CN115946562B - Hybrid energy storage charging pile system and coordination control method - Google Patents
Hybrid energy storage charging pile system and coordination control method Download PDFInfo
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Abstract
The invention discloses a hybrid energy storage charging pile system and a cooperative control method, wherein the charging pile system comprises a current and voltage acquisition module, an intelligent charging pile control module, an alternating current slow charging system, a direct current fast charging system and a hybrid energy storage system; the intelligent charging pile control module is connected with the input alternating current power grid, monitors the load of the alternating current power grid in real time, and distributes alternating current electric energy to the alternating current slow charging system, the direct current fast charging system and the hybrid energy storage system according to real-time information provided by the current voltage acquisition module and feedback information of the alternating current slow charging system, the direct current fast charging system and the hybrid energy storage system. The charging pile system and the cooperative control method comprehensively solve the problems that a single energy storage technology cannot achieve high power density, high energy density, long service life, safety and the like, and simultaneously solve the short-time and quick charging requirement of the household user electric automobile due to the difficulty in capacity increase of the district power frequency transformer.
Description
Technical Field
The invention belongs to the technical field of charging pile systems, and particularly relates to a hybrid energy storage charging pile system and a coordination control method.
Background
In recent years, the development of new energy sources on a large scale is a trend, and users of electric automobiles are continuously increased, and the charging mode of charging piles and the demand for cell electric capacity are further improved, so that the two points become main guides of the current charging pile circuit design.
The charging scheme of the electric vehicle by the alternating current slow charging adopted by the current household charging pile is difficult in capacity increase of the district power frequency transformer, and cannot meet the short-time fast charging requirement of the electric vehicle.
At present, various energy storage technologies have different energy storage characteristics due to the differences of principles and processes. Electric energy storage is generally classified into energy-type energy storage and power-type energy storage. The energy type energy storage represented by lead-acid storage batteries, lithium batteries, sodium-sulfur batteries and the like has the advantages of high energy density and long energy storage time, but has low power density and short cycle life. The power type energy storage represented by super capacitor, flywheel energy storage, superconductive magnetic energy storage and the like has the advantages of high power density, high response speed and long cycle life, but has small energy density and high self-discharge rate. The single energy storage technology cannot meet the requirements of high power density, high energy density, long service life, safety and the like.
Disclosure of Invention
The invention aims to: in order to solve the problems in the prior art, the invention provides a hybrid energy storage charging pile system and a coordination control method.
The technical scheme is as follows: in order to achieve the aim of the invention, the invention adopts the following technical scheme:
the hybrid energy storage charging pile system is characterized by comprising a current and voltage acquisition module, an intelligent charging pile control module, an alternating current slow charging system, a direct current fast charging system and a hybrid energy storage system; the intelligent charging pile control module distributes alternating-current electric energy to the alternating-current slow charging system, the direct-current fast charging system and the hybrid energy storage system according to the real-time information provided by the current and voltage acquisition module and feedback information of the alternating-current slow charging system, the direct-current fast charging system and the hybrid energy storage system; the hybrid energy storage system can optimally allocate and store the direct current provided by the direct current quick charging system, and finally allocate the direct current to the direct current quick charging system.
As a preferred or specific embodiment:
the alternating-current slow charging system comprises a first contactor and an alternating-current slow charging module, wherein the first contactor performs coil attraction control through the intelligent charging pile control module to control alternating-current electric energy to enter the alternating-current slow charging module; the alternating-current slow charging module can charge an external battery, monitor the running state of the alternating-current slow charging module in real time and feed abnormal information back to the intelligent charging pile control module.
The direct-current quick-charging system comprises a second contactor, a third contactor, a rectifying module and a direct-current quick-charging module; the second contactor performs coil attraction control through the intelligent charging pile control module to control alternating current to enter the rectification module; the rectification module filters and rectifies the distributed alternating current to obtain direct current, and simultaneously provides the direct current for the direct current fast charging module and the hybrid energy storage system; the third contactor performs coil attraction control through the intelligent charging pile control module to control direct current to enter the direct current quick charging module; the direct current fast charging module can charge an external battery, monitor the running state of the direct current fast charging module in real time and feed abnormal information back to the intelligent charging pile control module.
