A method and device for calculating the current input of a DSSC electronic power device

Abstract

The application discloses a DSSC electronic power equipment injection current calculation method and device. The method comprises the following steps: establishing a power flow model of the DSSC electronic power equipment and performing power flow calculation to obtain active power and reactive power output by the DSSC electronic power equipment; establishing a stability model of the DSSC electronic power equipment, wherein the stability model comprises a converter control model module, a power injection model module and a grid-connected interface model module; and inputting the active power and the reactive power into the stability model to calculate the injection current of the DSSC electronic power equipment.

Description

Technical Field

[0001] This invention relates to the field of electromechanical transient modeling technology, and more specifically, to a method and apparatus for calculating the injected current of DSSC electronic power equipment. Background Technology

[0002] In recent years, electromechanical transient simulation has become an indispensable research tool in exploring key technologies for flexible control and stability improvement of power systems. The distributed static series compensator (DSSC), as a novel power electronic device, has shown great potential in improving grid flexibility and stability due to its ability to achieve long-distance, high-efficiency power flow control and voltage regulation, thus becoming a focus of attention in academia and engineering.

[0003] DSSC can effectively regulate the power distribution of transmission lines and improve grid voltage quality without increasing the system's short-circuit capacity. Its typical applications include transmission line power optimization, regional grid interconnection, and microgrid energy management. These applications often require DSSC to have characteristics such as fast response, precise control, and high reliability to adapt to the complex and ever-changing power system operating environment.

[0004] In the research and application of DSSC (Dynamic Power Sinking) systems, electromechanical transient modeling methods are particularly important. Through electromechanical transient simulation, the behavior of DSSCs under various operating conditions can be simulated, including power flow regulation during normal operation, transient response during faults, and verification of the effectiveness of control strategies. Especially when analyzing the contribution of DSSCs to power system stability, electromechanical transient modeling methods can deeply reveal the mechanisms by which DSSCs suppress low-frequency oscillations, enhance system damping, and improve voltage stability. However, due to the complex structure of DSSC systems, which includes multiple converter units, filter banks, and complex control algorithms, electromechanical transient modeling faces many challenges, such as balancing model accuracy and computational efficiency, the dynamic adaptability of control strategies, and co-simulation with other components.

[0005] Therefore, designing an efficient and accurate DSSC electromechanical transient modeling method is of great significance for promoting the practical application of DSSC technology and improving the overall operating performance of power systems. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a method and apparatus for calculating the injected current of DSSC electronic power equipment.

[0007] According to one aspect of the present invention, a method for calculating the injected current of DSSC electronic power equipment is provided, comprising:

[0008] Establish a power flow model for the DSSC electronic power equipment and perform power flow calculations to obtain the active and reactive power output by the DSSC electronic power equipment.

[0009] Establish a stability model for DSSC electronic power equipment, which includes a converter control model module, a power injection model module, and a grid connection interface model module.

[0010] The active and reactive power are input into the stability model to calculate the injection current of the DSSC electronic power equipment.

[0011] Optionally, active and reactive power are input into the stability model to calculate the injection current of the DSSC electronic power equipment, including:

[0012] The active power, reactive power, and line active power reference values ​​of the system-level control model are input to the converter control model module, and the d-axis command and q-axis command of the limiting converter are output.

[0013] Input the d-axis command of the limiting converter, the q-axis command of the limiting converter, and the line active power reference value into the power injection model module, and output the equivalent injected active power at both ends of the DSSC electronic power equipment line;

[0014] The equivalent injected active power at both ends of the line and the voltage at both ends of the line are input to the grid-connected interface model module, and the injected current of the DSSC electronic power equipment is output.

[0015] Optionally, the active power, reactive power, and line active power reference values ​​from the system-level control model are input to the converter control model module, and the limiting converter d-axis commands and limiting converter q-axis commands are output, including:

[0016] The difference between the active power and the line active power reference value is passed through a PI regulator to obtain the converter voltage phasor.

[0017] The voltage phasor, with a 90° amplitude added or subtracted from the phase value of the line current of the DSSC electronic power equipment, is then decomposed into a d-axis component that is in phase with the voltage value at the beginning of the line and a q-axis component that is orthogonal to the voltage value at the beginning of the line through the DQ coordinate transformation.

[0018] The d-axis and q-axis components are passed through a voltage limiting circuit to obtain the limited d-axis and q-axis commands of the limited converter.

