A frequency stability level evaluation method and system for a new energy power system

Abstract

The application discloses a frequency stability level evaluation method and system of a new energy power system, comprising: obtaining the moment of inertia of all generator units in the new energy power system; in a preset time scale range, a single disturbance power impact is applied to the new energy power system for multiple times to obtain multiple power disturbance amounts corresponding to the new energy power system in real time, and the moment of inertia and the power disturbance amounts are combined to analyze multiple frequency change rates corresponding to the new energy power system; according to a preset screening rule, the system confidence frequency change rate of the new energy power system is determined according to all the frequency change rates to complete the frequency stability level evaluation of the new energy power system. In the case that the power generation level of the new energy power system changes with weather conditions, the single disturbance power impact is applied to the system for multiple times in the preset time scale range, the system frequency stability level in a long time scale is analyzed and evaluated, and the evaluation accuracy is improved.

Description

Technical Field

[0001] This invention relates to the field of performance evaluation technology for new energy power systems, and in particular to a method and system for evaluating the frequency stability level of new energy power systems. Background Technology

[0002] In renewable energy power systems, the large-scale integration of renewable energy sources has replaced some of the synchronous machines in the original synchronous grid, altering the characteristics and form of system inertia. This low inertia problem changes the system's frequency characteristics. The most direct impact is that when the power system experiences generator disconnection, DC transmission channel failure, or significant load changes, it relies on the release / storage of rotor kinetic energy from all grid generators to achieve short-term electromagnetic power supply and demand balance. Wind turbines, however, lack this rotor kinetic energy storage and release process, resulting in insufficient rotational kinetic energy across the entire grid. This objectively manifests as rapid changes in grid frequency, reducing the system's ability to resist unbalanced power disturbances, and making the system frequency more prone to exceeding limits and triggering rapid generator / load shedding. Therefore, measuring the system's ability to resist unbalanced power disturbances provides a reference for planners and operators, and is of great significance for the planning, construction, and safe and stable operation of renewable energy-integrated power systems.

[0003] However, after new energy sources are connected to the power system, the power generation level of these new energy sources changes constantly with the weather conditions, causing the frequency stability level of the power system to change significantly over time. This makes it impossible to comprehensively measure the frequency stability level of the power system over a long time scale, i.e., it is impossible to comprehensively measure the power system's ability to resist unbalanced power disturbances over a long time scale. Summary of the Invention

[0004] This invention provides a method and system for assessing the frequency stability level of a new energy power system, which improves the accuracy of assessing the frequency stability level of the new energy power system when the power generation level of the new energy power system changes constantly with weather conditions.

[0005] To address the aforementioned technical problems, embodiments of the present invention provide a method for assessing the frequency stability level of a new energy power system, comprising:

[0006] Obtain the rotational inertia of all generator sets in the new energy power system;

[0007] Within a preset time scale, a single disturbance power impact is applied to the new energy power system multiple times to obtain multiple power disturbance quantities corresponding to the new energy power system in real time. Combined with the moment of inertia and each of the power disturbance quantities, multiple frequency change rates corresponding to the new energy power system are analyzed and obtained.

[0008] According to the preset screening rules, the system confidence frequency change rate of the new energy power system is determined based on all the frequency change rates, so as to complete the assessment of the frequency stability level of the new energy power system.

[0009] The power disturbance corresponds one-to-one with the frequency change rate.

[0010] By implementing embodiments of the present invention, a single disturbance power impact is applied to the new energy power system multiple times within a preset time scale to obtain multiple power disturbance quantities of the new energy power system. Based on the rotational inertia of all generator sets in the system and all power disturbance quantities, the system confidence frequency change rate of the new energy power system is determined. This enables the analysis and measurement of the system's ability to resist unbalanced power disturbances over a long time scale, even when the power generation level of the new energy power system changes constantly with weather conditions, and improves the accuracy of the assessment of the frequency stability level of the new energy power system.

[0011] As a preferred embodiment, the step of determining the system confidence frequency change rate of the new energy power system according to a preset screening rule and based on all the frequency change rates, in order to complete the frequency stability level assessment of the new energy power system, specifically involves:

[0012] Arrange all the frequency change rates in descending order;

[0013] According to the arrangement results, the frequency change rate at the preset position is taken as the system confidence frequency change rate of the new energy power system, and the quantile value corresponding to the preset position is used to characterize the probability that each frequency change rate of the new energy power system is greater than the system confidence frequency change rate, so as to complete the assessment of the frequency stability level of the new energy power system.

