CN110932376B - Energy management strategy of hybrid energy storage system - Google Patents
Energy management strategy of hybrid energy storage system Download PDFInfo
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- CN110932376B CN110932376B CN201911015880.9A CN201911015880A CN110932376B CN 110932376 B CN110932376 B CN 110932376B CN 201911015880 A CN201911015880 A CN 201911015880A CN 110932376 B CN110932376 B CN 110932376B
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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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- 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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
Abstract
The invention belongs to the field of hybrid energy storage, and particularly relates to an energy management strategy of a hybrid energy storage system, which comprises a storage battery, a super capacitor, a first bidirectional DC/DC converter and a second bidirectional DC/DC converter, wherein the first bidirectional DC/DC converter is used for controlling charging and discharging of the storage battery, the second bidirectional DC/DC converter is used for controlling charging and discharging of the super capacitor, and the energy management strategy comprises a control strategy of the first bidirectional DC/DC converter and a control strategy of the second bidirectional DC/DC converter. According to the energy management strategy of the hybrid energy storage system, on one hand, the storage battery is controlled to realize charging and discharging, and meanwhile, the storage battery is subjected to overshoot and over-discharge protection, so that the service life of the storage battery is prolonged; on the other hand, when the super capacitor is controlled, the super capacitor is protected against voltage, so that the service life of the whole hybrid energy storage system is prolonged.
Description
Technical Field
The invention belongs to the field of hybrid energy storage, and particularly relates to an energy management strategy of a hybrid energy storage system.
Background
The energy management strategy of hybrid energy storage is always a key and difficult point in an energy storage system, an energy storage element generally comprises an energy type element such as a storage battery and a power type element such as a super capacitor, the energy storage element realizes efficient charging and discharging, the service life of the energy storage element is prolonged, and the problem of urgent final conclusion in hybrid energy storage research is always solved. Related art documents, such as patent document CN109193891A, disclose an improved hybrid energy storage system power allocation method for extending the life of PMSG batteries, the method comprising: calculating the storage power of the hybrid energy storage system; distributing between the battery and the capacitor according to the calculated storage power of the hybrid energy storage system, and setting the rated voltage of the direct-current bus as the optimal control voltage of the capacitor; determining whether the hybrid energy storage system is in a charging or discharging state according to whether the voltage of the direct-current bus is higher than a rated value or lower than the rated value; the power allocation value does not need to be determined by any optimization algorithm, and the response time is reduced. And the optimal control voltage (OSCV) of the capacitor in the hybrid energy storage system is considered, and the hybrid energy storage system is preferentially enabled to reach the optimal control voltage of the capacitor. The technical scheme has insufficient protection for the overshoot and the over-discharge of the energy storage element, and the voltage-resistant protection of the energy storage element is not considered.
In view of the above technical problems, improvements are needed.
Disclosure of Invention
Based on the above-mentioned deficiencies in the prior art, the present invention provides a hybrid energy storage system energy management strategy.
In order to achieve the purpose, the invention adopts the following technical scheme:
a hybrid energy storage system energy management strategy, the hybrid energy storage system comprising a storage battery, a super capacitor, a first bidirectional DC/DC converter, a second bidirectional DC/DC converter, the first bidirectional DC/DC converter being used for controlling charging and discharging of the storage battery, the second bidirectional DC/DC converter being used for controlling charging and discharging of the super capacitor, the energy management strategy comprising a control strategy for the first bidirectional DC/DC converter and a control strategy for the second bidirectional DC/DC converter as follows:
control strategy of the first bidirectional DC/DC converter:
acquiring power Px distributed to a storage battery, a voltage value Ux of the storage battery and a current value Ix of the storage battery; calculating a ratio of the power Px of the storage battery to the voltage value Ux of the storage battery to obtain a current reference value I1, calculating a difference value between the current reference value I1 and the current value Ix of the storage battery, and inputting the difference value into a first PI controller to obtain a voltage control signal, wherein the voltage control signal forms a first charge and discharge control signal of a first bidirectional DC/DC converter through a first PWM unit;
control strategy of the second bidirectional DC/DC converter:
acquiring power Pc distributed to a super capacitor, a set voltage Uc of the super capacitor, a terminal voltage Usc of the super capacitor and a current value Ic of the super capacitor; performing difference on the set voltage Uc of the super capacitor and the terminal voltage Usc of the super capacitor and inputting the difference into a second PI controller; the power Pc of the super capacitor and the terminal voltage Usc of the super capacitor are subjected to ratio calculation to obtain a current reference value I2, the difference value between the current reference value I2 and the current value Ic of the super capacitor is calculated, the difference value is input into a third PI controller, voltage control signals of a voltage outer ring and a current inner ring are obtained by superposition of the second PI controller and the third PI controller, and the voltage control signals of the voltage outer ring and the current inner ring form a second charging and discharging control signal of a second bidirectional DC/DC converter through a second PWM unit.
