CN117875002A - Numerical simulation-based method and system for selecting addresses of additional damping controllers of speed regulator - Google Patents
Numerical simulation-based method and system for selecting addresses of additional damping controllers of speed regulator Download PDFInfo
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Abstract
The invention discloses a method and a system for selecting the address of an additional damping controller of a speed regulator based on numerical simulation, wherein the method comprises the following steps: collecting unit data of a power grid at a transmitting end, and constructing a complete electromechanical simulation model of the power grid at the high-proportion water transmitting end; mechanical power fluctuation analysis is carried out on the units in the simulation model, the units are sequenced from big to small according to peak-to-peak values, load fault simulation is carried out on the units, and a unit frequency fluctuation curve is output; and calculating oscillation frequency and damping ratio according to the unit frequency fluctuation curve, and determining the installation place of the additional damping controller of the speed regulator according to the dominant oscillation frequency and damping ratio. The method determines the installation site priority of the additional damping controller of the high-proportion water-electricity transmission end power grid speed regulator through the numerical simulation of the large-scale network and the single-machine calculation example, and can effectively promote the damping of the ultra-low frequency band of the power grid with smaller installation quantity, thereby effectively and orderly promoting the large-scale application of the additional damping controller of the speed regulator.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a speed regulator additional damping controller site selection method and system based on numerical simulation.
Background
Southwest hydropower is sent out through extra-high voltage direct current, and when the power grid at the sending end has large disturbance such as disconnection of a multi-circuit alternating current line, direct current blocking and the like, the frequency control of the system at the sending end is difficult. In particular, when the system networking morphology changes, the system frequency may present a risk of ultralow frequency oscillations. Methods for suppressing the ultralow frequency oscillation can be classified into three types: firstly, reducing PID parameters of a speed regulator; secondly, restraining ultralow frequency oscillation by means of direct current equipment; thirdly, an additional damping control link is added in the speed regulator. However, obvious defects exist in reducing PID parameters of the speed regulator, the defects of insufficient primary frequency modulation of a unit and frequent system frequency fluctuation are caused by too small PID parameters, and ultralow frequency oscillation of a transmitting end system is transmitted to a receiving end system by means of direct current equipment, so that an additional damping controller of the speed regulator becomes the optimal choice, and only the input power of a prime motor of the unit is changed without participating in the change of electromagnetic power of the system, and other stability of the system is not affected.
Disclosure of Invention
The present invention has been made in view of the above-described problems.
Therefore, the technical problems solved by the invention are as follows: the frequency control of the prior art transmitting end system is difficult, and the system frequency has the risk of ultralow frequency oscillation.
In order to solve the technical problems, the invention provides the following technical scheme: the method for selecting the address of the additional damping controller of the speed regulator based on numerical simulation comprises the following steps: collecting unit data of a power grid at a transmitting end, and constructing a complete electromechanical simulation model of the power grid at the high-proportion water transmitting end; mechanical power fluctuation analysis is carried out on the units in the simulation model, the units are sequenced from big to small according to peak-to-peak values, load fault simulation is carried out on the units, and a unit frequency fluctuation curve is output; and calculating oscillation frequency and damping ratio according to the unit frequency fluctuation curve, and determining the installation place of the additional damping controller of the speed regulator according to the dominant oscillation frequency and damping ratio.
As a preferable scheme of the method for selecting the address of the additional damping controller of the speed regulator based on numerical simulation, the invention comprises the following steps: the unit data of the power transmission network comprises unit characteristic data, power network structure data, historical operation data, real-time data, dynamic data and transient data, unit screening conditions of a speed regulator additional damping controller to be installed on the high-proportion water power transmission network are set according to the collected data, and a unit to be selected is determined.
As a preferable scheme of the method for selecting the address of the additional damping controller of the speed regulator based on numerical simulation, the invention comprises the following steps: the electromechanical simulation model comprises that DC blocking or power-off fault of a power grid unit at a transmitting end is simulated by simulation software, a mechanical power fluctuation curve of the unit to be selected is output,
P gen,i(t) i∈G,t∈[t 0 ,t end ]
wherein P is gen,i(t) The mechanical power of the ith unit to be selected at the time t is represented; g represents the total number of the unit to be selected; t is t 0 Representing a simulation start time; t is t end Indicating the end time of the simulation.
