CN114825407A - Charging and discharging switching method, device, system and medium of bidirectional converter - Google Patents
Charging and discharging switching method, device, system and medium of bidirectional converter Download PDFInfo
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- CN114825407A CN114825407A CN202210710530.XA CN202210710530A CN114825407A CN 114825407 A CN114825407 A CN 114825407A CN 202210710530 A CN202210710530 A CN 202210710530A CN 114825407 A CN114825407 A CN 114825407A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
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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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
Abstract
The invention provides a charge-discharge switching method, a device, a system and a medium of a bidirectional converter, comprising the following steps: acquiring an actual power value and a given power value of energy storage equipment; obtaining a current given value of the energy storage device based on the power actual value and the power given value; judging the charge-discharge state of the loop according to the current given value; and determining the driving distribution of the bidirectional converter according to the loop charging and discharging states. Compared with the prior art, the charge-discharge state of the bidirectional converter is not required to be judged and switched by extra logic, so that the adoption and calculation cost is saved; the charge and discharge state can be identified according to the loop self variable, extra charge and discharge state judgment and switching strategies are not needed, the control is simplified, and the rapid charge and discharge switching is realized.
Description
Technical Field
The invention relates to the technical field of battery management, in particular to a charge-discharge switching method, a charge-discharge switching device, a charge-discharge switching system and a charge-discharge switching medium of a bidirectional converter.
Background
Along with the construction of the novel power system with new forms of energy as the main part, the proportion of new forms of energy electricity generation such as wind-powered electricity generation, photovoltaic is increasingly high in the electric wire netting, because new forms of energy electricity generation has randomness, undulant characteristics, can dispose energy storage equipment at new forms of energy station generally, provides the frequency modulation that extra power realized the new forms of energy through energy storage equipment to guarantee system response speed.
However, the conventional charge and discharge circuit with the energy storage device needs to judge and switch the charge and discharge state through various algorithms and logics, and when the logics are unreasonable, the charge and discharge state is repeatedly switched, so that the circuit is frequently charged and discharged in a short time, and the fast charge and discharge switching cannot be really realized.
Disclosure of Invention
The invention solves the problem of how to accelerate the charge-discharge switching speed of the charge-discharge circuit.
In order to solve the above problem, the present invention provides a charge/discharge switching method for a bidirectional converter, comprising:
acquiring an actual power value and a given power value of energy storage equipment; obtaining a current given value of the energy storage device based on the power actual value and the power given value; judging the charge-discharge state of the loop according to the current given value; and determining the driving distribution of the bidirectional converter according to the loop charging and discharging states.
Optionally, the determining the driving distribution of the bidirectional converter according to the loop charging and discharging state includes:
obtaining the given current value; acquiring an actual current value of the energy storage device; obtaining the working frequency of the bidirectional converter according to the given current value and the actual current value; and generating a primary side driving signal and a secondary side driving signal based on the working frequency according to the charge-discharge state of the loop, and performing driving distribution on the primary side and the secondary side of the bidirectional converter.
Optionally, the determining the charge-discharge state of the loop according to the given current value includes:
judging whether the given current value is greater than 0; if the given current value is greater than 0, judging that the bidirectional converter is in a charging state; and if the given current value is less than 0, judging that the bidirectional converter is in a discharging state.
Optionally, the generating, according to the charge-discharge state of the loop, a corresponding primary side driving signal and a corresponding secondary side driving signal based on the operating frequency, and performing driving distribution on the primary side and the secondary side of the bidirectional converter includes:
and when the charge-discharge state of the loop is a charge state, determining that the bidirectional converter is under a forward LLC working condition, and generating an LLC primary side driving signal and an LLC secondary side driving signal based on the working frequency of the bidirectional converter.
