Current control method and device of energy storage converter, storage medium and electronic equipment

Abstract

The invention relates to a current control method and device of an energy storage converter, a storage medium and electronic equipment, and the method comprises the steps: determining a rated DC impedance value of the energy storage converter through a rated current value and a rated voltage value of the energy storage converter under a rated working condition; obtaining a direct-current value and a direct-current voltage value of the energy storage converter, and determining a direct-current impedance value of the energy storage converter through the direct-current value and the direct-current voltage value; and adjusting a proportionality coefficient and an integral coefficient of a proportional-integral controller of the energy storage converter according to the direct-current impedance value and the rated direct-current impedance value, and controlling the output of a PWM actuator of the energy storage converter according to the adjusted proportionality coefficient and integral coefficient. According to the technical scheme, the proportionality coefficient and the integral coefficient of the proportional-integral controller are adjusted according to the obtained rated direct-current impedance value and the obtained direct-current impedance value, then output of the PWM actuator of the energy storage converter is controlled, control parameters can be optimized in real time, the output response speed of equipment can be increased, and instantaneous power fluctuation of the equipment can be reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of energy storage systems, and in particular to a current control method, device, storage medium and electronic equipment for an energy storage converter. Background Art

[0002] In the prior art, the power control of the energy storage inverter is based on the design parameters of the energy storage inverter itself. The equivalent impedance of the DC side during rated operation is calculated through the parameters, and the current control parameters of the equipment under different working conditions are adjusted in real time based on this parameter. Although this method can eliminate transient fluctuations in the output voltage, it is difficult to calculate the system line impedance. It is necessary to add voltage and current acquisition circuits at the source end of the power grid, and the equivalent impedance characteristics of the DC side are not taken into account. For the control of multi-level topology energy storage inverters, it is easy to cause fluctuations in the DC side bus, which is a technical problem that urgently needs to be solved. Summary of the invention

[0003] In order to overcome the problems existing in the related art, the present disclosure provides a current control method, device, storage medium and electronic equipment of an energy storage converter.

[0004] According to a first aspect of an embodiment of the present disclosure, a current control method for an energy storage converter is provided, comprising:

[0005] Determining the rated DC impedance value of the energy storage converter according to the rated current value and the rated voltage value of the energy storage converter under rated operating conditions;

[0006] Obtaining a DC current value and a DC voltage value of the energy storage converter, and determining a DC impedance value of the energy storage converter according to the DC current value and the DC voltage value;

[0007] The proportional coefficient and the integral coefficient of the proportional-integral controller of the energy storage converter are adjusted by the DC impedance value and the rated DC impedance value, and the output of the PWM actuator of the energy storage converter is controlled by the adjusted proportional coefficient and integral coefficient.

[0008] Optionally, adjusting a proportional coefficient and an integral coefficient of a proportional-integral controller of the energy storage converter by using the DC impedance value and the rated DC impedance value, and controlling an output of a PWM actuator of the energy storage converter by using the adjusted proportional coefficient and integral coefficient, comprises:

[0009] Determining the impedance adjustment coefficient of the energy storage converter by using the DC impedance value and the rated DC impedance value;

[0010] The proportional coefficient and the integral coefficient of the proportional-integral controller of the energy storage converter are adjusted based on the impedance adjustment coefficient, and the output of the PWM actuator of the energy storage converter is controlled by the adjusted proportional coefficient and the integral coefficient.

[0011] Optionally, determining the rated DC impedance value of the energy storage converter by using the rated current value and the rated voltage value of the energy storage converter under rated operating conditions includes:

[0012] Determining the rated current value and the rated voltage value according to the rated operating condition of the energy storage converter;

[0013] A ratio of the rated voltage value to the rated current value is obtained as the rated DC impedance value.

[0014] Optionally, the acquiring a DC current value and a DC voltage value of the energy storage converter, and determining a DC impedance value of the energy storage converter according to the DC current value and the DC voltage value, includes:

[0015] When the energy storage converter is in operation, obtaining the DC current value and the DC voltage value of the DC side of the energy storage converter;

[0016] The DC impedance value of the energy storage converter is obtained by acquiring the ratio of the DC voltage value to the DC current value.

[0017] Optionally, determining the impedance adjustment coefficient of the energy storage converter by using the DC impedance value and the rated DC impedance value includes:

[0018] A ratio of the DC impedance value to the rated DC impedance value is obtained as an impedance adjustment coefficient of the energy storage converter.