The hybrid energy storage system comprises a fourth contactor, a hybrid energy storage coordination control system, a lithium battery, a super capacitor and a hybrid energy storage module; the fourth contactor performs coil attraction control through the intelligent charging pile control module, controls direct current provided by the direct current quick charging system to enter the hybrid energy storage coordination control system, and the hybrid energy storage coordination control system optimally distributes power of the super capacitor and the lithium battery, selects a load valley period of the alternating current power grid to charge the super capacitor and the lithium battery, prolongs service life of the lithium battery, improves utilization rate of the whole energy storage capacity, and reduces cost of the hybrid energy storage system; the hybrid energy storage module can distribute the electric energy of the super capacitor and the lithium battery to the direct current quick charging system, monitors the running state of the hybrid energy storage module in real time and feeds abnormal information back to the intelligent charging pile control module.
The invention also provides a coordination control method of the hybrid energy storage charging pile system, which comprises the following steps:
(1) In the operation control of the hybrid energy storage system, firstly, a high-frequency fluctuation component and a non-high-frequency fluctuation component of the power P of the hybrid energy storage system are distributed to super-capacitor energy storage and lithium battery energy storage through high-pass filtering control;
(2) Performing super-capacitor energy storage SOC adjustment based on the charging and discharging states of the lithium battery so as to optimize the overall adjustment capability;
(3) Adjusting power according to the SOC areas where the two energy storage areas are located and the charge and discharge states, and realizing overcharge and overdischarge protection coordination;
(4) And carrying out maximum charge-discharge power limitation matching of two types of energy storage with the aim of meeting the power instruction.
As a preferred or specific embodiment:
the whole regulating capability is optimized in the step (2), namely the discharging of the lithium battery is realizedPout_LB>0) When the energy storage electric quantity of the super capacitor is kept at a lower level, the discharge demand response of the hybrid energy storage system takes the lithium battery as a main component and the super capacitor as an auxiliary component, and the charge demand response of the hybrid energy storage system takes the super capacitor as a main component and the lithium battery as an auxiliary component; similarly, the lithium battery is chargedPout_ LB<0) When the method is used, the energy storage electric quantity of the super capacitor is kept at a higher level, the charging demand response of the hybrid energy storage system is mainly based on the lithium battery, the super capacitor is used as the auxiliary material, and the discharging demand response of the hybrid energy storage system is mainly based on the super capacitor and the lithium battery is used as the auxiliary material.
The overall adjustment capacity is optimized in the step (2), and the specific adjustment method comprises the following steps:
when (when)P out_LB >0. And is also provided withS SC >S LBd_SC At the time, judgeP out_SC Whether or not it is greater than 0, ifP out_SC >0, thenT f =T f +ΔT f The method comprises the steps of carrying out a first treatment on the surface of the If it isP out_SC <0, thenT f =T f –ΔT f The method comprises the steps of carrying out a first treatment on the surface of the Reassigning the high frequency fluctuating component and the non-high frequency fluctuating component until adjusted to the target area;
when (when)P out_LB <0. And is also provided withS SC <S LBc_SC At the time, judgeP out_SC Whether or not it is greater than 0, ifP out_SC >0, thenT f =T f –ΔT f The method comprises the steps of carrying out a first treatment on the surface of the If it isP out_SC <0, thenT f =T f +ΔT f The method comprises the steps of carrying out a first treatment on the surface of the Reassigning the high frequency fluctuating component and the non-high frequency fluctuating component until adjusted to the target area;
P out_SC power for hybrid energy storage systemsPFiltering to obtain the active power of which the high-frequency fluctuation component is distributed to the super capacitor for energy storage,P out_LB filtering to obtain non-high-frequency fluctuation components which are distributed to active power stored in the lithium battery,S SC storing energy for the current state of the super capacitor;T f for the filtering time constant, deltaT f Is thatA filter time constant adjustment coefficient;S LBd_SC 、S LBc_SC representing the control threshold value of the super capacitor energy storage SOC when the lithium battery is discharged and when the lithium battery is charged respectively.
The overcharge and overdischarge protection cooperation in the step (3) is realized by the following specific method:
when the energy storage system is in the overdischarge warning area, the output power is adjusted by adopting a formula shown in a formula (3.1), so that the state of charge is in a normal area; when the energy storage system is in an overcharge warning region, regulating the output power by adopting a formula shown in a formula (3.2) to enable the state of charge to be in a normal region;
S max_ESS 、S min_ESS Representing the upper and lower limits of the running range of the state of charge of the energy storage system respectively;S high_ESS 、S low_ESS respectively representing an overcharge and overdischarge warning threshold value of the charge state of the energy storage system; in the method, in the process of the invention,P out0_ESS 、P out_ESS respectively adjusting the output power values before and after the overcharge and overdischarge protection of the energy storage system;S ESS is the current state of charge of the energy storage system.
