CN116436036A - Energy storage system frequency modulation control method considering random fluctuation of new energy - Google Patents

Energy storage system frequency modulation control method considering random fluctuation of new energy Download PDF

Info

Publication number
CN116436036A
CN116436036A CN202310487478.0A CN202310487478A CN116436036A CN 116436036 A CN116436036 A CN 116436036A CN 202310487478 A CN202310487478 A CN 202310487478A CN 116436036 A CN116436036 A CN 116436036A
Authority
CN
China
Prior art keywords
energy storage
frequency modulation
frequency
energy
load disturbance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310487478.0A
Other languages
Chinese (zh)
Inventor
王玉荣
窦爽恺
汤一天
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Southeast University
Original Assignee
Southeast University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Southeast University filed Critical Southeast University
Priority to CN202310487478.0A priority Critical patent/CN116436036A/en
Publication of CN116436036A publication Critical patent/CN116436036A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • 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
    • 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
    • H02J3/381—Dispersed generators
    • 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]
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses an energy storage system frequency modulation control method considering new energy random fluctuation, and belongs to the technical field of electric power. The method comprises the following steps: establishing a power system frequency response model taking into account energy storage; calculating the energy storage frequency modulation coefficient requirement under load disturbance; calculating the energy storage frequency modulation coefficient demand increment containing random fluctuation of new energy; considering the energy storage frequency modulation coefficient requirement under the load disturbance, and calculating the frequency modulation energy requirement of the energy storage system of the power system frequency response model under the load disturbance; and calculating the energy increment required by energy storage of the power system frequency response model containing the random fluctuation of the new energy.

