CN113346824A - Motor controller bus voltage limiting and protecting method - Google Patents
Motor controller bus voltage limiting and protecting method Download PDFInfo
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- CN113346824A CN113346824A CN202110615461.XA CN202110615461A CN113346824A CN 113346824 A CN113346824 A CN 113346824A CN 202110615461 A CN202110615461 A CN 202110615461A CN 113346824 A CN113346824 A CN 113346824A
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- bus voltage
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000009466 transformation Effects 0.000 claims abstract description 4
- 238000003745 diagnosis Methods 0.000 claims description 6
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/0004—Control strategies in general, e.g. linear type, e.g. P, PI, PID, using robust control
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
A method for limiting and protecting bus voltage of a motor controller comprises the following steps: the voltage limiting module, the singlechip, the memory EEPROM and the bus voltage U are connected; the voltage limiting module comprises a voltage limiting threshold value and a filter a, bus voltage U is subjected to PI control through the filter a to obtain bus voltage Udc1, the voltage limiting threshold value and the bus voltage Udc1 are subjected to PI control to output generating current Ireg, the single chip microcomputer obtains the generating current Ireg output by the voltage limiting module to perform vector transformation to drive the inverter to control the motor to operate, the bus voltage U is subjected to bus voltage Udc2 through the filter 2 to obtain bus voltage Uuc2, the bus voltage Uuc2 is stored in a memory EEPROM, the memory EEPROM is connected with the single chip microcomputer, an overvoltage threshold value 1 and an overvoltage threshold value 2 are set on the single chip microcomputer, and the single chip microcomputer judges the overvoltage threshold value 1 and the overvoltage threshold value 2 according to the bus voltage Udc2 to obtain a reset code and a motor control instruction. After the single chip microcomputer is reset, the overvoltage fault can be identified again according to the bus voltage Udc2 recorded before resetting, and the purpose of voltage limiting is achieved by adjusting the generated current through PI without overvoltage protection.
Description
Technical Field
The invention relates to the field of voltage protection of a motor controller, in particular to a method for limiting and protecting bus voltage of the motor controller.
Background
The motor or the motor controller can be damaged due to overvoltage of a bus of the motor controller, and the following mode is adopted for protecting the bus voltage of the motor controller in the traditional method:
1. identifying an overvoltage fault and shutting down when the actual bus voltage is greater than a set threshold is a common handling method
The method has the disadvantages that when the bus voltage rises rapidly and overvoltage faults are not identified, the auxiliary power supply resets due to overvoltage stop working, and frequent resetting causes that site construction personnel cannot identify specific fault codes, thereby increasing maintenance time and maintenance difficulty
2. Partial proposal provides, sets up 2 grades of generating line overvoltage threshold, closes the motor controller electricity generation output when the busbar voltage is greater than one grade of threshold, restarts the electricity generation output when the busbar voltage drops to one grade of threshold, if the voltage sampling is inaccurate or the actual condition is complicated the motor shake easily appears and influences the serious person of performance and damages the motor control system.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a method for limiting and protecting the bus voltage of a motor controller.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
a method for limiting and protecting bus voltage of a motor controller comprises the following steps:
the voltage limiting module, the singlechip, the memory EEPROM and the bus voltage U are connected;
the voltage limiting module comprises a voltage limiting threshold value and a filter a, the bus voltage U is filtered by the filter a to obtain a bus voltage Udc1, the voltage limiting threshold and the bus voltage Udc1 perform PI control to output the generating current Ireg, the single chip acquires the generating current Ireg output by the voltage limiting module, carries out vector transformation to drive the inverter to control the motor to operate, obtains bus voltage Udc2 through the filter 2 by the bus voltage U, obtains bus voltage Uuc2 and stores the bus voltage in the memory EEPROM, the memory EEPROM is connected with a singlechip, the singlechip is provided with an overvoltage threshold value 1 and an overvoltage threshold value 2, the single chip microcomputer is provided with a fault diagnosis module, the single chip microcomputer judges the overvoltage threshold value 1 and the overvoltage threshold value 2 according to the bus voltage Udc2 to obtain a reset code and a motor control instruction, the fault diagnosis module outputs a fault identification code to the single chip microcomputer according to the reset code, and the single chip microcomputer stores the fault identification code and the reset code to the memory EEPROM.
