CN117639015B - Linear motor gravity energy storage device for waste mine and multi-energy storage block cooperative control method thereof - Google Patents
Linear motor gravity energy storage device for waste mine and multi-energy storage block cooperative control method thereof Download PDFInfo
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Abstract
The invention discloses a linear motor gravity energy storage device for a waste mine and a multi-energy storage block cooperative control method thereof, wherein weight blocks are made of concrete, so that the cost is effectively reduced; the novel linear motor adopts the double-sided sectional secondary linear switch reluctance motor and has the advantages of low cost, safety, reliability, low control difficulty, high efficiency, simple manufacture and the like. Meanwhile, a plurality of groups of energy storage block devices are coaxially configured, so that space resources are fully utilized; the control strategy adopts the cooperative control of a plurality of energy storage blocks, and the distributed cooperative algorithm is applied to realize the cooperative work among a plurality of sub controllers so as to flexibly adjust the running states of the energy storage blocks and jointly realize the aim of the system. The invention not only reduces the total cost and the construction difficulty, but also improves the safety and the reliability of the device, optimizes the overall energy storage efficiency and the control precision, and breaks through the limit of single-power-level power generation.
Description
Technical Field
The invention belongs to the technical field of gravity energy storage, and particularly relates to a novel linear motor gravity energy storage device for a waste mine and a multi-energy storage block cooperative control method thereof.
Background
With the rapid expansion of renewable energy sources, global power production is also continually rising. However, new energy systems with wind and solar energy as the core have difficulty providing stable power for constantly changing grid demands due to their high cost, large fluctuations and intermittent power supply. To address these issues, and to reduce the impact on renewable energy stability when accessing the grid, the development of energy storage technologies has become critical. Among them, mechanical energy storage is the key point of research because of its advantages of high power, high energy density and no environmental pollution. Although the water pumping energy storage and the gravity energy storage are the main flow forms of mechanical energy storage, the water pumping energy storage is not widely adopted due to the severe site selection requirements and the like. Gravity energy storage technologies, such as mountain areas, mines, railways, pistons, and tower cranes, have been attracting attention due to their high reliability, environmental protection, and long-term storage capacity. In addition, china greatly advances energy low-carbon transformation and supply guarantee, quickens the adjustment of an energy system to adapt to the large-scale development of new energy, the number of abandoned mines is increased year by year, tens of thousands of mines are abandoned at present, a green development mode is promoted to be formed for realizing the secondary utilization of the abandoned mines, and the gravity energy storage technology has wide application prospect in combination with the mine type gravity energy storage of the abandoned mines, and is considered to be the technology most suitable for large-scale application due to the advantages of small occupied area, high energy conversion efficiency, large energy storage capacity and the like. However, the conventional mine gravity energy storage system still has the problems of potential safety hazard, low efficiency and the like if a rotating motor and a traction system are used.
On the basis, the disclosed China patent-a gravity energy storage device based on a permanent magnet linear motor and a control method (CN 114665612A) provide a gravity energy storage device of the permanent magnet linear motor applied to a gravity energy storage system, but the permanent magnet linear motor is adopted in a high-temperature and high-humidity environment such as a waste mine, so that the problems of demagnetization and heat dissipation are solved, the safety and the reliability cannot be ensured, a linear switch reluctance motor can be adopted to replace the problem, the permanent magnet is not arranged in the linear switch reluctance motor, the demagnetization influence is avoided, and the advantages of low cost, low control difficulty, high safety and reliability, high efficiency and the like are also possessed; in addition, the moving part of the gravity energy storage device in the patent of the invention comprises a mover which is empty or one or more weight blocks are mounted below the mover by a rigid connecting piece, in the high-speed movement, if the rigid connecting piece deforms, the weight blocks are unbalanced, so that accidents occur, and the device can only meet single-power generation at the same time, and has limitations; and the patent does not consider that when one side of the linear motor fails, the other side of the linear motor cannot continue to complete work due to normal force problems and is accompanied by significant safety problems.
Disclosure of Invention
Aiming at the technical problems, the invention provides a novel linear motor gravity energy storage device for a waste mine and a multi-energy storage block cooperative control method thereof, and the system has the advantages of low cost, high control accuracy, high safety and reliability, simple structure, excellent energy storage and power generation efficiency and secondary utilization of waste mine resources. Through the cooperative control of a plurality of energy storage blocks, a plurality of groups of energy storage blocks can be flexibly controlled, various power demands of a power grid are met, and the limitation of power generation limited by a single power level is overcome.
