Method and device for analyzing frequency security domain of power grid

Abstract

The invention provides a power grid frequency safety domain analysis method and device. The method comprises the following steps: determining an index influencing the frequency modulation capability of a power grid according to the total load of the system, the generated output of a power supply for providing primary frequency modulation service, the rated output of the power supply and the maximum power lost by the system when the system has a single fault; aggregating the total load of the system, the power supply generated output providing the primary frequency modulation service, the power supply rated output providing the primary frequency modulation service and the maximum power lost by the system when the system has a single fault to obtain a system frequency response model parameter; inputting the system frequency response model parameters into the system frequency response model, obtaining a power loss ratio and a non-primary frequency modulation power supply output ratio under the current primary frequency modulation power supply load rate according to the indexes influencing the power grid frequency modulation capability, and further determining the system frequency safety domain. According to the invention, the frequency security domain and the frequency destruction domain can be visually and effectively divided.

Description

Technical Field

[0001] The present application relates to the field of power system maintenance, and specifically to a method and device for analyzing a power grid frequency security domain. Background Art

[0002] At present, frequency security mainly relies on the determination of the dynamic response of frequency. However, frequency security should require quantitative evaluation indicators and methods so that power system operators can understand its characteristics and implement control accordingly. Based on the grid frequency response model, the relevant indicators that affect the grid frequency regulation capability are analyzed, and corresponding frequency regulation measures are formulated to better deal with frequency security risks.

[0003] The evaluation of frequency regulation capability in the existing technology mainly focuses on the post-analysis of the data monitored after the disturbance accident and the study of the frequency response curve based on the system. Traditional evaluation indicators mainly include frequency drop rate, maximum frequency deviation, frequency steady-state deviation, minimum frequency time and frequency steady-state time. There have been some research works and achievements in this regard, but there are still problems. First, from the perspective of safe operation of the power system, it is necessary to quantitatively evaluate the safety indicators of the system frequency; second, from the perspective of the overall characteristics of the power system, it is necessary to analyze the changing laws of the safety of the system frequency under the new background of the modern power system.

[0004] This section is intended to provide a background or context to the embodiments of the invention recited in the claims. No admission is made that the description herein is prior art by inclusion in this section. Summary of the invention

[0005] In response to the problems in the prior art, the present application provides a method and device for analyzing the frequency safety domain of a power grid, which can intuitively and effectively divide the frequency safety domain and the frequency destruction domain, and quickly determine whether there is a frequency safety risk in the power grid according to the operation mode of the power grid and the possible power disturbance value.

[0006] In order to solve the above technical problems, this application provides the following technical solutions:

[0007] In a first aspect, the present application provides a method for analyzing a power grid frequency security domain, comprising:

[0008] Determine the indicators that affect the frequency regulation capability of the power grid based on the total system load, the power generation output of the power source providing primary frequency regulation service, the rated output of the power source providing primary frequency regulation service, and the maximum power loss of the system when a single fault occurs in the system;

[0009] Aggregating the total load of the system, the power generation output of the power source providing primary frequency regulation service, the rated output of the power source providing primary frequency regulation service, and the maximum power loss of the system when a single fault occurs in the system to obtain system frequency response model parameters;

[0010] Inputting the system frequency response model parameters into a pre-constructed system frequency response model, and obtaining the power loss ratio value and the non-primary frequency regulation power output ratio value under the current primary frequency regulation power supply load rate according to the index affecting the power grid frequency regulation capability;

[0011] The system frequency safety domain is determined according to the power loss proportion value under the current primary frequency modulation power supply load rate and the non-primary frequency modulation power supply output proportion value.

[0012] Furthermore, the indicators affecting the frequency regulation capability of the power grid include the output ratio of primary frequency regulation power sources, the output ratio of non-primary frequency regulation power sources, the load rate of primary frequency regulation power sources, and the power loss ratio; the indicators affecting the frequency regulation capability of the power grid are determined based on the total system load, the power generation output of the power sources providing primary frequency regulation services, the rated output of the power sources providing primary frequency regulation services, and the maximum power loss of the system when a single fault occurs in the system, including:

[0013] The ratio of the power generation output of the power supply providing the primary frequency regulation service to the total load of the system is determined as the primary frequency regulation power supply output ratio;

[0014] The ratio of the power generation output of the power source that does not provide primary frequency regulation service to the total load of the system is determined as the non-primary frequency regulation power source output ratio;

[0015] Determine the ratio of the power generation output of the power supply providing the primary frequency regulation service to the rated output of the power supply providing the primary frequency regulation service as the primary frequency regulation power supply load rate;

[0016] The ratio of the maximum power lost by the system when a single fault occurs in the system to the total load of the system is determined as the power loss ratio.

[0017] Furthermore, the system frequency response model parameters include system inertia time constant, system equivalent damping, some parameters of the generator prime mover speed regulator equivalent model, and parameters of the aggregated limiter and dead zone link; the system total load, power generation output of the power supply providing primary frequency regulation service, rated output of the power supply providing primary frequency regulation service, and maximum power loss of the system when a single fault occurs in the system are aggregated to obtain the system frequency response model parameters, including:

[0018] Calculating the system inertia time constant according to the generator set inertia time constant, the generator set kinetic energy, the total load of the system and the rated output of the power supply;

[0019] Calculating the equivalent damping of the system according to the ratio of the rated power of the generator set to the total load of the system, the ratio of the load power to the total load power of the system, the equivalent damping of the generator set and the load equivalent frequency adjustment coefficient;

[0020] Calculating some parameters of the equivalent model of the generator prime mover speed governor according to the ratio of the rated power of the generator set to the total load of the system and the primary frequency regulation coefficient of the generator set;

[0021] The parameters of the aggregated amplitude limiting and dead zone link are calculated according to the parameters of the amplitude limiting and dead zone link of each generator in the generator set and the load power.

[0022] Furthermore, the system frequency response model parameters are input into a pre-built system frequency response model, and the power loss ratio value and the non-primary frequency regulation power output ratio value under the current primary frequency regulation power supply load rate are obtained according to the index affecting the power grid frequency regulation capability, including:

[0023] Respectively set the value ranges of the primary frequency modulation power supply output ratio, the non-primary frequency modulation power supply output ratio, the primary frequency modulation power supply load rate and the power loss ratio;

[0024] The system frequency response model is called for simulation according to the value range. When the maximum system frequency value obtained by simulation exceeds the defense value, the power loss proportion value under the current primary frequency modulation power supply load rate and the current non-primary frequency modulation power supply output proportion value are recorded.

[0025] Further, determining the system frequency safety domain according to the power loss proportion value and the non-primary frequency regulation power supply output proportion value under the current primary frequency regulation power supply load rate includes:

[0026] With the power loss proportion under the current primary frequency modulation power supply load rate as the X-axis and the non-primary frequency modulation power supply output proportion as the Y-axis, the frequency safety critical coordinate points are fitted to draw the system frequency safety domain.

