CN102751944A - Method and system for controlling middle/high voltage frequency converter - Google Patents
Method and system for controlling middle/high voltage frequency converter Download PDFInfo
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- CN102751944A CN102751944A CN2012102227152A CN201210222715A CN102751944A CN 102751944 A CN102751944 A CN 102751944A CN 2012102227152 A CN2012102227152 A CN 2012102227152A CN 201210222715 A CN201210222715 A CN 201210222715A CN 102751944 A CN102751944 A CN 102751944A
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Abstract
The invention provides a method and a system for controlling a middle/high voltage frequency converter. The method comprises following steps of: transmitting an inversion modulation wave instruction controlled by voltage/frequency (V/F) or a vector to a control unit by a first main control chip; respectively connecting the control unit with the first main control chip, a second main control chip and each power unit so as to generate pulse width modulation (PWM) waves of each power unit through comparing a modulation wave with a stated carrier wave according to the inversion modulation wave instruction which is controlled by V/F or the vector, and transmit the PWM waves to the corresponding power units to realize V/F control or vector control over a motor; transmitting a logic control instruction on the motor to the control unit by the second main control chip; and transmitting the logic control instruction to the power units by the control unit so as to realize the logic control over the motor.
Description
Technical field
The present invention relates to electronic technology, relate in particular to a kind of control method and system of mesohigh frequency converter.
Background technology
At present, a main stream approach in the mesohigh frequency converter scheme is utilized the power unit cascade scheme exactly, and multistage low pressure and low power units in series is got up to realize high pressure output.Wherein, this scheme possess harmonic wave of output voltage little, improve electrical machinery life and reduce electromagnetic interference etc. limited.In addition; In the high voltage converter of cascade of power units formula; Controller is its most crucial topmost component part, and it mainly is tasks such as input and output processing of accomplishing motor control strategy, many level pulse widths (PWM) algorithm, fiber optic serial communication, host computer communication, digital quantity/analog quantity.The real-time of controller and disposal ability have determined the control performance of system to motor greatly.
Controller of the prior art mainly comprises: main control chip and a plurality of outer net control unit.Wherein, peripheral control unit generally is the chip that possesses certain logical process ability, for example MCU or CPLD etc.Each peripheral control unit is responsible for the control of a power cell; All peripheral control units directly carry out communicating by letter of data with control chip; Main control chip is being brought into play commander in chief's effect; Be that the main control chip transmitting control commands is given after the instruction that each peripheral control unit, peripheral control unit receive master control through the optical fiber communication sending controling instruction to power cell.Peripheral control unit transmitting element control command is given each power cell, and the processing power unit feeds back the running state information of coming and feeds back to main control chip more simultaneously.
But, because the execution command that controller can only serial, power cell is sent out the poor synchronization of PWM ripple control, therefore, caused the time error of each power cell action big, and control performance is undesirable, cost is high and reliability is low.
Summary of the invention
The present invention provides a kind of control method and system of mesohigh frequency converter; Be used to solve the execution command that the prior art middle controller can only serial; Power cell is sent out the poor synchronization of PWM ripple control; Therefore, caused the time error of each power cell action big, and the problem that control performance is undesirable, cost is high and reliability is low.
First aspect of the present invention provides a kind of control system of mesohigh frequency converter, comprising: first main control chip, control unit, second main control chip and power cell;
Said first main control chip is connected with said control unit, is used for the inversion modulating wave instruction of V/F or vector control is sent to said control unit;
Said control unit; Be connected with said first main control chip, second main control chip and each said power cell respectively; Be used for inversion modulating wave instruction, the carrier wave after modulating wave and the setting is compared, generate the pulse width modulation (PWM) ripple of each said power cell according to said V/F or vector control; And said PWM ripple sent to corresponding said each power cell, to realize the V/F control or the vector control of motor;
Said second main control chip is connected with said control unit, is used to send logic control and orders to said control unit;
Said control unit also is used for said logic control order is sent to said power cell, to realize the logic control to said motor.
