CN203537247U - Universal control circuit board of multi-level converter - Google Patents
Universal control circuit board of multi-level converter Download PDFInfo
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- CN203537247U CN203537247U CN201320721612.0U CN201320721612U CN203537247U CN 203537247 U CN203537247 U CN 203537247U CN 201320721612 U CN201320721612 U CN 201320721612U CN 203537247 U CN203537247 U CN 203537247U
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Abstract
The utility model discloses a universal control circuit board of a multi-level converter. The universal control circuit board is suitable for being applied to multi-level structures such as an H-bridge-type cascade multi-level converter and a modularized multi-level converter in occasions with middle and high voltages. The universal control circuit board comprises a main control board and a plurality of driving expansion boards, which are connected with the main control board through optical fibers. Electrical isolation of the main control board and the driving expansion boards is achieved through the optical fibers, so that electromagnetic interferences for a pulse signal in a transmission process are avoided, and good control accuracy and expandability are achieved, which are beneficial for applying the multi-level converter in occasions with middle and high voltages.
Description
Technical field
The utility model relates to the multi-level converter in electric power system, and a kind of universal multi-level converter control circuit board is particularly applicable to be applied in many level structures such as the H bridge cascade multi-level converter of mesohigh occasion and modular multilevel converter.
Background technology
In recent years, along with the development of the direct current transportation in electric power system, reactive power compensation, active power filter and the application demand of high-power occasion, multi-level converter has obtained increasing attention, wherein H bridge cascade multi-level converter adopts the series connection of a plurality of H bridges unit to solve the withstand voltage and capacity limit of switching device, and each module is identical, be easy to modularization and assembling, can reduce switch stress, improve output voltage waveforms, adopt advanced and mature pulse width modulation (PWM) technology can effectively suppress and eliminate low-order harmonic.Therefore, H bridge cascade multi-level converter has obtained paying attention to widely.Simultaneously, easily the advantage such as expansion and modularized design is extensively concerned with it for modular multilevel converter, can realize the electric energy exchange under voltage levels, different from H bridge cascade multi-level converter is, it has public direct-current side, makes it be more applicable for back-to-back system (CCC-0) and HVDC Light.Above two kinds of multi-level converters have obtained increasing concern in the application of electric power system.
Multi-level converter switching device is many, and sampled signal and control signal are many, and the DC side of need to sampling signal, is unfavorable for being applied to mesohigh occasion, also there is no at present the control circuit board for multi-level converter.
Summary of the invention
Technical problem to be solved in the utility model is, not enough for prior art, and a kind of universal multi-level converter control circuit board with good control precision and extensibility is provided, and for multi-level converter is applied to mesohigh occasion, facilitates.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is: a kind of universal multi-level converter control circuit board, comprises the driving expansion board that master board is communicated by letter with described master board by optical fiber with polylith; Described master board comprises DSP, the FPGA being connected with described DSP, A/D sampling module; Described A/D sampling module presses modular converter to be connected with frequency; Described frequency presses modular converter successively by the electrooptic conversion module of overvoltage protective module, the comprehensive module of fault-signal, hardware protection module access output pwm signal and locking signal; Described FPGA accesses the electrooptic conversion module of described output pwm signal and locking signal by pwm signal sending module; Described DSP accesses the comprehensive module of described fault-signal; Described frequency presses modular converter, the comprehensive module of fault-signal to be connected with d. c. voltage signal photoelectric conversion module, fault-signal photoelectric conversion module respectively; Described driving expansion board comprises bleeder circuit, the voltage-frequency modular converter being connected with described bleeder circuit, fault-signal sending module, for receiving the photoelectric conversion module of pwm signal, for receiving the photoelectric conversion module of locking signal; Described voltage-frequency modular converter, fault-signal sending module are connected with the electrooptic conversion module of output dc voltage signal, the electrooptic conversion module of output fault-signal respectively.
In described master board, be also provided with the A/D Sampling Interface that is connected with described A/D sampling module, with the two-way serial communication modular being connected of described DSP, the zero cross detection circuit being connected with described DSP, a plurality of reserved expansion mouthful; In described driving expansion board, be also provided with the DC voltage interface that is connected with described bleeder circuit and with described fault-signal sending module, for receive pwm signal photoelectric conversion module, for receiving the switching device that the photoelectric conversion module of locking signal is connected, drive interface.Various interface is with good expansibility circuit board of the present utility model.
