CN111769587A - Power grid frequency modulation control method and device with participation of photovoltaic power generation - Google Patents

Power grid frequency modulation control method and device with participation of photovoltaic power generation Download PDF

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CN111769587A
CN111769587A CN201910256824.8A CN201910256824A CN111769587A CN 111769587 A CN111769587 A CN 111769587A CN 201910256824 A CN201910256824 A CN 201910256824A CN 111769587 A CN111769587 A CN 111769587A
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photovoltaic
array
voltage
offline model
current
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王小娜
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Xinao Shuneng Technology Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/48—Controlling the sharing of the in-phase component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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Abstract

The invention discloses a power grid frequency modulation control method and device with participation of photovoltaic power generation, wherein the method comprises the following steps: establishing a photovoltaic array offline model; obtaining a corresponding relation between the photovoltaic vibration reduction rate and the photovoltaic physical parameters according to the established photovoltaic array offline model; in the actual operation of a power station, measuring and calculating the photovoltaic array temperature, the photovoltaic illumination intensity and the photovoltaic vibration attenuation rate reference value; bringing the photovoltaic array temperature, the photovoltaic illumination intensity and the photovoltaic damping rate reference value into the established photovoltaic array model to obtain the corresponding relation between the photovoltaic damping rate reference value and the photovoltaic reference physical parameter; and adjusting the current voltage value of the power grid through a power tracking algorithm according to the corresponding relation between the photovoltaic load shedding rate reference value and the photovoltaic reference physical parameter. According to the method, the fault tolerance of load shedding control is improved by combining offline fitting and online tracking, and the load shedding operation level of the photovoltaic unit can be changed according to the power grid frequency, so that the photovoltaic unit can participate in upward/downward power grid frequency adjustment.

Description

Power grid frequency modulation control method and device with participation of photovoltaic power generation
Technical Field
The invention relates to the technical field of photovoltaic power generation, in particular to a power grid frequency modulation control method and device with participation of photovoltaic power generation.
Background
The new energy unit is largely connected to a power grid to reduce the rotation inertia and primary frequency modulation resources of a power system, so that the frequency fluctuation is increased when the power grid operates, in order to realize participation in power grid frequency adjustment, photovoltaic load shedding operation is generally adopted at present, most of the photovoltaic load shedding operation adopts a quadratic linear function to estimate a maximum power value, and a reference power is set as part of maximum estimated power to realize load shedding control. However, because the photovoltaic array is a nonlinear function, the power estimation error by adopting a quadratic function is large.
Disclosure of Invention
The embodiment of the invention provides a grid frequency modulation control method and device with participation of photovoltaic power generation, which improve the fault tolerance of load shedding control by combining offline fitting and online tracking, can be seamlessly fused with the conventional maximum power tracking method, and can change the load shedding operation level of a photovoltaic unit according to the grid frequency so as to participate in upward/downward grid frequency regulation.
In a first aspect, an embodiment of the present invention provides a grid frequency modulation control method involving photovoltaic power generation, where the grid frequency modulation control method includes:
s1: establishing a photovoltaic array offline model;
s2: obtaining a corresponding relation between a photovoltaic vibration reduction rate and a photovoltaic physical parameter according to the established photovoltaic array offline model, wherein the photovoltaic physical parameter comprises photovoltaic power and a slope of a curve formed by the photovoltaic power and photovoltaic direct-current voltage;
s3: in the actual operation of a power station, measuring and calculating the photovoltaic array temperature, the photovoltaic illumination intensity and the photovoltaic vibration attenuation rate reference value;
s4: bringing the photovoltaic array temperature, the photovoltaic illumination intensity and the photovoltaic damping rate reference value into an established photovoltaic array model to obtain a corresponding relation between the photovoltaic damping rate reference value and a photovoltaic reference physical parameter, wherein the photovoltaic reference physical parameter comprises photovoltaic reference power and a slope of a curve formed by the photovoltaic reference power and photovoltaic reference direct-current voltage;
s5: and adjusting the current voltage value of the power grid through a power tracking algorithm according to the corresponding relation between the photovoltaic load shedding rate reference value and the photovoltaic reference physical parameter.
