A method and device for controlling power frequency temporary overvoltage of direct current sending end after fault

Abstract

The application provides a method and device for controlling power frequency temporary overvoltage of a direct current sending end after a fault, wherein the method comprises the following steps: determining a direct current category according to a first power supply parameter of a direct current sending end power supply connected with a main network of the sending end, then performing different direct current fault simulations for different direct current categories, calculating a bus transient voltage out-of-limit value according to a bus transient voltage collected during the direct current fault simulation and a set power frequency temporary overvoltage threshold value, and then adjusting the starting of the direct current sending end power supply and the direct current power according to the bus transient voltage out-of-limit value by using different control strategies. The method and device can ensure that the transient voltage rise of the direct current near-zone bus and the new energy station during the fault does not exceed the limit, thereby effectively maintaining the safety and stability of the system voltage.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power grid simulation, and more particularly, to a method and device for controlling power frequency temporary overvoltage of a DC sending end after a fault. BACKGROUND

[0002] From the perspective of a DC power source connected to a sending end main grid, since in the past DC is basically sent out by a power source group and is closely linked to a local grid, the risk of voltage instability is small, and therefore there is no specific requirement for short-circuit ratio for a DC rectifier station. With the reduction of conventional power sources in a UHV DC supporting power source and the substantial increase in the scale of new energy sources, the connection of the DC rectifier station to the AC grid is relatively weakened, and after a fault of the DC, a large amplitude of transient voltage rise occurs, and in a serious case, the large amplitude of transient voltage rise has a great impact on the stability of the AC system. SUMMARY

[0003] In order to solve the technical problem in the prior art that under the condition of substantial increase in the scale of new energy sources in a UHV DC supporting power source, the transient voltage of a DC near-zone bus and a new energy station during a fault is easy to exceed the limit, affecting the safety and stability of the grid voltage, the present application provides a method and device for controlling power frequency temporary overvoltage of a DC sending end after a fault.

[0004] According to an aspect of the present application, the present application provides a method for controlling power frequency temporary overvoltage of a DC sending end after a fault, the method comprising:

[0005] collecting a first power source parameter of a DC sending end power source connected to a sending end main grid, wherein the DC sending end power source comprises new energy and conventional power sources other than new energy, and the first power source parameter comprises new energy output before a fault, unit matching capacity and start-up capacity of conventional power sources;

[0006] determining a DC category according to the first power source parameter, wherein the DC category comprises a pure conventional power source sending type DC and a wind-fire bundled power source sending type DC;

[0007] when the DC category is the pure conventional power source sending type DC, performing fault simulation on the grid, and determining a second power source parameter and a second DC power of the grid according to the first power source parameter of the DC sending end power source, a post-fault bus transient voltage value collected and a first DC power according to a set first control strategy;

[0008] when the DC category is the wind-fire bundled power source sending type DC, performing fault simulation on the grid, and determining a third power source parameter and a third DC power of the grid according to the first power source parameter of the DC sending end power source, a set power frequency temporary overvoltage threshold value, a post-fault bus transient voltage value collected and a line transmission DC power according to a set second control strategy.

[0009] According to another aspect of the present application, the present application provides a device for controlling post-fault power frequency temporary overvoltage of a direct current sending end, the device comprising:

[0010] a data acquisition module configured to acquire first power supply parameters of a direct current sending end power supply connected to a main grid of the sending end, wherein the direct current sending end current comprises new energy and conventional power supply other than the new energy, and the first power supply parameters comprise new energy output before the fault, unit matching capacity and start-up capacity of the conventional power supply;

[0011] a power supply type module configured to determine a direct current category according to the first power supply parameters, wherein the direct current category comprises a pure conventional power supply sending type direct current and a wind-fire bundled power supply sending type direct current;

[0012] a first control module configured to, when the direct current category is the pure conventional power supply sending type direct current, perform fault simulation on the grid, and according to the first power supply parameters of the direct current sending end power supply, acquired post-fault bus transient voltage values and first direct current power, determine second power supply parameters and second direct current power of the grid according to a set first control strategy;

[0013] a second control module configured to, when the direct current category is the wind-fire bundled power supply sending type direct current, perform fault simulation on the grid, and according to the first power supply parameters of the direct current sending end power supply, a set power frequency temporary overvoltage threshold value, acquired post-fault bus transient voltage values and line-transmitted direct current power, determine third power supply parameters and third direct current power of the grid according to a set second control strategy.

[0014] According to still another aspect of the present application, the present application provides a computer readable storage medium, the storage medium storing a computer program, the computer program being configured to execute the method according to any one of the above aspects of the present application.

[0015] According to still another aspect of the present application, an electronic device is provided, the electronic device comprising: a processor; a memory configured to store executable instructions of the processor; and the processor configured to read the executable instructions from the memory and execute the instructions to implement the method according to any one of the above aspects of the present application.

[0016] The method and device for controlling the power frequency temporary overvoltage of the DC sending end after a fault, wherein the method comprises: determining the DC category according to the first power supply parameter of the DC sending end power supply connected to the main network of the sending end, then performing different DC fault simulations for different DC categories, calculating the bus transient voltage out-of-limit value according to the bus transient voltage collected during the DC fault simulation and the set power frequency temporary overvoltage threshold, and then adjusting the DC sending end power supply and the DC power according to the bus transient voltage out-of-limit value. The method and device can ensure that the transient voltage rise of the DC near-zone bus and the new energy station during the fault does not exceed the limit, thereby effectively maintaining the safety and stability of the system voltage. BRIEF DESCRIPTION OF DRAWINGS

[0017] The exemplary embodiments of this application can be more fully understood with reference to the following drawings in which:

[0018] Figure 1 The flow chart of the method for controlling the power frequency temporary overvoltage of the DC sending end after a fault according to the preferred embodiment of the application;

[0019] Figure 2 The structural schematic diagram of the device for controlling the power frequency temporary overvoltage of the DC sending end after a fault according to the preferred embodiment of the application;

[0020] Figure 3 The structural schematic diagram of the electronic device according to the preferred embodiment of the application. DETAILED DESCRIPTION

[0021] The exemplary embodiments of this application can be more fully understood with reference to the following drawings in which:

[0022] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0023] Exemplary method

[0024] Figure 1 The flow chart of the method for controlling the power frequency temporary overvoltage of the DC sending end after a fault according to the preferred embodiment of the application. As Figure 1As shown, the flowchart of the method for controlling the power frequency temporary overvoltage of the DC sending end after a fault according to the preferred embodiment starts from step 101.

[0025] In step 101, the first power supply parameters of the DC sending end power supply connected to the main grid of the sending end are collected, wherein the DC sending end current includes new energy and conventional power supply other than new energy, and the first power supply parameters include the output of new energy before the fault, the unit matching capacity and the actual starting capacity of the conventional power supply.

[0026] In the preferred embodiment, the DC sending end power supply includes new energy stations such as photovoltaic power stations and wind power stations, and conventional power stations such as hydropower stations and thermal power stations. For new energy stations, the output value of the station needs to be collected, and for hydropower stations and thermal power stations, the unit matching capacity and the actual starting capacity need to be collected.

[0027] In step 102, the DC category is determined according to the first power supply parameters, wherein the DC category includes pure conventional power supply sending type DC and wind-fire bundled power supply sending type DC.

[0028] Preferably, the determination of the DC category according to the first power supply parameters includes:

[0029] When the new energy output in the first power supply parameters is equal to 0, the DC category is determined as pure conventional power supply sending type DC.

[0030] When the new energy output in the first power supply parameters is greater than 0, the DC category is determined as wind-fire bundled power supply sending type DC.

[0031] When the DC category is divided in the preferred embodiment, whether the new energy station is output is mainly used as the criterion.