The invention is realized according to the following technical scheme:
In a first aspect, the invention discloses a linear motor gravity energy storage device for a waste mine, comprising: the device comprises a linear motor, a weight block, a linear motor controller, a pantograph, a master controller, a measuring and communication module, a power grid or other energy storage equipment, an AC-DC bidirectional converter, a frame mechanism, a vertical cable, a brake, a slide rail and a power converter;
the weight is arranged on a sliding rail positioned at the center of the gravity energy storage device, and can move on the sliding rail;
The linear motor adopts a bilateral segmentation secondary linear switch reluctance motor and is of a long secondary structure; the primary of the linear motor is arranged on the weight block and forms an energy storage block with the weight block; the secondary of the linear motor is arranged on a frame mechanism of the gravity energy storage device;
the exciting winding is arranged on the primary yoke part of the linear motor and is used for conveying electric energy through the pantograph by the power converter;
The outer side of the linear motor is vertically provided with a vertical cable which has the same height as the frame mechanism, an excitation winding of the linear motor is connected with the vertical cable through a pantograph by a power converter, and the vertical cable is also connected with a master controller;
the master controller is connected with the AC-DC bidirectional converter, so that the exciting winding is ensured to form a circuit path with a power grid or other energy storage equipment through the pantograph, the vertical cable, the master controller and the AC-DC bidirectional converter by the power converter;
The total controller regulates the transmission of electric energy by controlling the AC-DC bidirectional converter, and performs cooperative control on all the energy storage blocks according to the valley time power demand/peak time power level at the power grid side and the received energy storage block detection signals, and transmits control signals to each linear motor controller so as to control the running state of each energy storage block.
In some embodiments, the primary is a double-sided salient pole belt pole shoe structure and the secondary is a segmented trapezoidal structure; the exciting winding adopts a centralized winding.
In some embodiments, the energy storage blocks comprise at least 2, and a plurality of energy storage blocks are uniformly mounted on one sliding rail, so that the vertical movement and cooperative control of the plurality of energy storage blocks on the same axis are achieved;
In some embodiments, the multiple sets of primary sides of the weight are arranged in parallel; the energy storage blocks can be formed by adopting a weight block single-side installation primary group, or two-side installation primary groups, or three-side installation primary groups, or surrounding installation primary groups.
In some embodiments, the AC-DC bi-directional converter has the function of converting AC power to DC power and vice versa; when the energy storage block generates power, the energy storage block generates direct current, and the direct current is controlled by the master controller and is connected with the grid through the inversion function of the AC-DC bidirectional converter; when the energy storage block stores energy, the power grid outputs direct current to each linear motor through the rectification function of the AC-DC bidirectional converter and the total controller.
In some embodiments, the measurement and communication module comprises:
A position sensor for detecting a position of the primary portion;
the current sensor is used for detecting exciting current of the linear motor;
The voltage sensor is used for detecting voltage;
And the wireless communicator is used for transmitting signals acquired from the position sensor, the current sensor and the voltage sensor and residual electric energy signals of the storage battery to the main controller and the linear motor controller, and receiving control instructions from the main controller to the linear motor controller and the brake.
In some embodiments, the power converter, linear motor controller, brake, and measurement and communication module are integrated on the energy storage block.
In some embodiments, the power converter employs an asymmetric half-bridge converter, such that each phase is sequentially turned on to ensure stable operation of the linear motor.
In a second aspect, the invention also discloses a multi-energy-storage-block cooperative control method based on the linear motor gravity energy storage device for the waste mine, wherein the multi-energy-storage-block cooperative control adopts a distributed cooperative algorithm for realizing cooperative work among a plurality of linear motor controllers;
in normal operation, two states of power generation and energy storage are cooperated by a plurality of energy storage blocks;
When the multiple energy storage blocks work cooperatively in a power generation mode, the master controller monitors the running states of all the energy storage blocks; based on the power demand of the power grid side, the master controller adjusts and distributes the running speed of each energy storage block, and then transmits a speed signal to each linear motor controller; the linear motor controller performs double closed-loop control according to the speed signal and the primary position signal received from the overall controller, converts gravitational potential energy into electric energy, and transmits the electric energy to a power grid or other energy storage equipment through an AC-DC bidirectional converter;
When the multiple energy storage blocks work cooperatively in an energy storage mode, the master controller sequentially sends speed signals to the linear motor controllers from top to bottom according to the linear motor, after receiving the speed signals and the primary position signals, the linear motor controllers implement double closed-loop control to ensure that electric energy from a power grid or other energy storage equipment is transmitted to the linear motor through the AC-DC bidirectional converter, and the linear motor converts the electric energy into gravitational potential energy for storage.
