CN110323816B - Linear generator control method and device - Google Patents
Linear generator control method and device Download PDFInfo
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- CN110323816B CN110323816B CN201910568324.8A CN201910568324A CN110323816B CN 110323816 B CN110323816 B CN 110323816B CN 201910568324 A CN201910568324 A CN 201910568324A CN 110323816 B CN110323816 B CN 110323816B
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- battery
- thyristor
- linear generator
- boost chopper
- output current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/14—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
- H02J7/1469—Regulation of the charging current or voltage otherwise than by variation of field
- H02J7/1492—Regulation of the charging current or voltage otherwise than by variation of field by means of controlling devices between the generator output and the battery
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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
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
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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
- H02P2101/00—Special adaptation of control arrangements for generators
- H02P2101/40—Special adaptation of control arrangements for generators for railway vehicles
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/92—Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles
Abstract
The invention provides a method and a device for controlling a linear generator, wherein the actual control time for turning on and off a thyristor is calculated according to the acquired temperature value of a battery, the output current value of the linear generator, the voltage of each monomer of the battery and the continuous turn-on time of the thyristor of a boost chopper device, and then the chopping operation is carried out on the linear generator according to the calculated actual control time for turning on and off the thyristor.
Description
Technical Field
The invention relates to the technical field of automatic control, in particular to a linear generator control method and device.
Background
At present, a magnetic suspension train realizes contactless suspension and guidance between the train and a track through electromagnetic force, and then drives the train to run by utilizing the electromagnetic force generated by ground traction equipment. The electric energy consumed by the maglev train due to levitation during running is provided by a battery, and the electric quantity consumed by the battery is supplemented by a linear generator.
Generally, the controller of the linear generator only uses the output current as a control signal, and does not consider the charging capability of the battery. Therefore, the output voltage fluctuation range of the existing linear generator of the magnetic suspension train is large, and the charging efficiency is low.
Disclosure of Invention
In order to solve the above problems, embodiments of the present invention provide a method and an apparatus for controlling a linear generator.
In a first aspect, an embodiment of the present invention provides a linear generator control method, including:
acquiring a temperature value of the battery, an output current value of the linear generator, the voltage of each monomer of the battery and the continuous opening time of a thyristor of the boost chopper device;
when a thyristor of the boost chopper device is turned on, calculating the actual voltage of the battery according to the sum of the voltages of all the single batteries;
determining the optimal charging time of the battery under the output current value of the linear generator according to the temperature value of the battery, the actual voltage of the battery and the output voltage of the capacitor;
calculating the actual control moment for closing the thyristor by comparing the output current of the linear generator with the closing threshold value of the thyristor of the boost chopper and by comparing the continuous opening time of the thyristor with the optimal charging time of the battery when the thyristor of the boost chopper is opened;
when the thyristor of the boost chopper is turned off, the output current of the linear generator is compared with the thyristor turn-on threshold of the boost chopper, and when the output current of the linear generator is larger than the thyristor turn-on threshold of the boost chopper, the thyristor is turned on.
In a second aspect, an embodiment of the present invention further provides a linear generator control apparatus, including:
the acquisition module is used for acquiring the temperature value of the battery, the output current value of the linear generator, the voltage of each monomer of the battery and the continuous opening time of a thyristor of the boost chopper device;
the first calculation module is used for calculating the actual voltage of the battery according to the sum of the voltages of all the single batteries when the thyristor of the boost chopper is turned on;
the second calculation module is used for determining the optimal charging time of the battery under the output current value of the linear generator according to the temperature value of the battery, the actual voltage of the battery and the output voltage of the capacitor;
the third calculation module is used for calculating the actual control time for opening and closing the thyristor by comparing the output current of the linear generator with the closing threshold value of the thyristor of the boost chopper device and comparing the continuous opening time of the thyristor with the optimal charging time of the battery when the thyristor of the boost chopper device is opened;
and the processing module is used for comparing the output current of the linear generator with the thyristor turn-on threshold of the boost chopper when the thyristor of the boost chopper is turned off, and turning on the thyristor when the output current of the linear generator is greater than the thyristor turn-on threshold of the boost chopper.
