CN110308325B - Motor train unit overvoltage control method and system - Google Patents
Motor train unit overvoltage control method and system Download PDFInfo
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Abstract
The invention provides an overvoltage control method and system for a motor train unit. The overvoltage control method of the motor train unit comprises the following steps: collecting intermediate direct-current voltage of the motor train unit and network voltage of the motor train unit in a plurality of continuous time periods; carrying out modal analysis on the network voltage in each time period to obtain the harmonic energy amplitude of each time period; carrying out fluctuation detection on the intermediate direct-current voltage, and calculating a voltage fluctuation peak value of each voltage fluctuation period of the intermediate direct-current voltage; judging whether the network voltage generates a higher harmonic resonance trend or not according to the plurality of harmonic energy amplitudes; judging whether the intermediate direct-current voltage generates a low-frequency oscillation trend or not according to the plurality of voltage fluctuation peak values; when the network voltage generates a higher harmonic resonance trend, controlling the motor train unit to operate inertly; and when the intermediate direct-current voltage generates a low-frequency oscillation trend, outputting low-frequency oscillation early warning information. The method can effectively and timely identify the fault, reduce the fault deterioration evolution trend, furthest avoid the influence caused by the fault and ensure the running safety of the motor train unit.
Description
Technical Field
The invention belongs to the technical field of motor train units, and particularly relates to an overvoltage control method and system for a motor train unit.
Background
An alternating current-direct current-alternating current transmission system is widely adopted in the electrified railway in China, and a grid-side converter of the system adopts a pulse width modulation technology and has the characteristics of wide harmonic spectrum and non-negligible higher harmonics. The harmonic current not only affects the performance of a traction transmission system of a high-speed train, but also becomes an excitation source of traction network resonance, so that a train network system generates a harmonic resonance overvoltage phenomenon, the harmonic resonance can cause serious distortion of the voltage and the current of the traction network, the harmonic current of the electric locomotive/motor train unit is further increased, the motor train unit and a traction power supply system form resonance overvoltage, and equipment burning loss is caused.
When a plurality of electric locomotives/motor train units are in a no-load/light-load conditioning state, the electric quantities of the electric locomotives/motor train units and the traction power supply system have an obvious low-frequency oscillation overvoltage phenomenon, the low-frequency oscillation phenomenon is generally induced by nonlinear load current tapping, unstable electric quantities further influence the current tapping of the motor train units through a traction transmission control system, the fluctuation is further intensified, and finally the motor train units are subjected to traction blocking to influence the train order.
At present, aiming at the two fault phenomena, the motor train unit in operation is protected by adopting a threshold judgment method, and although the method can finally realize the isolation under the fault, irreparable influence is caused on the driving order to a certain extent at the cost of power failure of the motor train unit and tripping of a substation.
Disclosure of Invention
The embodiment of the invention mainly aims to provide an overvoltage control method and system for a motor train unit, so that faults can be effectively and timely identified, the fault deterioration evolution trend is reduced, the influence caused by the faults is furthest avoided, and the running safety of the motor train unit is ensured.
In order to achieve the above object, an embodiment of the present invention provides an overvoltage control method for a motor train unit, including:
collecting intermediate direct-current voltage of the motor train unit and network voltage of the motor train unit in a plurality of continuous time periods;
performing modal analysis on the grid voltage in each time period to obtain a plurality of harmonic energies of each time period, and taking the maximum value of the plurality of harmonic energies of each time period as the harmonic energy amplitude of each time period;
carrying out fluctuation detection on the intermediate direct-current voltage, and calculating a voltage fluctuation peak value of each voltage fluctuation period of the intermediate direct-current voltage; the number of harmonic energy amplitudes is multiple, and the number of voltage fluctuation peak values is multiple;
judging whether the network voltage generates a higher harmonic resonance trend or not according to the plurality of harmonic energy amplitudes;
judging whether the intermediate direct-current voltage generates a low-frequency oscillation trend or not according to the plurality of voltage fluctuation peak values;
when the network voltage generates a higher harmonic resonance trend, controlling the motor train unit to operate inertly;
and when the intermediate direct-current voltage generates a low-frequency oscillation trend, outputting low-frequency oscillation early warning information.
