Power distribution network control method and device, equipment and storage medium

Abstract

The invention discloses a power distribution network control method, device and equipment and a storage medium, and relates to the technical field of distributed control, and the method comprises the steps: determining a first control mode of a first coordination controller corresponding to a first distributed power supply in an AC sub-grid, and a second control mode of a second coordination controller corresponding to a second distributed power supply in the DC sub-grid. Determining a topology conversion control variable value according to the on-off state corresponding to the target intelligent switch and the system operation mode; adjusting the working frequency and the working voltage of the first distributed power supply based on the topological conversion control variable value and the first control mode; and adjusting the working voltage of the second distributed power supply based on the topological conversion control variable value and the second control mode. According to the technical scheme, the technical problem that in the prior art, when topology conversion is carried out on an alternating-current and direct-current hybrid power distribution system based on static topology, unwanted transient states can be generated, so that the operation flexibility of the system is reduced or cascade faults occur is solved.

Description

Technical Field

[0001] This application relates to the field of distributed control technology, and in particular to power distribution network control methods, devices, equipment and storage media. Background Technology

[0002] Hybrid AC / DC networks (MGs) for large-scale renewable energy plants in oilfields represent a viable resource for enhancing system resilience. Multiple geographically isolated MGs can be managed as a networked system, providing additional flexibility for resilient operation. Compared to traditional system architectures, each networked system has a predefined topology and interacts via a static point of common coupling (PCC). Dynamic systems have different electrical boundaries and interact at dynamic points of interconnection (POIs), and system topology transitions can be accomplished using smart switches. Compared to pure AC or DC systems, hybrid AC / DC systems offer higher operational reliability and flexibility when distributed generation (DG) is integrated on islanded feeders. AC and DC distribution feeders can be proactively interconnected, rather than operating as two isolated entities in islanded mode, and the total system power consumption can be supported by interconnect converters (ICs) from both AC and DC subgrids. Furthermore, the topologies of the AC and DC subgrids can be proactively reconfigured in a dynamic grid context, enabling more flexible operation.

[0003] Implementing dynamic MG (Mode Controller) in the autonomous operation of hybrid AC / DC systems requires dedicated oversight to improve MG performance in networked hybrid AC / DC systems from various angles. However, most existing work focuses on system operation under static topologies. Unwanted transients arise when sectionalizing switches change state during smart switch operation (i.e., topology transitions), reducing system operational resilience. Furthermore, this can further limit feasible reconfiguration options; if transients exceed acceptable limits, inverter-based DG (Distributed Generation) may be forced to trip, and MG may lose power, potentially leading to cascading system failures.

[0004] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is prior art. Summary of the Invention

[0005] The main objective of this application is to provide a power distribution network control method, apparatus, device, and storage medium, which aims to solve the technical problem that in the prior art, AC / DC hybrid power distribution systems based on static topology generate unwanted transients during topology conversion, leading to reduced system operational flexibility or cascading failures.

[0006] To achieve the above objectives, this application proposes a power distribution network control method, which is applied to an AC / DC hybrid power distribution system. The AC / DC hybrid power distribution system is divided into several minimum AC / DC hybrid sub-networks by intelligent switches. The method includes:

[0007] Determine the first control mode of the first coordination controller corresponding to the first distributed power source in the AC subgrid, and the second control mode of the second coordination controller corresponding to the second distributed power source in the DC subgrid;

[0008] The topology conversion control variable values ​​are determined based on the switch status and system operation mode of the target smart switch.

[0009] The first coordinating controller adjusts the operating frequency and operating voltage of the first distributed power source based on the topology conversion control variable value and the first control method.

[0010] The second coordinating controller adjusts the operating voltage of the second distributed power source based on the topology transformation control variable value and the second control method.

[0011] In one embodiment, the step of adjusting the operating frequency and operating voltage of the first distributed power source by the first coordination controller based on the topology transformation control variable value and the first control method includes:

[0012] Based on the topology transformation control variable values, determine the frequency control variable and voltage amplitude control variable corresponding to the first coordination controller;

[0013] The target operating frequency and target operating voltage amplitude of the first distributed power source are determined based on the frequency control variable and the voltage amplitude control variable, respectively.

[0014] The first coordination controller adjusts the operating frequency and operating voltage of the first distributed power source based on the target operating frequency, the target operating voltage amplitude, and the first control method.

[0015] In one embodiment, the step of determining the target operating frequency and target operating voltage amplitude of the first distributed power source based on the frequency control variable and the voltage amplitude control variable respectively includes:

[0016] Obtain the reference frequency, reference voltage amplitude, first active power output value, and reactive power output value of the first distributed power source;

[0017] The target operating frequency of the first distributed power source is determined based on the first droop gain, the reference frequency, the first active power output value, and the frequency control variable. The first droop gain is used to represent the relationship between the active power and the frequency of the first coordination controller.

[0018] The target operating voltage amplitude of the first distributed power source is determined based on the second droop gain, the reference voltage amplitude, the reactive power output value, and the voltage amplitude control variable. The second droop gain is used to represent the relationship between the reactive power and frequency of the first coordination controller.

[0019] In one embodiment, the step of adjusting the operating voltage of the second distributed power source by the second coordination controller based on the topology transformation control variable value and the second control method includes:

[0020] The voltage control variable corresponding to the second coordination controller is determined based on the value of the topology transformation control variable.

[0021] The target operating voltage of the second distributed power source is determined based on the voltage control variables.

[0022] The second coordinating controller adjusts the operating voltage of the second distributed power source based on the target operating voltage and the second control method.

[0023] In one embodiment, the step of determining the target operating voltage of the second distributed power source based on the voltage control variable includes:

[0024] Obtain the reference voltage and the second active power output value of the second distributed power source;

[0025] The target operating voltage of the second distributed power source is determined based on the third droop gain, the reference voltage, the second active power output value, and the voltage control variable. The third droop gain is used to represent the relationship between the active power and voltage of the second coordinated controller.

[0026] In one embodiment, an interconnecting converter is provided between the AC subgrid and the DC subgrid, and the method further includes:

[0027] The third control method corresponding to the interconnect converter is determined based on the second control method;

[0028] The power output of the grid is adjusted by the interconnecting converter based on the third control method.

[0029] In one embodiment, the step of adjusting the grid power output based on the third control method via the interconnect converter includes:

[0030] Obtain the third active power output value and the fourth droop gain of the interconnect converter, wherein the fourth droop gain is used to represent the relationship between the active power and voltage of the interconnect converter;

[0031] The DC-side operating voltage of the interconnect converter is determined based on the DC voltage control variable corresponding to the interconnect converter, the third active power output value, and the fourth droop gain.

