CN115912439A - Method, device and equipment for determining modulation signal of current transformer and storage medium - Google Patents

Abstract

The invention discloses a method, device, device and storage medium for determining a modulation signal of a converter. The method includes: acquiring an input signal and a feedback signal, the input signal including a grid voltage reference value, a grid voltage measured value, and an energy storage power The reference value, 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, the feedback signal includes the measured output current of the converter; according to the grid voltage reference value, the measured value of the grid voltage and the energy storage power reference value, combined with the static Support and adjust the controller to determine the reference value of the static output current; 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, combined with the charge and discharge rate controller, determine the reference value of the charge and discharge current of the energy storage battery; according to the static The output current reference value, the energy storage battery charge and discharge current reference value, the grid voltage measured value and the converter measured output current determine the converter modulation signal.

Description

Method, device, equipment and storage medium for determining modulation signal of converter

technical field

The invention relates to the technical field of power grids, in particular to a method, device, equipment and storage medium for determining a modulation signal of a converter.

Background technique

With the increasing scale of photovoltaic power generation, the DC power grid has also become a research hotspot for scholars. If the direct current generated by the photovoltaic is directly transmitted to the load, the energy loss caused by the conversion of AC to DC power can be avoided. However, due to the uncertainty and intermittency of photovoltaic power, the high penetration of photovoltaics in the DC grid will bring great challenges to the grid. The disturbance of photovoltaic power may lead to grid instability problems such as grid voltage fluctuations and voltage over-limits. Energy storage plays an important role in stabilizing photovoltaic power fluctuations. In a DC power grid containing a large number of photovoltaics, how to ensure that the grid voltage changes within the range specified by the standard has become a difficult problem in current research.

Most of the existing methods use a single controller or coordinate energy storage and photovoltaic output control to maintain voltage fluctuations within a reasonable range. The output reduces the power generation income of the photovoltaic power station.

Contents of the invention

The invention provides a method, device, equipment and storage medium for determining a modulating signal of a converter, so as to maintain the stability of a DC power grid when there is a power disturbance.

According to an aspect of the present invention, a method for determining a modulation signal of a converter is provided, including:

Obtain an input signal and a feedback signal, the input signal includes grid voltage reference value, grid voltage measured value, energy storage power reference value, energy storage battery state of charge measured value and energy storage battery state of charge reference value, the feedback signal Including the measured output current of the converter;

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;

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, combined with the charge and discharge rate controller, determine the reference value of the charge and discharge current of the energy storage battery;

The converter modulation signal is determined according to the static output current reference value, the energy storage battery charge and discharge current reference value, the 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, according to the grid voltage reference value, the grid voltage measured value, and the energy storage power reference value, combined with a static support adjustment controller, the static output current reference value is determined, including:

Determine 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, combined with the set droop voltage control coefficient;

A product of the static current reference value and the static support adjustment controller is determined as the static output current reference value.

Further, the mathematical expression of the charge-discharge rate controller is related to the relationship between the measured value of the state of charge of the energy storage battery and the boundary value of battery power.

Further, 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, combined with the charge and discharge rate controller, the reference value of the charge and discharge current of the energy storage battery is determined, including:

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, combined with the set controller coefficient, determine the current reference value of the energy storage battery;

The product of the energy storage battery current reference value and the charge and discharge rate controller is determined as the energy storage battery charge and discharge current reference value.

Further, the converter modulation signal is determined according to the static output current reference value, the energy storage battery charge and discharge current reference value, the grid voltage measured value and the converter measured output current, including:

Determine the current reference value of the current control link according to the static output current reference value, the energy storage battery charge and discharge current reference value, the grid voltage measured value and the converter measured output current;

According to the current reference value of the current control link, the static output current reference value, the energy storage battery charge and discharge current reference value and the measured output current of the converter, combined with the set feedback coefficient, determine the converter modulator signal.