In the solutions provided in the first and second aspects of the embodiments of the present invention, the actual control time for turning on and off the thyristor is calculated according to the obtained temperature value of the battery, the output current value of the linear generator, the voltage of each cell of the battery, and the continuous on-time of the thyristor of the boost chopper device, and then the chopping operation is performed on the linear generator according to the calculated actual control time for turning on and off the thyristor, so as to control the output voltage of the linear generator. The linear generator control process in the invention takes the battery charging performance into consideration, and takes the change rate of the battery temperature as a variable to participate in the linear generator control process, thereby improving the battery charging efficiency. The invention meets the power supply performance requirement of the maglev train, and greatly improves the stability of the output voltage of the linear generator and the efficiency of charging the battery.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart illustrating a linear generator control method according to embodiment 1 of the present invention;
fig. 2 is a schematic diagram of a linear generator in a method for controlling a linear generator according to embodiment 1 of the present invention;
fig. 3 is a schematic structural diagram illustrating a linear generator control device according to embodiment 2 of the present invention.
Detailed Description
Currently, a magnetic levitation train is provided with a controller for controlling a linear generator. The controller of the traditional linear generator adopts the output current as a control signal, so that in the working process of the linear generator, the output voltage of the linear generator can be controlled only after the actual output current of the linear generator is greater than a current threshold value, so that the fluctuation range of the output voltage of the linear generator is large, and the power generation efficiency is low. In addition, the charging performance of the battery is not considered, so that the charging efficiency of the linear generator to the battery is low.
Based on the above, the method and the device for controlling the linear generator provided by the embodiment of the application obtain the temperature value of the battery, the output current value of the linear generator, the voltage of each single battery and the continuous turn-on time of the thyristor of the boost chopper device; when the thyristor of the boost chopper device is switched off, calculating the actual voltage of the battery according to the sum of the voltages of all the single batteries; determining the optimal charging time of the battery under the output current value of the linear generator according to the temperature value of the battery, the actual voltage of the battery and the output voltage of the capacitor; the output current of the linear generator is compared with the opening and closing threshold values of the thyristor of the boost chopper, the continuous opening time of the thyristor is compared with the optimal charging time of the battery when the thyristor of the boost chopper is opened, the actual control time for opening and closing the thyristor is calculated, then the output voltage of the linear generator is operated according to the calculated actual control time for opening and closing the thyristor, and the charging efficiency of the battery is guaranteed.
Example 1
Referring to a flowchart of a linear generator control method shown in fig. 1, the present embodiment proposes a linear generator control method in which an execution subject is a controller of a linear generator.
The controller may be any processor, microprocessor and single chip microcomputer capable of controlling the linear generator in the prior art, and details are not repeated here.
The method for controlling the linear generator provided by the embodiment comprises the following specific steps:
and step 100, acquiring a temperature value of the battery, an output current value of the linear generator, the voltage of each single battery and the continuous opening time of a thyristor of the boost chopper device.
In the above step 100, the battery is the battery in the schematic diagram of the linear generator shown in fig. 2. The temperature value of the battery can be measured by a temperature sensor connected with the controller, and the temperature sensor can transmit the measured temperature value to the controller.
The cell voltages of the battery, that is, the voltages of the cells constituting the battery in fig. 2, can be obtained by measurement.
The output current value of the linear generator can be obtained through measurement.
The continuous opening time of the thyristor of the boost chopper device can be measured through a crystal oscillator in the controller when the thyristor is opened.
And 102, when the thyristors of the boost chopper device are turned on, calculating the actual voltage of the battery according to the sum of the voltages of all the single batteries.
Of course, the actual voltage of the battery may also be a preset value, or an initial voltage value of the battery of the levitated object including the magnetic levitation train before departure.
Those skilled in the art will appreciate that the actual voltage of a battery is related to the complex physicochemical reactions therein.
And 104, determining the optimal charging time of the battery under the output current value of the linear generator according to the temperature value of the battery, the actual voltage of the battery and the output voltage of the capacitor.
In step 104, in order to determine the optimal charging time of the battery under the current, the optimal charging time of the battery under the output current value of the linear generator may be searched in the battery charging characteristic diagram according to the temperature value of the battery, the output current value of the linear generator, the actual voltage of the battery and the output voltage of the capacitor.
The battery charging characteristic diagram is stored in the controller in advance, and the corresponding relation among the actual voltage of the battery, the output voltage of the capacitor, the output current value of the linear generator and the optimal charging time of the battery is preset. Therefore, the optimal charging time corresponding to the battery actual voltage and the capacitor output voltage can be inquired in the battery charging characteristic diagram through the battery actual voltage, the linear generator output current value and the capacitor output voltage.
The battery charging characteristic diagram is obtained by drawing through a ground bench test, and the test purpose is to obtain how long the battery is charged under different charging currents ((charging voltage-battery voltage)/internal resistance of the battery) under different battery voltages (equal to actual voltages before charging the battery) and different charging voltages (equal to capacitor output voltages in the text), so that the optimal charging efficiency of the battery can be obtained.
