CN111162696A - Chopping control method and device - Google Patents
Chopping control method and device Download PDFInfo
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- CN111162696A CN111162696A CN201811325367.5A CN201811325367A CN111162696A CN 111162696 A CN111162696 A CN 111162696A CN 201811325367 A CN201811325367 A CN 201811325367A CN 111162696 A CN111162696 A CN 111162696A
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- 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
- H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
- H02P5/46—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors for speed regulation of two or more dynamo-electric motors in relation to one another
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Abstract
The invention provides a chopping control method and a chopping control device. The method comprises the following steps: periodically detecting the voltage of an intermediate direct current bus, wherein the voltage of the intermediate direct current bus is the voltage of a direct current bus on the alternating current-direct current power transmission locomotive; when the detected voltage value of the middle direct-current bus is larger than the chopping upper limit threshold value, a P regulator is adopted to regulate the voltage of the middle direct-current bus; and until the detected voltage value of the intermediate direct-current bus is smaller than a chopping lower limit threshold value, the chopping upper limit threshold value is larger than the chopping lower limit threshold value. Compared with the prior art, the impact on the intermediate direct current bus voltage is reduced.
Description
Technical Field
The invention relates to the technical field of automatic control, in particular to a chopping control method and a chopping control device.
Background
As a novel traction transmission system, compared with the traditional traction transmission system, the direct-drive permanent magnet alternating current transmission system has a series of advantages of wide efficient operation range, simple transmission structure, high transmission efficiency, less maintenance workload, energy conservation and emission reduction, small volume, low noise and the like, and is a key focus field for implementing the established national policy of energy conservation and emission reduction in China. At present, the main topology of the direct-drive permanent magnet alternating current transmission system adopts an alternating current-direct current-alternating current main topology structure, and the control of the intermediate direct current bus voltage plays a key role in controlling the direct-drive permanent magnet motor.
In the prior art, a chopping control method of intermediate direct-current bus voltage adopts hysteresis control. However, this control method has low control accuracy and has a large impact on the dc bus voltage.
Disclosure of Invention
The invention provides a chopping control method and a chopping control device. The method is used for solving the problem that the direct current bus voltage impact is large in the prior art.
In a first aspect, the present invention provides a chopper control method for an ac-dc-ac electric-driven locomotive, including:
periodically detecting the voltage of an intermediate direct current bus, wherein the voltage of the intermediate direct current bus is the voltage of a direct current bus on the alternating current-direct current power transmission locomotive;
when the detected voltage value of the middle direct-current bus is larger than the chopping upper limit threshold value, a P regulator is adopted to regulate the voltage of the middle direct-current bus; and until the detected voltage value of the intermediate direct-current bus is smaller than a chopping lower limit threshold value, the chopping upper limit threshold value is larger than the chopping lower limit threshold value.
Optionally, the adjusting the voltage of the intermediate dc bus by using the P adjuster includes:
determining a chopping duty ratio in a target detection period by using the P regulator; the target detection period includes: the detection period from the time when the detected voltage value of the middle direct-current bus is larger than the chopping upper limit threshold value to the time when the detected voltage value of the middle direct-current bus is smaller than the chopping lower limit threshold value;
determining the turn-on time of the chopper tube in a target detection period according to the chopping duty ratio;
and controlling the chopping tube to be switched on or off according to the switching-on time so as to reduce the voltage value of the intermediate direct-current bus to be smaller than the chopping lower limit threshold value.
Optionally, the method further includes:
and when the voltage value of the intermediate direct-current bus is smaller than the chopping lower limit threshold value, the chopping tube is controlled to be turned off.
Optionally, before determining the chopping duty cycle in the target detection period by using the P regulator, the method further includes:
determining a target parameter according to the following formula;
Err-U1-chopper lower threshold
Wherein Err represents a target parameter, and U1 represents a middle dc bus voltage value detected in a target detection period;
correspondingly, the determining the chopping duty cycle in the target detection period by using the P regulator includes:
acquiring a control coefficient corresponding to the P regulator;
and determining the chopping duty cycle according to the control coefficient and the target parameter.
