CN102457196B - 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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- CN102457196B CN102457196B CN201110434505.5A CN201110434505A CN102457196B CN 102457196 B CN102457196 B CN 102457196B CN 201110434505 A CN201110434505 A CN 201110434505A CN 102457196 B CN102457196 B CN 102457196B
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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 unit control plate of high voltage converter.
Background technology
In practical application, Medium Voltage Variable Frequency Speed Regulation Technology is mainly used in 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.In the situation that blower fan, pump class even load working conditions change are larger, adopt ac speed control technology, energy-saving effect is obvious, can reach the object of energy-saving and emission-reduction.
The development experience of high voltage converter various topological structures, up to the present, also do not form unified topological structure.At present, the most popular in voltage-source type, many level of units in series topological structure (United States Patent (USP) 4674024,5625545 and 5986909) on market.Unit series connection type multi-level high-voltage frequency transformer adopts the structure of several independent PWM frequency conversion power unit series connection, with realizing High voltage output after a plurality of low pressure and low power units in series, and improve output voltage waveforms (shown in Fig. 1, Fig. 2) by optimizing PWM algorithm.Fig. 1 is the structural representation of 6KV series type high-voltage frequency converter, and as shown in Figure 1, each of three-phase has the power cell of 5 series connection on mutually.As shown in Figure 2, each in series type high-voltage frequency converter three-phase has the power cell of 5 series connection on mutually.
From Fig. 1, Fig. 2, power cell is the elementary cell that forms voltage-type tandem type high voltage converter, and the reliability of power cell concerns the reliability of whole equipment, and for the design of power cell, the basic design framework of industry as shown in Figure 3.
Three-phase alternating current is from A0, B0, the input of C0 place, by melting disconnected device F1, after F2 and F3, carry out full-wave rectification (D1, D2, D3, D4, D5 and D6), the direct current after rectification is to capacitor C 1, C2 and C3 charging, and the voltage on electric capacity is directly by Q1, Q2, the H bridge that these four IGBT devices of Q3 and Q4 form is controlled.When Q1 and D4 open (Q3 and Q2 are in closed condition), the output T1 of power cell, voltage between 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 T2 just equals negative busbar voltage.In working control, power cell control circuit board receives from the order (communication between power cell control circuit board and 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 vital effect 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 practical application, the reliability of power cell not fully up to expectations, work is no more than six months conventionally just needs 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, large electric current and high-tension environment always, therefore, and the electromagnetism operational environment very severe of power cell control circuit board.But, all the time, power cell control circuit board must keep and main control board between normal communication (receive to Q1 Q2, the control command of Q3 and Q4 and send running status of local power cell etc., the undesired power cell fault that means of communication).Although current all existing products are to use optical fiber as the physical communication medium between power cell control circuit board and master control circuit board, operate in the interference that signal in optical fiber is not subject to electromagnetic radiation.But because power cell control circuit board self is to be operated in severe electromagnetic radiation environment, communication signal is likely subject to strong jamming on power cell control circuit board, cause Q1, Q2, the switch of Q3 and Q4 is incorrect, thereby or causes master board mistake to collect the information generation erroneous judgement of power cell.
The too high power cell that causes of H bridge working temperature that B, IGBT device form cannot work on.Due to H bridge (Q1, Q2, Q3 and Q4 totally four IGBT devices form) be operated in conducting frequently and cut-off state, when opening and closing, all can there is certain power loss, the power of loss changes into heat and can cause the temperature of power cell to rise, if power cell heat dissipating state is bad, (complete machine changes wind passage and goes wrong, extraneous air ambient temperature is crossed high factor and all may be caused this phenomenon to occur), thus the too high phenomenon of damaging components and parts of working temperature after long-play, inevitably caused.The power loss of IGBT device is relevant to the driving voltage Vgs of IGBT device and the working temperature of IGBT device, power loss when increasing the opening driving voltage Vge and can reduce IGBT device and open of IGBT device, but turning-on voltage can not unrestrictedly increase, when being greater than certain value, can damage IGBT device self.Therefore, when considering the factors such as circuit inductance and parasitic capacitance, generally, the turning-on voltage of IGBT device is to be all fixed on the safety value that Yi Ge producer is thought at present, but so-called safety value not makes the optimum value of IGBT device loss minimum.
