A power distribution network shared power loop closing system, control method, device and medium

Abstract

The application relates to the field of power systems, in particular to a power distribution network shared power loop system, a control method, equipment and a medium. The application comprises at least two feeders, each of the feeders is connected with at least one load and at least one power supply; each of the feeders leads out a common connection point and is connected with other adjacent feeders through a feeder tie switch; and the common connection point of each of the feeders is connected with an energy storage unit through a DC / AC power converter. Through the use of the DC / AC converter and the shared energy storage unit, the application can realize more flexible energy scheduling and support between different feeders of the power distribution network, and solves the problem that the power flow regulation and control capability of the power distribution network is limited when the distributed new energy and the load are intensively accessed.

Description

Technical Field

[0001] This invention relates to the field of power systems, specifically to a shared power loop system for distribution networks, a control method, equipment, and medium. Background Technology

[0002] With the increasing integration of intermittent renewable energy sources such as photovoltaics and wind power into distribution networks, and the widespread application of diverse loads such as electric vehicles, the reliability of distribution networks faces new challenges. Conventional distribution networks adopt a "closed-loop structure, open-loop operation" strategy. Multiple feeders in the distribution network lack long-term interconnection channels, severely limiting the power flow regulation capability under open-loop operation, making it difficult to adapt to the dense integration of distributed renewable energy sources and loads. Furthermore, traditional mechanical loop-closing devices are time-consuming to operate, experience large instantaneous transient current surges, and have stringent requirements for loop-closing point selection, making them unsuitable for prolonged loop-closing operation.

[0003] To address the aforementioned issues, some literature has proposed flexible closed-loop multi-state switches based on power electronic devices. However, their fault and disturbance recovery capabilities are limited, and the cost of large-capacity power electronic devices is relatively high. Furthermore, long-term closed-loop operation poses new challenges to the operating life of active and passive components in power electronic devices.

[0004] Therefore, how to design the structure of the distribution network loop-closing device and make reasonable use of power electronic devices are key technical issues that urgently need to be solved in the development of distribution network control. Summary of the Invention

[0005] The purpose of this invention is to provide a power distribution network shared loop system, control method, equipment and medium to solve the problem of limited power flow regulation capability of the distribution network when distributed new energy sources and dense load access are present in the prior art.

[0006] To achieve the above objectives, the following technical solution is adopted.

[0007] A power distribution network shared loop system, comprising:

[0008] There are at least two feeders, each of which is connected to at least one load and at least one power source;

[0009] Each of the feeders leads out a common connection point and is connected to other adjacent feeders via a feeder interconnection switch;

[0010] The common connection point of each feeder is connected to the energy storage unit via a DC / AC power converter.

[0011] Optional features include four feeders and one energy storage unit.

[0012] Optionally, a control unit is further included for sending control signals to the DC / AC converter to regulate the power flow among the feeders.

[0013] The control unit includes:

[0014] a power calculation module for calculating the rated active power capacity and the reactive power surplus capacity of each feeder;

[0015] a sensitivity analysis module for performing sensitivity analysis of voltage and phase angle at the common connection points in the feeders;

[0016] a decision module for determining the feeder providing energy support according to the power calculation and sensitivity analysis results.

[0017] A power sharing loop closing control method for a power distribution network, based on a power sharing loop closing system for a power distribution network, comprising the steps of,

[0018] calculating the rated active power capacity and the reactive power surplus capacity of each feeder by a power calculation module to obtain power calculation results;

[0019] performing sensitivity analysis of voltage and phase angle at the common connection points in the feeders by a sensitivity analysis module to obtain sensitivity analysis results;

[0020] determining the feeder providing energy support according to the power calculation results and sensitivity analysis results by a decision module, and sending adjustment instructions to control the DC / AC power converter;

[0021] adjusting the output of the DC / AC power converter according to the adjustment instructions of the decision module to compensate for the voltage and phase angle differences among the feeders;

[0022] operating the feeder tie switch to connect multiple feeders to enable energy mutual aid.

