Method, device and equipment for evaluating constant value adaptability of active power distribution network and medium

Abstract

The invention discloses a constant value adaptability evaluation method and device for an active power distribution network, equipment and a medium. The method comprises the following steps: acquiring a first electrical parameter of a target substation and a second electrical parameter of a line; the method comprises the following steps: respectively determining the distant view capacity of the line, the current photovoltaic increase-assisting capacity outside the line, the distant view capacity of the photovoltaic increase-assisting capacity outside the line, the constant value allowable photovoltaic increase-assisting insurance capacity outside the line, the constant value allowable photovoltaic insurance capacity of the line, the current photovoltaic maximum reverse current and the distant view photovoltaic maximum reverse current; the current over-current I-section fixed value comprises the reliability coefficient of the first tripping switch and the sensitivity coefficient of the current over-current III-section fixed value; and determining the target adaptability of the current over-current constant value on the basis of the parameters, judging the target risk level of the current over-current constant value based on the adaptability, and providing a suggested value of the over-current constant value. According to the technical scheme, the constant value adaptability in the distributed photovoltaic high-permeability power distribution network can be quickly and accurately evaluated, and the safety and reliability of the power distribution network are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power systems, and in particular to a method, device, equipment and medium for evaluating the set value adaptability of an active distribution network. Background Art

[0002] Setting adaptability refers to the adaptability of the protection setting of each relay protection device in the power system under different operating conditions. In the existing scheme, for the stock setting of the distribution network, full modeling is usually used to calculate the setting adaptability of all circuit breakers.

[0003] With the in-depth development of "dual carbon construction", a large number of distributed photovoltaic power sources are connected to the traditional distribution network, and the traditional radiation-type power grid is transformed into a multi-terminal active network, resulting in fault current distribution, reverse fault current, auxiliary increase and external pumping, resulting in the distribution network's stock fixed value adaptability is not strong, and the power supply reliability is reduced. If the traditional fixed value adaptability calculation method is still used, it will lead to excessive workload, requiring a lot of manpower and time, and low efficiency.

[0004] Therefore, how to provide a technical solution that can quickly and accurately evaluate the adaptability of protection settings of distributed photovoltaic high-penetration distribution networks is a technical problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0005] The purpose of the present invention is to provide a method, device, equipment and medium for evaluating the fixed value adaptability of an active distribution network, so as to solve the problems of low efficiency of the fixed value adaptability calculation in a distributed photovoltaic high penetration distribution network. The purpose of the present invention is to quickly and accurately determine the fixed value adaptability in a distributed photovoltaic high penetration distribution network, thereby improving the safety and reliability of the distribution network.

[0006] According to one aspect of the present invention, a method for evaluating the set value adaptability of an active distribution network is provided, the method comprising: obtaining a first electrical parameter of a target substation and a second electrical parameter of the line; wherein the first electrical parameter comprises the current capacity of the entire station, the prospect capacity of the entire 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 open capacity of the line, the maximum allowable current of the line, the impedance value of the outgoing line to the first tripping switch, the longest path line impedance, the current overcurrent I section set value and the current overcurrent III section set value; according to the first electrical parameter and the second electrical parameter, respectively determine the prospect capacity of the line, the current capacity of photovoltaic assistance outside the line, the prospect capacity of photovoltaic assistance outside the line, the set value allowed photovoltaic assistance insurance capacity outside the line, the set value allowed photovoltaic insurance capacity of the line, the current photovoltaic maximum reverse current, the prospect photovoltaic maximum reverse current, the reliability coefficient of the current overcurrent I section set value to avoid the first tripping switch and the sensitivity coefficient of the current overcurrent III section set value; according to the current capacity of the line, the prospect capacity of the line, the current capacity of photovoltaic assistance outside the line, the reliability coefficient of the current overcurrent I section set value to avoid the first tripping switch and the sensitivity coefficient of the current overcurrent III section set value The target adaptability of the current overcurrent setting is determined based on the first electrical parameter, the prospect capacity of the photovoltaic power generation outside the line, the photovoltaic power generation insurance capacity allowed by the set value, the photovoltaic insurance capacity allowed by the set value, the current maximum photovoltaic reverse current, the prospect photovoltaic maximum reverse current, the maximum allowable current of the line, the reliability coefficient of the first tripping switch of the current overcurrent section I setting and the sensitivity coefficient of the current overcurrent section III setting; wherein the target adaptability includes at least one of the first adaptability of the current overcurrent section I setting and the second adaptability of the current overcurrent section III setting; the target risk level of the current overcurrent setting is determined according to the target adaptability and the preset evaluation standard, and when the target risk level is higher than the preset level, the recommended value of the current overcurrent setting is determined according to the first electrical parameter, the second electrical parameter, the prospect capacity of the photovoltaic power generation outside the line, the prospect capacity of the line and the prospect photovoltaic maximum reverse current; wherein the target risk level includes at least one of the first risk level of the current overcurrent section I setting and the second risk level.

[0007] Further, according to the current capacity of the line, the prospective capacity of the line, the current capacity of photovoltaic assistance outside the line, the prospective capacity of photovoltaic assistance outside the line, the fixed value allowed photovoltaic assistance insurance capacity outside the line, the fixed value allowed photovoltaic insurance capacity of the line, the current maximum photovoltaic reverse current, the prospective maximum photovoltaic reverse current, the maximum allowable current of the line, the reliability coefficient of the first tripping switch of the current overcurrent section I fixed value and the sensitivity coefficient of the current overcurrent section III fixed value, the target adaptability of the current overcurrent fixed value is determined, including: according to the photovoltaic outside the line The first adaptability of the current overcurrent segment I constant is determined by the current capacity of the current line, the prospective capacity of the photovoltaic power generation outside the line, the photovoltaic power generation insurance capacity outside the line allowed by the constant, and the reliability coefficient of the first tripping switch of the current overcurrent segment I constant; and / or, the second adaptability of the current overcurrent segment III constant is determined according to the current capacity of the line, the prospective capacity of the line, the photovoltaic insurance capacity of the line allowed by the constant, the current maximum photovoltaic reverse current, the prospective maximum photovoltaic reverse current, the maximum allowable current of the line, and the sensitivity coefficient of the current overcurrent segment III constant.

[0008] Furthermore, the first adaptability of the current overcurrent section I constant is determined according to the current photovoltaic-assisted capacity outside the line, the prospective photovoltaic-assisted capacity outside the line, the photovoltaic-assisted insurance capacity outside the line allowed by the constant, and the reliability coefficient of the current overcurrent section I constant to avoid the first trippable switch, including: determining the first sub-adaptability of the current overcurrent section I constant when photovoltaics are not considered according to the reliability coefficient of the current overcurrent section I constant to avoid the first trippable switch; determining the second sub-adaptability of the current overcurrent section I constant according to the current photovoltaic-assisted capacity outside the line and the photovoltaic-assisted insurance capacity outside the line allowed by the constant; determining the third sub-adaptability of the current overcurrent section I constant according to the prospective photovoltaic-assisted capacity outside the line and the photovoltaic-assisted insurance capacity outside the line allowed by the constant; determining the first adaptability of the current overcurrent section I constant according to the first sub-adaptability, the second sub-adaptability and the third sub-adaptability.

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

[0010] Further, according to the current capacity of the line, the prospective capacity of the line, the photovoltaic fuse capacity of the line allowed by the set value, the current maximum photovoltaic reverse current, the prospective maximum photovoltaic reverse current, the maximum allowable current of the line and the sensitivity coefficient of the current overcurrent segment III set value, the target adaptability of the current overcurrent set value is determined, including: according to the sensitivity coefficient of the current overcurrent segment III set value, the fourth sub-adaptability of the current overcurrent segment III set value when photovoltaic is not considered; according to the current capacity of the line, the photovoltaic fuse capacity of the line allowed by the set value, the current maximum photovoltaic reverse current and the maximum allowable current of the line, the fifth sub-adaptability of the current overcurrent segment III set value is determined; according to the prospective capacity of the line, the photovoltaic fuse capacity of the line allowed by the set value, the prospective maximum photovoltaic reverse current and the maximum allowable current of the line, the sixth sub-adaptability of the current overcurrent segment III set value is determined; according to the fourth sub-adaptability, the fifth sub-adaptability and the sixth sub-adaptability of the current overcurrent segment III set value, the second adaptability of the current overcurrent segment III set value is determined.