Summary of the invention
The power unit control plate that the object of this invention is to provide a kind of high voltage converter, overcome two major failures that easily occur in above-mentioned prior art, the one, the antijamming capability of enhancing power unit control plate, electromagnetic interference influence when reducing to greatest extent power unit control plate and master board communication; Another object is by the indicatrix of the temperature monitoring of the components and parts in power cell (IGBT device) and components and parts (IGBT device), to regulate the turning-on voltage of components and parts (IGBT device), makes the turn-on consumption of components and parts (IGBT device) reach optimum.
For reaching above-mentioned object, technical solution of the present invention is:
A kind of power unit control plate of high voltage converter, described power unit control plate is connected between the master board (hereinafter to be referred as master board) of described high voltage converter and the power cell (hereinafter to be referred as power cell) of described high voltage converter, is the serial communication structure of receiving and sending out.By master board to power cell, be defined as the serial communication of receipts, by power cell to master board, be defined as the serial communication of sending out:
Described power unit control plate comprises fiber optical transceiver, input buffering filter circuit, programmable logic device, the crystal oscillator device being connected with programmable logic device with input buffering filter circuit, that connect with programmable logic device and corresponding with components and parts address in described power cell address DIP switch, photoisolator, digital to analog converter, temperature sensor, analog to digital converter and output buffer;
The described serial communication that is defined as receipts by master board to power cell, to receive by fiber optical transceiver the serial communication signals that master board is sent, through input buffering filter circuit and connected crystal oscillator device filtering interference signals, after strengthening signal code, input programmable logic device, 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, address date in address date in serial data packet and described address DIP switch compares, when the address date in serial data packet is consistent with address date in the DIP switch of address, components and parts in the power cell corresponding with address DIP switch send corresponding control command signal or send monitor data signal according to the requirement of serial data packet, this signal is delivered to described power cell by photoisolator and digital to analog converter,
The described serial communication of sending out that is defined as by power cell to master board, to be input in programmable logic device after the temperature of components and parts in the described power cell being recorded by temperature sensor converts analog signal to digital signal by analog to digital converter, the requirement of the serial data packet content that programmable logic device sends according to master board, sends to described master board by off state, voltage, the electric current of components and parts in described power cell and the temperature that recorded by temperature sensor by output buffer and fiber optical transceiver;
Programmable logic device also sends according to the temperature of components and parts and the relation of components and parts voltage in the temperature being recorded by temperature sensor and described power cell the signal of these components and parts being adjusted to turning-on voltage, this signal of adjusting turning-on voltage is by photoisolator, and in digital to analog converter and described power cell, the drive circuit of components and parts is adjusted the turning-on voltage of these components and parts.
Further, in described programmable logic device, 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 addition, input of the present invention buffering filter circuit comprise buffer be connected with its output by logical device filter circuit in series.
Components and parts in described power cell are IGBT electronic devices and components.
Power unit control plate of the present invention has significant advantage.
As the structure of the present invention, because, the present invention described by master board to power cell, be in the serial communication of receiving, after the serial communication signals of being sent by master board receives by fiber optical transceiver, first through input buffering filter circuit and connected crystal oscillator device filtering interference signals, strengthened the current driving ability of signal, met the current drives requirement of subsequent conditioning circuit, strengthened antijamming capability, electromagnetic interference influence when having reduced to greatest extent between power unit control plate of the present invention and described master board communication.So power unit control plate of the present invention has strengthened job stability and reliability, and the useful life that has extended it.
As the structure of the present invention, because the present invention, in the described serial communication of being received by master board and power cell, comprises address DIP switch that connect with programmable logic device and corresponding with components and parts address in described power cell.Enter after programmable logic device with the serial communication signals that increases electric current after filtering, 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, for the address in serial data packet and described address DIP switch, compare, while only having address date in serial data packet address date certain and in " address DIP switch " consistent, ability is sent control command to the components and parts address in the power cell corresponding with address DIP switch.Because the address date in serial data packet is the same with the address date in programmable logic device, so, by the corresponding address DIP switch in the components and parts address with in power cell, also just guaranteed that the address of components and parts in power cell that serial data packet will send to is consistent.And different address dates is therefrom stripped from out.Therefore, power unit control plate of the present invention not only transmits order accurately and reliably, and maintenance control panel is simple and convenient.