Preferably, the first and second electrodes are formed of a metal,
step S1 specifically includes:
and establishing a photovoltaic output current array offline model, a photoproduction current array offline model, a diode reverse saturation current array offline model, a photovoltaic array open-circuit voltage array offline model and a photovoltaic voltage array offline model.
Preferably, the first and second electrodes are formed of a metal,
the expression of the photovoltaic output current array offline model is as follows:
Figure BDA0002013988690000021
the expression of the photo-generated current array offline model is as follows:
Figure BDA0002013988690000022
the expression of the diode reverse saturation current array offline model is as follows:
Figure BDA0002013988690000023
the expression of the photovoltaic array open-circuit voltage array offline model is as follows:
Figure BDA0002013988690000024
the expression of the photovoltaic voltage array offline model is as follows:
VT＝AkT/q
wherein, IPVOutputting current for photovoltaic; i isphIs a photo-generated current; i is0Is a diode reverse saturation current; vPVA photovoltaic voltage; rSIs a series resistor; vTIs a photovoltaic voltage; rshIs a parallel resistor; a is the ideal factor of the diode; k is Boltzmann constant; t is the temperature of the photovoltaic array; q is the electronic electricity quantity; g is the illumination intensity; gSTCThe illumination intensity under standard test conditions; t, TSTCIs the temperature under standard test conditions; i isSTCShort circuit current under standard test conditions; vOC,STCOpen circuit voltage under standard test conditions, and thermal correlation coefficients α, β.
Preferably, the first and second electrodes are formed of a metal,
the corresponding relation between the photovoltaic vibration reduction rate and the slope of the photovoltaic power-photovoltaic direct current voltage curve is as follows:
Figure BDA0002013988690000031
in a second aspect, an embodiment of the present invention provides a grid frequency modulation control device for photovoltaic power generation, where the grid frequency modulation control device includes: a model establishing module, a relation establishing module, a data measuring and calculating module, a relation optimizing module and a voltage regulating and controlling module, wherein,
the model establishing module is used for establishing a photovoltaic array offline model;
the relation establishing module is used for obtaining a corresponding relation between the photovoltaic vibration reduction rate and photovoltaic physical parameters according to the established photovoltaic array off-line model, wherein the photovoltaic physical parameters comprise photovoltaic power and a slope of a curve formed by the photovoltaic power and photovoltaic direct-current voltage;
the data measuring and calculating module is used for measuring and calculating the photovoltaic array temperature, the photovoltaic illumination intensity and the photovoltaic vibration damping rate reference value in the actual operation of the power station;
the relation optimization module is used for bringing the photovoltaic array temperature, the photovoltaic illumination intensity and the photovoltaic damping rate reference value into an established photovoltaic array model to obtain a corresponding relation between the photovoltaic damping rate reference value and a photovoltaic reference physical parameter, wherein the photovoltaic reference physical parameter comprises photovoltaic reference power and a slope of a curve formed by the photovoltaic reference power and photovoltaic reference direct-current voltage;
and the voltage regulation and control module is used for regulating the current voltage value of the power grid through a power tracking algorithm according to the corresponding relation between the photovoltaic load shedding rate reference value and the photovoltaic reference physical parameter.
Preferably, the first and second electrodes are formed of a metal,
the model establishing module is specifically used for establishing a photovoltaic output current array offline model, a photo-generated current array offline model, a diode reverse saturation current array offline model, a photovoltaic array open-circuit voltage array offline model and a photovoltaic voltage array offline model.
Preferably, the first and second electrodes are formed of a metal,
the expression of the photovoltaic output current array offline model is as follows:
Figure BDA0002013988690000041
the expression of the photo-generated current array offline model is as follows:
Figure BDA0002013988690000042
the expression of the diode reverse saturation current array offline model is as follows:
Figure BDA0002013988690000043
the expression of the photovoltaic array open-circuit voltage array offline model is as follows:
Figure BDA0002013988690000044
the expression of the photovoltaic voltage array offline model is as follows:
VT＝AkT/q
wherein, IPVOutputting current for photovoltaic; i isphIs a photo-generated current; i is0Is a diode reverse saturation current; vPVA photovoltaic voltage; rSIs a series resistor; vTIs a photovoltaic voltage; rshIs a parallel resistor; a is the ideal factor of the diode; k is Boltzmann constant; t is the temperature of the photovoltaic array; q is the electronic electricity quantity; g is the illumination intensity; gSTCThe illumination intensity under standard test conditions; t, TSTCIs the temperature under standard test conditions; i isSTCShort circuit current under standard test conditions; vOC,STCOpen circuit voltage under standard test conditions, and thermal correlation coefficients α, β.