[0011] Furthermore, the target risk level of the current overcurrent setting is determined according to the target adaptability and preset evaluation criteria, including: if the second adaptability is adapted to the fourth sub-adaptability and the fifth sub-adaptability is not adapted, then the second risk level is determined to be a red warning; if the second adaptability is not adapted to the fourth sub-adaptability, then the second risk level is determined to be an orange warning; if the second adaptability is adapted to the fifth sub-adaptability and the sixth sub-adaptability is not adapted, then the second risk level is determined to be a yellow warning; if the second adaptability is adapted to the third sub-adaptability, then the second risk level is determined to be a blue warning.

[0012] Furthermore, the current photovoltaic boosting capacity outside the line is determined according to the first electrical parameter and the second electrical parameter, including: determining the current photovoltaic boosting capacity outside the line according to the current capacity of the entire station and the current capacity of the line.

[0013] Furthermore, determining the photovoltaic-assisted prospect capacity outside the line according to the first electrical parameter and the second electrical parameter includes: determining the photovoltaic-assisted prospect capacity outside the line according to the whole station prospect capacity and the line prospect capacity.

[0014] Furthermore, based on the first electrical parameter and the second electrical parameter, a fixed value is determined to allow the photovoltaic auxiliary insurance capacity outside the current line, including: based on the current overcurrent fixed value, the large-mode system impedance, and the impedance from the outgoing line to the first trippable switch, a reliability coefficient of the first trippable switch of the current overcurrent fixed value is determined; based on the reliability coefficient and the large-mode system impedance, a fixed value is determined to allow the photovoltaic auxiliary insurance capacity outside the current line.

[0015] Furthermore, based on the first electrical parameter and the second electrical parameter, a constant value allowing the photovoltaic fuse capacity of the line is determined, including: determining a sensitivity coefficient of the current overcurrent constant value based on the current overcurrent constant value, the small-mode system impedance, and the longest path line impedance; and determining a constant value allowing the photovoltaic fuse capacity of the line based on the sensitivity coefficient and the longest path line impedance.

[0016] Further, determining the current maximum photovoltaic reverse current according to the first electrical parameter and the second electrical parameter includes: determining the current maximum photovoltaic reverse current according to the current capacity of the line.

[0017] Further, determining a prospective photovoltaic maximum reverse current according to the first electrical parameter and the second electrical parameter includes: determining a current photovoltaic maximum reverse current according to the prospective capacity of the line.

[0018] Furthermore, 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 prospective photovoltaic maximum reverse current, the recommended value of the current overcurrent constant is determined, including: determining the recommended lower limit of the overcurrent segment I constant according to the prospective photovoltaic capacity outside the line, the large-mode system impedance and the impedance value of the outgoing line to the first trippable switch; determining the recommended upper limit of the overcurrent segment I constant according to the small-mode system impedance; determining the recommended lower limit of the overcurrent segment III constant according to the maximum allowable current of the line and the prospective photovoltaic maximum reverse current; determining the recommended upper limit of the overcurrent segment III constant according to the prospective capacity of the line, the small-mode system impedance and the longest path line impedance.

[0019] According to another aspect of the present invention, a device for evaluating the adaptability of a set value of an active distribution network is provided, the device comprising: a parameter acquisition module, for acquiring a first electrical parameter of a target substation and a second electrical parameter of the line; wherein the first electrical parameter comprises the current capacity of the entire station, the prospective capacity of the entire 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 open capacity of the line, the maximum allowable current of the line, the impedance value from the outgoing line to the first trippable switch, the longest path line impedance, the current overcurrent section I set value and the current overcurrent section III set value. a parameter determination module, for determining the prospect capacity of the line, the current capacity of photovoltaic power generation outside the line, the prospect capacity of photovoltaic power generation outside the line, the fixed value allowed photovoltaic power generation insurance capacity outside the line, the fixed value allowed photovoltaic insurance capacity of the line, the current maximum photovoltaic reverse current, the prospective maximum photovoltaic reverse current, the reliability coefficient of the first tripping switch of the current overcurrent I section fixed value and the sensitivity coefficient of the current overcurrent III section fixed value, respectively, according to the first electrical parameter and the second electrical parameter; an adaptability determination module, for determining the prospect capacity of the line, the current capacity of the line, the prospect capacity of the line, the fixed value allowed photovoltaic power generation insurance capacity outside the line, the fixed value allowed photovoltaic insurance capacity of the line, the current maximum photovoltaic reverse current, the prospective maximum photovoltaic reverse current, the reliability coefficient of the first tripping switch of the current overcurrent I section fixed value and the sensitivity coefficient of the current overcurrent III section fixed value, according to the current capacity of the line, the prospect capacity of the line, the The target adaptability of the current overcurrent setting is determined by the off-road photovoltaic current capacity, the off-line photovoltaic future capacity, the set value allows the off-line photovoltaic insurance capacity, the set value allows the photovoltaic insurance capacity of the line, the current photovoltaic maximum reverse current, the future photovoltaic maximum reverse current, the line maximum allowable current, the reliability coefficient of the first tripping switch of the current overcurrent section I setting and the sensitivity coefficient of the current overcurrent section III setting; wherein the target adaptability includes at least one of the first adaptability of the current overcurrent section I setting and the second adaptability of the current overcurrent section III setting; an adaptability evaluation module is used to determine the target risk level of the current overcurrent setting according to the target adaptability and the preset evaluation standard, and when the target risk level is higher than the preset level, determine the recommended value of the current overcurrent setting according to the first electrical parameter, the second electrical parameter, the off-line photovoltaic future capacity, the future capacity of the line and the future photovoltaic maximum reverse current; wherein the target risk level includes at least one of the first risk level of the current overcurrent section I setting and the second risk level.

[0020] According to another aspect of the present invention, an electronic device is provided, comprising: 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, and the computer program is executed by the at least one processor so that the at least one processor can execute the method for evaluating the adaptability of a set value of an active distribution network as described in any embodiment of the present invention.

[0021] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the method for evaluating the adaptability of an active power distribution network according to any embodiment of the present invention when executed.

[0022] The technical solution provided by the present invention determines the prospect capacity of the line, the current capacity of photovoltaic power generation outside the line, the prospect capacity of photovoltaic power generation outside the line, the fixed value allowed photovoltaic power generation insurance capacity outside the line, the fixed value allowed photovoltaic insurance capacity of the line, the current maximum photovoltaic reverse current, the prospect photovoltaic maximum reverse current, the reliability coefficient of the first tripping switch of the current overcurrent section I fixed value and the sensitivity coefficient of the current overcurrent section III fixed value respectively through the first electrical parameter of the target substation and the second electrical parameter of the line; determines the target adaptability of the current overcurrent fixed value based on the target adaptability, and judges the target risk level of the current overcurrent fixed value based on the target adaptability and provides the recommended value of the overcurrent fixed value. The technical solution can quickly and accurately evaluate the adaptability of the fixed value in the distributed photovoltaic high penetration distribution network, thereby improving the safety and reliability of the distribution network.

[0023] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A flowchart of a method for evaluating the adaptability of a set value of an active distribution network provided in Embodiment 1 of the present invention.

[0025] Figure 2 A schematic diagram of a fixed value adaptability assessment case provided in Example 2 of the present invention.

[0026] Figure 3 A schematic flow chart of a method for evaluating the adaptability of a set value of an active distribution network provided in Embodiment 2 of the present invention.

[0027] Figure 4 A schematic diagram of the structure of a set value adaptability assessment device for an active power distribution network provided in Embodiment 3 of the present invention.

[0028] Figure 5 It is a structural diagram of a device for implementing a method for evaluating the adaptability of a set value of an active distribution network according to an embodiment of the present application. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below through the accompanying drawings and specific embodiments.

[0030] Embodiment 1

[0031] Figure 1 The present invention provides a flowchart of a method for evaluating the fixed value adaptability of an active distribution network according to the first embodiment of the present invention. The present invention can be applied to the evaluation of the fixed value adaptability in a distributed photovoltaic high-penetration distribution network. The method can be executed by a fixed value adaptability evaluation device for an active distribution network. The fixed value adaptability evaluation device for an active distribution network can be implemented in the form of hardware and / or software. The fixed value adaptability evaluation device for an active distribution network can be configured in a device with data processing capabilities. Figure 1 As shown, the method includes the following steps.

