A method, device, equipment and medium for fixed value adaptability evaluation of an active power distribution network

Abstract

The application discloses a kind of active distribution network fixed value adaptability evaluation method, device, equipment and medium.Therein, the method includes by the first electrical parameter of target substation and the second electrical parameter of this line, respectively determine this line prospective capacity, this line external photovoltaic help increase current capacity, this line external photovoltaic help increase prospective capacity, fixed value allow this line external photovoltaic help increase insurance capacity, fixed value allow this line photovoltaic insurance capacity, current photovoltaic maximum reverse current, prospective photovoltaic maximum reverse current, current overcurrent I section fixed value dodge first tripping switch reliable coefficient and current overcurrent III section fixed value sensitivity coefficient;On the basis of the above parameters, determine the target adaptability of current overcurrent fixed value, and based on adaptability judge the target risk level of current overcurrent fixed value and provide the suggested value of overcurrent fixed value.This technical solution can quickly and accurately evaluate the adaptability of fixed value in distributed photovoltaic high penetration rate distribution network, improve the safety and reliability of distribution network.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power systems, and particularly relates to a fixed value adaptability evaluation method, device and equipment of an active distribution network and a medium. BACKGROUND

[0002] Fixed value adaptability refers to the adaptability of protection fixed values of each relay protection device in a power system under different operating conditions. In existing schemes, for the fixed values of a distribution network, all modeling is usually adopted to calculate the fixed value adaptability of all circuit breakers.

[0003] With the in-depth development of the double-carbon construction, a large number of distributed photovoltaic power sources are connected to the traditional distribution network, the traditional radial power grid is transformed into a multi-terminal active network, and phenomena such as fault current distribution, reverse fault current, boost and external pumping occur, which results in weak adaptability of the fixed values of the distribution network and reduces the power supply reliability. If the traditional fixed value adaptability calculation method is still used, it will result in too much work, and a large amount of manpower and time will be consumed, and the efficiency is low.

[0004] Therefore, how to provide a technical scheme capable of quickly and accurately evaluating the protection fixed value adaptability of a distributed photovoltaic high-penetration distribution network is a technical problem to be solved by those skilled in the art. SUMMARY

[0005] The present application relates to the technical field of power systems, and particularly relates to a fixed value adaptability evaluation method, device and equipment of an active distribution network and a medium.

[0006] According to an aspect of the present application, there is provided a fixed value adaptability evaluation method of an active power distribution network, comprising: obtaining a first electrical parameter of a target substation and a second electrical parameter of a current line; wherein the first electrical parameter comprises a current capacity of the whole station, a prospective capacity of the whole station, a large mode system impedance and a small mode system impedance, and the second electrical parameter comprises a current capacity of the current line, an openable capacity of the current line, a maximum allowable current of the current line, an impedance value from the current line to a first tripping switch, a longest path line impedance, a current overcurrent I section fixed value and a current overcurrent III section fixed value; determining a prospective capacity of the current line, an external photovoltaic assisted current capacity of the current line, an external photovoltaic assisted prospective capacity of the current line, a fixed value allowed external photovoltaic assisted insurance capacity of the current line, a fixed value allowed photovoltaic insurance capacity of the current line, a current photovoltaic maximum reverse current, a prospective photovoltaic maximum reverse current, a reliability coefficient of the current overcurrent I section fixed value to avoid the first tripping switch and a sensitivity coefficient of the current overcurrent III section fixed value, according to the first electrical parameter and the second electrical parameter; determining a target adaptability of a current overcurrent fixed value according to the current capacity of the current line, the prospective capacity of the current line, the external photovoltaic assisted current capacity of the current line, the external photovoltaic assisted prospective capacity of the current line, the fixed value allowed external photovoltaic assisted insurance capacity of the current line, the fixed value allowed photovoltaic insurance capacity of the current line, the current photovoltaic maximum reverse current, the prospective photovoltaic maximum reverse current, the maximum allowable current of the current line, the reliability coefficient of the current overcurrent I section fixed value to avoid the first tripping switch and the sensitivity coefficient of the current overcurrent III section fixed value; wherein the target adaptability comprises at least one of a first adaptability of the current overcurrent I section fixed value and a second adaptability of the current overcurrent III section fixed value; determining a target risk level of the current overcurrent fixed value according to the target adaptability and a preset evaluation standard, and determining a suggested value of the current overcurrent fixed value according to the first electrical parameter, the second electrical parameter, the external photovoltaic assisted prospective capacity of the current line, the prospective capacity of the current line and the prospective photovoltaic maximum reverse current when the target risk level is higher than a preset level; wherein the target risk level comprises at least one of a first risk level of the current overcurrent I section fixed value and a second risk level.

[0007] Further, the target adaptability of the current overcurrent setting is determined according to the current capacity of the line, the future capacity of the line, the current capacity of the external photovoltaic assisted increment of the line, the future capacity of the external photovoltaic assisted increment of the line, the fixed value of the allowed external photovoltaic assisted increment of the line, the fixed value of the allowed photovoltaic insurance of the line, the current maximum reverse current of the photovoltaic, the future maximum reverse current of the photovoltaic, the maximum allowed current of the line, the reliability coefficient of the current overcurrent I section fixed value avoiding the first tripping switch, and the sensitivity coefficient of the current overcurrent III section fixed value, including: the first adaptability of the current overcurrent I section fixed value is determined according to the current capacity of the external photovoltaic assisted increment of the line, the future capacity of the external photovoltaic assisted increment of the line, the fixed value of the allowed external photovoltaic assisted increment of the line, and the reliability coefficient of the current overcurrent I section fixed value avoiding the first tripping switch; and / or, the second adaptability of the current overcurrent III section fixed value is determined according to the current capacity of the line, the future capacity of the line, the fixed value of the allowed photovoltaic insurance of the line, the current maximum reverse current of the photovoltaic, the future maximum reverse current of the photovoltaic, the maximum allowed current of the line, and the sensitivity coefficient of the current overcurrent III section fixed value.

[0008] Further, the first adaptability of the current overcurrent I section fixed value is determined according to the current capacity of the external photovoltaic assisted increment of the line, the future capacity of the external photovoltaic assisted increment of the line, the fixed value of the allowed external photovoltaic assisted increment of the line, and the reliability coefficient of the current overcurrent I section fixed value avoiding the first tripping switch, including: the first sub-adaptability of the current overcurrent I section fixed value is determined according to the reliability coefficient of the current overcurrent I section fixed value avoiding the first tripping switch; the second sub-adaptability of the current overcurrent I section fixed value is determined according to the current capacity of the external photovoltaic assisted increment of the line and the fixed value of the allowed external photovoltaic assisted increment of the line; the third sub-adaptability of the current overcurrent I section fixed value is determined according to the future capacity of the external photovoltaic assisted increment of the line and the fixed value of the allowed external photovoltaic assisted increment of the line; and the first adaptability of the current overcurrent I section fixed value is determined according to the first sub-adaptability, the second sub-adaptability, and the third sub-adaptability.

[0009] Further, the target risk level of the current overcurrent setting is determined according to the target adaptability and a preset evaluation standard, including: if the first adaptability is the first sub-adaptability and the second sub-adaptability is not adapted, it is determined that the first risk level is a red warning; if the first adaptability is the first sub-adaptability, it is determined that the first risk level is an orange warning; if the first adaptability is the second sub-adaptability and the third sub-adaptability is not adapted, it is determined that the first risk level is a yellow warning; and if the first adaptability is the third sub-adaptability, it is determined that the first risk level is a blue warning.

[0010] Further, determining a target adaptability of the current overcurrent setting according to the current capacity of the line, the prospective capacity of the line, the setting allowed capacity of the line for photovoltaic insurance, the current maximum reverse current of photovoltaic, the prospective maximum reverse current of photovoltaic, the maximum allowed current of the line and the sensitivity coefficient of the current overcurrent III section setting, comprising: determining a fourth sub adaptability of the current overcurrent III section setting without considering photovoltaic according to the sensitivity coefficient of the current overcurrent III section setting; determining a fifth sub adaptability of the current overcurrent III section setting according to the current capacity of the line, the setting allowed capacity of the line for photovoltaic insurance, the current maximum reverse current of photovoltaic and the maximum allowed current of the line; determining a sixth sub adaptability of the current overcurrent III section setting according to the prospective capacity of the line, the setting allowed capacity of the line for photovoltaic insurance, the prospective maximum reverse current of photovoltaic and the maximum allowed current of the line; determining a second adaptability of the current overcurrent III section setting according to the fourth sub adaptability, the fifth sub adaptability and the sixth sub adaptability of the current overcurrent III section setting.

[0011] Further, determining a target risk level of the current overcurrent setting according to the target adaptability and a preset evaluation standard, comprising: determining the second risk level as a red warning if the second adaptability is the fourth sub adaptability and the fifth sub adaptability; determining the second risk level as an orange warning if the second adaptability is the fourth sub adaptability; determining the second risk level as a yellow warning if the second adaptability is the fifth sub adaptability and the sixth sub adaptability; determining the second risk level as a blue warning if the second adaptability is the third sub adaptability.

[0012] Further, determining a current capacity of photovoltaic outside the line for assisting increment according to the first electrical parameter and the second electrical parameter, comprising: determining the current capacity of photovoltaic outside the line for assisting increment according to the current capacity of the whole station and the current capacity of the line.