According to another aspect of the present invention, a device for determining a modulation signal of a converter is provided, including:

The input signal and feedback signal acquisition module is used to acquire the input signal and the feedback signal, the input signal includes grid voltage reference value, grid voltage measured value, energy storage power reference value, energy storage battery state of charge measured value and energy storage battery State of charge reference value, the feedback signal includes the measured output current of the converter;

A static voltage control module, configured to determine a static output current reference value based on 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;

The state of charge control module is used to determine the reference value of the charge and discharge current of the energy storage battery 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, in combination with the charge and discharge rate controller;

A converter modulation signal determination module, configured to determine the converter modulation signal according to the static output current reference value, the energy storage battery charge and discharge current reference value, the grid voltage measured value, and the converter measured output current. streamer modulation signal.

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 the magnitude relationship between the grid voltage measured value and the grid voltage reference value.

Optionally, the static voltage control module is also used for:

Determine a quiescent 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;

A product of the static current reference value and the static support adjustment controller is determined as the static output current reference value.

Optionally, the mathematical expression of the charge-discharge rate controller is related to the relationship between the measured value of the state of charge of the energy storage battery and the boundary value of battery power.

Optionally, the state of charge control module is also used for:

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, combined with the set controller coefficient, determine the current reference value of the energy storage battery;

The product of the energy storage battery current reference value and the charge and discharge rate controller is determined as the energy storage battery charge and discharge current reference value.

Optionally, the converter modulation signal determination module is also used for:

Determine the current reference value of the current control link according to the static output current reference value, the energy storage battery charge and discharge current reference value, the grid voltage measured value and the converter measured output current;

According to the current reference value of the current control link, the static output current reference value, the energy storage battery charge and discharge current reference value and the measured output current of the converter, combined with the set feedback coefficient, determine the converter modulator signal.

According to another aspect of the present invention, an electronic device is provided, and the electronic device includes:

at least one processor; and

a memory communicatively coupled to the at least one processor; wherein,

The memory stores a computer program that can be executed by the at least one processor, and the computer program is executed by the at least one processor, so that the at least one processor can execute the method described in any embodiment of the present invention. The determination method of the modulating signal of the converter.

According to another aspect of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement any of the embodiments of the present invention when executed. The determination method of the converter modulation signal.

An embodiment of the present invention provides a method for determining a modulation signal of a converter, including: acquiring an input signal and a feedback signal, the input signal including a grid voltage reference value, a grid voltage measured value, an energy storage power reference value, and an energy storage battery charge The actual measured value of the state and the reference value of the state of charge of the energy storage battery, the feedback signal includes the measured output current of the converter; according to the reference value of the grid voltage, the measured value of the grid voltage and the reference value of the energy storage power, combined with the static support to adjust the controller, determine the static output Current reference value; 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, combined with the charge and discharge rate controller, determine the reference value of the charge and discharge current of the energy storage battery; according to the static output current reference value, the energy storage battery The reference value of the charge and discharge current, the measured value of the grid voltage and the measured output current of the converter determine the modulation signal of the converter. The method for determining the modulation signal of the converter provided by the embodiment of the present invention controls the input signal of the energy storage converter, that is, the modulation signal of the converter, by establishing a closed-loop control loop, so as to ensure that the energy storage converter independently completes the stability of the power grid. After the grid voltage is disturbed, it can ensure the smooth change of the grid voltage while maintaining the state of charge of the energy storage battery.

It should be understood that the content described in this section is not intended to identify key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will be easily understood from the following description.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

FIG. 1 is a flow chart of a method for determining a modulation signal of a converter according to Embodiment 1 of the present invention;

Fig. 2 is a schematic diagram of a control process of a converter provided according to Embodiment 1 of the present invention;

Fig. 3 is a schematic diagram of a control circuit of a converter provided according to Embodiment 1 of the present invention;

Fig. 4 is a schematic diagram of control links in a control loop of a converter according to Embodiment 1 of the present invention;

Fig. 5 is a schematic structural diagram of a device for determining a modulation signal of a converter according to Embodiment 2 of the present invention;

FIG. 6 is a schematic structural diagram of an electronic device implementing a method for determining a modulating signal of a converter according to Embodiment 3 of the present invention.

