CN116054266B - Frequency modulation and peak shaving system and method for controllable energy storage power station combined thermal power unit - Google Patents
Frequency modulation and peak shaving system and method for controllable energy storage power station combined thermal power unit Download PDFInfo
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- CN116054266B CN116054266B CN202310334692.2A CN202310334692A CN116054266B CN 116054266 B CN116054266 B CN 116054266B CN 202310334692 A CN202310334692 A CN 202310334692A CN 116054266 B CN116054266 B CN 116054266B
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- 238000004146 energy storage Methods 0.000 title claims abstract description 256
- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000009466 transformation Effects 0.000 claims abstract description 25
- 238000010248 power generation Methods 0.000 claims abstract description 13
- 230000008569 process Effects 0.000 claims abstract description 10
- 238000007665 sagging Methods 0.000 claims abstract description 9
- 230000003044 adaptive effect Effects 0.000 claims abstract description 8
- 238000007599 discharging Methods 0.000 claims abstract description 6
- 230000005611 electricity Effects 0.000 claims abstract description 6
- 239000003990 capacitor Substances 0.000 claims description 7
- 239000004973 liquid crystal related substance Substances 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 238000004590 computer program Methods 0.000 claims description 3
- 238000009499 grossing Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
- 230000001131 transforming effect Effects 0.000 description 5
- 230000004044 response Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000006855 networking Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
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Classifications
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
Abstract
The application provides a controllable energy storage power station united thermal power generating unit frequency modulation peak shaving system and method, wherein the system comprises: the system comprises a power generation transformation unit, a control unit and a controllable energy storage power station unit of the thermal power generating unit; the controllable energy storage power station unit is respectively connected with the control unit and the thermal power generating unit and transformation unit; the thermal power generating unit power generating transformation unit comprises: a generator for generating electricity, maintaining the grid system operating at a first power; the control unit is used for controlling the sagging of the controllable energy storage power station unit based on the power required to be output by the controllable energy storage power station unit and the adaptive sagging coefficient; and the controllable energy storage power station unit is used for charging and discharging based on the sagging control and participating in frequency modulation and peak shaving of the power grid system. According to the technical scheme, the frequency modulation and peak regulation performance of the thermal power generating unit is improved, and meanwhile, the fluctuation of direct current voltage in the frequency modulation and peak regulation process is reduced.
Description
Technical Field
The application relates to the field of frequency modulation and peak shaving, in particular to a frequency modulation and peak shaving system and method for a controllable energy storage power station combined thermal power unit.
Background
At present, in an electric power system, an energy storage technology plays a great role in the fields of source, network, load, use and the like. By developing the construction of the energy storage demonstration power station, the stability of renewable energy output can be increased, and the power quality can be improved; the energy storage system has high response speed, can provide quick and timely power response under the condition of the conventional power failure of the power grid, and ensures the power utilization reliability of users. The construction of the energy storage power station is not only beneficial to improving the regional power transmission capacity and the safety stability, but also can increase the low-voltage and high-voltage ride-through capacity of the photovoltaic and wind power through the active reactive power adjustment of energy storage, and improves the reactive power adjustment capacity. The energy storage power station is combined with the thermal power unit, so that the frequency modulation and peak regulation performance of the thermal power unit can be improved.
In addition, the modular multilevel converter (Modular Multilevel Converter, MMC) is widely used in a converter system due to good expansibility and output characteristics, compared with a traditional converter, the MMC not only effectively reduces voltage drop on a switching device and solves the problem of series voltage equalizing, but also has the characteristic of multi-level voltage regulation, and has the advantages of low requirements of MMC on power electronic devices, simple networking mode and strong expansibility. Although the energy storage power station in the prior art already has an energy storage type modularized multi-level converter using MMC, the frequency modulation and peak shaving performance of the prior art is lower, and the fluctuation of direct current voltage in the frequency modulation and peak shaving process cannot be restrained.
Disclosure of Invention
The application provides a frequency modulation and peak shaving system and method for a controllable energy storage power station combined thermal power generating unit, which are used for at least solving the technical problems that frequency modulation and peak shaving performance are low and fluctuation of direct current voltage in the frequency modulation and peak shaving process cannot be restrained.