[0023] Optionally, the step of calculating the rated active power capacity and the reactive power surplus capacity of each feeder by the power calculation module comprises:

[0024] S1.1, collecting line parameters and load demand data of each feeder;

[0025] S1.2, calculating the rated active power capacity of each feeder using the collected data;

[0026] S1.3, calculating the reactive power surplus capacity of each feeder using the collected data;

[0027] S1.4, determining the real-time load state of each feeder.

[0028] Optionally, the step of performing sensitivity analysis of voltage and phase angle at the common connection points in the feeders by the sensitivity analysis module comprises:

[0029] S2.1, real-time monitoring of voltage and phase angle data of the common connection point of each feeder;

[0030] S2.2, sensitivity analysis of voltage and phase angle based on monitoring data;

[0031] S2.3, calculating the sensitivity of the voltage effective value of the common connection point of the feeder to active power, and calculating the sensitivity of the power angle of the feeder to active power;

[0032] S2.4, calculating the sensitivity of the voltage effective value of the common connection point of the feeder to reactive power, and calculating the sensitivity of the power angle of the feeder to reactive power.

[0033] Optionally, the step of determining the feeder providing energy support according to the power calculation and sensitivity analysis results by the decision module comprises:

[0034] S3.1, identifying the overloaded feeder according to the real-time load state determined in S1.4;

[0035] S3.2, evaluating the ability of each feeder to provide energy support to the overloaded feeder using the sensitivity analysis results;

[0036] S3.3, selecting the most suitable feeder for energy support based on the evaluation results;

[0037] S3.4, generating energy support instructions.

[0038] Optionally, the step of adjusting the output of the DC / AC power converter to compensate for the voltage and phase angle difference between the feeders according to the instructions of the decision module comprises:

[0039] S4.1, receiving the energy support instructions generated in step S3.4;

[0040] S4.2, adjusting the active power and reactive power output of the DC / AC converter according to the energy support instructions;

[0041] S4.3, compensating the voltage and phase angle of the common connection point of the feeder by the DC / AC converter;

[0042] S4.4, ensuring that the voltage amplitude and phase angle difference after compensation is within the preset safety range, and maintaining the power flow balance between the feeders.

[0043] An electronic device comprising a processor and a memory, the processor being configured to execute a computer program stored in the memory to implement the power sharing closed-loop control method of the power distribution network.

[0044] A computer-readable storage medium stores at least one instruction, which is executed by a processor to implement the power sharing loop closing control method of a power distribution network.

[0045] Compared with the prior art, the present application has the following beneficial effects:

[0046] 1、The present application can achieve more flexible energy scheduling and support between different feeders of a power distribution network by using DC / AC converters and shared energy storage units, solving the problem of limited power flow regulation capability of the power distribution network when distributed new energy and heavy loads are connected.

[0047] 2、The present application can effectively reduce voltage and phase angle differences during loop closing operation by precisely controlling the output of the DC / AC converter, thereby enhancing the stability of the system.

[0048] 3、Compared with traditional mechanical loop closing operation, the control method of the present application reduces operation time and transient current impact, and improves operation efficiency.

[0049] 4、The present application supports high proportion of distributed new energy access, optimizes the utilization efficiency of new energy, and promotes the development of clean energy. Through real-time monitoring and analysis of the power state of the feeder, the present application can more effectively manage multi-element load and improve the response capability of the power distribution network to load changes. In the event of a fault, the present application can quickly identify the overloaded feeder and quickly provide energy support, shorten the recovery time, and enhance the self-healing capability of the system.

[0050] 5、The present application reduces the dependence on large-capacity power electronic devices by optimizing the structure and control method of the loop closing device, reduces the system cost, and prolongs the service life of the power electronic converter and the energy storage unit. The control method of the present application can provide more reliable loop closing device access position selection under various fault scenarios through multi-index evaluation and decision fusion, and improve the power supply reliability of the power distribution network. BRIEF DESCRIPTION OF DRAWINGS

[0051] Figure 1 The figure is a structural schematic diagram of an embodiment of a power distribution network shared power loop closing system of the present application.

[0052] Figure 2 The figure is a flowchart of an embodiment of a power distribution network shared power loop closing method of the present application.

