CN114123236A - Frequency response control method and device for power electronic equipment - Google Patents
Frequency response control method and device for power electronic equipment Download PDFInfo
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- CN114123236A CN114123236A CN202111302178.8A CN202111302178A CN114123236A CN 114123236 A CN114123236 A CN 114123236A CN 202111302178 A CN202111302178 A CN 202111302178A CN 114123236 A CN114123236 A CN 114123236A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
Abstract
The invention provides a frequency response control method and a frequency response control device of power electronic equipment, which are used for establishing a transfer function for controlling the frequency response of the power electronic equipment, and determining the optimal value combination of a proportionality coefficient and a time delay coefficient in the transfer function by taking the maximum frequency deviation of the power electronic equipment as the minimum and the output active power peak value as the minimum, thereby fully considering the advantage of flexible power output of the power electronic equipment, and realizing a better frequency modulation effect on the basis of lower output active power of the power electronic equipment by utilizing the transfer function, thereby improving the frequency modulation capability of the power electronic equipment.
Description
Technical Field
The invention relates to the technical field of power grids, in particular to a frequency response control method and device of power electronic equipment.
Background
With the continuous improvement of the permeability of renewable energy sources such as wind power and photovoltaic, continuous operation of high-capacity direct current projects and obvious safety problems of power grid frequency, the virtual inertia control of power electronic equipment (including related equipment such as wind power, photovoltaic and battery energy storage) is utilized to realize quick frequency response so as to improve the frequency modulation capability of a power system, and the method is an effective measure for ensuring the safety of the power grid frequency in a new state.
However, the core idea of the existing virtual inertia control mode is to simulate the response characteristic of the rotor inertia of the synchronous generator, the advantage of flexible power output of the power electronic equipment is not fully considered, and the frequency modulation capability of the power electronic equipment cannot be exerted to the maximum extent.
Disclosure of Invention
The invention provides a frequency response control method and a frequency response control device for power electronic equipment, which are used for overcoming the defect that the frequency modulation capability of the power electronic equipment cannot be fully exerted due to the fact that the advantage of flexible power output of the power electronic equipment is not fully considered in a virtual inertia control mode in the prior art.
In a first aspect, the present invention provides a method for controlling frequency response of a power electronic device, the method comprising:
establishing a transfer function for power electronic device frequency response control; the transfer function takes frequency deviation as input and frequency modulation power as output, and expresses the relation between the frequency deviation and the frequency modulation power through a proportionality coefficient and a time delay coefficient;
respectively determining the value range of the proportionality coefficient and the corresponding value range of the time delay coefficient under the value of each proportionality coefficient to obtain a value set of the proportionality coefficient and the time delay coefficient;
determining the optimal value combination of the proportionality coefficient and the time delay coefficient from the value set by taking the minimum maximum frequency deviation and the minimum output active power peak value of the power electronic equipment as targets; the maximum frequency deviation is the maximum value of the frequency deviation after frequency response control is carried out on the transfer function, and the output active power peak value is the maximum value of the active power output after the actual active power is adjusted through the frequency modulation power;
and substituting the optimal value combination of the proportionality coefficient and the time delay coefficient into the transfer function, and controlling the frequency response of the power electronic equipment through the transfer function determined by the proportionality coefficient and the time delay coefficient.
According to the frequency response control method of the power electronic equipment provided by the invention, the step of determining the value range of the proportionality coefficient comprises the following steps:
and taking the value of the proportionality coefficient when the frequency deviation reaches a maximum frequency difference threshold value as a lower limit value of the proportionality coefficient, and determining the value range of the proportionality coefficient according to the lower limit value of the proportionality coefficient.
According to the frequency response control method of the power electronic device provided by the invention, the value of the proportionality coefficient when the frequency deviation reaches the maximum frequency difference threshold is used as the lower limit value of the proportionality coefficient, and the value range of the proportionality coefficient is determined according to the lower limit value of the proportionality coefficient, which comprises the following steps:
setting the time delay coefficient to be 0, taking the frequency modulation power as a known quantity, and determining a corresponding frequency deviation value when the proportional coefficient takes different values through simulation to obtain a frequency deviation curve;
determining the value of the corresponding proportionality coefficient when the frequency deviation reaches a maximum frequency deviation threshold value from the frequency deviation curve as a lower limit value of the proportionality coefficient;
and taking the value range above the lower limit value of the proportionality coefficient as the value range of the proportionality coefficient.