As a preferable scheme of the method for selecting the address of the additional damping controller of the speed regulator based on numerical simulation, the invention comprises the following steps: the mechanical power fluctuation analysis comprises the steps of carrying out per unit treatment on the mechanical power fluctuation curve of the unit to be selected,
the peak-to-peak value of the mechanical power fluctuation curve after per unit of the unit to be selected is counted,
PPV gen,i ＝max(P' gen,i(t) )-min(P' gen,i(t) )
wherein PN (Positive and negative) i The rated capacity of the ith unit to be selected is represented; PPV (Point-to-Point) type gen,i And (5) representing the peak value of the mechanical power fluctuation curve after per unit of the ith unit to be selected.
As a preferable scheme of the method for selecting the address of the additional damping controller of the speed regulator based on numerical simulation, the invention comprises the following steps: the load fault simulation comprises the steps that the number of additional damping controllers provided with a speed regulator is set to be M, a single-machine on-load calculation example is constructed by taking the first 2M units according to the peak-to-peak value of the per-unit mechanical power fluctuation curve, a generator is connected with a node 1, a node 2 is connected with the node 1 through a transformer, a node 3 is connected with the node 2 through a circuit, a 10MW load is arranged on a bus of the node 2, and a 90MW load is arranged on a bus of the node 3; and respectively carrying out node 2 busbar cut 10MW load fault simulation on 2M units, and outputting a unit frequency fluctuation curve.
As a preferable scheme of the method for selecting the address of the additional damping controller of the speed regulator based on numerical simulation, the invention comprises the following steps: the oscillation frequency and damping ratio comprises fitting equidistant sampling data of the unit frequency fluctuation curve by a linear combination of exponential functions by using a Prony analysis method,
comparing all fitted oscillation components A n Setting the component with the largest amplitude as A max ，
Wherein F (t) k ) Representing equidistant sampled data; a is that n Representing the nth oscillationThe magnitude of the component; alpha n Represents the damping ratio dependent decay rate; omega n Representing the angular frequency of the oscillation; t is t k Time representing the kth sampling point; phi (phi) n Indicating the phase angle; epsilon k Representing an error term between the model and the actual data; f (f) max Representing the dominant oscillation frequency; omega max Representing the maximum oscillation component A of amplitude max Is a frequency of an angle of (a); zeta type max Representation A max A corresponding damping ratio; alpha max Representing the maximum oscillation component A of amplitude max Corresponding decay rate.
As a preferable scheme of the method for selecting the address of the additional damping controller of the speed regulator based on numerical simulation, the invention comprises the following steps: determining the installation site of the additional damping controller of the speed regulator comprises the steps of according to historical data and zeta max Setting damping ratio threshold ζ h When the oscillating frequency of the unit is less than 0.1Hz and the damping ratio is less than ζ h When the unit is a place where the speed regulator is additionally provided with a damping controller; when the oscillating frequency of the unit is more than or equal to 0.1Hz and the damping ratio is less than ζ h When the speed regulator is used, the performance of the unit is monitored and evaluated regularly, and the unit is a place where the damping controller is arranged for the speed regulator to be selected; when the damping ratio of the unit is more than or equal to zeta h And is not considered to be the installation place of the additional damping controller of the speed regulator.
The invention also provides a speed regulator additional damping controller site selection system based on numerical simulation, which comprises a data acquisition module, a data processing module and a data processing module, wherein the data acquisition module acquires unit data of a power transmission end power grid, sets unit screening conditions of the speed regulator additional damping controller to be installed on the high-proportion water power transmission end power grid, determines a unit to be selected and constructs a complete electromechanical simulation model of the high-proportion water power transmission end power grid; the data analysis module is used for carrying out mechanical power fluctuation analysis according to the established simulation model, sequencing the units from large to small according to peak-to-peak values, constructing a single-unit on-load calculation example, carrying out load fault simulation on the units and outputting a unit frequency fluctuation curve; and the position determining module is used for calculating the amplitude, the frequency and the damping ratio of the frequency oscillation component according to equidistant sampling data of the unit frequency fluctuation curve by using a Prony analysis method, and further determining the installation place of the additional damping controller of the speed regulator.
