CN111262313B - Battery charging control device and method and photovoltaic energy storage system - Google Patents
Battery charging control device and method and photovoltaic energy storage system Download PDFInfo
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- CN111262313B CN111262313B CN202010238914.7A CN202010238914A CN111262313B CN 111262313 B CN111262313 B CN 111262313B CN 202010238914 A CN202010238914 A CN 202010238914A CN 111262313 B CN111262313 B CN 111262313B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
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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
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention is applicable to the technical field of batteries, and discloses a battery charging control device and method and a photovoltaic energy storage system. The battery charge control device includes: the first current generation ring generates a first current according to the larger of the single-side bus voltage limit value and the positive and negative bus voltages; the second current generation loop generates a second current according to the preset voltage; the small unit takes the smaller of the first current and the second current as output; generating a first voltage by the positive and negative bus unbalance ring according to the voltage difference of the positive and negative buses; the second voltage generation ring generates a second voltage according to the output of the small unit; the first duty ratio unit generates a first duty ratio for regulating the voltage according to the first voltage and the second voltage; the second duty cycle unit generates a second duty cycle for adjusting the voltage according to the first voltage and the second voltage. The battery charging control device can realize battery charging deviation correction.
Description
Technical Field
The invention belongs to the technical field of batteries, and particularly relates to a battery charging control device and method and a photovoltaic energy storage system.
Background
When the positive and negative buses are respectively provided with the positive and negative battery groups to charge the battery pack, the bus midpoint control expectation is added into a charging control loop to realize the balance of the positive and negative buses. However, for various reasons, the two batteries are prone to charge with unequal charging currents. Even if bus midpoint control is available, when the charging current of one battery pack is reduced to a certain value, the bus midpoint control function is relatively limited, and negative effects can be brought if artificial correction is not performed at the moment. For example, the bus voltage may be biased and even cause unbalanced protection, or the uneven charging of two battery packs may cause unbalanced cell midpoint along with the accumulation of time, and the battery pack with low charge is discharged too deeply and easily damages the battery.
Disclosure of Invention
In view of this, embodiments of the present invention provide a battery charging control apparatus and method and a photovoltaic energy storage system, so as to solve the problem of non-uniform charging of two battery packs.
A first aspect of an embodiment of the present invention provides a battery charge control apparatus, including:
the first current generation ring is used for generating a first current according to the larger of the single-side bus voltage limit value and the positive and negative bus voltages;
a second current generation loop for generating a second current according to a preset voltage;
a small-taking unit for taking the smaller of the first current and the second current as an output;
the positive and negative bus unbalance ring is used for generating a first voltage according to the voltage difference of the positive and negative buses;
a second voltage generation loop for generating a second voltage according to the output of the small fetching unit;
a first duty cycle unit for generating a first duty cycle for regulating a voltage according to the first voltage and the second voltage; the first duty ratio is used for feeding back to a positive bus voltage boost circuit of the photovoltaic energy storage system;
a second duty cycle unit for generating a second duty cycle for regulating the voltage according to the first voltage and the second voltage; and the second duty ratio is used for feeding back to a negative bus voltage boost circuit of the photovoltaic energy storage system.
Optionally, the first current generation loop comprises:
the first adder is used for adding the limit value of the voltage of the single-side bus and the larger voltage of the positive bus and the negative bus to obtain a first deviation voltage;
the first PI unit is used for carrying out first PI regulation processing on the first deviation voltage;
and the first amplitude limiting unit is used for adjusting the amplitude of the current output by the first PI unit to generate the first current.
Optionally, the preset voltage is a sampling voltage obtained by sampling a photovoltaic unit of the photovoltaic energy storage system, and the second current generation loop includes:
the MPPT unit is used for tracking a maximum power point in real time according to sampling voltage obtained by sampling the photovoltaic unit and power corresponding to sampling current to obtain reference voltage of the photovoltaic unit;
the second adder is used for adding the reference voltage and the actual voltage of the photovoltaic unit to obtain a second deviation voltage;
and the second PI unit is used for carrying out second PI regulation processing on the second deviation voltage to obtain the second current.