According to the frequency response control method of the power electronic equipment provided by the invention, the value range of the time delay coefficient corresponding to the value of each proportionality coefficient is determined, and the method comprises the following steps:
respectively acquiring an active power peak value curve and a maximum frequency difference curve corresponding to the value of each proportionality coefficient in the value range of the proportionality coefficient; the active power curve takes the time delay coefficient as an independent variable and takes the active power peak value as a dependent variable, and the maximum frequency difference curve takes the time delay coefficient as an independent variable and takes the maximum frequency deviation as a dependent variable;
taking the value of the time delay coefficient when the active power peak value in the active power peak value curve reaches a preset power maximum threshold value as a lower limit value of the time delay coefficient;
taking the value of the delay coefficient when the maximum frequency deviation in the maximum frequency difference curve reaches a preset maximum frequency difference threshold value as an upper limit value of the delay coefficient;
and obtaining the value range of the time delay coefficient corresponding to the value of each proportionality coefficient according to the lower limit value and the upper limit value of the time delay coefficient corresponding to different proportionality coefficient values in the value range of the proportionality coefficient.
According to the frequency response control method of the power electronic equipment provided by the invention, in the value range of the proportionality coefficient, an active power peak value curve corresponding to the value of each proportionality coefficient is obtained, and the method comprises the following steps:
in the value range of the proportionality coefficient, the proportionality coefficient and the frequency deviation are used as known quantities, and the corresponding output active power value is determined through simulation when the time delay coefficient takes different values, so that a power output curve is obtained; the output active power value is obtained by adjusting the actual active power through the frequency modulation power;
and determining an output active power peak value according to the corresponding power output curve when the time delay coefficient takes different values, obtaining the corresponding output active power peak value when the time delay coefficient takes different values, and obtaining an output active power peak value curve.
According to the frequency response control method of the power electronic equipment provided by the invention, in the value range of the proportionality coefficient, the maximum frequency difference curve corresponding to the value of each proportionality coefficient is obtained, and the method comprises the following steps:
in the value range of the proportionality coefficient, determining a corresponding frequency deviation value when the time delay coefficient takes different values by simulation by taking the proportionality coefficient and the frequency modulation power as known quantities to obtain a frequency deviation curve;
and determining the maximum frequency deviation according to the frequency deviation curve, and obtaining the maximum frequency deviation corresponding to the time delay coefficient with different values to obtain a maximum frequency difference curve.
According to the frequency response control method of the power electronic equipment provided by the invention, the expression of the transfer function is as follows:
wherein, Δ f is frequency deviation, Δ P is frequency modulation power, K is a proportionality coefficient, and T is a time delay coefficient.
According to the frequency response control method of the power electronic equipment provided by the invention, the maximum frequency deviation is an evaluation index of frequency modulation benefit obtained by frequency response control, and the output active power peak value is an evaluation index of frequency modulation cost required by the frequency response control.
In a second aspect, the present invention also provides a frequency response control apparatus for a power electronic device, the apparatus comprising:
the first processing module is used for establishing a transfer function for frequency response control of the power electronic equipment; the transfer function takes frequency deviation as input and frequency modulation power as output, and expresses the relation between the frequency deviation and the frequency modulation power through a proportionality coefficient and a time delay coefficient;
the second processing module is used for respectively determining the value range of the proportionality coefficient and the corresponding value range of the time delay coefficient under the value of each proportionality coefficient to obtain a value set of the proportionality coefficient and the time delay coefficient;
the third processing module is used for determining the optimal value combination of the proportionality coefficient and the time delay coefficient from the value set by taking the minimum maximum frequency deviation and the minimum output active power peak value of the power electronic equipment as targets; the maximum frequency deviation is the maximum value of the frequency deviation after frequency response control is carried out on the transfer function, and the output active power peak value is the maximum value of the active power output after the actual active power is adjusted through the frequency modulation power;
and the fourth processing module is used for substituting the optimal value combination of the proportionality coefficient and the time delay coefficient into the transfer function, and controlling the frequency response of the power electronic equipment through the transfer function determined by the proportionality coefficient and the time delay coefficient.
In a third aspect, the present invention further provides an electronic device, including 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 controlling the frequency response of the power electronic device as described in any one of the above when executing the program.