Detailed ways

In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a sequence of steps or elements is not necessarily limited to the expressly listed instead, may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

Embodiment one

Fig. 1 is a flow chart of a method for determining a converter modulation signal provided by Embodiment 1 of the present invention. This embodiment is applicable to the situation of controlling an energy storage converter that suppresses power fluctuations in a DC power grid. The method It can be executed by the device for determining the modulation signal of the converter, which can be implemented in the form of hardware and/or software, and the device for determining the modulation signal of the converter can be configured in electronic equipment. As shown in Figure 1, the method includes:

S110. Obtain an input signal and a feedback signal. The input signal includes 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. The measured output current of the flowmeter.

Among them, the measured output current of the converter is positively correlated with the modulating signal of the converter.

In this embodiment, the energy storage converter is installed in the DC grid, which can control the charging and discharging process of the energy storage battery, thereby smoothing the power fluctuation in the DC grid. The control of the energy storage converter is realized through the control of the modulation signal of the converter.

Fig. 2 is a schematic diagram of a converter control process provided by an embodiment of the present invention. As shown in the figure, the input signal of the energy storage converter is the converter modulation signal (indicated by u _tr ), and the output signal is the converter The measured output current (indicated by i _o ) can be adjusted by controlling u _tr to achieve the purpose of stabilizing the power fluctuation in the DC grid, that is, to maintain the grid voltage measured value ( _indicated by u _g ) Stablize. Among them, the control of the converter modulation signal u _tr can be realized through four control links: static voltage control link, charge state control link, dynamic voltage support link and current control link. The specific control methods of each link will be described in detail below .

In the control loop of the converter, the input signal is the grid voltage reference value, the grid voltage measured value, the energy storage power reference value, the energy storage battery state of charge measured value and the energy storage battery state of charge reference value, the output signal and the feedback The signal is the measured output current of the converter. By controlling the modulation signal of the converter, the measured output current of the converter of the energy storage converter can be controlled, thereby controlling the power fluctuation in the DC power grid; the measured output current of the converter can be used as the control loop of the converter Feedback signal, so as to realize the closed-loop control of the converter.

Fig. 3 is a schematic diagram of a control circuit of a converter provided by an embodiment of the present invention. As shown in the figure, the grid voltage reference value, grid voltage measured value, energy storage power reference value, energy storage battery The reference values of the state of charge of the energy battery are expressed as U _g , _ug , _Pre , SoC and SoC _re respectively, and the measured output current of the converter is expressed as i _o , where i _o is the output signal and feedback signal of the entire closed-loop control loop. The modulating signal of the converter is denoted as u _tr , and the embodiment of the present invention realizes the control of the converter by controlling u _tr .

As shown in Figure 3, the relationship between the output signal i _o of the converter and the modulation signal u _tr of the converter can be expressed as:

S120. According to the grid voltage reference value, the grid voltage measured value and the energy storage power reference value, combined with the static support adjustment controller, determine the static output current reference value.

Among them, 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.

In this embodiment, the static support adjustment controller can be represented by G1, and the mathematical expression of G1 has different forms according to the relationship between the measured value of the grid voltage and the reference value of the grid voltage: when the measured value of the grid voltage is less than the reference value of the grid voltage, That is, when u _g < U _g , the mathematical expression of G1 is shown in formula (2); when the grid voltage measured value is greater than the grid voltage reference value, that is, u _g > U _g , the mathematical expression of G1 is as in formula (3) shown.

In the formula, SoC is the measured value of the state of charge of the energy storage battery, and SoC _m , SoC _L , SoC _p and SoC _q are the minimum value, maximum value, low power boundary value and high power boundary value of the energy storage battery state of charge, respectively.

Furthermore, according to the grid voltage reference value, grid voltage measured value and energy storage power reference value, combined with the static support adjustment controller, the way to determine the static output current reference value can be: according to the grid voltage reference value, grid voltage measured value and energy storage power The energy power reference value is combined with the set droop voltage control coefficient to determine the static current reference value; the product of the static current reference value and the static support adjustment controller is determined as the static output current reference value.

