CN111555320A - Safe and efficient frequency modulation battery energy storage system with optimized configuration - Google Patents
Safe and efficient frequency modulation battery energy storage system with optimized configuration Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
Abstract
The invention belongs to the technical field of electrochemical energy storage application, and particularly relates to a safe and efficient frequency modulation battery energy storage system with optimized configuration. The frequency modulation energy storage control system divides the whole frequency modulation energy storage system into three frequency modulation energy storage subsystems and dynamically allocates the three frequency modulation energy storage subsystems into a charging part and a discharging part; the frequency modulation energy storage control system receives and executes a frequency modulation power instruction sent by a power grid dispatching terminal through an AGC terminal, monitors and judges in real time, and dynamically distributes again when one frequency modulation energy storage subsystem is full of electric quantity or the electric quantity is discharged, so that the charging and discharging meet the requirements of battery charging and discharging characteristics and the charging and discharging cycle times of the battery are reduced to the maximum extent; the battery damage caused by frequent charge-discharge conversion of the energy storage battery is greatly improved, the efficiency of the energy storage system is effectively improved, the service life of the energy storage system is prolonged, and the investment income is increased.
Description
Technical Field
The invention belongs to the technical field of electrochemical energy storage application, and particularly relates to a safe and efficient frequency modulation battery energy storage system with optimized configuration.
Background
A large amount of new energy electric power is connected into the power grid to bring huge risks to the frequency stability of the power grid, and the stable operation of the power grid is directly influenced. The battery energy storage system has obvious advantages in participating in power grid frequency modulation, and is sought and applied in a large number in the industry. Public data show that the battery energy storage system applied to power grid (power plant) frequency modulation mostly adopts the configuration of energy storage capacity on the premise of meeting power requirements; a 2: 1 configuration is generally adopted, namely a power 2 energy storage 1, namely an energy storage system configured at half hour rate (energy storage capacity of charging or discharging for half hour of full power operation); because the energy storage system configured at the half-hour rate currently selects a storage battery product with the rate of 2-4C, the industry mainly adopts a power type lithium battery at present, and analysis shows that the lithium battery generally has different charging and discharging powers, most of the charging and discharging powers are half of the maximum discharging power, so that the half-hour rate energy storage system selects the lithium battery product with the discharging rate of 4C, if the product with the discharging rate of 2C is selected in the energy storage system configured at the half-hour rate, the actual charging rate of the product reaches the rate of 2C, the lithium battery with the discharging rate of 2C can be damaged, and potential safety hazards can be generated; if the output of the same frequency modulation power is configured based on the rated charging 1C multiplying power, the battery investment is doubled; it is known that the higher the charge/discharge rate of a lithium battery, the higher the cost, and the smaller the number of charge/discharge cycles and the shorter the life.
The lithium battery has the characteristics that the lithium battery is an energy storage type lithium battery with small multiplying power, low cost and long service life, and the cost of the energy storage type lithium battery charged and discharged by 0.3C-1C low multiplying power is about one third of that of a power type lithium battery discharged by 4C high multiplying power; and the number of charge-discharge cycles is more than twice that of the charge-discharge cycles; on the premise of equal application and investment, the selection of a suitable lithium battery product and the design of a frequency modulation battery energy storage system with optimized configuration are particularly important.
Moreover, the battery energy storage system applied to frequency modulation of a power grid (power plant) has the operation characteristics that frequent charging and discharging is needed, and the average charging and discharging times per day reach hundreds of times, which is a great challenge for a power lithium battery with less charging and discharging times and can seriously affect the efficiency and the service life of the lithium battery energy storage system. How to reduce the repeated charge and discharge times of the lithium battery is a key problem for improving the efficiency, the service life and the investment benefit of the frequency modulation energy storage system.
