CN115912439A - Method, device and equipment for determining modulation signal of current transformer and storage medium - Google Patents
Method, device and equipment for determining modulation signal of current transformer and storage medium Download PDFInfo
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Abstract
The invention discloses a method, a device, equipment and a storage medium for determining a modulation signal of a current transformer, wherein the method comprises the following steps: acquiring an input signal and a feedback signal, wherein the input signal comprises a power grid voltage reference value, a power grid voltage measured value, an energy storage power reference value, an energy storage battery charge state measured value and an energy storage battery charge state reference value, and the feedback signal comprises a current transformer measured output current; determining a static output current reference value by combining a static support adjustment controller according to the grid voltage reference value, the grid voltage measured value and the energy storage power reference value; determining a charging and discharging current reference value of the energy storage battery by combining a charging and discharging rate controller according to the actual charge state measurement value and the reference charge state value of the energy storage battery; and determining a modulation signal of the converter according to the reference value of the static output current, the reference value of the charging and discharging current of the energy storage battery, the measured value of the voltage of the power grid and the measured output current of the converter.
Description
Technical Field
The invention relates to the technical field of power grids, in particular to a method, a device, equipment and a storage medium for determining a modulation signal of a converter.
Background
With the increasing scale of photovoltaic power generation, the direct current power grid also becomes a hot point for research of students. If the direct current generated by the photovoltaic is directly transmitted to the load, the energy loss caused by the alternating current-direct current electric energy conversion can be avoided. However, due to uncertainty and intermittency of photovoltaic power, high-permeability photovoltaic in a direct current power grid will bring huge challenges to the power grid. Disturbance of photovoltaic power may cause grid instability problems such as grid voltage fluctuation, voltage out-of-limit, and the like. The stored energy plays an important role in stabilizing photovoltaic power fluctuation, and in a direct-current power grid comprising a large number of photovoltaics, how to ensure that the voltage of the power grid changes within a standard specified range becomes a difficult problem of current research.
In the existing method, a single controller is adopted or energy storage and photovoltaic output control are coordinated to maintain the voltage fluctuation within a reasonable range, so that on one hand, the problem of the grid voltage caused by the power fluctuation of new energy is difficult to effectively solve, on the other hand, the photovoltaic output is reduced, and the generation benefit of a photovoltaic power station is reduced.
Disclosure of Invention
The invention provides a method, a device, equipment and a storage medium for determining a modulation signal of a converter, which are used for maintaining the stability of a direct current power grid when power disturbance exists.
According to an aspect of the present invention, there is provided a method for determining a modulation signal of a current transformer, including:
acquiring an input signal and a feedback signal, wherein the input signal comprises a power grid voltage reference value, a power grid voltage measured value, an energy storage power reference value, an energy storage battery charge state measured value and an energy storage battery charge state reference value, and the feedback signal comprises a converter actual measurement output current;
determining a static output current reference value by combining a static support adjustment controller according to the power grid voltage reference value, the power grid voltage measured value and the energy storage power reference value;
determining a charging and discharging current reference value of the energy storage battery by combining a charging and discharging rate controller according to the energy storage battery charge state measured value and the energy storage battery charge state reference value;
and determining the converter modulation signal according to the static output current reference value, the energy storage battery charging and discharging current reference value, the power grid voltage measured value and the converter measured output current.
Further, the measured output current of the converter is positively correlated with the modulation signal of the converter.
Further, the mathematical expression of the static support adjustment controller is related to the magnitude relationship between the grid voltage measured value and the grid voltage reference value.
Further, determining a static output current reference value according to the grid voltage reference value, the grid voltage measured value and the energy storage power reference value in combination with a static support adjustment controller, includes:
determining a static current reference value (static voltage support) according to the grid voltage reference value, the grid voltage measured value and the energy storage power reference value and by combining a set droop voltage control coefficient;
determining the product of the quiescent current reference value and the static support adjustment controller as the quiescent output current reference value.
Further, the mathematical expression of the charge and discharge rate controller is related to the magnitude relation between the measured value of the state of charge of the energy storage battery and the boundary value of the electric quantity of the battery.
Further, determining a reference value of the charging and discharging current of the energy storage battery by combining a charging and discharging rate controller according to the measured value of the state of charge of the energy storage battery and the reference value of the state of charge of the energy storage battery, including:
determining a current reference value of the energy storage battery according to the actually measured value of the state of charge of the energy storage battery and the reference value of the state of charge of the energy storage battery in combination with a set controller coefficient;
and determining the product of the energy storage battery current reference value and the charge-discharge rate controller as the energy storage battery charge-discharge current reference value.