[0019] Optionally, the formula for calculating the equivalent injected active power at both ends of the line is:

[0020]

[0021] In the formula, Pi Inject active power into the beginning of the line; P j Inject active power into the end of the line; V l P' is the voltage value at the beginning of the line where the DSSC is located; l Q' is the active power at the beginning of the line. l X represents the reactive power at the beginning of the line. l This refers to the line reactance.

[0022] Optionally, the formula for calculating the injected current is:

[0023]

[0024]

[0025] In the formula, P i Inject active power into the beginning of the line; P j Inject active power into the end of the line; V lx V is the real part of the voltage at the beginning of the line; ly V represents the imaginary part of the voltage at the beginning of the line. rx V represents the real part of the voltage at the end of the line. ry I represents the imaginary part of the voltage at the end of the line. ix Inject the real part of the grid current into the beginning of the line; I iy Inject the imaginary part of the grid current into the beginning of the line; I jx Inject the real part of the grid current into the end of the line; I jy The imaginary part of the grid current is injected into the end of the line.

[0026] According to another aspect of the present invention, a DSSC electronic power equipment injection current calculation device is provided, comprising:

[0027] The first module is used to establish the power flow model of the DSSC electronic power equipment and perform power flow calculations to obtain the active and reactive power output by the DSSC electronic power equipment.

[0028] The second module is used to establish a stability model of the DSSC electronic power equipment, which includes a converter control model module, a power injection model module, and a grid connection interface model module.

[0029] The calculation module is used to input active and reactive power into the stability model to calculate the injection current of the DSSC electronic power equipment.

[0030] According to another aspect of the present invention, a computer-readable storage medium is provided, the storage medium storing a computer program for performing the methods described in any of the above aspects of the present invention.

[0031] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising: a processor; a memory for storing executable instructions of the processor; the processor being configured to read the executable instructions from the memory and execute the instructions to implement the method described in any of the preceding aspects of the present invention.

[0032] Therefore, this invention provides a method for calculating the injected current of DSSC electronic power equipment. By modeling the electromechanical electromagnetic transients of DSSC, the power flow regulation function of DSSC can be realized. By inputting a target command, the actual power flow value and the target value are processed through an appropriate closed-loop control method to generate the required modulation signal. Then, through feasible modulation technology, the switching signal controlling the IGBT to turn on and off is output, thereby controlling the main circuit to output the required voltage. Attached Figure Description

[0033] Exemplary embodiments of the present invention can be more fully understood by referring to the following figures:

[0034] Figure 1 This is a flowchart illustrating a method for calculating the injected current of a DSSC electronic power device according to an exemplary embodiment of the present invention.

[0035] Figure 2 This is an overall structural diagram of the DSSC model provided in an exemplary embodiment of the present invention;

[0036] Figure 3 This is a converter control model diagram provided by an exemplary embodiment of the present invention;

[0037] Figure 4 This is a power injection calculation model diagram provided by an exemplary embodiment of the present invention;

[0038] Figure 5 This is a CEPRI-36 test system with DSSC grid connection provided by an exemplary embodiment of the present invention;

[0039] Figure 6 This is a schematic diagram of the active power curve of the line where the DSSC is located, provided in an exemplary embodiment of the present invention;

[0040] Figure 7 This is a schematic diagram of the structure of a DSSC electronic power equipment injection current calculation device provided in an exemplary embodiment of the present invention;

[0041] Figure 8 This is the structure of an electronic device provided in an exemplary embodiment of the present invention. Detailed Implementation

[0042] Hereinafter, exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments of the present invention. It should be understood that the present invention is not limited to the exemplary embodiments described herein.

[0043] It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention.

[0044] Those skilled in the art will understand that the terms "first," "second," etc., in the embodiments of the present invention are only used to distinguish different steps, devices, or modules, and do not represent any specific technical meaning, nor do they indicate a necessary logical order between them.

[0045] It should also be understood that in the embodiments of the present invention, "multiple" can refer to two or more, and "at least one" can refer to one, two or more.

[0046] It should also be understood that any component, data or structure mentioned in the embodiments of the present invention can generally be understood as one or more unless explicitly defined or given contrary instructions in the context.

[0047] Furthermore, the term "and / or" in this invention is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this invention generally indicates that the preceding and following related objects have an "or" relationship.

[0048] It should also be understood that the description of the various embodiments in this invention emphasizes the differences between the various embodiments, and the similarities or similarities can be referred to each other. For the sake of brevity, they will not be described in detail.