[0053] Figure 3 The figure is a point of common coupling voltage vector diagram of an embodiment of a power distribution network shared power loop closing system of the present application.

[0054] Figure 4A block diagram of an embodiment of a power sharing loop closing device for a power distribution network. DETAILED DESCRIPTION

[0055] The application will be described in detail below with reference to the drawings and embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0056] The following detailed description is exemplary and is intended to provide further details of the application. Unless otherwise defined, all technical terms used in the present application have the same meanings as generally understood by those skilled in the art to which the present application belongs. The terms used in the present application are only for the purpose of describing the specific embodiments and are not intended to limit the exemplary embodiments according to the present application.

[0057] In the normal operating state, the DC / AC converter does not work, and the feeder tie switch is in the open state. The power required by the load of each feeder is supplied by the power generated by the respective generator or photovoltaic power station.

[0058] When any load is overloaded (the load is too large), the local generator and photovoltaic power station cannot meet the load demand. The traditional operation is to close the loop tie switch to obtain energy from other feeders. However, at this time, there may be a large difference in voltage amplitude, frequency and phase angle between the two lines. Hard closing the feeder tie switch will cause the tie switch to bear a large current, which is easy to damage the feeder tie switch and further cause the closing failure.

[0059] In order to prevent the above problems, the present application determines which feeder to provide power support according to the capacity between the feeders, and compensates the feeder common connection point through the energy storage unit connected to the DC / AC converter. The difference between the voltage, frequency and phase of the two feeder common connection points is as small as possible, the large current in the loop closing process of the feeder tie switch is eliminated, and the system stability is enhanced. When the feeder tie switch is closed, the DC / AC converter can stop working, and the service life of the power electronic converter and the energy storage unit is enhanced.

[0060] Embodiment 1,

[0061] As shown in Figure 1 A power sharing loop closing system for a power distribution network, comprising:

[0062] At least two feeders, each of which is connected with at least one load and at least one power supply;

[0063] Each of the feeders leads to a common connection point, and is connected with other adjacent feeders through a feeder tie switch;

[0064] The common connection point of each of the feeders is connected with an energy storage unit through a DC / AC power converter;

[0065] As a preferred example, it includes 4 feeders and one energy storage unit.

[0066] Specifically, as shown in Figure 1 The power distribution grid system includes 4 feeders, each of which contains loads with different power, and some of which contain photovoltaic power stations. Each feeder leads to a common connection point, which is connected to other adjacent feeders through feeder tie switches. At the same time, the common connection point of each feeder is connected to the energy storage unit through a DC / AC power converter, and the 4 feeders share one energy storage unit.

[0067] As a preferred example, it also includes a control unit for sending control signals to the DC / AC converter to adjust the power flow between the feeders.

[0068] The control unit includes:

[0069] A power calculation module for calculating the rated active power capacity and reactive power surplus capacity of each feeder.

[0070] A sensitivity analysis module for performing voltage and phase angle sensitivity analysis on the common connection point in the feeder.

[0071] A decision module for determining the feeder providing energy support based on the power calculation and sensitivity analysis results.

[0072] Embodiment 2

[0073] As shown in Figure 2 A power distribution grid shared power closed-loop control method, comprising the following steps,

[0074] The rated active power capacity and reactive power surplus capacity of each feeder are calculated by the power calculation module.

[0075] Specifically, it includes the following steps:

[0076] S1.1, collect line parameters and load demand data of each feeder;

[0077] Specifically, it is assumed that the line impedance of each feeder does not change with time, and the resistance and reactance of each feeder are represented by Ri and Xi, respectively, (i=1, 2, 3…n, feeder number).

[0078] The power converter transformer capacity between each feeder and the energy storage unit is Hi.

[0079] S1.2, calculate the rated active power capacity of each feeder using the collected data;

[0080] S1.3, calculate the reactive power surplus capacity of each feeder using the collected data;

[0081] Specifically, the rated active power capacity S pi , reactive power surplus capacity S qi , active power surplus capacity C pi , reactive power surplus capacity C qi , active power surplus capacity percentage D pi and reactive power surplus capacity percentage D qi

[0082]

[0083] S1.4, determine the real-time load state of each feeder.