Further, the single chip microcomputer executes the following operations after being reset:
s1: the single chip microcomputer reads a reset code through a memory EEPROM, the reset code is set to be 0 or 1, when the reset code is 1, the single chip microcomputer is abnormal reset, the single chip microcomputer reads bus voltage Udc2 stored before reset, the single chip microcomputer judges whether the bus voltage Udc2 is larger than an overvoltage threshold value 1, if the bus voltage Udc2 is larger than the overvoltage threshold value 1, overvoltage fault a is diagnosed and stored in the memory EEPROM, otherwise, if the bus voltage Udc2 is not larger than the overvoltage threshold value 1, the next operation is directly carried out;
s2: the single chip microcomputer reads a voltage limiting threshold and bus voltage Udc1, the voltage limiting threshold is used as a target quantity of PI control, bus voltage Udc1 is used as an input quantity of the PI control to carry out PI regulation, the PI control outputs generation current Ireg and outputs the generation current Ireg to the single chip microcomputer, the single chip microcomputer drives an inverter to control a motor to operate, and meanwhile the single chip microcomputer stores the bus voltage Udc2 into a memory EEPROM;
s3: the single chip microcomputer reads the bus voltage Udc2, whether the bus voltage Udc2 is larger than an overvoltage threshold value 2 or not is judged, when the bus voltage Udc2 is larger than the overvoltage threshold value 2, a reset code is set to be 0, meanwhile, an overvoltage fault 2 is stored in a storage EEPROM, the inverter drive is closed to prevent the inverter from being damaged, and when the Udc2 is not larger than the overvoltage threshold value 2, the PI control in the step S2 is continued to output the generated current Ireg to the single chip microcomputer to drive the inverter to control the motor to operate.
Further, the PI adjustment operation in step S2 is as follows:
a. when Ireg is 0, the limit Ireg is 0, i.e.: ireg ═ 0;
b. when Ireg >0 and Ireg < Imax, directly outputting Ireg to the singlechip;
c. when Ireg > Imax, the limit Ireg is Imax, i.e.: ireg is Imax, where Imax is the maximum generation current allowed by the inverter.
Further, the cut-off frequency of the filter 2 is higher than the cut-off frequency of the filter 1.
Further, the overpressure threshold 2 is greater than the overpressure threshold 1.
The invention has the beneficial effects that:
the invention has simple structure, can record the bus voltage Udc2 in real time and store the bus voltage Udc2 in the memory EEPROM, even if the auxiliary power supply stops working due to the rapid rise of the bus voltage, the single chip microcomputer can identify the overvoltage fault again according to the bus voltage Udc2 data recorded before the reset, and the PI control system is used to adjust the generating current by adjusting the PI parameter to achieve the purpose of limiting the voltage without overvoltage protection.
Drawings
FIG. 1 is a view of the connection structure of the present invention;
FIG. 2 is a control diagram of the motor controller bus voltage limiting and protection logic of the present invention;
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.
Example 1
As shown in fig. 1-2; a method for limiting and protecting bus voltage of a motor controller comprises the following steps:
the voltage limiting module 3, the singlechip 4, the memory EEPROM and the bus voltage U;
the voltage limiting module 3 comprises a voltage limiting threshold 5 and a filter a, bus voltage U is obtained through the filter a to obtain bus voltage Udc1, the voltage limiting threshold 5 and the bus voltage Udc1 are subjected to PI control to output generating current Ireg, the singlechip 4 obtains the generating current Ireg output by the voltage limiting module 3 to perform vector transformation to drive the inverter 6 to control the motor to operate, the bus voltage U is obtained through the filter 2 to obtain bus voltage Udc2, the obtained bus voltage Uuc2 is stored in a memory EEPROM, the storage EEPROM is connected with the single chip microcomputer 4, the single chip microcomputer 4 is provided with an overvoltage threshold value 1 and an overvoltage threshold value 2, the single chip microcomputer 4 is provided with a fault diagnosis module 7, the single chip microcomputer 4 judges the overvoltage threshold value 1 and the overvoltage threshold value 2 according to bus voltage Udc2 to obtain a reset code and a motor control instruction, the fault diagnosis module 7 outputs a fault identification code to the single chip microcomputer 4 according to the reset code, and the single chip microcomputer 4 stores the fault identification code and the reset code to the storage EEPROM.
