CN116613772A - Active frequency support control method for energy storage power station - Google Patents
Active frequency support control method for energy storage power station Download PDFInfo
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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Abstract
The application discloses an active frequency support control method of an energy storage power station, which comprises the following steps: firstly, detecting the frequency of a grid-connected point of an energy storage power station, and judging whether the frequency exceeds a frequency modulation dead zone of the energy storage power station; calculating an active output command value of the energy storage power station according to the frequency variation of the grid connection point; judging whether the frequency of the grid-connected point exceeds the lowest frequency point or the highest frequency point; and correcting and calculating an active output instruction value of the energy storage power station, and judging whether the frequency of the grid-connected point exceeds a maximum frequency support threshold value. According to the method, firstly, the active variable quantity of the energy storage power station participating in frequency modulation is determined according to the variable quantity of the frequency of the grid-connected point, the first section of frequency modulation coefficient is determined, the second section of frequency modulation coefficient is determined, and the active variable quantity of the energy storage power station participating in frequency modulation is corrected, so that the energy storage power station provides more active output, the frequency of the system is controlled to be in a maximum frequency supporting section, and the steady-state frequency deviation of the system is reduced.
Description
Technical Field
The application belongs to the technical field of power grid frequency modulation, and particularly relates to an active frequency support control method of an energy storage power station.
Background
New energy sources represented by wind power and photovoltaic are becoming installation bodies and electric power supply bodies. However, large-scale access of new energy brings serious challenges to safe and stable operation of the power grid. Firstly, the randomness and fluctuation of wind power and photovoltaic output are extremely easy to generate the problem of power fluctuation, and the balance between the source load and the load of the system is influenced; and secondly, the equivalent inertia and frequency adjustment resources of the power system are reduced, the capacity of resisting frequency disturbance is weakened, serious frequency fluctuation can occur when the load changes, and the frequency stability of the region is jeopardized. Therefore, the frequency support control method for researching the system under the new energy grid connection has important theoretical and application values for guaranteeing the safe and stable operation of the power system.
Currently, the energy storage power station participates in the power grid frequency support and adjusts the active output of the energy storage power station mainly through virtual inertia, sagging control and other methods. However, the traditional virtual inertia and sagging control cannot fully exert the frequency modulation capability of the energy storage power station, and especially under the condition of high-proportion new energy grid connection, the frequency modulation resources of the system are less, so that the frequency stabilization of the system is not facilitated.
Disclosure of Invention
Aiming at the defects of the prior art, the application aims to provide an active frequency support control method of an energy storage power station so as to solve the problems in the background art.
The aim of the application can be achieved by the following technical scheme:
an active frequency support control method of an energy storage power station comprises the following steps:
step 1, firstly detecting the frequency of a grid-connected point of an energy storage power station, comparing the frequency of the grid-connected point with a frequency modulation dead zone of the energy storage power station, judging whether the frequency modulation dead zone of the energy storage power station is exceeded, entering step 2 if the frequency modulation dead zone of the energy storage power station is exceeded, and continuously detecting the frequency if the frequency modulation dead zone of the energy storage power station is not exceeded;
step 2, calculating an active output instruction value of the energy storage power station according to the frequency variation of the grid-connected point, judging whether the upper limit and the lower limit of the active output of the energy storage power station are exceeded, if yes, participating in frequency adjustment according to the upper limit and the lower limit of the active output of the energy storage power station, and if not, transmitting the calculated active output instruction value to the energy storage power station for execution;
step 3, judging whether the frequency of the grid-connected point exceeds the lowest frequency point or the highest frequency point, returning to the step 2 if the frequency does not exceed the lowest frequency point or the highest frequency point, and collecting the lowest frequency point or the highest frequency point if the frequency exceeds the lowest frequency point or the highest frequency point;
and 4, correcting and calculating an active output command value of the energy storage power station, judging whether the frequency of the grid-connected point exceeds a maximum frequency support threshold, returning to the step 1 if the frequency exceeds the maximum frequency support threshold, and continuously executing the corrected active output command value if the frequency exceeds the maximum frequency support threshold.