[0032] The grid power output is adjusted by the interconnect converter based on the DC-side operating voltage and the third control method.

[0033] Furthermore, to achieve the above objectives, this application also proposes a power distribution network control device, wherein the device is equipped with an AC / DC hybrid power distribution system, the AC / DC hybrid power distribution system being divided into several minimum AC / DC hybrid sub-networks by intelligent switches, and the device includes:

[0034] The control mode determination module is used to determine the first control mode of the first coordination controller corresponding to the first distributed power source in the AC subgrid, and the second control mode of the second coordination controller corresponding to the second distributed power source in the DC subgrid.

[0035] The control variable value determination module is used to determine the topology conversion control variable value based on the switch state corresponding to the target smart switch and the system operating mode.

[0036] The operating parameter adjustment module is used to adjust the operating frequency and operating voltage of the first distributed power source based on the topology conversion control variable value and the first control method through the first coordination controller;

[0037] The operating parameter adjustment module is also used to adjust the operating voltage of the second distributed power source based on the topology conversion control variable value and the second control mode through the second coordination controller.

[0038] In addition, to achieve the above objectives, this application also proposes a power distribution network control device, the device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the power distribution network control method as described above.

[0039] In addition, to achieve the above objectives, this application also proposes a storage medium, which is a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it implements the steps of the power distribution network control method described above.

[0040] This application provides a power distribution network control method. It discloses a first control method for determining the first coordinating controller corresponding to the first distributed power source in the AC sub-grid, and a second control method for the second coordinating controller corresponding to the second distributed power source in the DC sub-grid. The method determines topology transition control variable values ​​based on the switch state of the target smart switch and the system operating mode. The first coordinating controller adjusts the operating frequency and voltage of the first distributed power source based on the topology transition control variable values ​​and the first control method. The second coordinating controller adjusts the operating voltage of the second distributed power source based on the topology transition control variable values ​​and the second control method. Compared to existing technologies where most MG (Distributed Generator) monitoring focuses on system operation under static topology, and where unnecessary transients occur when the smart switch changes state during operation, leading to reduced system operational flexibility or even cascading failures, this invention solves the technical problem in existing static topology-based AC / DC hybrid power distribution systems where unnecessary transients occur during topology transitions, resulting in reduced system operational flexibility or cascading failures. This is because the invention determines the topology transition control variable values ​​based on the switch state of the target smart switch and the system operating mode, and implements frequency regulation of the AC sub-grid and voltage regulation of the AC / DC sub-grid based on the topology transition control variable values ​​and the corresponding control method. Attached Figure Description

[0041] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0042] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 This is a flowchart illustrating an embodiment of the power distribution network control method of this application.

[0044] Figure 2 This is a structural diagram of a single hybrid MG in the power distribution network control method of this application;

[0045] Figure 3 This is a structural diagram of the hybrid MG in the power distribution network control method of this application;

[0046] Figure 4 This is a diagram illustrating the operational structure of a hybrid AC / DC power distribution system within the dynamic MG operating framework of the power distribution network control method described in this application.

[0047] Figure 5This is a flowchart illustrating Embodiment 2 of the power distribution network control method of this application.

[0048] Figure 6 This is a flowchart illustrating Embodiment 3 of the power distribution network control method of this application;

[0049] Figure 7 This is a schematic diagram of the module structure of the power distribution network control device according to an embodiment of this application;

[0050] Figure 8 This is a schematic diagram of the equipment structure of the hardware operating environment involved in the power distribution network control method in the embodiments of this application.

[0051] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0052] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of this application and are not intended to limit this application.

[0053] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0054] The main solution of this application embodiment is: determining the first control mode of the first coordinating controller corresponding to the first distributed power source in the AC subgrid, and the second control mode of the second coordinating controller corresponding to the second distributed power source in the DC subgrid; determining the topology conversion control variable value according to the switch state and system operation mode corresponding to the target smart switch; adjusting the operating frequency and operating voltage of the first distributed power source by the first coordinating controller based on the topology conversion control variable value and the first control mode; and adjusting the operating voltage of the second distributed power source by the second coordinating controller based on the topology conversion control variable value and the second control mode.

[0055] Since most of the monitoring work of existing MGs focuses on the system operation under static topology, unnecessary transients are generated when the segmented switches change state during the operation of smart switches, which leads to reduced system operation flexibility or even cascading failures.

[0056] This application provides a solution that can determine the topology transition control variable value based on the switch state and system operation mode of the target smart switch, and realize frequency regulation of AC subgrid and voltage regulation of AC-DC subgrid based on the topology transition control variable value and the corresponding control method. This solves the technical problem in the prior art that the AC-DC hybrid power distribution system based on static topology will generate unwanted transients during topology transition, resulting in reduced system operation flexibility or cascading failures.

[0057] It should be noted that the executing entity in this embodiment can be a computing service device with data processing, network communication, and program execution functions, such as a tablet computer, personal computer, or mobile phone, or an electronic device or power distribution network control device capable of performing the above functions. The following description uses a power distribution network control device (hereinafter referred to as the device) as an example to illustrate this embodiment and the subsequent embodiments.

[0058] Based on this, the embodiments of this application provide a power distribution network control method, referring to... Figure 1 , Figure 1 This is a flowchart illustrating the first embodiment of the power distribution network control method of this application.

[0059] In this embodiment, the method is applied to an AC / DC hybrid power distribution system, which is divided into several minimum AC / DC hybrid sub-networks by intelligent switches. The method includes steps S10 to S40:

[0060] Step S10: Determine the first control mode of the first coordinating controller corresponding to the first distributed power source in the AC subgrid, and the second control mode of the second coordinating controller corresponding to the second distributed power source in the DC subgrid.

