CN113852130B - Power supply and energy supply circuit, method, system, device and storage medium for rail transit - Google Patents
Power supply and energy supply circuit, method, system, device and storage medium for rail transit Download PDFInfo
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- CN113852130B CN113852130B CN202111427582.8A CN202111427582A CN113852130B CN 113852130 B CN113852130 B CN 113852130B CN 202111427582 A CN202111427582 A CN 202111427582A CN 113852130 B CN113852130 B CN 113852130B
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L9/00—Electric propulsion with power supply external to the vehicle
- B60L9/005—Interference suppression
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
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- B60L2200/26—Rail vehicles
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The application discloses a rail transit power supply and energy feed circuit, a method, a system, a device and a computer readable storage medium, comprising: the system comprises a double-tap transformer (1), a grid-connected impedance controller (2) and a power module (3) which are connected in sequence; the grid-connected impedance controller (2) comprises a first grid-connected three-phase reactor L1, a second grid-connected three-phase reactor L2, a first controllable switch SSR1 and a second controllable switch SSR 2; the first controllable switch SSR1 is connected in parallel with the first grid-connected three-phase reactor L1, and the second controllable switch SSR2 is connected in parallel with the second grid-connected three-phase reactor L2. The controllable grid-connected impedance controller (2) is arranged, so that whether impedance is incorporated into the circuit or not can be switched, meanwhile, the double-tap transformer (1) is adopted, available input voltage is provided for different modes, the power module (3) is cooperated with the double-tap transformer (1) and the grid-connected impedance controller (2) to transform in the circuit, control signals are changed together to change the working mode, and therefore the circuit compatibility is better and the running mode is various.
Description
Technical Field
The invention relates to the field of rail transit, in particular to a power supply and energy supply circuit, a method, a system, a device and a computer readable storage medium for rail transit.
Background
Along with the technical progress, energy conservation and emission reduction are gradually popularized, the braking energy feedback technology gradually becomes a new standard in the field of transportation, and a large amount of electric energy can be generated to feed back to a power grid when a train is braked in railway transportation.
In the prior art, when regenerative braking energy of a direct current traction network is fed back to an alternating current power grid, a synchronous phase angle of a fundamental voltage component of the alternating current power grid voltage is acquired; according to the synchronous phase angle, respectively extracting at least one harmonic current with the same number as at least one appointed harmonic frequency from the alternating current output by the primary side of the energy-fed transformer; tracking the at least one harmonic current to generate a corresponding at least one harmonic current for tracking to generate a corresponding at least one compensated reference voltage, respectively; and compensating the harmonic waves of the appointed times in the alternating current output by the primary side of the energy-fed transformer based on the at least one compensation reference voltage. According to the control method, passive filtering currents such as a capacitor compensation device and the like do not need to be arranged independently, so that the reliability and the safety of a power supply system are improved.
However, the above-mentioned techniques only achieve unidirectional flow of energy feedback, and cannot achieve efficient traction power supply. The loss is high, the switching loss of the IGBT comes from the current change rate and the voltage change rate, the working voltage of the rail transit power supply is high, and the loss of full-power IGBT equipment is high due to frequent sudden change of the load. The operation mode is few, can't supply power with current diode and run in parallel, is difficult to be applicable to the transformation project. The power supply capacity, the secondary voltage grade, the diode rectification droop characteristic and the safety protection mode of the rail transit power supply equipment are already specified in the design planning process, the newly added equipment needs to be completely matched with a design scheme, and the structural design and the electrical performance have limitations.
Therefore, a rail transit power supply and energy supply circuit with better compatibility and various operation modes is needed.
Disclosure of Invention
In view of the above, the present invention provides a power supply and energy supply circuit, method, system, device and computer readable storage medium for rail transit, which have better compatibility and various operation modes. The specific scheme is as follows:
a rail transit power and energy feed circuit comprising: the system comprises a double-tap transformer 1, a grid-connected impedance controller 2 and a power module 3 which are connected in sequence;
the grid-connected impedance controller 2 comprises a first grid-connected three-phase reactor L1, a second grid-connected three-phase reactor L2, a first controllable switch SSR1 and a second controllable switch SSR 2;
the first controllable switch SSR1 is connected in parallel with the first grid-connected three-phase reactor L1, and the second controllable switch SSR2 is connected in parallel with the second grid-connected three-phase reactor L2;
the double-tap transformer 1 comprises two switchable groups of taps which respectively provide different voltage levels.