The maximum power limit protection cooperation in the step (3) comprises the following specific steps:
when the lithium battery and the super capacitor reach the charging power limit value or reach the discharging power limit value at the same time, modifying the power instruction of the hybrid energy storage system, and carrying out according to the maximum charging power or the maximum discharging power of the hybrid energy storage system; if the output power of the lithium battery or the super capacitor is over the limit, the lithium battery or the super capacitor is fixed at the limit value, and the over-limit part is shared by another energy storage; if the output power is within the maximum charge-discharge power limit range, no adjustment is performed.
The invention finally provides a control operation method of the hybrid energy storage charging pile system, which comprises the steps that a user selects alternating current slow charging and direct current fast charging by himself;
(1) If the alternating current slow charging is selected, if the power grid load is in a peak period, the first contactor is closed, the second contactor, the third contactor and the fourth contactor are opened, and the electric vehicle is subjected to alternating current slow charging;
(2) If the alternating current slow charge is selected: if the hybrid energy storage is insufficient in the low-load period of the power grid, the first contactor, the second contactor and the fourth contactor are closed, the third contactor is opened, and the electric vehicle is slowly charged in an alternating current manner and the hybrid energy storage system is charged;
(3) If the alternating current slow charge is selected: if the power grid load is in a valley period, the hybrid energy storage is sufficient, the first contactor is closed, the second contactor, the third contactor and the fourth contactor are opened, and the electric vehicle is slowly charged in an alternating current mode;
(4) If the direct current quick charge is selected, if the power grid load is in a peak period, the second contactor, the third contactor are closed, the first contactor and the fourth contactor are opened, and the electric vehicle is in direct current quick charge;
(5) If the direct current quick charge is selected, if the power grid load is in the valley period, the hybrid energy storage is insufficient, the second contactor, the third contactor and the fourth contactor are closed, the first contactor is opened, and the electric vehicle direct current quick charge and the hybrid energy storage system are charged;
(6) If the direct current quick charge is selected, if the power grid load is in the valley period, the hybrid energy storage is sufficient, the second contactor and the third contactor are closed, the first contactor and the fourth contactor are opened, and the direct current quick charge of the electric vehicle is realized;
(7) When the electric automobile is not charged, the hybrid energy storage is sufficient, and the first contactor, the second contactor, the third contactor and the fourth contactor are all disconnected;
(8) When the electric automobile is not charged, the hybrid energy storage is insufficient, the second contactor and the fourth contactor are closed, the first contactor and the third contactor are opened, and the hybrid energy storage is charged.
The beneficial effects are that: compared with the prior art, the invention selects different charging modes through the control system, and is applicable to different charging demands of users. The hybrid energy storage module is used for realizing the quick charge of the electric vehicle, solving the problems of difficult capacity increase and short-time quick charge of the district power frequency transformer and relieving the power grid load in the electricity utilization peak period. Meanwhile, a hybrid energy storage coordination control system is provided, so that the load of the lithium battery and the load of the super capacitor are allocated in real time, the overall performance of the hybrid energy storage system is improved, and the service life of the energy storage system is prolonged. The lithium battery is used for storing energy, so that the advantages of high energy density and long energy storage time are realized; the super capacitor stores energy, so that the advantages of high power density, high response speed and long cycle life are realized. The problems that a single energy storage technology cannot achieve high power density, high energy density, long service life, safety and the like are comprehensively solved.
Drawings
Fig. 1 is a block diagram of a charging pile system according to the present invention.
FIG. 2 is a flow chart of the hybrid energy storage coordination control system of the present invention.
FIG. 3 is a schematic diagram of the coordinated control of the present invention to optimize the overall tuning capability.
Fig. 4 is a load state diagram of the energy storage system of the present invention.
FIG. 5 is an overall control flow diagram of a hybrid energy storage system coordinated control strategy of the present invention.
Fig. 6 is a control operation diagram of the charging pile system according to the present invention.
Description of the embodiments
The invention will be better understood from the following examples. However, it will be readily appreciated by those skilled in the art that the description of the embodiments is provided for illustration only and should not limit the invention as described in detail in the claims. The implementation conditions adopted in the embodiments can be further adjusted according to different requirements of specific use, and the implementation conditions which are not noted are conventional conditions in the industry. The technical features of the respective embodiments of the present invention may be combined with each other as long as they do not collide with each other.