Preferably, in the step 2, when f is less than or equal to f ld When the energy storage power station needs to increase active power, the expression of the increased active power is as follows:
ΔP l ＝-k l1 (f-f ld )
wherein DeltaP l For the active power increment, k of the energy storage power station when the frequency of the grid-connected point drops l1 Is the first section frequency modulation proportionality coefficient when the frequency is low, f is the frequency of a grid-connected point, f ld The energy storage power station frequency modulation dead zone lower limit value;
when f is greater than or equal to f hd When the energy storage power station needs to reduce the active power, the expression of the active power of the energy storage power station is as follows:
ΔP h ＝-k h1 (f-f hd )
wherein DeltaP h Active power reduction, k of energy storage power station when grid-connected point frequency rises h1 Is the first section frequency modulation proportionality coefficient at high frequency, f hd Frequency modulation dead for energy storage power stationZone upper limit.
Preferably, said k l1 The calculated expression of (2) is as follows:
wherein P is max For the maximum value of the active output of the energy storage power station, P ref0 For the initial value of the active output command of the energy storage power station, f min The minimum operating frequency allowed for the grid;
the k is h1 The calculated expression of (2) is as follows:
wherein P is min Is the minimum value of the active output of the energy storage power station, f max For the maximum operating frequency allowed by the grid.
Preferably, the calculation expression of the energy storage power station active output instruction value is as follows:
when f is less than or equal to f ld When (1):
P ref ＝P ref0 +ΔP l
when f is greater than or equal to f hd When (1):
P ref ＝P ref0 +ΔP h
wherein P is ref The power output command value is an active output command value of the energy storage power station.
Preferably, when said Δp l If P when the frequency of the grid connection point drops ref If the energy storage power station active output maximum value is larger than the energy storage power station active output maximum value, the energy storage power station active output maximum value participates in frequency adjustment, otherwise P is added ref Issuing to an energy storage power station for execution;
when DeltaP l If P when the frequency of the grid-connected point rises ref If the power output is smaller than the minimum value of the active output of the energy storage power station, the power station participates in frequency adjustment according to the minimum value of the active output, otherwise P is added ref And issuing the power to an energy storage power station for execution.
Preferably, in the step 3, when f is less than or equal to f ld If the frequency of the grid connection point is not reachedIf the frequency reaches the lowest point, continuously increasing the active power according to the method in the step 2, otherwise, acquiring the frequency of the grid-connected point of the lowest point, and entering a frequency supporting process of the second section;
when f is greater than or equal to f hd And (2) if the grid-connected point frequency does not reach the highest frequency point, continuing to reduce the active power according to the method in the step (2), otherwise, acquiring the grid-connected point frequency of the highest point, and entering a frequency supporting process of the second section.
Preferably, the correction calculation formula of the active output command value of the energy storage power station in the step 4 is as follows:
when f is less than or equal to f ld When (1):
ΔP l ′＝-k l2 (f lmin -f)
wherein DeltaP' l Correction value k for active increment of energy storage power station l2 Is the second-stage frequency modulation proportionality coefficient at low frequency, f lmin Is the lowest point frequency;
when f is greater than or equal to f hd When (1):
ΔP h ′＝-k h2 (f hmax -f)
wherein DeltaP' h Correction value k for active reduction amount of energy storage power station h2 Is the second-stage frequency modulation proportionality coefficient at high frequency, f hmax Is the highest point frequency.
Preferably, said k l2 The calculated expression of (2) is as follows:
wherein f l A lower limit value that is a maximum frequency support threshold;
the k is h2 The calculated expression of (2) is as follows:
wherein f h The upper limit value of the threshold is supported for the maximum frequency.
