Networking type energy storage configuration method and device for improving DC commutation failure resistance, and storage medium

Abstract

The invention discloses a network construction type energy storage configuration method and device for improving DC commutation failure resistance and a storage medium, and the method comprises the steps: determining a candidate fault set based on a typical operation mode; selecting a candidate station for bearing the direct current commutation failure; evaluating the sensitivity of configuring the network construction type energy storage when each candidate site faces the candidate fault; and then determining the optimal site of the network construction type energy storage configuration based on the sensitivity. According to the invention, in order to deal with the DC commutation failure risk, the grid-forming type energy storage is configured at the DC receiving end, and a configuration strategy of the grid-forming type energy storage is provided, so that the grid safety and stability of the DC receiving end, especially the extra-high voltage DC receiving end, are greatly improved.

Description

TECHNICAL FIELD

[0001] The application relates to a method and equipment for configuring energy storage to cope with DC commutation failure, in particular to a method and equipment for configuring network-type energy storage to improve the DC commutation failure resistance, and a storage medium. BACKGROUND

[0002] The development of DC technology has played an important role in resource optimization and green power transmission, but at the same time, DC continuous commutation failure has become one of the key problems restricting the safe and stable operation of the power grid. Configuring dynamic reactive power compensation equipment to improve the voltage support capability of the DC receiving end power grid is one of the common commutation failure suppression schemes.

[0003] Compared with the commonly used reactive power compensation equipment, network-type energy storage not only has strong transient voltage support capability, but also can provide strong active power regulation capability, and has wide application prospects. For the problem of DC commutation failure, some scholars have also begun to seek solutions using network-type technology, but so far there is no network-type energy storage configuration method with guiding opinions.

[0004] The application is aimed at the technical characteristics of network-type energy storage, fully utilizes the support of network-type energy storage, and considers the comprehensive effect under different operating modes and different faults, and proposes a network-type energy storage configuration method for improving the DC commutation failure resistance, so as to provide a technical idea for the engineering application of network-type energy storage in the UHV DC feeding area. SUMMARY

[0005] The application aims to provide a network-type energy storage configuration method for improving the DC commutation failure resistance, which can improve the DC short-circuit ratio and dynamic reactive power support capability, reduce the risk of DC continuous commutation failure, and provide support for the application and promotion of network-type energy storage in the UHV DC receiving end power grid. Another purpose of the application is to provide an electronic device and a computer readable storage medium for implementing the method.

[0006] Technical scheme: The network-type energy storage configuration method for improving the DC commutation failure resistance of the application comprises:

[0007] determining a candidate fault set based on a typical operating mode;

[0008] selecting candidate sites for bearing DC commutation failure;

[0009] evaluating the sensitivity of each candidate site to configure network-type energy storage when facing candidate faults in the candidate fault set;

[0010] determining the optimal site for configuring network-type energy storage based on the sensitivity.

[0011] Optionally, the candidate fault set is determined according to the following steps:

[0012] The expected fault set is set according to the power system safety and stability mandatory national standard;

[0013] The time domain simulation is performed on the expected fault set based on the typical mode set, a fault with a continuous commutation failure number greater than a threshold value is taken as a candidate fault, and a candidate fault set is formed; the candidate fault is represented as:

[0014] F _m_j , m = 1, 2, …, M, j = 1, 2, …, J _m

[0015] Wherein, F _m_j represents the candidate fault j under the mth typical operating mode; M is the total number of typical operating modes, and J _m is the total number of candidate faults under the mth typical operating mode.

[0016] Optionally, the threshold value is given according to N = min (N1, N2), wherein N1 is the maximum number of continuous commutation failures that the DC can withstand under the safety constraint of the DC itself device, and N2 is the maximum number of continuous commutation failures that the DC can withstand under the operation requirement of the power grid.

[0017] Optionally, the selection of the candidate sites includes: calculating the equivalent impedance from the DC receiving end converter station node to each node in the power grid, and taking the first H sites with the minimum equivalent impedance as the candidate nodes.

[0018] Optionally, the sensitivity of the configuration of the grid-forming energy storage at each candidate site is evaluated according to the following steps:

[0019] Combined with the time domain simulation result, a sensitivity index of the influence of the configuration of the grid-forming energy storage on the DC commutation failure is constructed;

[0020] According to the occurrence probability of the typical operating mode, the candidate fault occurrence probability and the sensitivity index of the influence of the configuration of the grid-forming energy storage on the DC commutation failure, the sensitivity index of the configuration of the grid-forming energy storage at each candidate site is calculated.