Description

Energy storage system frequency modulation control method considering random fluctuation of new energy
Technical Field
The invention relates to the technical field of electric power, in particular to an energy storage system frequency modulation control method considering random fluctuation of new energy.
Background
Clean energy represented by wind energy and solar energy gradually replaces traditional fossil energy, and a power system in China has the characteristic of gradually penetrating renewable energy in a high proportion. However, the randomness and volatility of clean energy power generation will result in increased power source side power fluctuations. Meanwhile, the low inertia power system added by the high proportion power electronic equipment enables the frequency change rate and the frequency deviation of the power grid to be obviously increased when the power load is disturbed, and brings great challenges to the frequency modulation of the power system. Therefore, a new frequency modulation mode needs to be introduced to solve the frequency modulation problem of the traditional frequency modulation unit. The energy storage system has high response speed and high control precision, and can effectively participate in rapid frequency modulation of the power system.
However, when the energy storage system is used for frequency modulation in the face of load disturbance and new energy fluctuation, the energy storage frequency modulation coefficient and the energy required by energy storage frequency modulation are required to be calculated so as to judge the energy storage switching action condition.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an energy storage system frequency modulation control method considering new energy random fluctuation, which can calculate an energy storage frequency modulation coefficient increment control method containing new energy random fluctuation and an energy storage energy increment control method of a power system frequency response model containing new energy random fluctuation. .
The aim of the invention can be achieved by the following technical scheme:
a frequency modulation control method of an energy storage system considering random fluctuation of new energy comprises the following steps:
step 1, establishing a power system frequency response model taking into account energy storage;
step 2, calculating the energy storage frequency modulation coefficient requirement under load disturbance;
step 3, calculating the energy storage frequency modulation coefficient demand increment containing new energy random fluctuation
Step 4, considering the energy storage frequency modulation coefficient requirement under the load disturbance, and calculating the frequency modulation energy requirement of the energy storage system of the power system frequency response model under the load disturbance;
and 5, calculating the energy storage energy increment of the power system frequency response model containing the random fluctuation of the new energy.
Optionally, the method for creating and storing the energy in the power system frequency response model specifically includes the following steps:
establishing a power system frequency response model comprising a synchronous generator set speed regulator, a turbine, a generator and a load; and adding an energy storage frequency modulation loop into the power system frequency response model, and establishing the power system frequency response model taking the energy storage into account.
Optionally, the method for calculating the energy storage frequency modulation factor requirement under load disturbance comprises the following steps:
calculating energy storage frequency modulation coefficient requirements considering frequency deviation limit constraint based on different load disturbance levels; based on different load disturbance levels, calculating energy storage frequency modulation coefficient requirements considering frequency drop minimum point limit constraint; and finally, taking the maximum value of the energy storage frequency modulation coefficient requirement of the obtained constraint of the considered frequency deviation limit and the constraint of the considered frequency drop minimum point limit as the energy storage frequency modulation coefficient requirement under load disturbance.
Optionally, the energy storage frequency modulation coefficient increment calculating method containing the random fluctuation of the new energy source comprises the following steps:
based on different random fluctuation levels of new energy sources, calculating an energy storage frequency modulation coefficient demand increment considering the frequency drop minimum point limit constraint and an energy storage frequency modulation coefficient demand increment considering the frequency deviation limit constraint; the energy storage frequency modulation factor demand is added with the energy storage frequency modulation factor demand, and the maximum value of the sum is the energy storage frequency modulation factor demand under the fluctuation of the new energy.
Optionally, the energy storage frequency modulation factor requirement formula considering the frequency deviation limit constraint is calculated as follows:
Figure BDA0004209089320000021