Disclosure of Invention
In order to solve the above problems in the prior art, according to the characteristics of the lithium battery, the top layer design and the optimized configuration of the energy storage system are emphasized, the invention provides a safe and efficient frequency modulation battery energy storage system with optimized configuration, which mainly comprises: grid scheduling terminal, the electric wire netting power line, the electric power communication line, the AGC terminal, frequency modulation energy storage control system, energy storage system communication line, the 1 st energy storage unit of the 1 st energy storage subsystem, the 1 st transformer of the 1 st energy storage subsystem, the 1 st energy storage unit of the 2 nd energy storage subsystem, the 2 nd energy storage unit of the 2 nd energy storage subsystem, the 1 st transformer of the 2 nd energy storage subsystem, the 2 nd energy storage subsystem nth transformer, the 1 st energy storage unit of the 3 rd energy storage subsystem, the k energy storage unit of the 3 rd energy storage subsystem, the 1 st transformer of the 3 rd energy storage subsystem, the k transformer of the 3 rd energy storage subsystem, wherein:
the 1 st energy storage unit of the 1 st energy storage subsystem and the mth energy storage unit of the 1 st energy storage subsystem are respectively connected to a power grid power line of a power grid through a 1 st transformer of the 1 st energy storage subsystem and a mth transformer of the 1 st energy storage subsystem to form a 1 st frequency modulation energy storage subsystem and energy storage system frequency modulation power path;
the 1 st energy storage unit of the 2 nd energy storage subsystem and the nth energy storage unit of the 2 nd energy storage subsystem are respectively connected to a power grid power line of a power grid through a 1 st transformer of the 2 nd energy storage subsystem and an nth transformer of the 2 nd energy storage subsystem to form a frequency modulation power path of the 2 nd frequency modulation energy storage subsystem and the energy storage system;
the 1 st energy storage unit of the 3 rd energy storage subsystem and the kth energy storage unit of the 3 rd energy storage subsystem are respectively connected to a power grid power line of a power grid through a 1 st transformer of the 3 rd energy storage subsystem and a kth transformer of the 3 rd energy storage subsystem to form a frequency modulation power path of the 2 nd frequency modulation energy storage subsystem and the energy storage system;
the power grid dispatching terminal is connected with the AGC terminal through a power communication line to form a communication link issued by a power grid frequency modulation dispatching control instruction;
the frequency modulation energy storage control system is respectively connected with a 1 st energy storage unit of a 1 st energy storage subsystem, an mth energy storage unit of the 1 st energy storage subsystem, a 1 st energy storage unit of a 2 nd energy storage subsystem, an nth energy storage unit of the 2 nd energy storage subsystem, a 1 st energy storage unit of a 3 rd energy storage subsystem and a kth energy storage unit of the 3 rd energy storage subsystem through an energy storage system communication line to form a communication link for frequency modulation control of the frequency modulation energy storage system;
the frequency modulated energy storage system is further characterized in that: the whole frequency modulation energy storage system is divided into 3 frequency modulation energy storage subsystems, the rated charge-discharge power of each frequency modulation energy storage subsystem is not less than the power required by the frequency modulation of a power grid, and the power and the energy storage capacity of each frequency modulation energy storage subsystem are equal;
an operation control method of an optimally configured safe and efficient frequency modulation battery energy storage system comprises the following steps:
when the frequency modulation energy storage system is started and operates normally, the frequency modulation energy storage control system monitors in real time and designates two frequency modulation energy storage subsystems with less stored electric quantity in 3 frequency modulation energy storage subsystems as charging frequency modulation energy storage subsystems, and designates 1 frequency modulation energy storage subsystem with more stored electric quantity in the 3 frequency modulation energy storage subsystems as discharging frequency modulation energy storage subsystems;
the frequency modulation energy storage control system receives a frequency modulation power instruction sent by a power grid dispatching terminal through an AGC terminal, and controls a discharging frequency modulation energy storage subsystem to discharge according to the discharging power required by the power grid dispatching if the instruction is judged to be a positive power frequency modulation demand instruction; if the negative power frequency modulation demand instruction is judged, controlling the 2 charging frequency modulation energy storage subsystems to charge according to the charging power required by the power grid scheduling;