[0084] The sensitivity analysis module is used to analyze the sensitivity of voltage and phase angle of the common connection point in the feeder;

[0085] Specifically, the following steps are included:

[0086] S2.1, real-time monitoring of voltage and phase angle data of the common connection point of each feeder;

[0087] Specifically, the voltage phase angle θ i of the common connection point of each feeder is calculated as:

[0088]

[0089] S2.2, based on the monitoring data, sensitivity analysis of voltage and phase angle is performed;

[0090] S2.3, calculate the sensitivity of the voltage effective value of the common connection point of the feeder to the active power, and calculate the sensitivity of the power angle of the feeder to the active power;

[0091] Specifically, the voltage effective value U i of the common connection point of each feeder is calculated as: i

[0092]

[0093] The active power P i of the feeder and the voltage effective value U i are expressed in relative quantities, and the relative sensitivity of the voltage to the active power is:

[0094]

[0095] The power angle θ i of each feeder is calculated as: i

[0096] ​​

[0097] The active power of the feeder is denoted as P i The relative sensitivity of the corresponding feeder power angle to the active power is:

[0098]

[0099] S2.4, calculate the sensitivity of the voltage effective value of the feeder point of common connection to the reactive power, and calculate the sensitivity of the feeder power angle to the reactive power;

[0100] The voltage effective value U i of the point of common connection of each feeder is calculated: i The sensitivity of the reactive power Q i of each feeder to the voltage effective value U i is calculated:

[0101]

[0102] The reactive power Q i of the feeder and the voltage effective value U i are expressed in relative quantities, and the relative sensitivity of the corresponding feeder voltage to the reactive power is:

[0103]

[0104] The power angle θ i of each feeder is calculated: i The sensitivity of the reactive power Q i of each feeder to the power angle θ i is calculated:

[0105]

[0106] The reactive power Q i of the feeder is denoted as: i The relative sensitivity of the corresponding feeder power angle to the active power is:

[0107]

[0108] The feeder providing energy support is determined by the decision module according to the power calculation and sensitivity analysis results;

[0109] Specifically, according to the capacity, residual capacity, residual capacity percentage, sensitivity and relative sensitivity of each feeder, it is determined which feeder provides energy to the heavy load feeder.

[0110] Specifically, the following steps are included:

[0111] S3.1, according to the real-time load state determined in S1.4, identify the heavy load feeder;

[0112] Set the heavy load active power threshold percentage B pi and the heavy load reactive power threshold percentage B qi of each feeder;

[0113] If the feeder L m has a percentage of active load surplus capacity D pm less than (1-B pm ), or a percentage of reactive load surplus capacity D qm less than (1-B qm ), it means that this feeder is in heavy load operation, and needs power support from other feeders; (m∈i).

[0114] S3.2, using the sensitivity analysis results, evaluate the ability of each feeder to provide energy support for the heavy load feeder;

[0115] According to the circuit network connection, determine which feeder L t≠m has a feeder tie switch with the heavy load feeder g2;

[0116] Calculate the surplus capacity C t≠m and the percentage of surplus capacity D (p,q),t≠m of L (p,q),t≠m , measure the voltage and phase angle, and calculate the relevant sensitivity and relative sensitivity through formula (3) - formula (10).

[0117] S3.3, based on the evaluation results, select the most suitable feeder for energy support;

[0118] Because the effective value of the voltage phasor at the point of common coupling is greatly affected by reactive power and less affected by active power, while the phase angle of the voltage is greatly affected by active power and less affected by reactive power. Therefore, when L m needs active power support, the feeder with larger C p,t≠m and D p,t≠m is preferred to output active power to L m for active power compensation. Similarly, therefore, when L m needs reactive power support, the feeder with larger C q,t≠m and D q,t≠m is preferred to output active power to L m for reactive power compensation;

[0119] S3.4, generate energy support instructions.

[0120] The DC / AC power converter adjusts the output according to the instructions of the decision module to compensate for the voltage and phase angle difference between the feeders;

[0121] Specifically, in order to ensure the reliable closing of the feeder tie switch and the power support between the feeders, according to the feeder information, the sensitivity and the relative sensitivity information obtained in steps g4 and g5, the energy storage unit can compensate the voltage phasor effective value and the phase angle at the point of common coupling by controlling the active power and the reactive power of the power converter, so that the voltage phasor effective value and the phase angle on both sides of the tie switch are consistent.

