CN102457196A - Power unit control plate of high-voltage frequency converter - Google Patents
Power unit control plate of high-voltage frequency converter Download PDFInfo
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- CN102457196A CN102457196A CN2011104345055A CN201110434505A CN102457196A CN 102457196 A CN102457196 A CN 102457196A CN 2011104345055 A CN2011104345055 A CN 2011104345055A CN 201110434505 A CN201110434505 A CN 201110434505A CN 102457196 A CN102457196 A CN 102457196A
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Abstract
The invention relates to a power unit control plate of a high-voltage frequency converter. The power unit control plate is connected between a main control plate of the high-voltage frequency converter and a power unit of the high-voltage frequency converter, and is a receiving-transmitting serial communication structure; receiving serial communication is defined from the main control plate to the power unit, and transmitting serial communication is defined from the power unit to the main control plate; and an input serial communication signal firstly passes through an input buffer filter circuit to filter out an interfering signal so as to enhance the current drive capability and interference-free feature of the signal, thereby furthest reducing the electromagnetic interference influence in communication. The power unit control plate comprises an address dip switch which is connected with a programmable logic device and is corresponding to the address of a component in the power unit, thereby guaranteeing that a command is accurately and reliably transferred. A temperature sensor is used for measuring the temperature of the component in the power unit and transferring a characteristic curve to adjust the opening voltage of the component so that the opening loss of the component reaches the optimum.
Description
Technical field
The present invention relates to a kind of control board, particularly relate to a kind of power cell control board of high voltage converter.
Background technology
In the practical application; The high-voltage frequency conversion and speed-adjusting technology is mainly used in the high-voltage motor governing system, with its excellent speed governing with play a braking ability, high efficiency, High Power Factor and other many advantages such as the scope of application and be acknowledged as the most rising mode of speed regulation widely.Under the bigger situation of blower fan, pump class even load working conditions change, adopt ac speed control technology, energy-saving effect is obvious, can reach the purpose of energy-saving and emission-reduction.
Various topological structures has been experienced in the development of high voltage converter, up to the present, does not also form unified topological structure.At present, the most popular on the market like voltage-source type, many level of units in series topological structure (United States Patent (USP) 4674024,5625545 and 5986909).The unit series connection type multi-level high-voltage frequency transformer adopts the structure of several independent PWM frequency conversion power unit series connection, exports with realization high pressure after a plurality of low pressure and low power units in series, and improves output voltage waveforms (referring to Fig. 1, shown in Figure 2) through the optimized PWM algorithm.Fig. 1 is the structural representation of 6KV tandem high voltage converter, and is as shown in Figure 1, and each of three-phase has the power cell of 5 series connection on mutually.As shown in Figure 2, each in the tandem high voltage converter three-phase has the power cell of 5 series connection on mutually.
Visible by Fig. 1, Fig. 2, power cell is the elementary cell that constitutes voltage-type tandem type high voltage converter, and the reliability of power cell concerns the reliability of entire equipment, and for the design of power cell, the basic design framework of industry is as shown in Figure 3.
Three-phase alternating current is from A0, B0, and the input of C0 place through melting disconnected device F1, is carried out full-wave rectification (D1 behind F2 and the F3; D2, D3, D4, D5 and D6); Direct current after the rectification is given capacitor C 1, C2 and C3 charging, and the voltage on the electric capacity is directly by Q1, Q2, and the H bridge of these four IGBT devices compositions of Q3 and Q4 is controlled.When Q1 and D4 open (Q3 and Q2 are in closed condition); The output T1 of power cell, the voltage between the T2 just equals positive busbar voltage, when Q3 and Q2 open (Q1 and Q4 are in closed condition); The output T1 of power cell, the voltage between the T2 just equal the busbar voltage born.In the working control; The power cell control circuit board receives from the order (communication between power cell control circuit board and the master control circuit board is the digital communication that utilizes optical fiber) of the master control circuit board of high voltage converter and carries out Q1; Q2, Q3 and Q4 open and turn-off control.