the frequency modulation energy storage control system executes a frequency modulation power instruction sent by the power grid dispatching terminal through the AGC terminal in real time and monitors the stored electric quantity data of 3 frequency modulation energy storage subsystems in real time to judge, when 1 frequency modulation energy storage subsystem in 2 charged frequency modulation energy storage subsystems is full of electric quantity or the discharged stored electric quantity of the frequency modulation energy storage subsystem is discharged, when any one of the two reaches first, the frequency modulation energy storage control system performs dynamic adjustment: the method comprises the steps that a frequency modulation energy storage subsystem with full current charging capacity is designated as a discharging frequency modulation energy storage subsystem, meanwhile, a current discharging frequency modulation energy storage subsystem is designated as a charging frequency modulation energy storage subsystem, so that the rated energy storage capacity of the charging frequency modulation energy storage subsystem is always two times of the rated energy storage capacity of the discharging frequency modulation energy storage subsystem, the rated energy storage capacity of the charging energy storage subsystem is always two times of the rated energy storage capacity of the discharging frequency modulation energy storage subsystem in a dynamic adjustment process and only charging is carried out, and the other discharging frequency modulation energy storage subsystem only discharges.
The safe and efficient frequency modulation battery energy storage system with optimized configuration is characterized in that an energy storage unit forming a frequency modulation energy storage subsystem is formed by connecting a storage battery pack string, a battery management system BMS, an energy storage converter and accessories.
The safe and efficient frequency modulation battery energy storage system with optimized configuration is characterized in that the frequency modulation energy storage control system mainly comprises: computer real-time control module, preset system program module, data storage module circuit piece, clock circuit module, communication management module, power circuit module, control bus, wherein:
the computer real-time control module is respectively connected with the preset system program module, the data storage module circuit block, the clock circuit module, the communication management module and the power circuit module through a control bus to form a frequency modulation energy storage management and control system and a control and communication link;
the computer real-time control module is connected with the power communication line and the AGC terminal through the communication management module to receive a frequency modulation power instruction sent by the power grid dispatching terminal, and is connected with the energy storage system communication line and the frequency modulation energy storage system through the communication management module to form a control link for frequency modulation power distribution and monitoring of the frequency modulation energy storage system.
According to the optimally configured safe and efficient frequency modulation battery energy storage system, the whole frequency modulation energy storage system is divided into three frequency modulation energy storage subsystems according to the fact that the characteristic indexes of energy storage units selected by a newly-built frequency modulation energy storage system are basically consistent, and the current multiplying power of the general discharge of a lithium battery is twice of the current multiplying power of the charge, and dynamic allocation is carried out: the three frequency modulation energy storage subsystems are divided into a charging part and a discharging part, namely two thirds of the frequency modulation energy storage subsystems with less stored electricity are designated as the frequency modulation energy storage subsystems of the charging part, and the other frequency modulation energy storage subsystems with more stored electricity are designated as the frequency modulation energy storage subsystems of the discharging part, so that the control is simplified, the control difficulty is reduced, deep charging and discharging can be completed by one frequency modulation energy storage subsystem in each dynamic allocation period, the battery management and calibration are facilitated, and the operation efficiency and the safety are improved; the frequency modulation energy storage control system receives and executes a frequency modulation power instruction sent by a power grid dispatching terminal through an AGC terminal and carries out monitoring and judgment in real time, when one of three frequency modulation energy storage subsystems is full of electric quantity or the electric quantity is discharged, dynamic distribution is carried out again, so that charging and discharging meet the requirements of battery charging and discharging characteristics, the charging and discharging times of a battery are reduced to the maximum extent, the energy storage subsystems of a charging part are only charged in one process, and the energy storage subsystems of a discharging part are only discharged; the battery damage caused by frequent charge-discharge conversion of the energy storage battery is greatly improved, the running safety of the energy storage system is increased, the efficiency of the energy storage system is effectively improved, the service life of the energy storage system is prolonged, and the investment income is increased.
