Gravity energy storage system power regulation and control method and system based on load response

Abstract

The invention relates to the technical field of gravity energy storage system power regulation and control, in particular to a gravity energy storage system power regulation and control method and system based on load response, and the method comprises the steps: obtaining the load peak period, the load demand power and the peak demand electric quantity of a regional power grid, dividing a gravity energy storage period and a gravity energy release period, and obtaining the load demand power and the peak demand electric quantity in the gravity energy storage period; calculating future load electric quantity and future energy storage electric quantity, judging whether the future energy storage electric quantity is greater than the future load electric quantity or not, if so, taking the current energy storage power as target energy storage power, and if not, performing power regulation and control to obtain the target energy storage power; and constructing a falling constraint condition and an interval constraint condition according to the load peak period and the load demand power, and performing power regulation and control on the gravity energy storage system based on the target energy storage power, the falling constraint condition and the interval constraint condition. The response time of power regulation and control of the gravity energy storage system can be shortened, and energy waste in the energy supply process is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of power regulation of gravity energy storage systems, and in particular to a power regulation method, system, electronic device and computer-readable storage medium for a gravity energy storage system based on load response. Background Art

[0002] The gravity energy storage system plays an important role in helping regional power grids cope with load fluctuations. It can store electricity when there is surplus power in the regional power grid to prevent excessive waste of surplus power, and release electricity when the load demand peaks to complete the energy supply to the regional power grid. Although the gravity energy storage system can store a large amount of energy, due to its low energy conversion efficiency, it is of great significance to achieve precise control of the power of the gravity energy storage system in practical applications.

[0003] At present, the power regulation of gravity energy storage system is mainly achieved by changing the running speed of the energy storage weight. Due to the large size of gravity energy storage system, it takes a long time to change the running speed, and the response time for the regional power grid is slow. In addition, only changing the speed in the process of supplying energy to the regional power grid will cause a large waste of energy. Summary of the invention

[0004] The present invention provides a power control method for a gravity energy storage system based on load response and a computer-readable storage medium, the main purpose of which is to speed up the response time of power control of the gravity energy storage system and reduce energy waste in the energy supply process.

[0005] To achieve the above object, the present invention provides a power control method of a gravity energy storage system based on load response, comprising:

[0006] Obtaining the load peak period and load demand power of the regional power grid, and calculating the peak demand power based on the load peak period and load demand power;

[0007] The pre-constructed gravity energy storage system is divided into working stages according to the peak load period to obtain a gravity energy storage period and a gravity energy release period, wherein the gravity energy storage system includes a plurality of gravity energy storage units, and the gravity energy storage units include: energy storage weights, a transmission bottom bin, a transmission top bin, and a transmission belt;

[0008] During the gravity energy storage period, the current energy storage capacity, current energy storage power and current gravity load of the gravity energy storage system are obtained, and the future load capacity is calculated according to the peak demand capacity and the current energy storage capacity;

[0009] Calculate the future energy storage capacity of the gravity energy storage system according to the peak load period and the current energy storage power, and determine whether the future energy storage capacity is greater than the future load capacity;

[0010] If the future energy storage power is greater than the future load power, the current energy storage power is used as the target energy storage power until the gravity energy release period begins;

[0011] If the future energy storage power is not greater than the future load power, the power of the gravity energy storage system is controlled by changing the current gravity load to obtain the target energy storage power, and the target energy storage power is maintained until the gravity energy release period begins;

[0012] During the gravity energy release period, the bottom bin height of the bottom bin and the top bin height of the top bin are obtained, and the falling time of the heavy object is calculated based on the bottom bin height and the top bin height;

[0013] According to the falling time of the heavy object and the preset first falling time, the falling constraint condition of the nth falling time is constructed, and according to the load demand power and the first falling time, the interval constraint condition of the falling interval is constructed;

[0014] Based on the first falling time, falling constraints and interval constraints, a falling time set is set, and the power of the gravity energy storage system is controlled according to the falling time set, the target energy storage power and the current energy storage power.

