CN114498706B - Urban rail hybrid regenerative energy utilization system control method based on power distribution - Google Patents
Urban rail hybrid regenerative energy utilization system control method based on power distribution 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/14—Balancing the load in a network
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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
- H02J3/381—Dispersed generators
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Abstract
The invention discloses a control method of an urban rail hybrid regenerative energy utilization system based on power distribution, which comprises the steps of collecting electric quantity in real time, setting a reference threshold value, controlling a converter voltage outer ring and distributing system power; and respectively carrying out current inner loop closed-loop control on three-phase current at the wire outlet end of the energy feeding system and current of the energy storage system according to the energy feeding system reference power and the energy storage system reference current after the system power distribution, and respectively generating pulse waves to control the grid-connected inverter and the energy storage converter in real time. The invention has the advantages that the centralized control of the energy storage system and the energy feed system is realized, and the reliability of the system is improved; the dynamic power distribution method provided solves the defects of excessive feedback and insufficient feedback in the traditional method; the control method does not need to collect the train power in the power supply interval, and reduces the collection amount.
Description
Technical Field
The invention relates to the technical field of urban rail transit energy conservation, in particular to a control method of an urban rail hybrid regenerative energy utilization system based on power distribution.
Background
The urban rail transit has the advantages of large transportation capacity, high speed, energy conservation, environmental protection and the like, and is developed vigorously in recent years. During the braking process of the urban rail train, a regenerative braking mode is preferentially adopted to generate a large amount of electric energy (regenerative energy). However, most traction substations of urban rail transit adopt a unidirectional rectification mode at present, regenerated energy cannot be fed back to an alternating current power grid, and if no traction train absorbs energy in the same power supply interval, the direct current bus voltage is rapidly increased. In order to avoid the overvoltage phenomenon, the braking train limits the regenerative energy, for example, the input braking resistor is consumed in the form of heat energy, but the mode wastes energy, increases the heating value, causes the temperature rise in the tunnel, and the like.
In order to effectively utilize the regenerated energy of urban rail transit, the current better utilization modes comprise train operation optimization, energy feed system addition and energy storage system addition. The method has the advantages that the train operation optimization is realized, namely, the train operation diagram is optimized, more regenerative braking energy is utilized by traction trains in the same power supply interval, no additional equipment is needed, the cost is low, and the energy utilization rate of the method depends on the running organization seriously. The added energy feed system and the added energy storage system are both used for improving the utilization rate of regenerative braking energy by additionally arranging the tide control equipment, but the problems of weak impact power resistance capability of the energy feed system and low energy density of the energy storage system result in the problems of large volume, low capacity utilization efficiency, high investment cost and the like of a single type of urban rail regenerative energy utilization system. Therefore, the urban rail hybrid type regenerated energy utilization system combining the energy storage system and the energy feed system can realize the advantage complementation of the energy storage system and the energy feed system, reduce the system cost while ensuring the utilization rate of the regenerated energy, and has great advantages.
However, in the existing urban rail hybrid regenerative energy utilization system, separate modulation and control are adopted for the control methods of the energy storage system and the energy feed system, so that the reliability is low, and the existing energy feed system mostly adopts constant power feedback and has the defects of excessive feedback and insufficient feedback.
Disclosure of Invention
The invention provides a control method of an urban rail hybrid regenerative energy utilization system based on power distribution, which considers the change of dynamic load on the basis of the traditional voltage and current double closed-loop control method.
