An active power distribution network voltage control method and system for suppressing the impact of communication interruption

Abstract

The application provides an active power distribution network voltage control method and system for inhibiting communication interruption influence, comprising the following steps: judging a communication interruption node position based on communication information of each node, and finding a normally communicating node closest to the interruption node position; collecting multi-dimensional information of the active power distribution network, and calculating a voltage amplitude of the interruption node based on the multi-dimensional information; bringing the multi-dimensional information and the voltage amplitude of the interruption node into a pre-constructed multi-node Q-V droop control model to obtain reactive power needed to be compensated by each voltage out-of-limit node; and issuing the reactive power needed to be compensated by each voltage out-of-limit node to the normally communicating node with voltage regulating capacity; wherein the multi-node Q-V droop control model is constructed based on the principle that the main grid power supply remains unchanged. The technical scheme of the application realizes on-site voltage regulation by using the multi-node Q-V droop control model, and further realizes more fine control effect on the voltage out-of-limit node.

Description

Technical Field

[0001] This invention relates to the field of active distribution network voltage control, and specifically to an active distribution network voltage control method and system for suppressing the impact of communication interruptions. Background Technology

[0002] Currently, voltage control strategies in power distribution networks can be mainly divided into three types: centralized, distributed, and local control.

[0003] Centralized voltage control uses a master station system to input all status information from all nodes in the network, processes it with appropriate control strategies, and then sends control commands to the voltage regulating equipment terminals at each voltage regulating node. Centralized voltage control is highly dependent on communication systems, requiring significant communication resources. It needs to collect global information, perform optimization calculations, and then issue corresponding commands, so the processing time is often very long, generally on the order of hours, making it difficult to track voltage fluctuations in real time and respond promptly.

[0004] The characteristic of distributed voltage control is its multi-centralization. There is no single master station system to collect global information, calculate and issue various commands. Instead, it relies on multiple master station systems to collect local state information of the distribution network, and then control the voltage regulating equipment in different areas to control the voltage. This reduces the dependence on the communication system and improves the response speed.

[0005] Local voltage control, also known as distributed voltage control, is characterized by not relying on communication systems. It uses the voltage at the monitoring point as a variable and performs voltage control through local operation. It is currently the most widely used control method. However, voltage control based on local information cannot effectively solve the voltage problem of the entire network from a global perspective, and its final regulation result may not reach the optimal level.

[0006] Currently, the most widely used voltage control method in distribution networks is local voltage control, which does not rely on communication systems. It uses the voltage at monitoring points as a variable and controls voltage through local operation, thus avoiding communication interruptions. However, with the widespread integration of distributed generation into distribution networks, its randomness and volatility significantly impact voltage quality. This necessitates active control for voltage management, encompassing both centralized and distributed voltage control. Furthermore, the greater the volatility of distributed generation, the higher the voltage control density and the greater the reliance on information systems. Any communication interruption will inevitably affect voltage control effectiveness and consequently voltage quality, failing to improve voltage quality and potentially worsening it. Summary of the Invention

[0007] To address the problem that existing local voltage control technologies cannot provide precise control over the voltage of all voltage-over-limit nodes, this invention proposes an active distribution network voltage control method to suppress the impact of communication interruptions, comprising:

[0008] Based on the communication information of each node, determine the location of the node whose communication was interrupted and the node with normal communication that is closest to the interrupted node;

[0009] Collect multi-dimensional information of the active power distribution network and calculate the voltage amplitude of the interruption node based on the multi-dimensional information;

[0010] Based on the multidimensional information and the voltage amplitude of the interruption node, the reactive power that needs to be compensated for each voltage over-limit node is obtained by inputting it into the pre-constructed multi-node QV droop control model.

[0011] The reactive power compensation required for each voltage over-limit node is distributed to nodes with voltage regulation capabilities.

[0012] The multi-node QV droop control model is constructed based on the principle that the main grid power supply remains unchanged, ignoring the changes in line power loss between nodes.

[0013] Preferably, the step of distributing the reactive power compensation required for each voltage-over-limit node to the normally communicating node with voltage regulation capability includes:

[0014] Determine whether the voltage over-limit node has voltage regulation capability;

[0015] When the voltage over-limit node has voltage regulation capability, the reactive power that the voltage over-limit node needs to compensate is sent to the voltage over-limit node.

