A distributed doubly-fed wind turbine aggregation equivalent method, device, equipment and medium

Abstract

The application discloses a kind of distributed doubly-fed fan aggregation equivalence method, device, equipment and medium, based on distributed doubly-fed fan active current calculation coefficient and distributed doubly-fed fan reactive current calculation coefficient, equivalent distributed doubly-fed fan active current calculation coefficient and equivalent distributed doubly-fed fan reactive current calculation coefficient during low voltage ride through are calculated;The equivalent distributed doubly-fed fan active current calculation coefficient and equivalent distributed doubly-fed fan reactive current calculation coefficient are used as the active current and reactive current control parameter of equivalent distributed doubly-fed fan, and the aggregation equivalence of distributed doubly-fed fan is completed.Through the statistical analysis of the total active and reactive characteristics of distributed doubly-fed fan at the key time nodes such as fault removal time, new energy active power maximum point and new energy reactive power inflection point during transient state, the parameters of equivalent doubly-fed fan are calculated, and the characteristics before and after equivalence are kept consistent.

Description

Technical Field

[0001] This invention belongs to the field of power system simulation modeling technology, specifically relating to a distributed doubly fed wind turbine aggregation equivalent method, device, equipment, and medium. Background Technology

[0002] With the continuous increase in wind power output and penetration rate, the safe and stable operation of the power grid will be significantly impacted. In particular, the sudden disconnection of wind turbines from the grid during faults can further deteriorate the grid's operating status, leading to more serious consequences. This problem has frequently occurred in the large-scale development of wind power generation. To ensure stable grid operation, many countries' grid guidelines require new energy grid-connected equipment to possess low-voltage ride-through (LVRT) capabilities. This means that during faults, active or reactive power output should be adjusted according to the voltage drop at the grid connection point, and specific LVRT strategies have been provided. Current research on wind power generation mainly focuses on the detailed modeling of wind power systems, stability analysis of wind farm systems, and equivalent methods for large-scale wind farms. This work provides important technical support for the research and analysis of the grid-connected characteristics of centralized wind power generation and the development of new control methods. However, many 220kV substations are equipped with tens of thousands of distributed wind turbines. It is impossible to model each distributed wind turbine in detail in power system simulation calculations, which would cause the curse of dimensionality. This is especially true for large-scale power system simulations, where the simulation speed and parameter settings cannot meet the requirements.

[0003] To overcome this problem, current power grid simulations use a method that cancels out the power generation of distributed doubly-fed induction generators (DFIGs) below 220kV substations from the load power. This method differs significantly from reality: ① The simulated total load is less than the actual total load; ② The overall load characteristics do not match reality; ③ The impact of the low-voltage ride-through characteristics of DFIGs on power grid stability cannot be accounted for. Simply incorporating DFIGs into the load is clearly unsuitable in areas with high DFIG power generation penetration. Therefore, it is necessary to use a single equivalent DFIG to represent all DFIGs below a 220kV substation. In the past, when performing aggregated equivalent calculations on all distributed doubly-fed induction generators (DFIGs) below a 220kV substation, the active power generated by each DFIG was used as a weighting factor relative to the total active power generated by all DFIGs below the 220kV substation. This approach failed to consider the voltage differences at the DFIG terminals at different grid connection points, as well as the network losses caused by the transient output of the DFIGs flowing through the distribution lines. Consequently, the response characteristics of the aggregated equivalent system in some scenarios differed significantly from the response characteristics of the actual detailed system. Summary of the Invention

[0004] The purpose of this invention is to provide a method, apparatus, equipment, and medium for aggregated equivalent evaluation of distributed doubly-fed induction generators (DFIGs) to solve the problem in the prior art where, when performing aggregated equivalent evaluation of all distributed DFIGs below a 220kV substation, the calculation is performed using the ratio of the active power generated by the distributed DFIGs to the total active power generated by all distributed DFIGs below the entire 220kV substation as a weighting coefficient. This results in a significant difference between the response characteristics of the aggregated equivalent system and the actual detailed system in some scenarios.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A distributed doubly-fed wind turbine aggregation equivalent method includes the following steps:

[0007] Obtain the rated capacity, maximum active power output, maximum reactive power output, and actual active power output of each distributed doubly-fed induction generator (DFIG) in the original detailed system; sum the rated capacity, maximum active power output, maximum reactive power output, and actual active power output of each distributed DFIG in the original detailed system to obtain the rated capacity, maximum active power output, maximum reactive power output, and actual active power output of the equivalent distributed DFIG.

[0008] Obtain the active current calculation coefficient and reactive current calculation coefficient of the distributed doubly-fed induction generator during low voltage ride-through;

[0009] Based on the active current calculation coefficient and reactive current calculation coefficient of the distributed doubly-fed induction generator (DFIG), the equivalent active current calculation coefficient and equivalent reactive current calculation coefficient of the DFIG during the low-voltage ride-through period are calculated. The equivalent active current calculation coefficient and equivalent reactive current calculation coefficient of the DFIG are used as the active current and reactive current control parameters of the equivalent DFIG to complete the aggregation and equivalence of the distributed DFIG.

[0010] As an optional embodiment of the present invention, in the step of calculating the equivalent active current calculation coefficient and equivalent reactive current calculation coefficient of the distributed doubly-fed induction generator (DFIG) during low-voltage ride-through based on the active current calculation coefficient and the reactive current calculation coefficient of the DFIG, the equivalent active current calculation coefficient includes a first equivalent active current calculation coefficient, a second equivalent active current calculation coefficient, and a third equivalent active current calculation coefficient; the equivalent reactive current calculation coefficient includes a first equivalent reactive current calculation coefficient, a second equivalent reactive current calculation coefficient, and a third equivalent reactive current calculation coefficient.

