Control method and device based on low-voltage transformer area flexible interconnection equipment

Abstract

The invention provides a control method and device based on low-voltage transformer area flexible interconnection equipment. The method comprises the following steps: acquiring first measurement information, second measurement information, first virtual information and second virtual information; wherein the first measurement information represents the current operation parameter of the converter at the FOVSG side, the second measurement information represents the current operation parameter of the converter at the FOLVSM side, the first virtual information represents the virtual operation parameter of the FOVSG side, and the second virtual information represents the virtual operation parameter of the FOLVSM side; determining first execution information according to the first measurement information and the first virtual information, and determining second execution information according to the second measurement information and the second virtual information; wherein the first execution information is used for controlling the operation of the FOVSG side of the low-voltage transformer area flexible interconnection equipment, and the second execution information is used for controlling the operation of the FOLVSM side of the low-voltage transformer area flexible interconnection equipment. The method is used for improving the stability of the flexible interconnection power distribution network.

Description

Technical Field

[0001] This application relates to the field of power system technology, and in particular to a control method and device based on flexible interconnection equipment for low-voltage distribution areas. Background Technology

[0002] The impact of low-voltage distribution area power quality is mainly manifested in harmonic pollution, three-phase imbalance, voltage fluctuations and flicker, and voltage exceeding limits. Compared with traditional distribution networks, AC / DC flexible interconnected distribution networks have richer technical advantages, such as the ability to actively absorb intermittent energy, optimize system operation by scheduling feeder power flow, ensure uninterrupted power supply to critical loads, and improve power quality.

[0003] However, most current flexible interconnection devices use constant DC bus voltage and constant power control, which lacks the ability to cope with distribution network fluctuations. They can only operate stably under the balanced state of the distribution network and do not have active support capabilities, resulting in a reduction in the inertia level of the distribution network and affecting safety and stability.

[0004] Therefore, there is an urgent need for a solution that can effectively cope with distribution network fluctuations and improve the stability of flexible interconnected distribution networks. Summary of the Invention

[0005] This application provides a control method and apparatus based on flexible interconnection equipment in low-voltage distribution areas to improve the stability of flexible interconnected distribution networks.

[0006] Firstly, this application provides a control method based on a low-voltage distribution area flexible interconnection device. This method is applied to a control system based on the low-voltage distribution area flexible interconnection device, which includes two converters. The two converters are respectively equipped with a fractional-order virtual synchronous generator (FOVSG) and a fractional-order load virtual synchronous machine (FOLVSM). The method includes:

[0007] Acquire first measurement information, second measurement information, first virtual information, and second virtual information; wherein, the first measurement information represents the current operating parameters at the converter on the FOVSG side, the second measurement information represents the current operating parameters at the converter on the FOLVSM side, the first virtual information represents the virtual operating parameters on the FOVSG side, and the second virtual information represents the virtual operating parameters on the FOLVSM side.

[0008] Based on the first measurement information and the first virtual information, first execution information is determined, and based on the second measurement information and the second virtual information, second execution information is determined; wherein, the first execution information is used to control the operation of the FOVSG side of the low-voltage distribution area flexible interconnection equipment, and the second execution information is used to control the operation of the FOLVSM side of the low-voltage distribution area flexible interconnection equipment.

[0009] Optionally, as described above, the first measurement information includes first frequency information and first voltage information; wherein, the first frequency information represents the current frequency measurement value at the converter on the FOVSG side, and the first voltage information represents the current voltage measurement value at the converter on the FOVSG side; based on the first measurement information and the first virtual information, the first execution information is determined, including:

[0010] Based on the first frequency information and the first virtual information, the first phase angle information is determined; wherein, the first phase angle information represents the phase angle of the converter on the FOVSG side;

[0011] Based on the first voltage information, the first voltage amplitude information is determined; wherein, the first voltage amplitude information represents the voltage amplitude of the converter on the FOVSG side;

[0012] The first phase angle information and the first voltage amplitude information are determined as the first execution information.

[0013] Optionally, as described above, the first virtual information includes first virtual angular frequency information, virtual mechanical power information, and virtual moment of inertia information; wherein, the first virtual angular frequency information represents the virtual angular frequency on the FOVSG side, the virtual mechanical power information represents the virtual mechanical power on the FOVSG side, and the virtual moment of inertia information represents the virtual moment of inertia on the FOVSG side; determining the first phase angle information based on the first frequency information and the first virtual information includes:

[0014] Acquire first actual angular frequency information and actual mechanical power information; wherein, the first actual angular frequency information represents the measured value of the angular frequency on the FOVSG side, and the actual mechanical power information represents the measured value of the mechanical power on the FOVSG side;

[0015] The first phase angle information is determined based on the first frequency information, the first virtual angular frequency, the virtual mechanical power information, the virtual moment of inertia information, the first actual angular frequency information, the actual mechanical power information, the preset fractional order, the preset reference frequency, and the preset reference mechanical power.

[0016] Optionally, as described above, the first phase angle information satisfies:

[0017] θ=∫ωdt;

[0018]

[0019] P m =P ref +D p (f ref -f);

[0020] Where θ represents the first phase angle information, ω represents the first virtual angular frequency information, ω0 represents the first actual angular frequency information, and P m P represents virtual mechanical power information. e The actual mechanical power information is represented by D, the damping coefficient by J, the virtual moment of inertia by λ, and the preset fractional order by P. ref Characterizing the preset reference mechanical power, D p Characterizing the droop coefficient, f ref The preset reference frequency is represented by f, which represents the first frequency information.

[0021] Optionally, as described above, determining the first voltage amplitude information based on the first voltage information includes:

[0022] Obtain the first demand reactive power command value; wherein, the first demand reactive power command value represents the reactive power command value to be output on the FOVSG side;

[0023] The first voltage amplitude information is determined based on the first voltage information, the first demand reactive power command value, the preset first reference voltage, and the preset first reference reactive power command value.

[0024] Optionally, as described above, the first voltage amplitude information satisfies:

[0025] E=K q ∫[Q ref +D q (U n -U)-Q e ]dt;

[0026] Where E represents the first voltage amplitude information, K q Characterizing the integral coefficient, Q ref The first reference reactive power command value, Q, represents the preset value. e U represents the reactive power command value of the first demand. n U represents the preset first reference voltage, and U represents the first voltage information.

[0027] Optionally, as described above, the two converters are symmetrical to each other, and the midpoint side between the two converters represents the DC link; the second measurement information includes second voltage information and third voltage information; wherein, the second voltage information represents the current voltage measurement value at the midpoint side, and the third voltage information represents the current voltage measurement value at the converter on the FOLVSM side; based on the second measurement information and the second virtual information, the second execution information is determined, including:

[0028] The second voltage information and the preset DC voltage reference value are input into the preset proportional-integral PI controller to obtain the output virtual mechanical torque;

[0029] The second phase angle information is determined based on the virtual mechanical torque and the second virtual information; wherein, the second phase angle information represents the phase angle of the converter on the FOLVSM side;

[0030] Based on the third voltage information, the second voltage amplitude information is determined; wherein, the second voltage amplitude information represents the voltage amplitude of the converter on the FOLVSM side;

[0031] The second phase information and the second voltage amplitude information are determined as the second execution information.

[0032] Alternatively, as described above, the virtual mechanical torque satisfies:

[0033] T m =K pu (U dc -U dcref )+K iu ∫(U dc -U dcref )dt;

[0034] Among them, T m Characterizing virtual mechanical torque, K pu The proportionality coefficient, K, represents the midpoint side. iu U represents the integral coefficient on the midpoint side. dc Characterizing the second voltage information, U dcref Characterizes the preset DC reference voltage value.

[0035] Optionally, as described above, the second virtual information includes second virtual angular frequency information, virtual mechanical torque information, and virtual moment of inertia information; wherein, the second virtual angular frequency information represents the virtual angular frequency on the FOLVSM side, the virtual mechanical torque information represents the virtual mechanical torque on the FOLVSM side, and the virtual moment of inertia information represents the virtual moment of inertia on the FOLVSM side; based on the virtual mechanical torque and the second virtual information, the second phase angle information is determined, including:

[0036] Acquire the second actual angular frequency information and the actual electromagnetic torque information; wherein, the second actual angular frequency information represents the measured value of the angular frequency on the FOLVSM side, and the actual electromagnetic torque information represents the measured value of the electromagnetic torque on the FOLVSM side.