The embodiment of the invention also provides an overvoltage control system of a motor train unit, which comprises:
the acquisition unit is used for acquiring the intermediate direct-current voltage of the motor train unit and the network voltage of the motor train unit in a plurality of continuous time periods;
the modal analysis unit is used for carrying out modal analysis on the grid voltage in each time period to obtain a plurality of harmonic energies of each time period, and taking the maximum value of the harmonic energies of each time period as the harmonic energy amplitude of each time period;
the fluctuation peak value unit is used for carrying out fluctuation detection on the intermediate direct-current voltage and calculating the voltage fluctuation peak value of each voltage fluctuation period of the intermediate direct-current voltage; the number of harmonic energy amplitudes is multiple, and the number of voltage fluctuation peak values is multiple;
the first judgment unit is used for judging whether the network voltage generates a higher harmonic resonance trend or not according to the multiple harmonic energy amplitudes;
the second judging unit is used for judging whether the intermediate direct-current voltage generates a low-frequency oscillation trend or not according to the voltage fluctuation peak values;
the first control unit is used for controlling the inertia running of the motor train unit;
and the output unit is used for outputting the low-frequency oscillation early warning information.
The embodiment of the invention also provides computer equipment which comprises a memory, a processor and a computer program which is stored on the memory and can be operated on the processor, wherein the processor realizes the steps of the overvoltage control method of the motor train unit when executing the computer program.
The embodiment of the invention also provides a computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, and the computer program is executed by a processor to realize the steps of the overvoltage control method for the motor train unit.
According to the overvoltage control method and the overvoltage control system for the motor train unit, firstly, the network voltage and the intermediate direct-current voltage are analyzed and calculated to obtain two calculation results, and whether the network voltage generates a higher harmonic resonance trend or not and whether the intermediate direct-current voltage generates a low-frequency oscillation trend or not are judged according to the two calculation results; when the network voltage generates a higher harmonic resonance trend, controlling the motor train unit to operate inertly; when the intermediate direct-current voltage generates a low-frequency oscillation trend, outputting low-frequency oscillation early warning information to effectively and timely identify faults, reduce the fault deterioration evolution trend, furthest avoid the influence caused by the faults and ensure the running safety of the motor train unit.
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 will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a flow chart of an overvoltage control method of a motor train unit according to a first embodiment of the invention;
FIG. 2 is a schematic diagram of collecting grid voltage and intermediate direct current voltage of a motor train unit in the embodiment of the invention;
FIG. 3 is a flow chart of an overvoltage control method for a motor train unit according to a second embodiment of the invention;
FIG. 4 is a schematic illustration of a harmonic energy magnitude curve in an embodiment of the invention;
FIG. 5 is a schematic diagram of a voltage fluctuation peak curve in an embodiment of the present invention;
FIG. 6 is a block diagram of a motor train unit overvoltage control system in the embodiment of the invention.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
As will be appreciated by one skilled in the art, embodiments of the present invention may be embodied as a system, apparatus, device, method, or computer program product. Accordingly, the present disclosure may be embodied in the form of: entirely hardware, entirely software (including firmware, resident software, micro-code, etc.), or a combination of hardware and software.
In view of irreparable influence on the driving order in the prior art, the embodiment of the invention provides an overvoltage control method for a motor train unit, which is used for effectively and timely identifying faults, reducing the fault deterioration evolution trend, avoiding the influence caused by the faults to the maximum extent and ensuring the running safety of the motor train unit. The present invention will be described in detail below with reference to the accompanying drawings.