[0011] As an optional embodiment of the present invention, the active current calculation coefficient of the third equivalent distributed doubly-fed wind turbine is calculated by the following formula:

[0012]

[0013] in, _ ,EQ The active current calculation coefficient for the third-equivalent distributed doubly-fed wind turbine; S N,i is the rated capacity of the i-th distributed doubly-fed wind turbine; m is the number of distributed doubly-fed wind turbines in the power distribution area supplied by the 220kV substation; This is the rated capacity of an equivalent distributed doubly-fed wind turbine; Let be the turns ratio of the grid-connected transformer for the i-th distributed doubly-fed wind turbine; Let be the transformer ratio of the i-th distributed doubly-fed wind turbine after it is connected to the grid and then stepped up to the 110kV voltage level; _ i The third active current calculation coefficient is for the i-th distributed doubly-fed wind turbine.

[0014] As an optional solution of the present invention, the active current calculation coefficient of the first equivalent distributed doubly-fed wind turbine is calculated by the following formula:

[0015]

[0016] in, 1_ _ ,EQ The active current calculation coefficient for the first-equivalent distributed doubly-fed wind turbine; Sb This is the system's baseline capacity; This is the rated capacity of an equivalent distributed doubly-fed wind turbine; Let t1 be the active current of the equivalent distributed doubly-fed wind turbine; Let t2 be the equivalent active current of the distributed doubly-fed wind turbine; Let t1 be the per-unit value of the equivalent distributed doubly-fed wind turbine terminal voltage; Let t2 be the per-unit value of the equivalent distributed doubly-fed wind turbine terminal voltage.

[0017] As an optional embodiment of the present invention, the active current calculation coefficient of the second equivalent distributed doubly-fed wind turbine is calculated by the following formula:

[0018]

[0019] in, 2_ _ ，EQ The active current calculation coefficient for the second equivalent distributed doubly-fed wind turbine; The sum of the active currents of each distributed doubly fed wind turbine i collected at time t1 to the 110kV side of the 220kV main transformer; 1_ _ ,EQ The active current calculation coefficient for the first-equivalent distributed doubly-fed wind turbine; Let t1 be the per-unit value of the equivalent distributed doubly-fed wind turbine terminal voltage; Sb This is the system's baseline capacity; This is the rated capacity of an equivalent distributed doubly-fed wind turbine; _ ,EQ The active current calculation coefficient for the third-equivalent distributed doubly-fed wind turbine; This represents the initial active current value of an equivalent distributed doubly-fed wind turbine.

[0020] As an optional embodiment of the present invention, the reactive current calculation coefficient of the first equivalent distributed doubly-fed wind turbine is calculated by the following formula:

[0021]

[0022] The reactive current calculation coefficient of the third equivalent distributed doubly fed wind turbine is calculated by the following formula:

[0023]

[0024] In the above formula, 1_ q_ ,EQ The reactive current calculation coefficient for the first equivalent distributed doubly-fed wind turbine; qset_ ,EQ The reactive current calculation coefficient for the third-equivalent distributed doubly-fed wind turbine; Sb This is the system's baseline capacity; This is the rated capacity of an equivalent distributed doubly-fed wind turbine; Let t1 be the reactive current of the equivalent distributed doubly-fed wind turbine; Let t3 be the reactive current of the equivalent distributed doubly-fed wind turbine; Let t3 be the per-unit value of the equivalent distributed doubly-fed wind turbine terminal voltage; Let t1 be the per-unit value of the terminal voltage of the equivalent distributed doubly-fed wind turbine; To reach the low voltage ride-through threshold.

[0025] As an optional solution of the present invention, after calculating the reactive current calculation coefficient of the third equivalent distributed doubly-fed wind turbine, the correction amount is subtracted from the reactive current calculation coefficient of the third equivalent distributed doubly-fed wind turbine to obtain the final reactive current calculation coefficient of the third equivalent distributed doubly-fed wind turbine.

[0026] A distributed doubly-fed wind turbine aggregation equivalent device includes:

[0027] The first acquisition module is used to acquire the rated capacity, maximum active power output, maximum reactive power output, and actual active power output of each distributed doubly-fed induction generator (DFIG) in the original detailed system; and to sum the rated capacity, maximum active power output, maximum reactive power output, and actual active power output of the distributed DFIG in the original detailed system to obtain the rated capacity, maximum active power output, maximum reactive power output, and actual active power output of the equivalent distributed DFIG.

[0028] The second acquisition module is used to acquire the active current calculation coefficient and reactive current calculation coefficient of the distributed doubly-fed induction generator during low voltage ride-through.

[0029] The first calculation module is used to calculate the equivalent active current calculation coefficient and equivalent reactive current calculation coefficient of the distributed doubly-fed induction generator (DFIG) during low-voltage ride-through based on the active current calculation coefficient and the reactive current calculation coefficient of the DFIG; and to use the equivalent active current calculation coefficient and the equivalent reactive current calculation coefficient of the DFIG as the active current and reactive current control parameters of the equivalent DFIG to complete the aggregation and equivalence of the distributed DFIG.

[0030] An electronic device includes a processor and a memory, the processor being configured to execute a computer program stored in the memory to implement the above-described distributed doubly-fed wind turbine aggregation equivalent method.

[0031] A computer-readable storage medium storing at least one instruction that, when executed by a processor, implements the above-described distributed doubly-fed wind turbine aggregation equivalent method.

[0032] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0033] The distributed doubly-fed induction generator (DFIG) wind turbine aggregation equivalent method provided by this invention takes into account low-voltage ride-through characteristics. Based on the active current calculation coefficient and reactive current calculation coefficient of the DFIG, the equivalent active current calculation coefficient and reactive current calculation coefficient of the DFIG during the low-voltage ride-through period are calculated as the active current control parameters and reactive current control parameters of the equivalent DFIG during the low-voltage ride-through period, thus obtaining the equivalent wind turbine after aggregation equivalent. This method performs transient simulation calculations on the original detailed system (including the 110kV, 35kV, and 10kV distribution networks, reactive power compensation, loads, DFIGs, etc. in the 220kV substation power supply area), and statistically analyzes the total active and reactive characteristics of the DFIG at key time nodes such as the fault clearing time, the maximum active power output of new energy sources, and the inflection point of reactive power output of new energy sources during the transient period, to calculate the parameters of the equivalent DFIG, maintaining consistency of characteristics before and after equivalence. By considering the voltage differences at the terminals of distributed doubly-fed induction generators (DFIGs) at different grid connection points, as well as the network losses caused by the transient output of DFIGs flowing through the distribution lines, the actual dynamic characteristics of tens of thousands of DFIGs in the power grid can be accurately simulated with a single equivalent turbine. This significantly improves the accuracy of power system simulation calculations, while also greatly enhancing the speed and efficiency of power system simulation calculations, providing strong support for high-precision power grid simulation and safe decision-making in production and operation. Attached Figure Description

[0034] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0035] Figure 1 This is a schematic diagram of the wiring of the power supply area of ​​substation A in an embodiment of the present invention.