As a preferred scheme, the control strategy of the first bidirectional DC/DC converter further includes a state of charge protection module of the storage battery, the state of charge protection module of the storage battery is configured to send a third charge and discharge control signal to the first bidirectional DC/DC converter according to the state of charge of the storage battery, the charge signal and the discharge signal in the third charge and discharge control signal and the first charge and discharge control signal are respectively merged and input to an and gate unit to obtain an output signal to control charge and discharge of the first bidirectional DC/DC converter, and the third charge and discharge control signal is generated in the following manner:
acquiring the real-time SOC, the minimum SOC SOCmin and the maximum SOC SOCmax of the storage battery, and judging:
(1) when the SOC is less than SOCmin, outputting a charge allowing signal and not outputting a discharge allowing signal;
(2) outputting a charge enable signal and a discharge enable signal when SOCmin < SOC < SOCmax;
(3) when SOCmax < SOC, a charge disallowance signal is output, and a discharge allow signal is output.
As a preferable scheme, the control strategy of the second bidirectional DC/DC converter further includes a withstand voltage protection module of a super capacitor, the withstand voltage protection module of the super capacitor is configured to send a fourth charge and discharge control signal to the second bidirectional DC/DC converter according to a terminal voltage state of the super capacitor, charge signals and discharge signals in the fourth charge and discharge control signal and the second charge and discharge control signal are respectively merged and input to an and gate unit to obtain output signals to control charge and discharge of the second bidirectional DC/DC converter, and the fourth charge and discharge control signal is generated in the following manner:
acquiring a terminal voltage Usc, a minimum terminal voltage Usicmin and a maximum terminal voltage Usicmax of the super capacitor, and judging:
(1) when Usc < Usicmin, outputting a charging permission signal and not outputting a discharging permission signal;
(2) when Usicmin < Usc < Usicmax, outputting a charging permission signal and a discharging permission signal;
(3) when Ucmc < Usc, a charge disallowance signal is output, and a discharge allow signal is output.
As a preferable scheme, the control strategy of the first bidirectional DC/DC converter further includes a first amplitude limiting module, the first amplitude limiting module is configured to send a fifth charge and discharge control signal to the second bidirectional DC/DC converter according to a current state of the storage battery, the fifth charge and discharge control signal and the first charge and discharge control signal, and a charge signal and a discharge signal in the third charge and discharge control signal are respectively merged and input to the and gate unit to obtain an output signal to control charge and discharge of the first bidirectional DC/DC converter, and the fifth charge and discharge control signal is generated in the following manner:
inputting the current reference value I1 and the current value Ix of the storage battery into a comparator, and obtaining a comparison result and outputting the comparison result through the matching of a NOT gate unit:
(1) if the current value Ix of the storage battery is less than the current reference value I1, outputting a charging permission signal and not outputting a discharging permission signal;
(2) and if the current value Ix of the storage battery is larger than the current reference value I1, outputting a charge disallowing signal and a discharge allowing signal.
As a preferable scheme, the control strategy of the second bidirectional DC/DC converter further includes a second amplitude limiting module, the second amplitude limiting module is configured to send a sixth charge and discharge control signal to the second bidirectional DC/DC converter according to a current state of the super capacitor, the sixth charge and discharge control signal and the first charge and discharge control signal, and a charge signal and a discharge signal in the third charge and discharge control signal are respectively merged and input to the and gate unit to obtain an output signal to control charge and discharge of the first bidirectional DC/DC converter, and the sixth charge and discharge control signal is generated in the following manner:
inputting the current reference value I2 and the current value Ic of the super capacitor into a comparator, and obtaining a comparison result and outputting the comparison result through the cooperation of a NOT gate unit:
(1) if the current value Ic of the super capacitor is less than the current reference value I2, outputting a charging permission signal and a discharging non-permission signal;
(2) if the current value Ic of the super capacitor is larger than the current reference value I2, the charge disallowing signal and the discharge allowing signal are output.