[0037] The second phase angle information is determined based on the second actual angular frequency information, the actual electromagnetic torque information, the second virtual angular frequency information, the virtual mechanical torque information, the virtual moment of inertia information, and the preset fractional order.

[0038] Alternatively, as described above, the second phase angle information satisfies:

[0039] θ=∫ωdt;

[0040]

[0041] Where θ represents the second phase angle information, ω represents the second virtual angular frequency information, ω0 represents the second actual angular frequency information, and T e T represents the actual electromagnetic torque information. m The virtual mechanical torque information is represented by D, the damping coefficient is represented by J, the virtual moment of inertia information is represented by λ, and the preset fractional order is represented by λ.

[0042] Optionally, as described above, determining the second voltage amplitude information based on the third voltage information includes:

[0043] Obtain the second demand reactive power command value; wherein, the second demand reactive power command value represents the reactive power command value to be output on the FOLVSM side;

[0044] The second voltage amplitude information is determined based on the third voltage information, the second demand reactive power command value, the preset second reference voltage, and the preset second reference reactive power command value.

[0045] Optionally, as described above, the second voltage amplitude information satisfies:

[0046] E=K q ∫[Q ref +D q (U n -U)-Q e ]dt;

[0047] Where E represents the second voltage amplitude information, K q Characterizing the integral coefficient, Q ref The second reference reactive power command value, Q, represents the preset value. e U represents the reactive power command value of the second demand. n U represents the preset second reference voltage, and U represents the third voltage information.

[0048] Secondly, this application provides a control device based on a low-voltage distribution area flexible interconnection device, comprising:

[0049] The acquisition unit is used to acquire first measurement information, second measurement information, first virtual information, and second virtual information; wherein, the first measurement information represents the current operating parameters at the converter on the FOVSG side, the second measurement information represents the current operating parameters at the converter on the FOLVSM side, the first virtual information represents the virtual operating parameters on the FOVSG side, and the second virtual information represents the virtual operating parameters on the FOLVSM side.

[0050] The determining unit is configured to determine first execution information based on first measurement information and first virtual information, and to determine second execution information based on second measurement information and second virtual information; wherein the first execution information is used to control the operation of the FOVSG side of the flexible interconnection device in the low-voltage distribution area, and the second execution information is used to control the operation of the FOLVSM side of the flexible interconnection device in the low-voltage distribution area.

[0051] Thirdly, this application provides an electronic device, including: a memory and a processor;

[0052] Memory stores computer-executable instructions;

[0053] The processor executes computer execution instructions stored in memory, causing the processor to perform the first aspect and / or various possible implementations of the first aspect as described above.

[0054] Fourthly, this application provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement the first aspect and / or various possible embodiments of the first aspect.

[0055] Fifthly, this application provides a computer program product, comprising: a computer program that, when executed by a processor, implements the first aspect and / or various possible implementations of the first aspect.

[0056] This application provides a control method and apparatus based on flexible interconnection equipment in low-voltage distribution areas. The method is applied to a control system based on such equipment, which includes two converters. Each converter is equipped with a fractional-order virtual synchronous generator (FOVSG) and a fractional-order load virtual synchronous machine (FOLVSM). The method acquires first measurement information, second measurement information, first virtual information, and second virtual information. Further, it determines first execution information based on the first measurement information and the first virtual information, and determines second execution information based on the second measurement information and the second virtual information. The first measurement information represents the current operating parameters at the converter on the FOVSG side, the second measurement information represents the current operating parameters at the converter on the FOLVSM side, the first virtual information represents the virtual operating parameters on the FOVSG side, and the second virtual information represents the virtual operating parameters on the FOLVSM side. The first execution information is used to control the operation of the FOVSG side of the flexible interconnection equipment in the low-voltage distribution area, and the second execution information is used to control the operation of the FOLVSM side of the flexible interconnection equipment in the low-voltage distribution area. The method in this application considers deploying a fractional-order virtual synchronous generator (FOVSG) and a fractional-order load virtual synchronous machine (FOLVSM) on two converters respectively, and determining first and second execution information to control the operation of the FOVSG side and the FOLVSM side of the flexible interconnection equipment in the low-voltage distribution area, respectively. This can effectively cope with distribution network fluctuations and improve the stability of the flexible interconnected distribution network. The method in this application is used to improve the stability of the flexible interconnected distribution network. Attached Figure Description

[0057] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0058] Figure 1 A flowchart illustrating a control method based on a flexible interconnection device for low-voltage distribution areas provided in this application. Figure 1 ;

[0059] Figure 2 A flowchart illustrating a control method based on a flexible interconnection device for low-voltage distribution areas provided in this application. Figure 2 ;

[0060] Figure 3 A flowchart illustrating a control method based on a flexible interconnection device for low-voltage distribution areas provided in this application. Figure 3 ;

[0061] Figure 4 A flowchart illustrating a control method based on a flexible interconnection device for low-voltage distribution areas provided in this application. Figure 4 ;

[0062] Figure 5 A schematic diagram of a topology based on a flexible interconnection device for low-voltage distribution areas is provided in this application;

[0063] Figure 6 A schematic diagram of the control architecture of the active-frequency loop on the FOVSG side provided in this application;

[0064] Figure 7 A schematic diagram of the control architecture of the reactive-voltage loop on the FOVSG side provided in this application;

[0065] Figure 8 A schematic diagram of the control architecture of the active-frequency loop on the FOLVSM side provided in this application;

[0066] Figure 9 A schematic diagram of the structure of a control device based on a low-voltage distribution area flexible interconnection device provided in this application. Figure 1 ;

[0067] Figure 10 A schematic diagram of the structure of a control device based on a low-voltage distribution area flexible interconnection device provided in this application. Figure 2 ;

[0068] Figure 11 This is a schematic diagram of the structure of an electronic device provided in this application.

[0069] The accompanying drawings have illustrated specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to specific embodiments. Detailed Implementation

[0070] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0071] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties. Furthermore, the collection, use and processing of the relevant data must comply with relevant laws, regulations and standards, and corresponding operation entry points are provided for users to choose to authorize or refuse.

[0072] The impact of low-voltage distribution area power quality is mainly manifested in harmonic pollution, three-phase imbalance, voltage fluctuations and flicker, and voltage exceeding limits. Compared with traditional distribution networks, AC / DC flexible interconnected distribution networks have richer technical advantages, such as the ability to actively absorb intermittent energy, optimize system operation by scheduling feeder power flow, ensure uninterrupted power supply to critical loads, and improve power quality.

[0073] However, most current flexible interconnection devices use constant DC bus voltage and constant power control, which lacks the ability to cope with distribution network fluctuations. They can only operate stably under the balanced state of the distribution network and do not have active support capabilities, resulting in a reduction in the inertia level of the distribution network and affecting safety and stability.

[0074] Therefore, there is an urgent need for a solution that can effectively cope with distribution network fluctuations and improve the stability of flexible interconnected distribution networks.

[0075] This application provides a control method and apparatus based on flexible interconnection equipment in low-voltage distribution areas. The method is applied to a control system based on such equipment, which includes two converters. Each converter is equipped with a fractional-order virtual synchronous generator (FOVSG) and a fractional-order load virtual synchronous generator (FVRSG). The method (FOLVSM Machine) acquires first measurement information, second measurement information, first virtual information, and second virtual information. Further, it determines first execution information based on the first measurement information and the first virtual information, and determines second execution information based on the second measurement information and the second virtual information. The first measurement information represents the current operating parameters at the converter on the FOUSG side, the second measurement information represents the current operating parameters at the converter on the FOLVSM side, the first virtual information represents virtual operating parameters on the FOUSG side, and the second virtual information represents virtual operating parameters on the FOLVSM side. The first execution information is used to control the operation of the FOVSG side of the low-voltage distribution area flexible interconnection equipment, and the second execution information is used to control the operation of the FOLVSM side of the low-voltage distribution area flexible interconnection equipment.

[0076] The method in this application considers deploying a fractional-order virtual synchronous generator (FOVSG) and a fractional-order load virtual synchronous machine (FOLVSM) on two converters respectively, and determining the first execution information and the second execution information respectively, so as to control the operation of the FOVSG side and the FOLVSM side of the flexible interconnection equipment in the low-voltage distribution area, which can effectively cope with distribution network fluctuations and improve the stability of the flexible interconnection distribution network.

