CN113783237B - Energy storage fast frequency modulation control method considering response delay - Google Patents
Energy storage fast frequency modulation control method considering response delay 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
- H02J3/38—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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- 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
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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
- H02J3/381—Dispersed generators
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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
- 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
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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
- 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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
The invention discloses an energy storage fast frequency modulation control method considering response delay, which comprises the steps of acquiring the frequency and the frequency change rate of a grid-connected point of a new energy storage station in real time; calculating a power output instruction for performing auxiliary frequency modulation support control on the energy storage system according to the grid-connected point frequency and the frequency change rate by using the sampling frequency and the frequency modulation requirement; on the basis of considering the response delay and the response time of the energy storage output, short-term change prediction calculation and smoothing processing are carried out on the power output instruction of the sampling frequency grade, and the energy storage output instruction which can be reasonably responded by the energy storage device is obtained. According to the invention, on the premise of considering the energy storage response capability, the following effect of the energy storage device on the energy storage instruction can be better improved, and the following capability of the energy storage device on the real frequency modulation power requirement is further enhanced, so that the control effect of auxiliary frequency modulation support control of the energy storage device is enhanced to the maximum extent, and the support capability of a new energy storage station on the power grid frequency is better exerted.
Description
Technical Field
The invention belongs to the field of frequency modulation of power systems, relates to a frequency modulation control method for new energy storage, and particularly relates to an energy storage rapid frequency modulation control method considering response delay.
Background
With the gradual exploitation of fossil energy and the gradual increase of the demand for energy, the relationship between human beings and the nature is increasingly tense. Under the background, the country proposes to construct a new power system mainly based on new energy, which means that new energy grid connection and its related technologies become important directions for future power technology development.
The total installed photovoltaic capacity of a fan in China increases year by year, but due to the volatility of wind and light resources and the power frequency decoupling characteristic of a voltage type inverter, a regional power grid has an upper limit of new energy access under the condition of ensuring the frequency stability and safety margin, and the phenomenon of abandoning a lot of light and wind is caused. Although the photovoltaic research of the fan is mature in recent years, the fan can also utilize the rotor kinetic energy to provide virtual inertia and primary frequency modulation capacity for a power grid by means of pitch angle control and the like, the fan rotor has small energy, the rotating speed of the fan is reduced to a critical limit when the fan rotor generally participates in the frequency modulation function for about ten seconds, and even the fan rotor quits the frequency modulation function and recovers the rotating speed from the reverse suction power of a system, so that the secondary falling of the system frequency is caused.
Therefore, the reasonable operation of the new energy auxiliary frequency modulation service requires the participation of large-scale energy storage, and a great number of commercial energy storage projects are applied to the field of domestic and foreign auxiliary services, so that the requirement and the control strategy of the energy storage frequency modulation become the current research hotspot. The fundamental purpose of the stored energy participating in frequency modulation is to provide short-term power support for the auxiliary new energy power supply to improve the frequency modulation effect of the system, and to reduce the loss of the conventional unit participating in frequency modulation by utilizing the rapid power throughput capacity of the auxiliary new energy power supply and improve the economy of the frequency modulation function of the conventional power supply. Therefore, an energy storage device with corresponding capacity must be configured for the new energy station to perform reasonable auxiliary frequency modulation control, and the frequency support effect of the new energy station on the power grid is better realized.
The frequency support of the power grid can be mainly divided into inertia control and primary frequency modulation control according to collected signals, the inertia and primary frequency modulation control is mainly realized by collecting related operation parameters in the operation process of the power system and controlling the power electronic device through trend prediction and frequency support capability fitting, so that the new energy system can also externally present the frequency support capability similar to that of the traditional thermal power system. The control effect depends on one hand on the operating characteristics of the new energy system itself and on the other hand on the associated algorithmic function.
Although research on the aspect of wind and light frequency modulation control is relatively deep at present, in the face of establishment of a carbon neutralization target, a new batch of new energy storage stations are started, a frequency modulation control strategy for the energy storage stations or the new energy storage stations is still to be perfected, and the method for better playing the advantages of the energy storage device, such as high climbing rate, quick response time and high control precision, and further improving the frequency modulation capability of related stations is still to be researched.
