CN115276054A - Coordination control method for gravity energy storage matrix system of new energy plant station - Google Patents
Coordination control method for gravity energy storage matrix system of new energy plant station 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G3/00—Other motors, e.g. gravity or inertia motors
- F03G3/087—Gravity or weight motors
- F03G3/094—Gravity or weight motors specially adapted for potential energy power storage stations; combinations of gravity or weight motors with electric motors or 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
- H02J15/00—Systems for storing electric energy
- H02J15/007—Systems for storing electric energy involving storage in the form of mechanical energy, e.g. fly-wheels
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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Abstract
A coordination control method for a gravity energy storage matrix system of a new energy plant station relates to a coordination control technology for the gravity energy storage matrix system, and aims to solve the problem that an existing gravity energy storage system is poor in safety. According to the method, the active power reference value exchanged between the gravity energy storage matrix system and the new energy plant station alternating-current bus is respectively increased or reduced by judging the running state of the gravity energy storage matrix system; and judging whether active power reference values exchanged between the gravity energy storage matrix system and the new energy plant station alternating-current bus reach rated output power of the new energy plant station, executing the active power reference values respectively, disconnecting the connection operation between the gravity energy storage matrix system and the new energy plant station, enabling the gravity energy storage matrix system to enter a discharging state operation, and enabling the gravity energy storage matrix system to enter a charging state. The invention improves the electric energy output quality and the stability and safety of the operation of the new energy plant station, and is suitable for performing coordination control on the gravity energy storage matrix system of the new energy plant station in the alpine region.
Description
Technical Field
The invention relates to a coordination control technology of a gravity energy storage matrix system.
Background
Clean renewable energy power generation represented by wind power and photovoltaic is receiving more and more extensive attention; however, the new energy power generation has strong randomness and fluctuation, so that system voltage fluctuation and unstable operation are caused, and large-scale application of the new energy power generation always brings great challenges to a power grid system; in recent years, with the progress of industrial science and technology, particularly the development of power electronic technology, the energy storage technology gradually becomes a research hotspot in the field of renewable energy sources, and provides a new method and thinking for solving the problem; currently, the available energy storage technologies include pumped water energy storage, electrochemical energy storage, flywheel energy storage, super capacitor energy storage, and newly developed gravity energy storage; compared with other energy storage modes, the gravity energy storage has remarkable advantages in alpine regions; the principle is simple, the structure only comprises a mechanical device and power electronic equipment, the energy conversion process does not involve chemical change, and compared with electrochemical energy storage, the device has the characteristics of long service life, high response speed and no pollution; compared with pumped storage, the construction of the gravity energy storage system is rarely restricted by geographical factors, and the engineering construction period is short; compared with a super capacitor, the mechanical and electrical structure for gravity energy storage saves construction cost; based on the remarkable advantages, the gravity energy storage is an ideal choice for the energy storage application of the new energy power generation system in the alpine region; at present, the research on gravity energy storage is limited, but the operation principle of the gravity energy storage is similar to that of flywheel energy storage, so that the gravity energy storage has certain reference value for application research of a plurality of flywheel energy storage and other energy storage technologies; however, the power generation scale of the new energy plant station is far larger than that of a single unit, and a larger-capacity energy storage system is required to be matched with the new energy plant station, so that the research results about flywheel energy storage cannot meet the energy storage requirements of large-scale new energy plant stations; although the existing gravity energy storage system can store the electric energy of a large-scale new energy plant station, the safety of the charging and discharging process is poor.
Disclosure of Invention
The invention aims to solve the problem that an existing gravity energy storage system is poor in safety, and provides a coordination control method for a gravity energy storage matrix system of a new energy plant.