As previously mentioned, power cell plays crucial effects to the unfailing performance of tandem multi-level high voltage converter, so the reliable power cell of design stability becomes the important process of research and development high reliability tandem multi-level high voltage converter.In the practical application, the reliability of power cell and not fully up to expectations, work is no more than six months usually just needs to safeguard or change, and has enumerated two major failures of power cell below:
A, anti-electromagnetic interference capability are limited.Each power cell of tandem multi-level high voltage converter is operated in high frequency, big electric current and the high-tension environment always, therefore, and the electromagnetism operational environment very severe of power cell control circuit board.But, all the time, the power cell control circuit board must keep and main control board between normal communication (receiving to Q1 Q2, the control command of Q3 and Q4 and the running status etc. of sending local power cell, the undesired power cell fault that means of communication).Though all existing products are to use optical fiber as the physical communication media between power cell control circuit board and the master control circuit board at present, operate in the interference that signal in the optical fiber does not receive electromagnetic radiation.But because the power cell control circuit board self is to be operated in the abominable electromagnetic radiation environment; Communication signal might receive strong jamming on the power cell control circuit board; Cause Q1; Q2, the switch of Q3 and Q4 is incorrect, thus the information that perhaps causes the master board mistake to collect power cell produces erroneous judgement.
The too high power cell that causes of H bridge working temperature that B, IGBT device are formed can't work on.Because H bridge (Q1; Q2; Q3 and Q4 totally four IGBT devices form) be operated in frequent conducting and cut-off state; All the certain power loss can be arranged when opening and closing, the power of loss changes into heat and can cause the temperature of power cell to rise, and (complete machine changes the wind passage and goes wrong if the power cell heat dissipating state is bad; The extraneous air ambient temperature is crossed high factor and all possibly caused this phenomenon to occur), thus the too high phenomenon of damaging components and parts of working temperature caused behind the long-play inevitably.The power loss of IGBT device is relevant with the working temperature of IGBT device drive voltage Vgs and IGBT device; Power loss when increasing the opening driving voltage Vge and can reduce the IGBT device and open of IGBT device; But turning-on voltage can not unrestrictedly increase, and when greater than certain value the time, can damage IGBT device self.Therefore, when taking all factors into consideration factor such as circuit inductance and parasitic capacitance, generally speaking, the turning-on voltage of IGBT device all is to be fixed on the safety value that a producer is thought at present, but so-called safety value is not the optimum value that makes the IGBT device loss minimum.
Summary of the invention
The power cell control board that the purpose of this invention is to provide a kind of high voltage converter; Overcome two major failures that occur easily in the above-mentioned prior art; The one, the antijamming capability of enhanced power unit controls plate, the electromagnetic interference effect when reducing power cell control board and master board communication to greatest extent; Another purpose is through the indicatrix of the temperature monitoring of the components and parts in the power cell (IGBT device) and components and parts (IGBT device) being regulated the turning-on voltage of components and parts (IGBT device), being made the turn-on consumption of components and parts (IGBT device) reach optimum.
For reaching above-mentioned purpose, technical solution of the present invention is:
A kind of power cell control board of high voltage converter; Said power cell control board is connected between the power cell (hereinafter to be referred as power cell) of master board (hereinafter to be referred as master board) and said high voltage converter of said high voltage converter, is the serial communication structure of receiving and sending out.Be defined as the serial communication of receipts by master board to power cell, be defined as the serial communication of sending out by power cell to master board:
Said power cell control board comprises fiber optical transceiver, input buffering filter circuit, programmable logic device; The crystal oscillator device that is connected with programmable logic device with the input buffering filter circuit; That be connected with programmable logic device and with said power cell in corresponding address, components and parts address DIP switch, photoisolator, digital to analog converter; Temperature sensor, analog to digital converter and output buffer;
The said serial communication that is defined as receipts by master board to power cell; Be to receive the serial communication signals that master board is sent by fiber optical transceiver; Through input buffering filter circuit and connected crystal oscillator device filtering interference signals; Import programmable logic device behind the enhancing signal electric current; Programmable logic device receives and resolves the content of the serial data packet of this serial communication signals, according to the content of serial data packet, after comparing for the address in the serial data packet and said address DIP switch; To with the corresponding power cell of address DIP switch in components and parts send the control commands corresponding signal or send the monitor data signal according to the requirement of serial data packet, this signal is delivered to said power cell through photoisolator and digital to analog converter;
The said serial communication of sending out that is defined as by power cell to master board; Be to be input in the programmable logic device after the temperature of components and parts in the said power cell that is recorded by temperature sensor becomes digital signal through analog to digital converter with analog signal conversion; The requirement of the serial data packet content that programmable logic device sends according to master board sends to said master board with the temperature of on off state, voltage, electric current and the actual measurement of components and parts in the said power cell through output buffer and fiber optical transceiver;
Programmable logic device also sends the signal to this components and parts adjustment turning-on voltage according to the temperature of components and parts in temperature of surveying and the said power cell and the relation of components and parts voltage; The signal of this adjustment turning-on voltage is through photoisolator, and the drive circuit of components and parts is adjusted the turning-on voltage of these components and parts in digital to analog converter and the said power cell.