Fig. 1 is a flowchart of an overvoltage control method of a motor train unit according to a first embodiment of the invention. As shown in fig. 1, the overvoltage control method for the motor train unit includes:
s101: and collecting the intermediate direct-current voltage of the motor train unit and the network voltage of the motor train unit in a plurality of continuous time periods.
FIG. 2 is a schematic diagram for collecting grid voltage and intermediate direct-current voltage of the motor train unit in the embodiment of the invention. As shown in fig. 2, the grid voltage collected on the grid voltage transformer of the motor train unit collects the intermediate dc voltage of the motor train unit between the rectifier and the inverter of the motor train unit, M in fig. 2 is the motor, a, b, c are three-phase power lines, and N is the ground line.
S102: and performing modal analysis on the grid voltage in each time period, obtaining a plurality of harmonic energies of each time period, and taking the maximum value of the plurality of harmonic energies of each time period as the harmonic energy amplitude of each time period.
S103: carrying out fluctuation detection on the intermediate direct-current voltage, and calculating a voltage fluctuation peak value of each voltage fluctuation period of the intermediate direct-current voltage; the number of harmonic energy amplitudes is multiple, and the number of voltage fluctuation peaks is multiple.
S104: and judging whether the network voltage generates a higher harmonic resonance trend or not according to the plurality of harmonic energy amplitudes.
Wherein, S104 includes: fitting a harmonic energy amplitude curve according to the plurality of harmonic energy amplitudes, and judging the increasing trend of the harmonic energy amplitude curve; when the harmonic energy amplitude curve is linearly increased in the early stage and exponentially increased in the later stage, the network voltage generates a higher harmonic resonance trend.
S105: and judging whether the intermediate direct current voltage generates a low-frequency oscillation trend or not according to the plurality of voltage fluctuation peak values.
When the network voltage generates a higher harmonic resonance trend or the intermediate direct-current voltage generates a low-frequency oscillation trend, the network voltage or the intermediate direct-current voltage is in a damping loss state, and the motor train unit has fault signs.
S105 includes: fitting a voltage fluctuation peak value curve according to the voltage fluctuation peak values, and judging the increasing trend of the voltage fluctuation peak value curve; when the voltage fluctuation peak value curve is exponentially increased, the intermediate direct-current voltage generates a low-frequency oscillation trend.
S106: and when the network voltage generates a higher harmonic resonance trend, controlling the motor train unit to operate inertly.
S107: and when the intermediate direct-current voltage generates a low-frequency oscillation trend, outputting low-frequency oscillation early warning information.
The low-frequency oscillation early warning information can be sent to the data monitoring center, and the data monitoring center inhibits the low-frequency oscillation trend by controlling the running number of the motor train units in the area where the motor train units are located.
The main body of the motor train unit overvoltage control method shown in fig. 1 can be a computer. As can be seen from the process shown in fig. 1, the overvoltage control method for the motor train unit according to the embodiment of the invention firstly analyzes and calculates the network voltage and the intermediate direct-current voltage to obtain two calculation results, and respectively judges whether the network voltage generates a higher harmonic resonance trend and whether the intermediate direct-current voltage generates a low frequency oscillation trend according to the two calculation results; when the network voltage generates a higher harmonic resonance trend, controlling the motor train unit to operate inertly; when the intermediate direct-current voltage generates a low-frequency oscillation trend, outputting low-frequency oscillation early warning information to effectively and timely identify faults, reduce the fault deterioration evolution trend, furthest avoid the influence caused by the faults and ensure the running safety of the motor train unit.
After executing S107, the method may further include: the method comprises the steps of obtaining time and motor train unit position kilometers when a motor train unit has faults, such as a higher harmonic resonance trend generated by network voltage or a low frequency oscillation trend generated by intermediate direct current voltage, generating a fault report according to original fault data, fault types (higher harmonic resonance and low frequency oscillation), time corresponding to the fault and motor train unit position coordinates, and sending the fault report to an external train control and management system.
