Active power distribution network fault recovery method considering DG power climbing characteristic and SOP over-load shedding capability and active power distribution network comprising intelligent soft switch SOP

Abstract

The invention provides an active power distribution network fault recovery method taking DG power climbing characteristics and SOP over-load shedding capability into consideration and an active power distribution network comprising an intelligent soft switch SOP, and the method comprises the following steps: firstly, determining a control mode of the SOP according to information after fault isolation; immediately, considering the short-time overload capacity of the SOP, and short-time overload of the SOP and supplying power to the fault downstream area. Secondly, considering the power climbing characteristic of the DG and the cooperative load shedding capability of the SOP, specifically, after the DG exits from low voltage ride through, the DG starts to climb power, and meanwhile, the SOP starts to perform cooperative load shedding; and finally, the output power of the DG reaches the output size before the fault, meanwhile, the SOP is recovered to a rated operation state, and fault recovery is ended. On the basis of the SOP-containing active power distribution network, the problem that a DG power climbing characteristic and SOP over-load shedding capability cooperative regulation and control mechanism is not clear in the active power distribution network fault recovery process is solved, and then the active power distribution network fault recovery method considering the DG power climbing characteristic and the SOP over-load shedding capability is provided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power supply recovery of power distribution network, in particular to an active power distribution network fault recovery method considering DG power ramping characteristics and SOP overload capacity and an active power distribution network containing intelligent soft open point SOP. BACKGROUND

[0002] In the face of the urgent situation of global climate governance, China is undergoing a profound transformation in energy consumption structure while achieving high-quality economic development. To cope with the increasingly severe environmental challenges, China will build a new type of power system dominated by renewable energy as the core path to achieve this goal. Under this background, large-scale access and efficient use of distributed generation (DG) by power grid system has become an important technical support for promoting the low-carbon transformation of energy system. In addition, the development of new power electronic devices and DG opens up new paths for fault recovery strategies.

[0003] As a power electronic device installed at the traditional tie switch, the intelligent soft open point (SOP) can flexibly adjust its power flow direction, change the system power distribution, and thus improve the operation state of the entire power distribution system. After fault isolation of the power distribution network, the SOP can provide certain voltage support for the power loss area and enhance the fault recovery capability of the power distribution system, fully demonstrating its flexible and controllable characteristics and voltage support effect. Compared with the traditional tie switch, the power control of the SOP is more secure and reliable, effectively avoiding the safety hazards that may be caused by frequent operation of the switch. When a fault occurs, the SOP can effectively block the fault current from crossing over by relying on the DC isolation function; during the fault recovery process, it can provide stable voltage support for the fault side and expand the power supply recovery range.

[0004] However, the existing active power distribution network fault recovery method considering the short-time overload capacity of the SOP will be locked after short-time overload, and the existing active power distribution network fault recovery strategy considering the short-time overload of the SOP rarely considers the DG power ramping characteristics. At the same time, there is a lack of research on the coordinated control mechanism of the DG power ramping characteristics and the SOP overload capacity.

[0005] Existing technical problems and thinking: how to solve the problem of unclear coordinated control mechanism of DG power ramping characteristics and SOP overload capacity in the active power distribution network fault recovery process. SUMMARY

[0006] Therefore, the purpose of the present application is to provide an active power distribution network fault recovery method considering DG power ramping characteristics and SOP overload capacity and an active power distribution network containing intelligent soft open point SOP, to solve the problem of unclear coordinated control mechanism of DG power ramping characteristics and SOP overload capacity in the active power distribution network fault recovery process.

[0007] To achieve the above object, the application adopts the following technical solutions: an active power distribution network fault recovery method considering DG power ramping characteristics and SOP overload capacity, comprising the following steps:

[0008] Step (1): After the power distribution network detects the fault and isolates it, the intelligent soft switch SOP determines the control mode according to the power outage situation of the connected area;

[0009] Step (2): Considering the short-time overload capacity of the intelligent soft switch SOP, the intelligent soft switch SOP determines the control mode and runs for a short time, supplying power to the downstream area of the fault;

[0010] Step (3): Considering the power ramping characteristics of the distributed power source DG, the distributed power source DG starts power ramping after exiting low voltage ride through, and the intelligent soft switch SOP starts to reduce load according to the power ramping speed and rated capacity of the distributed power source DG, adjusting the recovery strategy;

[0011] Step (4): The distributed power source DG restores the output power to the size before the fault, and the intelligent soft switch SOP reduces the load to the rated operating state, and the multi-period fault recovery result of the active power distribution network containing the intelligent soft switch SOP is determined.

