CN111384756A - Voltage-sharing control method and system for rail transit super capacitor energy storage system - Google Patents
Voltage-sharing control method and system for rail transit super capacitor energy storage system Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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Abstract
The invention discloses a voltage-sharing control method and a voltage-sharing control system for a rail transit super-capacitor energy storage system in the technical field of rail transit regenerative electric braking, and the voltage-sharing control method and the voltage-sharing control system comprise an input series side voltage-sharing controller, an output side super-capacitor voltage-sharing controller, a total voltage controller, a plurality of converter current controllers and a super-capacitor overcharge-prevention or overdischarge-prevention voltage-stabilizing controller, wherein the output voltage of the output side of each converter, the input voltage of the input side of each converter and the current of each branch of each converter are respectively collected, and the current given adjustment coefficient of each converter is calculated according to the maximum charging voltage value or the minimum discharging voltage value allowed by the super-capacitor under different working modes and a starting; obtaining the duty ratio of each branch of each converter; and further, voltage-sharing control of a super capacitor on the output side and maximum utilization of the electric charge quantity of the capacitor are achieved, meanwhile, two groups of converters connected in series on the input side are guaranteed to work in a controllable safe voltage interval, and energy generated by regenerative braking of rail transit is efficiently utilized.
Description
Technical Field
The invention belongs to the technical field of regenerative electric braking of rail transit, and particularly relates to a voltage-sharing control method and system for a rail transit super capacitor energy storage system.
Background
The distance between urban rail transit stations is short, the number of stations is large, so that the train is started and braked frequently, at present, the train is generally braked by regenerative electricity, a traction motor runs in a power generation mode during the regenerative electricity braking and feeds back regenerative energy to a traction network, and if the part of energy cannot be consumed by other vehicles on the line, the bus voltage is raised. In order to control the safety of the equipment, the current regenerative braking scheme is mainly divided into a dissipation type, an energy feedback type and an energy storage type. The dissipation type mainly converts the braking energy into heat energy by the braking resistor and is consumed by air braking. Although the resistance braking control mode is simple, the mode not only causes energy waste, but also can raise the tunnel temperature due to a large amount of heat energy, increases the energy consumption of the subway ventilation and heat dissipation device, increases the load of an air conditioning system in an underground station, and increases the operating cost. Therefore, reasonable recycling of the braking energy can be realized, the subway operation cost is saved, and the method plays a very positive role in responding to national energy conservation and emission reduction requirements and building green urban rail transit.
The regenerative braking energy absorption of the energy feedback type is to feed the regenerative energy at the direct current side back to the alternating current power grid for other equipment in the station to use through the power electronic conversion device, so that the problem of tunnel temperature rise caused by resistance braking can be avoided, the environmental protection and the energy saving are realized, but a new power supply system with the feedback function of energy feedback or the whole power supply system needs to be built, the direct current power grid and the alternating current power grid have a coupling relation, and the system is complex.
The energy storage type regenerative braking energy absorption mode is characterized in that a DC-DC converter and a DC energy storage element are additionally arranged on the side of the DC traction network to absorb the redundant regenerative braking energy and inhibit the voltage of the DC traction network from rising; meanwhile, energy is released in the running process of the vehicle, voltage support can be provided for the traction network, and overlarge network voltage fluctuation is avoided. The super capacitor has the characteristic of high power density and is very suitable for the occasions of charging and discharging with frequent energy fluctuation. In the prior art, the super capacitor energy storage system with independent input, series and output has the problems of unbalanced pressure, low utilization rate of the super capacitor, low utilization rate of regenerative braking energy and the like in the regenerative braking energy absorption and release processes.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a voltage-sharing control method and a voltage-sharing control system for a rail transit super-capacitor energy storage system, which realize voltage-sharing control of a super-capacitor at an output side and maximum utilization of the electric charge quantity of the capacitor, simultaneously ensure that two groups of converters connected in series at an input side work in a controllable safe voltage interval, and efficiently utilize energy generated by regenerative braking of rail transit.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a voltage-sharing control method for a rail transit super-capacitor energy storage system comprises the steps of collecting output voltages of output sides of converters, and determining voltage-sharing proportionality coefficients of input sides according to difference values between the output voltages of the output sides of the converters and preset voltage-sharing coefficients; acquiring input voltage of the input side of each converter, and acquiring an output current deviation value of each converter according to the input voltage of the input side of each converter and an input side voltage-sharing proportional coefficient; the sum of the input voltage given target value of the input voltage under different working modes and the input voltage of the input side of each converter is subjected to difference to obtain the total current given target value of each converter; acquiring output voltage of the output side of each converter, and calculating a current given adjustment coefficient of each converter according to the maximum charging voltage value or the minimum discharging voltage value allowed by the super capacitor in different working modes and a starting hysteresis threshold; obtaining the duty ratio of each branch of each converter according to the total current given target value, the output current deviation value, the current given adjustment coefficient and each branch current of each converter; and according to the duty ratio of each branch of each converter, the duty ratio is respectively compared with a triangular carrier to modulate and generate a corresponding PWM signal to drive a power switch of each converter, so that voltage-sharing control of the rail transit super capacitor energy storage system is realized.