Preferably, in the step 4, at low frequency, the grid-connected point frequency is compared with the lower limit value of the maximum frequency support threshold, if the grid-connected point frequency is greater than the lower limit value of the maximum frequency support threshold, the step 1 is returned, otherwise, a corrected active output command value is calculated, and then the step 2 is repeated, wherein the expression of the corrected active output command value is as follows:
P ref ＝P ref0 +ΔP l ′
preferably, in the step 4, at high frequency, the grid-connected point frequency is compared with the upper limit value of the maximum frequency support threshold, if the grid-connected point frequency is smaller than the lower limit value of the maximum frequency support threshold, the step 1 is returned, otherwise, the corrected active output command value is calculated, and then the step 2 is repeated, wherein the expression of the corrected active output command value is as follows:
P ref ＝P ref0 +ΔP h ′
the application has the beneficial effects that:
1. the method can improve the supporting strength of the energy storage power station to the power grid frequency, ensure the frequency stability of the power grid, firstly determine the active variable quantity of the energy storage power station participating in frequency modulation according to the frequency variable quantity of the grid-connected point, determine the first section of frequency modulation coefficient according to the criterion of fully exerting the frequency modulation capability of the energy storage power station before exceeding the allowable operating frequency of the power grid, then determine the second section of frequency modulation coefficient according to the criterion of maximizing the supporting frequency when the frequency exceeds the lowest frequency point or the highest frequency point, correct the active variable quantity of the energy storage power station participating in frequency modulation, enable the energy storage power station to provide more active output, control the frequency of the system in the maximum frequency supporting interval and reduce the steady-state frequency deviation of the system.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to those skilled in the art that other drawings can be obtained according to these drawings without inventive effort.
FIG. 1 is a flow chart of a method of an embodiment of the present application;
FIG. 2 is a schematic diagram of frequency support control in an embodiment of the application;
FIG. 3 is a graph of the adjustment of the frequency drop in an embodiment of the application;
fig. 4 is a graph of the adjustment curve as the frequency rises in an embodiment of the application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Referring to fig. 1, the present embodiment provides an active frequency support control method for an energy storage power station, where f ld ＝49.95Hz，f hd ＝50.05Hz，f min ＝49.8Hz，f max ＝50.2Hz，f l ＝49.967Hz，f h = 50.033Hz, comprising in particular the following steps:
step 1, firstly detecting the frequency of a grid-connected point of an energy storage power station, comparing the frequency of the grid-connected point with a frequency modulation dead zone of the energy storage power station, judging whether the frequency modulation dead zone of the energy storage power station is exceeded, entering step 2 if the frequency modulation dead zone of the energy storage power station is exceeded, and continuously detecting the frequency if the frequency modulation dead zone of the energy storage power station is not exceeded;
step 2, calculating an active output instruction value of the energy storage power station according to the frequency variation of the grid-connected point, judging whether the upper limit and the lower limit of the active output of the energy storage power station are exceeded, if yes, participating in frequency adjustment according to the upper limit and the lower limit of the active output of the energy storage power station, and if not, transmitting the calculated active output instruction value to the energy storage power station for execution;
wherein when f is less than or equal to f ld When the energy storage power station needs to increase active power, the expression of the increased active power is as follows:
ΔP l ＝-k l1 (f-f ld )
wherein DeltaP l For the active power of the energy storage power station when the frequency of the grid-connected point dropsPower increment, k l1 Is the first section frequency modulation proportionality coefficient when the frequency is low, f is the frequency of a grid-connected point, f ld The energy storage power station frequency modulation dead zone lower limit value;
k l1 the calculated expression of (2) is as follows:
wherein P is max For the maximum value of the active output of the energy storage power station, P ref0 For the initial value of the active output command of the energy storage power station, f min The minimum operating frequency allowed for the grid;
when f is greater than or equal to f hd When the energy storage power station needs to reduce the active power, the expression of the active power of the energy storage power station is as follows:
ΔP h ＝-k h1 (f-f hd )
wherein DeltaP h Active power reduction, k of energy storage power station when grid-connected point frequency rises h1 Is the first section frequency modulation proportionality coefficient at high frequency, f hd The energy storage power station frequency modulation dead zone upper limit value;
k h1 the calculated expression of (2) is as follows:
wherein P is min Is the minimum value of the active output of the energy storage power station, f max Maximum operating frequency allowed for the grid;
the calculation expression of the energy storage power station active output instruction value is as follows:
when f is less than or equal to f ld When (1):
P ref ＝P ref0 +ΔP l
when f is greater than or equal to f hd When (1):
P ref ＝P ref0 +ΔP h
wherein P is ref An active output command value of the energy storage power station;
when the frequency of the grid connection point drops, if P ref If the energy storage power station active output maximum value is larger than the energy storage power station active output maximum value, the energy storage power station active output maximum value participates in frequency adjustment, otherwise P is added ref Issuing to an energy storage power station for execution;
when the frequency of the grid connection point rises, if P ref If the power output is smaller than the minimum value of the active output of the energy storage power station, the power station participates in frequency adjustment according to the minimum value of the active output, otherwise P is added ref And issuing the power to an energy storage power station for execution.