Optionally, both the first controllable switch SSR1 and the second controllable switch SSR2 are thyristors.
Optionally, one group of taps of the double-tap transformer 1 provides 950VAC voltage, and the other group of taps provides 1180VAC voltage.
The invention also discloses a rail transit power supply and energy feed method, which is applied to the rail transit power supply and energy feed device and comprises the following steps:
when the train works in a train traction working state in a first mode, controlling the double-tap transformer 1 to be connected with a tap corresponding to the first mode;
controlling a first controllable switch SSR1 and a second controllable switch SSR2 in the grid-connected impedance controller 2 to be conducted;
controlling a controllable switch in the power module 3 to be turned off, and utilizing a diode in the power module to work in a diode rectification state;
when the train working in the first mode enters a braking working state from a traction state, controlling the first controllable switch SSR1 and the second controllable switch SSR2 in the grid-connected impedance controller 2 to be turned off;
and controlling a controllable switch in the power module 3 to enter a PWM inversion working state.
Optionally, the method further includes:
when the train works in a train traction working state in a second mode, controlling the double-tap transformer 1 to be connected with a tap corresponding to the second mode in a grid mode;
controlling the first controllable switch SSR1 and the second controllable switch SSR2 in the grid-connected impedance controller 2 to be turned off;
controlling a controllable switch in the power module 3 to enter a PWM rectification working state;
when the train working in the second mode enters a braking working state from a traction state, controlling the first controllable switch SSR1 and the second controllable switch SSR2 in the grid-connected impedance controller 2 to be turned off;
and controlling a controllable switch in the power module 3 to enter a PWM inversion working state.
Optionally, the method further includes:
acquiring a current time period;
setting energy feedback starting voltage corresponding to the current time period by utilizing pre-established time domain matching information;
and the time domain matching information is a corresponding relation between the time domain matching information and the feedable starting voltage which is established in advance according to the line daily power curve.
The invention also discloses a rail transit power supply and energy feed system, which comprises:
the system comprises a first tap control module, a second tap control module and a control module, wherein the first tap control module is used for controlling a double-tap transformer 1 to be connected with a tap corresponding to a first mode when the train works in a train traction working state of the first mode;
the first switch control module is used for controlling the conduction of a first controllable switch SSR1 and a second controllable switch SSR2 in the grid-connected impedance controller 2;
the first power control module is used for controlling the controllable switch in the power module 3 to be switched off, and the diode in the first power control module is utilized to work in a diode rectification state;
the second switch control module is used for controlling the first controllable switch SSR1 and the second controllable switch SSR2 in the grid-connected impedance controller 2 to be turned off when the train working in the first mode enters a braking working state from a traction state;
and the second power control module is used for controlling the controllable switch in the power module 3 to enter a PWM inversion working state.
Optionally, the method further includes:
the second tap control module is used for controlling the double-tap transformer 1 to be connected with a tap corresponding to a second mode when the train works in a train traction working state of the second mode;
the second switch control module is used for controlling the first controllable switch SSR1 and the second controllable switch SSR2 in the grid-connected impedance controller 2 to be turned off;
the third power control module is used for controlling a controllable switch in the power module 3 to enter a PWM rectification working state;
the third tap control module is used for controlling the first controllable switch SSR1 and the second controllable switch SSR2 in the grid-connected impedance controller 2 to be turned off when the train working in the second mode enters a braking working state from a traction state;
and the fourth power control module is used for controlling the controllable switch in the power module 3 to enter a PWM inversion working state.
The invention also discloses a rail transit power supply and energy feed device, which comprises:
a memory for storing a computer program;
a processor for executing the computer program to implement the rail transit power supply and energy feeding method as described above.
The invention also discloses a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements a rail transit power supply and energy feed method as described above.