[0019] Optionally, adjusting a proportional coefficient and an integral coefficient of a proportional-integral controller of the energy storage converter based on the impedance adjustment coefficient, and controlling the output of a PWM actuator of the energy storage converter by means of the adjusted proportional coefficient and integral coefficient, comprises:

[0020] The proportional coefficient of the energy storage converter adjusted by the proportional-integral controller is obtained by multiplying the preset proportional coefficient of the energy storage converter under the rated working condition by the impedance adjustment coefficient;

[0021] Determine the integral coefficient of the energy storage converter adjusted by the proportional-integral controller by multiplying the preset integral coefficient of the energy storage converter under the rated working condition by the impedance adjustment coefficient;

[0022] The output of the PWM actuator of the energy storage converter is controlled by the adjusted proportional coefficient and integral coefficient.

[0023] Optionally, controlling the output of the PWM actuator of the energy storage converter by using the adjusted proportional coefficient and integral coefficient includes:

[0024] When the energy storage converter is a single-stage topology, the PWM actuator corresponds to the AC side switch device of the energy storage converter, and controls the energy storage converter PWM actuator to execute the AC side output through the proportional-integral controller based on the adjusted proportional coefficient and integral coefficient;

[0025] When the energy storage converter is a two-stage topology, the PWM actuator corresponds to the DC side switch device of the energy storage converter, and controls the energy storage converter PWM actuator to execute DC side output through the proportional-integral controller based on the adjusted proportional coefficient and integral coefficient.

[0026] According to a second aspect of an embodiment of the present disclosure, a current control device of an energy storage converter is provided, comprising:

[0027] A first impedance determination module, used to determine a rated DC impedance value of the energy storage converter according to a rated current value and a rated voltage value of the energy storage converter under rated operating conditions;

[0028] A second impedance determination module is used to obtain a DC current value and a DC voltage value of the energy storage converter, and determine a DC impedance value of the energy storage converter according to the DC current value and the DC voltage value;

[0029] The control module is used to adjust the proportional coefficient and integral coefficient of the proportional-integral controller of the energy storage converter according to the DC impedance value and the rated DC impedance value, and control the output of the PWM actuator of the energy storage converter according to the adjusted proportional coefficient and integral coefficient.

[0030] According to a third aspect of an embodiment of the present disclosure, a non-temporary computer-readable storage medium is provided, on which a computer program is stored, and when the program is executed by a processor, the steps of the current control method of the energy storage converter provided in the first aspect of the present disclosure are implemented.

[0031] According to a fourth aspect of an embodiment of the present disclosure, there is provided an electronic device, including:

[0032] a memory having a computer program stored thereon;

[0033] A processor is used to execute the computer program in the memory to implement the steps of the current control method of the energy storage converter provided in the first aspect of the present disclosure.

[0034] The technical solution provided by the embodiments of the present disclosure may have the following beneficial effects:

[0035] In the above technical scheme, the rated DC impedance value of the energy storage converter is determined by the rated current value and the rated voltage value of the energy storage converter under the rated working condition; the DC current value and the DC voltage value of the energy storage converter are obtained, and the DC impedance value of the energy storage converter is determined by the DC current value and the DC voltage value; the proportional coefficient and the integral coefficient of the proportional-integral controller of the energy storage converter are adjusted by the DC impedance value and the rated DC impedance value, and the output of the PWM actuator of the energy storage converter is controlled by the adjusted proportional coefficient and the integral coefficient. Through the above technical scheme, the rated DC impedance value obtained by the rated current value and the rated voltage value of the energy storage converter under the rated working condition and the DC impedance value obtained by the DC current value and the DC voltage value of the energy storage converter are adjusted to adjust the proportional coefficient and the integral coefficient of the proportional-integral controller of the energy storage converter, thereby controlling the output of the PWM actuator of the energy storage converter, which can not only optimize the control parameters in real time, but also improve the speed of the output response of the equipment. For the control of the energy storage converter with multi-level topology, the fluctuation of the instantaneous power of the equipment can be reduced, and it is suitable for a variety of energy storage converter control strategies.

[0036] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0038] Figure 1 The figure is a flow chart of a current control method of an energy storage converter according to an exemplary embodiment.

[0039] Figure 2 The figure is a flow chart of another current control method of an energy storage converter according to an exemplary embodiment.

[0040] Figure 3 The figure is a flow chart of another current control method of an energy storage converter according to an exemplary embodiment.

[0041] Figure 4 The figure is a flow chart of another current control method of an energy storage converter according to an exemplary embodiment.

[0042] Figure 5 is a flow chart of yet another current control method for an energy storage converter according to an exemplary embodiment.

[0043] Figure 6is a flow chart of yet another current control method for an energy storage converter according to an exemplary embodiment.