According to the frequency response control method and device for the power electronic equipment, the transfer function used for frequency response control of the power electronic equipment is established, the optimal value combination of the proportionality coefficient and the time delay coefficient in the transfer function is determined by taking the minimum maximum frequency deviation and the minimum peak value of the output active power of the power electronic equipment as targets, the advantage of flexibility of power output of the power electronic equipment is fully considered, and a better frequency modulation effect can be achieved on the basis that the output active power of the power electronic equipment is lower by utilizing the transfer function, so that the frequency modulation capability of the power electronic equipment is improved.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a frequency response control method of a power electronic device provided by the present invention;
fig. 2 is a peak value curve of output active power obtained under different values of the delay coefficient;
fig. 3 is an accumulated output energy curve of the power electronic device obtained under different values of the time delay coefficient;
FIG. 4 is a maximum frequency difference curve obtained under different values of the delay coefficient;
fig. 5 is a frequency deviation curve obtained in each of the frequency response control method of the power electronic device according to the conventional virtual inertia control method and the improved power electronic device;
fig. 6 is a graph of output active power obtained by a conventional virtual inertia control method and a frequency response control method of an improved power electronic device;
fig. 7 is a graph of cumulative output energy obtained by a frequency response control method of a power electronic device according to a conventional virtual inertia control method and an improved power electronic device, respectively;
fig. 8 is a schematic structural diagram of a frequency response control device of a power electronic apparatus provided by the present invention;
fig. 9 is a schematic structural diagram of an electronic device provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 illustrates a frequency response control method for a power electronic device according to an embodiment of the present invention, where the method includes:
step 110: establishing a transfer function for power electronic device frequency response control; the transfer function takes the frequency deviation as input and takes the frequency modulation power as output, and the relationship between the frequency deviation and the frequency modulation power is expressed by a proportionality coefficient and a time delay coefficient.
In the embodiment, a time delay link is added mainly on the basis of virtual inertia control (i.e., differential control), so that the requirement on the output power of the power electronic equipment is lowered. Power electronics equipment as referred to herein refers to equipment entering the grid through the inverter.
In consideration of simplicity and convenience of a transfer function, the embodiment adopts a first-order inertia link as a time delay link, and realizes frequency response control of the power electronic equipment in a first-order high-pass filtering mode.
The expression of the transfer function constructed in this embodiment is:
wherein, Δ f is frequency deviation and is input of the control strategy, Δ P is frequency modulation power and is output of the control strategy, K is a proportionality coefficient, and T is a time delay coefficient.
Step 120: and respectively determining the value range of the proportionality coefficient and the value range of the corresponding time delay coefficient under the value of each proportionality coefficient to obtain a value set of the proportionality coefficient and the time delay coefficient.
The lower value limit of the proportionality coefficient K is determined mainly based on system frequency constraint, and then the value range of the proportionality coefficient K is determined. Specifically, the process of determining the value range of the proportionality coefficient K includes:
and taking the value of the proportionality coefficient when the frequency deviation delta f reaches the maximum frequency difference threshold value as the lower limit value of the proportionality coefficient, and determining the value range of the proportionality coefficient according to the lower limit value of the proportionality coefficient K.
Specifically, the process of determining the value range of the scaling factor according to the lower limit value of the scaling factor by using the value of the scaling factor when the frequency deviation reaches the maximum frequency difference threshold as the lower limit value of the scaling factor includes:
firstly, setting a time delay coefficient T as 0, wherein the frequency characteristic of the power electronic equipment is the worst at the time, and determining a corresponding frequency deviation value when a proportionality coefficient takes different values through simulation by taking frequency modulation power as a known quantity to obtain a frequency deviation curve.
And then, determining the value of the corresponding proportionality coefficient when the frequency deviation reaches the maximum frequency difference threshold value from the frequency deviation curve, and using the value as the lower limit value of the proportionality coefficient, thereby obtaining the lower limit value of the proportionality coefficient K required by meeting the system frequency deviation constraint.
And finally, taking the value range above the lower limit value of the proportionality coefficient as the value range of the proportionality coefficient.
It is understood that the system frequency constraint mentioned in the present embodiment refers to the maximum frequency deviation Δ fmaxThe parameter is an evaluation index for measuring the frequency modulation benefit, and theoretically, the maximum frequency deviation delta f is considered to bemaxThe smaller the value of (c), the greater the frequency modulation benefit.
