Time-domain distance protection backup section setting method and system considering influence of new energy boost current

Abstract

The application discloses a time-domain distance protection backup section setting method considering the influence of new energy auxiliary current. The method firstly inputs initial electrical parameters of a power system, and when a metallic single-phase grounding fault occurs at a position of 80% of the length of a downstream line under the minimum operation mode of an upstream synchronous power source, the phase angle difference and amplitude ratio of the auxiliary power source and the output current of the upstream synchronous machine are obtained through short-circuit current calculation. Based on this, the minimum branch coefficient considering the influence of the new energy auxiliary current is calculated by using a specific formula. Furthermore, the backup section setting distance and time limit are determined in combination with a reliable coefficient and a setting value of an adjacent line, and a sensitivity coefficient check is performed. The application quantitatively analyzes the influence of the auxiliary current on the branch coefficient, effectively solves the problem of the difficulty in setting the backup section of the traditional distance protection after the new energy is connected to the power grid, guarantees the sensitivity and reliability of the protection device, and has good engineering application value.

Description

Technical Field

[0001] This invention belongs to the field of power system relay protection, and in particular relates to a setting method and system for the backup section of time-domain distance protection in a new energy power system. Background Technology

[0002] With the rapid development of new power systems, a large number of new energy sources, represented by wind power, photovoltaic power, and energy storage power stations, have been connected to the grid. Due to the randomness and intermittency of new energy power generation, the system operation exhibits strong randomness, weak feedback, and frequency-varying characteristics. Against this backdrop, distance protection based on traditional power frequency phasors faces severe challenges in terms of operating speed, measurement accuracy, and adaptability.

[0003] To address the aforementioned challenges, a fast time-domain distance protection technique based on the weighted accumulation of fitting error has emerged. This method utilizes Euclidean distance to evaluate the least-squares fitting error and uses the reciprocal of the fitting error as a weight to perform a weighted accumulation of historical fitting results. This improvement effectively enhances the convergence speed and stability of the protection, providing an important new solution for the rapid and reliable operation of distance protection in new power systems.

[0004] However, in-depth analysis reveals that, similar to traditional distance protection, the backup section of fast time-domain distance protection is also significantly affected by the boosting current. The boosting current caused by the access of new energy sources can lead to the measured impedance no longer being equal to the actual impedance, resulting in an abnormal expansion or reduction of the protection range. This distance measurement deviation can easily trigger the risk of over-tripping of distance protection, seriously affecting the selectivity of distance protection.

[0005] Currently, existing research on distance protection backup sections lacks quantitative analysis methods for the rapid time-domain distance measurement results considering the impact of boosting current after new energy source integration. The lack of a theoretical basis for accurately assessing the impact of different operating modes and boosting current characteristics on the backup section distance measurement results may lead to an increase or decrease in the protection range, posing a risk of cascading tripping and loss of protection selectivity. Therefore, there is an urgent need to propose a time-domain distance protection backup section II setting method that takes into account the impact of boosting current from new energy sources, providing solid theoretical support and practical guidance for backup section setting. Summary of the Invention

[0006] To address the issue of the deviation between the distance measurement results of the backup section of fast time-domain distance protection and the actual fault distance, which in turn affects the selectivity of the protection, under the influence of branch current, this invention proposes a time-domain distance protection backup section setting method and system that takes into account the influence of renewable energy boosting current. Preliminary distance measurement results are obtained by constructing a time-domain differential equation and solving it using the least squares method. Based on this, the influence factors of branch current on distance measurement accuracy are analyzed. By optimizing the calculation window length to half a cycle to eliminate the influence of the fault initiation time, a simplified branch coefficient independent of the fault initiation time is obtained. The backup section setting value is determined based on this branch coefficient, and the real-time distance measurement results are compared with the setting value to accurately determine whether the fault is within or outside the protection zone and control the operation of the protection device.