[0049] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0050] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0051] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0052] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0053] The embodiments of this invention can be applied to electronic devices such as terminal devices, computer systems, and servers, and can operate together with a wide range of other general-purpose or special-purpose computing system environments or configurations. Well-known examples of terminal devices, computing systems, environments, and / or configurations suitable for use with electronic devices such as terminal devices, computer systems, and servers include, but are not limited to: personal computer systems, server computer systems, thin clients, thick clients, handheld or laptop devices, microprocessor-based systems, set-top boxes, programmable consumer electronics, network PCs, minicomputer systems, mainframe computer systems, and distributed cloud computing environments including any of the above systems, etc.

[0054] Electronic devices such as terminal devices, computer systems, and servers can be described in the general context of computer system executable instructions (such as program modules) executed by a computer system. Typically, program modules can include routines, programs, object programs, components, logic, data structures, etc., which perform specific tasks or implement specific abstract data types. Computer systems / servers can be implemented in distributed cloud computing environments, where tasks are executed by remote processing devices linked through communication networks. In distributed cloud computing environments, program modules can reside on local or remote computing system storage media, including storage devices.

[0055] Exemplary methods

[0056] Figure 1 This is a flowchart illustrating a method for calculating the injected current of a DSSC electronic power device according to an exemplary embodiment of the present invention. This embodiment can be applied to electronic devices, such as... Figure 1 As shown, the DSSC electronic power equipment injection current calculation method 100 includes the following steps:

[0057] Step 101: Establish a power flow model for the DSSC electronic power equipment and perform power flow calculations to obtain the active and reactive power output by the DSSC electronic power equipment.

[0058] Step 102: Establish a stability model for the DSSC electronic power equipment, which includes a converter control model module, a power injection model module, and a grid connection interface model module.

[0059] Step 103: Input the active power and reactive power into the stability model to calculate the injection current of the DSSC electronic power equipment.

[0060] Specifically, the purpose of this invention is to provide an electromechanical and electromagnetic transient modeling method for DSSC. This method can realize the power flow control function of DSSC. By inputting a target command, the actual power flow value and the target value are processed through an appropriate closed-loop control method to generate the required modulation signal. Then, through feasible modulation technology, the switching signal controlling the IGBT to turn on and off is output, thereby controlling the main circuit to output the required voltage.

[0061] An electromechanical transient modeling method based on DSSC, characterized in that the method includes the following steps:

[0062] 1. Establish the DSSC power flow model. Set the DSSC grid-connected node as a PQ node, with output power of Pe and Q. i ;

[0063] 2. Establishing the DSSC stability model includes the following steps: converter control model module, power injection model module, and grid connection interface model module. The overall structure of the DSSC electromechanical transient model is as follows: Figure 1 As shown. (Through) Figure 2 The control in the process is ultimately converted into injected current, achieving DSSC transient stability control. In the diagram: P ref P is the line active power reference command. e The active power measured on the line; θ i This is the measured value of the line current phase; V d For converter voltage d-axis command; V q For converter voltage q-axis command; S j V is the injected power; l V r I represents the line terminal voltage; I represents the line current injected by the DSSC.

[0064] 2.1 Converter control module, such as Figure 3 As shown. Active power is controlled using PI control, and the active power command for converter power control comes from the system-level control signal. The process includes the following steps:

[0065] 2.1.1 Based on the power flow calculation results, read the measured value P of the line active power. e and the line active power reference command P ref The difference is passed through a PI controller (where K p_p K is the active power PI control proportional coefficient. i_p V is the integral time constant of the active PI control. semax This refers to the maximum value of the converter voltage amplitude command; V semin (The minimum value of the converter voltage amplitude command) is used to obtain the converter voltage phasor. The amplitude.

[0066] 2.1.2 Read the line current phase measurement value θ i , θ i Adding or subtracting 90° voltage phasors The angle, after DQ coordinate transformation, transforms the voltage phasor. Decomposed into the voltage V at the beginning of the line l In-phase d-axis component V d Its main control The amplitude, and its relationship with V l Orthogonal q-axis components V q Its main control The phase angle is determined by changing V. d and V q The magnitudes are used to control the active and reactive power on the line, respectively.

[0067] 2.1.3 After voltage limiting, the limited converter d-axis command V' is obtained. d The converter q-axis command V' after limiting q (in (This refers to the converter voltage phase).