Preferably, the first bidirectional DC/DC converter includes an inductor L1, a switching tube S1, and a switching tube S2, and the second bidirectional DC/DC converter includes an inductor L2, a switching tube S3, and a switching tube S4.
Compared with the prior art, the invention has the beneficial effects that: according to the energy management strategy of the hybrid energy storage system, on one hand, the storage battery is controlled to realize charging and discharging, and meanwhile, the storage battery is subjected to overshoot and over-discharge protection, so that the service life of the storage battery is prolonged; on the other hand, when the super capacitor is controlled, the super capacitor is protected against voltage, so that the service life of the whole hybrid energy storage system is prolonged.
Drawings
Fig. 1 is a schematic structural diagram of a hybrid energy storage system according to a first embodiment of an energy management strategy of the hybrid energy storage system of the present invention;
FIG. 2 is a schematic diagram illustrating a battery charging/discharging control strategy according to a first embodiment of an energy management strategy of a hybrid energy storage system of the present invention;
fig. 3 is a schematic diagram of a charging and discharging control strategy of a super capacitor according to a first embodiment of an energy management strategy of a hybrid energy storage system of the present invention; wherein: A. a storage battery; B. a super capacitor; C. a state of charge protection module; D. a voltage withstand protection module; and, and gate unit; not, not gate cell; PI controller; DC/DC. bidirectional DC/DC converter; a PWM unit; s1, S2, S3 and S4. switching tubes; l1, L2. inductance; px. power of the battery; ux. voltage value of the battery; ix. current value of the battery; i1, I2. current reference value; pc. power of the super capacitor; uc. set voltage of super capacitor; usc, terminal voltage of the supercapacitor; ic. current value of the super capacitor; the total output voltage of the hybrid energy storage system is U total; q1, Q3. charge signal inputs; q2, Q4.
Detailed Description
In order to more clearly illustrate the present invention, embodiments of the present invention will be described below with reference to the accompanying drawings. It is obvious that the drawings in the following description are only examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
The first embodiment is as follows:
as shown in fig. 1-3, the energy management strategy of the hybrid energy storage system according to the present invention is designed for charge and discharge management in the hybrid energy storage system, and includes a hybrid energy storage system, wherein the energy storage element is mainly an energy type element storage battery a and a power type element super capacitor B, which are connected to output a total output voltage ucotal of the hybrid energy storage system. The inductor L1, the switch tube S1 and the switch tube S2 form a bidirectional DC/DC1 converter which is connected with the storage battery A to control charging and discharging of the storage battery A; the inductor L2, the switch tube S3 and the switch tube S4 form a bidirectional DC/DC2 converter which is connected with the super capacitor B to control charging and discharging of the super capacitor B, and the energy management strategy comprises a control strategy for the first bidirectional DC/DC converter and a control strategy for the second bidirectional DC/DC converter.
Specifically, the first bidirectional DC/DC converter comprises a ratio calculation unit, a difference calculation unit, a first PI controller, a PWM unit, a comparator, an AND gate unit NOT, two AND gate units AND, AND a state-of-charge protection module C; the charging signal AND the discharging signal in the first charging AND discharging control signal, the third charging AND discharging control signal AND the fifth charging AND discharging control signal are respectively merged AND input into an AND gate unit AND to obtain an output signal to control the charging AND discharging of the first bidirectional DC/DC converter, wherein the first control signal generation mode is as follows:
the ratio of the distributed storage battery power Px to the voltage value Ux of the storage battery forms a current reference value I1 through a first PI controller, then the difference obtained by the difference between the current reference value I1 and the current Ix flowing through the storage battery continuously forms a voltage control signal through the first PI controller, and finally forms a signal influencing the on and off of the bidirectional DC/DC1, namely a discharging signal or a charging signal through a PWM unit;
the third control signal generation mode is as follows:
the state of charge SOC of the battery a has a great influence on the service life thereof, and frequent overshooting and overdischarging can lead to a severe shortening of the service life of the battery a. Therefore, setting a threshold for the SOC herein minimizes the hazards of overshoot and overdischarge, resulting in three modes of operation:
(1) when the SOC is less than the SOCmin, the energy storage element is in an over-discharge state, the continuous discharge can seriously affect the service life of the storage battery A, the output of the charging section is 1, the output of the discharging section is 0, and finally a charging signal is formed, so that the storage battery only allows charging and does not allow discharging.