Further, the default voltage-sharing coefficient is 1/n, and n represents the number of series-connected sets of the input-side converter of the rail transit super capacitor energy storage system.
Further, the input side voltage-sharing proportionality coefficient is obtained by subtracting output voltages of output sides of the converters, obtaining a voltage-sharing distribution adjustment coefficient through adjustment and amplitude limiting processing of a PI controller, and then overlapping the voltage-sharing distribution adjustment coefficient with a default voltage-sharing coefficient. .
For any converter, the output current deviation value is obtained by summing the input voltages at the input sides of all the converters, multiplying the summed input voltages by the voltage-sharing proportionality coefficient at the input side, and then subtracting the summed input voltages from the input sides of the rest converters.
A voltage-sharing control system of a rail transit super-capacitor energy storage system comprises an input series side voltage-sharing controller, an output side super-capacitor voltage-sharing controller, a total voltage controller, a plurality of converter current controllers and a super-capacitor overcharge-prevention or overdischarge-prevention voltage-stabilizing controller, wherein the output side super-capacitor voltage-sharing controller collects output voltages of output sides of all converters and outputs an input side voltage-sharing proportionality coefficient; the input series side voltage-sharing controller collects input voltage of the input side of each converter and outputs an output current deviation value of each converter to each converter current controller by combining an input side voltage-sharing proportionality coefficient; the total voltage controller switches an input voltage given target value of the total voltage controller according to different working modes and outputs a total current given target value to each converter current controller; the super capacitor anti-overcharge or over-discharge voltage stabilization controller collects output voltages of output sides of all converters and outputs current given adjustment coefficients of all the converters according to maximum charge voltage values or minimum discharge voltage values allowed by the super capacitor in different working modes and a start hysteresis threshold; the converter current controller obtains the duty ratio of each branch of the converter by combining the current of each branch of the converter according to the total current given target value, the output current deviation value and the current given adjustment coefficient of the converter, compares and modulates the duty ratio of each branch with the triangular carrier respectively to generate corresponding PWM signals, drives a power switch of the converter and realizes voltage-sharing control of the rail transit super capacitor energy storage system.
Further, the input series side voltage-sharing controller adopts a PI controller, and the output amplitude limit of the PI controller is set according to the maximum working voltage allowed by the converter.
Furthermore, the super-capacitor overcharge-prevention or overdischarge-prevention voltage stabilization controller comprises an adjustment coefficient amplitude limiting unit and a filtering unit, wherein the amplitude limiting range of the adjustment coefficient amplitude limiting unit is 0-1; the filtering unit adopts a low-pass filter, an average filter or a sliding filter.
Furthermore, the output side super capacitor voltage-sharing controller adopts a PI controller, the output of the PI controller comprises an amplitude limiting link, and the value range of the amplitude limiting value is-0.1.
Further, the output clipping of the total voltage controller is set according to the maximum current allowed by the converter.
Furthermore, the converter current controller comprises a total current controller and a plurality of branch current-sharing controllers, the total current controller and the plurality of branch current-sharing controllers both adopt PI controllers, and the output of the total current controller is superposed with the output of the plurality of branch current-sharing controllers respectively and carries out total output amplitude limiting.