As the structure of the present invention, because, the present invention is at the described serial communication of sending out that is defined as by power cell to master board, to be input in programmable logic device after temperature by components and parts (as IGBT device) in the actual described power cell recording of temperature sensor converts analog signal to digital signal by analog to digital converter, the requirement of the serial data packet content that programmable logic device sends according to master board on the one hand, the temperature that this is recorded by temperature sensor sends to master board by output buffer and fiber optical transceiver; According to the temperature of components and parts (as IGBT device) and the indicatrix relation of voltage in the temperature being recorded by temperature sensor and power cell, send the signal of these components and parts being adjusted to turning-on voltage on the other hand, the signal of this adjustment turning-on voltage passes through photoisolator, in digital to analog converter and power cell, the drive circuit of components and parts is adjusted the turning-on voltage of these components and parts (IGBT device), makes the turn-on consumption of components and parts (IGBT device) reach optimum.
Accompanying drawing explanation
Fig. 1 is the structural representation of 6KV series type high-voltage frequency converter;
Fig. 2 be series type high-voltage frequency converter each have mutually the structural representation of 5 power unit cascades;
Fig. 3 is the schematic diagram of power cell one typical structure;
Fig. 4 is the structural representation of power unit control plate one embodiment of the present invention;
Fig. 5 is the structural representation of input buffering filter circuit one embodiment in Fig. 4;
Fig. 6 is transmission characteristic and the temperature relation curve chart of components and parts IGBT in described power cell.
Embodiment
Below in conjunction with drawings and Examples, further illustrate the architectural feature of power unit control plate of the present invention.
As shown in Figure 3, power unit control plate of the present invention (or becoming power cell control circuit board) is connected between the master board (or claiming master control circuit board) and the power cell of described high voltage converter of described high voltage converter, it is the serial communication structure of receiving and sending out, by master board to power cell, be defined as the serial communication of receipts, by power cell to master board, be defined as the serial communication of sending out.
As shown in Figure 4, power unit control plate of the present invention comprises fiber optical transceiver 1, input buffering filter circuit 2, programmable logic device 3, the crystal oscillator device 4 being connected with programmable logic device 3 with input buffering filter circuit 2, with programmable logic device 3 connections and corresponding with components and parts address in described power cell address DIP switches 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 described master board to power cell is defined as receipts is that the serial communication signals of being sent by fiber optical transceiver 1 reception master board is inputted programmable logic device 3 through filter circuit 2 filtering of input buffering 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, according to the content of serial data packet, address date in address date in serial data packet and described address DIP switch 5 compares, when the address date in serial data packet is consistent with address date in address DIP switch 5, components and parts to appropriate address send corresponding control command signal or send monitor data signal according to the requirement of serial data packet, this signal is delivered to described power cell by photoisolator 12 and digital to analog converter 11.
As shown in Figure 4, the described serial communication of sending out that is defined as by power cell to master board, by temperature sensor 6, 7, 8, components and parts Q1 in the 9 described power cells that record, Q3, Q4, the temperature of Q2 is input to programmable logic device 3 after converting analog signal to digital signal by analog to digital converter 10, the requirement of the serial data packet content that programmable logic device 3 sends according to master board, by components and parts Q1 in described power cell, Q2, Q3, the on off state of Q4, voltage, electric current and the temperature being recorded by temperature sensor send to described master board by output buffer 13 and fiber optical transceiver 1.
As shown in Figure 4, programmable logic device 3 is also according to temperature sensor 6, 7, 8, components and parts Q1 in the temperature of 9 actual measurements and described power cell, Q2, Q3, the relation curve of the temperature of Q4 and components and parts voltage (temperature as shown in Figure 6 and the indicatrix of voltage) sends these components and parts Q1, Q2, Q3, Q4 adjusts the signal of turning-on voltage, this signal of adjusting turning-on voltage is by photoisolator 12, in digital to analog converter 11 and described power cell, the drive circuit of components and parts is adjusted these components and parts Q1, Q2, Q3, the turning-on voltage of Q4, so that components and parts Q1, Q2, Q3, it is optimum that the turn-on consumption of Q4 reaches.