Optionally, the control link in this step can be called a static voltage control link. The input signals of the static voltage control link are grid voltage reference value U _g , grid voltage actual measurement value u _g and energy storage power reference value _Pre , and the output signal is Static output current reference value (expressed as I _r1 ). Among them, the static voltage control link includes the static voltage support link. The input signals of the static voltage support link are the grid voltage reference value U _g , the grid voltage measured value u _g and the energy storage power reference value _Pre , and the output signal is the static current reference value ( expressed as _Is ).

As shown in Figure 3, the control equation of the static voltage support link can be expressed as:

In the formula, K _i is the droop voltage control coefficient.

The output of the static current reference value I _s after passing through the static support adjustment controller G1 is the static output current reference value I _r1 :

I _r1 = I _s G1 (5)

S130. 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, combined with the charge and discharge rate controller, determine the reference value of the charge and discharge current of the energy storage battery.

Among them, the mathematical expression of the charge and discharge rate controller is related to the relationship between the measured value of the state of charge of the energy storage battery and the boundary value of the battery power.

In this embodiment, the charge and discharge rate controller can 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 is the reference value of the state of charge of the energy storage battery, SoC _p and SoC _q are the low power boundary value and the high power boundary value of the energy storage battery state of charge respectively, x Adjustment constant for positive values.

Further, 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, combined with the charge and discharge rate controller, the method of determining the reference value of the charge and discharge current of the energy storage battery can be: according to the state of charge of the energy storage battery The measured value and the reference value of the state of charge of the energy storage battery are combined with the set controller coefficient to determine the reference value of the energy storage battery current; the product of the energy storage battery current reference value and the charge and discharge rate controller is determined as the energy storage battery charge and discharge current reference.

Optionally, the control link of this step can be called the state of charge control link. The input signal of this link is the measured value SoC of the state of charge of the energy storage battery and the reference value SoC _re of the state of charge of the energy storage battery, and the output signal is the energy storage battery Battery charge and discharge current reference value (indicated by I _r2 ).

As shown in Figure 3, the energy storage battery current reference value (expressed as _Ic ) can be expressed as:

In the formula, s is the complex frequency domain parameter, k ₄ is the coefficient of the integral controller, and k ₅ is the coefficient of the proportional controller.

The output of the energy storage battery current reference value I _c after the charge and discharge rate controller G2 is the energy storage battery charge and discharge current reference value I _r2 :

I _r2 =I _c G2 (8)

S140. Determine the converter modulation signal according to the static output current reference value, the energy storage battery charge and discharge current reference value, the grid voltage measured value, and the converter measured output current.

In this embodiment, according to the static output current reference value, the energy storage battery charge and discharge current reference value, the measured value of the grid voltage and the measured output current of the converter, the way to determine the modulation signal of the converter may be: according to the static output current reference value, energy storage battery charging and discharging current reference value, grid voltage measured value and converter measured output current to determine the current control link current reference value; according to the current control link current reference value, static output current reference value, energy storage battery charging and discharging current The reference value and the measured output current of the converter are combined with the set feedback coefficient to determine the modulation signal of the converter.

Optionally, the control link in this step includes a dynamic voltage support link and a current control link, wherein the input signals of the dynamic voltage support link are static output current reference value I _r1 , energy storage battery charge and discharge current reference value I _r2 , grid voltage The measured value u _g and the measured output current i _o of the converter, the output signal is the current reference value of the current control link (indicated by I _r3 ); the input signal of the current control link is the current reference value of the current control link I _r3 , the dynamic voltage support link In the virtual capacitor voltage u _c and the measured output current i _o of the converter, the output signal is the converter modulation signal u _tr .

As shown in Figure 3, the dynamic voltage support link adopts a control method based on virtual capacitors connected in parallel with virtual resistors, and its control equation can be expressed as:

In the formula, s is a complex frequency domain parameter, C is a virtual capacitance, and R _i is a virtual resistance.

The current control link adopts the full state variable feedback control method, and its control equation can be expressed as:

s为复频域参数，k₁、k₂和k₃分别为虚拟电容电压反馈系数、输出电流误差积分反馈系数和输出电流比例反馈系数。In the formula, the virtual capacitor voltage

s is the complex frequency domain parameter, k ₁ , k ₂ and k ₃ are the virtual capacitor voltage feedback coefficient, output current error integral feedback coefficient and output current proportional feedback coefficient respectively.