Examples
A household hybrid energy storage charging pile system is shown in fig. 1, and comprises a current and voltage acquisition module, an intelligent charging pile control module, an alternating current slow charging system, a direct current fast charging system and a hybrid energy storage system, wherein the system comprises the following specific components:
the current and voltage acquisition module is connected with an input alternating current power grid, monitors the load of the alternating current power grid in real time, and disconnects the alternating current power grid if the load of the alternating current power grid exceeds the rated load.
The intelligent charging pile control module distributes alternating current electric energy to the alternating current slow charging system, the direct current fast charging system and the hybrid energy storage system according to the real-time information provided by the current and voltage acquisition module and feedback information of the alternating current slow charging system, the direct current fast charging system and the hybrid energy storage system; the hybrid energy storage system can optimally allocate and store the direct current provided by the direct current quick charging system, and finally allocate the direct current to the direct current quick charging system.
The alternating-current slow charging system comprises a first contactor and an alternating-current slow charging module, and if alternating-current slow charging is selected, alternating-current electric energy is distributed to the alternating-current slow charging system; the first contactor performs coil attraction control through the intelligent charging pile control module to control alternating current electric energy to enter the alternating current slow charging module; the alternating-current slow charging module can charge an external battery, monitor the running state of the alternating-current slow charging module in real time and feed abnormal information back to the intelligent charging pile control module.
The direct-current quick-charging system comprises a second contactor, a third contactor, a rectifying module and a direct-current quick-charging module; the second contactor performs coil attraction control through the intelligent charging pile control module to control alternating current to enter the rectification module; the rectification module filters and rectifies the distributed alternating current to obtain direct current, and simultaneously provides the direct current for the direct current fast charging module and the hybrid energy storage coordination control system in the hybrid energy storage system; the third contactor performs coil attraction control through the intelligent charging pile control module to control direct current to enter the direct current quick charging module; the direct current fast charging module can charge an external battery, monitor the running state of the direct current fast charging module in real time and feed abnormal information back to the intelligent charging pile control module.
The hybrid energy storage system comprises a fourth contactor, a hybrid energy storage coordination control system, a lithium battery, a super capacitor and a hybrid energy storage module; the fourth contactor performs coil attraction control through the intelligent charging pile control module, direct current provided by the control flow module enters the hybrid energy storage coordination control system, the hybrid energy storage coordination control system optimally distributes power of the super capacitor and the lithium battery, the super capacitor and the lithium battery are charged in a low load period of the alternating current power grid, the service life of the lithium battery is prolonged, the utilization rate of the whole energy storage capacity is improved, and the cost of the hybrid energy storage system is reduced; the hybrid energy storage module can distribute the electric energy of the super capacitor and the lithium battery to a direct current quick charging module in a direct current quick charging system, monitors the running state of the hybrid energy storage module in real time and feeds abnormal information back to the intelligent charging pile control module.
In the hybrid energy storage charging pile system, the intelligent charging pile control module selects a megacore KX-6640MA processor. The rectifying module rectifies alternating current input into direct current output by adopting a bridge rectifying circuit, and outputs the direct current output through DC-DC full-bridge power conversion. The current and voltage acquisition module adopts an LM358 differential operational amplifier, a voltage dividing circuit formed by voltage dividing resistors is used for sampling, the input voltage is 15 times of the output voltage, the voltage dividing resistors adopt precision resistors, the flowing current is calculated according to the sampled voltage value, the current is converted into digital quantity through A/D (analog-to-digital) of a controller, and then average filtering processing is carried out, so that the sampling of the current value is realized. The alternating-current slow charging module, the direct-current fast charging module and the hybrid energy storage module are all used for monitoring the running state of each charging module by using a PF6000 power monitor.
The coordination control method of the hybrid energy storage charging pile system, as shown in fig. 2, comprises the following steps:
(1) In the operation control of the hybrid energy storage system, firstly, a high-frequency fluctuation component and a non-high-frequency fluctuation component of the power P of the hybrid energy storage system are distributed to super-capacitor energy storage and lithium battery energy storage through high-pass filtering control;
(2) Then, based on the charge and discharge states of the lithium battery, the super-capacitor energy storage SOC is adjusted so as to optimize the overall adjustment capability;
(3) Adjusting power according to the SOC areas where the two energy storage areas are located and the charge and discharge states, and realizing overcharge and overdischarge protection cooperation;
(4) And finally, carrying out maximum charge-discharge power limitation matching of the two types of energy storage with the aim of meeting the power instruction.
Further, the specific method is as follows.