[0044] Figure 7 is a block diagram of a current control device 700 of an energy storage converter according to an exemplary embodiment.

[0045] Figure 8 It is a block diagram of an algorithm flow chart of a current control method for an energy storage converter according to an exemplary embodiment.

[0046] Fig. 9 is a block diagram of an electronic device 900 according to an exemplary embodiment. DETAILED DESCRIPTION

[0047] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0048] It is understood that the terms "first", "second", etc. in the present disclosure are used to describe various information, but these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other, and do not indicate a specific order or importance.

[0049] It is further understood that, although the operations are described in a specific order in the drawings in the embodiments of the present disclosure, it should not be understood as requiring the operations to be performed in the specific order shown or in a serial order, or requiring the execution of all the operations shown to obtain the desired results. In certain environments, multitasking and parallel processing may be advantageous.

[0050] Figure 1 is a flow chart of a current control method for an energy storage converter according to an exemplary embodiment. Figure 1 As shown, including:

[0051] In step S11, the rated DC impedance value of the energy storage converter is determined by the rated current value and the rated voltage value of the energy storage converter under the rated working condition.

[0052] In step S12, a DC current value and a DC voltage value of the energy storage converter are obtained, and a DC impedance value of the energy storage converter is determined through the DC current value and the DC voltage value.

[0053] Exemplarily, the energy storage converter (Power Conversion System) can control the charging and discharging process of the battery, perform AC / DC conversion, and can directly supply power to the AC load in the absence of a power grid. The energy storage converter is composed of a DC / AC (Direct Current / Alternating Current) bidirectional converter, a PWM actuator, etc., and controls the converter to charge or discharge the battery according to the sign and size of the power instruction by receiving background control instructions, thereby realizing the regulation of the active power and reactive power of the power grid. The corresponding circuit switching device on the AC side of the energy storage converter is a DC / AC switching device, and the corresponding current switching device on the DC side of the energy storage converter is a DC / DC switching device. According to the circuit topology of the energy storage converter, the corresponding circuit switching device when the PWM actuator of the energy storage converter executes the output is determined.

[0054] The energy storage converter is powered on, the control line of the energy storage converter is energized, and the rated DC impedance value of the energy storage converter under rated operation is calculated according to the rated current value and the rated voltage value under the rated working condition designed for the energy storage converter, the energy storage converter is started to operate, the DC current value and the DC voltage value on the DC side are collected in real time, and the DC impedance value of the energy storage converter is calculated through the DC current value and the DC voltage value. For example: according to the rated voltage value Uebat and the rated current value Iebat under the rated working condition designed for the energy storage converter, the rated DC impedance value Zebat under rated working condition operation is calculated, the energy storage converter is started to operate, the DC voltage value Ubat and the DC current value Ibat on the DC side are collected in real time, and the DC impedance value Zbat on the DC side is calculated.

[0055] In step S13, the proportional coefficient and the integral coefficient of the proportional-integral controller of the energy storage converter are adjusted by the DC impedance value and the rated DC impedance value, and the output of the PWM actuator of the energy storage converter is controlled by the adjusted proportional coefficient and integral coefficient.

[0056] Exemplarily, a proportional coefficient and an integral coefficient are pre-set in the proportional-integral controller, and the ratio of the calculated DC impedance value to the rated DC impedance value is calculated to obtain an impedance adjustment coefficient, and the proportional coefficient and the integral coefficient of the proportional-integral controller of the energy storage converter are adjusted by the impedance adjustment coefficient, and the updated proportional coefficient and the integral coefficient are recorded in the proportional-integral controller to control the output of the PWM (Pulse Width Modulation) actuator of the energy storage converter. For example: the ratio of the DC impedance value to the rated DC impedance value is used as the impedance adjustment coefficient Ratio, and the proportional coefficient and the integral coefficient of the proportional-integral controller are adjusted according to the impedance adjustment coefficient Ratio, and the adjusted proportional coefficient and the integral coefficient are recorded in the proportional-integral controller to control the output of the PWM actuator of the energy storage converter according to the adjusted proportional coefficient and the integral coefficient.

[0057] Through the above technical scheme, the proportional coefficient and integral coefficient of the proportional-integral controller of the energy storage converter are adjusted by the rated DC impedance value obtained by the rated current value and rated voltage value of the energy storage converter under rated operating conditions and the DC impedance value obtained by the DC current value and DC voltage value of the energy storage converter. The output of the PWM actuator of the energy storage converter is controlled by the adjusted proportional coefficient and integral coefficient, which can not only realize real-time optimization of control parameters, but also improve the speed of equipment output response. For the energy storage converter control of multi-level topology, the fluctuation of equipment instantaneous power can also be reduced.