Optionally, the positive and negative bus bar unbalanced ring includes:
the third adder is used for adding the difference between zero and the positive and negative bus voltages to obtain a third deviation voltage;
a third PI unit configured to perform a third PI adjustment process on the third offset voltage;
and the second amplitude limiting unit is used for carrying out amplitude adjustment on the voltage output by the third PI unit to generate the first voltage.
Optionally, the second voltage generation loop includes:
the fourth adder is used for adding the output of the small taking unit and the actual current of the photovoltaic unit of the photovoltaic energy storage system to obtain a first deviation current;
and a fourth PI unit configured to perform fourth PI adjustment processing on the first offset current to generate the second voltage.
Optionally, the first duty cycle unit is configured to determine a sum voltage of the second voltage and the first voltage, and calculate the first duty cycle according to the sum voltage and a bus voltage;
the second duty cycle unit is used for determining a difference voltage of the second voltage and the first voltage and calculating the second duty cycle according to the difference voltage and the bus voltage.
Optionally, the first duty cycle unit is specifically configured to calculate the first duty cycle according to a quotient of the sum voltage and the bus voltage;
the second duty cycle unit is specifically configured to calculate the second duty cycle according to a quotient of the difference voltage and the bus voltage.
The second aspect of the embodiment of the invention also provides a photovoltaic energy storage system, which comprises a photovoltaic unit, a positive bus voltage lifting circuit, a negative bus voltage lifting circuit, a positive bus and a negative bus; the photovoltaic unit provides electric energy for the positive bus through the positive bus voltage lifting circuit and provides electric energy for the negative bus through the negative bus voltage lifting circuit; the positive bus and the negative bus can be connected with corresponding battery packs to charge the corresponding battery packs;
wherein the energy storage system further comprises:
the battery charging control device is used for generating a first duty ratio and a second duty ratio of regulated voltage according to the voltages output by the positive bus, the negative bus and the photovoltaic unit; the first duty ratio is fed back to the positive bus voltage boost circuit, and the second duty ratio is fed back to the negative bus voltage boost circuit.
Optionally, the battery charging control device is specifically configured to:
generating a first current according to the larger of the single-side bus voltage limit value and the positive and negative bus voltages;
generating a second current according to a preset voltage;
obtaining the smaller of the first current and the second current;
generating a first voltage according to the difference between the positive and negative bus voltages;
generating a second voltage from the lesser of the first current and the second current;
generating a first duty cycle and a second duty cycle for regulating a voltage from the first voltage and the second voltage; the first duty ratio is used for feeding back to a positive bus voltage boosting circuit of the photovoltaic energy storage system, and the second duty ratio is used for feeding back to a negative bus voltage boosting circuit of the photovoltaic energy storage system.
A third aspect of an embodiment of the present invention provides a battery charging control method, including:
generating a first current through a first current generation ring according to the limited value of the voltage of the single-side bus and the larger voltage of the positive bus and the negative bus;
generating a second current according to the preset voltage through a second current generation ring;
taking the smaller of the first current and the second current as an output by a small unit;
generating a first voltage according to the voltage difference of the positive bus and the negative bus through the positive bus and the negative bus unbalance ring;
generating a second voltage according to the output of the small fetching unit through a booster ring;
generating, by a first duty cycle unit, a first duty cycle for regulating a voltage from the first voltage and the second voltage; the first duty ratio is used for feeding back to a positive bus voltage boost circuit of the photovoltaic energy storage system;
generating, by a second duty cycle unit, a second duty cycle for regulating a voltage from the first voltage and the second voltage; and the second duty ratio is used for feeding back to a negative bus voltage boost circuit of the photovoltaic energy storage system.