Optimizing overall regulation:
discharging in lithium batteryP out_LB >0) When the super capacitor energy storage capacity is kept at a low level, namely the target area [ shown in (a) of FIG. 3 ]S min_SC, S LBd_SC ]The discharging demand response of the hybrid energy storage system takes a lithium battery as a main component, and the super capacitor as an auxiliary component, and the charging demand response of the hybrid energy storage system takes the super capacitor as a main component and the lithium battery as an auxiliary component; similarly, the lithium battery is chargedP out_LB <0) When the super capacitor energy storage capacity is kept at a higher level, namely, the target area [ shown in (b) of FIG. 3 ]S LBc_SC, S max_SC ]The charging demand response to the hybrid energy storage system is mainly based on a lithium battery and the super capacitor is used as an auxiliary material, and the discharging demand response to the hybrid energy storage system is mainly based on the super capacitor and the lithium battery is used as an auxiliary material.
S max_SC 、S min_SC Respectively representing the upper limit and the lower limit of the super capacitor energy storage SOC;S LBd_SC 、S LBc_SC representing the control threshold value of the super capacitor energy storage SOC when the lithium battery is discharged and when the lithium battery is charged respectively.
When (when)P out_LB >0. And is also provided withS SC >S LBd_SC At the time, judgeP out_SC Whether or not it is greater than 0, ifP out_SC >0, thenT f =T f +ΔT f The method comprises the steps of carrying out a first treatment on the surface of the If it isP out_SC <0, thenT f =T f –ΔT f The method comprises the steps of carrying out a first treatment on the surface of the Reassigning the high frequency fluctuating component and the non-high frequency fluctuating component until adjusted to the target area;
when (when)P out_LB <0. And is also provided withS SC <S LBc_SC At the time, judgeP out_SC Whether or not it is greater than 0, ifP out_SC >0, thenT f =T f –ΔT f The method comprises the steps of carrying out a first treatment on the surface of the If it isP out_SC <0, thenT f =T f +ΔT f The method comprises the steps of carrying out a first treatment on the surface of the Reassigning the high frequency fluctuating component and the non-high frequency fluctuating component until adjusted to the target area;
P out_SC power for hybrid energy storage systemsPFiltering to obtain the active power of which the high-frequency fluctuation component is distributed to the super capacitor for energy storage,P out_LB filtering to obtain non-high-frequency fluctuation components which are distributed to active power stored in the lithium battery,S SC storing energy for the current state of the super capacitor;T f for the filtering time constant, deltaT f Is thatThe filter time constant adjusts the coefficients.
Overcharge and overdischarge protection cooperation:
as shown in fig. 4, when the energy storage system is in the overdischarge warning region, the formula shown in the formula (3.1) is adopted to adjust the output power, so that the state of charge is in the normal region; when the energy storage system is in the over-charge warning area, the output power is regulated by adopting a formula shown in the formula (3.2), so that the state of charge is in a normal area.
S max_ESS 、S min_ESS Representing the upper and lower limits of the running range of the state of charge of the energy storage system respectively;S high_ESS 、S low_ESS respectively representing an overcharge and overdischarge warning threshold value of the charge state of the energy storage system; in the method, in the process of the invention,P out0_ESS 、P out_ESS respectively adjusting the output power values before and after the overcharge and overdischarge protection of the energy storage system;S ESS is the current state of charge of the energy storage system.
Maximum power limit protection coordination:
when the lithium battery energy storage system and the super capacitor energy storage system reach the charging power limit value or reach the discharging power limit value at the same time, modifying the power instruction of the hybrid energy storage system, and carrying out according to the maximum charging power or the maximum discharging power of the hybrid energy storage system. If the output power of the lithium battery or the super capacitor is over the limit, the lithium battery or the super capacitor is fixed at the limit value, and the over-limit part is shared by another energy storage; if the output power is within the maximum charge-discharge power limit range, no adjustment is performed.
In summary, an overall control flow chart of the hybrid energy storage system coordination control strategy of the present invention is shown in fig. 5.