The battery charging characteristic map may be generated experimentally according to different optimal charging methods, including but not limited to optimal characteristic maps generated by a variable current optimal charging method, a variable voltage optimal charging method, a Reflex fast charging method, and the like.
If the variable voltage optimal charging method is adopted, the battery charging characteristic diagram is the optimal charging efficiency at different charging voltages (charging voltage-battery voltage) and different times. In the invention, the current optimal charging efficiency is searched by adopting (charging voltage-battery voltage), and the optimal charging time is further determined;
if the variable current optimal charging method is adopted, the battery charging characteristic diagram is the optimal charging efficiency under different charging currents and different time. In the invention, (charging voltage-battery voltage)/battery internal resistance is adopted to search the current optimal charging efficiency, thereby determining the optimal charging time;
if the Reflex rapid charging method is used, the battery discharge process is omitted, since the power supply of the levitation electromagnet, including the levitated object within the maglev train, is provided by the battery, instead of the discharge process. The charging process is the combination of a variable voltage optimal charging method and a variable current optimal charging method, and the corresponding control efficiency can be selected to obtain the optimal charging time of the battery only by obtaining the voltage and the current under the optimal charging efficiency according to the test.
And 106, comparing the output current of the linear generator with a thyristor closing threshold of the boost chopper, and comparing the continuous opening time of the thyristor with the optimal charging time of the battery when the thyristor of the boost chopper is opened, so as to calculate the actual control time for opening and closing the thyristor.
Here, when the current state of the thyristor of the boost chopper device is on, the difference value between the optimal charging time of the battery and the continuous on-time of the thyristor is less than the preset time length, or the output current of the linear generator is less than the minimum threshold value for turning off the thyristor of the boost chopper device, the thyristor is turned off.
And 108, when the thyristor of the boost chopper is closed, comparing the output current of the linear generator with the thyristor opening threshold of the boost chopper, and when the output current of the linear generator is greater than the thyristor opening threshold of the boost chopper, opening the thyristor.
In summary, according to the method for controlling the linear generator provided in this embodiment, the actual control time for turning on and off the thyristor is calculated according to the obtained temperature value of the battery, the output current value of the linear generator, the voltage of each cell of the battery, and the continuous on-time of the thyristor of the boost chopper device, and then the chopping operation is performed on the linear generator according to the calculated actual control time for turning on and off the thyristor, so as to control the output voltage of the linear generator. The linear generator control process in the invention takes the battery charging performance into consideration, and takes the change rate of the battery temperature as a variable to participate in the linear generator control process, thereby improving the battery charging efficiency. The invention meets the power supply performance requirement of the maglev train, and greatly improves the stability of the output voltage of the linear generator and the efficiency of charging the battery.
Example 2
Referring to a schematic structural diagram of a linear generator control device shown in fig. 3, the present embodiment proposes a linear generator control device, including:
the acquisition module 300 is used for acquiring a temperature value of the battery, an output current value of the linear generator, voltages of all the single batteries of the battery and the continuous on-time of a thyristor of the boost chopper device;
the first calculating module 302 is used for calculating the actual voltage of the battery according to the sum of the voltages of all the single batteries when the thyristors of the boost chopper device are turned on;
the second calculation module 304 is configured to determine an optimal charging time of the battery at the output current value of the linear generator according to the temperature value of the battery, the actual voltage of the battery, and the output voltage of the capacitor;
the third calculating module 306 is used for calculating the actual control time for turning on and off the thyristor by comparing the output current of the linear generator with the thyristor turn-off threshold of the boost chopper and comparing the continuous turn-on time of the thyristor with the optimal charging time of the battery when the thyristor of the boost chopper is turned on;
and the processing module 308 is configured to, when the thyristor of the boost chopper is turned off, compare the output current of the linear generator with the thyristor turn-on threshold of the boost chopper, and turn on the thyristor when the output current of the linear generator is greater than the thyristor turn-on threshold of the boost chopper.