In some embodiments, the specific steps of M (M.gtoreq.2) energy storage blocks working cooperatively in the power generation mode are as follows:
step one: the power grid side is in a valley state, the required electric power value of the power grid side is set to be a fixed value, and the weights of the two energy storage blocks are consistent;
Step two: calculating the running speed of a single energy storage block according to the electric power value required by the power grid side, and inputting the control signal to a corresponding linear motor controller by a master controller to control the energy storage block to be accelerated to be lowered to a designated speed and start to run at a constant speed;
Step three: when the M-1 energy storage block also enters a power generation mode, the electric power value in the first step is constant;
Step four: when the M-1 energy storage block receives a speed control signal of the overall controller and enters acceleration and descent, the uniform running speed of the first energy storage block starts to descend so as to ensure that the overall output power is constant;
step five: when the M-1 energy storage block and the first energy storage block respectively accelerate to descend and decelerate to descend to the same speed and start to run at a constant speed, keeping constant and stable output of output power so as to meet the requirement of the step one;
Step six: when the electric power value in the first step is increased to another fixed value and is in the second state;
Step seven: the M energy storage blocks of the required electric power respectively bear 1/N and run at another required speed at the same time, the first energy storage block accelerates/decelerates to the speed, the M-1 energy storage block enters the process of accelerating and descending and reaches the speed to start to run at a constant speed, and finally the total output power is ensured to be consistent with the step six;
step eight: when the electric power of the first step rises to another fixed value and is in the fifth state;
step nine: the M energy storage blocks of the required electric power respectively bear 1/M, namely, simultaneously run at another required speed, the speeds of the M energy storage blocks are accelerated from the speed of the step five running at a constant speed to the required speed to start running at a constant speed, and finally, the total output power is ensured to be consistent with the step eight;
step ten: when the position detector detects that the energy storage block reaches a specified position, the master controller controls the energy storage block to enter deceleration braking and finally drop to zero;
the specific steps of the energy storage block under the energy storage mode are as follows:
Step one: the power grid side is in a peak value state, the weight of each energy storage block is consistent, the operation efficiency is required to be higher, and the total controller sets a speed to meet the high efficiency requirement;
step two: the energy storage blocks rise to the speed signals input to the linear motor controller by the master controller sequentially from top to bottom through acceleration;
Step three: and the energy storage block enters a stage of uniform speed rising, and when the position detector detects that the energy storage block reaches a specified position, the master controller controls the energy storage block to enter deceleration braking and finally drops to zero.
Compared with the technology studied at present, the invention has the advantages that:
(1) According to the invention, the waste mine resources are secondarily utilized and combined with the gravity energy storage technology, and the weight blocks are made of concrete, so that the cost is effectively reduced;
(2) The linear motor adopts the double-sided sectional secondary linear switch reluctance motor and has the advantages of low cost, safety, reliability, low control difficulty, high efficiency and simple manufacture; the motor winding is wound on the primary yoke part, so that copper consumption can be reduced to reduce cost; the bilateral structure counteracts the influence of a single-side normal force, and when one side of the linear motor fails, the linear motor can still safely and stably run; the flexible installation and configuration of the energy storage block can be realized by the operation of motors on one side, two sides, three sides and four sides so as to realize more working modes. Meanwhile, a plurality of groups of energy storage blocks are coaxially configured, so that space resources are fully utilized;
(3) The invention adopts the cooperative control of a plurality of energy storage blocks, and the distributed cooperative algorithm is applied to realize the cooperative work among a plurality of sub controllers so as to flexibly adjust the running states of the energy storage blocks and jointly realize the aim of the system. In the power generation mode, the operation speed of each energy storage block is flexibly adjusted according to the power class requirement of the power grid. Each motor controller receives the speed and position signals, performs double closed-loop control, converts gravitational potential energy into electric energy, and transmits the electric energy to a power grid or other energy storage equipment through an AC-DC bidirectional converter; in the energy storage mode, a speed signal is sent to each linear motor controller on a top-down basis. The design not only reduces the total cost and the construction difficulty, but also optimizes the overall energy storage efficiency and the control precision, and breaks through the limit of single-power-level power generation.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. It is evident that the drawings in the following description are only examples, from which other drawings can be obtained by a person skilled in the art without the inventive effort.
In the drawings:
fig. 1 is a schematic diagram of the overall structure of a gravity energy storage device (including a front view and a left view) of a linear motor according to an embodiment of the invention.
Fig. 2 is a schematic structural diagram of a linear motor in the gravity energy storage device of the linear motor according to an embodiment of the invention.
Fig. 3 is a top view illustrating an arrangement of linear motors in an energy storage block according to an embodiment of the present invention.
Wherein, 1-linear motor; 2-weight blocks; 3-a linear motor controller; 4-pantograph; 5-a master controller; 6-a measurement and communication module; 7-a power grid or other energy storage device; an 8-AC-DC bi-directional converter; 9-a frame mechanism; 10-vertical cable wires; 11-a brake; 12-sliding rails; 13. 19, 20, 23-linear motor primary; 14. 21, 22, 24-linear motor secondary; 16-exciting winding; 17-a power converter; 18-fixing piece.