Optionally, the generating, according to the charge-discharge state of the loop, a corresponding primary side driving signal and a corresponding secondary side driving signal based on the operating frequency, and driving and distributing the primary side and the secondary side of the bidirectional converter further includes:
and when the charge-discharge state of the loop is a discharge state, determining that the bidirectional converter generates an SRC primary side driving signal and an SRC secondary side driving signal based on the working frequency of the bidirectional converter under a reverse SRC working condition.
Optionally, the obtaining a given current value of the energy storage device based on the actual power value and the given power value includes:
and carrying out proportional integral control on the difference between the given power value and the actual power value to obtain the given current value.
Optionally, the obtaining the operating frequency of the bidirectional converter according to the given current value and the actual current value includes:
and carrying out proportional integral control on the difference between the current set value and the current actual value to obtain the working frequency.
On the other hand, the present invention further provides a charge/discharge switching device of a bidirectional converter, including:
the acquisition module is used for acquiring an actual power value and a given power value of the energy storage equipment; a calculation module for obtaining a given current value of the energy storage device based on the actual power value and the given power value; the judging module is used for judging the charge and discharge state of the loop according to the current given value; and the distribution module is used for determining the driving distribution of the bidirectional converter according to the charge and discharge states of the loop.
In a third aspect, the present invention further provides a charge/discharge switching device for a bidirectional converter, including a memory and a processor;
the memory for storing a computer program; the processor is configured to implement the charge/discharge switching method of the bidirectional converter as described above when executing the computer program.
In a fourth aspect, the present invention further provides a charge-discharge switching system of a bidirectional converter, including the charge-discharge switching device of the bidirectional converter, an energy storage device, and the bidirectional converter;
the charging and discharging switching device of the bidirectional converter is electrically connected with the bidirectional converter, the high-voltage side of the bidirectional converter is electrically connected with the high-voltage bus, and the low-voltage side of the bidirectional converter is electrically connected with the energy storage device; the bidirectional converter comprises a high-voltage side switch tube group and a low-voltage side switch tube group, the high-voltage side switch tube group comprises at least four switch tubes, and the low-voltage side switch tube group comprises at least four switch tubes.
Compared with the prior art, the charge-discharge identification is carried out by measuring the self variable of the circuit where the bidirectional converter is located, the current set value required by the energy storage equipment is obtained through the power actual value and the power set value of the energy storage equipment, the charge-discharge state of a loop is judged, and then the drive distribution of the bidirectional converter is determined to control the charge-discharge state of the bidirectional converter.
Drawings
Fig. 1 is a schematic flow chart illustrating a charge-discharge switching method of a bidirectional converter according to an embodiment of the present invention;
fig. 2 is a system block diagram of a charge/discharge switching method of a bidirectional converter according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating a detailed step S300 of a charge/discharge switching method of a bidirectional converter according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating a detailed step S400 of a charge/discharge switching method of a bidirectional converter according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. While certain embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather are provided for a more thorough and complete understanding of the present invention. It should be understood that the drawings and the embodiments of the present invention are illustrative only and are not intended to limit the scope of the present invention.
It should be understood that the various steps recited in the method embodiments of the present invention may be performed in a different order and/or performed in parallel. Moreover, method embodiments may include additional steps and/or omit performing the illustrated steps. The scope of the invention is not limited in this respect.
The term "including" and variations thereof as used herein is intended to be open-ended, i.e., "including but not limited to". The term "based on" is "based, at least in part, on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "alternative embodiments". Relevant definitions for other terms will be given in the following description. It should be noted that the terms "first", "second", and the like in the present invention are only used for distinguishing different devices, modules or units, and are not used for limiting the order or interdependence relationship of the functions performed by the devices, modules or units.
It is noted that references to "a", "an", and "the" modifications in the present invention are intended to be illustrative rather than limiting, and that those skilled in the art will recognize that reference to "one or more" unless the context clearly dictates otherwise.