[0032] S110, obtaining 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 station, the prospective capacity of the entire station, the large-mode system impedance and the small-mode system impedance, and the second electrical parameters include the current capacity of the line, the open capacity of the line, the maximum allowable current of the line, the impedance value from the outgoing line to the first trippable switch, the longest path line impedance, the current overcurrent section I constant value and the current overcurrent section III constant value.

[0033] Among them, the current capacity of the entire station can be the total distributed photovoltaic capacity under the current actual operating state of the target substation, usually in kilowatts (kW) or megawatts (MW), which is used to indicate the amount of distributed photovoltaic capacity currently connected to the target substation, including the distributed photovoltaic connected capacity and in-transit capacity of the target substation.

[0034] The full-station prospect capacity can be the expected total distributed photovoltaic capacity after the future development of the target substation, that is, the distributed photovoltaic capacity of the target substation calculated in advance, taking into account factors such as the distributed photovoltaic power transmission situation of the target substation and the load of the target substation, including the distributed photovoltaic connected capacity, in-transit capacity and open capacity of the target substation.

[0035] The maximum system impedance can be the equivalent impedance of the entire power system to which the target substation is connected under the maximum operation mode of the power system. The maximum operation mode usually refers to the operation state in which the power capacity put into operation in the system is the largest and the network connection is the closest. The smaller the impedance, the greater the short-circuit current during a fault.

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

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

[0038] The impedance from the outgoing line to the first trippable switch may be a line impedance from the outgoing line switch of the target substation to the first switch capable of performing a tripping operation.

[0039] The current overcurrent setting value can be the setting value of the currently set overcurrent protection. When the current in the line exceeds this setting value, the overcurrent protection device will operate and cut off the fault line. The current overcurrent stage I setting value can be a quick-break protection setting value, which is used to quickly cut off the fault when a serious fault occurs in the system to prevent the fault range from expanding. It can usually be set according to the maximum short-circuit current of the first tripping switch. The current overcurrent stage III setting value can be a protection for protecting the sensitivity of the line. It will operate when the fault range exceeds the overcurrent stage I and overcurrent stage II protection range or the lower-level switch refuses to operate. It can usually be set according to the maximum load current avoided and the sensitivity of the longest path of the line.

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

[0041] The open capacity of this line can be the distributed photovoltaic capacity pre-planned for this line taking into account factors such as the maximum allowable transmission power of this line and the load of this line.

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

[0043] In an embodiment of the present invention, the current capacity of the entire target substation, system impedance and other parameters can be obtained through the substation's monitoring system, automation equipment and related marketing system, power dispatching system. For example, the power system's setting calculation software can be used to analyze the system's operating mode, network structure, equipment parameters and other factors to determine the large-scale system impedance and small-scale system impedance; the current capacity of the line and the future capacity of the line can be obtained from Marketing 2.0 and the "Online State Grid" APP; the longest path line impedance and the impedance from the outgoing line to the first trippable switch can be read directly from the system's database.

[0044] S120. According to the first electrical parameter and the second electrical parameter, respectively determine the future capacity of the line, the current capacity of photovoltaic assistance outside the line, the future capacity of photovoltaic assistance outside the line, the fixed value allowed photovoltaic assistance insurance capacity outside the line, the fixed value allowed photovoltaic insurance capacity of the line, the current maximum photovoltaic reverse current, the future maximum photovoltaic reverse current, the reliability coefficient of the first tripping switch of the current overcurrent section I fixed value and the sensitivity coefficient of the current overcurrent section III fixed value.

[0045] Among them, the prospect capacity of this line can be the expected capacity after the future development of this line, which can be the sum of the connected capacity, in-transit capacity and open capacity of this line. The current capacity of photovoltaic boost outside this line can be the capacity corresponding to the boost current generated by the photovoltaic power source outside this line to the switch of this line at the current moment. The photovoltaic power source outside this line of the target substation may inject additional current into this line during operation, thereby increasing the load capacity of this line. The capacity corresponding to this additional current is the current capacity of photovoltaic boost outside this line.

[0046] Optionally, determining the current photovoltaic boost capacity outside the line according to the first electrical parameter and the second electrical parameter includes: determining the current photovoltaic boost capacity outside the line according to the current capacity of the entire station and the current capacity of the line.

[0047] Specifically, the capacity obtained by subtracting the current capacity of the line from the current capacity of the entire station can be used as the current capacity of the photovoltaic power generation outside the line.

[0048] The prospective capacity of photovoltaic power generation outside this line can be the expected capacity corresponding to the auxiliary current of this line determined by the current capacity and open capacity of this substation and this line.

[0049] Optionally, determining the photovoltaic-assisted prospect capacity outside the current line according to the first electrical parameter and the second electrical parameter includes: determining the photovoltaic-assisted prospect capacity outside the current line according to the full-station prospect capacity and the current line prospect capacity.

[0050] Specifically, the capacity obtained by deducting the prospective capacity of this line from the prospective capacity of the entire station can be used as the prospective capacity of photovoltaic power generation outside this line.

[0051] The fixed value allows the photovoltaic boost insurance capacity outside the line to be the maximum capacity of the boost current generated by the photovoltaic power source outside the line to the line according to the fixed value setting of the protection device and the requirements for safe operation of the system. If the capacity is exceeded, the protection device will malfunction.

[0052] Optionally, a constant value is determined based on the first electrical parameter and the second electrical parameter to allow the photovoltaic auxiliary insurance capacity outside the line, including: determining the reliability coefficient of the current overcurrent section I constant to avoid the first trippable switch based on the current overcurrent constant, the large-mode system impedance, and the impedance from the outgoing line to the first trippable switch; and determining a constant value to allow the photovoltaic auxiliary insurance capacity outside the line based on the reliability coefficient and the large-mode system impedance.

[0053] Specifically, the fault current flowing through the first trip switch in the event of a fault can be determined based on the impedance of the large-scale system and the impedance value of the outgoing line to the first trip switch; the reliability coefficient of the current overcurrent I stage setting to avoid the first trip switch can be determined based on the ratio of the current overcurrent setting to the fault current. Then, the setting is determined based on the reliability coefficient and the impedance of the large-scale system to allow the photovoltaic auxiliary insurance capacity outside the line to be increased.

[0054] The fixed value allows the photovoltaic fuse capacity of this line to be the maximum capacity of the external current generated by the photovoltaic power source of this line on this line according to the fixed value setting of the protection device and the requirements of the safe operation of the system. If the capacity is exceeded, the protection device will refuse to operate.

[0055] Optionally, a constant value allowing the photovoltaic fuse capacity of the line is determined based on the first electrical parameter and the second electrical parameter, including: determining the sensitivity coefficient of the current overcurrent section III constant based on the current overcurrent constant, the small-mode system impedance, and the longest path line impedance; determining a constant value allowing the photovoltaic fuse capacity of the line based on the sensitivity coefficient and the longest path line impedance.

[0056] Specifically, the minimum short-circuit current flowing through the installation point of the protection device when a fault occurs under the minimum operating mode can be determined based on the minimum system impedance and the longest path line impedance; the ratio of the minimum short-circuit current to the current overcurrent setting is determined as the sensitivity coefficient; and then the set value allowable photovoltaic insurance capacity of this line is determined based on the sensitivity coefficient and the longest path line impedance.

[0057] The current maximum photovoltaic reverse current may be the maximum reverse current that the photovoltaic power source of the line may generate when a fault occurs outside the line under the current photovoltaic capacity. Optionally, determining the current maximum photovoltaic reverse current according to the first electrical parameter and the second electrical parameter includes: determining the current maximum photovoltaic reverse current according to the current capacity of the line.

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

[0059] The maximum reverse current of Envision PV can be the maximum reverse current that the PV power source of this line may generate when a fault occurs outside this line under the capacity of Envision PV.

[0060] Optionally, determining the maximum reverse current of the prospect photovoltaic system according to the first electrical parameter and the second electrical parameter includes: determining the maximum reverse current of the prospect photovoltaic system according to the prospect capacity of the line.

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

[0062] The beneficial effect of the above technical solution is that it can improve the accuracy of determining each parameter, thereby improving the accuracy of the set value adaptability.

[0063] S130. Determine the target adaptability of the current overcurrent setting according to the current capacity of the line, the prospective capacity of the line, the current photovoltaic-assisted capacity outside the line, the prospective photovoltaic-assisted capacity outside the line, the photovoltaic-assisted insurance capacity outside the line allowed by the set value, the photovoltaic insurance capacity of the line allowed by the set value, the current maximum photovoltaic reverse current, the prospective maximum photovoltaic reverse current, the reliability coefficient of the first tripping switch of the current overcurrent section I setting and the sensitivity coefficient of the current overcurrent section III setting; wherein the target adaptability includes at least one of the first adaptability of the current overcurrent section I setting and the second adaptability of the current overcurrent section III setting.