(2) When SOCmin < SOC < SOCmax, the SOC of the energy storage element is in a normal state, at the moment, the output of the charging section is 1, the output of the discharging section is 1, and the storage battery A is in a normal working state and can be charged and discharged.
(3) When SOCmax is less than SOC, the energy storage element is in an overshoot state, the output of the charging section is 0, the output of the discharging section is 1, finally, a discharging signal is formed, and the storage battery only allows discharging but not allows charging.
The fifth charge-discharge control signal is generated in the following manner:
when charge-discharge current is too big, the electric current of impulsive nature can cause the damage to the switch tube, finally influences control performance, need install the amplitude limiting module additional to the PI controller, through price comparator and AND gate unit NOT cooperation, current value Ix input comparator with current reference value I1 and battery obtains the comparison result and is divided into two, and one directly is as the signal that charges, and one is through AND gate unit NOT anti-just as the signal that discharges, then:
(1) if the current value Ix of the storage battery is less than the current reference value I1, outputting a charging permission signal and not outputting a discharging permission signal;
(2) and if the current value Ix of the storage battery is larger than the current reference value I1, outputting a charge disallowing signal and a discharge allowing signal.
Charging signals in the first charging AND discharging control signal, the third charging AND discharging control signal AND the fifth charging AND discharging control signal are input into an AND gate unit AND together, output results are input into a charging signal input Q1, AND charging control is carried out on the first bidirectional DC/DC converter; the discharge signals among the first, third, AND fifth charge AND discharge control signals are input to another AND gate AND, AND the output result is input to a discharge signal input Q2, thereby performing discharge control on the first bidirectional DC/DC converter. Preferably, the third charge and discharge control signal and the fifth charge and discharge control signal may be used alternatively or may be omitted altogether.
Specifically, the second bidirectional DC/DC converter comprises a ratio calculation unit, a difference calculation unit, a second PI controller, a PWM unit, a comparator, an AND gate unit NOT, two AND gate units AND, AND a withstand voltage protection module D; the charge AND discharge signals in the second charge AND discharge control signal, the fourth charge AND discharge control signal AND the sixth charge AND discharge control signal are respectively merged AND input into an AND gate unit to obtain output signals to control the charge AND discharge of the second bidirectional DC/DC converter
Wherein, the second control signal generation mode is as follows:
firstly, the set voltage Uc of the super capacitor and the terminal voltage Usc of the super capacitor are subjected to difference and the difference is input into a second PI controller, the power Pc distributed to the super capacitor is divided by the terminal voltage Usc of the super capacitor to form a current reference value I2, then the difference obtained by the difference between the current reference value I2 and the self current Ic of the super capacitor continuously forms a voltage control signal through a third PI controller, and finally the on and off of the bidirectional DC/DC2 are influenced through a PWM unit by adopting a control mode of a voltage outer ring and a current inner ring, namely a discharging signal or a charging signal;
the fourth control signal generation mode is as follows:
the charge and discharge control mode of the super capacitor B is similar to that of the storage battery A, and although the capacity of the super capacitor B is far higher than that of a common capacitor, the voltage resistance of the super capacitor B is lower than that of the common capacitor. If the voltage Usc at the super capacitor is too high, the capacitor can be broken down and even explode. Too low affects the performance of the supercapacitor, so it is also necessary to set a reasonable threshold for the supercapacitor end Usc:
(1) when Usc < Uscin, the terminal voltage Usc is too low, the output of the charging section is 1, the output of the discharging section is 0, and finally a charging signal is formed, so that the super capacitor only allows charging and does not allow discharging.