Along with the obvious decline of energy storage battery cost, the energy storage system launches rapidly in the application of each field of electric power system transmission and distribution usefulness, prior art generally makes a pass through thermoelectricity + energy storage combination frequency modulation system, the energy storage system can be used for coping with high-frequency fluctuation's random load component and partial pulsation component, the frequency modulation comprehensive index of unit has been improved by a wide margin, but the charge-discharge circuit of current energy storage system need judge and switch the charge-discharge state through various extra logics and lead to the switching process comparatively complicated, the logical unreasonable condition still can appear under some special circumstances, lead to the energy storage bidirectional converter to switch the charge-discharge state repeatedly, can not realize charge-discharge fast switch.
The charge-discharge switching method of the bidirectional converter provided by the invention can help the energy storage system to play a role in regulating and maintaining stability when participating in primary frequency modulation and secondary frequency modulation on the power generation side by simply and logically rapidly switching the charge-discharge mode, and the vehicle network interaction of the new energy automobile is also an important way for the energy storage to participate in the frequency modulation, so that the charge-discharge switching response speed of the bidirectional converter with the energy storage system has an important influence on the quality of regulating and maintaining stability.
As shown in fig. 1 and fig. 2, an embodiment of the present invention provides a charge/discharge switching method for a bidirectional converter, including:
and S100, acquiring an actual power value and a given power value of the energy storage device.
And step S200, obtaining a current given value of the energy storage device based on the power actual value and the power given value.
And step S300, judging the charge-discharge state of the loop according to the given current value.
And step S400, determining the drive distribution of the bidirectional converter according to the charge-discharge state of the loop.
In one embodiment, the energy storage device comprises a battery, the energy storage device is used as energy input of an energy storage bidirectional converter through a photovoltaic system, a wind energy system and other power generation systems, the energy input is respectively electrically connected with a high-voltage bus and the battery through a high-voltage side and a low-voltage side of the bidirectional converter, and the battery is selectively charged or the electric energy is directly transmitted to a power grid according to conditions.
Because the photovoltaic power generation system, the wind power generation system and the like have intermittence during power generation, power generation can be carried out in daytime or sunny days, and in addition, various emergency situations possibly exist under natural conditions to influence the power generation efficiency, so that the optimal working state cannot be reached when the power generation side participates in energy storage frequency modulation, for example, the weather condition suddenly gets better at a certain moment, the power generation side can provide enough electric energy in a short time, and at the moment, if the bidirectional inverter cannot rapidly switch the current charging and discharging state, the electric energy is possibly wasted. In the prior art, a relatively complex judgment logic is usually adopted to judge whether the charging and discharging states of the bidirectional converter need to be switched at the present moment, so that much time and energy are wasted; on the other hand, if the situation is complicated, the charge-discharge state may be repeatedly switched, and energy may be wasted.
In another embodiment, the energy storage device may be any device that can stably store electrical energy.
And obtaining the actual value of the battery power through a power measuring tool, obtaining the given value of the battery power, and determining the given value of the battery current through the difference between the actual value of the battery power and the given value of the battery power. The method comprises the steps of calculating power required by a given power value according to the actual working condition of a current battery and the rated working condition of the battery, calculating current required by the given power value under the current working condition according to the required power, judging whether the current loop charging and discharging state is a charging state or a discharging state according to the given value of the current battery, and determining the driving distribution of the bidirectional converter based on the current state. When the given value of the battery power is larger than the actual value of the battery power, the power of the battery at the current moment is not satisfied with the preset optimal power; and when the given value of the battery power is equal to the actual value of the battery power, the given value of the battery power indicates that the power of the battery at the current moment meets the preset optimal power.