[0068] 2.2 Power Injection Model Module. In the electromechanical transient model, the active power at both ends of the injected line is used as the model output. To facilitate the calculation of the injected power, the line's susceptance is ignored in the power injection model. The equivalent power injection model of the distributed power flow controller is as follows: Figure 4 As shown. Includes the following steps:

[0069] Using the limited converter d-axis command V' d q-axis command V' q Line active power command value P ref Calculate the equivalent injected active power P of DSSC. i P j The calculation formula is as follows.

[0070]

[0071] In the formula: P i Inject active power into the beginning of the line; P j Inject active power into the end of the line; V l P' is the voltage at the starting node of the line where the DSSC is located; l Q' is the active power at the beginning of the line. l X represents the reactive power at the beginning of the line. l This refers to the line reactance.

[0072] 2.3 Grid-connected interface model module. Utilizing the equivalent injected power P at both ends of the DSSC line. i P j and the voltage V at both ends of the linel V r The DSSC equivalent injected power is converted into the real part I of the injected grid current vector required for grid-connected calculations. jx and the imaginary part I jy The calculation formula is as follows.

[0073]

[0074]

[0075] In the formula: P i Inject active power into the beginning of the line; P j Inject active power into the end of the line; V lx V is the real part of the voltage at the beginning of the line; ly V represents the imaginary part of the voltage at the beginning of the line. rx V represents the real part of the voltage at the end of the line. ry I represents the imaginary part of the voltage at the end of the line. ix Inject the real part of the grid current into the beginning of the line; I iy Inject the imaginary part of the grid current into the beginning of the line; I jx Inject the real part of the grid current into the end of the line; I jy The imaginary part of the grid current is injected into the end of the line.

[0076] In one embodiment of the present invention, taking a user-defined model based on the PSASP electromechanical transient simulation program as an example, the implementation steps of electromechanical transients for DSSC are described:

[0077] First, a DSSC power flow model was established. Results from the CEPRI-36 standard test system are attached. Figure 5 As shown, DSSC access node B33 is set as a PQ node for power flow calculation.

[0078] The active power reference signal provides a step signal of -50MW at 3s and stops at 6s. Figure 6 The simulation curves of the active power transmitted by the line where the DSSC is located are shown. The response of the DSSC model accurately reflects its dynamic characteristics.

[0079] Therefore, this invention provides a method for calculating the injected current of DSSC electronic power equipment. By modeling the electromechanical electromagnetic transients of DSSC, the power flow regulation function of DSSC can be realized. By inputting a target command, the actual power flow value and the target value are processed through an appropriate closed-loop control method to generate the required modulation signal. Then, through feasible modulation technology, the switching signal controlling the IGBT to turn on and off is output, thereby controlling the main circuit to output the required voltage.

[0080] Exemplary device

[0081] Figure 7 This is a schematic diagram of the structure of a DSSC electronic power equipment injection current calculation device provided in an exemplary embodiment of the present invention. Figure 7 As shown, the device 700 includes:

[0082] The first module 710 is used to establish a power flow model of the DSSC electronic power equipment and perform power flow calculations to obtain the active power and reactive power output by the DSSC electronic power equipment.

[0083] The second module 720 is used to establish a stability model of the DSSC electronic power equipment, wherein the stability model includes a converter control model module, a power injection model module, and a grid connection interface model module.

[0084] The calculation module 730 is used to input active and reactive power into the stability model to calculate the injection current of the DSSC electronic power equipment.

[0085] Optionally, the computing module 730 includes:

[0086] The first output submodule is used to input the active power, reactive power and the line active power reference value of the system-level control model to the converter control model module, and output the d-axis command and q-axis command of the limiting converter.

[0087] The second output submodule is used to input the d-axis command of the limiting converter, the q-axis command of the limiting converter, and the line active power reference value to the power injection model module, and output the equivalent injected active power at both ends of the DSSC electronic power equipment line.

[0088] The third output submodule is used to input the equivalent injected active power at both ends of the line and the voltage value at both ends of the line into the grid-connected interface model module, and output the injection current of the DSSC electronic power equipment.

[0089] Optionally, the first output submodule includes:

[0090] The unit is used to obtain the converter voltage phasor by passing the difference between the active power and the line active power reference value through a PI regulator;

[0091] The decomposition unit is used to add or subtract 90° amplitude from the phase value of the line current of the DSSC electronic power equipment, and then decompose the voltage phasor into a d-axis component that is in phase with the voltage value at the beginning of the line and a q-axis component that is orthogonal to the voltage value at the beginning of the line through DQ coordinate transformation.