[0014] In a preferred embodiment of the present invention, the frequency change rate at a preset position in the arrangement results is taken as the system confidence frequency change rate of the new energy power system to obtain the frequency stability level assessment result of the new energy power system. Specifically, the probability that the frequency change rate of the new energy power system is greater than the system confidence frequency change rate is the quantile value corresponding to the preset position in the arrangement results, so that the grid operation and management personnel can analyze the stability of the grid system.

[0015] As a preferred embodiment, within a preset time scale, a single disturbance power impact is applied to the new energy power system multiple times to obtain multiple power disturbance quantities corresponding to the new energy power system in real time. Combined with the moment of inertia and each of the power disturbance quantities, multiple frequency change rates corresponding to the new energy power system are analyzed and obtained. Specifically:

[0016] At multiple detection moments within a preset time scale, a single disturbance power impact is applied to the new energy power system to obtain multiple power disturbance quantities corresponding to the new energy power system in real time.

[0017] According to the preset frequency change rate algorithm, multiple frequency change rates corresponding to the new energy power system are calculated based on the moment of inertia and each of the power disturbances.

[0018] The detection time corresponds one-to-one with the power disturbance amount, and the time interval between each detection time is equal.

[0019] In a preferred embodiment of the present invention, a single disturbance power impact is applied to the new energy power system at multiple equally spaced detection times within a preset time scale to obtain the power disturbance amount of the new energy power system at different times. Based on the rotational inertia of all generator sets in the new energy power system and the power disturbance amount at all different times, multiple frequency change rates corresponding to the new energy power system are analyzed to reflect the sensitivity of the new energy power system to the single disturbance power impact at different times.

[0020] As a preferred embodiment, obtaining the rotational inertia of all generator sets in the new energy power system specifically involves:

[0021] Obtain the inertial constant and the operating capacity of each generator set in the new energy power system;

[0022] The moment of inertia is calculated according to the preset rotational inertia algorithm, based on the inertia constant of each generator set and the operating capacity of each generator set.

[0023] In a preferred embodiment of the present invention, after new energy sources are connected to the power system, if the new energy power system experiences generator disconnection, DC transmission channel failure, or significant load changes, it is necessary to rely on the release / storage of rotor kinetic energy from all generator sets in the system to achieve short-term electromagnetic power supply and demand balance. At this time, wind turbines basically do not have a rotor kinetic energy storage and release process, resulting in insufficient rotational kinetic energy of all generator sets in the system. This situation is objectively reflected as a rapid change in system frequency. Therefore, based on the inertia constant and operating capacity of each generator set, the rotational inertia of all generator sets in the system can be calculated, which can provide data support for subsequent analysis and evaluation of the frequency stability level of the new energy power system.

[0024] As a preferred embodiment, the single disturbance power impact includes DC bipolar blocking, tripping of parallel double-circuit AC transmission lines, and tripping of the two generator sets with the largest capacity in a single plant.

[0025] In implementing the preferred embodiment of the present invention, when a single disturbance power impact such as DC bipolar blocking, tripping of parallel double-circuit AC transmission lines, or tripping of the two generator units with the largest capacity in a single plant is applied to the new energy power system, the new energy power system will experience abnormal situations such as generator disconnection from the grid, DC transmission channel failure, or significant load changes, so as to analyze and evaluate the frequency stability level of the system.

[0026] To address the same technical problem, embodiments of the present invention also provide a frequency stability level assessment system for a new energy power system, comprising:

[0027] The data acquisition module is used to acquire the rotational inertia of all generator sets in the new energy power system.

[0028] The disturbance application module is used to apply a single disturbance power impact to the new energy power system multiple times within a preset time scale range, so as to obtain multiple power disturbance quantities corresponding to the new energy power system in real time, and analyze and obtain multiple frequency change rates corresponding to the new energy power system by combining the moment of inertia and each of the power disturbance quantities; wherein, the power disturbance quantity corresponds one-to-one with the frequency change rate.