[0016] When the voltage over-limit node does not have voltage regulation capability, the load shifting algorithm is used to shift the reactive power that the voltage over-limit node needs to compensate to the nearest normally communicating node with voltage regulation capability.

[0017] Preferably, the step of using a load shifting algorithm to shift the reactive power that needs compensation from the voltage-over-limit node to the nearest normally communicating node with voltage regulation capability includes:

[0018] According to the load shifting algorithm, the load at the voltage over-limit node without voltage regulation capability is shifted to two adjacent nodes. When the two adjacent nodes do not have voltage regulation capability, the load of the two adjacent nodes continues to be shifted to their respective two adjacent nodes until the load is shifted to the normally communicating node with voltage regulation capability. The injected power of the two adjacent normally communicating nodes with voltage regulation capability to which the load is shifted is calculated.

[0019] Preferably, the injected power of the two adjacent normally communicating nodes with voltage regulation capability is calculated using the following formula:

[0020]

[0021]

[0022] In the formula, and P represents the conjugate of the line impedances between nodes i and k and between nodes k and j, respectively. i and P j Q represents the active power at nodes i and j, respectively. i and Q j These represent the reactive power at nodes i and j, respectively, where i and j are nodes. k Let Q be the active power at node k. k Let be the reactive power of node k.

[0023] Preferably, the multi-node QV droop control model is shown in the following equation:

[0024]

[0025] In the formula, U i U is the voltage value at node i. i-1 and U i+1 They are respectively in U position in terms of electrical connection relationship i The voltage values ​​of the previous and next stages, Q ci U is the reactive power that needs to be compensated for when a node exceeds its limit. ic U is the voltage value after voltage regulation at node i. (i+1)c U represents the voltage value after voltage regulation at node i+1. (i-1)c X represents the voltage value after voltage regulation at node i-1. i X is the reactance between node i and node i-1. i+1 Let be the reactance between node i+1 and node i.

[0026] Preferably, the step of determining the location of the communication interruption node and the nearest normally communicating node based on the communication information of each node includes:

[0027] Based on the communication information of each node, nodes with a voltage value of 0 are identified as nodes with communication interruption.

[0028] Based on the interrupted node, find the node with normal communication that is closest to the interrupted node.

[0029] Preferably, calculating the voltage amplitude of the interrupted node based on the multidimensional information includes:

[0030] The voltage amplitude of the interrupted node is calculated using the multidimensional information and power flow calculation.

[0031] The multidimensional information includes voltage, power, and voltage amplitude.

[0032] Based on the same inventive concept, the present invention also provides an active power distribution network voltage control system for suppressing the impact of communication interruptions, comprising:

[0033] The positioning module is used to determine the location of the communication interruption node and the closest normal communication node based on the communication information of each node;

[0034] The data acquisition and calculation module is used to acquire multi-dimensional information of the active power distribution network and calculate the voltage amplitude of the interruption node based on the multi-dimensional information.

[0035] The reactive power calculation module is used to input the multi-dimensional information and the voltage amplitude of the interrupted node into a pre-built multi-node QV droop control model to obtain the reactive power that needs to be compensated for each voltage over-limit node.

[0036] The distribution module is used to distribute the reactive power compensation required for each voltage over-limit node to the normally communicating node with voltage regulation capability.

[0037] The multi-node QV droop control model is constructed based on the principle that the main grid power supply remains unchanged.

[0038] Preferably, the allocation module includes:

[0039] The judgment submodule is used to determine whether the voltage over-limit node has voltage regulation capability;

[0040] The task distribution submodule is used to distribute the reactive power that the voltage over-limit node needs to compensate to the voltage over-limit node when the voltage over-limit node has voltage regulation capability; when the voltage over-limit node does not have voltage regulation capability, the load shifting algorithm is used to shift the reactive power that the voltage over-limit node needs to compensate to the nearest normally communicating node with voltage regulation capability.

[0041] Preferably, the positioning module includes:

[0042] The judgment submodule is used to determine nodes with a voltage value of 0 as communication interruption nodes based on the communication information of each node.

[0043] The search submodule is used to find the nearest normally communicating node based on the interrupted node.

[0044] Furthermore, this application also provides a computing device, comprising: one or more processors;

[0045] A processor is used to execute one or more programs;

[0046] When the one or more programs are executed by the one or more processors, an active power distribution network voltage control method for suppressing the impact of communication interruptions, as described above, is implemented.

[0047] In another aspect, this application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed, implements an active power distribution network voltage control method for suppressing the impact of communication interruptions as described above.