[0007] To achieve the above objectives, the present invention employs the following technical solution: In a first aspect, the present invention provides a time-domain distance protection backup section setting method that takes into account the influence of new energy boosting current, comprising the following steps: Step S1: Input the initial electrical parameters of the power system, including line impedance, upstream synchronous power supply voltage, and equivalent rated current of the new energy power station; Step S2: Calculate the phase angle difference θp between the output current of the booster power supply and the output current of the upstream synchronous machine when the downstream line has a metallic single-phase ground fault at 80% of its length, under the minimum operating mode of the upstream synchronous power supply. Step S3: Calculate the ratio of the amplitude of the booster power supply output current to the upstream synchronous machine output current when a metallic single-phase ground fault occurs at 80% of the downstream line length, under the minimum operating conditions of the upstream synchronous power supply. ; Step S4, based on the branch coefficient K br The calculation formula determines the minimum branch coefficient of the time-domain distance protection backup section, taking into account the impact of the new energy boosting current. ; Step S5, based on the minimum branch coefficient Determine the backup setting value of the protection device and perform sensitivity coefficient verification.

[0008] In some embodiments, the branching coefficient determined in step S4 that takes into account the influence of the new energy boosting current... At that time, by optimizing the calculation window length to half a period to eliminate the influence of the fault initiation time, a branch coefficient independent of the fault initiation time is obtained.

[0009] In some embodiments, the branching coefficient determined in step S4 that takes into account the influence of the new energy boosting current... K br The calculation formula is:

[0010] in, , These are the fundamental frequency phasor amplitudes of the output currents of the boosting power supply and the upstream power supply, respectively. θ p To help increase the power supply output current to lead the upstream synchronous machine output current by an angle.

[0011] In some embodiments, determining the backup setting value of the protection device in step S5 includes: Determine the minimum branch coefficient according to the branch coefficient calculation formula. ; Based on the minimum branch coefficient Reliability coefficient And the protection settings of adjacent lines, calculate the backup section setting distance. and setting time limit .

[0012] In some embodiments, in step S5, the backup section setting distance... The calculation formula is:

[0013] in, This is the length of the line. The set distance for adjacent line segment I, The value range is 0.8 to 0.9; The backup segment verification method is as follows: The sensitivity coefficient is:

[0014] For distance segment II, when a short circuit occurs at the end of this line, the measured distance is... x MN Therefore, the sensitivity coefficient is:

[0015] in, K sen ≥1.25.

[0016] When the sensitivity coefficient verification fails to meet the requirements, the protection range is further extended to coordinate with the distance section II of the next line:

[0017] Among them, reliability coefficient Take a value of 0.75 to 0.8, △ t Take a time of 0.2–0.4 s. K br.minThe minimum branch coefficient, K sen ≥1.1.

[0018] In a second aspect, the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, when the processor executes the program, it implements any one of the time-domain distance protection backup segment setting methods that take into account the influence of new energy boosting current.

[0019] Thirdly, a computer-readable storage medium having a computer program stored thereon, characterized in that, when the program is executed by a processor, it implements the time-domain distance protection backup section setting method that takes into account the influence of new energy boosting current as described in any one of the claims.

[0020] This invention addresses the pain points of rapid time-domain distance protection backup section ranging results deviating from the actual fault distance due to the boosting current from renewable energy sources, easily leading to cascading trips and loss of protection selectivity. It obtains preliminary ranging results by constructing a time-domain differential equation and solving it using the least squares method. The invention analyzes the influence of branch current on ranging accuracy, optimizes the calculation window length to half a cycle to eliminate the influence of the fault initiation time, obtains a simplified branch coefficient independent of the fault initiation time, and then determines the backup section setting value based on this branch coefficient. The real-time ranging results are compared with the setting value to accurately determine whether the fault is inside or outside the protection zone. This technical solution achieves quantitative analysis and effective suppression of the impact of renewable energy boosting current, and achieves significant technical effects compared to existing technologies as follows: 1. Enhanced protection selectivity: The backup section setting is based on the simplified branch coefficient, which avoids abnormal expansion or contraction of the protection range caused by the boost current, effectively prevents over-tripping, and ensures the selectivity of the protection.

[0021] 3. Improved reliability and adaptability: The proposed branch coefficient calculation method is applicable to different operating modes and new energy output scenarios, providing a theoretical basis and engineering practice guidance for the reliable operation of the distance protection backup section under the new power system. Attached Figure Description

[0022] Figure 1 This is an overall flowchart of the time-domain distance protection backup section setting method considering the influence of new energy boosting current in Embodiment 1 of the present invention.