[0036] Figure 2 This is a schematic diagram showing the value of the reactive current inflection point t3 in an embodiment of the present invention.

[0037] Figure 3This is a schematic diagram of the simulation system in an embodiment of the present invention.

[0038] Figure 4 This is a schematic diagram of the bus voltage curve for the 220kV substation A.

[0039] Figure 5 This is a schematic diagram of the 110kV bus voltage curve for substation A.

[0040] Figure 6 This is a schematic diagram of the active power of the 220kV main transformer connected to the grid at 220kV substation A.

[0041] Figure 7 This is a schematic diagram of the reactive power output of the 220kV main transformer in substation A.

[0042] Figure 8 This is a schematic diagram of the active power output of a doubly fed wind turbine.

[0043] Figure 9 This is a schematic diagram of the reactive power output of a doubly-fed wind turbine.

[0044] Figure 10 This is a schematic diagram of the distributed doubly fed wind turbine aggregation equivalent method of the present invention.

[0045] Figure 11 This is a structural block diagram of a distributed doubly fed wind turbine aggregation equivalent device according to the present invention.

[0046] Figure 12 This is a structural block diagram of an electronic device according to the present invention. Detailed Implementation

[0047] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0048] The following detailed description is exemplary and intended to provide further detailed explanation of the invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention.

[0049] Example 1

[0050] Embodiment 1 of this invention proposes a distributed doubly-fed induction generator (DFIG) wind turbine aggregation equivalent method, taking into account low voltage ride-through characteristics. This method involves analyzing the original detailed system (including the 110kV, 35kV, and 10kV distribution networks, reactive power compensation, loads, and distributed DFIG wind turbines within the 220kV substation power supply area, such as...) Figure 1Transient simulation calculations are performed on the distributed doubly-fed induction generator (DFIG) turbines (DFIGs) during the transient period. Statistical analysis is conducted on the overall active and reactive power characteristics of the DFIGs at key time points such as fault clearing, maximum active power output of renewable energy sources, and inflection point of reactive power output of renewable energy sources. The parameters of the equivalent DFIG turbine are calculated, maintaining consistency in characteristics before and after equivalence. This invention considers the voltage differences at the DFIG terminals of DFIGs at different grid connection points, as well as the network losses caused by the transient output of the DFIGs flowing through the distribution lines. It achieves accurate simulation of the actual dynamic characteristics of tens of thousands of distributed DFIG turbines in the power grid using a single equivalent turbine, improving the accuracy of power system simulation calculations while significantly increasing the speed and efficiency of power system simulation calculations. This provides strong support for high-precision power grid simulation and safe decision-making in production operations.

[0051] like Figure 10 As shown, a distributed doubly-fed wind turbine aggregation equivalent method includes the following steps:

[0052] S1. Obtain the rated capacity, maximum active power output, maximum reactive power output, and actual active power output of each distributed doubly-fed induction generator (DFIG) in the original detailed system; sum the rated capacity, maximum active power output, maximum reactive power output, and actual active power output of each DFIG in the original detailed system to obtain the rated capacity, maximum active power output, maximum reactive power output, and actual active power output of the equivalent DFIG.

[0053] In step S1, the specific calculation methods for the rated capacity, maximum active power output, maximum reactive power output, and actual active power output of the equivalent distributed doubly-fed wind turbine are as follows:

[0054] (1) Calculate the rated capacity of the equivalent distributed doubly fed wind turbine. .

[0055] (1)

[0056] In the formula, S N,i Let m be the rated capacity of the i-th distributed doubly-fed wind turbine, and m be the number of distributed doubly-fed wind turbines in the power distribution area supplied by the 220kV substation.

[0057] (2) Calculate the maximum active power output of the equivalent distributed doubly-fed wind turbine. P max,EQ .

[0058] (2)

[0059] In the formula, P max,i This represents the maximum active power output of the i-th distributed doubly-fed wind turbine.

[0060] (3) Calculate the maximum reactive power output of the equivalent distributed doubly-fed wind turbine. Qmax,EQ .

[0061] (3)

[0062] In the formula, Q max,i Let be the maximum reactive power output of the i-th distributed doubly-fed wind turbine.

[0063] (4) Calculate the actual active power output of the equivalent distributed doubly-fed wind turbine. P EQ .

[0064] (4)

[0065] In the formula, P i This represents the actual active power output of the i-th distributed doubly-fed wind turbine.

[0066] S2. Obtain the active current calculation coefficient and reactive current calculation coefficient of the distributed doubly-fed induction generator during low voltage ride-through.

[0067] In step S2, the active current calculation coefficients for distributed doubly-fed wind turbines include a first active current calculation coefficient, a second active current calculation coefficient, and a third active current calculation coefficient.

[0068] The active current control equation for distributed doubly-fed induction generators during low-voltage ride-through is as follows:

[0069] (5)

[0070] In the formula, 1_ _ This is the calculation coefficient for the first active current; 2_ _ This is the calculation coefficient for the second active current; _ This is the calculation coefficient for the third active current; This refers to the per-unit value of the terminal voltage of a distributed doubly-fed wind turbine. 0 represents the per-unit value of the initial active current of the distributed doubly-fed wind turbine (based on the rated current of the turbine).

[0071] In step S2, the reactive current calculation coefficients for distributed doubly fed wind turbines include a first reactive current calculation coefficient, a second reactive current calculation coefficient, and a third reactive current calculation coefficient.