The bus voltage Udc2 can be recorded in real time and stored in the memory EEPROM, even if the auxiliary power supply stops working due to the fact that the bus voltage rises rapidly, the single chip microcomputer 4 can recognize overvoltage faults again according to the bus voltage Udc2 data recorded before resetting after resetting, and the purpose of limiting voltage is achieved by adjusting PI parameters through the PI control system without overvoltage protection.
Example 2
On the basis of example 1, as shown in FIGS. 1-2; the singlechip 4 executes the following operations after resetting:
s1: the single chip microcomputer 4 reads a reset code through a memory EEPROM, the reset code is set to be 0 or 1, when the reset code is 1, abnormal reset is performed, the single chip microcomputer 4 reads bus voltage Udc2 stored before reset, the single chip microcomputer 4 judges whether the bus voltage Udc2 is larger than an overvoltage threshold value 1, if the bus voltage Udc2 is larger than the overvoltage threshold value 1, an overvoltage fault a is diagnosed and stored in the memory EEPROM, otherwise, if the bus voltage Udc2 is not larger than the overvoltage threshold value 1, the next operation is directly performed;
s2: the single chip microcomputer 4 reads the voltage limiting threshold 5 and the bus voltage Udc1, the voltage limiting threshold 5 is used as a target quantity of PI control, the bus voltage Udc1 is used as an input quantity of the PI control to carry out PI regulation, the PI control outputs a generating current Ireg and outputs the generating current Ireg to the single chip microcomputer 4, the single chip microcomputer 4 drives the inverter 6 to control the motor to operate, and meanwhile, the single chip microcomputer 4 stores the bus voltage Udc2 into a memory EEPROM;
s3: when the motor controller generates power, step S2 can limit the bus voltage to the voltage limiting threshold 5 without overvoltage occurring;
when the motor controller works in a non-power generation mode, the single chip microcomputer 4 reads bus voltage Udc2, judges whether the bus voltage Udc2 is larger than an overvoltage threshold value 2, sets a reset code to be 0 when the bus voltage Udc2 is larger than the overvoltage threshold value 2, simultaneously stores the overvoltage fault 2 in a memory EEPROM, closes the inverter 6 to prevent the inverter 6 from being damaged, and continues PI control in step S2 to output power generation current Ireg to the single chip microcomputer 4 to drive the inverter 6 to control the motor to run when the Udc2 is not larger than the overvoltage threshold value 2.
When the bus voltage of the motor controller is abnormally and rapidly increased and the auxiliary power supply of the motor controller is protected to be short of identifying the overvoltage fault 2 instantly, the single chip microcomputer 4 can not identify the overvoltage fault 2 but can real-timely maintain the bus voltage Udc2 so that the single chip microcomputer 4 can perform secondary judgment after being reset, and the specific judgment method is S1 and S2;
the PI adjustment operation in step S2 is as follows:
a. when Ireg is 0, the limit Ireg is 0, i.e.: ireg ═ 0;
b. when Ireg >0 and Ireg < Imax, directly outputting Ireg to the singlechip 4;
c. when Ireg > Imax, the limit Ireg is Imax, i.e.: ireg is Imax, which is the maximum generation current allowed by the inverter 6.
The cut-off frequency of filter 2 is higher than the cut-off frequency of filter 1.
The bus voltage Udc1 is used for PI regulation, so that the bus voltage Udc1 is required to have high real-time performance, and the bus voltage Udc2 is directly used for judging that overvoltage faults require high stability, so that the overvoltage threshold 2 is set to be larger than the overvoltage threshold 1.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A method for limiting and protecting bus voltage of a motor controller is characterized by comprising the following steps:
the voltage limiting module, the singlechip, the memory EEPROM and the bus voltage U are connected;
the voltage limiting module comprises a voltage limiting threshold value and a filter a, the bus voltage U is filtered by the filter a to obtain a bus voltage Udc1, the voltage limiting threshold and the bus voltage Udc1 perform PI control to output the generating current Ireg, the single chip acquires the generating current Ireg output by the voltage limiting module, carries out vector transformation to drive the inverter to control the motor to operate, obtains bus voltage Udc2 through the filter 2 by the bus voltage U, obtains bus voltage Uuc2 and stores the bus voltage in the memory EEPROM, the memory EEPROM is connected with a singlechip, the singlechip is provided with an overvoltage threshold value 1 and an overvoltage threshold value 2, the single chip microcomputer is provided with a fault diagnosis module, the single chip microcomputer judges the overvoltage threshold value 1 and the overvoltage threshold value 2 according to the bus voltage Udc2 to obtain a reset code and a motor control instruction, the fault diagnosis module outputs a fault identification code to the single chip microcomputer according to the reset code, and the single chip microcomputer stores the fault identification code and the reset code to the memory EEPROM.