[0023] Figure 2 This is a typical topology diagram of a photovoltaic grid-connected system. Detailed Implementation

[0024] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0025] Example 1: As Figure 1 As shown, the time-domain distance protection backup section setting method of the present invention, which takes into account the influence of new energy boosting current, includes the following steps: Step S1: Input the initial electrical parameters of the power system, including line impedance, upstream synchronous power supply voltage, and equivalent rated current of the new energy power station; Step S2: Calculate the phase angle difference θp between the output current of the booster power supply and the output current of the upstream synchronous machine when a metallic single-phase ground fault occurs at 80% of the downstream line length (i.e., at the outlet of section II of the downstream line) under the minimum operating mode of the upstream synchronous power supply. Step S3: Calculate the ratio of the booster power supply output current to the upstream synchronous generator output current when a metallic single-phase ground fault occurs at 80% of the downstream line length (i.e., at the outlet of downstream line section II) under the minimum operating mode of the upstream synchronous power supply. ; Step S4, based on the branch coefficient K br The calculation formula determines the minimum branch coefficient of the time-domain distance protection backup section, taking into account the impact of the new energy boosting current. ; Furthermore, the determined branching coefficient taking into account the influence of new energy-assisted current generation. At that time, by optimizing the calculation window length to half a period to eliminate the influence of the fault initiation time, a branch coefficient independent of the fault initiation time is obtained; The branching coefficient determined in step S4 that takes into account the influence of the new energy boosting current. K br The calculation formula is:

[0026] in, , These are the fundamental frequency phasor amplitudes of the output currents of the boosting power supply and the upstream power supply, respectively. θ p To help increase the power supply output current to lead the upstream synchronous machine output current by an angle; Step S5, based on the minimum branch coefficient Determine the backup setting value of the protection device and perform sensitivity coefficient verification.

[0027] Furthermore, determining the backup setting values ​​for the protection device includes: Determine the minimum branch coefficient according to the branch coefficient calculation formula. ; Based on the minimum branch coefficient Reliability coefficient And the protection settings of adjacent lines, calculate the backup section setting distance. and setting time limit .

[0028] Furthermore, the backup section setting distance The calculation formula is:

[0029] in, This is the length of the line. The set distance for adjacent line segment I, The value range is 0.8 to 0.9; The backup segment verification method is as follows: The sensitivity coefficient is:

[0030] For distance segment II, when a short circuit occurs at the end of this line, the measured distance is... x MN Therefore, the sensitivity coefficient is:

[0031] in, K sen ≥1.25; When the sensitivity coefficient verification fails to meet the requirements, the protection range is further extended to coordinate with the distance section II of the next line:

[0032] Among them, reliability coefficient Take a value of 0.75 to 0.8, △ t Take a time of 0.2–0.4 s. K br.min The minimum branch coefficient, K sen ≥1.1.

[0033] Example 3: A non-transitory computer-readable storage medium storing a computer program, which, when executed by a processor, implements a time-domain distance protection backup segment setting method considering the influence of new energy boosting current, as described in Example 1 of the present invention. The present 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 should 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 device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing device, generate a method for implementing the time-domain distance protection backup segment setting method of the present invention. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0034] Example 4: An electronic device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements a time-domain distance protection backup segment setting method considering the influence of new energy boosting current, as described in Example 1 of the present invention. These computer program instructions may also be stored in a computer-readable storage medium capable of directing a computer or other programmable data processing device to operate in a specific manner, causing the instructions stored in the computer-readable storage medium to 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.

[0035] 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.

[0036] like Figure 2 The diagram shows a typical topology of a grid-connected photovoltaic system with downstream renewable energy feed-in branches. The upstream branch includes an equivalent power source E. m This is a synchronous machine, with photovoltaic (PV) power sources connected to bus N as a new energy booster; the equivalent power source at the far right end is E. x System topology description: Equivalent power source E mA transmission line with impedance P1 and length L1 connects to bus N via bus M; photovoltaic (PV) circuits are directly connected to bus N to form a booster branch; bus N is connected to bus R and remote synchronous power source E via a downstream line with impedance P2 and length d. x ;Fault f It occurred in the line section downstream of bus N at a distance d.