In the invention, the rail transit power supply and energy feed circuit comprises: the system comprises a double-tap transformer 1, a grid-connected impedance controller 2 and a power module 3 which are connected in sequence; the grid-connected impedance controller 2 comprises a first grid-connected three-phase reactor L1, a second grid-connected three-phase reactor L2, a first controllable switch SSR1 and a second controllable switch SSR 2; the first controllable switch SSR1 is connected in parallel with the first grid-connected three-phase reactor L1, and the second controllable switch SSR2 is connected in parallel with the second grid-connected three-phase reactor L2; a two-tap transformer 1 comprises two switchable sets of taps each providing a different voltage level.
The controllable grid-connected impedance controller 2 is arranged, so that whether impedance is incorporated into a circuit can be switched, circuit premise is provided for subsequent mode switching, meanwhile, the double-tap transformer 1 is adopted to provide available input voltage for different modes, normal operation of the circuit after mode switching is guaranteed, the power module 3 cooperates with the double-tap transformer 1 and the grid-connected impedance controller 2 to transform in the circuit, control signals are changed together to change the working mode, and therefore the circuit can work in working modes such as diode rectification, PWM rectification and PWM inversion, and the circuit is better in compatibility and various in operation mode.
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 embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a topological diagram of a rail transit power supply and energy feed circuit disclosed by an embodiment of the invention;
FIG. 2 is a schematic flow chart of a rail transit power supply and energy feed method disclosed by an embodiment of the invention;
FIG. 3 is a schematic flow chart of another rail transit power supply and energy feed method disclosed in the embodiment of the invention;
fig. 4 is a schematic structural diagram of a rail transit power supply and energy feed system disclosed 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.
The embodiment of the invention discloses a rail transit power supply and energy feed circuit, which is shown in figure 1 and comprises the following components: the system comprises a double-tap transformer 1, a grid-connected impedance controller 2 and a power module 3 which are connected in sequence;
the grid-connected impedance controller 2 comprises a first grid-connected three-phase reactor L1, a second grid-connected three-phase reactor L2, a first controllable switch SSR1 and a second controllable switch SSR 2;
the first controllable switch SSR1 is connected in parallel with the first grid-connected three-phase reactor L1, and the second controllable switch SSR2 is connected in parallel with the second grid-connected three-phase reactor L2;
a two-tap transformer 1 comprises two switchable sets of taps each providing a different voltage level.
Specifically, in order to realize the diversification of the operation mode, a grid-connected impedance controller 2 is arranged between an energy feedback transformer and a power module 3, whether impedance is incorporated into a circuit or not can be controlled through the grid-connected impedance controller 2, thereby providing a premise for switching between a diode rectification traction mode and a PWM rectification traction mode, and meanwhile, a double-tap transformer 1 is correspondingly adopted, two groups of taps are provided, each group of taps provides different voltage levels and respectively corresponds to the diode rectification traction mode and the PWM rectification traction mode, different input voltages are provided for different modes, the input voltage is ensured to be within a reasonable range after mode switching, and the circuit is ensured to work normally.
Specifically, as shown in fig. 1, a first grid-connected three-phase reactor L1 and a second grid-connected three-phase reactor L2 in the grid-connected impedance controller 2 are respectively connected in series to a loop between the double-tap transformer 1 and the power module 3, and a first controllable switch SSR1 and a second controllable switch SSR2 are respectively connected in parallel to two ends of the first grid-connected three-phase reactor L1 and the second grid-connected three-phase reactor L2. The first grid-connected three-phase reactor L1 and the second grid-connected three-phase reactor L2 can be short-circuited by controlling the switches of the first controllable switch SSR1 and the second controllable switch SSR 2. When the power module 3 needs to be in the diode rectification mode, the first controllable switch SSR1 and the second controllable switch SSR2 can be controlled to be turned on, and when the first grid-connected three-phase reactor L1 and the second grid-connected three-phase reactor L2 are short-circuited, no reactance exists in a loop, so that the circuit works in the diode rectification traction mode. When the power module 3 needs to be in the PWM rectification traction mode, the first controllable switch SSR1 and the second controllable switch SSR2 may be controlled to be turned off, so that the first grid-connected three-phase reactor L1 and the second grid-connected three-phase reactor L2 operate in a loop, thereby operating the power module 3 in the PWM rectification mode. When the power module 3 needs to be in the PWM inversion energy feedback mode, the first controllable switch SSR1 and the second controllable switch SSR2 may be controlled to be turned off, so that the first grid-connected three-phase reactor L1 and the second grid-connected three-phase reactor L2 operate in a loop, and thus the power module 3 operates in the PWM inversion mode.