[0032] In step 103, when the DC category is pure conventional power supply sending type DC, the grid is subjected to fault simulation, and the second power supply parameters and the second DC power of the grid are determined according to the first power supply parameters of the DC sending end power supply, the set power frequency temporary overvoltage threshold value, the collected post-fault bus transient voltage value and the first DC power, and the set first control strategy.

[0033] Preferably, when the DC category is pure conventional power supply sending type DC, the grid is subjected to fault simulation, and the second power supply parameters and the second DC power of the grid are determined according to the first power supply parameters of the DC sending end power supply, the collected post-fault bus transient voltage value and the first DC power, and the set first control strategy, wherein the first control strategy includes:

[0034] In step 301, the bus transient voltage value U i and the set power frequency temporary overvoltage threshold value Umax , calculate the busbar transient voltage over-limit value ΔU at the i-th fault point i , and its calculation formula is:

[0035] ΔU i =U i -U max

[0036] Where i is a natural number;

[0037] In step 302, when the unit supporting capacity CP of conventional power sources other than new energy max Greater than the startup capacity CP0, and ΔU i When CP is greater than 0, i =CP0+i*CP step0 , among which, CP step0 It is the preset first step length value of the normal power supply. CP0 is the normal power supply capacity before the fault. CP i It is based on the bus transient voltage value U at the sampling point after the i-th fault i The proposed adjusted startup capacity value of conventional power sources other than new energy sources is determined. i Greater than CP max When the CP is reset directly i , so that CP i Equal to CP max , let i=i+1, and return to step 301;

[0038] In step 303, when the unit supporting capacity CP of conventional power sources other than new energy max Greater than the startup capacity CP0, and ΔU i When it is not greater than 0, the second power supply parameter of the power grid is determined to be the startup capacity CP of the conventional power supply. i ;

[0039] In step 304, when the unit supporting capacity CP of conventional power sources other than new energy max Equal to the startup capacity CP0, and ΔU i When it is greater than 0, let i=i+1, P i =P 1a -(i-1)*P step0 , return to step 301, where P step0 is the preset first step length value of DC power regulation, P 1a It is the unit supporting capacity CP of conventional power sources other than new energy sources max Equal to the DC power of the grid collected when the power is turned on at capacity CP0, P i It is based on the bus transient voltage value U at the sampling point after the i-1th fault i Determine the DC power value to be adjusted for the power grid;

[0040] In step 305, when the unit matching capacity of the conventional power source other than the new energy source is equal to the starting capacity CP0 max , and ΔU i is not greater than 0, the second power grid parameter of the power grid is determined as the unit matching capacity CP0 max of the conventional power source, and the second DC power of the power grid is P0 i .

[0041] In the preferred embodiment, when the DC category is the pure conventional power source sending type DC, due to the temporary low voltage of the power grid in the vicinity of the converter station after the DC fault, the reactive power consumption of the converter is reduced, and the temporary overvoltage in the vicinity is more serious due to the surplus of the reactive power of the converter station. Therefore, the DC bipolar blocking fault with the least reactive power consumption of the converter station after the fault is taken as the constraint fault for controlling the temporary overvoltage of the DC power frequency. If the DC bipolar blocking fault is simulated, the set step value, such as 100 MW, can be used to adjust the conventional power source at the sending end of the DC and the DC power so that the bus transient voltage is lower than the set threshold of the power frequency temporary overvoltage, so that the power grid will not have the problem of power frequency temporary overvoltage after any fault.

[0042] Preferably, the method further comprises setting the limit ΔU min that distinguishes the severity of the power frequency temporary overvoltage after the fault of the power grid, wherein:

[0043] Step 302 is replaced by:

[0044] When the unit matching capacity CP0 max of the conventional power source other than the new energy source is greater than the starting capacity CP0, if 0 < ΔU i < ΔU min , CP0 i = CP0 + i*CP step1 , i = i + 1, return to step 301, if ΔU i is not less than ΔU min , CP0 i = CP0 + i*CP step2 , i = i + 1, return to step 301, wherein CP0 step1 and CP0 step1 are respectively the second step value and the third step value of the conventional power source starting set in advance, CP0 step2 < CP0 i , when CP0 max is greater than CP0 i , directly reset CP0 i to equal CP0 max .

[0045] Step 304 is replaced by:

[0046] When the unit matching capacity CP of the conventional power source other than the new energy source max equals the starting capacity CPO, if 0 < ΔU i < ΔU min , let i = i + 1, P i = P 1a - (i-1) * P step1 , return to step 301, if ΔU i is not less than ΔU min , let i = i + 1, P i = P step2 - (i-1) * P step1 , return to step 301, wherein P step2 is a pre-set direct current power adjustment second step value, P step1 < P step2 .

[0047] Further, when the direct current type is the pure conventional power source sending type direct current, in the case of proposing the starting capacity of the direct current sending end power source and the direct current power according to the bus transient voltage out-of-limit value to be iterated step by step according to the set step value, such as 100 MW, to control the power frequency temporary overvoltage, in order to further improve the adjustment accuracy, the limit value ΔU min is set to distinguish the severity of the power frequency temporary overvoltage after the power grid fault, when the bus transient voltage out-of-limit value is greater than ΔU min , it is considered that the power frequency temporary overvoltage problem of the power grid is serious, so as to increase the set step value, such as 150 MW, so as to speed up the speed of suppressing the influence of the power frequency temporary overvoltage on the power grid, and when the bus transient voltage out-of-limit value is less than ΔU min , it is considered that the power grid only has mild power frequency temporary overvoltage, at this time, the set step value can be appropriately reduced, such as from 150 MW to 50 MW, and the power frequency temporary overvoltage is better suppressed through fine control. Obviously, compared with only setting one step value to suppress the power frequency temporary overvoltage, the flexibility and accuracy of the regulation and control are increased.

[0048] In step 104, when the direct current type is the wind-fire bundled power source sending type direct current, the power grid is simulated for fault, and according to the first power source parameter of the direct current sending end power source, the set power frequency temporary overvoltage threshold value, the collected bus transient voltage value after the fault and the line transmission direct current power, the third power source parameter and the third direct current power of the power grid are determined according to the set second control strategy.

[0049] Preferably, when the direct current category is a wind-fire bundled power source outgoing type direct current, a fault simulation is performed on the power grid, and a power frequency temporary overvoltage threshold value is set according to the first power source parameter of the direct current sending end power source, a post-fault bus transient voltage value is collected, and a direct current power transmitted by a line is collected, and a third power source parameter and a third direct current power of the power grid are determined according to a set second control strategy, wherein the second control strategy comprises:

[0050] In step 501, a bus transient voltage over-limit value ΔU j is calculated at the jth post-fault sampling point according to a bus transient voltage value U max and a set power frequency temporary overvoltage threshold value U j , and the calculation formula is:

[0051] ΔU j = U j -U max

[0052] In the formula, j is a natural number;

[0053] In step 502, when the unit matching capacity CP max of the conventional power source other than the new energy source is greater than the start-up capacity CP0, and ΔU j is greater than 0, CP j is set as CP0+j*CP step3 , when CP j is greater than CP max , CP i is directly reset to be equal to CP j , j is set as j+1, and the step 501 is returned, wherein CP max is a pre-set fourth step length value of the start-up capacity of the conventional power source, CP0 is the start-up capacity of the conventional power source before the fault, and CP step3 is a post-fault adjusted start-up capacity value of the conventional power source other than the new energy source determined according to the bus transient voltage value U j at the jth post-fault sampling point.

[0054] In step 503, when the unit matching capacity CP j of the conventional power source other than the new energy source is greater than the start-up capacity CP0, and ΔU max is not greater than 0, the third power source parameter of the power grid is determined to be the start-up capacity CP j of the conventional power source.