[0061] It should be noted that implementing dynamic reactive power regulation (MG) in the autonomous operation of hybrid AC / DC systems requires specialized oversight, which can improve MG performance in networked hybrid AC / DC systems from various perspectives. However, most existing work focuses on system operation under static topologies, while research on network reconfiguration utilization is primarily described as a steady-state optimization problem. Furthermore, existing work on coordination between multiple distributed generation (DG) and integrated circuit (IC) systems mainly focuses on primary level control, which relies on system operating frequency and voltage drop control, leading to voltage deviations. At each IC, the deviations in AC-side frequency and DC-side voltage are numerically normalized. The normalized frequency and voltage represent the relationship between generation and consumption within the AC and DC subgrids, respectively; these can be used to adjust the operating state of each IC using various controller designs to achieve different objectives. Precise reactive power sharing in the AC subgrid and active power sharing between DGs in the DC subgrid are implemented in a distributed manner, but the operating frequency in the AC subgrid still deviates from its rated value. Consensus-based distributed controllers can achieve secondary frequency regulation of the AC subgrid and voltage regulation of the AC / DC subgrid, and power sharing is also implemented between DGs and ICs. However, these controllers are only applicable to systems with static topologies and do not support seamless topology transitions. Finally, for feeders with different bus voltages, local bus voltage and DG power sharing are contradictory. In addition to power sharing regulation, each DG will use a dynamic consensus observer to monitor the average operating voltage of the DG and adjust it according to the rated value. When the controller converges, the operating voltage on each DG will be regulated near the rated value, and precise proportional power sharing can be achieved. However, existing work is mainly developed for systems with static topologies, which will lead to unwanted transients when sectionalizing switches change state during switching operation, thereby reducing system operational resilience and further limiting feasible reconfiguration options. If the transients go beyond the limits, inverter-based DGs may be forced to trip, MGs may be de-energized, and this could lead to cascading failures in the system.

[0062] In practical applications, the existing structural diagrams of single MG and hybrid MG can be referenced. Figure 2 and 3 ,in, Figure 2 This is a structural diagram of a single hybrid MG in the power distribution network control method of this application; Figure 3 This is a structural diagram of the hybrid MG in the power distribution network control method of this application. Figure 2 and Figure 3As shown, the AC and DC subnetworks can interact through an interconnecting converter IC. When multiple AC and DC subnetworks exist, they can share the AC and DC buses. However, existing work is mainly developed for AC / DC hybrid distribution systems with static topologies, which leads to unwanted transients when sectionalizing switches change states during operation. This results in reduced system operational flexibility and even cascading failures. To address these issues, this application proposes an operational control framework for AC / DC hybrid distribution systems under dynamic grid conditions. (Refer to...) Figure 4 , Figure 4 This is a diagram illustrating the operational structure of a hybrid AC / DC power distribution system within the dynamic MG operating framework of the power distribution network control method described in this application. Figure 4 As shown, this scheme uses smart switches (SSWs) to divide the entire feeder into minimum MGs (min-MGs) in both AC and DC subgrids. Under the proposed dynamic MG control framework, changes in the system's operating topology are achieved using the installed SSWs, eliminating the need for additional power lines. Each min-MG contains a minimal set of DGs and SSWs that constitute an autonomous AC or DC MG; the minimum MG is the building block of the dynamic MG. Furthermore, min-MGs interconnected by closed SSWs operate as a whole, while isolated min-MGs operate independently. The electrical boundaries of the dynamic MGs are determined by the switching states of the SSWs and can be adjusted as needed.

[0063] It should be noted that, in this embodiment, the rules followed when dividing the min-MG are as follows: each min-MG has at least one interconnection point that is interconnected with the rest of the MG; in a radial AC / DC system, two adjacent min-MGs share a single SSW. In addition to the SSW, AC and DC dynamic MGs can also interact through interconnection converters, thereby further nesting the dynamic MGs within AC and DC distribution feeders.

[0064] It should be noted that the aforementioned first distributed power source can be a distributed power source in the AC subnetwork of an AC / DC hybrid power distribution system; the aforementioned first coordination controller can be a control unit for regulating the frequency and voltage of the AC subnetwork; correspondingly, the aforementioned first control method can be the method used to regulate the frequency and voltage of the AC subnetwork. In this embodiment, secondary control can be introduced into the distributed power source forming the network. Two operating modes can be designed for the AC subgrid: a static operating mode during static operation and a transitional operating mode when the system needs to be reconfigured. In the AC subgrid, by synchronizing the voltage phasors on both sides of the switch before the switch is closed, transients caused by reclosing can be suppressed; and by minimizing the active and reactive power flow through the switch before the switch is opened, transients caused by reclosing of the closed switch can be suppressed. Based on this, this embodiment can determine the control method of the coordination controller corresponding to the distributed power source in the AC subgrid.

[0065] It should be noted that the aforementioned second distributed power source can be a distributed power source in the DC sub-network of an AC / DC hybrid power distribution system; the aforementioned second coordination controller can be a control unit for regulating the frequency and voltage of the DC sub-network; correspondingly, the aforementioned second control method can be the method used to regulate the voltage of the DC sub-network. In this embodiment, by reducing the voltage amplitude mismatch on both sides before the switch is closed, the transient caused by the reclosing of the open switch in the DC sub-grid can be suppressed, while the transient caused by reopening the closed switch can be suppressed by the active power flow through the switch before the switch is opened. Similar to the AC sub-grid, the DC sub-grid has secondary regulation of system voltage and power distribution. Based on this, this embodiment can determine the control method of the coordination controller corresponding to the distributed power source in the DC sub-grid.

[0066] In this embodiment, communication networks G can be designed separately. ac and G dc Used for information exchange between AC and DC subgrids. Assume the communication network is a directed graph G = (V, ε), where V = {V1, V2, ..., V...} N} represents a set of nodes. This represents a valid communication link between nodes. If there is a path between every pair of vertices, v j ∈V (i≠j) is defined as a connected graph, that is, for v i ∈V, there exists at least one v j ∈V(i≠j), therefore {v i ,v j}∈ε; if all communication links are bidirectional, then v j ∈V (i≠j) is undirected. Communication network v jThe Laplace matrix of ∈V (i≠j) is defined as L=DA, where A={a ij} is the adjacency matrix. For an AC sub-network, G ac =(V ac ,ε ac ), node V ac It is the DG in the exchange subgrid. s For the DC subgrid, G dc =(V dc ,ε dc ), node V dc These are interconnecting converters and DGs in the DC subnet. In this invention, it is assumed that G... ac and G dc If all elements are connected and undirected, then their corresponding Laplace matrix is ​​symmetric.

[0067] Step S20: Determine the topology conversion control variable value based on the switching state and system operation mode corresponding to the target smart switch.

[0068] It should be noted that, to ensure feasible operation during network reconfiguration, the operational topology should be optimized by the system operator, taking into account various system operational constraints (e.g., DG power, renewable / load forecasting, system imbalance mitigation, etc.) to achieve different economic objectives (e.g., maximum received load, minimum power loss, minimum switching operations, etc.). If internal assets have different ownership, their willingness to participate in network reconfiguration and changes in electrical boundaries should also be considered by the system operator as constraints for forming a dynamic power grid.