[0013] Further, determining a prospective capacity of photovoltaic outside the line for assisting increment according to the first electrical parameter and the second electrical parameter, comprising: determining the prospective capacity of photovoltaic outside the line for assisting increment according to the prospective capacity of the whole station and the prospective capacity of the line.

[0014] Further, determining a setting allowed capacity of photovoltaic outside the line for assisting increment according to the first electrical parameter and the second electrical parameter, comprising: determining a reliability coefficient of a first tripping switch of the current overcurrent setting according to the current overcurrent setting, the impedance of the main mode system and the impedance from the line to the first tripping switch; determining the setting allowed capacity of photovoltaic outside the line for assisting increment according to the reliability coefficient and the impedance of the main mode system.

[0015] Further, determining the current overcurrent setting value according to the first electrical parameter and the second electrical parameter comprises: determining a sensitivity coefficient of the current overcurrent setting value according to the current overcurrent setting value, the small-mode system impedance and the longest path line impedance; and determining the current overcurrent setting value according to the sensitivity coefficient and the longest path line impedance.

[0016] Further, determining the current overcurrent setting value according to the first electrical parameter and the second electrical parameter comprises: determining a sensitivity coefficient of the current overcurrent setting value according to the current overcurrent setting value, the small-mode system impedance and the longest path line impedance; and determining the current overcurrent setting value according to the sensitivity coefficient and the longest path line impedance.

[0017] Further, determining the current overcurrent setting value according to the first electrical parameter and the second electrical parameter comprises: determining a sensitivity coefficient of the current overcurrent setting value according to the current overcurrent setting value, the small-mode system impedance and the longest path line impedance; and determining the current overcurrent setting value according to the sensitivity coefficient and the longest path line impedance.

[0018] Further, determining the current overcurrent setting value according to the first electrical parameter and the second electrical parameter comprises: determining a sensitivity coefficient of the current overcurrent setting value according to the current overcurrent setting value, the small-mode system impedance and the longest path line impedance; and determining the current overcurrent setting value according to the sensitivity coefficient and the longest path line impedance.

[0019] According to another aspect of the present application, there is provided a device for fixed value adaptability evaluation of an active power distribution network, comprising: a parameter acquisition module, configured to acquire a first electrical parameter of a target substation and a second electrical parameter of a current line; wherein the first electrical parameter comprises a current capacity of the whole substation, a future capacity of the whole substation, a large-mode system impedance and a small-mode system impedance, and the second electrical parameter comprises a current capacity of the current line, an openable capacity of the current line, a maximum allowable current of the current line, an impedance value from the current line to a first tripping switch, a longest path line impedance, a current overcurrent I section fixed value and a current overcurrent III section fixed value; a parameter determination module, configured to determine a future capacity of the current line, an external photovoltaic assisted current capacity of the current line, an external photovoltaic assisted future capacity of the current line, a fixed value allowed external photovoltaic assisted insurance capacity of the current line, a fixed value allowed photovoltaic insurance capacity of the current line, a current photovoltaic maximum reverse current, a future photovoltaic maximum reverse current, a reliable coefficient of the current overcurrent I section fixed value to avoid the first tripping switch and a sensitivity coefficient of the current overcurrent III section fixed value, according to the first electrical parameter and the second electrical parameter; an adaptability determination module, configured to determine a target adaptability of a current overcurrent fixed value according to the current capacity of the current line, the future capacity of the current line, the external photovoltaic assisted current capacity of the current line, the external photovoltaic assisted future capacity of the current line, the fixed value allowed external photovoltaic assisted insurance capacity of the current line, the fixed value allowed photovoltaic insurance capacity of the current line, the current photovoltaic maximum reverse current, the future photovoltaic maximum reverse current, the maximum allowable current of the current line, the reliable coefficient of the current overcurrent I section fixed value to avoid the first tripping switch and the sensitivity coefficient of the current overcurrent III section fixed value; wherein the target adaptability comprises at least one of a first adaptability of the current overcurrent I section fixed value and a second adaptability of the current overcurrent III section fixed value; and an adaptability evaluation module, configured to determine a target risk level of the current overcurrent fixed value according to the target adaptability and a preset evaluation standard, and determine a recommended value of the current overcurrent fixed value according to the first electrical parameter, the second electrical parameter, the external photovoltaic assisted future capacity of the current line, the future capacity of the current line and the future photovoltaic maximum reverse current, when the target risk level is higher than a preset level; wherein the target risk level comprises at least one of a first risk level of the current overcurrent I section fixed value and a second risk level.

[0020] According to another aspect of the present application, there is provided an electronic device, comprising: at least one processor; and a memory connected with the at least one processor in communication; wherein the memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor to enable the at least one processor to perform the method for fixed value adaptability evaluation of an active power distribution network according to any one of the embodiments of the present application.

[0021] According to another aspect of the present application, a computer readable storage medium is provided, which stores computer instructions for causing a processor to implement the setting value adaptability evaluation method of the active power distribution network according to any of the embodiments of the present application when executed.

[0022] The technical solution provided by the present application determines the current line remote perspective capacity, the current line external photovoltaic assisted current capacity, the current line external photovoltaic assisted remote perspective capacity, the setting value allowed current line external photovoltaic assisted insurance capacity, the setting value allowed current line photovoltaic insurance capacity, the current photovoltaic maximum reverse current, the remote photovoltaic maximum reverse current, the current overcurrent I section setting value reliability coefficient of the first tripping switch and the current overcurrent III section setting value sensitivity coefficient based on the first electrical parameter of the target transformer substation and the second electrical parameter of the current line respectively. The target adaptability of the current overcurrent setting value is determined based on the above parameters, and the target risk level of the current overcurrent setting value is judged based on the target adaptability, and the suggestion value of the overcurrent setting value is provided. The technical solution can quickly and accurately evaluate the setting value adaptability in the distributed photovoltaic high permeability power distribution network, and improves the safety and reliability of the power distribution network.

[0023] It should be understood that the content described in this part is not intended to identify key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 A flowchart of a setting value adaptability evaluation method of an active power distribution network provided for the first embodiment of the present application.

[0025] Figure 2 A setting value adaptability evaluation case diagram provided for the second embodiment of the present application.

[0026] Figure 3 A flowchart of a setting value adaptability evaluation method of an active power distribution network provided for the second embodiment of the present application.

[0027] Figure 4 A structure diagram of a setting value adaptability evaluation device of an active power distribution network provided for the third embodiment of the present application.

[0028] Figure 5 A structure diagram of a setting value adaptability evaluation device of an active power distribution network provided for the third embodiment of the present application. DETAILED DESCRIPTION

[0029] The present application will be further described in detail through the accompanying drawings and specific embodiments.

[0030] Embodiment one

[0031] Figure 1 A flowchart of a fixed value adaptability evaluation method of an active power distribution network provided for an embodiment of the present application. The embodiment of the present application can be applicable to the case of evaluating the fixed value adaptability of a distributed photovoltaic high penetration power distribution network. The method can be executed by a fixed value adaptability evaluation device of an active power distribution network. The fixed value adaptability evaluation device of the active power distribution network can be realized in the form of hardware and / or software. The fixed value adaptability evaluation device of the active power distribution network can be configured in a device with data processing capability. As shown in the figure, the method comprises the following steps. Figure 1

[0032] S110, acquiring a first electrical parameter of a target transformer substation and a second electrical parameter of the current line. The first electrical parameter comprises the total current capacity of the station, the total prospective capacity of the station, the large system impedance and the small system impedance. The second electrical parameter comprises the current capacity of the line, the openable capacity of the line, the maximum allowable current of the line, the impedance value from the outgoing line to the first tripping switch, the longest path line impedance, the current overcurrent I section setting value and the current overcurrent III section setting value.

[0033] The total current capacity of the station can be the total distributed photovoltaic capacity of the target transformer substation in the current actual operating state, usually in kilowatts (kW) or megawatts (MW), used to indicate how much distributed photovoltaic capacity the target transformer substation currently accesses, including the distributed photovoltaic capacity already accessed and the capacity in transit of the target transformer substation.

[0034] The total prospective capacity of the station can be the expected total distributed photovoltaic capacity of the target transformer substation after future development, that is, the pre-estimated distributed photovoltaic capacity of the target transformer substation considering factors such as the distributed photovoltaic power sending situation of the target transformer substation and the load of the target transformer substation, including the distributed photovoltaic capacity already accessed, the capacity in transit and the openable capacity of the target transformer substation.

[0035] The large system impedance can be the equivalent impedance of the entire power system connected to the target transformer substation in the maximum operating mode of the power system. The maximum operating mode usually refers to the operating state in which the power source capacity in the system is the largest and the network connection is the most close. The smaller the impedance, the larger the short-circuit current in the event of a fault.

[0036] The small system impedance can be the equivalent impedance of the entire power system connected to the target transformer substation in the minimum operating mode of the power system. The minimum operating mode generally refers to the operating state in which the power source capacity in the system is the smallest and the network connection is the weakest.

[0037] The longest path line impedance of the current line can be the impedance value of the main line or branch line with the largest impedance in all possible power supply paths from the outgoing line switch of the current line to the end of the line.

[0038] ​The line-to-first-trip-switch impedance can be the line impedance between the outgoing switch of the target transformer substation and the first switch capable of implementing a trip operation.