The technical scheme for realizing the purpose of the invention is as follows:
the urban rail hybrid type regenerative energy utilization system control method based on power distribution comprises the following steps:
step one, collecting electric quantity in real time, comprising: DC bus voltage U dc Voltage of energy storage system U sc Current of energy storage system I sc Energy storage system state of charge SoC, energy feed system outlet terminal three-phase current I fa 、I fb 、I fc Three-phase voltage U for medium-voltage network or low-voltage distribution network load load_a 、U load_b 、U load_c And three-phase current I load_a 、I load_b 、I load_c (ii) a By U load_a 、U load_b 、U load_c And I load_a 、I load_b 、I load_c Calculating to obtain the total load power P of the medium-voltage network or the low-voltage distribution network load ；
Step two, setting a reference threshold value, comprising: traction threshold voltage U tr Braking threshold voltage U re Upper limit of state of charge SoC of energy storage system max Lower limit of state of charge SoC of energy storage system min Maximum discharge power P of energy storage system dis_m Maximum charging power P of energy storage system char_m Maximum feedback power P of energy feedback system fm And the maximum value I of the output current of the braking voltage loop re_m (ii) a From P char_m 、P fm And I re_m And calculating to obtain the maximum value of the output current of the brake voltage ring distributed to the energy feedback system
Step three, the converter voltage outer loop control comprises the following steps: will U tr And U dc The difference value is modulated by a PI regulator to obtain the output current I of a traction voltage ring tr Will U dc And U re The difference value of the two is modulated by a PI regulator to obtainTo the braking voltage loop output current I re ；
Step four, distributing system power to obtain energy feedback system reference power P f_ref And energy storage system reference current I sc_ref (ii) a 4.1 determining the system operation mode:
such as U dc >U re Skipping to the next step, otherwise, further judging U dc <U tr And SoC>SoC min If the system operation mode is the energy storage mode, if the system operation mode is not the idle mode, the system operation mode is the energy storage mode;
such as-I re <＝I f_re_m and-P re <＝P load The system operation mode is the first mode in the energy feedback mode, otherwise, the SoC is further judged>SoC max If the system operation mode is the mixed mode, if the system operation mode is not the second mode, the system operation mode is the second mode in the energy feedback mode;
wherein, P re Is I re In response to the power of the power source,
4.2 System Power is distributed according to System operation mode:
idle mode, system power allocation of
Energy storage mode, further judging I tr <P dis_m /U sc If true, the system power is allocated as
If not, the system power is allocated as->
Energy-feeding mode:
in a first mode, system power is allocated as
Second mode, further judging-I re >I f_re_m And P is load >P fm If true, the system power is allocated as
If not, the system power is allocated as->
Mixed mode:
such as-I re >I f_re_m And P is load >P fm If yes, calculating the residual current I after the output current of the brake voltage ring is distributed by the energy feedback system sc_re1 ＝I re +I f_re_m Further judgment of-I sc_re1 <P char_m /U sc If true, the system power is allocated as
If not, the system power allocation is->
Such as-I re >I f_re_m And P is load >P fm If the residual current is false, the residual current after the output current of the braking voltage ring is distributed by the energy feedback system is calculated
Further judgment of-I sc_re2 <P char_m /U sc If true, the system power is allocated as
If not, the system power allocation is->
Step five, P after the power distribution of the system is obtained f_ref And I sc_ref Respectively to three-phase current I at the line outlet of energy-feedback system fa 、I fb 、I fc And energy storage system current I sc And carrying out current inner loop closed-loop control, and respectively generating pulse waves to control the grid-connected inverter and the energy storage converter in real time.
Compared with the prior art, the invention has the beneficial effects that:
(1) The control of the energy storage system and the energy feed system is not independent any more, which is beneficial to realizing the centralized control of the system and improving the reliability of the system.
(2) The dynamic power distribution can realize accurate feedback according to the load demand according to the load power change of the medium-voltage network or the low-voltage distribution network, has small impact on the medium-voltage network or the low-voltage distribution network, and solves the defects of excessive feedback and insufficient feedback in the traditional method.
(3) The control method does not need to collect the train power in the power supply interval, and only needs to indirectly obtain the power condition of the traction power supply system through the voltage change of the direct-current bus, so that the collection amount is reduced.
Drawings
FIG. 1 is a basic flow diagram of the present invention.
Fig. 2 is a schematic diagram of the electrical quantity required to be collected according to the present invention.
Fig. 3 is a schematic diagram of the present invention.
Fig. 4 is a flow chart of the operation of the power distribution module of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings.
A control method of an urban rail hybrid type regenerative energy utilization system based on power distribution is disclosed, and the basic flow is shown in figure 1, and comprises the following steps:
step one, detecting the electric quantity in real time by an electric quantity detection device installed in the substation, and transmitting information to a control system in real time, wherein a schematic diagram of the electric quantity required to be collected by the control method is shown in fig. 2.
The real-time electric quantity acquisition comprises the following steps: DC bus voltage U dc Voltage U of energy storage system sc Current I of energy storage system sc Energy storage system state of charge SoC energy feedbackThree-phase current (I) of system outlet terminal fa ,I fb ,I fc ) Three-phase voltage (U) for medium-voltage or low-voltage network loads load_a ,U load_b ,U load_c ) And three-phase current (I) load_a ,I load_b ,I load_c )。
The calculation processing includes: the total load power P of the medium-voltage network or the low-voltage distribution network is calculated by the three-phase voltage and the three-phase current of the load of the medium-voltage network or the low-voltage distribution network load 。
And step two, setting a system reference threshold value required by the control method according to the collected electrical quantity information.