After the value range of the proportionality coefficient K is determined, it is necessary to further determine the value range of the corresponding delay coefficient under the value of each proportionality coefficient, and the process specifically includes:
firstly, respectively acquiring an active power peak value curve and a maximum frequency difference curve corresponding to the value of each proportionality coefficient in the value range of the proportionality coefficients; the active power curve takes the time delay coefficient as an independent variable, takes the active power peak value as a dependent variable, and the maximum frequency difference curve takes the time delay coefficient as an independent variable and takes the maximum frequency deviation as a dependent variable.
And then, taking the value of the time delay coefficient when the active power peak value in the active power peak value curve reaches a preset power maximum threshold value as a lower limit value of the time delay coefficient.
And then, taking the value of the delay coefficient when the maximum frequency deviation in the maximum frequency difference curve reaches a preset maximum frequency difference threshold value as the upper limit value of the delay coefficient.
And finally, obtaining the value range of the corresponding time delay coefficient under the value of each proportionality coefficient according to the lower limit value and the upper limit value of the time delay coefficient corresponding to different proportionality coefficient values in the value range of the proportionality coefficient.
That is to say, under the condition that the value of the proportionality coefficient K is determined, different values of T are simulated, an active power peak value curve and a maximum frequency difference curve of the power electronic device can be obtained, and then the value range of the corresponding delay coefficient T under the current value of K is determined, so that value combinations of the proportionality coefficient K and the delay coefficient T in multiple sets of feasible regions are obtained.
Specifically, in the value range of the proportionality coefficient K, an active power peak value curve corresponding to the value of each proportionality coefficient is obtained, and the process includes:
firstly, in the value range of a proportionality coefficient K, the proportionality coefficient and frequency deviation are used as known quantities, and the corresponding output active power value is determined through simulation when the time delay coefficient takes different values, so that a power output curve is obtained; the output active power value is obtained by adjusting the actual active power through the frequency modulation power, that is, the frequency modulation power Δ P is regarded as the deviation amount of the actual active power, and the output active power P is obtained through adjustment.
And then, determining an output active power peak value according to a power output curve corresponding to the time delay coefficient with different values, and obtaining an output active power peak value corresponding to the time delay coefficient with different values to obtain an output active power peak value curve.
It will be appreciated that the peak output active power is the maximum output active power in the power output curve, i.e. PmaxIn this embodiment, the output active power peak curve is shown in fig. 2, and it can be seen from fig. 2 that as the delay coefficient T increases, the output active power peak P is outputmaxGradually decreases. Accordingly, referring to fig. 3, the cumulative output energy E of the power electronics device also gradually decreases as the delay factor T increases. Since the peak output active power can be used to evaluate the frequency modulation cost of the frequency response control strategy provided in this embodiment, in this case, the frequency modulation cost decreases as the delay coefficient T increases.
Specifically, in the range of the scaling factor, obtaining a maximum frequency difference curve corresponding to the value of each scaling factor includes:
firstly, in the value range of the proportionality coefficient, the proportionality coefficient and the frequency modulation power are used as known quantities, and the frequency deviation value corresponding to the time delay coefficient with different values is determined through simulation, so that a frequency deviation curve is obtained.
And then, determining the maximum frequency deviation according to the frequency deviation curve, and obtaining the maximum frequency deviation corresponding to the time delay coefficient with different values to obtain a maximum frequency deviation curve.
It will be understood that the maximum frequency deviation refers to the highest value of the frequency deviation in the frequency deviation curve, i.e. Δ fmax. The maximum frequency difference curve in this embodiment is shown in fig. 4, and it can be seen from fig. 4 that the maximum frequency deviation Δ f increases with the increase of the delay coefficient TmaxIncreasing first and then decreasing. Due to the maximum frequency deviation Δ fmaxThe method can be used for evaluating the frequency modulation effect of the frequency response control strategy provided by the embodiment, and in this way, the frequency modulation effect gradually becomes worse and better along with the increase of the delay coefficient T.
Step 130: the method comprises the steps that the maximum frequency deviation of the power electronic equipment is minimum, the peak value of output active power is minimum, and the optimal value combination of a proportionality coefficient and a time delay coefficient is determined from a value set; the maximum frequency deviation is the maximum value of the frequency deviation after the frequency response control is carried out through the transfer function, and the output active power peak value is the maximum value of the active power output after the actual active power is adjusted through the frequency modulation power.
The maximum frequency deviation is an evaluation index of the frequency modulation benefit obtained by the frequency response control, and the output active power peak is an evaluation index of the frequency modulation cost required by the frequency response control.