[0048] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0049] This invention provides an active distribution network voltage control method to suppress the impact of communication interruptions, comprising: determining the location of a communication interruption node and the nearest normally communicating node based on the communication information of each node; collecting multi-dimensional information of the active distribution network and calculating the voltage amplitude of the interruption node based on the multi-dimensional information; inputting the multi-dimensional information and the voltage amplitude of the interruption node into a pre-constructed multi-node QV droop control model to obtain the reactive power compensation required for each voltage-over-limit node; and distributing the reactive power compensation required for each voltage-over-limit node to normally communicating nodes with voltage regulation capabilities; wherein, the multi-node QV droop control model is constructed based on the principle of keeping the main grid power supply unchanged, ignoring the changes in line power loss between nodes. The technical solution of this invention uses a multi-node QV droop control model to achieve a more refined control effect for voltage-over-limit nodes. Attached Figure Description

[0050] Figure 1 This is a flowchart of an active power distribution network voltage control method for suppressing the impact of communication interruptions according to the present invention;

[0051] Figure 2 This is a flowchart of the voltage control procedure under communication interruption conditions according to the present invention;

[0052] Figure 3 This is a schematic diagram of the single radial network structure before voltage regulation in this invention;

[0053] Figure 4 This is a schematic diagram of the single-radial network structure after voltage regulation according to the present invention;

[0054] Figure 5 This is a schematic diagram of the network structure before load shifting according to the present invention;

[0055] Figure 6 This is a schematic diagram of the network structure after load shifting according to the present invention;

[0056] Figure 7 The voltage regulation task of the non-voltage regulating node of the present invention is relocated;

[0057] Figure 8 This is a schematic diagram of the IEEE 33-bus distribution network model of the present invention;

[0058] Figure 9 This is a waveform diagram simulating an unprocessed communication interruption on an IEEE 33-bus distribution network model, based on the present invention.

[0059] Figure 10 This is a waveform diagram of multi-point voltage regulation after simulating a communication interruption on an IEEE 33-bus power distribution network model, according to the present invention. Detailed Implementation

[0060] This invention proposes an active distribution network voltage control method that mitigates the impact of communication interruptions. This method can achieve more precise control of voltage-limited nodes due to the large-scale distributed power generation in the network. It also addresses the issue that voltage regulation of multiple load nodes is necessary simultaneously, but not every load node has the capability to regulate voltage. Relying solely on local voltage control makes it difficult to achieve precise voltage control for all voltage-limited nodes. Therefore, this invention proposes an active distribution network voltage control method that suppresses the impact of communication interruptions. This method can achieve more precise control of voltage-limited nodes and, to some extent, resist the impact of communication interruptions on the voltage regulation process, thus achieving the goal of precise control even when there is no voltage regulation equipment at the voltage-limited nodes.

[0061] Example 1:

[0062] An active distribution network voltage control method to suppress the impact of communication interruptions, such as Figure 1 As shown:

[0063] S1: Based on the communication information of each node, determine the location of the communication interruption node and the node with normal communication closest to the interruption node;

[0064] S2: Collect multi-dimensional information of the active power distribution network and calculate the voltage amplitude of the interruption node based on the multi-dimensional information;

[0065] S3: Based on the multidimensional information and the voltage amplitude of the interrupted node, input the pre-built multi-node QV droop control model to obtain the reactive power that needs to be compensated for each voltage over-limit node;

[0066] S4: Distribute the reactive power compensation required for each voltage over-limit node to the normally communicating node with voltage regulation capability;

[0067] The multi-node QV droop control model is constructed based on the principle that the main grid power supply remains unchanged, ignoring the changes in line power loss between nodes.

[0068] The following is combined with Figure 2 The present invention will be described in detail as follows:

[0069] S1 determines the location of the communication interruption node and the nearest normally communicating node based on the communication information of each node, specifically including:

[0070] Step 1: The master station determines the location of the communication interruption node based on the communication information uploaded by the physical layer nodes.

[0071] Step 2: The master station uses the node number and network topology to determine the nearest working communication node to the communication interruption point.

[0072] S2 involves acquiring multi-dimensional information about the active power distribution network and calculating the voltage amplitude of the interrupted node based on this multi-dimensional information. Specifically, this includes:

[0073] Step 3: Collect multi-dimensional information including voltage and power. The main station calculates the voltage amplitude at the communication interruption point based on the collected information and completes the voltage information of all network nodes.