wherein Δf ∞ For frequency deviation limit, ΔP s For load disturbance, D is the active frequency response coefficient of the load, K m The frequency modulation capacity coefficient can be regulated for the synchronous machine set of the system, 1/R is the gain of the speed regulator, K B Represents the energy storage frequency modulation coefficient under load disturbance, R B Is an energy storage difference adjustment coefficient; by inverse solution of K B Obtaining energy storage frequency modulation coefficient requirement K considering frequency deviation limit constraint under load disturbance B∞ 。
Optionally, the method for calculating the energy storage frequency modulation factor requirement considering the frequency drop minimum limit constraint includes the following steps:
Figure BDA0004209089320000031
wherein Δf m For the frequency dip nadir, ΔP s T is the load disturbance R For the equivalent inertial time constant of the turbine, K B Representing an energy storage frequency modulation coefficient under load disturbance;
a is:
Figure BDA0004209089320000032
a、b、a 0 the method comprises the following steps of:
Figure BDA0004209089320000041
wherein, xi is damping ratio, omega n The natural frequency is:
Figure BDA0004209089320000042
wherein M is the generator rotor inertia time constant, F H For turbine characteristic factor, K B Representing an energy storage frequency modulation coefficient under load disturbance; by inverse solution of K B Obtaining the energy storage frequency modulation coefficient requirement K considering the frequency deviation limit constraint under load disturbance Bm 。
Optionally, the method for calculating the energy storage frequency modulation coefficient demand increment considering the frequency drop minimum limit constraint comprises the following steps:
Figure BDA0004209089320000043
wherein ΔK Bm Delta P for energy storage FM coefficient demand delta considering frequency drop nadir limit constraint add Δf is the sum of the fluctuation power and the disturbance power of the new energy m And M is the generator rotor inertia time constant, and is the lowest point limit value of frequency drop. Wherein A and omega n The energy storage frequency modulation coefficient K taking the lowest point limit constraint of frequency drop into consideration under load disturbance is adopted in calculation B1 And K is B1 ＝max(K B∞ ，K Bm )；ΔK B∞ The energy storage frequency modulation coefficient demand increment is considered for the constraint of the frequency deviation limit value;
b is:
Figure BDA0004209089320000051
c is:
Figure BDA0004209089320000052
optionally, the method for calculating the energy storage frequency modulation factor requirement taking the frequency deviation limit constraint into consideration includes the following steps:
Figure BDA0004209089320000053
wherein ΔK B∞ Delta P for energy storage FM coefficient demand delta taking into account frequency deviation limit constraints new Is the power fluctuation value of the new energy.
Optionally, the method for calculating the frequency modulation energy requirement of the energy storage system of the power system frequency response model under the load disturbance comprises the following steps:
Figure BDA0004209089320000054
wherein E is e For energy storage under load disturbance, K B Representing the energy storage frequency modulation coefficient under load disturbance and substituting the actual value K obtained by the calculation into the calculation B1 ，t a For energy storage run time, t 0 For load disturbance occurrenceTime of day.
Optionally, the method for calculating the increment required by the energy storage energy of the power system frequency response model containing the new energy random fluctuation comprises the following steps:
Figure BDA0004209089320000061
wherein delta E is the difference value of energy required for energy storage under the influence of load disturbance only when new energy randomly fluctuates, and delta P new K is the fluctuation value of new energy power B Representing the energy storage frequency modulation coefficient under load disturbance and substituting the actual value K obtained by the calculation into the calculation B1 ，t a For the energy storage running time, t1 is the new energy fluctuation occurrence time.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a flow chart of a frequency modulation control method of an energy storage system according to the present application, which takes into account random fluctuation of new energy;
FIG. 2 is a graph of a power system frequency response model taking into account stored energy in accordance with the present application;
FIG. 3 shows the frequency variation of the power system under the condition of only load disturbance and constant energy storage frequency modulation coefficient in the embodiment 1 of the present application;
FIG. 4 is a graph showing the frequency change of the power system under the condition of the load disturbance and the new energy fluctuation and the constant energy storage frequency modulation coefficient in the embodiment 1 of the present application;
FIG. 5 is a graph showing the frequency change of the power system under the condition of load disturbance and new energy fluctuation and energy storage frequency modulation coefficient update in embodiment 1 of the present application;