[0055] In step 504, when the unit matching capacity CP j of the conventional power source other than the new energy source is equal to the start-up capacity CP0, NP max is greater than 0, and ΔU j is not greater than 0, the third power source parameter of the power grid is determined to be the start-up capacity CP i of the conventional power source.When it is greater than 0, let NP j =NP0-j*NP step0 , j=j+1, return to step 501, where NP step0 It is the preset first step value of the new energy output adjustment. NP0 is the new energy output before the fault. NP j It is based on the bus transient voltage value U at the sampling point after the jth fault j The determined grid plans to adjust the new energy output value, NP j The minimum value of is 0;

[0056] In step 505, when the unit supporting capacity CP of conventional power sources other than new energy max Equal to the power-on capacity CP0, NP j is greater than 0, and ΔU i When it is not greater than 0, the third power source parameter of the power grid is determined to be the unit matching capacity CP of the conventional power source. max and new energy output NP j ;

[0057] In step 506, when the unit supporting capacity CP of conventional power sources other than new energy max Equal to the power-on capacity CP0, NP j is equal to 0, and ΔU i When it is greater than 0, let j=j+1, P j =P 1b -(j-1)*P step3 , return to step 501, where P step3 is the preset fourth step value of DC power regulation, P 1b It is the unit supporting capacity CP of conventional power sources other than new energy sources max Equal to the power-on capacity CP0, and NP j The DC power of the grid collected when it is equal to 0, P j It is based on the bus transient voltage value U at the sampling point after the j-1th fault j Determine the DC power value to be adjusted for the power grid;

[0058] In step 507, when the capacity of the conventional power source other than the new energy source is equal to the startup capacity CP max , NP j is equal to 0, and ΔU i When it is not greater than 0, the third power source parameter of the power grid is determined to be the unit matching capacity CP of the conventional power source. max , the third DC power of the grid is P j .

[0059] In the preferred embodiment, when the direct current category is a wind-fire bundled power supply outgoing type direct current, there are two reasons for the voltage rise after the fault of the wind-fire bundled power supply outgoing type direct current: one is that the reactive power consumption of the converter increases sharply after the system fails, causing temporary low voltage in the vicinity of the converter station, and then the reactive power consumption of the converter decreases, causing temporary overvoltage in the vicinity of the converter station. The second is that during the fault, the new energy unit enters low voltage ride through, the active power decreases significantly, the reactive power increases significantly, and the reactive power on the new energy side is surplus after the fault. The superimposed effect of the two leads to continuous commutation failure of the direct current as the constraint fault of the temporary overvoltage of the direct current at power frequency. If the continuous commutation failure fault of the direct current is simulated, the bus transient voltage can be kept below the set temporary overvoltage threshold at power frequency by adjusting the direct current power and the conventional power supply and new energy at the sending end of the direct current according to the set step value, such as 100 MW, so that the power grid will not have the problem of temporary overvoltage at power frequency after any fault occurs.

[0060] Preferably, the method further comprises setting a limit ΔU min for the severity of the temporary overvoltage at power frequency after the fault of the power grid, wherein:

[0061] Step 502 is replaced by:

[0062] When the unit matching capacity CP max of the conventional power supply other than new energy is greater than the starting capacity CP0, if 0 < ΔU i < ΔU min , let CP j = CP0 + j * CP step4 , if ΔU i is not less than ΔU min , let CP j = CP0 + j * CP step5 , when CP j is greater than CP max , directly reset CP i , so that CP i is equal to CP max , let j = j + 1, and return to step 501, wherein CP step4 and CP step5 are the fifth and sixth step values of the conventional power supply starting capacity set in advance, respectively, and CP step4 < CP step5 ;

[0063] Step 504 is replaced by:

[0064] When the unit matching capacity CP max of the conventional power supply other than new energy is equal to the starting capacity CP0, and NP j is greater than 0, if 0 < ΔU i < ΔUmin , let NP j =NP0-j*NP step1 , if ΔU i Not less than ΔU min , let NP j =NP0-j*NP step2 , and let j = j + 1, return to step 501, where NP step1 and NP step2 It is the preset second and third step values ​​for the new energy output adjustment, NP step1 <NP step2 ;

[0065] Step 506 is replaced by:

[0066] When the unit supporting capacity CP of conventional power sources other than new energy max Equal to the power-on capacity CP0, NP j When equal to 0, if 0<ΔU i <ΔU min , let j = j + 1, P j =P 1b -(j-1)*P step4 , if ΔU i Not less than ΔU min , let j = j + 1, P j =P 1b -(j-1)*P step5 , return to step 501, where P step4 and P step5 are the preset fifth and sixth step values ​​of DC power adjustment, P step4 <P step5 .

[0067] Furthermore, when the DC type is a wind-thermal bundled power supply DC, this preferred embodiment proposes to iterate the startup capacity of the conventional power supply at the DC sending end, the output of new energy, and the DC power according to the set step value, such as 100MW, according to the bus transient voltage exceeding the limit value to control the temporary power frequency overvoltage. In order to further improve the adjustment accuracy, a limit value ΔU is set to distinguish the severity of the temporary power frequency overvoltage after the power grid fault. min When the busbar transient voltage exceeds the limit value and is greater than ΔU min , it is believed that the power frequency temporary overvoltage problem in the power grid is serious, so the set step value is increased, such as 150MW, to speed up the speed of suppressing the impact of power frequency temporary overvoltage on the power grid, and when the bus transient voltage exceeds the limit value less than ΔU minWhen the power grid only experiences a slight power frequency temporary overvoltage, the step value set can be appropriately reduced, for example, from 150 MW to 50 MW, so as to better suppress the power frequency temporary overvoltage through fine control. Obviously, compared with setting only one step value to suppress the power frequency temporary overvoltage, the above method increases the flexibility and accuracy of control.

[0068] Preferably, the second power supply parameter and the second DC power are the power supply parameter and the DC power in the case of the DC sending-end power frequency temporary overvoltage generated after the power grid performs DC bipolar blocking fault simulation; and the third power supply parameter and the third DC power are the power supply parameter and the DC power in the case of the DC sending-end power frequency temporary overvoltage generated after the power grid performs DC continuous commutation failure fault simulation.

[0069] In the preferred embodiment, it is found through simulation experiments that, when the DC category is a conventional power supply sent-out type DC, the power grid performs DC bipolar blocking fault simulation, and the second power supply parameter and the second DC power obtained according to the first control strategy can meet the power supply and DC power configuration when the power grid experiences other faults. Similarly, when the DC category is a wind-fire bundled power supply sent-out type DC, the power grid performs DC continuous commutation failure fault simulation, and the third power supply parameter and the third DC power obtained according to the second control strategy can meet the power supply and DC power configuration when the power grid experiences other faults. Therefore, in actual application, different fault simulation types are directly selected according to different DC categories, and the power supply and DC power are configured according to the corresponding control strategy, so that the effective power supply and DC power configuration in the case of the DC sending-end power frequency temporary overvoltage after a fault can be quickly determined, and the efficiency of controlling the DC sending-end power frequency temporary overvoltage after a fault of the power grid is greatly improved. The method for controlling the DC sending-end power frequency temporary overvoltage after a fault according to the preferred embodiment determines the DC category according to the first power supply parameter of the DC sending-end power supply connected to the sending-end main grid, then performs different DC fault simulations according to different DC categories, calculates the bus transient voltage out-of-limit value according to the bus transient voltage during the DC fault simulation and the set power frequency temporary overvoltage threshold value, and adjusts the DC sending-end power supply and the power grid power according to the bus transient voltage out-of-limit value by using different control strategies. The method and device can ensure that the transient voltage rise of the DC near-zone bus and the new energy station during a fault does not exceed the limit, thereby effectively maintaining the safety and stability of the system voltage.