[0012] In a preferred embodiment: the control mode of the intelligent soft switch SOP used in step (1) is used to determine the control mode of the two converters of the intelligent soft switch SOP under normal operation and fault conditions of the power distribution network, and when the fault occurs, the control mode of the converter connected to the non-fault power outage area is Vf control, which supports the load voltage and ensures continuous power supply in the non-fault power outage area, while the control mode of the other converter is switched to U dc Q, responsible for stabilizing the DC voltage.

[0013] In a preferred embodiment: in step (2), the intelligent soft switch SOP reserves short-time overload capacity in the design stage when designing the power distribution network fault recovery and load transfer scheme, which is used to quickly dispatch main grid power to support power supply recovery in the power outage area after the fault occurs, and a mathematical constraint of the intelligent soft switch SOP capacity considering short-time overload is established:

[0014]

[0015]

[0016] In the formula: and are the rated capacities of the converters at nodes i and j, respectively; are the active power and reactive power output by the converter at node i and j at time t during the short-time overload process, respectively. is the ratio of overload power to rated capacity.

[0017] In a preferred embodiment, the distributed generation power ramping characteristic in step (3) is used to incorporate the distributed generation power ramping process into the fault recovery method, after the distributed generation exits low voltage ride through, the distributed generation output starts to ramp up at a certain rate, fast recovery of non-fault area power failure, the distributed generation power ramping process is defined as:

[0018]

[0019] wherein: is the time when the distributed generation starts power ramping, is the time when the distributed generation output power recovers to the pre-fault state, the distributed generation power ramping ends, ; is the active power injected into the power grid by the distributed generation at node n at time ; is the active power injected into the power grid by the distributed generation at node n at time ; is the distributed generation power ramping rate during the distributed generation ramping period, .

[0020] In a preferred embodiment, the intelligent soft switch SOP load shedding capability in step (3) is used to incorporate the intelligent soft switch SOP load shedding process into the fault recovery method, to avoid further expansion of the fault range caused by long-term short overload of the intelligent soft switch SOP during the distribution network recovery process, the intelligent soft switch SOP load shedding process is defined as:

[0021]

[0022]

[0023] wherein, , are the active power injected into the power grid by the intelligent soft switch SOP at node i and j at time ; , are the active power injected into the power grid by the intelligent soft switch SOP at node i and j at time , is the intelligent soft switch SOP load shedding rate, .

[0024] In a preferred embodiment, the power distribution network fault recovery method considering the distributed power source DG power ramping characteristics and the smart soft switch SOP overload reduction capability in step (3) is used to confirm the reduction rate of the smart soft switch SOP before the smart soft switch SOP and the distributed power source DG restore the rated output, and the smart soft switch SOP adjusts the recovery scheme according to the power ramping degree and the rated power of the distributed power source DG. For:

[0025]

[0026] In the formula, , is the ratio of overload power to rated capacity, is the power ramping rate of the distributed power source DG during the power ramping of the distributed power source DG.

[0027] In a preferred embodiment, the distributed power source DG and the smart soft switch SOP are restored to the rated capacity at the same time in step (4), and the power distribution network fault recovery result considering the distributed power source DG power ramping characteristics and the smart soft switch SOP overload reduction capability is determined to determine the power distribution network fault recovery scheme.

[0028] The application also provides an active power distribution network with a smart soft switch SOP, which includes a multi-period fault recovery method of the active power distribution network with a smart soft switch SOP, and the active power distribution network fault multi-period recovery method is provided with the active power distribution network fault recovery method considering the DG power ramping characteristics and the SOP overload reduction capability.

[0029] Compared with the prior art, the application has the following beneficial effects: the application considers the DG power ramping characteristics and the SOP overload reduction capability, solves the problem that the cooperative control mechanism of the DG power ramping characteristics and the SOP overload reduction capability is not clear during the active power distribution network fault recovery process, and at the same time, the method considers the DG power ramping characteristics and the SOP short-time overload during the active power distribution network fault recovery process, and further proposes an active power distribution network fault recovery method considering the DG power ramping characteristics and the SOP overload reduction capability. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is the topology of the SOP;

[0031] Figure 2 is the active power distribution network structure diagram considering the SOP adaptive overload reduction capability.