Further, the content of the serial data packet of communications protocol comprises frame head, power cell address, order data, data check, reply data and frame end in the said programmable logic device.
In addition, input buffering filter circuit according to the invention comprises buffer and the filter circuit that is made up of logical device series connection that is connected with its output.
Components and parts in the said power cell are IGBT electronic devices and components.
Power cell control board of the present invention has significant advantage.
Like above-mentioned structure of the present invention; Because; The present invention said be in the serial communication of receiving by master board to power cell, after the serial communication signals of being sent by master board receives through fiber optical transceiver, at first pass through input buffering filter circuit and connected crystal oscillator device filtering interference signals; Strengthened the current driving ability of signal; Satisfied the current drives requirement of subsequent conditioning circuit, strengthened antijamming capability, electromagnetic interference effect when having reduced between power cell control board of the present invention and the said master board communication to greatest extent.So power cell control board of the present invention has strengthened job stability and reliability, and the useful life that has prolonged it.
Like above-mentioned structure of the present invention because, the present invention in the said serial communication of receiving by master board and power cell, comprise be connected with programmable logic device and with said power cell in corresponding address, components and parts address DIP switch.Behind the serial communication signals entering programmable logic device through filtering and increase electric current; Programmable logic device receives and resolves the content of the serial data packet of this serial communication signals; Content according to serial data packet; Compare for address in the serial data packet and said address DIP switch; Have only when the address date in the serial data packet certain with " address DIP switch " in address date when consistent, ability to the corresponding power cell of address DIP switch in the components and parts address send control command.Because address date in the serial data packet and the address date in the programmable logic device are the same; So, through with power cell in corresponding address, components and parts address DIP switch also just guaranteed serial data packet in the power cell that will send to the address of components and parts be consistent.And the different address data therefrom are stripped from out.Therefore, power cell control board of the present invention not only transmits order accurately and reliably, and maintenance control panel is simple and convenient.
Like above-mentioned structure of the present invention; Because; The present invention is at the said serial communication of sending out that is defined as by power cell to master board; Be to be input in the programmable logic device after temperature by components and parts (like the IGBT device) in the actual said power cell that records of temperature sensor becomes digital signal through analog to digital converter with analog signal conversion; The requirement of the serial data packet content that programmable logic device sends according to master board on the one hand sends to master board with the temperature of this actual measurement through output buffer and fiber optical transceiver; Send signal according to the temperature of components and parts (like the IGBT device) in temperature of surveying and the power cell and the indicatrix relation of voltage on the other hand to this components and parts adjustment turning-on voltage; The signal of this adjustment turning-on voltage passes through photoisolator; The drive circuit of components and parts is adjusted the turning-on voltage of these components and parts (IGBT device) in digital to analog converter and the power cell, makes the turn-on consumption of components and parts (IGBT device) reach optimum.
Description of drawings
Fig. 1 is the structural representation of 6KV tandem high voltage converter;
Fig. 2 be the tandem high voltage converter each the structural representation of 5 power unit cascades is arranged mutually;
Fig. 3 is the sketch map of power cell one typical structure;
Fig. 4 is the structural representation of power cell control board one embodiment of the present invention;
Fig. 5 is the structural representation of input buffering filter circuit one embodiment among Fig. 4;
Fig. 6 is transmission characteristic and the temperature relation curve chart of components and parts IGBT in the said power cell.