Another aspect of the present invention provides a kind of control method of mesohigh frequency converter, comprising:
First main control chip sends to control unit with the inversion modulating wave instruction of said V/F or vector control;
Said control unit is according to the inversion modulating wave instruction of said V/F or vector control; The carrier wave of modulating wave and setting is compared; Generate the pulse width modulation (PWM) ripple of each said power cell; And said PWM ripple sent to corresponding said each power cell, to realize the V/F control or the vector control of motor;
Said second main control chip sends logic control and orders to said control unit;
Said control unit sends to said power cell with said logic control order, to realize the logic control to said motor.
Technique effect of the present invention is: through first main control chip and the second main control chip concurrent working; And independent respectively algorithm or the logic task be responsible for; Thereby improved the reliability of control performance effectively, made that the asynchronous serial communication of the execution command that real-time of the present invention can only serial than prior art middle controller is high; In addition,, thereby guaranteed the synchronism of each power cell control, the performance of system is provided because FPGA can send PWM ripple and logic control order to each power cell simultaneously.
Description of drawings
Fig. 1 is the structural representation of an embodiment of the control system of mesohigh frequency converter of the present invention;
Fig. 2 is the structural representation of another embodiment of the control system of mesohigh frequency converter of the present invention;
Fig. 3 is the flow chart of an embodiment of the control method of mesohigh frequency converter of the present invention.
Embodiment
Fig. 1 is the structural representation of an embodiment of the control system of mesohigh frequency converter of the present invention; As shown in Figure 1; The system of present embodiment comprises: first main control chip 11, control unit 12, second main control chip 13 and power cell 14; Wherein, first main control chip 11 is connected with control unit 12, is used for the inversion modulating wave instruction of this V/F or vector control is sent to control unit 12; Control unit 12 is connected with first main control chip 11, second main control chip 12 and each power cell 14 respectively; Be used for inversion modulating wave instruction according to this V/F or vector control; Carrier wave after modulating wave and the setting is compared, generate pulse width modulation (the Pulse Width Modulation of each power cell 14; Be called for short: PWM) ripple, and the PWM ripple sent to each corresponding power cell 14, to realize the V/F control or the vector control of motor; Second main control chip 13 is connected with control unit 12, is used to send the logic control of motor is ordered to this control unit 12.This control unit 12 also is used for this logic control order is sent to this power cell 14, to realize the logic control to motor.
Wherein, carrier wave is meant the frequency of switching tube.
Preferably, this control unit 12 can be specially field programmable gate array (Field-Programmable Gate Array; Be called for short: FPGA).Control unit 12 specifically can be connected with each power cell through optical fiber interface; And the logic control of motor comprises logic controls such as rotating to motor, acceleration and deceleration.
In addition, in the present embodiment, this first main control chip 11 can comprise at least one microprocessor, for example: Digital Signal Processing (Digital Signal Processing; Be called for short: DSP), single-chip microcomputer or ARM etc.Second main control chip also can specifically comprise at least one microprocessor, for example: DSP, single-chip microcomputer or ARM etc.Need to prove, first main control chip 11 and second main control chip 13 can be identical also can be inequality.
Need to prove that also V/F control and vector control are two kinds of control methods of motor, wherein; V/F is fairly simple; Just output voltage V is carried out the calculating of constant proportion example with output frequency F, vector control is more complicated then, is to be 2 current phasor sums through vector method with the Current Decomposition of motor; Be a kind of flux regulator method of motor, this control method is more superior than V/F control method.
In the present embodiment; Through first main control chip and the second main control chip concurrent working; And independent respectively algorithm or the logic task be responsible for; Thereby improved the reliability of control performance effectively, made that the asynchronous serial communication of the execution command that real-time of the present invention can only serial than prior art middle controller is high; In addition,, thereby guaranteed the synchronism of each power cell control, the performance of system is provided because FPGA can send PWM ripple and logic control order to each power cell simultaneously.