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

[0065] Specifically, whether the current overcurrent setting has sufficient photovoltaic capacity margin in the current state can be determined based on the current capacity of the line, the current photovoltaic auxiliary capacity outside the line, the fixed value allowed photovoltaic auxiliary insurance capacity outside the line, the fixed value allowed photovoltaic insurance capacity of the line and the current maximum photovoltaic reverse current; whether the overcurrent setting has sufficient photovoltaic capacity margin in the future state can be determined based on the future capacity of the line, the future photovoltaic auxiliary capacity outside the line, the fixed value allowed photovoltaic auxiliary insurance capacity outside the line, the fixed value allowed photovoltaic insurance capacity of the line and the future maximum photovoltaic reverse current; and then the target adaptability of the current overcurrent setting can be determined based on the above judgment results.

[0066] S140. Determine the target risk level of the current overcurrent setting according to the target adaptability and the preset evaluation criteria, and determine the recommended value of the current overcurrent setting 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 prospective photovoltaic maximum reverse current when the target risk level is higher than the preset level; wherein the target risk level includes the first risk level of the current overcurrent stage I setting and at least one of the second risk levels.

[0067] Among them, the preset level may be that recommended values ​​are required for red warning, orange warning and yellow warning, or that recommended values ​​are only issued for red warning and orange warning.

[0068] The target risk level can be used to indicate the rationality of the current overcurrent setting. For example, the low risk level may be that the overcurrent setting is set reasonably, so that the overcurrent protection has sufficient margin in normal operation and common fault conditions, and can ensure the selectivity and sensitivity of the protection; the medium risk level may be that there are certain risks in certain specific situations. For example, when the system operation mode changes greatly, the overcurrent setting may not be accurate enough, resulting in an increased probability of false operation or refusal of protection. The overcurrent setting needs to be monitored and adjusted regularly to ensure its effectiveness under different operating conditions; the high risk level may be that the overcurrent setting is set unreasonably, and there is a greater risk, which may cause false operation or refusal of overcurrent protection, affecting the safe and stable operation of the power system or the reliability of power supply. The overcurrent setting needs to be re-evaluated and adjusted immediately to avoid major accidents.

[0069] In the embodiment of the present invention, the adaptability of the current overcurrent setting value may be graded according to a preset evaluation standard, and a target risk level corresponding to the adaptability of the current overcurrent setting value may be determined.

[0070] When the target risk level is higher than the preset level, it indicates that the adaptability of the current overcurrent setting is not strong and the power supply reliability is low. Therefore, the present invention determines the recommended value of the current overcurrent setting according to the first electrical parameter, the second electrical parameter, the prospective capacity of photovoltaic auxiliary increase outside the line, the prospective capacity of the line and the prospective photovoltaic maximum reverse current.

[0071] Specifically, the recommended overcurrent setting value can be calculated using the overcurrent protection setting formula according to the first electrical parameter, the second electrical parameter, the prospective capacity of photovoltaic power generation outside the line, the prospective capacity of the line, and the prospective maximum photovoltaic reverse current, such as system impedance, line capacity, etc. For example, the overcurrent setting value can be determined according to the minimum fault current and protection sensitivity requirements.

[0072] Optionally, the recommended value of the current overcurrent constant is determined based on the first electrical parameter, the second electrical parameter, the prospective photovoltaic capacity outside the line, the prospective capacity of the line and the prospective photovoltaic maximum reverse current, including: determining the recommended lower limit of the overcurrent segment I constant based on the prospective photovoltaic capacity outside the line, the large-mode system impedance and the impedance value of the outgoing line to the first trippable switch; determining the recommended upper limit of the overcurrent segment I constant based on the small-mode system impedance; determining the recommended lower limit of the overcurrent segment III constant based on the maximum allowable current of the line and the prospective photovoltaic maximum reverse current; determining the recommended upper limit of the overcurrent segment III constant based on the prospective capacity of the line, the small-mode system impedance and the longest path line impedance.

[0073] For the recommended lower limit of the overcurrent stage I constant, the total impedance from the power supply to the first trippable switch under the maximum operating mode can be calculated based on the impedance of the large-mode system and the impedance value of the outgoing line to the first trippable switch; then the photovoltaic booster capacity outside the line is considered. When a fault occurs, the photovoltaic booster current will be superimposed on the fault current; finally, in order to ensure that the overcurrent stage I protection can reliably avoid the first trippable switch in this case, it is necessary to determine a reliable large current value based on the total impedance and booster capacity as the recommended lower limit of the overcurrent stage I constant.

[0074] For the upper limit of the recommended overcurrent stage I setting, since the short-circuit current of the system is relatively small under the minimum operation mode, in order to ensure the reliable operation of the overcurrent stage I protection when the outlet fails during a two-phase short circuit, the system voltage and the minimum mode system impedance ratio can be set to times as the recommended upper limit of overcurrent stage I setting.

[0075] For the lower limit of the recommended overcurrent stage III setting, due to the existence of the reverse current of Envision PV, when determining the lower limit of the recommended overcurrent stage III setting, it is necessary to consider the impact of the maximum reverse current of Envision PV on the protection. If the maximum reverse current of Envision PV is large, it may cause the overcurrent stage III protection to malfunction. Therefore, the larger value of 1.33 times the maximum allowable current of this line and the maximum reverse current of Envision PV can be used as the lower limit of the recommended overcurrent stage III setting.

[0076] For the recommended upper limit of the overcurrent stage III, the minimum short-circuit current that may occur when a two-phase short circuit occurs at the end of the line can be calculated based on the future capacity of the line, the impedance of the small-mode system and the impedance of the longest path line, and divided by 1.3 as the recommended upper limit of the overcurrent stage III.

[0077] For example, the recommended constant optimization values ​​can be automatically calculated for distribution lines whose risk levels meet preset levels, so as to improve the pertinence and convenience of on-site rectification work. Figure 2 A schematic diagram of a fixed value adaptability evaluation case provided in the first embodiment of the present invention is shown in FIG. Figure 2As shown in the figure, the set value adaptability risk level assessment is performed on the 10 distribution lines in the figure, and the set value optimization recommendation values ​​are calculated for the distribution lines with red and yellow warnings.

[0078] The embodiment of the present invention provides a method for evaluating the adaptability of a set value of an active distribution network. The method obtains the first electrical parameter of the target substation and the second electrical parameter of the line to respectively determine the prospect capacity of the line, the current capacity of photovoltaic assistance outside the line, the prospect capacity of photovoltaic assistance outside the line, the photovoltaic assistance insurance capacity allowed by the set value outside the line, the photovoltaic insurance capacity allowed by the set value of the line, the current maximum photovoltaic reverse current and the prospective maximum photovoltaic reverse current; determine the target adaptability of the current overcurrent set value based on the above parameters; and judge the target risk level of the current overcurrent set value based on the adaptability and provide a recommended value for the overcurrent set value. The technical solution can quickly and accurately evaluate the adaptability of the set value in a distributed photovoltaic high-penetration distribution network, thereby improving the safety and reliability of the distribution network.

[0079] Embodiment 2

[0080] Figure 3 The following is a flow chart of a method for evaluating the adaptability of a set value of an active power distribution network provided in the second embodiment of the present invention. The embodiment of the present invention is optimized based on the above embodiment. Figure 3 As shown, the method includes the following steps.

[0081] S210, obtaining 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 station, the prospective capacity of the entire station, the large-mode system impedance and the small-mode system impedance, and the second electrical parameters include the current capacity of the line, the open capacity of the line, the maximum allowable current of the line, the impedance value from the outgoing line to the first trippable switch, the longest path line impedance, the current overcurrent section I constant value and the current overcurrent section III constant value.

[0082] S220. According to the first electrical parameter and the second electrical parameter, respectively determine the future capacity of the line, the current capacity of photovoltaic assistance outside the line, the future capacity of photovoltaic assistance outside the line, the fixed value allowed photovoltaic assistance insurance capacity outside the line, the fixed value allowed photovoltaic insurance capacity of the line, the current maximum photovoltaic reverse current, the future maximum photovoltaic reverse current, the reliability coefficient of the first tripping switch of the current overcurrent section I fixed value and the sensitivity coefficient of the current overcurrent section III fixed value.