[0015] Optionally, the calculating the peak power demand based on the load peak period and the load demand power includes:

[0016] Obtain the load peak duration of the load peak period, wherein the load peak period is expressed as:

[0017] T f =(T k T j )

[0018] Among them, T f represents the peak load period, T k Indicates the peak start time, T j Indicates the peak end time;

[0019] The peak power demand is calculated using the following formula:

[0020] W f =(T j -T k )×P f

[0021] Among them, W f Indicates the peak power demand, P f Indicates the load demand power.

[0022] Optionally, the pre-built gravity energy storage system is divided into working stages according to the load peak period to obtain a gravity energy storage period and a gravity energy release period, including:

[0023] Get the current time and set a release preparation time based on the load demand power;

[0024] According to the peak start time and the energy release preparation time of the load peak period, the actual start time is determined, wherein the actual start time is expressed as:

[0025] T a =T k -t z

[0026] Among them, T a represents the actual start time, t z Indicates the energy release preparation time;

[0027] The gravity energy storage period is determined according to the current time and the actual start time, and the gravity energy release period is determined according to the actual start time and the peak end time, wherein the gravity energy storage period and the gravity energy release stage are respectively expressed as:

[0028] T c =(T n T a ), T s =(T a T j )

[0029] Among them, T n represents the current time, T c represents the gravity energy storage period, T s Indicates the gravitational energy release period.

[0030] Optionally, the power regulation of the gravity energy storage system by changing the current gravity load includes:

[0031] The current unit load set, the weight contact area set and the unit rated speed set of multiple gravity energy storage units are obtained, wherein the current load gravity set, the weight contact area set and the current weight speed set are respectively expressed as:

[0032] G0={G 01 , …, G 0n}

[0033] S={S1,…,S n}

[0034] v={v1,…,v n}

[0035] Among them, G0 represents the current unit load set, G 01 Indicates the current unit load of the first gravity energy storage unit, G 0nrepresents the current unit load of the nth gravity energy storage unit, S represents the weight contact area set, S1 represents the weight contact area of ​​the first gravity energy storage unit, S n represents the weight contact area of ​​the nth gravity energy storage unit, v represents the unit rated speed set, v1 represents the unit rated speed of the first gravity energy storage unit, v n represents the unit rated speed of the nth gravity energy storage unit, and n represents the number of gravity energy storage units;

[0036] The current unit load is increased according to the preset number of lifted weights to obtain a target unit load set, wherein the target unit load set is expressed as:

[0037] G={G1,…,G n}

[0038] G1=G 01 +k s ×m×g,…,G n =G 0n +k s ×m×g

[0039] Among them, G represents the target unit load set, G1 represents the target unit load of the first gravity energy storage unit, G n represents the target unit load of the nth gravity energy storage unit, k s represents the amount of weight being lifted, m represents the mass of the energy storage weight, and g represents the acceleration due to gravity;

[0040] According to the target unit load set, the weight contact area set and the unit rated speed set, the target energy storage power is calculated using the following formula:

[0041]

[0042] Among them, P m represents the target energy storage power, μ represents the preset efficiency coefficient, δ represents the preset friction loss, i represents the serial number of the gravity energy storage unit, ρ represents the preset air density, C represents the preset resistance coefficient, G i represents the target unit load of the i-th gravity energy storage unit, v i represents the rated speed of the i-th gravity energy storage unit, S i Represents the weight contact area of ​​the i-th gravity energy storage unit.

[0043] Optionally, the calculating of the falling time of the heavy object based on the bottom bin height and the top bin height includes:

[0044] According to the bottom bin height and top bin height, the falling height is calculated using the following formula:

[0045] h x=h g -h d

[0046] Among them, h x Indicates the falling height, h g Indicates the top bin height, h d Indicates the height of the bottom bin;

[0047] Based on the falling height, the falling time of the weight is calculated using the following formula:

[0048]

[0049] Among them, t0 represents the falling time of the weight, and g represents the preset gravitational acceleration.

[0050] Optionally, constructing a falling constraint condition for the nth falling duration according to the falling duration of the heavy object and a preset first falling duration includes:

[0051] The energy release preparation time is taken as the first falling time, and based on the first falling time and the falling time of the heavy object, the following falling constraint condition for the nth falling time is constructed:

[0052] t n >t1-t0

[0053] Among them, t n It represents the duration of the nth drop, t1 represents the duration of the 1st drop, and t0 represents the duration of the heavy object falling.