It should be noted that these drawings and the written description are not intended to limit the scope of the inventive concept in any way, but to illustrate the inventive concept to those skilled in the art by referring to the specific embodiments.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention, and the following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1 and fig. 2, the disclosed embodiment provides a gravity energy storage device of a linear motor for waste mines, which aims at the current waste of tens of thousands of mines caused by energy structure adjustment in China, and combines the gravity energy storage device with a gravity energy storage technology to form a mine type gravity energy storage system so as to promote the formation of a green development mode. The device comprises a linear motor 1, a weight 2, a linear motor controller 3, a pantograph 4, a general controller 5, a measuring and communication module 6, a power grid or other energy storage equipment 7, an AC-DC bidirectional converter 8, a frame mechanism 9, a vertical cable 10, a brake 11, a slide rail 12 and a power converter 17; the weight 2 is arranged on a slide rail 12 positioned in the center of the gravity energy storage device, and the weight 2 can move on the slide rail; the linear motor adopts a unilateral segmentation secondary linear switch reluctance motor and is of a long secondary structure; the primary 13 of the linear motor 1 is arranged on the weight 2 and forms an energy storage block with the weight 2; the secondary 14 of the linear motor is arranged on the frame mechanism 9 of the gravity energy storage device; the exciting winding 16 is arranged on the primary yoke of the linear motor 1, and transmits electric energy through the pantograph 4 by a power converter 17; a main controller 5 and an AC-DC bidirectional converter 8 are arranged at the top of the abandoned mine, a vertical cable 10 with the same height as a frame mechanism 9 is vertically arranged at the outer side of the linear motor 1, an excitation winding 16 of the linear motor is connected with the vertical cable 10 through a pantograph 4 by a power converter 17, and the vertical cable 10 is also connected with the main controller 5; the master controller 5 is connected with the AC-DC bidirectional converter 8, so that the excitation winding 16 is ensured to form a circuit path with a power grid or other energy storage equipment through the pantograph 4, the vertical cable 10, the master controller 5 and the AC-DC bidirectional converter 8 by the power converter 17; the master controller 5 adjusts the transmission of electric energy by controlling the AC-DC bidirectional converter 8, and according to the valley-time power demand/peak-time power level at the power grid side and the received energy storage block detection signals, the master controller 5 performs cooperative control on all the energy storage blocks, and the master controller transmits control signals to each linear motor controller, so that the running state of each energy storage block is controlled.
Further, the primary 13 is of a double-sided salient pole belt pole shoe structure, and the secondary 14 is of a segmented trapezoid structure; the field winding 16 is a concentrated winding. The weight 2 is made of concrete to save the construction cost of the device.
Further, the energy storage blocks comprise at least 2, and the plurality of energy storage blocks are uniformly arranged on one sliding rail, so that the vertical movement and cooperative control of the plurality of energy storage blocks on the same axis are realized;
Further, the weight 2 is provided with a plurality of groups of primary parallel arrangement on each side; the energy storage blocks can be formed by adopting a weight block 2 to be provided with primary groups on one side, or two sides or three sides, or surrounding the primary groups.
Specifically, as shown in fig. 1 and 3, a plurality of energy storage blocks are uniformly mounted on one slide rail 12, so that flexible vertical movement and cooperative control of the plurality of energy storage blocks on the same axis are achieved, and a certain safety distance exists between the energy storage blocks. The weight 2 has primary 20, primary 23 mating mounts 18 arranged in parallel sequence on each side, and primary 19, 21, 22 and 24 mating mounts 18 are mounted on the frame mechanism 9, with primary and secondary parallel arrangements being seen as secondary 19, primary 20, secondary 21, secondary 22, primary 23 and secondary 24 arranged in sequence; the energy storage blocks can be formed by matching the weight blocks 2 on the single side primary 20 and 23, or by installing the weight blocks 2 on the primary group on two sides, or installing the weight blocks 2 on the primary group on three sides, or installing the weight blocks 2 on the primary group around.
Further, the AC-DC bidirectional converter 8 has a function of converting AC power into DC power and converting DC power into AC power; when the energy storage block generates power, the energy storage block generates direct current, and the direct current is controlled by the master controller 5 and then grid connection is realized through the inversion function of the AC-DC bidirectional converter 8; when the energy storage block stores energy, the power grid outputs direct current to each linear motor through the total controller 6 by the rectification function of the AC-DC bidirectional converter 8.
Further, the power converter 17 adopts an asymmetric half-bridge converter, so that each phase is conducted sequentially to ensure stable operation of the linear motor.
Further, the measurement and communication module 6 includes: the device comprises a position sensor, a current sensor, a voltage sensor and a wireless communicator; a position sensor for detecting a position of the primary portion; the current sensor is used for detecting exciting current of the linear motor; the voltage sensor is used for detecting voltage; and the wireless communicator is used for transmitting signals acquired from the position sensor, the current sensor and the voltage sensor and residual electric energy signals of the storage battery to the main controller and the linear motor controller, and receiving control instructions from the main controller 5 to the linear motor controller 3 and the brake 11.