In a third aspect, the present invention also provides a computing device comprising: a memory and a processor;
the memory is used for storing computer executable instructions, and the processor is used for executing the computer executable instructions, and the computer executable instructions realize the steps of the numerical simulation-based speed regulator additional damping controller address selection method when being executed by the processor.
In a fourth aspect, the present invention also provides a computer readable storage medium storing computer executable instructions that when executed by a processor implement the steps of the numerical simulation based method for addressing a governor additional damping controller.
The invention has the beneficial effects that: the method determines the installation site priority of the additional damping controller of the high-proportion water-electricity transmission end power grid speed regulator through the numerical simulation of the large-scale network and the single-machine calculation example, and can effectively promote the damping of the ultra-low frequency band of the power grid with smaller installation quantity, thereby effectively and orderly promoting the large-scale application of the additional damping controller of the speed regulator.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
FIG. 1 is a general flow chart of a method for locating an additional damping controller of a speed governor based on numerical simulation according to an embodiment of the present invention;
FIG. 2 is a graph showing the mechanical power fluctuation of a method for locating an additional damping controller of a speed governor based on numerical simulation according to a second embodiment of the present invention;
FIG. 3 is a graph of per unit mechanical power fluctuation of a method for locating an additional damping controller of a governor based on numerical simulation according to a second embodiment of the present invention;
FIG. 4 is a diagram of a single machine with load calculation for a method for locating an additional damping controller for a speed governor based on numerical simulation according to a second embodiment of the present invention;
FIG. 5 is a graph showing the frequency fluctuation of a machine set of a method for selecting an additional damping controller of a speed governor based on numerical simulation according to a second embodiment of the present invention.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
Example 1
Referring to fig. 1, for one embodiment of the present invention, a method for locating an additional damping controller of a speed governor based on numerical simulation is provided, including:
s1: and collecting unit data of the power transmission network, and constructing a complete electromechanical simulation model of the high-proportion water power transmission network.
Further, the unit data of the power grid at the power transmission end comprise unit characteristic data, power grid structure data, historical operation data, real-time data, dynamic data and transient data, unit screening conditions of the additional damping controller of the speed regulator to be installed on the power grid at the power transmission end of the high-proportion water power transmission end are set according to the collected data, and a unit to be selected is determined.
In screening, those units with larger capacity are generally preferentially considered, the influence of the large-capacity units on the power grid is more remarkable, so that the stability of the large-capacity units is particularly important for the whole system, meanwhile, units sensitive to frequency adjustment and load change response are preferentially considered, and units showing larger fluctuation or instability in the past are screened based on historical operation data and unit performance.
Because the additional damping controllers of the speed regulators cannot be installed on all the units, the units are subjected to preliminary screening, the stability of the whole power grid can be remarkably improved by installing the damping controllers on the key units, the unstable risk in the operation of the system is effectively reduced, and the limited resources can be ensured to be used in the most needed places, so that the maximum stability improvement is realized at the lowest cost.
Furthermore, a detailed power grid model is constructed according to the collected data, wherein the detailed power grid model comprises all relevant hydroelectric generating sets, power transmission lines, transformers and other power grid elements, and specific fault scenes such as direct current blocking or power grid unit tripping at a transmitting end are introduced into the simulation. Starting simulation, recording the mechanical power of each unit, outputting a mechanical power fluctuation curve of the unit to be selected,
P gen,i(t) i∈G,t∈[t 0 ,t end ]
wherein P is gen,i(t) The mechanical power of the ith unit to be selected at the time t is represented; g represents the total number of the unit to be selected; t is t 0 Representing a simulation start time; t is t end Indicating the end time of the simulation.
It should be noted that, when screening the unit to be selected, in addition to considering the capacity and sensitivity to frequency adjustment and load variation of the unit, other factors, such as operation history, position, interconnectivity with the power grid, and historical stability performance, need to be comprehensively considered. The comprehensive consideration ensures that the selected unit is not only suitable for installing an additional damping controller in theory, but also can effectively improve the stability of the whole power grid in actual operation.