[0122] Specifically, the method comprises the following steps:

[0123] S4.1, receiving the energy support instruction generated in step S3.4;

[0124] S4.2, adjusting the active power and the reactive power output of the DC / AC converter according to the energy support instruction;

[0125] S4.3, compensating the voltage and the phase angle at the point of common coupling of the feeder by the DC / AC converter;

[0126] S4.4, ensuring that the difference between the compensated voltage amplitude and the phase angle is within a preset safe range, and maintaining the power flow balance between the feeders.

[0127] Specifically, the relative change rate of the voltage amplitude and the power angle of the point of common coupling of the feeder can be expressed by formula (11) and formula (12):

[0128] ΔU ipq = R Uip ΔP + R Uiq ΔQ (11)

[0129] Δθ ipq = R θip ΔP + R θiq ΔQ (12)

[0130] Here, ΔU ipq is the relative change rate of the voltage amplitude at the point of common connection, Δθ ipq is the relative change rate of the phase angle at the point of common connection, ΔP is the relative adjustment amount of the active power at the point of common connection, and ΔQ is the relative adjustment amount of the reactive power at the point of common connection.

[0131] When the feeder L m needs power support, the energy storage unit can control the active and reactive power of the power converter connected to the feeders L m and L t≠m respectively, and ensure that the feeders L m and L t≠mThe voltage amplitude and phase angle of the two common connection points tend to be consistent. Meanwhile, the feeder with the common connection point with relatively high sensitivity is preferentially selected for control, so that smaller power can be used to realize larger amplitude control of the voltage and phase of the common connection point, and the utilization of the energy storage resource is facilitated.

[0132] The feeder tie switches are operated to connect multiple feeders, so that energy mutual aid is enabled.

[0133] Specifically, the method comprises the following steps:

[0134] S5.1, checking the state of the feeder tie switch after compensation is completed;

[0135] S5.2, confirming that the feeder tie switch is in a disconnected state;

[0136] S5.3, sending a closing instruction to the mechanical feeder tie switch after confirming that the voltage and phase angle difference meets the loop closing condition;

[0137] S5.4, closing the mechanical feeder tie switch to realize energy mutual aid between the two feeders;

[0138] S5.5, continuously monitoring the power flow between the feeders and the system stability after the mechanical feeder tie switch is closed, and adjusting the output of the DC / AC converter if necessary.

[0139] Specifically, the tie switch between the common connection points of the feeders L m and L t≠m is closed, and because the voltage and phase angle at the two common connection points are consistent in the h step, the tie switch will not generate a large impact current when it is closed.

[0140] When the tie switch is effectively closed, the power converter can be notified to exit compensation, and energy mutual aid between the two feeders is realized.

[0141] The energy of the energy storage unit can be supplemented at any time by controlling the power converter to charge from the lightly loaded feeder.

[0142] The present application is dedicated to overcoming the problems of the traditional power distribution network, i.e., multiple feeders lack long-term interconnection channels, distributed new energy and loads are difficult to access and centrally dispatch, and the operation time of the traditional loop closing device is long and the transient current impact is large. The present application combines a mechanical loop closing switch, a power converter and a shared energy storage unit, considers the fast response of the power electronic power converter and the large current bearing of the mechanical loop closing switch, and provides the advantages of the shared energy storage device in terms of voltage sensitivity, power sensitivity and voltage phase angle difference. Information is integrated to propose a coordinated control of a multi-feeder loop closing structure of a power distribution network, so as to realize energy balance and emergency mutual aid between multiple feeders.

[0143] Significantly increase the distributed new energy and load access of distribution network, slow down the expansion and reconstruction of distribution line for power enterprises, and effectively improve the utilization efficiency of the existing distribution network structure closing device. At the same time, it can improve the power supply reliability and safety of distribution network.