[0072] The reactive current regulation equation for distributed doubly-fed induction generators during low-voltage ride-through is as follows:

[0073] (6)

[0074] In the formula, 1_ _ The first reactive current calculation coefficient; 2_ _ This is the calculation coefficient for the second reactive current; _ This is the calculation coefficient for the third reactive current; 0 represents the per-unit value of the initial reactive current of the distributed doubly-fed wind turbine; This refers to the per-unit value of the terminal voltage of a distributed doubly-fed wind turbine. To reach the low voltage ride-through threshold.

[0075] It should be noted that in this step S2, the active current calculation coefficient and the reactive current calculation coefficient of the distributed doubly-fed induction generator are both predetermined values.

[0076] S3. Based on the active current calculation coefficient and reactive current calculation coefficient of the distributed doubly-fed induction generator (DFIG), the equivalent active current calculation coefficient and reactive current calculation coefficient of the DFIG during the low voltage ride-through period are calculated.

[0077] The equivalent distributed doubly-fed induction generator (DFIG) active current calculation coefficient includes the first equivalent distributed DFIG active current calculation coefficient, the second equivalent distributed DFIG active current calculation coefficient, and the third equivalent distributed DFIG active current calculation coefficient; the equivalent distributed DFIG reactive current calculation coefficient includes the first equivalent distributed DFIG reactive current calculation coefficient, the second equivalent distributed DFIG reactive current calculation coefficient, and the third equivalent distributed DFIG reactive current calculation coefficient.

[0078] In step S3, the active current calculation coefficient of the first equivalent distributed doubly fed wind turbine ( 1_ _ ,EQ ), and the active current calculation coefficient of the second equivalent distributed doubly fed wind turbine ( 2_ _ ,EQ ) and the active current calculation coefficient of the third equivalent distributed doubly fed wind turbine ( _ ,EQ The calculation method is as follows:

[0079] Step S301, use equation (7) to calculate the active current calculation coefficient of the third equivalent distributed doubly fed wind turbine. _ ,EQ ):

[0080] (7)

[0081] in, _ ,EQ The active current calculation coefficient for the third-equivalent distributed doubly-fed wind turbine; S N,iis the rated capacity of the i-th distributed doubly-fed wind turbine; m is the number of distributed doubly-fed wind turbines in the power distribution area supplied by the 220kV substation; This is the rated capacity of an equivalent distributed doubly-fed wind turbine; Let be the turns ratio (per unit, high voltage side / low voltage side) of the grid-connected transformer for the i-th distributed doubly-fed wind turbine. Let be the turns ratio (per unit, high voltage side / low voltage side) of the transformer that steps up the voltage to 110kV after the i-th distributed doubly fed wind turbine passes through the grid-connected transformer. _ i The third active current calculation coefficient is for the i-th distributed doubly-fed wind turbine.

[0082] Step S302, based on the detailed system simulation results of each distributed doubly-fed wind turbine... The initial active current value of each distributed doubly-fed wind turbine i can be read from the curve. The active current value during the fault clearing time t1 (e.g., if a fault occurs in 1 second and the near-end fault is cleared in 0.09 seconds, then the fault clearing time is 1.09 seconds). Voltage value on the 220kV side of the 220kV main transformer Active power flowing into the 220kV side of the 220kV main transformer and reactive power The moment when the sum of the active currents of all generators i is at its maximum is t2, and the active current values ​​of each generator i at time t2. Voltage value on the 220kV side of the 220kV main transformer Active power flowing into the 220kV side of the 220kV main transformer and reactive power ;

[0083] Step S303: Calculate the initial active current value of the equivalent distributed doubly-fed wind turbine according to equation (8). .

[0084] (8)

[0085] Step S304: Calculate the sum of the active currents of each distributed doubly fed wind turbine i collected at time t1 on the 110kV side of the 220kV main transformer according to equation (9). .

[0086] (9)

[0087] Step S305: Calculate the sum of the active currents of each distributed doubly fed wind turbine i collected at time t2 on the 110kV side of the 220kV main transformer according to equation (10). .

[0088] (10)

[0089] Step S306: Calculate the per-unit value of the equivalent distributed doubly-fed wind turbine terminal voltage at times t1 and t2 using equation (11). and

[0090] (11)

[0091] Among them, U 1,t It is the voltage value of the 220kV side of the 220kV main transformer at time t, P 1,t Let Q be the active power flowing into the 220kV side of the 220kV main transformer at time t. 1,t Let X be the reactive power flowing into the 220kV side of the 220kV main transformer at time t. X = equivalent reactance of the distribution network + reactance of the high- and medium-voltage side of the 220kV main transformer.

[0092] Step S307, according to equation (5), the active current of the equivalent distributed doubly-fed wind turbine at time t1. for:

[0093] (12)

[0094] Step S308, according to equation (5), the active current of the equivalent distributed doubly-fed wind turbine at time t2. for:

[0095] (13)

[0096] Step S309, at time t1, since the active current generated by the equivalent distributed doubly-fed induction generator should be equal to the active current value of the active current generated by each distributed doubly-fed induction generator in the detailed system, which is collected at the 110kV side of the 220kV main transformer, we have:

[0097] (14)

[0098] In step S3010, at time t2, since the active current generated by the equivalent distributed doubly-fed induction generator should be equal to the active current value of the active current generated by each distributed doubly-fed induction generator in the detailed system, which is collected at the 110kV side of the 220kV main transformer, we have:

[0099] (15)

[0100] Step S3011: By combining equations (13)-(15), the active current calculation coefficient of the first equivalent distributed doubly-fed wind turbine can be obtained using equation (16). 1_ _ ，EQ The active current calculation coefficient of the second equivalent distributed doubly-fed wind turbine is obtained using equation (17). 2_ _ ，EQ .

[0101] (16)

[0102] in, 1_ _ ,EQ The active current calculation coefficient for the first-equivalent distributed doubly-fed wind turbine; Sb In this embodiment, as the system baseline capacity, S b The value is 100 MVA; This is the rated capacity of an equivalent distributed doubly-fed wind turbine; Let t1 be the active current of the equivalent distributed doubly-fed wind turbine; Let t2 be the active current of the equivalent distributed doubly-fed wind turbine; Let t1 be the per-unit value of the equivalent distributed doubly-fed wind turbine terminal voltage; Let t2 be the per-unit value of the equivalent distributed doubly-fed wind turbine terminal voltage.