Fig. 4 is a schematic diagram of the control links in the control loop of a converter provided by the embodiment of the present invention. As shown in the figure, each control link corresponds to a part of the entire control loop, through the static voltage control link, state of charge control link, dynamic voltage support link and current control link to get the converter modulation signal u _tr , u _tr is the input signal of the energy storage converter, and is used to adjust the output signal of the energy storage converter. The measured output current i of the converter _o .

An embodiment of the present invention provides a method for determining a modulation signal of a converter, including: acquiring an input signal and a feedback signal, the input signal including a grid voltage reference value, a grid voltage measured value, an energy storage power reference value, and an energy storage battery charge The actual measured value of the state and the reference value of the state of charge of the energy storage battery, the feedback signal includes the measured output current of the converter; according to the reference value of the grid voltage, the measured value of the grid voltage and the reference value of the energy storage power, combined with the static support to adjust the controller, determine the static output Current reference value; 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, combined with the charge and discharge rate controller, determine the reference value of the charge and discharge current of the energy storage battery; according to the static output current reference value, the energy storage battery The reference value of the charge and discharge current, the measured value of the grid voltage and the measured output current of the converter determine the modulation signal of the converter. The method for determining the modulation signal of the converter provided by the embodiment of the present invention controls the input signal of the energy storage converter, that is, the modulation signal of the converter, by establishing a closed-loop control loop, so as to ensure that the energy storage converter independently completes the stability of the power grid. After the grid voltage is disturbed, it can ensure the smooth change of the grid voltage while maintaining the state of charge of the energy storage battery.

Embodiment two

FIG. 5 is a schematic structural diagram of an apparatus for determining a modulation signal of a converter provided in Embodiment 2 of the present invention. As shown in FIG. 5 , the device includes: an input signal and feedback signal acquisition module 310 , a static voltage control module 320 , a charge state control module 330 and a converter modulation signal determination module 340 .

The input signal and feedback signal acquisition module 310 is used to acquire the input signal and the feedback signal. The input signal includes grid voltage reference value, grid voltage measured value, energy storage power reference value, energy storage battery state of charge measured value and energy storage battery charge The reference value of the electrical state, the feedback signal includes the measured output current of the converter.

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 used to determine the 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 the static support adjustment controller.

Optionally, 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.

Optionally, the static voltage control module 320 is also used for:

According to the grid voltage reference value, grid voltage measured value and energy storage power reference value, combined with the set droop voltage control coefficient, the static current reference value is determined; the product of the static current reference value and the static support adjustment controller is determined as the static output current Reference.

The state of charge control module 330 is used to determine the reference value of the charging and discharging current of the energy storage battery 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, in combination with the charge and discharge rate controller.

Optionally, the mathematical expression of the charge-discharge rate controller is related to the relationship between the measured value of the state of charge of the energy storage battery and the boundary value of the battery power.

Optionally, the state of charge control module 330 is also used for:

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, combined with the set controller coefficient, the current reference value of the energy storage battery is determined; the product of the current reference value of the energy storage battery and the charge and discharge rate controller Determined as the energy storage battery charge and discharge current reference value.

The converter modulation signal determination module 340 is used to determine the converter modulation signal according to the static output current reference value, the energy storage battery charge and discharge current reference value, the grid voltage measured value and the converter measured output current.

Optionally, the converter modulation signal determination module 340 is also used for:

According to the static output current reference value, the energy storage battery charge and discharge current reference value, the grid voltage measured value and the converter measured output current to determine the current control link current reference value; according to the current control link current reference value, static output current reference value, storage The reference value of the charging and discharging current of the battery and the measured output current of the converter, combined with the set feedback coefficient, determine the modulation signal of the converter.

The device for determining a modulating signal of a converter provided in an embodiment of the present invention can execute the method for determining a modulating signal of a converter provided in any embodiment of the present invention, and has corresponding functional modules and beneficial effects for executing the method.

