CN117595331B - Gravity energy storage multi-unit power flexible compensation method - Google Patents
Gravity energy storage multi-unit power flexible compensation method Download PDFInfo
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- CN117595331B CN117595331B CN202410071227.9A CN202410071227A CN117595331B CN 117595331 B CN117595331 B CN 117595331B CN 202410071227 A CN202410071227 A CN 202410071227A CN 117595331 B CN117595331 B CN 117595331B
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- 238000004146 energy storage Methods 0.000 title claims abstract description 98
- 230000005484 gravity Effects 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000000737 periodic effect Effects 0.000 claims description 5
- 238000012935 Averaging Methods 0.000 claims description 2
- 238000009499 grossing Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 9
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
- G06F17/11—Complex mathematical operations for solving equations, e.g. nonlinear equations, general mathematical optimization problems
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- 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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Abstract
The invention provides a gravity energy storage multi-unit power flexible compensation method, which belongs to the field of energy storage and comprises the following steps: determining the power characteristic of a single unit under the ideal working condition; calculating power curves of different units by a power crossing time average arrangement method, and calculating and determining an overall power curve; the overall power curve is averaged and the power fluctuation component is extracted. The invention performs power smoothing on the multi-unit gravity energy storage systems with different power output characteristics, and realizes the controllability and schedulability of the whole power output of the gravity energy storage system.
Description
Technical Field
The invention belongs to the field of energy storage, and particularly relates to a gravity energy storage multi-unit power flexible compensation method.
Background
The gravity energy storage system with the common operation of the units is characterized in that each unit has a respective power operation curve, so that the aggregate operation of the units is realized, the power is smooth and controllable, and the key of solving whether the gravity energy storage power station can be scheduled or not is solved. However, in shafts or other forms of gravitational energy storage of multi-unit operation, there are acceleration, deceleration and replacement of weights, and thus, intermittent and fluctuating output power. How to stabilize intermittent power and fluctuating power is a key for realizing power smoothing, in the prior art, intermittent power for smoothing gravity energy storage such as flywheel energy storage, lithium battery energy storage and the like exists, and although the problem of power smoothing is solved to a certain extent by the methods, namely, a power curve of gravity energy storage is smoothed by the energy storage of other forms, the running cost of a system is greatly increased.
Disclosure of Invention
In order to solve the technical problems, the invention provides the gravity energy storage multi-unit power flexible compensation method, which realizes the smooth output of the power of the gravity energy storage unit cluster by the coordination of power adjustment of different units, does not need the input of additional energy storage in other forms, and is beneficial to reducing the overall cost of the system.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a gravity energy storage multi-unit power flexible compensation method comprises the following steps:
step (1) determining the power characteristics of a single gravity energy storage unit under ideal working conditions;
step (2) calculating power curves of different gravity energy storage units by a power crossing time average arrangement method, and calculating and determining an overall power curve;
step (3) averaging the whole power curve and extracting a power fluctuation component;
and (4) evenly distributing the power fluctuation components to different single gravity energy storage units, and determining a power curve of the single gravity energy storage unit, thereby realizing the power controllability and schedulability of the gravity energy storage power station.
Further, the step (2) comprises calculating the power of the nth gravity energy storage unit：
，
Wherein,the number of the gravity energy storage units is +.>Is the period of the power curve of a single gravity energy storage unit,and the power of the first gravity energy storage unit is represented, and t is time.
Further, the step (3) includes:
calculating the overall power under ideal conditions：
，
Wherein,i=1, 2 … … n, which is the power of the nth gravity energy storage unit;
for the whole power under ideal conditionTaking the period average value to obtain the overall power average value：
，
Calculating the power fluctuation component：
。
Further, the step (4) comprises calculating the power fluctuation born by each gravity energy storage unit：
，
After power fluctuation distribution, the power of each gravity energy storage unitThe method comprises the following steps:
，
wherein,the power curve of each gravity energy storage unit corresponding to the power flexible compensation method of the multiple units is adopted.
The beneficial effects are that:
in the prior gravity energy storage system, the power has periodic fluctuation, and the power demand of the power grid on the energy storage system can not be met. In order to stabilize the fluctuation power of gravity energy storage, some schemes compensate the periodic fluctuation of gravity energy storage by adding other power type energy storage, such as a battery, a super capacitor or flywheel energy storage, and the like, thereby increasing the cost of the system, improving the complexity of the system and the difficulty of control, and reducing the reliability of the system. The invention realizes the smooth power output of the gravity energy storage unit cluster, does not need the input of additional other forms of energy storage, but realizes the stable power output of the whole gravity energy storage system through the flexible power compensation of a plurality of gravity energy storage units, meets the power adjustable and schedulable requirements of a power grid on the energy storage system, is beneficial to reducing the overall cost of the gravity energy storage system, reduces the complexity of the system and improves the reliability of the system.