[0074] Before S3, the construction of a multi-node QV droop control model is also included, and the specific steps are as follows:

[0075] The multi-node QV droop control method proposed in this invention is derived based on the principle of maintaining a constant main grid power supply voltage, as follows:

[0076] Figure 3 It is a single radial network (before voltage regulation). Figure 4 For a single-radial network (after voltage regulation), assuming several load nodes experience voltage fluctuations exceeding the allowable range, and each node has voltage regulation capability, then the QV droop control model for each voltage-regulated node is as follows:

[0077]

[0078]

[0079] P n Q n and U i These represent the active load, reactive load, voltage (RMS), and R of each node. j and X j Let P' be the resistance and reactance between node j and node j-1. j Q′ j The active and reactive power injected into each load node, ΔS zn U0 represents the power loss on the line between load nodes, which is the starting voltage, equivalent to the main grid power supply, and remains constant. n represents the number of voltage regulating nodes.

[0080]

[0081] In equation (3) Uic Q is the voltage after voltage regulation at node i. ci This refers to the reactive power injected (absorbed) by the voltage regulating equipment at each voltage regulating node after QV droop control (i.e., the voltage regulating task mentioned below). Wherein ΔP′ zj , ΔQ′ zj respectively The change in line power loss between corresponding nodes after reactive power is injected (absorbed) into the voltage regulating equipment is shown in equation (4):

[0082]

[0083] It can be seen from equations (3) and (4) that ΔP′ zj and ΔQ′ zj The order of magnitude is much smaller than P′ j and Q′ j That is, the change in line power loss between nodes caused by the reactive power injected (absorbed) by the voltage regulating equipment is much smaller than the injected power at this node. Therefore, from the perspective of quantitative relationships and simplifying the control model, ΔS′ can be ignored. zj =ΔP′ zj +jΔQ′ zj Equation (3) can be simplified to Equation (5):

[0084]

[0085] Equations (2) and (5) here are both n-dimensional equation systems. By solving equations (2) and (5) simultaneously, the QV droop control model for each voltage-regulating node can be obtained as follows:

[0086]

[0087] For nodes where no voltage limit is exceeded, the corresponding Q... ci It can be set to 0 to avoid unnecessary voltage adjustment operations. It is worth noting that U in equation (6) i U i-1 and U i-1 It is not a numerical order based on subscripts, but rather a hierarchical order based on electrical connections, i.e., U i-1 and U i-1 They are respectively in U position in terms of electrical connection relationship i The parent and child levels. This is important to note in radial networks with branching paths.

[0088] In S3, based on the multi-dimensional information and the voltage amplitude of the interrupted node, the pre-constructed multi-node QV droop control model is used to obtain the reactive power compensation required for each voltage-over-limit node, specifically including:

[0089] Step 4: After completing the network voltage information, substitute it into the multi-node QV droop control model to obtain the reactive power compensation required for each voltage over-limit node.

[0090] S4 involves distributing the reactive power compensation required for each voltage-over-limit node to nodes with voltage regulation capabilities, specifically including:

[0091] The above derivation is based on the assumption that each load node has voltage regulating equipment for voltage regulation. However, this condition does not hold true in the actual power grid. But from another perspective, equation (6) is equivalent to issuing a voltage regulation task to each load node when several nodes in the entire network exceed their limits. If node i does not have voltage regulation capability, then the voltage regulation task at node i needs to be undertaken by the nearest voltage regulating node. To achieve this, the load shifting method is introduced, and its principle is as follows.

[0092] Step 5: If a voltage-over-limit node does not have voltage regulation capability, then find the nearest node with voltage regulation capability based on the node number and network topology, and start the load shifting algorithm to shift the reactive power compensation task calculated here to the nearest node with voltage regulation capability.

[0093] Figure 5 For a power line with three nodes, the load at node k can be moved to adjacent nodes i and j using the load shifting method. The injected power at nodes i and j after the load shift is as follows:

[0094]

[0095]

[0096] in, and These are the conjugates of the line impedances between nodes i and k, and between nodes k and j, respectively. They satisfy... and

[0097] Using the above principle, the voltage regulation task undertaken by a node without voltage regulation capability can be transferred to a nearby voltage regulation node through a finite number of load transfers, such as... Figure 6 As shown.

[0098] Step 6: The master station sends the calculation results, i.e. the reactive power that each voltage regulating node needs to compensate, to each voltage regulating node to achieve fine control of each voltage over-limit node in the entire network.