Because the maximum frequency deviation can be used for evaluating the frequency modulation benefit (namely the frequency modulation effect), the output active power peak value can be used for evaluating the frequency modulation cost, the smaller the maximum frequency deviation is, the better the frequency modulation effect is, the smaller the output active power peak value is, and the lower the frequency modulation cost is. The optimization objective of this embodiment is to consider both the frequency modulation benefit and the frequency modulation cost, and find a value combination of the corresponding scaling factor and the delay factor under the condition that the frequency modulation benefit is as large as possible and the frequency modulation cost is as low as possible, where the value combination is an optimal value combination of the scaling factor and the delay factor to be obtained in this embodiment.
Step 140: and substituting the optimal value combination of the proportionality coefficient and the time delay coefficient into the transfer function, and controlling the frequency response of the power electronic equipment through the transfer function determined by the proportionality coefficient and the time delay coefficient.
Through the transfer function determined in the above way, a more ideal frequency modulation effect can be obtained under the condition of ensuring that the output active power is as small as possible.
To illustrate more clearly, compared with the existing virtual inertia control method, the frequency response control method for the power electronic device provided by the embodiment can obtain a more ideal frequency modulation effect under the condition that the output active power is ensured to be as small as possible. In this embodiment, the frequency deviation curve, the output active power curve and the accumulated output energy curve obtained by the existing virtual inertia control method and the improved frequency response control method of the power electronic device are compared, and refer to fig. 5, fig. 6 and fig. 7 specifically.
Referring to fig. 5, where a curve a represents a frequency deviation curve under the frequency response control method of the electronic device according to the present embodiment, and a curve b represents a frequency deviation curve under the virtual inertia control method, it can be seen from the curves a and b that the maximum frequency deviation is improved under the frequency response control method implemented by the first-order high-pass filtering according to the present embodiment.
Referring to fig. 6, a curve c represents an output active power curve under the frequency response control method implemented by using the first-order high-pass filtering provided in this embodiment, and a curve d represents an output active power curve under the virtual inertia control method.
Referring to fig. 7, where a curve m represents an accumulated output energy curve in the frequency response control method implemented by using the first-order high-pass filtering provided in the present embodiment, and a curve n represents an accumulated output energy curve in the virtual inertia control method, it can be seen from the curves m and n that the accumulated output energy is relatively low in the frequency response control method implemented by using the first-order high-pass filtering provided in the present embodiment.
As can be seen from fig. 5, 6 and 7, the frequency response control method implemented by using the first-order high-pass filtering according to this embodiment improves the maximum frequency difference of the system without increasing power and energy output, and can obtain a better frequency modulation effect compared with virtual inertia control, thereby fully playing the frequency modulation capability of the power electronic device and further effectively improving the frequency modulation effect of the power system.
The following describes a frequency response control device of a power electronic device provided by the present invention, and the frequency response control device of the power electronic device described below and the frequency response control method of the power electronic device described above may be referred to in correspondence with each other.
Fig. 8 shows a frequency response control apparatus for a power electronic device according to an embodiment of the present invention, the apparatus including:
a first processing module 810 for establishing a transfer function for power electronics frequency response control; the transfer function takes the frequency deviation as input and takes the frequency modulation power as output, and the relationship between the frequency deviation and the frequency modulation power is expressed by a proportionality coefficient and a time delay coefficient;
a second processing module 820, configured to determine a value range of the scaling factor and a value range of the delay factor corresponding to the value of each scaling factor, respectively, to obtain a value set of the scaling factor and the delay factor;
the third processing module 830 is configured to determine an optimal value combination of a scaling coefficient and a delay coefficient from a set of values by taking that the maximum frequency deviation of the power electronic device is minimum and the output active power peak value is minimum; the maximum frequency deviation is the maximum value of the frequency deviation after frequency response control is carried out through a transfer function, and the output active power peak value is the maximum value of the active power output after the actual active power is adjusted through frequency modulation power;
and the fourth processing module 840 is configured to substitute the optimal value combination of the scaling factor and the delay factor into the transfer function, and control the frequency response of the power electronic device according to the transfer function determined by the scaling factor and the delay factor.
Specifically, the second processing module 820 in this embodiment includes:
and the first value taking unit is used for taking the value of the proportionality coefficient when the frequency deviation reaches the maximum frequency difference threshold value as the lower limit value of the proportionality coefficient, and determining the value range of the proportionality coefficient according to the lower limit value of the proportionality coefficient.