Step 3, judging whether the frequency of the grid-connected point exceeds the lowest frequency point or the highest frequency point, returning to the step 2 if the frequency does not exceed the lowest frequency point or the highest frequency point, and collecting the lowest frequency point or the highest frequency point if the frequency exceeds the lowest frequency point or the highest frequency point;
when f is less than or equal to f ld If the grid-connected point frequency does not reach the lowest frequency point, continuously increasing active power according to the method in the step 2, otherwise, acquiring the grid-connected point frequency of the lowest point, and entering a frequency supporting process of the second section;
when f is greater than or equal to f hd And (2) if the grid-connected point frequency does not reach the highest frequency point, continuing to reduce the active power according to the method in the step (2), otherwise, acquiring the grid-connected point frequency of the highest point, and entering a frequency supporting process of the second section.
And 4, correcting and calculating an active output command value of the energy storage power station, judging whether the frequency of the grid-connected point exceeds a maximum frequency support threshold, returning to the step 1 if the frequency exceeds the maximum frequency support threshold, and continuously executing the corrected active output command value if the frequency exceeds the maximum frequency support threshold.
The correction calculation formula of the active output command value of the energy storage power station is as follows:
when f is less than or equal to f ld When (1):
ΔP l ′＝-k l2 (f lmin -f)
wherein DeltaP' l Correction value k for active increment of energy storage power station l2 Is the second-stage frequency modulation proportionality coefficient at low frequency, f lmin Is the lowest point frequency;
k l2 the calculated expression of (2) is as follows:
wherein f l A lower limit value that is a maximum frequency support threshold;
when f is greater than or equal to f hd When (1):
ΔP h ′＝-k h2 (f hmax -f)
wherein DeltaP' h Correction value k for active reduction amount of energy storage power station h2 Is the second-stage frequency modulation proportionality coefficient at high frequency, f hmax Is the highest point frequency;
k h2 the calculated expression of (2) is as follows:
wherein f h The upper limit value of the threshold is supported for the maximum frequency.
And (3) when the step (4) is at low frequency, comparing the grid-connected point frequency with the lower limit value of the maximum frequency support threshold, returning to the step (1) if the grid-connected point frequency is greater than the lower limit value of the maximum frequency support threshold, otherwise, calculating a corrected active output command value, and then repeating the step (2), wherein the expression of the corrected active output command value is as follows:
P ref ＝P ref0 +ΔP l ′
and (3) comparing the grid-connected point frequency with the upper limit value of the maximum frequency support threshold value at high frequency, returning to the step (1) if the grid-connected point frequency is smaller than the lower limit value of the maximum frequency support threshold value, otherwise, calculating a corrected active output command value, and repeating the step (2), wherein the expression of the corrected active output command value is as follows:
P ref ＝P ref0 +ΔP h ′
the load was set to be suddenly changed at 1s, with a sudden increase of 0.5p.u. and a sudden decrease of 0.4p.u., respectively. The inventive method and the conventional sag control frequency comparison curves shown in fig. 3 and 4 have the sag control frequency modulation scaling factor set to be consistent with the first-stage frequency modulation scaling factor of the application. The method provided by the application can be used for excavating the frequency modulation capability of the energy storage power station and reducing the steady-state frequency deviation of the system.