Preferably, the first and second electrodes are formed of a metal,
the corresponding relation between the photovoltaic vibration reduction rate and the slope of the photovoltaic power-photovoltaic direct current voltage curve is as follows:
Figure BDA0002013988690000045
in a third aspect, the embodiment of the present invention provides a readable medium, where the readable medium includes an execution instruction, and when a processor of an electronic device executes the execution instruction, the electronic device executes the grid frequency modulation control method involving photovoltaic power generation according to any one of the first aspect.
In a fourth aspect, an embodiment of the present invention provides an electronic device, including: a processor, a memory, and a bus; the storage is used for storing execution instructions, the processor is connected with the storage through the bus, and when the electronic device runs, the processor executes the execution instructions stored in the storage, so that the processor executes the grid frequency modulation control method involving photovoltaic power generation according to any one of the first aspect.
Compared with the prior art, the invention has at least the following beneficial effects:
the method improves the fault tolerance of load shedding control by combining offline fitting and online tracking, can be seamlessly fused with the conventional maximum power tracking method, and can change the load shedding operation level of the photovoltaic unit according to the power grid frequency so as to participate in upward/downward power grid frequency regulation.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for controlling frequency modulation of a power grid in which photovoltaic power generation participates according to an embodiment of the present invention;
FIG. 2 is a diagram of a photovoltaic power generation participating circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a grid frequency modulation control device with photovoltaic power generation participation according to an embodiment of the present invention;
fig. 4 is an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete, the technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention, and based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a grid frequency modulation control method with photovoltaic power generation, where the method may include the following steps:
s1: establishing a photovoltaic array offline model;
s2: obtaining a corresponding relation between a photovoltaic vibration reduction rate and a photovoltaic physical parameter according to the established photovoltaic array offline model, wherein the photovoltaic physical parameter comprises photovoltaic power and a slope of a curve formed by the photovoltaic power and photovoltaic direct-current voltage; s3: in the actual operation of a power station, measuring and calculating the photovoltaic array temperature, the photovoltaic illumination intensity and the photovoltaic vibration attenuation rate reference value;
s4: bringing the photovoltaic array temperature, the photovoltaic illumination intensity and the photovoltaic damping rate reference value into an established photovoltaic array model to obtain a corresponding relation between the photovoltaic damping rate reference value and a photovoltaic reference physical parameter, wherein the photovoltaic reference physical parameter comprises photovoltaic reference power and a slope of a curve formed by the photovoltaic reference power and photovoltaic reference direct-current voltage;
s5: and adjusting the current voltage value of the power grid through a power tracking algorithm according to the corresponding relation between the photovoltaic load shedding rate reference value and the photovoltaic reference physical parameter.
In this embodiment, the control strategy is mainly divided into three parts, a frequency response layer, a load shedding control layer and a voltage control layer. The main function of the frequency response layer is to change the power output of the photovoltaic array according to the grid frequency, so that the photovoltaic power generation system can generate frequency modulation response similar to that of a traditional generator set. The core function of the load shedding control layer is to convert the output of the frequency response layer into a photovoltaic array direct-current voltage reference value. The voltage control layer adopts a double-loop control strategy of a direct-current voltage outer loop and an inductive current inner loop.
In an embodiment of the present invention, step S1 specifically includes:
and establishing a photovoltaic output current array offline model, a photoproduction current array offline model, a diode reverse saturation current array offline model, a photovoltaic array open-circuit voltage array offline model and a photovoltaic voltage array offline model.