[0039] The current overcurrent setting value can be the setting value of the current overcurrent protection currently set. When the current in the line exceeds this setting value, the overcurrent protection device will act to cut off the fault line. The current overcurrent I section setting value can be a fast-break protection setting value, which is used to quickly remove the fault when the system has a serious fault to prevent the fault range from expanding, and can generally be set to avoid the maximum short-circuit current of the first trip switch. The current overcurrent III section setting value can be a line protection sensitivity, which acts when the fault range exceeds the overcurrent I section and overcurrent II section protection range or the lower switch refuses to act, and can generally be set to avoid the maximum load current and preserve the longest path line sensitivity.

[0040] The current line capacity can be the power capacity that the distributed photovoltaic can transmit under the current actual operating state of the line, including the connected capacity and the in-transit capacity of the line.

[0041] The line open capacity can be the distributed photovoltaic capacity pre-planned by the line considering the maximum allowable transmission power of the line, the load of the line and other factors.

[0042] In addition, the transformer substation name, switch number, line name, protection CT primary value and protection CT secondary value of the target transformer substation can also be obtained.

[0043] In the embodiment of the application, the full-station current capacity, system impedance and other parameters of the target transformer substation can be obtained through the monitoring system, automation equipment and related marketing system and power dispatching system of the transformer substation. For example, the large mode system impedance and the small mode system impedance can be determined by analyzing the operating mode, network structure, equipment parameters and other factors of the system by using the setting calculation software of the power system. The current line capacity and the line prospective capacity can be obtained from the marketing 2.0 and the "online State Grid" APP. The longest path line impedance and the line-to-first-trip-switch impedance can be directly read from the database of the system.

[0044] S120, respectively determine the line prospective capacity, the line external photovoltaic assisted current capacity, the line external photovoltaic assisted prospective capacity, the setting value allowed line external photovoltaic assisted insurance capacity, the setting value allowed line photovoltaic insurance capacity, the current photovoltaic maximum reverse current, the prospective photovoltaic maximum reverse current, the current overcurrent I section setting value reliable coefficient of avoiding the first trip switch and the sensitivity coefficient of the current overcurrent III section setting value according to the first electrical parameter and the second electrical parameter.

[0045] The line future capacity can be the expected capacity of the line after future development, and can be the sum of the accessed capacity, the in-transit capacity and the openable capacity of the line. The external photovoltaic assisted current capacity of the line can be the capacity corresponding to the assisted current generated by the photovoltaic power source outside the line to the line switch at the current time. When the target transformer substation external photovoltaic power source is in operation, it can inject additional current into the line, thereby increasing the load capacity of the line. The capacity corresponding to the additional current is the external photovoltaic assisted current capacity of the line.

[0046] Optionally, the external photovoltaic assisted current capacity of the line is determined according to the first electrical parameter and the second electrical parameter, including: determining the external photovoltaic assisted current capacity of the line according to the total station current capacity and the line current capacity.

[0047] Specifically, the capacity obtained by subtracting the line current capacity from the total station current capacity can be taken as the external photovoltaic assisted current capacity of the line.

[0048] The external photovoltaic assisted future capacity of the line can be the capacity corresponding to the assisted current of the photovoltaic power source outside the line to the line, which is determined according to the current capacity and the openable capacity of the transformer substation and the line.

[0049] Optionally, the external photovoltaic assisted future capacity of the line is determined according to the first electrical parameter and the second electrical parameter, including: determining the external photovoltaic assisted future capacity of the line according to the total station future capacity and the line future capacity.

[0050] Specifically, the capacity obtained by subtracting the line future capacity from the total station future capacity can be taken as the external photovoltaic assisted future capacity of the line.

[0051] The fixed value allowed external photovoltaic assisted insurance capacity can be the maximum capacity corresponding to the assisted current of the photovoltaic power source outside the line to the line, which is allowed according to the fixed value setting of the protection device and the requirement of safe operation of the system. If the capacity exceeds the capacity, the protection device will malfunction.

[0052] Optionally, the fixed value allowed external photovoltaic assisted insurance capacity is determined according to the first electrical parameter and the second electrical parameter, including: determining the reliability coefficient of the current overcurrent I section fixed value avoiding the first tripping switch according to the current overcurrent fixed value, the large mode system impedance and the impedance from the line to the first tripping switch; determining the fixed value allowed external photovoltaic assisted insurance capacity according to the reliability coefficient and the large mode system impedance.

[0053] Specifically, the fault current flowing through the first tripping switch in the fault condition can be determined according to the large-mode system impedance and the impedance value of the outgoing line to the first tripping switch; and the reliability coefficient of the first tripping switch in the current overcurrent I section can be determined according to the ratio of the current overcurrent setting value to the fault current. Then, the setting value of the allowed photovoltaic insurance capacity of the outgoing line can be determined according to the reliability coefficient and the large-mode system impedance.

[0054] The setting value of the allowed photovoltaic insurance capacity of the outgoing line can be the maximum capacity corresponding to the external current generated by the photovoltaic power supply of the outgoing line under the setting value of the protection device and the requirement of safe operation of the system. If the capacity is exceeded, the protection device will refuse to act.

[0055] Optionally, the setting value of the allowed photovoltaic insurance capacity of the outgoing line is determined according to the first electrical parameter and the second electrical parameter, including: determining a sensitivity coefficient of the current overcurrent III section setting value according to the current overcurrent setting value, the small-mode system impedance and the longest path line impedance; and determining the setting value of the allowed photovoltaic insurance capacity of the outgoing line according to the sensitivity coefficient and the longest path line impedance.

[0056] Specifically, the minimum short-circuit current flowing through the installation position of the protection device in the minimum operating mode when a fault occurs can be determined according to the small-mode system impedance and the longest path line impedance; the ratio of the minimum short-circuit current to the current overcurrent setting value is determined as the sensitivity coefficient; and then the setting value of the allowed photovoltaic insurance capacity of the outgoing line is determined according to the sensitivity coefficient and the longest path line impedance.

[0057] The current photovoltaic maximum reverse current can be the maximum reverse current that the photovoltaic power supply of the outgoing line can generate when a fault occurs outside the outgoing line under the current photovoltaic capacity. Optionally, the current photovoltaic maximum reverse current is determined according to the first electrical parameter and the second electrical parameter, including: determining the current photovoltaic maximum reverse current according to the current capacity of the outgoing line.

[0058] Specifically, the current photovoltaic maximum reverse current can be calculated in combination with the characteristics of the photovoltaic inverter and the current capacity of the outgoing line. For example, if the amplitude limiting coefficient of a certain photovoltaic inverter is 1.2, the current photovoltaic maximum reverse current can be calculated using the following formula: In the formula, I' represents the current photovoltaic maximum reverse current, and S' represents the current capacity of the outgoing line. For another example, a power system simulation software can be used to establish a model including a substation system, a photovoltaic system and the outgoing line, and to simulate the reverse current under different operating conditions.

[0059] The prospective photovoltaic maximum reverse current can be the maximum reverse current that the photovoltaic power supply of the outgoing line can generate when a fault occurs outside the outgoing line under the prospective photovoltaic capacity.

[0060] Optionally, the prospective photovoltaic maximum reverse current is determined according to the first electrical parameter and the second electrical parameter, including: the prospective photovoltaic maximum reverse current is determined according to the prospective capacity of the line.

[0061] Specifically, the current photovoltaic maximum reverse current can be calculated in combination with the photovoltaic inverter characteristics and the current capacity of the line. For example, if the amplitude limiting coefficient of a photovoltaic inverter is 1.2, the prospective photovoltaic maximum reverse current can be calculated by the following formula: In the formula, I'' represents the prospective photovoltaic maximum reverse current, and S'' represents the prospective capacity of the line. For another example, the power system simulation software can be used to establish a model including the substation system, the photovoltaic system and the line, and to simulate the reverse current under different operating conditions.

[0062] The above technical solution has the beneficial effect of improving the accuracy of parameter determination, thereby improving the accuracy of setting value adaptability.

[0063] S130, determining a target adaptability of the current overcurrent setting value according to the current capacity of the line, the prospective capacity of the line, the current capacity of the external photovoltaic capacity of the line, the prospective capacity of the external photovoltaic capacity of the line, the setting value allowed external photovoltaic capacity of the line, the setting value allowed photovoltaic capacity of the line, the current photovoltaic maximum reverse current, the prospective photovoltaic maximum reverse current, the reliable coefficient of the current overcurrent I section setting value to the first tripping switch and the sensitivity coefficient of the current overcurrent III section setting value; wherein the target adaptability includes at least one of the first adaptability of the current overcurrent I section setting value and the second adaptability of the current overcurrent III section setting value.

[0064] The adaptability of the current overcurrent setting value can be the adaptability of the current overcurrent setting value to the current capacity and / or the prospective capacity. Specifically, adaptability or non-adaptability can be used to represent adaptability, and 0 can be used to represent non-adaptability and 1 can be used to represent adaptability.

[0065] Specifically, whether there is sufficient photovoltaic capacity margin for the current overcurrent setting value under the current state can be determined according to the current capacity of the line, the current capacity of the external photovoltaic capacity of the line, the setting value allowed external photovoltaic capacity of the line, the setting value allowed photovoltaic capacity of the line and the current photovoltaic maximum reverse current; whether there is sufficient photovoltaic capacity margin for the overcurrent setting value under the prospective state can be determined according to the prospective capacity of the line, the prospective capacity of the external photovoltaic capacity of the line, the setting value allowed external photovoltaic capacity of the line, the setting value allowed photovoltaic capacity of the line and the prospective photovoltaic maximum reverse current; and then the target adaptability of the current overcurrent setting value is determined according to the above determination results.