Object of the Invention
The invention aims to solve the problems in the prior art, and provides an energy storage fast frequency modulation control method considering response delay, which can acquire the frequency and the frequency change rate of a grid-connected point of a new energy storage station in real time, calculate a power output instruction for performing auxiliary frequency modulation support control on an energy storage system according to the grid-connected point frequency and the frequency change rate and sampling frequency and frequency modulation requirements, and perform short-term change prediction calculation and smoothing processing on the power output instruction of a sampling frequency grade on the basis of considering energy storage output response delay and response time to obtain an energy storage output instruction which can be reasonably responded by an energy storage device.
Disclosure of Invention
The invention provides an energy storage fast frequency modulation control method considering response delay, which comprises the following steps:
step 1: acquiring the frequency and the frequency change rate of a grid-connected point of the new energy storage station in real time;
and 2, step: judging whether the energy storage device participates in virtual inertia control in the previous control period, if so, judging whether the frequency change rate meets a virtual inertia control exit threshold value, and if so, controlling the position to be zero; if not, judging whether the frequency change rate meets a virtual inertia control entry threshold value or not, and if so, controlling the position I; determining whether the virtual inertia is input at the moment according to the control bit; the relevant characterizing parameters include: virtual inertia control parameters, primary frequency modulation control parameters, virtual inertia control entering a dead zone, virtual inertia control exiting the dead zone, primary frequency modulation control entering the dead zone, energy storage output control command calculation window length, energy storage output change rate prediction gain coefficient and energy storage output impulse compensation coefficient;
and 3, step 3: judging whether the frequency deviation of the grid-connected point is greater than a primary frequency modulation control threshold value, if so, inputting primary frequency modulation control in the control period;
and 4, step 4: calculating an energy storage power output instruction according to the actual participation condition of a control link and the sampling frequency and frequency modulation requirements;
and 5: on the basis of considering the actual output of the energy storage output response delay and the response time, short-term change prediction calculation and smoothing processing are carried out on the power output instruction of the sampling frequency grade, and the energy storage output instruction which can be reasonably responded by the energy storage device is obtained through calculation.
The invention has the beneficial effects that:
the invention provides an energy storage fast frequency modulation control method considering response delay. The method can collect frequency and frequency change rate, calculate the power output instruction required by the energy storage device at the moment on the basis of considering the frequency modulation requirement, reasonably predict the short-term change of the energy storage instruction on the basis of considering the influence of response delay time and response performance of the energy storage device on the actual control effect, and accordingly correct the amplitude and frequency of the energy storage output instruction to enable the energy storage device to output the power value which can better fit the system frequency modulation requirement, so that the rapid frequency modulation support control effect of the energy storage device is strengthened to the maximum degree, and the support capability of the new energy storage station on the power grid frequency is better exerted.
Drawings
Fig. 1 is a flow chart of the energy storage fast frequency modulation control method according to the present invention.
Fig. 2 is a Simulink simulation experiment model constructed for verifying the correctness of the algorithm according to the embodiment of the present invention.
Fig. 3 is frequency variation data of an experiment for removing a fault of a synchronous machine set according to an embodiment of the present invention.
FIG. 4 shows an embodiment of the present invention without look-ahead predicted tank power control command and tank actual response power.
FIG. 5 is a diagram of an embodiment of the present invention with look-ahead stored energy power control command and stored energy actual response power.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, it is an implementation flow of the present invention. The method comprises the following specific steps:
According to specific operation requirements, the human-computer interface obtains control parameters such as: set value f of primary frequency modulation control dead zone 2 Control of virtual inertia frequency rate of change into setpoint R 1 Virtual inertia frequency rate of change control exit setpoint R 2 Energy storage power control command limit P limit (ii) a And inputting a specific virtual inertia control parameter H, a primary frequency modulation control parameter K and a control flag position R to be 0 according to the control target, and finishing algorithm initialization. And (5) entering the step 1 after the completion.
Reading data segments required by the algorithm from a database or a data acquisition device, and extracting the actual measurement frequency f of the grid-connected point with a time mark t And the actually measured frequency change rate of the grid connection point
And (5) entering the step (2) after the completion.
And reading the control zone bit, wherein if the control zone bit is 0, the last control period control strategy does not comprise virtual inertia control, and if the control zone bit is 1, the last control period control strategy comprises virtual inertia control.
And if the control flag bit is 0, judging whether the frequency change rate reaches an inertia control entering condition according to the following formula, if so, controlling the flag position 1, otherwise, controlling the flag position 0, and entering the step 3.
Wherein
Is the rate of change of frequency, R 1 A dead band threshold is entered for virtual inertia control.