FIG. 3 is a flow chart of an overvoltage control method of a motor train unit according to a second embodiment of the invention. As shown in fig. 3, the overvoltage control method for the motor train unit further includes:
s201: and calculating a plurality of first deviation degrees according to the plurality of harmonic energy amplitudes and a preset first reference difference.
S202: and calculating a plurality of second deviation degrees according to the plurality of voltage fluctuation peak values and a preset second reference difference.
S203: and executing S104 when the plurality of first deviation degrees are smaller than a preset first threshold value and the plurality of second deviation degrees are smaller than a preset second threshold value, otherwise, controlling the motor train unit to operate in a main section breaking mode or in a pantograph lowering mode.
One of the specific embodiments of the present invention is as follows:
1. and collecting the intermediate direct-current voltage of the motor train unit and the network voltage of the motor train unit in a plurality of continuous time periods.
2. And performing modal analysis on the grid voltage in each time period, obtaining a plurality of harmonic energies of each time period, and taking the maximum value of the plurality of harmonic energies of each time period as the harmonic energy amplitude of each time period. Carrying out fluctuation detection on the intermediate direct-current voltage, and calculating a voltage fluctuation peak value of each voltage fluctuation period of the intermediate direct-current voltage; the number of harmonic energy amplitudes is multiple, and the number of voltage fluctuation peaks is multiple.
3. And calculating a plurality of first deviation degrees according to the plurality of harmonic energy amplitudes and a preset first reference difference. And calculating a plurality of second deviation degrees according to the plurality of voltage fluctuation peak values and a preset second reference difference.
4. And (5) when the plurality of first deviation degrees are smaller than the preset first threshold value and the plurality of second deviation degrees are smaller than the preset second threshold value, otherwise, the motor train unit has transient faults, the motor train unit is controlled to operate in a main section breaking mode or a pantograph lowering mode, and relevant reset operation is carried out.
5. Fitting a harmonic energy amplitude curve according to the plurality of harmonic energy amplitudes, and judging the increasing trend of the harmonic energy amplitude curve; when the harmonic energy amplitude curve is linearly increased in the early stage and exponentially increased in the later stage, the network voltage generates a trend of higher harmonic resonance (the resonance frequency is not less than 850Hz), and the participation factor of the harmonic resonance is withdrawn, so that the inert running of the motor train unit is controlled, and the fault symptom of the motor train unit can be inhibited.
FIG. 4 is a schematic diagram of a harmonic energy magnitude curve in an embodiment of the invention. The abscissa in fig. 4 is time in units of seconds(s); the ordinate is the amplitude of the energy in volts (V).
FIG. 4 shows that a plurality of harmonic energy amplitudes are provided, specifically, the 85 th harmonic energy amplitude of the network voltage in 6min after 10:00:00 of the motor train unit is obtained through curve fitting, and an 85 th harmonic energy amplitude curve of the network voltage is obtained through curve fitting. As shown in fig. 4, the harmonic energy amplitudes from 0s to 195s increase linearly, the harmonic energy amplitudes from 195s to 379s increase exponentially, and the fitted function expression is as follows:
in the formula, tnorIs a normalized value for the time t,
is the returned mean value of time t, tstdAs the returned standard deviation at time t, k, b are linear function fitting parameters, a1、a2、p1、p2Fitting parameters for exponential functions, and U is the harmonic energy amplitude.
When the motor train unit operates to 10:06:19, the 85 th harmonic energy amplitude of the grid voltage is increased to 2484.5V, the motor train unit fails to rectify, and the operation is stopped.
Obviously, before the motor train unit runs to 10:06:04, the motor train unit is not triggered to trip off the main circuit breaker, and the 85 th harmonic energy amplitude of the network voltage shows the trends of exponential increase and damping loss. The method and the device can recognize that the change trend of the higher harmonics is exponentially increased, so that the inertia running of the motor train unit is controlled, and the further excitation of the higher harmonic resonance is avoided.