[0077] The method described in this application is used to improve the stability of flexible interconnected distribution networks.

[0078] The following specific embodiments describe in detail the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0079] Figure 1 A flowchart illustrating a control method based on a flexible interconnection device for low-voltage distribution areas provided in this application. Figure 1 The execution subject of this method can be a server, host, or other device. This method is applied to a control system based on flexible interconnection equipment in low-voltage distribution areas. The control system includes two converters; wherein, the two converters are respectively deployed with a fractional-order virtual synchronous generator (FOVSG) and a fractional-order load virtual synchronous machine (FOLVSM), such as... Figure 1 As shown, the method may include:

[0080] S101. Obtain first measurement information, second measurement information, first virtual information, and second virtual information; wherein, the first measurement information represents the current operating parameters at the converter on the FOVSG side, the second measurement information represents the current operating parameters at the converter on the FOLVSM side, the first virtual information represents the virtual operating parameters on the FOVSG side, and the second virtual information represents the virtual operating parameters on the FOLVSM side.

[0081] Among them, Fractional-order Virtual Synchronous Generator (FOVSG) can refer to a virtual synchronous generator that incorporates fractional order. Specifically, a virtual synchronous generator can refer to a control strategy that enhances the stability of the power system by simulating the dynamic characteristics (such as inertia and damping) of a synchronous generator. Furthermore, by introducing fractional-order calculus, FOVSG can further optimize the processing speed of the virtual synchronous generator to provide inertial support and damping regulation more quickly and effectively, thereby improving the accuracy of subsequent determination of the first execution information to cope with distribution network fluctuations and improve the stability of the flexible interconnected distribution network.

[0082] Fractional-order load virtual synchronous machine (FOLVSM) can refer to a virtual synchronous generator at the load end that incorporates a fractional order. Specifically, FOLVSM simulates the dynamic characteristics of a synchronous generator at the load end, and in combination with the fractional order, it can also be used to improve the accuracy of subsequent determination of the second execution information in order to cope with distribution network fluctuations and improve the stability of flexible interconnected distribution networks.

[0083] It is understandable that the two converters in the control system based on the flexible interconnection equipment of the low-voltage distribution area are respectively deployed with fractional-order virtual synchronous generator (FOVSG) and fractional-order load virtual synchronous machine (FOLVSM), and the first virtual information corresponding to the FOVSG side and the second virtual information corresponding to the FOLVSM side can be obtained.

[0084] Specifically, the first virtual information can characterize the virtual operating parameters on the FOVSG side. For example, the first virtual information may include, but is not limited to, virtual angular frequency, virtual frequency, virtual mechanical power, virtual moment of inertia, etc.

[0085] The second virtual information can characterize the virtual operating parameters on the FOLVSM side. For example, the second virtual information may include, but is not limited to, virtual mechanical torque, virtual angular frequency, virtual moment of inertia, etc.

[0086] The first measurement information can characterize the current operating parameters at the converter on the FOVSG side. For example, the first measurement information may include, but is not limited to, actual angular frequency, actual mechanical power, actual voltage, actual frequency, etc.

[0087] The second measurement information can characterize the current operating parameters at the converter on the FOLVSM side. For example, the second measurement information may include, but is not limited to, the actual voltage on the FOLVSM side and the actual voltage at the midpoint between the FOLVSM side and the FOVSG side.

[0088] For example, the first measurement information and the second measurement information can both be obtained by sensors deployed at the two converters respectively, and the first virtual information and the second virtual information can both be obtained by simulation by a preset simulation system. No restrictions are placed on the specific acquisition methods of the first measurement information, the second measurement information, the first virtual information, and the second virtual information.

[0089] S102. Determine first execution information based on first measurement information and first virtual information, and determine second execution information based on second measurement information and second virtual information; wherein, the first execution information is used to control the operation of the FOVSG side of the flexible interconnection device in the low-voltage distribution area, and the second execution information is used to control the operation of the FOLVSM side of the flexible interconnection device in the low-voltage distribution area.

[0090] The first execution information can refer to the control command for adjusting the operation of the converter on the FOVSG side. Specifically, when there are fluctuations in the distribution network, the first measurement information fluctuates. Then, the first execution information can be determined based on the first measurement information and the first virtual information. The first execution information may include, but is not limited to, phase, voltage amplitude, etc. By executing the first execution information, the FOVSG side can effectively cope with the fluctuations in the distribution network and maintain the stable operation of the flexible interconnection equipment in the low-voltage distribution area.

[0091] The second execution information can refer to the control command for adjusting the operation of the converter on the FOLVSM side. Specifically, when there are fluctuations in the distribution network, the second measurement information fluctuates. Then, based on the second measurement information and the second virtual information, the second execution information can be determined. The second execution information may include, but is not limited to, phase, voltage amplitude, etc. By executing the second execution information, the FOLVSM side can effectively cope with the fluctuations in the distribution network and maintain the stable operation of the flexible interconnection equipment in the low-voltage distribution area.

[0092] For example, when the frequency on the FOVSG side of the distribution network fluctuates, the deviation between the actual frequency in the first measurement information and the virtual frequency in the first virtual information can be determined. Based on this deviation, an active power regulation command, i.e., the first execution information, is then determined to maintain the frequency stability of the distribution network. The same principle applies to maintaining the frequency stability of the distribution network on the FOLVSM side.

[0093] The method in this application considers deploying a fractional-order virtual synchronous generator (FOVSG) and a fractional-order load virtual synchronous machine (FOLVSM) on two converters respectively, and determining first and second execution information to control the operation of the FOVSG side and the FOLVSM side of the flexible interconnection equipment in the low-voltage distribution area, respectively. This can effectively cope with distribution network fluctuations and improve the stability of the flexible interconnected distribution network. The method in this application is used to improve the stability of the flexible interconnected distribution network.

[0094] Figure 2 A flowchart illustrating a control method based on a flexible interconnection device for low-voltage distribution areas provided in this application. Figure 2 The execution subject of this method can be a server, host, or other device. This method is applied to a control system based on flexible interconnection equipment in low-voltage distribution areas. The control system includes two converters; wherein, the two converters are respectively deployed with a fractional-order virtual synchronous generator (FOVSG) and a fractional-order load virtual synchronous machine (FOLVSM), such as... Figure 2 As shown, the method may include:

[0095] S201. Obtain first measurement information and first virtual information; wherein, the first measurement information represents the current operating parameters at the converter on the FOVSG side, the first virtual information represents the virtual operating parameters on the FOVSG side, the first measurement information includes first frequency information and first voltage information, the first frequency information represents the current frequency measurement value at the converter on the FOVSG side, and the first voltage information represents the current voltage measurement value at the converter on the FOVSG side.

[0096] The first measurement information includes first frequency information and first voltage information. The first frequency information represents the current frequency measurement value at the converter on the FOVSG side, and the first voltage information represents the current voltage measurement value at the converter on the FOVSG side.

[0097] It is understandable that the first measurement information and the first virtual information can be used to determine the first execution information. By executing the first execution information, the FOVSG side can effectively cope with the fluctuations of the distribution network and maintain the stable operation of the flexible interconnection equipment in the low-voltage distribution area.

[0098] S202. Determine the first phase angle information based on the first frequency information and the first virtual information; wherein, the first frequency information represents the current frequency measurement value at the converter on the FOVSG side, and the first phase angle information represents the phase angle of the converter on the FOVSG side.

[0099] The first phase angle information can characterize the phase angle of the converter on the FOVSG side.

[0100] In one optional implementation, the first virtual information includes first virtual angular frequency information, virtual mechanical power information, and virtual moment of inertia information; wherein, the first virtual angular frequency information represents the virtual angular frequency on the FOVSG side, the virtual mechanical power information represents the virtual mechanical power on the FOVSG side, and the virtual moment of inertia information represents the virtual moment of inertia on the FOVSG side.

[0101] In some embodiments, step S202 may specifically include: acquiring first actual angular frequency information and actual mechanical power information. The first actual angular frequency information represents the measured value of the angular frequency on the FOVSG side, and the actual mechanical power information represents the measured value of the mechanical power on the FOVSG side; and the first phase angle information is determined based on the first frequency information, the first virtual angular frequency, the virtual mechanical power information, the virtual moment of inertia information, the first actual angular frequency information, the actual mechanical power information, a preset fractional order, and a preset reference mechanical power.