Further, the first value taking unit specifically includes:
the first value-taking subunit is used for setting the time delay coefficient to be 0, taking the frequency modulation power as a known quantity, and determining a corresponding frequency deviation value when the proportionality coefficient takes different values through simulation to obtain a frequency deviation curve;
the second value-taking subunit is used for determining the value of the corresponding proportionality coefficient when the frequency deviation reaches the maximum frequency difference threshold value from the frequency deviation curve, and taking the value as the lower limit value of the proportionality coefficient;
and the third value-taking subunit is used for taking the value-taking range above the lower limit value of the proportionality coefficient as the value-taking range of the proportionality coefficient.
The second processing module 820 in this embodiment further includes:
the first obtaining unit is used for respectively obtaining an active power peak value curve and a maximum frequency difference curve corresponding to the value of each proportionality coefficient within the value range of the proportionality coefficient; the active power curve takes a time delay coefficient as an independent variable, takes an active power peak value as a dependent variable, and the maximum frequency difference curve takes the time delay coefficient as the independent variable and takes the maximum frequency deviation as the dependent variable;
the second obtaining unit is used for taking the value of the time delay coefficient when the active power peak value in the active power peak value curve reaches a preset power maximum threshold value as a lower limit value of the time delay coefficient;
a third obtaining unit, configured to take a value of the delay coefficient when the maximum frequency deviation in the maximum frequency difference curve reaches a preset maximum frequency difference threshold as an upper limit of the delay coefficient;
and the second value taking unit is used for obtaining the value range of the corresponding time delay coefficient under the value of each proportionality coefficient according to the lower limit value and the upper limit value of the time delay coefficient corresponding to different proportionality coefficient values in the value range of the proportionality coefficient.
Further, the first obtaining unit specifically includes:
the first obtaining subunit is used for determining, in a value range of the proportionality coefficient, a corresponding output active power value when the time delay coefficient takes different values through simulation by taking the proportionality coefficient and the frequency deviation as known quantities to obtain a power output curve; the output active power value is obtained by adjusting the actual active power through the frequency modulation power;
and the second obtaining subunit is configured to determine an output active power peak value according to a power output curve corresponding to the time delay coefficient when the time delay coefficient takes different values, obtain an output active power peak value corresponding to the time delay coefficient when the time delay coefficient takes different values, and obtain an output active power peak value curve.
Further, the first obtaining unit further includes:
the third acquisition subunit is used for determining a corresponding frequency deviation value when the time delay coefficient takes different values through simulation by taking the proportionality coefficient and the frequency modulation power as known quantities within the value range of the proportionality coefficient to obtain a frequency deviation curve;
and the fourth obtaining subunit is configured to determine a maximum frequency deviation according to the frequency deviation curve, obtain a maximum frequency deviation corresponding to the time delay coefficient with different values, and obtain a maximum frequency deviation curve.
Fig. 9 illustrates a physical structure diagram of an electronic device, and as shown in fig. 9, the electronic device may include: a processor (processor)910, a communication Interface (Communications Interface)920, a memory (memory)930, and a communication bus 940, wherein the processor 910, the communication Interface 920, and the memory 930 communicate with each other via the communication bus 940. Processor 910 may invoke logic instructions in memory 930 to perform a method of frequency response control of a power electronic device, the method comprising: establishing a transfer function for power electronic device frequency response control; the transfer function takes the frequency deviation as input and takes the frequency modulation power as output, and the relationship between the frequency deviation and the frequency modulation power is expressed by a proportionality coefficient and a time delay coefficient; respectively determining the value range of the proportionality coefficient and the value range of the corresponding time delay coefficient under the value of each proportionality coefficient to obtain a value set of the proportionality coefficient and the time delay coefficient; the method comprises the steps that the maximum frequency deviation of the power electronic equipment is minimum, the peak value of output active power is minimum, and the optimal value combination of a proportionality coefficient and a time delay coefficient is determined from a value set; the maximum frequency deviation is the maximum value of the frequency deviation after frequency response control is carried out through a transfer function, and the output active power peak value is the maximum value of the active power output after the actual active power is adjusted through frequency modulation power; and substituting the optimal value combination of the proportionality coefficient and the time delay coefficient into the transfer function, and controlling the frequency response of the power electronic equipment through the transfer function determined by the proportionality coefficient and the time delay coefficient.
