CN204030971U - The power cell with bypass functionality of unit series connection type high voltage frequency convertor - Google Patents
The power cell with bypass functionality of unit series connection type high voltage frequency convertor Download PDFInfo
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- CN204030971U CN204030971U CN201420478456.4U CN201420478456U CN204030971U CN 204030971 U CN204030971 U CN 204030971U CN 201420478456 U CN201420478456 U CN 201420478456U CN 204030971 U CN204030971 U CN 204030971U
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Abstract
The utility model provides a kind of power cell with bypass functionality of unit series connection type high voltage frequency convertor, comprises input fuse, rectifier bridge, the first filter circuit, H inverter bridge, bypass circuit, unit controls plate and Bypass Control plate; Described unit controls plate comprises the first switching power circuit and double loop power supply control circuit; Described Bypass Control plate comprises the second switch power circuit by the three-phase alternating current supplying power for input end of described power cell; Described two-way control power circuit comprises the first input end that connects respectively the first switching power circuit output and the second input that is connected second switch power circuit output end, and in the time that first input end voltage is less than the second input, will obtains input current via first input end and be switched to via the second input acquisition input current.The beneficial effects of the utility model are that, under various failure conditions, trouble unit is excised in bypass that all can be safe and reliable.
Description
Technical field
The utility model relates to electric and electronic technical field, more particularly, relates to a kind of power cell with bypass functionality of unit series connection type high voltage frequency convertor.
Background technology
The main topology of present stage high voltage converter generally adopts power unit cascade technology, has that harmonic wave is little, unit is interchangeable, can be mass, the advantage such as easy to maintenance.But in above-mentioned high voltage converter, if some or several power cells break down in running, to cause whole frequency converter cisco unity malfunction, even high-voltage trip, the reliability of high voltage converter is reduced, bring great hidden danger to production safety, brought immeasurable economic loss to user.In order to improve reliability and the fail safe of high voltage converter, the general power unit by-pass device that adopts, in the time that power cell breaks down, can be effectively by the power cell excision of fault, adjust fault-free power cell operating state, make high voltage converter can continue operation.
The power unit by-pass mode of existing high voltage converter mainly contains following several:
The first is to be made up of diode rectifier bridge and thyristor, as shown in Figure 1, the ac input end of diode rectifier bridge is connected with power cell output, the control power supply of thyristor is provided by unit controls plate, the input power of unit controls plate draws from unit DC bus, produce again the control power supply of thyristor through the switching power circuit modulation on unit controls plate, to control the conducting of thyristor and to close.In the time that unit breaks down, unit controls plate sends control signal and blocks the driving pulse of inverter bridge, triggers the by-pass mistake that phase current that thyristor makes place, unit phase forms through diode rectifier bridge and thyristor simultaneously, and now trouble unit is bypassed excision.But in the time that bypass functionality moves, thyristor can bear the dv/dt that exceedes its tolerance, easily causes it to mislead, cause the short trouble of power cell; When be there is the unit controls plate power failure situation that input fuse damages, rectifier bridge damages or other faults cause by power cell, all can not realize in addition the bypass functionality of power cell.
The second is to be made up of the IGBT of two docking (insulated gate bipolar transistor), as shown in Figure 2, the upper and lower two-terminal of IGBT of two docking is connected with unit output, the control power supply of IGBT is provided by unit controls plate, the input power of unit controls plate draws from unit DC bus, produce again the control power supply of IGBT through the switching power circuit modulation on unit controls plate, to control the conducting of IGBT and to close.In the time that unit breaks down, unit controls plate sends control signal and blocks the driving pulse of inverter bridge, controls the IGBT conducting of two docking simultaneously, and now trouble unit is bypassed excision.Its shortcoming is when be there is the unit controls plate power failure situation that input fuse damages, rectifier bridge damages or other faults cause by power cell, all to realize the bypass functionality of power cell.
The third is to be made up of bypass contactor, as shown in Figure 3, the Chang Kaiduan of bypass contactor is connected with unit output respectively with normal-closed end, and bypass contactor, by the control of centralized control plate, produces the control circuit of all power unit by-pass contactors by an independently bypass centralized control plate.In the time that power cell breaks down, unit controls plate sends control signal and blocks the driving pulse of inverter bridge, and the centralized control of bypass simultaneously plate control bypass contactor coil switch power, discharges its normally-closed contact, adhesive normally opened contact, now trouble unit is bypassed excision.But need very high dielectric voltage withstand (to be equivalent to main circuit of frequency converter output voltage grade between contacts of contactor in which and coil, as 10KV), need to use particular design or enter the contactor (such as add insulating bar between contact and propelling coil) of repacking, cost is very high, and reliability reduces.The control number of cables of bypass contactor is many in addition, causes machine routing complex process, and Bypass Control power supply also only has a road, and reliability is low.