Drawings
Fig. 1 is a schematic block diagram of an optimally configured safe and efficient frequency modulated battery energy storage system.
Fig. 2 is a schematic diagram of the principle of the frequency-modulated energy storage control system.
Detailed Description
An optimally configured safe and efficient frequency modulation battery energy storage system is described with reference to the drawings as an implementation example, but the technology and the scheme of the invention are not limited to the contents given in the embodiment.
As shown in fig. 1, an optimally configured safe and efficient frequency modulation battery energy storage system mainly includes: a power grid dispatching terminal (1), a power grid (2), a power grid power line (3), a power communication line (4), an AGC terminal (5), a frequency modulation energy storage control system (6), an energy storage system communication line (7), a 1 st energy storage unit (11) of a 1 st energy storage subsystem, a 1 st energy storage unit (1m) of the 1 st energy storage subsystem, a 1 st transformer (11a) of the 1 st energy storage subsystem, a 1 st transformer (1ma) of the 1 st energy storage subsystem, a 1 st energy storage unit (21) of a 2 nd energy storage subsystem, an nth energy storage unit (2n) of the 2 nd energy storage subsystem, a 1 st transformer (21a) of the 2 nd energy storage subsystem, an nth transformer (2na) of the 2 nd energy storage subsystem, a 1 st energy storage unit (31) of the 3 rd energy storage subsystem, a kth energy storage unit (3k) of the 3 rd energy storage subsystem, a 1 st transformer (31, wherein:
a 1 st energy storage unit (11) of the 1 st energy storage subsystem and a 1 st energy storage unit (1m) of the 1 st energy storage subsystem are respectively connected to a power grid power line (3) of a power grid (2) through a 1 st transformer (11a) of the 1 st energy storage subsystem and a 1 st transformer (1ma) of the 1 st energy storage subsystem to form a 1 st frequency modulation energy storage subsystem and energy storage system frequency modulation power path;
a 1 st energy storage unit (21) and a 2 nd energy storage subsystem nth energy storage unit (2n) of the 2 nd energy storage subsystem are respectively connected to a power grid power line (3) of a power grid (2) through a 1 st transformer (21a) and a 2 nd energy storage subsystem nth transformer (2na) of the 2 nd energy storage subsystem to form a 2 nd frequency modulation energy storage subsystem and energy storage system frequency modulation power path;
a 1 st energy storage unit (31) and a 3 rd energy storage subsystem kth energy storage unit (3k) of the 3 rd energy storage subsystem are respectively connected to a power grid power line (3) of a power grid (2) through a 1 st transformer (31a) and a 3 rd energy storage subsystem kth transformer (3ka) of the 3 rd energy storage subsystem to form a 2 nd frequency modulation energy storage subsystem and energy storage system frequency modulation power path;
the power grid dispatching terminal (1) is connected with the AGC terminal (5) through a power communication line (4) to form a communication link issued by a power grid frequency modulation dispatching control instruction;
the frequency modulation energy storage control system (6) is respectively connected with a 1 st energy storage unit (11) of a 1 st energy storage subsystem, a 1 st energy storage unit (1m) of the 1 st energy storage subsystem, a 1 st energy storage unit (21) of a 2 nd energy storage subsystem, an nth energy storage unit (2n) of the 2 nd energy storage subsystem, a 1 st energy storage unit (31) of a 3 rd energy storage subsystem and a kth energy storage unit (3k) of the 3 rd energy storage subsystem through an energy storage system communication line (7) to form a communication link for frequency modulation control of the frequency modulation energy storage system;
the frequency modulated energy storage system is further characterized in that: the whole frequency modulation energy storage system is divided into 3 frequency modulation energy storage subsystems, the rated charge-discharge power of each frequency modulation energy storage subsystem is not less than the power required by the frequency modulation of a power grid, and the power and the energy storage capacity of each frequency modulation energy storage subsystem are equal;
an operation control method of an optimally configured safe and efficient frequency modulation battery energy storage system comprises the following steps:
when the frequency modulation energy storage system is started to operate normally, the frequency modulation energy storage control system (6) monitors in real time and designates two frequency modulation energy storage subsystems with less stored electric quantity in 3 frequency modulation energy storage subsystems as charging frequency modulation energy storage subsystems, and designates 1 frequency modulation energy storage subsystem with more stored electric quantity in 3 frequency modulation energy storage subsystems as discharging frequency modulation energy storage subsystems;
the frequency modulation energy storage control system (6) receives a frequency modulation power instruction sent by the power grid dispatching terminal (1) through the AGC terminal (5), and controls the discharging frequency modulation energy storage subsystem to discharge according to the discharging power required by power grid dispatching if the instruction is judged to be a positive power frequency modulation demand instruction; if the negative power frequency modulation demand instruction is judged, controlling the 2 charging frequency modulation energy storage subsystems to charge according to the charging power required by the power grid scheduling;
the frequency modulation energy storage control system (6) executes a frequency modulation power instruction sent by the power grid dispatching terminal (1) through the AGC terminal (5) and monitors the stored electric quantity data of the 3 frequency modulation energy storage subsystems in real time to judge, when 1 frequency modulation energy storage subsystem in the 2 charged frequency modulation energy storage subsystems is full of electric quantity or the discharged frequency modulation energy storage subsystem is discharged, when any one of the two reaches first, the frequency modulation energy storage control system (6) performs dynamic adjustment: the method comprises the steps that a frequency modulation energy storage subsystem with full current charging capacity is designated as a discharging frequency modulation energy storage subsystem, meanwhile, a current discharging frequency modulation energy storage subsystem is designated as a charging frequency modulation energy storage subsystem, so that the rated energy storage capacity of the charging frequency modulation energy storage subsystem is always two times of the rated energy storage capacity of the discharging frequency modulation energy storage subsystem, the rated energy storage capacity of the charging energy storage subsystem is always two times of the rated energy storage capacity of the discharging frequency modulation energy storage subsystem in a dynamic adjustment process and only charging is carried out, and the other discharging frequency modulation energy storage subsystem only discharges.
The safe and efficient frequency modulation battery energy storage system with optimized configuration is characterized in that an energy storage unit forming an energy storage subsystem is formed by connecting a storage battery pack string, a battery management system BMS, an energy storage converter and accessories.
As shown in fig. 2, the optimally configured safe and efficient frequency modulation battery energy storage system is characterized in that the frequency modulation energy storage control system (6) mainly comprises: computer real-time control module (601), preset system program module (602), data storage module circuit block (603), clock circuit module (604), communication management module (605), power supply circuit module (606), control bus (607), wherein:
the computer real-time control module (601) is respectively connected with a preset system program module (602), a data storage module circuit block (603), a clock circuit module (604), a communication management module (605) and a power circuit module (606) through a control bus (607) to form a frequency modulation energy storage management and control system and a control and communication link;
the computer real-time control module (601) is connected with the power communication line (4) and the AGC terminal (5) through the communication management module (605) to receive the frequency modulation power instruction sent by the power grid dispatching terminal (1), and is connected with the energy storage system communication line (7) and the frequency modulation energy storage system through the communication management module (605) to form a control link for frequency modulation power distribution and monitoring of the frequency modulation energy storage system.