6. Fitting a voltage fluctuation peak value curve according to the voltage fluctuation peak values, and judging the increasing trend of the voltage fluctuation peak value curve; when the voltage fluctuation peak curve is exponentially increased, the intermediate direct-current voltage generates a low-frequency oscillation (oscillation frequency is not more than 10Hz) trend, at the moment, low-frequency oscillation early warning information is output to the data monitoring center, and the data monitoring center inhibits the low-frequency oscillation trend by controlling the running number of the motor train units in the area where the motor train units are located.
Fig. 5 is a schematic diagram of a voltage fluctuation peak curve in an embodiment of the present invention. The abscissa in fig. 5 is time in units of seconds(s); the ordinate is the peak of the voltage fluctuation in volts (V).
As shown in fig. 5, the voltage fluctuation peak of the motor train unit has a periodic fluctuation of 0.56s in 14s after 13:22:58, the voltage fluctuation peak shows an exponential increase, and the fitted function expression is as follows:
in the formula, c1、c2、q1、q2Fitting parameters for an exponential function, and U' is a voltage fluctuation peak value.
When the motor train unit runs to 13:23:12, the voltage fluctuation peak value of the intermediate direct-current voltage is increased to 2090V, and the rectification failure of the motor train unit is caused.
Obviously, before the motor train unit runs to 13:23:11, traction blocking of the motor train unit is not triggered, the voltage fluctuation peak value of the intermediate direct-current voltage shows the trends of exponential increase and damping loss, the application can recognize that the voltage fluctuation peak value change trend of the intermediate direct-current voltage is exponential increase, and low-frequency oscillation early warning information is output, so that further deterioration of faults is avoided.
7. The method comprises the steps of obtaining time and motor train unit position kilometers when a motor train unit has faults, such as a higher harmonic resonance trend generated by network voltage or a low frequency oscillation trend generated by intermediate direct current voltage, generating a fault report according to original fault data, fault types (higher harmonic resonance and low frequency oscillation), time corresponding to the fault and motor train unit position coordinates, and sending the fault report to an external train control and management system.
To sum up, the overvoltage control method for the motor train unit according to the embodiment of the invention firstly analyzes and calculates the network voltage and the intermediate direct-current voltage to obtain two calculation results, and judges whether the network voltage generates a higher harmonic resonance trend and whether the intermediate direct-current voltage generates a low-frequency oscillation trend according to the two calculation results; when the network voltage generates a higher harmonic resonance trend, controlling the motor train unit to operate inertly; when the intermediate direct-current voltage generates a low-frequency oscillation trend, outputting low-frequency oscillation early warning information to effectively and timely identify faults, reduce the fault deterioration evolution trend, furthest avoid the influence caused by the faults and ensure the running safety of the motor train unit.
Based on the same invention concept, the embodiment of the invention also provides a motor train unit overvoltage control system, and as the problem solving principle of the system is similar to the motor train unit overvoltage control method, the implementation of the system can refer to the implementation of the method, and repeated parts are not repeated.
FIG. 6 is a block diagram of a motor train unit overvoltage control system in the embodiment of the invention. As shown in fig. 6, the overvoltage control system for a motor train unit includes:
the acquisition unit is used for acquiring the intermediate direct-current voltage of the motor train unit and the network voltage of the motor train unit in a plurality of continuous time periods;
the modal analysis unit is used for carrying out modal analysis on the grid voltage in each time period to obtain a plurality of harmonic energies of each time period, and taking the maximum value of the harmonic energies of each time period as the harmonic energy amplitude of each time period;
the fluctuation peak value unit is used for carrying out fluctuation detection on the intermediate direct-current voltage and calculating the voltage fluctuation peak value of each voltage fluctuation period of the intermediate direct-current voltage; the number of harmonic energy amplitudes is multiple, and the number of voltage fluctuation peak values is multiple;
the first judgment unit is used for judging whether the network voltage generates a higher harmonic resonance trend or not according to the multiple harmonic energy amplitudes;
the second judging unit is used for judging whether the intermediate direct-current voltage generates a low-frequency oscillation trend or not according to the voltage fluctuation peak values;
the first control unit is used for controlling the inertia running of the motor train unit;
and the output unit is used for outputting the low-frequency oscillation early warning information.