[0102] The first frequency information can refer to the current frequency measurement value at the converter on the FOVSG side. For example, the first frequency information can be obtained by measuring the frequency using a preset frequency sensor. The first virtual angular frequency can refer to the angular frequency simulated based on the FOVSG. The virtual mechanical power information can refer to the mechanical power simulated based on the FOVSG. The virtual moment of inertia information can refer to the moment of inertia simulated based on the FOVSG. The first actual angular frequency information can refer to the actual value of the angular frequency directly measured from the converter on the FOVSG side. The actual mechanical power information can refer to the measured value of the actual mechanical power of the converter on the FOVSG side. The preset fractional order can refer to a preset fractional order. For example, the fractional order can be 1 / 3. The preset reference mechanical power can refer to a preset reference value of the mechanical power.

[0103] For example, the first phase angle information can be obtained by determining the first frequency information, the first virtual angular frequency, the virtual mechanical power information, the virtual moment of inertia information, the first actual angular frequency information, the actual mechanical power information, the preset fractional order, and the preset reference mechanical power.

[0104] The first phase angle information is characterized as the output voltage phase of the converter on the FOVSG side.

[0105] The beneficial effect of this setting is that by comprehensively considering the actual measured values ​​and virtual set values, and combining the fractional order, the first phase angle information can be calculated more accurately, thereby achieving precise control of the FOVSG-side converter. This helps to effectively cope with distribution network fluctuations, enhance the stability and reliability of flexible interconnection equipment in low-voltage distribution areas, and improve power quality.

[0106] In one alternative implementation, the first phase angle information can satisfy:

[0107] θ=∫ωdt;

[0108]

[0109] P m =P ref +D p (f ref -f);

[0110] Where θ represents the first phase angle information, ω represents the first virtual angular frequency information, ω0 represents the first actual angular frequency information, and P m P represents virtual mechanical power information. e The actual mechanical power information is represented by D, the damping coefficient by J, the virtual moment of inertia by λ, and the preset fractional order by P. ref Characterizing the preset reference mechanical power, D p Characterizing the droop coefficient, fref The preset reference frequency is represented by f, which represents the first frequency information.

[0111] In the above formula, the determination of the first phase angle information characterizes the logic of the fractional-order virtual synchronous generator (FOVSG) simulation. Specifically, It characterizes the dynamic behavior of fractional orders. The relationship between the virtual moment of inertia J and the fractional derivative of the angular frequency deviation Δω is characterized, reflecting the inertial response of the control system based on the flexible interconnection equipment in the low-voltage distribution area. D(ω-ω0) characterizes the damping characteristics of the control system based on the flexible interconnection equipment in the low-voltage distribution area. P m =P ref +D p (f ref -f) guarantees the virtual mechanical power P m There is a preset reference mechanical power P ref and frequency deviation (f ref -f) Through the droop coefficient D p The results obtained demonstrate that the control system based on the flexible interconnection equipment in the low-voltage distribution area can achieve power regulation under frequency deviation.

[0112] S203. Determine the first voltage amplitude information based on the first voltage information; wherein, the first voltage information represents the current voltage measurement value at the converter on the FOVSG side, and the first voltage amplitude information represents the voltage amplitude of the converter on the FOVSG side.

[0113] The first voltage amplitude information can be characterized as the output voltage amplitude of the converter on the FOVSG side.

[0114] In one alternative implementation, step S203 may include:

[0115] Obtain the first demand reactive power command value; wherein the first demand reactive power command value represents the reactive power command value to be output on the FOVSG side; determine the first voltage amplitude information based on the first voltage information, the first demand reactive power command value, the preset first reference voltage, and the preset first reference reactive power command value.

[0116] The first demand reactive power command value represents the reactive power command value to be output from the FOVSG side. This first demand reactive power command value can be preset by staff based on relevant needs or control strategies, or it can be dynamically calculated based on real-time distribution network conditions.

[0117] Furthermore, the first voltage amplitude information can be determined based on the first voltage information, the first demand reactive power command value, the preset first reference voltage, and the preset first reference reactive power command value.

[0118] In one alternative implementation, the first voltage amplitude information can satisfy:

[0119] E=K q ∫[Q ref +D q (U n -U)-Q e ]dt;

[0120] Where E represents the first voltage amplitude information, K q Characterizing the integral coefficient, Q ref The first reference reactive power command value, Q, represents the preset value. e U represents the reactive power command value of the first demand. n U represents the preset first reference voltage, and U represents the first voltage information.

[0121] Specifically, K q Characterizing the integral coefficients, exemplarily, K q The preset integral coefficient is used to adjust the gain of the integral process, thereby improving the response speed and stability of the control system based on the flexible interconnection equipment of the low-voltage distribution area.

[0122] The preset first reference reactive power command value Q ref The preset first reference voltage U is used as a reference for reactive power control. n Used as a reference for the voltage on the FOVSG side.

[0123] It is understandable that the first voltage amplitude can also be determined by integration, which can effectively cope with voltage fluctuations in the distribution network.

[0124] The beneficial effect of this setting is that, based on the first voltage information, the first demand reactive power command value, the preset first reference voltage, and the preset first reference reactive power command value, the first voltage amplitude information can be determined, thereby achieving precise control of the FOVSG-side converter. This helps to effectively cope with distribution network fluctuations, enhance the stability and reliability of flexible interconnection equipment in low-voltage distribution areas, and improve power quality.

[0125] S204. The first phase angle information and the first voltage amplitude information are determined as the first execution information; wherein, the first execution information is used to control the operation of the FOVSG side of the low-voltage distribution area flexible interconnection equipment.

[0126] It is understandable that determining the first phase angle information and the first voltage amplitude information as the first execution information can be used to control the operation of the converter on the FOVSG side, enabling precise control of the flexible interconnection equipment in the low-voltage distribution area, which helps to improve the power quality and stability of the distribution network. In particular, when the distribution network faces fluctuations or imbalances, it can quickly respond and maintain the stable operation of the distribution network.

[0127] The method in this application considers deploying a fractional-order virtual synchronous generator (FOVSG) and a fractional-order load virtual synchronous machine (FOLVSM) on two converters respectively. Specifically, the first phase angle information and the first voltage amplitude information are determined as the first execution information to control the operation of the FOVSG side of the flexible interconnection equipment in the low-voltage distribution area. This can effectively cope with distribution network fluctuations and improve the stability of the flexible interconnected distribution network. The method in this application is used to improve the stability of the flexible interconnected distribution network.

[0128] Figure 3 A flowchart illustrating a control method based on a flexible interconnection device for low-voltage distribution areas provided in this application. Figure 3 The execution subject of this method can be a server, host, or other device. This method is applied to a control system based on flexible interconnection equipment in low-voltage distribution areas. The control system includes two converters; wherein, the two converters are respectively deployed with a fractional-order virtual synchronous generator (FOVSG) and a fractional-order load virtual synchronous machine (FOLVSM), such as... Figure 3 As shown, the method may include:

[0129] S301. Obtain second measurement information and second virtual information; wherein, the second measurement information represents the current operating parameters at the converter on the FOLVSM side, the second virtual information represents the virtual operating parameters on the FOLVSM side, the two converters are symmetrical to each other, the midpoint side between the two converters represents the DC link, the second measurement information includes second voltage information and third voltage information, wherein, the second voltage information represents the current voltage measurement value on the midpoint side, and the third voltage information represents the current voltage measurement value at the converter on the FOLVSM side.

[0130] The second measurement information includes second voltage information and third voltage information. The second voltage information represents the current voltage measurement value at the neutral point side, and the third voltage information represents the current voltage measurement value at the converter on the FOLVSM side. For example, the second voltage information can also be referred to as the DC bus voltage measurement value.

[0131] It is understandable that the second measurement information and the second virtual information can be used to determine the second execution information. By executing the second execution information, the FOLVSM side can effectively cope with the fluctuations of the distribution network and maintain the stable operation of the flexible interconnection equipment in the low-voltage distribution area.

[0132] S302. Input the second voltage information and the preset DC voltage reference value into the preset proportional-integral PI controller to obtain the output virtual mechanical torque.

[0133] The preset proportional-integral (PI) controller can be used to output virtual mechanical torque. For example, the PI controller can be a pre-configured control loop used to generate corresponding virtual parameters based on the error between the second voltage information and the preset DC voltage reference value.