[0070] Exemplary apparatus

[0071] Figure 2 The structure of the device for controlling the DC sending-end power frequency temporary overvoltage after a fault according to the preferred embodiment of the application is shown in FIG. 2. Figure 2 As shown in FIG. 2, the device 200 for controlling the DC sending-end power frequency temporary overvoltage after a fault according to the preferred embodiment of the application comprises:

[0072] The data acquisition module 201 is configured to acquire a first power parameter of a direct-current sending terminal power source connected to a sending terminal main grid, wherein the direct-current sending terminal power source includes new energy and conventional power sources other than the new energy, and the first power parameter includes new energy output before a fault, unit matching capacity and start-up capacity of the conventional power sources;

[0073] The power type module 202 is configured to determine a direct-current category according to the first power parameter, wherein the direct-current category includes pure conventional power source sending type direct current and wind-fire bundled power source sending type direct current.

[0074] The first control module 203 is configured to, when the direct-current category is the pure conventional power source sending type direct current, perform fault simulation on the grid, and according to the first power parameter of the direct-current sending terminal power source, the acquired post-fault bus transient voltage value and the first direct-current power, determine a second power parameter and a second direct-current power of the grid according to a set first control strategy.

[0075] The second control module 204 is configured to, when the direct-current category is the wind-fire bundled power source sending type direct current, perform fault simulation on the grid, and according to the first power parameter of the direct-current sending terminal power source, a set power frequency temporary overvoltage threshold value, the acquired post-fault bus transient voltage value and the line-transmitted direct-current power, determine a third power parameter and a third direct-current power of the grid according to a set second control strategy.

[0076] Preferably, the power type module 202 determines the direct-current category according to the first power parameter, including:

[0077] When the new energy output in the first power parameter is equal to 0, the direct-current category is determined as the pure conventional power source sending type direct current.

[0078] When the new energy output in the first power parameter is greater than 0, the direct-current category is determined as the wind-fire bundled power source sending type direct current.

[0079] Preferably, the first control module 203 is configured to, when the direct-current category is the pure conventional power source sending type direct current, perform fault simulation on the grid, and according to the first power parameter of the direct-current sending terminal power source, the acquired post-fault bus transient voltage value and the first direct-current power, determine a second power parameter and a second direct-current power of the grid according to a set first control strategy, wherein the first control strategy includes:

[0080] In step 301, according to the bus transient voltage value U i of the i th post-fault sampling point and the set power frequency temporary overvoltage threshold value U max , the bus transient voltage out-of-limit value ΔU i of the i th post-fault point is calculated, and the calculation formula is:

[0081] ΔU i =U i -U max

[0082] Where i is a natural number;

[0083] In step 302, when the unit supporting capacity CP of conventional power sources other than new energy max Greater than the startup capacity CP0, and ΔU i When CP is greater than 0, i =CP0+i*CP step0 , among which, CP step0 It is the preset first step length value of the normal power supply. CP0 is the normal power supply capacity before the fault. CP i It is based on the bus transient voltage value U at the sampling point after the i-th fault i The proposed adjusted startup capacity value of conventional power sources other than new energy sources is determined. i Greater than CP max When the CP is reset directly i , making CP i Equal to CP max , let i=i+1, and return to step 301;

[0084] In step 303, when the unit supporting capacity CP of conventional power sources other than new energy max Greater than the startup capacity CP0, and ΔU i When it is not greater than 0, the second power supply parameter of the power grid is determined to be the startup capacity CP of the conventional power supply. i ;

[0085] In step 304, when the unit supporting capacity CP of conventional power sources other than new energy max Equal to the startup capacity CP0, and ΔU i When it is greater than 0, let i=i+1, P i =P 1a -(i-1)*P step0 , return to step 301, where P step0 is the preset first step length value of DC power regulation, P 1a It is the unit supporting capacity CP of conventional power sources other than new energy sources max Equal to the DC power of the grid collected when the power is turned on at capacity CP0, P i It is based on the bus transient voltage value U at the sampling point after the i-1th fault i Determine the DC power value to be adjusted for the power grid;

[0086] In step 305, when the supporting capacity of the conventional power source other than the new energy source is equal to the starting capacity CPmax , and ΔU i When it is not greater than 0, the second power supply parameter of the power grid is determined to be the unit matching capacity CP of the conventional power supply. max , the second DC power of the grid is P i .

[0087] Preferably, the first control module is further configured to set a limit value ΔU for distinguishing the severity of temporary power frequency overvoltage after a power grid fault. min , wherein the first control strategy includes:

[0088] Step 302 is replaced by:

[0089] When the unit supporting capacity CP of conventional power sources other than new energy max When it is greater than the startup capacity CP0, if 0<ΔU i <ΔU min , let CP i =CP0+i*CP step1 , i=i+1, return to step 301, if ΔU i Not less than ΔU min , let CP i =CP0+i*CP step2 , i=i+1, return to step 301, where CP step1 They are the pre-set second and third step values ​​for normal power on, CP step1 <CP step2 , when CP i Greater than CP max When the CP is reset directly i , so that CP i Equal to CP max ;

[0090] Step 304 is replaced by:

[0091] When the unit supporting capacity CP of conventional power sources other than new energy max When the startup capacity is equal to CP0, if 0<ΔU i <ΔU min , let i=i+1, P i =P 1a -(i-1)*P step1 , return to step 301, if ΔU i Not less than ΔU min , let i=i+1, P i =P1-(i-1)*P step2 , return to step 301, where P step1 is the preset second step value of DC power regulation, P step2 is the preset third step value of DC power regulation, Pstep1 <P step2 .

[0092] Preferably, the second control module 204 is configured to, when the DC type is a wind-thermal bundled power supply transmission type DC, perform fault simulation on the power grid, and determine a third power supply parameter and a third DC power of the power grid according to a set second control strategy based on the first power supply parameter of the DC sending-end power supply, a set power frequency temporary overvoltage threshold, a collected post-fault bus transient voltage value, and the DC power transmitted by the line, wherein the second control strategy includes:

[0093] In step 501, according to the bus transient voltage value U at the jth sampling point after the fault, j And the set power frequency temporary overvoltage threshold U max , calculate the busbar transient voltage over-limit value ΔU at the jth fault point j , and its calculation formula is:

[0094] ΔU j =U j -U max

[0095] Where, j is a natural number;

[0096] In step 502, when the unit supporting capacity CP of conventional power sources other than new energy max Greater than the startup capacity CP0, and ΔU j When CP is greater than 0, j =CP0+j*CP step3 , when CP j Greater than CP max When the CP is reset directly i , making CP j Equal to CP max , let j = j + 1, return to step 501, where CP step3 It is the fourth step value of the pre-set normal power supply startup. CP0 is the startup capacity of the normal power supply before the fault. CP j It is based on the bus transient voltage value U at the sampling point after the jth fault j The proposed adjusted startup capacity values ​​of conventional power sources other than new energy sources;

[0097] In step 503, when the unit supporting capacity CP of conventional power sources other than new energy max Greater than the startup capacity CP0, and ΔU j When it is not greater than 0, the third power supply parameter of the power grid is determined to be the startup capacity CP of the conventional power supply. j ;

[0098] In step 504, when the unit supporting capacity CP of conventional power sources other than new energymax is equal to the on-line capacity CP0, NP j is greater than 0, and ΔU i is greater than 0, NP j is set to NP0-j*NP step0 , j=j+1, and return to step 501, wherein NP step0 is a pre-set first step length value of the new energy output adjustment, NP0is the new energy output before the fault, NP j is the grid tentative adjusted new energy output value determined according to the bus transient voltage value U j of the sampling point after the jth fault, and the minimum value of NP j is 0;

[0099] In step 505, when the unit matching capacity CP max of the conventional power source other than the new energy is equal to the on-line capacity CP0, NP j is greater than 0, and ΔU i is not greater than 0, the third power source parameter of the grid is determined as the unit matching capacity CP max of the conventional power source and the new energy output NP j ;

[0100] In step 506, when the unit matching capacity CP max of the conventional power source other than the new energy is equal to the on-line capacity CP0, NP j is equal to 0, and ΔU i is greater than 0, j is set to j+1, P j is set to P 1b -(j-1)*P step3 , and return to step 501, wherein P step3 is a pre-set fourth step length value of the DC power adjustment, P 1b is the grid DC power collected when the unit matching capacity CP max of the conventional power source other than the new energy is equal to the on-line capacity CP0and NP j is equal to 0, P j is the grid tentative adjusted DC power value determined according to the bus transient voltage value U j of the sampling point after the j-1th fault;

[0101] In step 507, when the unit matching capacity of the conventional power source other than the new energy is equal to the on-line capacity CP max , NP j is equal to 0, and ΔU i is not greater than 0, the third power source parameter of the grid is determined as the unit matching capacity CP max of the conventional power source, and the third DC power of the grid is P j .