Fig. 2 is the structural representation of another embodiment of the control system of mesohigh frequency converter of the present invention; On above-mentioned basis embodiment illustrated in fig. 1; As shown in Figure 2, this control unit 12 comprises: dual port RAM module 121, unit information processing module 122, PWM ripple generating module 123 and Communications Processor Module 124.Concrete, dual port RAM module 121 is connected with this second main control chip 13 with first main control chip 11, is used to realize the data high-speed communication between this first main control chip 11 and this second main control chip 13; Unit information processing module 122 is connected with this second main control chip 13 respectively, is used to receive the operating state signal of each power cell, and this operating state signal is sent to this second main control chip 13; And reception is ordered from the control logic to motor that this second main control chip sends; PWM ripple generating module 123; Be connected with this first main control chip 11; Be used to receive this V/F that this first main control chip 11 sends or the inversion modulating wave instruction of vector control, and according to the inversion modulating wave instruction of this V/F or vector control, the carrier wave of modulating wave and setting is compared; Generate the PWM ripple of each power cell, and the PWM ripple of this each power cell is exported; Communications Processor Module 124 is connected with each power cell with this unit information processing module 122, this PWM ripple generating module 123 respectively; The operating state signal of each power cell that is used for receiving is transmitted to unit information processing module 122, and the PWM ripple and the logic control instruction of this each power cell sent to each power cell through optical fiber communication.
In addition; Owing in control unit 12, be provided with the dual port RAM module; Thereby make win main control chip 11 and second main control chip 13 carry out read-write operation to the same address location in the dual port RAM module simultaneously and do not clash, and access time only needed for tens nanoseconds.For instance, in the present embodiment, the dual port RAM module comprises port A and port B, and wherein, port A links to each other with first main control chip 11, and port B links to each other with second main control chip 13.FPGA 12 also is equivalent to a control chip, and possesses certain information processing capability, thereby can share the burden of two main control chips, satisfies high-end Frequency Converter Control demand.
Further, second main control chip 13 also is used for process user control input and output (Input Output; Be called for short: IO) signal, system's control IO signal and analog input output signal; Receive the input voltage and the input current of frequency converter; User's man-machine interface (Human Machine Interface is provided; Be called for short: HMI) and with host computer carry out data communication.
Wherein, this input voltage and input current can be shown to the user through HMI, and when input voltage and/or input current are unusual, send information warning, to remind the user.
First main control chip 11 also is used to gather output voltage, output current and the motor speed feedback signal of this frequency converter.
Wherein, first main control chip 11 can specifically be used for obtaining vector operation according to output voltage and output current, and according to vector operation, obtains the inversion modulating wave instruction of vector control;
In addition, first main control chip 11 also is used for according to this motor speed feedback signal, generates the motor speed instruction, and this motor speed instruction is sent to this control unit 12;
Preferably, this second control chip 13 also is used to receive the operating state signal of each power cell of control unit 12 feedbacks, and shows that through HMI this operating state signal gives the user.
More preferably, this second control chip 13 can also be realized the input/output interface function with the user.
In the present embodiment; Through first main control chip and the second main control chip concurrent working; And independent respectively algorithm or the logic task be responsible for; Thereby improved the reliability of control performance effectively; And the dual port RAM module inner through FPGA realizes the data in high speed communication between first main control chip and second main control chip, promptly can carry out read-write operation to the same address location in the dual port RAM simultaneously, makes that the asynchronous serial communication of the execution command that real-time of the present invention can only serial than prior art middle controller is high; In addition,, thereby guaranteed the synchronism of each power cell control, the performance of system is provided because FPGA can send PWM ripple and logic control order to each power cell simultaneously.
Also need to prove; Main control chip in the control system of mesohigh frequency converter of the present invention is not limited to above-mentioned described two main control chips; Can also comprise four main control chips, its realization principle that realizes principle and above-mentioned two main control chips is similar, repeats no more here.
Fig. 3 is the flow chart of an embodiment of the control method of mesohigh frequency converter of the present invention, and as shown in Figure 3, the method for present embodiment comprises:
Wherein, control unit can be FPGA, and specifically can be connected with each power cell through optical fiber interface; And the logic control of motor comprises logic controls such as rotating to motor, acceleration and deceleration.
In addition, this first main control chip can comprise at least one microprocessor, for example: DSP, single-chip microcomputer or ARM etc.Second main control chip also can specifically comprise at least one microprocessor, for example: DSP, single-chip microcomputer or ARM etc.Need to prove, first main control chip and second main control chip can be identical also can be inequality.
In the present embodiment; Through first main control chip and the second main control chip concurrent working; And independent respectively algorithm or the logic task be responsible for; Thereby improved the reliability of control performance effectively, made that the asynchronous serial communication of the execution command that real-time of the present invention can only serial than prior art middle controller is high; In addition,, thereby guaranteed the synchronism of each power cell control, the performance of system is provided because FPGA can send PWM ripple and logic control order to each power cell simultaneously.