[0032] Figure 3 is the low voltage ride through requirement of the photovoltaic power station;

[0033] Figure 4 is the DG active power output curve;

[0034] Figure 5 This is a flowchart of the fault recovery process;

[0035] Figure 6 (a) and (b) show the load restoration results in the non-fault outage area when the DG ramp rate is 30% of rated capacity / s and 40% of rated capacity / s, respectively.

[0036] Figure 7 (a) and (b) show the load restoration results in the non-fault outage area when the DG to SOP capacity ratio is 2 and 1, respectively.

[0037] Figure 8 (a) and (b) show the load recovery results of the SOP operating at rated conditions and in a non-fault outage area without coordinated load shedding, respectively, without considering the DG power ramping characteristics. Figure 9 (a) and (b) represent the load recovery results of the SOP operating at rated conditions and in the non-fault outage area with 1.5 times overload and coordinated load reduction, respectively, considering the DG power ramping characteristics.

[0038] in, Figures 6-9 The dotted line represents the load restored by the distribution network, where the solid line represents the SOP output and the dashed line represents the DG output. Figure 7 and Figure 9 In this context, the power ramp-up rate of DG is 30% of installed capacity / s. . Detailed Implementation

[0039] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0040] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0041] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations according to this application; as used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise; furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0042] Distribution network fault recovery methods considering DG power ramping characteristics and SOP overload capacity, refer to Figures 1-9, first according to the information after fault isolation, the control mode of SOP is determined. Then, considering the short-time overload capacity of SOP, SOP short-time overload and power supply for the downstream area of fault. Secondly, considering the power ramping characteristics of DG and the collaborative load shedding capacity of SOP, specifically, when the DG exits low voltage ride through, the DG starts power ramping, and the SOP starts collaborative load shedding. Finally, the DG output power reaches the pre-fault output size, and the SOP returns to the rated operating state, and the fault recovery ends. In the following, we further elaborate the multi-period fault recovery method of the active distribution network containing SOP:

[0043] The active distribution network fault recovery method considering the power ramping characteristics of DG and the overload capacity of SOP includes the following steps:

[0044] Step (1): After the distribution network detects the fault and isolates it, the SOP determines the control mode according to the power failure situation of the connected area;

[0045] The SOP used in step (1) is shown in Figure 1 , and the active distribution network structure diagram considering the overload capacity of SOP and the part to be recovered are shown in Figure 2 . Under normal operation and fault conditions of the distribution network, the two converters of the SOP will use different control modes. Specifically, when the distribution network is operating normally, one converter is responsible for controlling the transmission power, and the other converter is responsible for maintaining the stability of the DC voltage. When the system fails, the control mode of the fault side converter switches to Vf control to support the load voltage and ensure continuous power supply in the non-fault area, while the other converter is responsible for the stability of the DC voltage. This invention focuses on the VSC on one side of the SOP in the non-power failure area and the other side in the non-fault power failure area. For the power failure area, the SOP acts as a power source and provides power support for the power failure area during the power supply recovery process.

[0046] Step (2): Considering the short-time overload capacity of SOP, SOP determines the control mode and short-time overload operation to supply power to the downstream area of fault;

[0047] In step (2), the distribution network fault recovery and load transfer scheme design considers that the SOP reserves a certain short-time overload capacity during the design stage, which is used to increase the output of the SOP after the fault occurs, to dispatch the main grid power to support the power supply recovery of the power failure area, and to establish the SOP capacity constraint mathematics considering the short-time overload.

[0048] Generally, the SOP reserves a certain short-time overload capacity in the design stage to cope with the load fluctuation and current impact caused by equipment start-up in actual operation. After the failure of the distribution network, especially for important loads, it is necessary to realize fast power supply recovery in a short time to reduce the loss of power failure. Therefore, the short-time overload capacity of the SOP can be fully utilized in the early stage after fault isolation to quickly dispatch main network power to support power supply recovery in the power failure area.

[0049] The capacity constraint of the SOP under short-time overload conditions can be expressed as follows:

[0050]

[0051]

[0052] In the formula: and are the rated capacity of the converter at nodes i and j, respectively; are the active power and reactive power output by the converter at nodes i and j at time t during short-time overload, respectively; is the ratio of overload power to rated capacity, with a maximum of 1.5, is the maximum operating time of 1 minute.

