CN108377004B - Wind-storage coordination frequency modulation method and system based on virtual synchronous machine - Google Patents
Wind-storage coordination frequency modulation method and system based on virtual synchronous machine Download PDFInfo
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- CN108377004B CN108377004B CN201810366839.5A CN201810366839A CN108377004B CN 108377004 B CN108377004 B CN 108377004B CN 201810366839 A CN201810366839 A CN 201810366839A CN 108377004 B CN108377004 B CN 108377004B
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- 230000008859 change Effects 0.000 claims abstract description 46
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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
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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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- H02J3/386—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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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- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
The invention provides a wind-storage coordination frequency modulation method and system based on a virtual synchronous machine. The wind-storage coordination frequency modulation method based on the virtual synchronous machine comprises the following steps: inputting rated frequency of an electric power system, phase-locked loop frequency, sagging control coefficient of a central controller, change rate of system frequency, virtual inertia coefficient of the central controller and rated power of a wind turbine generator set to a wind field frequency modulation power model to obtain wind field frequency modulation power; inputting rated frequency of a power system, phase-locked loop frequency, sagging control coefficient of a virtual synchronous machine of the wind turbine, change rate of system frequency, virtual inertia coefficient of the virtual synchronous machine of the wind turbine and rated power of the wind turbine into a frequency modulation power model of the wind turbine, obtaining frequency modulation power of the wind turbine and distributing the frequency modulation power to the virtual synchronous machine of the wind turbine; the wind field frequency modulation power, the wind turbine generator set frequency modulation power and the power command value are input to an energy storage system frequency modulation power model to obtain energy storage system frequency modulation power which is distributed to a plurality of energy storage systems, and therefore the frequency characteristic of the power system can be improved.
Description
Technical Field
The invention relates to the field of virtual synchronous machines, in particular to a wind-storage coordination frequency modulation method and system based on a virtual synchronous machine.
Background
The frequency of the power system is an important index for measuring the power quality of the power system, and the wind power output has short-time power fluctuation, so that the currently mainstream variable-speed wind turbine generator cannot provide inertial response to the system frequency fluctuation, and the frequency stability and safety of the system are greatly challenged.
In order to improve the frequency characteristic of the system, the virtual synchronous machine technology is applied to a control strategy of the wind turbine, and the virtual synchronous machine of the wind turbine can output power in a short time when the frequency of the system falls, so that wind power has the capacity of participating in the frequency adjustment of the system. The power output by the wind turbine generator system to the system in short time is derived from two parts according to the difference of the wind speed intervals:
(1) At normal wind speed, the wind turbine generator runs in a maximum wind power tracking mode, and the stored rotational kinetic energy can be released by reducing the rotating speed of the fan;
(2) At high wind speed, the wind turbine generator system discards part of wind power by adjusting the pitch angle and outputs rated power, so that the system can be frequency-supported by releasing the wind power discarded under pitch angle control.
However, the participation of the virtual synchronous machine of the wind turbine generator in frequency modulation can cause three problems: 1) The supporting power of the wind turbine generator participating in frequency modulation is zero in the extreme condition, namely when the rotating speed of the rotor of the wind turbine generator is at the minimum rotating speed; 2) In the system frequency recovery process, an MPPT recovery strategy is generally adopted, and in the wind turbine rotating speed recovery process, the active power is accelerated and absorbed by a generator rotor, so that the output electromagnetic power of a fan suddenly drops, and the frequency drops secondarily; 3) The running states of wind turbines in a wind power plant are different at different wind speeds, and the superposition and the difference of wind power output characteristics can cause the problem to be more serious. Because the power shortage of the secondary dropping process of the wind turbine generator system frequency is large, the power amplitude of the secondary dropping process of the wind turbine generator system frequency is simply compensated, and the excessive energy storage capacity is consumed, so that the method has no economical efficiency.
Disclosure of Invention
The embodiment of the invention mainly aims to provide a wind-storage coordination frequency modulation system based on a virtual synchronous machine, which can timely adjust the frequency of a power system, avoid the secondary drop of the frequency of a wind turbine, greatly improve the frequency characteristic of a new energy high-permeability power system and save the energy storage investment cost.
In order to achieve the above object, an embodiment of the present invention provides a wind-storage coordination frequency modulation method based on a virtual synchronous machine, including:
judging whether the phase-locked loop frequency is in a preset range or not;
when the frequency of the phase-locked loop is not in a preset range, creating a wind field frequency modulation power model, a wind turbine generator set frequency modulation power model and an energy storage system frequency modulation power model;
inputting rated frequency of an electric power system, phase-locked loop frequency, sagging control coefficient of a central controller, change rate of system frequency, virtual inertia coefficient of the central controller and rated power of a wind turbine generator set into a wind field frequency modulation power model to obtain wind field frequency modulation power;
inputting rated frequency of an electric power system, phase-locked loop frequency, sagging control coefficient of a virtual synchronous machine of the wind turbine, change rate of system frequency, virtual inertia coefficient of the virtual synchronous machine of the wind turbine and rated power of the wind turbine into a frequency modulation power model of the wind turbine, and obtaining frequency modulation power of the wind turbine;
inputting wind field frequency modulation power, wind turbine generator frequency modulation power and a power instruction value into an energy storage system frequency modulation power model to obtain energy storage system frequency modulation power;
and uniformly distributing the frequency modulation power of the wind turbine generator to a plurality of wind turbine generator virtual synchronous machines, and uniformly distributing the frequency modulation power of the energy storage system to a plurality of energy storage systems.