The system reference threshold to be set includes: traction threshold voltage U tr Braking threshold voltage U re And the upper limit of the state of charge (SOC) of the energy storage system max Lower limit SoC of state of charge of energy storage system min Maximum discharge power P of energy storage system dis_m Maximum charging power P of energy storage system char_m Maximum feedback power P of energy feedback system fm And the maximum value I of the output current of the braking voltage loop re_m 。
The calculation processing includes: maximum charging power P of energy storage system char_m Maximum feedback power P of energy feedback system fm And the maximum value I of the output current of the braking voltage loop re_m And calculating to obtain the maximum value I of the output current of the brake voltage ring distributed to the energy feedback system f_re_m ，
Step three, the voltage U of the direct current bus is used dc And two threshold voltages U tr 、U re And performing outer ring control on the converter voltage.
As shown in the "voltage outer loop" module in fig. 3, the specific steps include:
will pull a threshold voltage U tr And DC bus voltage U dc Subtracting to obtain a difference value, modulating by a PI regulator to obtain a traction voltage loop output current I tr ；
Will direct currentBus voltage U dc And a braking threshold voltage U re Subtracting to obtain a difference value, modulating by a PI regulator to obtain the output current I of the brake voltage ring re 。
Step four, system power distribution is carried out to obtain energy feedback system reference power P f_ref And the energy storage system reference current I sc_ref 。
As shown in the "power distribution" block in fig. 3, the input electrical quantities include: DC bus voltage U dc The total load power P of the energy storage system in charge state SoC, the medium-voltage network or the low-voltage distribution network load Traction voltage loop output current I tr And the output current I of the braking voltage loop re . The required system reference threshold is shown in step two.
The calculation processing includes: current I output by braking voltage loop re Maximum value I of output current of brake voltage loop re_m Maximum charging power P of energy storage system char_m Maximum feedback power P of energy feedback system fm And calculating to obtain the corresponding power P of the output current of the brake voltage ring re ，
As shown in fig. 4, the system power allocation module specifically processes as follows:
4.1 operating mode selection
Determining the operation mode of the system according to the relation between different electrical quantities and the system reference threshold, wherein the specific process is as follows:
s001, judging U dc >U re If the situation is established, namely whether the regenerative braking energy needs to be utilized in the power supply interval or not, if so, entering S003; if not, entering S002;
s002, judging U dc <U tr And SoC>SoC min Whether the energy storage mode is established or not is judged, namely whether a traction load requirement exists in a power supply interval or not and the energy storage system can release energy, if yes, S201 is entered, and the system operation mode is an energy storage mode; if not, S101 is entered, and the system operation mode is an idle mode;
s003, judgment-I re <＝I f_re_m and-P re <＝P load If the condition is met, namely whether the regenerative braking power value meets the load requirement of the medium-voltage network or the low-voltage distribution network and is within the maximum feedback power range of the energy feedback system, if so, S301 is entered, and the system operation mode is the energy feedback mode; if not, entering S004;
s004, judging SoC>SoC max If the situation is established, namely after the energy feedback system feeds back power, the braking energy is still left, and the energy storage system can store energy, if so, the S401 is entered, and the system operation mode is a mixed mode; if not, entering S302, wherein the system operation mode is an energy feedback mode;
4.2 operating Condition partitioning and Power distribution
Dividing system operation conditions according to different operation modes of the system, and performing power distribution, wherein the specific process is as follows:
(1) Idle mode
The system operates in an idle mode, which indicates that the energy storage system and the energy feed system are both in an idle state, and the operation condition division steps in the idle mode are as follows:
s101, the system operates in a working condition 1, no regenerative braking energy is generated, and the energy storage system and the energy feedback are both in an idle state, so that all power required by loads of the medium-voltage network or the low-voltage distribution network is provided by the medium-voltage network or the low-voltage distribution network, the traction power required by a train is provided by a traction substation, and the reference power P of the energy feedback system is provided in the working condition 1 f_ref And energy storage system reference current I sc_ref The assignment results are as follows:
(2) Energy storage mode
The system runs in an energy storage mode, which indicates that the energy storage system is in a working state and the energy feed system is in an idle state, and the steps of the operation condition division in the energy storage mode are as follows:
s201, judging I tr <P dis_m /U sc Whether it is true, i.e. negative power supply interval tractionWhether the power required by the load is within the range of the energy-releasing power of the energy storage system or not is judged, if yes, S202 is carried out; if not, entering S203;