[0027] In a second aspect, the present application provides a device for analyzing a power grid frequency security domain, comprising:

[0028] An index determination unit, used to determine an index affecting the frequency regulation capability of the power grid according to the total load of the system, the power generation output of the power source providing the primary frequency regulation service, the rated output of the power source providing the primary frequency regulation service, and the maximum power loss of the system when a single fault occurs in the system;

[0029] a parameter aggregation unit, for aggregating the total load of the system, the power generation output of the power source providing the primary frequency regulation service, the rated output of the power source providing the primary frequency regulation service, and the maximum power loss of the system when a single fault occurs in the system, to obtain system frequency response model parameters;

[0030] A proportion calculation unit, used for inputting the system frequency response model parameters into a pre-built system frequency response model, and obtaining a power loss proportion value and a non-primary frequency regulation power output proportion value under the current primary frequency regulation power supply load rate according to the index affecting the power grid frequency regulation capability;

[0031] The safety area determination unit is used to determine the system frequency safety domain according to the power loss proportion value and the non-primary frequency modulation power supply output proportion value under the current primary frequency modulation power supply load rate.

[0032] Furthermore, the indicators affecting the frequency regulation capability of the power grid include the output ratio of primary frequency regulation power sources, the output ratio of non-primary frequency regulation power sources, the load rate of primary frequency regulation power sources and the power loss ratio; the indicator determination unit includes:

[0033] A first output ratio determination module, configured to determine the ratio of the power generation output of the power supply providing the primary frequency regulation service to the total load of the system as the output ratio of the primary frequency regulation power supply;

[0034] A second output ratio determination module is used to determine the ratio of the power generation output of the power source that does not provide primary frequency regulation service to the total load of the system as the output ratio of the non-primary frequency regulation power source;

[0035] A power supply load determination module, configured to determine the ratio of the power generation output of the power supply providing the primary frequency regulation service to the rated output of the power supply providing the primary frequency regulation service as the primary frequency regulation power supply load rate;

[0036] The loss ratio determination module is used to determine the power loss ratio by taking the ratio of the maximum power lost by the system to the total load of the system when a single fault occurs in the system.

[0037] Furthermore, the system frequency response model parameters include system inertia time constant, system equivalent damping, some parameters of the generator prime mover speed regulator equivalent model, and parameters of the aggregated limiter and dead zone links; the parameter aggregation unit includes:

[0038] A time constant determination module, used for calculating the system inertia time constant according to the generator set inertia time constant, the generator set kinetic energy, the system total load and the rated output of the power supply;

[0039] An equivalent damping determination module, used for calculating the equivalent damping of the system according to the ratio of the rated power of the generator set to the total load of the system, the ratio of the load power to the total load power of the system, the equivalent damping of the generator set and the load equivalent frequency adjustment coefficient;

[0040] A partial parameter determination module, used for calculating partial parameters of the equivalent model of the generator prime mover speed governor according to the ratio of the rated power of the generator set to the total load of the system and the primary frequency regulation coefficient of the generator set;

[0041] The limiting dead zone determination module is used to calculate the parameters of the aggregate limiting and dead zone link according to the parameters of the limiting and dead zone links of each generator in the generator set and the load power.

[0042] Furthermore, the proportion calculation unit includes:

[0043] A value range determination module, used to respectively set the value ranges of the primary frequency modulation power supply output ratio, the non-primary frequency modulation power supply output ratio, the primary frequency modulation power supply load rate and the power loss ratio;

[0044] The proportion recording module is used to call the system frequency response model for simulation according to the value range. When the maximum system frequency value obtained by simulation exceeds the defense value, the power loss proportion value under the current primary frequency modulation power supply load rate and the current non-primary frequency modulation power supply output proportion value are recorded.

[0045] Furthermore, the safety area determination unit is specifically used to fit the frequency safety critical coordinate points with the power loss proportion under the current primary frequency modulation power supply load rate as the X-axis and the non-primary frequency modulation power supply output proportion as the Y-axis to draw the system frequency safety domain.

[0046] In a third aspect, the present application provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method for analyzing the power grid frequency security domain when executing the program.

[0047] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method for analyzing the power grid frequency security domain.

[0048] In a fifth aspect, the present application provides a computer program product, comprising a computer program / instruction, which, when executed by a processor, implements the steps of the method for analyzing the power grid frequency security domain.

[0049] In response to the problems in the prior art, the analysis method and device of the power grid frequency safety domain provided in the present application can determine the power loss proportion under the current primary frequency regulation power supply load rate and the power output proportion of the non-primary frequency regulation power supply according to the total system load, the power generation output of the power supply providing primary frequency regulation service, the rated output of the power supply providing primary frequency regulation service and the maximum power lost by the system when a single fault occurs in the system, thereby intuitively and effectively dividing the frequency safety domain and the frequency destruction domain, and quickly judging whether there is a frequency safety risk in the power grid according to the operation mode of the power grid and the possible power disturbance value. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0051] Figure 1 It is a flow chart for realizing the method of the present invention;

[0052] Figure 2 It is the structure of the grid frequency response model;

[0053] Figure 3 It is the safety zone that only considers the primary frequency regulation of conventional units;

[0054] Figure 4 It is the safety zone for new energy to participate in primary frequency regulation;

[0055] Figure 5 It is the frequency response of new energy participating in primary frequency modulation;

[0056] Figure 6 It is a safety domain that takes into account frequency safety control and primary frequency regulation of renewable energy;

[0057] Figure 7 It is the frequency response taking into account frequency safety control and primary frequency modulation of renewable energy;

[0058] Figure 8 This is a flow chart of a method for analyzing a power grid frequency security domain in an embodiment of the present application;

[0059] Fig. 9 A flow chart for determining an indicator that affects the frequency regulation capability of a power grid in an embodiment of the present application;

[0060] Fig.10 A flow chart for obtaining system frequency response model parameters in an embodiment of the present application;

[0061] Fig.11 This is a flow chart of obtaining the percentage value in the embodiment of the present application;

[0062] Fig.12 This is a structural diagram of a device for analyzing a power grid frequency safety domain in an embodiment of the present application;

[0063] Fig.13 This is a structural diagram of an indicator determination unit in an embodiment of the present application;

[0064] Fig.14 This is a structural diagram of a parameter aggregation unit in an embodiment of the present application;

[0065] Fig.15This is a structural diagram of a proportion calculation unit in an embodiment of the present application;

[0066] Fig.16 It is a schematic diagram of the structure of an electronic device in an embodiment of the present application. DETAILED DESCRIPTION

[0067] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0068] The information collected in the technical solution of this application is information and data authorized by the user or fully authorized by all parties, and the collection, storage, use, processing, transmission, provision, disclosure and application of relevant data comply with the relevant laws, regulations and standards of relevant countries and regions, take necessary confidentiality measures, do not violate public order and good morals, and provide corresponding operation entrances for users to choose to authorize or refuse.