And if the control flag bit is 1, judging whether the frequency change rate reaches an inertia control exit condition according to the following formula, if so, controlling the flag position to be 0, otherwise, controlling the flag position to be 1, and entering the step 3 after the control is finished.
Wherein
Is the rate of change of frequency, R 2 The dead band threshold is exited for the virtual inertia control.
Reading a control flag bit, and judging whether the frequency deviation delta f is greater than a set value f of a primary frequency modulation control dead zone 2 And judging whether the frequency deviation meets a dead zone threshold value for entering primary frequency modulation control or not according to the following formula.
Δf＞f 2
If the control flag bit is 1 but does not satisfy the primary frequency modulation judgment condition, the cycle time interval optimization control only participates in a virtual inertia control link, and the active power regulating quantity delta P of the cycle time interval optimization control is st The calculation can be obtained by the following formula, and the step 4 is executed after the calculation is finished.
If the primary frequency modulation judgment condition is met but the control flag bit is 0, the optimization control of the cycle time interval only participates in the primary frequency modulation link, and the active power regulating quantity delta P of the loop time interval is st The calculation can be obtained by the following formula, and the step 4 is executed after the calculation is finished.
If the primary frequency modulation judgment condition is met and the control flag bit is 1, the cycle time interval optimization control is participated by a virtual inertia control link and a primary frequency modulation link, and the active power regulating quantity delta P of the cycle time interval optimization control is st Can be calculated from the following formulaAnd (4) after the calculation is finished, entering the step 4.
If the formula primary frequency modulation judgment condition is not met and the control flag bit is 0, the optimization control of the cycle time interval is exited, and the step 1 is entered after a delay instruction is added to a control period.
Step 4, predicting the energy storage power and smoothing the actual energy storage output
Determining the actual energy storage instruction output frequency of the algorithm according to the energy storage response delay and the time when the energy storage response reaches the steady-state value; for the sampling frequency energy storage instruction within the time scale of the actual energy storage output instruction output, if the sampling frequency energy storage instruction does not monotonically increase or decrease, the actual energy storage output is calculated according to the following formula,
wherein Δ P st An active power adjustment instruction which is actually output by the energy storage device; delta P stn Representing the nth sampling frequency active power regulating instruction in the actual energy storage output instruction output time scale; t represents that the actual energy storage output instruction output time scale comprises T sampling frequency active power regulating instructions;
for the sampling frequency energy storage instruction in the time scale of the actual energy storage output instruction output, if the sampling frequency energy storage instruction monotonically increases or decreases, the actual energy storage output is calculated according to the following formula,
wherein Δ P st An active power adjustment instruction which is actually output by the energy storage device; delta P stn Representing the nth sampling frequency active power regulating instruction in the actual energy storage output instruction output time scale; t represents that T sampling frequencies are active within the output time scale of the actual energy storage output instructionA power adjustment command; and delta t represents the period of an active power regulation command actually output by the energy storage device, and A represents an energy storage output change rate prediction gain coefficient.
Correcting the active power regulating command actually output by the energy storage device according to the proportion of the active power regulating command impulse actually output by the original energy storage device to the actual output impulse of the energy storage device, wherein the active power regulating command is specifically as follows
ΔP st_real ＝C st_real ×ΔP st
Wherein Δ P st_real Adjusting the command for the real output active power of the corrected energy storage device; c st_real The compensation coefficient (namely the proportion of the actual output impulse of the active power regulation instruction impulse to the energy storage device) of the energy storage output impulse can be measured through a typical fault scene and is a constant value; delta P st And adjusting the command for the active power actually output by the energy storage device.
Step 5, detecting whether the externally output energy storage power control instruction exceeds the limit
For stored energy power control command P st The judgment was made by the following equation.
P st ＞P limit
If not, directly outputting an energy storage control instruction P st After the energy storage unit is finished, adding a delay instruction to a control period, and then entering a step I to enter next cycle control; if yes, updating the energy storage power control instruction P st Controlling a command limit P for energy storage power limit Then outputs the updated energy storage control instruction P st And (4) after the energy storage unit is finished, adding a delay instruction to a control period, and entering step 1 to enter next cycle control.