[0058] Figure 2 is a flow chart showing another current control method of an energy storage converter according to an exemplary embodiment. Figure 2 As shown, step S13 includes:

[0059] In step S131, the impedance adjustment coefficient of the energy storage converter is determined by the DC impedance value and the rated DC impedance value.

[0060] Exemplarily, the energy storage converter is powered on, the control line of the energy storage converter is energized, and based on the calculated DC impedance value and the rated DC impedance value, the ratio of the DC impedance value to the rated DC impedance value is used as the impedance adjustment coefficient of the energy storage converter.

[0061] For example: According to the rated voltage value Uebat and the rated current value Iebat under the rated operating conditions of the energy storage inverter, the rated DC impedance value Zebat=Uebat / Iebat under rated operating conditions is calculated, and according to the real-time collected DC voltage value Ubat and DC current value Ibat, the DC impedance value Zbat=Ubat / Ibat on the DC side is calculated, and the ratio of the DC impedance value to the rated DC impedance value is obtained to obtain the impedance adjustment coefficient Ratio=Zbat / Zebat.

[0062] In step S132, the proportional coefficient and the integral coefficient of the proportional-integral controller of the energy storage converter are adjusted based on the impedance adjustment coefficient, and the output of the PWM actuator of the energy storage converter is controlled by the adjusted proportional coefficient and integral coefficient.

[0063] Exemplarily, a proportional coefficient and an integral coefficient are pre-set in the proportional-integral controller, the impedance adjustment coefficient of the energy storage inverter is multiplied by the proportional coefficient of the pre-set proportional-integral controller to obtain an updated proportional coefficient, the impedance adjustment coefficient of the energy storage inverter is multiplied by the integral coefficient of the pre-set proportional-integral controller to obtain an updated integral coefficient, and the output of the PWM actuator of the energy storage inverter is controlled according to the updated proportional coefficient and the updated integral coefficient, wherein the PWM actuator refers to a method of digitally encoding an analog signal level by using the digital output of a microprocessor in the energy storage inverter to control an analog circuit, and can greatly reduce the cost and power consumption of the system by digitally controlling the analog circuit. For example: the preset proportional coefficient is Kp, the preset integral coefficient is Ki, the proportional coefficient and the integral coefficient are adjusted according to the impedance adjustment coefficient, the adjusted proportional coefficient is Kp_bat'=Kp*Ratio, the adjusted integral coefficient is Ki_bat'=Ki*Ratio, the adjusted proportional coefficient Kp_bat' and the adjusted integral coefficient Ki_bat' are recorded in the proportional-integral controller to control the output of the PWM actuator of the energy storage inverter.

[0064] Optionally, in step S131, it includes:

[0065] The ratio of the DC impedance value to the rated DC impedance value is obtained as the impedance adjustment coefficient of the energy storage converter.

[0066] Exemplarily, the ratio of the DC impedance value to the rated DC impedance value is used as the impedance adjustment coefficient of the energy storage converter. For example, the ratio of the DC impedance value Zbat to the rated DC impedance value Zebat is recorded as Ratio, and the impedance adjustment coefficient Ratio=Zbat / Zebat is obtained.

[0067] Figure 3is a flow chart showing another current control method of an energy storage converter according to an exemplary embodiment. Figure 3 As shown, step S12 includes:

[0068] In step S121, the rated current value and the rated voltage value are determined according to the rated operating conditions of the energy storage converter.

[0069] In step S122, a ratio of the rated voltage value to the rated current value is obtained as the rated DC impedance value.

[0070] Exemplarily, according to the rated current value and the rated voltage value under the rated working condition of the energy storage converter, the ratio of the rated voltage value to the rated current value is used as the rated DC impedance value of the energy storage converter under rated operation. For example, the ratio of the rated voltage value Uebat to the rated current value Iebat is calculated to obtain the rated DC impedance value Zebat=Uebat / Iebat.

[0071] Figure 4 is a flow chart showing another current control method of an energy storage converter according to an exemplary embodiment. Figure 4 As shown, step S12 also includes:

[0072] In step S123, when the energy storage converter is in operation, the DC current value and the DC voltage value of the DC side of the energy storage converter are obtained.

[0073] In step S124, the DC impedance value of the energy storage converter is obtained by acquiring the ratio of the DC voltage value to the DC current value.

[0074] Exemplarily, the energy storage controller device is started and operated, and the DC current value and the DC voltage value of the DC side of the energy storage converter are collected in real time, and the DC impedance value of the energy storage converter is determined by the ratio of the DC current value and the DC voltage value. For example: according to the real-time collected DC voltage value Ubat and DC current value Ibat, the ratio of the DC voltage value Ubat and the DC current value Ibat is used as the DC impedance value Zbat=Ubat / Ibat of the DC side.