In an embodiment of the present invention, an expression of the photovoltaic output current array offline model is as follows:
Figure BDA0002013988690000061
the expression of the photo-generated current array offline model is as follows:
Figure BDA0002013988690000071
the expression of the diode reverse saturation current array offline model is as follows:
Figure BDA0002013988690000072
the expression of the photovoltaic array open-circuit voltage array offline model is as follows:
Figure BDA0002013988690000073
the expression of the photovoltaic voltage array offline model is as follows:
VT＝AkT/q
wherein, IPVOutputting current for photovoltaic; i isphIs a photo-generated current; i is0Is a diode reverse saturation current; vPVA photovoltaic voltage; rSIs a series resistor; vTIs a photovoltaic voltage; rshIs a parallel resistor; a is the ideal factor of the diode; k is Boltzmann constant; t is the temperature of the photovoltaic array; q is the electronic electricity quantity; g is the illumination intensity; gSTCThe illumination intensity under standard test conditions; t, TSTCIs the temperature under standard test conditions; i isSTCShort circuit current under standard test conditions; vOC,STCOpen circuit voltage under standard test conditions, and thermal correlation coefficients α, β.
In an embodiment of the present invention, a corresponding relationship between the photovoltaic damping rate and the slope of the photovoltaic power-photovoltaic dc voltage curve is:
Figure BDA0002013988690000074
in this embodiment, the photovoltaic circuit may refer to fig. 2. The corresponding relation between the photovoltaic vibration reduction rate d% and the slope dp/dv of the photovoltaic power-photovoltaic direct-current voltage curve is as follows:
Figure BDA0002013988690000075
Figure BDA0002013988690000076
Figure BDA0002013988690000077
in this embodiment, the offline portion is obtained by data analysis of the photovoltaic array model
Figure BDA0002013988690000081
The relational expression (c) of (c). In the online part, the estimated photovoltaic illumination intensity and the output (d%) of the frequency response layer are substituted into the simulation (initial) load shedding rate through the measured photovoltaic array temperature information
Figure BDA0002013988690000082
And (dp/dv) corresponding to the load shedding rate reference value (d%) is obtained by the relational expression. And tracking a voltage reference value v dc corresponding to (dp/dv) on line through a power tracking algorithm. The (dp/dv) is introduced as an intermediate variable, instead of directly judging the relation between the load shedding rate and the voltage reference value, so that the error frequency modulation response caused by the inaccuracy of an offline model is avoided. The offline fitting relational expression has inevitable error with an actual system under the influence of power loss, inaccurate model parameters and the like, and if the offline fitting relational expression is directly fitted, the error is
Figure BDA0002013988690000083
When the curve relationship is inaccurate, it is possible that the operation condition across the maximum power point occurs with the change of (d%), which will result in the occurrence of wrong frequency modulation response.
In addition to this, the present invention is,
Figure BDA0002013988690000084
the coefficients in the fitting function of (a) are affected by the intensity of illumination and the temperature of the external environment. In practical applications, the cost of the sensor and the complexity of the algorithm can be considered in a trade-off mode. An online illumination intensity estimation method is used, and the ambient temperature is directly measured by a sensor.
In this embodiment, the power tracking algorithm defines the power offset Δ Ppv＝Ppv(k)-Ppv(k-1)-(dp/dv)*·ΔvpvWhere k denotes the current sampling instant, k-1 denotes the previous sampling instant, and Δ v denotes the perturbation step size. By judging whether the power change caused by the current disturbance is larger than a given value (dp/dv)*·ΔvpvThe direction of the disturbance is determined, if the disturbance direction is larger than the disturbance direction, the voltage output is increased, and if the disturbance direction is smaller than the disturbance direction, the voltage output is decreased.