[0103] (17)

[0104] in, 2_ _ ，EQ The active current calculation coefficient for the second equivalent distributed doubly-fed wind turbine; The sum of the active currents of each distributed doubly fed wind turbine i collected at time t1 to the 110kV side of the 220kV main transformer; 1_ _ ,EQ The active current calculation coefficient for the first-equivalent distributed doubly-fed wind turbine; Let t1 be the per-unit value of the equivalent distributed doubly-fed wind turbine terminal voltage; Sb This is the system's baseline capacity; This is the rated capacity of an equivalent distributed doubly-fed wind turbine; _ ,EQ The active current calculation coefficient for the third-equivalent distributed doubly-fed wind turbine; This represents the initial active current value of an equivalent distributed doubly-fed wind turbine.

[0105] In step S3, the reactive current calculation coefficient of the first equivalent distributed doubly fed wind turbine ( 1_ _ ,EQ ), and the reactive current calculation coefficient for the second equivalent distributed doubly-fed wind turbine ( 2_ _ ，EQ ) and the reactive current calculation coefficient of the third equivalent distributed doubly fed wind turbine ( _ ,EQ The calculation method is as follows:

[0106] Step S311, because of the initial reactive current It is 0, so It doesn't work, so set it to 1.

[0107] (18)

[0108] Step S312, from the detailed system simulation results of each generator The reactive current value of each generator i at the fault clearing time t1 (e.g., if a fault occurs at 1 second and the near-end fault is cleared 0.09 seconds later, the fault clearing time is 1.09 seconds) is read from the curve. Voltage value on the 220kV side of the 220kV main transformer Active power flowing into the 220kV side of the 220kV main transformer and reactive power The sum of reactive currents of each generator i rises, then falls, and then rises again at the first inflection point t3 (e.g., Figure 2 (As shown), the voltage value on the 220kV side of the 220kV main transformer. Active power flowing into the 220kV side of the 220kV main transformer and reactive power ;

[0109] Step S313: Calculate the total reactive current of each generator i collected at time t1 on the 110kV side of the 220kV main transformer according to equation (19). .

[0110] (19)

[0111] Step S314: Calculate the sum of the reactive currents of each generator i collected at time t3 on the 110kV side of the 220kV main transformer according to equation (20). .

[0112] (20)

[0113] Step S315: Calculate the equivalent turbine terminal voltage at time t3 using equation (11). .

[0114] Step S316: Calculate the reactive current of the equivalent generator at time t1 according to equation (6). for:

[0115] (twenty one)

[0116] Step S317, according to equation (6), the reactive current of the equivalent generator at time t3. :

[0117] (twenty two)

[0118] Step S318, at time t1, since the reactive current generated by the equivalent generator should be equal to the reactive current value collected by the detailed system at the 110kV side of the 220kV main transformer, we have:

[0119] (twenty three)

[0120] Step S319, at time t3, since the reactive current generated by the equivalent generator should be equal to the reactive current value collected by the detailed system at the 110kV side of the 220kV main transformer, we have:

[0121] (twenty four)

[0122] Step S3110: By combining equations (21)-(24), the reactive current calculation coefficient of the first equivalent distributed doubly-fed wind turbine is obtained using equation (25). 1_ q_ ,EQ The reactive current calculation coefficient of the third equivalent distributed doubly fed wind turbine is obtained using equation (26). qset_ ,EQ .

[0123] (25)

[0124] (26)

[0125] In the above formula, 1_ q_ ,EQ The reactive current calculation coefficient for the first equivalent distributed doubly-fed wind turbine; qset_ ,EQ The reactive current calculation coefficient for the third-equivalent distributed doubly-fed wind turbine; Sb This is the system's baseline capacity; This is the rated capacity of an equivalent distributed doubly-fed wind turbine; Let t1 be the reactive current of the equivalent distributed doubly-fed wind turbine; Let t3 be the reactive current of the equivalent distributed doubly-fed wind turbine; Let t3 be the per-unit value of the equivalent distributed doubly-fed wind turbine terminal voltage; Let t1 be the per-unit value of the terminal voltage of the equivalent distributed doubly-fed wind turbine; To reach the low voltage ride-through threshold.

[0126] Step S3111, in the calculation coefficient of reactive current of the third equivalent distributed doubly fed wind turbine. qset_ ,EQ Increase the correction amount ΔIq generated by the active power.

[0127] In a detailed system, active current generates additional reactive power consumption on the lines. In an equivalent system, this consumption is relatively small. The reactive power output of the distributed doubly-fed induction generator (DFIG) should be reduced to compensate for the reduced reactive power consumption.

[0128] (27)

[0129] In the formula, Let be the active current of the i-th new energy source. This refers to the reactance of the new energy source to the 110kV side busbar of the 220kV main transformer. The reactive current that needs to be reduced for equivalent new energy sources (based on system capacity).

[0130] From equation (27), we can obtain:

[0131] (28)

[0132] To ensure the conservatism of the equivalent system recovery, the current value at the moment when the sum of the active currents of each generator i is at its maximum is selected during the calculation.

[0133] Converted to equivalent machine capacity :

[0134] (29)

[0135] therefore, The value should be corrected to the value calculated by (26). The result calculated by subtracting equation (29) .

[0136] (30)

[0137] S4. Use the equivalent active current calculation coefficient and equivalent reactive current calculation coefficient of the distributed doubly-fed induction generator (DFIG) as the active current and reactive current control parameters of the equivalent DFIG, thus completing the aggregation and equivalence of the DFIG. After aggregation and equivalence, the rated capacity, maximum active power output, maximum reactive power output, and actual active power output of the equivalent DFIG, as well as the active current control parameters and reactive current control parameters, are equal to those before equivalence. This completes the aggregation and equivalence of the DFIG.

[0138] To verify the effectiveness of the distributed doubly-fed induction generator (DFIG) wind turbine aggregation equivalent method proposed in this invention, a 220kV substation A is used as an example for analysis and explanation. There are four distributed DFIG wind turbines in the power supply area of ​​220kV substation A. The rated capacity and active power output information of the four distributed DFIG wind turbines are shown in Table 1, and the control parameters of the four DFIG wind turbines during low-voltage ride-through are shown in Table 2. The wiring diagram of the power supply area of ​​220kV substation A is shown below. Figure 1 As shown.