Further, as shown with reference to fig. 1 and 2, on the energy storage block, the power converter 17, the linear motor controller 3, the brake 11 and the measurement and communication module 6 have been integrated.
In one or more embodiments, there is also provided a method for cooperatively controlling multiple energy storage blocks of a linear motor gravity energy storage device for a waste mine, which adopts a distributed cooperative algorithm, and aims to realize cooperative work among multiple linear motor controllers 3 so as to flexibly adjust the running states of the energy storage blocks and jointly realize the aim of a system;
in normal operation, two states of power generation and energy storage are cooperated by a plurality of energy storage blocks;
When the multiple energy storage blocks work cooperatively in the power generation mode, the overall controller 5 monitors the running states of all the energy storage blocks. Based on the power demand on the grid side, the overall controller 5 adjusts and distributes the running speed of each energy storage block, and then transmits a speed signal to each linear motor controller 3. The linear motor controller 3 performs double closed-loop control according to the speed signal and the primary position signal received from the overall controller 5, converts gravitational potential energy into electric energy, and transmits the electric energy to a power grid or other energy storage equipment through an AC-DC bidirectional converter;
In the embodiment of the application, the specific steps of the cooperative work of the double energy storage blocks in the power generation mode are as follows:
Step one: the power grid side is in a valley state, the required electric power value of the power grid side is set to be a fixed value P 1, and the weights of the two energy storage blocks are consistent, namely F=mg (m is the weight of each energy storage block);
Step two: calculating the running speed v 1＝P1/F＝P1/mg of a single energy storage block according to the electric power value required by the power grid side, and inputting the control signal to the corresponding linear motor controller 3 by the master controller to control the energy storage block to descend from acceleration to the designated speed v 1 and start to run at a constant speed;
Step three: when the second energy storage block also enters a power generation mode, the electric power value P 1 in the first step is constant;
step four: the second energy storage block receives a speed control signal of the overall controller 5 to enter acceleration and descent, and the uniform running speed of the first energy storage block starts to descend from v 1 so as to ensure that the overall output power P 1 is constant;
Step five: the second energy storage block starts to run at a constant speed from 0 to v 2＝P1/2*F＝P1/2 mg, the first energy storage block starts to run at a constant speed from v 1 to v 2, and the output power P 1 is kept to be output at a constant speed so as to meet the requirement of the step one;
Step six: when the electric power value in the first step rises to another fixed value P 2 and is in the second state;
Step seven: the two energy storage blocks of the required electric power respectively bear half of the required electric power and run at the other required speed at the same time, the first energy storage block accelerates/decelerates to the speed, the second energy storage block enters the process of accelerating and descending and reaches the speed to start to run at a constant speed, and finally the total output power is ensured to be consistent with the step six;
Specifically, the two energy storage blocks of the required electric power respectively bear half of the required electric power and operate at the other required speed v 3＝P2/2*F＝P2/2 mg at the same time, the first energy storage block accelerates/decelerates to the speed v 3, the second energy storage block enters the process of accelerating and descending and starts to operate at a constant speed from 0 to v 3, and finally the total output power is ensured to be consistent with the step six.
Step eight: when the electric power of the first step rises to another fixed value P 3 and is in the fifth state;
Step nine: the two energy storage blocks of the required electric power respectively bear half of the required electric power, namely, simultaneously run at the other required speed v 4＝P3/2*F＝P3/2 mg, the speeds of the two energy storage blocks are accelerated from constant speed v 2 to v 4 to start to run at a constant speed, and finally, the total output power is ensured to be consistent with that of the step eight.
Step ten: when the position detector detects that the energy storage block reaches the designated position, the master controller 5 controls the energy storage block to enter deceleration braking and finally to drop to zero.
When the multiple energy storage blocks work cooperatively in the electric mode, the master controller 5 sequentially sends speed signals to the linear motor controllers 3 according to the sequence from top to bottom of the energy storage blocks. Upon receiving the speed signal and the primary position signal, each linear motor controller 3 performs double closed loop control. Ensuring that electrical energy from the grid or other energy storage device 7 is transferred to the linear motor 1 via the AC-DC bi-directional converter 8. The linear motor converts the electrical energy into gravitational potential energy for storage.
In the embodiment of the application, the specific steps of the cooperative work of the double energy storage blocks in the electric mode are as follows:
Step one: in a peak state, the weight of the double energy storage blocks is consistent, the operation efficiency is required to be higher, the total controller 5 sets a speed v 5＝P4/F＝P4/mg(v5 to be a speed meeting the high-efficiency requirement of the motor, and P 4 is the power grid side output electric power matched with the operation speed at the moment;
step two: the energy storage blocks sequentially receive the speed signals input to the linear motor controller 3 by the master controller 5 from top to bottom, and the double energy storage blocks sequentially run by ascending from 0 speed to v 5 at a constant speed;
Step three: and when the position detector detects that the energy storage block reaches a specified position, the master controller 5 inputs signals to the linear motor controller 3 and the brake 11 to control the energy storage block to enter deceleration braking and finally drop to zero.