In the embodiment of the invention, a first current generation ring generates a first current according to a single-side bus voltage limit value and the larger of positive and negative bus voltages, a second current generation ring generates a second current according to a preset voltage, the smaller of the first current and the second current of a small unit is taken as output to a second voltage generation ring, a positive and negative bus unbalanced ring generates a first voltage according to the difference between the positive and negative bus voltages, a second voltage generation ring generates a second voltage according to the output of the small unit, a first duty ratio unit generates a first duty ratio for adjusting the voltage according to the first voltage and the second voltage, a second duty ratio unit generates a second duty ratio for adjusting the voltage according to the first voltage and the second voltage, the first duty ratio is fed back to a positive bus voltage lifting circuit of a photovoltaic energy storage system, and the second duty ratio is fed back to a negative bus voltage lifting circuit of the photovoltaic energy storage system, therefore, when the bus on one side with small charging power is changed to be high due to the fact that the charging power of the photovoltaic energy storage system is not uniform, the positive battery pack and the negative battery pack can extract energy from the bus at a relatively balanced speed through the control of the battery charging control device, and the purpose of battery charging deviation correction is achieved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a battery charging control apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a battery charging control apparatus according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a photovoltaic energy storage system provided by an embodiment of the invention;
fig. 4 is a flowchart illustrating a battery charging control method according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
Fig. 1 is a schematic structural diagram of a battery charging control apparatus according to an embodiment of the present invention, and only a part related to the embodiment of the present invention is shown for convenience of description.
As shown in fig. 1, the battery charge control apparatus may include a first current generation loop 100, a second current generation loop 200, a small cell 300, a positive-negative bus unbalance loop 400, a second voltage generation loop 500, a first duty cycle unit 600, and a second duty cycle unit 700.
A first current generation loop 100 for generating a first current according to the greater of the single-sided bus voltage limit and the positive and negative bus voltages;
a second current generating loop 200 for generating a second current according to a preset voltage;
a small-taking unit 300 for taking the smaller of the first current and the second current as an output;
a positive-negative bus bar unbalance ring 400 for generating a first voltage according to a difference between positive and negative bus bar voltages;
a second voltage generation loop 500, configured to generate a second voltage according to the output of the small cell;
a first duty cycle unit 600 for generating a first duty cycle for regulating a voltage according to the first voltage and the second voltage; the first duty ratio is used for feeding back to a positive bus voltage boost circuit of the photovoltaic energy storage system;
a second duty cycle unit 700 for generating a second duty cycle for regulating the voltage according to the first voltage and the second voltage; and the second duty ratio is used for feeding back to a negative bus voltage boost circuit of the photovoltaic energy storage system.
In the above battery charging control apparatus, the first current generation ring 100 generates a first current according to the greater of the single-side bus voltage limit value and the positive and negative bus voltages, the second current generation ring 200 generates a second current according to a preset voltage, the smaller of the first current and the second current of the small unit 300 is taken as an output to be sent to a second voltage generation ring, the positive and negative bus unbalanced ring 400 generates a first voltage according to the difference between the positive and negative bus voltages, the second voltage generation ring 500 generates a second voltage according to the output of the small unit, the first duty ratio unit 600 generates a first duty ratio for adjusting the voltage according to the first voltage and the second voltage, the second duty ratio unit 700 generates a second duty ratio for adjusting the voltage according to the first voltage and the second voltage, the first duty ratio is fed back to the positive bus voltage boost circuit of the photovoltaic energy storage system, and the second duty ratio is fed back to the negative bus voltage boost circuit of the photovoltaic energy storage system, therefore, when the bus on one side with small charging power is changed to be high due to the fact that the charging power of the photovoltaic energy storage system is not uniform, the positive battery pack and the negative battery pack can extract energy from the bus at a relatively balanced speed through the control of the battery charging control device, and the purpose of battery charging deviation correction is achieved.
Referring to fig. 2, in some embodiments, the first current generation loop 100 may include a first adder 110, a first PI unit 120, and a first clipping unit 130. The first adder 110 is configured to add the limit value of the single-side bus voltage and the larger of the positive and negative bus voltages to obtain a first offset voltage; the first PI unit 120 is configured to perform a first PI adjustment process on the first offset voltage; the first amplitude limiting unit 130 is configured to perform amplitude adjustment on the current output by the first PI unit 120, so as to generate the first current.
As shown in fig. 2, the bus positive voltage is U, for examplebus_PThe voltage of the negative pole of the bus is Ubus_N，max(Ubus_P，Ubus_N) For taking the positive voltage U of the busbus_PAnd the voltage of the negative electrode of the bus is Ubus_NThe larger of these; u shapebus_MaxSetThe limited value of the single-side bus voltage (i.e. the maximum voltage allowed by the single side of the bus) is obtained.