In one embodiment, the wind farm frequency modulated power is obtained by a wind farm frequency modulated power model as follows:
wherein P is f For wind field frequency modulation power, f N For the rated frequency of the power system, f pll For the phase-locked loop frequency, K f Is a sagging control coefficient of the central controller,t is the rate of change of the system frequency j Virtual inertia coefficient for central controller, P N The rated power of the wind turbine generator is obtained.
In one embodiment, the wind turbine frequency modulation power is obtained by a wind turbine frequency modulation power model as follows:
wherein P is wf Frequency modulation power f for wind turbine generator N For the rated frequency of the power system, f pll For the phase-locked loop frequency, K wf Is a sagging control coefficient of the virtual synchronous machine of the wind turbine,t is the rate of change of the system frequency wj Virtual inertia coefficient, P of virtual synchronous machine of wind turbine generator N The rated power of the wind turbine generator is obtained.
In one embodiment, the energy storage system frequency modulated power is obtained by an energy storage system frequency modulated power model:
P bf ＝P f -P wf +P bref ；
wherein P is bf Frequency modulation power for energy storage system, P f For wind field frequency modulation power, P wf Frequency modulation power for wind turbine generator system, P bref Is a power command value.
The embodiment of the invention also provides a wind-storage coordination frequency modulation system based on the virtual synchronous machine, which comprises the following steps:
the judging unit is used for judging whether the phase-locked loop frequency is in a preset range or not;
the model creation unit is used for creating a wind field frequency modulation power model, a wind turbine frequency modulation power model and an energy storage system frequency modulation power model;
the wind field frequency modulation power unit is used for inputting the rated frequency of the power system, the frequency of the phase-locked loop, the sagging control coefficient of the central controller, the change rate of the system frequency, the virtual inertia coefficient of the central controller and the rated power of the wind motor set into a wind field frequency modulation power model to obtain wind field frequency modulation power;
the wind turbine generator frequency modulation power unit is used for inputting the rated frequency of the power system, the frequency of the phase-locked loop, the sagging control coefficient of the virtual synchronous machine of the wind turbine generator, the change rate of the system frequency, the virtual inertia coefficient of the virtual synchronous machine of the wind turbine generator and the rated power of the wind turbine generator into the wind turbine generator frequency modulation power model to obtain the wind turbine generator frequency modulation power;
the energy storage system frequency modulation power unit is used for inputting wind field frequency modulation power, wind turbine generator frequency modulation power and power instruction values into the energy storage system frequency modulation power model to obtain energy storage system frequency modulation power;
and the distribution unit is used for distributing the frequency modulation power of the wind turbine generator to the plurality of wind turbine generator virtual synchronous machines evenly and distributing the frequency modulation power of the energy storage system to the plurality of energy storage systems evenly.
In one embodiment, the wind farm frequency modulated power is obtained by a wind farm frequency modulated power model as follows:
wherein P is f For wind field frequency modulation power, f N For the rated frequency of the power system, f pll For the phase-locked loop frequency, K f Is a sagging control coefficient of the central controller,t is the rate of change of the system frequency j Virtual inertia coefficient for central controller, P N The rated power of the wind turbine generator is obtained.
In one embodiment, the wind turbine frequency modulation power is obtained by a wind turbine frequency modulation power model as follows:
wherein P is wf Frequency modulation power f for wind turbine generator N For the rated frequency of the power system, f pll For the phase-locked loop frequency, K wf Is a sagging control coefficient of the virtual synchronous machine of the wind turbine,t is the rate of change of the system frequency wj Virtual inertia coefficient, P of virtual synchronous machine of wind turbine generator N Is a wind turbine generator systemRated power.
In one embodiment, the energy storage system frequency modulated power is obtained by an energy storage system frequency modulated power model:
P bf ＝P f -P wf +P bref ；
wherein P is bf Frequency modulation power for energy storage system, P f For wind field frequency modulation power, P wf Frequency modulation power for wind turbine generator system, P bref Is a power command value.
The embodiment of the invention also provides a computer device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the following steps when executing the computer program:
judging whether the phase-locked loop frequency is in a preset range or not;
when the frequency of the phase-locked loop is not in a preset range, creating a wind field frequency modulation power model, a wind turbine generator set frequency modulation power model and an energy storage system frequency modulation power model;
inputting rated frequency of an electric power system, phase-locked loop frequency, sagging control coefficient of a central controller, change rate of system frequency, virtual inertia coefficient of the central controller and rated power of a wind turbine generator set into a wind field frequency modulation power model to obtain wind field frequency modulation power;
inputting rated frequency of an electric power system, phase-locked loop frequency, sagging control coefficient of a virtual synchronous machine of the wind turbine, change rate of system frequency, virtual inertia coefficient of the virtual synchronous machine of the wind turbine and rated power of the wind turbine into a frequency modulation power model of the wind turbine, and obtaining frequency modulation power of the wind turbine;
inputting wind field frequency modulation power, wind turbine generator frequency modulation power and a power instruction value into an energy storage system frequency modulation power model to obtain energy storage system frequency modulation power;
and uniformly distributing the frequency modulation power of the wind turbine generator to a plurality of wind turbine generator virtual synchronous machines, and uniformly distributing the frequency modulation power of the energy storage system to a plurality of energy storage systems.