[0066] S140, determining a target risk level of the current overcurrent setting value according to the target adaptability and a preset evaluation standard, and determining a recommended value of the current overcurrent setting value according to the first electrical parameter, the second electrical parameter, the out-of-circuit photovoltaic assisted far-sighted capacity, the far-sighted capacity of the line and the far-sighted maximum reverse current of the photovoltaic when the target risk level is higher than a preset level; wherein the target risk level comprises at least one of a first risk level of the current overcurrent I section setting value and a second risk level.

[0067] The preset level can be that a recommended value is required for red, orange and yellow early warnings, or a recommended value can be required only for red and orange early warnings.

[0068] The target risk level can be used to represent the rationality of the setting of the current overcurrent setting value. For example, a low risk level can mean that the overcurrent setting value is set reasonably, and there is sufficient margin for overcurrent protection under normal operation and common fault conditions, which can ensure the selectivity and sensitivity of protection; a medium risk level can mean that there is a certain risk under certain specific conditions. For example, when the system operation mode changes greatly, the overcurrent setting value can not be accurate enough, which can increase the probability of protection misoperation or refusal, and the overcurrent setting value needs to be monitored and adjusted regularly to ensure its effectiveness under different operating conditions; a high risk level can mean that the overcurrent setting value is set unreasonably, which can cause a high risk and can lead to overcurrent protection misoperation or refusal, which can affect the safe and stable operation of the power system or the power supply reliability, and the overcurrent setting value needs to be re-evaluated and adjusted immediately to avoid major accidents.

[0069] In the embodiment of the application, the adaptability of the current overcurrent setting value can be classified according to the preset evaluation standard, and the target risk level corresponding to the adaptability of the current overcurrent setting value is determined.

[0070] When the target risk level is higher than the preset level, it indicates that the adaptability of the current overcurrent setting value is not strong, and the power supply reliability is low. Therefore, the application determines the recommended value of the current overcurrent setting value according to the first electrical parameter, the second electrical parameter, the out-of-circuit photovoltaic assisted far-sighted capacity, the far-sighted capacity of the line and the far-sighted maximum reverse current of the photovoltaic.

[0071] Specifically, the recommended overcurrent setting value can be calculated using an overcurrent protection setting formula according to the first electrical parameter, the second electrical parameter and the out-of-circuit photovoltaic assisted far-sighted capacity, the far-sighted capacity of the line and the far-sighted maximum reverse current of the photovoltaic, such as system impedance, line capacity, etc. For example, the overcurrent setting value can be determined according to the minimum fault current and the protection sensitivity requirement.

[0072] Optionally, the suggestion value of the current over-flow fixed value is determined according to the first electrical parameter, the second electrical parameter, the out-of-line photovoltaic assisted remote-sight capacity, the line remote-sight capacity and the remote-sight photovoltaic maximum reverse current, including: determining a suggestion over-flow I section fixed value lower limit according to the out-of-line photovoltaic assisted remote-sight capacity, the large mode system impedance and the out-of-line to first tripping switch impedance value; determining a suggestion over-flow I section fixed value upper limit according to the small mode system impedance; determining a suggestion over-flow III section fixed value lower limit according to the line maximum allowed current and the remote-sight photovoltaic maximum reverse current; determining a suggestion over-flow III section fixed value upper limit according to the line remote-sight capacity, the small mode system impedance and the longest path line impedance.

[0073] For the suggestion over-flow I section fixed value lower limit, the total impedance from the power supply to the first tripping switch under the maximum operation mode is calculated according to the large mode system impedance and the out-of-line to first tripping switch impedance value; then the photovoltaic assisted current is superimposed on the fault current when a fault occurs considering the out-of-line photovoltaic assisted remote-sight capacity; finally, in order to ensure that the over-flow I section protection can reliably avoid the first tripping switch in this case, a reliable large current value is determined according to the total impedance and the assisted capacity as the suggestion over-flow I section fixed value lower limit.

[0074] For the suggestion over-flow I section fixed value upper limit, since the short-circuit current of the system is relatively small under the minimum operation mode, the product of the system voltage and the small mode system impedance ratio is determined as the suggestion over-flow I section fixed value upper limit to ensure that the over-flow I section protection reliably acts when the outlet fails during two-phase short-circuit.

[0075] For the suggestion over-flow III section fixed value lower limit, since the remote-sight photovoltaic reverse current exists, the influence of the remote-sight photovoltaic maximum reverse current on the protection needs to be considered when determining the suggestion over-flow III section fixed value lower limit, and if the remote-sight photovoltaic maximum reverse current is large, it may cause the over-flow III section protection to malfunction. Therefore, the larger value of 1.33 times the line maximum allowed current and the remote-sight photovoltaic maximum reverse current is taken as the suggestion over-flow III section fixed value lower limit.

[0076] For the suggestion over-flow III section fixed value upper limit, the minimum short-circuit current that may occur at the end of the line when two-phase short-circuit occurs is calculated according to the line remote-sight capacity, the small mode system impedance and the longest path line impedance, and the result is divided by 1.3 as the suggestion over-flow III section fixed value upper limit.

[0077] Optionally, for the distribution line whose risk level meets the preset level, the fixed value optimization suggestion value is automatically calculated to improve the pertinence and convenience of the on-site rectification work. Figure 2 A fixed value adaptability evaluation case schematic diagram is provided for the embodiment one of the present application, as shown in Figure 2 ​As shown, respectively, the 10 distribution lines in the figure are evaluated for the fixed value adaptability risk level, and the fixed value optimization recommended value is calculated for the distribution lines with red and yellow early warning.

[0078] The embodiment of the application provides a fixed value adaptability evaluation method of an active power distribution network, which comprises the following steps: acquiring first electrical parameters of a target transformer substation and second electrical parameters of a line, determining a line prospective capacity, a line external photovoltaic assisted current capacity, a line external photovoltaic assisted prospective capacity, a fixed value allowed line external photovoltaic assisted insurance capacity, a fixed value allowed line photovoltaic insurance capacity, a current photovoltaic maximum reverse current and a prospective photovoltaic maximum reverse current; determining a target adaptability of a current overcurrent fixed value on the basis of the above parameters; and judging a target risk level of the current overcurrent fixed value and providing a recommended value of the overcurrent fixed value based on the adaptability. The technical scheme can quickly and accurately evaluate the fixed value adaptability of a distributed photovoltaic high-permeability power distribution network, and improves the safety and reliability of the power distribution network.

[0079] Embodiment two

[0080] Figure 3 A flowchart of a fixed value adaptability evaluation method of an active power distribution network is provided for the embodiment two of the application, and the embodiment of the application is optimized on the basis of the above embodiment. As shown in the figure, the method comprises the following steps. Figure 3

[0081] S210, acquiring first electrical parameters of a target transformer substation and second electrical parameters of a line, wherein the first electrical parameters comprise a total station current capacity, a total station prospective capacity, a large mode system impedance and a small mode system impedance, and the second electrical parameters comprise a line current capacity, a line openable capacity, a line maximum allowed current, an impedance value from an outgoing line to a first tripping switch, a longest path line impedance, a current overcurrent I section fixed value and a current overcurrent III section fixed value.

[0082] S220, determining a line prospective capacity, a line external photovoltaic assisted current capacity, a line external photovoltaic assisted prospective capacity, a fixed value allowed line external photovoltaic assisted insurance capacity, a fixed value allowed line photovoltaic insurance capacity, a current photovoltaic maximum reverse current, a prospective photovoltaic maximum reverse current, a reliability coefficient of a current overcurrent I section fixed value avoiding a first tripping switch and a sensitivity coefficient of a current overcurrent III section fixed value according to the first electrical parameters and the second electrical parameters.

[0083] S230, determining a first adaptability of a current overcurrent I section fixed value according to the line external photovoltaic assisted current capacity, the line external photovoltaic assisted prospective capacity, the fixed value allowed line external photovoltaic assisted insurance capacity and the reliability coefficient of the current overcurrent I section fixed value avoiding the first tripping switch. ​

[0084] When the three-section current protection is configured for the outgoing switch of the target substation, the current increase phenomenon caused by the access of photovoltaic will expand the protection range and cause overstep tripping. In addition to the outgoing line I-section protection, the outgoing line II-section and branch switch protection can ensure selectivity through time coordination with the lower-level protection, and the boundary switch protection is allowed to lose selectivity in the setting principle. The current drain phenomenon caused by the access of photovoltaic will reduce the range of overcurrent III-section protection and cause protection failure, and the longer the protected line and the larger the photovoltaic capacity, the more likely it is to lose sensitivity at the end of the fault. Therefore, the adaptability of the setting value of the outgoing line I-section, III-section and large branch III-section protection can be focused on during the distribution network setting calculation.