Wherein the first deviation voltage may be max (U)bus_P，Ubus_N) And Ubus_MaxSetThe difference of (a). The first PI adjustment process in the embodiment of the present application may be to form a control deviation according to a given value and an actual output value, and form a control amount by linearly combining a proportion and an integral of the deviation, so as to control the controlled object. For example, the first PI adjustment process may employ the formula of
Where kp is the proportionality coefficient, ki is the integral coefficient, and e (k) is the current valueAnd determining the error amount of actual feedback, wherein k is a positive integer.
Referring to fig. 2, in some embodiments, the preset voltage is a sampled voltage sampled by a photovoltaic unit of the photovoltaic energy storage system, and the second current generation loop 200 may include an MPPT unit 210, a second adder 220, and a second PI processing unit 230. The MPPT (Maximum Power Point Tracking) unit 210 is configured to track a Maximum Power Point in real time according to a sampling voltage obtained by sampling a photovoltaic unit of the photovoltaic energy storage system and a Power corresponding to a sampling current, so as to obtain a reference voltage of the photovoltaic unit; the second adder 220 is configured to add the reference voltage of the photovoltaic unit and the actual voltage of the photovoltaic unit to obtain a second offset voltage; the second PI unit 230 is configured to perform a second PI adjustment process on the second offset voltage to obtain a second current.
As shown in fig. 2, P is the power corresponding to the sampling voltage and the sampling current obtained by sampling the photovoltaic unit, and U is an exemplary powerpvref is the reference voltage of the photovoltaic cell, UpvIs the sampled voltage of the photovoltaic unit. The second error voltage may be a reference voltage U of the photovoltaic unitpvref and photovoltaic unit's sampling voltage UpvThe difference of (a). By way of example, the photovoltaic cells of the photovoltaic energy storage system may be photovoltaic panels PV.
Referring to fig. 2, in some embodiments, the positive and negative bus imbalance ring 400 may include a third adder 410, a third PI unit 420, and a second clipping unit 430. Wherein the third adder 410 is used for adding zero and the positive and negative motherComparing the line voltage differences to obtain a third deviation voltage; the third PI unit 420 is configured to perform a third PI adjustment process on the third offset voltage; the second amplitude limiting unit 430 is configured to perform amplitude adjustment on the voltage output by the third PI unit to generate a first voltage. As shown in fig. 2, illustratively, Ubus_deltaIs the difference between the positive and negative bus voltages.
Referring to fig. 2, in some embodiments, the second voltage generation loop 500 may include a fourth adder 510, a fourth PI unit 520. The fourth adder 510 is configured to add the output of the small-taking unit and the actual current of the PV to obtain a first offset current; the fourth PI unit 520 is configured to perform a fourth PI adjustment process on the first offset current to generate the second voltage.
As a possible implementation manner, the first duty cycle unit 600 may be configured to determine a sum voltage of the second voltage and the first voltage, and calculate the first duty cycle according to the sum voltage and a bus voltage; the second duty cycle unit 700 is configured to determine a difference voltage between the second voltage and the first voltage, and calculate the second duty cycle according to the difference voltage and a bus voltage.
For example, the first duty cycle unit 600 may be specifically configured to operate according to the sum voltage and the bus voltage UbusCalculating the first duty cycle; the second duty cycle unit 700 may specifically be configured to operate according to the difference voltage and the bus voltage UbusCalculates the second duty cycle.
For example, referring to fig. 2, the first duty cycle unit 600 may include a fifth adder 610 and a first duty cycle module 620. The fifth adder 610 is configured to add the second voltage and the first voltage to obtain a sum voltage of the second voltage and the first voltage; the first duty cycle module 620 is used for calculating a first duty cycle according to the quotient of the sum voltage and the bus voltage output by the fifth adder 610.
For example, referring to fig. 2, the second duty cycle unit 700 may include a sixth adder 710 and a second duty cycle module 720. The sixth adder 540 is configured to add the second voltage and the first voltage to obtain a difference voltage therebetween; the second duty cycle module 720 is configured to calculate a second duty cycle according to a quotient of the difference voltage output by the sixth adder 710 and the bus voltage.