The control operation method of the hybrid energy storage charging pile system is shown in fig. 6, and comprises the steps that a user selects alternating current slow charging and direct current fast charging by himself;
(1) If the alternating current slow charging is selected, if the power grid load is in a peak period, the first contactor is closed, the second contactor, the third contactor and the fourth contactor are opened, and the electric vehicle is subjected to alternating current slow charging;
(2) If the alternating current slow charge is selected: if the hybrid energy storage is insufficient in the low-load period of the power grid, the first contactor, the second contactor and the fourth contactor are closed, the third contactor is opened, and the electric vehicle is slowly charged in an alternating current manner and the hybrid energy storage system is charged;
(3) If the alternating current slow charge is selected: if the power grid load is in a valley period, the hybrid energy storage is sufficient, the first contactor is closed, the second contactor, the third contactor and the fourth contactor are opened, and the electric vehicle is slowly charged in an alternating current mode;
(4) If the direct current quick charge is selected, if the power grid load is in a peak period, the second contactor, the third contactor are closed, the first contactor and the fourth contactor are opened, and the electric vehicle is in direct current quick charge;
(5) If the direct current quick charge is selected, if the power grid load is in the valley period, the hybrid energy storage is insufficient, the second contactor, the third contactor and the fourth contactor are closed, the first contactor is opened, and the electric vehicle direct current quick charge and the hybrid energy storage system are charged;
(6) If the direct current quick charge is selected, if the power grid load is in the valley period, the hybrid energy storage is sufficient, the second contactor and the third contactor are closed, the first contactor and the fourth contactor are opened, and the direct current quick charge of the electric vehicle is realized;
(7) When the electric automobile is not charged, the hybrid energy storage is sufficient, and the first contactor, the second contactor, the third contactor and the fourth contactor are all disconnected;
(8) When the electric automobile is not charged, the hybrid energy storage is insufficient, the second contactor and the fourth contactor are closed, the first contactor and the third contactor are opened, and the hybrid energy storage is charged.
The present invention provides a method and a thought, and a method for realizing the technical scheme are numerous, 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 improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention. The components not explicitly described in this embodiment can be implemented by using the prior art.
Claims (12)
1. The coordination control method of the hybrid energy storage charging pile system comprises a current and voltage acquisition module, an intelligent charging pile control module, an alternating current slow charging system, a direct current fast charging system and a hybrid energy storage system; the intelligent charging pile control module distributes alternating current electric energy to the alternating current slow charging system, the direct current fast charging system and the hybrid energy storage system according to the real-time information provided by the current and voltage acquisition module and feedback information of the alternating current slow charging system, the direct current fast charging system and the hybrid energy storage system; the hybrid energy storage system can optimally allocate and store the direct current provided by the direct current quick charging system and finally allocate the direct current to the direct current quick charging system, and is characterized in that the coordination control method comprises the following steps:
(1) In the operation control of the hybrid energy storage system, firstly, a high-frequency fluctuation component and a non-high-frequency fluctuation component of the power P of the hybrid energy storage system are distributed to super-capacitor energy storage and lithium battery energy storage through high-pass filtering control;
(2) Performing super-capacitor energy storage SOC adjustment based on the charging and discharging states of the lithium battery so as to optimize the overall adjustment capability;
(3) Adjusting power according to the SOC areas where the two energy storage areas are located and the charge and discharge states, and realizing overcharge and overdischarge protection coordination;
(4) And carrying out maximum charge-discharge power limitation matching of two types of energy storage with the aim of meeting the power instruction.
2. The coordinated control method of a hybrid energy storage charging pile system according to claim 1, wherein the optimizing the overall adjustment capability in step (2) is in lithium battery dischargeP out_LB >When 0, the energy storage electric quantity of the super capacitor is kept at a lower level, the discharge demand response of the hybrid energy storage system takes the lithium battery as a main component and the super capacitor as an auxiliary component, and the charge demand response of the hybrid energy storage system takes the super capacitor as a main component and the lithium battery as an auxiliary component; similarly, charging in lithium batteryP out_LB <0. When the method is used, the energy storage electric quantity of the super capacitor is kept at a higher level, the charging demand response of the hybrid energy storage system is mainly based on the lithium battery, the super capacitor is used as the auxiliary material, and the discharging demand response of the hybrid energy storage system is mainly based on the super capacitor and the lithium battery is used as the auxiliary material.