S2: and (3) carrying out mechanical power fluctuation analysis on the units in the simulation model, sequencing the units according to the peak-to-peak value from large to small, carrying out load fault simulation on the units and outputting a unit frequency fluctuation curve.
Further, the mechanical power fluctuation analysis comprises the per unit processing of the mechanical power fluctuation curve of the unit to be selected, and as the rated capacity of different units may be different, the direct comparison of the original mechanical power fluctuation data cannot correctly reflect the difference of the units, the fluctuation of different units can be compared on the basis of the same proportion by per unit processing of the mechanical power,
the per unit process eliminates the impact of unit size on the analysis, concentrating on the dynamic behavior itself of the units when analyzing volatility, rather than its scale, and by per unit it is easier to identify which units fluctuate more than they do on a capacity basis.
And counting the peak value (PPV) of the mechanical power fluctuation curve after per unit of the unit to be selected, wherein the peak value (PPV) is an important index for measuring the fluctuation amplitude, and the peak value represents the extremely poor mechanical power fluctuation of each unit.
PPV gen,i ＝max(P' gen,i(t) )-min(P' gen,i(t) )
Wherein PN (Positive and negative) i The rated capacity of the ith unit to be selected is represented; PPV (Point-to-Point) type gen,i And (5) representing the peak value of the mechanical power fluctuation curve after per unit of the ith unit to be selected. The units with larger peak-to-peak values show larger instability under specific conditions, so that candidate objects for installing additional damping controllers can be further screened according to the peak-to-peak value size sequence, and a quantized index is provided for measuring and comparing the fluctuation of different units, so that the selection process is more objective and data driven.
Furthermore, the number of the additional damping controllers of the speed regulator is set as M, a single-machine on-load calculation example is constructed by taking the first 2M units according to the peak-to-peak value of the per-unit mechanical power fluctuation curve, the generator is connected with the node 1, the node 2 is connected with the node 1 through a transformer, the node 3 is connected with the node 2 through a circuit, a 10MW load is arranged on a bus of the node 2, and a 90MW load is arranged on a bus of the node 3; and respectively carrying out node 2 busbar cut 10MW load fault simulation on 2M units, and outputting a unit frequency fluctuation curve.
When a single machine set is selected to construct a single machine on-load calculation example, the number of the selected machine sets is determined based on the number of additional damping controllers for installing the speed regulator and by combining the complexity of a power grid structure and comprehensive consideration of historical data. The larger power grid needs to select more units for comprehensive analysis, and if the power grid has a plurality of key nodes or complex interconnection relations, the number of the units needs to be increased; and meanwhile, historical operation data of the units are reviewed, and if a power grid has units with large-scale disturbance or overstability problems, the number of the selected units needs to be increased, and the installation scale of the additional damping controller of the speed regulator is further enlarged.
The frequency fluctuation curve of the unit produced by the load fault simulation provides detailed information about the frequency response of the unit, and the stability and frequency modulation capability of the unit in the face of sudden load change can be revealed. By analyzing the frequency fluctuation curve of the units, the units which are poor in frequency control can be further screened out, so that the selected units are ensured to be the most critical to the improvement of the stability of the whole power grid when the place for installing the additional damping controller is finally determined.
S3: and calculating oscillation frequency and damping ratio according to the unit frequency fluctuation curve, and determining the installation place of the additional damping controller of the speed regulator according to the dominant oscillation frequency and damping ratio.
Furthermore, in the stability analysis of the power system, the Prony analysis method is a powerful tool for extracting the oscillation mode from the time series data, and when the method is applied to the analysis of the frequency fluctuation curve, the dynamic behavior of the power grid can be revealed.