As shown in fig. 3, an embodiment of the present invention provides a grid frequency modulation control apparatus with photovoltaic power generation, where the grid frequency modulation control apparatus includes: a model establishing module, a relation establishing module, a data measuring and calculating module, a relation optimizing module and a voltage regulating and controlling module, wherein,
the model establishing module is used for establishing a photovoltaic array offline model;
the relation establishing module is used for obtaining a corresponding relation between the photovoltaic vibration reduction rate and photovoltaic physical parameters according to the established photovoltaic array off-line model, wherein the photovoltaic physical parameters comprise photovoltaic power and a slope of a curve formed by the photovoltaic power and photovoltaic direct-current voltage;
the data measuring and calculating module is used for measuring and calculating the photovoltaic array temperature, the photovoltaic illumination intensity and the photovoltaic vibration damping rate reference value in the actual operation of the power station;
the relation optimization module is used for bringing the photovoltaic array temperature, the photovoltaic illumination intensity and the photovoltaic damping rate reference value into an established photovoltaic array model to obtain a corresponding relation between the photovoltaic damping rate reference value and a photovoltaic reference physical parameter, wherein the photovoltaic reference physical parameter comprises photovoltaic reference power and a slope of a curve formed by the photovoltaic reference power and photovoltaic reference direct-current voltage;
and the voltage regulation and control module is used for regulating the current voltage value of the power grid through a power tracking algorithm according to the corresponding relation between the photovoltaic load shedding rate reference value and the photovoltaic reference physical parameter.
In an embodiment of the present invention, the model establishing module is specifically configured to establish a photovoltaic output current array offline model, a photo-generated current array offline model, a diode reverse saturation current array offline model, a photovoltaic array open-circuit voltage array offline model, and a photovoltaic voltage array offline model.
In an embodiment of the present invention, an expression of the photovoltaic output current array offline model is as follows:
Figure BDA0002013988690000091
the expression of the photo-generated current array offline model is as follows:
Figure BDA0002013988690000092
the expression of the diode reverse saturation current array offline model is as follows:
Figure BDA0002013988690000093
the expression of the photovoltaic array open-circuit voltage array offline model is as follows:
Figure BDA0002013988690000094
the expression of the photovoltaic voltage array offline model is as follows:
VT＝AkT/q
wherein, IPVOutputting current for photovoltaic; i isphIs a photo-generated current; i is0Is a diode reverse saturation current; vPVA photovoltaic voltage; rSIs a series resistor; vTIs a photovoltaic voltage; rshIs a parallel resistor; a is the ideal factor of the diode; k is Boltzmann constant; t is the temperature of the photovoltaic array; q is the electronic electricity quantity; g is the illumination intensity; gSTCThe illumination intensity under standard test conditions; t, TSTCIs the temperature under standard test conditions; i isSTCShort circuit current under standard test conditions; vOC,STCOpen circuit voltage under standard test conditions, and thermal correlation coefficients α, β.
In an embodiment of the present invention, a corresponding relationship between the photovoltaic damping rate and the slope of the photovoltaic power-photovoltaic dc voltage curve is:
Figure BDA0002013988690000101
because the content of information interaction, execution process, and the like among the modules in the device is based on the same concept as the method embodiment of the present invention, specific content can be referred to the description in the method embodiment of the present invention, and is not described herein again.
As shown in fig. 4, one embodiment of the present invention provides an electronic device. On the hardware level, the electronic device comprises a processor and optionally an internal bus, a network interface and a memory. The Memory may include a Memory, such as a Random-Access Memory (RAM), and may further include a non-volatile Memory, such as at least 1 disk Memory. Of course, the electronic device may also include hardware required for other services.
The processor, the network interface, and the memory may be connected to each other via an internal bus, which may be an ISA (Industry Standard Architecture) bus, a PCI (peripheral component Interconnect) bus, an EISA (Extended Industry Standard Architecture) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one double-headed arrow is shown in FIG. 4, but that does not indicate only one bus or one type of bus.
And the memory is used for storing programs. In particular, the program may include program code comprising computer operating instructions. The memory may include both memory and non-volatile storage and provides instructions and data to the processor. In a possible implementation manner, the processor reads the corresponding computer program from the nonvolatile memory into the memory and then runs the computer program, and the corresponding computer program can also be obtained from other equipment, so as to form the grid frequency modulation control device participating in photovoltaic power generation on a logic level. And the processor executes the program stored in the memory so as to realize the grid frequency modulation control method with participation of photovoltaic power generation provided by any embodiment of the invention through the executed program.