The process of the invention is illustrated below by means of a specific example. As shown in fig. 3, for BPA simulation frequency fluctuation data of a certain synchronizer fault in the region of Jiangsu, the installed capacity of the unit is cut off to be 1000MW, the total installed capacity of the unit in the region is 71238MW, and the load is 101504MW, and the steps of the system for virtual inertia and primary frequency modulation control considering energy storage response delay are as follows:
1. and simulating the frequency data of the fault condition of the synchronous machine according to the BPA.
2. The frequency data is input into an algorithm model shown in fig. 2 for calculation, so as to obtain a power output command.
3. And outputting the algorithm instruction to an equivalent energy storage model with time delay shown in figure 2 to obtain corresponding energy storage response data.
4. And calculating the mean square error of the algorithm instruction data and the energy storage response data of the energy storage model so as to test the tracking capability of the energy storage model response to the algorithm instruction, thereby testing the improvement effect of the algorithm on the frequency modulation supporting capability.
As can be seen from fig. 4, if the look-ahead prediction method is not used, there is always a response delay in the actual response of the energy storage with respect to the energy storage command, and this delay will affect the control effect of the frequency modulation control algorithm, and will cause the power oscillation to further deteriorate the frequency situation under the special condition.
After the advanced prediction method is added, as shown in fig. 5, the energy storage instruction can basically and completely track the algorithm instruction after the beginning of the energy storage instruction is delayed, so that the frequency modulation control algorithm can better complete the expected control effect, and the frequency modulation supporting capability of the energy storage stations with the same scale is further improved.
TABLE 1 follow-up error for algorithmic commands with and without the look-ahead response
Based on the specific error calculation, it can also be seen that the following mean square error for the instruction without look-ahead is 1.516e -7 While the command-following mean square error with look-ahead described above is 5.932e -8 Substantially reduced by an order of magnitude, and this gap increases further as simulation time lengthens.
According to the embodiment, the amplitude and the frequency of the energy storage output instruction can be corrected by the method provided by the invention, so that the energy storage device can actually output the power value which can better fit the system frequency modulation requirement, the control effect of the rapid frequency modulation support control of the energy storage device is enhanced to the maximum extent, and the support capability of the new energy storage station on the power grid frequency is better exerted.
Claims (5)
1. An energy storage fast frequency modulation control method considering response delay is characterized by comprising the following steps:
step 1: acquiring the frequency and the frequency change rate of a grid-connected point of a new energy storage station in real time;
step 2: judging whether the energy storage device participates in virtual inertia control in the previous control period, if so, judging whether the frequency change rate meets a virtual inertia control exit threshold value, and if so, controlling the position to be zero; if not, judging whether the frequency change rate meets a virtual inertia control entry threshold value or not, and if so, controlling the position I; determining whether the virtual inertia is input at the moment according to the control bit;
and step 3: judging whether the frequency deviation of the grid-connected point is greater than a primary frequency modulation control threshold value, if so, inputting primary frequency modulation control in the control period;
and 4, step 4: calculating an energy storage power output instruction according to the participation condition of a specific control link and the sampling frequency and frequency modulation requirements; specifically, the actual energy storage instruction output frequency of the algorithm is determined according to the energy storage response delay and the time when the energy storage response reaches a steady-state value; and for the sampling frequency energy storage instruction in the time scale of the actual energy storage output instruction output, if the sampling frequency energy storage instruction does not monotonically increase or decrease, calculating the actual energy storage output according to the following formula:
wherein, Δ P st An active power adjustment command which is actually output to the energy storage device; delta P stn Representing the nth sampling frequency active power regulating instruction within the output time scale of the active power regulating instruction actually output to the energy storage device; t represents that the active power output time scale actually output to the energy storage device comprises T sampling frequencies of active powerA rate adjustment instruction;
for the sampling frequency energy storage instruction in the time scale of the actual energy storage output instruction output, if the sampling frequency energy storage instruction is monotonously increased or decreased; the actual stored energy output is calculated as follows:
wherein, Δ P st An active power adjustment command which is actually output to the energy storage device; delta P stn Representing the nth sampling frequency active power regulating instruction within the output time scale of the active power regulating instruction actually output to the energy storage device; t represents that the active power regulation instruction actually output to the energy storage device comprises T sampling frequency active power regulation instructions in total within the output time scale; delta t represents the period of an active power regulation command actually output to the energy storage device, and A represents an energy storage output change rate prediction gain coefficient;
and 5: on the basis of considering the response delay and the response time of the energy storage output, performing short-term change prediction calculation and smoothing on the power output instruction at the sampling frequency level, and calculating to obtain the energy storage output instruction which can reasonably respond to the energy storage device, specifically, correcting the active power regulation instruction actually output by the energy storage device according to the proportion of the active power regulation instruction impulse actually output to the energy storage device to the actual output impulse of the energy storage device, wherein the following formula is specifically shown:
ΔP st_real ＝C st_real ×ΔP st ，
wherein, Δ P st_real Adjusting an instruction for the corrected active power actually output to the energy storage device; c st_real Outputting an impulse compensation coefficient for the energy storage, namely measuring the proportion of the active power regulation instruction impulse actually output to the energy storage device to the actual output impulse of the energy storage device to be a constant value through a fault scene; delta P st The command is adjusted for the active power actually output to the energy storage device.