[0029] The evaluation module is used to determine the system confidence frequency change rate of the new energy power system according to preset screening rules and based on all the frequency change rates, so as to complete the evaluation of the frequency stability level of the new energy power system.

[0030] As a preferred embodiment, the evaluation module specifically includes:

[0031] A sorting unit is used to arrange all the frequency change rates in descending order;

[0032] An evaluation unit is used to determine the frequency change rate of the new energy power system based on the arrangement results, using the frequency change rate at a preset position as the system confidence frequency change rate, and using the quantile value corresponding to the preset position to characterize the probability that each frequency change rate of the new energy power system is greater than the system confidence frequency change rate, so as to complete the evaluation of the frequency stability level of the new energy power system.

[0033] As a preferred embodiment, the disturbance application module specifically includes:

[0034] The disturbance application unit is used to apply a single disturbance power impact to the new energy power system at multiple detection times within a preset time scale range, so as to obtain multiple power disturbance quantities corresponding to the new energy power system in real time; wherein, the detection time corresponds one-to-one with the power disturbance quantity, and the time interval between each detection time is equal;

[0035] The first calculation unit is used to calculate multiple frequency change rates corresponding to the new energy power system according to a preset frequency change rate algorithm, based on the moment of inertia and each of the power disturbances.

[0036] As a preferred embodiment, the data acquisition module specifically includes:

[0037] The data acquisition unit is used to acquire the inertial constant of each generator set in the new energy power system and the operating capacity of each generator set.

[0038] The second calculation unit is used to calculate the moment of inertia according to a preset moment of inertia algorithm, based on the inertia constant of each generator set and the operating capacity of each generator set.

[0039] As a preferred embodiment, the single disturbance power impact includes DC bipolar blocking, tripping of parallel double-circuit AC transmission lines, and tripping of the two generator sets with the largest capacity in a single plant. Attached Figure Description

[0040] Figure 1 : A flowchart illustrating a method for assessing the frequency stability level of a new energy power system according to Embodiment 1 of the present invention;

[0041] Figure 2 : This is a schematic diagram showing the sorting results of all frequency change rates corresponding to the new energy power system provided in Embodiment 1 of the present invention, arranged from largest to smallest;

[0042] Figure 3 This is a schematic diagram of the structure of a frequency stability level assessment system for a new energy power system provided in Embodiment 1 of the present invention. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] Example 1:

[0045] Please refer to Figure 1 This invention provides a method for assessing the frequency stability level of a new energy power system. The method includes steps S1 to S3, each of which is detailed below:

[0046] Step S1: Obtain the moment of inertia K of all generator sets in the new energy power system. sys .

[0047] As a preferred embodiment, step S1 includes steps S11 to S12, each of which is detailed below:

[0048] Step S11, please refer to equation (1) to obtain the inertial constant H of each generator unit in the new energy power system. i And obtain the operating capacity S of each generator set. Ni .

[0049]

[0050] Among them, T i Let T be the inertial time constant. i Used to characterize the time required for the i-th no-load generator set to accelerate from rest to rated speed under rated torque, and with inertial constant H i The inertial time constant T is used to characterize the time during which a generator set can provide energy to a load equal to its rated capacity using only its stored kinetic energy. i and inertial constant H i The unit for all values ​​is s.

[0051] Step S12, please refer to equation (2), based on the inertia constant H of each generator set. i and the operating capacity S of each generator set. Ni The moment of inertia K was calculated. sys .

[0052]

[0053] Among them, S Ni Used to characterize the operating capacity of the i-th generator.

[0054] Step S2: Within a preset time scale, apply a single disturbance power impact to the new energy power system multiple times to obtain multiple power disturbance quantities ΔP corresponding to the new energy power system in real time, and combine them with the rotational inertia K. sys By analyzing the various power disturbances ΔP, we can obtain multiple frequency change rates R corresponding to the new energy power system. oCoF Among them, the power disturbance ΔP and the frequency change rate R oCoF One-to-one correspondence.

[0055] As a preferred option, the single disturbance power impact in step S2 includes, but is not limited to, the following: DC bipolar blocking, tripping of parallel double-circuit AC transmission lines, and tripping of the two generator sets with the largest capacity in a single plant.