[0099] The steps in the above process can be expressed in the form of a piecewise function as follows:

[0100]

[0101] Where L represents the communication link status between the master station and the terminal at node i-1 / i+1, and is a 0-1 variable, where 1 indicates that the communication link is working and 0 indicates that the communication link is broken. U j For distance from U i-1 The most recent load node voltage value, where m is the number of nodes between node j and node i-1, and the corresponding node load is P. m +jQ m The line impedance is R m +jX m The voltage value is U m .

[0102] The diagram shows an arbitrary segment of a power distribution network, where only nodes i and j have voltage regulation capabilities; the nodes in between do not. However, after ji-1 load relocations, the voltage regulation task of all nodes on this segment can be entirely distributed to voltage regulation nodes i and j, as shown below. Figure 7 As shown, the specific shifting process can be illustrated by the following pseudocode:

[0103]

[0104] The parameter t represents the number of migrations, with node i as the starting point and node j as the ending point. Each migration updates the voltage regulation task S at node i and node i+t+1. ci =P ci +jQ ci and S c(i+t+1) =P c(i+t+1) +jQ c(i+t+1) Simultaneously update the impedance Z between node i+t and node i. i+t This is equivalent to the voltage regulation task S for each node after each porting. ci In this regard, the impedance between node i and node i+t will be combined with the impedance between node i+t and node i+t+1, thus decomposing the voltage regulation task at node i+t and eliminating this node (for...). In this way, the voltage regulation task of the non-voltage regulating nodes on the entire line can be distributed to the voltage regulating nodes i and j. In this way, during the execution of the voltage regulation task, the reactive power injected (absorbed) into the network by each voltage regulating node will be distributed to each load node in reverse according to the principle of load shifting, so as to achieve more precise voltage control.

[0105] Equation (6) and the load shifting method together constitute the multi-node QV droop control method proposed in this paper. It can be seen that the determination of the voltage regulation task of each load node in the multi-node QV droop control model requires at least three quantities: the effective value of the voltage of this node before voltage regulation, and the effective values ​​of the voltage of the previous and next level nodes. This requires mutual perception between voltage regulation nodes in the distribution network. This depends on the communication network in the distribution cyber-physical system and is more susceptible to external communication attacks and internal communication failures.

[0106] When communication is interrupted at certain nodes, since there is no fault at the physical layer and no change in the electrical relationship, the voltage information of the faulty node can be calculated and voltage regulation can be performed using the voltage value and load power information of the normal nodes that have not experienced communication interruption, as well as fixed known information including system topology information and line parameter information.

[0107] When performing multi-node QV droop control on various voltage-over-limit nodes, if communication between several nodes is interrupted, it will inevitably affect the voltage regulation operation of adjacent nodes. To mitigate the impact of node communication interruptions on voltage regulation, a master station system is needed to grasp global information. Therefore, this paper proposes a master station centralized voltage control mode, in which each node uploads its voltage and power information to the master station. When communication is interrupted, the master station calculates the voltage data at the communication interruption point based on the global information of each node it possesses, completes the voltage information of the entire network, and then performs normal voltage regulation operation at the corresponding voltage-over-limit nodes, thereby mitigating the impact of communication interruptions.

[0108] This invention proposes an active distribution network voltage control method to suppress the impact of communication interruptions. The core of this method lies in a multi-node QV droop control model and control flow. The control model relies on the master station, and the control flow relies on the cooperation between the master station and the voltage regulating equipment. The main function of the voltage regulating equipment is to receive commands from the master station and issue or absorb corresponding reactive power to achieve voltage control. The function of the voltage regulating equipment can be abstracted as a signal receiver plus a static var compensator (SVC). Relying on the SVC's ability to smoothly change its output reactive power, it can issue or absorb corresponding reactive power according to the reactive power output commands received from the signal receiver, achieving smooth voltage control.

[0109] The technical solution of the present invention has the ability to regulate the voltage of multiple nodes simultaneously. While controlling the voltage over-limit node, it does not affect other normal nodes, thus achieving fine control of the voltage over-limit node.

[0110] Even when there is no voltage regulating device at the voltage over-limit node, the present invention can use the load shifting method to send the result calculated by the master station based on the multi-node QV droop model (i.e., the reactive power compensation required for voltage regulation at the voltage over-limit node) to the adjacent node with voltage regulating device, thereby restoring the voltage at the voltage over-limit node to the normal range. The effect is the same as the effect of direct control when there is voltage regulating device at this point.