[0037] for Figure 2 The system shown below, taking a single-phase ground fault in the line as an example, is described below as follows: the mathematical relationship between the measured voltage and current at the protection installation point (M) in the time domain.

[0038] 1. Establishment of the initial differential equation: In the time domain, the instantaneous value of the three-phase measured voltage at the protection installation point (M). 、 Three-phase measured instantaneous current value and the instantaneous value of zero-sequence measurement current Satisfy the following differential equations: (1) In the formula, , These are the instantaneous values ​​of the three-phase measured voltage and the instantaneous values ​​of the three-phase measured current at the protection installation location (M). To protect the zero-sequence current value at the installation point (M), The current flowing into the fault point. x This represents the actual distance to the fault. R F For transition resistance, K R and K L These are the zero-sequence compensation coefficients for resistance and inductance, respectively. K R =( r 0 r 1) / 3 r 1, K L =( l 0 l 1) / 3 l 1, r 0 and r 1 represents the zero-sequence resistance and positive-sequence resistance per unit length of the line. l 0 and l 1 represents the zero-sequence inductance and positive-sequence inductance per unit length of the line.

[0039] 2. Equation simplification and approximation: For ease of engineering calculation and solution, the zero-sequence current at this terminal (M) is used.i M0 The current flowing into the fault point is approximately replaced by the current in equation (1). i Fφ That is, satisfying the relation At this point, the original differential equation can be rewritten as: (2) In the formula, The zero-sequence shunt coefficient at the fault point. Indicates the phase (values ​​are A, B, and C). The differential function for measuring current is expressed as follows: , This is the equivalent transition resistance. Due to the fault point current... i Fφ Replaced with zero-sequence current 3 i M0 Transition resistance R F The equivalent transition resistance will also be scaled back accordingly. R F The relationship between the two is ', R F '= R F / K F0 .

[0040] Taking metallic faults as an example (i.e., transition resistance) R F =0), the second term of equation (2) will degenerate to zero, and the equation simplifies to: (3) Suppose that the discretized expressions for the voltage and current measured by the protection system during normal operation are as follows: (4) In the formula, i M This is the current amplitude during normal operation. t The sampling interval is... The phase difference between the three-phase voltage and current is denoted as . A = 0 , B = -120 , C = 120 .

[0041] Since the zero-sequence current is very small during normal operation, the compensation current can be ignored. =0. And replace the differential with the difference, in equation (3) p Mφ It becomes: (5) Substituting equation (4) into equation (5), and taking phase A as an example, i.e. g A = 0, therefore: (6) In the formula: (7) in, ω For system frequency, z 1 represents the positive sequence impedance modulus per unit length of the line. θ 1 represents the positive sequence impedance angle of the line.

[0042] 3. Based on the least squares method, the time-domain differential equation is solved using electrical quantity data within a preset calculation window to obtain preliminary ranging results; The unknowns in this system of equations are solved using the least squares method. x The solution for (i.e., fault distance) is expressed in matrix form as follows: (8) When a single-phase ground fault occurs on the downstream line, set i Mφz To measure the fundamental frequency phasor of the current, and using it as a reference phasor, the measured current in the time domain can then be expressed as: (9) In the formula, I M This is the effective value of the current during normal operation.

[0043] The measured voltage in the time domain can be expressed as:

[0044] (10) In the presence of branch currents, the time-domain distance current differential function can be expressed as: (11) in:

[0045] (12) In the formula, d The distance to the downstream fault. θ pThe angle by which the branch current leads the upstream line current. L 1 represents the length of the upstream line. I Mφ and I Pφ These are the output currents of the upstream power supply and the auxiliary power supply, respectively.