Further, determining the converter modulation signal according to the static output current reference value, the energy storage battery charging and discharging current reference value, the grid voltage measured value and the converter measured output current, includes:
determining a current reference value of a current control link according to the static output current reference value, the charge-discharge current reference value of the energy storage battery, the measured value of the grid voltage and the measured output current of the converter;
and determining the modulation signal of the converter according to the current reference value of the current control link, the static output current reference value, the charge and discharge current reference value of the energy storage battery and the actually-measured output current of the converter by combining a set feedback coefficient.
According to another aspect of the present invention, there is provided a device for determining a modulation signal of a current transformer, including:
the system comprises an input signal and feedback signal acquisition module, a feedback signal acquisition module and a feedback signal processing module, wherein the input signal comprises a power grid voltage reference value, a power grid voltage measured value, an energy storage power reference value, an energy storage battery charge state measured value and an energy storage battery charge state reference value, and the feedback signal comprises a converter actual measurement output current;
the static voltage control module is used for determining a static output current reference value according to the power grid voltage reference value, the power grid voltage measured value and the energy storage power reference value by combining a static support adjustment controller;
the charge state control module is used for determining a charge and discharge current reference value of the energy storage battery by combining a charge and discharge rate controller according to the charge state measured value of the energy storage battery and the charge state reference value of the energy storage battery;
and the converter modulation signal determining module is used for determining the converter modulation signal according to the static output current reference value, the energy storage battery charging and discharging current reference value, the power grid voltage measured value and the converter measured output current.
Optionally, the measured output current of the converter is positively correlated with the modulation signal of the converter.
Optionally, the mathematical expression of the static support adjustment controller is related to a magnitude relationship between the grid voltage measured value and the grid voltage reference value.
Optionally, the static voltage control module is further configured to:
determining a static current reference value according to the power grid voltage reference value, the power grid voltage measured value and the energy storage power reference value and by combining a set droop voltage control coefficient;
determining the product of the quiescent current reference value and the static support adjustment controller as the quiescent output current reference value.
Optionally, the mathematical expression of the charge and discharge rate controller is related to a magnitude relationship between the measured value of the state of charge of the energy storage battery and the boundary value of the electric quantity of the battery.
Optionally, the state of charge control module is further configured to:
determining a current reference value of the energy storage battery according to the actually measured value of the state of charge of the energy storage battery and the reference value of the state of charge of the energy storage battery in combination with a set controller coefficient;
and determining the product of the energy storage battery current reference value and the charge-discharge rate controller as the energy storage battery charge-discharge current reference value.
Optionally, the converter modulation signal determining module is further configured to:
determining a current reference value of a current control link according to the static output current reference value, the charge-discharge current reference value of the energy storage battery, the measured value of the grid voltage and the measured output current of the converter;
and determining the modulation signal of the converter according to the current reference value of the current control link, the static output current reference value, the charge and discharge current reference value of the energy storage battery and the actually-measured output current of the converter by combining a set feedback coefficient.
According to another aspect of the present invention, there is provided an electronic apparatus including:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,
the memory stores a computer program executable by the at least one processor, the computer program being executable by the at least one processor to enable the at least one processor to perform the method for determining a modulation signal of a current transformer according to any of the embodiments of the present invention.
According to another aspect of the present invention, a computer-readable storage medium is provided, which stores computer instructions for causing a processor to implement the method for determining the modulation signal of the current transformer according to any embodiment of the present invention when the computer instructions are executed.