[0111] In the event of a short-term communication interruption at certain nodes, this invention calculates the voltage at the communication interruption point by collecting multi-dimensional electrical information from nearby nodes with normal communication. Then, following the multi-node QV droop control model and control process, it is still possible to perform normal voltage regulation on nodes with voltage exceeding the limit, thereby restoring their voltage to normal.

[0112] Example 2:

[0113] Experimental simulations were conducted using a distribution network CPS simulation platform and the IEEE 33-bus example. The example... Figure 8 As shown, the voltage of the first-end power source is 10kV and remains constant; specific parameters are provided in the appendix. To illustrate the CPS characteristics of the active distribution network and the scenario of multi-point voltage regulation, it is assumed that all nodes in the network are remotely controlled nodes. Based on the natural voltage distribution, voltage regulation equipment models using the QV droop control method proposed in this paper are set at nodes 5, 17, 25, and 32. Distributed power sources are set at nodes 11, 17, and 32, with output values ​​that are random values ​​with a mean of 200kW + j200kvar and a variance of 100kW + j100kvar. Since the active power fluctuations of the distributed power sources do not affect the frequency compared to the main grid's connected power capacity, this is not relevant to the overall network performance.

[0114] Under normal communication conditions, no communication faults are configured at the communication layer. The master station only monitors the data transmitted from the physical layer model; the specific reactive power voltage regulation calculation is performed automatically by the multi-node QV droop control model, thus achieving local voltage regulation. To demonstrate the difference in results before and after voltage regulation, a 0.1-second reactive power voltage regulation time difference is set. The voltage waveforms collected by the master station at each node, as well as the voltage amplitude waveforms at the terminal nodes 17 and 32 where voltage exceedances are most severe, are shown below. Figure 9 As shown in the figure, it can be seen that the effective voltage values ​​of each load node were originally lower than their rated values, and the voltage values ​​of some nodes had dropped below the nominal voltage (±7%), requiring voltage regulation. After multi-point reactive power voltage regulation, the voltage values ​​of all load nodes can be kept within 7% of the rated value, which shows that the multi-node QV droop control method formulated according to equation (6) and the load shifting principle is correct.

[0115] In the event of a communication interruption between nodes, at least one load node in the physical layer model will fail to receive the voltage value from its upstream load node (treated as 0), resulting in some corresponding load nodes being unable to calculate the correct voltage regulation reactive power value. At this time, the master station will detect a load node with a voltage value of 0, indicating a communication interruption at this point. The master station will then calculate the voltage value at this point according to the procedure described herein. Taking a communication interruption at node 7-16 in the model as an example, if load node 7-16 experiences a communication interruption with node 12 at 0.5 seconds, it will cause errors in the calculation of its corresponding reactive power voltage regulation value. Not only will the voltage of nodes exceeding the limit not be correctly adjusted, but a network-wide voltage collapse will also occur.

[0116] After processing by the method described in this invention, the voltage amplitude of each node in the entire network remained within the allowable range after the communication interruption. Figure 10 As shown, the effectiveness of the proposed method is demonstrated.

[0117] The simulation results show that during the voltage regulation process, if the voltage regulation equipment encounters a communication interruption between nodes, it will issue incorrect voltage regulation commands according to the established strategy. This will not only fail to improve the voltage quality, but will also worsen it, causing severe voltage fluctuations across the entire network and directly threatening the safe and stable operation of the distribution network.

[0118] Meanwhile, due to the large number of nodes in the distribution network, even if some nodes experience communication interruptions, most of the remaining nodes are still operating normally. The voltage information at the communication interruption point can be calculated based on the known information, detectable information, and fixed electrical connection information of the normal nodes, and the voltage can be adjusted correctly. As can be seen from the table, the proposed QV droop control model has achieved good control results. The voltage of each node has not fluctuated significantly due to the communication interruption compared to normal conditions.

[0119] The present invention provides an active distribution network voltage control method to suppress the impact of short-term communication interruptions, which can resist the impact of short-term communication interruptions on centralized voltage control and distributed voltage control methods.

[0120] Example 3:

[0121] Based on the same inventive concept, this invention also provides an active power distribution network voltage control system for suppressing the impact of communication interruptions, comprising:

[0122] The positioning module is used to determine the location of the communication interruption node and the closest normal communication node based on the communication information of each node;

[0123] The data acquisition and calculation module is used to acquire multi-dimensional information of the active power distribution network and calculate the voltage amplitude of the interruption node based on the multi-dimensional information.