[0054] Optionally, constructing the interval constraint condition of the drop interval according to the load demand power and the first drop duration includes:

[0055] According to the load demand power and the first drop duration, the following drop interval constraint conditions are constructed:

[0056] and:

[0057] Among them, Δt represents the falling interval, n represents the number of gravity energy storage units, P f represents the load demand power, g represents the acceleration of gravity, and m represents the mass of the energy storage object.

[0058] Optionally, the setting of a drop duration set based on the first drop duration, the drop constraint condition and the interval constraint condition includes:

[0059] The falling interval is set according to the interval constraint condition, and the falling duration set of the gravity energy storage system is calculated according to the first falling duration, the falling interval and the falling constraint condition. The falling duration table set is shown as:

[0060] t={t1,t2,…,t n}

[0061] t n =t n-1 -Δt

[0062] Among them, t2 represents the second falling time, t n Indicates the duration of the nth drop, t n-1 Indicates the duration of the n-1th drop.

[0063] Optionally, the power regulation of the gravity energy storage system according to the falling time set, the target energy storage power and the current energy storage power includes:

[0064] The gravity energy release power of the gravity energy storage system is calculated using the following formula:

[0065] P s =m×g 2 ×[t1-(n-1)×Δt], and:

[0066] Among them, P s represents the gravity energy release power, W0 represents the current energy storage capacity, P m represents the target energy storage power;

[0067] Determine whether the load demand power is greater than the gravity energy release power:

[0068] If the load demand power is greater than the gravity energy release power, a regulated energy storage weight is obtained by adding a preset number of falling weights to the gravity energy storage system;

[0069] The gravity energy release power is regulated according to the regulating energy storage weight to obtain a target energy release power, which is expressed as:

[0070] P l =m×g 2 ×[t1-(n-1)×Δt]+k x ×m×g×h k

[0071] and:

[0072]

[0073] Among them, P l represents the target energy release power, k x Indicates the amount of falling weight, h k Indicates the height of the added falling energy storage weight;

[0074] Taking the target energy release power as the gravity energy release power, and returning to the step of determining whether the load demand power is greater than the gravity energy release power;

[0075] If the load demand power is not greater than the gravity energy release power, the gravity energy storage power is maintained until the gravity energy release period ends, completing the power regulation of the gravity energy storage system.

[0076] To achieve the above object, the present invention also provides a power control system of a gravity energy storage system based on load response, comprising:

[0077] A power grid load acquisition module is used to obtain the peak load period and load demand power of the regional power grid, calculate the peak demand power based on the peak load period and load demand power, divide the pre-built gravity energy storage system into working stages according to the peak load period, and obtain the gravity energy storage period and the gravity energy release period, wherein the gravity energy storage system includes a plurality of gravity energy storage units, and the gravity energy storage units include: energy storage weights, a transmission bottom bin, a transmission top bin, and a transmission belt;

[0078] The energy storage power calculation module is used to obtain the current energy storage power, current energy storage power and current gravity load of the gravity energy storage system during the gravity energy storage period, calculate the future load power according to the peak demand power and the current energy storage power, and calculate the future energy storage power of the gravity energy storage system according to the load peak period and the current energy storage power;

[0079] The energy storage power control module is used to determine whether the future energy storage power is greater than the future load power. If the future energy storage power is greater than the future load power, the current energy storage power is used as the target energy storage power until the gravity energy release period begins. If the future energy storage power is not greater than the future load power, the power of the gravity energy storage system is controlled by changing the current gravity load to obtain the target energy storage power, and the target energy storage power is maintained until the gravity energy release period begins.

[0080] The energy release power control module is used to obtain the bottom bin height of the bottom bin and the top bin height of the top bin during the gravity energy release period, calculate the falling time of the heavy object based on the bottom bin height and the top bin height, construct the falling constraint condition of the nth falling time according to the falling time of the heavy object and the preset first falling time, construct the interval constraint condition of the falling interval according to the load demand power and the first falling time, set the falling time set based on the first falling time, the falling constraint condition and the interval constraint condition, and perform power control on the gravity energy storage system according to the falling time set, the target energy storage power and the current energy storage power.