[0056] As a preferred embodiment, step S2 includes steps S21 to S22, each of which is detailed below:

[0057] Step S21: At multiple detection times within a preset time scale range, a single disturbance power impact is applied to the new energy power system to obtain multiple power disturbance quantities ΔP corresponding to the new energy power system in real time; wherein, the detection time corresponds one-to-one with the power disturbance quantity ΔP, and the time interval between each detection time is equal.

[0058] It should be noted that the rate of frequency change is one of the important indicators for measuring the frequency response of a system. It characterizes the rate at which the system frequency changes and reflects the system's sensitivity to disturbances. At the initial moment of the disturbance, since the rotor speed and power angle of the synchronous machine remain unchanged, the rate of frequency change R... oCoF The unbalanced power of the system can be characterized by the power disturbance ΔP, and the rotational inertia K can be characterized by the rotational kinetic energy. sys And it was calculated.

[0059] Step S22, please refer to equation (3), based on the moment of inertia K sys Given the power disturbance ΔP at different times, the frequency change rate R of the new energy power system at different times is calculated. oCoF .

[0060]

[0061] Step S3: According to the preset filtering rules, based on the rate of change of all frequencies R oCoF The system confidence frequency change rate of the new energy power system is determined in order to complete the assessment of the frequency stability level of the new energy power system.

[0062] As a preferred embodiment, step S3 includes steps S31 to S32, each of which is detailed below:

[0063] Step S31, change all frequency rates R oCoF Arrange them in descending order.

[0064] Step S32: According to the arrangement result, with a frequency change rate R at the preset position. oCoF As the system confidence frequency change rate of the new energy power system, and using the quantile value corresponding to the preset position, it is used to characterize the possibility that the frequency change rate of each frequency of the new energy power system is greater than the system confidence frequency change rate, so as to complete the assessment of the frequency stability level of the new energy power system.

[0065] As an example, in 2020, the four provinces and regions under the Southern Power Grid (Guangdong, Guangxi, Guizhou, and Hainan) had a variety of power sources, including coal-fired power, gas-fired power, hydropower, nuclear power, wind power, and photovoltaic power. Statistical calculations show that the inertia constant of coal-fired power is 3.5s, gas-fired power is 5.5s, hydropower is 4.5s, nuclear power is 5.3s, wind power is 0, and photovoltaic power is 0. The operating capacity of different types of power sources is detailed in Table 1.

[0066] Table 1. Operating capacity of different power sources in four provinces of China Southern Power Grid at a certain time (100 million kW)

[0067] Power type Boot capacity coal-fired power 0.81 Gas electricity 0.21 Hydropower 0.40 nuclear power 0.20 wind power 0.03 Photovoltaics 0.05

[0068] Based on the above data and combined with equation (2), the moment of inertia K of all generator sets in the system can be obtained. sys =3.5×0.81+5.5×0.21+4.5×0.4+5.3×0.2=685 million kWs.

[0069] Next, every hour throughout the year, the power disturbance of the renewable energy power system in the four provinces and regions of the Southern Power Grid during the bipolar blocking of the Kunming-Liuzhou-Longyan DC transmission line was acquired in real time. This allowed for the calculation of the frequency change rate of the renewable energy power system at different times, resulting in a total of 8760 R... oCoF The value is used as a statistical sample dataset. Specifically, at a certain detection time, when the Kunliulong DC bipolar blocking occurs in the four provinces of the Southern Power Grid, a total power loss of 8000MW is generated, i.e., ΔP=8000MW. At this time, combined with equation (3), the frequency change rate corresponding to the new energy power system at the current detection time is calculated.

[0070] Finally, please refer to Figure 2 The rate of change R of all frequencies in the statistical sample dataset oCoF Arranged in descending order, the horizontal axis represents the ranking position of the frequency change rate, and the vertical axis represents the frequency change rate R. oCoF And the frequency change rate R corresponding to the 95th percentile value in the arrangement results. oCoF =0.132Hz / s, which is taken as the system confidence frequency change rate of the new energy power system. At this time, the frequency stability level assessment result of the new energy power system in the four provinces of the Southern Power Grid is that the probability that the frequency change rate of the new energy power system in the four provinces of the Southern Power Grid is greater than the system confidence frequency change rate is 95%, which is used to measure the ability of the new energy power system in the four provinces of the Southern Power Grid to resist unbalanced power disturbances over a long time scale.