Compared with the prior art, the invention has the following beneficial effects: according to the invention, the duty ratio of each branch current of the converter is obtained by collecting the voltage signals of the input side and the output side of each converter and each branch current of each converter, so that the voltage-sharing control of the output side super capacitor and the maximum utilization of the electric charge quantity of the capacitor are realized, and meanwhile, two groups of converters connected in series at the input side are ensured to work in a controllable safe voltage interval, and the energy generated by regenerative braking of rail transit is efficiently utilized.
Drawings
FIG. 1 is a topological structure diagram of an input-series output independent rail transit super capacitor energy storage system;
fig. 2 is a functional schematic diagram of a voltage-sharing control system of a rail transit super capacitor energy storage system according to an embodiment of the present invention;
FIG. 3 is a block diagram of the overall voltage controller of FIG. 2;
FIG. 4 is a block diagram of the output side supercapacitor voltage sharing controller in FIG. 2;
FIG. 5 is a block diagram of the input series side voltage sharing controller of FIG. 2;
FIG. 6 is a block diagram of the super capacitor anti-overcharge or over-discharge voltage regulator controller of FIG. 2;
FIG. 7 is a block diagram of a current controller for converter I of FIG. 2;
fig. 8 is a block diagram of the current controller of converter ii of fig. 2.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1, a topology structure diagram of a super capacitor energy storage system for input-series output independent rail transit is formed by connecting two identical three-branch-circuit parallel DC-DC converters i and ii with super capacitors through input-series output independently, and the input side is connected with a 1500V direct current traction network; the two groups of independent converters are connected in parallel by three-branch full-bridge output through a filter reactor and converge, and high-frequency harmonic components are filtered by a filter capacitor. Two groups of independent converters respectively acquire input voltage at input sideU in_1 、U in_2 Three branches of output currenti out_11 、i out_12 、i out_13 、i out_21 、i out_22 、i out_23 And an output voltageU out_1 、U out_2 。
The first embodiment is as follows:
based on the rail transit super-capacitor energy storage system shown in fig. 1, which includes two groups of independent input, series connection and output, the present embodiment provides a voltage-sharing control method for a rail transit super-capacitor energy storage system, which includes,
respectively collecting output voltages of output sides of converter I and converter IIU out_1 AndU out_2 will beU out_1 AndU out_2 making difference, regulating by PI controller and amplitude limiting to obtain voltage-sharing distribution adjustment coefficient, and superposing with default voltage-sharing coefficient 0.5 as input-side voltage-sharing proportionality coefficientk vot_Equal ；
Respectively collecting input voltages at input sides of converter I and converter IIU in_1 AndU in_2 will beU in_1 AndU in_2 voltage-sharing proportionality coefficient between summed and input sidek vot_Equal Multiplied by the input voltage at the input side of converter I or converter IIU in_1 OrU in_2 Obtaining the output current deviation value of each converter by differencei ref_Equal (ii) a When the rail transit super capacitor energy storage system is formed by more than two groups of completely identical three-branch-circuit parallel DC-DC converters which are independently connected with super capacitors through input, series and output, respectively acquiring input voltages at the input sides of the converters, summing the input voltages, multiplying the summed input voltages by a voltage-sharing proportional coefficient at the input side, and then subtracting the summed input voltages at the input sides of the other converters except any converter to obtain an output current deviation value of each converter;
setting the input voltage in the charging mode to a target valueU ref_Buck Or input voltage in discharge mode to a given target valueU ref_Boost And sum of input voltages at input side of each converterU in Making difference to obtain total current given target value of each converteri ref ；
Respectively collecting output voltages of output sides of converter I and converter IIU out_1 AndU out_2 according to the maximum charging voltage value allowed by the super capacitor in the charging modeU C_Max Or minimum discharge voltage value in discharge modeU C_Min And start hysteresis thresholdU ctd Calculating the current setting adjustment coefficient of each converterM C1 AndM C2 ；
setting a target value according to the total current of each converteri ref Deviation value of output currenti ref_Equal And current setting adjustment factorM C1 AndM C2 the duty ratio of each branch of the converter I is obtained by combining the branch current of each converterD 11 、D 12 、D 13 And the duty ratio of each branch of the converter IID 21 、D 22 、D 23 ；
According to the duty ratio of each branch of each converter, the duty ratio is respectively compared with a triangular carrier to generate respective PWM (pulse width modulation) signals, power switching devices of an upper group of converters and a lower group of converters are driven, and voltage-sharing control on the input side and the output side of the rail transit super capacitor energy storage system is achieved.