3. The method for coordinated control of a hybrid energy storage charging pile system according to claim 1, wherein the optimizing the overall adjustment capability in step (2) comprises the following steps:
when (when)P out_LB >0. And is also provided withS SC >S LBd_SC At the time, judgeP out_SC Whether or not it is greater than 0, ifP out_SC >0, thenT f =T f +ΔT f The method comprises the steps of carrying out a first treatment on the surface of the If it isP out_SC <0, thenT f =T f –ΔT f The method comprises the steps of carrying out a first treatment on the surface of the Reassigning the high frequency fluctuating component and the non-high frequency fluctuating component until adjusted to the target area;
when (when)P out_LB <0. And is also provided withS SC <S LBc_SC At the time, judgeP out_SC Whether or not it is greater than 0, ifP out_SC >0, thenT f =T f –ΔT f The method comprises the steps of carrying out a first treatment on the surface of the If it isP out_SC <0, thenT f =T f +ΔT f The method comprises the steps of carrying out a first treatment on the surface of the Reassigning the high frequency fluctuating component and the non-high frequency fluctuating component until adjusted to the target area;
P out_SC power for hybrid energy storage systemsPFiltering to obtain the active power of which the high-frequency fluctuation component is distributed to the super capacitor for energy storage,P out_LB filtering to obtain non-high-frequency fluctuation components which are distributed to active power stored in the lithium battery,S SC storing energy for the current state of the super capacitor;T f for the filtering time constant, deltaT f Is thatA filter time constant adjustment coefficient;S LBd_SC 、S LBc_SC representing the control threshold value of the super capacitor energy storage SOC when the lithium battery is discharged and when the lithium battery is charged respectively.
4. The coordination control method of a hybrid energy storage charging pile system according to claim 1, wherein the overcharge and overdischarge protection in the step (3) are matched, and the specific method comprises the following steps:
when the energy storage system is in the overdischarge warning area, the output power is adjusted by adopting a formula shown in a formula (3.1), so that the state of charge is in a normal area; when the energy storage system is in an overcharge warning region, regulating the output power by adopting a formula shown in a formula (3.2) to enable the state of charge to be in a normal region;
S max_ESS 、S min_ESS Representing the upper and lower limits of the running range of the state of charge of the energy storage system respectively;S high_ESS 、S low_ESS respectively representing an overcharge and overdischarge warning threshold value of the charge state of the energy storage system; in the method, in the process of the invention,P out0_ESS 、P out_ESS respectively adjusting the output power values before and after the overcharge and overdischarge protection of the energy storage system;S ESS is the current state of charge of the energy storage system.
5. The coordination control method of a hybrid energy storage charging pile system according to claim 1, wherein the maximum charge and discharge power limit in the step (4) is matched, and the specific method comprises the following steps:
when the lithium battery and the super capacitor reach the charging power limit value or reach the discharging power limit value at the same time, modifying the power instruction of the hybrid energy storage system, and carrying out according to the maximum charging power or the maximum discharging power of the hybrid energy storage system; if the output power of the lithium battery or the super capacitor is over the limit, the lithium battery or the super capacitor is fixed at the limit value, and the over-limit part is shared by another energy storage; if the output power is within the maximum charge-discharge power limit range, no adjustment is performed.
6. The coordination control method of a hybrid energy storage charging pile system according to claim 1, wherein the alternating current slow charging system comprises a first contactor and an alternating current slow charging module, the first contactor performs coil attraction control through an intelligent charging pile control module, and alternating current energy is controlled to enter the alternating current slow charging module; the alternating-current slow charging module can charge an external battery, monitor the running state of the alternating-current slow charging module in real time and feed abnormal information back to the intelligent charging pile control module.
7. The coordination control method of a hybrid energy storage charging pile system according to claim 1, wherein the direct current rapid charging system comprises a second contactor, a third contactor, a rectifying module and a direct current rapid charging module; the second contactor performs coil attraction control through the intelligent charging pile control module to control alternating current to enter the rectification module; the rectification module filters and rectifies the distributed alternating current to obtain direct current, and simultaneously provides the direct current for the direct current fast charging module and the hybrid energy storage system; the third contactor performs coil attraction control through the intelligent charging pile control module to control direct current to enter the direct current quick charging module; the direct current fast charging module can charge an external battery, monitor the running state of the direct current fast charging module in real time and feed abnormal information back to the intelligent charging pile control module.
8. The coordinated control method of a hybrid energy storage charging pile system according to claim 1, wherein the hybrid energy storage system comprises a fourth contactor, a hybrid energy storage coordinated control system, a lithium battery, a super capacitor and a hybrid energy storage module; the fourth contactor performs coil attraction control through the intelligent charging pile control module, controls direct current provided by the direct current quick charging system to enter the hybrid energy storage coordination control system, and the hybrid energy storage coordination control system optimally distributes power of the super capacitor and the lithium battery, and selects a load valley period of the alternating current power grid to charge the super capacitor and the lithium battery; the hybrid energy storage module can distribute the electric energy of the super capacitor and the lithium battery to the direct current quick charging system, monitors the running state of the hybrid energy storage module in real time and feeds abnormal information back to the intelligent charging pile control module.