Compared with the prior art, the method and the device have the advantages that the current set value is calculated through the power actual value and the power set value of the energy storage device, then the current working condition of the bidirectional converter is judged through the current set value, the driving distribution of two sides of the bidirectional converter is further determined, extra judgment logic is not needed to judge the charging and discharging states of the bidirectional converter, the adoption and calculation cost is saved, the judgment process is simplified, the judgment time can be effectively shortened, and the quick switching of charging and discharging of the bidirectional converter is realized. The actual power value of the energy storage device is measured, so that the automatic identification of the charge and discharge state of the loop can be realized, the required working parameters are less, the measurement cost can be effectively reduced, and meanwhile, the identification accuracy can be ensured. The charge and discharge state is identified according to the self variable in the bidirectional converter circuit, extra charge and discharge state judgment is not needed, the control logic and the control flow can be simplified, the requirement on the controller is low, and the charge and discharge function can be switched quickly.
Optionally, the obtaining a given current value of the energy storage device based on the actual power value and the given power value includes:
and carrying out proportional integral control on the difference between the given power value and the actual power value to obtain the given current value.
Optionally, the obtaining the operating frequency of the bidirectional converter according to the given current value and the actual current value includes:
and carrying out proportional integral control on the difference between the current set value and the current actual value to obtain the working frequency.
Optionally, as shown in fig. 4, the determining the driving distribution of the bidirectional converter according to the loop charging and discharging state includes:
and step S401, obtaining the given current value.
And step S402, acquiring the actual current value of the energy storage device.
And S403, obtaining the working frequency of the bidirectional converter according to the given current value and the actual current value.
And S404, generating a primary side driving signal and a secondary side driving signal corresponding to the working frequency according to the charge-discharge state of the loop, and performing driving distribution on the primary side and the secondary side of the bidirectional converter.
In one embodiment, the current actual value of the battery is measured through a measuring tool, the current magnitude of the current of the battery is determined, and then the working frequency required by the battery to reach the preset current under the current working condition is determined according to the difference between the current actual value and the given value of the current, wherein the working frequency is the working frequency of the bidirectional converter. When the current set value is the same as the current actual value, the working state of the battery reaches a preset optimal state, and the bidirectional converter maintains the current working frequency; when the current set value is different from the current actual value, the working current of the battery is over high or over low, and the working frequency of the bidirectional converter needs to be changed according to the actual situation so that the current actual value of the battery leans to the current set value.
When the bidirectional converter is in a charging state, the non-energy storage equipment side arm is distributed as a primary side driving signal, and the energy storage equipment side arm is distributed as a secondary side driving signal; when the bidirectional converter is in a discharging state, the non-energy storage equipment side arm is distributed as a secondary side driving signal, and the energy storage side arm is distributed as a primary side driving signal.
And distributing primary side driving signals and secondary side driving signals of bridge arms at two sides of the bidirectional converter according to the charging and discharging state of the bidirectional converter so as to realize the charging and discharging functions of the circuit.
Optionally, as shown in fig. 3, the determining the charge-discharge state of the loop according to the given current value includes:
and step S301, judging whether the given current value is greater than 0.
Step S302, if the given current value is greater than 0, the bidirectional converter is judged to be in a charging state.
Step S303, if the given current value is less than 0, the bidirectional converter is judged to be in a discharging state.
In one embodiment, a current given value calculated by a battery power given value and a power actual value is obtained, the relationship between the calculated current given value and 0 is judged, if the current given value is a positive number, the bidirectional converter needs to charge electric energy into the battery under the working condition, the current moment of the bidirectional converter is judged to be in a charging state based on the judgment, and then the bidirectional converter is controlled to enable the absolute value of the current actual value to be the same as the current given value as much as possible; if the current set value is a negative number, the bidirectional converter needs to transmit electric energy from the battery to the direct-current bus under the working condition, the current moment of the bidirectional converter is judged to be in a discharging state based on the electric energy, and then the bidirectional converter is controlled to enable the absolute value of the current actual value to be the same as the current set value as much as possible. The positive and negative conditions of the current set value can be calculated according to the self variable in the circuit, namely the actual power value, the working state of the bidirectional converter in the current state can be quickly judged by judging the positive and negative conditions of the current set value, and then the function of quickly switching charging and discharging of the bidirectional converter is realized, so that the bidirectional converter is further maintained stable when participating in primary frequency modulation and secondary frequency modulation on the power generation side.