The 5CEA7 of the CycloneV series that in the present embodiment, described programmable logic device 3 employing altera corps provide.Inner writable special use communications protocol program as used in the invention described above.The included content of the serial data frame (serial data packet) of described programmable logic device 3 interior communications protocol (for special use of the present invention) is as shown in table 1.
Table 1
| Frame head | 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 described programmable logic device 3 interior communications protocol comprises frame head, power cell address, order data, data check, reply data and frame end.Wherein " frame head " is for identifying the initial of frame data; Power unit address refers to the address (in order to compare with the data in above-mentioned " address DIP switch " corresponding with components and parts address in power cell) of components and parts in described high voltage transducer power unit, and the components and parts of different power cells have different addresses; Order data be master board will with the content of the real communication of power cell, comprise that requirement sends monitor data (temperature, voltage, electric current etc.) 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, power unit control plate must send miscue and retransmission requesting in reply data.
In the present embodiment, described input buffering filter circuit 2 comprise buffer be connected with its output by logical device filter circuit in series.As shown in Figure 5, in the present embodiment, the 74LVC1G07SE-7 chip being provided by DIODE company is provided buffer 21(in the present embodiment) be for strengthening the current driving ability of signal, meet the current drives requirement of subsequent conditioning circuit.As shown in Figure 5, in the present embodiment, filter circuit 22 is by three logical devices (or claiming logic chip) U6, U7, U8 (in the present embodiment, U6, U7, U8 adopt the SN74AUC1G74 chip of TI company) in series.The logical device U6(D that signal one tunnel of buffer 21 outputs directly enters in filter circuit 22 triggers); An other road is as logical device U6, and U7(D triggers) and U8(D trigger) reset input.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, crystal oscillator signal is by low uprising time, logical device U6, the D end signal of U7 and U8 is latched to Q end (output signal of buffer is high width when to be greater than crystal oscillator signal be 3 times of high width, and the output Q end of U8 is for high); When buffer 21 output signals are low, the variation of crystal oscillator signal will be left in the basket, and the output Q end of U8 is forced to drag down.Therefore, according to the speed of serial communication, select suitable crystal oscillator signal, can the undesired interference signal of filtering (for example, the speed of serial communication is 5KHz, select the crystal oscillator signal of 24KHz, utilize the interference signal that this circuit just can the above speed of filtering 8KHz).
In the present embodiment, in described power cell, components and parts Q1, Q2, Q3, Q4 are IGBT electronic devices and components.Fig. 6 is transmission characteristic and the temperature relation curve chart of components and parts IGBT in described power cell.As shown in Figure 6, the electric current of the collector electrode On current Ic(current collection level of components and parts IGBT) and between turning-on voltage Vge in different temperatures Tj(IGBT junction temperature) under transmission characteristic.In Fig. 6, in the situation that Vce (voltage between the collector and emitter of IGBT) is constant, Tj is in 125 ℃ (solid-line curves in Fig. 6) and 25 ℃ (imaginary curve in Fig. 6), and Ic is with the curve (having identical physical phenomenon at remaining temperature) of Vge variation.Curve shows in Fig. 6 below different temperature, inching Vge, just can adjust turn-on consumption (turn-on consumption=Vce*Ic of IGBT.In the situation that Vge changes, if Vce is constant, Ic changes.If Ic is constant, Vce changes.No matter which kind of situation, all can regulate 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 by temperature sensor 6,7,8,9 perception, then enter programmable logic device 3, programmable logic device is adjusted the size of components and parts IGBT turning-on voltage Vge according to the temperature being recorded by temperature sensor 6,7,8,9 and the relation between turning-on voltage Vge (being stored in programmable logic device the inside).First programmable logic device passes through photoisolator to the driving signal of components and parts IGBT Q1, Q2, Q3, Q4, and then carries out digital-to-analogue conversion, and the analog signal after conversion is adjusted the turning-on voltage Vge of components and parts IGBT by components and parts IGBT drive circuit.
Meanwhile, the turning-on voltage Vge of the signal optimizing that power unit control plate of the present invention can also send according to master board or adjustment components and parts IGBT.The components and parts that do not need to change like this on power unit control plate other when driving the components and parts IGBT of different model.