Furthermore, the logic instructions in the memory 930 may be implemented in software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product comprising a computer program, the computer program being storable on a non-transitory computer-readable storage medium, the computer program, when executed by a processor, being capable of executing the method for controlling frequency response of a power electronic device provided by the above methods, the method comprising: establishing a transfer function for power electronic device frequency response control; the transfer function takes the frequency deviation as input and takes the frequency modulation power as output, and the relationship between the frequency deviation and the frequency modulation power is expressed by a proportionality coefficient and a time delay coefficient; respectively determining the value range of the proportionality coefficient and the value range of the corresponding time delay coefficient under the value of each proportionality coefficient to obtain a value set of the proportionality coefficient and the time delay coefficient; the method comprises the steps that the maximum frequency deviation of the power electronic equipment is minimum, the peak value of output active power is minimum, and the optimal value combination of a proportionality coefficient and a time delay coefficient is determined from a value set; the maximum frequency deviation is the maximum value of the frequency deviation after frequency response control is carried out through a transfer function, and the output active power peak value is the maximum value of the active power output after the actual active power is adjusted through frequency modulation power; and substituting the optimal value combination of the proportionality coefficient and the time delay coefficient into the transfer function, and controlling the frequency response of the power electronic equipment through the transfer function determined by the proportionality coefficient and the time delay coefficient.
In yet another aspect, the present invention also provides a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method of frequency response control of a power electronic device provided by performing the above methods, the method comprising: establishing a transfer function for power electronic device frequency response control; the transfer function takes the frequency deviation as input and takes the frequency modulation power as output, and the relationship between the frequency deviation and the frequency modulation power is expressed by a proportionality coefficient and a time delay coefficient; respectively determining the value range of the proportionality coefficient and the value range of the corresponding time delay coefficient under the value of each proportionality coefficient to obtain a value set of the proportionality coefficient and the time delay coefficient; the method comprises the steps that the maximum frequency deviation of the power electronic equipment is minimum, the peak value of output active power is minimum, and the optimal value combination of a proportionality coefficient and a time delay coefficient is determined from a value set; the maximum frequency deviation is the maximum value of the frequency deviation after frequency response control is carried out through a transfer function, and the output active power peak value is the maximum value of the active power output after the actual active power is adjusted through frequency modulation power; and substituting the optimal value combination of the proportionality coefficient and the time delay coefficient into the transfer function, and controlling the frequency response of the power electronic equipment through the transfer function determined by the proportionality coefficient and the time delay coefficient.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A frequency response control method of a power electronic device, comprising:
establishing a transfer function for power electronic device frequency response control; the transfer function takes frequency deviation as input and frequency modulation power as output, and expresses the relation between the frequency deviation and the frequency modulation power through a proportionality coefficient and a time delay coefficient;
respectively determining the value range of the proportionality coefficient and the corresponding value range of the time delay coefficient under the value of each proportionality coefficient to obtain a value set of the proportionality coefficient and the time delay coefficient;
determining the optimal value combination of the proportionality coefficient and the time delay coefficient from the value set by taking the minimum maximum frequency deviation and the minimum output active power peak value of the power electronic equipment as targets; the maximum frequency deviation is the maximum value of the frequency deviation after frequency response control is carried out on the transfer function, and the output active power peak value is the maximum value of the active power output after the actual active power is adjusted through the frequency modulation power;
and substituting the optimal value combination of the proportionality coefficient and the time delay coefficient into the transfer function, and controlling the frequency response of the power electronic equipment through the transfer function determined by the proportionality coefficient and the time delay coefficient.
2. The method according to claim 1, wherein determining the value range of the scaling factor comprises:
and taking the value of the proportionality coefficient when the frequency deviation reaches a maximum frequency difference threshold value as a lower limit value of the proportionality coefficient, and determining the value range of the proportionality coefficient according to the lower limit value of the proportionality coefficient.
3. The method according to claim 2, wherein the step of determining the value range of the scaling factor according to the lower limit value of the scaling factor by using the value of the scaling factor when the frequency deviation reaches the maximum frequency difference threshold as the lower limit value of the scaling factor comprises:
setting the time delay coefficient to be 0, taking the frequency modulation power as a known quantity, and determining a corresponding frequency deviation value when the proportional coefficient takes different values through simulation to obtain a frequency deviation curve;
determining the value of the corresponding proportionality coefficient when the frequency deviation reaches a maximum frequency deviation threshold value from the frequency deviation curve as a lower limit value of the proportionality coefficient;
and taking the value range above the lower limit value of the proportionality coefficient as the value range of the proportionality coefficient.