In the embodiment of the application, the specific steps of the cooperative work of N (N > 2) energy storage blocks in the power generation mode are as follows:
Step one: the power grid side is in a valley state, the required electric power value of the power grid side is set to be a fixed value P 5, and the weights of the two energy storage blocks are consistent, namely F=mg (m is the weight of each energy storage block);
Step two: calculating the running speed v 6＝P5/F＝P5/mg of a single energy storage block according to the electric power value required by the power grid side, and inputting the control signal to the corresponding linear motor controller 3 by the master controller to control the energy storage block to descend from acceleration to the designated speed v 6 and start to run at a constant speed;
Step three: when the other N-1 energy storage blocks sequentially enter a power generation mode, the electric power value P 5 in the first step is constant;
Step four: in addition, N-1 energy storage blocks are sequentially arranged on the sliding rail, and the speed control signals of the total controller 5 are sequentially accelerated to descend, and meanwhile, the uniform speed running speed of the first energy storage block is reduced from v 6 so as to ensure that the total output power P 5 is constant;
Step five: in addition, the N-1 energy storage blocks are sequentially accelerated from 0 to v 7＝P5/N*F＝P5/N mg to start to run at a constant speed, the first energy storage block is decelerated from constant speed v 6 to v 7 and starts to run at a constant speed, and the constant and stable output of the output power P 5 is kept to meet the requirement of the step one;
Step six: when the electric power value in the first step rises to another fixed value P 6 and is in the second state;
Step seven: the N energy storage blocks of the required electric power respectively bear 1/N and run at another required speed at the same time, the first energy storage block accelerates/decelerates to the speed, in addition, the N-1 energy storage blocks are arranged on the sliding rail and sequentially enter the process of acceleration and descent and reach the speed to start to run at a constant speed, and finally, the total output power is ensured to be consistent with the step six;
Specifically, the N energy storage blocks of the required electric power respectively bear 1/N, i.e. simultaneously run at another required speed v 8＝P6/N*F＝P6/n×mg, the first energy storage block accelerates/decelerates to a speed v 8, in addition, the N-1 energy storage blocks sequentially enter the process of accelerating and descending and start to run at a constant speed from 0 to v 8, and finally, the total output power is ensured to be consistent with the step six.
Step eight: when the electric power of the first step rises to another fixed value P 7 and is in the fifth state;
Step nine: the N energy storage blocks of the required electric power respectively bear 1/N, namely, simultaneously run at the other required speed v 9＝P7/N*F＝P7/N mg, the speeds of the N energy storage blocks are accelerated from constant speed v 7 to v 9 to start constant speed running, and finally, the total output power is ensured to be consistent with that of the step eight.
Step ten: when the position detector detects that the energy storage block reaches the designated position, the master controller 5 controls the energy storage block to enter deceleration braking and finally to drop to zero.
In the embodiment of the application, the specific steps of the N energy storage blocks working cooperatively in the electric mode are as follows:
Step one: in a peak state, the weight of each energy storage block is consistent and the operation efficiency is required to be higher, the total controller 5 sets a speed v 10＝P8/F＝P8/mg(v10 to be a speed meeting the high-efficiency requirement of the motor, and P 8 is the power grid side output electric power matched with the operation speed at the moment;
Step two: the energy storage blocks sequentially receive the speed signals input to the linear motor controller 3 by the master controller 5 according to the sequence from top to bottom, and N energy storage blocks sequentially perform ascending operation from 0 speed acceleration to v 10 at a constant speed;
Step three: and when the position detector detects that the energy storage block reaches a specified position, the master controller 5 inputs signals to the linear motor controller 3 and the brake 11 to control the energy storage block to enter deceleration braking and finally drop to zero.