Embodiment Three

FIG. 6 shows a schematic structural diagram of an electronic device 10 that can be used to implement an embodiment of the present invention. Electronic device is intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other suitable computers. Electronic devices may also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (eg, helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are by way of example only, and are not intended 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 connected in communication with the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores There is a computer program executable by at least one processor, and the processor 11 can operate according to a computer program stored in a read-only memory (ROM) 12 or loaded from a storage unit 18 into a random access memory (RAM) 13. Various appropriate actions and processes are performed. In the RAM 13, various programs and data necessary for the operation of the electronic device 10 can also be stored. The processor 11, ROM 12, and RAM 13 are connected to each other through a bus 14. An input/output (I/O) interface 15 is also connected to the bus 14 .

Multiple 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, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a magnetic disk, an optical disk etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, and the like. The communication unit 19 allows the electronic device 10 to exchange information/data with other devices through a computer network such as the Internet and/or various telecommunication networks.

Processor 11 may be various general and/or special purpose processing components having processing and computing capabilities. Some examples of processor 11 include, but are not limited to, central processing units (CPUs), graphics processing units (GPUs), various dedicated artificial intelligence (AI) computing chips, various processors that run machine learning model algorithms, digital signal processing processor (DSP), and any suitable processor, controller, microcontroller, etc. The processor 11 executes various methods and processes described above, such as a method for determining a modulating signal of a converter.

In some embodiments, the method for determining the modulation signal of the converter can be implemented as a computer program, which is tangibly embodied in a computer-readable storage medium, such as the storage unit 18 . In some embodiments, part or all of the computer program can be loaded and/or installed on 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 in any other appropriate way (for example, by means of firmware) to execute the method for determining the modulation signal of the converter.

Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips Implemented in a system of systems (SOC), load programmable logic device (CPLD), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include being implemented in one or more computer programs executable and/or interpreted on a programmable system including at least one programmable processor, the programmable processor Can be special-purpose or general-purpose programmable processor, can receive data and instruction from storage system, at least one input device, and at least one output device, and transmit data and instruction to this storage system, this at least one input device, and this at least one output device an output device.

Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus, so that the computer program causes the functions/operations specified in the flowcharts and/or block diagrams to be implemented when executed by the processor. A computer program may execute entirely on the machine, partly on the machine, as a stand-alone software package partly on the machine and partly on a remote machine or entirely on the remote machine or server.

In the context of the present invention, a computer readable storage medium may be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus or device. A computer readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. Alternatively, a computer readable storage medium may be a machine readable signal medium. More specific examples of machine-readable storage media would include one or more wire-based electrical connections, portable computer discs, hard drives, random access memory (RAM), read only memory (ROM), erasable programmable read only memory (EPROM or flash memory), optical fiber, compact disk read only memory (CD-ROM), optical storage, magnetic storage, or any suitable combination of the foregoing.

In order to provide interaction with the user, the systems and techniques described herein can be implemented on an electronic device having a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display)) for displaying information to the user. monitor); and a keyboard and pointing device (eg, a mouse or a trackball) through which the user can provide input to the electronic device. Other kinds of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and can be in any form (including Acoustic input, speech input or, tactile input) to receive input from the user.

The systems and techniques described herein can be implemented in a computing system that includes back-end components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes front-end components (e.g., as a a user computer having a graphical user interface or web browser through which a user can interact with embodiments of the systems and techniques described herein), or including such backend components, middleware components, Or any combination of front-end components in a computing system. The components of the system can be interconnected by any form or medium of digital data communication, eg, a communication network. Examples of communication networks include: local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

A computing system can include clients and servers. Clients and servers are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also known as a cloud computing server or a cloud host. It is a host product in the cloud computing service system to solve the problems of difficult management and weak business expansion in traditional physical hosts and VPS services. defect.

It should be understood that steps may be reordered, added or deleted using the various forms of flow shown above. For example, each step described in the present invention may be executed in parallel, sequentially, or in a different order, as long as the desired result of the technical solution of the present invention can be achieved, there is no limitation herein.

The above specific implementation methods do not constitute a limitation to the protection scope of the present invention. It should be apparent to those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made depending on design requirements and other factors. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included within 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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