[0102] Preferably, the second control module 204 is further configured to set a limit value ΔU for distinguishing the severity of temporary power frequency overvoltage after a power grid fault. min , wherein the second control strategy includes:

[0103] Step 502 is replaced by:

[0104] When the unit supporting capacity CP of conventional power sources other than new energy max When it is greater than the startup capacity CP0, if 0<ΔU i <ΔU min , let CP j =CP0+j*CP step4 , if ΔU i Not less than ΔU min , let CP j =CP0+j*CP step5 , when CP j Greater than CP max When the CP is reset directly i , making CP i Equal to CP max , let j = j + 1, return to step 501, where CP step4 and CP step5 They are the pre-set fifth and sixth step values ​​of conventional power on, CP step4 <CP step5 ;

[0105] Step 504 is replaced by:

[0106] When the unit supporting capacity CP of conventional power sources other than new energy max Equal to the power-on capacity CP0, NP j When it is greater than 0, if 0<ΔU i <ΔU min , let NP j =NP0-j*NP step1 , if ΔU i Not less than ΔU min , let NP j =NP0-j*NP step2 , and let j = j + 1, return to step 501, where NP step1 and NP step2 It is the preset second and third step values ​​for the new energy output adjustment, NP step1 <NP step2 ;

[0107] Step 506 is replaced by:

[0108] When the unit supporting capacity CP of conventional power sources other than new energy maxEqual to the starting capacity CP0, NP j Equal to 0, if 0 < ΔU i < ΔU min Let j = j + 1, P j = P 1b - (j - 1) * P step4 If ΔU i is not less than ΔU min , let j = j + 1, P j = P 1b - (j - 1) * P step5 Return to step 501, wherein P step4 and P step5 are respectively a fifth step length value and a sixth step length value of the direct current power adjustment which are set in advance, and P step4 < P step5 .

[0109] Preferably, the second power supply parameter and the second direct current power are the power supply parameter and the direct current power in the case of the direct current sending end power frequency temporary overvoltage after the direct current bipolar blocking fault simulation of the power grid; and the third power supply parameter and the third direct current power are the power supply parameter and the direct current power in the case of the direct current sending end power frequency temporary overvoltage after the direct current continuous commutation failure fault simulation of the power grid.

[0110] The device for controlling the direct current sending end power frequency temporary overvoltage according to the preferred embodiment of the present application determines the direct current category according to the first power supply parameter of the direct current sending end power supply connected with the main grid of the sending end, then performs different direct current fault simulations for different direct current categories, calculates the bus transient voltage overrun value according to the bus transient voltage collected during the direct current fault simulation and the set power frequency temporary overvoltage threshold value, and then takes different control strategies to adjust the power of the direct current sending end power supply and the power grid according to the bus transient voltage overrun value. The steps taken by the device are the same as those of the method for controlling the direct current sending end power frequency temporary overvoltage according to the present application, and the technical effects achieved are also the same, which will not be described here in detail.

[0111] Exemplary electronic device

[0112] Figure 3 A structure schematic diagram of an electronic device according to the preferred embodiment of the present application. The electronic device can be either one or both of the first device and the second device, or a single device independent of them, which can communicate with the first device and the second device to receive the collected input signals therefrom. Figure 3 A block diagram of an electronic device according to an embodiment of the present disclosure is shown. As shown in Figure 3 The electronic device includes one or more processors 301 and a memory 302.

[0113] The processor 301 can be a central processing unit (CPU) or other form of processing unit having data processing and / or instruction execution capabilities and can control other components in the electronic device to perform desired functions.

[0114] The memory 302 can include one or more computer program products that can include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory, for example, can include random access memory (RAM), cache memory, and / or the like. The non-volatile memory, for example, can include read-only memory (ROM), hard disk, flash memory, and / or the like. One or more computer program instructions can be stored on the computer-readable storage media, which the processor 301 can execute to implement the enterprise energy-consuming space-based energy anomaly diagnosis method and / or other desired functions of the various embodiments disclosed above. In one example, the electronic device can further include an input device 303 and an output device 304, which are interconnected through a bus system and / or other form of connection mechanism (not shown).

[0115] In addition, the input device 303 can further include, for example, a keyboard, a mouse, and / or the like.

[0116] The output device 304 can output various information to the outside. The output device 304 can include, for example, a display, a speaker, a printer, a communication network and a remote output device connected thereto, and / or the like.

[0117] Of course, in order to simplify, Figure 3 Only some of the components in the electronic device related to the present disclosure are shown in FIG. 3, and components such as buses, input / output interfaces, and / or the like are omitted. In addition, the electronic device can further include any other appropriate components according to a specific application.

[0118] Exemplary computer program product and computer readable storage medium

[0119] In addition to the above-described method and device, embodiments of the present disclosure can be a computer program product including computer program instructions that, when executed by a processor, cause the processor to perform the steps of the method of controlling post-fault DC sending end power frequency temporary overvoltage according to various embodiments of the present disclosure described in the above "Exemplary Methods" section of the specification.

[0120] The computer program product can be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C++, or the like, and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code can execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device and partly on a remote computing device or entirely on the remote computing device or server.

[0121] Furthermore, embodiments of the present disclosure can also be a computer readable storage medium, having stored thereon computer program instructions which, when executed by a processor, cause the processor to perform the steps described in the above-mentioned "Exemplary Method" section of the present specification for the method for controlling post-fault DC sending-end power frequency temporary overvoltage according to various embodiments of the present disclosure.

[0122] The computer readable storage medium can be any combination of one or more computer readable media. The computer readable medium can be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium include an electrical connection having one or more wires, a portable disc, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0123] The above describes the basic principles of the present disclosure in combination with specific embodiments, but it should be noted that the advantages, benefits, effects and the like mentioned in the present disclosure are only examples and are not limiting, and these advantages, benefits, effects and the like cannot be considered as the must-haves of each embodiment of the present disclosure. In addition, the above specific details are only for the purpose of example and understanding, and are not limiting, and the above details do not limit the present disclosure to the must-haves of the above specific details.

[0124] Each embodiment in the present specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between each embodiment can be mutually referred to. For the system embodiment, since it basically corresponds to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the part of the method embodiment.

[0125] The block diagrams of devices, apparatuses, equipment, systems referred to in this disclosure are merely illustrative examples and are not intended to require or imply that the connection, arrangement, configuration must be as shown in the block diagrams. These devices, apparatuses, equipment, systems can be connected, arranged, configured in any manner as will be appreciated by those skilled in the art. Words such as "include," "contain," "have," and the like are open-ended words that are to be interpreted to mean "including but not limited to," and are not to be interpreted as limiting the described embodiment to features, elements, and / or steps disclosed herein. The words "or" and "and" as used herein are to be interpreted as the word "and / or," and are not to be interpreted as requiring both features, elements, and / or steps disclosed herein. The word "such as" as used herein is to be interpreted as the phrase "such as but not limited to," and is not to be interpreted as limiting the described embodiment to features, elements, and / or steps disclosed herein.