Embodiment
Further specify the architectural feature of power cell control board of the present invention below in conjunction with accompanying drawing and embodiment.
As shown in Figure 3; Power cell control board of the present invention (or becoming the power cell control circuit board) is connected between the power cell of master board (or claim master control circuit board) and said high voltage converter of said high voltage converter; It is the serial communication structure of receiving and sending out; Be defined as the serial communication of receipts by master board to power cell, be defined as the serial communication of sending out by power cell to master board.
As shown in Figure 4, power cell control board according to the invention comprises fiber optical transceiver 1, input buffering filter circuit 2; Programmable logic device 3, the crystal oscillator device 4 that is connected with programmable logic device 3 with input buffering filter circuit 2, that be connected with programmable logic device 3 and with said power cell in corresponding address, components and parts address DIP switch 5; Photoisolator 12; Digital to analog converter 11, temperature sensor 6,7,8,9, analog to digital converter 10 and output buffer 13.
As shown in Figure 4; The serial communication that said master board to power cell is defined as receipts is to import programmable logic device 3 by the serial communication signals that fiber optical transceiver 1 reception master board is sent through 2 filtering of input buffering filter circuit with after strengthening current signal; Programmable logic device 3 receives and resolves the content of the serial data packet (or claiming serial data frame) of this serial communication signals; Content according to serial data packet; After comparing for the address in the serial data packet and said address DIP switch 5; Components and parts to appropriate address send the control commands corresponding signal or send the monitor data signal according to the requirement of serial data packet, and this signal is delivered to said power cell through photoisolator 12 and digital to analog converter 11.
As shown in Figure 4; The said serial communication of sending out that is defined as by power cell to master board; Be to be input to programmable logic device 3 after the temperature of components and parts Q1, Q3, Q4, Q2 in the said power cell that is recorded by temperature sensor 6,7,8,9 becomes digital signal through analog to digital converter 10 with analog signal conversion; The requirement of the serial data packet content that programmable logic device 3 sends according to master board sends to said master board with the temperature of on off state, voltage, electric current and the actual measurement of components and parts Q1, Q2, Q3, Q4 in the said power cell through output buffer 13 and fiber optical transceiver 1.
As shown in Figure 4; Programmable logic device 3 also sends the signal of these components and parts Q1, Q2, Q3, Q4 being adjusted turning-on voltage according to components and parts Q1, Q2, Q3, the temperature of Q4 and the relation curve (temperature as shown in Figure 6 and the indicatrix of voltage) of components and parts voltage in the temperature of temperature sensor 6,7,8,9 actual measurement and the said power cell; The signal of this adjustment turning-on voltage is through photoisolator 12; The drive circuit of components and parts is adjusted the turning-on voltage of these components and parts Q1, Q2, Q3, Q4 in digital to analog converter 11 and the said power cell, so that the turn-on consumption of components and parts Q1, Q2, Q3, Q4 reaches optimum.
In the present embodiment, said programmable logic device 3 adopts the serial 5CEA7 of CycloneV that altera corp provides.Inner writable special use such as the used communications protocol program of above-mentioned the present invention.Communications protocol in the said programmable logic device 3 (for the present invention special-purpose) the included content of serial data frame (serial data packet) as shown in table 1.
Table 1
| Frame head | The power cell address | Order data | Data check | Reply data | Frame end |
As shown in table 1, the content of the serial data packet (serial data frame) of communications protocol comprises frame head, power cell address, order data, data check, reply data and frame end in the said programmable logic device 3.Wherein " frame head " is to be used for identifying the initial of frame data; The power unit address be meant components and parts in the said high voltage transducer power unit the address (in order to above-mentioned and power cell in data in the components and parts address corresponding " address DIP switch " compare), the components and parts of different power unit have different address; Order data be master board will with the content of the real communication of power cell, comprise that monitor data (temperature, voltage, electric current etc.) is sent in requirement or to Q1, Q2, the switch control command of Q3 and Q4.If certain reason (electromagnetic interference or master board fault), address error or check errors, the power cell control board must send miscue and retransmission requesting in reply data.