[0083] S230, determining the first adaptability of the current overcurrent section I constant according to the current capacity of the photovoltaic power generation outside the line, the prospective capacity of the photovoltaic power generation outside the line, the reliability coefficient of the photovoltaic power generation insurance capacity outside the line allowed by the constant and the first trippable switch of the current overcurrent section I constant.

[0084] When the target substation outgoing switch is equipped with three-stage current protection, the auxiliary increase phenomenon caused by access to photovoltaics will expand the protection range and cause over-level tripping. In addition to the outgoing line section I protection, the outgoing line section II and branch switch protection can ensure selectivity through time and coordination with the lower-level protection. The boundary switch protection is allowed to lose selectivity in the setting principle; the external absorption phenomenon caused by access to photovoltaics will reduce the overcurrent section III protection range and cause protection refusal to operate. Moreover, the longer the protected line and the larger the photovoltaic capacity, the easier it is to lose sensitivity in the event of a terminal fault. Therefore, when calculating the distribution network setting, we can focus on the adaptability of the protection setting values ​​of the outgoing line section I, section III and the large branch section III.

[0085] For the outgoing line overcurrent stage I, affected by the fault type and fault location, in most cases, the short-circuit current provided by the system side is mainly reactive current. If the fault point is at the rear end of the line, the photovoltaic power generation on the same bus does not enter the low-through control link, and the photovoltaic power generation mainly outputs active current. At this time, the auxiliary increase phenomenon is not obvious; if the fault point is close to the bus side, the photovoltaic power generation on the same bus enters a deep low-through state, and the output reactive current is large. At this time, the auxiliary increase phenomenon is more obvious. In extreme cases, the short-circuit current provided by the photovoltaic side is in phase with the short-circuit current provided by the system side, ensuring the selectivity of the outgoing line switch overcurrent stage I. Specifically, the overcurrent stage I can be verified by the following formula.

[0086] After simplification, we can get

[0087] In the formula, Represents the system phase voltage, Z s.min represents the large-scale system impedance, Z L1 Indicates the impedance from the outgoing line to the first trippable switch, I PV Indicates the maximum short-circuit current provided by the photovoltaic before the protection installation, generally considered as 1.2 times the rated current, k rel Indicates the reliability coefficient of the current operating constant.

[0088] Optionally, the first adaptability of the current overcurrent section I constant is determined according to the current capacity of photovoltaic assistance outside the line, the prospective capacity of photovoltaic assistance outside the line, the photovoltaic assistance insurance capacity allowed by the constant value, and the reliability coefficient of the current overcurrent section I constant to avoid the first trippable switch, including: determining the first sub-adaptability of the current overcurrent section I constant when photovoltaics are not considered according to the reliability coefficient of the current overcurrent section I constant to avoid the first trippable switch; determining the second sub-adaptability of the current overcurrent section I constant according to the current capacity of photovoltaic assistance outside the line and the photovoltaic assistance insurance capacity allowed by the constant value; determining the third sub-adaptability of the current overcurrent section I constant according to the prospective capacity of photovoltaic assistance outside the line and the photovoltaic assistance insurance capacity allowed by the constant value; determining the first adaptability of the current overcurrent section I constant according to the first sub-adaptability, the second sub-adaptability and the third sub-adaptability.

[0089] Specifically, the reliability coefficient of the current overcurrent section I constant avoiding the first tripping switch can be compared with the preset threshold value to determine the first sub-adaptability of the current overcurrent section I constant when photovoltaics are not considered. For example, if the reliability coefficient is less than 1.3, it is determined that the first sub-adaptability of the current overcurrent section I constant when photovoltaics are not considered is not adapted; further, the current photovoltaic auxiliary capacity outside the line and the photovoltaic auxiliary insurance capacity allowed by the constant outside the line can be compared to determine whether the current overcurrent section I constant is adapted to the current capacity of the line; the prospective photovoltaic auxiliary capacity outside the line and the photovoltaic insurance capacity allowed by the constant on the line can be compared to determine whether the current overcurrent section I constant is adapted to the prospective capacity of the line; finally, according to the above three sub-adaptability determination results, the first adaptability of the current overcurrent section I constant is determined.

[0090] S240, determining the second adaptability of the current overcurrent segment III constant according to the current capacity of the line, the prospective capacity of the line, the photovoltaic fuse capacity of the line allowed by the constant, the current maximum photovoltaic reverse current, the prospective maximum photovoltaic reverse current, the maximum allowable current of the line and the sensitivity coefficient of the current overcurrent segment III constant.

[0091] For overcurrent section III and large branch section III, affected by the fault type and fault location, in most cases, the short-circuit current provided by the system side is mainly reactive current. If the fault point is far away from the distributed photovoltaic, the photovoltaic has not entered the low-breakthrough control link, and the photovoltaic mainly outputs active current. At this time, the external draw phenomenon is not obvious; if the fault point is close to the distributed photovoltaic, the photovoltaic enters a deep low-breakthrough state, and the photovoltaic output reactive current is large. At this time, the external draw phenomenon is more obvious. In extreme cases, the short-circuit current provided by the photovoltaic side is in phase with the short-circuit current provided by the system side to ensure the sensitivity when a short circuit occurs at the end of the line under the minimum operating mode. Specifically, the overcurrent section III and large branch section III can be verified by the following formula.

[0092] After simplification, we can get

[0093] In the formula, Represents the system phase voltage, Z L1 represents the longest path line impedance, I PV Indicates the maximum short-circuit current provided by the photovoltaic after the protection installation, generally considered as 1.2 times the rated current, k sen Indicates the current operating set value sensitivity coefficient, Z s.max Indicates the small mode system impedance. When evaluating the branch switch, Z s.max It is the sum of the small-mode system impedance and the line impedance from the protection installation to the busbar.

[0094] Optionally, the second adaptability of the current overcurrent segment III constant is determined according to the current capacity of the line, the prospective capacity of the line, the photovoltaic fuse capacity of the line allowed by the set value, the current maximum photovoltaic reverse current, the prospective maximum photovoltaic reverse current, the maximum allowable current of the line and the sensitivity coefficient of the current overcurrent segment III constant, including: determining the fourth sub-adaptability of the current overcurrent segment III constant when photovoltaics are not considered according to the sensitivity coefficient of the current overcurrent segment III constant; determining the fifth sub-adaptability of the current overcurrent segment III constant according to the current capacity of the line, the photovoltaic fuse capacity of the line allowed by the set value, the current maximum photovoltaic reverse current and the maximum allowable current of the line; determining the sixth sub-adaptability of the current overcurrent segment III constant according to the prospective capacity of the line, the photovoltaic fuse capacity of the line allowed by the set value, the prospective maximum photovoltaic reverse current and the maximum allowable current of the line; determining the second adaptability of the current overcurrent segment III constant according to the fourth sub-adaptability, the fifth sub-adaptability and the sixth sub-adaptability.

[0095] Specifically, the sensitivity coefficient of the current overcurrent segment III constant can be compared with the preset threshold to determine the first sub-adaptability of the current overcurrent segment III constant when photovoltaics are not considered. For example, if the sensitivity coefficient is less than 1.3, the first sub-adaptability of the current overcurrent segment I constant when photovoltaics are not considered is determined to be inappropriate; the current photovoltaic capacity of this line is compared with the photovoltaic insurance capacity of this line allowed by the constant, and the current maximum photovoltaic reverse current is compared with the maximum allowable current of this line. The two jointly determine whether the current overcurrent segment III constant is adapted to the current capacity of this line. Only when the above two criteria are adapted at the same time, the overcurrent segment III constant is adapted to the current capacity of this line; the prospective capacity of this line is compared with the photovoltaic insurance capacity of this line allowed by the constant, and the prospective maximum photovoltaic reverse current is compared with the maximum allowable current of this line. The two jointly determine whether the current overcurrent segment III constant is adapted to the prospective capacity of this line. Only when the above two criteria are adapted at the same time, the overcurrent segment III constant is adapted to the prospective capacity of this line; and then according to the above three sub-adaptability determination results, the second adaptability of the current overcurrent segment III constant is determined.

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

[0097] S250. Determine the target risk level of the current overcurrent setting according to the target adaptability and the preset evaluation criteria, and determine the recommended value of the overcurrent setting according to the first electrical parameter, the second electrical parameter, the photovoltaic auxiliary capacity outside the line, the prospective capacity of the line and the prospective photovoltaic maximum reverse current when the target risk level is higher than the preset level; wherein the target risk level includes the first risk level of the current overcurrent stage I setting and at least one of the second risk levels.