[0134] The advantage of this setup is that it stabilizes the DC bus voltage.

[0135] In one alternative implementation, the virtual mechanical torque can satisfy:

[0136] T m =K pu (U dc -U dcref )+K iu ∫(U dc -U dcref )dt;

[0137] Among them, T m Characterizing virtual mechanical torque, K pu The proportionality coefficient, K, represents the midpoint side. iu U represents the integral coefficient on the midpoint side. dc Characterizing the second voltage information, U dcref Characterizes the preset DC reference voltage value.

[0138] For example, the scaling factor K on the midpoint side pu The integral coefficient K on the midpoint side iu A coefficient can be preset for the staff; specifically, the proportional coefficient K on the midpoint side. pu The integral coefficient K on the midpoint side iu The specific values ​​can be determined by staff through relevant experiments, model simulations, or automatic parameter tuning algorithms.

[0139] S303. Determine the second phase angle information based on the virtual mechanical torque and the second virtual information; wherein, the second phase angle information represents the phase angle of the converter on the FOLVSM side, and the second virtual information represents the virtual operating parameters on the FOLVSM side.

[0140] The second phase angle information can characterize the phase angle of the converter on the FOLVSM side.

[0141] In one optional implementation, the second virtual information includes second virtual angular frequency information, virtual mechanical torque information, and virtual moment of inertia information; wherein, the second virtual angular frequency information represents the virtual angular frequency on the FOLVSM side, the virtual mechanical torque information represents the virtual mechanical torque on the FOLVSM side, and the virtual moment of inertia information represents the virtual moment of inertia on the FOLVSM side.

[0142] Step S303 may include:

[0143] Acquire the second actual angular frequency information and the actual electromagnetic torque information; wherein, the second actual angular frequency information represents the measured value of the angular frequency on the FOLVSM side, and the actual electromagnetic torque information represents the measured value of the electromagnetic torque on the FOLVSM side; determine the second phase angle information based on the second actual angular frequency information, the actual electromagnetic torque information, the second virtual angular frequency information, the virtual mechanical torque information, the virtual moment of inertia information, and the preset fractional order.

[0144] Among them, the second actual angular frequency information can refer to the actual value of the angular frequency directly measured from the converter on the FOLVSM side; the actual electromagnetic torque information can refer to the electromagnetic torque of the motor on the FOLVSM side during operation; the second virtual angular frequency information can refer to the angular frequency obtained based on FOLVSM simulation; the virtual mechanical torque information can refer to the mechanical torque obtained based on FOLVSM simulation; the virtual moment of inertia information can refer to the moment of inertia obtained based on FOLVSM simulation; and the preset fractional order can refer to a pre-set fractional order, for example, the fractional order can be 1 / 3.

[0145] It is understandable that the second phase angle information can be determined based on the second actual angular frequency information, the actual electromagnetic torque information, the second virtual angular frequency information, the virtual mechanical torque information, the virtual moment of inertia information, and the preset fractional order.

[0146] In one alternative implementation, the second phase angle information can satisfy:

[0147] θ=∫ωdt;

[0148]

[0149] Where θ represents the second phase angle information, ω represents the second virtual angular frequency information, ω0 represents the second actual angular frequency information, and T e T represents the actual electromagnetic torque information. m The virtual mechanical torque information is represented by D, the damping coefficient is represented by J, the virtual moment of inertia information is represented by λ, and the preset fractional order is represented by λ.

[0150] It can be understood that, in the above formula, the determination of the second phase angle information characterizes the logic of the fractional-order load virtual synchronous generator (FOLVSM) simulation. Specifically, The relationship between the virtual moment of inertia J and the fractional derivative of the angular frequency deviation Δω is characterized, reflecting the inertial response of the control system based on the flexible interconnection equipment in the low-voltage distribution area. D(ω-ω0) characterizes the damping characteristics of the control system based on the flexible interconnection equipment in the low-voltage distribution area. T e -T mIt characterizes the difference between the actual electromagnetic torque and the virtual electromagnetic torque. Taking into account this difference, it is used to determine the second phase angle and can also ensure the stability of DC voltage in the subsequent operation of the distribution network.

[0151] S304. Determine the second voltage amplitude information based on the third voltage information; wherein, the second voltage amplitude information represents the voltage amplitude of the converter on the FOLVSM side.

[0152] The second voltage amplitude can be characterized as the output voltage amplitude of the converter on the FOLVSM side.

[0153] In an optional implementation, step S304 may include:

[0154] Obtain the second demand reactive power command value; wherein the second demand reactive power command value represents the reactive power command value to be output on the FOLVSM side; determine the second voltage amplitude information based on the third voltage information, the second demand reactive power command value, the preset second reference voltage, and the preset second reference reactive power command value.

[0155] The second reactive power demand command value represents the reactive power command value to be output from the FOLVSM side. This second reactive power demand command value can be preset by staff based on relevant needs or control strategies, or it can be dynamically calculated based on real-time distribution network conditions.

[0156] Furthermore, based on the third voltage information, the second demand reactive power command value, the preset second reference voltage, and the preset second reference reactive power command value, the second voltage amplitude information can be determined.

[0157] In one alternative implementation, the second voltage amplitude information can satisfy:

[0158] E=K q ∫[Q ref +D q (U n -U)-Q e ]dt;

[0159] Where E represents the second voltage amplitude information, K q Characterizing the integral coefficient, Q ref The second reference reactive power command value, Q, represents the preset value. e U represents the reactive power command value of the second demand. n U represents the preset second reference voltage, and U represents the third voltage information.

[0160] Specifically, K q Characterizing the integral coefficients, exemplarily, K qThe preset integral coefficient is used to adjust the gain of the integral process, thereby improving the response speed and stability of the control system based on the flexible interconnection equipment of the low-voltage distribution area.

[0161] The preset second reference reactive power command value Q ref The preset second reference voltage U is used as a reference for reactive power control. n Used as a reference for the voltage on the FOLVSM side.

[0162] It is understandable that the second voltage amplitude can also be determined by integration, which can effectively cope with voltage fluctuations in the distribution network.

[0163] The beneficial effect of this setting is that, based on the third voltage information, the second demand reactive power command value, the preset second reference voltage, and the preset second reference reactive power command value, the first voltage amplitude information is determined, thereby achieving precise control of the FOLVSM-side converter. This helps to effectively cope with distribution network fluctuations, enhance the stability and reliability of flexible interconnection equipment in low-voltage distribution areas, and improve power quality.

[0164] S305. The second phase information and the second voltage amplitude information are determined as the second execution information; wherein, the second execution information is used to control the operation of the FOLVSM side of the low-voltage distribution area flexible interconnection equipment.

[0165] It is understandable that determining the second phase angle information and the second voltage amplitude information as the second execution information can be used to control the operation of the converter on the FOLVSM side, enabling precise control of the flexible interconnection equipment in the low-voltage distribution area. This helps improve the power quality and stability of the distribution network, especially when the distribution network faces fluctuations or imbalances, it can quickly respond and maintain the stable operation of the distribution network.

[0166] The method in this application considers deploying a fractional-order virtual synchronous generator (FOVSG) and a fractional-order load virtual synchronous machine (FOLVSM) on two converters respectively. Specifically, the second phase information and the second voltage amplitude information are determined as the second execution information to control the operation of the FOLVSM side of the flexible interconnection equipment in the low-voltage distribution area. This can effectively cope with distribution network fluctuations and improve the stability of the flexible interconnected distribution network. The method in this application is used to improve the stability of the flexible interconnected distribution network.

[0167] Figure 4 A flowchart illustrating a control method based on a flexible interconnection device for low-voltage distribution areas provided in this application. Figure 4The execution subject of this method can be a server, host, or other device. This method is applied to a control system based on flexible interconnection equipment in low-voltage distribution areas. The control system includes two converters; wherein, the two converters are respectively deployed with a fractional-order virtual synchronous generator (FOVSG) and a fractional-order load virtual synchronous machine (FOLVSM), such as... Figure 4 As shown, the method may include:

[0168] S401. Determine the topology of the flexible interconnection equipment in the low-voltage distribution area and obtain the mathematical model of the converter in the three-phase stationary coordinate system.