Drawings
FIG. 1 is a schematic diagram of power characteristics and state naming of a single gravity energy storage unit;
FIG. 2 is a schematic diagram of overall power after power crossing of multiple gravity energy storage units;
FIG. 3 is a schematic power diagram of a single unit;
FIG. 4 is a schematic diagram of four unit power crossings;
FIG. 5 is a schematic diagram of the power of the first unit after the flexibility compensation;
FIG. 6 is a schematic diagram of the power of the second unit after the flexible compensation;
FIG. 7 is a schematic diagram of the power of the third unit after the flexibility compensation;
FIG. 8 is a schematic diagram of the fourth unit power after flexible compensation;
fig. 9 is a schematic diagram of the power and overall power of the four units after the flexible compensation.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The invention performs power smoothing on the multi-unit gravity energy storage systems with different power output characteristics, and realizes the controllability and schedulability of the whole power output of the gravity energy storage system. The power characteristics of a single gravity energy storage unit have periodicity and intermittence, as shown in fig. 1, and the smoothing of the whole output power can be realized through the power intersection of a plurality of gravity energy storage units, as shown in fig. 2. The definition of power crossover is: the output characteristic of each gravity energy storage unit is a power fluctuation curve which periodically changes along with time, the fluctuation power of the gravity energy storage units is crossed but not simultaneously, by changing the time sequence of the periodic output of the gravity energy storage units, the power fluctuation of the gravity energy storage units can be stabilized, and the power smoothing method is defined as power crossing.
In an ideal state, when the period of the power curve of each gravity energy storage unit is an integral multiple of the flat bottom power time, the flat bottom powers of different gravity energy storage units are arranged in a crossing way and are evenly arranged in time, so that the total power of the gravity energy storage units can be constant. Flat bottom power is defined as the power at which the gravitational stored power output is lowest, and is typically tailored and lasts for a period of time that is the flat bottom power time. However, the condition that the period of the single gravity energy storage unit is an integral multiple of the flat bottom power time cannot be satisfied in more times because it is difficult to completely satisfy the conditions when designing the number of gravity energy storage units and the power operation curve of the single gravity energy storage unit. In addition, the maintenance and variable-working-condition operation of the gravity energy storage unit can change the overall schedulable power, so that the power characteristic of a single unit is changed, different units are generally subjected to flat-bottom power cross arrangement, and the gravity energy storage overall power still has larger fluctuation by adopting a time average arrangement method.
The invention adopts a gravity energy storage multi-unit power flexible compensation method to solve the problems, and specifically comprises the following steps:
step (1) determining the power characteristics of a single gravity energy storage unit under ideal working conditions:
the power of the first unit is shown, and t is time as shown in fig. 1. The acceleration phase, deceleration phase, power period, average power and steady state operating power are shown in fig. 1.
And (2) calculating power curves of different gravity energy storage units by a power crossing time average arrangement method, and calculating and determining an overall power curve.
，
Wherein,the number of the gravity energy storage units is +.>For the power of the nth gravity energy storage unit, < >>Is the period of the power curve of a single gravity energy storage unit.
Step (3) averages the overall power curve and extracts the power fluctuation component.
，
Wherein,for the power of the nth gravity energy storage unit, i=1, 2 … … n, +.>Taking the periodic average value of the integral power under ideal conditions to obtain the integral power average value +.>：
，
Calculating the power fluctuation component：
，
And (4) evenly distributing the power fluctuation components to different single gravity energy storage units, and determining the power curve of the single gravity energy storage unit.
，
Wherein,the power born by each gravity energy storage unit fluctuates. After power distribution by power fluctuation, the power of each gravity energy storage unit is +>The method comprises the following steps:
，
wherein,the power curve of each gravity energy storage unit corresponding to the power flexible compensation method of the multiple units is adopted. Therefore, the power of the gravity energy storage power station is controllable and schedulable.
Specifically, taking the case of four units as an example, the invention comprises:
step (1) determines the power characteristics of a single gravity energy storage unit under ideal working conditions, as shown in fig. 3.
And (2) calculating power curves of different gravity energy storage units by a power crossing time average arrangement method, and calculating and determining an overall power curve. As shown in fig. 4, it can be seen that after the power of 4 different gravity energy storage units is output in a crossing manner, the total power output of the four gravity energy storage units still has power fluctuation.
Step (3) averages the overall power curve and extracts the power fluctuation component.
And (4) evenly distributing the power fluctuation component to different single gravity energy storage units, and determining the power curve of each single gravity energy storage unit. As shown in fig. 5-8, it can be seen that, compared with fig. 3, each gravity energy storage unit contains a certain power fluctuation component, and after compensation, the total power output of the four gravity energy storage units is a constant value, as shown in fig. 9.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (1)
1. The gravity energy storage multi-unit power flexible compensation method is characterized by comprising the following steps of:
step (1) determining the power characteristics of a single gravity energy storage unit under ideal working conditions;
step (2) calculating power curves of different gravity energy storage units by a power crossing time average arrangement method, calculating and determining an overall power curve, wherein the step comprises the following steps:
calculating the power of the nth gravity energy storage unit：
，
Wherein,the number of the gravity energy storage units is +.>For the period of the power curve of a single gravity energy storage unit, < >>The power of the first gravity energy storage unit is represented, and t is time;
step (3) of averaging the overall power curve and extracting a power fluctuation component, comprising:
calculating the overall power under ideal conditions：
，
Wherein,i=1, 2 … … n, which is the power of the nth gravity energy storage unit;
for the whole power under ideal conditionTaking the periodic average value to obtain the whole power average value +.>：
，
Calculating the power fluctuation component：
；
Step (4) evenly distributing the power fluctuation components to different single gravity energy storage units, and determining the power curve of the single gravity energy storage unit so as to realize the controllable and schedulable power of the gravity energy storage power station, including calculating the power fluctuation born by each gravity energy storage unit：
，
After power fluctuation distribution, the power of each gravity energy storage unitThe method comprises the following steps:
，
wherein,the power curve of each gravity energy storage unit corresponding to the power flexible compensation method of the multiple units is adopted.
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