The invention relates to a coordination control method for a gravity energy storage matrix system of a new energy plant station, which comprises the following steps:
step one, judging the running state of a gravity energy storage matrix system; if the gravity energy storage matrix system is in an overcharged state, executing a second step; if the gravity energy storage matrix system is in an over-discharge state, executing a third step; otherwise, if the gravity energy storage matrix system is in a safe operation state, executing the ninth step;
step two, improving an active power reference value exchanged between the gravity energy storage matrix system and the new energy station alternating current bus, and executing step four;
step three, reducing an active power reference value exchanged between the gravity energy storage matrix system and the new energy station alternating current bus, and executing step five;
step four, judging whether the active power reference value exchanged between the improved gravity energy storage matrix system and the new energy plant station alternating-current bus reaches the rated output power of the new energy plant station or not; if the rated output power of the new energy plant station is reached, executing a sixth step; if the rated output power of the new energy plant station is not reached, executing a seventh step;
judging whether the active power reference value exchanged between the reduced gravity energy storage matrix system and the new energy plant station alternating-current bus reaches the rated output power of the new energy plant station or not; if the rated output power of the new energy plant station is not reached, executing a sixth step; if the rated output power of the new energy plant station is reached, executing a step eight;
step six, disconnecting the gravity energy storage matrix system from the new energy plant station, and executing step nine;
step seven, the gravity energy storage matrix system enters a discharging state, and the step nine is executed;
step eight, the gravity energy storage matrix system enters a charging state, and step nine is executed;
and step nine, finishing the coordination control on the gravity energy storage matrix system.
The beneficial effects of the invention are: the invention designs a network topology structure of the gravity energy storage matrix system, and designs a charge and discharge control strategy and a safety control strategy of the system based on the structure; the coordination control method realizes smooth output of active power of the new energy plant station, improves electric energy output quality and stability and safety of operation of the new energy plant station, and is beneficial to stabilizing bus voltage of the new energy plant station, improving grid-connected capacity of the new energy plant station in alpine regions and reducing pollution of new energy power generation to an electric power system.
The method is suitable for performing coordination control on the gravity energy storage matrix system of the new energy station in the alpine region.
Drawings
Fig. 1 is a flowchart of a coordination control method of a gravity energy storage matrix system of a new energy plant according to a first embodiment;
fig. 2 is a topology structure diagram of an integrated connection network related to a gravity energy storage system according to a second embodiment;
fig. 3 is a schematic structural diagram of a gravity energy storage unit in a third embodiment.
Detailed Description
The first embodiment is as follows: the present embodiment is described with reference to fig. 1, and the method for coordinating and controlling a gravity energy storage matrix system of a new energy plant station according to the present embodiment is characterized by comprising the following steps:
step one, judging the running state of a gravity energy storage matrix system; if the gravity energy storage matrix system is in an overcharged state, executing a second step; if the gravity energy storage matrix system is in an over-discharge state, executing a third step; otherwise, if the gravity energy storage matrix system is in a safe operation state, executing the ninth step;
step two, improving an active power reference value exchanged between the gravity energy storage matrix system and the new energy plant station alternating current bus, and executing step four;
step three, reducing an active power reference value exchanged between the gravity energy storage matrix system and the new energy plant station alternating current bus, and executing step five;
step four, judging whether the active power reference value exchanged between the improved gravity energy storage matrix system and the new energy plant station alternating-current bus reaches the rated output power of the new energy plant station or not; if the rated output power of the new energy plant station is reached, executing a sixth step; if the rated output power of the new energy plant station is not reached, executing a seventh step;
judging whether the active power reference value exchanged between the reduced gravity energy storage matrix system and the new energy plant station alternating-current bus reaches the rated output power of the new energy plant station or not; if the rated output power of the new energy plant station is not reached, executing a sixth step; if the rated output power of the new energy plant station is reached, executing the step eight;
step six, disconnecting the gravity energy storage matrix system from the new energy plant station, and executing step nine;
step seven, the gravity energy storage matrix system enters a discharging state, and step nine is executed;
step eight, the gravity energy storage matrix system enters a charging state, and step nine is executed;
and step nine, finishing the coordination control on the gravity energy storage matrix system.
In the embodiment, according to the characteristic of large power generation scale of the new energy plant, an energy storage matrix system composed of a plurality of gravity energy storage units is introduced for energy storage, a network topology structure of the gravity energy storage matrix system and the new energy plant in the power system is designed, and a charging and discharging control strategy and a safety control strategy corresponding to the gravity energy storage matrix system are provided.
The second embodiment is as follows: the present embodiment is described with reference to fig. 2, and the present embodiment is further limited to the coordination control method for a gravity energy storage matrix system of a new energy plant according to the first specific embodiment, in the present embodiment, the gravity energy storage matrix system according to the first step belongs to an energy storage mechanism in an integrated connection network topology in the new energy plant;
the integrated connection network topology structure also comprises an inverter and a bidirectional converter;
electric energy generated by a wind turbine generator or photovoltaic power generation is connected to a new energy plant station alternating current bus through an inverter; the gravity energy storage matrix system is connected with an alternating current bus of the new energy plant station in parallel through a bidirectional converter.