The embodiment of the invention provides a method for determining a modulation signal of a current transformer, which comprises the following steps: acquiring an input signal and a feedback signal, wherein the input signal comprises a power grid voltage reference value, a power grid voltage measured value, an energy storage power reference value, an energy storage battery charge state measured value and an energy storage battery charge state reference value, and the feedback signal comprises a converter actual measurement output current; determining a static output current reference value by combining a static support adjustment controller according to the grid voltage reference value, the grid voltage measured value and the energy storage power reference value; determining a charging and discharging current reference value of the energy storage battery by combining a charging and discharging rate controller according to the actual charge state measurement value and the reference charge state value of the energy storage battery; and determining a modulation signal of the converter according to the reference value of the static output current, the reference value of the charging and discharging current of the energy storage battery, the measured value of the voltage of the power grid and the measured output current of the converter. According to the method for determining the modulation signal of the converter, the input signal of the energy storage converter, namely the modulation signal of the converter, is controlled by establishing the closed-loop control circuit, so that the energy storage converter is enabled to independently complete the support of the stability of a power grid, the voltage of the power grid is enabled to smoothly change after the voltage of the power grid is disturbed, and the state of charge of an energy storage battery is maintained.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present invention, nor do they necessarily limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a method for determining a modulation signal of a converter according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating a converter control process according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a control loop of a converter according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a control link in a control loop of a converter according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a device for determining a modulation signal of a current transformer according to a second embodiment of the present invention;
fig. 6 is a schematic structural diagram of an electronic device for implementing the method for determining the modulation signal of the current transformer according to the third embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example one
Fig. 1 is a flowchart of a method for determining a modulation signal of a converter according to an embodiment of the present invention, where the method is applicable to a case of controlling an energy storage converter for stabilizing power fluctuation in a dc power grid, and the method may be implemented by a device for determining a modulation signal of a converter, where the device for determining a modulation signal of a converter may be implemented in a form of hardware and/or software, and the device for determining a modulation signal of a converter may be configured in an electronic device. As shown in fig. 1, the method includes:
s110, an input signal and a feedback signal are obtained, wherein the input signal comprises a power grid voltage reference value, a power grid voltage measured value, an energy storage power reference value, an energy storage battery charge state measured value and an energy storage battery charge state reference value, and the feedback signal comprises a converter actual measurement output current.
The measured output current of the converter is positively correlated with the modulation signal of the converter.
In the embodiment, the energy storage converter is installed in a direct current power grid, and can control the charging and discharging processes of the energy storage battery, so that the power fluctuation in the direct current power grid is stabilized. The control of the energy storage converter is realized by controlling the modulation signal of the converter.
Fig. 2 is a schematic diagram of a converter control process according to an embodiment of the present invention, where an input signal of an energy storage converter is a converter modulation signal (u is used as the input signal of the energy storage converter tr Expressed), the output signal is the measured output current (i) of the converter o Represent), canBy making a pair u tr Control of i, realize the control of o Finally, the purpose of stabilizing the power fluctuation in the direct current power grid is achieved, namely, the measured value (in u) of the grid voltage is maintained g Indicated). Wherein, the current transformer is modulated with a signal u tr The control of the voltage-based photovoltaic power generation system can be realized through four control links, namely a static voltage control link, a charge state control link, a dynamic voltage support link and a current control link, and the specific control mode of each link is described in detail below.
In a control loop of the converter, input signals are a power grid voltage reference value, a power grid voltage measured value, an energy storage power reference value, an energy storage battery charge state measured value and an energy storage battery charge state reference value, and output signals and feedback signals are converter actual measurement output currents. The modulation signal of the converter is controlled, so that the actually measured output current of the converter of the energy storage converter can be controlled, and the power fluctuation in a direct current power grid is controlled; the actually measured output current of the converter can be used as a feedback signal of a control loop of the converter, so that closed-loop control of the converter is realized.
Fig. 3 is a schematic diagram of a control loop of a converter according to an embodiment of the present invention, as shown in the figure, a grid voltage reference value, a grid voltage measured value, an energy storage power reference value, an energy storage battery state of charge measured value, and an energy storage battery state of charge reference value are respectively represented as U g 、u g 、P re SoC and SoC re The measured output current of the current transformer is represented as i o ，i o Is the output signal and feedback signal of the whole closed-loop control loop. The converter modulation signal is denoted u tr In the embodiment of the invention, u is paired tr The control of the converter is realized.
As shown in fig. 3, the output signal i of the converter o And the converter modulation signal u tr Can be expressed as:
and S120, determining a static output current reference value according to the power grid voltage reference value, the power grid voltage measured value and the energy storage power reference value by combining the static support adjustment controller.
The mathematical expression of the static support adjustment controller is related to the magnitude relation between the grid voltage measured value and the grid voltage reference value.
In this embodiment, the static support adjustment controller may be represented by G1, and the mathematical expression of G1 has different forms according to the relationship between the grid voltage measured value and the grid voltage reference value: when the measured value of the grid voltage is smaller than the reference value of the grid voltage, i.e. u g ＜U g Then, the mathematical expression of G1 is shown as formula (2); when the measured value of the grid voltage is larger than the reference value of the grid voltage, i.e. u g ＞U g Then, the mathematical expression of G1 is shown in formula (3).