[0075] Figure 5 is a flow chart of another current control method of an energy storage converter according to an exemplary embodiment. Figure 5 As shown, step S132 includes:

[0076] In step S1321, the preset proportional coefficient of the energy storage converter under the rated working condition is multiplied by the impedance adjustment coefficient to obtain the proportional coefficient of the energy storage converter adjusted by the proportional-integral controller.

[0077] In step S1322, the integral coefficient adjusted by the proportional-integral controller of the energy storage converter is determined by multiplying the preset integral coefficient of the energy storage converter under the rated working condition by the impedance adjustment coefficient.

[0078] In step S1323, the output of the PWM actuator of the energy storage converter is controlled by the adjusted proportional coefficient and integral coefficient.

[0079] Exemplarily, a proportional coefficient and an integral coefficient are pre-set in the proportional-integral controller, the impedance adjustment coefficient of the energy storage converter is multiplied by the proportional coefficient of the pre-set proportional-integral controller to obtain an updated proportional coefficient, the preset integral coefficient of the energy storage converter under the rated working condition is multiplied by the impedance adjustment coefficient, the integral coefficient adjusted by the proportional-integral controller of the energy storage converter is determined, the adjusted proportional coefficient and integral coefficient are recorded in the proportional-integral controller, and the output of the PWM actuator of the energy storage converter is controlled by the adjusted proportional coefficient and integral coefficient. For example: the preset proportional coefficient is Kp, the preset integral coefficient is Ki, the proportional coefficient and the integral coefficient are adjusted according to the impedance adjustment coefficient, the impedance adjustment coefficient is multiplied by the proportional coefficient to obtain the adjusted proportional coefficient Kp_bat'=Kp*Ratio, the impedance adjustment coefficient is multiplied by the integral coefficient to obtain the adjusted integral coefficient Ki_bat'=Ki*Ratio, the adjusted proportional coefficient Kp_bat' and the adjusted integral coefficient Ki_bat' are recorded in the proportional-integral controller to control the output of the PWM actuator of the energy storage converter.

[0080] Figure 6 is a flow chart of another current control method of an energy storage converter according to an exemplary embodiment. Figure 6 As shown, in step S1323, it includes:

[0081] In step S13231, when the energy storage converter is a single-stage topology, the PWM actuator corresponds to the AC side switch device of the energy storage converter, and controls the energy storage converter PWM actuator to execute the AC side output through the proportional-integral controller based on the adjusted proportional coefficient and integral coefficient.

[0082] In step S13232, when the energy storage converter is a two-stage topology, the PWM actuator corresponds to the DC side switch device of the energy storage converter, and controls the energy storage converter PWM actuator to execute the DC side output through the proportional-integral controller based on the adjusted proportional coefficient and integral coefficient.

[0083] Exemplarily, the energy storage controller can be a single-stage topology or a multi-stage topology. The single-stage topology refers to a structure in which all devices in the energy storage converter share a switching circuit. The two-stage topology refers to a structure in which all devices in the energy storage converter are divided into two levels or layers, that is, a structure with two switching circuits. The multi-stage topology refers to a topological structure in which the circuits in the energy storage converter are divided into multiple levels or layers. When the energy storage converter is a single-stage DC / AC topology, the PWM actuator corresponds to the DC / AC switching device on the AC side of the energy storage converter. Based on the adjusted proportional coefficient and integral coefficient, the proportional-integral controller controls the PWM actuator of the energy storage converter to execute the AC side output. When the energy storage converter is a two-stage DC / DC+DC / AC topology, the PWM actuator corresponds to the DC / DC switching device on the DC side of the energy storage converter. Based on the adjusted proportional coefficient and integral coefficient, the proportional-integral controller controls the PWM actuator of the energy storage converter to execute the DC side output. For the control of energy storage converters with multi-stage topologies, the instantaneous power fluctuations of the equipment can be reduced, and a variety of energy storage converter control strategies can be adapted.

[0084] In the above technical scheme, the rated DC impedance value of the energy storage converter is determined by the rated current value and rated voltage value of the energy storage converter under rated working conditions; the DC current value and DC voltage value of the energy storage converter are obtained, and the DC impedance value of the energy storage converter is determined by the DC current value and DC voltage value; the proportional coefficient and integral coefficient of the proportional-integral controller of the energy storage converter are adjusted by the DC impedance value and the rated DC impedance value, and the output of the PWM actuator of the energy storage converter is controlled by the adjusted proportional coefficient and integral coefficient. The proportional coefficient and integral coefficient of the proportional-integral controller of the energy storage converter are adjusted by the rated DC impedance value and DC impedance value of the energy storage converter under rated working conditions, and then the output of the PWM actuator of the energy storage converter is controlled, so as to realize real-time optimization of control parameters, improve the speed of equipment output response, and reduce the fluctuation of equipment instantaneous power.