In the present embodiment, the following advantages are connected to the integrated form:
(1) The fluctuation degree of the whole output active power of the new energy plant station is gentler than that of a single unit, so that the charging and discharging frequency of the gravity energy storage unit can be reduced;
(2) The master-slave control mode of the gravity energy storage matrix system is conveniently introduced, and the working coordination of the system is improved;
(3) The main controller can close the individual gravity energy storage units, thereby reducing unnecessary operation loss of the system, or cutting off the individual gravity energy storage units when the individual gravity energy storage units are in failure, and improving the fault tolerance of the gravity energy storage matrix system.
In conclusion, the integrated network topology structure of the gravity energy storage matrix system is more beneficial to the coordination control and operation of the system.
The third concrete implementation mode: referring to fig. 3, a description is given of the present embodiment, which further defines a coordination control method for a gravity energy storage matrix system of a new energy plant according to a second embodiment, in the present embodiment, the gravity energy storage matrix system includes a plurality of gravity energy storage units;
each gravity energy storage unit comprises a weight 1, a transmission mechanism 2, a power generation and electric integrated machine 3, power electronic equipment 4 and a support body 5;
the weight 1, the transmission mechanism 2, the power generation and electric integration machine 3 and the power electronic equipment 4 are respectively arranged on the support body 5;
the weight 1 is connected to a rotating shaft of the power generation and electric integrated machine 3 through a transmission mechanism 2 in the vertical direction; the power input and output end of the power generation and electric integration machine 3 is connected with the power input and output end of the power electronic equipment 4.
In the embodiment, the gravity energy storage has various forms, specifically, two forms are provided, namely a vertical form and a slope form, the vertical form is divided into a tower form and a shaft form, and each form is divided into a single-weight form and a multiple-weight form; however, in any form, the principle is that the gravitational potential energy formed by the fall height in the process of moving the heavy object up and down is utilized to store energy; during energy storage, the power generation and electric integrated machine 3 runs in an electric state to drag the heavy object 1 to rise; when releasing energy, the power generation and electric integrated machine 3 runs in a power generation state and is dragged by the descending weight 1 to generate power; in both processes, the kinetic energy of the power generation and electric integrated machine 3 is used as a medium to complete the conversion between the electric energy and the gravitational potential energy of the heavy object 1.
In this embodiment, the gravity energy storage matrix system needs to avoid overcharging and overdischarging; if the heavy object 1 reaches the high position after overcharging, the power generation and electric integrated machine 3 is still dragged continuously, and overlarge stress of the steel cable and damage to the transmission mechanism 2 can be caused; if over-discharge occurs, the weight 1 reaches a low position and cannot continuously descend to do work, and the power generation and electric integrated machine 3 still maintains a certain rotating speed due to inertia, so that the steel cable is accumulated and wound, and safety accidents can be caused when the power generation and electric integrated machine is charged again; therefore, the overcharge and discharge safety control strategy of the gravity energy storage matrix system is a necessary basic strategy, and plays an important role in prolonging the service life of the system, reducing the maintenance cost, and keeping the system stable and efficient operation.
In alpine regions, wind and light resources are sufficient in general winter, the new energy source unit can always generate sufficient electric energy, and the gravity energy storage matrix system can be fully charged; in this case, the total output power reference P of the system to the grid should be increased CH The gravity energy storage matrix system is converted into a discharge state, and the power transmission quantity of the whole energy storage matrix system to a power grid is improved; in summer, the wind resources are less, although the sunshine time is longer than that in winter, the weather is rainy, so that the wind and light resources are slightly deficient, the electric energy generated by a new energy plant station is less, the gravity energy storage matrix system can continuously discharge, and the gravity energy storage matrix system can be endangered or can reach a complete discharge state; at this time, the total output power set value P from the gravity energy storage matrix system to the power grid should be reduced CH And the new energy source unit can supplement partial electric energy to the gravity energy storage system to prepare for later operation.