The 4th kind is to be made up of bypass contactor, as shown in Figure 4, bypass contactor often open and normally closed terminal is connected with unit output respectively, the control circuit of bypass contactor is provided separately by each power cell, each power cell has independently bypass contactor control circuit, it is controlled power supply and takes from respectively the DC bus of each power cell, then modulates the control power supply that produces bypass contactor through switching power circuit.In the time that unit breaks down, unit controls plate sends control signal and blocks the driving pulse of inverter bridge, and control contactor coil switch power simultaneously, discharges normally-closed contact, adhesive normally opened contact, and now trouble unit is bypassed excision.Its shortcoming is when the bypass functionality that is occurred all can not realizing in the unit controls plate power failure situation that input fuse damages, rectifier bridge damages or other faults cause power cell by power cell.
Utility model content
The technical problems to be solved in the utility model is, for above-mentioned shortcoming of the prior art, a kind of power cell with bypass functionality of unit series high-voltage frequency converter is provided, under various failure conditions, all trouble unit is excised in bypass safely and reliably, and elimination system under some fault can not realize the hidden danger of power unit by-pass function.
The utility model solves the technical scheme that its technical problem adopts: a kind of power cell with bypass functionality of unit series connection type high voltage frequency convertor, comprise H inverter bridge, bypass circuit, unit controls plate and Bypass Control plate, wherein said unit controls plate unit sends the signal that blocks H inverter bridge and the signal that makes bypass circuit work in the time that power cell breaks down, it is characterized in that: described unit controls plate comprises by the first DC bus powered switching power circuit of power cell and is the double loop power supply control circuit with electrical component power supply on described unit controls plate and described Bypass Control plate, described Bypass Control plate comprises the second switch power circuit by the three-phase alternating current supplying power for input end of described power cell, described two-way control power circuit comprises the first input end that connects respectively the first switching power circuit output and the second input that is connected second switch power circuit output end, and in the time that first input end voltage is less than the second input, will obtains input current via first input end and be switched to via the second input acquisition input current.
In the power cell with bypass functionality of said units series type high-voltage frequency converter, described two-way control power circuit also comprises that the first diode, voltage adjuster, described the second input connect the anode of described the first diode, and the negative electrode of described the first diode, described first input end are connected to respectively the input of described voltage adjuster.
In the power cell with bypass functionality of said units series type high-voltage frequency converter, described two-way control power circuit also comprises the first filter capacitor and the second filter capacitor, wherein: described the first filter capacitor is connected to the input of voltage adjuster and with reference between ground, described the second filter capacitor is connected to the output of voltage adjuster and with reference between ground.
In the power cell with bypass functionality of said units series type high-voltage frequency converter, the output voltage of described the first switching power circuit is higher than the output voltage of second switch power circuit.
In the power cell with bypass functionality of said units series type high-voltage frequency converter, described Bypass Control plate also comprises rectification circuit, the second filter circuit, on Bypass Control plate, the three-phase alternating current input of described power cell is connected to described second switch power circuit via described rectification circuit and described the second filter circuit.
In the power cell with bypass functionality of said units series type high-voltage frequency converter, described bypass circuit can be bypass contactor, or the IGBT of two docking.
In the power cell with bypass functionality of said units series type high-voltage frequency converter, described unit controls plate and described Bypass Control plate are positioned at different printed circuit board (PCB)s.
In the power cell with bypass functionality of said units series type high-voltage frequency converter, described unit controls plate and described Bypass Control plate are integrated into same printed circuit board (PCB).
The beneficial effects of the utility model are: under various failure conditions, all trouble unit is excised in bypass safely and reliably, and elimination system under some fault can not realize the hidden danger of power unit by-pass function.
Brief description of the drawings
Fig. 1 is the circuit diagram of the first power unit by-pass mode of the prior art.
Fig. 2 is the circuit diagram of the second power unit by-pass mode of the prior art.
Fig. 3 is the circuit diagram of the third power unit by-pass mode of the prior art.
Fig. 4 is the circuit diagram of the 4th kind of power unit by-pass mode of the prior art.
Fig. 5 is the electrical block diagram of the power cell with bypass functionality of series type high-voltage frequency converter of the present utility model.
Fig. 6 is the unit controls plate of the power cell in Fig. 5 and the circuit schematic block diagram of Bypass Control plate.