In summary, the invention discloses a linear motor gravity energy storage device for waste mines and a multi-energy storage block cooperative control method thereof, which aim at the current waste of tens of thousands of mines caused by energy structure adjustment in China, and in order to realize secondary utilization of waste mine resources, the waste mine resources are combined with a gravity energy storage technology to form a mine type gravity energy storage system so as to promote the formation of a green development mode. The weight blocks are made of concrete, so that the cost is effectively reduced; the linear motor adopts a double-sided sectional secondary linear switch reluctance motor and has the advantages of low cost, safety, reliability, low control difficulty, high efficiency, simple manufacture and the like; in order to reduce the cost, the exciting winding is wound on the primary yoke part of the motor so as to reduce copper loss; in order to improve the safety and reliability of the device, a bilateral structure is adopted. The flexible installation and configuration of the energy storage block can be realized by the operation of motors on one side, two sides, three sides and four sides so as to realize more working modes. Meanwhile, a multi-energy storage block cooperative control method of the device is disclosed. The invention adopts a multi-energy storage block cooperative control technology, and applies a distributed cooperative algorithm to realize cooperative work among a plurality of sub controllers so as to flexibly adjust the running states of all the energy storage blocks and jointly realize the aim of the system; when the power generation working mode is adopted, according to the power level requirements of the grid side valley time, the total controller distributes the output power of each motor and inputs signals to each linear motor controller so as to flexibly and accurately control the running speed of each energy storage block, realize the cooperative power generation running of the plurality of energy storage blocks and can meet the different power level requirements of the grid side in real time. When in an energy storage working mode, the power grid side is in a peak time state, according to the optimal running efficiency of the linear motor, the speed of each energy storage block is controlled by the master controller from top to bottom in sequence, and a speed signal is input to each linear motor controller so as to ensure the efficient running of the motor, reduce the energy loss and ensure the safety.
In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features contained in other embodiments, but not others, combinations of features of different embodiments are equally meant to be within the scope of the application and form different embodiments. For example, in the above embodiments, those skilled in the art can use the above embodiments in combination according to known technical solutions and technical problems to be solved by the present application.
The foregoing description is only illustrative of the preferred embodiment of the present invention, and is not to be construed as limiting the invention, but is to be construed as limiting the invention to any simple modification, equivalent variation and variation of the above embodiments according to the technical matter of the present invention without departing from the scope of the invention.
Claims (8)
1. A multi-energy storage block cooperative control method based on a linear motor gravity energy storage device for a waste mine is characterized by comprising the following steps of:
The linear motor gravity energy storage device for the waste mine comprises: the device comprises a linear motor, a weight block, a linear motor controller, a pantograph, a master controller, a measuring and communication module, a power grid or other energy storage equipment, an AC-DC bidirectional converter, a frame mechanism, a vertical cable, a brake, a slide rail and a power converter;
the weight is arranged on a sliding rail positioned at the center of the gravity energy storage device, and can move on the sliding rail;
The linear motor adopts a bilateral segmentation secondary linear switch reluctance motor and is of a long secondary structure; the primary of the linear motor is arranged on the weight block and forms an energy storage block with the weight block; the secondary of the linear motor is arranged on a frame mechanism of the gravity energy storage device;
the exciting winding is arranged on the primary yoke part of the linear motor and is used for conveying electric energy through the pantograph by the power converter;
The outer side of the linear motor is vertically provided with a vertical cable which has the same height as the frame mechanism, an excitation winding of the linear motor is connected with the vertical cable through a pantograph by a power converter, and the vertical cable is also connected with a master controller;
the master controller is connected with the AC-DC bidirectional converter, so that the exciting winding is ensured to form a circuit path with a power grid or other energy storage equipment through the pantograph, the vertical cable, the master controller and the AC-DC bidirectional converter by the power converter;
The total controller regulates the transmission of electric energy by controlling the AC-DC bidirectional converter, and performs cooperative control on all the energy storage blocks according to the valley time power demand/peak time power level at the power grid side and the received energy storage block detection signals, and transmits control signals to each linear motor controller so as to control the running state of each energy storage block;
the multi-energy storage block cooperative control adopts a distributed cooperative algorithm for realizing cooperative work among a plurality of linear motor controllers;
in normal operation, two states of power generation and energy storage are cooperated by a plurality of energy storage blocks;
When the multiple energy storage blocks work cooperatively in a power generation mode, the master controller monitors the running states of all the energy storage blocks; based on the power demand of the power grid side, the master controller adjusts and distributes the running speed of each energy storage block, and then transmits a speed signal to each linear motor controller; the linear motor controller performs double closed-loop control according to the speed signal and the primary position signal received from the overall controller, converts gravitational potential energy into electric energy, and transmits the electric energy to a power grid or other energy storage equipment through an AC-DC bidirectional converter;
When the multiple energy storage blocks work cooperatively in an energy storage mode, the main controller sequentially sends speed signals to the linear motor controllers from top to bottom according to the linear motor, after receiving the speed signals and the primary position signals, the linear motor controllers implement double closed-loop control to ensure that electric energy from a power grid or other energy storage equipment is transmitted to the linear motor through the AC-DC bidirectional converter, and the linear motor converts the electric energy into gravitational potential energy for storage;