[0085] Figure 7 is a block diagram of a current control device 700 for an energy storage converter according to an exemplary embodiment. Figure 7 As shown, the current control device 700 of the energy storage converter includes: a first impedance determination module 701 , a second impedance determination module 702 and a control module 703 .

[0086] A first impedance determination module 701, used to determine the rated DC impedance value of the energy storage converter according to the rated current value and the rated voltage value of the energy storage converter under rated working conditions;

[0087] The second impedance determination module 702 is used to obtain the DC current value and the DC voltage value of the energy storage converter, and determine the DC impedance value of the energy storage converter according to the DC current value and the DC voltage value;

[0088] The control module 703 is used to adjust the proportional coefficient and integral coefficient of the proportional-integral controller of the energy storage converter according to the DC impedance value and the rated DC impedance value, and control the output of the PWM actuator of the energy storage converter according to the adjusted proportional coefficient and integral coefficient.

[0089] Optionally, the control module 703 includes:

[0090] A coefficient determination submodule, used to determine the impedance adjustment coefficient of the energy storage converter according to the DC impedance value and the rated DC impedance value;

[0091] The control submodule is used to adjust the proportional coefficient and integral coefficient of the proportional-integral controller of the energy storage converter based on the impedance adjustment coefficient, and control the output of the PWM actuator of the energy storage converter through the adjusted proportional coefficient and integral coefficient.

[0092] Optionally, the coefficient determination submodule is used to:

[0093] A ratio of the DC impedance value to the rated DC impedance value is obtained as an impedance adjustment coefficient of the energy storage converter.

[0094] Optionally, the first impedance determination module 701 includes:

[0095] A voltage determination submodule, used to determine the rated current value and the rated voltage value according to the rated operating condition of the energy storage converter;

[0096] The first impedance determination submodule is used to obtain a ratio of the rated voltage value to the rated current value as the rated DC impedance value.

[0097] Optionally, the second impedance determination module 702 includes:

[0098] An acquisition submodule, used for acquiring the DC current value and the DC voltage value of the DC side of the energy storage converter when the energy storage converter is in operation;

[0099] The second impedance determination submodule is used to obtain the DC impedance value of the energy storage converter by acquiring the ratio of the DC voltage value to the DC current value.

[0100] Optionally, the control submodule is used to:

[0101] The proportional coefficient of the energy storage converter adjusted by the proportional-integral controller is obtained by multiplying the preset proportional coefficient of the energy storage converter under the rated working condition by the impedance adjustment coefficient;

[0102] Determine the integral coefficient of the energy storage converter adjusted by the proportional-integral controller by multiplying the preset integral coefficient of the energy storage converter under the rated working condition by the impedance adjustment coefficient;

[0103] The output of the PWM actuator of the energy storage converter is controlled by the adjusted proportional coefficient and integral coefficient.

[0104] Optionally, the control submodule is used to:

[0105] When the energy storage converter is a single-stage topology, the PWM actuator corresponds to the AC side switch device of the energy storage converter, and controls the energy storage converter PWM actuator to execute the AC side output through the proportional-integral controller based on the adjusted proportional coefficient and integral coefficient;

[0106] When the energy storage converter is a two-stage topology, the PWM actuator corresponds to the DC side switch device of the energy storage converter, and controls the energy storage converter PWM actuator to execute the DC side output through the proportional-integral controller based on the adjusted proportional coefficient and integral coefficient.

[0107] Figure 8 is a block diagram of an algorithm flow chart of a current control method for an energy storage converter according to an exemplary embodiment. Figure 8 As shown, after the energy storage converter is powered on, the proportional coefficient Kp and the integral coefficient Ki are pre-set in the proportional-integral controller, the energy storage converter is started, the input current is I, the real-time DC voltage value Ubat and DC current value Ibat of the energy storage converter are obtained, the ratio of the DC voltage value Ubat to the DC current value Ibat is used as the DC impedance value Zbat=Ubat / Ibat of the DC side, the ratio of the DC impedance value Zbat to the rated DC impedance value Zebat is used as the impedance adjustment coefficient Ratio=Zbat / Zebat, the impedance adjustment coefficient is multiplied by the proportional coefficient to obtain the adjusted proportional coefficient Kp_bat'=Kp*Ratio, the impedance adjustment coefficient is multiplied by the integral coefficient to obtain the adjusted integral coefficient Ki_bat'=Ki*Ratio, the adjusted proportional coefficient Kp_bat' and the adjusted integral coefficient Ki_bat' are recorded in the proportional-integral controller to control the output of the PWM actuator of the energy storage converter.