4. The method according to claim 1, wherein determining a value range of the delay coefficient corresponding to a value of each scaling coefficient includes:
respectively acquiring an active power peak value curve and a maximum frequency difference curve corresponding to the value of each proportionality coefficient in the value range of the proportionality coefficient; the active power curve takes the time delay coefficient as an independent variable and takes the active power peak value as a dependent variable, and the maximum frequency difference curve takes the time delay coefficient as an independent variable and takes the maximum frequency deviation as a dependent variable;
taking the value of the time delay coefficient when the active power peak value in the active power peak value curve reaches a preset power maximum threshold value as a lower limit value of the time delay coefficient;
taking the value of the delay coefficient when the maximum frequency deviation in the maximum frequency difference curve reaches a preset maximum frequency difference threshold value as an upper limit value of the delay coefficient;
and obtaining the value range of the time delay coefficient corresponding to the value of each proportionality coefficient according to the lower limit value and the upper limit value of the time delay coefficient corresponding to different proportionality coefficient values in the value range of the proportionality coefficient.
5. The method according to claim 4, wherein obtaining an active power peak curve corresponding to a value of each scaling coefficient within a value range of the scaling coefficient includes:
in the value range of the proportionality coefficient, the proportionality coefficient and the frequency deviation are used as known quantities, and the corresponding output active power value is determined through simulation when the time delay coefficient takes different values, so that a power output curve is obtained; the output active power value is obtained by adjusting the actual active power through the frequency modulation power;
and determining an output active power peak value according to the corresponding power output curve when the time delay coefficient takes different values, obtaining the corresponding output active power peak value when the time delay coefficient takes different values, and obtaining an output active power peak value curve.
6. The method according to claim 4, wherein obtaining a maximum frequency difference curve corresponding to a value of each scaling coefficient within a value range of the scaling coefficient includes:
in the value range of the proportionality coefficient, determining a corresponding frequency deviation value when the time delay coefficient takes different values by simulation by taking the proportionality coefficient and the frequency modulation power as known quantities to obtain a frequency deviation curve;
and determining the maximum frequency deviation according to the frequency deviation curve, and obtaining the maximum frequency deviation corresponding to the time delay coefficient with different values to obtain a maximum frequency difference curve.
7. The method of claim 1, wherein the transfer function is expressed as:
wherein, Δ f is frequency deviation, Δ P is frequency modulation power, K is a proportionality coefficient, and T is a time delay coefficient.
8. The method according to claim 1, wherein the maximum frequency deviation is an evaluation index of a frequency modulation benefit obtained by the frequency response control, and the output active power peak value is an evaluation index of a frequency modulation cost required by the frequency response control.
9. A frequency response control apparatus of a power electronic device, comprising:
the first processing module is used for establishing a transfer function for frequency response control of the power electronic equipment; the transfer function takes frequency deviation as input and frequency modulation power as output, and expresses the relation between the frequency deviation and the frequency modulation power through a proportionality coefficient and a time delay coefficient;
the second processing module is used for respectively determining the value range of the proportionality coefficient and the corresponding value range of the time delay coefficient under the value of each proportionality coefficient to obtain a value set of the proportionality coefficient and the time delay coefficient;
the third processing module is used for determining the optimal value combination of the proportionality coefficient and the time delay coefficient from the value set by taking the minimum maximum frequency deviation and the minimum output active power peak value of the power electronic equipment as targets; the maximum frequency deviation is the maximum value of the frequency deviation after frequency response control is carried out on the transfer function, and the output active power peak value is the maximum value of the active power output after the actual active power is adjusted through the frequency modulation power;
and the fourth processing module is used for substituting the optimal value combination of the proportionality coefficient and the time delay coefficient into the transfer function, and controlling the frequency response of the power electronic equipment through the transfer function determined by the proportionality coefficient and the time delay coefficient.
10. An electronic device comprising a memory, a processor and a computer program stored on said memory and executable on said processor, characterized in that said processor, when executing said program, carries out the steps of a method for frequency response control of a power electronic device according to any one of claims 1 to 8.
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| CN117293860B (en) * | 2023-09-28 | 2024-04-23 | 暨南大学 | Frequency safety index evaluation method, system and storage medium of power system |
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