The invention relates to an optimally configured safe and efficient frequency modulation battery energy storage system, which divides the whole frequency modulation energy storage system into three or more frequency modulation energy storage subsystems and performs dynamic distribution: dividing three or more frequency modulation energy storage subsystems into a charging part and a discharging part, namely, designating two thirds of the frequency modulation energy storage subsystems with less stored electricity as the frequency modulation energy storage subsystems of the charging part, and designating the rest frequency modulation energy storage subsystems with more stored electricity as the frequency modulation energy storage subsystems of the discharging part; the frequency modulation energy storage control system receives and executes a frequency modulation power instruction sent by a power grid dispatching terminal through an AGC terminal and carries out monitoring and judgment in real time, when one of three or more than three frequency modulation energy storage subsystems is full of electric quantity or the electric quantity is discharged, dynamic distribution is carried out again, so that charging and discharging meet the requirements of battery charging and discharging characteristics and the charging and discharging cycle times of the battery are reduced to the maximum extent, in one process, the energy storage subsystem of a charging part is only charged, and the energy storage subsystem of a discharging part is only discharged; the battery damage caused by frequent charge-discharge conversion of the energy storage battery is greatly improved, the running safety of the energy storage system is increased, the efficiency of the energy storage system is effectively improved, the service life of the energy storage system is prolonged, and the investment income is increased.
Claims (3)
1. An optimally configured safe and efficient frequency modulation battery energy storage system mainly comprises: a power grid dispatching terminal (1), a power grid (2), a power grid power line (3), a power communication line (4), an AGC terminal (5), a frequency modulation energy storage control system (6), an energy storage system communication line (7), a 1 st energy storage unit (11) of a 1 st energy storage subsystem, a 1 st energy storage unit (1m) of the 1 st energy storage subsystem, a 1 st transformer (11a) of the 1 st energy storage subsystem, a 1 st transformer (1ma) of the 1 st energy storage subsystem, a 1 st energy storage unit (21) of a 2 nd energy storage subsystem, an nth energy storage unit (2n) of the 2 nd energy storage subsystem, a 1 st transformer (21a) of the 2 nd energy storage subsystem, an nth transformer (2na) of the 2 nd energy storage subsystem, a 1 st energy storage unit (31) of the 3 rd energy storage subsystem, a kth energy storage unit (3k) of the 3 rd energy storage subsystem, a 1 st transformer (31, wherein:
a 1 st energy storage unit (11) of the 1 st energy storage subsystem and a 1 st energy storage unit (1m) of the 1 st energy storage subsystem are respectively connected to a power grid power line (3) of a power grid (2) through a 1 st transformer (11a) of the 1 st energy storage subsystem and a 1 st transformer (1ma) of the 1 st energy storage subsystem to form a 1 st frequency modulation energy storage subsystem and energy storage system frequency modulation power path;
a 1 st energy storage unit (21) and a 2 nd energy storage subsystem nth energy storage unit (2n) of the 2 nd energy storage subsystem are respectively connected to a power grid power line (3) of a power grid (2) through a 1 st transformer (21a) and a 2 nd energy storage subsystem nth transformer (2na) of the 2 nd energy storage subsystem to form a 2 nd frequency modulation energy storage subsystem and energy storage system frequency modulation power path;
a 1 st energy storage unit (31) and a 3 rd energy storage subsystem kth energy storage unit (3k) of the 3 rd energy storage subsystem are respectively connected to a power grid power line (3) of a power grid (2) through a 1 st transformer (31a) and a 3 rd energy storage subsystem kth transformer (3ka) of the 3 rd energy storage subsystem to form a 2 nd frequency modulation energy storage subsystem and energy storage system frequency modulation power path;
the power grid dispatching terminal (1) is connected with the AGC terminal (5) through a power communication line (4) to form a communication link issued by a power grid frequency modulation dispatching control instruction;
the frequency modulation energy storage control system (6) is respectively connected with a 1 st energy storage unit (11) of a 1 st energy storage subsystem, a 1 st energy storage unit (1m) of the 1 st energy storage subsystem, a 1 st energy storage unit (21) of a 2 nd energy storage subsystem, an nth energy storage unit (2n) of the 2 nd energy storage subsystem, a 1 st energy storage unit (31) of a 3 rd energy storage subsystem and a kth energy storage unit (3k) of the 3 rd energy storage subsystem through an energy storage system communication line (7) to form a communication link for frequency modulation control of the frequency modulation energy storage system;