[0144] Embodiment 3

[0145] As shown in Figure 1 and Figure 3 , the electrical structure of the distribution network composed of four feeders is shown in step 1 of the technical solution. Assuming that the load required power on 1# feeder is large, and the generator and photovoltaic power station are heavy load operation, at this time the remaining capacity of 1# feeder is not enough, and energy needs to be obtained from other feeders. According to the connection structure of the distribution network, there is a tie switch between 1# feeder and 2# and 3# feeders, which can obtain energy from 2# and 3# feeders. At this time, the load conditions of 2# and 3# feeders are detected, and the voltage and phase angle conditions of 1#, 2# and 3# common connection points are combined, as shown in Figure 2 . Among them, U1, U2 and U3 are voltage vectors of 1#, 2# and 3# common connection points, respectively, E 12 = U1 - U2, E 23 = U2 - U3 are the voltage vector differences of the common connection points, and θ 12 and θ 23 are the phase differences between the voltages of 2# and 3# common connection points and 1# common connection point.

[0146] According to the impedance and power information in each feeder, the related sensitivity of each feeder line is obtained according to formulas (3)-(10), the feeder with the largest sensitivity is selected, and the corresponding power converter is controlled through the common energy storage unit to realize the compensation of power angle, as shown in Figure 2 . According to the remaining capacity of 2# or 3# feeder, the power converter can be controlled, so that θ 12 ≈ 0, |U2| ≈ |U1| of 2# feeder common connection point voltage amplitude, |U3| ≈ |U1| of 3# feeder common connection point voltage amplitude, close the tie switch of 1# and 2# feeders, and make 2# feeder provide energy to 1# feeder as support. When the tie switch is stably closed, the power converter can be disconnected and exit control! Similarly, 3# feeder can also support 1# feeder according to its own remaining capacity.

[0147] Embodiment 4

[0148] As shown in Figure 4 , an electronic device includes a processor and a memory, the processor is used to execute the computer program stored in the memory to realize a kind of distribution network sharing power closing control method.

[0149] The application further provides an electronic device 100 for implementing the power sharing loop closing control method of the power distribution network.

[0150] Embodiment 5

[0151] A computer readable storage medium stores at least one instruction, and the at least one instruction is executed by a processor to implement the power sharing loop closing control method of the power distribution network.

[0152] The modules / units integrated in the electronic device 100, if implemented in the form of software function units and sold or used as independent products, can be stored in a computer readable storage medium. Based on such understanding, all or part of the processes in the above-mentioned embodiment methods can also be completed by a computer program instructing related hardware, and the computer program can be stored in a computer readable storage medium. When the computer program is executed by a processor, the steps of each method embodiment described above can be implemented. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or some intermediate forms. The computer readable medium can include any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, and read-only memory (ROM). Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can be in the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can be in the form of a computer program product implemented on one or more computer readable storage media (including but not limited to disk memory, CD-ROM, optical memory, etc.) containing computer usable program code. The present application is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to produce a machine, so that the instructions executed by the computer or other programmable data processing devices produce a device that implements the functions specified in the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 one or more flows and / or blocks Figure 1 one or more flows and / or blocks Figure 1 one or more flows and / or blocks Figure 1 one or more flows and / or blocksFigure 1 the steps of the functions specified in the one or more blocks.

[0153] It is apparent that the present application can be carried out in various embodiments without departing from the spirit or essential characteristics thereof. Thus, the above disclosure is intended to be illustrative only and not restrictive. All changes that come within the meaning and range of equivalency of the present application are to be embraced within the scope thereof. Changes in, or substitutions of, equivalents of, parts and arrangements are considered to be already known, accepted, or routine changes by those with skill in the art to which the application pertains.