As shown in fig. 2, exemplary, IpvThe first offset current may be the actual current of the photovoltaic cell, and the output of the small cell 300 may be taken as the actual current I of the photovoltaic cellpvThe difference of (a).
In the above battery charging control apparatus, the first current generation ring 100 generates a first current according to the greater of the single-side bus voltage limit value and the positive and negative bus voltages, the second current generation ring 200 generates a second current according to a preset voltage, the smaller of the first current and the second current of the small unit 300 is taken as an output to be sent to a second voltage generation ring, the positive and negative bus unbalanced ring 400 generates a first voltage according to the difference between the positive and negative bus voltages, the second voltage generation ring 500 generates a second voltage according to the output of the small unit, the first duty ratio unit 600 generates a first duty ratio for adjusting the voltage according to the first voltage and the second voltage, the second duty ratio unit 700 generates a second duty ratio for adjusting the voltage according to the first voltage and the second voltage, the first duty ratio is fed back to the positive bus voltage boost circuit of the photovoltaic energy storage system, and the second duty ratio is fed back to the negative bus voltage boost circuit of the photovoltaic energy storage system, therefore, when the bus on one side with small charging power is changed to be high due to the fact that the charging power of the photovoltaic energy storage system is not uniform, the positive battery pack and the negative battery pack can extract energy from the bus at a relatively balanced speed through the control of the battery charging control device, and the purpose of battery charging deviation correction is achieved.
Fig. 3 shows a schematic flow chart of a photovoltaic energy storage system provided by an embodiment of the present invention, corresponding to the battery charging control apparatus described in the above embodiments. For convenience of explanation, only the portions related to the present embodiment are shown.
Referring to fig. 3, the photovoltaic energy storage system may include a photovoltaic unit 10, a positive bus voltage boost circuit 20, a negative bus voltage boost circuit 30, a positive bus 40, and a negative bus 50; the photovoltaic unit 10 provides electric energy for the positive bus 40 through the positive bus voltage boost circuit 20, and provides electric energy for the negative bus 50 through the negative bus voltage boost circuit 30; the positive bus 40 and the negative bus 50 can be connected with corresponding battery packs to charge the corresponding battery packs. For example, the positive bus bar 40 is connected to the positive battery group 70 to charge the positive battery group 70, and the negative bus bar 50 is connected to the negative battery group 800 to charge the negative battery group 800.
The energy storage system may further include a battery charging control device 60. The battery charging control device 60 is used for generating a first duty ratio and a second duty ratio of the regulated voltage according to the voltages output by the positive bus 40, the negative bus 50 and the photovoltaic unit 10; the first duty cycle is fed back to the positive bus voltage boost circuit 20 and the second duty cycle is fed back to the negative bus voltage boost circuit 30.
By way of example, the photovoltaic unit 10 may be a photovoltaic panel PV.
In the photovoltaic energy storage system, the photovoltaic unit 10 provides electric energy for the positive bus 40 through the positive bus voltage boost circuit 20, the negative bus 50 is provided with electric energy through the negative bus voltage boost circuit 30, the positive bus 40 and the negative bus 50 can be connected with corresponding battery packs to charge the corresponding battery packs, the battery charging control device 60 generates a first duty ratio and a second duty ratio of regulated voltage according to the voltage of the positive bus 40, the voltage of the negative bus 50 and the voltage of the photovoltaic unit 10, the first duty ratio is fed back to the positive bus voltage boost circuit 20, the second duty ratio is fed back to the negative bus voltage boost circuit 30, so that when the charging power of the battery pack is not uniform and the side bus bar with small charging power becomes high, through the control of the battery charging control device, the two battery packs extract energy from the bus at a relatively balanced speed, and the purpose of battery charging deviation correction is achieved.
Fig. 4 is a schematic flow chart of a battery charging control method according to an embodiment of the present invention, corresponding to the battery charging control apparatus according to the above embodiment. For convenience of explanation, only the portions related to the present embodiment are shown.