The embodiment of the invention also provides a computer readable storage medium, on which a computer program is stored, which when being executed by a processor, realizes the following steps:
judging whether the phase-locked loop frequency is in a preset range or not;
when the frequency of the phase-locked loop is not in a preset range, creating a wind field frequency modulation power model, a wind turbine generator set frequency modulation power model and an energy storage system frequency modulation power model;
inputting rated frequency of an electric power system, phase-locked loop frequency, sagging control coefficient of a central controller, change rate of system frequency, virtual inertia coefficient of the central controller and rated power of a wind turbine generator set into a wind field frequency modulation power model to obtain wind field frequency modulation power;
inputting rated frequency of an electric power system, phase-locked loop frequency, sagging control coefficient of a virtual synchronous machine of the wind turbine, change rate of system frequency, virtual inertia coefficient of the virtual synchronous machine of the wind turbine and rated power of the wind turbine into a frequency modulation power model of the wind turbine, and obtaining frequency modulation power of the wind turbine;
inputting wind field frequency modulation power, wind turbine generator frequency modulation power and a power instruction value into an energy storage system frequency modulation power model to obtain energy storage system frequency modulation power;
and uniformly distributing the frequency modulation power of the wind turbine generator to a plurality of wind turbine generator virtual synchronous machines, and uniformly distributing the frequency modulation power of the energy storage system to a plurality of energy storage systems.
According to the wind-storage coordination frequency modulation method and system based on the virtual synchronous machine, whether the frequency of the phase-locked loop is in a preset range is judged; when the frequency of the phase-locked loop is not in a preset range, creating a wind field frequency modulation power model, a wind turbine generator set frequency modulation power model and an energy storage system frequency modulation power model; then inputting the rated frequency of the power system, the frequency of the phase-locked loop, the sagging control coefficient of the central controller, the change rate of the system frequency, the virtual inertia coefficient of the central controller and the rated power of the wind turbine generator system into a wind field frequency modulation power model to obtain wind field frequency modulation power; inputting rated frequency of an electric power system, phase-locked loop frequency, sagging control coefficient of a virtual synchronous machine of the wind turbine, change rate of system frequency, virtual inertia coefficient of the virtual synchronous machine of the wind turbine and rated power of the wind turbine into a frequency modulation power model of the wind turbine, and obtaining frequency modulation power of the wind turbine; inputting wind field frequency modulation power, wind turbine generator frequency modulation power and a power instruction value into an energy storage system frequency modulation power model to obtain energy storage system frequency modulation power; and finally, uniformly distributing the frequency modulation power of the wind turbine generators to a plurality of wind turbine generator virtual synchronous machines, uniformly distributing the frequency modulation power of the energy storage system to a plurality of energy storage systems, and timely adjusting the frequency of the power system, so that the secondary drop of the frequency of the wind turbine generators is avoided, the frequency characteristic of the new energy high-permeability power system is greatly improved, and the energy storage investment cost is saved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a wind-storage coordination frequency modulation method based on a virtual synchronous machine in an embodiment of the invention;
FIG. 2 is a graph showing the comparison of the PLL frequency of wind-storage coordination based on a virtual synchronous machine and the PLL frequency of direct compensation of secondary frequency drop by energy storage in an embodiment of the present invention;
FIG. 3 is a graph comparing active power of an energy storage system based on wind storage coordination of a virtual synchronous machine with active power of an energy storage system for directly compensating for secondary frequency drop in an embodiment of the invention;
FIG. 4 is a comparative table of power shortage based on wind-reservoir coordination of a virtual synchronous machine and direct compensation of secondary frequency dip by stored energy in an embodiment of the present invention;
fig. 5 is a block diagram of a wind-storage coordination frequency modulation system based on a virtual synchronous machine in an embodiment of the invention.
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.
In view of the fact that the frequency of a power system cannot be timely adjusted by the existing wind storage coordination frequency adjustment method, secondary drop of the frequency of a wind turbine generator is caused, and excessive energy storage capacity is consumed, the wind storage coordination frequency adjustment method based on the virtual synchronous machine can timely adjust the frequency of the power system, avoid the secondary drop of the frequency of the wind turbine generator, greatly improve the frequency characteristic of a new energy high-permeability power system, and save energy storage investment cost. The present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a flow chart of a wind-storage coordination frequency modulation method based on a virtual synchronous machine. As shown in fig. 1, the wind-storage coordination frequency modulation method based on the virtual synchronous machine comprises the following steps:
s101: and judging whether the phase-locked loop frequency is in a preset range or not.
S102: when the frequency of the phase-locked loop is not in a preset range, a wind field frequency modulation power model, a wind turbine generator set frequency modulation power model and an energy storage system frequency modulation power model are created.