In the present embodiment, said input buffering filter circuit 2 comprises buffer and the filter circuit that is made up of logical device series connection that is connected with its output.As shown in Figure 5, in the present embodiment, buffer 21 (adopting the 74LVC1G07SE-7 chip that is provided by DIODE company in the present embodiment) is to be used for the current driving ability of enhancing signal, satisfies the current drives requirement of subsequent conditioning circuit.As shown in Figure 5, in the present embodiment, filter circuit 22 is to constitute (in the present embodiment, U6, U7, U8 adopt the SN74AUC1G74 chip of TI company) by three logical devices (or claiming logic chip) U6, U7, U8 series connection.The signal one tunnel of buffer 21 outputs directly gets into the logical device U6 (D triggering) in the filter circuit 22; Other one the tunnel as logical device U6, the input that resets of U7 (D triggering) and U8 (D triggering).The crystal oscillator signal of crystal oscillator device 4 output is as logical device U6, the clock signal of U7 and U8.Output signal at buffer 21 is high; The crystal oscillator signal is by low uprising the time; Logical device U6, the D end signal of U7 and U8 are latched into Q end (the output signal of buffer is high width greater than the crystal oscillator signal be 3 times of high width time, the output Q end of U8 is for high); It is low exporting signals when buffer 21, and the variation of crystal oscillator signal will be left in the basket, and the output Q end of U8 is forced and drags down.Therefore, the crystal oscillator signal suitable according to the speed selection of serial communication, can the undesired interference signal of filtering (for example, the speed of serial communication is 5KHz, selects the crystal oscillator signal of 24KHz, utilizes the interference signal that this circuit just can the above speed of filtering 8KHz).
In the present embodiment, components and parts Q1, Q2, Q3, Q4 are the IGBT electronic devices and components in the said power cell.Fig. 6 is transmission characteristic and the temperature relation curve chart of components and parts IGBT in the said power cell.As shown in Figure 6, the transmission characteristic between the collector electrode conducting electric current I c (electric current of collector) of components and parts IGBT and the turning-on voltage Vge under different temperatures Tj (IGBT junction temperature).Among Fig. 6, under the constant situation of Vce (voltage between the collector and emitter of IGBT), Tj in 125 ℃ (solid-line curves among Fig. 6) and 25 ℃ (imaginary curve among Fig. 6), the curve (identical physical phenomenon is arranged under remaining temperature) that Ic changes with Vge.Curve shows among Fig. 6 below different temperature, inching Vge just can adjust turn-on consumption (turn-on consumption=Vce*Ic of IGBT.Under the situation that Vge changes, if Vce is constant, then Ic changes.If Ic is constant, then Vce changes.No matter which kind of situation all can be regulated turn-on consumption).
As shown in Figure 4; The temperature of components and parts IGBT Q1, Q2, Q3, Q4 is sent to analog to digital conversion circuit 10 after through temperature sensor 6,7,8,9 perception; Get into programmable logic device 3 then, the size that programmable logic device is adjusted components and parts IGBT turning-on voltage Vge according to the temperature and the relation between the turning-on voltage Vge (being stored in the programmable logic device the inside) of actual measurement.Programmable logic device gives the drive signal of components and parts IGBT Q1, Q2, Q3, Q4 at first through photoisolator, and then carries out digital-to-analogue conversion, and the analog signal after the conversion is adjusted the turning-on voltage Vge of components and parts IGBT through components and parts IGBT drive circuit.
Simultaneously, power cell control board of the present invention can also perhaps be adjusted the turning-on voltage Vge of components and parts IGBT according to the signal optimizing that master board sends.When driving the components and parts IGBT of different model, need not change on the power cell control board other components and parts like this.