FIG. 6 is a graph showing the frequency variation of the power system under the condition of only load disturbance and constant energy storage frequency modulation coefficient in the embodiment 2 of the present application;
FIG. 7 is a graph showing the frequency change of the power system under the condition of load disturbance and new energy fluctuation and constant energy storage frequency modulation coefficient in embodiment 2 of the present application;
fig. 8 shows the frequency change of the power system under the condition of load disturbance and new energy fluctuation and energy storage frequency modulation coefficient update in embodiment 2 of the present application.
Detailed Description
The following description of the embodiments of the present invention 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 invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
As shown in fig. 1, the embodiment discloses a frequency modulation control method of an energy storage system considering random fluctuation of new energy, which comprises the following steps:
and step 1, establishing a power system frequency response model taking into account energy storage.
Firstly, establishing a frequency response model of a power system comprising a synchronous generator set speed regulator, a turbine, a generator and a load; and adding an energy storage frequency modulation loop into the basic power system frequency response model, and establishing a power system frequency response model taking energy storage into account.
And 2, calculating the energy storage frequency modulation coefficient requirement under load disturbance.
Firstly, calculating energy storage frequency modulation coefficient requirements considering frequency deviation limit constraint based on different load disturbance levels; based on different load disturbance levels, calculating energy storage frequency modulation coefficient requirements considering frequency drop minimum point limit constraint; and finally, taking the maximum value of the energy storage frequency modulation coefficient requirement of the obtained constraint of the considered frequency deviation limit and the constraint of the considered frequency drop minimum point limit as the energy storage frequency modulation coefficient requirement under load disturbance.
The energy storage frequency modulation coefficient demand formula considering the frequency deviation limit constraint is calculated based on different load disturbance levels and is as follows:
Figure BDA0004209089320000081
wherein Δf ∞ For frequency deviation limit, ΔP s For load disturbance, D is the active frequency response coefficient of the load, K m The frequency modulation capacity coefficient can be regulated for the synchronous machine set of the system, 1/R is the gain of the speed regulator, K B Represents the energy storage frequency modulation coefficient under load disturbance, R B Is an energy storage difference adjustment coefficient. By inverse solution of K B The energy storage frequency modulation coefficient requirement taking the frequency deviation limit constraint into consideration under the load disturbance is recorded as K B∞ 。
The energy storage frequency modulation coefficient demand formula considering the frequency drop minimum point limit constraint is calculated based on different load disturbance levels and is as follows:
Figure BDA0004209089320000082
wherein Δf m For the frequency dip nadir, ΔP s T is the load disturbance R For the equivalent inertia time constant of the turbine, D is the active frequency response coefficient of the load, K B Represents the energy storage frequency modulation coefficient under load disturbance, R B K is the energy storage difference adjustment coefficient m The frequency modulation capacity coefficient can be adjusted for the system synchronous machine set, and 1/R is the gain of the speed regulator.
A is:
Figure BDA0004209089320000083
a、b、a 0 the method comprises the following steps of:
Figure BDA0004209089320000091
wherein, xi is damping ratio, omega n The natural frequency is:
Figure BDA0004209089320000092
wherein M is the generator rotor inertia time constant, F H Is a turbineMechanical characteristic coefficient, K B Representing the energy storage frequency modulation factor under load disturbance. By inverse solution of K B Obtaining the energy storage frequency modulation coefficient requirement taking the frequency deviation limit constraint into consideration under load disturbance and recording the energy storage frequency modulation coefficient requirement as K Bm 。
The formula can solve K by using fitting method Bm The fitting formula for calculating the energy storage frequency modulation coefficient according to the lowest point of the frequency drop is as follows:
K Bm ＝9.0462×10 -6 ×ΔP s 3 -2.8882×10 -4 ×ΔP s 2 +0.0239×ΔP s -0.1022
step 3, calculating random fluctuation containing new energyEnergy storage frequency modulation coefficient demand increment。