Claims

1. A power sharing closed loop system for a power distribution network, characterized by, The system comprises: 4 feeders and a storage unit, each feeder is connected with at least one load and at least one power supply; Each feeder leads to a common connection point, and is connected with other adjacent feeders through feeder tie switches; The common connection point of each feeder is connected with the storage unit through a DC / AC power converter; the storage unit compensates the voltage phasor effective value and phase angle at the common connection point by controlling the active power and reactive power of the power converter, so that the voltage phasor effective value and phase angle on both sides of the tie switch are consistent; The system further comprises a control unit for sending control signals to the DC / AC converter to adjust the power flow among the feeders; The control unit comprises: a power calculation module for obtaining power calculation results based on the rated active power, rated reactive power, active power remaining capacity and reactive power remaining capacity of each feeder; a sensitivity analysis module for performing sensitivity analysis on the voltage and phase angle of the common connection point in the feeder to obtain sensitivity analysis results; a decision module for determining the feeder providing energy support according to the power calculation results and the sensitivity analysis results.

2. A method for sharing power closed-loop control of a power distribution network, characterized in that, The system of claim 1, comprising the following steps: obtaining power calculation results based on the rated active power, rated reactive power, active power remaining capacity and reactive power remaining capacity of each feeder by the power calculation module; performing sensitivity analysis on the voltage and phase angle of the common connection point in the feeder by the sensitivity analysis module to obtain sensitivity analysis results; determining the feeder providing energy support according to the power calculation results and the sensitivity analysis results by the decision module, and sending adjustment instructions to the control DC / AC power converter; adjusting the output of the control DC / AC power converter according to the adjustment instructions of the decision module to compensate for the voltage and phase angle difference among the feeders; connecting multiple feeders by operating the feeder tie switch to enable energy mutual aid.

3. The method of claim 2, wherein the method further comprises: The step of obtaining power calculation results based on the rated active power, rated reactive power, active power remaining capacity and reactive power remaining capacity of each feeder by the power calculation module comprises: S1.1, collecting line parameters and load demand data of each feeder; S1.2, obtaining the rated active power and rated reactive power of each feeder using the collected data; S1.3, calculating the active power remaining capacity and reactive power remaining capacity of each feeder using the collected data; S1.4, determining the real-time load state of each feeder according to the rated active power, rated reactive power, active power remaining capacity and reactive power remaining capacity of each feeder.

4. The method of claim 2, wherein the method further comprises: The step of performing sensitivity analysis on the voltage and phase angle of the common connection point in the feeder by the sensitivity analysis module comprises: S2.1, performing real-time monitoring of voltage and phase angle data at the common connection point of each feeder to obtain detection data; S2.2, performing sensitivity analysis on the voltage and phase angle based on the monitoring data to obtain sensitivity analysis data; S2.3, calculating the sensitivity of the voltage effective value of the common connection point of the feeder to the active power, and calculating the sensitivity of the power angle of the feeder to the active power according to the obtained sensitivity analysis data; S2.4, according to the obtained sensitivity analysis data, calculating the sensitivity of the voltage effective value of the feeder point of common coupling to the reactive power, and calculating the sensitivity of the feeder power angle to the reactive power.

5. The method of claim 3, wherein the method further comprises: The step of determining the feeder providing energy support according to the power calculation and the sensitivity analysis result by the decision module comprises: S3.1, according to the real-time load state determined in S1.4, identifying the heavy load feeder; S3.2, using the obtained sensitivity analysis result, evaluating the ability of each feeder to provide energy support for the heavy load feeder, and obtaining an evaluation result; S3.3, based on the evaluation result, selecting the most suitable feeder for energy support, and generating an energy support instruction.

6. The method of claim 5, wherein the method further comprises: The step of adjusting the output of the DC / AC power converter according to the instruction of the decision module to compensate for the voltage and phase angle difference between the feeders comprises: S4.1, receiving the energy support instruction generated in S3.4; S4.2, adjusting the active power and reactive power output of the DC / AC converter according to the energy support instruction; S4.3, compensating the voltage and phase angle of the feeder point of common coupling by the DC / AC converter; S4.4, ensuring that the voltage amplitude and phase angle difference after compensation is within the preset safety range, and maintaining the power flow balance between the feeders.

7. An electronic device, comprising: The processor is used to execute the computer program stored in the memory to realize the power sharing control method of the power distribution network as claimed in any one of claims 2 to 6.

8. A computer-readable storage medium, characterized in that, The computer readable storage medium stores at least one instruction, and the at least one instruction is executed by the processor to realize the power sharing control method of the power distribution network as claimed in any one of claims 2 to 6.

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