Optionally, the obtaining the control coefficient of the P regulator includes:
determining the control coefficient according to the following formula;
kp _ chp 1/(direct current bus voltage overvoltage protection threshold-chopping lower limit threshold)
Where Kp _ chp represents a control coefficient.
Optionally, the determining the chopping duty cycle according to the control coefficient and the target parameter includes:
determining the chopping duty cycle according to the following formula;
C_duty＝Err*Kp_chp
where C _ duty represents a chopping duty ratio, Err represents a target parameter, and Kp _ chp represents a control coefficient.
Optionally, the determining, according to the chopping duty cycle, that the on-time of the chopping tube in the target detection period is before, further includes:
and performing error proofing treatment on the chopping duty ratio.
Optionally, the performing error-proofing processing on the chopping duty cycle includes:
if the value of the chopping duty cycle is larger than 1, setting the value of the chopping duty cycle to 1;
and if the value of the chopping duty cycle is less than 0, setting the value of the chopping duty cycle to 0.
In a second aspect, the present invention provides a chopper control apparatus comprising:
the detection module is used for periodically detecting the voltage of an intermediate direct current bus, wherein the voltage of the intermediate direct current bus is the voltage of a direct current bus on the alternating current-direct current power transmission locomotive;
the processing module is used for adjusting the voltage of the middle direct-current bus by adopting a P adjuster when the detected voltage value of the middle direct-current bus is larger than a chopping upper limit threshold value; and until the detected voltage value of the intermediate direct-current bus is smaller than a chopping lower limit threshold value, the chopping upper limit threshold value is larger than the chopping lower limit threshold value.
Optionally, the first determining unit is configured to determine, by using the P regulator, a chopping duty cycle in a target detection period; the target detection period includes: the detection period from the time when the detected voltage value of the middle direct-current bus is larger than the chopping upper limit threshold value to the time when the detected voltage value of the middle direct-current bus is smaller than the chopping lower limit threshold value;
the second determining unit is used for determining the turn-on time of the chopper tube in the target detection period according to the chopping duty ratio;
and the control unit is used for controlling the on or off of the chopping tube according to the on time so as to enable the voltage value of the intermediate direct-current bus to be reduced to be smaller than the chopping lower limit threshold value.
Optionally, the apparatus further includes:
and the control module is used for controlling the chopper tube to be turned off when the voltage value of the intermediate direct-current bus is detected to be smaller than the chopping lower limit threshold value.
Optionally, the apparatus further includes:
a determination module for determining a target parameter according to the following formula;
Err-U1-chopper lower threshold
Wherein Err represents a target parameter, and U1 represents a middle dc bus voltage value detected in a target detection period;
optionally, the first determining unit is specifically configured to:
acquiring a control coefficient corresponding to the P regulator;
and determining the chopping duty cycle according to the control coefficient and the target parameter.
Optionally, the first determining unit is specifically configured to:
determining the control coefficient according to the following formula;
kp _ chp 1/(direct current bus voltage overvoltage protection threshold-chopping lower limit threshold)
Where Kp _ chp represents a control coefficient.
Optionally, the first determining unit is specifically configured to:
determining the chopping duty cycle according to the following formula;
C_duty＝Err*Kp_chp
where C _ duty represents a chopping duty ratio, Err represents a target parameter, and Kp _ chp represents a control coefficient.
Optionally, the processing module further includes:
and the error-proofing processing module is used for carrying out error-proofing processing on the chopping duty ratio.
Optionally, the error-proofing processing module is specifically configured to:
if the value of the chopping duty cycle is larger than 1, setting the value of the chopping duty cycle to 1;
and if the value of the chopping duty cycle is less than 0, setting the value of the chopping duty cycle to 0.
In a third aspect, the present invention provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the above-described chopping control method.
In a fourth aspect, the present invention provides a chopper control apparatus comprising:
a processor; and
a memory for storing executable instructions of the processor;
wherein the processor is configured to implement the above-described chopping control method via execution of the executable instructions.