[0108] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0109] Fig. 9 FIG. 9 is a block diagram of an electronic device 900 according to an exemplary embodiment. Fig. 9 As shown, the electronic device 900 may include: a processor 901 and a memory 902. The electronic device 900 may also include one or more of a multimedia component 903, an input / output (I / O) interface 904, and a communication component 905.

[0110] The processor 901 is used to control the overall operation of the electronic device 900 to complete all or part of the steps in the current control method of the energy storage converter. The memory 902 is used to store various types of data to support the operation of the electronic device 900. For example, these data may include instructions for any application or method used to operate on the electronic device 900, and application-related data, such as contact data, sent and received messages, pictures, audio, video, etc. The memory 902 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (Static Random Access Memory, referred to as SRAM), electrically erasable programmable read-only memory (Electrically Erasable Programmable Read-Only Memory, referred to as EEPROM), erasable programmable read-only memory (Erasable Programmable Read-Only Memory, referred to as EPROM), programmable read-only memory (Programmable Read-Only Memory, referred to as PROM), read-only memory (Read-Only Memory, referred to as ROM), magnetic memory, flash memory, disk or optical disk. The multimedia component 903 may include a screen and an audio component. The screen may be, for example, a touch screen, and the audio component is used to output and / or input audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signal may be further stored in the memory 902 or sent through the communication component 905. The audio component also includes at least one speaker for outputting audio signals. The I / O interface 904 provides an interface between the processor 901 and other interface modules, and the other interface modules may be keyboards, mice, buttons, etc. These buttons may be virtual buttons or physical buttons. The communication component 905 is used for wired or wireless communication between the electronic device 900 and other devices. Wireless communication, such as Wi-Fi, Bluetooth, Near Field Communication (NFC), 2G, 3G, 4G, NB-IOT, eMTC, or other 5G, etc., or a combination of one or more of them, is not limited here. Therefore, the corresponding communication component 905 may include: Wi-Fi module, Bluetooth module, NFC module, etc.

[0111] In an exemplary embodiment, the electronic device 900 can be implemented by one or more application specific integrated circuits (ASIC), digital signal processors (DSP), digital signal processing devices (DSPD), programmable logic devices (PLD), field programmable gate arrays (FPGA), controllers, microcontrollers, microprocessors or other electronic components to execute the above-mentioned current control method of the energy storage inverter.

[0112] In another exemplary embodiment, a computer-readable storage medium including program instructions is also provided, and when the program instructions are executed by a processor, the steps of the current control method of the energy storage converter are implemented. For example, the computer-readable storage medium can be the memory 902 including the program instructions, and the program instructions can be executed by the processor 901 of the electronic device 900 to complete the current control method of the energy storage converter.

[0113] In addition to being implemented by the above-mentioned electronic devices, the current control method of the energy storage converter can also be executed by other forms of hardware devices. For example, in one embodiment, the device can be an integrated circuit (IC) or a chip, wherein the integrated circuit can be an IC or a collection of multiple ICs; the chip can include but is not limited to the following types: GPU (Graphics Processing Unit), CPU (Central Processing Unit), FPGA (Field Programmable Gate Array), DSP (Digital Signal Processor), ASIC (Application Specific Integrated Circuit), SOC (System on Chip, SoC, system on chip or system-level chip), etc. The above-mentioned integrated circuit or chip can be used to execute executable instructions (or codes) to implement the current control method of the energy storage converter. The executable instructions can be stored in the integrated circuit or chip, or can be obtained from other devices or equipment, such as the integrated circuit or chip including a processor, a memory, and an interface for communicating with other devices. The executable instruction can be stored in the memory, and when the executable instruction is executed by the processor, the above-mentioned current control method of the energy storage converter can be implemented; alternatively, the integrated circuit or chip can receive the executable instruction through the interface and transmit it to the processor for execution, so as to implement the above-mentioned current control method of the energy storage converter.

[0114] In another exemplary embodiment, a computer program product is further provided. The computer program product includes a computer program executable by a programmable device. The computer program has a code portion for executing the current control method of the energy storage converter when executed by the programmable device.