Claims (4)
1. the power cell control board of a high voltage converter; Said power cell control board is connected between the power cell of master board and said high voltage converter of said high voltage converter; It is the serial communication structure of receiving and sending out; Be defined as the serial communication of receipts by the power cell of the master board of said high voltage converter to said high voltage converter, be defined as the serial communication of sending out by the master board of power cell to the said high voltage converter of said high voltage converter; It is characterized in that:
Said power cell control board comprises fiber optical transceiver, input buffering filter circuit, programmable logic device; The crystal oscillator device that is connected with programmable logic device with the input buffering filter circuit; That be connected with programmable logic device and with said power cell in corresponding address, components and parts address DIP switch, photoisolator, digital to analog converter; Temperature sensor, analog to digital converter and output buffer;
The power cell of said master board to high voltage converter by high voltage converter is defined as the serial communication of receipts; Be to receive the serial communication signals that master board is sent by fiber optical transceiver; Through input buffering filter circuit and connected crystal oscillator device filtering interference signals; Import programmable logic device behind the enhancing signal electric current; Programmable logic device receives and resolves the content of the serial data packet of this serial communication signals, according to the content of serial data packet, after comparing for the address in the serial data packet and said address DIP switch; To with the corresponding power cell of address DIP switch in components and parts send the control commands corresponding signal or send the monitor data signal according to the requirement of serial data packet, this signal is delivered to the power cell of said high voltage converter through photoisolator and digital to analog converter;
The master board of said power cell to high voltage converter by high voltage converter is defined as the serial communication of sending out; Be to be input in the programmable logic device after the temperature of components and parts in the said power cell that is recorded by temperature sensor becomes digital signal through analog to digital converter with analog signal conversion; The requirement of the serial data packet content that programmable logic device sends according to master board sends to the temperature of on off state, voltage, electric current and the actual measurement of components and parts in the said power cell master board of said high voltage converter through output buffer and fiber optical transceiver;
Programmable logic device also sends the signal to this components and parts adjustment turning-on voltage according to the temperature of components and parts in temperature of surveying and the said power cell and the relation of components and parts voltage; The signal of this adjustment turning-on voltage is through photoisolator, and the drive circuit of components and parts is adjusted the turning-on voltage of these components and parts in digital to analog converter and the said power cell.
2. the power cell control board of high voltage converter according to claim 1 is characterized in that, the content of the serial data packet of communications protocol comprises frame head in the said programmable logic device; The power cell address; Order data, data check, reply data and frame end.
3. the power cell control board of high voltage converter according to claim 1 is characterized in that, said input buffering filter circuit comprises buffer and the filter circuit that is made up of logical device series connection that is connected with its output.
4. the power cell control board of high voltage converter according to claim 1 is characterized in that, the components and parts in the said power cell are IGBT electronic devices and components.
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| CN102830651A (en) * | 2012-09-07 | 2012-12-19 | 深圳市英威腾电气股份有限公司 | Electric transmission system and control method thereof |
| CN103743981A (en) * | 2014-01-17 | 2014-04-23 | 海南金盘电气有限公司 | Testing system for static var generator |
| CN103856071A (en) * | 2012-12-07 | 2014-06-11 | 上海亿思特电气股份有限公司 | Power unit control circuit of high-voltage frequency converter |
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| CN102830651A (en) * | 2012-09-07 | 2012-12-19 | 深圳市英威腾电气股份有限公司 | Electric transmission system and control method thereof |
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| CN103743981A (en) * | 2014-01-17 | 2014-04-23 | 海南金盘电气有限公司 | Testing system for static var generator |
| CN105591652A (en) * | 2015-12-17 | 2016-05-18 | 滁州市博创电气有限公司 | Six-channel full-isolated 12-bit digital-to-analog conversion board |
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| CN105391310A (en) * | 2015-12-19 | 2016-03-09 | 蒋小春 | Intelligent power unit for high-power converter device and control method |
| CN105391310B (en) * | 2015-12-19 | 2018-04-06 | 四川中大华瑞能源技术有限公司 | The intelligent power unit and control method of high-power current converting device |
| CN105551230A (en) * | 2016-03-04 | 2016-05-04 | 辽宁荣信电气传动技术有限责任公司 | Single-fiber ring network communication topology structure for power units of high-voltage frequency converter |
| CN108834267A (en) * | 2018-08-29 | 2018-11-16 | 华域视觉科技(上海)有限公司 | Flowing water taillight control circuit |
| CN110874074A (en) * | 2018-09-04 | 2020-03-10 | 中国石油化工股份有限公司 | Communication method, communication device and communication system between industrial personal computer and controlled equipment |
| CN110492758A (en) * | 2019-09-26 | 2019-11-22 | 苏州英威腾电力电子有限公司 | A kind of high-voltage power unit and high-voltage frequency converter |
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| CN102457196B (en) | 2014-04-09 |
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