[0069] It should be noted that the aforementioned target smart switches can be smart switches whose states need to be changed during this network reconfiguration. The switch state refers to the on / off state of the smart switch. In practical applications, to ensure the effectiveness of the proposed transition regulations and system operational flexibility throughout the topology transition process, only one target SSW should change its switch state at a time, and the optimal system operating topology can be achieved through the sequential operation of SSWs. Specifically, while achieving seamless topology transition on different SSWs, regulations may cause contradictions. Similar to determining the optimal system operating topology, system operators should also consider various system operating constraints and optimize the network reconfiguration sequence (i.e., the sequential selection of target SSWs) to achieve different operational objectives. In this scheme, to achieve optimal network reconfiguration, the system operator can select target SSWs sequentially to ensure the operational feasibility of the entire system after each SSW operation, and to optimize the cumulative performance of the entire system during the process.

[0070] It should be understood that the above system operation mode can be the current operation mode of the AC / DC hybrid power distribution system. In this embodiment, the system operation mode can include: static operation mode and transition operation mode. The static operation mode can be the mode in which the system is running statically, and the system does not need to perform topology conversion. The transition operation mode can be the mode in which the system needs to reconfigure the topology of the AC and DC sub-grids, and the system needs to perform topology conversion.

[0071] It should be noted that the above topology transformation control variable values ​​can be used to control how the system's operating frequency, voltage, and power are regulated.

[0072] Step S30: The first coordination controller adjusts the operating frequency and operating voltage of the first distributed power source based on the topology conversion control variable value and the first control mode.

[0073] Step S40: The second coordination controller adjusts the operating voltage of the second distributed power supply based on the topology transformation control variable value and the second control mode.

[0074] In practical implementation, the aforementioned topology transformation control variable values ​​can be two binary variables, λ and η. The device can determine how to adjust the system's operating frequency, voltage, and power based on the topology transformation control variable values ​​and the control methods corresponding to different sub-networks. Specifically, for the AC sub-network, when λ = 0 and η = 0, no topology transformation is needed, so the DG (i.e., the first distributed generation) operates in static mode, and the system operating frequency and the average voltage of the DG can be adjusted according to the rated values. When λ = 1 and η = 0, the target SSW is required to be closed, and the DG is in transition mode. Besides the secondary adjustment of the proportional power distribution between the system operating frequency and the DG, the voltage phasors on both sides of the target SSW should be synchronized. When λ = 0 and η = 1, the target SSW is required to be opened, and the DG is in transition mode. In addition to the secondary adjustment of frequency and voltage, the power through the target SSW is also minimized. For the DC subgrid, when λ = 0 and η = 0, the DG (i.e., the second distributed generation) operates in static mode, the system topology is static, and the average voltage of the DG is regulated according to the rated value. When λ = 1 and η = 0, the target SSW is required to be closed, and the DG is in transition mode. In addition to the secondary regulation of the proportional power sharing of the DG, the voltages on both sides of the target SSW are synchronized. When λ = 0 and η = 1, the target SSW is required to be opened, and the DG is in transition mode. In addition to the secondary voltage regulation, the power passing through the target SSW also needs to be minimized.

[0075] This embodiment provides a power distribution network control method. The method discloses a first control mode for determining the first coordinating controller corresponding to the first distributed power source in the AC sub-grid, and a second control mode for the second coordinating controller corresponding to the second distributed power source in the DC sub-grid. It determines the topology transition control variable value based on the switch state of the target smart switch and the system operating mode. The first coordinating controller adjusts the operating frequency and voltage of the first distributed power source based on the topology transition control variable value and the first control mode. The second coordinating controller adjusts the operating voltage of the second distributed power source based on the topology transition control variable value and the second control mode. Compared to existing technologies where most MG (Multi-Government Management) monitoring focuses on system operation under static topology, where unnecessary transients occur when the smart switch changes state during operation, leading to reduced system operational flexibility or even cascading failures, this embodiment determines the topology transition control variable value based on the switch state of the target smart switch and the system operating mode, and implements frequency regulation of the AC sub-grid and voltage regulation of the AC / DC sub-grid based on the topology transition control variable value and the corresponding control mode. This solves the technical problem in existing technologies where static topology-based AC / DC hybrid power distribution systems generate unnecessary transients during topology transitions, leading to reduced system operational flexibility or cascading failures.

[0076] Based on the first embodiment of this application, in the second embodiment of this application, the content that is the same as or similar to that in the first embodiment described above can be referred to the above description, and will not be repeated hereafter. Based on this, please refer to... Figure 5 , Figure 5 This is a flowchart illustrating Embodiment 2 of the power distribution network control method of this application.

[0077] In this embodiment, step S30 includes steps S301 to S303:

[0078] Step S301: Determine the frequency control variable and voltage amplitude control variable corresponding to the first coordinating controller based on the topology transformation control variable value.

[0079] It should be understood that the frequency control variable mentioned above can be a variable used in the first coordination controller to control the frequency of the first distributed power source; the voltage amplitude control variable mentioned above can be a variable used in the first coordination controller to control the voltage amplitude of the first distributed power source.

[0080] Step S302: Determine the target operating frequency and target operating voltage amplitude of the first distributed power source based on the frequency control variable and the voltage amplitude control variable, respectively.

[0081] It should be noted that the target operating frequency mentioned above can be the operating frequency at which the first distributed power source should be after the system undergoes topology transformation; the target operating voltage amplitude mentioned above can be the operating voltage amplitude at which the first distributed power source should be after the system undergoes topology transformation.

[0082] Specifically, step S302 includes: acquiring the reference frequency, reference voltage amplitude, first active power output value, and reactive power output value of the first distributed power source; determining the target operating frequency of the first distributed power source based on the first droop gain, the reference frequency, the first active power output value, and the frequency control variable, wherein the first droop gain is used to represent the relationship between the active power and frequency of the first coordination controller; and determining the target operating voltage amplitude of the first distributed power source based on the second droop gain, the reference voltage amplitude, the reactive power output value, and the voltage amplitude control variable, wherein the second droop gain is used to represent the relationship between the reactive power and frequency of the first coordination controller.

[0083] It should be understood that the first droop gain mentioned above can be the Pf droop gain, which is a parameter representing the relationship between the active power and frequency of the first coordinating controller, and can be used to adjust the active power and frequency of the system; the second droop gain mentioned above can be the QV droop gain, which is a parameter representing the relationship between the reactive power and frequency of the first coordinating controller, and can be used to adjust the reactive power and frequency of the system.