s202, the system operates in a working condition 2, a traction load requirement exists in a power supply interval, the energy feedback system is in an idle state, the energy storage system is in a discharge state, and the required traction power is smaller than the maximum discharge power of the energy storage system, so that the required power of the load of the medium-voltage network or the low-voltage distribution network is completely provided by the medium-voltage network or the low-voltage distribution network, the traction power required by the power supply interval is completely provided by the energy storage system, and the reference power P of the energy feedback system is provided in the working condition 2 f_ref And energy storage system reference current I sc_ref The assignment results are as follows:
s203, the system operates in a working condition 3, a traction load requirement exists in a power supply interval, the energy feedback system is in an idle state, the energy storage system is in a discharge state, the required traction power is larger than or equal to the maximum discharge power of the energy storage system, therefore, the required power of the load of the medium-voltage network or the low-voltage distribution network is completely provided by the medium-voltage network or the low-voltage distribution network, the energy storage system discharges with the maximum discharge power, the traction power required by the power supply interval is provided by the energy storage system and the traction substation together, and the reference power P of the energy feedback system is provided when the working condition is 3 f_ref And energy storage system reference current I sc_ref The assignment results are as follows:
(3) Energy feed mode
The system operates in an energy feedback mode, which indicates that the energy feedback system is in a working state, the energy storage system is in an idle state, and the operation condition division steps in the energy feedback mode are as follows:
s301, the system operates in a working condition 4, regenerative braking energy needs to be utilized in a power supply interval, the energy storage system is in an idle state, the energy feedback system is in a working state, and the numerical value of the regenerative braking power is metThe load of the medium-voltage network or the low-voltage distribution network is in the full power demand and in the maximum feedback power range of the energy feedback system, so the residual regenerative braking energy is completely fed back to the medium-voltage network or the low-voltage distribution network, and the reference power P of the energy feedback system is fed when the working condition is 4 f_ref And energy storage system reference current I sc_ref The assignment results are as follows:
s302, judgment-I re >I f_re_m And P is load >P fm If the maximum feedback power range is not within the set maximum feedback power range, the method enters S303; if not, entering S304;
s303, the system operates in a working condition 5, regenerative braking energy is required to be utilized in a power supply interval, the energy storage system is in an idle state, the energy feedback system is in a working state, the regenerative braking power value and the load requirement of the medium-voltage network or the low-voltage distribution network both exceed the maximum feedback power range of the energy feedback system, therefore, the energy feedback system performs feedback with the maximum feedback power, the residual regenerative braking energy after feedback is consumed by the braking resistance of the train, the power required by the load of the medium-voltage network or the low-voltage distribution network is provided by the energy feedback system and the medium-voltage network or the low-voltage distribution network together, and the reference power P of the energy feedback system is provided by the energy feedback system and the medium-voltage network or the low-voltage distribution network when the working condition 5 is met f_ref And energy storage system reference current I sc_ref The assignment results are as follows:
s304, the system operates in the working condition 6, the regenerative braking energy is required to be utilized in the power supply interval, the energy storage system is in an idle state, the energy feedback system is in a working state, the regenerative braking power value exceeds the load requirement of the medium-voltage network or the low-voltage distribution network, and the load requirement of the medium-voltage network or the low-voltage distribution network does not exceed the maximum feedback power of the energy feedback system, so that the energy feedback system uses the medium-voltage network or the low-voltage distribution network to loadThe feedback is carried out on demand, the residual regenerative braking energy after the feedback is consumed by the train braking resistor, the power required by the load of the medium-voltage network or the low-voltage distribution network is completely provided by the energy feedback system, and the reference power P of the energy feedback system is provided when the working condition is 6 f_ref And energy storage system reference current I sc_ref The assignment results are as follows:
(4) Mixed mode
The system operates in a mixed mode, the energy storage system and the energy feedback system are both in working states, and the operation working condition division steps in the mixed mode are as follows:
s401, judgment-I re >I f_re_m And P is load >P fm If the maximum feedback power range is not met, namely the regenerative braking power value and the load demand of the medium-voltage network or the low-voltage distribution network exceed the maximum feedback power range of the energy feedback system, if yes, the S402 is carried out; if not, the process proceeds to S406
S402, when the step S401 is established, calculating the residual current I of the output current of the brake voltage ring after the output current is distributed by the energy feedback system at the moment sc_re1 After the calculation is completed, the process proceeds to S403; i is sc_re1 The calculation expression is:
I sc_re1 ＝I re +I f_re_m ；