[0081] In order to solve the above problem, the present invention further provides an electronic device, the electronic device comprising:

[0082] a memory storing at least one instruction; and

[0083] The processor executes the instructions stored in the memory to implement the above-mentioned load response-based gravity energy storage system power control method.

[0084] In order to solve the above problems, the present invention also provides a computer-readable storage medium, in which at least one instruction is stored. The at least one instruction is executed by a processor in an electronic device to implement the above-mentioned load response-based gravity energy storage system power control method.

[0085] The present invention is to solve the problems described in the background technology. The present invention obtains the peak load period and load demand power of the regional power grid, calculates the peak demand power based on the peak load period and load demand power, and realizes accurate acquisition of the load situation of the regional power grid, which provides a prerequisite and regulation basis for subsequent power regulation. The gravity energy storage system is divided into working stages according to the peak load period to obtain the gravity energy storage period and the gravity energy release period, which clarifies the working mode of the gravity energy storage system, so that the gravity energy storage system can respond faster to the regional power grid according to the working stage. During the gravity energy storage period, the current energy storage capacity, current energy storage power and current gravity load of the gravity energy storage system are obtained, and the future load capacity is calculated based on the peak demand capacity and the current energy storage capacity. This provides conditions for subsequent power regulation and clarifies the goal of power regulation. Next, based on the load peak period and the current energy storage power, the future energy storage capacity of the gravity energy storage system is calculated, which provides conditions for the subsequent judgment process. By judging whether the future energy storage capacity is greater than the future load capacity, the gravity energy storage system can filter out situations where power regulation is not required, which speeds up the process of power regulation and accelerates the gravity energy storage system. Response time: if the future energy storage power is greater than the future load power, the power regulation process is further accelerated by taking the current energy storage power as the target energy storage power until the gravity energy release period begins. If the future energy storage power is not greater than the future load power, the power of the gravity energy storage system is regulated by changing the current gravity load to obtain the target energy storage power, and the target energy storage power is maintained until the gravity energy release period begins. This step highly correlates the load response of the regional power grid with the energy storage power of the gravity energy storage system, so that the power regulation of the gravity energy storage system always meets the load requirements of the regional power grid, further accelerating the response time of the gravity energy storage system. In the gravity energy release period, the falling constraint condition of the nth falling time is constructed according to the falling time of the heavy object and the first falling time, and the interval constraint condition of the falling interval is constructed according to the load demand power and the first falling time. This step solves the problem that the gravity energy release power of the gravity energy storage system cannot meet the load demand power in the gravity energy release period by dropping the energy storage heavy object in advance, and speeds up the response time of the gravity energy storage system. Finally, based on the first falling time, the falling constraint condition and the interval constraint condition, the falling time set is set, and the gravity energy storage system is power-controlled according to the falling time set, the target energy storage power and the current energy storage power. In this step, multiple energy storage heavy objects are released one by one, so that the gravity energy release power in the entire gravity energy release period can be well controlled, thereby preventing a large amount of energy waste caused by the disorderly falling of the energy storage heavy objects. Therefore, the present invention can speed up the response time of the power regulation of the gravity energy storage system and reduce the energy waste in the energy supply process. BRIEF DESCRIPTION OF THE DRAWINGS

[0086] Figure 1A schematic flow chart of a power control method for a gravity energy storage system based on load response provided in one embodiment of the present invention;

[0087] Figure 2 A functional module diagram of a power control system of a gravity energy storage system based on load response provided by an embodiment of the present invention;

[0088] Figure 3 A schematic diagram of the structure of an electronic device for implementing the load response-based power control method of a gravity energy storage system provided in one embodiment of the present invention.

[0089] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0090] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0091] The embodiment of the present application provides a power control method for a gravity energy storage system based on load response. The execution subject of the power control method for a gravity energy storage system based on load response includes but is not limited to at least one of the electronic devices such as a server and a terminal that can be configured to execute the method provided in the embodiment of the present application. In other words, the power control method for a gravity energy storage system based on load response can be executed by software or hardware installed on a terminal device or a server device, and the software can be a blockchain platform. The server includes but is not limited to: a single server, a server cluster, a cloud server or a cloud server cluster, etc.