The method executed by the grid frequency modulation control device participating in photovoltaic power generation according to the embodiment of the invention shown in fig. 3 can be applied to or implemented by a processor. The processor may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The Processor may be a general-purpose Processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; but also Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The steps of the method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor.
Embodiments of the present invention also provide a computer-readable storage medium storing one or more programs, where the one or more programs include instructions, which when executed by an electronic device including a plurality of application programs, enable the electronic device to execute the grid frequency modulation control method involving photovoltaic power generation provided in any embodiment of the present invention.
The apparatuses, modules or units illustrated in the above embodiments may be implemented by a computer chip or an entity, or implemented by a product with certain functions. One typical implementation device is a computer. In particular, the computer may be, for example, a personal computer, a laptop computer, a cellular telephone, a camera phone, a smartphone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.
For convenience of description, the above devices are described as being divided into various units or modules by function, respectively. Of course, the functionality of the units or modules may be implemented in the same one or more software and/or hardware when implementing the invention.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a" does not exclude the presence of other similar elements in a process, method, article, or apparatus that comprises the element.
Those of ordinary skill in the art will understand that: all or part of the steps for realizing the method embodiments can be completed by hardware related to program instructions, the program can be stored in a computer readable storage medium, and the program executes the steps comprising the method embodiments when executed; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it is to be noted that: the above description is only a preferred embodiment of the present invention, and is only used to illustrate the technical solutions of the present invention, and not to limit the protection scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims (10)

1. A grid frequency modulation control method with participation of photovoltaic power generation is characterized by comprising the following steps:
s1: establishing a photovoltaic array offline model;
s2: obtaining a corresponding relation between a photovoltaic vibration reduction rate and a photovoltaic physical parameter according to the established photovoltaic array offline model, wherein the photovoltaic physical parameter comprises photovoltaic power and a slope of a curve formed by the photovoltaic power and photovoltaic direct-current voltage;
s3: in the actual operation of a power station, measuring and calculating the photovoltaic array temperature, the photovoltaic illumination intensity and the photovoltaic vibration attenuation rate reference value;
s4: bringing the photovoltaic array temperature, the photovoltaic illumination intensity and the photovoltaic damping rate reference value into an established photovoltaic array model to obtain a corresponding relation between the photovoltaic damping rate reference value and a photovoltaic reference physical parameter, wherein the photovoltaic reference physical parameter comprises photovoltaic reference power and a slope of a curve formed by the photovoltaic reference power and photovoltaic reference direct-current voltage;
s5: and adjusting the current voltage value of the power grid through a power tracking algorithm according to the corresponding relation between the photovoltaic load shedding rate reference value and the photovoltaic reference physical parameter.
2. The grid frequency modulation control method for photovoltaic power generation participation according to claim 1, wherein the step S1 specifically includes:
and establishing a photovoltaic output current array offline model, a photoproduction current array offline model, a diode reverse saturation current array offline model, a photovoltaic array open-circuit voltage array offline model and a photovoltaic voltage array offline model.
3. Grid frequency modulation control method with participation of photovoltaic power generation according to claim 2,
the expression of the photovoltaic output current array offline model is as follows:
Figure FDA0002013988680000011
the expression of the photo-generated current array offline model is as follows:
Figure FDA0002013988680000012
the expression of the diode reverse saturation current array offline model is as follows:
Figure FDA0002013988680000021
the expression of the photovoltaic array open-circuit voltage array offline model is as follows:
Figure FDA0002013988680000022
the expression of the photovoltaic voltage array offline model is as follows:
VT＝AkT/q
wherein, IPVOutputting current for photovoltaic; i isphIs a photo-generated current; i is0Is a diode reverse saturation current; vPVA photovoltaic voltage; rSIs a series resistor; vTIs a photovoltaic voltage; rshIs a parallel resistor; a is the ideal factor of the diode; k is Boltzmann constant; t is the temperature of the photovoltaic array; q is the electronic electricity quantity; g is the illumination intensity; gSTCThe illumination intensity under standard test conditions; t, TSTCIs the temperature under standard test conditions; i isSTCShort circuit current under standard test conditions; vOC,STCOpen circuit voltage under standard test conditions, and thermal correlation coefficients α, β.