(2) When Usicmin < Usc < Usicmax, the super capacitor is in a normal working mode, the output of the charging section is 1, the output of the discharging section is 1, and charging and discharging can be carried out.
(3) When Ucmc < Usc, the terminal voltage Usc is too high, the output of the charging section is 0, the output of the discharging section is 1, and finally a discharging signal is formed, so that the super capacitor only allows discharging but not charging.
The sixth charge and discharge control signal is generated in the following manner:
similarly, an amplitude limiting module needs to be additionally arranged on the PI controller, the comparator is matched with the and gate unit NOT through the comparator, the current reference value I2 and the current value Ic of the super capacitor are input into the comparator, the obtained comparison result is divided into two parts, one part is directly used as a charging signal, and the other part is used as a discharging signal through the and gate unit NOT, so that:
(1) if the current value Ic of the super capacitor is less than the current reference value I2, outputting a charging permission signal and a discharging non-permission signal;
(2) if the current value Ic of the super capacitor is larger than the current reference value I2, the charge disallowing signal and the discharge allowing signal are output.
Charging signals in the second, fourth AND sixth charging AND discharging control signals are input into an AND gate unit AND together, AND the output result is input into a charging signal input Q3 to control the charging of the second bidirectional DC/DC converter; the discharge signals among the first, third, AND fifth charge/discharge control signals are input to another AND gate AND in common, AND the output result is input to a discharge signal input Q4, thereby performing discharge control on the second bidirectional DC/DC converter. Preferably, the fourth charge and discharge control signal and the sixth charge and discharge control signal may be used alternatively or may be omitted altogether.
According to the energy management strategy of the hybrid energy storage system, on one hand, the storage battery is controlled to realize charging and discharging, and meanwhile, the storage battery is subjected to overshoot and over-discharge protection, so that the service life of the storage battery is prolonged; on the other hand, when the super capacitor is controlled, the super capacitor is protected against voltage, so that the service life of the whole hybrid energy storage system is prolonged.
It should be noted that the above-mentioned only illustrates the preferred embodiments and principles of the present invention, and that those skilled in the art will be able to make modifications to the embodiments based on the idea of the present invention, and that such modifications should be considered as the protection scope of the present invention.
Claims (2)
1. A hybrid energy storage system energy management strategy is characterized in that the hybrid energy storage system comprises a storage battery, a super capacitor, a first bidirectional DC/DC converter and a second bidirectional DC/DC converter, the first bidirectional DC/DC converter is used for controlling charging and discharging of the storage battery, the second bidirectional DC/DC converter is used for controlling charging and discharging of the super capacitor, the energy management strategy comprises a control strategy for the first bidirectional DC/DC converter and a control strategy for the second bidirectional DC/DC converter, and the control strategies comprise the following steps:
control strategy of the first bidirectional DC/DC converter:
acquiring power Px distributed to a storage battery, a voltage value Ux of the storage battery and a current value Ix of the storage battery; calculating a ratio of the power Px of the storage battery to the voltage value Ux of the storage battery to obtain a current reference value I1, calculating a difference value between the current reference value I1 and the current value Ix of the storage battery, and inputting the difference value into a first PI controller to obtain a voltage control signal, wherein the voltage control signal forms a first charge and discharge control signal of a first bidirectional DC/DC converter through a first PWM unit;
control strategy of the second bidirectional DC/DC converter:
acquiring power Pc distributed to a super capacitor, a set voltage Uc of the super capacitor, a terminal voltage Usc of the super capacitor and a current value Ic of the super capacitor; performing difference on the set voltage Uc of the super capacitor and the terminal voltage Usc of the super capacitor and inputting the difference into a second PI controller; calculating the ratio of the power Pc of the super capacitor to the terminal voltage Usc of the super capacitor to obtain a current reference value I2, calculating the difference value of the current reference value I2 and the current value Ic of the super capacitor, inputting the difference value into a third PI controller, superposing the second PI controller and the third PI controller to obtain voltage control signals of a voltage outer ring and a current inner ring, and forming second charge and discharge control signals of a second bidirectional DC/DC converter by the voltage control signals of the voltage outer ring and the current inner ring through a second PWM unit;