In one embodiment, the method further comprises the following steps:
the first calculation unit is used for calculating a plurality of first deviation degrees according to the plurality of harmonic energy amplitudes and a preset first reference difference;
the second calculation unit is used for calculating a plurality of second deviation degrees according to the voltage fluctuation peak values and a preset second reference difference;
and the second control unit is used for controlling the main section breaking operation or the bow lowering operation of the motor train unit.
In one embodiment, the first determining unit is specifically configured to:
fitting a harmonic energy amplitude curve according to the plurality of harmonic energy amplitudes;
judging the increasing trend of the harmonic energy amplitude curve;
when the harmonic energy amplitude curve is linearly increased in the early stage and exponentially increased in the later stage, the network voltage generates a higher harmonic resonance trend.
In one embodiment, the second determining unit is specifically configured to:
fitting a voltage fluctuation peak value curve according to the voltage fluctuation peak values;
judging the increasing trend of the voltage fluctuation peak value curve;
when the voltage fluctuation peak value curve is exponentially increased, the intermediate direct-current voltage generates a low-frequency oscillation trend.
To sum up, the overvoltage control system of the motor train unit according to the embodiment of the invention firstly analyzes and calculates the network voltage and the intermediate direct-current voltage to obtain two calculation results, and judges whether the network voltage generates a higher harmonic resonance trend and whether the intermediate direct-current voltage generates a low-frequency oscillation trend according to the two calculation results; when the network voltage generates a higher harmonic resonance trend, controlling the motor train unit to operate inertly; when the intermediate direct-current voltage generates a low-frequency oscillation trend, outputting low-frequency oscillation early warning information to effectively and timely identify faults, reduce the fault deterioration evolution trend, furthest avoid the influence caused by the faults and ensure the running safety of the motor train unit.
The embodiment of the invention also provides computer equipment, which comprises a memory, a processor and a computer program which is stored on the memory and can be run on the processor, wherein the processor can realize all or part of the content of the overvoltage control method of the motor train unit when executing the computer program, for example, the processor can realize the following content when executing the computer program:
collecting intermediate direct-current voltage of the motor train unit and network voltage of the motor train unit in a plurality of continuous time periods;
performing modal analysis on the grid voltage in each time period to obtain a plurality of harmonic energies of each time period, and taking the maximum value of the plurality of harmonic energies of each time period as the harmonic energy amplitude of each time period;
carrying out fluctuation detection on the intermediate direct-current voltage, and calculating a voltage fluctuation peak value of each voltage fluctuation period of the intermediate direct-current voltage; the number of harmonic energy amplitudes is multiple, and the number of voltage fluctuation peak values is multiple;
judging whether the network voltage generates a higher harmonic resonance trend or not according to the plurality of harmonic energy amplitudes;
judging whether the intermediate direct-current voltage generates a low-frequency oscillation trend or not according to the plurality of voltage fluctuation peak values;
when the network voltage generates a higher harmonic resonance trend, controlling the motor train unit to operate inertly;
and when the intermediate direct-current voltage generates a low-frequency oscillation trend, outputting low-frequency oscillation early warning information.
To sum up, the computer device of the embodiment of the present invention first analyzes and calculates the network voltage and the intermediate dc voltage to obtain two calculation results, and determines whether the network voltage generates a higher harmonic resonance trend and whether the intermediate dc voltage generates a low frequency oscillation trend according to the two calculation results; when the network voltage generates a higher harmonic resonance trend, controlling the motor train unit to operate inertly; when the intermediate direct-current voltage generates a low-frequency oscillation trend, outputting low-frequency oscillation early warning information to effectively and timely identify faults, reduce the fault deterioration evolution trend, furthest avoid the influence caused by the faults and ensure the running safety of the motor train unit.