4. A grid frequency modulation control method with participation of photovoltaic power generation according to claim 3, wherein the corresponding relation between the photovoltaic damping rate and the slope of the photovoltaic power-photovoltaic direct current voltage curve is as follows:
Figure FDA0002013988680000023
5. a grid frequency modulation control device that photovoltaic power generation participates in, its characterized in that, this grid frequency modulation control device includes: a model establishing module, a relation establishing module, a data measuring and calculating module, a relation optimizing module and a voltage regulating and controlling module, wherein,
the model establishing module is used for establishing a photovoltaic array offline model;
the relation establishing module is used for obtaining a corresponding relation between the photovoltaic vibration reduction rate and photovoltaic physical parameters according to the established photovoltaic array off-line model, wherein the photovoltaic physical parameters comprise photovoltaic power and a slope of a curve formed by the photovoltaic power and photovoltaic direct-current voltage;
the data measuring and calculating module is used for measuring and calculating the photovoltaic array temperature, the photovoltaic illumination intensity and the photovoltaic vibration damping rate reference value in the actual operation of the power station;
the relation optimization module is used for bringing the photovoltaic array temperature, the photovoltaic illumination intensity and the photovoltaic damping rate reference value into an established photovoltaic array model to obtain a corresponding relation between the photovoltaic damping rate reference value and a photovoltaic reference physical parameter, wherein the photovoltaic reference physical parameter comprises photovoltaic reference power and a slope of a curve formed by the photovoltaic reference power and photovoltaic reference direct-current voltage;
the voltage regulation and control module is used for regulating the current voltage value of the power grid through a power tracking algorithm according to the corresponding relation between the photovoltaic load shedding rate reference value and the photovoltaic reference physical parameter
6. The grid frequency-modulation control device according to claim 5, wherein the model building module is specifically configured to build a photovoltaic output current array offline model, a photo-generated current array offline model, a diode reverse saturation current array offline model, a photovoltaic array open-circuit voltage array offline model, and a photovoltaic voltage array offline model.
7. Grid frequency modulation control apparatus participating in photovoltaic power generation according to claim 6,
the expression of the photovoltaic output current array offline model is as follows:
Figure FDA0002013988680000031
the expression of the photo-generated current array offline model is as follows:
Figure FDA0002013988680000032
the expression of the diode reverse saturation current array offline model is as follows:
Figure FDA0002013988680000033
the expression of the photovoltaic array open-circuit voltage array offline model is as follows:
Figure FDA0002013988680000034
the expression of the photovoltaic voltage array offline model is as follows:
VT＝AkT/q
wherein, IPVOutputting current for photovoltaic; i isphIs a photo-generated current; i is0Is a diode reverse saturation current; vPVA photovoltaic voltage; rSIs a series resistor; vTIs a photovoltaic voltage; rshIs a parallel resistor; a is the ideal factor of the diode; k is Boltzmann constant; t is the temperature of the photovoltaic array; q is the electronic electricity quantity; g is the illumination intensity; gSTCThe illumination intensity under standard test conditions; t, TSTCIs the temperature under standard test conditions; i isSTCShort circuit current under standard test conditions; vOC,STCOpen circuit voltage under standard test conditions, and thermal correlation coefficients α, β.
8. A grid frequency modulation control device with participation of photovoltaic power generation according to claim 7, wherein the corresponding relation between the photovoltaic damping rate and the slope of the photovoltaic power-photovoltaic direct current voltage curve is as follows:
Figure FDA0002013988680000041
9. a readable medium, characterized in that the readable medium comprises an execution instruction, when the execution instruction is executed by a processor of an electronic device, the electronic device executes the grid frequency modulation control method with participation of photovoltaic power generation according to any one of claims 1 to 4.
10. An electronic device, comprising: a processor, a memory, and a bus; the memory is used for storing execution instructions, the processor is connected with the memory through the bus, and when the electronic device runs, the processor executes the execution instructions stored in the memory, so that the processor executes the grid frequency modulation control method with participation of photovoltaic power generation according to any one of claims 1 to 4.
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