An embodiment of a first aspect of the present application provides a controllable energy storage power station and thermal power unit combined frequency modulation peak shaving system, including: the system comprises a power generation transformation unit, a control unit and a controllable energy storage power station unit of the thermal power generating unit;
the controllable energy storage power station unit is respectively connected with the control unit and the thermal power generating unit and transformation unit;
the thermal power generating unit power generating transformation unit comprises: a generator for generating electricity, maintaining the grid system operating at a first power;
the control unit is used for acquiring a frequency modulation and peak shaving instruction when the power grid system needs frequency modulation and peak shaving, determining the power required to be output by the controllable energy storage power station unit and the self-adaptive droop coefficient based on the frequency modulation and peak shaving instruction, and performing droop control on the controllable energy storage power station unit based on the power required to be output by the controllable energy storage power station unit and the self-adaptive droop coefficient;
and the controllable energy storage power station unit is used for charging and discharging based on the sagging control and participating in frequency modulation and peak shaving of the power grid system.
Preferably, the controllable energy storage power station unit is further used for providing electric energy for load equipment connected with the thermal power generating and transforming unit of the thermal power generating unit when the thermal power generating and transforming unit of the thermal power generating unit fails.
Preferably, the generating transformation unit of the thermal power generating unit further comprises: the generator main transformer and the thermal power double-split start-up transformer;
the generator is connected to a power grid system through the generator main transformer, wherein the generated energy of the generator is transmitted to the power grid system through the generator main transformer;
the high-voltage side of the thermal power double-split start-up transformer is connected with a power grid system, and the low-voltage side of the thermal power double-split start-up transformer is connected with the controllable energy storage power station unit;
the low-voltage side of the thermal power double-split start-up transformer comprises: a branch and a B branch.
Further, the controllable energy storage power station unit comprises: the system comprises a set A of controllable energy storage grid-connected circuit breaker, a set A of controllable energy storage power station unit, a set B of controllable energy storage grid-connected circuit breaker and a set B of controllable energy storage power station unit;
the A set of controllable energy storage power station unit is connected to an A branch of the low-voltage side of the thermal power double-split starting and standby transformer through the A set of controllable energy storage grid-connected circuit breaker;
and the B set of controllable energy storage power station unit is connected into the B branch of the low-voltage side of the thermal power double-split starting and standby transformer through the B set of controllable energy storage grid-connected circuit breaker.
Further, the set a of controllable energy storage power station units and the set B of controllable energy storage power station units each include: the system comprises an A-phase controllable energy storage MMC module, a B-phase controllable energy storage MMC module and a C-phase controllable energy storage MMC module.
Further, the controllable energy storage MMC module of A phase, the controllable energy storage MMC module of B phase and the controllable energy storage MMC module of C phase all include: the controllable energy storage MMC upper bridge arm, the controllable energy storage MMC lower bridge arm, the MMC upper bridge arm filter inductor and the MMC lower bridge arm filter inductor;
the controllable energy storage MMC upper bridge arm is connected with the MMC upper bridge arm filter inductor;
the lower bridge arm of the controllable energy storage MMC is connected with the filter inductor of the lower bridge arm of the MMC;
and the MMC upper bridge arm filter inductor is connected with the MMC lower bridge arm filter inductor.
Further, the controllable energy storage MMC upper bridge arm and the controllable energy storage MMC lower bridge arm both comprise: a plurality of controllable energy storage MMC sub-modules and a plurality of distributed energy storage devices;
the distributed energy storage device is connected in parallel to the direct current side of the controllable energy storage MMC sub-module.
Further, the controllable energy storage MMC submodule comprises: MMC submodule direct current side filter capacitor, MMC submodule upper bridge arm and MMC submodule lower bridge arm;
the upper bridge arm of the MMC submodule is connected with the lower bridge arm of the MMC submodule and is connected with the direct-current side filter capacitor of the MMC submodule in parallel.
An embodiment of a second aspect of the present application provides a frequency modulation and peak shaving method for a controllable energy storage power station combined thermal power generating unit, where the method includes:
acquiring a frequency modulation peak shaving instruction, and acquiring target power based on the frequency modulation peak shaving instruction;
acquiring a direct current voltage actual value, a direct current voltage target value, an active power actual value, an active power target value and a charge state of each distributed energy storage device of each phase bridge arm of a controllable energy storage power station unit;
obtaining a self-adaptive droop coefficient based on the actual value of each phase of direct current voltage, the target value of the direct current voltage, the actual value of active power, the target value of active power and the state of charge of each distributed energy storage device of the controllable energy storage power station unit, and further obtaining a modulation signal of each bridge arm;
and performing droop control on the controllable energy storage power station unit based on the modulation signal so that the controllable energy storage power station unit performs frequency modulation and peak shaving according to the target power.
An embodiment of a third aspect of the present application proposes a computer readable storage medium, on which a computer program is stored, which program, when being executed by a processor, implements a method according to an embodiment of the second aspect.
The technical scheme provided by the embodiment of the application at least brings the following beneficial effects:
the application provides a controllable energy storage power station united thermal power unit frequency modulation peak shaving system and a method, wherein the system comprises: the system comprises a power generation transformation unit, a control unit and a controllable energy storage power station unit of the thermal power generating unit; the controllable energy storage power station unit is respectively connected with the control unit and the thermal power generating unit and transformation unit; the thermal power generating unit power generating transformation unit comprises: a generator for generating electricity, maintaining the grid system operating at a first power; the control unit is used for acquiring a frequency modulation and peak shaving instruction when the power grid system needs frequency modulation and peak shaving, determining the power required to be output by the controllable energy storage power station unit and the self-adaptive droop coefficient based on the frequency modulation and peak shaving instruction, and performing droop control on the controllable energy storage power station unit based on the power required to be output by the controllable energy storage power station unit and the self-adaptive droop coefficient; and the controllable energy storage power station unit is used for charging and discharging based on the sagging control and participating in frequency modulation and peak shaving of the power grid system. According to the technical scheme, the frequency modulation and peak regulation performance of the thermal power generating unit is improved, and meanwhile, the fluctuation of direct current voltage in the frequency modulation and peak regulation process is reduced.
Additional aspects and advantages of the application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, wherein:
FIG. 1 is a first block diagram of a controllable energy storage power station and thermal power unit frequency modulation peak shaving system according to an embodiment of the present application;
FIG. 2 is a second block diagram of a controllable energy storage power station and thermal power unit frequency modulation peak shaving system according to an embodiment of the present application;
fig. 3 is a schematic diagram of a connection relationship between a controllable energy storage MMC submodule and a distributed energy storage device according to an embodiment of the present application;
FIG. 4 is a flow chart of a method for frequency modulation and peak shaving of a controllable energy storage power station combined thermal power unit according to an embodiment of the present application;
reference numerals:
the thermal power generating unit power generating transformation unit 1, the control unit 2, the controllable energy storage power station unit 3, the generator 1-1, the generator main transformer 1-2, the thermal power double-split starting transformer 1-3, the branch A1-3-1, the branch B1-3-2, the set A controllable energy storage grid-connected circuit breaker 3-1, the set A controllable energy storage power station unit 3-2, the set B controllable energy storage grid-connected circuit breaker 3-3, the set B controllable energy storage power station unit 3-4, the phase A controllable energy storage MMC module 3-5, the phase B controllable energy storage MMC module 3-6, the phase C controllable energy storage MMC module 3-7, the controllable energy storage MMC upper bridge arm 3-8, the controllable energy storage MMC lower bridge arm 3-9, the MMC upper bridge arm filter inductor 3-10, the MMC lower bridge arm filter inductor 3-11, the controllable energy storage MMC sub-module 3-12, the distributed energy storage device 3-13, the direct current side filter capacitor 3-12-1 of the MMC sub-module, the MMC upper bridge 3-12 and the MMC sub-module lower bridge arm 3-12-3.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and intended for the purpose of explaining the present application and are not to be construed as limiting the present application.
The application provides a controllable energy storage power station unites thermal power unit frequency modulation peak shaving system and method, wherein, the system includes: the system comprises a power generation transformation unit, a control unit and a controllable energy storage power station unit of the thermal power generating unit; the controllable energy storage power station unit is respectively connected with the control unit and the thermal power generating unit and transformation unit; the thermal power generating unit power generating transformation unit comprises: a generator for generating electricity, maintaining the grid system operating at a first power; the control unit is used for acquiring a frequency modulation and peak shaving instruction when the power grid system needs frequency modulation and peak shaving, determining the power required to be output by the controllable energy storage power station unit and the self-adaptive droop coefficient based on the frequency modulation and peak shaving instruction, and performing droop control on the controllable energy storage power station unit based on the power required to be output by the controllable energy storage power station unit and the self-adaptive droop coefficient; and the controllable energy storage power station unit is used for charging and discharging based on the sagging control and participating in frequency modulation and peak shaving of the power grid system. According to the technical scheme, the frequency modulation and peak regulation performance of the thermal power generating unit is improved, and meanwhile, the fluctuation of direct current voltage in the frequency modulation and peak regulation process is reduced.
A frequency modulation and peak shaving system and method for a controllable energy storage power station combined thermal power unit are described below with reference to the accompanying drawings.
Example 1
Fig. 1 is a block diagram of a frequency modulation peak shaving system of a controllable energy storage power station combined thermal power generating unit according to an embodiment of the present application, as shown in fig. 1, including: the system comprises a power generating and transforming unit 1, a control unit 2 and a controllable energy storage power station unit 3 of the thermal power generating unit;
the controllable energy storage power station unit 3 is respectively connected with the control unit 2 and the thermal power generating unit power generating transformation unit 1;
the thermal power generating unit 1 comprises: a generator 1-1, the generator 1-1 being configured to generate electricity, maintaining the grid system operating at a first power; the first power is the power required by the normal operation of the power grid system.
The control unit 2 is configured to obtain a frequency modulation and peak shaving instruction when the grid system needs frequency modulation and peak shaving, determine power and an adaptive droop coefficient required to be output by the controllable energy storage power station unit 3 based on the frequency modulation and peak shaving instruction, and perform droop control on the controllable energy storage power station unit 3 based on the power required to be output by the controllable energy storage power station unit 3 and the adaptive droop coefficient;
the controllable energy storage power station unit 3 is used for charging and discharging based on the sagging control and participating in frequency modulation and peak shaving of a power grid system.
In the embodiment of the present disclosure, the controllable energy storage power station unit 3 is further configured to provide electric energy to a load device connected to the thermal power generating and transforming unit 1 when the thermal power generating and transforming unit 1 fails.
In the embodiment of the present disclosure, as shown in fig. 2, the generating transformer unit 1 of the thermal power generating unit further includes: the main transformer 1-2 and the thermal power double-split start-up transformer 1-3 of the generator;
the generator 1-1 is connected to a power grid system through the generator main transformer 1-2, wherein the generated energy of the generator 1-1 is transmitted to the power grid system through the generator main transformer 1-2; wherein, the generator 1-1 can be a thermal power generating unit;
the high-voltage side of the thermal power double-split starting transformer 1-3 is connected with a power grid system, and the low-voltage side of the thermal power double-split starting transformer 1-3 is connected with the controllable energy storage power station unit 3;
the low-voltage side of the thermal power double-split start-up transformer 1-3 comprises: a branch 1-3-1 and B branch 1-3-2.
In the embodiment of the present disclosure, as shown in fig. 2, the controllable energy storage power station unit 3 includes: the energy storage system comprises a set A of controllable energy storage grid-connected circuit breaker 3-1, a set A of controllable energy storage power station unit 3-2, a set B of controllable energy storage grid-connected circuit breaker 3-3 and a set B of controllable energy storage power station unit 3-4;
the A set of controllable energy storage power station unit 3-2 is connected into the A branch 1-3-1 at the low-voltage side of the thermal power double-split starting standby transformer through the A set of controllable energy storage grid-connected breaker 3-1;
and the B-set controllable energy storage power station unit 3-4 is connected into the B branch 1-3-2 at the low-voltage side of the thermal power double-split starting standby transformer through the B-set controllable energy storage grid-connected breaker 3-3.
It should be noted that the controllable energy storage power station unit 3 is connected to the low-voltage side of the thermal power double-split start-up transformer 1-3 without newly adding voltage boosting transformer equipment, when the thermal power unit normally operates, the start-up transformer is in an empty state, and the controllable energy storage power station unit 3 of the independent energy storage power station can be connected to a power grid system through the thermal power double-split start-up transformer 1-3; the controllable energy storage power station unit 3 is connected into the power grid system through the thermal power double-split start-up transformer 1-3, can independently participate in each adjustment of the power grid system, and can also be used for frequency modulation and peak regulation in combination with the thermal power unit. When the thermal power unit is combined for frequency modulation and peak regulation, the output power of the thermal power unit power generation transformation unit 1 and the output power of the controllable energy storage power station unit 3 are subjected to vector synthesis, the power generation of the generator 1-1 in the thermal power unit power generation transformation unit 1 is maintained to be regulated in normal power, and the controllable energy storage power station unit 3 is subjected to frequency modulation and peak regulation response, so that the frequency modulation and peak regulation performance of the thermal power unit can be improved, and the income is increased.
When the thermal power unit is overhauled, the thermal power double-split starting transformer 1-3 provides electric energy for a thermal power unit plant system corresponding to the thermal power unit power generation transformation unit 1, and the controllable energy storage power station unit 3 and the thermal power unit power generation transformation unit 1 run in parallel.
Further, as shown in fig. 2, the set a of controllable energy storage power station units 3-2 and the set B of controllable energy storage power station units 3-4 each include: the energy storage system comprises an A-phase controllable energy storage MMC module 3-5, a B-phase controllable energy storage MMC module 3-6 and a C-phase controllable energy storage MMC module 3-7.
The A-phase controllable energy storage MMC module 3-5, the B-phase controllable energy storage MMC module 3-6 and the C-phase controllable energy storage MMC module 3-7 all comprise: the energy-saving type multi-stage power supply comprises 3-8 parts of a controllable energy-saving MMC upper bridge arm, 3-9 parts of a controllable energy-saving MMC lower bridge arm, 3-10 parts of an MMC upper bridge arm filter inductor and 3-11 parts of an MMC lower bridge arm filter inductor;
the controllable energy storage MMC upper bridge arm 3-8 is connected with the MMC upper bridge arm filter inductor 3-10;
the lower bridge arm 3-9 of the controllable energy storage MMC is connected with the lower bridge arm filter inductor 3-11 of the MMC;
the MMC upper bridge arm filter inductor 3-10 is connected with the MMC lower bridge arm filter inductor 3-11.
Specifically, as shown in fig. 2, the controllable energy storage MMC upper bridge arm 3-8 and the controllable energy storage MMC lower bridge arm 3-9 each include: a plurality of controllable energy storage MMC submodules 3-12 and a plurality of distributed energy storage devices 3-13;
the distributed energy storage device 3-13 is connected in parallel with the direct current side of the controllable energy storage MMC submodule 3-12;
wherein a plurality of distributed energy storage devices 3-13 in each bridge arm are connected in series.
The distributed energy storage devices 3-13 are adopted for series boosting, so that the voltage can be boosted to 6kV, 400V/6kV boosting change is not needed to be configured, the investment is further saved, the equipment maintenance amount is reduced, the problem of uneven output caused by energy storage in parallel connection is avoided in series boosting, and the circulation problem can be effectively solved.
It should be noted that, as shown in fig. 3, the controllable energy storage MMC submodule 3-12 includes: MMC submodule direct-current side filter capacitor 3-12-1, MMC submodule upper bridge arm 3-12-2 and MMC submodule lower bridge arm 3-12-3;
the MMC submodule upper bridge arm 3-12-2 is connected with the MMC submodule lower bridge arm 3-12-3 and is connected with the MMC submodule direct-current side filter capacitor 3-12-1 in parallel.
Compared with the traditional converter, the MMC converter device is adopted in the controllable energy storage power station unit 3, has good expansibility and output characteristics, effectively reduces voltage drop on a switching device, solves the problem of series voltage equalizing, has the characteristic of multi-level voltage regulation, has low requirements on power electronic devices by MMC, and is simple in networking mode and strong in expansibility.
Meanwhile, the distributed energy storage devices 3-13 are connected in parallel to the direct current side of the single controllable energy storage MMC submodule 3-12, the controllable energy storage power station unit 3 is a controllable distributed energy storage module consisting of n distributed energy storage devices 3-13 and n controllable energy storage MMC submodules 3-12, the hot standby redundancy design concept is adopted in the embodiment, each controllable energy storage MMC upper bridge arm and controllable energy storage MMC lower bridge arm are provided with a plurality of controllable energy storage MMC submodules, when a problem exists in the single controllable energy storage MMC submodule, the operation is cut off, the operation of the whole MMC is not influenced, and the reliability is remarkably improved.
Meanwhile, the embodiment adopts an improved direct-current sagging control strategy, and the voltage adjusting range of the energy storage side is smaller under the same frequency adjusting target, so that the distributed energy storage voltage stability can be maintained, and the voltage fluctuation of the whole energy storage system is controlled within a certain range.
For example, a frequency modulation peak shaving instruction is obtained, and a target power is obtained based on the frequency modulation peak shaving instruction;
acquiring a direct current voltage actual value, a direct current voltage target value, an active power actual value, an active power target value and a charge state of each distributed energy storage device of each phase bridge arm of a controllable energy storage power station unit;
obtaining a self-adaptive droop coefficient based on the actual value of each phase of direct current voltage, the target value of the direct current voltage, the actual value of active power, the target value of active power and the state of charge of each distributed energy storage device of the controllable energy storage power station unit, and further obtaining a modulation signal of each bridge arm;
and performing droop control on the controllable energy storage power station unit based on the modulation signal so that the controllable energy storage power station unit performs frequency modulation and peak shaving according to the target power.
In the embodiment of the disclosure, in order to realize power regulation during frequency modulation and peak shaving, direct-current voltage-power droop control is adopted in each controllable energy storage MMC sub-module, which can be expressed as:
in the method, in the process of the invention,is the firstiPhase 1jActive power target value of each controllable energy storage MMC sub-module,/->Is the firstiPhase 1jActive power actual value of each controllable energy storage MMC sub-module, < ->Is the firstiPhase 1jDirect-current voltage target value of each controllable energy storage MMC sub-module,/->Is the firstiPhase 1jDirect voltage actual value of each controllable energy storage MMC sub-module, < ->Is the firstiPhase 1jSelf-adaption of controllable energy storage MMC sub-moduleSag factor.
Wherein, the liquid crystal display device comprises a liquid crystal display device,wherein->For the magnification factor +.>Is the firstiPhase 1jInitial droop coefficient of each controllable energy storage MMC sub-module,>is the firstiPhase 1jPower regulation of a controllable energy storage MMC sub-module,/->Is the firstiPhase 1jOutput/absorption minimum value of each controllable energy storage MMC sub-module, < >>Is the firstiPhase 1jMaximum power adjustment of the controllable energy storage MMC sub-module,ɑis an adaptive smoothing coefficient;
the first step is thatiPhase 1jThe power adjustment amount of the individual controllable energy storage MMC sub-modules is determined based on the state of charge of the distributed energy storage device.
In summary, the frequency modulation and peak regulation system of the controllable energy storage power station combined thermal power unit provided by the embodiment improves the frequency modulation and peak regulation performance of the thermal power unit, and simultaneously performs droop control based on the self-adaptive droop coefficient, so that the voltage regulation range of the energy storage side is smaller under the same power regulation target, the stability of distributed energy storage voltage can be maintained, and the voltage fluctuation of the whole controllable energy storage power station unit is controlled within a certain range.
Example two
Fig. 4 is a block diagram of a frequency modulation and peak shaving method of a controllable energy storage power station combined thermal power generating unit according to an embodiment of the present application, as shown in fig. 4, where the system includes:
step 1: acquiring a frequency modulation peak shaving instruction, and acquiring target power based on the frequency modulation peak shaving instruction;
step 2: acquiring a direct current voltage actual value, a direct current voltage target value, an active power actual value, an active power target value and a charge state of each distributed energy storage device of each phase bridge arm of a controllable energy storage power station unit;
step 3: obtaining a self-adaptive droop coefficient based on the actual value of each phase of direct current voltage, the target value of the direct current voltage, the actual value of active power, the target value of active power and the state of charge of each distributed energy storage device of the controllable energy storage power station unit, and further obtaining a modulation signal of each bridge arm;
step 4: and performing droop control on the controllable energy storage power station unit based on the modulation signal so that the controllable energy storage power station unit performs frequency modulation and peak shaving according to the target power.
It should be noted that, in order to realize power regulation during frequency modulation and peak shaving, a dc voltage-power droop control is adopted in each controllable energy storage MMC sub-module, which may be expressed as:
in the method, in the process of the invention,is the firstiPhase 1jActive power target value of each controllable energy storage MMC sub-module,/->Is the firstiPhase 1jActive power actual value of each controllable energy storage MMC sub-module, < ->Is the firstiPhase 1jDirect-current voltage target value of each controllable energy storage MMC sub-module,/->Is the firstiPhase 1jStraight of controllable energy storage MMC sub-moduleActual value of the current voltage, ">Is the firstiPhase 1jThe adaptive droop coefficient of the controllable energy storage MMC sub-module.
Wherein, the liquid crystal display device comprises a liquid crystal display device,wherein->For the magnification factor +.>Is the firstiPhase 1jInitial droop coefficient of each controllable energy storage MMC sub-module,>is the firstiPhase 1jPower regulation of a controllable energy storage MMC sub-module,/->Is the firstiPhase 1jOutput/absorption minimum value of each controllable energy storage MMC sub-module, < >>Is the firstiPhase 1jMaximum power adjustment of the controllable energy storage MMC sub-module,ɑis an adaptive smoothing coefficient.
The first step is thatiPhase 1jThe power adjustment amount of the individual controllable energy storage MMC sub-modules is determined based on the state of charge of the distributed energy storage device.
In summary, according to the frequency modulation and peak shaving method for the controllable energy storage power station combined thermal power unit, which is provided by the embodiment, the frequency modulation and peak shaving performance of the thermal power unit is improved, and droop control is performed based on the self-adaptive droop coefficient, so that the voltage regulation range of the energy storage side is smaller under the same power regulation target, the stability of distributed energy storage voltage can be maintained, and the voltage fluctuation of the whole controllable energy storage power station unit is controlled within a certain range.
Example III
In order to implement the above-described embodiments, the present disclosure also proposes a computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, implements the method as described in embodiment two.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and additional implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present application.
Although embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.
Claims (5)
1. The utility model provides a controllable energy storage power station unites thermal power generating set frequency modulation peak shaving system which characterized in that includes: the system comprises a power generation transformation unit, a control unit and a controllable energy storage power station unit of the thermal power generating unit;
the controllable energy storage power station unit is respectively connected with the control unit and the thermal power generating unit and transformation unit;
the thermal power generating unit power generating transformation unit comprises: a generator for generating electricity, maintaining the grid system operating at a first power;
the control unit is used for acquiring a frequency modulation and peak shaving instruction when the power grid system needs frequency modulation and peak shaving, determining the power required to be output by the controllable energy storage power station unit and the self-adaptive droop coefficient based on the frequency modulation and peak shaving instruction, and performing droop control on the controllable energy storage power station unit based on the power required to be output by the controllable energy storage power station unit and the self-adaptive droop coefficient;
the controllable energy storage power station unit is used for charging and discharging based on the sagging control and participating in frequency modulation and peak shaving of a power grid system;
the controllable energy storage power station unit comprises: the system comprises a set A of controllable energy storage grid-connected circuit breaker, a set A of controllable energy storage power station unit, a set B of controllable energy storage grid-connected circuit breaker and a set B of controllable energy storage power station unit;
the A set of controllable energy storage power station unit is connected to an A branch of a low-voltage side of the thermal power double-split starting standby transformer through the A set of controllable energy storage grid-connected circuit breaker;
the B set of controllable energy storage power station unit is connected to a B branch of a low-voltage side of the thermal power double-split starting standby transformer through the B set of controllable energy storage grid-connected circuit breaker;
the A set of controllable energy storage power station units and the B set of controllable energy storage power station units all comprise: the system comprises an A-phase controllable energy storage MMC module, a B-phase controllable energy storage MMC module and a C-phase controllable energy storage MMC module;
the A-phase controllable energy storage MMC module, the B-phase controllable energy storage MMC module and the C-phase controllable energy storage MMC module all comprise: the controllable energy storage MMC upper bridge arm, the controllable energy storage MMC lower bridge arm, the MMC upper bridge arm filter inductor and the MMC lower bridge arm filter inductor;
the controllable energy storage MMC upper bridge arm is connected with the MMC upper bridge arm filter inductor;
the lower bridge arm of the controllable energy storage MMC is connected with the filter inductor of the lower bridge arm of the MMC;
the MMC upper bridge arm filter inductor is connected with the MMC lower bridge arm filter inductor;
the controllable energy storage MMC upper bridge arm and the controllable energy storage MMC lower bridge arm both comprise: a plurality of controllable energy storage MMC sub-modules and a plurality of distributed energy storage devices;
the distributed energy storage device is connected in parallel with the direct current side of the controllable energy storage MMC sub-module;
the controllable energy storage MMC submodule comprises: MMC submodule direct current side filter capacitor, MMC submodule upper bridge arm and MMC submodule lower bridge arm;
the upper bridge arm of the MMC submodule is connected with the lower bridge arm of the MMC submodule and is connected with the direct-current side filter capacitor of the MMC submodule in parallel;
the dc voltage-power droop control is employed in each controllable energy storage MMC sub-module, which can be expressed as:
in the method, in the process of the invention,is the firstiPhase 1jActive power target value of each controllable energy storage MMC sub-module,/->Is the firstiPhase 1jActive power actual value of each controllable energy storage MMC sub-module, < ->Is the firstiPhase 1jDirect-current voltage target value of each controllable energy storage MMC sub-module,/->Is the firstiPhase 1jDirect voltage actual value of each controllable energy storage MMC sub-module, < ->Is the firstiPhase 1jThe adaptive droop coefficients of the controllable energy storage MMC sub-modules;
wherein, the liquid crystal display device comprises a liquid crystal display device,，/>for the magnification factor +.>Is the firstiPhase 1jInitial droop coefficient of each controllable energy storage MMC sub-module,>is the firstiPhase 1jPower regulation of a controllable energy storage MMC sub-module,/->Is the firstiPhase 1jOutput/absorption minimum value of each controllable energy storage MMC sub-module, < >>Is the firstiPhase 1jMaximum power adjustment of the controllable energy storage MMC sub-module,ɑis an adaptive smoothing coefficient;
said firstiPhase 1jThe power adjustment amount of the individual controllable energy storage MMC sub-modules is determined based on the state of charge of the distributed energy storage device.
2. The system of claim 1, wherein the controllable energy storage power station unit is further configured to provide electrical energy to a load device coupled to the thermal power plant power generation and transformation unit when the thermal power plant power generation and transformation unit fails.
3. The system of claim 1, wherein the thermal power generation transformation unit further comprises: the generator main transformer and the thermal power double-split start-up transformer;
the generator is connected to a power grid system through the generator main transformer, wherein the generated energy of the generator is transmitted to the power grid system through the generator main transformer;
the high-voltage side of the thermal power double-split start-up transformer is connected with a power grid system, and the low-voltage side of the thermal power double-split start-up transformer is connected with the controllable energy storage power station unit;
the low-voltage side of the thermal power double-split start-up transformer comprises: a branch and a B branch.
4. A frequency and peak regulating method based on the controllable energy storage power station and thermal power generating unit frequency and peak regulating system according to any one of the preceding claims 1-3, characterized in that the method comprises:
acquiring a frequency modulation peak shaving instruction, and acquiring target power based on the frequency modulation peak shaving instruction;
acquiring a direct current voltage actual value, a direct current voltage target value, an active power actual value, an active power target value and a charge state of each distributed energy storage device of each phase bridge arm of a controllable energy storage power station unit;
obtaining a self-adaptive droop coefficient based on the actual value of each phase of direct current voltage, the target value of the direct current voltage, the actual value of active power, the target value of active power and the state of charge of each distributed energy storage device of the controllable energy storage power station unit, and further obtaining a modulation signal of each bridge arm;
and performing droop control on the controllable energy storage power station unit based on the modulation signal so that the controllable energy storage power station unit performs frequency modulation and peak shaving according to the target power.
5. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the method according to claim 4.
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