The electrooptic conversion module of the electrooptic conversion module of the electrooptic conversion module of described output pwm signal and locking signal, output dc voltage signal, output fault-signal all adopts HFBR-1412 electrical to optical converter; D. c. voltage signal photoelectric conversion module, fault-signal photoelectric conversion module, for receive pwm signal photoelectric conversion module, for receiving the photoelectric conversion module of locking signal, all adopt HFBR-2412 optical-electrical converter; Described voltage-frequency modular converter, frequency press modular converter all to adopt LM331 chip; Described pwm signal sending module adopts SN7407 chip; Described fault-signal sending module comprises for the CD4069 chip of receiving key device fault signal, the CD4071 chip being connected with described CD4069 chip, the triode that is connected with described CD4071 chip; Described overvoltage crowbar comprises LM393 comparator, TLP521 isolator, CD4069 chip, the CD4071 chip connecting successively; The comprehensive module of described fault-signal comprises the CD4071 chip of CD4013 latch and two series connection, and wherein a CD4071 chip is connected with described CD4013 latch; Described hardware protection circuit comprises CD4069 chip and the TIL113 optical coupling isolator, the triode that are connected with described CD4069 chip, and described TIL113 optical coupling isolator is in parallel with described triode.
DSP adopts fixed point type TMS320F2812 DSP, and fpga chip adopts Cyclone II family chip EP2C5Q208.
Compared with prior art, the beneficial effect that the utility model has is: the utility model master board and driving expansion board realize electrical isolation by optical fiber, avoided the electromagnetic interference of pulse signal in transmitting procedure, sampling is mainly born in master board, protection, the task such as issue of trigger impulse, drive expansion board mainly to complete the opto-electronic conversion of pulse signal, the conversion of DC voltage signal and transmission, and the transmission of module failure signal, for multi-level converter sampled signal and the many features of control signal, this control circuit board provides the output interface of extendible A/D Sampling Interface and multi-channel PWM signal, make the more extensive and flexibility of its application, dsp chip adopts fixed point type TMS320F2812 DSP, fpga chip adopts Cyclone II family chip EP2C5Q208, take full advantage of DSP computational speed fast, low in energy consumption, cost performance advantages of higher, when add IQmath library file in software systems after, can carry out floating-point operation, greatly simplify calculation procedure, and FPGA have numerous can software the I/O mouth of configuration and outstanding parallel processing capability, DSP and FPGA cooperatively interact, make DSP more be absorbed in signal real-time sampling and computing, and FPGA bring into play its parallel processing capability generation multi-channel PWM starting signal, has greatly improved system effectiveness, this control circuit board has extended out the high-precision A/D conversion chip AD7656 of several pieces ADI companies flexibly, its low noise, wide bandwidth, high precision performance has been simplified the design of signal conditioning circuit, and provide parallel, serial and daisy chain interface modes, as required flexible configuration, this control circuit board utilizes opto-electronic conversion, electric light conversion to be connected the master board of low potential side and the driving expansion board of hot side with multimode fiber, realized pwm control signal, the transmission of status signal etc., utilize voltage-frequency conversion simultaneously and frequently press conversion to realize the isolation sampling of multi-level converter DC voltage, really realized the electrical isolation of hot side and low potential side, the safety and reliability that has improved device, is conducive to multi-level converter in the application of mesohigh occasion, the error protection module of the switching device that this control circuit board has comprised multi-level converter, hardware logic protection, has improved its adaptibility to response and reliability under failure condition.
Accompanying drawing explanation
Fig. 1 is the utility model one example structure figure;
Fig. 2 is H bridge cascade multi-level converter main circuit diagram;
Fig. 3 is zero cross detection circuit schematic diagram;
Fig. 4 is AD7656 and TMS320F2812 interface schematic diagram;
Fig. 5 is electric light transfer principle figure;
Fig. 6 is photoelectricity transformation principle figure;
Fig. 7 is DC voltage isolation sampling block diagram;
Fig. 8 voltage frequency conversioning circuit figure;
Fig. 9 frequency-voltage conversion circuit figure;
Figure 10 is FPGA and dsp interface schematic diagram;
Figure 11 is pwm signal sending module schematic diagram;
Figure 12 is fault signal transmitting module block diagram;
Figure 13 is overvoltage protective module block diagram;
Figure 14 is fault signal synthesis module frame chart;
Figure 15 hardware protection circuit block diagram.