[0069] Provide users with corresponding operation entrances for them to choose to agree or reject the automated decision-making results; if the user chooses to reject, the expert decision-making process will be entered.

[0070] In one embodiment, see Figure 8 In order to intuitively and effectively divide the frequency safety domain and the frequency destruction domain, and quickly determine whether the power grid has a frequency safety risk according to the operation mode of the power grid and the possible power disturbance value, the present application provides a method for analyzing the frequency safety domain of the power grid, including:

[0071] S101: Determine an index affecting the frequency regulation capability of the power grid based on the total system load, the power generation output of the power source providing the primary frequency regulation service, the rated output of the power source providing the primary frequency regulation service, and the maximum power loss of the system when a single fault occurs in the system;

[0072] S102: Aggregating the total load of the system, the power generation output of the power source providing the primary frequency regulation service, the rated output of the power source providing the primary frequency regulation service, and the maximum power loss of the system when a single fault occurs in the system to obtain system frequency response model parameters;

[0073] S103: Inputting the system frequency response model parameters into a pre-built system frequency response model, and obtaining a power loss ratio value and a non-primary frequency regulation power output ratio value under the current primary frequency regulation power supply load rate according to the index affecting the power grid frequency regulation capability;

[0074] S104: Determine a system frequency safety domain according to a power loss percentage value and a non-primary frequency regulation power supply output percentage value under the current primary frequency regulation power supply load rate.

[0075] It can be understood that the present invention provides a method that can intuitively and effectively divide the frequency safety domain and the frequency destruction domain, and can quickly determine whether the power grid has frequency safety risks according to the operation mode of the power grid and the possible power disturbance value. Figure 1 , the method provided in this application has the following steps:

[0076] Step A: Define the relevant indicators that affect the power grid frequency regulation capability, including: primary frequency regulation power output ratio K, non-primary frequency regulation power output ratio K1, primary frequency regulation power load rate λ and power loss ratio K PL ;

[0077] Step B: Taking into account relevant indicators, establish a simplified aggregation model of grid frequency response;

[0078] Step C: Set the possible index range and cyclically call the power grid frequency response model to perform scanning simulation;

[0079] Step D: Establish the power loss ratio K PL The frequency safety domain coordinate system with K1 as the horizontal axis and the non-primary frequency modulation power output ratio as the vertical axis records the coordinate point when the maximum frequency reaches the defense value (such as low frequency 49.1Hz);

[0080] Step E: Use curve fitting to fit the frequency safety critical coordinate points and draw the system frequency safety domain.

[0081] Among them, the grid frequency response model, its internal logical structure can be seen in Figure 2 shown.

[0082]

[0083] ΔP m =ΔP m1 +ΔP m2 (10)

[0084]

[0085] Among them, K PL is the ratio of the maximum power loss of the system to the system load at that moment, K1 is the ratio of the total output of the power source that does not provide primary frequency regulation service to the total system load, λ is the ratio of the total output of the power source that provides primary frequency regulation service to its rated power, ΔP m is the change in mechanical power of the prime mover (including the turbine ΔP m1 and turbine ΔP m2 ), Δf is the system frequency change, T J is the generator inertia time constant, K D is the damping coefficient, and s is the Laplace operator.

[0086] Figure 2 The meanings of other symbols in are as follows: T as 、T bs 、T cs is the time constant of the steam turbine prime mover and speed governor, T ah 、T bh 、T ch is the time constant of the turbine prime mover and speed governor, K GS is the turbine regulation coefficient, K GH is the regulation coefficient of the turbine, P T is the main steam pressure of the boiler, T sh is the boiler superheater volume time constant, T d is the drum time constant (the model takes into account the main steam pressure change process of the boiler), It is the ratio of the power generation output of the power supply providing primary frequency regulation service to the rated output of the power supply providing primary frequency regulation service. The ratio of the power generation output of the power source providing primary frequency regulation service to the total system load. The ratio of the rated output of the power source providing primary frequency regulation service to the total system load.

[0087] From the above description, it can be seen that the analysis method of the power grid frequency safety domain provided in the present application can determine the power loss proportion under the current primary frequency regulation power supply load rate and the power output proportion of the non-primary frequency regulation power supply according to the total system load, the power generation output of the power supply providing primary frequency regulation service, the rated output of the power supply providing primary frequency regulation service and the maximum power loss of the system when a single fault occurs in the system, thereby intuitively and effectively dividing the frequency safety domain and the frequency destruction domain, and quickly judging whether there is a frequency safety risk in the power grid according to the operation mode of the power grid and the possible power disturbance value.

[0088] In one embodiment, see Fig. 9 The indicators that affect the frequency regulation capability of the power grid include the output ratio of primary frequency regulation power sources, the output ratio of non-primary frequency regulation power sources, the load rate of primary frequency regulation power sources, and the power loss ratio; the indicators that affect the frequency regulation capability of the power grid are determined based on the total system load, the power generation output of the power sources providing primary frequency regulation services, the rated output of the power sources providing primary frequency regulation services, and the maximum power loss of the system when a single fault occurs in the system, including:

[0089] S201: Determine the ratio of the power generation output of the power supply providing the primary frequency regulation service to the total load of the system as the primary frequency regulation power supply output ratio;

[0090] S202: Determine the ratio of the power generation output of the power source that does not provide primary frequency regulation service to the total load of the system as the non-primary frequency regulation power source output ratio;

[0091] S203: Determine the ratio of the power generation output of the power supply providing the primary frequency regulation service to the rated output of the power supply providing the primary frequency regulation service as the primary frequency regulation power supply load rate;

[0092] S204: Determine the power loss ratio by the ratio of the maximum power lost by the system when a single fault occurs in the system to the total load of the system.

[0093] It is understandable that in Figure 1 In step A, the relevant indicators that affect the frequency regulation capability of the power grid are defined, including:

[0094] Step A1: Define the primary frequency regulation power output ratio as the ratio K between the total power generation output of the power source providing primary frequency regulation service and the total system load.

[0095] K = P G0 / P L0 (1)

[0096] Where P G0 Total power output for providing primary frequency regulation service, GW; P L0 is the total system load, GW.

[0097] Step A2: Define the non-primary frequency regulation power output ratio as the ratio between the total power output that does not provide primary frequency regulation service and the total system load as K1. Obviously, K1 = 1-K;

[0098] Step A3: Define the primary frequency regulation power source load rate as the ratio of the total power generation output of the power source providing primary frequency regulation service to its rated power λ.

[0099] λ=P G0 / P GN (2)

[0100] Where P G0 The total power output for providing primary frequency regulation service, P GN The rated output of the power source providing primary frequency regulation service is GW. Obviously, λ∈(0,1).

[0101] Step A4: Define the power loss ratio as the ratio of the maximum power ΔP lost by the system when a single fault occurs (including DC bipolar blocking fault) to the system load at that moment, which is K PL .

[0102] K PL =ΔP / P L0 (3)

[0103] Where ΔP is the maximum power loss of the system when a single fault occurs in the system (including DC bipolar blocking fault), P L0 is the total system load, GW.