Fig. 7 is the circuit diagram of the two-way control power circuit in Fig. 6.
Fig. 8 is the circuit diagram of the power cell with bypass functionality of the series type high-voltage frequency converter of the utility model the first embodiment.
Fig. 9 is the circuit diagram of the power cell with bypass functionality of the series type high-voltage frequency converter of the utility model the second embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
As shown in Figure 5, the electrical block diagram of the power cell with bypass functionality of series type high-voltage frequency converter of the present utility model.The power cell 500 of series type high-voltage frequency converter comprises input fuse 501, rectifier bridge 502, the first filter circuit 503, H inverter bridge 504, bypass circuit 505, unit controls plate 506 and Bypass Control plate 507.
Particularly, the ac input end R/S/T of power cell 500 connects through input fuse 1 (current-limiting protection) rectifier bridge 502 being constituted by a diode, and forms Rectified alternating current; The DC power supply of the first filter circuit 503 being made up of filter capacitor and resistance is taken from the input power of DC bus DC+/DC-, and connects rectifier bridge 502, and Rectified alternating current is carried out to filtering; H inverter bridge 504 connects the first filter circuit 503, for this direct current being converted to all adjustable alternating voltages of frequency, amplitude and phase place; Bypass circuit 505 connects the ac output end T1/T2 of H inverter bridge 504, for in the time that described power cell breaks down, the working signal of the described bypass circuit sending according to described unit controls plate, and by the connection of bypass circuit described in the control of described Bypass Control plate, bypass excision trouble unit; The input power of unit controls plate 506 is taken from the input power of the DC bus DC+/DC-of power cell, for H inverter bridge and Bypass Control plate are controlled; The input power of Bypass Control plate 507 is taken from the three-phase alternating current input R/S/T of power cell, for bypass circuit is controlled.
As shown in Figure 6, the unit controls plate of the power cell in Fig. 5 and the circuit schematic block diagram of Bypass Control plate.Unit controls plate 506 comprises the first switching power circuit, CPLD control circuit, IGBT drive circuit, signal deteching circuit, two-way control power circuit.The input power of unit controls plate is taken from the input power of the DC bus DC+/DC-of power cell, and produces the unit controls plate power supply (as+9V) of low pressure through the modulation of the first switching power circuit.
Bypass Control plate 507 comprises rectification circuit, the second filter circuit, second switch power circuit, bypass control circuit.The input power of Bypass Control plate is taken from the three-phase alternating current input R/S/T of power cell, and produces the Bypass Control plate power supply (as+8V) of low pressure through the modulation of rectification circuit, the second filter circuit, second switch power circuit.
As shown in Figure 7, the circuit diagram of the two-way control power circuit in Fig. 6.Two-way control power circuit 700 comprises first input end In1, the second input In2, the first diode D1, voltage adjuster 701, the first filter capacitor C1 and the second filter capacitor C2; Described the second input In2 connects the anode of described the first diode D1, and the negative electrode of described the first diode D1, described first input end In1 are connected to respectively the input of described voltage adjuster 701; Described the first filter capacitor C1 be connected to the input of described voltage adjuster 701 and with reference between ground, described the second filter capacitor C2 be connected to the output of described voltage adjuster 701 and with reference between ground, the earth terminal of described voltage adjuster 701 connects with reference to ground; The node of the output of described voltage adjuster 701 and described the second filter capacitor C2 is as the output of two-way control power circuit 700, and the described control power supply of stable output (as+5V).
Wherein, first input end In1 input unit control board power supply; The second input In2 input Bypass Control plate power supply.
Describe process and the principle of power cell of the present utility model energy bypass excision trouble unit under various failure conditions below in detail.
In two-way control power circuit, the magnitude of voltage of Bypass Control plate power supply is lower than the magnitude of voltage of unit controls plate power supply, the the first diode D1 connecting between the second input In2 and the input of described voltage adjuster 701 plays reverse blocking effect, ensure in the time that unit controls plate power supply normally moves, the control power supply of power cell is provided by unit controls plate power supply, and Bypass Control plate power supply is as hot standby state.When in the time that unit controls plate power supply normally moves, now power cell breaks down, and unit controls plate sends control signal and blocks the driving pulse of H inverter bridge, and sends the working signal of bypass circuit, controls the connection of bypass circuit, bypass excision trouble unit.