[0084] It is understood that the aforementioned first active power output value can be the active power output value of distributed generation in the AC subgrid; the aforementioned reactive power output value can be the active power output value of distributed generation in the AC subgrid.

[0085] In this embodiment, the control method of the first coordination controller corresponding to the first distributed power source in the AC subgrid can be designed as follows:

[0086] ω i =ω * -m i,ac P i +ΔΩ i,ac ;

[0087] E i =E * -n i,ac Q i +ΔE i,ac ;

[0088] Where, ω i ω is the operating frequency of the DG (i.e., the operating frequency of the first distributed power source). * E is the reference frequency of DG (i.e., the reference frequency of the first distributed power source mentioned above).i E represents the operating voltage amplitude of the DG (i.e., the operating voltage amplitude of the first distributed power source). * For the DG reference voltage amplitude (i.e., the reference voltage amplitude of the first distributed power source mentioned above), m i,ac Let Pf be the droop gain of the i-th DG in the AC subgrid (i.e., the first droop gain mentioned above), n i,ac For the QV droop gain of the i-th DG in the AC subgrid (i.e., the second droop gain mentioned above), P i Q is the first active power output value mentioned above. i The reactive power output value is ΔΩ. i,ac For the frequency control variable mentioned above, ΔE i,ac These are the voltage amplitude control variables mentioned above.

[0089] In this embodiment, the calculation formulas for the frequency control variable and the voltage amplitude control variable can be as follows:

[0090]

[0091]

[0092] Where, Δω i =ω i -ω * and These represent secondary adjustments to the system's operating frequency and voltage, respectively. The average operating voltage of the DG observed by the distributed average observer based on dynamic consensus is calculated using the following formula:

[0093]

[0094] In the formula, a ij ∈A ac This indicates that the proposed distributed average observer is the standard form of the dynamic consensus algorithm; due to G ac It is connected and undirected, and is guaranteed to converge to... The consensus equilibrium point; ΔP′ ij =∑a ij (ΔP i ′-ΔP j ΔQ′ indicates a mismatch in the distribution of accumulated active power in the distributed generation (DG). ij =∑a ij (ΔQ′ i -ΔQ′ j ) indicates a mismatch in the distribution of accumulated reactive power in the distributed generation (DG), where P i ′ and Q′ i λ represents the unit active power and unit reactive power output of the i-th DG, respectively; i and η iThese are two binary variables (i.e., the topology transformation control variables mentioned above); ΔE S =E S -E * and Δθ S These represent the single-sided voltage magnitude and phase mismatch required to shut down the target SSW, where E S This represents the single-sided voltage amplitude; ΔP′ S and ΔQ′ S These are respectively determined by the unit active power and unit reactive power required to open the target SSW. Finally, if there are multiple AC minimum voltage points with different voltage levels on the feeder, then ω in each DG... * The values ​​are the same, but E * The value is determined by the voltage level of the minimum voltage point of the connected DG. For the i-th and j-th DGs operating at different voltage levels, their exchange variables... and Before communication, the voltage is locally converted to a unit value by each DG. This scheme allows observation of the average voltage of each unit DG, which should be converted to the local actual value by each DG according to its rated voltage, for further adjustment. When the controller converges, each term on the right-hand side of the calculation formulas for the frequency control variable and the voltage amplitude control variable is equal to zero. In this embodiment, different regulatory measures can be taken for the specified operating mode, for example:

[0095] When λ i =0, η i When Δω = 0, since no topology transformation is required, the DG operates in static mode. The system operating frequency and the average voltage of the DG are adjusted to their rated values, Δω i =0, via ΔP′ ij =ΔQ′ ij =0 enables proportional sharing between DGs.

[0096] When λ i =1, η i When =0, the target SSW is required to be turned off, and DG is in transition mode. This is because E on both sides... S =E * , Δθ S＝0 At this point, in addition to the secondary adjustment of the proportional power distribution between the system operating frequency and DG, the voltage phasors on both sides of the target SSW should be synchronized, and the transients caused by the reopened target SSW should be suppressed.

[0097] When λ i =0, η i When ΔP' = 1, the target SSW is required to be turned on, and DG is in transition mode. This is because ΔP' S =ΔQ′ S=0. At this point, in addition to the regulation of the secondary frequency and voltage, the power through the target SSW is also minimized, and the transients caused by reopening a closed target SSW are also suppressed. When the target SSW is open, power sharing between physically isolated DGs is disabled.

[0098] Step S303: The first coordination controller adjusts the operating frequency and operating voltage of the first distributed power supply based on the target operating frequency, the target operating voltage amplitude, and the first control mode.

[0099] In practical applications, the topology transformation control variable λ can first be determined based on the current switching state of the target smart switch and the system operating mode. i and η i The values ​​are then substituted into the calculation formulas for the frequency control variable and the voltage amplitude control variable to obtain them. Subsequently, the frequency control variable and the voltage amplitude control variable can be substituted into the control mode corresponding to the pre-designed first coordinating controller, and the target operating frequency of the first distributed power source is calculated by combining the first droop gain, the reference frequency of the first distributed power source, and the first active power output value. At the same time, the target operating voltage amplitude of the first distributed power source is calculated by combining the second droop gain, the reference voltage amplitude of the first distributed power source, and the reactive power output value. Finally, the operating frequency and operating voltage of the first distributed power source are adjusted by the first coordinating controller based on the target operating frequency and the target operating voltage amplitude.

[0100] In this embodiment, the frequency control variable and voltage amplitude control variable corresponding to the first coordinating controller are determined based on the topology transformation control variable value; the target operating frequency and target operating voltage amplitude of the first distributed power source are determined based on the frequency control variable and voltage amplitude control variable, respectively; the operating frequency and operating voltage of the first distributed power source are adjusted by the first coordinating controller based on the target operating frequency, target operating voltage amplitude and a first control method, thereby achieving precise adjustment of the operating frequency and operating voltage of the first distributed power source so as to achieve seamless topology transformation in the future.

[0101] Based on the first and / or second embodiments of this application, in the third embodiment of this application, the content that is the same as or similar to the above embodiments can be referred to the above description, and will not be repeated hereafter. Based on this, please refer to... Figure 6 , Figure 6 This is a flowchart illustrating Embodiment 3 of the power distribution network control method of this application.