Example two:
a voltage-sharing control system of a track traffic super capacitor energy storage system is shown in figures 1 and 2 and comprises an input series side voltage-sharing controller 1, an output side super capacitor voltage-sharing controller 3, a total voltage controller 4, a current controller 5 of a converter I, a current controller 6 of a converter II and a super capacitor overcharge or overdischarge prevention voltage-stabilizing controller 2, wherein the output side super capacitor voltage-sharing controller 3 collects output voltages of output sides of the converter I and the converter IIU out_1 AndU out_2 and outputs the input side voltage-sharing proportionality coefficientk vot_Equal (ii) a The input series side voltage-sharing controller 1 collects input voltages of input sides of a converter I and a converter IIU in_1 AndU in_2 and combined with input side voltage-sharing proportionality coefficientk vot_Equal Outputting current deviation values to current controller 5 of converter I and current controller 6 of converter IIi ref_Equal (ii) a The total voltage controller 4 switches the input voltage given target value of the total voltage controller 4 according to different working modes and outputs the total current given target value to each converter current controlleri ref (ii) a The super-capacitor overcharge-prevention or overdischarge-prevention voltage stabilizing controller 2 respectively collects output voltages of output sides of the converter I and the converter IIU out_1 AndU out_2 according to the maximum charging voltage value allowed by the super capacitor in the charging modeU C_Max Or in discharge modeMinimum discharge voltage valueU C_Min And start hysteresis thresholdU ctd Calculating the current setting adjustment coefficient of each converterM C1 AndM C2 (ii) a Converter I current controller 5 sets a target value according to the total currenti ref Deviation value of output currenti ref_Equal And current setting adjustment factorM C1 The duty ratio of each branch of the converter I is obtained by combining the branch current of each converterD 11 、D 12 、D 13 (ii) a Converter II current controller 6 sets a target value according to the total currenti ref Deviation value of output currenti ref_Equal And current setting adjustment factorM C2 Combining each branch current of each converter to obtain duty ratio of each branch of converter IID 21 、D 22 、D 23 (ii) a And according to the duty ratio of each branch of each converter, the duty ratio is respectively compared with a triangular carrier to modulate and generate respective PWM signals to drive power switching devices of an upper group of converters and a lower group of converters, so that voltage-sharing control on the input side and the output side of the rail transit super capacitor energy storage system is realized. According to the embodiment, the voltage-sharing control of two groups of independent supercapacitors on the output side and the maximum utilization of the electric charge quantity of the capacitors are realized through the coordination control of six control units, and meanwhile, two groups of converters connected in series on the input side are ensured to work in a controllable safety voltage interval, so that the energy generated by regenerative braking of rail transit is efficiently utilized.
As shown in fig. 1, 2, and 3, the total voltage controller 4 sets the input voltage in the charge mode to a target valueU ref_Buck Or input voltage in discharge mode to a given target valueU ref_Boost And sum of input voltages at input side of each converterU in Making difference, and using the difference as the total current set target value of the current controller 5 of the converter I and the current controller 6 of the converter II through a PI controller and an output amplitude limiting linki ref . In this embodiment, the maximum allowable value of the converter I and the converter IIThe current setting controller outputs amplitude limit to avoid the device overcurrent.
As shown in fig. 1, 2 and 4, the output-side supercapacitor voltage-sharing controller 3 collects the output voltages of two groups of supercapacitors C1 and C2 in real timeU Out_1 、U Out_2 I.e. the output voltage at the output side of the converter IU out_1 And the output voltage of the output side of the converter IIU out_2 Will beU Out_1 AndU Out_2 making difference, regulating by PI controller and amplitude limiting to output a voltage-sharing distribution adjustment coefficient, and superposing with default voltage-sharing coefficient 0.5 as input-side voltage-sharing proportionality coefficientk vot_Equal (ii) a Meanwhile, the actual safe working area of the device is considered, and the value range of the output amplitude limiting value of the controller is-0.1.