In summary, according to the control device of the linear generator provided in this embodiment, the actual control time for turning on and off the thyristor is calculated according to the obtained temperature value of the battery, the output current value of the linear generator, the voltage of each cell of the battery, and the continuous on-time of the thyristor of the boost chopper device, and then the chopping operation is performed on the linear generator according to the calculated actual control time for turning on and off the thyristor, so as to control the output voltage of the linear generator. The linear generator control process in the invention takes the battery charging performance into consideration, and takes the change rate of the battery temperature as a variable to participate in the linear generator control process, thereby improving the battery charging efficiency. The invention meets the power supply performance requirement of the maglev train, and greatly improves the stability of the output voltage of the linear generator and the efficiency of charging the battery.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. A linear generator control method for a magnetic levitation train linear generator, comprising:
acquiring a temperature value of the battery, an output current value of the linear generator, the voltage of each monomer of the battery and the continuous opening time of a thyristor of the boost chopper device;
when a thyristor of the boost chopper device is turned on, calculating the actual voltage of the battery according to the sum of the voltages of all the single batteries of the battery;
determining the optimal charging time of the battery under the output current value of the linear generator according to the temperature value of the battery, the actual voltage of the battery and the output voltage of the capacitor; the output end of the linear generator is connected with the input end of the boost chopper device, and the output end of the boost chopper device is also connected with the battery; the capacitor is connected with the battery in parallel;
calculating the actual control moment for closing the thyristor by comparing the output current of the linear generator with the closing threshold value of the thyristor of the boost chopper device and by comparing the continuous opening time of the thyristor with the optimal charging time of the battery when the thyristor of the boost chopper device is opened;
when the thyristor of the boost chopper is turned off, the output current of the linear generator is compared with the thyristor turn-on threshold of the boost chopper, and when the output current of the linear generator is larger than the thyristor turn-on threshold of the boost chopper, the thyristor is turned on.
2. The method of claim 1, wherein determining the optimal charging time of the battery at the output current value of the linear generator according to the temperature value of the battery, the actual voltage of the battery and the output voltage of the capacitor comprises:
and inquiring the optimal charging time of the battery under the output current value of the linear generator in a battery charging characteristic diagram according to the temperature value of the battery, the output current value of the linear generator, the actual voltage of the battery and the output voltage of the capacitor.
3. The method of claim 1, wherein calculating the actual control time to turn off the thyristor by comparing the linear generator output current to a boost chopper thyristor turn-off threshold and by comparing the duration of the thyristor on time to the optimal charge time of the battery when the boost chopper thyristor is turned on, further comprises:
and when the current state of the thyristor of the boost chopper device is on, the difference value between the optimal charging time of the battery and the continuous on-time of the thyristor is less than the preset time length or the output current of the linear generator is less than the turn-off threshold value of the thyristor of the boost chopper device, the thyristor is turned off.
4. A linear generator control apparatus for a maglev train linear generator, comprising:
the acquisition module is used for acquiring the temperature value of the battery, the output current value of the linear generator, the voltage of each monomer of the battery and the continuous opening time of a thyristor of the boost chopper device;
the first calculation module is used for calculating the actual voltage of the battery according to the sum of the voltages of all the single batteries when the thyristor of the boost chopper is turned on;
the second calculation module is used for determining the optimal charging time of the battery under the output current value of the linear generator according to the temperature value of the battery, the actual voltage of the battery and the output voltage of the capacitor; the output end of the linear generator is connected with the input end of the boost chopper device, and the output end of the boost chopper device is also connected with the battery; the capacitor is connected with the battery in parallel;
the third calculation module is used for comparing the output current of the linear generator with a thyristor closing threshold value of the boost chopper device, and comparing the continuous opening time of the thyristor with the optimal charging time of the battery when the thyristor of the boost chopper device is opened, so as to calculate the actual control time for closing the thyristor;
and the processing module is used for comparing the output current of the linear generator with the thyristor turn-on threshold of the boost chopper when the thyristor of the boost chopper is turned off, and turning on the thyristor when the output current of the linear generator is greater than the thyristor turn-on threshold of the boost chopper.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103921641A (en) * | 2014-04-29 | 2014-07-16 | 江苏大学 | Energy feedback suspension system and control method |
| CN103986209A (en) * | 2014-05-23 | 2014-08-13 | 安徽江淮汽车股份有限公司 | Automotive storage battery charging system and method |
| KR20190012283A (en) * | 2017-07-26 | 2019-02-11 | 전남대학교산학협력단 | A control system for battery charging by generator rotational speed control and generator system having the control system |
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- 2019-06-27 CN CN201910568324.8A patent/CN110323816B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103921641A (en) * | 2014-04-29 | 2014-07-16 | 江苏大学 | Energy feedback suspension system and control method |
| CN103986209A (en) * | 2014-05-23 | 2014-08-13 | 安徽江淮汽车股份有限公司 | Automotive storage battery charging system and method |
| KR20190012283A (en) * | 2017-07-26 | 2019-02-11 | 전남대학교산학협력단 | A control system for battery charging by generator rotational speed control and generator system having the control system |
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