2. A method for fast frequency modulation control of stored energy taking response delay into account as claimed in claim 1, further comprising:
taking the moment when the frequency or the frequency change rate of the power grid exceeds a preset dead zone threshold value as the entering moment of a control algorithm, and acquiring the actual power output of the energy storage device corresponding to the current moment from a signal acquisition device or a data interface at the moment as the initial value of the active power entering the algorithm;
and according to the frequency modulation requirement and the active power regulating quantity corresponding to the moment calculated by the algorithm, controlling the energy storage device after superposing the active power regulating quantity on the initial value of the active power, and judging whether the energy storage device participates in the energy storage fast frequency modulation control at the next moment.
3. The energy storage fast frequency modulation control method considering response delay according to claim 1, characterized in that the virtual inertia control is prevented from being excessively adjusted by setting different dead zone thresholds for entering and exiting the virtual inertia control;
marking whether virtual inertia control is put into a previous control period or not through the control zone bit, reading the control zone bit when acquiring the frequency and the semaphore of the frequency change rate, and if the control zone bit is 0, the control strategy of the previous control period does not contain the virtual inertia control;
if the control flag bit is 1, the control strategy of the previous control period comprises virtual inertia control;
and calculating whether the virtual inertia control is put into the control period or not by combining the control flag bit and different dead zone thresholds for entering and exiting the virtual inertia control.
4. A method as claimed in claim 3, wherein if the control flag is 0, then determining whether the frequency change rate reaches the inertia control entry condition according to the following equation:
wherein
Is the rate of change of frequency, R 1 Entering a dead zone threshold for virtual inertia control, and if the dead zone threshold is met, controlling a mark position 0;
if the control flag bit is 1, judging whether the frequency change rate reaches an inertia control exit condition according to the following formula:
wherein
Is the rate of change of frequency, R 2 Exiting a dead zone threshold for virtual inertia control, and if the dead zone threshold is met, controlling a mark position 0;
and then, determining whether the virtual inertia control is put into use at the moment according to the value of the control flag bit.
5. The method for controlling the fast frequency modulation of the energy storage device considering the response delay as claimed in claim 1, wherein the active power adjustment amount corresponding to the energy storage device is determined according to the preset frequency modulation droop curve and the corresponding grid frequency and frequency change rate:
if the control flag bit is 1 but the frequency deviation is smaller than the primary frequency modulation dead zone, the optimization control of the cycle time interval only participates in a virtual inertia control link, and the energy storage power control instruction is calculated by the following formula:
wherein, Δ P st1 Is an active power adjustment quantity, H is a virtual inertia control constant,
in order to be the rate of change of the frequency,
the initial value of the active power entering the algorithm is obtained;
if the frequency deviation is larger than the primary frequency modulation dead zone but the control flag bit is 0, only the primary frequency modulation link participates in the cycle time period optimization control, and the energy storage power control instruction is calculated according to the following formula:
wherein, Δ P st1 Is an active power regulating quantity, K is a primary frequency modulation control constant, f 0 Is a frequency reference value, f t In order to obtain the grid-connected point frequency,
an active power initial value for entering an algorithm is obtained;
if the frequency deviation is larger than the primary frequency modulation dead zone and the control flag bit is 1, the cycle time interval optimization control is participated by a virtual inertia control link and a primary frequency modulation link, and the energy storage power control instruction is calculated by the following formula:
wherein, Δ P st1 Is an active power regulating quantity, H is a virtual inertia control constant, K is a primary frequency modulation control constant, f 0 Is a frequency reference value, f t In order to achieve the grid-connected point frequency,
in order to be the rate of change of the frequency,
the initial value of the active power entering the algorithm.
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