As shown in fig. 1, 2 and 5, the input series side voltage-sharing controller 1 respectively collects the input voltages at the input sides of the converter i and the converter ii in real timeU in_1 AndU in_2 will beU in_1 AndU in_2 voltage-sharing proportionality coefficient between summed and input sidek vot_Equal Multiplied by the input voltage at the input side of converter I or converter IIU in_1 OrU in_2 Obtaining the output current deviation value of each converter by differencei ref_Equal As inputs to converter i current controller 5 and converter ii current controller 6; when the rail transit super capacitor energy storage system is formed by more than two groups of completely identical three-branch-circuit parallel DC-DC converters which are independently connected with super capacitors through input, series and output, respectively acquiring input voltages at the input sides of the converters, summing the input voltages, multiplying the summed input voltages by a voltage-sharing proportional coefficient at the input side, and then subtracting the summed input voltages at the input sides of the other converters except any converter to obtain an output current deviation value of each converter; the input series side voltage-sharing controller 1 adopts a PI controller, and sets the output amplitude limit of the PI controller according to the maximum working voltage allowed by the converter. The output of the input series side voltage-sharing controller 1 is two groups of converter output currentsUsing the current to adjust the input side voltageU in_1 AndU in_2 and the amplitude limiting value is optimally set to be 10% of the rated current of the converter according to actual needs.
As shown in fig. 1, 2, 6, due to the internal resistance of supercapacitors C1 and C2R C1 AndR C2 the charging or discharging mode is set to be a charging mode, and the charging or discharging mode is set to be a charging mode, wherein the charging mode is set to be a charging mode, and the charging mode is set to be a discharging modeU C_Max Or minimum discharge voltage valueU C_Min And start hysteresis thresholdU ctd Calculating to obtain current setting adjustment coefficients of converter I and converter IIM C1 AndM C2 and 1/40 is taken by starting a hysteresis threshold, namely when the difference value between the voltage real-time value of the super capacitor and the set maximum or minimum value is within 40V, the super capacitor over-charge prevention or over-discharge voltage stabilization controller 2 acts, and the output current is linearly reduced by utilizing the output adjustment coefficient, so that the current rapid change caused by direct voltage judgment can be avoided, and meanwhile, the charge quantity of the super capacitor can be fully utilized. The different operating modes include in particular a charging mode and a discharging mode, i.e. energy absorption and energy release. The super-capacitor overcharge-preventing or overdischarge-preventing voltage stabilizing controller 2 comprises an adjusting coefficient amplitude limiting unit and a filtering unit, and the amplitude limiting range of the adjusting coefficient amplitude limiting unit is set to be 0-1; the filtering unit adopts a low-pass filter, an average filter or a sliding filter.
As shown in fig. 1, 2 and 7, the current controller 5 of the converter i comprises a total current controller and three branch current-sharing controllers; the total current controller and the three branch current-sharing controllers adopt PI controllers, the output of the total current controller is respectively superposed with the output of the three branch current-sharing controllers, and the total output amplitude limiting is carried out to obtain the duty ratio of each independent branch; the branch current-sharing controller takes the average value of the total current of the three branches as a given value, and performs current-sharing control by making a difference with the current of each branch.As shown in fig. 8, the topology of the converter ii current controller 6 is identical to that of the converter i current controller 5, with the main difference being the input side voltage-sharing control component in a given amount of the total current loopi ref_Equal Given opposite signs, the regulation coefficient for preventing the output of the super capacitor from being overcharged or overdischarged isM C2 And the feedback current is controlled by adopting the output current corresponding to the converter II.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A voltage-sharing control method of a track traffic super-capacitor energy storage system is characterized by comprising the following steps,
acquiring output voltages of output sides of the converters, and determining a voltage-sharing proportionality coefficient of an input side according to a difference value between the output voltages of the output sides of the converters and a preset voltage-sharing coefficient;
acquiring input voltage of the input side of each converter, and acquiring an output current deviation value of each converter according to the input voltage of the input side of each converter and an input side voltage-sharing proportional coefficient;
the sum of the input voltage given target value of the input voltage under different working modes and the input voltage of the input side of each converter is subjected to difference to obtain the total current given target value of each converter;
acquiring output voltage of the output side of each converter, and calculating a current given adjustment coefficient of each converter according to the maximum charging voltage value or the minimum discharging voltage value allowed by the super capacitor in different working modes and a starting hysteresis threshold;
obtaining the duty ratio of each branch of each converter according to the total current given target value, the output current deviation value, the current given adjustment coefficient and each branch current of each converter;
and according to the duty ratio of each branch of each converter, the duty ratio is respectively compared with a triangular carrier to modulate and generate a corresponding PWM signal to drive a power switch of each converter, so that voltage-sharing control of the rail transit super capacitor energy storage system is realized.