The chopping control method and the device provided by the embodiment are applied to an AC-DC-AC electric drive locomotive, periodically detect the voltage of an intermediate DC bus, and adjust the voltage of the intermediate DC bus by adopting a P adjuster when the detected voltage value of the intermediate DC bus is greater than a chopping upper limit threshold value; and reducing the impact on the voltage of the intermediate direct-current bus until the detected voltage value of the intermediate direct-current bus is smaller than the chopping lower limit threshold value.
Drawings
Fig. 1 is a schematic flow chart of a chopping control method according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a main loop topology provided by the present invention;
fig. 3a is a schematic flowchart of a second embodiment of a chopping control method provided in the present invention;
fig. 3b is another schematic flow chart of a second embodiment of the chopping control method provided in the present invention;
fig. 4 is a schematic flowchart of a third embodiment of a chopping control method provided by the present invention;
fig. 5 is a schematic structural diagram of a first embodiment of a chopper control apparatus provided in the present invention;
fig. 6 is a schematic structural diagram of a second embodiment of the chopper control device provided in the present invention;
fig. 7 is a schematic diagram of a hardware structure of the chopper control device provided in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
For an ac-dc-ac power transmission locomotive, in the prior art, a hysteresis control method is adopted for controlling the voltage of an intermediate dc bus. The control principle of the hysteresis control method is as follows:
periodically detecting the voltage of the intermediate direct current bus; and judging whether the detected voltage value of the middle direct-current bus is greater than a chopping upper limit threshold value, if so, controlling the chopping tube to be in a turn-on state until the detected voltage value of the middle direct-current bus is less than a chopping lower limit threshold value.
Therefore, in the hysteresis control method, the chopper tube is always in the on state in the whole process that the voltage value of the intermediate direct-current bus is reduced from being larger than the chopping upper limit threshold value to being smaller than the chopping lower limit threshold value. The voltage value of the middle direct current bus has larger descending span and more obvious impact on the voltage of the middle direct current bus.
The invention provides a chopping control method and a chopping control device. The method comprises the steps of periodically detecting the voltage of the middle direct-current bus, and when the detected voltage value of the middle direct-current bus is larger than a chopping upper limit threshold value, adopting a P regulator to regulate the voltage of the middle direct-current bus, so that the voltage value of the middle direct-current bus slowly drops below the chopping lower limit threshold value.
The following describes the technical solutions of the present invention and how to solve the above technical problems with specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present invention will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic flow diagram of a first embodiment of a chopping control method provided in the present invention, and as shown in fig. 1, the chopping control method provided in this embodiment includes:
s101, periodically detecting the voltage of an intermediate direct current bus, wherein the voltage of the intermediate direct current bus is the voltage of a direct current bus on the alternating current-direct current power transmission locomotive.
Optionally, the detection period of the intermediate dc bus voltage may be flexibly set according to an actual situation, which is not limited in the present invention.
For example, fig. 2 is a topological diagram of a full 3-phase main loop of a high-power direct-drive permanent magnet ac transmission electric locomotive 2. The topology shown in fig. 2 includes a pre-charging module 1 and a pre-charging module 2, a four-quadrant rectifying module 1 and a four-quadrant rectifying module 2, a chopping module 1 and a chopping module 2, a ground detection module, an inversion module 1, an inversion module 2, an inversion module 3, and an auxiliary module.