9. The control operation method of the hybrid energy storage charging pile system comprises a current and voltage acquisition module, an intelligent charging pile control module, an alternating current slow charging system, a direct current fast charging system and a hybrid energy storage system; the intelligent charging pile control module distributes alternating current electric energy to the alternating current slow charging system, the direct current fast charging system and the hybrid energy storage system according to the real-time information provided by the current and voltage acquisition module and feedback information of the alternating current slow charging system, the direct current fast charging system and the hybrid energy storage system; the hybrid energy storage system can optimally allocate and store the direct current provided by the direct current quick charging system and finally allocate the direct current to the direct current quick charging system, and is characterized in that the control operation method comprises the steps that a user selects alternating current slow charging and direct current quick charging by himself;
(1) If the alternating current slow charging is selected, if the power grid load is in a peak period, the first contactor is closed, the second contactor, the third contactor and the fourth contactor are opened, and the electric vehicle is subjected to alternating current slow charging;
(2) If the alternating current slow charge is selected: if the hybrid energy storage is insufficient in the low-load period of the power grid, the first contactor, the second contactor and the fourth contactor are closed, the third contactor is opened, and the electric vehicle is slowly charged in an alternating current manner and the hybrid energy storage system is charged;
(3) If the alternating current slow charge is selected: if the power grid load is in a valley period, the hybrid energy storage is sufficient, the first contactor is closed, the second contactor, the third contactor and the fourth contactor are opened, and the electric vehicle is slowly charged in an alternating current mode;
(4) If the direct current quick charge is selected, if the power grid load is in a peak period, the second contactor, the third contactor are closed, the first contactor and the fourth contactor are opened, and the electric vehicle is in direct current quick charge;
(5) If the direct current quick charge is selected, if the power grid load is in the valley period, the hybrid energy storage is insufficient, the second contactor, the third contactor and the fourth contactor are closed, the first contactor is opened, and the electric vehicle direct current quick charge and the hybrid energy storage system are charged;
(6) If the direct current quick charge is selected, if the power grid load is in the valley period, the hybrid energy storage is sufficient, the second contactor and the third contactor are closed, the first contactor and the fourth contactor are opened, and the direct current quick charge of the electric vehicle is realized;
(7) When the electric automobile is not charged, the hybrid energy storage is sufficient, and the first contactor, the second contactor, the third contactor and the fourth contactor are all disconnected;
(8) When the electric automobile is not charged, the hybrid energy storage is insufficient, the second contactor and the fourth contactor are closed, the first contactor and the third contactor are opened, and the hybrid energy storage is charged.
10. The control operation method of the hybrid energy storage charging pile system according to claim 9, wherein the alternating current slow charging system comprises a first contactor and an alternating current slow charging module, the first contactor performs coil attraction control through the intelligent charging pile control module, and alternating current energy is controlled to enter the alternating current slow charging module; the alternating-current slow charging module can charge an external battery, monitor the running state of the alternating-current slow charging module in real time and feed abnormal information back to the intelligent charging pile control module.
11. The method for controlling and operating a hybrid energy storage charging pile system according to claim 9, wherein the dc fast charging system comprises a second contactor, a third contactor, a rectifying module and a dc fast charging module; the second contactor performs coil attraction control through the intelligent charging pile control module to control alternating current to enter the rectification module; the rectification module filters and rectifies the distributed alternating current to obtain direct current, and simultaneously provides the direct current for the direct current fast charging module and the hybrid energy storage system; the third contactor performs coil attraction control through the intelligent charging pile control module to control direct current to enter the direct current quick charging module; the direct current fast charging module can charge an external battery, monitor the running state of the direct current fast charging module in real time and feed abnormal information back to the intelligent charging pile control module.
12. The method of claim 9, wherein the hybrid energy storage system comprises a fourth contactor, a hybrid energy storage coordination control system, a lithium battery, a super capacitor, and a hybrid energy storage module; the fourth contactor performs coil attraction control through the intelligent charging pile control module, controls direct current provided by the direct current quick charging system to enter the hybrid energy storage coordination control system, and the hybrid energy storage coordination control system optimally distributes power of the super capacitor and the lithium battery, and selects a load valley period of the alternating current power grid to charge the super capacitor and the lithium battery; the hybrid energy storage module can distribute the electric energy of the super capacitor and the lithium battery to the direct current quick charging system, monitors the running state of the hybrid energy storage module in real time and feeds abnormal information back to the intelligent charging pile control module.
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