[0053] Step (3): Considering the power ramping characteristics of the DG, the DG starts power ramping after exiting low-voltage ride-through, and the SOP starts load shedding according to the power ramping speed and rated capacity of the DG, and adjusts the recovery strategy;

[0054] When a fault occurs in the distribution network, DGs with good fault ride-through capability can maintain grid-connected operation and provide necessary support to the system, thereby significantly improving the rapidity and recovery capability of the distribution network fault recovery. The current power industry standard in China requires that distributed power sources must be disconnected within 2 seconds when a fault occurs to prevent unplanned islanding. However, with the increasing proportion of DGs in the distribution network, this approach not only limits the voltage support of distributed power sources, but also may exacerbate the imbalance of grid power. Therefore, many countries have gradually increased the requirements for the low-voltage ride-through (LVRT) capability of distributed power sources. The LVRT conditions for DGs such as photovoltaic power are shown in Figure 3 The values of T1 and T2 are 0.625 s and 2 s, respectively. If the grid-connected point voltage drops to the region above the curve in the figure, it can remain grid-connected; if the grid-connected point voltage drops to the region below the curve, the DG is disconnected from the grid.

[0055] In this invention, all distributed generation (DG) systems connected to the distribution network are fault-riding DG systems. Within a specified time, if the voltage meets the requirements, the DG remains connected to the grid. Taking photovoltaic (PV) power as an example, according to the existing Chinese technical standard GB / T19964-2024 for PV power plant connection to the power system, after fault isolation, the DG exits low-voltage ride-through, and its active power output climbs at a rate of not less than 30% of the installed capacity per second. The relationship between the DG's active power and time is obtained at the minimum required rate as follows: Figure 4 As shown, the black curve represents the minimum power recovery requirement. Figure 4 In this study, if the active power of the distributed generation (DG) is above the curve during the recovery process, it recovers normally; conversely, the portion below the curve cannot recover normally. In existing research on distribution network fault recovery, the supporting role of DG is usually only considered after its power has been fully restored. However, this invention incorporates the DG power ramping process into the recovery strategy, utilizing its output during the ramping phase to provide real-time support to the system, thereby enabling the recovery of more lost loads in a short period of time.

[0056] After a distribution network fault occurs, the active power of the distributed generation (DG) drops to a low level. Once the fault is isolated, its active power will gradually recover to its pre-fault output. Based on this power output characteristic, this invention presents a model of the DG fault recovery process to simulate the power output of the DG at a fixed time step:

[0057]

[0058]

[0059] In the formula: The rated capacity of the DG on node n; DG begins power ramp-up. When the DG output power returns to its pre-fault state, the DG power ramp-up ends. ; For the DG on node n Active power constantly injected into the power grid; For the DG on node n The active power injected into the power grid at that time, in this invention ; The DG power ramp rate during DG ramping. .

[0060] In step (2), the SOP is in a short-term overload state. Considering that the SOP cannot operate in an overload state for a long time, in step (3), the SOP is unloaded during the DG power ramp-up process. The unloading method of the SOP can be expressed as:

[0061]

[0062]

[0063] wherein, , are the active power injected into the power grid by the SOP at node i and j at the time t; , are the active power injected into the power grid by the SOP at node i and j at the time t, is the SOP load shedding rate, .

[0064] The power distribution network fault recovery method considering DG power ramping and SOP load shedding capability in step (3) is used to adjust the recovery scheme of the SOP according to the power ramping degree and rated power of the DG, and to confirm the load shedding rate before the SOP and the DG recover the rated output, and the load shedding rate of the SOP is:

[0065]

[0066] wherein, .

[0067] Step (4): the DG output power recovers to the size before the fault, and the SOP is reduced to the rated operating state, and the multi-period fault recovery result of the active power distribution network containing the SOP is determined.

[0068] In step (4), based on the DG and the SOP recovering to the rated capacity, the active power distribution network fault recovery scheme considering the DG power ramping characteristics and the SOP over-load shedding capability is determined, and the power distribution network fault recovery result is determined. During the DG power ramping process, the load is gradually recovered, and the final fault recovery flow chart is as shown in Figure 5 .