[0071] Please refer to Figure 3This is a schematic diagram of a frequency stability level assessment system for a new energy power system provided in an embodiment of the present invention. The system includes a data acquisition module M1, a disturbance application module M2, and an assessment module M3, the specific details of which are as follows:

[0072] The data acquisition module M1 is used to acquire the rotational inertia of all generator sets in the new energy power system.

[0073] The disturbance application module M2 is used to apply a single disturbance power impact to the new energy power system multiple times within a preset time scale to obtain multiple power disturbance quantities corresponding to the new energy power system in real time. Combined with the moment of inertia and each power disturbance quantity, multiple frequency change rates corresponding to the new energy power system are analyzed and obtained. Among them, the power disturbance quantity and the frequency change rate correspond one-to-one.

[0074] The evaluation module M3 is used to determine the system confidence frequency change rate of the new energy power system according to the preset screening rules and all frequency change rates. It also uses the quantile value corresponding to the preset position to characterize the probability that each frequency change rate of the new energy power system is greater than the system confidence frequency change rate, so as to complete the evaluation of the frequency stability level of the new energy power system.

[0075] As a preferred embodiment, the evaluation module M3 specifically includes an arrangement unit 31 and an evaluation unit 32, with each unit as follows:

[0076] Arrangement unit 31 is used to arrange all frequency change rates in descending order;

[0077] The evaluation unit 32 is used to evaluate the frequency stability level of the new energy power system by taking the frequency change rate at the preset position as the system confidence frequency change rate of the new energy power system according to the arrangement results.

[0078] As a preferred embodiment, the disturbance application module M2 specifically includes a disturbance application unit 21 and a first calculation unit 22, the details of which are as follows:

[0079] The disturbance application unit 21 is used to apply a single disturbance power impact to the new energy power system at multiple detection times within a preset time scale range, so as to obtain multiple power disturbance quantities corresponding to the new energy power system in real time; wherein, the detection time corresponds one-to-one with the power disturbance quantity, and the time interval between each detection time is equal;

[0080] The first calculation unit 22 is used to calculate multiple frequency change rates corresponding to the new energy power system according to a preset frequency change rate algorithm, based on the moment of inertia and various power disturbances.

[0081] As a preferred embodiment, the data acquisition module M1 specifically includes a data acquisition unit 11 and a second calculation unit 12, with each unit as follows:

[0082] The data acquisition unit 11 is used to acquire the inertial constant of each generator set in the new energy power system and the operating capacity of each generator set.

[0083] The second calculation unit 12 is used to calculate the moment of inertia according to a preset moment of inertia algorithm, based on the inertia constant of each generator set and the operating capacity of each generator set.

[0084] As a preferred option, the single disturbance power impact mentioned in the disturbance application module M2 includes DC bipolar blocking, tripping of parallel double-circuit AC transmission lines, and tripping of the two generator sets with the largest capacity in a single plant.

[0085] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working process of the system described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0086] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0087] This invention provides a method and system for assessing the frequency stability level of a new energy power system. Within a preset time scale, a single disturbance power impact is applied to the new energy power system multiple times to obtain the power disturbance amount of the new energy power system at different times. Based on the rotational inertia of all generator sets in the system and all power disturbance amounts, the system confidence frequency change rate of the new energy power system is analyzed and obtained. This allows for the analysis and assessment of the frequency stability level of the new energy power system even when the power generation level of the new energy power system changes with weather conditions. This measures the system's ability to resist unbalanced power disturbances over a long time scale and improves the accuracy of the assessment of the frequency stability level of the new energy power system.

[0088] Furthermore, the frequency change rates are arranged in descending order, and the frequency change rate at a preset position in the frequency change rate arrangement is taken as the system confidence frequency change rate of the new energy power system. The frequency stability level assessment result of the new energy power system is determined by the quantile value corresponding to the preset position in the frequency change rate arrangement, which indicates that the probability that the frequency change rate of the new energy power system is greater than the system confidence frequency change rate. This allows grid operation and management personnel to analyze the stability of their grid system.

[0089] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention for those skilled in the art.