[0098] Among them, the preset evaluation standards can be divided into the following four types: 1. Red warning, that is, the current operating constant is not suitable for the current grid-connected capacity of photovoltaic power generation, and needs to be evaluated and optimized as soon as possible; 2. Orange warning, that is, when photovoltaic power generation is not considered, the current operating constant is no longer suitable for the current grid-connected capacity of photovoltaic power generation, and needs to be evaluated and optimized as soon as possible; 3. Yellow warning, that is, the current operating constant is suitable for the current grid-connected capacity of photovoltaic power generation, but not for the future grid-connected capacity, and needs to be paid attention to; 4. Blue warning, that is, the current operating constant is suitable for the future grid-connected capacity of photovoltaic power generation, and no optimization is required.

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

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

[0101] The embodiment of the present invention provides a method for evaluating the adaptability of fixed value of an active distribution network, which evaluates the adaptability of the protection fixed value of overcurrent section I, section III and large branch section III respectively, further improving the accuracy of the fixed value adaptability evaluation of the active distribution network in the distributed photovoltaic high penetration distribution network.

[0102] Embodiment 3

[0103] Figure 4 This is a schematic diagram of the structure of a fixed value adaptability evaluation device for an active power distribution network provided in the third embodiment of the present invention. Figure 4 As shown, the device includes the following modules.

[0104] The parameter acquisition module 310 is used to obtain the first electrical parameters of the target substation and the second electrical parameters of the line; wherein the first electrical parameters include the current capacity of the entire station, the prospective capacity of the entire station, the large-mode system impedance and the small-mode system impedance; the second electrical parameters include the current capacity of the line, the open capacity of the line, the maximum allowable current of the line, the impedance value from the outgoing line to the first trippable switch, the longest path line impedance, the current overcurrent section I constant and the current overcurrent section III constant.

[0105] The parameter determination module 320 is used to determine the future capacity of the line, the current capacity of photovoltaic auxiliary increase outside the line, the future capacity of photovoltaic auxiliary increase outside the line, the fixed value allowed photovoltaic auxiliary increase insurance capacity outside the line, the fixed value allowed photovoltaic insurance capacity of the line, the current maximum photovoltaic reverse current, the future maximum photovoltaic reverse current, the reliability coefficient of the first tripping switch of the current overcurrent section I fixed value and the sensitivity coefficient of the current overcurrent section III fixed value according to the first electrical parameter and the second electrical parameter.

[0106] The adaptability determination module 330 is used to determine the target adaptability of the current overcurrent setting according to the current capacity of the line, the prospective capacity of the line, the current photovoltaic-assisted capacity outside the line, the prospective capacity of the photovoltaic-assisted capacity outside the line, the photovoltaic-assisted insurance capacity allowed by the set value, the photovoltaic insurance capacity allowed by the set value, the current maximum photovoltaic reverse current, the prospective maximum photovoltaic reverse current, the maximum allowable current of the line, the reliability coefficient of the first tripping switch of the current overcurrent section I setting and the sensitivity coefficient of the current overcurrent section III setting; wherein the target adaptability includes at least one of the first adaptability of the current overcurrent section I setting and the second adaptability of the current overcurrent section III setting.

[0107] The adaptability assessment module 340 is used to determine the target risk level of the current overcurrent setting according to the target adaptability and the preset assessment standard, and when the target risk level is higher than the preset level, determine the recommended value of the current overcurrent setting according to the first electrical parameter, the second electrical parameter, the photovoltaic auxiliary capacity outside the line, the prospective capacity of the line and the prospective photovoltaic maximum reverse current; wherein the target risk level includes the first risk level of the current overcurrent stage I setting and at least one of the second risk levels.

[0108] The benefit of this arrangement of the scheme is that it can quickly and accurately evaluate the adaptability of set values ​​in distributed photovoltaic high-penetration distribution networks, thereby improving the safety and reliability of the distribution network.

[0109] Furthermore, the adaptability determination module 330 includes: a first adaptability determination unit, which is used to determine the first adaptability of the current overcurrent segment I constant according to the current capacity of the photovoltaic auxiliary increase outside the line, the prospective capacity of the photovoltaic auxiliary increase outside the line, the fixed value allowing the photovoltaic auxiliary increase insurance capacity outside the line and the reliability coefficient of the current overcurrent segment I constant to avoid the first tripping switch; and / or a second adaptability determination unit, which is used to determine the second adaptability of the current overcurrent segment III constant according to the current capacity of the line, the prospective capacity of the line, the fixed value allowing the photovoltaic insurance capacity of the line, the current maximum photovoltaic reverse current, the prospective maximum photovoltaic reverse current, the maximum allowable current of the line and the sensitivity coefficient of the current overcurrent segment III constant.

[0110] Furthermore, the first adaptability determination unit includes: a first sub-adaptability determination sub-unit, which is used to determine the first sub-adaptability of the current overcurrent section I constant when photovoltaics are not considered based on the reliability coefficient of the first trippable switch of the current overcurrent section I constant; a second sub-adaptability determination sub-unit, which is used to determine the second sub-adaptability of the current overcurrent section I constant according to the current photovoltaic assisted capacity outside the line and the photovoltaic assisted insurance capacity outside the line allowed by the constant; a third sub-adaptability determination sub-unit, which is used to determine the third sub-adaptability of the current overcurrent section I constant according to the photovoltaic assisted future capacity outside the line and the photovoltaic assisted insurance capacity outside the line allowed by the constant; the overcurrent section I constant adaptability determination sub-unit, which is used to determine the first adaptability of the current overcurrent section I constant according to the first sub-adaptability, the second sub-adaptability and the third sub-adaptability.

[0111] Furthermore, the adaptability assessment module 340 includes: a first warning unit, used for determining that the first risk level is a red warning if the first adaptability is that the first sub-adaptability is adapted and the second sub-adaptability is not adapted; a second warning unit, used for determining that the first risk level is an orange warning if the first adaptability is that the first sub-adaptability is not adapted; a third warning unit, used for determining that the first risk level is a yellow warning if the first adaptability is that the second sub-adaptability is adapted and the third sub-adaptability is not adapted; and a fourth warning unit, used for determining that the first risk level is a blue warning if the first adaptability is that the third sub-adaptability is adapted.

[0112] Furthermore, the second adaptability determination unit includes: a fourth sub-adaptability determination sub-unit, which is used to determine the fourth sub-adaptability of the current overcurrent segment III constant when photovoltaics are not considered based on the current overcurrent segment III constant sensitivity coefficient; a fifth sub-adaptability determination sub-unit, which is used to determine the fifth sub-adaptability of the current overcurrent segment III constant based on the current capacity of the line, the photovoltaic fuse capacity of the line allowed by the constant, the current maximum photovoltaic reverse current and the maximum allowable current of the line; a sixth sub-adaptability determination sub-unit, which is used to determine the sixth sub-adaptability of the current overcurrent segment III constant based on the prospective capacity of the line, the photovoltaic fuse capacity of the line allowed by the constant, the prospective maximum photovoltaic reverse current and the maximum allowable current of the line; and an overcurrent segment III constant adaptability determination sub-unit, which is used to determine the second adaptability of the current overcurrent segment III constant based on the fourth sub-adaptability, the fifth sub-adaptability and the sixth sub-adaptability.

[0113] Furthermore, the adaptability assessment module 340 includes: a fifth warning unit, used for determining that the second risk level is a red warning if the second adaptability is that the second sub-adaptability is not adapted; a sixth warning unit, used for determining that the second risk level is an orange warning if the second adaptability is that the fourth sub-adaptability is not adapted; a seventh warning unit, used for determining that the second risk level is a yellow warning if the second adaptability is that the second sub-adaptability is adapted and the third sub-adaptability is not adapted; and an eighth warning unit, used for determining that the second risk level is a blue warning if the second adaptability is that the third sub-adaptability is adapted.

[0114] Furthermore, the parameter determination module 320 includes: a current capacity determination unit for photovoltaic power generation outside the line, which is used to determine the current capacity of photovoltaic power generation outside the line according to the current capacity of the entire station and the current capacity of the line.

[0115] Furthermore, the parameter determination module 320 includes: a photovoltaic augmentation prospect capacity determination unit outside the line, which is used to determine the photovoltaic augmentation prospect capacity outside the line according to the whole station prospect capacity and the line prospect capacity.