Equidistant sampling points are extracted from the frequency fluctuation curve, prony analysis is applied to fit the sampling data to a linear combination of a plurality of exponential functions, then a least square method and other techniques are used to estimate the parameters of each exponential term, for each exponential term, the amplitude, frequency and attenuation rate of oscillation are calculated, the attenuation rate can be further converted into a damping ratio,
the oscillating components are ordered according to their magnitude, with larger magnitude components generally representing more pronounced dynamic behavior in the system. Selecting the oscillation component with the largest amplitude, the frequency of which is regarded as the dominant oscillation frequency of the system, andthe damping ratio corresponding to this component is recorded. Comparing all fitted oscillation components A n Setting the component with the largest amplitude as A max ，
Wherein F (t) k ) Representing equidistant sampled data; a is that n Representing the amplitude of the nth oscillation component; alpha n Represents the damping ratio dependent decay rate; omega n Representing the angular frequency of the oscillation; t is t k Time representing the kth sampling point; phi (phi) n Indicating the phase angle; epsilon k Representing an error term between the model and the actual data; f (f) max Representing the dominant oscillation frequency; omega max Representing the maximum oscillation component A of amplitude max Is a frequency of an angle of (a); zeta type max Representation A max A corresponding damping ratio; alpha max Representing the maximum oscillation component A of amplitude max Corresponding decay rate.
Further, determining the location of the governor additional damping controller includes, based on historical data and ζ max Setting damping ratio threshold ζ h When the oscillating frequency of the unit is less than 0.1Hz and the damping ratio is less than ζ h When the unit is a place where the speed regulator is additionally provided with a damping controller; when the oscillating frequency of the unit is more than or equal to 0.1Hz and the damping ratio is less than ζ h When the speed regulator is used, the performance of the unit is monitored and evaluated regularly, and the unit is a place where the damping controller is arranged for the speed regulator to be selected; when the damping ratio of the unit is more than or equal to zeta h And is not considered to be the installation place of the additional damping controller of the speed regulator.
It should be noted that, when the installation of the additional damping controller is considered, a comprehensive system analysis should be performed, and factors other than the oscillation frequency and the damping ratio of the unit, such as the overall structure of the power grid, the geographical position of the unit, the operation mode, and the like, are considered.
The damping control strategy should be dynamic and can be adjusted according to the actual condition of the power grid, for example, the damping ratio is higher than ζ originally as the condition of the power grid changes h May require additional damping control in the future.
The embodiment also provides a speed regulator additional damping controller address selecting system based on numerical simulation, which is characterized by comprising,
the data acquisition module acquires unit data of a power grid at a transmission end, sets unit screening conditions of a speed regulator additional damping controller to be installed on the power grid at a high-proportion water transmission end, determines a unit to be selected and builds a complete electromechanical simulation model of the power grid at the high-proportion water transmission end; the data analysis module is used for carrying out mechanical power fluctuation analysis according to the established simulation model, sequencing the units from large to small according to peak-to-peak values, constructing a single-unit on-load calculation example, carrying out load fault simulation on the units and outputting a unit frequency fluctuation curve; and the position determining module is used for calculating the amplitude, the frequency and the damping ratio of the frequency oscillation component according to equidistant sampling data of the unit frequency fluctuation curve by using a Prony analysis method, and further determining the installation place of the additional damping controller of the speed regulator.
The present embodiment also provides a computing device comprising, a memory and a processor; the memory is used for storing computer executable instructions, and the processor is used for executing the computer executable instructions to realize the method for realizing the address selection of the additional damping controller of the speed regulator based on numerical simulation, which is proposed by the embodiment.
The present embodiment also provides a storage medium having stored thereon a computer program which, when executed by a processor, implements the speed governor additional damping controller addressing method based on numerical simulation as set forth in the above embodiment.
The storage medium proposed in this embodiment belongs to the same inventive concept as the method for selecting addresses of the additional damping controller of the speed governor based on numerical simulation proposed in the above embodiment, and technical details not described in detail in this embodiment can be seen in the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.
From the above description of embodiments, it will be clear to a person skilled in the art that the present invention may be implemented by means of software and necessary general purpose hardware, but of course also by means of hardware, although in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as a floppy disk, a Read Only Memory (ROM), a random access Memory (RandomAccessMemory, RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, etc., including several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to execute the method of the embodiments of the present invention.
Example 2
Referring to fig. 2-5, for one embodiment of the present invention, a method for locating an additional damping controller of a speed governor based on numerical simulation is provided, and in order to verify the beneficial effects of the present invention, scientific demonstration is performed through simulation experiments.
In the embodiment, historical data of a power grid at a certain transmitting end is selected as collected data, a simulation model is built, and screening conditions are that rated capacity of a unit is required to be larger than 100MW.