The fourth concrete implementation mode is as follows: in this embodiment, the coordination control method for the gravity energy storage matrix system of the new energy plant station according to the third embodiment is further defined, and in this embodiment, the energy stored by the gravity energy storage unit is:
E cun ＝mgh max (1)
wherein, E cun Energy stored for the gravity energy storage unit; m is the mass of the weight (1); g is gravity acceleration; h is a total of max Is the upper limit of the vertical height of the weight (1);
the energy released by the gravity energy storage unit is as follows:
E valid ＝mgh max -h min (2)
wherein, E valid The energy released by the gravity energy storage unit; h is min Is the lower limit of the vertical height of the weight (1).
In the present embodiment, the larger the mass of the weight 1, the higher the height of the fall, and the more effective energy the gravity energy storage unit can store.
The fifth concrete implementation mode is as follows: in this embodiment, the method for calculating the active power reference value exchanged between the gravity energy storage matrix system and the ac bus of the new energy plant in the second step or the third step is as follows:
P CH ＝P REF -P WS (3)
wherein, P CH The active power reference value is exchanged between the gravity energy storage matrix system and the new energy station alternating current bus; p is REF A total power reference value which is output to an alternating current bus of a power grid by the combination of the new energy plant station and the gravity energy storage system; p WS The active power actually sent out for the new energy plant station;
the calculation formula of the active power actually generated by the energy plant station is shown as a formula (4);
P WS ＝P OUT -P G (4)
wherein, P OUT Actual active power output to an alternating current bus of a power grid is combined by the new energy plant and the gravity energy storage matrix system; p is G For the actual output active power of the gravity energy storage matrix system, and if P G Is a negative value, which represents that the gravity energy storage matrix system is in a charging state if P G Is a positive value, representing that the gravity energy storage matrix system is in a discharging state.
In this embodiment, P REF The method is determined by relevant departments of power production according to different working conditions and can be adjusted in time; if P REF >P WS The gravity energy storage matrix system is required to release energy to supplement the output power of the new energy source unit; if P REF <P WS Meaning that the gravity energy storage matrix system is required to absorb part of the electrical energy from the new energy plant to smooth the output power peak of the new energy plant; in order to reduce the running loss and the switching loss of the gravity energy storage unit, the push button can be adopted when the charging and discharging control and switching are executedAnd in a proportional mode, distributing input and output power to each gravity energy storage unit.
The sixth specific implementation mode is as follows: in the fifth embodiment, when the gravity energy storage matrix system enters a discharging state in the seventh embodiment, the weights 1 in the energy storage units are sequentially put down, and the weights 1 drag the power generation and electric integrated machine 3 to generate power; assuming that the gravity energy storage matrix system consists of m gravity energy storage units, at a certain initial discharge moment, n gravity energy storage units work in a charging mode of a previous stage and are already connected to an alternating current bus of a power grid; if the maximum output power of the n gravity energy storage units is ordered as:
P max1 ＞P max2 ＞…＞P max n (5)
wherein, P max1 Representing the maximum output power of the first gravity energy storage unit; p is max2 Representing the maximum output power of the second gravity energy storage unit; p is maxn The maximum output power of the nth gravity energy storage unit is represented;
then, the maximum output power of the m-n energy storage units not connected to the ac bus of the power grid is ranked as:
P max(n+1) ＞P max(n+2) ＞…＞P max m (6)
wherein, P max(n+1) The maximum output power of the (n + 1) th gravity energy storage unit is represented; p is max(n+2) The maximum output power of the (n + 2) th gravity energy storage unit is represented; p is max m Representing the maximum output power of the mth gravity energy storage unit;
aiming at different working conditions, the power of the gravity energy storage matrix is distributed in a proportion mode as follows:
(1) If it is not
P CH ＜P max1 (7)
If the current discharging task is finished independently by the first gravity energy storage unit, temporarily cutting off the connection between the other gravity energy storage units and an alternating current bus of the power grid;
(2) If it is not
Wherein i is the sequence number of the gravity energy storage unit; k is the number of introduced gravity energy storage units; the k gravity energy storage units finish the discharge task through combined operation, and then the k energy storage units are directly put into discharge operation without considering other units; if k is less than n, the rest n-k gravity energy storage units can be temporarily disconnected with an alternating current bus of the power grid, so that the rest n-k gravity energy storage units work in an energy holding state;
(3) If it is not
The n gravity energy storage units of the direct current bus which is currently connected to the power grid can not complete the discharge task when being operated in a combined mode, and other gravity energy storage units are required to be connected to supplement the power grid; the number l of the accessed energy storage units;
the number l of the accessed energy storage units is obtained by calculation according to a formula (10);
j is also the sequence number of the gravity energy storage unit and is set for distinguishing from i;
namely, according to the sequence of the formula (6), the gravity energy storage units are sequentially accessed from large to small until the formula (10) is met, and the number l of the accessed energy storage units is obtained.