[0115] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0116] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0117] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A current control method for an energy storage converter, characterized in that: include: Determining the rated DC impedance value of the energy storage converter according to the rated current value and the rated voltage value of the energy storage converter under rated operating conditions; Obtaining a DC current value and a DC voltage value of the energy storage converter, and determining a DC impedance value of the energy storage converter according to the DC current value and the DC voltage value; The proportional coefficient and the integral coefficient of the proportional-integral controller of the energy storage converter are adjusted by the DC impedance value and the rated DC impedance value, and the output of the PWM actuator of the energy storage converter is controlled by the adjusted proportional coefficient and integral coefficient.

2. The method according to claim 1, characterized in that The method of adjusting the proportional coefficient and the integral coefficient of the proportional-integral controller of the energy storage converter by using the DC impedance value and the rated DC impedance value, and controlling the output of the PWM actuator of the energy storage converter by using the adjusted proportional coefficient and the integral coefficient, comprises: Determining the impedance adjustment coefficient of the energy storage converter by using the DC impedance value and the rated DC impedance value; The proportional coefficient and the integral coefficient of the proportional-integral controller of the energy storage converter are adjusted based on the impedance adjustment coefficient, and the output of the PWM actuator of the energy storage converter is controlled by the adjusted proportional coefficient and the integral coefficient.

3. The method according to claim 1 or 2, characterized in that: Determining the rated DC impedance value of the energy storage converter by the rated current value and the rated voltage value of the energy storage converter under rated working conditions includes: Determining the rated current value and the rated voltage value according to the rated operating condition of the energy storage converter; A ratio of the rated voltage value to the rated current value is obtained as the rated DC impedance value.

4. The method according to claim 1 or 2, characterized in that: The step of obtaining a DC current value and a DC voltage value of the energy storage converter, and determining a DC impedance value of the energy storage converter according to the DC current value and the DC voltage value, comprises: When the energy storage converter is in operation, obtaining the DC current value and the DC voltage value of the DC side of the energy storage converter; The DC impedance value of the energy storage converter is obtained by acquiring the ratio of the DC voltage value to the DC current value.

5. The method according to claim 2, characterized in that: The step of determining the impedance adjustment coefficient of the energy storage converter by using the DC impedance value and the rated DC impedance value includes: A ratio of the DC impedance value to the rated DC impedance value is obtained as an impedance adjustment coefficient of the energy storage converter.

6. The method according to claim 2, characterized in that The method of adjusting the proportional coefficient and the integral coefficient of the proportional-integral controller of the energy storage converter based on the impedance adjustment coefficient, and controlling the output of the PWM actuator of the energy storage converter by the adjusted proportional coefficient and the integral coefficient, comprises: The proportional coefficient of the energy storage converter adjusted by the proportional-integral controller is obtained by multiplying the preset proportional coefficient of the energy storage converter under the rated working condition by the impedance adjustment coefficient; Determine the integral coefficient of the energy storage converter adjusted by the proportional-integral controller by multiplying the preset integral coefficient of the energy storage converter under the rated working condition by the impedance adjustment coefficient; The output of the PWM actuator of the energy storage converter is controlled by the adjusted proportional coefficient and integral coefficient.

7. The method according to claim 6, characterized in that The step of controlling the output of the PWM actuator of the energy storage converter by using the adjusted proportional coefficient and integral coefficient comprises: When the energy storage converter is a single-stage topology, the PWM actuator corresponds to the AC side switch device of the energy storage converter, and controls the energy storage converter PWM actuator to execute the AC side output through the proportional-integral controller based on the adjusted proportional coefficient and integral coefficient; When the energy storage converter is a two-stage topology, the PWM actuator corresponds to the DC side switch device of the energy storage converter, and controls the energy storage converter PWM actuator to execute DC side output through the proportional-integral controller based on the adjusted proportional coefficient and integral coefficient.

8. A current control device for an energy storage converter, characterized in that: include: A first impedance determination module, used to determine a rated DC impedance value of the energy storage converter according to a rated current value and a rated voltage value of the energy storage converter under rated operating conditions; A second impedance determination module is used to obtain a DC current value and a DC voltage value of the energy storage converter, and determine a DC impedance value of the energy storage converter according to the DC current value and the DC voltage value; The control module is used to adjust the proportional coefficient and integral coefficient of the proportional-integral controller of the energy storage converter according to the DC impedance value and the rated DC impedance value, and control the output of the PWM actuator of the energy storage converter according to the adjusted proportional coefficient and integral coefficient.

9. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method described in any one of claims 1 to 7 are implemented.

10. An electronic device, characterized in that: include: a memory having a computer program stored thereon; A processor, configured to execute the computer program in the memory to implement the steps of the method according to any one of claims 1 to 7.

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