Firstly, calculating the energy storage frequency modulation coefficient demand increment considering the limit constraint of the lowest point of frequency drop based on the random fluctuation level of different new energy sources; secondly, calculating the energy storage frequency modulation coefficient demand increment considering the frequency deviation limit constraint based on the random fluctuation level of different new energy sources; and finally, respectively adding the obtained energy storage frequency modulation coefficient demand increment and the energy storage frequency modulation demand under the disturbance of respective loads, wherein the sum maximum value is the energy storage frequency modulation coefficient demand under the fluctuation of the new energy.
The energy storage frequency modulation coefficient demand increment formula considering the frequency drop minimum limit constraint is calculated as follows:
Figure BDA0004209089320000101
wherein ΔK Bm Delta P for energy storage FM coefficient demand delta considering frequency drop nadir limit constraint add Δf is the sum of the fluctuation power and the disturbance power of the new energy m And M is the generator rotor inertia time constant, and is the lowest point limit value of frequency drop. Wherein A and omega n The energy storage frequency modulation coefficient taking the lowest point limit constraint of frequency drop into consideration under load disturbance is recorded as K B1 And K is B1 ＝max(K B∞ ，K Bm )；
B is:
Figure BDA0004209089320000102
c is:
Figure BDA0004209089320000103
the energy storage frequency modulation coefficient demand formula considering the frequency deviation limit constraint in the calculation is as follows:
Figure BDA0004209089320000104
wherein ΔK B∞ Delta P for energy storage FM coefficient demand delta taking into account frequency deviation limit constraints new Is the power fluctuation value of the new energy.
And 4, considering the energy storage frequency modulation coefficient requirement under the load disturbance, and calculating the frequency modulation energy requirement of the energy storage system of the power system frequency response model under the load disturbance.
The frequency modulation energy demand formula of the energy storage system of the power system frequency response model under the calculation load disturbance is as follows:
Figure BDA0004209089320000111
wherein E is e For energy storage under load disturbance, K B Representing the energy storage frequency modulation coefficient under load disturbance and substituting the actual value K obtained by the calculation into the calculation B1 ，t a For energy storage run time, t 0 The moment of occurrence of load disturbance.
And 5, calculating the energy increment required by energy storage of the power system frequency response model containing the random fluctuation of the new energy.
The formula of the energy storage energy increment control method for calculating the power system frequency response model containing the random fluctuation of the new energy is as follows:
Figure BDA0004209089320000112
wherein delta E is the difference value of energy required for energy storage under the influence of load disturbance only when new energy randomly fluctuates, and delta P new K is the fluctuation value of new energy power B Representing the energy storage frequency modulation coefficient under load disturbance and substituting the actual value K obtained by the calculation into the calculation B1 ，t a For the energy storage running time, t1 is the new energy fluctuation occurrence time.
In the embodiment, the total power of the system is 100kW, the load disturbance is 10kW, the fluctuation of the new energy is 1kW, the load disturbance occurs in 1s, the fluctuation of the new energy occurs in 2s, and the energy storage participates in frequency modulation to 200s. The frequency dip nadir limit was set to 0.5Hz and the frequency deviation limit was set to 0.2Hz. The relevant parameters were set as follows:
D＝1，K m ＝0.95，R＝0.05，R B ＝0.01，M＝6.7，T R ＝8，F H ＝0.3，T B ＝0.01。
and calculating the energy storage frequency modulation coefficient requirements under different load disturbance based on the frequency deviation and the frequency drop minimum point limit value. Calculating an energy storage frequency modulation coefficient K according to a frequency deviation formula B1 =0.3; curve fitting is carried out according to a frequency drop minimum point calculation formula, and an energy storage frequency modulation coefficient K is calculated B2 = 0.1168; take the maximum value K B3 ＝max(K B1 K B2 )＝0.3。
And calculating the energy storage frequency modulation coefficient requirements under different new energy fluctuation based on the frequency deviation and the lowest point limit value of the frequency drop. Calculating energy storage frequency modulation coefficient delta K according to a frequency deviation formula B-new1 =0.05; calculating the energy storage frequency modulation coefficient delta K according to the lowest point formula of frequency drop B-new2 =0.088; therefore, the energy storage frequency modulation coefficient under the fluctuation of the new energy is obtained according to the frequency deviation to be K B-new1 =0.35; obtaining the energy storage frequency modulation coefficient K under the fluctuation of new energy according to the lowest point of frequency drop B-new2 = 0.2048; obtaining K by taking the maximum value B-new3 ＝max(K B-new1 ，K B-new2 )＝0.35。
Calculating power system frequency response module under load disturbance according to formulaFrequency modulation energy requirement of energy storage system to obtain E e1 ＝0.335kWh。