[0092] Reference Figure 1 FIG. 1 is a flow chart of a power control method for a gravity energy storage system based on load response provided by an embodiment of the present invention. In this embodiment, the power control method for a gravity energy storage system based on load response includes:

[0093] S1. Obtain the load peak period and load demand power of the regional power grid, and calculate the peak demand power based on the load peak period and load demand power.

[0094] It should be explained that the regional power grid refers to a power grid system that supplies electricity to power grid users in a specific area. The regional power grid has the function of supplying electricity to power grid users. At the same time, the regional power grid can monitor the power consumption of power grid users in real time, and can predict the power consumption of power grid users in the next stage based on the long-term power consumption, so as to regulate the power consumption of power grid users when the power supply is insufficient and send energy release signals to the gravity energy storage system of the regional power grid in advance, for example: restricting the power consumption of manufacturing units with high power consumption, sending energy release signals to the gravity energy storage system, etc.

[0095] It is understandable that the peak load period refers to the peak power consumption period of the power grid users predicted by the regional power grid. The load demand power refers to the power supply power that the gravity energy storage system needs to provide to the regional power grid during the peak load period.

[0096] In detail, when the regional power grid predicts the peak load period, it will predict the total load demand power required during the peak load period based on previous power consumption. When the regional power generation systems of the regional power grid cannot meet the total load demand power, the regional power grid will obtain different power demand powers from the regional power storage systems so that the total load demand power can be met during the peak load period. The load demand power is the power that the gravity energy storage system will supply to the regional power grid during the peak period. The regional power generation system includes: a thermal power generation system and a new energy power generation system. The peak demand power refers to the total power supplied by the gravity energy storage system to the regional power grid during the entire peak load period.

[0097] In detail, the calculation of the peak power demand based on the load peak period and the load demand power includes:

[0098] Obtain the load peak duration of the load peak period, wherein the load peak period is expressed as:

[0099] T f =(T k T j )

[0100] Among them, T f represents the peak load period, T k Indicates the peak start time, T j Indicates the peak end time;

[0101] The peak power demand is calculated using the following formula:

[0102] W f =(T j -T k )×P f

[0103] Among them, W f Indicates the peak power demand, P f Indicates the load demand power.

[0104] S2. Divide the pre-constructed gravity energy storage system into working stages according to the peak load period to obtain gravity energy storage period and gravity energy release period, wherein the gravity energy storage system includes multiple gravity energy storage units, and the gravity energy storage units include: energy storage weights, a conveying bottom bin, a conveying top bin and a conveying belt.

[0105] It is understandable that the gravity energy storage system refers to the use of the gravity load of heavy objects to convert gravitational potential energy into electrical energy to achieve the supply of power to the regional power grid. The gravity energy storage period refers to the period of time when the gravity energy storage system stores the surplus power of the regional power grid, wherein the surplus power refers to the remaining power after the power output of the regional power grid meets the power demand of the power grid users. The gravity energy release period refers to the period of time when the gravity energy storage system releases its accumulated gravitational potential energy to supply power to the regional power grid. The gravity energy storage unit refers to an energy storage system that works independently in the gravity energy storage system, wherein each gravity energy storage unit includes: energy storage weights, a transmission bottom bin, a transmission top bin and a transmission belt, wherein the mass of the energy storage weights of different gravity energy storage units is the same, but the number of energy storage weights carried by different gravity energy storage units may be different, the heights of the transmission bottom bins and transmission top bins of different gravity energy storage units are the same, and the materials of the transmission belts are the same.

[0106] It should be explained that when the gravity energy storage unit is in the gravity energy storage period, the energy storage weight will be transported from the bottom of the transmission warehouse to the top of the transmission warehouse by the conveyor belt. In this process, the surplus power of the regional power grid provides the energy required for the energy storage weight to rise. When the energy storage weight is transported to the top of the transmission warehouse, the gravity release energy of the energy storage weight is the electricity stored in the gravity energy storage unit. The power energy storage process of the gravity energy storage unit should be repeated, that is, when one energy storage weight is transported to the top of the transmission warehouse, the gravity energy storage unit will allow another energy storage weight to continue to rise, and the total amount of electricity stored in all gravity energy storage units is the electricity stored in the gravity energy storage system.