[0021] Optionally, the sensitivity index of the influence of the configuration of the grid-forming energy storage on the DC commutation failure is as follows:

[0022]

[0023] Wherein, S _m_h_j represents the sensitivity index of the influence of the configuration of the grid-forming energy storage on the DC commutation failure when a grid-forming energy storage is configured at the hth site under the mth typical operating mode, and the candidate fault j occurs; K _m_h_j and K′ _m_h_jrespectively, are the number of DC commutation failures when candidate fault j occurs in the mth typical operation mode before and after the configuration of network-forming energy storage; N is the threshold of continuous DC commutation failure number.

[0024] Optionally, the sensitivity index S of each candidate station site configuring network-forming energy storage _h The calculation is performed according to the following formula:

[0025]

[0026] Wherein, P m is the occurrence probability of the typical operation mode m; P j is the occurrence probability of the candidate fault j; M is the total number of typical operation modes; J _m is the total number of candidate faults in the mth typical operation mode; S _m_h_j represents the sensitivity index of the configuration of network-forming energy storage to the influence of DC commutation failure when candidate fault j occurs in the mth typical operation mode at the hth station site.

[0027] Optionally, the optimal station site selection sensitivity index S _h is the maximum station site.

[0028] The electronic device includes a memory, a processor, and a computer program stored on the memory and executable on the processor, and the processor implements part or all of the steps of the above-mentioned network-forming energy storage configuration method for improving the DC commutation failure resistance capability.

[0029] The computer readable storage medium has a computer program stored thereon, and the computer program is executed by the processor to implement part or all of the steps of the above-mentioned network-forming energy storage configuration method for improving the DC commutation failure resistance capability.

[0030] Advantages: Compared with the prior art, the present application has the following significant advantages: for the problem of continuous DC commutation failure under short-circuit fault, the occurrence probability of typical operation mode and fault is considered, the sensitivity of the influence of configuring network-forming energy storage at different station sites on commutation failure is comprehensively evaluated, an optimal configuration station site selection method of network-forming energy storage is proposed, which provides a reference for the configuration of network-forming energy storage at the receiving end of UHVDC, and improves the safe and stable operation level of the receiving end power grid. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 The structural schematic diagram of the present application. DETAILED DESCRIPTION

[0032] The technical solutions of the present application will be further described below with reference to the accompanying drawings.

[0033] AsFigure 1 As shown, the network configuration method for improving the DC commutation failure resistance capability of the energy storage device includes the following steps:

[0034] (1) Based on a typical operating mode, a candidate fault set is determined, including:

[0035] (11) The expected fault set is set according to GB 38755-2019 “Guidelines for Safety and Stability of Power Systems”.

[0036] (12) The expected fault set is scanned based on the typical operating mode, and time-domain simulation is performed.

[0037] (13) The fault that causes continuous DC commutation failure and the number of times is greater than the threshold N is regarded as a candidate fault.

[0038] The candidate fault j under the mth typical operating mode is denoted as F _m_j (m=1, 2,..., M, j=1, 2,..., J _m ); wherein M is the total number of typical operating modes, J _m is the total number of candidate faults under the mth typical operating mode.

[0039] Threshold N=min(N1, N2) wherein N1 is the maximum number of continuous commutation failures that the DC can withstand under the safety constraints of the DC itself, and N2 is the maximum number of continuous commutation failures that the DC can withstand under the operating requirements of the power grid.

[0040] (2) The sensitivity of configuring network energy storage at each candidate site is evaluated, including:

[0041] (21) Select the candidate site for resisting DC commutation failure.

[0042] Calculate the equivalent impedance from the DC receiving end converter station node to each node in the power grid, and select the first H sites with the smallest equivalent impedance as the candidate nodes.

[0043] (22) The sensitivity of configuring network energy storage at each candidate site is evaluated.

[0044] (221) Combine the time-domain simulation results to construct the sensitivity index of configuring network energy storage on the impact of DC commutation failure, that is, under the mth typical operating mode, configure a network energy storage at the hth site, and when the candidate fault j occurs, the sensitivity index S _m_h_j of the configuration of network energy storage on the impact of DC commutation failure. The calculation formula is as follows:

[0045]

[0046] Wherein, K _m_h_j and K′ _m_h_jrespectively, are the number of DC commutation failures when candidate fault j occurs in the mth typical operation mode before and after the configuration of network-type energy storage; N is the threshold of continuous DC commutation failure.

[0047] (222) Considering the occurrence probability of typical operation mode and the fault occurrence probability, the sensitivity index S of each candidate site is calculated h :

[0048]

[0049] Wherein, P m is the occurrence probability of the mth typical operation mode; P j is the occurrence probability of the candidate fault j; M is the total number of typical operation modes; J _m is the total number of candidate faults in the mth typical operation mode; S _m_h_j represents the sensitivity index of the configuration of network-type energy storage to the influence of DC commutation failure when the candidate fault j occurs in the mth typical operation mode at the hth site.

[0050] (3) Determine the optimal site of the configuration of network-type energy storage.