[0046] The protection algorithm cannot detect branch currents; the time-domain distance current differential function can be expressed as: (13) x Given the virtual fault location obtained by the algorithm, combining equations (11) to (13) yields: (14) The preferred method, integral oscillation, is replaced by discrete summation, and its tuning is based on the following: By performing an integral approximation on the discretized time-domain distance calculation formula, the theoretical basis for optimizing the calculation window length is established. The discretized time-domain distance calculation formula can be expanded into equation (13). Here, ∑ represents the summation of data within the least squares calculation window, and the discrete time-domain function is approximated by integral substitution during the derivation process.

[0047]

[0048]

[0049] (15) Let the integral term be expressed as: (16) In the formula, t 0 represents the fault initiation time. t w The window length is calculated using least squares.

[0051] 4. Analyze the influence of branch current on the preliminary ranging result, and determine the factors affecting ranging accuracy. The factors include at least the amplitude ratio and phase angle difference between the output currents of the upstream power supply and the booster power supply, as well as the preset calculation window length and the fault start time. 1. The sub-steps for influencing factor analysis are as follows: Referring to the traditional concept of branch coefficient, let (17) in, KThe distance measurement results are related to factors such as the amplitude ratio and phase angle difference between the output currents of the upstream power supply and the auxiliary power supply, as well as the least squares calculation window length and the fault initiation time. Among these, the amplitude ratio and phase angle difference are determined by the specific fault. Next, this invention analyzes the impact of the window length and the fault initiation time on the distance measurement results.

[0052] 2. Integral Term V m-p The solution steps are as follows: Solving for the integral term V m-p The result is: (18) From the integral result of the above formula, we can obtain that when the window length is... t w As the value approaches infinity, the oscillating terms (sine difference) in the numerator and denominator relative to the linear terms... ωt w Since it is bounded, its contribution is negligible. Therefore, for any sufficiently large integration window length... t w Therefore, it can be seen that the longer the least squares calculation window is, the more stable the output results will be.

[0053] 5. Based on the analysis results of the influencing factors, by optimizing the preset calculation window length to half a period, the influence of the fault initiation time on the ranging result is eliminated, and a simplified branch coefficient independent of the fault initiation time is obtained. The steps for selecting the least squares window length are as follows: The sampling period is typically set between T / 8 and T / 2. As derived above, a longer least squares calculation window results in more stable output; therefore, a window length of T / 2 should be chosen. However, the integration start point must be considered, as the fault initiation time is random. t 0 is random, and when the window length is selected as T / 2, it can achieve immunity to the fault initiation time.

[0054] When the window length is T / 2, we have: (17) at this time V m-p for: (18) That is, the length of the integration interval is exactly one complete period of the cosine function, so the integral of the cosine function is zero over one complete period. (19) at this time V m-p for: (20) The basis for preferably setting the preset calculation window length to half a period is: when the window length... t w When the integral term V is taken as half of the power frequency period T / 2, the calculated integral term V m p Simplified to cos θ p This eliminates the fault initiation time. t The impact of 0, among which, θ p The angle by which the branch current leads the upstream line current.

[0055] 6. Based on the simplified branch coefficient, determine the branch coefficient of the time-domain distance protection backup section that takes into account the influence of the new energy boosting current, and apply the V obtained in step 5. m p =cos θ p Substitute into the branch coefficient expression The time-domain distance protection backup section branch coefficient, taking into account the influence of the new energy boosting current, is obtained:

[0056] This step outputs the branch coefficients; therefore, when the integration window length is selected as T / 2, the time-domain distance protection backup section branch coefficients, taking into account the influence of the new energy boosting current, are as follows: (twenty one) 7. Based on the branch coefficient, determine the backup setting value of the protection device; this step determines the backup setting value, and the setting principle is as follows: Introducing a reliability coefficient for the backup section of fast time-domain distance protection Then the setting distance of the second stage of protection M is: (twenty two) Reliability coefficient Generally, a value of 0.8 to 0.9 is used. Fast time-domain distance protection can typically yield calculation results within tens of milliseconds; therefore, the backup stage Δt can be taken as 0.1 to 0.2 seconds. K br.min This is the minimum branch coefficient.

[0057] Its sensitivity coefficient is: (twenty three) For distance segment II, when a short circuit occurs at the end of this line, the measured distance is... x MN Therefore, the sensitivity coefficient is: (twenty four) General requirementsK sen ≥1.25.