[0085] For the outgoing line overcurrent I-section, affected by the fault type and fault location, in most cases, the system side provides short-circuit current mainly in the form of reactive current. If the fault point is at the end of the line, the photovoltaic on the same bus does not enter the low penetration control link, and the photovoltaic mainly outputs active current, at this time the current increase phenomenon is not obvious. If the fault point is close to the bus side, the photovoltaic on the same bus enters the deep low penetration state and outputs a large amount of reactive current, at this time the current increase phenomenon is more obvious. In the extreme case, the short-circuit current provided by the photovoltaic side and the short-circuit current provided by the system side are in phase, which ensures the selectivity of the outgoing line switch overcurrent I-section. Specifically, the overcurrent I-section can be checked by the following formula.

[0086] After simplification, we can get

[0087] In the formula, Vsys represents the system phase voltage, Z s.min Zsys represents the system impedance, Z L1 Zout represents the impedance from the outgoing line to the first tripping switch, I PV Iph represents the maximum short-circuit current provided by the photovoltaic before the protection installation, which is generally considered as 1.2 times the rated current, k rel k represents the current increase coefficient.

[0088] Optionally, the first adaptability of the current overcurrent I section setting value is determined according to the current out-of-line photovoltaic assisted current capacity, the future out-of-line photovoltaic assisted capacity, the fixed value allowed out-of-line photovoltaic assisted insurance capacity, and the reliability coefficient of the current overcurrent I section setting value avoiding the first tripping switch, including: determining the first sub-adaptability of the current overcurrent I section setting value without considering photovoltaic according to the reliability coefficient of the current overcurrent I section setting value avoiding the first tripping switch; determining the second sub-adaptability of the current overcurrent I section setting value according to the current out-of-line photovoltaic assisted current capacity and the fixed value allowed out-of-line photovoltaic assisted insurance capacity; determining the third sub-adaptability of the current overcurrent I section setting value according to the future out-of-line photovoltaic assisted capacity and the fixed value allowed out-of-line photovoltaic assisted insurance capacity; and determining the first adaptability of the current overcurrent I section setting value according to the first sub-adaptability, the second sub-adaptability, and the third sub-adaptability.

[0089] Specifically, the reliability coefficient of the current overcurrent I section setting value avoiding the first tripping switch can be compared with a preset threshold to determine the first sub-adaptability of the current overcurrent I section setting value without considering photovoltaic, for example, if the reliability coefficient is less than 1.3, it is determined that the first sub-adaptability of the current overcurrent I section setting value without considering photovoltaic is not adaptive. Further, the current out-of-line photovoltaic assisted current capacity and the fixed value allowed out-of-line photovoltaic assisted insurance capacity can be compared to determine whether the current overcurrent I section setting value is adaptive to the current capacity of the line; the future out-of-line photovoltaic assisted capacity and the fixed value allowed out-of-line photovoltaic insurance capacity are compared to determine whether the current overcurrent I section setting value is adaptive to the future capacity of the line; and finally, the first adaptability of the current overcurrent I section setting value is determined according to the determination results of the above three sub-adaptabilities.

[0090] S240, the second adaptability of the current overcurrent III section setting value is determined according to the current capacity of the line, the future capacity of the line, the fixed value allowed photovoltaic insurance capacity of the line, the current maximum reverse current of photovoltaic, the future maximum reverse current of photovoltaic, the maximum allowed current of the line, and the sensitivity coefficient of the current overcurrent III section setting value.

[0091] For the overcurrent III section and large branch III section, the system side provides short-circuit current mainly in the form of reactive current in most cases, affected by the fault type and fault location. If the fault point is far from the distributed photovoltaic, the photovoltaic does not enter the low penetration control link, and the photovoltaic mainly outputs active current. At this time, the external pumping phenomenon is not obvious. If the fault point is close to the distributed photovoltaic, the photovoltaic enters the deep low penetration state, and the photovoltaic outputs a large amount of reactive current. At this time, the external pumping phenomenon is more obvious. In the extreme case, the short-circuit current provided by the photovoltaic side and the short-circuit current provided by the system side are in phase, which ensures the sensitivity of the line end short circuit in the minimum operating mode. Specifically, the overcurrent III section and the large branch III section can be checked by the following formula.

[0092] After simplification, we can get

[0093] In the formula, , which represents the system phase voltage, Z L1 , which represents the longest path line impedance, I PV , which represents the maximum short-circuit current provided by the photovoltaic after the protection installation, generally considering 1.2 times the rated current, k sen , which represents the present operating value sensitivity coefficient, Z s.max , which represents the small mode system impedance, Z s.max is the sum of the small mode system impedance and the line impedance from the protection installation to the bus.

[0094] Optionally, according to the current capacity of the line, the future capacity of the line, the value allowed photovoltaic insurance capacity of the line, the current maximum reverse current of the photovoltaic, the future maximum reverse current of the photovoltaic, the maximum allowed current of the line, and the sensitivity coefficient of the current overcurrent III section value, the second adaptability of the current overcurrent III section value is determined, including: according to the current overcurrent III section value sensitivity coefficient, determining the fourth sub-adaptability of the current overcurrent III section value without considering photovoltaic; according to the current capacity of the line, the value allowed photovoltaic insurance capacity of the line, the current maximum reverse current of the photovoltaic, and the maximum allowed current of the line, determining the fifth sub-adaptability of the current overcurrent III section value; according to the future capacity of the line, the value allowed photovoltaic insurance capacity of the line, the future maximum reverse current of the photovoltaic, and the maximum allowed current of the line, determining the sixth sub-adaptability of the current overcurrent III section value; according to the fourth sub-adaptability, the fifth sub-adaptability, and the sixth sub-adaptability, determining the second adaptability of the current overcurrent III section value.

[0095] Specifically, the current overcurrent III section fixed value sensitivity coefficient can be compared with a preset threshold to determine the first sub-adaptability of the current overcurrent III section fixed value without considering photovoltaic, for example, if the sensitivity coefficient is less than 1.3, it is determined that the first sub-adaptability of the current overcurrent I section fixed value without considering photovoltaic is not adaptive; the current photovoltaic capacity of the line is compared with the fixed value allowed photovoltaic insurance capacity of the line, and the current maximum reverse current of photovoltaic is compared with the maximum allowed current of the line, both of which together determine whether the current overcurrent III section fixed value is adaptive to the current capacity of the line, only when the above two criteria are simultaneously adaptive, the overcurrent III section fixed value is adaptive to the current capacity of the line; the prospective capacity of the line is compared with the fixed value allowed photovoltaic insurance capacity of the line, and the maximum reverse current of the prospective photovoltaic is compared with the maximum allowed current of the line, both of which together determine whether the current overcurrent III section fixed value is adaptive to the prospective capacity of the line, only when the above two criteria are simultaneously adaptive, the overcurrent III section fixed value is adaptive to the prospective capacity of the line; and then the second adaptability of the current overcurrent III section fixed value is determined according to the determination results of the above three sub-adaptabilities.

[0096] It should be noted that the present embodiment does not limit the execution order of steps S230 and S240, and step S230 can be executed first and then step S240 can be executed, or step S240 can be executed first and then step S230 can be executed, or steps S230 and S240 can be executed simultaneously.

[0097] S250, determining a target risk level of the current overcurrent fixed value according to the target adaptability and a preset evaluation standard, and determining a suggested value of the overcurrent fixed value according to the first electrical parameter, the second electrical parameter, the prospective photovoltaic capacity outside the line, the prospective capacity of the line and the maximum reverse current of the prospective photovoltaic when the target risk level is higher than a preset level; wherein the target risk level includes at least one of the first risk level of the current overcurrent I section fixed value and the second risk level.

[0098] Among them, the preset evaluation standard can be divided into the following four kinds: 1, red warning, that is, the current running fixed value is not adaptive to the current grid-connected capacity of photovoltaic, and needs to be evaluated and optimized as soon as possible; 2, orange warning, that is, without considering photovoltaic, the current running fixed value has not adapted to the current grid-connected capacity of photovoltaic, and needs to be evaluated and optimized as soon as possible; 3, yellow warning, that is, the current running fixed value is adaptive to the current grid-connected capacity of photovoltaic, and is not adaptive to the prospective grid-connected capacity, and needs to be kept attention; 4, blue warning, that is, the current running fixed value is adaptive to the prospective grid-connected capacity of photovoltaic, and does not need to be optimized.

[0099] Optionally, for the current overcurrent I section setting value, the target risk level of the current overcurrent setting value is determined according to the target adaptability and the preset evaluation standard, including: if the first adaptability is that the first sub-adaptability is adapted and the second sub-adaptability is not adapted, determining that the first risk level is a red warning; if the first adaptability is that the first sub-adaptability is not adapted, determining that the first risk level is an orange warning; if the first adaptability is that the second sub-adaptability is adapted and the third sub-adaptability is not adapted, determining that the first risk level is a yellow warning; if the first adaptability is that the third sub-adaptability is adapted, determining that the first risk level is a blue warning.

[0100] Optionally, for the current overcurrent III section setting value, the target risk level of the current overcurrent setting value is determined according to the target adaptability and the preset evaluation standard, including: if the second adaptability is that the fourth sub-adaptability is adapted and the fifth sub-adaptability is not adapted, determining that the second risk level is a red warning; if the second adaptability is that the fourth sub-adaptability is not adapted, determining that the second risk level is an orange warning; if the second adaptability is that the fifth sub-adaptability is adapted and the sixth sub-adaptability is not adapted, determining that the second risk level is a yellow warning; if the second adaptability is that the sixth sub-adaptability is adapted, determining that the second risk level is a blue warning.