Calculating the frequency modulation energy requirement of the energy storage system of the power system frequency response model under new energy fluctuation according to a formula to obtain delta E new1 =0.0353 kWh, the energy storage requirement under the added new energy fluctuation is E new1 ＝0.3703kWh。
Under the condition of only load disturbance, the energy storage frequency modulation coefficient is K B3 In this case, the system frequency change curve after the energy storage action is shown in fig. 3. The load starts to disturb when 1s can be observed, the frequency starts to fluctuate, the minimum value of the frequency drop does not exceed 0.5Hz, and the maximum value of the frequency deviation is controlled to be 0.2Hz.
When new energy source fluctuation is added but the energy storage frequency modulation coefficient is unchanged, a system frequency change curve after energy storage action is shown in figure 4. It is observed that the new energy source starts to fluctuate at 2s, and the maximum value of the frequency deviation is already more than 0.2Hz, although the minimum value of the frequency drop is not more than 0.5 Hz.
When new energy source fluctuation is added, the energy storage frequency modulation coefficient becomes K B-new3 In this case, the system frequency change curve after the energy storage action is shown in fig. 5. The maximum value of the frequency deviation is controlled at 0.2Hz.
Example 2
In the embodiment, the total power of the system is 100kW, the load disturbance is-8 kW, the fluctuation of the new energy is-0.5 kW, the load disturbance occurs in 1s, the fluctuation of the new energy occurs in 2s, and the energy storage participates in frequency modulation to 200s. The frequency dip nadir limit was set to 0.5Hz and the frequency deviation limit was set to 0.2Hz. The relevant parameters were set as follows:
D＝1，K m ＝0.95，R＝0.05，R B ＝0.01，M＝6.7，T R ＝8，F H ＝0.3，T B ＝0.01。
and calculating the energy storage frequency modulation coefficient requirements under different load disturbance based on the frequency deviation and the frequency drop minimum point limit value. Calculating an energy storage frequency modulation coefficient K according to a frequency deviation formula B1 =0.2; curve fitting is carried out according to a frequency drop minimum point calculation formula, and an energy storage frequency modulation coefficient K is calculated B2 =0.075; take the maximum value K B3 ＝max(K B1 ，K B2 )＝0.2。
And calculating the energy storage frequency modulation coefficient requirements under different new energy fluctuation based on the frequency deviation and the lowest point limit value of the frequency drop. Calculating energy storage frequency modulation coefficient delta K according to a frequency deviation formula B-new1 =0.025; calculating the energy storage frequency modulation coefficient delta K according to the lowest point formula of frequency drop B-new2 = 0.0441; therefore, the energy storage frequency modulation coefficient under the fluctuation of the new energy is obtained according to the frequency deviation to be K B-new1 =0.225; obtaining the energy storage frequency modulation coefficient K under the fluctuation of new energy according to the lowest point of frequency drop B-new2 = 0.1191; obtaining K by taking the maximum value B-new3 ＝max(K B-new1 ，K B-new2 )＝0.225。
Calculating the frequency modulation energy requirement of the energy storage system of the power system frequency response model under load disturbance according to a formula to obtain E e1 ＝0.2239kWh。
Calculating the frequency modulation energy requirement of the energy storage system of the power system frequency response model under new energy fluctuation according to a formula to obtain delta E new1 =0.0147 kWh, and the energy storage requirement under adding the new energy fluctuation is E new1 ＝0.2386kWh。
Under the condition of only load disturbance, the energy storage frequency modulation coefficient is K B3 In this case, the system frequency change curve after the energy storage action is shown in fig. 6. The load starts to disturb when 1s can be observed, the frequency starts to fluctuate, the minimum value of the frequency drop does not exceed 0.5Hz, and the maximum value of the frequency deviation is controlled to be 0.2Hz.
When new energy source fluctuation is added but the energy storage frequency modulation coefficient is unchanged, the system frequency change curve after the energy storage action is shown in figure 7. It is observed that the new energy source starts to fluctuate at 2s, and the maximum value of the frequency deviation is already more than 0.2Hz, although the minimum value of the frequency drop is not more than 0.5 Hz.
When new energy source fluctuation is added, the energy storage frequency modulation coefficient becomes K B-new3 In this case, the system frequency change curve after the energy storage action is shown in fig. 8. The maximum value of the frequency deviation is controlled at 0.2Hz.
In conclusion, the energy storage system frequency modulation control considering the random fluctuation of the new energy can be more rapidly and effectively performed through the calculation of the formula.
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 invention. 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.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims.