Embodiment
As Fig. 1, the utility model one embodiment comprises the driving expansion board that master board is communicated by letter with described master board by optical fiber with polylith; Described master board comprises DSP, the FPGA being connected with described DSP, A/D sampling module; Described A/D sampling module presses modular converter to be connected with frequency; Described frequency presses modular converter successively by the electrooptic conversion module of overvoltage protective module, the comprehensive module of fault-signal, hardware protection module access output pwm signal and locking signal; Described FPGA accesses the electrooptic conversion module of described output pwm signal and locking signal by pwm signal sending module; Described DSP accesses the comprehensive module of described fault-signal; Described frequency presses modular converter, the comprehensive module of fault-signal to be connected with d. c. voltage signal photoelectric conversion module, fault-signal photoelectric conversion module respectively; Described driving expansion board comprises bleeder circuit, the voltage-frequency modular converter being connected with described bleeder circuit, fault-signal sending module, for receiving the photoelectric conversion module of pwm signal, for receiving the photoelectric conversion module of locking signal; Described voltage-frequency modular converter, fault-signal sending module are connected with the electrooptic conversion module of output dc voltage signal, the electrooptic conversion module of output fault-signal respectively.
Below in conjunction with accompanying drawing, take H bridge cascade multi-level converter is described further the utility model as example as reactive-load compensator.
H bridge cascade multi-level converter structure as shown in Figure 2, H bridge cascade multi-level converter is connected with electrical network by linked reactor, by changing amplitude and the phase place of multi-level converter AC output voltage, can be just that this converter absorbs or sends the reactive current meeting the demands, thereby realize the object of dynamic passive compensation.Control circuit board, by sampling output current signal and receipts or other documents in duplicate at different levels unit DC voltage signal, through the computing of a series of control algolithms, is finally realized the control to multi-level converter DC voltage and output reactive current.
Fig. 2 is H bridge cascade multi-level converter main circuit diagram, take every unit cascaded by two H bridges be example, three-phase system has 6 H bridge unit, while adopting control circuit board described in the utility model, whole control system consists of a master board and 6 driving expansion board, and each H bridge unit need be equipped with one and drive expansion board.By functional module, introduce the utility model control circuit board each several part operation principle below.
(1) zero cross detection circuit
As shown in Figure 3, zero cross detection circuit is realized the catching of line voltage zero passage, both can detection of grid phase voltage zero crossing, also can detection line voltage over zero, and the effect of this part is mainly to provide a synchronizing signal to whole control system.Line voltage through voltage transformer by RC filter filtering high-frequency harmonic, again through anti-paralleled diode D1, D2 amplitude limit, be connected to the negative input end of comparator LM393, comparator positive input terminal ground connection, DSP external interrupt pin is received in the output of LM393 after pull-up resistor, and the skip signal on DSP detection pin captures the zero crossing of line voltage, considers the disturbance of line voltage, by comparator design, be hysteresis comparator circuit, its hysteresis is determined by R2 and R3.In order to make up by RC filter and the sluggish phase place relatively causing, to lag behind and can in DSP control program, add phase compensation to proofread and correct.
(2) A/D sampling module
This module mainly realizes the sampling to ac-side current and multi-level converter DC voltage, feature for multi-level converter sampled signal, this module can be expanded several pieces AD chips AD7656, as shown in Figure 4, the number of signals that can sample as required rationally extends out AD chip to the Interface design of AD7656 and DSP2812.DSP address wire realizes the sheet choosing to AD7656 after decoding circuit, and the BUSY signal of AD chip is sent to DSP after decoding circuit is comprehensive, and DSP output starts switching signal CONVST and starts sampling.AD sampled data is read by the data/address bus of DSP.
(3) electric light conversion, photoelectric conversion module
This two parts module mainly realizes the conversion between the signal of telecommunication and light signal, realizes complete electrical isolation service is provided for hot side and low potential side.Electric light conversion, photoelectric conversion module as shown in accompanying drawing 5, Fig. 6, adopt respectively TX HFBR-1412TZ electrical to optical converter and the RX HFBR-2412TZ optical-electrical converter of U.S. Avago Technologies company respectively.
(4) press/frequency modular converter, frequently/pressure modular converter
Press/modular converter, frequently/pressure modular converter are sampled and design mainly for the submodule DC voltage of multi-level converter frequently.As shown in accompanying drawing 7, Fig. 8, Fig. 9, implementation method is that DC voltage is after precision resistance Ra, Rb dividing potential drop, be met the magnitude of voltage of pressure/frequency modular converter input range, through being converted to of overvoltage/frequency modular converter frequency signal proportional to magnitude of voltage, frequency signal is converted to light signal through electrooptic conversion module again, by multimode fiber, be transferred to master board, master board is converted to the signal of telecommunication by light signal, by frequently pressing modular converter to be reduced to voltage signal, send into AD sampling module and complete DC voltage isolation sampling again.