S103: and inputting the rated frequency of the power system, the frequency of the phase-locked loop, the sagging control coefficient of the central controller, the change rate of the system frequency, the virtual inertia coefficient of the central controller and the rated power of the wind turbine generator system into a wind field frequency modulation power model to obtain wind field frequency modulation power.
S104: and inputting rated frequency of the power system, frequency of the phase-locked loop, sagging control coefficient of the virtual synchronous machine of the wind turbine, change rate of system frequency, virtual inertia coefficient of the virtual synchronous machine of the wind turbine and rated power of the wind turbine into a frequency modulation power model of the wind turbine, and obtaining frequency modulation power of the wind turbine.
S105: and inputting wind field frequency modulation power, wind turbine generator frequency modulation power and a power instruction value into an energy storage system frequency modulation power model to obtain energy storage system frequency modulation power.
S106: and uniformly distributing the frequency modulation power of the wind turbine generator to a plurality of wind turbine generator virtual synchronous machines, and uniformly distributing the frequency modulation power of the energy storage system to a plurality of energy storage systems.
The wind-storage coordination frequency modulation method based on the virtual synchronous machine shown in fig. 1 can be applied to a central controller of the virtual synchronous machine. As can be seen from the flow shown in fig. 1, the present invention firstly determines whether the phase-locked loop frequency is within a preset range; when the frequency of the phase-locked loop is not in a preset range, creating a wind field frequency modulation power model, a wind turbine generator set frequency modulation power model and an energy storage system frequency modulation power model; then inputting the rated frequency of the power system, the frequency of the phase-locked loop, the sagging control coefficient of the central controller, the change rate of the system frequency, the virtual inertia coefficient of the central controller and the rated power of the wind turbine generator system into a wind field frequency modulation power model to obtain wind field frequency modulation power; inputting rated frequency of an electric power system, phase-locked loop frequency, sagging control coefficient of a virtual synchronous machine of the wind turbine, change rate of system frequency, virtual inertia coefficient of the virtual synchronous machine of the wind turbine and rated power of the wind turbine into a frequency modulation power model of the wind turbine, and obtaining frequency modulation power of the wind turbine; inputting wind field frequency modulation power, wind turbine generator frequency modulation power and a power instruction value into an energy storage system frequency modulation power model to obtain energy storage system frequency modulation power; and finally, uniformly distributing the frequency modulation power of the wind turbine generators to a plurality of wind turbine generator virtual synchronous machines, uniformly distributing the frequency modulation power of the energy storage system to a plurality of energy storage systems, and timely adjusting the frequency of the power system, so that the secondary drop of the frequency of the wind turbine generators is avoided, the frequency characteristic of the new energy high-permeability power system is greatly improved, and the energy storage investment cost is saved.
The preset range of the phase-locked loop frequency is as follows: greater than or equal to 49.97Hz and less than or equal to 50.03Hz. When the phase-locked loop frequency is in a preset range, the power command value is equally distributed to a plurality of energy storage systems.
In one embodiment, S103 specifically includes: obtaining wind field frequency modulation power through the following wind field frequency modulation power model:
wherein P is f For wind field frequency modulation power, f N For the rated frequency of the power system, f pll For the phase-locked loop frequency, K f Is a sagging control coefficient of the central controller,t is the rate of change of the system frequency j Virtual inertia coefficient for central controller, P N The rated power of the wind turbine generator is obtained. In specific implementation, the sagging control coefficient K of the central controller f The optimal value of (2) is 20, and the virtual inertia coefficient T of the central controller j Is 5.
In one embodiment, S104 specifically includes: obtaining the frequency modulation power of the wind turbine through a frequency modulation power model of the wind turbine as follows:
wherein P is wf Frequency modulation power f for wind turbine generator N For the rated frequency of the power system, f pll For the phase-locked loop frequency, K wf Is a sagging control coefficient of the virtual synchronous machine of the wind turbine,t is the rate of change of the system frequency wj Virtual inertia coefficient, P of virtual synchronous machine of wind turbine generator N The rated power of the wind turbine generator is obtained. In specific implementation, the droop control coefficient K of the virtual synchronous machine of the wind turbine generator system wf The optimal value of (2) is 5, and the virtual inertia coefficient T of the virtual synchronous machine of the wind turbine generator set wj Is 12.
In one embodiment, S105 specifically includes: obtaining the frequency modulation power of the energy storage system through the following frequency modulation power model of the energy storage system:
P bf ＝P f -P wf +P bref ；
wherein P is bf Frequency modulation power for energy storage system, P f For wind field frequency modulation power, P wf Frequency modulation power for wind turbine generator system, P bref Is a power command value.
FIG. 2 is the presentIn the embodiment of the invention, the phase-locked loop frequency based on wind-storage coordination of the virtual synchronous machine is compared with the phase-locked loop frequency of which the energy storage directly compensates the secondary frequency drop. As shown in fig. 2, the horizontal axis is time in seconds(s); the vertical axis is the phase-locked loop frequency f pll In hertz (Hz). Curve a is the phase-locked loop frequency for directly compensating the secondary frequency drop, and curve b is the phase-locked loop frequency for wind-storage coordination based on the virtual synchronous machine. As shown in fig. 2, in an environment where a load disturbance of 2% of system capacity is applied in a grid with a wind installation ratio of 20%, the phase-locked loop frequency based on wind storage coordination of the virtual synchronous machine is substantially identical to the phase-locked loop frequency directly compensating for the secondary frequency drop. The minimum frequency of the two phase-locked loop frequencies is 49.914Hz, and the steady frequency is 49.936Hz.