[0101] The embodiment of the present application provides a setting value adaptability evaluation method of an active power distribution network, and adaptabilities of overcurrent I section, III section and large branch III section protection setting values are evaluated respectively, so that the setting value adaptability evaluation precision of the active power distribution network in the distributed photovoltaic high permeability power distribution network is further improved.

[0102] Embodiment three

[0103] Figure 4 A structure schematic diagram of a setting value adaptability evaluation device of an active power distribution network provided by the embodiment three is shown in the figure. Figure 4 As shown in the figure, the device comprises the following modules.

[0104] The parameter acquisition module 310 is used for acquiring the first electrical parameter of the target substation and the second electrical parameter of the line, wherein the first electrical parameter comprises the current capacity of the whole station, the prospective capacity of the whole station, the large mode system impedance and the small mode system impedance, and the second electrical parameter comprises the current capacity of the line, the openable capacity of the line, the maximum allowable current of the line, the impedance value from the outgoing line to the first tripping switch, the longest path line impedance, the current overcurrent I section setting value and the current overcurrent III section setting value.

[0105] The parameter determination module 320 is configured to determine, according to the first electrical parameter and the second electrical parameter, a line future capacity, a line external photovoltaic boost current capacity, a line external photovoltaic boost future capacity, a line external photovoltaic boost insurance capacity, a line photovoltaic insurance capacity, a current photovoltaic maximum reverse current, a future photovoltaic maximum reverse current, a current overcurrent I section value reliability coefficient of a first tripping switch, and a current overcurrent III section value sensitivity coefficient.

[0106] The adaptability determination module 330 is configured to determine, according to the line current capacity, the line future capacity, the line external photovoltaic boost current capacity, the line external photovoltaic boost future capacity, the line external photovoltaic boost insurance capacity, the line photovoltaic insurance capacity, the current photovoltaic maximum reverse current, the future photovoltaic maximum reverse current, a line maximum allowable current, the current overcurrent I section value reliability coefficient of the first tripping switch, and the current overcurrent III section value sensitivity coefficient, a target adaptability of a current overcurrent value; wherein the target adaptability includes at least one of a first adaptability of the current overcurrent I section value and a second adaptability of the current overcurrent III section value.

[0107] The adaptability evaluation module 340 is configured to determine, according to the target adaptability and a preset evaluation standard, a target risk level of the current overcurrent value, and determine, when the target risk level is higher than a preset level, a suggested value of the current overcurrent value according to the first electrical parameter, the second electrical parameter, the line external photovoltaic boost future capacity, the line future capacity, and the future photovoltaic maximum reverse current; wherein the target risk level includes at least one of a first risk level of the current overcurrent I section value and a second risk level.

[0108] The scheme has the advantage that the adaptability of the fixed value can be quickly and accurately evaluated in the distributed photovoltaic high-penetration power distribution network, and the safety and reliability of the power distribution network are improved.

[0109] Further, the adaptive determination module 330 comprises: a first adaptive determination unit configured to determine a first adaptability of the current overcurrent I segment setting value according to the current off-line photovoltaic boost capacity, the future off-line photovoltaic boost capacity, the fixed value allowed off-line photovoltaic boost insurance capacity, and a reliability coefficient of the current overcurrent I segment setting value avoiding the first tripping switch; and / or a second adaptive determination unit configured to determine a second adaptability of the current overcurrent III segment setting value according to the current line capacity, the future line capacity, the fixed value allowed line photovoltaic insurance capacity, the current photovoltaic maximum reverse current, the future photovoltaic maximum reverse current, the maximum allowed current of the line, and a sensitivity coefficient of the current overcurrent III segment setting value.

[0110] Further, the first adaptive determination unit comprises: a first sub-adaptive determination sub-unit configured to determine a first sub-adaptability of the current overcurrent I segment setting value without considering photovoltaic according to the reliability coefficient of the current overcurrent I segment setting value avoiding the first tripping switch; a second sub-adaptive determination sub-unit configured to determine a second sub-adaptability of the current overcurrent I segment setting value according to the current off-line photovoltaic boost capacity and the fixed value allowed off-line photovoltaic boost insurance capacity; a third sub-adaptive determination sub-unit configured to determine a third sub-adaptability of the current overcurrent I segment setting value according to the future off-line photovoltaic boost capacity and the fixed value allowed off-line photovoltaic boost insurance capacity; and an overcurrent I segment setting value adaptability determination sub-unit configured to determine the first adaptability of the current overcurrent I segment setting value according to the first sub-adaptability, the second sub-adaptability, and the third sub-adaptability.

[0111] Further, the adaptability evaluation module 340 comprises: a first early warning unit configured to determine that the first risk level is red early warning if the first adaptability is the first sub-adaptability and the second sub-adaptability is not adapted; a second early warning unit configured to determine that the first risk level is orange early warning if the first adaptability is the first sub-adaptability not adapted; a third early warning unit configured to determine that the first risk level is yellow early warning if the first adaptability is the second sub-adaptability and the third sub-adaptability is not adapted; and a fourth early warning unit configured to determine that the first risk level is blue early warning if the first adaptability is the third sub-adaptability.

[0112] Further, the second adaptability determining unit comprises: a fourth sub-adaptability determining sub-unit, configured to determine a fourth sub-adaptability of the current overcurrent III segment constant value without considering photovoltaic according to the constant value sensitivity coefficient of the current overcurrent III segment; a fifth sub-adaptability determining sub-unit, configured to determine a fifth sub-adaptability of the current overcurrent III segment constant value according to the current capacity of the current line, the constant value allowed photovoltaic insurance capacity of the current line, the current maximum reverse current of the photovoltaic, and the maximum allowed current of the current line; a sixth sub-adaptability determining sub-unit, configured to determine a sixth sub-adaptability of the current overcurrent III segment constant value according to the prospective capacity of the current line, the constant value allowed photovoltaic insurance capacity of the current line, the prospective maximum reverse current of the photovoltaic, and the maximum allowed current of the current line; and an overcurrent III segment constant value adaptability determining sub-unit, configured to determine the second adaptability of the current overcurrent III segment constant value according to the fourth sub-adaptability, the fifth sub-adaptability, and the sixth sub-adaptability.

[0113] Further, the adaptability evaluation module 340 comprises: a fifth early warning unit, configured to determine that the second risk level is red early warning if the second adaptability is the second sub-adaptability inadaptation; a sixth early warning unit, configured to determine that the second risk level is orange early warning if the second adaptability is the fourth sub-adaptability inadaptation; a seventh early warning unit, configured to determine that the second risk level is yellow early warning if the second adaptability is the second sub-adaptability adaptation and the third sub-adaptability inadaptation; and an eighth early warning unit, configured to determine that the second risk level is blue early warning if the second adaptability is the third sub-adaptability adaptation.

[0114] Further, the parameter determining module 320 comprises: a current line external photovoltaic assisted current capacity determining unit, configured to determine the current line external photovoltaic assisted current capacity according to the total station current capacity and the current line current capacity.

[0115] Further, the parameter determining module 320 comprises: a current line external photovoltaic assisted prospective capacity determining unit, configured to determine the current line external photovoltaic assisted prospective capacity according to the total station prospective capacity and the current line prospective capacity.

[0116] Further, the parameter determining module 320 comprises: a reliability coefficient determining unit, configured to determine the reliability coefficient of the first tripping switch of the current overcurrent constant value according to the current overcurrent constant value, the large mode system impedance, and the impedance from the outgoing line to the first tripping switch; and a constant value allowed current line external photovoltaic assisted insurance capacity determining unit, configured to determine the constant value allowed current line external photovoltaic assisted insurance capacity according to the reliability coefficient and the large mode system impedance.

[0117] Further, the parameter determination module 320 comprises: a sensitivity coefficient determination unit, configured to determine a sensitivity coefficient of the current overcurrent fixed value according to the current overcurrent fixed value, the small-mode system impedance and the longest path line impedance; and a fixed value allowed local line photovoltaic insurance capacity determination unit, configured to determine a fixed value allowed local line photovoltaic insurance capacity according to the sensitivity coefficient and the longest path line impedance.

[0118] Further, the parameter determination module 320 comprises: a current photovoltaic maximum reverse current determination unit, configured to determine a current photovoltaic maximum reverse current according to the current local line capacity.

[0119] Further, the parameter determination module 320 comprises: a prospective photovoltaic maximum reverse current determination unit, configured to determine a prospective photovoltaic maximum reverse current according to the prospective local line capacity.

[0120] Further, the adaptability evaluation module 340 comprises: a first suggestion value determination unit, configured to determine a suggestion overcurrent I-section fixed value lower limit according to the local line external photovoltaic capacity, the large-mode system impedance and the outgoing line to the first tripping switch impedance value; a second suggestion value determination unit, configured to determine a suggestion overcurrent I-section fixed value upper limit according to the small-mode system impedance; a third suggestion value determination unit, configured to determine a suggestion overcurrent III-section fixed value lower limit according to the maximum allowed current of the local line and the prospective photovoltaic maximum reverse current; and a fourth suggestion value determination unit, configured to determine a suggestion overcurrent III-section fixed value upper limit according to the prospective local line capacity, the small-mode system impedance and the longest path line impedance.