Referring to fig. 4, the battery charge control method may include the steps of:
in step 401, a first current is generated by a first current generation loop according to the greater of the single-sided bus voltage limit and the positive and negative bus voltages.
In step 402, a second current is generated according to a preset voltage by a second current generation loop.
In step 403, the smaller of the first current and the second current is taken as an output by the small cell.
In step 404, a first voltage is generated from the difference between the positive and negative bus voltages through the positive and negative bus imbalance ring.
In step 405, a second voltage is generated from the output of the decimating cell by a boost ring.
Generating, by a first duty cycle unit, a first duty cycle for a regulated voltage from the first voltage and the second voltage in step 306; the first duty ratio is used for feeding back to a positive bus voltage boost circuit of the photovoltaic energy storage system;
generating, by a second duty cycle unit, a second duty cycle for regulating the voltage from the first voltage and the second voltage in step 307; and the second duty ratio is used for feeding back to a negative bus voltage boost circuit of the photovoltaic energy storage system.
The battery charging control method comprises the steps that a first current generation ring generates a first current according to a limited value of a single-side bus voltage and the larger of a positive bus voltage and a negative bus voltage, a second current generation ring generates a second current according to a preset voltage, the smaller of the first current and the second current of a small unit is taken as output to a second voltage generation ring, a positive bus unbalanced ring and a negative bus unbalanced ring generate a first voltage according to the difference of the positive bus voltage and the negative bus voltage, the second voltage generation ring generates a second voltage according to the output of the small unit, a first duty ratio unit generates a first duty ratio for adjusting the voltage according to the first voltage and the second voltage, a second duty ratio unit generates a second duty ratio for adjusting the voltage according to the first voltage and the second voltage, the first duty ratio is fed back to a positive bus voltage lifting circuit of the photovoltaic energy storage system, and the second duty ratio is fed back to a negative bus voltage lifting circuit of the photovoltaic energy storage system, therefore, when the bus on one side with small charging power is changed to be high due to the fact that the charging power of the photovoltaic energy storage system is not uniform, the positive battery pack and the negative battery pack can extract energy from the bus at a relatively balanced speed through the control of the battery charging control device, and the purpose of battery charging deviation correction is achieved.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other ways. For example, the above-described embodiments of the apparatus/terminal device are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (9)
1. A battery charge control device, comprising:
the first current generation ring is used for generating a first current according to the larger of the single-side bus voltage limit value and the positive and negative bus voltages;
the second current generation loop is used for generating a second current according to a preset voltage, wherein the preset voltage is a sampling voltage obtained by sampling a photovoltaic unit of the photovoltaic energy storage system;
a small-taking unit for taking the smaller of the first current and the second current as an output;
the positive and negative bus unbalance ring is used for generating a first voltage according to the voltage difference of the positive and negative buses;
a second voltage generation loop for generating a second voltage according to the output of the small fetching unit;
a first duty cycle unit for generating a first duty cycle for regulating a voltage according to the first voltage and the second voltage; the first duty ratio is used for feeding back to a positive bus voltage boost circuit of the photovoltaic energy storage system;
a second duty cycle unit for generating a second duty cycle for regulating the voltage according to the first voltage and the second voltage; and the second duty ratio is used for feeding back to a negative bus voltage boost circuit of the photovoltaic energy storage system.
2. The battery charge control device of claim 1, wherein the first current generation loop comprises:
the first adder is used for adding the limit value of the voltage of the single-side bus and the larger voltage of the positive bus and the negative bus to obtain a first deviation voltage;
the first PI unit is used for carrying out first PI regulation processing on the first deviation voltage;
and the first amplitude limiting unit is used for adjusting the amplitude of the current output by the first PI unit to generate the first current.
3. The battery charge control device of claim 1, wherein the predetermined voltage is a sampled voltage sampled from a photovoltaic cell of a photovoltaic energy storage system, and the second current generation loop comprises:
the MPPT unit is used for tracking a maximum power point in real time according to sampling voltage obtained by sampling the photovoltaic unit and power corresponding to sampling current to obtain reference voltage of the photovoltaic unit;
the second adder is used for adding the reference voltage and the actual voltage of the photovoltaic unit to obtain a second deviation voltage;
and the second PI unit is used for carrying out second PI regulation processing on the second deviation voltage to obtain the second current.