Damage when be there is input fuse by power cell, rectifier bridge damages, or other faults cause unit controls plate power failure time, the magnitude of voltage of unit controls plate power supply is by the magnitude of voltage lower than Bypass Control plate power supply, Bypass Control plate power supply is through the first diode D1, the control power supply of stable power cell is provided after voltage adjuster 701 modulation, will replace unit controls plate power supply to provide stable control power supply by voltage adjuster 701 by Bypass Control plate power supply, make all control circuit work, realize the bypass functionality of power cell, and then the excision of bypass safely and reliably trouble unit.
As shown in Figure 8, the circuit diagram of the power cell with bypass functionality of the series type high-voltage frequency converter of the utility model the first embodiment.The power cell 800 of series type high-voltage frequency converter comprises input fuse 801, rectifier bridge 802, the first filter circuit 803, H inverter bridge 804, bypass contactor 805, unit controls plate 806 and Bypass Control plate 807.
Particularly, the ac input end R/S/T of power cell 800 connects through input fuse 801 (current-limiting protection) rectifier bridge 802 being constituted by a diode, and forms Rectified alternating current; The DC power supply of the first filter circuit 803 being made up of filter capacitor and resistance is taken from the input power of DC bus DC+/DC-, and connects rectifier bridge 802, and Rectified alternating current is carried out to filtering; H inverter bridge 804 connects the first filter circuit 803, for this direct current being converted to all adjustable alternating voltages of frequency, amplitude and phase place; Bypass contactor 805 connects the ac output end T1/T2 of H inverter bridge 804, for in the time that described power cell breaks down, the working signal of the described bypass contactor sending according to described unit controls plate, and by the connection of bypass contactor described in the control of described Bypass Control plate, bypass excision trouble unit; The input power of unit controls plate 806 is taken from the input power of the DC bus DC+/DC-of power cell, for H inverter bridge and Bypass Control plate are controlled; The input power of Bypass Control plate 807 is taken from the three-phase alternating current input R/S/T of power cell, for bypass contactor is controlled.
The physical circuit block diagram of unit controls plate and Bypass Control plate, the circuit diagram of two-way control power supply and process and the principle of the present embodiment are described in detail hereinbefore, in order to save space, do not repeat them here, wherein, in the time that power cell 800 breaks down, unit controls plate 807 sends the working signal of bypass contactor 805, controls bypass contactor coil switch power, discharges its normally-closed contact, adhesive normally opened contact, excises bypass the power cell of this fault.
As shown in Figure 9, the circuit diagram of the power cell with bypass functionality of the series type high-voltage frequency converter of the utility model the second embodiment.The power cell 900 of series type high-voltage frequency converter comprises IGBT905, unit controls plate 906 and the Bypass Control plate 907 of input fuse 901, rectifier bridge 902, the first filter circuit 903, H inverter bridge 904, two docking.
Particularly, the ac input end R/S/T of power cell 900 connects through input fuse 901 (current-limiting protection) rectifier bridge 902 being constituted by a diode, and forms Rectified alternating current; The DC power supply of the first filter circuit 903 being made up of filter capacitor and resistance is taken from the input power of DC bus DC+/DC-, and connects rectifier bridge 2, and Rectified alternating current is carried out to filtering; H inverter bridge 904 connects the first filter circuit 903, for this direct current being converted to all adjustable alternating voltages of frequency, amplitude and phase place; The IGBT905 of two docking connects the ac output end T1/T2 of H inverter bridge 904 in the time that described power cell breaks down, the working signal of the IGBT of described two docking of sending according to described unit controls plate, and the connection of IGBT by two docking described in the control of described Bypass Control plate, bypass excision trouble unit; The input power of unit controls plate 906 is taken from the input power of the DC bus DC+/DC-of power cell 900, for H inverter bridge and Bypass Control plate are controlled; The input power of Bypass Control plate 907 is taken from the three-phase alternating current input R/S/T of power cell 900, for the IGBT of two docking is controlled.
The physical circuit block diagram of unit controls plate and Bypass Control plate, the circuit diagram of two-way control power supply and process and the principle of the present embodiment are described in detail hereinbefore, in order to save space, do not repeat them here, wherein, in the time that power cell 900 breaks down, unit controls plate 907 sends the working signal of the IGBT905 of two docking, control the IGBT905 conducting of two docking, bypass is excised to the power cell of this fault.
In the power cell with bypass functionality of above-mentioned series type high-voltage frequency converter, described bypass circuit also can adopt other can realize the electronic device that described bypass circuit is connected.
, in the power cell with bypass functionality of above-mentioned series type high-voltage frequency converter, adopting under the circuit conditions of identical function meanwhile, also unit controls plate and Bypass Control plate can merged into a control board and realize, on same printed circuit board (PCB), realizing.