The seventh embodiment: in this embodiment, when the gravity energy storage matrix system enters the charging state in the step eight, the weight 1 of each gravity energy storage unit is at a low position, and no energy is stored; at the moment, the new energy station firstly carries out initialization charging on the gravity energy storage matrix system; during the initial charging process, the gravity energy storage matrix system stores 90% of the energy.
In this embodiment, the charging control strategy is similar to the discharging strategy, and according to the control method described in the sixth embodiment, the operating states of the gravity energy storage units are sequentially determined, and the system charging power is proportionally distributed to the energy storage units.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. A coordination control method for a gravity energy storage matrix system of a new energy plant station is characterized by comprising the following steps:
step one, judging the running state of a gravity energy storage matrix system; if the gravity energy storage matrix system is in an overcharged state, executing a second step; if the gravity energy storage matrix system is in an over-discharge state, executing a third step; otherwise, if the gravity energy storage matrix system is in a safe operation state, executing the ninth step;
step two, improving an active power reference value exchanged between the gravity energy storage matrix system and the new energy plant station alternating current bus, and executing step four;
step three, reducing an active power reference value exchanged between the gravity energy storage matrix system and the new energy station alternating current bus, and executing step five;
step four, judging whether the active power reference value exchanged between the improved gravity energy storage matrix system and the new energy plant station alternating-current bus reaches the rated output power of the new energy plant station or not; if the rated output power of the new energy plant station is reached, executing a sixth step; if the rated output power of the new energy plant station is not reached, executing a seventh step;
judging whether the active power reference value exchanged between the reduced gravity energy storage matrix system and the new energy plant station alternating-current bus reaches the rated output power of the new energy plant station or not; if the rated output power of the new energy plant station is not reached, executing a sixth step; if the rated output power of the new energy plant station is reached, executing the step eight;
step six, disconnecting the gravity energy storage matrix system from the new energy plant station, and executing step nine;
step seven, the gravity energy storage matrix system enters a discharging state, and step nine is executed;
step eight, the gravity energy storage matrix system enters a charging state, and step nine is executed;
and step nine, finishing the coordination control on the gravity energy storage matrix system.
2. The method according to claim 1, wherein the gravity energy storage matrix system in the first step belongs to an energy storage mechanism in an integrated connection network topology of the new energy plant;
the integrated connection network topology structure also comprises an inverter and a bidirectional converter;
electric energy generated by a wind turbine generator or photovoltaic power generation is connected to a new energy plant station alternating current bus through an inverter; the gravity energy storage matrix system is connected with an alternating current bus of the new energy plant station in parallel through a bidirectional converter.
3. The coordination control method for the gravity energy storage matrix system of the new energy plant station according to claim 2, wherein the gravity energy storage matrix system comprises a plurality of gravity energy storage units;
each gravity energy storage unit comprises a weight (1), a transmission mechanism (2), a power generation and electric integrated machine (3), power electronic equipment (4) and a support body (5);
the weight (1), the transmission mechanism (2), the power generation and electric integration machine (3) and the power electronic equipment (4) are respectively arranged on the support body (5);
the weight (1) is connected to a rotating shaft of the power generation and electric integrated machine (3) through a transmission mechanism (2) in the vertical direction; the power input and output end of the power generation and electric integrated machine (3) is connected with the power input and output end of the power electronic equipment (4).
4. The coordination control method for the gravity energy storage matrix system of the new energy plant according to claim 3, wherein the energy stored by the gravity energy storage unit is:
E cun ＝mgh max (1)
wherein E is cun Energy stored for the gravity energy storage unit; m is the mass of the weight (1); g is the acceleration of gravity; h is max Is the upper limit of the vertical height of the weight (1);
the energy released by the gravity energy storage unit is as follows:
E valid ＝mgh max -h min (2)
wherein, E valid The energy released by the gravity energy storage unit; h is a total of min Is the lower limit of the vertical height of the weight (1).