In the formula, soC is the measured value of the state of charge of the energy storage battery, soC m 、SoC L 、SoC p And SoC q The minimum value, the maximum value, the low electric quantity boundary value and the high electric quantity boundary value of the charge state of the energy storage battery are respectively.
Further, according to the grid voltage reference value, the grid voltage measured value and the energy storage power reference value, in combination with the static support adjustment controller, the manner of determining the static output current reference value may be: determining a static current reference value according to the grid voltage reference value, the grid voltage measured value and the energy storage power reference value in combination with a set droop voltage control coefficient; the product of the quiescent current reference value and the quiescent support adjustment controller is determined as the quiescent output current reference value.
Optionally, the control link of this step may be referred to as a static voltage control link, and an input signal of the static voltage control link is a grid voltage reference value U g The measured value of the grid voltageu g And a reference value P of the energy storage power re The output signal is the static output current reference value (with I) r1 Representation). The static voltage control link comprises a static voltage support link, and an input signal of the static voltage support link is a power grid voltage reference value U g The measured value u of the grid voltage g And a reference value P of the energy storage power re The output signal is the quiescent current reference value (with I) s Representation).
As shown in fig. 3, the control equation of the static voltage support element can be expressed as:
in the formula, K i The droop voltage control coefficient.
Quiescent current reference value I s The output after passing through the static support adjustment controller G1 is the reference value I of the static output current r1 ：
I r1 ＝I s G1 (5)
And S130, determining a charging and discharging current reference value of the energy storage battery by combining the charging and discharging rate controller according to the actually measured value of the state of charge of the energy storage battery and the reference value of the state of charge of the energy storage battery.
The mathematical expression of the charge and discharge rate controller is related to the relationship between the actually measured value of the charge state of the energy storage battery and the boundary value of the electric quantity of the battery.
In the present embodiment, the charge-discharge rate controller may be represented by G2, and the mathematical expression of G2 is as follows:
in the formula, soC is the measured value of the state of charge of the energy storage battery, soC re For reference value of state of charge of energy storage battery, soC p And SoC q The low electric quantity boundary value and the high electric quantity boundary value of the charge state of the energy storage battery are respectively, and x is a positive value regulating constant.
Furthermore, according to the actual charge state measurement value of the energy storage battery and the reference charge state value of the energy storage battery, in combination with the charge and discharge rate controller, the method for determining the reference charge and discharge current value of the energy storage battery may be: determining a current reference value of the energy storage battery according to the actually measured value of the state of charge of the energy storage battery and the reference value of the state of charge of the energy storage battery in combination with a set controller coefficient; and determining the product of the energy storage battery current reference value and the charge-discharge rate controller as the energy storage battery charge-discharge current reference value.
Optionally, the control link of this step may be referred to as a charge state control link, and input signals of the link are an energy storage battery charge state measured value SoC and an energy storage battery charge state reference value SoC re The output signal is the reference value of the charging and discharging current of the energy storage battery (by I) r2 Indicated).
As shown in fig. 3, the energy storage battery current reference value (in I) c Representation) can be represented as:
where s is a complex frequency domain parameter, k 4 For integrating the controller coefficient, k 5 Are proportional controller coefficients.
Reference value I of energy storage battery current c The output of the energy storage battery after passing through the charge-discharge rate controller G2 is the reference value I of the charge-discharge current of the energy storage battery r2 ：
I r2 ＝I c G2 (8)
And S140, determining a modulation signal of the converter according to the reference value of the static output current, the reference value of the charging and discharging current of the energy storage battery, the measured value of the voltage of the power grid and the measured output current of the converter.
In this embodiment, the method for determining the modulation signal of the converter according to the reference value of the static output current, the reference value of the charging and discharging current of the energy storage battery, the measured value of the grid voltage, and the measured output current of the converter may be: determining a current reference value of a current control link according to the static output current reference value, the charge-discharge current reference value of the energy storage battery, the measured value of the grid voltage and the measured output current of the converter; and determining a current transformer modulation signal according to a current reference value of a current control link, a static output current reference value, a charge and discharge current reference value of the energy storage battery and the actually-measured output current of the current transformer by combining a set feedback coefficient.