[0102] In this embodiment, step S40 includes steps S401 to S403:

[0103] Step S401: Determine the voltage control variable corresponding to the second coordinating controller based on the topology transformation control variable value.

[0104] It should be understood that the aforementioned voltage control variables can be variables used in the second coordinating controller to control the operating voltage of the second distributed power source.

[0105] Step S402: Determine the target operating voltage of the second distributed power source based on the voltage control variable.

[0106] It should be noted that the target operating voltage mentioned above can be the operating voltage that the second distributed power source should be at after the system undergoes topology conversion.

[0107] Specifically, step S402 includes: obtaining the reference voltage and the second active power output value of the second distributed power source; determining the target operating voltage of the second distributed power source based on the third droop gain, the reference voltage, the second active power output value, and the voltage control variable, wherein the third droop gain is used to represent the relationship between the active power and voltage of the second coordination controller.

[0108] It should be understood that the aforementioned third droop gain can be the PV droop gain, which is a parameter representing the relationship between the active power and voltage of the second coordinating controller, and can be used to adjust the active power and voltage of the system.

[0109] It is understandable that the aforementioned first active power output value can be the active power output value of distributed generation in the DC subgrid.

[0110] In this embodiment, the control method of the second coordination controller corresponding to the second distributed power source in the DC subgrid can be designed as follows:

[0111] V i =V * -n i,ac P i +ΔV i,ac ;

[0112] Among them, V i For the target operating voltage mentioned above, V * n is the reference voltage for the second distributed power source. i,ac Let ΔV be the PV droop gain of the i-th DG in the DC subgrid (i.e., the third droop gain mentioned above). i,ac These are the voltage control variables mentioned above.

[0113] In this embodiment, the formula for calculating the voltage control variable can be expressed as:

[0114]

[0115] Among them, a ij ∈A dc Similar to the operation of the AC sub-grid, due to G dc Since it is connected and undirected, the distributed observer in this case is guaranteed to converge to... The consensus balance point. Indicates power sharing with DG, ΔV S =|V S |-V * To determine the required single-sided voltage mismatch amplitude of the target SSW, where |V S | represents the target single-sided voltage, ΔP′ S This refers to the active power flow of the target SSW that has been requested to be opened. When the controller converges, all terms on the right-hand side of the voltage control variable calculation formula are zero. At this point, different regulatory measures can be taken for the specified operating mode, such as:

[0116] When λ i =0, η i When the value is 0, the DG operates in static mode, and the system topology is static. The average voltage of the DG is adjusted according to the rated value. The load is shared proportionally by each DG, such as ΔP′. ij =0.

[0117] When λ i =1, η i When |V| = 0, the target SSW is required to be turned off, and DG is in transition mode. This is because |V| on both sides... S |=V * At this time, in addition to the secondary adjustment of the proportional power sharing of DG, the voltages on both sides of the target SSW are synchronized, and the transients caused by the reopened target SSW are suppressed.

[0118] When λ i =0, η i When ΔP' = 1, the target SSW is required to be turned on, and DG is in transition mode. This is because ΔP' S =0, at this point, in addition to secondary voltage regulation, the power through the target SSW is also minimized, and the transients caused by reopening the closed SSW are also suppressed. Similar to the AC subgrid, power sharing between DGs is disabled when the target SSW is turned on.

[0119] Step S403: The second coordination controller adjusts the operating voltage of the second distributed power supply based on the target operating voltage and the second control mode.

[0120] In practical applications, the topology transformation control variable λ can first be determined based on the current switching state of the target smart switch and the system operating mode. i and ηi The value of the voltage control variable can be obtained by substituting it into the calculation formula of the voltage control variable. Then, the voltage control variable can be substituted into the control mode corresponding to the pre-designed second coordinating controller, and the target operating voltage of the second distributed power source can be calculated by combining the third droop gain, the reference voltage of the second distributed power source, and the second active power output value. Finally, the operating voltage of the second distributed power source is adjusted by the second coordinating controller based on the target operating voltage.

[0121] Furthermore, an interconnecting converter is provided between the AC subgrid and the DC subgrid, and the method further includes:

[0122] Step S50: Determine the third control mode corresponding to the interconnect converter based on the second control mode.

[0123] In this embodiment, compared to the AC and DC subgrids, the interconnecting converters have different operating characteristics. They adjust the grid's power output to achieve system power balance between generation and consumption, and the power transmitted through the interconnecting converters can be controlled more flexibly. As long as the active power transmitted between the AC and DC subgrids of each interconnecting converter is balanced, the interconnecting converter can adjust its DC-side operating voltage according to its design under normal conditions. Therefore, it is feasible to regulate the DC-side operating voltage of each interconnecting converter in conjunction with the control device of the DG in the DC subgrid.

[0124] It should be noted that the control of the interconnecting converter in this scheme is designed to be unified with the control of the grid-connected distributed generation (DG) in the DC subgrid, and its active power output is coupled to its operating DC voltage. Specifically, the DC-side operating voltage of each interconnecting converter is adjusted according to the PV droop relationship and the developed secondary control. In this embodiment, the controller of the i-th interconnecting converter can be unified with the controller of the DG in the DC subgrid, that is, the third control method in the interconnecting converter can be determined by the second control method adopted in the DC subgrid.

[0125] Step S60: Adjust the grid power output based on the third control method through the interconnect converter.

[0126] Specifically, step S60 includes: obtaining a third active power output value and a fourth droop gain of the interconnect converter, wherein the fourth droop gain is used to represent the relationship between the active power and voltage of the interconnect converter; determining the DC-side operating voltage of the interconnect converter based on the DC voltage control variable corresponding to the interconnect converter, the third active power output value and the fourth droop gain; and adjusting the grid power output by the interconnect converter based on the DC-side operating voltage and the third control method.

[0127] It should be noted that the third control method corresponding to the interconnect converter in this embodiment can be specifically designed as follows:

[0128]

[0129] Among them, V i,IC For the aforementioned DC-side operating voltage, n i,Ic The PV droop gain designed for the i-th interconnect converter (i.e., the fourth droop gain mentioned above); P i,Ic Let ΔV be the active output power of the i-th interconnect converter. i,IC This refers to the secondary control variable (i.e., the DC voltage control variable mentioned above). As shown in the equation above, the interconnecting converter in this scheme is designed to participate in the secondary regulation of the DC subgrid, ΔV i ΔP′ ij ΔV S and ΔP′ S The definition is the same as that in the calculation formula for voltage control variables. Specifically, the interconnected converter will share its DC-side operating voltage with other interconnected converters and grid-connected DGs in the DC subgrid for secondary voltage regulation, which can be achieved through ΔV. i This is reflected in ΔP; they also share their respective power outputs, proportionally supporting the load of the DC subgrid, which is reflected in ΔP. i j j Furthermore, interconnect converters can suppress transients caused by switching operations, thereby facilitating seamless topology transitions in DC subgrids. The patterns of these transients can be observed through ΔV. S and ΔP′ S It is reflected in.