Claims (4)
1. the power unit control plate of a high voltage converter, described power unit control plate is connected between the master board of described high voltage converter and the power cell of described high voltage converter, it is the serial communication structure of receiving and sending out, by the master board of described high voltage converter, to the power cell of described high voltage converter, be defined as the serial communication of receipts, by the power cell of described high voltage converter to the master board of described high voltage converter, be defined as the serial communication of sending out; It is characterized in that:
Described power unit control plate comprises fiber optical transceiver, input buffering filter circuit, programmable logic device, the crystal oscillator device being connected with programmable logic device with input buffering filter circuit, that connect with programmable logic device and corresponding with components and parts address in described power cell address DIP switch, photoisolator, digital to analog converter, temperature sensor, analog to digital converter and output buffer;
The described master board by high voltage converter is defined as the serial communication of receipts to the power cell of high voltage converter, to receive by fiber optical transceiver the serial communication signals that master board is sent, through input buffering filter circuit and connected crystal oscillator device filtering interference signals, after strengthening signal code, input programmable logic device, 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, address date in address date in serial data packet and described address DIP switch compares, when the address date in serial data packet is consistent with address date in the DIP switch of address, components and parts in the power cell corresponding with address DIP switch send corresponding control command signal or send monitor data signal according to the requirement of serial data packet, this signal is delivered to the power cell of described high voltage converter by photoisolator and digital to analog converter,
The described power cell by high voltage converter to the master board of high voltage converter is defined as the serial communication of sending out, to be input in programmable logic device after the temperature of components and parts in the described power cell being recorded by temperature sensor converts analog signal to digital signal by analog to digital converter, the requirement of the serial data packet content that programmable logic device sends according to master board, by the on off state of components and parts in described power cell, voltage, electric current and the temperature being recorded by temperature sensor send to the master board of described high voltage converter by output buffer and fiber optical transceiver,
Programmable logic device also sends according to the temperature of components and parts and the relation of components and parts voltage in the temperature being recorded by temperature sensor and described power cell the signal of these components and parts being adjusted to turning-on voltage, this signal of adjusting turning-on voltage is by photoisolator, and in digital to analog converter and described power cell, the drive circuit of components and parts is adjusted the turning-on voltage of these components and parts.
2. the power unit control plate of high voltage converter according to claim 1, is characterized in that, in described programmable logic device, 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.
3. the power unit control plate of high voltage converter according to claim 1, is characterized in that, described input buffering filter circuit comprise buffer be connected with its output by logical device filter circuit in series.
4. the power unit control plate of high voltage converter according to claim 1, is characterized in that, the components and parts in described power cell are IGBT electronic devices and components.
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| CN102830651B (en) * | 2012-09-07 | 2014-07-30 | 深圳市英威腾电气股份有限公司 | Electric transmission system and control method thereof |
| CN103856071B (en) * | 2012-12-07 | 2017-06-16 | 上海亿思特电气股份有限公司 | The power cell control circuit of high voltage converter |
| CN103743981B (en) * | 2014-01-17 | 2017-10-27 | 海南金盘电气有限公司 | A kind of test system of static reacance generator |
| CN105591652B (en) * | 2015-12-17 | 2019-04-23 | 滁州市博创电气有限公司 | 12 digital-to-analogue conversion plate cards are isolated in six channels entirely |
| 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 |
| CN110492758B (en) * | 2019-09-26 | 2024-08-23 | 苏州英威腾电力电子有限公司 | High-voltage power unit and high-voltage frequency converter |
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| CN1744419A (en) * | 2005-09-29 | 2006-03-08 | 北京金自天正智能控制股份有限公司 | Monitoring system for capcade multi-level high-voltage frequency transfomrer power unit |
| CN101369780A (en) * | 2007-08-14 | 2009-02-18 | 湖北三环发展股份有限公司 | Unit bypass apparatus and control method of unit cascading high voltage frequency convertor |
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| JP2011145208A (en) * | 2010-01-15 | 2011-07-28 | Hitachi Kokusai Electric Inc | Substrate |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1744419A (en) * | 2005-09-29 | 2006-03-08 | 北京金自天正智能控制股份有限公司 | Monitoring system for capcade multi-level high-voltage frequency transfomrer power unit |
| CN101369780A (en) * | 2007-08-14 | 2009-02-18 | 湖北三环发展股份有限公司 | Unit bypass apparatus and control method of unit cascading high voltage frequency convertor |
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