In summary, the frequency support control method for the energy storage power station provided by the application can improve the support force of the energy storage power station on the frequency of the power grid and ensure the frequency stability of the power grid. The concrete steps are as follows: the method comprises the steps of providing a segmented maximum dynamics frequency support strategy, firstly determining the active variable quantity of the energy storage power station participating in frequency modulation according to the frequency variable quantity of the grid-connected point, and determining a first segment of frequency modulation coefficient according to the criterion of fully exerting the frequency modulation capability of the energy storage power station before exceeding the allowable operating frequency of a power grid. And when the frequency exceeds the lowest frequency point or the highest frequency point, determining a second section of frequency modulation coefficient according to the criterion of maximizing the supporting frequency, and correcting the active variable quantity of the energy storage power station participating in frequency modulation, so that the energy storage power station provides more active output force, the frequency of the system is controlled in the maximum frequency supporting interval, and the steady-state frequency deviation of the system is reduced.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present application and not for limiting the same, and although the present application has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the application without departing from the spirit and scope of the application, which is intended to be covered by the claims.
Claims (10)
1. The active frequency support control method of the energy storage power station is characterized by comprising the following steps of:
step 1, firstly detecting the frequency of a grid-connected point of an energy storage power station, comparing the frequency of the grid-connected point with a frequency modulation dead zone of the energy storage power station, judging whether the frequency modulation dead zone of the energy storage power station is exceeded, entering step 2 if the frequency modulation dead zone of the energy storage power station is exceeded, and continuously detecting the frequency if the frequency modulation dead zone of the energy storage power station is not exceeded;
step 2, calculating an active output instruction value of the energy storage power station according to the frequency variation of the grid-connected point, judging whether the upper limit and the lower limit of the active output of the energy storage power station are exceeded, if yes, participating in frequency adjustment according to the upper limit and the lower limit of the active output of the energy storage power station, and if not, transmitting the calculated active output instruction value to the energy storage power station for execution;
step 3, judging whether the frequency of the grid-connected point exceeds the lowest frequency point or the highest frequency point, returning to the step 2 if the frequency does not exceed the lowest frequency point or the highest frequency point, and collecting the lowest frequency point or the highest frequency point if the frequency exceeds the lowest frequency point or the highest frequency point;
and 4, correcting and calculating an active output command value of the energy storage power station, judging whether the frequency of the grid-connected point exceeds a maximum frequency support threshold, returning to the step 1 if the frequency exceeds the maximum frequency support threshold, and continuously executing the corrected active output command value if the frequency exceeds the maximum frequency support threshold.
2. The method for supporting and controlling the active frequency of an energy storage power station according to claim 1, wherein in the step 2, when f is less than or equal to f ld When the energy storage power station needs to increase active power, the expression of the increased active power is as follows:
ΔP l ＝-k l1 (f-f ld )
wherein DeltaP l For the active power increment, k of the energy storage power station when the frequency of the grid-connected point drops l1 Is the first section frequency modulation proportionality coefficient when the frequency is low, f is the frequency of a grid-connected point, f ld The energy storage power station frequency modulation dead zone lower limit value;
when f is greater than or equal to f hd When the energy storage power station needs to reduce the active power, the expression of the active power of the energy storage power station is as follows:
ΔP h ＝-k h1 (f-f hd )
in the middle of，ΔP h Active power reduction, k of energy storage power station when grid-connected point frequency rises h1 Is the first section frequency modulation proportionality coefficient at high frequency, f hd And the energy storage power station frequency modulation dead zone upper limit value is obtained.