2. The method for limiting and protecting the bus voltage of the motor controller according to claim 1, wherein the single chip microcomputer executes the following operations after being reset:
s1: the single chip microcomputer reads a reset code through a memory EEPROM, the reset code is set to be 0 or 1, when the reset code is 1, the single chip microcomputer is abnormal reset, the single chip microcomputer reads bus voltage Udc2 stored before reset, the single chip microcomputer judges whether the bus voltage Udc2 is larger than an overvoltage threshold value 1, if the bus voltage Udc2 is larger than the overvoltage threshold value 1, overvoltage fault a is diagnosed and stored in the memory EEPROM, otherwise, if the bus voltage Udc2 is not larger than the overvoltage threshold value 1, the next operation is directly carried out;
s2: the single chip microcomputer reads a voltage limiting threshold and bus voltage Udc1, the voltage limiting threshold is used as a target quantity of PI control, bus voltage Udc1 is used as an input quantity of the PI control to carry out PI regulation, the PI control outputs generation current Ireg and outputs the generation current Ireg to the single chip microcomputer, the single chip microcomputer drives an inverter to control a motor to operate, and meanwhile the single chip microcomputer stores the bus voltage Udc2 into a memory EEPROM;
s3: the single chip microcomputer reads the bus voltage Udc2, whether the bus voltage Udc2 is larger than an overvoltage threshold value 2 or not is judged, when the bus voltage Udc2 is larger than the overvoltage threshold value 2, a reset code is set to be 0, meanwhile, an overvoltage fault 2 is stored in a storage EEPROM, the inverter drive is closed to prevent the inverter from being damaged, and when the Udc2 is not larger than the overvoltage threshold value 2, the PI control in the step S2 is continued to output the generated current Ireg to the single chip microcomputer to drive the inverter to control the motor to operate.
3. The method as claimed in claim 2, wherein the PI regulation operation in step S2 is as follows:
a. when Ireg is 0, the limit Ireg is 0, i.e.: ireg ═ 0;
b. when Ireg >0 and Ireg < Imax, directly outputting Ireg to the singlechip;
c. when Ireg > Imax, the limit Ireg is Imax, i.e.: ireg is Imax, where Imax is the maximum generation current allowed by the inverter.
4. The method as claimed in claim 1, wherein the cut-off frequency of the filter 2 is higher than the cut-off frequency of the filter 1.
5. The method of claim 1, wherein the over-voltage threshold 2 is greater than the over-voltage threshold 1.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110615461.XA CN113346824A (en) | 2021-06-02 | 2021-06-02 | Motor controller bus voltage limiting and protecting method |
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| CN202110615461.XA CN113346824A (en) | 2021-06-02 | 2021-06-02 | Motor controller bus voltage limiting and protecting method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103701127A (en) * | 2013-12-27 | 2014-04-02 | 国电南京自动化股份有限公司 | Novel active power filtering device and control method thereof |
| CN104348179A (en) * | 2014-11-06 | 2015-02-11 | 国网辽宁省电力有限公司鞍山供电公司 | Control method for light direct current transmission system |
| CN105644369A (en) * | 2014-11-13 | 2016-06-08 | 比亚迪股份有限公司 | Motor controller, and reset processing method and device thereof |
| CN108099624A (en) * | 2016-11-25 | 2018-06-01 | 郑州宇通客车股份有限公司 | A kind of new energy car battery guard method and device based on cell voltage |
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2021
- 2021-06-02 CN CN202110615461.XA patent/CN113346824A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103701127A (en) * | 2013-12-27 | 2014-04-02 | 国电南京自动化股份有限公司 | Novel active power filtering device and control method thereof |
| CN104348179A (en) * | 2014-11-06 | 2015-02-11 | 国网辽宁省电力有限公司鞍山供电公司 | Control method for light direct current transmission system |
| CN105644369A (en) * | 2014-11-13 | 2016-06-08 | 比亚迪股份有限公司 | Motor controller, and reset processing method and device thereof |
| CN108099624A (en) * | 2016-11-25 | 2018-06-01 | 郑州宇通客车股份有限公司 | A kind of new energy car battery guard method and device based on cell voltage |
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