s403, judgment-I sc_re1 <P char_m /U sc If the situation is established, namely whether the residual regenerative braking energy after feedback of the energy feedback system can be completely stored by the energy storage system is judged, if yes, the step S404 is executed; if not, entering S405;
s404, the system operates in a working condition 7, regenerative braking energy is required to be utilized in a power supply interval, the energy feedback system is in a working state, the energy storage system is in a charging state, the regenerative braking power value and the load requirement of the medium-voltage network or the low-voltage distribution network exceed the maximum feedback power range of the energy feedback system, and the residual regenerative braking energy after the feedback of the energy feedback system can be completely stored by the energy storage system, so that the energy feedback system performs feedback with the maximum feedback power, and the residual regenerative braking energy after the feedback is finishedThe energy storage system stores the power required by the load of the medium-voltage network or the low-voltage distribution network, the energy feed system and the medium-voltage network or the low-voltage distribution network provide the power together, and the energy feed system reference power P is fed when the working condition is 7 f_ref And the energy storage system reference current I sc_ref The assignment results are as follows:
s405, the system operates in a working condition 8, regenerative braking energy is required to be utilized in a power supply interval, the energy feedback system is in a working state, the energy storage system is in a charging state, the value of the regenerative braking power and the load demand of the medium-voltage network or the low-voltage distribution network both exceed the maximum feedback power range of the energy feedback system, and the residual regenerative braking energy after the feedback of the energy feedback system cannot be completely stored by the energy storage system, so that the energy feedback system performs feedback with the maximum feedback power, the energy storage system performs charging with the maximum charging power, the rest energy is consumed by a train braking resistor, the power required by the load of the medium-voltage network or the low-voltage distribution network is provided by the energy feedback system and the medium-voltage network or the low-voltage distribution network together, and the reference power P of the energy feedback system is provided when the working condition 8 is adopted f_ref And the energy storage system reference current I sc_ref The assignment results are as follows:
s406, when the S401 is not established, calculating the residual current I of the output current of the brake voltage ring after the output current is distributed by the energy feedback system at the moment sc_re2 After the calculation is completed, the process proceeds to S407; i is sc_re2 The calculation expression is:
s407, judgment-I sc_re2 <P char_m /U sc If the situation is established, namely whether the residual regenerative braking energy after feedback of the energy feedback system can be completely stored by the energy storage system is judged, if yes, the step S408 is carried out;if not, entering S409;
s408, the system operates in a working condition 9, regenerative braking energy is required to be utilized in a power supply interval, the energy feedback system is in a working state, the energy storage system is in a charging state, the value of the regenerative braking power exceeds the load requirement of the medium-voltage network or the low-voltage distribution network, the load requirement of the medium-voltage network or the low-voltage distribution network does not exceed the maximum feedback power of the energy feedback system, the residual regenerative braking energy after the feedback of the energy feedback system can be completely stored by the energy storage system, therefore, the energy feedback system feeds back the load requirement of the medium-voltage network or the low-voltage distribution network, the residual regenerative braking energy after the feedback is completely stored by the energy storage system, the power required by the load of the medium-voltage network or the low-voltage distribution network is completely provided by the energy feedback system, and the reference power P of the energy feedback system is required when the working condition 9 is adopted f_ref And the energy storage system reference current I sc_ref The assignment results are as follows:
s409, the system operates in a working condition 10, regenerative braking energy is required to be utilized in a power supply interval, the energy feedback system is in a working state, the energy storage system is in a charging state, the value of the regenerative braking power exceeds the load requirement of the medium-voltage network or the low-voltage distribution network, the load requirement of the medium-voltage network or the low-voltage distribution network does not exceed the maximum feedback power of the energy feedback system, and the residual regenerative braking energy cannot be completely stored by the energy storage system after the feedback of the energy feedback system, so that the energy feedback system performs feedback according to the load requirement of the medium-voltage network or the low-voltage distribution network, the energy storage system performs charging according to the maximum charging power, the rest energy is consumed by a train braking resistor, the power required by the load of the medium-voltage network or the low-voltage distribution network is completely provided by the energy feedback system, and the reference power P of the energy feedback system is provided when the working condition 10 f_ref And energy storage system reference current I sc_ref The assignment results are as follows:
the power allocation is complete.