[0139] Table 1. Power generation of the doubly-fed wind turbine at substation A of 220kV.

[0140]

[0141] Table 2 Control Parameters for Doubly Fed Fan in Substation A During Low-Altitude Circuit Transmission

[0142]

[0143] Based on the detailed statistical data of the distributed doubly-fed wind turbines of substation A, the equivalent power generation of the doubly-fed wind turbines of substation A and the control parameters during the low-voltage period were calculated using the equivalent method of distributed doubly-fed wind turbine aggregation proposed in this invention, as shown in Tables 3 and 4.

[0144] Table 3. Power generation of the equivalent double-fed wind turbine at 220kV substation A.

[0145]

[0146] Table 4. Control Parameters for Equivalent Doubly Fed Wind Turbine A in 220kV Substation During Low-Level Circuit-Through Period

[0147]

[0148] To verify the effectiveness of the proposed equivalent model of distributed doubly-fed induction generator (DFIG) wind turbines considering low-voltage ride-through characteristics, the equivalent model of DFIG wind turbines considering low-voltage ride-through characteristics generated using this method and the original detailed system (including the 110kV and 35kV distribution networks of 220kV substation A, reactive power compensation, loads, and the DFIG system, such as...) were used. Figure 1 Simulation comparison was performed (as shown).

[0149] Simulation systems such as Figure 3 As shown: Generators G1 and G2 supply power to substation A through three circuits and one circuit, respectively.

[0150] Simulation conditions: A three-terminal N-1 fault occurs on the Bus5 side of the Bus 5-Bus6 line, and the faulty line is disconnected 0.12 seconds after the fault occurs.

[0151] The original detailed system of 220kV substation A and below, and the equivalent load model including distributed doubly-fed wind turbines, are respectively connected to... Figure 8 Simulations were performed on Bus6 as shown. The simulated voltage curves of the 220kV bus and 110kV bus at 220kV substation A, as well as the active power, reactive power, and equivalent doubly-fed induction generator terminal voltage, active power output, and reactive power output curves of substation A are shown below. Figure 4~Figure 9 As shown. From Figure 4 It can be seen that the 220kV voltage response curves under the two models are basically the same. Figure 6 and Figure 7 It can be seen that the equivalent model can fit the active and reactive power of the detailed system well. In summary, it can be seen that the model containing the equivalent doubly-fed induction generator (DFIG) can simulate the active and reactive power characteristics of the original system well. This verifies the effectiveness of the distributed DFIG aggregation equivalent method considering low-voltage ride-through characteristics proposed in this invention.

[0152] Example 2

[0153] like Figure 11 As shown, based on the same inventive concept as Embodiment 1, Embodiment 2 also provides a distributed doubly-fed wind turbine aggregation equivalent device, specifically including:

[0154] The first acquisition module is used to acquire the rated capacity, maximum active power output, maximum reactive power output, and actual active power output of each distributed doubly-fed induction generator (DFIG) in the original detailed system; and to sum the rated capacity, maximum active power output, maximum reactive power output, and actual active power output of the distributed DFIG in the original detailed system to obtain the rated capacity, maximum active power output, maximum reactive power output, and actual active power output of the equivalent distributed DFIG.

[0155] In the first acquisition module, the specific calculation methods for the rated capacity, maximum active power output, maximum reactive power output, and actual active power output of the equivalent distributed doubly-fed wind turbine are as follows:

[0156] Calculate the rated capacity of the equivalent distributed doubly-fed wind turbine. .

[0157]

[0158] In the formula, S N,i Let m be the rated capacity of the i-th distributed doubly-fed wind turbine, and m be the number of distributed doubly-fed wind turbines in the power distribution area supplied by the 220kV substation.

[0159] Calculate the maximum active power output of the equivalent distributed doubly-fed wind turbine. P max,EQ .

[0160]

[0161] In the formula, P max,i This represents the maximum active power output of the i-th distributed doubly-fed wind turbine.

[0162] Calculate the maximum reactive power output of the equivalent distributed doubly-fed wind turbine. Q max,EQ .

[0163]

[0164] In the formula, Q max,i Let be the maximum reactive power output of the i-th distributed doubly-fed wind turbine.

[0165] Calculate the actual active power output of the equivalent distributed doubly-fed wind turbine. P EQ .

[0166]

[0167] In the formula, P i This represents the actual active power output of the i-th distributed doubly-fed wind turbine.

[0168] The second acquisition module is used to acquire the active current calculation coefficient and reactive current calculation coefficient of the distributed doubly-fed induction generator during low voltage ride-through.

[0169] The first calculation module is used to calculate the equivalent active current calculation coefficient and equivalent reactive current calculation coefficient of the distributed doubly-fed induction generator (DFIG) during low voltage ride-through, based on the active current calculation coefficient and the reactive current calculation coefficient of the DFIG.

[0170] The second calculation module is used to calculate the active current control parameters and reactive current control parameters of the equivalent distributed doubly-fed induction generator (DFIG) during low voltage ride-through, based on the active current calculation coefficient and the reactive current calculation coefficient of the equivalent distributed DFIG.

[0171] In the second calculation module, the active current calculation coefficient of the third equivalent distributed doubly-fed wind turbine is calculated using the following formula:

[0172]

[0173] in, _ ,EQ The active current calculation coefficient for the third-equivalent distributed doubly-fed wind turbine; S N,i is the rated capacity of the i-th distributed doubly-fed wind turbine; m is the number of distributed doubly-fed wind turbines in the power distribution area supplied by the 220kV substation; This is the rated capacity of an equivalent distributed doubly-fed wind turbine; Let be the turns ratio of the grid-connected transformer for the i-th distributed doubly-fed wind turbine; Let be the transformer ratio of the i-th distributed doubly-fed wind turbine after it is connected to the grid and then stepped up to the 110kV voltage level; _ i The third active current calculation coefficient is for the i-th distributed doubly-fed wind turbine.