[0124] The reactive power calculation module is used to input the multi-dimensional information and the voltage amplitude of the interrupted node into a pre-built multi-node QV droop control model to obtain the reactive power that needs to be compensated for each voltage over-limit node.

[0125] The distribution module is used to distribute the reactive power compensation required for each voltage over-limit node to a normally communicating node with voltage regulation capability.

[0126] The multi-node QV droop control model is constructed based on the principle that the main grid power supply remains unchanged, ignoring the changes in line power loss between nodes.

[0127] The allocation module includes:

[0128] The judgment submodule is used to determine whether the voltage over-limit node has voltage regulation capability;

[0129] The task distribution submodule is used to distribute the reactive power that the voltage over-limit node needs to compensate to the voltage over-limit node when the voltage over-limit node has voltage regulation capability; when the voltage over-limit node does not have voltage regulation capability, the load shifting algorithm is used to shift the reactive power that the voltage over-limit node needs to compensate to the nearest normally communicating node with voltage regulation capability.

[0130] The positioning module includes:

[0131] The judgment submodule is used to determine nodes with a voltage value of 0 as communication interruption nodes based on the communication information of each node.

[0132] The search submodule is used to find the nearest normally communicating node based on the interrupted node.

[0133] For ease of description, the various parts of the above device are described separately as modules or units based on their functions. Of course, in implementing this application, the functions of each module or unit can be implemented in one or more software or hardware components.

[0134] Based on the same inventive concept, in another embodiment of the present invention, a computing device is provided. This computing device includes a processor and a memory. The memory stores a computer program, which includes program instructions. The processor executes the program instructions stored in the computer storage medium. The processor may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing and control core of the terminal, suitable for implementing one or more instructions, specifically suitable for loading and executing one or more instructions in the computer storage medium to achieve a corresponding method flow or corresponding function. The processor described in this embodiment of the present invention can be used to execute the steps of an active power distribution network voltage control method to suppress the impact of communication interruptions.

[0135] Based on the same inventive concept, in another embodiment of the present invention, a storage medium is provided, specifically a computer-readable storage medium (Memory). This computer-readable storage medium is a memory device in a computer device used to store programs and data. It is understood that the computer-readable storage medium here can include both the built-in storage medium in the computer device and extended storage media supported by the computer device. The computer-readable storage medium provides storage space that stores the terminal's operating system. Furthermore, this storage space also stores one or more instructions suitable for loading and execution by a processor. These instructions can be one or more computer programs (including program code). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk storage device. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the corresponding steps of the active power distribution network voltage control method for suppressing the impact of communication interruptions in the above embodiment.

[0136] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0137] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0138] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0139] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0140] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of the claims of the present invention pending approval.

Claims

1. An active power distribution network voltage control method to suppress the effects of communication outages, characterized by, The application comprises the following steps: determining the position of the communication interruption node and the node with normal communication closest to the position of the interruption node based on the communication information of each node; collecting multi-dimensional information of the active power distribution network and calculating the voltage amplitude of the interruption node based on the multi-dimensional information; based on the multi-dimensional information and the voltage amplitude of the interruption node, introducing the pre-constructed multi-node Q-V droop control model to obtain the reactive power required to be compensated by each voltage out-of-limit node; downloading the reactive power required to be compensated by each voltage out-of-limit node to the node with normal communication and voltage regulation capability; wherein the multi-node Q-V droop control model is constructed based on the principle that the main grid power supply remains unchanged and ignores the change amount of line power loss between nodes; the multi-node Q-V droop control model is shown in the following formula: In the formula, U i is the voltage value of the i node, U i-1 and U i+1 are the voltage values of the upper and lower levels of U i in the electrical connection relationship, Q ci is the reactive power that needs to be compensated when the node exceeds the limit, U ic is the voltage value of the i node after voltage regulation, U (i+1)c is the voltage value of the i+1 node after voltage regulation, U (i-1)c is the voltage value of the i-1 node after voltage regulation, X i is the reactance between the i node and the i-1 node, X i+1 is the reactance between the i+1 node and the i node, U 1c is the voltage value of the 1 node after voltage regulation, and U1 is the voltage value of the 1 node.