Claims (10)

1. The energy storage system frequency modulation control method considering the random fluctuation of the new energy is characterized by comprising the following steps of:
step 1, establishing a power system frequency response model taking into account energy storage;
step 2, calculating the energy storage frequency modulation coefficient requirement under load disturbance;
step 3, calculating the energy storage frequency modulation coefficient demand increment containing the random fluctuation of the new energy;
step 4, considering the energy storage frequency modulation coefficient requirement under the load disturbance, and calculating the frequency modulation energy requirement of the energy storage system of the power system frequency response model under the load disturbance;
and 5, calculating the energy increment required by energy storage of the power system frequency response model containing the random fluctuation of the new energy.
2. The method for controlling the frequency modulation of the energy storage system according to claim 1, wherein the step of establishing the power system frequency response model according to the new energy random fluctuation comprises the following steps:
establishing a power system frequency response model comprising a synchronous generator set speed regulator, a turbine, a generator and a load; and adding an energy storage frequency modulation loop into the power system frequency response model, and establishing the power system frequency response model taking the energy storage into account.
3. The energy storage system frequency modulation control method considering new energy random fluctuation according to claim 1, wherein the energy storage frequency modulation coefficient demand calculation method under load disturbance comprises the following steps:
calculating energy storage frequency modulation coefficient requirements considering frequency deviation limit constraint based on different load disturbance levels; based on different load disturbance levels, calculating energy storage frequency modulation coefficient requirements considering frequency drop minimum point limit constraint; and finally, taking the maximum value of the energy storage frequency modulation coefficient requirement of the obtained constraint of the considered frequency deviation limit and the constraint of the considered frequency drop minimum point limit as the energy storage frequency modulation coefficient requirement under load disturbance.
4. The energy storage system frequency modulation control method considering new energy random fluctuation according to claim 1, wherein the energy storage frequency modulation coefficient increment calculation method including new energy random fluctuation comprises the following steps:
based on different random fluctuation levels of new energy sources, calculating an energy storage frequency modulation coefficient demand increment considering the frequency drop minimum point limit constraint and an energy storage frequency modulation coefficient demand increment considering the frequency deviation limit constraint; and respectively adding the energy storage frequency modulation coefficient demand increment and the energy storage frequency modulation coefficient demand, wherein the sum maximum value is the energy storage frequency modulation coefficient demand under new energy fluctuation.
5. The energy storage system frequency modulation control method for accounting for random fluctuation of new energy according to claim 3, wherein the energy storage frequency modulation coefficient demand formula considering the frequency deviation limit constraint is calculated as follows:
Figure FDA0004209089310000021
wherein Δf ∞ For frequency deviation limit, ΔP s For load disturbance, D is the active frequency response coefficient of the load, K m The frequency modulation capacity coefficient can be regulated for the synchronous machine set of the system, 1/R is the gain of the speed regulator, K B Represents the energy storage frequency modulation coefficient under load disturbance, R B Is an energy storage difference adjustment coefficient; by inverse solution of K B Obtaining energy storage frequency modulation coefficient requirement K considering frequency deviation limit constraint under load disturbance B∞ 。
6. The energy storage system frequency modulation control method considering new energy random fluctuation according to claim 3, wherein the energy storage frequency modulation coefficient demand calculation method considering the frequency drop minimum limit constraint comprises the following steps:
Figure FDA0004209089310000022
wherein Δf m For the frequency dip nadir, ΔP s T is the load disturbance R For the equivalent inertial time constant of the turbine, K B Representing an energy storage frequency modulation coefficient under load disturbance;
a is:
Figure FDA0004209089310000031
a、b、a 0 the method comprises the following steps of:
Figure FDA0004209089310000032
wherein, xi is damping ratio, omega n The natural frequency is:
Figure FDA0004209089310000033
wherein M is the inertia time of the generator rotorNumber F H For turbine characteristic factor, K B Representing an energy storage frequency modulation coefficient under load disturbance; by inverse solution of K B Solving the energy storage frequency modulation coefficient requirement K considering the frequency deviation limit constraint under load disturbance Bm 。
7. The energy storage system frequency modulation control method considering new energy random fluctuation according to claim 4, wherein the energy storage frequency modulation coefficient demand increment calculation method considering the frequency drop minimum limit constraint comprises the following steps:
Figure FDA0004209089310000041
wherein ΔK Bm Delta P for energy storage FM coefficient demand delta considering frequency drop nadir limit constraint add Δf is the sum of the fluctuation power and the disturbance power of the new energy m The minimum frequency drop limit value is set, and M is the generator rotor inertia time constant; wherein A and omega n The energy storage frequency modulation coefficient K taking the lowest point limit constraint of frequency drop into consideration under load disturbance is adopted in calculation B1 And K is B1 ＝max(K B∞ ，K Bm )；ΔK B∞ The energy storage frequency modulation coefficient demand increment is considered for the constraint of the frequency deviation limit value;
b is:
Figure FDA0004209089310000042
c is:
Figure FDA0004209089310000043
8. the energy storage system frequency modulation control method considering new energy random fluctuation according to claim 4, wherein the energy storage frequency modulation coefficient demand increment calculation method considering frequency deviation limit constraint comprises the following steps:
Figure FDA0004209089310000044
wherein ΔK B∞ Delta P for energy storage FM coefficient demand delta taking into account frequency deviation limit constraints new Is the power fluctuation value of the new energy.
9. The energy storage system frequency modulation control method considering new energy random fluctuation according to claim 1, wherein the calculation method of the energy storage system frequency modulation energy requirement of the power system frequency response model under load disturbance comprises the following steps:
Figure FDA0004209089310000051
wherein E is e For energy storage under load disturbance, K B Representing the energy storage frequency modulation coefficient under load disturbance and substituting the actual value K obtained by the calculation into the calculation B1 ，t a For energy storage run time, t 0 The moment of occurrence of load disturbance.
10. The energy storage system frequency modulation control method considering new energy random fluctuation according to claim 1, wherein the calculation method of the energy increment required by the energy storage of the power system frequency response model containing new energy random fluctuation comprises the following steps:
Figure FDA0004209089310000052
wherein delta E is the difference value of energy required for energy storage under the influence of load disturbance only when new energy randomly fluctuates, and delta P new K is the fluctuation value of new energy power B Representing energy storage modulation under load disturbanceThe frequency coefficient is recorded as K B1 ，t a For energy storage run time, t 1 The new energy fluctuation occurrence time is the new energy fluctuation occurrence time.
CN202310487478.0A 2023-04-28 2023-04-28 Energy storage system frequency modulation control method considering random fluctuation of new energy Pending CN116436036A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310487478.0A CN116436036A (en) 2023-04-28 2023-04-28 Energy storage system frequency modulation control method considering random fluctuation of new energy