The simulation direct current is blocked or the power transmission end power grid unit jumps the machine fault, output the mechanical power fluctuation curve of the unit to be selected, then carry on per unit processing to the mechanical power fluctuation curve, 858 when the peak value of the mechanical power fluctuation curve is 3s as shown in figure 2, represent the maximum output that the mechanical power of the unit reaches, here the maximum response of the unit after the power transmission end power grid unit jumps the machine fault, the height of the peak value indicates the response intensity of the unit, and the energy that the system needs to absorb after disturbance. 773 for a 9s trough of the mechanical power fluctuation curve represents the minimum output reached by the mechanical power of the unit. The average value at unit operation is approximately 820, which can be considered to be the typical power output of a unit when it returns to steady state without or after a disturbance.
According to the per-unit mechanical power fluctuation curve, counting the peak value of the mechanical power fluctuation curve of each unit to be selected, sorting the unit to be selected according to the peak value from big to small, taking the first 2M units to construct a single-machine on-load calculation example, calculating, for example, as shown in fig. 3, respectively carrying out node 2 busbar cutting 10MW load fault simulation on the 2M units, and outputting a unit frequency fluctuation curve, wherein the curve is shown in fig. 5.
The method comprises the steps of fitting equidistant sampling data of a frequency fluctuation curve by using a linear combination of exponential functions by using a Prony analysis method, calculating amplitude, frequency and damping ratio of frequency oscillation components, sequencing from large to small according to the amplitude of the oscillation components, obtaining dominant oscillation frequency of rank 1, calculating corresponding damping ratio, and finally obtaining data shown in a table below.
Table 1 table of experimental data
In this example, the screening conditions were oscillation frequency less than 0.1Hz and damping ratio less than 0.05, and from experimental data, the selected units exhibited relatively large power fluctuations and low stability, indicating that they may play a key role in the stability of the power system. By installing additional damping controllers on the units, the invention can effectively improve the stability of the power system, and is particularly helpful for reducing power fluctuation and enhancing the resistance of the system to disturbance when facing faults or disturbance. This not only helps to prevent possible power system crashes, but also can optimize the configuration of resources, ensuring that limited cost and technical resources are put into the place where they are most needed, thereby improving the operational efficiency and reliability of the overall power system.
It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered in the scope of the claims of the present invention.
Claims (10)
1. The method for selecting the address of the additional damping controller of the speed regulator based on numerical simulation is characterized by comprising the following steps of:
collecting unit data of a power grid at a transmitting end, and constructing a complete electromechanical simulation model of the power grid at the high-proportion water transmitting end;
mechanical power fluctuation analysis is carried out on the units in the simulation model, the units are sequenced from big to small according to peak-to-peak values, load fault simulation is carried out on the units, and a unit frequency fluctuation curve is output;
and calculating oscillation frequency and damping ratio according to the unit frequency fluctuation curve, and determining the installation place of the additional damping controller of the speed regulator according to the dominant oscillation frequency and damping ratio.
2. The method for locating an additional damping controller of a speed regulator based on numerical simulation according to claim 1, wherein the method comprises the following steps: the unit data of the power transmission network comprises unit characteristic data, power network structure data, historical operation data, real-time data, dynamic data and transient data, unit screening conditions of a speed regulator additional damping controller to be installed on the high-proportion water power transmission network are set according to the collected data, and a unit to be selected is determined.
3. The method for locating the additional damping controller of the speed regulator based on numerical simulation according to claim 2, wherein the method comprises the following steps of: the electromechanical simulation model comprises that DC blocking or power-off fault of a power grid unit at a transmitting end is simulated by simulation software, a mechanical power fluctuation curve of the unit to be selected is output,
P gen,i(t) i∈G,t∈[t 0 ,t end ]
wherein P is gen,i(t) The mechanical power of the ith unit to be selected at the time t is represented; g represents the total number of the unit to be selected; t is t 0 Representing a simulation start time; t is t end Indicating the end time of the simulation.
4. The method for locating an additional damping controller of a speed regulator based on numerical simulation according to claim 3, wherein the method comprises the following steps: the mechanical power fluctuation analysis comprises the steps of carrying out per unit treatment on the mechanical power fluctuation curve of the unit to be selected,
the peak-to-peak value of the mechanical power fluctuation curve after per unit of the unit to be selected is counted,
PPV gen,i ＝max(P' gen,i(t) )-min(P' gen,i(t) )
wherein PN (Positive and negative) i The rated capacity of the ith unit to be selected is represented; PPV (Point-to-Point) type gen,i And (5) representing the peak value of the mechanical power fluctuation curve after per unit of the ith unit to be selected.
5. The method for locating an additional damping controller of a speed regulator based on numerical simulation according to claim 4, wherein the method comprises the following steps: the load fault simulation comprises the steps that the number of additional damping controllers provided with a speed regulator is set to be M, a single-machine on-load calculation example is constructed by taking the first 2M units according to the peak-to-peak value of the per-unit mechanical power fluctuation curve, a generator is connected with a node 1, a node 2 is connected with the node 1 through a transformer, a node 3 is connected with the node 2 through a circuit, a 10MW load is arranged on a bus of the node 2, and a 90MW load is arranged on a bus of the node 3;
and respectively carrying out node 2 busbar cut 10MW load fault simulation on 2M units, and outputting a unit frequency fluctuation curve.
6. The method for locating an additional damping controller of a speed regulator based on numerical simulation according to claim 5, wherein the method comprises the following steps: the oscillation frequency and damping ratio comprises fitting equidistant sampling data of the unit frequency fluctuation curve by a linear combination of exponential functions by using a Prony analysis method,
comparing all fitted oscillation components A n Setting the component with the largest amplitude as A max ，
Wherein F (t) k ) Representing equidistant sampled data; a is that n Representing the amplitude of the nth oscillation component; alpha n Represents the damping ratio dependent decay rate; omega n Representing the angular frequency of the oscillation; t is t k Time representing the kth sampling point; phi (phi) n Indicating the phase angle; epsilon k Representing an error term between the model and the actual data; f (f) max Representing the dominant oscillation frequency; omega max Representing the maximum oscillation component A of amplitude max Is a frequency of an angle of (a); zeta type max Representation A max A corresponding damping ratio; alpha max Representing the maximum oscillation component A of amplitude max Corresponding decay rate.
7. The numerical simulation-based method for locating an additional damping controller of a speed regulator according to claim 6, wherein: determining the installation site of the additional damping controller of the speed regulator comprises the steps of according to historical data and zeta max Setting damping ratio threshold ζ h When the oscillating frequency of the unit is less than 0.1Hz and the damping ratio is less than ζ h When the unit is a place where the speed regulator is additionally provided with a damping controller;
when the oscillating frequency of the unit is more than or equal to 0.1Hz and the damping ratio is less than ζ h When the speed regulator is used, the performance of the unit is monitored and evaluated regularly, and the unit is a place where the damping controller is arranged for the speed regulator to be selected;
when the damping ratio of the unit is more than or equal to zeta h When not considered asThe speed governor is attached to the location where the damping controller is installed.
8. A speed regulator additional damping controller address selecting system based on numerical simulation by adopting the method as set forth in any one of claims 1-7, which is characterized by comprising,
the data acquisition module acquires unit data of a power grid at a transmission end, sets unit screening conditions of a speed regulator additional damping controller to be installed on the power grid at a high-proportion water transmission end, determines a unit to be selected and builds a complete electromechanical simulation model of the power grid at the high-proportion water transmission end;
the data analysis module is used for carrying out mechanical power fluctuation analysis according to the established simulation model, sequencing the units from large to small according to peak-to-peak values, constructing a single-unit on-load calculation example, carrying out load fault simulation on the units and outputting a unit frequency fluctuation curve;
and the position determining module is used for calculating the amplitude, the frequency and the damping ratio of the frequency oscillation component according to equidistant sampling data of the unit frequency fluctuation curve by using a Prony analysis method, and further determining the installation place of the additional damping controller of the speed regulator.
9. A computing device, comprising: a memory and a processor;
the memory is for storing computer executable instructions, the processor being for executing the computer executable instructions which when executed by the processor implement the steps of the method of any one of claims 1 to 7.
10. A computer readable storage medium storing computer executable instructions which when executed by a processor implement the steps of the method of any one of claims 1 to 7.
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