[0174] The active current calculation factor for the first-value distributed doubly-fed wind turbine is calculated using the following formula:

[0175]

[0176] in, 1_ _ ,EQ The active current calculation coefficient for the first-equivalent distributed doubly-fed wind turbine; Sb This is the system's baseline capacity; This is the rated capacity of an equivalent distributed doubly-fed wind turbine; Let t1 be the active current of the equivalent distributed doubly-fed wind turbine; Let t2 be the equivalent active current of the distributed doubly-fed wind turbine; Let t1 be the per-unit value of the equivalent distributed doubly-fed wind turbine terminal voltage; Let t2 be the per-unit value of the equivalent distributed doubly-fed wind turbine terminal voltage.

[0177] The active current calculation factor for the second-equivalent distributed doubly-fed wind turbine is calculated using the following formula:

[0178]

[0179] in, 2_ _ ，EQ The active current calculation coefficient for the second equivalent distributed doubly-fed wind turbine; The active current of the distributed doubly fed wind turbine i at time t1 is the sum of the current collected at the 110kV side of the 220kV main transformer. 1_ _ ,EQ The active current calculation coefficient for the first-equivalent distributed doubly-fed wind turbine; Let t1 be the per-unit value of the equivalent distributed doubly-fed wind turbine terminal voltage; Sb This is the system's baseline capacity; This is the rated capacity of an equivalent distributed doubly-fed wind turbine; _ ,EQ The active current calculation coefficient for the third-equivalent distributed doubly-fed wind turbine; This represents the initial active current value of an equivalent distributed doubly-fed wind turbine.

[0180] The reactive current calculation factor for the first equivalent distributed doubly-fed wind turbine is calculated using the following formula:

[0181]

[0182] The reactive current calculation factor for the third-value distributed doubly-fed wind turbine is calculated using the following formula:

[0183]

[0184] In the above formula, 1_ q_ ,EQ The reactive current calculation coefficient for the first equivalent distributed doubly-fed wind turbine; qset_ ,EQ The reactive current calculation coefficient for the third-equivalent distributed doubly-fed wind turbine; Sb This is the system's baseline capacity; This is the rated capacity of an equivalent distributed doubly-fed wind turbine; Let t1 be the reactive current of the equivalent distributed doubly-fed wind turbine; Let t3 be the reactive current of the equivalent distributed doubly-fed wind turbine; Let t3 be the per-unit value of the equivalent distributed doubly-fed wind turbine terminal voltage; Let t1 be the per-unit value of the terminal voltage of the equivalent distributed doubly-fed wind turbine; To reach the low voltage ride-through threshold.

[0185] The module is used to combine the rated capacity, maximum active power output, maximum reactive power output, and actual active power output of the equivalent distributed doubly-fed wind turbine, as well as the active current control parameters and reactive current control parameters of the equivalent distributed doubly-fed wind turbine during low voltage ride-through, to obtain the aggregated equivalent wind turbine.

[0186] Example 3

[0187] like Figure 12 As shown, the present invention also provides an electronic device 100 for implementing the distributed doubly-fed induction generator (DFIG) aggregation equivalent method of Embodiment 1. The electronic device 100 includes a memory 101, at least one processor 102, a computer program 103 stored in the memory 101 and executable on the at least one processor 102, and at least one communication bus 104. The memory 101 can be used to store the computer program 103. The processor 102 implements the steps of the distributed DFIG aggregation equivalent method of Embodiment 1 by running or executing the computer program stored in the memory 101 and by calling data stored in the memory 101.

[0188] The memory 101 may primarily include a program storage area and a data storage area. The program storage area may store the operating system, application programs required for at least one function (such as sound playback function, image playback function, etc.), etc.; the data storage area may store data created based on the use of the electronic device 100 (such as audio data), etc. In addition, the memory 101 may include non-volatile memory, such as hard disk, RAM, plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, at least one disk storage device, flash memory device, or other non-volatile solid-state storage device.

[0189] At least one processor 102 may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. Processor 102 may be a microprocessor or any conventional processor. Processor 102 is the control center of electronic device 100, connecting various parts of electronic device 100 via various interfaces and lines.

[0190] The memory 101 in the electronic device 100 stores multiple instructions to implement a distributed doubly-fed wind turbine aggregation equivalent method, and the processor 102 can execute multiple instructions to achieve the following:

[0191] Obtain the rated capacity, maximum active power output, maximum reactive power output, and actual active power output of all distributed doubly-fed induction generators and sum them separately to obtain the rated capacity, maximum active power output, maximum reactive power output, and actual active power output of the equivalent distributed doubly-fed induction generators.

[0192] Obtain the active current calculation coefficient and reactive current calculation coefficient of the distributed doubly-fed induction generator during low voltage ride-through;

[0193] Based on the active current calculation coefficient and reactive current calculation coefficient of the distributed doubly-fed induction generator (DFIG), the equivalent active current calculation coefficient and reactive current calculation coefficient of the DFIG during the low voltage ride-through period are calculated.

[0194] Based on the active current calculation coefficient and reactive current calculation coefficient of the equivalent distributed doubly-fed induction generator (DFIG), the active current control parameters and reactive current control parameters of the equivalent distributed DFIG during low-voltage ride-through are calculated.

[0195] Example 4

[0196] If the modules / units integrated in the electronic device 100 are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, and read-only memory (ROM).