The embodiment of the invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, may implement all or part of the content of the overvoltage control method for a motor train unit, for example, when the processor executes the computer program, the following content may be implemented:
collecting intermediate direct-current voltage of the motor train unit and network voltage of the motor train unit in a plurality of continuous time periods;
performing modal analysis on the grid voltage in each time period to obtain a plurality of harmonic energies of each time period, and taking the maximum value of the plurality of harmonic energies of each time period as the harmonic energy amplitude of each time period;
carrying out fluctuation detection on the intermediate direct-current voltage, and calculating a voltage fluctuation peak value of each voltage fluctuation period of the intermediate direct-current voltage; the number of harmonic energy amplitudes is multiple, and the number of voltage fluctuation peak values is multiple;
judging whether the network voltage generates a higher harmonic resonance trend or not according to the plurality of harmonic energy amplitudes;
judging whether the intermediate direct-current voltage generates a low-frequency oscillation trend or not according to the plurality of voltage fluctuation peak values;
when the network voltage generates a higher harmonic resonance trend, controlling the motor train unit to operate inertly;
and when the intermediate direct-current voltage generates a low-frequency oscillation trend, outputting low-frequency oscillation early warning information.
To sum up, the computer-readable storage medium according to the embodiment of the present invention first analyzes and calculates the network voltage and the intermediate dc voltage to obtain two calculation results, and determines whether the network voltage generates a higher harmonic resonance trend and whether the intermediate dc voltage generates a low frequency oscillation trend according to the two calculation results; when the network voltage generates a higher harmonic resonance trend, controlling the motor train unit to operate inertly; when the intermediate direct-current voltage generates a low-frequency oscillation trend, outputting low-frequency oscillation early warning information to effectively and timely identify faults, reduce the fault deterioration evolution trend, furthest avoid the influence caused by the faults and ensure the running safety of the motor train unit.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The principle and the implementation mode of the invention are explained by applying specific embodiments in the invention, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (6)
1. The overvoltage control method of the motor train unit is characterized by comprising the following steps:
collecting intermediate direct-current voltage of the motor train unit and network voltage of the motor train unit in a plurality of continuous time periods;
performing modal analysis on the grid voltage in each time period to obtain a plurality of harmonic energies of each time period, and taking the maximum value of the plurality of harmonic energies of each time period as the harmonic energy amplitude of each time period;
carrying out fluctuation detection on the intermediate direct-current voltage, and calculating a voltage fluctuation peak value of each voltage fluctuation period of the intermediate direct-current voltage; the number of the harmonic energy amplitudes is multiple, and the number of the voltage fluctuation peak values is multiple;
judging whether the network voltage generates a higher harmonic resonance trend or not according to a plurality of harmonic energy amplitudes;
judging whether the intermediate direct-current voltage generates a low-frequency oscillation trend or not according to a plurality of voltage fluctuation peak values;
when the network voltage generates a higher harmonic resonance trend, controlling the motor train unit to operate inertly;
when the intermediate direct-current voltage generates a low-frequency oscillation trend, outputting low-frequency oscillation early warning information;
judging whether the network voltage generates a higher harmonic resonance trend according to a plurality of harmonic energy amplitudes, and the method comprises the following steps:
fitting a harmonic energy amplitude curve according to the plurality of harmonic energy amplitudes;
judging the increasing trend of the harmonic energy amplitude curve;
when the harmonic energy amplitude curve is linearly increased in the early stage and exponentially increased in the later stage, the network voltage generates a higher harmonic resonance trend;
judging whether the intermediate direct-current voltage generates a low-frequency oscillation trend or not according to a plurality of voltage fluctuation peak values, wherein the method comprises the following steps of:
fitting a voltage fluctuation peak value curve according to the voltage fluctuation peak values;
judging the increasing trend of the voltage fluctuation peak value curve;
when the voltage fluctuation peak value curve is exponentially increased, the intermediate direct-current voltage generates a low-frequency oscillation trend.