Optionally, the control link of this step includes a dynamic voltage support link and a current control link, where an input signal of the dynamic voltage support link is a static output current reference value I r1 Reference value I of charging and discharging current of energy storage battery r2 The measured value u of the grid voltage g And the actually measured output current i of the current transformer o The output signal is the current reference value (with I) of the current control link r3 Represents); the input signal of the current control link is the current reference value I of the current control link r3 Virtual capacitor voltage u in dynamic voltage support link c And the actually measured output current i of the current transformer o The output signal is a modulation signal u of the converter tr 。
As shown in fig. 3, the dynamic voltage support link adopts a control method based on virtual capacitors and virtual resistors connected in parallel, and a control equation of the control method can be expressed as follows:
wherein s is a complex frequency domain parameter, C is a virtual capacitor, and R is i Is a virtual resistance.
The current control link adopts a full-state variable feedback control method, and a control equation can be expressed as follows:
in the formula, the virtual capacitor voltage
s is a complex frequency domain parameter, k 1 、k 2 And k 3 Respectively a virtual capacitor voltage feedback coefficient, an output current error integral feedback coefficient and an output currentAnd (4) proportional feedback coefficient.
Fig. 4 is a schematic diagram of control links in a control loop of a converter according to an embodiment of the present invention, where each control link corresponds to a part of the entire control loop, and a modulation signal u of the converter is obtained after a static voltage control link, a charge state control link, a dynamic voltage support link, and a current control link tr ，u tr For input signal of energy storage converter, for regulating output signal of energy storage converter and actually-measured output current i of converter o 。
The embodiment of the invention provides a method for determining a modulation signal of a converter, which comprises the following steps: acquiring an input signal and a feedback signal, wherein the input signal comprises a power grid voltage reference value, a power grid voltage measured value, an energy storage power reference value, an energy storage battery charge state measured value and an energy storage battery charge state reference value, and the feedback signal comprises a converter actual measurement output current; determining a static output current reference value by combining a static support adjustment controller according to the grid voltage reference value, the grid voltage measured value and the energy storage power reference value; determining a charging and discharging current reference value of the energy storage battery by combining a charging and discharging rate controller according to the actually measured value of the state of charge of the energy storage battery and the reference value of the state of charge of the energy storage battery; and determining a modulation signal of the converter according to the reference value of the static output current, the reference value of the charging and discharging current of the energy storage battery, the measured value of the voltage of the power grid and the measured output current of the converter. According to the method for determining the modulation signal of the converter, the input signal of the energy storage converter, namely the modulation signal of the converter, is controlled by establishing the closed-loop control circuit, so that the energy storage converter is guaranteed to independently complete the support of the stability of a power grid, the voltage of the power grid is guaranteed to smoothly change after the voltage of the power grid is disturbed, and the state of charge of an energy storage battery is maintained.
Example two
Fig. 5 is a schematic structural diagram of a device for determining a modulation signal of a current transformer according to a second embodiment of the present invention. As shown in fig. 5, the apparatus includes: an input signal and feedback signal acquisition module 310, a static voltage control module 320, a state of charge control module 330, and a converter modulation signal determination module 340.
The input signal and feedback signal obtaining module 310 is configured to obtain an input signal and a feedback signal, where the input signal includes a grid voltage reference value, a grid voltage actual measurement value, an energy storage power reference value, an energy storage battery state of charge actual measurement value, and an energy storage battery state of charge reference value, and the feedback signal includes a converter actual measurement output current.
Optionally, the measured output current of the converter is positively correlated with the modulation signal of the converter.
The static voltage control module 320 is configured to determine a static output current reference value by combining the static support adjustment controller according to the grid voltage reference value, the grid voltage measured value, and the energy storage power reference value.
Optionally, the mathematical expression of the static support adjustment controller is related to a magnitude relationship between the grid voltage measured value and the grid voltage reference value.
Optionally, the static voltage control module 320 is further configured to:
determining a static current reference value according to the grid voltage reference value, the grid voltage measured value and the energy storage power reference value in combination with a set droop voltage control coefficient; the product of the quiescent current reference value and the quiescent support adjustment controller is determined as the quiescent output current reference value.
The charge state control module 330 is configured to determine a charge and discharge current reference value of the energy storage battery by combining the charge and discharge rate controller according to the actual charge state measurement value of the energy storage battery and the charge state reference value of the energy storage battery.