Step five, according to the reference power P of the energy feedback system f_ref And energy storage system reference current I sc_ref The power distribution result of (A) is respectively to the three-phase current (I) of the outgoing line end of the energy-feedback system fa ,I fb ,I fc ) And energy storage system current I sc And performing current inner loop closed-loop control, generating corresponding pulse waves, and controlling the grid-connected inverter and the energy storage converter in real time, as shown in a "current inner loop + pulse wave generation" module in fig. 3.
Claims (1)
1. The urban rail hybrid regenerative energy utilization system control method based on power distribution is characterized by comprising the following steps:
step one, collecting electric quantity in real time, comprising: DC bus voltage U dc Voltage of energy storage system U sc Current of energy storage system I sc Energy storage system state of charge SoC, energy feed system outlet terminal three-phase current I fa 、I fb 、I fc Three-phase voltage U for medium-voltage network or low-voltage distribution network load load_a 、U load_b 、U load_c And three-phase current I load_a 、I load_b 、I load_c (ii) a From U load_a 、U load_b 、U load_c And I load_a 、I load_b 、I load_c Calculating to obtain the total load power P of the medium-voltage network or the low-voltage distribution network load ；
Step two, setting a reference threshold value, comprising: traction threshold voltage U tr Braking threshold voltage U re Upper limit of state of charge SoC of energy storage system max Lower limit of state of charge SoC of energy storage system min Maximum discharge power P of energy storage system dis_m Maximum charging power P of energy storage system char_m Maximum feedback power P of energy feedback system fm And maximum value I of output current of braking voltage loop re_m (ii) a From P char_m 、P fm And I re_m And calculating to obtain the maximum value of the output current of the brake voltage ring distributed to the energy feedback system
Step three, the converter voltage outer loop control comprises the following steps: will U tr And U dc The difference value is modulated by a PI regulator to obtain the output current I of a traction voltage ring tr Will U is dc And U re The difference value is modulated by a PI regulator to obtain the output current I of the brake voltage ring re ；
Step four, distributing system power to obtain energy feedback system reference power P f_ref And energy storage system reference current I sc_ref ；
4.1 determining the system operation mode:
such as U dc >U re Skipping to the next step, otherwise, further judging U dc <U tr And SoC>SoC min If the system operation mode is the energy storage mode, if the system operation mode is not the idle mode, the system operation mode is the energy storage mode;
such as-I re <＝I f_re_m and-P re <＝P load The system operation mode is the first mode in the energy feedback mode, otherwise, the SoC is further judged>SoC max If the system operation mode is the mixed mode, if the system operation mode is not the second mode, the system operation mode is the second mode in the energy feedback mode;
wherein, P re Is I re In response to the power of the power source,
4.2 System Power is distributed according to System operation mode:
idle mode, system power allocation of
Energy storage mode, further judge I tr <P dis_m /U sc If true, the system power is allocated as
If not, the system power is distributed into
The energy feeding mode comprises:
a first mode in which system power is allocated to
Second mode, further judging-I re >I f_re_m And P is load >P fm If true, the system power is allocated as
If not, the system power is distributed as
Mixed mode:
such as-I re >I f_re_m And P is load >P fm If yes, calculating the residual current I after the output current of the brake voltage ring is distributed by the energy feedback system sc_re1 ＝I re +I f_re_m Further judgment of-I sc_re1 <P char_m /U sc If true, the system power is allocated as
If not, the system power is distributed as
Such as-I re >I f_re_m And P is load >P fm If the residual current is false, the residual current after the output current of the braking voltage ring is distributed by the energy feedback system is calculated
Further judgment of-I sc_re2 <P char_m /U sc If true, the system power is allocated as
If not, the system power is distributed as
Step five, according to P after system power distribution f_ref And I sc_ref Respectively to the three-phase current I of the leading-out terminal of the energy-feed system fa 、I fb 、I fc And energy storage system current I sc And carrying out current inner loop closed-loop control, and respectively generating pulse waves to control the grid-connected inverter and the energy storage converter in real time.
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