[0104] From the above description, it can be seen that the analysis method of the power grid frequency safety domain provided in this application can determine the indicators affecting the power grid frequency regulation capability based on the total system load, the power generation output of the power supply providing primary frequency regulation service, the rated output of the power supply providing primary frequency regulation service, and the maximum power lost by the system when a single fault occurs in the system.

[0105] In one embodiment, see Fig.10 The system frequency response model parameters include system inertia time constant, system equivalent damping, some parameters of the equivalent model of the generator prime mover speed regulator, and parameters of the aggregated limit and dead zone links; the system total load, the power generation output of the power supply providing primary frequency regulation service, the rated output of the power supply providing primary frequency regulation service, and the maximum power loss of the system when a single fault occurs in the system are aggregated to obtain the system frequency response model parameters, including:

[0106] S301: Calculating the system inertia time constant according to the generator set inertia time constant, the generator set kinetic energy, the system total load and the rated output of the power source;

[0107] S302: calculating the system equivalent damping according to the ratio of the rated power of the generator set to the total load of the system, the ratio of the load power to the total load power of the system, the equivalent damping of the generator set and the load equivalent frequency adjustment coefficient;

[0108] S303: Calculating some parameters of the equivalent model of the generator prime mover speed governor according to the ratio of the rated power of the generator set to the total load of the system and the primary frequency regulation coefficient of the generator set;

[0109] S304: Calculate the parameters of the aggregated limit and dead zone link according to the parameters of the limit and dead zone link of each generator in the generator set and the load power.

[0110] It is understandable that in Figure 1 In step B, taking into account the index parameters, a simplified grid frequency response aggregation model is established, including:

[0111] Step B1: Establish a large power grid frequency response model equivalent to a single machine;

[0112] Step B2: Take into account the four parameters P used to calculate the indicator G0 , P L0 , P GN , ΔP, and obtain the system frequency response model parameters through weighted aggregation.

[0113] ① Aggregation inertia time constant H:

[0114]

[0115] Where n is the number of all generators that are turned on and participate in the primary frequency regulation; m is the number of all loads in the system; ρ Hi It is the ratio of the rated power of the generator set to the total load power of the system; H i 、E ki and P GNi are the inertia time constant, kinetic energy and rated output of the power supply for primary frequency regulation service of the generator set, P Li is the power of the ith load.

[0116] ② Equivalent damping of the polymerization system K D :

[0117]

[0118] Where n is the number of all generators that are turned on and participate in the primary frequency regulation; m is the number of all loads in the system; ρ Gi is the ratio of the rated power of the generator set to the total load power of the system; ρ Li is the ratio of load power to total system load power; P Li is the power of the i-th load; P GNi The rated output of the power supply providing primary frequency regulation service; D i is the equivalent damping of the generator set; K Li is the frequency regulation coefficient of the load; D is the total equivalent damping of the generator set; K L is the total equivalent frequency regulation coefficient of the load;

[0119] ③ Parameter K of the equivalent model of the prime mover-speed governor of the aggregate generator G * 、T a 、T b 、T c :

[0120]

[0121] Where n is the number of all generators that are turned on and participate in the primary frequency regulation; m is the number of all loads in the system; ρ Ki K is the ratio of the rated power of the generator set to the total load power of the system; Gi is the primary frequency regulation coefficient of the generator set; P GNi The rated output of the power supply providing primary frequency regulation service, P Li is the power of the ith load.

[0122]

[0123] Where n is the number of all generator sets that are turned on and participate in primary frequency regulation; η i is the frequency regulation coefficient and weight ρ of the i-th generator set KiThe product of the equivalent frequency modulation coefficient K G * The weight of T ai 、T bi 、T ci are the equivalent time constants corresponding to the equivalent prime mover-speed governor model of the i-th generator set; T a 、T b 、T c is the equivalent time constant after polymerization; K Gi is the primary frequency regulation coefficient of the generator set.

[0124] ④ Parameter L of the aggregation limiter and dead zone link:

[0125]

[0126] Where n is the number of all generators that are turned on and participate in the primary frequency regulation; m is the total load; L i P is the parameter of each generator limit and dead link; Li is the power of the ith load; L is the parameter of the aggregate limiting and dead zone link, which is generally set to ±0.033Hz.

[0127] From the above description, it can be seen that the analysis method of the power grid frequency safety domain provided in the present application can aggregate the total load of the system, the power generation output of the power supply providing primary frequency regulation service, the rated output of the power supply providing primary frequency regulation service, and the maximum power loss of the system when a single fault occurs in the system to obtain the system frequency response model parameters.

[0128] In one embodiment, see Fig.11 , the system frequency response model parameters are input into a pre-built system frequency response model, and the power loss ratio value and the non-primary frequency regulation power output ratio value under the current primary frequency regulation power supply load rate are obtained according to the index affecting the power grid frequency regulation capability, including:

[0129] S401: respectively setting the value ranges of the primary frequency modulation power supply output ratio, the non-primary frequency modulation power supply output ratio, the primary frequency modulation power supply load rate and the power loss ratio;

[0130] S402: Call the system frequency response model for simulation according to the value range, and when the maximum system frequency value obtained by simulation exceeds the defense value, record the power loss proportion value under the current primary frequency modulation power supply load rate and the current non-primary frequency modulation power supply output proportion value.

[0131] It is understandable that in Figure 1 In step C, a possible index range is set, and the power grid frequency response model is cyclically called to perform scanning simulation, including:

[0132] Step C1: Set the frequency modulation power supply load rate λ to a range of 0.5 to 1, the non-primary frequency modulation power supply output ratio K1 to a range of 0.6 to 1.0, and the power loss ratio K PL The possible value range of K is 0.03 to 0.08; wherein, K1=1-K, therefore, there is no need to set the value range of K separately.

[0133] Step C2: Set the triple loop and index loop step length, and loop through the value ranges of the three indexes. Call the system frequency response model in the loop for simulation. When the maximum frequency value of the simulation result exceeds the defense value, exit the loop and proceed to the next loop.

[0134] It can be understood that other parameters of the model (i.e., except for the control quantity K PL , λ and other parameters other than K1) are the system's own properties that will not change, so we only need to PL By continuously taking values ​​of λ and K1 in a given range, K can be changed under different λ values. PL and K1 value. When the frequency reaches the defense value (such as low frequency 49.1Hz, for computer instruction operation), K PL The graph is drawn with K1 as the horizontal axis and the proportion of non-primary frequency modulation power supply output as the vertical axis.