the control strategy of the first bidirectional DC/DC converter further comprises a charge state protection module of the storage battery, the charge state protection module of the storage battery is used for sending a third charge and discharge control signal to the first bidirectional DC/DC converter according to the charge state of the storage battery, the charge signal and the discharge signal in the third charge and discharge control signal and the first charge and discharge control signal are respectively merged and input into an AND gate unit to obtain an output signal for controlling the charge and discharge of the first bidirectional DC/DC converter, and the third charge and discharge control signal is generated in the following mode:
acquiring the real-time SOC, the minimum SOC SOCmin and the maximum SOC SOCmax of the storage battery, and judging:
(1) when the SOC is less than SOCmin, outputting a charge allowing signal and not outputting a discharge allowing signal;
(2) outputting a charge enable signal and a discharge enable signal when SOCmin < SOC < SOCmax;
(3) when SOCmax < SOC, outputting a charge disallowing signal and a discharge allowing signal;
the control strategy of the second bidirectional DC/DC converter further comprises a voltage-withstanding protection module of a super capacitor, the voltage-withstanding protection module of the super capacitor is used for sending a fourth charge and discharge control signal to the second bidirectional DC/DC converter according to the terminal voltage state of the super capacitor, the charge signal and the discharge signal in the fourth charge and discharge control signal and the second charge and discharge control signal are respectively merged and input into an AND gate unit to obtain an output signal for controlling the charge and discharge of the second bidirectional DC/DC converter, and the fourth charge and discharge control signal is generated in the following mode:
acquiring a terminal voltage Usc, a minimum terminal voltage Usicmin and a maximum terminal voltage Usicmax of the super capacitor, and judging:
(1) when Usc < Usicmin, outputting a charging permission signal and not outputting a discharging permission signal;
(2) when Usicmin < Usc < Usicmax, outputting a charging permission signal and a discharging permission signal;
(3) when Ucmc < Usc, outputting a charge disallowance signal and a discharge allowing signal;
the control strategy of the first bidirectional DC/DC converter further comprises a first amplitude limiting module, the first amplitude limiting module is used for sending a fifth charge and discharge control signal to the second bidirectional DC/DC converter according to the current state of the storage battery, the fifth charge and discharge control signal and the first charge and discharge control signal and the charge signal and the discharge signal in the third charge and discharge control signal are respectively merged and input into an AND gate unit to obtain an output signal for controlling the charge and discharge of the first bidirectional DC/DC converter, and the fifth charge and discharge control signal is generated in the following mode:
inputting the current reference value I1 and the current value Ix of the storage battery into a comparator, and obtaining a comparison result and outputting the comparison result through the matching of a NOT gate unit:
(1) if the current value Ix of the storage battery is less than the current reference value I1, outputting a charging permission signal and not outputting a discharging permission signal;
(2) if the current value Ix of the storage battery is larger than the current reference value I1, outputting a charge disallowance signal and a discharge allow signal;
the control strategy of the second bidirectional DC/DC converter further comprises a second amplitude limiting module, the second amplitude limiting module is used for sending a sixth charging and discharging control signal to the second bidirectional DC/DC converter according to the current state of the super capacitor, the sixth charging and discharging control signal and the first charging and discharging control signal as well as the charging signal and the discharging signal in the third charging and discharging control signal are respectively merged and input into an AND gate unit to obtain an output signal for controlling the charging and discharging of the first bidirectional DC/DC converter, and the sixth charging and discharging control signal is generated in the following mode:
inputting the current reference value I2 and the current value Ic of the super capacitor into a comparator, and obtaining a comparison result and outputting the comparison result through the cooperation of a NOT gate unit:
(1) if the current value Ic of the super capacitor is less than the current reference value I2, outputting a charging permission signal and a discharging non-permission signal;
(2) if the current value Ic of the super capacitor is larger than the current reference value I2, the charge disallowing signal and the discharge allowing signal are output.
2. The energy management strategy of claim 1, wherein the first bidirectional DC/DC converter comprises an inductor L1, a switching tube S1 and a switching tube S2, and the second bidirectional DC/DC converter comprises an inductor L2, a switching tube S3 and a switching tube S4.
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