It can be understood that when the power module 3 operates in different modes, the control signal of the power module 3 is correspondingly changed, so as to ensure that the power module 3 can be changed simultaneously with the circuit, and ensure that the mode switching is successful.
Therefore, the controllable grid-connected impedance controller 2 is arranged in the embodiment of the invention, so that whether impedance is merged into the circuit can be switched, a circuit premise is provided for subsequent mode switching, meanwhile, the double-tap transformer 1 is adopted to provide available input voltage for different modes, normal operation of the circuit after mode switching is ensured, the power module 3 cooperates with the transformation of the double-tap transformer 1 and the grid-connected impedance controller 2 in the circuit to change a control signal together to change a working mode, and the circuit can work in working modes such as diode rectification, PWM rectification and PWM inversion, so that the circuit has better compatibility and various operation modes.
In particular, the first controllable switch SSR1 and the second controllable switch SSR2 may both be thyristors.
Specifically, one group of taps of the double-tap transformer 1 provides 950VAC voltage, the other group of taps provides 1180VAC voltage, the double-tap transformer 1 can provide 1180VAC voltage when the train adopts the diode rectification traction mode, and the double-tap transformer 1 can provide 950VAC voltage when the train adopts the PWM rectification traction mode. In addition, the high-voltage side of the double-tap transformer 1 can be connected with an input lead wire of 35 KV.
It can be understood that when the power module 3 operates in the diode rectification mode, the freewheeling diode of the IGBT in the power module 3 may be used to form a three-phase uncontrolled rectification circuit, so that the system operates in the diode rectification mode.
Correspondingly, the embodiment of the invention also discloses a rail transit power supply and energy feed method, which is shown in fig. 1 and fig. 2 and is applied to the rail transit power supply and energy feed device, and the method comprises the following steps:
s11: and when the train works in the train traction working state of the first mode, controlling the double-tap transformer 1 to be connected with the tap corresponding to the first mode in a grid mode.
Specifically, the double-tap transformer 1 comprises two switchable taps which respectively provide different voltage levels, and the different working modes have corresponding working voltages, so that the double-tap transformer 1 also needs to be controlled to adjust the corresponding tap grid connection to provide the corresponding voltages when the modes are switched, the first mode can be a diode rectification traction mode and a PWM inversion energy feedback mode, and when a train works in the diode rectification traction mode, the double-tap transformer 1 can be controlled to provide 1180VAC tap grid connection.
S12: the first controllable switch SSR1 and the second controllable switch SSR2 in the grid-tied impedance controller 2 are controlled to be conductive.
Specifically, after the taps corresponding to the double-tap transformer 1 are controlled to be connected to the grid, the first controllable switch SSR1 and the second controllable switch SSR2 in the grid-connected impedance controller 2 need to be controlled to be conducted and short-circuited with the first grid-connected three-phase reactor L1 and the second grid-connected three-phase reactor L2, so that the phase shift of the alternating-current power grid is avoided, and a cushion is laid for the subsequent power module 3 to work in a diode rectification mode. The alternate phase design of the rectifier transformer and the 24-pulse rectifier power supply of the original diode power supply system can also reduce the harmonic content of the power supply network.
S13: the controllable switches in the power modules 3 are controlled to be turned off and to operate in a diode-rectified state with the diodes therein.
Specifically, the controllable switch in the power module 3 is turned off by a control signal controlling the power module 3, and the diode therein is operated in the diode rectification state, for example, the IGBT in the power module 3 is controlled to be turned off, and the freewheeling diode of the IGBT is operated in the diode rectification state.
S14: when the train working in the first mode enters a braking working state from a traction state, controlling a first controllable switch SSR1 and a second controllable switch SSR2 in the grid-connected impedance controller 2 to be turned off;
s15: and controlling a controllable switch in the power module 3 to enter a PWM inversion working state.