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310487478.0A CN116436036A (en) 2023-04-28 2023-04-28 Energy storage system frequency modulation control method considering random fluctuation of new energy

Publications (1)

Publication Number Publication Date
CN116436036A true CN116436036A (en) 2023-07-14

Family

ID=87087309

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310487478.0A Pending CN116436036A (en) 2023-04-28 2023-04-28 Energy storage system frequency modulation control method considering random fluctuation of new energy

Country Status (1)

Country Link
CN (1) CN116436036A (en)

Similar Documents

Publication Publication Date Title
Chu et al. Towards optimal system scheduling with synthetic inertia provision from wind turbines
Gholamrezaie et al. An optimal frequency control method through a dynamic load frequency control (LFC) model incorporating wind farm
Mallesham et al. Ziegler-Nichols based controller parameters tuning for load frequency control in a microgrid
Takahashi et al. Output power smoothing and hydrogen production by using variable speed wind generators
CN113890056B (en) Power optimal allocation control method and system suitable for wind-storage combined frequency modulation system
CN113098029B (en) Wind power storage combined frequency modulation control method based on wind power short-term prediction
CN107681689A (en) Frequency control parameters choosing method of the double-fed blower fan in micro-capacitance sensor
Spichartz et al. New stability concept for primary controlled variable speed wind turbines considering wind fluctuations and power smoothing
CN110071526A (en) A kind of PMSG blower participates in the adaptive droop control method of mains frequency adjusting
Fang et al. An optimal control strategy for reactive power in wind farms consisting of VSCF DFIG wind turbine generator systems
CN112994051A (en) Capacity optimization configuration method for seawater pumped storage power station with variable-speed unit
Verij Kazemi et al. Adaptive frequency control with variable speed wind turbines using data-driven method
Kord et al. Active hybrid energy storage management in a wind-dominated standalone system with robust fractional-order controller optimized by Gases Brownian Motion Optimization Algorithm
Bhateshvar et al. Impact of wind power generating system integration on frequency stabilization in multi-area power system with fuzzy logic controller in deregulated environment
CN105720596A (en) Frequency modulation method and frequency modulation device for power energy storage system
CN116436036A (en) Energy storage system frequency modulation control method considering random fluctuation of new energy
CN112736991B (en) Novel active voltage control strategy for doubly-fed wind power plant
JP2020127270A (en) Command generation device and command generation method
Varzaneh et al. Constant power control of variable speed wind farm for primary frequency control support
Si et al. Primary frequency stability support of a DFIG in association with pitch angle control
Yang et al. Fast frequency support of a DFIG based on over-speed de-loaded curve
CN111725819A (en) Method and system for battery energy storage to participate in frequency recovery control
Zhang et al. Short-term frequency regulation of power systems based on DFIG wind generation
Tedjoe et al. Analysis of battery-based virtual inertia & primary frequency response on improving frequency dynamics in an island hydro-diesel-PV ac-grid
Benghanem et al. Supervisory control scheme of a wind farm connected to a hybrid microgrid

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination