiple-level serially connected voltage falling generator of H bridge based on IGBT, this device can be realized the two-way flow of energy for the energy feedback type four quadrant convertor; Its input is connected with the electrical network ac bus, and output is connected with system under test (SUT); Through feeding switch QF1 power supply, feeding switch QF1 and feeding switch QF2 realize interlocking to this device input by the electrical network ac bus, can not be closed simultaneously; Feeding switch QF2 is connected between electrical network ac bus and the device output, and when the detection system low voltage ride-through capability, this device feeds back to ac bus with the generated energy of system under test (SUT).
Described energy feedback type four quadrant convertor constitutes a phase by the power unit cascade stack frequently of a plurality of low pressure H bridgings, and three-phase Y connects and composes.
Described H bridging power cell rectification frequently side is the controlled full-bridge of IGBT controllable devices three-phase, charges to filter capacitor after rectification; Outlet side is made up of four IGBT controllable devices of inversion.
This device also comprises input reactance device, input circuit breaker, input phase shifting transformer, output transformer, output circuit breaker, out put reactor, is connected to input reactance device, input circuit breaker, input phase shifting transformer between electrical network ac bus and the energy feedback type four quadrant convertor successively; Be connected to output transformer, output circuit breaker, out put reactor between energy feedback type four quadrant convertor and the system under test (SUT) successively.
Described energy feedback type four quadrant convertor, out put reactor and input reactance device, input phase shifting transformer, output transformer and output circuit breaker are loaded on respectively in four containers, are moveable structure.
The output voltage of this device is by the modulation signal decision of controller output, adopt triangular carrier and sinusoidal modulation signal phase of wave to hand over the PWM waveform that obtains directly to control each IGBT and can obtain pulse duration and the variable voltage pulse output that is sinusoidal variations of each interpulse duty ratio, can obtain ideal control effect: the output current near sinusoidal, the waveform overlapped in series of each power cell output produces required voltage waveform.According to required electric voltage dropping wave setting modulation wave signal, can obtain the electric voltage dropping curve that coincidence detection requires.
Compared with prior art, novelty of the present utility model and creativeness are embodied in the following aspects:
1, can simulate various electric network faults, as single-phase to earth fault, two relatively fault, phase-to phase fault, three-phase fault;
2, falling the degree of depth, phase place, time can set, this is that traditional impedance form and transformer form VSG can't the perfect functions that realizes, the electric voltage dropping curve of impedance form and transformer form VSG is unsmooth, the spike that occurs voltage and electric current easily, the electric voltage dropping curve smoothing that VSG of the present utility model produces does not have flex point, it is fast that voltage recovers, and the minimum degree of depth of falling can reach 15%, is better than 20% of national requirements;
3, frequency change can be set, and can set and depart from percentage (5%～+ 5%), the flickering of simulation mains frequency.
4, enough VSG capacity are provided, electric voltage dropping was by 20% o'clock of rated voltage, the overcurrent that wind generator system produces is about more than 3 times of rated current, the situation of VSG appears damaging because of Capacity Selection is improper in traditional impedance form VSG easily, the capacity of VSG of the present utility model is elected 4 times of tested wind generator system as, and enough capacities of short circuit are provided.
5, improved the efficient of system, the energy loss of traditional impedance form VSG is bigger, unfavorablely carries out trend and idle researching and analysing, and the whole efficiency of VSG of the present utility model is beneficial to and carries out trend and idle researching and analysing more than 96%.
6, improved the power factor of system, electric voltage dropping was by 20% o'clock of rated voltage, wind generator system will lose idle regulating power, this moment, the power factor of whole generating system was very low, electrical network is produced bigger influence, VSG of the present utility model can make the power factor of grid side be stabilized in about 0.95, is carrying out can not producing impact to electrical network when low-voltage is passed through detection.
7, VSG equipment feeds back to the electrical network bus with the wind turbine generator generated energy, realizes little energy consumption of " back-to-back " mechanical back to back test.
Description of drawings
Fig. 1 is the overall system view that the utility model device is connected with system under test (SUT);
Fig. 2 is the concrete johning knot composition of the utility model device and system under test (SUT);
Fig. 3 is a waveform overlapped in series schematic diagram;
Fig. 4 is a plurality of frequency conversion power unit overlapped in series schematic diagrames;
Fig. 5 is the topology diagram of energy feedback type four quadrant convertor;
Fig. 6 is the H bridging structure chart of power cell frequently.
Embodiment
See Fig. 1, tested wind generator system is dual feedback wind power generation system and photovoltaic generating system, and this device also can be used for the permanent magnet direct-drive wind generator system based on the multiple-level serially connected voltage falling generator VSG of the H bridge of IGBT.Through feeding switch QF1 power supply, QF1 and QF2 realize interlocking to the VSG device by ac bus, can not be closed simultaneously; When the detection system low voltage ride-through capability, VSG feeds back to ac bus with the generated energy of system under test (SUT), realizes little energy consumption of " back-to-back " mechanical back to back test.
See Fig. 2, this device is made of input reactance device L1, input circuit breaker K1, input phase shifting transformer T1, energy feedback type four quadrant convertor 1, output transformer T2, output circuit breaker K2, out put reactor L2, is connected to input reactance device L1, input circuit breaker K1, input phase shifting transformer T1 between electrical network ac bus and the energy feedback type four quadrant convertor 1 successively; Be connected to output transformer T2, output circuit breaker K2, out put reactor L2 between energy feedback type four quadrant convertor 1 and the system under test (SUT) successively.
Described energy feedback type four quadrant convertor 1, out put reactor L2 and input reactance device L1, input phase shifting transformer T1, output transformer T2 and output circuit breaker K2 are loaded on respectively in four containers, are moveable structure.Be convenient to transportation, install.
See Fig. 4, Fig. 5, described energy feedback type four quadrant convertor constitutes a phase by the power unit cascade stack frequently of a plurality of low pressure H bridgings, and three-phase Y connects and composes.Supply with every phase N IGBT frequency conversion power unit by the three-phase alternating current that electrical network is sent here through phase shifting transformer, the PWM phase of wave poststack of every N that goes up mutually power cell output adopts Y shape to connect, and will form line voltage and be
High-quality sinewave output, supply with tested wind generator system or photovoltaic generating system.
See Fig. 6, described H bridging power cell rectification frequently side is the controlled full-bridge of IGBT controllable devices three-phase, charges to filter capacitor after rectification; Outlet side is made up of four IGBT controllable devices of inversion.
See Fig. 3, the modulation wave signal of the different units of same phase is identical, carrier signal differs a phase place, triangular carrier and sinusoidal modulation signal phase of wave hand over the PWM waveform that obtains directly to control each IGBT can obtain pulse duration and the variable voltage pulse output that is sinusoidal variations of each interpulse duty ratio, and the waveform overlapped in series of each power cell output produces required voltage waveform.According to required electric voltage dropping wave setting modulation wave signal, can obtain the electric voltage dropping curve that coincidence detection requires.
See Fig. 5, H bridging power cell input side frequently is provided with fuse, rectification side IGBT module, capacitor and outlet side inversion side IGBT module, and converter unit control and drive circuit.Each unit main electrical scheme has 5 terminals: wherein 3 are input, and promptly R, S, T link to each other with reactor, accept transformer secondary output output three-phase alternating current.2 terminals are the output after modulating, i.e. U, V in addition.
The rectification side of power cell is the controlled rectification mode, and this mode can make from the energy of crossing of generating pusher side and be transmitted back to electrical network.Frequency conversion power unit is basic AC-DC-AC three phase rectifier/single-phase inversion circuit, and the rectification side is the IGBT three phase full bridge, charges to filter capacitor after rectification; Outlet side is composed in series mutually by the IGBT of inversion, is connected with system under test (SUT).
The secondary winding of phase shifting transformer is divided into many groups, and there is a phase difference mutually in secondary coil, according to electric pressure and frequency conversion power unit progression, generally is made of the rectifier system of multistage phase shift stack tens trains of impulses.
Controller is made of jointly high-speed dsp, industry PC and PLC, adopts optical fiber communication technology between controller and the frequency conversion power unit, and low-pressure section and high-pressure section are reliable fully isolates.
Claims (5)
1. the multiple-level serially connected voltage falling generator of H bridge based on IGBT is characterized in that, this device can be realized the two-way flow of energy for the energy feedback type four quadrant convertor; Its input is connected with the electrical network ac bus, and output is connected with system under test (SUT); Through feeding switch QF1 power supply, feeding switch QF1 and feeding switch QF2 realize interlocking to this device input by the electrical network ac bus, can not be closed simultaneously; Feeding switch QF2 is connected between electrical network ac bus and the device output, and when the detection system low voltage ride-through capability, this device feeds back to ac bus with the generated energy of system under test (SUT).
2. a kind of multiple-level serially connected voltage falling generator of H bridge based on IGBT according to claim 1 is characterized in that, described energy feedback type four quadrant convertor constitutes a phase by the power unit cascade stack frequently of a plurality of low pressure H bridgings, and three-phase Y connects and composes.
3. a kind of multiple-level serially connected voltage falling generator of H bridge based on IGBT according to claim 1 and 2 is characterized in that, described H bridging power cell rectification frequently side is the controlled full-bridge of IGBT controllable devices three-phase, charges to filter capacitor after rectification; Outlet side is made up of four IGBT controllable devices of inversion.
4. a kind of multiple-level serially connected voltage falling generator of H bridge according to claim 1 and 2 based on IGBT, it is characterized in that, this device also comprises input reactance device, input circuit breaker, input phase shifting transformer, output transformer, output circuit breaker, out put reactor, is connected to input reactance device, input circuit breaker, input phase shifting transformer between electrical network ac bus and the energy feedback type four quadrant convertor successively; Be connected to output transformer, output circuit breaker, out put reactor between energy feedback type four quadrant convertor and the system under test (SUT) successively.
5. a kind of multiple-level serially connected voltage falling generator of H bridge according to claim 4 based on IGBT, it is characterized in that, described energy feedback type four quadrant convertor, out put reactor and input reactance device, input phase shifting transformer, output transformer and output circuit breaker are loaded on respectively in four containers, are moveable structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200682248U CN202034907U (en) | 2011-03-15 | 2011-03-15 | H bridge serial connection multilevel voltage sag generator based on IGBT |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011200682248U CN202034907U (en) | 2011-03-15 | 2011-03-15 | H bridge serial connection multilevel voltage sag generator based on IGBT |
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| CN202034907U true CN202034907U (en) | 2011-11-09 |
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| CN2011200682248U Expired - Lifetime CN202034907U (en) | 2011-03-15 | 2011-03-15 | H bridge serial connection multilevel voltage sag generator based on IGBT |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102158101A (en) * | 2011-03-15 | 2011-08-17 | 荣信电力电子股份有限公司 | H-bridge cascaded multilevel voltage sag generator based on insulated gate bipolar transistor (IGBT) |
| CN102904458A (en) * | 2012-11-08 | 2013-01-30 | 南车株洲电力机车研究所有限公司 | Voltage sag generation device and control method and device for inverter |
| CN103064023A (en) * | 2012-12-26 | 2013-04-24 | 北京荣华恒信开关技术有限公司 | Grid-tied testing device for wind electricity and photovoltaic energy and testing method thereof |
-
2011
- 2011-03-15 CN CN2011200682248U patent/CN202034907U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102158101A (en) * | 2011-03-15 | 2011-08-17 | 荣信电力电子股份有限公司 | H-bridge cascaded multilevel voltage sag generator based on insulated gate bipolar transistor (IGBT) |
| CN102158101B (en) * | 2011-03-15 | 2013-09-25 | 荣信电力电子股份有限公司 | H-bridge cascaded multilevel voltage sag generator based on insulated gate bipolar transistor (IGBT) |
| CN102904458A (en) * | 2012-11-08 | 2013-01-30 | 南车株洲电力机车研究所有限公司 | Voltage sag generation device and control method and device for inverter |
| CN102904458B (en) * | 2012-11-08 | 2015-01-28 | 南车株洲电力机车研究所有限公司 | Control method and device for inverter |
| CN103064023A (en) * | 2012-12-26 | 2013-04-24 | 北京荣华恒信开关技术有限公司 | Grid-tied testing device for wind electricity and photovoltaic energy and testing method thereof |
| CN103064023B (en) * | 2012-12-26 | 2015-10-14 | 北京荣华恒信开关技术有限公司 | For grid-connected proving installation and the method for testing thereof of wind-powered electricity generation and photovoltaic |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20111109 Effective date of abandoning: 20130925 |
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| RGAV | Abandon patent right to avoid regrant |