[0130] It should be noted that, as shown in the formula corresponding to the third control method, the active power flow of each node is determined by the operating state of the DC subgrid. In each interconnecting converter, no regulation of the active power flow on the AC side is introduced to balance the power transfer between the AC and DC subgrids. In the AC subgrid, the interconnecting converters operate as voltage source inverters in current control mode (VSI-CCM); they are considered to have unschedulable active power output and controllable reactive power output. In this scheme, to simplify the communication structure and avoid cyclic reactive power flow, a local PI controller can be used to adjust the reactive power output of each interconnecting converter in the AC subgrid to zero:

[0131]

[0132] In the formula, Q′ i,IC and Q i,IC These represent the reference reactive power output and the operating reactive power output at the i-th interconnect converter, respectively.

[0133] It should be understood that the control scheme proposed in this paper relies on point-to-point communication and does not require global information exchange. The reference values ​​in all the above formulas are general parameters used in decentralized droop control, and the binary variable λ that determines each DG operating mode... i and η i Essentially, updates are performed by the system operator, a characteristic dictated by the nature of the network reconfiguration problem. For λ on each DG... i and η i The updates can be easily accomplished using distributed algorithms based on dynamic consensus.

[0134] In practical implementations, state-of-the-art distributed hardware controllers operate in a discrete manner, meaning the controller iterates over a constant time step. Algorithms developed in the continuous time domain should be discretized before implementation on a digital controller, compared to control algorithms initially developed in the discrete time domain. In practical applications, it is feasible to implement algorithms designed in the continuous time domain in a discretized manner, provided the communication bandwidth is high enough to mitigate the impact of discretization.

[0135] In this embodiment, the voltage control variable corresponding to the second coordinating controller is determined based on the topology transformation control variable value; the target operating voltage of the second distributed power source is determined based on the voltage control variable; and the operating voltage of the second distributed power source is adjusted by the second coordinating controller based on the target operating voltage and the second control method, thereby achieving precise adjustment of the operating voltage of the second distributed power source so as to achieve seamless topology transformation in the future.

[0136] It should be noted that the above examples are only for understanding this application and do not constitute a limitation on the power distribution network control method of this application. Any simple modifications based on this technical concept are within the protection scope of this application.

[0137] This application also provides a power distribution network control device, please refer to... Figure 7 The device includes an AC / DC hybrid power distribution system, which is divided into several minimum AC / DC hybrid sub-networks by intelligent switches. The device comprises:

[0138] The control mode determination module 10 is used to determine the first control mode of the first coordinating controller corresponding to the first distributed power source in the AC subgrid, and the second control mode of the second coordinating controller corresponding to the second distributed power source in the DC subgrid.

[0139] The control variable value determination module 20 is used to determine the topology conversion control variable value based on the switch state and system operation mode corresponding to the target smart switch.

[0140] The operating parameter adjustment module 30 is used to adjust the operating frequency and operating voltage of the first distributed power source based on the topology conversion control variable value and the first control mode through the first coordination controller;

[0141] The operating parameter adjustment module 30 is also used to adjust the operating voltage of the second distributed power supply based on the topology conversion control variable value and the second control mode through the second coordination controller.

[0142] The power distribution network control device provided in this application, employing the power distribution network control method in the above embodiments, can solve the technical problem in the prior art where unnecessary transients occur during topology switching in AC / DC hybrid power distribution systems based on static topology, leading to reduced system operational flexibility or cascading failures. Compared with the prior art, the beneficial effects of the power distribution network control device provided in this application are the same as those of the power distribution network control method provided in the above embodiments, and other technical features in the power distribution network control device are the same as those disclosed in the methods of the above embodiments, and will not be repeated here.

[0143] This application provides a power distribution network control device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the power distribution network control method in the above embodiment 1.

[0144] The following is for reference. Figure 8 This document illustrates a structural schematic diagram of a power distribution network control device suitable for implementing embodiments of this application. The power distribution network control device in these embodiments may include, but is not limited to, mobile terminals such as mobile phones, laptops, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Description), PMPs (Portable Media Players), and vehicle terminals (e.g., vehicle navigation terminals), as well as fixed terminals such as digital TVs and desktop computers. Figure 8 The power distribution network control device shown is merely an example and should not impose any limitations on the functionality and scope of use of the embodiments of this application.

[0145] like Figure 8As shown, the power distribution network control device may include a processing unit 1001 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 1002 or a program loaded from a storage device 1003 into a random access memory (RAM) 1004. The RAM 1004 also stores various programs and data required for the operation of the power distribution network control device. The processing unit 1001, ROM 1002, and RAM 1004 are interconnected via a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems can be connected to the I / O interface 1006: input devices 1007 including, for example, a touchscreen, touchpad, keyboard, mouse, image sensor, microphone, accelerometer, gyroscope, etc.; output devices 1008 including, for example, a liquid crystal display (LCD), speaker, vibrator, etc.; storage devices 1003 including, for example, magnetic tape, hard disk, etc.; and communication devices 1009. Communication device 1009 allows the power distribution network control equipment to communicate wirelessly or wiredly with other equipment to exchange data. Although the figure shows power distribution network control equipment with various systems, it should be understood that implementation or possession of all the systems shown is not required. More or fewer systems may be implemented alternatively.

[0146] Specifically, according to the embodiments disclosed in this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments disclosed in this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device, or installed from storage device 1003, or installed from ROM 1002. When the computer program is executed by processing device 1001, it performs the functions defined in the methods of the embodiments disclosed in this application.

[0147] The power distribution network control device provided in this application, employing the power distribution network control method in the above embodiments, can solve the technical problems of power distribution network control. Compared with the prior art, the beneficial effects of the power distribution network control device provided in this application are the same as those of the power distribution network control method provided in the above embodiments, and other technical features in this power distribution network control device are the same as those disclosed in the method of the previous embodiment, and will not be repeated here.

[0148] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0149] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0150] This application provides a computer-readable storage medium having computer-readable program instructions (i.e., a computer program) stored thereon, the computer-readable program instructions being used to execute the power distribution network control method in the above embodiments.