Further, in another embodiment of the present invention, on the basis of above-mentioned method embodiment shown in Figure 3, carry out data high-speed communication through the dual port RAM module among this FPGA between this first main control chip and this second main control chip.
In the present embodiment; Owing in FPGA, be provided with the dual port RAM module; Thereby make win main control chip and second main control chip carry out read-write operation to the same address location in the dual port RAM module simultaneously and do not clash, and access time only needed for tens nanoseconds.
In addition, this method can further include:
Second main control chip process user control IO signal, system's control IO signal and analog input output signal; Receive the input voltage and the input current of this frequency converter; And user's man-machine interface is provided and carries out data communication with host computer.
And/or,
First main control chip is gathered output voltage, output current and the motor speed feedback signal of this frequency converter.
Then the acquisition process of the inversion modulating wave of vector control instruction is:
According to output voltage and output current, obtain vector operation, and, obtain the inversion modulating wave instruction of vector control according to vector operation;
And this method can further include:
First main control chip generates the motor speed instruction according to the motor speed feedback signal, and the motor speed instruction is sent to control unit;
Control unit sends to each corresponding power cell with the motor speed instruction, to realize rotating speed of motor control.
In the present embodiment,, and independently be responsible for algorithm or logic task respectively, thereby improved the reliability of control performance effectively through first main control chip and the second main control chip concurrent working; And the dual port RAM module inner through FPGA realizes the data in high speed communication between first main control chip and second main control chip; Promptly can carry out read-write operation to the same address location in the dual port RAM simultaneously, make that the asynchronous serial communication of the execution command that real-time of the present invention can only serial than prior art middle controller is high; In addition,, thereby guaranteed the synchronism of each power cell control, the performance of system is provided because FPGA can send PWM ripple and logic control order to each power cell simultaneously.
What should explain at last is: above each embodiment is only in order to explaining technical scheme of the present invention, but not to its restriction; Although the present invention has been carried out detailed explanation with reference to aforementioned each embodiment; Those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, perhaps to wherein part or all technical characteristic are equal to replacement; And these are revised or replacement, do not make the scope of the essence disengaging various embodiments of the present invention technical scheme of relevant art scheme.
Claims (8)
1. the control system of a mesohigh frequency converter is characterized in that, comprising: first main control chip, control unit, second main control chip and power cell;
Said first main control chip is connected with said control unit, is used for the inversion modulating wave instruction of V/F or vector control is sent to said control unit;
Said control unit; Be connected with said first main control chip, second main control chip and each said power cell respectively; Be used for inversion modulating wave instruction, the carrier wave after modulating wave and the setting is compared, generate the pulse width modulation (PWM) ripple of each said power cell according to said V/F or vector control; And said PWM ripple sent to corresponding said each power cell, to realize the V/F control or the vector control of motor;
Said second main control chip is connected with said control unit, is used to send logic control and orders to said control unit;
Said control unit also is used for said logic control order is sent to said power cell, to realize the logic control to said motor.
2. the control system of mesohigh frequency converter according to claim 1 is characterized in that, said control unit comprises:
Said dual port RAM module is connected with said second main control chip with said first main control chip, is used to realize the data high-speed communication between said first main control chip and said second main control chip;
The unit information processing module is connected with said second main control chip respectively, is used to receive the operating state signal of said each power cell, and said operating state signal is sent to said second main control chip; And reception is ordered from the control logic to motor that said second main control chip sends;
PWM ripple generating module; Be connected with said first main control chip; Be used to receive the said V/F that said first main control chip sends or the inversion modulating wave instruction of vector control, and according to the inversion modulating wave instruction of said V/F or vector control, the carrier wave of said modulating wave and said setting is compared; Generate the PWM ripple of said each said power cell, and the PWM ripple of said each said power cell is exported;
Communications Processor Module; Be connected with said each power cell with said unit information processing module, said PWM ripple generating module respectively; The operating state signal of said each power cell that is used for receiving is transmitted to said unit information processing module, and the PWM ripple and the said logic control instruction of said each said power cell sent to said each power cell.