Fig. 3 is a graph comparing active power of an energy storage system based on wind storage coordination of a virtual synchronous machine with active power of an energy storage system for directly compensating for secondary frequency drop in an embodiment of the invention. As shown in fig. 3, the horizontal axis is time in seconds(s); the vertical axis is active power in watts (W). Curve a is the active power of the energy storage system for directly compensating the secondary frequency drop, and curve b is the active power of the energy storage system for wind storage coordination based on the virtual synchronous machine. As shown in fig. 3, under the working conditions of different wind speeds, the active power of the energy storage system based on the wind storage coordination of the virtual synchronous machine is obviously smaller than that of the energy storage system for directly compensating the secondary frequency drop.
FIG. 4 is a comparison table of power shortage and energy storage based on wind-storage coordination of a virtual synchronous machine for directly compensating secondary frequency drop in an embodiment of the present invention. As shown in fig. 4, compared with the frequency modulation mode in which the energy storage directly compensates for the secondary frequency drop, the wind storage coordination based on the virtual synchronous machine in the embodiment of the invention has obviously reduced power shortage. When the wind speed is 6.2m/s, the power shortage of the secondary frequency drop is 2.9% and the power shortage of the wind storage coordination based on the virtual synchronous machine is 2.8%. When the wind speed is 8.6m/s, the power shortage of the secondary frequency drop is directly compensated by the energy storage and is 4.8%, and the power shortage of wind storage coordination based on the virtual synchronous machine is 4.2%. When the wind speed is 11.2m/s, the power shortage of the secondary frequency drop is 5.9% and the power shortage of the wind storage coordination based on the virtual synchronous machine is 3.7%. Therefore, the energy storage is directly compensated for the energy storage with the maximum power shortage required by 5.9% of wind field capacity due to the secondary frequency drop, and the energy storage with the maximum power shortage required by 4.2% of wind field capacity due to the wind storage coordination of the virtual synchronous machine is configured.
In summary, the wind storage coordination frequency modulation method based on the virtual synchronous machine disclosed by the embodiment of the invention distributes the frequency modulation power of the wind turbine to the virtual synchronous machine of the wind turbine, distributes the frequency modulation power of the energy storage system to the energy storage system, can fully utilize the rotor inertia of the wind turbine in the primary frequency modulation process, simultaneously controls the optimal values of various coefficients through the virtual synchronous function of the wind turbine, avoids the wind turbine to completely bear the support power in the primary frequency modulation initial stage, timely adjusts the frequency of the power system, avoids the secondary drop of the frequency of the wind turbine, greatly improves the frequency characteristic of the new energy high-permeability power system, and saves the energy storage investment cost.
Based on the same inventive concept, the embodiment of the invention also provides a wind-storage coordination frequency modulation system based on the virtual synchronous machine, and because the principle of solving the problem of the system is similar to that of the wind-storage coordination frequency modulation method based on the virtual synchronous machine, the implementation of the system can be referred to the implementation of the method, and the repetition is omitted.
Fig. 5 is a block diagram of a wind-storage coordination frequency modulation system based on a virtual synchronous machine in an embodiment of the invention. As shown in fig. 5, the wind-storage coordination frequency modulation system based on the virtual synchronous machine comprises:
the judging unit is used for judging whether the phase-locked loop frequency is in a preset range or not;
the model creation unit is used for creating a wind field frequency modulation power model, a wind turbine frequency modulation power model and an energy storage system frequency modulation power model;
the wind field frequency modulation power unit is used for inputting the rated frequency of the power system, the frequency of the phase-locked loop, the sagging control coefficient of the central controller, the change rate of the system frequency, the virtual inertia coefficient of the central controller and the rated power of the wind motor set into a wind field frequency modulation power model to obtain wind field frequency modulation power;
the wind turbine generator frequency modulation power unit is used for inputting the rated frequency of the power system, the frequency of the phase-locked loop, the sagging control coefficient of the virtual synchronous machine of the wind turbine generator, the change rate of the system frequency, the virtual inertia coefficient of the virtual synchronous machine of the wind turbine generator and the rated power of the wind turbine generator into the wind turbine generator frequency modulation power model to obtain the wind turbine generator frequency modulation power;
the energy storage system frequency modulation power unit is used for inputting wind field frequency modulation power, wind turbine generator frequency modulation power and power instruction values into the energy storage system frequency modulation power model to obtain energy storage system frequency modulation power;
and the distribution unit is used for distributing the frequency modulation power of the wind turbine generator to the plurality of wind turbine generator virtual synchronous machines evenly and distributing the frequency modulation power of the energy storage system to the plurality of energy storage systems evenly.
In one embodiment, the wind farm frequency modulated power is obtained by a wind farm frequency modulated power model as follows:
wherein P is f For wind field frequency modulation power, f N For the rated frequency of the power system, f pll For the phase-locked loop frequency, K f Is a sagging control coefficient of the central controller,t is the rate of change of the system frequency j Virtual inertia coefficient for central controller, P N The rated power of the wind turbine generator is obtained.