Claims

1. A method for assessing the frequency stability level of a new energy power system, characterized in that, include: Obtain the rotational inertia of all generator sets in the new energy power system; Within a preset time scale, a single disturbance power impact is applied to the new energy power system multiple times to obtain multiple power disturbance quantities corresponding to the new energy power system in real time. Combined with the moment of inertia and each power disturbance quantity, multiple frequency change rates corresponding to the new energy power system are analyzed and obtained. Specifically, at multiple detection moments within a preset time scale, a single disturbance power impact is applied to the new energy power system to obtain multiple power disturbance quantities corresponding to the new energy power system in real time. According to a preset frequency change rate algorithm, multiple frequency change rates corresponding to the new energy power system are calculated based on the moment of inertia and each power disturbance quantity. Wherein, each detection moment corresponds one-to-one with each power disturbance quantity, and the time interval between each detection moment is equal. According to preset screening rules, the system confidence frequency change rate of the new energy power system is determined based on all the frequency change rates to complete the frequency stability level assessment of the new energy power system. Specifically, all the frequency change rates are arranged in descending order; according to the arrangement result, the frequency change rate at the preset position is taken as the system confidence frequency change rate of the new energy power system, and the quantile value corresponding to the preset position is used to characterize the probability that each of the frequency change rates of the new energy power system is greater than the system confidence frequency change rate, so as to complete the frequency stability level assessment of the new energy power system. The power disturbance quantity corresponds one-to-one with the frequency change rate.

2. The method for evaluating the frequency stability level of a new energy power system as described in claim 1, characterized in that, The acquisition of the rotational inertia of all generator sets in the new energy power system specifically involves: Obtain the inertial constant and the operating capacity of each generator set in the new energy power system; The moment of inertia is calculated according to the preset rotational inertia algorithm, based on the inertia constant of each generator set and the operating capacity of each generator set.

3. The method for evaluating the frequency stability level of a new energy power system as described in claim 1, characterized in that, The single disturbance power impact includes DC bipolar blocking, tripping of parallel double-circuit AC transmission lines, and tripping of the two generator sets with the largest capacity in a single plant.

4. A frequency stability level assessment system for a new energy power system, characterized in that, include: The data acquisition module is used to acquire the rotational inertia of all generator sets in the new energy power system. A disturbance application module is used to apply a single disturbance power impact to the new energy power system multiple times within a preset time scale range to obtain multiple power disturbance quantities corresponding to the new energy power system in real time, and to analyze and obtain multiple frequency change rates corresponding to the new energy power system by combining the moment of inertia and each of the power disturbance quantities; wherein, the power disturbance quantity corresponds one-to-one with the frequency change rate; the disturbance application module specifically includes: a disturbance application unit, used to apply a single disturbance power impact to the new energy power system at multiple detection times within a preset time scale range to obtain multiple power disturbance quantities corresponding to the new energy power system in real time; wherein, the detection time corresponds one-to-one with the power disturbance quantity, and the time interval between each detection time is equal; a first calculation unit, used to calculate multiple frequency change rates corresponding to the new energy power system according to a preset frequency change rate algorithm, based on the moment of inertia and each of the power disturbance quantities; An evaluation module is used to determine the system confidence frequency change rate of the new energy power system according to preset screening rules and based on all the frequency change rates, so as to complete the evaluation of the frequency stability level of the new energy power system. The evaluation module specifically includes: a sorting unit, used to sort all the frequency change rates in descending order; and an evaluation unit, used to select the frequency change rate at a preset position as the system confidence frequency change rate of the new energy power system according to the sorting result, and to use the quantile value corresponding to the preset position to characterize the probability that each frequency change rate of the new energy power system is greater than the system confidence frequency change rate, so as to complete the evaluation of the frequency stability level of the new energy power system.

5. The frequency stability level assessment system for a new energy power system as described in claim 4, characterized in that, The data acquisition module specifically includes: The data acquisition unit is used to acquire the inertial constant of each generator set in the new energy power system and the operating capacity of each generator set. The second calculation unit is used to calculate the moment of inertia according to a preset moment of inertia algorithm, based on the inertia constant of each generator set and the operating capacity of each generator set.

6. The frequency stability level assessment system for a new energy power system as described in claim 4, characterized in that, The single disturbance power impact includes DC bipolar blocking, tripping of parallel double-circuit AC transmission lines, and tripping of the two generator sets with the largest capacity in a single plant.

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