[0121] The overcurrent fixed value adaptability evaluation device of the active power distribution network in the embodiment of the application can be a device, or a component, an integrated circuit or a chip in a terminal. The device can be a mobile electronic device or a non-mobile electronic device. Illustratively, the mobile electronic device can be a mobile phone, a tablet computer, a notebook computer, a palm computer, a vehicle-mounted electronic device, a wearable device, an ultra-mobile personal computer (UMPC), a netbook or a personal digital assistant (PDA), etc., and the non-mobile electronic device can be a server, a network attached storage (NAS), a personal computer (PC), a television (TV), a teller machine or a self-service machine, etc., and the embodiment of the application is not limited in this regard.

[0122] The active power distribution network fixed value adaptability evaluation device in the embodiment of the application can be a device with an operating system. The operating system can be an Android operating system, an iOS operating system, or other possible operating systems, and the embodiments of the application are not limited in this regard.

[0123] The active power distribution network fixed value adaptability evaluation device provided in the embodiment of the application can implement each process implemented by the method embodiment, and has the corresponding function modules and beneficial effects of the execution method.

[0124] Embodiment four

[0125] Figure 5 A structural schematic diagram of a device 10 that can be used to implement embodiments of the application is shown. The device is intended to represent various forms of digital computers, such as laptops, desktops, tablets, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. The device can also represent various forms of mobile devices, such as personal digital assistants, cellular telephones, smartphones, wearable devices (e.g., headgear, eyewear, watches, etc.), and other similar computing devices. The components shown here, their connections and relationships, and their functions, are meant to be examples only, and are not intended to limit the implementations of the application described and / or claimed in this document.

[0126] As shown in Figure 5 The device 10 includes at least one processor 11, and a memory, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., connected to the at least one processor 11 in communication, wherein the memory stores a computer program that can be executed by the at least one processor. The processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 into the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the device 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0127] A plurality of components in the device 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a magnetic disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the device 10 to exchange information / data with other devices through a computer network, such as the Internet, and / or various telecommunications networks.

[0128] The processor 11 can be various general and / or special purpose processing components having processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various specialized artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. The processor 11 performs various methods and processes described above, such as the setting value adaptability evaluation method of the active power distribution network.

[0129] In some embodiments, the setting value adaptability evaluation method of the active power distribution network can be implemented as a computer program tangibly embodied in a computer readable storage medium, such as the storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed onto the device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded onto the RAM 13 and executed by the processor 11, one or more steps of the setting value adaptability evaluation method of the active power distribution network described above can be performed. Alternatively, in other embodiments, the processor 11 can be configured to perform the setting value adaptability evaluation method of the active power distribution network by any other suitable means, such as by means of firmware.

[0130] Various implementations of the systems and techniques described above can be realized in digital electronic circuitry, integrated circuitry, a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on a chip (SOC), a programmable logic device (CPLD), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include implementation in one or more computer programs that are executable and / or interpretable on a programmable system including at least one programmable processor, which can be special or general purpose, coupled to receive data and instructions from, and to transmit data and instructions to, a storage system, at least one input device, and at least one output device.

[0131] Computer programs used to implement the methods of the application can be written in any combination of one or more programming languages. These computer programs can be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the computer program, when executed by the processor of the machine, implements the functions / acts specified in the flowcharts and / or block diagrams. The computer program can be executed entirely on a machine, partially on a machine, partially on a machine and partially on a remote machine or entirely on a remote machine or server.

[0132] In the context of this application, a computer readable storage medium can be a tangible medium that can contain or store computer programs for use by or in connection with an instruction execution system, apparatus, or device. Computer readable storage media can include, but are not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. Alternatively, a computer readable storage medium can be a machine readable signal medium. More specific examples of the machine readable storage medium will include a one or more lines of a electrical connection, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0133] To provide for interaction with a user, the systems and techniques described here can be implemented on a device having a display (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user and a keyboard and a pointing device (e.g., a mouse or a trackball) by which the user can provide input to the device. Other kinds of devices can be used to provide for interaction with a user as well; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form, including acoustic, speech, or tactile input.

[0134] The systems and techniques described here can be implemented in a computing system that includes a back end component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front end component (e.g., a user computer having a graphical user interface or a Web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such back end, middleware, or front end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include a local area network (LAN), a wide area network (WAN), blockchain network, and the Internet.

[0135] The computing system can include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system, to solve the defects of large management difficulty and weak business scalability in traditional physical host and VPS server.

[0136] It should be understood that the steps shown above in various forms of flowcharts can be reordered, added, or deleted. For example, each step described in the present application can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solutions of the present application can be achieved, which is not limited herein.

[0137] The above embodiments are merely examples for clear illustration, and are not limitations to the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments cannot be exhausted, and the obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A method for evaluating the setpoint adaptability of an active distribution network, characterized in that, The method includes: Obtain the first electrical parameters of the target substation and the second electrical parameters of this line; wherein, the first electrical parameters include the current capacity of the entire substation, the projected capacity of the entire substation, the large-mode system impedance, and the small-mode system impedance; the second electrical parameters include the current capacity of this line, the openable capacity of this line, the maximum allowable current of this line, the impedance value from the outgoing line to the first tripable switch, the impedance of the longest path line, the current overcurrent stage I setting value, and the current overcurrent stage III setting value; wherein, the current capacity of the entire substation is the total distributed photovoltaic capacity of the target substation under the current actual operating state, including the distributed photovoltaic capacity already connected to the target substation and the capacity in transit; the projected capacity of the entire substation is the expected total distributed photovoltaic capacity after the future development of the target substation, including the distributed photovoltaic capacity already connected to the target substation, the capacity in transit, and the openable capacity; the current capacity of this line is the power capacity that distributed photovoltaic can transmit under the current actual operating state of this line, including the connected capacity and the capacity in transit; the openable capacity of this line is the distributed photovoltaic capacity pre-planned for this line, taking into account the maximum allowable transmission power of this line and the load factors of this line; Based on the first electrical parameters and the second electrical parameters, determine the projected capacity of this line, the current capacity of external photovoltaic power generation, the projected capacity of external photovoltaic power generation, the setpoint-allowed capacity of external photovoltaic power generation, the setpoint-allowed capacity of photovoltaic power generation, the current maximum reverse current of photovoltaic power generation, the projected maximum reverse current of photovoltaic power generation, the reliability coefficient of the current overcurrent stage I setting to avoid the first tripping switch, and the sensitivity coefficient of the current overcurrent stage III setting. The current capacity of external photovoltaic power generation is the capacity corresponding to the boost current generated by external photovoltaic power sources on the switches of this line at the current moment. The projected capacity of external photovoltaic power generation can be determined based on the current capacity of this substation and this line. The capacity and openable capacity are determined by the expected capacity corresponding to the boost current of photovoltaic power sources outside this line to this line; wherein, the reliability coefficient of the current overcurrent stage I setting relative to the first tripable switch is determined based on the large-mode system impedance and the impedance value from the outgoing line to the first tripable switch, to determine the fault current flowing through the first tripable switch in the event of a fault, and based on the ratio of the current overcurrent setting to the fault current; the sensitivity coefficient of the current overcurrent stage III setting is determined based on the small-mode system impedance and the impedance of the longest path line, to determine the minimum short-circuit current flowing through the protection device installation point when a fault occurs under the minimum operating mode, and based on the ratio of the minimum short-circuit current to the current overcurrent setting; Based on the current capacity of this line, the projected capacity of this line, the current capacity of external photovoltaic power generation, the projected capacity of external photovoltaic power generation, the set value allows for the external photovoltaic power generation insurance capacity, the set value allows for the photovoltaic insurance capacity of this line, the current maximum reverse current of photovoltaic power generation, the projected maximum reverse current of photovoltaic power generation, the maximum allowable current of this line, the reliability coefficient of the current overcurrent stage I setting to avoid the first tripping switch, and the sensitivity coefficient of the current overcurrent stage III setting, the target adaptability of the current overcurrent setting is determined; wherein, the target adaptability includes at least one of the first adaptability of the current overcurrent stage I setting and the second adaptability of the current overcurrent stage III setting. The target risk level of the current overcurrent setting is determined based on the target adaptability and preset evaluation criteria. When the target risk level is higher than the preset level, a suggested value of the current overcurrent setting is determined based on the first electrical parameter, the second electrical parameter, the projected capacity of the external photovoltaic system, the projected capacity of the current line, and the maximum reverse current of the projected photovoltaic system. The target risk level includes at least one of the first risk level and the second risk level of the current overcurrent setting.

2. The method according to claim 1, characterized in that, Based on the current capacity of this line, the projected capacity of this line, the current capacity of external photovoltaic (PV) power generation, the projected capacity of external PV power generation, the setpoint-allowed capacity of external PV power generation, the setpoint-allowed capacity of this line's PV power generation, the current maximum reverse current of PV power generation, the projected maximum reverse current of PV power generation, the maximum permissible current of this line, the reliability coefficient of the current overcurrent stage I setting to avoid the first tripping switch, and the sensitivity coefficient of the current overcurrent stage III setting, the target adaptability of the current overcurrent setting is determined, including: Based on the current capacity of the external photovoltaic booster, the projected capacity of the external photovoltaic booster, the allowable protection capacity of the external photovoltaic booster, and the reliability coefficient of the current overcurrent stage I setting to avoid the first tripping switch, determine the first adaptability of the current overcurrent stage I setting. And / or, based on the current capacity of the line, the projected capacity of the line, the photovoltaic insurance capacity allowed by the set value, the current maximum reverse current of the photovoltaic system, the projected maximum reverse current of the photovoltaic system, the maximum allowable current of the line, and the sensitivity coefficient of the current overcurrent stage III set value, determine the second adaptability of the current overcurrent stage III set value.