In one embodiment, the wind turbine frequency modulation power is obtained by a wind turbine frequency modulation power model as follows:
wherein P is wf Frequency modulation power f for wind turbine generator N Is an electric power systemFrequency of system rating, f pll For the phase-locked loop frequency, K wf Is a sagging control coefficient of the virtual synchronous machine of the wind turbine,t is the rate of change of the system frequency wj Virtual inertia coefficient, P of virtual synchronous machine of wind turbine generator N The rated power of the wind turbine generator is obtained.
In one embodiment, the energy storage system frequency modulated power is obtained by an energy storage system frequency modulated power model:
P bf ＝P f -P wf +P bref ；
wherein P is bf Frequency modulation power for energy storage system, P f For wind field frequency modulation power, P wf Frequency modulation power for wind turbine generator system, P bref Is a power command value.
In summary, the wind storage coordination frequency modulation system based on the virtual synchronous machine disclosed by the embodiment of the invention distributes the frequency modulation power of the wind turbine to the virtual synchronous machine of the wind turbine, distributes the frequency modulation power of the energy storage system to the energy storage system, can fully utilize the rotor inertia of the wind turbine in the primary frequency modulation process, timely adjusts the frequency of the power system, avoids the secondary drop of the frequency of the wind turbine, greatly improves the frequency characteristic of the new energy high-permeability power system, and saves the energy storage investment cost.
The embodiment of the invention also provides a computer device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the following steps when executing the computer program:
judging whether the phase-locked loop frequency is in a preset range or not;
when the frequency of the phase-locked loop is not in a preset range, creating a wind field frequency modulation power model, a wind turbine generator set frequency modulation power model and an energy storage system frequency modulation power model;
inputting rated frequency of an electric power system, phase-locked loop frequency, sagging control coefficient of a central controller, change rate of system frequency, virtual inertia coefficient of the central controller and rated power of a wind turbine generator set into a wind field frequency modulation power model to obtain wind field frequency modulation power;
inputting rated frequency of an electric power system, phase-locked loop frequency, sagging control coefficient of a virtual synchronous machine of the wind turbine, change rate of system frequency, virtual inertia coefficient of the virtual synchronous machine of the wind turbine and rated power of the wind turbine into a frequency modulation power model of the wind turbine, and obtaining frequency modulation power of the wind turbine;
inputting wind field frequency modulation power, wind turbine generator frequency modulation power and a power instruction value into an energy storage system frequency modulation power model to obtain energy storage system frequency modulation power;
and uniformly distributing the frequency modulation power of the wind turbine generator to a plurality of wind turbine generator virtual synchronous machines, and uniformly distributing the frequency modulation power of the energy storage system to a plurality of energy storage systems.
In summary, the computer equipment of the embodiment of the invention distributes the frequency modulation power of the wind turbine to the virtual synchronous machine of the wind turbine, distributes the frequency modulation power of the energy storage system to the energy storage system, can fully utilize the rotor inertia of the wind turbine in the primary frequency modulation process, timely adjust the frequency of the power system, avoid the secondary drop of the frequency of the wind turbine, greatly improve the frequency characteristic of the new energy high-permeability power system and save the energy storage investment cost.
The embodiment of the invention also provides a computer readable storage medium, which stores a computer program, and the computer program realizes the following steps when being executed by a processor:
judging whether the phase-locked loop frequency is in a preset range or not;
when the frequency of the phase-locked loop is not in a preset range, creating a wind field frequency modulation power model, a wind turbine generator set frequency modulation power model and an energy storage system frequency modulation power model;
inputting rated frequency of an electric power system, phase-locked loop frequency, sagging control coefficient of a central controller, change rate of system frequency, virtual inertia coefficient of the central controller and rated power of a wind turbine generator set into a wind field frequency modulation power model to obtain wind field frequency modulation power;
inputting rated frequency of an electric power system, phase-locked loop frequency, sagging control coefficient of a virtual synchronous machine of the wind turbine, change rate of system frequency, virtual inertia coefficient of the virtual synchronous machine of the wind turbine and rated power of the wind turbine into a frequency modulation power model of the wind turbine, and obtaining frequency modulation power of the wind turbine;
inputting wind field frequency modulation power, wind turbine generator frequency modulation power and a power instruction value into an energy storage system frequency modulation power model to obtain energy storage system frequency modulation power;
and uniformly distributing the frequency modulation power of the wind turbine generator to a plurality of wind turbine generator virtual synchronous machines, and uniformly distributing the frequency modulation power of the energy storage system to a plurality of energy storage systems.