[0092] The acquisition unit is used to pass the d-axis component and q-axis component through a voltage limiting circuit to obtain the limited d-axis command and q-axis command of the limited converter.

[0093] Optionally, the formula for calculating the equivalent injected active power at both ends of the line is:

[0094]

[0095] In the formula, P i Inject active power into the beginning of the line; P j Inject active power into the end of the line; V l P' is the voltage value at the beginning of the line where the DSSC is located; l Q' is the active power at the beginning of the line. l X represents the reactive power at the beginning of the line. l This refers to the line reactance.

[0096] Optionally, the formula for calculating the injected current is:

[0097]

[0098]

[0099] In the formula, P i Inject active power into the beginning of the line; P j Inject active power into the end of the line; V lx V is the real part of the voltage at the beginning of the line; ly V represents the imaginary part of the voltage at the beginning of the line. rx V represents the real part of the voltage at the end of the line. ry I represents the imaginary part of the voltage at the end of the line. ix Inject the real part of the grid current into the beginning of the line; I iy Inject the imaginary part of the grid current into the beginning of the line; I jx Inject the real part of the grid current into the end of the line; I jy The imaginary part of the grid current is injected into the end of the line.

[0100] Exemplary electronic devices

[0101] Figure 8 This is the structure of an electronic device provided in an exemplary embodiment of the present invention. For example... Figure 8 As shown, the electronic device 80 includes one or more processors 81 and memory 82.

[0102] The processor 81 may be a central processing unit (CPU) or other form of processing unit with data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device to perform desired functions.

[0103] The memory 82 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 81 may execute the program instructions to implement the methods of the software programs of the various embodiments of the present invention described above, and / or other desired functions. In one example, the electronic device may also include an input device 83 and an output device 84, these components being interconnected via a bus system and / or other forms of connection mechanisms (not shown).

[0104] In addition, the input device 83 may also include, for example, a keyboard, a mouse, etc.

[0105] The output device 84 can output various information to the outside. The output device 84 may include, for example, a display, a speaker, a printer, and a communication network and its connected remote output devices, etc.

[0106] Of course, for the sake of simplicity, Figure 8 Only some of the components of this electronic device relevant to the present invention are shown, omitting components such as buses, input / output interfaces, etc. In addition, the electronic device may include any other suitable components depending on the specific application.

[0107] Exemplary computer program products and computer-readable storage media

[0108] In addition to the methods and apparatus described above, embodiments of the present invention may also be computer program products, which include computer program instructions that, when executed by a processor, cause the processor to perform the steps in the methods according to various embodiments of the present invention described in the "Exemplary Methods" section above.

[0109] The computer program product can be written in any combination of one or more programming languages ​​to perform the operations of the embodiments of the present invention. The programming languages ​​include object-oriented programming languages ​​such as Java and C++, as well as conventional procedural programming languages ​​such as C or similar languages. The program code can be executed entirely on the user's computing device, partially on the user's computing device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0110] Furthermore, embodiments of the present invention may also be computer-readable storage media storing computer program instructions thereon, which, when executed by a processor, cause the processor to perform the steps of the methods according to various embodiments of the present invention described in the "Exemplary Methods" section above.

[0111] The computer-readable storage medium may be any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or any combination thereof. More specific examples (a non-exhaustive list) of readable storage media include: an electrical connection having one or more wires, a portable disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof.

[0112] The basic principles of the present invention have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in the present invention are merely examples and not limitations, and should not be considered as essential features of each embodiment of the present invention. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the present invention to the necessity of employing the aforementioned specific details.

[0113] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For system embodiments, since they largely correspond to method embodiments, the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0114] The block diagrams of devices, systems, devices, and systems involved in this invention are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, systems, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0115] The methods and systems of the present invention may be implemented in many ways. For example, they may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order of steps for the methods is for illustrative purposes only, and the steps of the methods of the present invention are not limited to the order specifically described above unless otherwise specifically stated. Furthermore, in some embodiments, the present invention may also be implemented as a program recorded on a recording medium, the program comprising machine-readable instructions for implementing the methods according to the present invention. Thus, the present invention also covers recording media storing programs for performing the methods according to the present invention.

[0116] It should also be noted that in the systems, apparatus, and methods of the present invention, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered equivalents of the present invention. The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the invention. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the invention. Therefore, the invention is not intended to be limited to the aspects shown herein, but rather to be carried out within the widest scope consistent with the principles and novel features disclosed herein.