[0069] To verify the effectiveness of the method described in the present application, it is assumed that the active power distribution network containing the SOP is as shown in Figure 2 , is a load node, DG1 and DG2 are DGs connected in the power distribution network, and a fault is set at the bus outlet , and all the loads in the non-fault outage area after the fault can be completely recovered by the DGs and the SOP in the non-fault outage area.

[0070] According to the provisions of GB / T19964-2024, after the fault is isolated, the DG power ramping power is set to 30% rated capacity / s, 40% rated capacity / s, the initial output active power after the SOP control mode is switched is set to 1.5 times the rated capacity, and is coordinated with the DG power ramping rate to reduce load, and the load recovery results of the non-fault outage area obtained are as shown in​​Figure 6 (a), (b) show that the proposed method is suitable for different DG power ramp rates;

[0071] When the DG power ramp rate is 30% rated capacity / s, the initial active power output is 1.5 times the rated capacity after the SOP control mode is determined, and the load shedding is coordinated with the DG power ramp rate, the DG and SOP rated capacity ratio is set respectively and At this time, the load recovery results of the non-fault outage area are shown in Figure 7 (a), (b) show that the proposed method is suitable for different DG and SOP rated power ratios; Figure 7 (a) and Figure 7 (b) show that the proposed method is suitable for different DG and SOP rated power ratios;

[0072] Without considering the DG power ramp characteristics and , the load recovery results of the non-fault outage area obtained by the SOP rated power operation and the 1.5 times overload operation without coordinated load shedding are shown in Figure 8 (a), (b) show that compared with the rated power operation after the SOP confirmation control mode, more downstream load under fault can be recovered under the 1.5 times overload without coordinated load shedding;

[0073] When the DG power ramp rate is 30% rated capacity / s and , the load recovery results of the non-fault outage area obtained by the SOP rated power operation and the 1.5 times overload operation without coordinated load shedding are shown in Figure 9 (a), (b) show that the proposed method can recover more downstream load under fault in each time period.

[0074] Table 1 shows the power recovery amount of each time period after the DG exits low voltage ride through under different strategies , and the table shows that compared with the other three fault recovery schemes, the active power distribution network fault recovery method considering the DG power ramp characteristics and the SOP overload and load shedding capacity proposed in the application can recover more load faster in the fault recovery process.

[0075] Table Comparison of fault recovery schemes

[0076]

[0077] The application provides a kind of active power distribution network fault recovery method considering DG power ramping characteristic and SOP over-load capacity, first, according to the information after fault isolation, the control mode of SOP is determined. Then, considering the short-time overload capacity of SOP, SOP short-time overload and power supply for downstream area under fault. Secondly, considering the power ramping characteristic of DG and the cooperative load shedding capacity of SOP, specifically, when DG exits low voltage ride through, DG starts power ramping, and SOP starts cooperative load shedding. Finally, the output power of DG reaches the size before fault, and SOP returns to rated operation state, and the fault recovery ends. The application is based on active power distribution network containing SOP, solves the problem that cooperative control mechanism of DG power ramping characteristic and SOP over-load capacity is not clear during active power distribution network fault recovery process, and further provides a kind of active power distribution network fault recovery method considering DG power ramping characteristic and SOP over-load capacity.

[0078] The basic principles, main features and advantages of the application are shown and described above. Those skilled in the art should understand that the application is not limited by the above examples, and the above examples and descriptions in the specification are only the principles of the application. Without departing from the spirit and scope of the application, various changes and improvements can be made to the application, and these changes and improvements all fall within the scope of the claimed application. The scope of protection required by the application is defined by the appended claims and their equivalents.

Claims

1. An active distribution network fault recovery method considering DG power ramping characteristics and SOP overload capacity, characterized in that, Includes the following steps: Step (1): After the power distribution network detects and isolates the fault, the intelligent soft switch SOP determines the control mode based on the power outage situation in the connected area; Step (2): Considering the short-time overload capability of the intelligent soft switch SOP, the intelligent soft switch SOP will operate under short-time overload after determining the control mode to supply power to the downstream area of ​​the fault. Step (3): Considering the power ramping characteristics of the distributed power source (DG), the DG starts power ramping after exiting low voltage ride-through. At the same time, the intelligent soft switch (SOP) starts to reduce load and adjust the recovery strategy according to the power ramping speed and rated capacity of the distributed power source (DG). Step (4): The output power of the distributed power source (DG) is restored to the output level before the fault, and the intelligent soft switch (SOP) is reduced to the rated operating state. The fault recovery results of the active distribution network including the intelligent soft switch (SOP) are determined for multiple time periods.