In summary, the computer readable storage medium of the embodiment of the invention distributes the frequency modulation power of the wind turbine to the virtual synchronous machine of the wind turbine, distributes the frequency modulation power of the energy storage system to the energy storage system, can fully utilize the rotor inertia of the wind turbine in the primary frequency modulation process, timely adjust the frequency of the power system, avoid the secondary drop of the frequency of the wind turbine, greatly improve the frequency characteristic of the new energy high permeability power system, and save the energy storage investment cost.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (4)
1. A wind-storage coordination frequency modulation method based on a virtual synchronous machine is characterized by comprising the following steps:
judging whether the phase-locked loop frequency is in a preset range or not;
when the frequency of the phase-locked loop is not in a preset range, creating a wind field frequency modulation power model, a wind turbine generator set frequency modulation power model and an energy storage system frequency modulation power model;
inputting rated frequency of an electric power system, phase-locked loop frequency, sagging control coefficient of a central controller, change rate of system frequency, virtual inertia coefficient of the central controller and rated power of a wind turbine generator set into the wind field frequency modulation power model to obtain wind field frequency modulation power;
inputting the rated frequency of the power system, the frequency of the phase-locked loop, the sagging control coefficient of the virtual synchronous machine of the wind turbine, the change rate of the system frequency, the virtual inertia coefficient of the virtual synchronous machine of the wind turbine and the rated power of the wind turbine into the frequency modulation power model of the wind turbine to obtain the frequency modulation power of the wind turbine;
inputting the wind farm frequency modulation power, the wind turbine generator frequency modulation power and a power instruction value into the energy storage system frequency modulation power model to obtain energy storage system frequency modulation power;
the frequency modulation power of the wind turbine generator is evenly distributed to a plurality of wind turbine generator virtual synchronous machines, and the frequency modulation power of the energy storage system is evenly distributed to a plurality of energy storage systems;
obtaining wind field frequency modulation power through the following wind field frequency modulation power model:
wherein P is f For wind field frequency modulation power, f N For the rated frequency of the power system, f pll For the phase-locked loop frequency, K f Is a sagging control coefficient of the central controller,t is the rate of change of the system frequency j Virtual inertia coefficient for central controller, P N Rated power of the wind turbine generator;
obtaining the frequency modulation power of the wind turbine through a frequency modulation power model of the wind turbine as follows:
wherein P is wf Frequency modulation power f for wind turbine generator N For the rated frequency of the power system, f pll For the phase-locked loop frequency, K wf Under virtual synchronous machine of wind turbine generator systemThe control coefficient of the drop is set,t is the rate of change of the system frequency wj Virtual inertia coefficient, P of virtual synchronous machine of wind turbine generator N Rated power of the wind turbine generator;
obtaining the frequency modulation power of the energy storage system through the following frequency modulation power model of the energy storage system:
P bf ＝P f -P wf +P bref ；
wherein P is bf Frequency modulation power for energy storage system, P f For wind field frequency modulation power, P wf Frequency modulation power for wind turbine generator system, P bref Is a power command value.
2. Wind-storage coordination frequency modulation system based on virtual synchronous machine, which is characterized by comprising:
the judging unit is used for judging whether the phase-locked loop frequency is in a preset range or not;
the model creation unit is used for creating a wind field frequency modulation power model, a wind turbine frequency modulation power model and an energy storage system frequency modulation power model;
the wind field frequency modulation power unit is used for inputting the rated frequency of the power system, the frequency of the phase-locked loop, the sagging control coefficient of the central controller, the change rate of the system frequency, the virtual inertia coefficient of the central controller and the rated power of the wind motor set into the wind field frequency modulation power model to obtain wind field frequency modulation power;
the wind turbine generator frequency modulation power unit is used for inputting the rated frequency of the power system, the frequency of the phase-locked loop, the sagging control coefficient of the wind turbine generator virtual synchronous machine, the change rate of the system frequency, the virtual inertia coefficient of the wind turbine generator virtual synchronous machine and the rated power of the wind turbine generator into the wind turbine generator frequency modulation power model to obtain wind turbine generator frequency modulation power;
the energy storage system frequency modulation power unit is used for inputting the wind field frequency modulation power, the wind turbine generator set frequency modulation power and the power instruction value into the energy storage system frequency modulation power model to obtain energy storage system frequency modulation power;
the distribution unit is used for distributing the frequency modulation power of the wind turbine generator to a plurality of wind turbine generator virtual synchronous machines in an average manner and distributing the frequency modulation power of the energy storage system to a plurality of energy storage systems in an average manner;
obtaining wind field frequency modulation power through the following wind field frequency modulation power model:
wherein P is f For wind field frequency modulation power, f N For the rated frequency of the power system, f pll For the phase-locked loop frequency, K f Is a sagging control coefficient of the central controller,t is the rate of change of the system frequency j Virtual inertia coefficient for central controller, P N Rated power of the wind turbine generator;
obtaining the frequency modulation power of the wind turbine through a frequency modulation power model of the wind turbine as follows:
wherein P is wf Frequency modulation power f for wind turbine generator N For the rated frequency of the power system, f pll For the phase-locked loop frequency, K wf Is a sagging control coefficient of the virtual synchronous machine of the wind turbine,t is the rate of change of the system frequency wj Virtual inertia coefficient, P of virtual synchronous machine of wind turbine generator N Rated power of the wind turbine generator;
obtaining the frequency modulation power of the energy storage system through the following frequency modulation power model of the energy storage system:
P bf ＝P f -P wf +P bref ；
wherein P is bf Frequency modulation power for energy storage system, P f For wind field frequency modulation power, P wf Frequency modulation power for wind turbine generator system, P bref Is a power command value.
3. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the following steps when executing the computer program:
judging whether the phase-locked loop frequency is in a preset range or not;
when the frequency of the phase-locked loop is not in a preset range, creating a wind field frequency modulation power model, a wind turbine generator set frequency modulation power model and an energy storage system frequency modulation power model;
inputting rated frequency of an electric power system, phase-locked loop frequency, sagging control coefficient of a central controller, change rate of system frequency, virtual inertia coefficient of the central controller and rated power of a wind turbine generator set into the wind field frequency modulation power model to obtain wind field frequency modulation power;
inputting the rated frequency of the power system, the frequency of the phase-locked loop, the sagging control coefficient of the virtual synchronous machine of the wind turbine, the change rate of the system frequency, the virtual inertia coefficient of the virtual synchronous machine of the wind turbine and the rated power of the wind turbine into the frequency modulation power model of the wind turbine to obtain the frequency modulation power of the wind turbine;
inputting the wind farm frequency modulation power, the wind turbine generator frequency modulation power and a power instruction value into the energy storage system frequency modulation power model to obtain energy storage system frequency modulation power;
the frequency modulation power of the wind turbine generator is evenly distributed to a plurality of wind turbine generator virtual synchronous machines, and the frequency modulation power of the energy storage system is evenly distributed to a plurality of energy storage systems;
obtaining wind field frequency modulation power through the following wind field frequency modulation power model:
wherein P is f For wind field frequency modulation power, f N For the rated frequency of the power system, f pll For the phase-locked loop frequency, K f Is a sagging control coefficient of the central controller,t is the rate of change of the system frequency j Virtual inertia coefficient for central controller, P N Rated power of the wind turbine generator;
obtaining the frequency modulation power of the wind turbine through a frequency modulation power model of the wind turbine as follows:
wherein P is wf Frequency modulation power f for wind turbine generator N For the rated frequency of the power system, f pll For the phase-locked loop frequency, K wf Is a sagging control coefficient of the virtual synchronous machine of the wind turbine,t is the rate of change of the system frequency wj Virtual inertia coefficient, P of virtual synchronous machine of wind turbine generator N Rated power of the wind turbine generator;
obtaining the frequency modulation power of the energy storage system through the following frequency modulation power model of the energy storage system:
P bf ＝P f -P wf +P bref ；
wherein P is bf Frequency modulation power for energy storage system, P f For wind field frequency modulation power, P wf Frequency modulation power for wind turbine generator system, P bref Is a power command value.
4. A computer readable storage medium having stored thereon a computer program, characterized in that the computer program when executed by a processor realizes the steps of:
judging whether the phase-locked loop frequency is in a preset range or not;
when the frequency of the phase-locked loop is not in a preset range, creating a wind field frequency modulation power model, a wind turbine generator set frequency modulation power model and an energy storage system frequency modulation power model;
inputting rated frequency of an electric power system, phase-locked loop frequency, sagging control coefficient of a central controller, change rate of system frequency, virtual inertia coefficient of the central controller and rated power of a wind turbine generator set into the wind field frequency modulation power model to obtain wind field frequency modulation power;
inputting the rated frequency of the power system, the frequency of the phase-locked loop, the sagging control coefficient of the virtual synchronous machine of the wind turbine, the change rate of the system frequency, the virtual inertia coefficient of the virtual synchronous machine of the wind turbine and the rated power of the wind turbine into the frequency modulation power model of the wind turbine to obtain the frequency modulation power of the wind turbine;
inputting the wind farm frequency modulation power, the wind turbine generator frequency modulation power and a power instruction value into the energy storage system frequency modulation power model to obtain energy storage system frequency modulation power;
the frequency modulation power of the wind turbine generator is evenly distributed to a plurality of wind turbine generator virtual synchronous machines, and the frequency modulation power of the energy storage system is evenly distributed to a plurality of energy storage systems;
obtaining wind field frequency modulation power through the following wind field frequency modulation power model:
wherein P is f For wind field frequency modulation power, f N For the rated frequency of the power system, f pll For the phase-locked loop frequency, K f Is a sagging control coefficient of the central controller,t is the rate of change of the system frequency j Virtual inertia coefficient for central controller, P N Rated power of the wind turbine generator;
obtaining the frequency modulation power of the wind turbine through a frequency modulation power model of the wind turbine as follows:
wherein P is wf Frequency modulation power f for wind turbine generator N For the rated frequency of the power system, f pll For the phase-locked loop frequency, K wf Is a sagging control coefficient of the virtual synchronous machine of the wind turbine,t is the rate of change of the system frequency wj Virtual inertia coefficient, P of virtual synchronous machine of wind turbine generator N Rated power of the wind turbine generator;
obtaining the frequency modulation power of the energy storage system through the following frequency modulation power model of the energy storage system:
P bf ＝P f -P wf +P bref ；
wherein P is bf Frequency modulation power for energy storage system, P f For wind field frequency modulation power, P wf Frequency modulation power for wind turbine generator system, P bref Is a power command value.
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| CN112600226B (en) * | 2020-11-24 | 2023-01-24 | 国网河北省电力有限公司电力科学研究院 | Configuration method, device, equipment and storage medium for energy storage capacity of new energy station |
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