[0116] Furthermore, the parameter determination module 320 includes: a reliability coefficient determination unit, which is used to determine the reliability coefficient of the first trippable switch of the current overcurrent set value according to the current overcurrent set value, the large-mode system impedance, and the impedance of the outgoing line to the first trippable switch; a set value allowed photovoltaic auxiliary insurance capacity determination unit outside the line, which is used to determine the set value allowed photovoltaic auxiliary insurance capacity outside the line according to the reliability coefficient and the large-mode system impedance.

[0117] Furthermore, the parameter determination module 320 includes: a sensitivity coefficient determination unit, which is used to determine the sensitivity coefficient of the current overcurrent set value according to the current overcurrent set value, the small mode system impedance, and the longest path line impedance; a set value allowed photovoltaic insurance capacity determination unit for this line, which is used to determine the set value allowed photovoltaic insurance capacity of this line according to the sensitivity coefficient and the longest path line impedance.

[0118] Furthermore, the parameter determination module 320 includes: a current photovoltaic maximum reverse current determination unit, which is used to determine the current photovoltaic maximum reverse current according to the current capacity of the line.

[0119] Furthermore, the parameter determination module 320 includes: a prospect photovoltaic maximum reverse current determination unit, which is used to determine the prospect photovoltaic maximum reverse current according to the prospect capacity of the line.

[0120] Furthermore, the adaptability evaluation module 340 includes: a first recommended value determination unit, which is used to determine the recommended lower limit of the overcurrent I stage constant according to the photovoltaic auxiliary capacity outside the line, the large-mode system impedance and the impedance value of the outgoing line to the first trippable switch; a second recommended value determination unit, which is used to determine the recommended upper limit of the overcurrent I stage constant according to the small-mode system impedance; a third recommended value determination unit, which is used to determine the recommended lower limit of the overcurrent III stage constant according to the maximum allowable current of the line and the maximum reverse current of the future photovoltaic; and a fourth recommended value determination unit, which is used to determine the recommended upper limit of the overcurrent III stage constant according to the future capacity of the line, the small-mode system impedance and the longest path line impedance.

[0121] The set value adaptability assessment device for the active power distribution network in the embodiment of the present invention 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. Exemplarily, the mobile electronic device can be a mobile phone, a tablet computer, a laptop computer, a PDA, an in-vehicle electronic device, a wearable device, an ultra-mobile personal computer (UMPC), a netbook, or a personal digital assistant (PDA), etc. 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., which is not specifically limited in the embodiment of the present application.

[0122] The set value adaptability assessment device for an active power distribution network in the embodiment of the present invention may be a device having an operating system. The operating system may be an Android operating system, an iOS operating system, or other possible operating systems, which are not specifically limited in the embodiment of the present application.

[0123] The set value adaptability assessment device for an active power distribution network provided in an embodiment of the present invention can implement each process implemented in the above method embodiment, and has the corresponding functional modules and beneficial effects of the execution method.

[0124] Embodiment 4

[0125] Figure 5 A schematic diagram of a device 10 that can be used to implement an embodiment of the present application is shown. The device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workbenches, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The device can also represent various forms of mobile devices, such as personal digital assistants, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present application described and / or required herein.

[0126] like Figure 5 As shown, the device 10 includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and 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 to 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, ROM 12 and 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 number 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 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 telecommunication networks.

[0128] The processor 11 may be a variety of general and / or special processing components with 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 dedicated artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as a method for evaluating the adaptability of a set value of an active distribution network.

[0129] In some embodiments, the set value adaptability assessment method for an active power distribution network may be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 18. In some embodiments, part or all of the computer program may be loaded and / or installed on the device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the set value adaptability assessment method for an active power distribution network described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to execute the set value adaptability assessment method for an active power distribution network in any other appropriate manner (e.g., by means of firmware).

[0130] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0131] The computer programs for implementing the methods of the present application may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer programs are executed by the processor, the functions / operations specified in the flow charts and / or block diagrams are implemented. The computer programs may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0132] In the context of the present application, a computer readable storage medium may be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, device or equipment. A computer readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer readable storage medium may be a machine readable signal medium. A more specific example of a machine readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, 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 disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0133] To provide interaction with a user, the systems and techniques described herein can be implemented on a device having: a display device (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 trackball) through which the user can provide input to the device. Other types of devices can also be used to provide interaction with the user; for example, the 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 input, voice input, or tactile input).

[0134] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may 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), a blockchain network, and the Internet.

[0135] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may 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 difficult management and weak business scalability in traditional physical hosts and VPS servers.

[0136] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this application can be executed in parallel, sequentially or in different orders, as long as the expected results of the technical solution of this application can be achieved, and this document is not limited here.

[0137] The above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A method for evaluating the adaptability of a fixed value of an active distribution network, characterized in that: The method comprises: Obtain the first electrical parameters of the target substation and the second electrical parameters of the line; wherein the first electrical parameters include the current capacity of the entire station, the prospective capacity of the entire station, the large-mode system impedance and the small-mode system impedance; the second electrical parameters include the current capacity of the line, the open capacity of the line, the maximum allowable current of the line, the impedance value from the outgoing line to the first trippable switch, the longest path line impedance, the current overcurrent section I constant value and the current overcurrent section III constant value; According to the first electrical parameter and the second electrical parameter, respectively determine the future capacity of the line, the current capacity of photovoltaic power generation outside the line, the future capacity of photovoltaic power generation outside the line, the fixed value allowed for the photovoltaic power generation insurance capacity outside the line, the fixed value allowed for the photovoltaic insurance capacity of the line, the current maximum photovoltaic reverse current, the future maximum photovoltaic reverse current, the reliability coefficient of the first tripping switch of the current overcurrent section I fixed value, and the sensitivity coefficient of the current overcurrent section III fixed value; According to the current capacity of the line, the prospective capacity of the line, the current capacity of photovoltaic assistance outside the line, the prospective capacity of photovoltaic assistance outside the line, the photovoltaic assistance insurance capacity outside the line allowed by the set value, the photovoltaic insurance capacity of the line allowed by the set value, the current maximum photovoltaic reverse current, the prospective maximum photovoltaic reverse current, the maximum allowable current of the line, the reliability coefficient of the first tripping switch of the current overcurrent section I set value and the sensitivity coefficient of the current overcurrent section III set value, determine the target adaptability of the current overcurrent set value; wherein, the target adaptability includes at least one of the first adaptability of the current overcurrent section I set value and the second adaptability of the current overcurrent section III set value; The target risk level of the current overcurrent setting is determined according to the target adaptability and the preset evaluation criteria, and when the target risk level is higher than the preset level, the recommended value of the current overcurrent setting is determined according to the first electrical parameter, the second electrical parameter, the photovoltaic auxiliary capacity outside the line, the prospective capacity of the line and the prospective photovoltaic maximum reverse current; wherein the target risk level includes the first risk level of the current overcurrent stage I setting and at least one of the second risk level.

2. The method according to claim 1, characterized in that According to the current capacity of the line, the prospective capacity of the line, the current capacity of photovoltaic power generation outside the line, the prospective capacity of photovoltaic power generation outside the line, the photovoltaic power generation insurance capacity outside the line allowed by the set value, the photovoltaic insurance capacity of the line allowed by the set value, the current maximum photovoltaic reverse current, the prospective maximum photovoltaic reverse current, the maximum allowable current of the line, the reliability coefficient of the first tripping switch of the current overcurrent stage I set value and the sensitivity coefficient of the current overcurrent stage III set value, the target adaptability of the current overcurrent set value is determined, including: Determine the first adaptability of the current overcurrent section I setting according to the current photovoltaic boost capacity outside the line, the prospective photovoltaic boost capacity outside the line, the photovoltaic boost insurance capacity outside the line allowed by the setting, and the reliability coefficient of the current overcurrent section I setting to avoid the first tripping switch; And / or, determine the second adaptability of the current overcurrent segment III constant based on the current capacity of the line, the prospective capacity of the line, the photovoltaic insurance capacity of the line allowed by the constant, the current maximum photovoltaic reverse current, the prospective maximum photovoltaic reverse current, the maximum allowable current of the line and the sensitivity coefficient of the current overcurrent segment III constant.