3. The method according to claim 2, characterized in that, Based on the current capacity of the external photovoltaic booster, the projected capacity of the external photovoltaic booster, the allowable backup capacity of the external photovoltaic booster, and the reliability coefficient of the current overcurrent stage I setting to avoid the first tripping switch, the first adaptability of the current overcurrent stage I setting is determined, including: Based on the reliability coefficient of the first tripable switch of the current overcurrent stage I setting, determine the first sub-adaptability of the current overcurrent stage I setting without considering photovoltaics; Based on the current capacity of external photovoltaic power generation and the set value that allows the external photovoltaic power generation insurance capacity of this line, determine the second sub-adaptability of the current overcurrent stage I set value; Based on the projected capacity of external photovoltaic power generation on this line and the set value that allows for the insurance capacity of external photovoltaic power generation on this line, determine the third sub-adaptability of the current overcurrent stage I set value; The first adaptability of the current overcurrent stage I setting is determined based on the first sub-adaptability, the second sub-adaptability, and the third sub-adaptability.

4. The method according to claim 3, characterized in that, The target risk level of the current overcurrent setting is determined based on the target adaptability and preset evaluation criteria, including: If the first adaptation is adapted to the first sub-adaptation and the second sub-adaptation is not adapted, then the first risk level is determined to be a red alert; If the first adaptability is not adapted to the first sub-adaptability, then the first risk level is determined to be an orange alert; If the first adaptation is adapted to the second sub-adaptation and the third sub-adaptation is not adapted, then the first risk level is determined to be a yellow warning. If the first adaptation is the third sub-adaptive adaptation, then the first risk level is determined to be a blue warning.

5. The method according to claim 2, characterized in that, Based on the current capacity of this line, the projected capacity of this line, the photovoltaic insurance capacity allowed by the set value, the current maximum reverse current of the photovoltaic system, the projected maximum reverse current of the photovoltaic system, the maximum allowable current of this line, and the sensitivity coefficient of the current overcurrent stage III set value, determine the target adaptability of the current overcurrent set value, including: Based on the sensitivity coefficient of the current overcurrent stage III setting, determine the fourth sub-adaptability of the current overcurrent stage III setting without considering photovoltaics; Based on the current capacity of this line, the photovoltaic insurance capacity allowed by the set value of this line, the current maximum reverse current of the photovoltaic system, and the maximum allowable current of this line, determine the fifth sub-adaptability of the current overcurrent stage III set value; Based on the projected capacity of this line, the photovoltaic insurance capacity allowed by the set value of this line, the maximum reverse current of the projected photovoltaic system, and the maximum allowable current of this line, determine the sixth sub-adaptability of the current overcurrent stage III setting; Based on the fourth sub-adaptability, the fifth sub-adaptability, and the sixth sub-adaptability, the second adaptability of the current overcurrent stage III setting is determined.

6. The method according to claim 5, characterized in that, The target risk level of the current overcurrent setting is determined based on the target adaptability and preset evaluation criteria, including: If the second adaptation is adapted to the fourth sub-adaptation and the fifth sub-adaptation is not adapted, then the second risk level is determined to be a red alert. If the second adaptability is not adapted to the fourth sub-adaptability, then the second risk level is determined to be an orange alert; If the second adaptation is adapted to the fifth sub-adaptation and the sixth sub-adaptation is not adapted, then the second risk level is determined to be a yellow warning. If the second adaptation is the sixth sub-adaptive adaptation, then the second risk level is determined to be a blue warning.

7. The method according to claim 1, characterized in that, Based on the first electrical parameter and the second electrical parameter, the current capacity of the external photovoltaic booster for this line is determined, including: Based on the current capacity of the entire station and the current capacity of this line, determine the current capacity of external photovoltaic boosting for this line.

8. The method according to claim 1, characterized in that, Based on the first electrical parameters and the second electrical parameters, the projected capacity of external photovoltaic power generation for this line is determined, including: Based on the projected capacity of the entire station and the projected capacity of this line, the projected capacity of photovoltaic power generation outside this line is determined.

9. The method according to claim 1, characterized in that, Based on the first electrical parameter and the second electrical parameter, determine the set value of the external photovoltaic-assisted insurance capacity allowed for this line, including: Based on the current overcurrent setting, the large-mode system impedance, and the impedance from the outgoing line to the first tripable switch, determine the reliability coefficient of the current overcurrent stage I setting relative to the first tripable switch; Based on the reliability coefficient and the large-mode system impedance, determine the set value for the external photovoltaic-assisted insurance capacity of this line.

10. The method according to claim 1, characterized in that, Based on the first electrical parameter and the second electrical parameter, the set value of the photovoltaic insurable capacity of this line is determined, including: The sensitivity coefficient of the current overcurrent stage III setting is determined based on the current overcurrent setting, the small-mode system impedance, and the longest path line impedance. Based on the sensitivity coefficient and the longest path line impedance, the set value of the photovoltaic insurance capacity allowed for this line is determined.

11. The method according to claim 1, characterized in that, Determining the current maximum reverse current of the photovoltaic system based on the first electrical parameter and the second electrical parameter includes: Based on the current capacity of this line, determine the current maximum reverse current of the photovoltaic system.

12. The method according to claim 1, characterized in that, Based on the first electrical parameter and the second electrical parameter, the maximum reverse current of the prospective photovoltaic system is determined, including: Based on the projected capacity of this line, determine the maximum reverse current of the projected photovoltaic system.

13. The method according to claim 1, characterized in that, Based on the first electrical parameter, the second electrical parameter, the projected capacity of the external photovoltaic system, the projected capacity of the current line, and the maximum reverse current of the projected photovoltaic system, a suggested value for the current overcurrent setting is determined, including: Based on the proposed photovoltaic capacity of the external photovoltaic booster, the impedance of the large-mode system, and the impedance value from the outgoing line to the first tripable switch, determine the lower limit of the recommended overcurrent stage I setting. Determine the upper limit of the recommended overcurrent stage I setting based on the system impedance described above. Based on the maximum allowable current of this line and the maximum reverse current of the prospective photovoltaic system, determine the recommended lower limit of the overcurrent stage III setting; Based on the projected capacity of this line, the impedance of the small-mode system, and the impedance of the longest path line, the upper limit of the recommended overcurrent stage III setting is determined.

14. A setting adaptability assessment device for an active distribution network, used to implement the setting adaptability assessment method for an active distribution network according to any one of claims 1-13, characterized in that, The device includes: The parameter acquisition module is used to acquire the first electrical parameters of the target substation and the second electrical parameters of the line. The first electrical parameters include the current capacity of the entire substation, the projected capacity of the entire substation, the large-mode system impedance, and the small-mode system impedance. The second electrical parameters include the current capacity of the line, the openable capacity of the line, the maximum allowable current of the line, the impedance value from the outgoing line to the first tripable switch, the impedance of the longest path line, and the current overcurrent stage I setting and the current overcurrent stage III setting. The parameter determination module is used to determine the projected capacity of this line, the current capacity of external photovoltaic boosting of this line, the projected capacity of external photovoltaic boosting of this line, the set value allows the external photovoltaic boosting of this line to have a safety capacity, the set value allows the photovoltaic safety capacity of this line, the current maximum reverse current of photovoltaic, the projected maximum reverse current of photovoltaic, the reliability coefficient of the current overcurrent stage I setting to avoid the first tripping switch, and the sensitivity coefficient of the current overcurrent stage III setting, respectively, based on the first electrical parameter and the second electrical parameter. An adaptability determination module is used to determine the target adaptability of the current overcurrent setting based on the current capacity of the current line, the projected capacity of the current line, the current capacity of the external photovoltaic booster, the projected capacity of the external photovoltaic booster, the set value allows the external photovoltaic booster's safety capacity, the set value allows the photovoltaic safety capacity of the current line, the current maximum reverse current of the photovoltaic system, the projected maximum reverse current of the photovoltaic system, the maximum allowable current of the current line, the reliability coefficient of the current overcurrent stage I setting to avoid the first tripping switch, and the sensitivity coefficient of the current overcurrent stage III setting; wherein, the target adaptability includes at least one of the first adaptability of the current overcurrent stage I setting and the second adaptability of the current overcurrent stage III setting; An adaptive assessment module is used to determine the target risk level of the current overcurrent setting based on the target adaptability and preset assessment criteria, and when the target risk level is higher than the preset level, to determine a suggested value for the current overcurrent setting based on the first electrical parameter, the second electrical parameter, the projected capacity of the external photovoltaic system, the projected capacity of the current line, and the maximum reverse current of the projected photovoltaic system; wherein, the target risk level includes at least one of the first risk level and the second risk level of the current overcurrent setting.

15. An electronic device, characterized in that, The device includes: At least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores a computer program executable by the at least one processor, the computer program being executed by the at least one processor to enable the at least one processor to perform the setpoint adaptability assessment method for an active distribution network as described in any one of claims 1-13.

16. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that cause a processor to execute the setpoint adaptability assessment method for an active distribution network as described in any one of claims 1-13.

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