2. The overvoltage control method for the motor train unit according to claim 1, further comprising:
calculating a plurality of first deviation degrees according to the plurality of harmonic energy amplitudes and a preset first reference difference;
calculating a plurality of second deviation degrees according to the voltage fluctuation peak values and a preset second reference difference;
and when the first deviation degrees are all smaller than a preset first threshold value and the second deviation degrees are all smaller than a preset second threshold value, judging whether the network voltage generates a higher harmonic resonance trend or not according to the harmonic energy amplitude values, and otherwise, controlling the motor train unit to operate in a main section breaking mode or in a bow-reducing mode.
3. The utility model provides a EMUs overvoltage control system which characterized in that includes:
the acquisition unit is used for acquiring the intermediate direct-current voltage of the motor train unit and the network voltage of the motor train unit in a plurality of continuous time periods;
the modal analysis unit is used for carrying out modal analysis on the grid voltage in each time period to obtain a plurality of harmonic energies of each time period, and taking the maximum value of the harmonic energies of each time period as the harmonic energy amplitude of each time period;
the fluctuation peak value unit is used for carrying out fluctuation detection on the intermediate direct-current voltage and calculating the voltage fluctuation peak value of each voltage fluctuation period of the intermediate direct-current voltage; the number of the harmonic energy amplitudes is multiple, and the number of the voltage fluctuation peak values is multiple;
the first judgment unit is used for judging whether the network voltage generates a higher harmonic resonance trend or not according to a plurality of harmonic energy amplitudes;
the second judging unit is used for judging whether the intermediate direct-current voltage generates a low-frequency oscillation trend or not according to a plurality of voltage fluctuation peak values;
the first control unit is used for controlling the motor train unit to perform inert running;
the output unit is used for outputting low-frequency oscillation early warning information;
the first judging unit is specifically configured to:
fitting a harmonic energy amplitude curve according to the plurality of harmonic energy amplitudes;
judging the increasing trend of the harmonic energy amplitude curve;
when the harmonic energy amplitude curve is linearly increased in the early stage and exponentially increased in the later stage, the network voltage generates a higher harmonic resonance trend;
the second judging unit is specifically configured to:
fitting a voltage fluctuation peak value curve according to the voltage fluctuation peak values;
judging the increasing trend of the voltage fluctuation peak value curve;
when the voltage fluctuation peak value curve is exponentially increased, the intermediate direct-current voltage generates a low-frequency oscillation trend.
4. The overvoltage control system for a motor train unit according to claim 3, further comprising:
the first calculation unit is used for calculating a plurality of first deviation degrees according to the plurality of harmonic energy amplitudes and a preset first reference difference;
the second calculation unit is used for calculating a plurality of second deviation degrees according to the voltage fluctuation peak values and a preset second reference difference;
and the second control unit is used for controlling the motor train unit to operate in a main section breaking mode or in a pantograph lowering mode.
5. A computer arrangement comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor when executing the computer program realizes the steps of the overvoltage control method for a motor train unit according to any one of claims 1 to 2.
6. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the overvoltage control method for a motor train unit according to any one of claims 1 to 2.
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| JPH06319228A (en) * | 1993-05-06 | 1994-11-15 | Fuji Electric Co Ltd | Control circuit for static type reactive compensation equipment |
| CN105223810A (en) * | 2015-09-06 | 2016-01-06 | 西南交通大学 | A kind of high ferro low-frequency oscillation overvoltage damping method based on multivariable Control |
| CN107154634A (en) * | 2017-05-02 | 2017-09-12 | 西南交通大学 | A kind of high ferro low-frequency oscillation suppression method based on model prediction current control |
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