3. the control system of mesohigh frequency converter according to claim 1 and 2 is characterized in that, said second main control chip also is used for process user control IO signal, system's control IO signal and analog input output signal; Receive the input voltage and the input current of said frequency converter; User's man-machine interface is provided and carries out data communication with host computer.
4. the control system of mesohigh frequency converter according to claim 1 and 2 is characterized in that, said first main control chip also is used to gather output voltage, output current and the motor speed feedback signal of said frequency converter;
Then said first main control chip also is used for obtaining vector operation according to said output voltage and output current, and according to said vector operation, obtains the inversion modulating wave instruction of said vector control; According to said motor speed feedback signal, generate the motor speed instruction, and said motor speed instruction is sent to said control unit;
Said control unit also is used for said motor speed instruction is sent to corresponding said each power cell, to realize rotating speed of motor control.
5. the control method of a mesohigh frequency converter is characterized in that, comprising:
First main control chip sends to control unit with the inversion modulating wave instruction of said V/F or vector control;
Said control unit is according to the inversion modulating wave instruction of said V/F or vector control; The carrier wave of modulating wave and setting is compared; Generate the pulse width modulation (PWM) ripple of each said power cell; And said PWM ripple sent to corresponding said each power cell, to realize the V/F control or the vector control of motor;
Said second main control chip sends logic control and orders to said control unit;
Said control unit sends to said power cell with said logic control order, to realize the logic control to said motor.
6. the control method of mesohigh frequency converter according to claim 5 is characterized in that, carries out data high-speed communication through the dual port RAM module in the said control unit between said first main control chip and said second main control chip.
7. according to the control method of claim 5 or 6 described mesohigh frequency converters, it is characterized in that, also comprise:
Said second main control chip process user control IO signal, system's control IO signal and analog input output signal; Receive the input voltage and the input current of said frequency converter; User's man-machine interface is provided and carries out data communication with host computer.
8. the control method of mesohigh frequency converter according to claim 7 is characterized in that, also comprises:
Said first main control chip is gathered output voltage, output current and the motor speed feedback signal of said frequency converter;
Then the acquisition process of the inversion modulating wave of said vector control instruction is:
According to said output voltage and output current, obtain vector operation, and, obtain the inversion modulating wave instruction of said vector control according to said vector operation;
And said method also comprises:
Said first main control chip generates the motor speed instruction according to said motor speed feedback signal, and said motor speed instruction is sent to said control unit;
Said control unit sends to corresponding said each power cell with said motor speed instruction, to realize rotating speed of motor control.
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| CN102981438A (en) * | 2012-12-10 | 2013-03-20 | 哈尔滨九洲电气股份有限公司 | Multi-power-unit tandem FPGA control device and control method for chain type SVG |
| CN103078563A (en) * | 2013-01-07 | 2013-05-01 | 安徽颐和新能源科技股份有限公司 | Software implementation method for starting runaway of high voltage inverter at fixed frequency |
| CN105356820A (en) * | 2015-12-08 | 2016-02-24 | 武汉大禹电气有限公司 | Middle and high voltage frequency conversion speed regulation double CPU control system and control method thereof |
| CN105743336A (en) * | 2014-12-10 | 2016-07-06 | 沈阳远大电力电子科技有限公司 | Cascade type high voltage frequency converter and main control system thereof |
| CN106505832A (en) * | 2016-11-11 | 2017-03-15 | 大禹电气科技股份有限公司 | A kind of high voltage transducer power unit control system and method based on CPLD |
| WO2018209637A1 (en) * | 2017-05-18 | 2018-11-22 | 深圳市海浦蒙特科技有限公司 | Positioning control method and system for machine tool spindle |
| CN113676069A (en) * | 2021-09-08 | 2021-11-19 | 新风光电子科技股份有限公司 | Parallel circulating current restraining method for cascaded high-voltage frequency converter |
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| CN106505832A (en) * | 2016-11-11 | 2017-03-15 | 大禹电气科技股份有限公司 | A kind of high voltage transducer power unit control system and method based on CPLD |
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| CN110235068A (en) * | 2017-05-18 | 2019-09-13 | 深圳市海浦蒙特科技有限公司 | The position control method and system of machine tool chief axis |
| CN113676069A (en) * | 2021-09-08 | 2021-11-19 | 新风光电子科技股份有限公司 | Parallel circulating current restraining method for cascaded high-voltage frequency converter |
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