The pre-charging module 1 comprises a pre-charging resistor R1, a pre-charging contactor K11 and a main contactor K1, and the structures of the pre-charging module 2 and the pre-charging module 1 are the same. The four-quadrant rectifier module 1 consists of eight switching tubes g1, g1 ', g2, g 2', g3, g3 ', g4 and g 4', and the four-quadrant rectifier module 2 and the four-quadrant rectifier module 1 are identical in structure. The chopping module 1 comprises a chopping switch tube g5, a chopping current sensor A2, a reverse diode D1 and a chopping resistor R5, and the chopping module 2 and the chopping module 1 are identical in structure. The grounding detection module comprises resistors R3 and R4, the resistance value of R3 is equal to R4, and the resistors R3 and R4 are connected in series at two ends of the direct current loop to form a grounding resistance monitoring loop. The inversion module 1 comprises a three-phase inversion circuit consisting of six switching tubes g6, g7, g8, g9, g10 and g11, and the inversion module 2, the inversion module 3 and the inversion module 1 are identical in structure. K2 is a motor isolation contactor, M is a direct-drive permanent magnet motor, C1 and C3 are direct-current side support capacitors, R2 is a slow-release resistor, and U1 is a direct-current bus voltage sensor. The auxiliary module comprises a three-phase inverter circuit consisting of six switching tubes g12, g13, g14, g15, g16 and g17, and an auxiliary filter cabinet.
In the main loop topology shown in fig. 2, the intermediate dc bus voltage mentioned in this embodiment refers to the voltage measured by U1.
S102, when the detected voltage value of the middle direct-current bus is larger than a chopping upper limit threshold value, a P regulator is adopted to regulate the voltage of the middle direct-current bus; and until the detected voltage value of the intermediate direct-current bus is smaller than a chopping lower limit threshold value, the chopping upper limit threshold value is larger than the chopping lower limit threshold value.
Wherein, the principle of the P regulator is as follows: and controlling the chopper tube to be in an on state within a specific time proportion of the detection period. The specific time scale is related to the detected intermediate dc bus voltage value, and the time scale is larger when the detected intermediate dc bus voltage value is larger.
Because the voltage value of the intermediate direct-current bus is reduced to be smaller than the chopping lower limit threshold value from being larger than the chopping upper limit threshold value in a plurality of detection periods, the chopping tube is not always in the on state, and compared with the prior art, the impact on the voltage of the intermediate direct-current bus is reduced.
It should be noted that, after the P regulator is used to regulate the voltage of the intermediate dc bus, when it is detected that the voltage value of the intermediate dc bus is smaller than the chopping lower threshold, the chopper tube is directly controlled to be turned off.
The chopping control method provided by the embodiment is applied to an AC-DC-AC electric drive locomotive, periodically detects the voltage of an intermediate DC bus, and adjusts the voltage of the intermediate DC bus by adopting a P adjuster when the detected voltage value of the intermediate DC bus is greater than a chopping upper limit threshold value; and reducing the impact on the voltage of the intermediate direct-current bus until the detected voltage value of the intermediate direct-current bus is smaller than the chopping lower limit threshold value.
Fig. 3a is a schematic flow chart of a second embodiment of the chopping control method provided by the present invention. The present embodiment is further described with respect to the implementation manner of S102 in the foregoing embodiment, and as shown in fig. 3a, S102 includes:
s201, determining a chopping duty ratio in a target detection period by using the P regulator.
Wherein the target detection period comprises: and the detection period is from the time that the detected intermediate direct-current bus voltage value is greater than the chopping upper limit threshold value to the time that the detected intermediate direct-current bus voltage value is less than the chopping lower limit threshold value.
For example, assuming that the detection period is 1min, if the intermediate dc bus voltage value detected in the current detection period (1min) is greater than the chopping upper limit threshold, the P regulator starts to regulate the intermediate dc bus voltage, and if the intermediate dc bus voltage value detected in the fifth detection period from the current detection period is smaller than the chopping lower limit threshold after regulation, the current 1min, the second 1min, the third 1min, and the fourth 1min are target detection periods.
Wherein, chopping duty cycle refers to: in a detection period, the on time of the chopper tube accounts for the proportion of the detection period.
Optionally, referring to fig. 3b, an achievable manner of determining the chopping duty cycle in the target detection period is as follows:
firstly, determining target parameters, specifically:
s2011, determining target parameters according to the following formula;
Err-U1-chopper lower threshold
Wherein Err represents a target parameter, and U1 represents a middle dc bus voltage value detected in a target detection period;
secondly, obtaining a control coefficient corresponding to the P regulator, specifically:
s2012, determining the control coefficient according to the following formula;
kp _ chp 1/(direct current bus voltage overvoltage protection threshold-chopping lower limit threshold)
Where Kp _ chp represents a control coefficient.