[0051] The site with the maximum comprehensive sensitivity can be selected as the optimal site of the configuration of network-type energy storage.

[0052] The application also provides an electronic device and a computer readable storage medium for implementing the above-mentioned method for improving the DC commutation failure resistance capability of the configuration of network-type energy storage.

[0053] The electronic device comprises a memory, a processor and a computer program stored on the memory and executable on the processor, and the processor implements part or all of the steps of the above-mentioned method for improving the DC commutation failure resistance capability of the configuration of network-type energy storage when executing the program.

[0054] The computer readable storage medium has a computer program stored thereon, and the computer program is executable on the processor to implement part or all of the steps of the above-mentioned method for improving the DC commutation failure resistance capability of the configuration of network-type energy storage.

Claims

1. A network configuration method for improving the DC commutation failure resistance capability of energy storage, characterized in that, The method comprises the following steps: determining a candidate fault set based on typical operation modes; selecting candidate sites for resisting DC commutation failure; evaluating the sensitivity of each candidate site to configure grid-forming energy storage when facing candidate faults in the candidate fault set; determining the optimal site for configuring grid-forming energy storage based on the sensitivity.

2. The network configuration method for improving DC commutation failure resistance capability of the energy storage system according to claim 1, characterized in that, The candidate fault set is determined according to the following steps: setting an expected fault set according to the mandatory national standard for power system security and stability; performing time-domain simulation on the expected fault set based on the typical mode set, regarding the faults with the number of continuous commutation failures greater than a threshold value as candidate faults to form a candidate fault set; the candidate faults are represented as: F _m_j , m = 1, 2,..., M, j = 1, 2,..., J _m where F _m_j represents the candidate fault j under the mth typical operation mode; M is the total number of typical operation modes, J _m is the total number of candidate faults under the mth typical operation mode.

3. The network configuration method for improving DC commutation failure resistance capability of the energy storage system according to claim 2, characterized in that, The threshold value is given according to N = min(N1, N2), wherein N1 is the maximum number of continuous commutation failures that the DC can withstand under the safety constraints of DC devices, and N2 is the maximum number of continuous commutation failures that the DC can withstand under the requirements of power grid operation.

4. The network configuration method for improving DC commutation failure resistance capability of the energy storage system according to claim 1, characterized in that, The selection of the candidate sites comprises: calculating the equivalent impedance from the DC receiving end converter station node to each node in the power grid, and selecting the first H sites with the minimum equivalent impedance as the candidate nodes.

5. The network configuration method for improving DC commutation failure resistance capability of the energy storage system according to claim 1 or 4, characterized in that, The sensitivity of each candidate site to configure grid-forming energy storage is evaluated according to the following steps: combining the time-domain simulation results to build a sensitivity index of the configuration of grid-forming energy storage on the impact of DC commutation failure; calculating the sensitivity index of each candidate site to configure grid-forming energy storage according to the occurrence probability of the typical operation mode, the probability of candidate fault occurrence, and the sensitivity index of the configuration of grid-forming energy storage on the impact of DC commutation failure.

6. The network configuration method for improving DC commutation failure resistance capability of the energy storage system according to claim 5, characterized in that, The sensitivity index of the configuration of grid-forming energy storage on the impact of DC commutation failure is shown in the following formula: wherein S _m_h_j represents the sensitivity index of the configuration of the grid-forming energy storage to the DC commutation failure when the candidate fault j occurs at the hth station under the mth typical operating mode; K _m_h_j and K' _m_h_j are the number of DC commutation failures when the candidate fault j occurs under the mth typical operating mode before and after the configuration of the grid-forming energy storage, respectively; and N is the threshold of the number of continuous DC commutation failures.

7. The network configuration method for improving DC commutation failure resistance capability of the energy storage system according to claim 5, characterized in that, The sensitivity index S of each candidate station configuration to configure the grid-type energy storage _h The calculation is performed according to the following formula: where P m is the probability of occurrence of the typical operating mode m; P j is the probability of occurrence of the candidate fault j; M is the total number of typical operating modes; J _m is the total number of candidate faults under the mth typical operating mode; S _m_h_j represents the sensitivity index of the configuration of the network-forming energy storage at the mth typical operating mode and the hth site to the impact of the configuration of the network-forming energy storage on DC commutation failure when the candidate fault j occurs.

8. The network configuration method for improving DC commutation failure resistance capability of the energy storage system according to claim 7, characterized in that, The optimal station selection sensitivity index S _h The maximum station.

9. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor executes the program to realize the steps of the method for configuring grid-forming energy storage to improve the resistance of DC commutation failure according to any one of claims 1 to 8.

10. A computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to realize the steps of the method for configuring grid-forming energy storage to improve the resistance of DC commutation failure according to any one of claims 1 to 8.

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