[0169] To better describe the topology of flexible interconnection devices in low-voltage distribution areas Figure 5 A schematic diagram of a topology based on a flexible interconnection device for low-voltage distribution areas is provided in this application, as shown below. Figure 5 As shown, the low-voltage distribution area flexible interconnection equipment includes two converters. VSC1 represents the converter on the FOLVSM side, and VSC2 represents the converter on the FOVSG side. The two converters are symmetrical to each other and are electrically connected through a DC link with a parallel capacitor in the middle, thereby realizing bidirectional energy transmission of AC-DC-AC.

[0170] Specifically, taking either of the two converters as an example, the determination of the general mathematical model of the converter in the three-phase stationary coordinate system is described.

[0171] Specifically, taking the converter on the FOVSG side as an example, the determination of the general mathematical model of the converter in the three-phase stationary coordinate system is described.

[0172] The circuit equations of the converter are determined using Kirchhoff's laws (KVL), which is the first equation:

[0173]

[0174] The mathematical equation for the DC side is the second equation:

[0175]

[0176] Based on the known relationship between the voltage and current on the DC and AC sides, the third process is as follows:

[0177] E i =S i U dc ;

[0178] Based on the known relationship between the voltage and current on the DC side and the AC side, this is the fourth equation;

[0179] i dc2 =i a Sa +i b S b +i c S c ;

[0180] In the above equation, S i For the three-phase switching state of the converter, E i The voltage at the converter port side, u iN U represents the grid-connected voltage, i = a, b, c. L, R, and C are the inductance, resistance, and capacitance of the port grid-connected filter, respectively. dc i is the DC bus voltage. dc1 、i dc2 These represent the current flowing into the DC bus from the FOLVSM port and the current flowing out of the DC bus to the FOVSG port, respectively.

[0181] Furthermore, by substituting the third equation into the first equation and the fourth equation into the second equation, we can obtain the mathematical model of the converter in the three-phase stationary coordinate system:

[0182]

[0183] In the above equation, 1 represents the direction from FOLVSM to the DC bus, and 2 represents the direction from the DC bus to FOVSG.

[0184] Since the two converters are symmetrical, their mathematical models in the three-phase stationary coordinate system are numerically consistent, and the directions of current flow are opposite.

[0185] S402. Based on the topology of the flexible interconnection equipment in the low-voltage distribution area, determine the mathematical models of FOVSG and FOLVSM.

[0186] FOVSG includes an active-frequency loop and a reactive-voltage loop, while FOLVSM also includes an active-frequency loop and a reactive-voltage loop.

[0187] To better describe the processing of the FOVSG active-frequency loop, the following steps are needed for the FOVSG active-frequency loop: Figure 6 The schematic diagram of the control architecture of the active-frequency loop on the FOVSG side provided in this application is as follows: Figure 6 As shown, the active-frequency loop of the FOVSG consists of two parts: Pf droop control and rotor motion equations.

[0188] Specifically, the rotor motion equations include:

[0189]

[0190] The Pf droop control component includes:

[0191] P m =P ref +D p (f ref -f);

[0192] Where ω represents the first virtual angular frequency information, ω0 represents the first actual angular frequency information, and P m P represents virtual mechanical power information. e The actual mechanical power information is represented by D, the damping coefficient by J, the virtual moment of inertia by λ, and the preset fractional order by P. ref Characterizing the preset reference mechanical power, D p Characterizing the droop coefficient, f ref The preset reference frequency is represented by f, which represents the first frequency information.

[0193] Accordingly, in the rotor motion equations, s characterizes the differential operator.

[0194] To better describe the processing of the reactive power-voltage loop in FOVSG, Figure 7 This is a schematic diagram of the control architecture of the reactive power-voltage loop on the FOVSG side provided in this application. The reactive power-voltage loop of the FOVSG includes a voltage regulation mathematical model, which is represented as follows:

[0195] E=K q ∫[Q ref +D q (U n -U)-Q e ]dt;

[0196] Where E represents the first voltage amplitude information, K q Characterizing the integral coefficient, Q ref The first reference reactive power command value, Q, represents the preset value. e U represents the reactive power command value of the first demand. n U represents the preset first reference voltage, and U represents the first voltage information.

[0197] Accordingly, in Figure 7 In this context, s represents the differential operator.

[0198] The active-frequency loop of FOLVSM differs from that of FOVSG in that it considers both actual and virtual electromagnetic torque, thereby improving the stability of DC voltage.

[0199] Specifically, to better describe the active-frequency loop processing of FOLVSM, Figure 8 The schematic diagram of the control architecture of the active-frequency loop on the FOLVSM side provided in this application is as follows: Figure 8 As shown, the active-frequency loop of FOLVSM takes into account both actual electromagnetic torque information and virtual electromagnetic torque information.

[0200] Specifically, the second voltage information and the preset DC voltage reference value are input into the preset proportional-integral (PI) controller to obtain the output virtual mechanical torque; based on the virtual mechanical torque and the second virtual information, the second phase angle information is determined; wherein, the second phase angle information represents the phase angle of the converter on the FOLVSM side, and the second virtual information represents the virtual operating parameters on the FOLVSM side.

[0201] Specifically, the second phase angle information satisfies:

[0202] θ=∫ωdt;

[0203]

[0204] Where θ represents the second phase angle information, ω represents the second virtual angular frequency information, ω0 represents the second actual angular frequency information, and T e T represents the actual electromagnetic torque information. m The virtual mechanical torque information is represented by D, the damping coefficient is represented by J, the virtual moment of inertia information is represented by λ, and the preset fractional order is represented by λ.

[0205] Accordingly, in Figure 8 In this context, s represents the differential operator.

[0206] The voltage regulation mathematical model included in the reactive power-voltage loop of FOLVSM is the same as that included in the reactive power-voltage loop of FOVSG, and will not be repeated here.

[0207] S403. Control the FOVSG side of the low-voltage distribution area flexible interconnection device according to the first phase angle information and the first voltage amplitude information output by FOVSG, and control the FOLVSM side of the low-voltage distribution area flexible interconnection device according to the second phase angle information and the second voltage amplitude information output by FOLVSM.

[0208] The method in this application considers deploying a fractional-order virtual synchronous generator (FOVSG) and a fractional-order load virtual synchronous machine (FOLVSM) on two converters respectively, and determining first and second execution information to control the operation of the FOVSG side and the FOLVSM side of the flexible interconnection equipment in the low-voltage distribution area, respectively. This can effectively cope with distribution network fluctuations and improve the stability of the flexible interconnected distribution network. The method in this application is used to improve the stability of the flexible interconnected distribution network.

[0209] Figure 9 A schematic diagram of the structure of a control device based on a low-voltage distribution area flexible interconnection device provided in this application. Figure 1 ,like Figure 9 As shown, the control device 90 based on the low-voltage distribution area flexible interconnection equipment includes: an acquisition unit 901 and a determination unit 902.

[0210] The acquisition unit 901 is used to acquire first measurement information, second measurement information, first virtual information, and second virtual information; wherein, the first measurement information represents the current operating parameters at the converter on the FOVSG side, the second measurement information represents the current operating parameters at the converter on the FOLVSM side, the first virtual information represents the virtual operating parameters on the FOVSG side, and the second virtual information represents the virtual operating parameters on the FOLVSM side.

[0211] The determining unit 902 is used to determine first execution information based on first measurement information and first virtual information, and to determine second execution information based on second measurement information and second virtual information; wherein the first execution information is used to control the operation of the FOVSG side of the low-voltage distribution area flexible interconnection device, and the second execution information is used to control the operation of the FOLVSM side of the low-voltage distribution area flexible interconnection device.

[0212] Figure 10 A schematic diagram of the structure of a control device based on a low-voltage distribution area flexible interconnection device provided in this application. Figure 2 ,like Figure 10 As shown, the control device 100 based on the flexible interconnection equipment of low-voltage distribution area includes: an acquisition unit 1001 and a determination unit 1002, wherein the determination unit 1002 includes a first processing module 10021 and a second processing module 10022.

[0213] In an optional example, the first measurement information includes first frequency information and first voltage information; wherein, the first frequency information represents the current frequency measurement value at the converter on the FOVSG side, and the first voltage information represents the current voltage measurement value at the converter on the FOVSG side.

[0214] The first processing module 10021 is used to determine the first phase angle information based on the first frequency information and the first virtual information; wherein the first phase angle information represents the phase angle of the converter on the FOVSG side;

[0215] Based on the first voltage information, the first voltage amplitude information is determined; wherein, the first voltage amplitude information represents the voltage amplitude of the converter on the FOVSG side;

[0216] The first phase angle information and the first voltage amplitude information are determined as the first execution information.