[0135] exist Figure 1 In step D, establish a power loss ratio K PL The frequency safety domain coordinate system with K1 as the horizontal axis and the non-primary frequency modulation power output ratio K1 as the vertical axis records the coordinate points when the maximum frequency reaches the defense value (such as low frequency 49.1Hz), including:

[0136] Step D1: Use the axis function to convert the power loss ratio K PL as the horizontal axis;

[0137] Step D2: Use the non-primary frequency modulation power output proportion K1 as the vertical coordinate through the axis function;

[0138] Step D3: When the frequency reaches the defense value (such as low frequency 49.1Hz), record the power loss proportion K under the current frequency modulation power load rate λ PL and the value of the non-primary frequency modulation power output ratio K1 to obtain the coordinate point, see Figure 3 shown.

[0139] From the above description, it can be seen that the analysis method of the power grid frequency safety domain provided in the present application can input the system frequency response model parameters into a pre-built system frequency response model, and obtain the power loss proportion value and the non-primary frequency regulation power supply output proportion value under the current primary frequency regulation power supply load rate based on the indicators affecting the power grid frequency regulation capability.

[0140] In one embodiment, determining the system frequency safety domain according to the power loss proportion value and the non-primary frequency modulation power supply output proportion value under the current primary frequency modulation power supply load rate includes:

[0141] With the power loss proportion under the current primary frequency modulation power supply load rate as the X-axis and the non-primary frequency modulation power supply output proportion as the Y-axis, the frequency safety critical coordinate points are fitted to draw the system frequency safety domain.

[0142] It is understandable that in Figure 1 In step E, curve fitting is used to fit the frequency safety critical coordinate points and draw the system frequency safety domain, including:

[0143] Step E1: Pop up the curve fitter interface through the cftool command;

[0144] Step E2: Select data and calculate the power loss proportions K1, K PL And the non-primary frequency modulation power output proportion K1 and as X data and Y data;

[0145] Step E3: Select the fitting type, select polynomial fitting, set the degree to 2, and then you can fit the curve.

[0146] The above process is illustrated by a simulation example below.

[0147] The embodiment of the present application uses a power grid frequency response model, see Figure 2 As shown. Taking 49.1Hz as the minimum frequency defense, the grid frequency response model is scanned and simulated, and it can be obtained that when the minimum frequency is 49.1Hz, the non-primary frequency modulation power generation output ratio K1 and the power loss ratio K PL , and the relationship between the primary frequency modulation power supply load rate λ.

[0148] Without considering the primary frequency regulation of new energy and emergency frequency control, 49.1Hz is set as the lowest frequency. Under different primary frequency regulation power load rates λ, the obtained grid frequency response model is scanned and simulated according to step C. The simulation results are shown in Figure 3 As shown. It can be seen that according to the curves obtained in steps D and E, the left side of the curve is the frequency safety domain, and the right side of the curve is the frequency destruction domain. The left side of the curve can meet the requirement that the minimum frequency is not less than 49.1Hz. As the load rate λ of the primary frequency modulation power source increases, that is, its rotating reserve decreases, the frequency safety domain also decreases. The area on the left side of the curve corresponding to λ being 1 is the absolute safety domain. When the K of the actual system PL When K1 falls in this area, the primary frequency modulation power supply load rate must meet the requirements. PL The smaller it is, the better its frequency safety is.

[0149] Furthermore, with the installed capacity of renewable energy being 75GW and the primary frequency modulation power load factor λ being 0.8, frequency simulation is performed under different renewable energy simultaneous rates. Assuming two situations: 20% of the total renewable energy capacity participates in primary frequency modulation; 70% of the total renewable energy capacity participates in primary frequency modulation. The simulation results are as follows: Figure 4 As shown. The curves obtained according to steps D and E show that after new energy participates in primary frequency regulation, the frequency safety domain increases significantly. When new energy does not participate in frequency regulation, the minimum frequency is more likely to fall below 49.1Hz. Assuming that the power output of non-primary frequency regulation power sources accounts for K1 to 0.5 and the power loss accounts for K PL The frequency response under different renewable energy frequency modulation participation rates is shown in Figure 2. Figure 5 As shown in Figure 2, it can be seen that the participation of new energy in frequency modulation can significantly increase the minimum frequency of the system.

[0150] If the model is simulated with a frequency of 1000MW DC modulation control capability while considering the primary frequency modulation of renewable energy, the model with additional tributary modulation is simulated with a renewable energy installed capacity of 75GW and a primary frequency modulation power load factor of λ of 0.8. The simulation results are as follows: Figure 6 As shown. From the curves obtained according to steps D and E, it can be seen that on the basis of the primary frequency modulation of new energy, the 1000MW DC modulation further increases the frequency safety domain of the system. Assume that the power output of non-primary frequency modulation power source accounts for K1 is 0.5, and the power loss accounts for K PL is 0.05, the primary frequency modulation power supply load factor λ is 0.8, and the frequency simulation is performed. The frequency response simulation results are shown in Figure 7 It can be seen that the participation of new energy in frequency modulation and DC modulation can significantly increase the minimum frequency of the system.

[0151] Based on the same inventive concept, the embodiments of the present application also provide an analysis device for a power grid frequency security domain, which can be used to implement the method described in the above embodiments, as described in the following embodiments. Since the principle of solving the problem by the analysis device for the power grid frequency security domain is similar to the analysis method for the power grid frequency security domain, the implementation of the analysis device for the power grid frequency security domain can refer to the implementation of the method for determining the software performance benchmark, and the repeated parts will not be repeated. As used below, the terms "unit" or "module" can be a combination of software and / or hardware that implements predetermined functions. Although the system described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceived.

[0152] In one embodiment, see Fig.12In order to intuitively and effectively divide the frequency safety domain and the frequency destruction domain, and quickly determine whether the power grid has a frequency safety risk according to the operation mode of the power grid and the possible power disturbance value, the present application provides an analysis device for the power grid frequency safety domain, including:

[0153] The index determination unit 1201 is used to determine the index affecting the frequency regulation capability of the power grid according to the total load of the system, the power generation output of the power source providing the primary frequency regulation service, the rated output of the power source providing the primary frequency regulation service, and the maximum power loss of the system when a single fault occurs in the system;

[0154] The parameter aggregation unit 1202 is used to aggregate the total load of the system, the power generation output of the power source providing the primary frequency regulation service, the rated output of the power source providing the primary frequency regulation service, and the maximum power loss of the system when a single fault occurs in the system to obtain the system frequency response model parameters;

[0155] The proportion calculation unit 1203 is used to input the system frequency response model parameters into the pre-built system frequency response model, and obtain the power loss proportion value and the non-primary frequency regulation power output proportion value under the current primary frequency regulation power supply load rate according to the index affecting the power grid frequency regulation capability;

[0156] The safety area determination unit 1204 is used to determine the system frequency safety domain according to the power loss proportion value and the non-primary frequency regulation power supply output proportion value under the current primary frequency regulation power supply load rate.