Specifically, because the tap of the double-tap transformer 1 has been selected for grid connection in the traction mode, the tap of the double-tap transformer 1 does not need to be adjusted, and when the braking operating state needs to be entered, the first controllable switch SSR1 and the second controllable switch SSR2 in the grid-connected impedance controller 2 can be directly controlled to be turned off, and the control signal of the power module 3 is switched, so that the controllable switch in the power module 3 enters the PWM inversion operating state.
Therefore, the controllable grid-connected impedance controller 2 is arranged in the embodiment of the invention, so that whether impedance is merged into the circuit can be switched, a circuit premise is provided for subsequent mode switching, meanwhile, the double-tap transformer 1 is adopted to provide available input voltage for different modes, normal operation of the circuit after mode switching is ensured, the power module 3 cooperates with the transformation of the double-tap transformer 1 and the grid-connected impedance controller 2 in the circuit to change a control signal together to change a working mode, and the circuit can work in working modes such as diode rectification, PWM rectification and PWM inversion, so that the circuit has better compatibility and various operation modes.
Further, when the controllable switch in the power module 3 is controlled to enter the PWM inversion operating state, S151 and S152 may also be included; wherein,
s151: acquiring a current time period;
s152: setting energy feedback starting voltage corresponding to the current time period by utilizing pre-established time domain matching information; the time domain matching information is a corresponding relation between the line daily power curve and the energy feedback starting voltage which is established in advance according to the line daily power curve.
Specifically, time domain control is added in the control process of the power module 3, different energy feedback start-stop voltages are set in different time periods according to a daily power curve of a line, time domain matching information is obtained, if the AC network voltage in a rush hour is reduced, the energy feedback starting voltage is set to be 1600VDC, and when the power module is used at night or at a valley value, the starting voltage is set to be 1630 VDC. Therefore, the energy supply voltage starting value is flexibly planned according to the fluctuation of the bus voltage in the phase period by acquiring the current time period, and the direct current bus voltage raised due to train braking is inverted into alternating current to be fed back to the alternating current power grid.
The embodiment of the invention discloses a specific rail transit power supply and energy feed method, and compared with the previous embodiment, the embodiment further explains and optimizes the technical scheme. Referring to fig. 1 and 3, specifically:
on the basis of the above working mode switching, a working mode switching method of a second mode may also be provided, which specifically includes:
s21: and when the train works in the train traction working state of the second mode, controlling the double-tap transformer 1 to be connected with the tap corresponding to the second mode in a grid mode.
Specifically, the second mode may be a combination of a PWM rectification traction mode and a PWM inversion energy feedback mode, and when the train is in the PWM rectification traction mode, the double-tap transformer 1 may be controlled to provide a 950VAC tap grid connection.
S22: the first controllable switch SSR1 and the second controllable switch SSR2 in the grid-tied impedance controller 2 are controlled to turn off.
Specifically, the first controllable switch SSR1 and the second controllable switch SSR2 are turned off, and the first grid-connected three-phase reactor L1 and the second grid-connected three-phase reactor L2 are connected to the main circuit, so as to form a grid-connected reactance required for control, and perform voltage filtering.
S23: controlling a controllable switch in the power module 3 to enter a PWM rectification working state;
s24: when the train working in the second mode enters a braking working state from a traction state, controlling the first controllable switch SSR1 and the second controllable switch SSR2 in the grid-connected impedance controller 2 to be turned off;
s25: and controlling a controllable switch in the power module 3 to enter a PWM inversion working state.
Specifically, the power module 3 flexibly plans the energy supply voltage starting value according to the fluctuation of the bus voltage in the phase period in the PWM inversion working state, inverts the DC bus voltage raised due to train braking into AC power, and feeds the AC power back to the AC power grid.
Specifically, in the PWM rectification traction mode or the PWM inversion energy feeding mode, the first controllable switch SSR1 and the second controllable switch SSR2 are always turned off, so that the impedance is incorporated into the circuit, and the power module 3 operates in the PWM rectification operating state or the PWM inversion operating state by switching the control signal of the power module 3.
In addition, according to the needs of the power grid, the power module 3 can also perform reactive power transmission and absorption by switching the control signal of the power module 3, so as to perform reactive power compensation.