[0197] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0198] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0199] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0200] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0201] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for aggregated equivalent values ​​of distributed doubly-fed wind turbines, characterized in that, Includes the following steps: Obtain the rated capacity, maximum active power output, maximum reactive power output, and actual active power output of each distributed doubly-fed induction generator (DFIG) in the original detailed system; sum the rated capacity, maximum active power output, maximum reactive power output, and actual active power output of each distributed DFIG in the original detailed system to obtain the rated capacity, maximum active power output, maximum reactive power output, and actual active power output of the equivalent distributed DFIG. Obtain the active current calculation coefficient and reactive current calculation coefficient of the distributed doubly-fed induction generator during low voltage ride-through; Based on the active current calculation coefficient and reactive current calculation coefficient of the distributed doubly-fed induction generator (DFIG), the equivalent active current calculation coefficient and reactive current calculation coefficient of the DFIG during the low voltage ride-through period are calculated. The equivalent distributed doubly-fed induction generator (DFIG) active current calculation coefficient and equivalent distributed doubly-fed induction generator (DFIG) reactive current calculation coefficient are used as the active current and reactive current control parameters of the equivalent distributed DFIG to complete the aggregation and equivalence of the distributed DFIG. The equivalent distributed DFIG active current calculation coefficient includes a first equivalent distributed DFIG active current calculation coefficient, a second equivalent distributed DFIG active current calculation coefficient, and a third equivalent distributed DFIG active current calculation coefficient. The equivalent distributed DFIG reactive current calculation coefficient includes a first equivalent distributed DFIG reactive current calculation coefficient, a second equivalent distributed DFIG reactive current calculation coefficient, and a third equivalent distributed DFIG reactive current calculation coefficient. The active current calculation factor for the third-value distributed doubly-fed wind turbine is calculated using the following formula: in, _ ,EQ The active current calculation coefficient for the third-equivalent distributed doubly-fed wind turbine; S N,i Let m be the rated capacity of the i-th distributed doubly-fed wind turbine; m is the number of distributed doubly-fed wind turbines. This is the rated capacity of an equivalent distributed doubly-fed wind turbine; Let be the turns ratio of the grid-connected transformer for the i-th distributed doubly-fed wind turbine; Let be the transformer ratio of the i-th distributed doubly-fed wind turbine after it is connected to the grid and then stepped up to the 110kV voltage level; _ i The third active current calculation coefficient for the i-th distributed doubly-fed wind turbine; The active current calculation factor for the first-value distributed doubly-fed wind turbine is calculated using the following formula: in, 1_ _ ,EQ The active current calculation coefficient for the first-equivalent distributed doubly-fed wind turbine; Sb This is the system's baseline capacity; This is the rated capacity of an equivalent distributed doubly-fed wind turbine; Let t1 be the active current of the equivalent distributed doubly-fed wind turbine; Let t2 be the equivalent active current of the distributed doubly-fed wind turbine; Let t1 be the per-unit value of the equivalent distributed doubly-fed wind turbine terminal voltage; Let t2 be the per-unit value of the equivalent distributed doubly-fed wind turbine terminal voltage; The active current calculation factor for the second-equivalent distributed doubly-fed wind turbine is calculated using the following formula: in, 2_ _ ，EQ The active current calculation coefficient for the second equivalent distributed doubly-fed wind turbine; The sum of the active currents of each distributed doubly fed wind turbine i collected at time t1 to the 110kV side of the 220kV main transformer; 1_ _ ,EQ The active current calculation coefficient for the first-equivalent distributed doubly-fed wind turbine; Let t1 be the per-unit value of the equivalent distributed doubly-fed wind turbine terminal voltage; Sb This is the system's baseline capacity; This is the rated capacity of an equivalent distributed doubly-fed wind turbine; _ ,EQ The active current calculation coefficient for the third-equivalent distributed doubly-fed wind turbine; This represents the initial active current value of an equivalent distributed doubly-fed wind turbine. The reactive current calculation factor for the first equivalent distributed doubly-fed wind turbine is calculated using the following formula: The reactive current calculation factor for the third-value distributed doubly-fed wind turbine is calculated using the following formula: In the above formula, 1_ q_ ,EQ The reactive current calculation coefficient for the first equivalent distributed doubly-fed wind turbine; qset_ ,EQ The reactive current calculation coefficient for the third-equivalent distributed doubly-fed wind turbine; Sb This is the system's baseline capacity; This is the rated capacity of an equivalent distributed doubly-fed wind turbine; Let t1 be the reactive current of the equivalent distributed doubly-fed wind turbine; Let t3 be the reactive current of the equivalent distributed doubly-fed wind turbine; Let t3 be the per-unit value of the equivalent distributed doubly-fed wind turbine terminal voltage; Let t1 be the per-unit value of the terminal voltage of the equivalent distributed doubly-fed wind turbine; To reach the low voltage ride-through threshold; The reactive current calculation coefficient for the second equivalent distributed doubly fed wind turbine is 1.

2. The distributed doubly-fed wind turbine aggregation equivalent method according to claim 1, characterized in that, After calculating the reactive current calculation coefficient of the third equivalent distributed doubly-fed wind turbine, the correction amount is subtracted from the reactive current calculation coefficient of the third equivalent distributed doubly-fed wind turbine to obtain the final reactive current calculation coefficient of the third equivalent distributed doubly-fed wind turbine.

3. A distributed doubly-fed induction generator (DFIG) wind turbine aggregation equivalent device, used to implement the distributed DFIG wind turbine aggregation equivalent method as described in claim 1, characterized in that, include: The first acquisition module is used to acquire the rated capacity, maximum active power output, maximum reactive power output and actual active power output of each distributed doubly fed wind turbine in the original detailed system; The rated capacity, maximum active power output, maximum reactive power output, and actual active power output of the distributed doubly-fed wind turbines in the original detailed system are summed to obtain the equivalent rated capacity, maximum active power output, maximum reactive power output, and actual active power output of the distributed doubly-fed wind turbines. The second acquisition module is used to acquire the active current calculation coefficient and reactive current calculation coefficient of the distributed doubly-fed induction generator during low voltage ride-through. The first calculation module is used to calculate the equivalent active current calculation coefficient and the equivalent reactive current calculation coefficient of the distributed doubly-fed induction generator (DFIG) during the low voltage ride-through period based on the active current calculation coefficient and the reactive current calculation coefficient of the DFIG. The active current calculation coefficient and reactive current calculation coefficient of the equivalent distributed doubly-fed wind turbine are used as the active current and reactive current control parameters of the equivalent distributed doubly-fed wind turbine to complete the aggregation and equivalence of the distributed doubly-fed wind turbine.

4. An electronic device, characterized in that, It includes a processor and a memory, the processor being used to execute a computer program stored in the memory to implement the distributed doubly fed wind turbine aggregation equivalent method as described in claim 1 or 2.

5. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores at least one instruction that, when executed by a processor, implements the distributed doubly fed wind turbine aggregation equivalent method as described in claim 1 or 2.

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