The above; it is only preferably embodiment of the utility model; but protection range of the present utility model is not limited to this; any be familiar with those skilled in the art the utility model disclose technical scope in; the variation that can expect easily or replacement, within all should being encompassed in protection range of the present utility model.Therefore, protection range of the present utility model should be as the criterion with the protection range of claim.
Claims (8)
1. the power cell with bypass functionality of a unit series connection type high voltage frequency convertor, comprise H inverter bridge, bypass circuit, unit controls plate and Bypass Control plate, wherein said unit controls plate sends the signal that blocks H inverter bridge and the signal that makes bypass circuit work in the time that power cell breaks down, and it is characterized in that: described unit controls plate comprises by the first DC bus powered switching power circuit of power cell and is the double loop power supply control circuit with electrical component power supply on described unit controls plate and described Bypass Control plate; Described Bypass Control plate comprises the second switch power circuit by the three-phase alternating current supplying power for input end of described power cell; Described two-way control power circuit comprises the first input end that connects respectively the first switching power circuit output and the second input that is connected second switch power circuit output end, and in the time that first input end voltage is less than the second input, will obtains input current via first input end and be switched to via the second input acquisition input current.
2. the power cell with bypass functionality of a kind of unit series connection type high voltage frequency convertor according to claim 1, it is characterized in that, described two-way control power circuit also comprises that the first diode, voltage adjuster, described the second input connect the anode of described the first diode, and the negative electrode of described the first diode, described first input end are connected to respectively the input of described voltage adjuster.
3. the power cell with bypass functionality of a kind of unit series connection type high voltage frequency convertor according to claim 1, it is characterized in that, described two-way control power circuit also comprises the first filter capacitor and the second filter capacitor, wherein: described the first filter capacitor is connected to the input of voltage adjuster and with reference between ground, described the second filter capacitor is connected to the output of voltage adjuster and with reference between ground.
4. the power cell with bypass functionality of a kind of unit series connection type high voltage frequency convertor according to claim 1, is characterized in that, the output voltage of described the first switching power circuit is higher than the output voltage of second switch power circuit.
5. the power cell with bypass functionality of a kind of unit series connection type high voltage frequency convertor according to claim 1, it is characterized in that, described Bypass Control plate also comprises rectification circuit, the second filter circuit, and the three-phase alternating current input of power cell is connected to described second switch power circuit via described rectification circuit and the second filter circuit.
6. according to the power cell with bypass functionality of arbitrary described a kind of unit series connection type high voltage frequency convertor in claim 1 to 5, it is characterized in that, described bypass circuit is bypass contactor, or the IGBT of two docking.
7. according to the power cell with bypass functionality of arbitrary described a kind of unit series connection type high voltage frequency convertor in claim 1 to 5, it is characterized in that, described unit controls plate and described Bypass Control plate are positioned at different printed circuit board (PCB)s.
8. according to the power cell with bypass functionality of arbitrary described a kind of unit series connection type high voltage frequency convertor in claim 1 to 5, it is characterized in that, described unit controls plate and described Bypass Control plate are integrated into same printed circuit board (PCB).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420478456.4U CN204030971U (en) | 2014-08-22 | 2014-08-22 | The power cell with bypass functionality of unit series connection type high voltage frequency convertor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420478456.4U CN204030971U (en) | 2014-08-22 | 2014-08-22 | The power cell with bypass functionality of unit series connection type high voltage frequency convertor |
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| CN204030971U true CN204030971U (en) | 2014-12-17 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105406457A (en) * | 2015-12-23 | 2016-03-16 | 辽宁荣信电气传动技术有限责任公司 | Two-circuit power supply high-voltage frequency converter unit bypass device based on thyristor |
| CN106849634A (en) * | 2017-03-14 | 2017-06-13 | 特变电工新疆新能源股份有限公司 | A kind of bypass circuit |
| CN107086797A (en) * | 2017-05-04 | 2017-08-22 | 广州供电局有限公司 | Power model |
-
2014
- 2014-08-22 CN CN201420478456.4U patent/CN204030971U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105406457A (en) * | 2015-12-23 | 2016-03-16 | 辽宁荣信电气传动技术有限责任公司 | Two-circuit power supply high-voltage frequency converter unit bypass device based on thyristor |
| CN106849634A (en) * | 2017-03-14 | 2017-06-13 | 特变电工新疆新能源股份有限公司 | A kind of bypass circuit |
| CN107086797A (en) * | 2017-05-04 | 2017-08-22 | 广州供电局有限公司 | Power model |
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