[0126] The methods and apparatuses of this disclosure can be implemented in a number of ways. For example, the methods and apparatuses of this disclosure can be implemented using software, hardware, firmware, or any combination of these. The above described order of steps for the methods is merely illustrative, and the steps of the methods of this disclosure are not limited to the order specifically described above unless otherwise specifically stated. Furthermore, in some embodiments, the disclosure can also be implemented as a program recorded in a recording medium, which includes machine readable instructions for implementing the methods according to the disclosure. Thus, the disclosure also covers a recording medium storing a program for executing the methods according to the disclosure.

[0127] It is also important to note that the devices, equipment, and methods of this disclosure can be embodied in a variety of ways. These variations are contemplated as being within the scope of the present disclosure. Additionally, the various steps of the methods of this disclosure can be carried out in any order or simultaneously, as will be appreciated by those skilled in the art. The above description of the disclosed aspects is meant to be illustrative only and not limiting as to the scope of the disclosure. Various modifications of these aspects, as well as additional aspects, will be apparent to those skilled in the art in view of the foregoing description, and these modifications and additional aspects are intended to fall within the scope of the disclosure. Thus, the disclosure is not intended to be limited to the aspects shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0128] The above description has been given for the purpose of illustration and description. Furthermore, this description does not purport to be exhaustive or to limit the embodiments of the disclosure to the precise forms disclosed. Although various example aspects and embodiments have been discussed above, those of ordinary skill in the art will appreciate a variety of modifications, alternatives, permutations, additions, and sub-combinations, not specifically disclosed herein, that are within the scope of the aspects disclosed herein.

Claims

1. A method for controlling the power frequency temporary overvoltage at the sending end of a DC after a fault, characterized in that The method comprises: collecting first power supply parameters of a direct current sending end power supply connected to a sending end main network, wherein the direct current sending end power supply comprises new energy and conventional power supply other than new energy, and the first power supply parameters comprise new energy output before failure, unit matching capacity and start-up capacity of the conventional power supply; determining a direct current category according to the first power supply parameters, wherein the direct current category comprises pure conventional power supply sending type direct current and wind-fire bundled power supply sending type direct current; when the direct current category is pure conventional power supply sending type direct current, performing fault simulation on the power grid, and determining second power supply parameters and second direct current power of the power grid according to the first power supply parameters of the direct current sending end power supply, a set temporary overvoltage threshold of power frequency, collected post-fault bus transient voltage values and first direct current power according to a set first control strategy, wherein the second power supply parameters and the second direct current power are power supply parameters and direct current power in a case of direct current sending end temporary overvoltage of power frequency generated after the power grid performs direct current bipolar blocking fault simulation; when the direct current category is wind-fire bundled power supply sending type direct current, performing fault simulation on the power grid, and determining third power supply parameters and third direct current power of the power grid according to the first power supply parameters of the direct current sending end power supply, a set temporary overvoltage threshold of power frequency, collected post-fault bus transient voltage values and line transmission direct current power according to a set second control strategy, wherein the third power supply parameters and the third direct current power are power supply parameters and direct current power in a case of direct current sending end temporary overvoltage of power frequency generated after the power grid performs direct current continuous commutation failure fault simulation.

2. The method of claim 1, wherein, The determination of the direct current category according to the first power supply parameters comprises: when the new energy output in the first power supply parameters is equal to 0, determining that the direct current category is pure conventional power supply sending type direct current; when the new energy output in the first power supply parameters is greater than 0, determining that the direct current category is wind-fire bundled power supply sending type direct current.

3. The method of claim 1, wherein, When the direct current category is pure conventional power supply sending type direct current, the first control strategy comprises: In step 301, according to the bus transient voltage value U at the sampling point after the i-th fault, i And the set power frequency temporary overvoltage threshold U max , calculate the busbar transient voltage over-limit value ΔU at the i-th fault point i , and its calculation formula is: ΔU i =U i >-U max wherein i is a natural number; At step 302, when the unit matching capacity CP of the conventional power source other than the new energy is greater than the starting capacity CP0, and ΔU max is greater than 0, CP i =CP0+i*CP i , wherein CP step0 is a pre-set first step value of the starting capacity of the conventional power source, CP0 is the starting capacity of the conventional power source before the fault, CP step0 is the adjusted starting capacity value of the conventional power source other than the new energy determined according to the bus transient voltage value U i at the i th sampling point after the fault, when CP i is greater than CP i , CP max is directly reset to CP i , CP i is equal to CP max , i=i+1, and the process returns to step 301. In step 303, when the unit matching capacity CP of the conventional power source other than the new energy is greater than the starting capacity CPO and ΔU max is greater than 0, it is determined that the second power source parameter of the power grid is the starting capacity CPO of the conventional power source. i When ΔU i is not greater than 0, it is determined that the second power source parameter of the power grid is the unit matching capacity CP of the conventional power source. In step 304, when the unit supporting capacity CP of conventional power sources other than new energy max Equal to the startup capacity CP0, and ΔU i When it is greater than 0, let i=i+1, P i = P 1a -(i-1)*P step0 , return to step 301, where P step0 is the preset first step length value of DC power regulation, P 1a It is the unit supporting capacity CP of conventional power sources other than new energy sources max Equal to the DC power of the grid collected when the power is turned on at capacity CP0, P i It is based on the bus transient voltage value U at the sampling point after the i-1th fault i Determine the DC power value to be adjusted for the power grid; In step 305, when the unit matching capacity of the conventional power source other than the new energy source is equal to the starting capacity CP max , and ΔU i is not greater than 0, the second power grid parameter is determined as the unit matching capacity CP max of the conventional power source, and the second direct current power of the power grid is P i .

4. The method of claim 3, wherein, The method further comprises setting a limit value ΔU for the severity of the power frequency temporary overvoltage following a fault in the power grid min when the power frequency temporary overvoltage is determined to be present. Step 302 is replaced by: When the unit supporting capacity CP of conventional power sources other than new energy max When it is greater than the startup capacity CP0, if 0<ΔU i <ΔU min , let CP i =CP0+i*CP step1 , i=i+1, return to step 301, if ΔU i Not less than ΔU min , let CP i =CP0+i*CP step2 , i=i+1, return to step 301, where CP step1 They are the pre-set second and third step values ​​for normal power on, CP step1 <CP step2 , when CP i Greater than CP max When the CP is reset directly i , so that CP i Equal to CP max ; Step 304 is replaced by: When the unit matching capacity CP of the conventional power source other than the new energy source is equal to the starting capacity CPO, if 0 < ΔU max < ΔU i , let i = i + 1, P min = P i - (i-1) * P 1a , return to step 301, if ΔU step1 is not less than ΔU i , let i = i + 1, P min = P i - (i-1) * P step2 , return to step 301, wherein P step1 is a pre-set DC power adjustment second step value, P step2 is a pre-set DC power adjustment third step value, and P step1 < P step2 .