(5) generation of pwm signal and transmission
FPGA and DSP cooperation complete the generation of pwm signal, DSP generates modulation wave signal, FPGA produces an interruption with certain frequency to DSP, interrupt interim DSP by GPIO mouth by modulating wave data distributing to FPGA, FPGA within it portion produces multichannel triangular signal, and the modulating wave that triangular wave and DSP issue compares and produces multi-channel PWM signal.The Interface design of DSP and FPGA as shown in Figure 10.The sending module of pwm signal as shown in Figure 11, because of FPGA driving force a little less than, be not enough to reliably drive rear class electro-optical conversion circuit, therefore must after SN7407 drives, give again electrooptic conversion module.
(6) fault-signal sending module
This part is positioned at and drives in expansion board, mainly complete the transmission to switch device fault signal, as shown in Figure 12, the fault-signal of switching device is after CD4069 carries out logical transition, through CD4071, carry out the comprehensive of switching device fault again, then by giving electrooptic conversion module after triode 2N5551 power amplification.
(7) protective circuit
Protective circuit mainly comprises overvoltage protective module, the comprehensive module of fault-signal, and hardware protection modules etc., respectively as shown in accompanying drawing 13, Figure 14, Figure 15.Overvoltage protection is for multi-level converter DC voltage protection design, and fault-signal is comprehensively the submodule fault to multi-level converter, and overvoltage signal and DSP output protection signal carry out comprehensively.When DC voltage overvoltage or submodule fault or the protection of DSP output software, hardware protection carries out pwm pulse blockade, output trip signal etc.In master board, by RX HFBR-2412TZ optical-electrical converter, receive respectively the fault-signal that drives expansion board to send.Because fault output fault-signal is an electric pulse, in order accurately to capture this pulse, use latch CD4013 when down pulse arrives, to latch and export one and stablize high level, warp or a door CD4071 carry out logic synthesis and form total switching device fault-signal, this signal and DC side overvoltage protection signal, DSP output protection signal synthesis forms total failare signal, total fault-signal is after logical transition, after triode 2N5551 power amplification, give electrooptic conversion module, by multimode fiber, be transferred to and drive expansion board lockout switch device, simultaneously through the tripping operation of TIL113 photoelectricity isolation rear drive relay.
Claims (10)
1. a universal multi-level converter control circuit board, is characterized in that, comprises the driving expansion board that master board is communicated by letter with described master board by optical fiber with polylith; Described master board comprises DSP, the FPGA being connected with described DSP, A/D sampling module; Described A/D sampling module presses modular converter to be connected with frequency; Described frequency presses modular converter successively by the electrooptic conversion module of overvoltage protective module, the comprehensive module of fault-signal, hardware protection module access output pwm signal and locking signal; Described FPGA accesses the electrooptic conversion module of described output pwm signal and locking signal by pwm signal sending module; Described DSP accesses the comprehensive module of described fault-signal; Described frequency presses modular converter, the comprehensive module of fault-signal to be connected with d. c. voltage signal photoelectric conversion module, fault-signal photoelectric conversion module respectively; Described driving expansion board comprises bleeder circuit, the voltage-frequency modular converter being connected with described bleeder circuit, fault-signal sending module, for receiving the photoelectric conversion module of pwm signal, for receiving the photoelectric conversion module of locking signal; Described voltage-frequency modular converter, fault-signal sending module are connected with the electrooptic conversion module of output dc voltage signal, the electrooptic conversion module of output fault-signal respectively.
2. universal multi-level converter control circuit board according to claim 1, it is characterized in that, in described master board, be also provided with the A/D Sampling Interface that is connected with described A/D sampling module, with the two-way serial communication modular being connected of described DSP, the zero cross detection circuit being connected with described DSP, a plurality of reserved expansion mouthful.
3. universal multi-level converter control circuit board according to claim 1, it is characterized in that, in described driving expansion board, be also provided with the DC voltage interface that is connected with described bleeder circuit and with described fault-signal sending module, for receive pwm signal photoelectric conversion module, for receiving the switching device that the photoelectric conversion module of locking signal is connected, drive interface.