the frequency modulated energy storage system is further characterized in that: the whole frequency modulation energy storage system is divided into 3 frequency modulation energy storage subsystems, the rated charge-discharge power of each frequency modulation energy storage subsystem is not less than the power required by the frequency modulation of a power grid, and the power and the energy storage capacity of each frequency modulation energy storage subsystem are equal;
an operation control method of an optimally configured safe and efficient frequency modulation battery energy storage system comprises the following steps:
when the frequency modulation energy storage system is started to operate normally, the frequency modulation energy storage control system (6) monitors in real time and designates two frequency modulation energy storage subsystems with less stored electric quantity in 3 frequency modulation energy storage subsystems as charging frequency modulation energy storage subsystems, and designates 1 frequency modulation energy storage subsystem with more stored electric quantity in 3 frequency modulation energy storage subsystems as discharging frequency modulation energy storage subsystems;
the frequency modulation energy storage control system (6) receives a frequency modulation power instruction sent by the power grid dispatching terminal (1) through the AGC terminal (5), and controls the discharging frequency modulation energy storage subsystem to discharge according to the discharging power required by power grid dispatching if the instruction is judged to be a positive power frequency modulation demand instruction; if the negative power frequency modulation demand instruction is judged, controlling the 2 charging frequency modulation energy storage subsystems to charge according to the charging power required by the power grid scheduling;
the frequency modulation energy storage control system (6) executes a frequency modulation power instruction sent by the power grid dispatching terminal (1) through the AGC terminal (5) and monitors the stored electric quantity data of the 3 frequency modulation energy storage subsystems in real time to judge, when 1 frequency modulation energy storage subsystem in the 2 charged frequency modulation energy storage subsystems is full of electric quantity or the discharged frequency modulation energy storage subsystem is discharged, when any one of the two reaches first, the frequency modulation energy storage control system (6) performs dynamic adjustment: the method comprises the steps that a frequency modulation energy storage subsystem with full current charging capacity is designated as a discharging frequency modulation energy storage subsystem, meanwhile, a current discharging frequency modulation energy storage subsystem is designated as a charging frequency modulation energy storage subsystem, so that the rated energy storage capacity of the charging frequency modulation energy storage subsystem is always two times of the rated energy storage capacity of the discharging frequency modulation energy storage subsystem, the rated energy storage capacity of the charging energy storage subsystem is always two times of the rated energy storage capacity of the discharging frequency modulation energy storage subsystem in a dynamic adjustment process and only charging is carried out, and the other discharging frequency modulation energy storage subsystem only discharges.
2. The optimally configured safe and efficient frequency modulation battery energy storage system according to claim 1, wherein the energy storage units forming the frequency modulation energy storage subsystem are formed by connecting a storage battery pack string, a Battery Management System (BMS), an energy storage converter and accessories.
3. An optimally configured safe and efficient frequency-modulated battery energy storage system as claimed in claim 1, wherein the frequency-modulated energy storage control system (6) essentially comprises: computer real-time control module (601), preset system program module (602), data storage module circuit block (603), clock circuit module (604), communication management module (605), power supply circuit module (606), control bus (607), wherein:
the computer real-time control module (601) is respectively connected with a preset system program module (602), a data storage module circuit block (603), a clock circuit module (604), a communication management module (605) and a power circuit module (606) through a control bus (607) to form a frequency modulation energy storage management and control system and a control and communication link;
the computer real-time control module (601) is connected with the power communication line (4) and the AGC terminal (5) through the communication management module (605) to receive the frequency modulation power instruction sent by the power grid dispatching terminal (1), and is connected with the energy storage system communication line (7) and the frequency modulation energy storage system through the communication management module (605) to form a control link for frequency modulation power distribution and monitoring of the frequency modulation energy storage system.
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