[0157] In one embodiment, see Fig.13 The indexes affecting the frequency regulation capability of the power grid include the output ratio of primary frequency regulation power source, the output ratio of non-primary frequency regulation power source, the load rate of primary frequency regulation power source and the power loss ratio; the index determination unit 1201 includes:

[0158] The first output ratio determination module 1301 is used to determine the ratio of the power generation output of the power supply providing the primary frequency regulation service to the total load of the system as the primary frequency regulation power output ratio;

[0159] The second output ratio determination module 1302 is used to determine the ratio of the power generation output of the power source that does not provide primary frequency regulation service to the total load of the system as the output ratio of the non-primary frequency regulation power source;

[0160] The power supply load determination module 1303 is used to determine the ratio of the power generation output of the power supply providing the primary frequency regulation service to the rated output of the power supply providing the primary frequency regulation service as the primary frequency regulation power supply load rate;

[0161] The loss ratio determination module 1304 is used to determine the power loss ratio by taking the ratio of the maximum power lost by the system when a single fault occurs in the system to the total load of the system.

[0162] In one embodiment, see Fig.14 The system frequency response model parameters include system inertia time constant, system equivalent damping, some parameters of the generator prime mover speed regulator equivalent model, and parameters of the aggregated limit and dead zone links; the parameter aggregation unit 1202 includes:

[0163] A time constant determination module 1401 is used to calculate the system inertia time constant according to the generator set inertia time constant, the generator set kinetic energy, the system total load and the rated output of the power supply;

[0164] An equivalent damping determination module 1402 is used to calculate the equivalent damping of the system according to the ratio of the rated power of the generator set to the total load of the system, the ratio of the load power to the total load power of the system, the equivalent damping of the generator set and the load equivalent frequency adjustment coefficient;

[0165] A partial parameter determination module 1403 is used to calculate partial parameters of the equivalent model of the generator prime mover speed governor according to the ratio of the rated power of the generator set to the total load of the system and the primary frequency regulation coefficient of the generator set;

[0166] The limiting dead zone determination module 1404 is used to calculate the parameters of the aggregate limiting and dead zone link according to the parameters of the limiting and dead zone links of each generator in the generator set and the load power.

[0167] In one embodiment, see Fig.15 The proportion calculation unit 1203 includes:

[0168] The value range determination module 1501 is used to set the value range of the frequency modulation power supply load rate, the value range of the non-primary frequency modulation power supply output ratio, and the value range of the power loss ratio respectively;

[0169] The proportion recording module 1502 is used to call the system frequency response model for simulation within a preset cycle step. When the maximum frequency value of the simulation result exceeds the defense value, the power loss proportion value under the current primary frequency modulation power supply load rate and the current non-primary frequency modulation power supply output proportion value are recorded.

[0170] In one embodiment, the safety area determination unit is specifically used to fit the frequency safety critical coordinate points with the power loss proportion under the current primary frequency modulation power supply load rate as the X-axis and the non-primary frequency modulation power supply output proportion as the Y-axis to draw the system frequency safety domain.

[0171] From the hardware level, in order to intuitively and effectively divide the frequency safety domain and the frequency destruction domain, and quickly determine whether the power grid has a frequency safety risk according to the operation mode of the power grid and the possible power disturbance value, the present application provides an embodiment of an electronic device for implementing all or part of the content of the power grid frequency safety domain analysis method, and the electronic device specifically includes the following content:

[0172] Processor, memory, communication interface and bus; wherein the processor, memory and communication interface communicate with each other through the bus; the communication interface is used to realize information transmission between the analysis device of the power grid frequency security domain and related equipment such as the core business system, user terminal and related database; the logic controller can be a desktop computer, a tablet computer and a mobile terminal, etc., but the present embodiment is not limited thereto. In the present embodiment, the logic controller can be implemented with reference to the embodiment of the analysis method of the power grid frequency security domain in the embodiment, and the embodiment of the analysis device of the power grid frequency security domain, and the contents thereof are incorporated herein, and the repeated parts are not repeated.

[0173] It is understandable that the user terminal may include a smart phone, a tablet electronic device, a network set-top box, a portable computer, a desktop computer, a personal digital assistant (PDA), a vehicle-mounted device, a smart wearable device, etc. Among them, the smart wearable device may include smart glasses, a smart watch, a smart bracelet, etc.

[0174] In practical applications, part of the analysis method of the power grid frequency security domain can be executed on the electronic device side as described above, or all operations can be completed in the client device. The specific selection can be based on the processing capability of the client device and the limitations of the user's usage scenario. This application does not limit this. If all operations are completed in the client device, the client device may also include a processor.

[0175] The client device may have a communication module (i.e., a communication unit) that can communicate with a remote server to achieve data transmission with the server. The server may include a server on the task scheduling center side, and other implementation scenarios may also include a server on an intermediate platform, such as a server on a third-party server platform that has a communication link with the task scheduling center server. The server may include a single computer device, or a server cluster consisting of multiple servers, or a server structure of a distributed device.

[0176] Fig.16 FIG. 9 is a schematic block diagram of the system structure of the electronic device 9600 according to an embodiment of the present application. Fig.16As shown, the electronic device 9600 may include a central processor 9100 and a memory 9140; the memory 9140 is coupled to the central processor 9100. It is worth noting that Fig.16 is exemplary; other types of structures may also be used to supplement or replace this structure to implement telecommunication functions or other functions.

[0177] In one embodiment, the analysis method function of the power grid frequency security domain may be integrated into the central processor 9100. The central processor 9100 may be configured to perform the following control:

[0178] S101: Determine an index affecting the frequency regulation capability of the power grid based on the total system load, the power generation output of the power source providing the primary frequency regulation service, the rated output of the power source providing the primary frequency regulation service, and the maximum power loss of the system when a single fault occurs in the system;

[0179] S102: Aggregating the total load of the system, the power generation output of the power source providing the primary frequency regulation service, the rated output of the power source providing the primary frequency regulation service, and the maximum power loss of the system when a single fault occurs in the system to obtain system frequency response model parameters;

[0180] S103: Inputting the system frequency response model parameters into a pre-built system frequency response model, and obtaining a power loss ratio value and a non-primary frequency regulation power output ratio value under the current primary frequency regulation power supply load rate according to the index affecting the power grid frequency regulation capability;

[0181] S104: Determine a system frequency safety domain according to a power loss percentage value and a non-primary frequency regulation power supply output percentage value under the current primary frequency regulation power supply load rate.

[0182] From the above description, it can be seen that the analysis method and device of the power grid frequency safety domain provided in the present application can determine the power loss proportion under the current primary frequency regulation power supply load rate and the power output proportion of the non-primary frequency regulation power supply according to the total system load, the power generation output of the power supply providing primary frequency regulation service, the rated output of the power supply providing primary frequency regulation service and the maximum power loss of the system when a single fault occurs in the system, thereby intuitively and effectively dividing the frequency safety domain and the frequency destruction domain, and quickly judging whether there is a frequency safety risk in the power grid according to the operation mode of the power grid and the possible power disturbance value.

[0183] In another embodiment, the analysis device of the grid frequency security domain can be configured separately from the central processing unit 9100. For example, the analysis device of the grid frequency security domain of the data composite transmission device can be configured as a chip connected to the central processing unit 9100, and the function of the analysis method of the grid frequency security domain can be realized through the control of the central processing unit.