the specific steps of the M energy storage blocks working cooperatively in the power generation mode are as follows, wherein M is more than or equal to 2:
Step one: the power grid side is in a valley state, the required electric power value of the power grid side is set to be a fixed value, and the weight of each energy storage block is consistent;
Step two: calculating the running speed of a single energy storage block according to the electric power value required by the power grid side, and inputting the control signal to a corresponding linear motor controller by a master controller to control the energy storage block to be accelerated to be lowered to a designated speed and start to run at a constant speed;
Step three: when the M-1 energy storage block also enters a power generation mode, the electric power value in the first step is constant;
Step four: when the M-1 energy storage block receives a speed control signal of the overall controller and enters acceleration and descent, the uniform running speed of the first energy storage block starts to descend so as to ensure that the overall output power is constant;
step five: when the M-1 energy storage block and the first energy storage block respectively accelerate to descend and decelerate to descend to the same speed and start to run at a constant speed, keeping constant and stable output of output power so as to meet the requirement of the step one;
Step six: when the electric power value in the first step is increased to another fixed value and is in the second state;
Step seven: the M energy storage blocks of the required electric power respectively bear 1/N and run at another required speed at the same time, the first energy storage block accelerates/decelerates to the speed, the M-1 energy storage block enters the process of accelerating and descending and reaches the speed to start to run at a constant speed, and finally the total output power is ensured to be consistent with the step six;
step eight: when the electric power of the first step rises to another fixed value and is in the fifth state;
step nine: the M energy storage blocks of the required electric power respectively bear 1/M, namely, simultaneously run at another required speed, the speeds of the M energy storage blocks are accelerated from the speed of the step five running at a constant speed to the required speed to start running at a constant speed, and finally, the total output power is ensured to be consistent with the step eight;
step ten: when the position detector detects that the energy storage block reaches a specified position, the master controller controls the energy storage block to enter deceleration braking and finally drop to zero;
the specific steps of the energy storage block under the energy storage mode are as follows:
Step one: the power grid side is in a peak value state, the weight of each energy storage block is consistent, the operation efficiency is required to be higher, and the total controller sets a speed to meet the high efficiency requirement;
step two: the energy storage blocks rise to the speed signals input to the linear motor controller by the master controller sequentially from top to bottom through acceleration;
Step three: and the energy storage block enters a stage of uniform speed rising, and when the position detector detects that the energy storage block reaches a specified position, the master controller controls the energy storage block to enter deceleration braking and finally drops to zero.
2. The multi-energy storage block cooperative control method according to claim 1, wherein: the primary is of a double-sided salient pole belt pole shoe structure, and the secondary is of a segmented trapezoid structure; the exciting winding adopts a centralized winding.
3. The method according to claim 1, wherein the energy storage blocks comprise at least 2 energy storage blocks, and the plurality of energy storage blocks are uniformly mounted on one sliding rail, so that vertical movement and cooperative control of the plurality of energy storage blocks on the same axis are achieved.
4. The multi-energy storage block cooperative control method according to claim 1, wherein: multiple groups of primary sides of the weight block are arranged in parallel; each energy storage block is composed of a weight block single-side installation primary group, or two-side installation primary groups, or three-side installation primary groups, or surrounding installation primary groups.
5. The multi-energy storage block cooperative control method according to claim 1, wherein: the AC-DC bidirectional converter has the functions of converting alternating current into direct current and converting direct current into alternating current; when the energy storage block generates power, the energy storage block generates direct current, and the direct current is controlled by the master controller and is connected with the grid through the inversion function of the AC-DC bidirectional converter; when the energy storage block stores energy, the power grid outputs direct current to each linear motor through the rectification function of the AC-DC bidirectional converter and the total controller.
6. The multi-energy storage block cooperative control method of claim 1, wherein the measuring and communication module comprises:
A position sensor for detecting a position of the primary portion;
the current sensor is used for detecting exciting current of the linear motor;
The voltage sensor is used for detecting voltage;
And the wireless communicator is used for transmitting signals acquired from the position sensor, the current sensor and the voltage sensor and residual electric energy signals of the storage battery to the main controller and the linear motor controller, and receiving control instructions from the main controller to the linear motor controller and the brake.
7. The method of claim 1, wherein the power converter, the linear motor controller, the brake and the measurement and communication module are integrated on the energy storage block.
8. The method according to claim 1, wherein the power converter is an asymmetric half-bridge converter, so that each phase is sequentially conducted to ensure stable operation of the linear motor.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2012201158A1 (en) * | 2006-11-17 | 2012-03-22 | Wedge Global, S.L. | Switched reluctance linear motor/generator |
| CN114665612A (en) * | 2022-04-06 | 2022-06-24 | 山东大学 | Gravity energy storage device based on permanent magnet linear motor and control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2012201158A1 (en) * | 2006-11-17 | 2012-03-22 | Wedge Global, S.L. | Switched reluctance linear motor/generator |
| CN114665612A (en) * | 2022-04-06 | 2022-06-24 | 山东大学 | Gravity energy storage device based on permanent magnet linear motor and control method |
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