4. according to the universal multi-level converter control circuit board one of claim 1～3 Suo Shu, it is characterized in that, the electrooptic conversion module of the electrooptic conversion module of the electrooptic conversion module of described output pwm signal and locking signal, output dc voltage signal, output fault-signal all adopts HFBR-1412 electrical to optical converter; D. c. voltage signal photoelectric conversion module, fault-signal photoelectric conversion module, for receive pwm signal photoelectric conversion module, for receiving the photoelectric conversion module of locking signal, all adopt HFBR-2412 optical-electrical converter.
5. universal multi-level converter control circuit board according to claim 4, is characterized in that, described voltage-frequency modular converter, frequency press modular converter all to adopt LM331 chip.
6. according to the universal multi-level converter control circuit board one of claim 1～3 Suo Shu, it is characterized in that, described pwm signal sending module adopts SN7407 chip.
7. according to the universal multi-level converter control circuit board one of claim 1～3 Suo Shu, it is characterized in that, described fault-signal sending module comprises for the CD4069 chip of receiving key device fault signal, the CD4071 chip being connected with described CD4069 chip, the triode that is connected with described CD4071 chip.
8. universal multi-level converter control circuit board according to claim 1, is characterized in that, described overvoltage crowbar comprises LM393 comparator, TLP521 isolator, CD4069 chip, the CD4071 chip connecting successively.
9. universal multi-level converter control circuit board according to claim 1, it is characterized in that, the comprehensive module of described fault-signal comprises the CD4071 chip of CD4013 latch and two series connection, and wherein a CD4071 chip is connected with described CD4013 latch.
10. universal multi-level converter control circuit board according to claim 1; it is characterized in that; described hardware protection circuit comprises CD4069 chip and the TIL113 optical coupling isolator, the triode that are connected with described CD4069 chip, and described TIL113 optical coupling isolator is in parallel with described triode.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105094019A (en) * | 2015-08-31 | 2015-11-25 | 广州供电局有限公司 | High-voltage power electronic control device and control method thereof |
| CN105720560A (en) * | 2014-12-03 | 2016-06-29 | 国家电网公司 | Converter three-grade signal protection circuit |
| CN106246586A (en) * | 2016-08-29 | 2016-12-21 | 西安特锐德智能充电科技有限公司 | A kind of DC fan failure detector circuit |
| CN108170052A (en) * | 2017-12-22 | 2018-06-15 | 北京无线电测量研究所 | A kind of expansible digital power control system and method based on FPGA |
| CN108923676A (en) * | 2018-09-04 | 2018-11-30 | 兰州理工大学 | A kind of MMC control system that DSP is combined with CPLD |
| US10218285B2 (en) | 2015-10-19 | 2019-02-26 | Siemens Aktiengesellschaft | Medium voltage hybrid multilevel converter and method for controlling a medium voltage hybrid multilevel converter |
| CN113193776A (en) * | 2021-05-31 | 2021-07-30 | 上海交通大学 | MMC structure based on synchronous handshake protocol and control method |
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2013
- 2013-11-13 CN CN201320721612.0U patent/CN203537247U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105720560A (en) * | 2014-12-03 | 2016-06-29 | 国家电网公司 | Converter three-grade signal protection circuit |
| CN105720560B (en) * | 2014-12-03 | 2018-09-18 | 国家电网公司 | Current transformer three-level signal protects circuit |
| CN105094019A (en) * | 2015-08-31 | 2015-11-25 | 广州供电局有限公司 | High-voltage power electronic control device and control method thereof |
| US10218285B2 (en) | 2015-10-19 | 2019-02-26 | Siemens Aktiengesellschaft | Medium voltage hybrid multilevel converter and method for controlling a medium voltage hybrid multilevel converter |
| CN106246586A (en) * | 2016-08-29 | 2016-12-21 | 西安特锐德智能充电科技有限公司 | A kind of DC fan failure detector circuit |
| CN106246586B (en) * | 2016-08-29 | 2018-04-03 | 西安特锐德智能充电科技有限公司 | A kind of DC fan failure detector circuit |
| CN108170052A (en) * | 2017-12-22 | 2018-06-15 | 北京无线电测量研究所 | A kind of expansible digital power control system and method based on FPGA |
| CN108923676A (en) * | 2018-09-04 | 2018-11-30 | 兰州理工大学 | A kind of MMC control system that DSP is combined with CPLD |
| CN113193776A (en) * | 2021-05-31 | 2021-07-30 | 上海交通大学 | MMC structure based on synchronous handshake protocol and control method |
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