Optionally, the generating, according to the charge-discharge state of the loop, a corresponding primary side driving signal and a corresponding secondary side driving signal based on the operating frequency, and performing driving distribution on the primary side and the secondary side of the bidirectional converter includes:
and when the charge-discharge state of the loop is a charge state, determining that the bidirectional converter is under a forward LLC working condition, and generating an LLC primary side driving signal and an LLC secondary side driving signal based on the working frequency of the bidirectional converter.
Optionally, the generating, according to the charge-discharge state of the loop, a corresponding primary side driving signal and a corresponding secondary side driving signal based on the operating frequency, and driving and distributing the primary side and the secondary side of the bidirectional converter further includes:
and when the charge-discharge state of the loop is a discharge state, determining that the bidirectional converter generates an SRC primary side driving signal and an SRC secondary side driving signal based on the working frequency of the bidirectional converter under a reverse SRC working condition.
Because the circuit types at two sides of the bidirectional converter are different, when the bidirectional converter is in a charging state, the bidirectional converter is in a forward LLC working condition, namely in an inductor-capacitor LLC working condition; when in the discharging state, the bidirectional converter is in the reverse SRC operating condition, i.e., in the series resonant SRC operating condition. When the driving circuit is in different working conditions, corresponding driving signals need to be determined according to actual working conditions so as to meet charging and discharging requirements. The driving signal is determined by the current working frequency of the bidirectional converter, and the driving signals of the primary side and the secondary side of the two side arms of the bidirectional converter are ensured to be determined based on the current working condition of the bidirectional converter.
An embodiment of the present invention further provides a charge/discharge switching device for a bidirectional converter, including:
the acquisition module is used for acquiring an actual power value and a given power value of the energy storage equipment;
a calculation module for obtaining a given current value of the energy storage device based on the actual power value and the given power value;
the judging module is used for judging the charge and discharge state of the loop according to the current given value;
and the distribution module is used for determining the driving distribution of the bidirectional converter according to the charge and discharge states of the loop.
Another embodiment of the present invention provides a charge/discharge switching device for a bidirectional converter, including a memory and a processor; the memory for storing a computer program; the processor is configured to implement the charge/discharge switching method of the bidirectional converter as described above when executing the computer program.
It should be noted that the apparatus in this embodiment may be a computer device such as an industrial personal computer, a mobile terminal, and the like.
The embodiment of the invention also provides a charge-discharge switching system of the bidirectional converter, which is used for realizing the charge-discharge switching device, the energy storage device and the bidirectional converter of the bidirectional converter;
the charging and discharging switching device of the bidirectional converter is electrically connected with the bidirectional converter, the high-voltage side of the bidirectional converter is electrically connected with the high-voltage bus, and the low-voltage side of the bidirectional converter is electrically connected with the energy storage device;
the bidirectional converter comprises a high-voltage side switch tube group and a low-voltage side switch tube group, the high-voltage side switch tube group comprises at least four switch tubes, and the low-voltage side switch tube group comprises at least four switch tubes.
An electronic device that can be a server or a client of the present invention, which is an example of a hardware device that can be applied to aspects of the present invention, will now be described. Electronic device is intended to represent various forms of digital electronic computer devices, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other suitable computers. The electronic device may also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the inventions described and/or claimed herein.
The electronic device includes a computing unit that can perform various appropriate actions and processes according to a computer program stored in a Read Only Memory (ROM) or a computer program loaded from a storage unit into a Random Access Memory (RAM). In the RAM, various programs and data required for the operation of the device can also be stored. The computing unit, the ROM, and the RAM are connected to each other by a bus. An input/output (I/O) interface is also connected to the bus.
The computer system may include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like. In this application, 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 of the present invention. 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.
Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to be within the scope of the present disclosure.