[0217] In an optional example, the first virtual information includes first virtual angular frequency information, virtual mechanical power information, and virtual moment of inertia information; wherein, the first virtual angular frequency information represents the virtual angular frequency on the FOVSG side, the virtual mechanical power information represents the virtual mechanical power on the FOVSG side, and the virtual moment of inertia information represents the virtual moment of inertia on the FOVSG side.

[0218] The first processing module 10021 is further configured to acquire first actual angular frequency information and actual mechanical power information; wherein, the first actual angular frequency information represents the measured value of the angular frequency on the FOVSG side, and the actual mechanical power information represents the measured value of the mechanical power on the FOVSG side; and the first phase angle information is determined based on the first frequency information, the first virtual angular frequency, the virtual mechanical power information, the virtual moment of inertia information, the first actual angular frequency information, the actual mechanical power information, the preset fractional order, the preset reference frequency, and the preset reference mechanical power.

[0219] In one optional example, the first phase angle information satisfies:

[0220] θ=∫ωdt;

[0221]

[0222] P m =P ref +D p (f ref -f);

[0223] Where θ represents the first phase angle information, ω represents the first virtual angular frequency information, ω0 represents the first actual angular frequency information, and P m P represents virtual mechanical power information. e The actual mechanical power information is represented by D, the damping coefficient by J, the virtual moment of inertia by λ, and the preset fractional order by P. ref Characterizing the preset reference mechanical power, D p Characterizing the droop coefficient, f ref The preset reference frequency is represented by f, which represents the first frequency information.

[0224] In an optional example, the first processing module 10021 is further configured to obtain a first demand reactive power command value; wherein the first demand reactive power command value represents the reactive power command value to be output on the FOVSG side; and determine the first voltage amplitude information based on the first voltage information, the first demand reactive power command value, the preset first reference voltage, and the preset first reference reactive power command value.

[0225] In one optional example, the first voltage amplitude information satisfies:

[0226] E=Kq ∫[Q ref +D q (U n -U)-Q e ]dt;

[0227] Where E represents the first voltage amplitude information, K q Characterizing the integral coefficient, Q ref The first reference reactive power command value, Q, represents the preset value. e U represents the reactive power command value of the first demand. n U represents the preset first reference voltage, and U represents the first voltage information.

[0228] In an optional example, the two converters are symmetrical to each other, and the midpoint side between the two converters represents the DC link; the second measurement information includes second voltage information and third voltage information; wherein, the second voltage information represents the current voltage measurement value at the midpoint side, and the third voltage information represents the current voltage measurement value at the converter on the FOLVSM side.

[0229] The second processing module 10022 is used to input the second voltage information and the preset DC voltage reference value into the preset proportional-integral PI controller to obtain the output virtual mechanical torque;

[0230] The second phase angle information is determined based on the virtual mechanical torque and the second virtual information; wherein, the second phase angle information represents the phase angle of the converter on the FOLVSM side;

[0231] Based on the third voltage information, the second voltage amplitude information is determined; wherein, the second voltage amplitude information represents the voltage amplitude of the converter on the FOLVSM side;

[0232] The second phase information and the second voltage amplitude information are determined as the second execution information.

[0233] In one optional example, the virtual mechanical torque satisfies:

[0234] T m =K pu (U dc -U dcref )+K iu ∫(U dc -U dcref )dt;

[0235] Among them, T m Characterizing virtual mechanical torque, K pu The proportionality coefficient, K, represents the midpoint side. iu U represents the integral coefficient on the midpoint side. dc Characterizing the second voltage information, U dcref Characterizes the preset DC reference voltage value.

[0236] In an optional example, the second virtual information includes second virtual angular frequency information, virtual mechanical torque information, and virtual moment of inertia information; wherein, the second virtual angular frequency information represents the virtual angular frequency on the FOLVSM side, the virtual mechanical torque information represents the virtual mechanical torque on the FOLVSM side, and the virtual moment of inertia information represents the virtual moment of inertia on the FOLVSM side.

[0237] The second processing module 10022 is also used to acquire second actual angular frequency information and actual electromagnetic torque information; wherein, the second actual angular frequency information represents the measured value of the angular frequency on the FOLVSM side, and the actual electromagnetic torque information represents the measured value of the electromagnetic torque on the FOLVSM side; and the second phase angle information is determined based on the second actual angular frequency information, actual electromagnetic torque information, second virtual angular frequency information, virtual mechanical torque information, virtual moment of inertia information, and a preset fractional order.

[0238] In one optional example, the second phase angle information satisfies:

[0239] θ=∫ωdt;

[0240]

[0241] Where θ represents the second phase angle information, ω represents the second virtual angular frequency information, ω0 represents the second actual angular frequency information, and T e T represents the actual electromagnetic torque information. m The virtual mechanical torque information is represented by D, the damping coefficient is represented by J, the virtual moment of inertia information is represented by λ, and the preset fractional order is represented by λ.

[0242] In an optional example, the second processing module 10022 is further configured to obtain a second demand reactive power instruction value; wherein the second demand reactive power instruction value represents the reactive power instruction value to be output on the FOLVSM side.

[0243] The second voltage amplitude information is determined based on the third voltage information, the second demand reactive power command value, the preset second reference voltage, and the preset second reference reactive power command value.

[0244] In one optional implementation, the second voltage amplitude information satisfies:

[0245] E=K q ∫[Q ref +D q (U n -U)-Q e ]dt;

[0246] Where E represents the second voltage amplitude information, K qCharacterizing the integral coefficient, Q ref The second reference reactive power command value, Q, represents the preset value. e U represents the reactive power command value of the second demand. n U represents the preset second reference voltage, and U represents the third voltage information.

[0247] Figure 11 A schematic diagram of the structure of an electronic device provided in this application, such as... Figure 11 As shown, the electronic device 110 provided in this embodiment includes at least one processor 1101 and a memory 1102. Optionally, the electronic device 110 further includes a communication component 1103. The processor 1101, the memory 1102, and the communication component 1103 are connected via a bus 1104.

[0248] In a specific implementation, at least one processor 1101 executes computer execution instructions stored in memory 1102, causing at least one processor 1101 to perform the above-described method.

[0249] The specific implementation process of processor 1101 can be found in the above method embodiments, and its implementation principle and technical effect are similar. It will not be repeated here.

[0250] In the above embodiments, it should be understood that the processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), etc. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in this invention can be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules within the processor.

[0251] The memory may include random access memory (RAM) and may also include non-volatile memory (NVM), such as at least one disk storage device.

[0252] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of illustration, the buses shown in the accompanying drawings are not limited to a single bus or a single type of bus.

[0253] This application also provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the above-described method.

[0254] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described method.

[0255] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily essential to this application.

[0256] It should be further noted that although the steps in the flowchart are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowchart may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

[0257] Furthermore, unless otherwise specified, the functional units / modules in the various embodiments of this application can be integrated into one unit / module, or each unit / module can exist physically separately, or two or more units / modules can be integrated together. The integrated units / modules described above can be implemented in hardware or as software program modules.

[0258] When integrated units / modules are implemented in hardware, the hardware can be digital circuits, analog circuits, etc. The physical implementation of the hardware structure includes, but is not limited to, transistors, memristors, etc. Unless otherwise specified, the processor can be any suitable hardware processor, such as a CPU, GPU, FPGA, DSP, and ASIC, etc. Unless otherwise specified, the storage unit can be any suitable magnetic or magneto-optical storage medium, such as Resistive Random Access Memory (RRAM), Dynamic Random Access Memory (DRAM), Static Random Access Memory (SRAM), Enhanced Dynamic Random Access Memory (EDRAM), High-Bandwidth Memory (HBM), Hybrid Memory Cube (HMC), etc.

[0259] If the integrated unit / module is implemented as a software program module and sold or used as an independent product, it can be stored in a computer-readable storage device (CMD). Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a memory and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned memory includes various media capable of storing program code, such as a USB flash drive, read-only memory (ROM), random access memory (RAM), portable hard drive, magnetic disk, or optical disk.

[0260] In the above embodiments, the descriptions of each embodiment have their own emphasis. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification.