5. The method according to claim 4, wherein the calculation method of the active power reference value exchanged between the gravity energy storage matrix system and the new energy plant ac bus mentioned in the second step or the third step is:
P CH ＝P REF -P WS (3)
wherein, P CH The active power reference value is exchanged between the gravity energy storage matrix system and the new energy station alternating current bus; p is REF A total power reference value which is output to an alternating current bus of a power grid by the combination of the new energy plant station and the gravity energy storage system; p is WS The active power actually sent out for the new energy plant station;
the calculation formula of the active power actually generated by the energy plant station is shown as a formula (4);
P WS ＝P OUT -P G (4)
wherein, P OUT Actual active power output to an alternating current bus of a power grid is combined by the new energy plant and the gravity energy storage matrix system; p is G For the actual output active power of the gravity energy storage matrix system, and if P G Is negative, representing a state of charge of the gravity energy storage matrix system, if P G Is a positive value, representing that the gravity energy storage matrix system is in a discharging state.
6. The coordination control method for the gravity energy storage matrix system of the new energy plant station according to claim 5, characterized in that in the seventh step, when the gravity energy storage matrix system enters a discharging state, the weights (1) in the energy storage units are sequentially put down, and the weights (1) drag the power generation and electric integrated machine (3) to generate power; supposing that the gravity energy storage matrix system consists of m gravity energy storage units, at a certain initial discharging moment, n gravity energy storage units work in a charging mode of a previous stage and are connected to an alternating current bus of a power grid; if the maximum output power of the n gravity energy storage units is ranked as:
P max1 ＞P max2 ＞…＞P maxn (5)
wherein, P max1 Representing the maximum output power of the first gravity energy storage unit; p is max2 Representing the maximum output power of the second gravity energy storage unit; p maxn Representing the maximum output power of the nth gravity energy storage unit;
then, the maximum output power of the m-n energy storage units not connected to the ac bus of the power grid is ranked as:
P max(n+1) ＞P max(n+2) ＞…＞P maxm (6)
wherein, P max(n+1) Representing the maximum output power of the (n + 1) th gravity energy storage unit; p is max(n+2) The maximum output power of the (n + 2) th gravity energy storage unit is represented; p is maxm Representing the maximum output power of the mth gravity energy storage unit;
aiming at different working conditions, the gravity energy storage matrix power is distributed in a proportion mode as follows:
(1) If it is used
P CH ＜P max1 (7)
If the current discharging task is finished independently, the first gravity energy storage unit finishes the discharging task, and other gravity energy storage units are temporarily disconnected from the alternating current bus of the power grid;
(2) If it is used
Wherein i is the sequence number of the gravity energy storage unit; k is the number of the introduced gravity energy storage units; the k gravity energy storage units finish the discharge task through combined operation, and the k energy storage units are directly put into discharge operation without considering other units; if k is less than n, temporarily cutting off the connection between the rest n-k gravity energy storage units and an alternating current bus of a power grid, and enabling the rest n-k gravity energy storage units to work in an energy holding state;
(3) If it is used
The n gravity energy storage units of the direct current bus which is currently connected to the power grid can not complete the discharge task when being operated in a combined mode, and other gravity energy storage units are required to be connected to supplement the power grid; the number l of the accessed energy storage units;
the number l of the energy storage units which are accessed again is obtained by calculation through a formula (10);
j is also the sequence number of the gravity energy storage unit and is set for distinguishing from i;
namely, according to the sequence of the formula (6), the gravity energy storage units are sequentially accessed from large to small until the formula (10) is met, and the number l of the accessed energy storage units is obtained.
7. The coordination control method for the gravity energy storage matrix system of the new energy plant station according to claim 6, wherein in the eighth step, when the gravity energy storage matrix system enters a charging state, the weight 1 of each gravity energy storage unit is in a low position, and no energy is stored; at the moment, the new energy station firstly carries out initialization charging on the gravity energy storage matrix system; during the initial charging process, the gravity energy storage matrix system stores 90% of the energy.
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