Claims (10)
1. A charge-discharge switching method of a bidirectional converter is characterized by comprising the following steps:
acquiring an actual power value and a given power value of energy storage equipment;
obtaining a current given value of the energy storage device based on the power actual value and the power given value;
judging the charge-discharge state of the loop according to the current given value;
and determining the driving distribution of the bidirectional converter according to the loop charging and discharging states.
2. The method according to claim 1, wherein determining the driving distribution of the bidirectional converter according to the loop charging/discharging state comprises:
acquiring an actual current value of the energy storage device;
obtaining the working frequency of the bidirectional converter according to the given current value and the actual current value;
and generating a primary side driving signal and a secondary side driving signal based on the working frequency according to the charge-discharge state of the loop, and performing driving distribution on the primary side and the secondary side of the bidirectional converter.
3. The charge-discharge switching method of the bidirectional converter according to claim 2, wherein said determining the loop charge-discharge state according to the given current value comprises:
judging whether the given current value is greater than 0;
if the given current value is greater than 0, judging that the bidirectional converter is in a charging state;
and if the given current value is less than 0, judging that the bidirectional converter is in a discharging state.
4. The method according to claim 3, wherein the generating a primary side driving signal and a secondary side driving signal corresponding to the operating frequency according to the loop charging/discharging state, and performing driving distribution on the primary side and the secondary side of the bidirectional converter comprises:
and when the charge-discharge state of the loop is a charge state, determining that the bidirectional converter is under a forward LLC working condition, and generating an LLC primary side driving signal and an LLC secondary side driving signal based on the working frequency of the bidirectional converter.
5. The method according to claim 3, wherein the generating a primary side driving signal and a secondary side driving signal based on the operating frequency according to the loop charging/discharging state, and performing driving distribution on the primary side and the secondary side of the bidirectional converter further comprises:
and when the charge-discharge state of the loop is a discharge state, determining that the bidirectional converter generates an SRC primary side driving signal and an SRC secondary side driving signal based on the working frequency of the bidirectional converter under a reverse SRC working condition.
6. The charge-discharge switching method of the bidirectional converter according to claim 1, wherein the obtaining the given current value of the energy storage device based on the actual power value and the given power value comprises:
and carrying out proportional integral control on the difference between the given power value and the actual power value to obtain the given current value.
7. The charge-discharge switching method of the bidirectional converter according to claim 2, wherein the obtaining the operating frequency of the bidirectional converter according to the given current value and the actual current value comprises:
and carrying out proportional integral control on the difference between the current set value and the current actual value to obtain the working frequency.
8. A charge-discharge switching device of a bidirectional converter, comprising:
the acquisition module is used for acquiring an actual power value and a given power value of the energy storage equipment;
a calculation module for obtaining a given current value of the energy storage device based on the actual power value and the given power value;
the judging module is used for judging the charge and discharge state of the loop according to the current given value;
and the distribution module is used for determining the driving distribution of the bidirectional converter according to the charge and discharge states of the loop.
9. The charge-discharge switching device of the bidirectional converter is characterized by comprising a memory and a processor;
the memory for storing a computer program;
the processor is configured to implement the charge/discharge switching method of the bidirectional converter according to any one of claims 1 to 7 when executing the computer program.
10. A charge-discharge switching system of a bidirectional converter, comprising the charge-discharge switching device of the bidirectional converter according to claim 9, and an energy storage device, the bidirectional converter;
the charging and discharging switching device of the bidirectional converter is electrically connected with the bidirectional converter, the high-voltage side of the bidirectional converter is electrically connected with the high-voltage bus, and the low-voltage side of the bidirectional converter is electrically connected with the energy storage device;
the bidirectional converter comprises a high-voltage side switch tube group and a low-voltage side switch tube group, the high-voltage side switch tube group comprises at least four switch tubes, and the low-voltage side switch tube group comprises at least four switch tubes.
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