2. The active distribution network fault recovery method considering DG power ramping characteristics and SOP overload capacity as described in claim 1, characterized in that: The control mode of the intelligent soft switch SOP used in step (1) is used to determine the control mode of the two converters of the intelligent soft switch SOP under normal operation and fault conditions of the distribution network. When a fault occurs, the control mode of the converter connected to the non-fault outage area is Vf control to support the load voltage and ensure continuous power supply to the non-fault outage area. At the same time, the control mode of the other converter is switched to U. dc Q is responsible for stabilizing the DC voltage.

3. The active distribution network fault recovery method considering DG power ramping characteristics and SOP overload capacity according to claim 1, characterized in that: In step (2), during the design of the distribution network fault recovery and load transfer scheme, the intelligent soft switch SOP reserves short-term overload capacity in the design stage. This is used to quickly dispatch main grid power according to the load to be restored after a fault occurs to support the power supply restoration of the power outage area. At the same time, mathematical constraints on the capacity of the intelligent soft switch SOP considering short-term overload are established: ; In the formula: and These are the rated capacities of the converters at nodes i and j, respectively. These represent the active power and reactive power output at time t during the short-term overload process of the converters at nodes i and j, respectively. It is the ratio of overload power to rated capacity.

4. The active distribution network fault recovery method considering DG power ramping characteristics and SOP overload capacity according to claim 1, characterized in that: In step (3), the power ramping characteristics of the distributed generation (DG) are used to incorporate the DG power ramping process into the fault recovery method. After the DG exits the low-voltage ride-through, the DG output begins to ramp up at a certain rate to quickly restore power to the non-faulty area. The DG power ramping process is defined as follows: In the formula: The distributed generation (DG) begins its power ramp-up. When the output power of the distributed generation (DG) returns to its pre-fault state, the power ramp-up of the DG ends. ; For distributed generation (DG) on node n Active power constantly injected into the power grid; For distributed generation (DG) on node n The active power injected into the grid at any time; This refers to the power ramp-up rate of the distributed generation (DG) during the ramp-up period. .

5. The active distribution network fault recovery method considering DG power ramping characteristics and SOP overload capacity according to claim 1, characterized in that: The intelligent soft switch SOP load shedding capability in step (3) is used to incorporate the intelligent soft switch SOP load shedding process into the fault recovery method, so as to avoid further expansion of the fault range due to long-term short-term overload of the intelligent soft switch SOP during the distribution network recovery process. The intelligent soft switch SOP load shedding process is defined as follows: ; In the formula, , The smart soft switch SOPs on nodes i and j are respectively located at nodes i and j. Active power constantly injected into the power grid; , The smart soft switch SOPs on nodes i and j are respectively located at nodes i and j. The active power constantly injected into the power grid. For the load shedding rate of the intelligent soft switch SOP, .

6. The active distribution network fault recovery method considering DG power ramping characteristics and SOP overload capacity according to claim 1, characterized in that: Step (3) considers the power ramping characteristics of distributed generation (DG) and the load shedding capacity of the smart soft switch (SOP). This method is used to determine the load shedding rate of the smart soft switch (SOP) before the DG and SOP have restored their rated output. The SOP adjusts the recovery plan based on the power ramping rate and rated power of the DG. for: In the formula, , It is the ratio of overload power to rated capacity. The power ramp-up rate of the distributed generation (DG) during the ramp-up period.

7. The active distribution network fault recovery method considering DG power ramping characteristics and SOP overload capacity according to claim 1, characterized in that: In step (4), the distributed generation (DG) and the smart soft switch (SOP) are simultaneously restored to their rated capacity. The distribution network fault recovery result is determined by considering the power ramping characteristics of the distributed generation (DG) and the overload reduction capability of the smart soft switch (SOP), and the distribution network fault recovery scheme is determined.

8. An active distribution network with intelligent soft switch SOP, including a multi-time fault recovery method for an active distribution network with intelligent soft switch SOP, characterized in that: The active distribution network fault recovery method with intelligent soft switch SOP includes the active distribution network fault recovery method as described in any one of claims 1-7, which considers the DG power ramping characteristics and the SOP overload reduction capability.

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