4. The battery charge control device of claim 1, wherein the positive and negative bus bar imbalance ring comprises:
the third adder is used for adding the difference between zero and the positive and negative bus voltages to obtain a third deviation voltage;
a third PI unit configured to perform a third PI adjustment process on the third offset voltage;
and the second amplitude limiting unit is used for carrying out amplitude adjustment on the voltage output by the third PI unit to generate the first voltage.
5. The battery charge control device of claim 1, wherein the second voltage generation loop comprises:
the fourth adder is used for adding the output of the small taking unit and the actual current of the photovoltaic unit of the photovoltaic energy storage system to obtain a first deviation current;
and a fourth PI unit configured to perform fourth PI adjustment processing on the first offset current to generate the second voltage.
6. The battery charge control device of claim 1, wherein the first duty cycle unit is configured to determine a sum voltage of the second voltage and the first voltage, and to calculate the first duty cycle from the sum voltage and a bus voltage;
the second duty cycle unit is used for determining a difference voltage of the second voltage and the first voltage and calculating the second duty cycle according to the difference voltage and the bus voltage.
7. The battery charge control device of claim 6, wherein the first duty cycle unit is specifically configured to calculate the first duty cycle from a quotient of the sum voltage and the bus voltage;
the second duty cycle unit is specifically configured to calculate the second duty cycle according to a quotient of the difference voltage and the bus voltage.
8. A photovoltaic energy storage system is characterized by comprising a photovoltaic unit, a positive bus voltage lifting circuit, a negative bus voltage lifting circuit, a positive bus and a negative bus; the photovoltaic unit provides electric energy for the positive bus through the positive bus voltage lifting circuit and provides electric energy for the negative bus through the negative bus voltage lifting circuit; the positive bus and the negative bus can be connected with corresponding battery packs to charge the corresponding battery packs;
wherein the energy storage system further comprises:
the battery charging control device is used for generating a first duty ratio and a second duty ratio of regulated voltage according to the voltages output by the positive bus, the negative bus and the photovoltaic unit; the first duty ratio is fed back to the positive bus voltage boost circuit, and the second duty ratio is fed back to the negative bus voltage boost circuit;
the battery charging control device is specifically configured to:
generating a first current according to the larger of the single-side bus voltage limit value and the positive and negative bus voltages;
generating a second current according to a preset voltage, wherein the preset voltage is a sampling voltage obtained by sampling a photovoltaic unit of the photovoltaic energy storage system;
obtaining the smaller of the first current and the second current;
generating a first voltage according to the difference between the positive and negative bus voltages;
generating a second voltage from the lesser of the first current and the second current;
generating a first duty cycle and a second duty cycle for regulating a voltage from the first voltage and the second voltage; the first duty ratio is used for feeding back to a positive bus voltage boosting circuit of the photovoltaic energy storage system, and the second duty ratio is used for feeding back to a negative bus voltage boosting circuit of the photovoltaic energy storage system.
9. A battery charge control method, comprising:
generating a first current through a first current generation ring according to the limited value of the voltage of the single-side bus and the larger voltage of the positive bus and the negative bus;
generating a second current through a second current generation ring according to a preset voltage, wherein the preset voltage is a sampling voltage obtained by sampling a photovoltaic unit of the photovoltaic energy storage system;
taking the smaller of the first current and the second current as an output by a small unit;
generating a first voltage according to the voltage difference of the positive bus and the negative bus through the positive bus and the negative bus unbalance ring;
generating a second voltage according to the output of the small fetching unit through a booster ring;
generating, by a first duty cycle unit, a first duty cycle for regulating a voltage from the first voltage and the second voltage; the first duty ratio is used for feeding back to a positive bus voltage boost circuit of the photovoltaic energy storage system;
generating, by a second duty cycle unit, a second duty cycle for regulating a voltage from the first voltage and the second voltage; and the second duty ratio is used for feeding back to a negative bus voltage boost circuit of the photovoltaic energy storage system.
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