Optionally, the mathematical expression of the charge and discharge rate controller is related to a relationship between the measured value of the state of charge of the energy storage battery and the boundary value of the electric quantity of the battery.
Optionally, the state of charge control module 330 is further configured to:
determining a current reference value of the energy storage battery according to the actually measured value of the state of charge of the energy storage battery and the reference value of the state of charge of the energy storage battery in combination with a set controller coefficient; and determining the product of the energy storage battery current reference value and the charge-discharge rate controller as the energy storage battery charge-discharge current reference value.
The converter modulation signal determining module 340 is configured to determine a converter modulation signal according to the static output current reference value, the energy storage battery charging and discharging current reference value, the power grid voltage actual measurement value, and the converter actual measurement output current.
Optionally, the converter modulation signal determination module 340 is further configured to:
determining a current reference value of a current control link according to the static output current reference value, the charge-discharge current reference value of the energy storage battery, the measured value of the grid voltage and the measured output current of the converter; and determining a modulation signal of the converter according to a current reference value of a current control link, a static output current reference value, a charge and discharge current reference value of the energy storage battery and the actually-measured output current of the converter by combining a set feedback coefficient.
The device for determining the modulation signal of the converter provided by the embodiment of the invention can execute the method for determining the modulation signal of the converter provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method.
EXAMPLE III
FIG. 6 illustrates a schematic structural diagram of an electronic device 10 that may be used to implement an embodiment of the present invention. Electronic devices are intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. The electronic device may also represent various forms of mobile devices, such as personal digital assistants, cellular phones, smart phones, wearable devices (e.g., helmets, glasses, watches, etc.), 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.
As shown in fig. 6, the electronic device 10 includes at least one processor 11, and a memory communicatively connected to the at least one processor 11, such as a Read Only Memory (ROM) 12, a Random Access Memory (RAM) 13, and the like, wherein the memory stores a computer program executable by the at least one processor, and the processor 11 can perform various suitable actions and processes according to the computer program stored in the Read Only Memory (ROM) 12 or the computer program loaded from a storage unit 18 into the Random Access Memory (RAM) 13. In the RAM 13, various programs and data necessary for the operation of the electronic apparatus 10 may also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other via a bus 14. An input/output (I/O) interface 15 is also connected to bus 14.
A number of components in the electronic device 10 are connected to the I/O interface 15, including: an input unit 16 such as a keyboard, a mouse, or the like; an output unit 17 such as various types of displays, speakers, and the like; a storage unit 18 such as a magnetic disk, optical disk, or the like; and a communication unit 19 such as a network card, modem, wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information/data with other devices via a computer network such as the internet and/or various telecommunication networks.
The processor 11 may be a variety of general and/or special purpose processing components having processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), various specialized Artificial Intelligence (AI) computing chips, various processors running machine learning model algorithms, a Digital Signal Processor (DSP), and any suitable processor, controller, microcontroller, or the like. The processor 11 performs the various methods and processes described above, such as the determination of the current transformer modulation signal.
In some embodiments, the method of determining the current transformer modulation signal may be implemented as a computer program tangibly embodied in a computer readable storage medium, such as the storage unit 18. In some embodiments, part or all of the computer program may be loaded and/or installed onto the electronic device 10 via the ROM 12 and/or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the determination of the converter modulation signal described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured by any other suitable means (e.g. by means of firmware) to perform the determination method of the converter modulation signal.
Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuitry, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), system on a chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs that are executable and/or interpretable on a programmable system including at least one programmable processor, which may be special or general purpose, receiving data and instructions from, and transmitting data and instructions to, a storage system, at least one input device, and at least one output device.
A computer program for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be performed. A computer program can execute entirely on a machine, partly on a machine, as a stand-alone software package partly on a machine and partly on a remote machine or entirely on a remote machine or server.
In the context of the present invention, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. A computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
To provide for interaction with a user, the systems and techniques described here can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) by which a user can provide input to the electronic device. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form, including acoustic, speech, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a back-end component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such back-end, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), wide Area Networks (WANs), blockchain networks, and the internet.
The computing 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. The server can be a cloud server, also called a cloud computing server or a cloud host, and is a host product in a cloud computing service system, so that the defects of high management difficulty and weak service expansibility in the traditional physical host and VPS service are overcome.