Correspondingly, the embodiment of the invention also discloses a rail transit power supply and energy feed system, and as shown in fig. 4, the system comprises:
the first tap control module 11 is configured to control the double-tap transformer 1 to be connected to a tap corresponding to the first mode when the train operates in the train traction operating state of the first mode;
the first switch control module 12 is configured to control the first controllable switch SSR1 and the second controllable switch SSR2 in the grid-connected impedance controller 2 to be turned on;
the first power control module 13 is used for controlling the controllable switch in the power module 3 to be turned off, and the diode in the first power control module is used for working in a diode rectification state;
the second switch control module 14 is used for controlling the first controllable switch SSR1 and the second controllable switch SSR2 in the grid-connected impedance controller 2 to be turned off when the train working in the first mode enters a braking working state from a traction state;
and the second power control module 15 is used for controlling the controllable switches in the power module 3 to enter a PWM inversion working state.
Therefore, the controllable grid-connected impedance controller 2 is arranged in the embodiment of the invention, so that whether impedance is merged into the circuit can be switched, a circuit premise is provided for subsequent mode switching, meanwhile, the double-tap transformer 1 is adopted to provide available input voltage for different modes, normal operation of the circuit after mode switching is ensured, the power module 3 cooperates with the transformation of the double-tap transformer 1 and the grid-connected impedance controller 2 in the circuit to change a control signal together to change a working mode, and the circuit can work in working modes such as diode rectification, PWM rectification and PWM inversion, so that the circuit has better compatibility and various operation modes.
Specifically, the power control system can further include a second tap control module, a third switch control module, a third power control module, a third tap control module and a fourth power control module; wherein,
the second tap control module is used for controlling the double-tap transformer 1 to be connected with a tap corresponding to the second mode when the train works in the train traction working state of the second mode;
the third switch control module is used for controlling the first controllable switch SSR1 and the second controllable switch SSR2 in the grid-connected impedance controller 2 to be turned off;
the third power control module is used for controlling a controllable switch in the power module 3 to enter a PWM rectification working state;
the third tap control module is used for controlling the first controllable switch SSR1 and the second controllable switch SSR2 in the grid-connected impedance controller 2 to be turned off when the train working in the second mode enters a braking working state from a traction state;
and the fourth power control module is used for controlling the controllable switch in the power module 3 to enter a PWM inversion working state.
In addition, the embodiment of the invention also discloses a rail transit power supply and energy feed device, which comprises:
a memory for storing a computer program;
a processor for executing a computer program to implement the rail transit power supply and energy feeding method as described above.
In addition, the embodiment of the invention also discloses a computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, and when being executed by a processor, the computer program realizes the rail transit power supply and energy feed method.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The technical content provided by the present invention is described in detail above, and the principle and the implementation of the present invention are explained in this document by applying specific examples, and the above description of the examples is only used to help understanding the method of the present invention and the core idea thereof; 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 (9)
1. A rail transit power supply and energy feed method is characterized by being applied to a rail transit power supply and energy feed circuit and comprising the following steps:
when the train works in a train traction working state in a first mode, controlling a double-tap transformer (1) to be connected with a tap corresponding to the first mode in a grid mode;
controlling a first controllable switch SSR1 and a second controllable switch SSR2 in the grid-connected impedance controller (2) to be conducted;
controlling a controllable switch in the power module (3) to be turned off, and utilizing a diode in the power module to work in a diode rectification state;
when the train working in the first mode enters a braking working state from a traction state, controlling the first controllable switch SSR1 and the second controllable switch SSR2 in the grid-connected impedance controller (2) to be turned off;
controlling a controllable switch in the power module (3) to enter a PWM inversion working state;
wherein, the track traffic power supply and can feed circuit includes: the system comprises a double-tap transformer (1), a grid-connected impedance controller (2) and a power module (3) which are connected in sequence;
the grid-connected impedance controller (2) comprises a first grid-connected three-phase reactor L1, a second grid-connected three-phase reactor L2, a first controllable switch SSR1 and a second controllable switch SSR 2;
the first controllable switch SSR1 is connected in parallel with the first grid-connected three-phase reactor L1, and the second controllable switch SSR2 is connected in parallel with the second grid-connected three-phase reactor L2;
the double-tap transformer (1) comprises two switchable groups of taps which respectively provide different voltage levels.
2. The rail transit power and energy feeding method according to claim 1, characterized in that said first controllable switch SSR1 and said second controllable switch SSR2 are both thyristors.