Finally, according to the control coefficient and the target parameter, determining the chopping duty cycle, specifically:
s2013, determining the chopping duty ratio according to the following formula;
C_duty＝Err*Kp_chp
where C _ duty represents a chopping duty ratio, Err represents a target parameter, and Kp _ chp represents a control coefficient.
The topology shown in fig. 2 is taken as an example for explanation: the upper limit threshold value of chopping is 3100V, the lower limit threshold value of chopping is 2900V, and the overvoltage protection value threshold value of the direct-current bus voltage is 3200V. The voltage measured by U1 in fig. 2 is the intermediate dc bus voltage. Assuming that the intermediate dc bus voltage value U1 detected in the current detection period is 3100V, since U1 is greater than the chopping upper threshold, the intermediate dc bus voltage is adjusted by using a P adjuster, and first, a target parameter Err calculated according to S2011 is: 3100V-2900V-200V; next, the control coefficient Kp _ chp calculated according to S2012 is: 1/(3200V-2900V) is approximately equal to 0.0033; and finally, calculating according to S2013 to obtain a chopping duty ratio as follows: 200V 0.0033 ═ 0.66. The chopping duty cycle is 0.66 during the current detection period.
S202, determining the turn-on time of the chopper tube in the target detection period according to the chopping duty ratio.
And S203, controlling the chopping tube to be switched on or off according to the switching-on time so as to enable the voltage value of the intermediate direct current bus to be reduced to be smaller than the chopping lower limit threshold value.
Because, the chopping duty cycle refers to: in a detection period, the on time of the chopper tube accounts for the proportion of the detection period. Continuing with the example in S201: assuming that the detection period is 1min, on the basis of determining that the chopping duty ratio in the current detection period is 0.66, the on-time of the chopping tube in the current detection period is 1min × 0.66 — 0.66min can be calculated.
Specifically, after the on-time is obtained, the on-time of the chopper tube in the current detection period may be controlled to be 0.66min by controlling the on-off of the chopper tube based on the on-time.
The chopping control method provided in this embodiment describes an achievable way of determining the chopping duty cycle, and specifically includes determining a target parameter Err, determining a control coefficient of the P regulator, and determining the chopping duty cycle according to the target parameter and the control coefficient, so as to provide a basis for controlling the on-time of the chopping tube according to the chopping duty cycle.
Fig. 4 is a schematic flow chart of a third embodiment of the chopping control method provided by the present invention. On the basis of the foregoing embodiment, as shown in fig. 4, the chopping control method provided in this embodiment further includes: and performing error proofing treatment on the chopping duty ratio.
Optionally, the implementation manner of the error-proofing process is as follows:
s301, if the chopping duty ratio is larger than 1, setting the value of the chopping duty ratio to 1; and if the value of the chopping duty cycle is less than 0, setting the value of the chopping duty cycle to 0.
The topology shown in fig. 2 is taken as an example for explanation: the upper limit threshold value of chopping is 3100V, the lower limit threshold value of chopping is 2900V, and the overvoltage protection value threshold value of the direct-current bus voltage is 3200V. The voltage measured by U1 in fig. 2 is the intermediate dc bus voltage. Assume that the intermediate dc bus voltage value detected in the current detection period is 3300V. Then the target parameter Err calculated according to S2011 is: 3300V-2900V ═ 400V; next, the control coefficient Kp _ chp calculated according to S2012 is: 1/(3200V-2900V) is approximately equal to 0.0033; and finally, calculating according to S2013 to obtain a chopping duty ratio as follows: 400V 0.0033 ═ 1.32. If the calculated value of the chopping duty ratio is greater than 1, the value of the chopping duty ratio is set to 1. Similarly, when the calculated value of the chopping duty ratio is smaller than 0, the value of the chopping duty ratio is set to 0.