3. The energy storage power station active frequency support control method of claim 2, wherein k is l1 The calculated expression of (2) is as follows:
wherein P is max For the maximum value of the active output of the energy storage power station, P ref0 For the initial value of the active output command of the energy storage power station, f min The minimum operating frequency allowed for the grid;
the k is h1 The calculated expression of (2) is as follows:
wherein P is min Is the minimum value of the active output of the energy storage power station, f max For the maximum operating frequency allowed by the grid.
4. The energy storage power station active frequency support control method according to claim 3, wherein the energy storage power station active output command value is calculated as follows:
when f is less than or equal to f ld When (1):
P ref ＝P ref0 +ΔP l
when f is greater than or equal to f hd When (1):
P ref ＝P ref0 +ΔP h
wherein P is ref The power output command value is an active output command value of the energy storage power station.
5. A storage according to claim 4The active frequency support control method of the energy power station is characterized in that when the delta P is l If P when the frequency of the grid connection point drops ref If the energy storage power station active output maximum value is larger than the energy storage power station active output maximum value, the energy storage power station active output maximum value participates in frequency adjustment, otherwise P is added ref Issuing to an energy storage power station for execution;
when DeltaP l If P when the frequency of the grid-connected point rises ref If the power output is smaller than the minimum value of the active output of the energy storage power station, the power station participates in frequency adjustment according to the minimum value of the active output, otherwise P is added ref And issuing the power to an energy storage power station for execution.
6. The method for supporting and controlling the active frequency of an energy storage power station according to claim 1, wherein in the step 3, when f is less than or equal to f ld If the grid-connected point frequency does not reach the lowest frequency point, continuously increasing active power according to the method in the step 2, otherwise, acquiring the grid-connected point frequency of the lowest point, and entering a frequency supporting process of the second section;
when f is greater than or equal to f hd And (2) if the grid-connected point frequency does not reach the highest frequency point, continuing to reduce the active power according to the method in the step (2), otherwise, acquiring the grid-connected point frequency of the highest point, and entering a frequency supporting process of the second section.
7. The method for supporting and controlling the active frequency of the energy storage power station according to claim 1, wherein the correction calculation formula of the active output command value of the energy storage power station in the step 4 is as follows:
when f is less than or equal to f ld When (1):
ΔP l ′＝-k l2 (f lmin -f)
wherein DeltaP' l Correction value k for active increment of energy storage power station l2 Is the second-stage frequency modulation proportionality coefficient at low frequency, f lmin Is the lowest point frequency;
when f is greater than or equal to f hd When (1):
ΔP h ′＝-k h2 (f hmax -f)
wherein DeltaP' h Repair for energy storage power station active reductionPositive value, k h2 Is the second-stage frequency modulation proportionality coefficient at high frequency, f hmax Is the highest point frequency.
8. The method of claim 7, wherein k is l2 The calculated expression of (2) is as follows:
wherein f l A lower limit value that is a maximum frequency support threshold;
the k is h2 The calculated expression of (2) is as follows:
wherein f h The upper limit value of the threshold is supported for the maximum frequency.
9. The method of claim 7, wherein step 4 compares the grid-connected point frequency with the lower limit value of the maximum frequency support threshold value at low frequency, if the grid-connected point frequency is greater than the lower limit value of the maximum frequency support threshold value, returning to step 1, otherwise calculating a corrected active output command value, and then repeating step 2, wherein the expression of the corrected active output command value is as follows:
P ref ＝P ref0 +ΔP l ′。
10. the method according to claim 7, wherein step 4 compares the grid-connected point frequency with the upper limit value of the maximum frequency support threshold value at high frequency, if the grid-connected point frequency is smaller than the lower limit value of the maximum frequency support threshold value, returning to step 1, otherwise calculating a corrected active output command value, and then repeating step 2, wherein the expression of the corrected active output command value is as follows:
P ref ＝P ref0 +ΔP h ′。
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| CN202310285034.9A CN116613772A (en) | 2023-03-22 | 2023-03-22 | Active frequency support control method for energy storage power station |
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