[0058] When the sensitivity coefficient of the verification cannot meet the requirements, the protection range should be further extended to coordinate with the distance section II of the next line.

[0059] (25) Reliability coefficient Generally, it is taken as 0.75 to 0.8, △ t Take a time of 0.2–0.4 s. K br.min To minimize the branch coefficient, it is required that K sen ≥1.1.

[0060] The real-time calculated ranging result is compared with the backup section setting value. If the ranging result is greater than the setting value, it is determined to be an external fault and the protection device does not operate. If the ranging result is less than or equal to the setting value, it is determined to be an internal fault and the protection device operates. The protection device is specifically, for example, a relay protection device.

[0061] The above description is merely an embodiment of the present invention and is not intended to limit the methods proposed in this invention. The scope of protection of this invention is defined by the claims. Any obvious modifications or variations in form and detail made by those skilled in the art without departing from the spirit and scope of this invention should fall within the scope of protection of this invention.

Claims

1. A method for setting the backup section of time-domain distance protection considering the influence of renewable energy boosting current, characterized in that, Includes the following steps: Step S1: Input the initial electrical parameters of the power system, including line impedance, upstream synchronous power supply voltage, and equivalent rated current of the new energy power station; Step S2: Calculate the phase angle difference θp between the output current of the booster power supply and the output current of the upstream synchronous machine when the downstream line has a metallic single-phase ground fault at 80% of its length, under the minimum operating mode of the upstream synchronous power supply. Step S3: Calculate the ratio of the amplitude of the booster power supply output current to the upstream synchronous machine output current when a metallic single-phase ground fault occurs at 80% of the downstream line length, under the minimum operating conditions of the upstream synchronous power supply. ; Step S4, based on the branch coefficient K br The calculation formula determines the minimum branch coefficient of the time-domain distance protection backup section, taking into account the impact of the new energy boosting current. ; Step S5, based on the minimum branch coefficient Determine the backup setting value of the protection device and perform sensitivity coefficient verification.

2. The time-domain distance protection backup section setting method considering the influence of new energy boosting current according to claim 1, characterized in that, The branching coefficient determined in step S4 that takes into account the influence of the new energy boosting current. At that time, by optimizing the calculation window length to half a period to eliminate the influence of the fault initiation time, a branch coefficient independent of the fault initiation time is obtained.

3. The time-domain distance protection backup section setting method considering the influence of new energy boosting current according to claim 1, characterized in that, The branching coefficient determined in step S4 that takes into account the influence of the new energy boosting current. K br The calculation formula is: in, , These are the fundamental frequency phasor amplitudes of the output currents of the boosting power supply and the upstream power supply, respectively. θ p To help increase the power supply output current to lead the upstream synchronous machine output current by an angle.

4. The time-domain distance protection backup section setting method considering the influence of new energy boosting current according to claim 1, characterized in that, In step S5, determining the backup setting value of the protection device includes: Determine the minimum branch coefficient according to the branch coefficient calculation formula. ; Based on the minimum branch coefficient Reliability coefficient In addition to the protection settings of adjacent lines, calculate the backup section setting distance. and setting time limit .

5. The time-domain distance protection backup section setting method considering the influence of new energy boosting current according to claim 1, characterized in that, In step S5, the backup section setting distance The calculation formula is: in, This is the length of the line. The set distance for adjacent line segment I. The value range is 0.8 to 0.9; The backup segment verification method is as follows: The sensitivity coefficient is: For distance segment II, when a short circuit occurs at the end of this line, the measured distance is... x MN Therefore, the sensitivity coefficient is: in, K sen ≥1.25; When the sensitivity coefficient verification fails to meet the requirements, the protection range is further extended to coordinate with the distance section II of the next line: Among them, reliability coefficient Take a value of 0.75~0.8, △ t Take a time of 0.2~0.4s. K br.min The minimum branch coefficient, K sen ≥1.

1.

6. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the time-domain distance protection backup section setting method that takes into account the influence of new energy boosting current as described in any one of claims 1 to 5.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the time-domain distance protection backup section setting method that takes into account the influence of new energy boosting current as described in any one of claims 1 to 5.

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