In the chopping control method provided in this embodiment, a description is given of an implementation manner of performing error-proofing processing on a chopping duty cycle, specifically, if a value of the chopping duty cycle is greater than 1, the value of the chopping duty cycle is set to 1; and if the value of the chopping duty cycle is less than 0, setting the value of the chopping duty cycle to 0. The proportion of the chopping duty cycle may be controlled in the range of 0 to 1.
Fig. 5 is a schematic structural diagram of a first embodiment of a chopping control device provided in the present invention, and as shown in fig. 5, the chopping control device provided in this embodiment includes:
the detection module 501 is configured to periodically detect a middle dc bus voltage, where the middle dc bus voltage is a voltage on a dc bus of the ac-dc-ac power transmission locomotive;
the processing module 502 is configured to, when the detected intermediate dc bus voltage value is greater than the chopping upper limit threshold value, adjust the intermediate dc bus voltage by using a P adjuster; and until the detected voltage value of the intermediate direct-current bus is smaller than a chopping lower limit threshold value, the chopping upper limit threshold value is larger than the chopping lower limit threshold value.
The chopper control device provided in this embodiment may be used to execute the method in the embodiment shown in fig. 1, and the implementation principle and technical effect are similar, which are not described herein again.
Fig. 6 is a schematic structural diagram of a second embodiment of the chopping control device provided in the present invention, and as shown in fig. 6, the processing module 502 of the chopping control device provided in this embodiment includes:
a first determining unit 601, configured to determine, by using the P regulator, a chopping duty cycle in a target detection period; the target detection period includes: the detection period from the time when the detected voltage value of the middle direct-current bus is larger than the chopping upper limit threshold value to the time when the detected voltage value of the middle direct-current bus is smaller than the chopping lower limit threshold value;
a second determining unit 602, configured to determine, according to the chopping duty cycle, an on-time of the chopping tube in a target detection period;
the control unit 603 is configured to control, according to the on-time, on or off of the chopper tube, so that the voltage value of the intermediate dc bus is decreased to be smaller than the chopping lower limit threshold.
Optionally, the chopper control apparatus provided in this embodiment further includes:
and the control module 604 is configured to control the chopper tube to turn off when it is detected that the voltage value of the intermediate dc bus is smaller than the chopping lower limit threshold.
Optionally, the chopper control apparatus provided in this embodiment further includes:
a determining module 605 for determining the target parameter according to the following formula;
Err-U1-chopper lower threshold
Wherein Err represents a target parameter, and U1 represents a middle dc bus voltage value detected in a target detection period;
optionally, the first determining unit 601 is specifically configured to:
acquiring a control coefficient corresponding to the P regulator;
and determining the chopping duty cycle according to the control coefficient and the target parameter.
Optionally, the first determining unit 601 is specifically configured to:
determining the control coefficient according to the following formula;
kp _ chp 1/(direct current bus voltage overvoltage protection threshold-chopping lower limit threshold)
Where Kp _ chp represents a control coefficient.
Optionally, the first determining unit 601 is specifically configured to:
determining the chopping duty cycle according to the following formula;
C_duty＝Err*Kp_chp
where C _ duty represents a chopping duty ratio, Err represents a target parameter, and Kp _ chp represents a control coefficient.
Optionally, the processing module 502 further includes:
and an error-proofing processing module 606, configured to perform error-proofing processing on the chopping duty cycle.
Optionally, the error-proofing processing module 606 is specifically configured to:
if the value of the chopping duty cycle is larger than 1, setting the value of the chopping duty cycle to 1;
and if the value of the chopping duty cycle is less than 0, setting the value of the chopping duty cycle to 0.
The chopper control device provided in this embodiment may be used to execute the methods in the embodiments shown in fig. 2 to fig. 4, and the implementation principle and technical effects are similar, and are not described herein again.
Fig. 7 is a schematic diagram of a hardware structure of the chopper control device provided in the present invention. As shown in fig. 7, the chopper control device of the present embodiment may include:
a memory 701 for storing program instructions.