[0184] like Fig.16As shown, the electronic device 9600 may also include: a communication module 9110, an input unit 9120, an audio processor 9130, a display 9160, and a power supply 9170. It is worth noting that the electronic device 9600 does not necessarily have to include Fig.16 In addition, the electronic device 9600 may also include Fig.16 For components not shown, reference may be made to the prior art.

[0185] like Fig.16 As shown, the central processing unit 9100 is sometimes also referred to as a controller or an operation control, and may include a microprocessor or other processor device and / or logic device. The central processing unit 9100 receives input and controls the operation of various components of the electronic device 9600.

[0186] The memory 9140 may be, for example, one or more of a cache, a flash memory, a hard drive, a removable medium, a volatile memory, a non-volatile memory or other suitable devices. The above-mentioned information related to the failure may be stored, and a program for executing the relevant information may also be stored. The CPU 9100 may execute the program stored in the memory 9140 to implement information storage or processing, etc.

[0187] The input unit 9120 provides input to the central processing unit 9100. The input unit 9120 is, for example, a key or a touch input device. The power supply 9170 is used to provide power to the electronic device 9600. The display 9160 is used to display display objects such as images and texts. The display may be, for example, an LCD display, but is not limited thereto.

[0188] The memory 9140 may be a solid-state memory, such as a read-only memory (ROM), a random access memory (RAM), a SIM card, etc. It may also be a memory that saves information even when the power is off, can be selectively erased, and is provided with more data, examples of which are sometimes referred to as EPROMs, etc. The memory 9140 may also be some other type of device. The memory 9140 includes a buffer memory 9141 (sometimes referred to as a buffer). The memory 9140 may include an application / function storage unit 9142, which is used to store application programs and function programs or processes for executing the operation of the electronic device 9600 through the central processor 9100.

[0189] The memory 9140 may also include a data storage unit 9143 for storing data, such as contacts, digital data, pictures, sounds, and / or any other data used by the electronic device. The driver storage unit 9144 of the memory 9140 may include various drivers for communication functions of the electronic device and / or for executing other functions of the electronic device (such as messaging applications, address book applications, etc.).

[0190] The communication module 9110 is a transmitter / receiver that sends and receives signals via the antenna 9111. The communication module (transmitter / receiver) 9110 is coupled to the central processor 9100 to provide input signals and receive output signals, which may be the same as the case of a conventional mobile communication terminal.

[0191] Based on different communication technologies, multiple communication modules 9110 may be provided in the same electronic device, such as a cellular network module, a Bluetooth module and / or a wireless LAN module. The communication module (transmitter / receiver) 9110 is also coupled to a speaker 9131 and a microphone 9132 via an audio processor 9130 to provide an audio output via the speaker 9131 and receive an audio input from the microphone 9132, thereby realizing a common telecommunication function. The audio processor 9130 may include any suitable buffer, decoder, amplifier, etc. In addition, the audio processor 9130 is also coupled to the central processor 9100, so that recording can be performed on the local machine through the microphone 9132, and the sound stored on the local machine can be played through the speaker 9131.

[0192] The embodiments of the present application also provide a computer-readable storage medium capable of implementing all steps of the method for analyzing a power grid frequency security domain in the above-mentioned embodiment, where the execution subject is a server or a client. The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, all steps of the method for analyzing a power grid frequency security domain in the above-mentioned embodiment are implemented, where the execution subject is a server or a client. For example, when the processor executes the computer program, the following steps are implemented:

[0193] S101: Determine an index affecting the frequency regulation capability of the power grid based on the total system load, the power generation output of the power source providing the primary frequency regulation service, the rated output of the power source providing the primary frequency regulation service, and the maximum power loss of the system when a single fault occurs in the system;

[0194] S102: Aggregating the total load of the system, the power generation output of the power source providing the primary frequency regulation service, the rated output of the power source providing the primary frequency regulation service, and the maximum power loss of the system when a single fault occurs in the system to obtain system frequency response model parameters;

[0195] S103: Inputting the system frequency response model parameters into a pre-built system frequency response model, and obtaining a power loss ratio value and a non-primary frequency regulation power output ratio value under the current primary frequency regulation power supply load rate according to the index affecting the power grid frequency regulation capability;

[0196] S104: Determine a system frequency safety domain according to a power loss percentage value and a non-primary frequency regulation power supply output percentage value under the current primary frequency regulation power supply load rate.

[0197] From the above description, it can be seen that the analysis method and device of the power grid frequency safety domain provided in the present application can determine the power loss proportion under the current primary frequency regulation power supply load rate and the power output proportion of the non-primary frequency regulation power supply according to the total system load, the power generation output of the power supply providing primary frequency regulation service, the rated output of the power supply providing primary frequency regulation service and the maximum power loss of the system when a single fault occurs in the system, thereby intuitively and effectively dividing the frequency safety domain and the frequency destruction domain, and quickly judging whether there is a frequency safety risk in the power grid according to the operation mode of the power grid and the possible power disturbance value.

[0198] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, devices, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0199] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (apparatus), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0200] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1A function specified in one or more boxes.

[0201] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0202] The present invention uses specific embodiments to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A method for analyzing power grid frequency security domain, characterized in that: include: Determine the indicators that affect the frequency regulation capability of the power grid based on the total system load, the power generation output of the power source providing primary frequency regulation service, the rated output of the power source providing primary frequency regulation service, and the maximum power loss of the system when a single fault occurs in the system; Aggregating the total load of the system, the power generation output of the power source providing primary frequency regulation service, the rated output of the power source providing primary frequency regulation service, and the maximum power loss of the system when a single fault occurs in the system to obtain system frequency response model parameters; Inputting the system frequency response model parameters into a pre-constructed system frequency response model, and obtaining the power loss ratio value and the non-primary frequency regulation power output ratio value under the current primary frequency regulation power supply load rate according to the index affecting the power grid frequency regulation capability; The system frequency safety domain is determined according to the power loss proportion value under the current primary frequency modulation power supply load rate and the non-primary frequency modulation power supply output proportion value.

2. The method for analyzing the power grid frequency security domain according to claim 1, characterized in that: The indicators that affect the frequency regulation capability of the power grid include the output ratio of primary frequency regulation power sources, the output ratio of non-primary frequency regulation power sources, the load rate of primary frequency regulation power sources, and the power loss ratio; the indicators that affect the frequency regulation capability of the power grid are determined based on the total system load, the power generation output of the power sources providing primary frequency regulation services, the rated output of the power sources providing primary frequency regulation services, and the maximum power loss of the system when a single fault occurs in the system, including: The ratio of the power generation output of the power supply providing the primary frequency regulation service to the total load of the system is determined as the primary frequency regulation power supply output ratio; The ratio of the power generation output of the power source that does not provide primary frequency regulation service to the total load of the system is determined as the non-primary frequency regulation power source output ratio; Determine the ratio of the power generation output of the power supply providing the primary frequency regulation service to the rated output of the power supply providing the primary frequency regulation service as the primary frequency regulation power supply load rate; The ratio of the maximum power lost by the system when a single fault occurs in the system to the total load of the system is determined as the power loss ratio.