[0261] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0262] It should be understood that the present application is not limited to the exact structure described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A control method based on flexible interconnection equipment in low-voltage distribution areas, characterized in that, A control system based on flexible interconnection equipment in low-voltage distribution areas is applied, wherein the control system includes two converters; wherein the two converters are respectively equipped with a fractional-order virtual synchronous generator (FOVSG) and a fractional-order load virtual synchronous machine (FOLVSM), and the method includes: Acquire first measurement information, second measurement information, first virtual information, and second virtual information; wherein, the first measurement information represents the current operating parameters at the converter on the FOVSG side, the second measurement information represents the current operating parameters at the converter on the FOLVSM side, the first virtual information represents the virtual operating parameters on the FOVSG side, and the second virtual information represents the virtual operating parameters on the FOLVSM side. Based on the first measurement information and the first virtual information, first execution information is determined, and based on the second measurement information and the second virtual information, second execution information is determined; wherein, the first execution information is used to control the operation of the FOVSG side of the low-voltage distribution area flexible interconnection device, and the second execution information is used to control the operation of the FOLVSM side of the low-voltage distribution area flexible interconnection device.

2. The method according to claim 1, characterized in that, The first measurement information includes first frequency information and first voltage information; wherein, the first frequency information represents the current frequency measurement value at the converter on the FOVSG side, and the first voltage information represents the current voltage measurement value at the converter on the FOVSG side; based on the first measurement information and the first virtual information, first execution information is determined, including: Based on the first frequency information and the first virtual information, the first phase angle information is determined; wherein, the first phase angle information represents the phase angle of the converter on the FOVSG side; Based on the first voltage information, first voltage amplitude information is determined; wherein, the first voltage amplitude information represents the voltage amplitude of the converter on the FOVSG side; The first phase angle information and the first voltage amplitude information are determined as the first execution information.

3. The method according to claim 2, characterized in that, The first virtual information includes first virtual angular frequency information, virtual mechanical power information, and virtual moment of inertia information; wherein, the first virtual angular frequency information represents the virtual angular frequency on the FOVSG side, the virtual mechanical power information represents the virtual mechanical power on the FOVSG side, and the virtual moment of inertia information represents the virtual moment of inertia on the FOVSG side; based on the first frequency information and the first virtual information, first phase angle information is determined, including: Acquire first actual angular frequency information and actual mechanical power information; wherein, the first actual angular frequency information represents the measured value of the angular frequency on the FOVSG side, and the actual mechanical power information represents the measured value of the mechanical power on the FOVSG side; The first phase angle information is determined based on the first frequency information, the first virtual angular frequency, the virtual mechanical power information, the virtual moment of inertia information, the first actual angular frequency information, the actual mechanical power information, the preset fractional order, the preset reference frequency, and the preset reference mechanical power.

4. The method according to claim 3, characterized in that, The first phase angle information satisfies: θ=∫ωdt; P m =P ref +D p (f ref -f); Where θ represents the first phase angle information, ω represents the first virtual angular frequency information, ω0 represents the first actual angular frequency information, and P m P represents virtual mechanical power information. e The actual mechanical power information is represented by D, the damping coefficient by J, the virtual moment of inertia by λ, and the preset fractional order by P. ref Characterizing the preset reference mechanical power, D p Characterizing the droop coefficient, f ref The preset reference frequency is represented by f, which represents the first frequency information.

5. The method according to claim 2, characterized in that, Based on the first voltage information, the first voltage amplitude information is determined, including: Obtain the first demand reactive power instruction value; wherein, the first demand reactive power instruction value represents the reactive power instruction value to be output on the FOVSG side; The first voltage amplitude information is determined based on the first voltage information, the first required reactive power command value, the preset first reference voltage, and the preset first reference reactive power command value.

6. The method according to claim 5, characterized in that, The first voltage amplitude information satisfies: E=K q ∫[Q ref +D q (U n -U)-Q e ]dt; Where E represents the first voltage amplitude information, K q Characterizing the integral coefficient, Q ref The first reference reactive power command value, Q, represents the preset value. e U represents the reactive power command value of the first demand. n U represents the preset first reference voltage, and U represents the first voltage information.

7. The method according to any one of claims 1-6, characterized in that, The two converters are symmetrical to each other, and the midpoint between the two converters represents the DC link; the second measurement information includes second voltage information and third voltage information; wherein, the second voltage information represents the current voltage measurement value at the midpoint, and the third voltage information represents the current voltage measurement value at the converter on the FOLVSM side; based on the second measurement information and the second virtual information, the second execution information is determined, including: The second voltage information and the preset DC voltage reference value are input into a preset proportional-integral (PI) controller to obtain the output virtual mechanical torque; Based on the virtual mechanical torque and the second virtual information, the second phase angle information is determined; wherein, the second phase angle information represents the phase angle of the converter on the FOLVSM side; Based on the third voltage information, the second voltage amplitude information is determined; wherein, the second voltage amplitude information represents the voltage amplitude of the converter on the FOLVSM side; The second phase information and the second voltage amplitude information are determined as the second execution information.

8. The method according to claim 7, characterized in that, The virtual mechanical torque satisfies: T m =K pu (U dc -U dcref )+K iu ∫(U dc -U dcref )dt; Among them, T m Characterizing virtual mechanical torque, K pu The proportionality coefficient, K, represents the midpoint side. iu U represents the integral coefficient on the midpoint side. dc Characterizing the second voltage information, U dcref Characterizes the preset DC reference voltage value.

9. The method according to claim 7, characterized in that, The second virtual information includes second virtual angular frequency information, virtual mechanical torque information, and virtual moment of inertia information; wherein, the second virtual angular frequency information represents the virtual angular frequency on the FOLVSM side, the virtual mechanical torque information represents the virtual mechanical torque on the FOLVSM side, and the virtual moment of inertia information represents the virtual moment of inertia on the FOLVSM side; based on the virtual mechanical torque and the second virtual information, the second phase angle information is determined, including: Acquire second actual angular frequency information and actual electromagnetic torque information; wherein, the second actual angular frequency information represents the measured value of the angular frequency on the FOLVSM side, and the actual electromagnetic torque information represents the measured value of the electromagnetic torque on the FOLVSM side. The second phase angle information is determined based on the second actual angular frequency information, the actual electromagnetic torque information, the second virtual angular frequency information, the virtual mechanical torque information, the virtual moment of inertia information, and the preset fractional order.

10. The method according to claim 9, characterized in that, The second phase angle information satisfies: θ=∫ωdt; Where θ represents the second phase angle information, ω represents the second virtual angular frequency information, ω0 represents the second actual angular frequency information, and T e T represents the actual electromagnetic torque information. m The virtual mechanical torque information is represented by D, the damping coefficient is represented by J, the virtual moment of inertia information is represented by λ, and the preset fractional order is represented by λ.

11. The method according to claim 7, characterized in that, Based on the third voltage information, the second voltage amplitude information is determined, including: Obtain the second demand reactive power command value; wherein, the second demand reactive power command value represents the reactive power command value to be output on the FOLVSM side; The second voltage amplitude information is determined based on the third voltage information, the second required reactive power command value, the preset second reference voltage, and the preset second reference reactive power command value.

12. The method according to claim 11, characterized in that, The second voltage amplitude information satisfies: E=K q ∫[Q ref +D q (U n -U)-Q e ]dt; Where E represents the second voltage amplitude information, K q Characterizing the integral coefficient, Q ref The second reference reactive power command value, Q, represents the preset value. e U represents the reactive power command value of the second demand. n U represents the preset second reference voltage, and U represents the third voltage information.

13. A control device based on flexible interconnection equipment for low-voltage distribution areas, characterized in that, include: The acquisition unit is used to acquire first measurement information, second measurement information, first virtual information, and second virtual information; wherein, the first measurement information represents the current operating parameters at the converter on the FOVSG side, the second measurement information represents the current operating parameters at the converter on the FOLVSM side, the first virtual information represents the virtual operating parameters on the FOVSG side, and the second virtual information represents the virtual operating parameters on the FOLVSM side. The determining unit is configured to determine first execution information based on the first measurement information and the first virtual information, and to determine second execution information based on the second measurement information and the second virtual information; wherein the first execution information is used to control the operation of the FOVSG side of the flexible interconnection device in the low-voltage distribution area, and the second execution information is used to control the operation of the FOLVSM side of the flexible interconnection device in the low-voltage distribution area.

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