The processor 702 is configured to implement the method described in any of the above embodiments when the program instructions are executed, and specific implementation principles may refer to the above embodiments, which are not described herein again.
The present invention provides a computer-readable storage medium on which a computer program is stored, the computer program, when executed by a processor, implementing the chopping control method according to any one of the above embodiments.
The present invention also provides a program product including a computer program stored in a readable storage medium, the computer program being readable from the readable storage medium by at least one processor, the computer program being executable by the at least one processor to cause a chopping control device to implement the chopping control method according to any one of the embodiments described above.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A chopping control method is applied to an AC-DC-AC electric transmission locomotive and is characterized by comprising the following steps:
periodically detecting the voltage of an intermediate direct current bus, wherein the voltage of the intermediate direct current bus is the voltage of a direct current bus on the alternating current-direct current power transmission locomotive;
when the detected voltage value of the middle direct-current bus is larger than a chopping upper limit threshold value, a P regulator is adopted to regulate the voltage of the middle direct-current bus until the detected voltage value of the middle direct-current bus is smaller than a chopping lower limit threshold value, and the chopping upper limit threshold value is larger than the chopping lower limit threshold value.
2. The method of claim 1, wherein said regulating said intermediate dc bus voltage with a P regulator comprises:
determining a chopping duty ratio in a target detection period by using the P regulator; the target detection period includes: the detection period from the time when the detected voltage value of the middle direct-current bus is larger than the chopping upper limit threshold value to the time when the detected voltage value of the middle direct-current bus is smaller than the chopping lower limit threshold value;
determining the turn-on time of the chopper tube in a target detection period according to the chopping duty ratio;
and controlling the chopping tube to be switched on or off according to the switching-on time so as to reduce the voltage value of the intermediate direct-current bus to be smaller than the chopping lower limit threshold value.
3. The method of claim 1, further comprising:
and when the voltage value of the intermediate direct-current bus is smaller than the chopping lower limit threshold value, the chopping tube is controlled to be turned off.
4. The method of claim 2, wherein prior to determining the chopping duty cycle within the target detection period using the P-regulator, further comprising:
determining a target parameter according to the following formula;
Err-U1-chopper lower threshold
Wherein Err represents a target parameter, and U1 represents a middle dc bus voltage value detected in a target detection period;
correspondingly, the determining the chopping duty cycle in the target detection period by using the P regulator includes:
acquiring a control coefficient corresponding to the P regulator;
and determining the chopping duty cycle according to the control coefficient and the target parameter.
5. The method of claim 4, wherein the obtaining the control coefficient of the P regulator comprises:
determining the control coefficient according to the following formula;
kp _ chp 1/(direct current bus voltage overvoltage protection threshold-chopping lower limit threshold)
Where Kp _ chp represents a control coefficient.
6. The method of claim 4, wherein determining the chopping duty cycle from the control coefficient and the target parameter comprises:
determining the chopping duty cycle according to the following formula;
C_duty＝Err*Kp_chp
where C _ duty represents a chopping duty ratio, Err represents a target parameter, and Kp _ chp represents a control coefficient.
7. The method of any of claims 1-6, wherein said determining, based on said chopping duty cycle, that the chopping tube is on before the target detection period further comprises:
and performing error proofing treatment on the chopping duty ratio.
8. The method of claim 7, wherein the error-proofing the chopping duty cycle comprises:
if the value of the chopping duty cycle is larger than 1, setting the value of the chopping duty cycle to 1;
and if the value of the chopping duty cycle is less than 0, setting the value of the chopping duty cycle to 0.
9. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the method of any one of claims 1 to 8.
10. A chopper control device, comprising:
a processor; and
a memory for storing executable instructions of the processor;
wherein the processor is configured to implement the method of any of claims 1-8 via execution of the executable instructions.
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| CN201811325367.5A CN111162696A (en) | 2018-11-08 | 2018-11-08 | Chopping control method and device |
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