2. The rail transit super-capacitor energy storage system voltage-sharing control method according to claim 1, wherein the default voltage-sharing coefficient is 1/n, and n represents the number of series-connected groups of input-side converters of the rail transit super-capacitor energy storage system.
3. The rail transit super capacitor energy storage system voltage-sharing control method according to claim 1, wherein the input side voltage-sharing proportionality coefficient is obtained by subtracting output voltages of output sides of the converters, obtaining a voltage-sharing distribution adjustment coefficient through adjustment and amplitude limiting processing of a PI controller, and then overlapping the voltage-sharing distribution adjustment coefficient with a default voltage-sharing coefficient.
4. The rail transit super capacitor energy storage system voltage-sharing control method according to claim 1, wherein for any converter, the output current deviation value is obtained by summing the input voltages at the input sides of all the converters, multiplying the summed input voltages by the voltage-sharing proportionality coefficient at the input side, and then subtracting the summed input voltages from the input sides of the rest of the converters.
5. A voltage-sharing control system of a track traffic super capacitor energy storage system is characterized by comprising an input series side voltage-sharing controller, an output side super capacitor voltage-sharing controller, a total voltage controller, a plurality of converter current controllers, a super capacitor overcharge prevention or over discharge voltage-stabilizing controller,
the output side super capacitor voltage-sharing controller collects output voltages of output sides of the converters and outputs voltage-sharing proportionality coefficients of input sides;
the input series side voltage-sharing controller collects input voltage of the input side of each converter and outputs an output current deviation value of each converter to each converter current controller by combining an input side voltage-sharing proportionality coefficient;
the total voltage controller switches an input voltage given target value of the total voltage controller according to different working modes and outputs a total current given target value to each converter current controller;
the super capacitor anti-overcharge or over-discharge voltage stabilization controller collects output voltages of output sides of all converters and outputs current given adjustment coefficients of all the converters according to maximum charge voltage values or minimum discharge voltage values allowed by the super capacitor in different working modes and a start hysteresis threshold;
the converter current controller obtains the duty ratio of each branch of the converter by combining the current of each branch of the converter according to the total current given target value, the output current deviation value and the current given adjustment coefficient of the converter, compares and modulates the duty ratio of each branch with the triangular carrier respectively to generate corresponding PWM signals, drives a power switch of the converter and realizes voltage-sharing control of the rail transit super capacitor energy storage system.
6. The rail transit super capacitor energy storage system voltage-sharing control system as claimed in claim 5, wherein the input series side voltage-sharing controller is a PI controller, and the output amplitude limit of the PI controller is set according to the maximum allowable working voltage of the converter.
7. The rail transit super capacitor energy storage system voltage-sharing control system according to claim 5, wherein the super capacitor anti-overcharging or overdischarging voltage-stabilizing controller comprises an adjustment coefficient amplitude limiting unit and a filtering unit, and the amplitude limiting range of the adjustment coefficient amplitude limiting unit is 0-1; the filtering unit adopts a low-pass filter, an average filter or a sliding filter.
8. The rail transit super-capacitor energy storage system voltage-sharing control system as claimed in claim 5, wherein the output side super-capacitor voltage-sharing controller adopts a PI controller, the output of the PI controller comprises an amplitude limiting link, and the value range of the amplitude limiting value is-0.1.
9. The rail transit super capacitor energy storage system voltage sharing control system according to claim 5, wherein the output amplitude limit of the total voltage controller is set according to the maximum current allowed by the converter.
10. The rail transit super-capacitor energy storage system voltage-sharing control system of claim 5, wherein the converter current controller comprises a total current controller and a plurality of branch current-sharing controllers, each of the total current controller and the branch current-sharing controllers adopts a PI controller, and the output of the total current controller is respectively superposed with the outputs of the branch current-sharing controllers and carries out total output amplitude limiting.
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