5. The method of claim 1, wherein, When the direct current category is wind-fire bundled power supply sending type direct current, the second control strategy comprises: In step 501, according to the bus transient voltage value U at the jth sampling point after the fault, j And the set power frequency temporary overvoltage threshold U max , calculate the busbar transient voltage over-limit value ΔU at the jth fault point j , and its calculation formula is: ΔU j =U j -U max wherein j is a natural number; In step 502, when the unit supporting capacity CP of conventional power sources other than new energy max Greater than the startup capacity CP0, and ΔU j When CP is greater than 0, j =CP0+j*CP step3 , when CP j Greater than CP max When the CP is reset directly i , so that CP j Equal to CP max , let j=j+1, return to step 501, where CP step3 It is the fourth step value of the pre-set normal power supply startup. CP0 is the startup capacity of the normal power supply before the fault. CP j It is based on the bus transient voltage value U at the sampling point after the jth fault j The proposed adjusted startup capacity values ​​of conventional power sources other than new energy sources; At step 503, when the unit matching capacity CP of the conventional power source other than the new energy is greater than the starting capacity CPO and ΔU max is greater than 0, it is determined that the third power grid parameter is the starting capacity CPO of the conventional power source. j When ΔU j is not greater than 0, it is determined that the third power grid parameter is the starting capacity CPO of the conventional power source. In step 504, when the unit supporting capacity CP of conventional power sources other than new energy max Equal to the power-on capacity CP0, NP j is greater than 0, and ΔU i When it is greater than 0, let NP j = NP0-j*NP step0 , j=j+1, return to step 501, where NP step0 It is the preset first step value of the new energy output adjustment. NP0 is the new energy output before the fault. NP j It is based on the bus transient voltage value U at the sampling point after the jth fault j The determined grid plans to adjust the new energy output value, NP j The minimum value of is 0; In step 505, when the unit supporting capacity CP of conventional power sources other than new energy max Equal to the power-on capacity CP0, NP j is greater than 0, and ΔU i When it is not greater than 0, the third power source parameter of the power grid is determined to be the unit matching capacity CP of the conventional power source. max and new energy output NP j ; At step 506, when the unit matching capacity CP of the conventional power source other than the new energy source is equal to the starting capacity CP0, NP is equal to 0, and ΔU is greater than 0, let j = j + 1, P = P - (j-1)*P, return to step 501, wherein P is a pre-set fourth step length value of the direct current power adjustment, P is the unit matching capacity CP of the conventional power source other than the new energy source, CP0 is the starting capacity, and P is the grid direct current power collected when CP is equal to CP0 and NP is equal to 0. max j i j 1b step3 step3 1b max j j j is the grid direct current power collected when CP is equal to CP0 and NP is equal to 0. P is the grid direct current power determined according to the bus transient voltage value U of the sampling point after the j-1th fault.​​​​​​​​​​​ In step 507, when the unit matching capacity of the conventional power source other than the new energy source is equal to the starting capacity CP max , NP j is equal to 0, and ΔU i is not greater than 0, the third power grid parameter is determined as the unit matching capacity CP max of the conventional power source, and the third direct current power of the power grid is P j .

6. The method of claim 5, wherein, The method further comprises setting a limit value ΔU for the severity of the power frequency temporary overvoltage following a fault in the power grid min when the power frequency temporary overvoltage is determined to be present. Step 502 is replaced by: When the unit matching capacity CP of the conventional power source other than the new energy is greater than the starting capacity CP0 max When 0 < ΔU i < ΔU min , let CP j = CP0 + j * CP step4 , when ΔU i is not less than ΔU min , let CP j = CP0 + j * CP step5 , when CP j is greater than CP max , directly reset CP i , so that CP i is equal to CP max , let j = j + 1, return to step 501, wherein CP step4 and CP step5 are respectively the fifth and sixth step values of the conventional power source starting capacity preset in advance, and CP step4 < CP step5 ; Step 504 is replaced by: When the unit matching capacity CP of the conventional power source other than the new energy source is equal to the starting capacity CP0, NP max > 0, if 0 < ΔU j < ΔU i < ΔU min , let NP j = NP0-j*NP step1 , if ΔU i is not less than ΔU min , let NP j = NP0-j*NP step2 , and let j = j + 1, return to step 501, wherein NP step1 and NP step2 are a pre-set new energy output adjustment second step value and a third step value, NP step1 < NP step2 ; Step 506 is replaced by: When the unit matching capacity CP of the conventional power source other than the new energy source is equal to the starting capacity CP0, NP max = 0, if 0 < ΔU j = 0, if 0 < ΔU i < ΔU min , let j = j + 1, P j = P 1b - (j - 1) * P step4 , if ΔU i is not less than ΔU min , let j = j + 1, P j = P 1b - (j - 1) * P step5 , return to step 501, wherein P step4 and P step5 are respectively a fifth step length value and a sixth step length value of the direct current power regulation which are set in advance, and P step4 < P step5 .

7. A device for controlling the power frequency temporary overvoltage at the sending end of a DC after a fault, characterized in that The device comprises: The data acquisition module is configured to acquire a first power supply parameter of a direct current sending terminal power supply connected to the sending terminal main grid, wherein the direct current sending terminal power supply includes new energy and conventional power supply other than the new energy, and the first power supply parameter includes new energy output before a fault, unit matching capacity and start-up capacity of the conventional power supply; The power supply type module is configured to determine a direct current category according to the first power supply parameter, wherein the direct current category includes pure conventional power supply sending type direct current and wind-fire bundled power supply sending type direct current; The first control module is configured to, when the direct current category is the pure conventional power supply sending type direct current, perform fault simulation on the power grid, and according to the first power supply parameter of the direct current sending terminal power supply, the acquired post-fault bus transient voltage value and the first direct current power, determine a second power supply parameter and a second direct current power of the power grid according to a set first control strategy, wherein the second power supply parameter and the second direct current power are power supply parameters and direct current powers in a case of a direct current sending terminal power frequency temporary overvoltage after the power grid performs direct current bipolar blocking fault simulation; The second control module is configured to, when the direct current category is the wind-fire bundled power supply sending type direct current, perform fault simulation on the power grid, and according to the first power supply parameter of the direct current sending terminal power supply, the set power frequency temporary overvoltage threshold value, the acquired post-fault bus transient voltage value and the line-transmitted direct current power, determine a third power supply parameter and a third direct current power of the power grid according to a set second control strategy, wherein the third power supply parameter and the third direct current power are power supply parameters and direct current powers in a case of a direct current sending terminal power frequency temporary overvoltage after the power grid performs direct current continuous commutation failure fault simulation.

8. The apparatus of claim 7, wherein, The power supply type module determines the direct current category according to the first power supply parameter, and includes: When the new energy output in the first power supply parameter is equal to 0, it is determined that the direct current category is the pure conventional power supply sending type direct current; When the new energy output in the first power supply parameter is greater than 0, it is determined that the direct current category is the wind-fire bundled power supply sending type direct current.

9. The apparatus of claim 7, wherein, The first control module is configured to, when the direct current category is the pure conventional power supply sending type direct current, perform fault simulation on the power grid, and according to the first power supply parameter of the direct current sending terminal power supply, the acquired post-fault bus transient voltage value and the first direct current power, determine a second power supply parameter and a second direct current power of the power grid according to a set first control strategy, wherein the first control strategy includes: In step 301, according to the bus transient voltage value Ui of the i-th post-fault sampling point and the set power frequency temporary overvoltage threshold value Umax, the bus transient voltage out-of-limit value ΔUi of the i-th post-fault point is calculated, and the calculation formula is: ΔUi=Ui-Umax In the formula, i is a natural number; In step 302, when the unit matching capacity CPmax of the conventional power source other than the new energy source is greater than the starting capacity CP0, and ΔUi is greater than 0, CPi = CP0 + i*CPstep0 is set, wherein CPstep0 is a pre-set first step length value of the starting of the conventional power source, CP0 is the starting capacity of the conventional power source before the fault, CPi is the adjusted starting capacity value of the conventional power source other than the new energy source determined according to the bus transient voltage value Ui of the i-th sampling point after the fault, when CPi is greater than CPmax, CPi is directly reset to be equal to CPmax, i = i + 1 is set, and step 301 is returned to; In step 303, when the unit matching capacity CPmax of the conventional power source other than the new energy source is greater than the starting capacity CP0, and ΔUi is not greater than 0, the second power source parameter of the power grid is determined to be the starting capacity CPi of the conventional power source; In step 304, when the unit matching capacity CPmax of the conventional power source other than the new energy source is equal to the starting capacity CP0, and ΔUi is greater than 0, i = i + 1 is set, Pi = P1a - (i-1)*Pstep0 is set, step 301 is returned to, wherein Pstep0 is a pre-set first step length value of the direct current power adjustment, P1a is the direct current power of the power grid collected when the unit matching capacity CPmax of the conventional power source other than the new energy source is equal to the starting capacity CP0, and Pi is the adjusted direct current power value of the power grid determined according to the bus transient voltage value Ui of the i-1-th sampling point after the fault; In step 305, when the unit matching capacity of the conventional power source other than the new energy source is equal to the starting capacity CPmax, and ΔUi is not greater than 0, the second power source parameter of the power grid is determined to be the unit matching capacity CPmax of the conventional power source, and the second direct current power of the power grid is Pi.