2. The method of claim 1, wherein, the downloading of the reactive power required to be compensated by each voltage out-of-limit node to the node with normal communication and voltage regulation capability comprises: determining whether the voltage out-of-limit node has voltage regulation capability; when the voltage out-of-limit node has voltage regulation capability, downloading the reactive power required to be compensated by the voltage out-of-limit node to the voltage out-of-limit node; when the voltage out-of-limit node does not have voltage regulation capability, using a load relocation algorithm to relocate the reactive power required to be compensated by the voltage out-of-limit node to the node with normal communication and voltage regulation capability closest to it.

3. The method of claim 2, wherein, the use of the load relocation algorithm to relocate the reactive power required to be compensated by the voltage out-of-limit node to the node with normal communication and voltage regulation capability closest to it comprises: relocating the load at the voltage out-of-limit node without voltage regulation capability to the adjacent two nodes according to the load relocation algorithm, when the adjacent two nodes do not have voltage regulation capability, continuing to relocate the load of the adjacent two nodes to the adjacent two nodes of each, until the load is relocated to the node with normal communication and voltage regulation capability, and calculating the injection power of the adjacent two nodes with normal communication and voltage regulation capability where the load is relocated.

4. The method of claim 3, wherein, the injection power of the adjacent two nodes with normal communication and voltage regulation capability is calculated according to the following formula respectively: wherein, and are the conjugate of the line impedance between nodes i, k and k, j, respectively, P i and P j are the active power at nodes i and j, respectively, Q i and Q j are the reactive power at nodes i and j, respectively, i and j are nodes, P k is the active power at node k, Q k is the reactive power at node k.

5. The method of claim 1, wherein, the determination of the position of the communication interruption node and the node with normal communication closest to the position of the interruption node based on the communication information of each node comprises: determining the node with a node voltage value of 0 as the communication interruption node based on the communication information of each node; finding the node with normal communication closest to the interruption node based on the interruption node.

6. The method of claim 1, wherein, the calculation of the voltage amplitude of the interruption node based on the multi-dimensional information comprises: calculating the voltage amplitude of the interruption node by using power flow based on the multi-dimensional information; wherein the multi-dimensional information comprises voltage, power and voltage amplitude.

7. A system for implementing the method of active distribution network voltage control to mitigate the effects of communication interruptions as claimed in any one of claims 1 to 6, characterised in that, The application comprises the following steps: a positioning module for determining the position of the communication interruption node and the node with normal communication closest to the position of the interruption node based on the communication information of each node; a collection and calculation module for collecting multi-dimensional information of the active power distribution network and calculating the voltage amplitude of the interruption node based on the multi-dimensional information; a positioning module for determining the position of the communication interruption node and the node with normal communication closest to the position of the interruption node based on the communication information of each node; A reactive power calculation module is configured to bring a pre-constructed multi-node Q-V droop control model based on the multi-dimensional information and the voltage amplitude of the interrupted node, so as to obtain the reactive power required to compensate for each voltage out-of-limit node; A distribution module is configured to distribute the reactive power required to compensate for each voltage out-of-limit node to the normal communication node with voltage regulation capability. The multi-node Q-V droop control model is constructed based on the principle that the main grid power source remains unchanged and ignores the change amount of line power loss between nodes.

8. The system of claim 7, wherein, The distribution module comprises: A judgment sub-module is configured to judge whether the voltage out-of-limit node has voltage regulation capability; A task distribution sub-module is configured to distribute the reactive power required to compensate for the voltage out-of-limit node to the voltage out-of-limit node when the voltage out-of-limit node has voltage regulation capability, and to use a load shifting algorithm to shift the reactive power required to compensate for the voltage out-of-limit node to the nearest normal communication node with voltage regulation capability when the voltage out-of-limit node does not have voltage regulation capability.

9. The system of claim 7, wherein, The positioning module comprises: A judgment sub-module is configured to judge the node with a node voltage value of 0 as an interrupted communication node based on the communication information of each node; A finding sub-module is configured to find the nearest normal communication node to the interrupted node based on the interrupted node.

10. A computer device, characterized by It comprises: One or more processors; A processor is configured to execute one or more programs; When the one or more programs are executed by the one or more processors, the one or more programs implement the active power distribution network voltage control method for suppressing the impact of communication interruption according to any one of claims 1-6.

11. A computer readable storage medium, characterized in that, The computer program is stored thereon and is executed to implement the active power distribution network voltage control method for suppressing the impact of communication interruption according to any one of claims 1-6.

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