It should be understood that various forms of the flows shown above, reordering, adding or deleting steps, may be used. For example, the steps described in the present invention may be executed in parallel, sequentially, or in different orders, and are not limited herein as long as the desired results of the technical solution of the present invention can be achieved.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for determining a modulation signal of a converter, comprising:
acquiring an input signal and a feedback signal, wherein the input signal comprises a power grid voltage reference value, a power grid voltage measured value, an energy storage power reference value, an energy storage battery charge state measured value and an energy storage battery charge state reference value, and the feedback signal comprises a converter actual measurement output current;
determining a static output current reference value by combining a static support adjustment controller according to the power grid voltage reference value, the power grid voltage measured value and the energy storage power reference value;
determining a charging and discharging current reference value of the energy storage battery by combining a charging and discharging rate controller according to the energy storage battery charge state measured value and the energy storage battery charge state reference value;
and determining the modulation signal of the converter according to the reference value of the static output current, the reference value of the charging and discharging current of the energy storage battery, the measured value of the voltage of the power grid and the measured output current of the converter.
2. The method of claim 1, wherein the measured converter output current is positively correlated with the converter modulation signal.
3. The method of claim 2, wherein the mathematical expression of the static support adjustment controller is related to a magnitude relationship between the grid voltage measured value and the grid voltage reference value.
4. The method of claim 3, wherein determining a static output current reference value according to the grid voltage reference value, the grid voltage measured value and the energy storage power reference value in combination with a static support adjustment controller comprises:
determining a static current reference value according to the power grid voltage reference value, the power grid voltage measured value and the energy storage power reference value and by combining a set droop voltage control coefficient;
determining the product of the quiescent current reference value and the static support adjustment controller as the quiescent output current reference value.
5. The method of claim 2, wherein the mathematical expression of the charge-discharge rate controller is related to a magnitude relationship between the measured energy storage battery state of charge and a battery charge boundary value.
6. The method of claim 5, wherein determining the reference charge/discharge current value of the energy storage battery according to the measured charge state value of the energy storage battery and the reference charge state value of the energy storage battery in combination with the charge/discharge rate controller comprises:
determining a current reference value of the energy storage battery according to the actually measured value of the state of charge of the energy storage battery and the reference value of the state of charge of the energy storage battery in combination with a set controller coefficient;
and determining the product of the energy storage battery current reference value and the charge-discharge rate controller as the energy storage battery charge-discharge current reference value.
7. The method of claim 2, wherein determining the converter modulation signal according to the static output current reference value, the energy storage battery charging/discharging current reference value, the grid voltage measured value and the converter measured output current comprises:
determining a current reference value of a current control link according to the static output current reference value, the charge-discharge current reference value of the energy storage battery, the measured value of the grid voltage and the measured output current of the converter;
and determining the modulation signal of the converter according to the current reference value of the current control link, the static output current reference value, the charge and discharge current reference value of the energy storage battery and the actually-measured output current of the converter by combining a set feedback coefficient.
8. A device for determining a modulation signal of a current transformer, comprising:
the system comprises an input signal and feedback signal acquisition module, a feedback signal acquisition module and a feedback signal processing module, wherein the input signal comprises a power grid voltage reference value, a power grid voltage measured value, an energy storage power reference value, an energy storage battery charge state measured value and an energy storage battery charge state reference value, and the feedback signal comprises a converter actual measurement output current;
the static voltage control module is used for determining a static output current reference value according to the power grid voltage reference value, the power grid voltage measured value and the energy storage power reference value by combining a static support adjustment controller;
the charge state control module is used for determining a charge and discharge current reference value of the energy storage battery by combining a charge and discharge rate controller according to the charge state measured value of the energy storage battery and the charge state reference value of the energy storage battery;
and the converter modulation signal determining module is used for determining the converter modulation signal according to the static output current reference value, the energy storage battery charging and discharging current reference value, the power grid voltage measured value and the converter measured output current.
9. An electronic device, characterized in that the electronic device comprises:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,
the memory stores a computer program executable by the at least one processor, the computer program being executable by the at least one processor to enable the at least one processor to perform the method of determining a current transformer modulation signal as claimed in any one of claims 1 to 7.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores computer instructions for causing a processor to implement the method for determining a converter modulation signal according to any one of claims 1-7 when executed.
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| CN202211439073.1A CN115912439A (en) | 2022-11-17 | 2022-11-17 | Method, device and equipment for determining modulation signal of current transformer and storage medium |
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