10. The apparatus of claim 9, wherein, The first control module is further used for setting a limit value ΔUmin for distinguishing the severity of the power frequency temporary overvoltage after the power grid fault, wherein: Step 302 is replaced by: When the unit matching capacity CPmax of the conventional power source other than the new energy source is greater than the starting capacity CP0, if 0 < ΔUi < ΔUmin, CPi = CP0 + i*CPstep1 is set, i = i + 1 is set, and step 301 is returned to, if ΔUi is not less than ΔUmin, CPi = CP0 + i*CPstep2 is set, i = i + 1 is set, and step 301 is returned to, wherein CPstep1 is a pre-set second step length value and a third step length value of the starting of the conventional power source, respectively, CPstep1 < CPstep2, and when CPi is greater than CPmax, CPi is directly reset to be equal to CPmax; Step 304 is replaced by: When the unit matching capacity CPmax of the conventional power source other than the new energy source is equal to the starting capacity CP0, if 0 < ΔUi < ΔUmin, let i = i + 1, Pi = P1a-(i-1)*Pstep1, return to step 301, if ΔUi is not less than ΔUmin, let i = i + 1, Pi = P1-(i-1)*Pstep2, return to step 301, wherein Pstep1 is a pre-set second step length value of direct current power adjustment, Pstep2 is a pre-set third step length value of direct current power adjustment, and Pstep1 < Pstep2.

11. The apparatus of claim 7, wherein, The second control module is used for, when the direct current category is a wind-fire bundled power source sending-out type direct current, performing fault simulation on the power grid, and according to the first power source parameter of the direct current sending end power source, the set power frequency temporary overvoltage threshold value, the collected post-fault bus transient voltage value and the line-transmitted direct current power, determining the third power source parameter and the third direct current power of the power grid according to the set second control strategy, wherein the second control strategy comprises: In step 501, according to the bus transient voltage value Uj of the jth post-fault sampling point and the set power frequency temporary overvoltage threshold value Umax, the bus transient voltage out-of-limit value ΔUj of the jth post-fault point is calculated, and the calculation formula is: ΔUj = Uj - Umax In the formula, j is a natural number; In step 502, when the unit matching capacity CPmax of the conventional power source other than the new energy source is greater than the starting capacity CP0, and ΔUj is greater than 0, let CPj = CP0 + j*CPstep3, when CPj is greater than CPmax, directly reset CPi, so that CPj is equal to CPmax, let j = j + 1, and return to step 501, wherein CPstep3 is a pre-set fourth step length value of the starting capacity of the conventional power source, CP0 is the starting capacity of the conventional power source before the fault, and CPj is a tentative adjusted starting capacity value of the conventional power source other than the new energy source determined according to the bus transient voltage value Uj of the jth post-fault sampling point; In step 503, when the unit matching capacity CPmax of the conventional power source other than the new energy source is greater than the starting capacity CP0, and ΔUj is not greater than 0, the third power source parameter of the power grid is determined as the starting capacity CPj of the conventional power source; In step 504, when the unit matching capacity CPmax of the conventional power source other than the new energy source is equal to the starting capacity CP0, NPj is greater than 0, and ΔUi is greater than 0, let NPj = NP0-j*NPstep0, j = j + 1, and return to step 501, wherein NPstep0 is a pre-set first step length value of new energy output adjustment, NP0 is the new energy output before the fault, NPj is a tentative adjusted new energy output value of the power grid determined according to the bus transient voltage value Uj of the jth post-fault sampling point, and the minimum value of NPj is 0. In step 505, when the unit matching capacity CPmax of the conventional power source other than the new energy source is equal to the starting capacity CP0, NPj is greater than 0, and ΔUi is not greater than 0, the third power grid parameter is determined as the unit matching capacity CPmax of the conventional power source and the new energy output NPj. In step 506, when the unit matching capacity CPmax of the conventional power source other than the new energy source is equal to the starting capacity CP0, NPj is equal to 0, and ΔUi is greater than 0, j is set as j+1, Pj is set as P1b-(j-1)*Pstep3, and the step 501 is returned, wherein Pstep3 is a pre-set fourth step length value of direct current power adjustment, P1b is the direct current power of the power grid collected when the unit matching capacity CPmax of the conventional power source other than the new energy source is equal to the starting capacity CP0 and NPj is equal to 0, and Pj is the grid approximate adjusted direct current power value determined according to the bus transient voltage value Uj of the sampling point after the j-1th fault; In step 507, when the unit matching capacity of the conventional power source other than the new energy source is equal to the starting capacity CPmax, NPj is equal to 0, and ΔUi is not greater than 0, the third power grid parameter is determined as the unit matching capacity CPmax of the conventional power source, and the third direct current power of the power grid is Pj.

12. The apparatus of claim 11, wherein, The second control module is further configured to set a limit value ΔUmin for distinguishing the severity of the power frequency temporary overvoltage after the power grid fault, wherein: The step 502 is replaced by: When the unit matching capacity CPmax of the conventional power source other than the new energy source is greater than the starting capacity CP0, if 0<ΔUi<ΔUmin, CPj is set as CP0+j*CPstep4, if ΔUi is not less than ΔUmin, CPj is set as CP0+j*CPstep5, when CPj is greater than CPmax, CPi is directly reset to be equal to CPmax, j is set as j+1, and the step 501 is returned, wherein CPstep4 and CPstep5 are respectively a pre-set fifth step length value and a pre-set sixth step length value of the conventional power source starting, and CPstep4<CPstep5; The step 504 is replaced by: When the unit matching capacity CPmax of the conventional power source other than the new energy source is equal to the starting capacity CP0, and NPj is greater than 0, if 0<ΔUi<ΔUmin, NPj is set as NP0-j*NPstep1, if ΔUi is not less than ΔUmin, NPj is set as NP0-j*NPstep2, and j is set as j+1, and the step 501 is returned, wherein NPstep1 and NPstep2 are respectively a pre-set second step length value and a pre-set third step length value of the new energy output adjustment, and NPstep1<NPstep2; The step 506 is replaced by: When the unit matching capacity CPmax of the conventional power source other than the new energy source is equal to the starting capacity CP0, NPj is equal to 0, if 0 < ΔUi < ΔUmin, j = j + 1, Pj = P1b - (j-1)*Pstep4, if ΔUi is not less than ΔUmin, j = j + 1, Pj = P1b - (j-1)*Pstep5, return to step 501, wherein Pstep4 and Pstep5 are respectively a fifth step length value and a sixth step length value of the direct current power adjustment which are set in advance, and Pstep4 < Pstep5.

13. A computer-readable storage medium, characterized in that, The storage medium stores a computer program, and the computer program is used for executing the method in any one of claims 1 to 6.

14. An electronic device, comprising: The electronic device includes: a processor; a memory for storing executable instructions of the processor; the processor is configured to read the executable instructions from the memory and execute the instructions to implement the method in any one of claims 1 to 6.

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