3. The method for analyzing the power grid frequency security domain according to claim 1, characterized in that: The system frequency response model parameters include system inertia time constant, system equivalent damping, some parameters of the equivalent model of the generator prime mover speed regulator, and parameters of the aggregated limit and dead zone links; the system frequency response model parameters are obtained by aggregating the total load of the system, the power generation output of the power supply providing primary frequency regulation service, the rated output of the power supply providing primary frequency regulation service, and the maximum power loss of the system when a single fault occurs in the system, including: Calculating the system inertia time constant according to the generator set inertia time constant, the generator set kinetic energy, the total load of the system and the rated output of the power supply; Calculating the equivalent damping of the system according to the ratio of the rated power of the generator set to the total load of the system, the ratio of the load power to the total load power of the system, the equivalent damping of the generator set and the load equivalent frequency adjustment coefficient; Calculating some parameters of the equivalent model of the generator prime mover speed governor according to the ratio of the rated power of the generator set to the total load of the system and the primary frequency regulation coefficient of the generator set; The parameters of the aggregated amplitude limiting and dead zone link are calculated according to the parameters of the amplitude limiting and dead zone link of each generator in the generator set and the load power.

4. The method for analyzing the power grid frequency security domain according to claim 2, characterized in that: The inputting of the system frequency response model parameters into a pre-built system frequency response model, and obtaining the power loss proportion value and the non-primary frequency regulation power supply output proportion value under the current primary frequency regulation power supply load rate according to the index affecting the power grid frequency regulation capability, includes: Respectively set the value ranges of the primary frequency modulation power supply output ratio, the non-primary frequency modulation power supply output ratio, the primary frequency modulation power supply load rate and the power loss ratio; The system frequency response model is called for simulation according to the value range. When the maximum system frequency value obtained by simulation exceeds the defense value, the power loss proportion value under the current primary frequency modulation power supply load rate and the current non-primary frequency modulation power supply output proportion value are recorded.

5. The method for analyzing the power grid frequency security domain according to claim 1, characterized in that: The determining of the system frequency safety domain according to the power loss proportion value under the current primary frequency modulation power supply load rate and the non-primary frequency modulation power supply output proportion value includes: With the power loss proportion under the current primary frequency modulation power supply load rate as the X-axis and the non-primary frequency modulation power supply output proportion as the Y-axis, the frequency safety critical coordinate points are fitted to draw the system frequency safety domain.

6. A device for analyzing power grid frequency security domain, characterized in that: include: An index determination unit, used to determine an index affecting the frequency regulation capability of the power grid according to the total load of the system, the power generation output of the power source providing the primary frequency regulation service, the rated output of the power source providing the primary frequency regulation service, and the maximum power loss of the system when a single fault occurs in the system; a parameter aggregation unit, for aggregating the total load of the system, the power generation output of the power source providing the primary frequency regulation service, the rated output of the power source providing the primary frequency regulation service, and the maximum power loss of the system when a single fault occurs in the system, to obtain system frequency response model parameters; A proportion calculation unit, used for inputting the system frequency response model parameters into a pre-built system frequency response model, and obtaining a power loss proportion value and a non-primary frequency regulation power output proportion value under the current primary frequency regulation power supply load rate according to the index affecting the power grid frequency regulation capability; The safety area determination unit is used to determine the system frequency safety domain according to the power loss proportion value and the non-primary frequency modulation power supply output proportion value under the current primary frequency modulation power supply load rate.

7. The power grid frequency security domain analysis device according to claim 6, characterized in that: The indicators affecting the frequency regulation capability of the power grid include the output ratio of primary frequency regulation power sources, the output ratio of non-primary frequency regulation power sources, the load rate of primary frequency regulation power sources and the power loss ratio; the indicator determination unit includes: A first output ratio determination module, configured to determine the ratio of the power generation output of the power supply providing the primary frequency regulation service to the total load of the system as the output ratio of the primary frequency regulation power supply; A second output ratio determination module is used to determine the ratio of the power generation output of the power source that does not provide primary frequency regulation service to the total load of the system as the output ratio of the non-primary frequency regulation power source; A power supply load determination module, configured to determine the ratio of the power generation output of the power supply providing the primary frequency regulation service to the rated output of the power supply providing the primary frequency regulation service as the primary frequency regulation power supply load rate; The loss ratio determination module is used to determine the power loss ratio by taking the ratio of the maximum power lost by the system to the total load of the system when a single fault occurs in the system.

8. The power grid frequency security domain analysis device according to claim 6, characterized in that: The system frequency response model parameters include system inertia time constant, system equivalent damping, some parameters of the generator prime mover speed regulator equivalent model, and parameters of the aggregate limiter and dead zone link; The parameter aggregation unit includes: A time constant determination module, used for calculating the system inertia time constant according to the generator set inertia time constant, the generator set kinetic energy, the system total load and the rated output of the power supply; An equivalent damping determination module, used for calculating the equivalent damping of the system according to the ratio of the rated power of the generator set to the total load of the system, the ratio of the load power to the total load power of the system, the equivalent damping of the generator set and the load equivalent frequency adjustment coefficient; A partial parameter determination module, used for calculating partial parameters of the equivalent model of the generator prime mover speed governor according to the ratio of the rated power of the generator set to the total load of the system and the primary frequency regulation coefficient of the generator set; The limiting dead zone determination module is used to calculate the parameters of the aggregate limiting and dead zone link according to the parameters of the limiting and dead zone links of each generator in the generator set and the load power.

9. The power grid frequency security domain analysis device according to claim 7, characterized in that: The proportion calculation unit includes: A value range determination module, used to respectively set the value ranges of the primary frequency modulation power supply output ratio, the non-primary frequency modulation power supply output ratio, the primary frequency modulation power supply load rate and the power loss ratio; The proportion recording module is used to call the system frequency response model for simulation according to the value range. When the maximum system frequency value obtained by simulation exceeds the defense value, the power loss proportion value under the current primary frequency modulation power supply load rate and the current non-primary frequency modulation power supply output proportion value are recorded.

10. The power grid frequency security domain analysis device according to claim 6, characterized in that: The safety area determination unit is specifically used to fit the frequency safety critical coordinate points with the power loss proportion under the current primary frequency modulation power supply load rate as the X-axis and the non-primary frequency modulation power supply output proportion as the Y-axis to draw the system frequency safety domain.

11. 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, the steps of the method for analyzing the power grid frequency security domain described in any one of claims 1 to 5 are implemented.

12. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for analyzing the power grid frequency security domain described in any one of claims 1 to 5 are implemented.

13. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instruction is executed by a processor, the steps of the method for analyzing the power grid frequency security domain described in any one of claims 1 to 5 are implemented.

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