3. The rail transit power and energy feeding method according to claim 2, characterized in that one set of taps of the double-tap transformer (1) provides 950VAC voltage and the other set of taps provides 1180VAC voltage.
4. The rail transit power and energy feeding method according to claim 1, further comprising:
when the train works in a train traction working state in a second mode, controlling the double-tap transformer (1) to be connected with a tap corresponding to the second mode in a grid mode;
controlling the first controllable switch SSR1 and the second controllable switch SSR2 in the grid-connected impedance controller (2) to be turned off;
controlling a controllable switch in the power module (3) to enter a PWM rectification working state;
when the train working in the second mode enters a braking working state from a traction state, controlling the first controllable switch SSR1 and the second controllable switch SSR2 in the grid-connected impedance controller (2) to be turned off;
and controlling a controllable switch in the power module (3) to enter a PWM inversion working state.
5. The rail transit power and energy feeding method according to claim 1, further comprising:
acquiring a current time period;
setting energy feedback starting voltage corresponding to the current time period by utilizing pre-established time domain matching information;
and the time domain matching information is a corresponding relation between the time domain matching information and the feedable starting voltage which is established in advance according to the line daily power curve.
6. A rail transit power and energy feed system, comprising:
the system comprises a first tap control module, a second tap control module and a control module, wherein the first tap control module is used for controlling a double-tap transformer (1) to be connected with a tap corresponding to a first mode when the train works in a train traction working state of the first mode;
the first switch control module is used for controlling the conduction of a first controllable switch SSR1 and a second controllable switch SSR2 in the grid-connected impedance controller (2);
the first power control module is used for controlling the controllable switch in the power module (3) to be turned off and utilizing a diode in the first power control module to work in a diode rectification state;
the second switch control module is used for controlling the first controllable switch SSR1 and the second controllable switch SSR2 in the grid-connected impedance controller (2) to be turned off when the train working in the first mode enters a braking working state from a traction state;
and the second power control module is used for controlling a controllable switch in the power module (3) to enter a PWM inversion working state.
7. The rail transit power and energy feed system of claim 6, further comprising:
the second tap control module is used for controlling the double-tap transformer (1) to be connected with a tap corresponding to a second mode when the double-tap transformer works in a train traction working state of the second mode;
the second switch control module is used for controlling the first controllable switch SSR1 and the second controllable switch SSR2 in the grid-connected impedance controller (2) to be turned off;
the third power control module is used for controlling a controllable switch in the power module (3) to enter a PWM rectification working state;
the third tap control module is used for controlling the first controllable switch SSR1 and the second controllable switch SSR2 in the grid-connected impedance controller (2) to be turned off when the train working in the second mode enters a braking working state from a traction state;
and the fourth power control module is used for controlling a controllable switch in the power module (3) to enter a PWM inversion working state.
8. A rail transit power supply and energy feed device, characterized by comprising:
a memory for storing a computer program;
a processor for executing the computer program to implement the rail transit power supply and energy feed method according to any one of claims 1 to 5.
9. A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, which computer program, when being executed by a processor, implements the rail transit power supply and energy feed method according to any one of claims 1 to 5.
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| CN202111427582.8A CN113852130B (en) | 2021-11-29 | 2021-11-29 | Power supply and energy supply circuit, method, system, device and storage medium for rail transit |
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| CN202111427582.8A CN113852130B (en) | 2021-11-29 | 2021-11-29 | Power supply and energy supply circuit, method, system, device and storage medium for rail transit |
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| CN211918390U (en) * | 2019-12-24 | 2020-11-13 | 中车株洲电力机车有限公司 | Electric locomotive and no-electric-area power supply system thereof |
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| CN107732895A (en) * | 2017-11-07 | 2018-02-23 | 西南交通大学 | A kind of electric power electric transformer |
| CN207541158U (en) * | 2017-11-23 | 2018-06-26 | 阳光电源股份有限公司 | A kind of PID prevention prosthetic devices of photovoltaic battery panel |
| CN111751635A (en) * | 2019-03-28 | 2020-10-09 | 株洲中车时代电气股份有限公司 | Alternating current network voltage mutation simulation system |
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| CN113852130A (en) | 2021-12-28 |
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