[0117] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of the invention to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A method for calculating the injected current of DSSC electronic power equipment, characterized in that, include: Establish a power flow model for the DSSC electronic power equipment and perform power flow calculations to obtain the active and reactive power output by the DSSC electronic power equipment. Establish a stability model for DSSC electronic power equipment, wherein the stability model includes a converter control model module, a power injection model module, and a grid connection interface model module; The active power and the reactive power are input into the stability model to calculate the injection current of the DSSC electronic power equipment; The active power and reactive power are input into the stability model to calculate the injected current of the DSSC electronic power equipment, including: The active power, the reactive power, and the line active power reference value of the system-level control model are input to the converter control model module, and the limiting converter d-axis command and the limiting converter q-axis command are output. The d-axis command of the limiting converter, the q-axis command of the limiting converter, and the line active power reference value are input into the power injection model module, and the equivalent injected active power at both ends of the DSSC electronic power equipment line is output. The equivalent injected active power at both ends of the line and the voltage values ​​at both ends of the line are input to the grid-connected interface model module, and the injected current of the DSSC electronic power equipment is output. The formula for calculating the equivalent injected active power at both ends of the line is: In the formula, P i Inject active power into the beginning of the line; P j Inject active power into the end of the line; V l This refers to the voltage value at the beginning of the line where the DSSC is located; P’ l This refers to the active power at the beginning of the line. Q’ l This refers to the reactive power at the beginning of the line. X l For line reactance; The formula for calculating the injection current is: In the formula, P i Inject active power into the beginning of the line; P j Inject active power into the end of the line; V lx This represents the real part of the voltage at the beginning of the line. V ly This represents the imaginary part of the voltage at the beginning of the line. V rx This represents the real part of the voltage at the end of the line. V ry This represents the imaginary part of the voltage at the end of the line. I ix Inject the real part of the grid current into the beginning of the line; I iy Inject the imaginary part of the grid current into the beginning of the line; I jx Inject the real part of the grid current into the end of the line; I jy The imaginary part of the grid current is injected into the end of the line.

2. The method according to claim 1, characterized in that, The active power, reactive power, and the line active power reference value of the system-level control model are input to the converter control model module, and the limiting converter d-axis command and limiting converter q-axis command are output, including: The difference between the active power and the line active power reference value is passed through a PI regulator to obtain the converter voltage phasor. The voltage phasor with a 90° amplitude is added to or subtracted from the phase value of the line current of the DSSC electronic power equipment, and then decomposed into a d-axis component that is in phase with the voltage value at the beginning of the line and a q-axis component that is orthogonal to the voltage value at the beginning of the line through DQ coordinate transformation. The d-axis component and the q-axis component are passed through a voltage limiting circuit to obtain the limited d-axis command and the limited q-axis command of the converter.

3. A DSSC electronic power equipment injection current calculation device, used to implement the method of claim 1, characterized in that, include: The first module is used to establish the power flow model of the DSSC electronic power equipment and perform power flow calculations to obtain the active and reactive power output by the DSSC electronic power equipment. The second module is used to establish a stability model of the DSSC electronic power equipment, wherein the stability model includes a converter control model module, a power injection model module, and a grid connection interface model module. The calculation module is used to input the active power and the reactive power into the stability model to calculate the injection current of the DSSC electronic power equipment.

4. The apparatus according to claim 3, characterized in that, The first output submodule includes: The unit is used to obtain the converter voltage phasor by passing the difference between the active power and the line active power reference value through a PI regulator; The decomposition unit is used to add or subtract a voltage phasor of 90° amplitude to the phase value of the line current of the DSSC electronic power equipment, and then decompose the voltage phasor into a d-axis component that is in phase with the voltage value at the beginning of the line and a q-axis component that is orthogonal to the voltage value at the beginning of the line through DQ coordinate transformation. The obtaining unit is used to pass the d-axis component and the q-axis component through a voltage limiting circuit to obtain the limited d-axis command and the limited q-axis command of the converter.

5. A computer-readable storage medium, characterized in that, The storage medium stores a computer program for performing the method described in any one of claims 1-2.

6. An electronic device, characterized in that, The electronic device includes: processor; Memory used to store the processor's executable instructions; The processor is configured to read the executable instructions from the memory and execute the instructions to implement the method described in any one of claims 1-2.

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