[0151] The computer-readable storage medium provided in this application may be, for example, a USB flash drive, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system, or device. The program code contained on the computer-readable storage medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0152] The aforementioned computer-readable storage medium may be included in the power distribution network control equipment; or it may exist independently and not be assembled into the power distribution network control equipment.

[0153] The aforementioned computer-readable storage medium carries one or more programs that, when executed by a power distribution network control device, cause the power distribution network control device to: determine a first control mode of a first coordinating controller corresponding to a first distributed power source in an AC subgrid, and a second control mode of a second coordinating controller corresponding to a second distributed power source in a DC subgrid; determine topology conversion control variable values ​​based on the switch state and system operating mode of a target smart switch; adjust the operating frequency and operating voltage of the first distributed power source by the first coordinating controller based on the topology conversion control variable values ​​and the first control mode; and adjust the operating voltage of the second distributed power source by the second coordinating controller based on the topology conversion control variable values ​​and the second control mode.

[0154] Computer program code for performing the operations of this application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a Local Area Network (LAN) or a Wide Area Network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0155] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0156] The modules described in the embodiments of this application can be implemented in software or hardware. The names of the modules do not necessarily limit the functionality of the unit itself.

[0157] The readable storage medium provided in this application is a computer-readable storage medium that stores computer-readable program instructions (i.e., a computer program) for executing the above-described power distribution network control method. This solves the technical problem in the prior art where static topology-based AC / DC hybrid power distribution systems generate unwanted transients during topology transitions, leading to reduced system operational flexibility or cascading failures. Compared to the prior art, the beneficial effects of the computer-readable storage medium provided in this application are the same as those of the power distribution network control method provided in the above embodiments, and will not be repeated here.

[0158] The above description is only a part of the embodiments of this application and does not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A power distribution network control method characterized by, The method is applied to an AC / DC hybrid power distribution system, which is divided into several minimum AC / DC hybrid sub-networks by intelligent switches. The method includes: Determine the first control mode of the first coordination controller corresponding to the first distributed power source in the AC subgrid, and the second control mode of the second coordination controller corresponding to the second distributed power source in the DC subgrid; The topology conversion control variable values ​​are determined based on the switch status and system operation mode of the target smart switch. The first coordinating controller adjusts the operating frequency and operating voltage of the first distributed power source based on the topology conversion control variable value and the first control method. The second coordinating controller adjusts the operating voltage of the second distributed power source based on the topology transformation control variable value and the second control method.

2. The method of claim 1, wherein, The step of adjusting the operating frequency and operating voltage of the first distributed power source by the first coordination controller based on the topology transformation control variable value and the first control mode includes: Based on the topology transformation control variable values, determine the frequency control variable and voltage amplitude control variable corresponding to the first coordination controller; The target operating frequency and target operating voltage amplitude of the first distributed power source are determined based on the frequency control variable and the voltage amplitude control variable, respectively. The first coordination controller adjusts the operating frequency and operating voltage of the first distributed power source based on the target operating frequency, the target operating voltage amplitude, and the first control method.

3. The method of claim 2, wherein, The step of determining the target operating frequency and target operating voltage amplitude of the first distributed power source based on the frequency control variable and the voltage amplitude control variable respectively includes: Obtain the reference frequency, reference voltage amplitude, first active power output value, and reactive power output value of the first distributed power source; The target operating frequency of the first distributed power source is determined based on the first droop gain, the reference frequency, the first active power output value, and the frequency control variable. The first droop gain is used to represent the relationship between the active power and the frequency of the first coordination controller. The target operating voltage amplitude of the first distributed power source is determined based on the second droop gain, the reference voltage amplitude, the reactive power output value, and the voltage amplitude control variable. The second droop gain is used to represent the relationship between the reactive power and frequency of the first coordination controller.

4. The method of claim 1, wherein, The step of adjusting the operating voltage of the second distributed power source by the second coordination controller based on the topology transformation control variable value and the second control mode includes: The voltage control variable corresponding to the second coordination controller is determined based on the value of the topology transformation control variable. The target operating voltage of the second distributed power source is determined based on the voltage control variables. The second coordinating controller adjusts the operating voltage of the second distributed power source based on the target operating voltage and the second control method.

5. The method of claim 4, wherein, The step of determining the target operating voltage of the second distributed power source based on the voltage control variable includes: Obtain the reference voltage and the second active power output value of the second distributed power source; The target operating voltage of the second distributed power source is determined based on the third droop gain, the reference voltage, the second active power output value, and the voltage control variable. The third droop gain is used to represent the relationship between the active power and voltage of the second coordinated controller.

6. The method of any one of claims 1 to 5, wherein, An interconnecting converter is provided between the AC subgrid and the DC subgrid, and the method further includes: The third control method corresponding to the interconnect converter is determined based on the second control method; The power output of the grid is adjusted by the interconnecting converter based on the third control method.

7. The method of claim 6, wherein, The step of adjusting the grid power output through the interconnect converter based on the third control method includes: Obtain the third active power output value and the fourth droop gain of the interconnect converter, wherein the fourth droop gain is used to represent the relationship between the active power and voltage of the interconnect converter; The DC-side operating voltage of the interconnect converter is determined based on the DC voltage control variable corresponding to the interconnect converter, the third active power output value, and the fourth droop gain. The grid power output is adjusted by the interconnect converter based on the DC-side operating voltage and the third control method.

8. A power distribution network control device, characterized by, The device includes an AC / DC hybrid power distribution system, which is divided into several minimum AC / DC hybrid sub-networks by intelligent switches. The device comprises: The control mode determination module is used to determine the first control mode of the first coordination controller corresponding to the first distributed power source in the AC subgrid, and the second control mode of the second coordination controller corresponding to the second distributed power source in the DC subgrid. The control variable value determination module is used to determine the topology conversion control variable value based on the switch state corresponding to the target smart switch and the system operating mode. The operating parameter adjustment module is used to adjust the operating frequency and operating voltage of the first distributed power source based on the topology conversion control variable value and the first control method through the first coordination controller; The operating parameter adjustment module is also used to adjust the operating voltage of the second distributed power source based on the topology conversion control variable value and the second control mode through the second coordination controller.

9. A power distribution network control device, characterized by, The device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the power distribution network control method as described in any one of claims 1 to 7.

10. A storage medium, characterized in that, The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, it implements the steps of the power distribution network control method as described in any one of claims 1 to 7.

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