3. The method according to claim 2, characterized in that According to the current capacity of photovoltaic boost outside the line, the prospective capacity of photovoltaic boost outside the line, the photovoltaic boost insurance capacity outside the line allowed by the set value, and the reliability coefficient of the current overcurrent stage I set value avoiding the first tripping switch, the first adaptability of the current overcurrent stage I set value is determined, including: According to the reliability coefficient of the first trippable switch of the current overcurrent stage I setting, determining the first sub-adaptability of the current overcurrent stage I setting when photovoltaic power is not considered; Determine the second sub-adaptability of the current overcurrent I stage constant value according to the current photovoltaic boost capacity outside the line and the photovoltaic boost insurance capacity outside the line allowed by the constant value; Determine the third sub-adaptability of the current overcurrent I stage constant value according to the photovoltaic auxiliary capacity outside the line and the photovoltaic auxiliary insurance capacity outside the line allowed by the constant value; According to the first sub-adaptability, the second sub-adaptability and the third sub-adaptability, the first adaptability of the current overcurrent I stage constant is determined.

4. The method according to claim 3, characterized in that Determining the target risk level of the current overcurrent setting value according to the target adaptability and the preset evaluation standard includes: 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 adaptable, determining the first risk level to be an orange warning; If the first adaptability is adapted to the second sub-adaptability and the third sub-adaptability is not adapted, determining the first risk level to be a yellow warning; If the first adaptability is the third sub-adaptability, the first risk level is determined to be a blue warning.

5. The method according to claim 2, characterized in that: According to the current capacity of the line, the prospective capacity of the line, the photovoltaic insurance capacity of the line allowed by the set value, the current maximum photovoltaic reverse current, the prospective maximum photovoltaic reverse current, the maximum allowable current of the line and the sensitivity coefficient of the current overcurrent stage III set value, the target adaptability of the current overcurrent set value is determined, including: According to the sensitivity coefficient of the current overcurrent stage III setting, determining the fourth sub-adaptability of the current overcurrent stage III setting when photovoltaic power is not considered; Determine the fifth sub-adaptability of the current overcurrent III stage setting according to the current capacity of the line, the photovoltaic fuse capacity of the line allowed by the setting, the current maximum photovoltaic reverse current and the maximum allowable current of the line; Determine the sixth sub-adaptability of the current overcurrent III stage setting according to the prospect capacity of the line, the photovoltaic insurance capacity of the line allowed by the setting, the prospect photovoltaic maximum reverse current and the maximum allowable current of the line; According to the fourth sub-adaptability, the fifth sub-adaptability and the sixth sub-adaptability, the second adaptability of the current overcurrent stage III constant is determined.

6. The method according to claim 5, characterized in that Determining the target risk level of the current overcurrent setting value according to the target adaptability and the preset evaluation standard includes: If the second adaptability is adapted to the fourth sub-adaptability and the fifth sub-adaptability is not adapted, determining that the second risk level is a red warning; If the second adaptability is not adapted to the fourth sub-adaptability, determining the second risk level as orange warning; If the second adaptability is adapted to the fifth sub-adaptability and not adapted to the sixth sub-adaptability, determining the second risk level as a yellow warning; If the second adaptability is the sixth sub-adaptability, the second risk level is determined to be a blue warning.

7. The method according to claim 1, characterized in that Determining the current capacity of the photovoltaic power generation outside the line according to the first electrical parameter and the second electrical parameter includes: The current capacity of photovoltaic power generation outside the line is determined according to the current capacity of the entire station and the current capacity of the line.

8. The method according to claim 1, characterized in that Determining the photovoltaic augmentation prospect capacity outside the line according to the first electrical parameter and the second electrical parameter includes: Based on the prospective capacity of the entire station and the prospective capacity of the line, the prospective capacity of photovoltaic power generation outside the line is determined.

9. The method according to claim 1, characterized in that: Determining a fixed value to allow photovoltaic power generation insurance capacity outside the line according to the first electrical parameter and the second electrical parameter includes: Determine the reliability coefficient of the current overcurrent stage I setting to avoid the first trip switch according to the current overcurrent setting, the large mode system impedance, and the impedance from the outgoing line to the first trip switch; According to the reliability coefficient and the large-mode system impedance, a constant value is determined to allow photovoltaic power outside the line to increase the insurance capacity.

10. The method according to claim 1, characterized in that Determining a fixed value to allow the photovoltaic insurance capacity of the line according to the first electrical parameter and the second electrical parameter includes: Determine the sensitivity coefficient of the current overcurrent section III set value according to the current overcurrent set value, the small mode system impedance, and the longest path line impedance; According to the sensitivity coefficient and the longest path line impedance, a fixed value is determined to allow the photovoltaic insurance capacity of the line.

11. The method according to claim 1, characterized in that: Determining a current maximum photovoltaic reverse current according to the first electrical parameter and the second electrical parameter includes: According to the current capacity of the line, the current maximum photovoltaic reverse current is determined.

12. The method according to claim 1, characterized in that Determining the maximum reverse current of Envision Photovoltaic according to the first electrical parameter and the second electrical parameter includes: According to the prospective capacity of the line, the prospective maximum photovoltaic reverse current is determined.

13. The method according to claim 1, characterized in that Determining a recommended value of the current overcurrent setting according to the first electrical parameter, the second electrical parameter, the photovoltaic auxiliary capacity outside the line, the line prospect capacity and the prospect photovoltaic maximum reverse current, including: According to the photovoltaic auxiliary capacity outside the line, the large-scale system impedance and the impedance value from the outgoing line to the first trippable switch, the recommended lower limit of the overcurrent stage I constant value is determined; Determine the upper limit of the recommended overcurrent stage I constant value based on the small mode system impedance; According to the maximum allowable current of the line and the maximum reverse current of Envision PV, determine the recommended lower limit of the overcurrent stage III constant; The recommended upper limit of the overcurrent stage III constant is determined based on the long-term capacity of the line, the small-mode system impedance and the longest path line impedance.

14. A fixed value adaptability assessment device for an active distribution network, used to implement the fixed value adaptability assessment method for an active distribution network as claimed in any one of claims 1 to 13, characterized in that: The device comprises: A parameter acquisition module is used to acquire the first electrical parameters of the target substation and the second electrical parameters of the line; wherein the first electrical parameters include the current capacity of the entire station, the prospective capacity of the entire station, the large-mode system impedance and the small-mode system impedance; the second electrical parameters include the current capacity of the line, the open capacity of the line, the maximum allowable current of the line, the impedance value from the outgoing line to the first trippable switch, the longest path line impedance and the current overcurrent section I constant value and the current overcurrent section III constant value; A parameter determination module, for determining the prospect capacity of the line, the current capacity of photovoltaic assistance outside the line, the prospect capacity of photovoltaic assistance outside the line, the fixed value allowed photovoltaic assistance insurance capacity outside the line, the fixed value allowed photovoltaic insurance capacity of the line, the current maximum photovoltaic reverse current, the prospective maximum photovoltaic reverse current, the reliability coefficient of the first tripping switch of the current overcurrent section I fixed value and the sensitivity coefficient of the current overcurrent section III fixed value, respectively, according to 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 according to the current capacity of the line, the prospective capacity of the line, the current photovoltaic-assisted capacity outside the line, the prospective capacity of the photovoltaic-assisted capacity outside the line, the fixed value allowed photovoltaic-assisted insurance capacity outside the line, the fixed value allowed photovoltaic insurance capacity of the line, the current maximum photovoltaic reverse current, the prospective maximum photovoltaic reverse current, the maximum allowable current of the line, the reliability coefficient of the first tripping switch of the current overcurrent segment I setting and the sensitivity coefficient of the current overcurrent segment III setting; wherein the target adaptability includes at least one of the first adaptability of the current overcurrent segment I setting and the second adaptability of the current overcurrent segment III setting; An adaptability assessment module is used to determine the target risk level of the current overcurrent setting according to the target adaptability and preset assessment standards, and when the target risk level is higher than the preset level, determine the recommended value of the current overcurrent setting according to the first electrical parameter, the second electrical parameter, the photovoltaic auxiliary capacity outside the line, the prospective capacity of the line and the prospective photovoltaic maximum reverse current; wherein the target risk level includes the first risk level of the current overcurrent stage I setting and at least one of the second risk level.

15. An electronic device, characterized in that: The device comprises: 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, and the computer program is executed by the at least one processor so that the at least one processor can execute the set value adaptability assessment method for an active power distribution network as described in any one of claims 1 to 13.

16. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the set value adaptability assessment method for an active power distribution network according to any one of claims 1 to 13 when executed.

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