[0107] In detail, the pre-built gravity energy storage system is divided into working stages according to the peak load period to obtain the gravity energy storage period and the gravity energy release period, including:

[0108] Get the current time and set a release preparation time based on the load demand power;

[0109] According to the peak start time and the energy release preparation time of the load peak period, the actual start time is determined, wherein the actual start time is expressed as:

[0110] T a =T k -t z

[0111] Among them, T a represents the actual start time, t z Indicates the energy release preparation time;

[0112] The gravity energy storage period is determined according to the current time and the actual start time, and the gravity energy release period is determined according to the actual start time and the peak end time, wherein the gravity energy storage period and the gravity energy release stage are respectively expressed as:

[0113] T c =(T n T a ), T s =(T a T j )

[0114] Among them, T n represents the current time, T c represents the gravity energy storage period, T s Indicates the gravitational energy release period.

[0115] It should be explained that the energy release preparation time refers to the preparation time of the gravity energy storage system before releasing energy, and the energy release preparation time is manually determined.

[0116] For example, the peak load period of a certain gravity energy storage system receiving the regional power grid is: (9:0015:00), the current time is 2:00, and the manually set energy release preparation time is 20 minutes. The actual start time of the peak load moment is 8:40, 20 minutes earlier than 9:00 in the morning, the gravity energy storage period is (2:008:40), and the gravity energy release period is (8:4015:00).

[0117] S3. During the gravity energy storage period, obtain the current energy storage capacity, current energy storage power and current gravity load of the gravity energy storage system, calculate the future load capacity according to the peak demand capacity and the current energy storage capacity, and calculate the future energy storage capacity of the gravity energy storage system according to the load peak period and the current energy storage power.

[0118] It is understandable that the current energy storage capacity refers to the total amount of energy that has been stored in the gravity energy storage system at the current moment. The current energy storage power refers to the power of the gravity energy storage system for energy storage at the current moment, and the current energy storage power is the sum of the lifting powers of each gravity energy storage unit to lift the energy storage weight.

[0119] It can be understood that the current gravity load refers to the total weight of the energy storage weights lifted by each gravity energy storage system. The future load power refers to the total power that the gravity energy storage system needs to store during the gravity energy storage period, and the future load power is the difference between the peak demand power and the current energy storage power. The future energy storage power refers to the total power that the gravity energy storage system can store at the end of the gravity energy storage period if it continues to store power according to the current energy storage power.

[0120] For example, the current energy storage capacity of a gravity energy storage system is 50,000 kWh, and the peak demand capacity is 80,000 kWh. This means that the regional power grid needs the gravity energy storage system to provide more than 80,000 kWh of electricity during the peak load period, but the gravity energy storage system only has 50,000 kWh of electricity at this time. Therefore, the gravity energy storage system needs to store at least 30,000 kWh of electricity during the gravity energy storage period to meet the needs of the regional power grid during the peak load period, that is, the future load capacity is 30,000 kWh.

[0121] S4. Determine whether the future energy storage capacity is greater than the future load capacity.

[0122] It should be explained that when the gravity energy storage system obtains the peak load period and load demand power given by the regional power grid, it will evaluate whether it can complete the power supply to the regional power grid with the load demand power during the peak load period. The evaluation is to determine whether the future energy storage power is greater than the future load power.

[0123] If the future energy storage power is greater than the future load power, S5 is executed to use the current energy storage power as the target energy storage power until the gravity energy release period begins.

[0124] It should be explained that when the future energy storage capacity is greater than the future load capacity, it means that the gravity energy storage system will continue to store electricity according to the current energy storage power and will be able to meet the requirements of the regional power grid for the gravity energy storage system during the peak load period. Therefore, there is no need to regulate the current energy storage power of the gravity energy storage system at this time.

[0125] If the future energy storage power is not greater than the future load power, execute S6, control the power of the gravity energy storage system by changing the current gravity load to obtain the target energy storage power, and maintain the target energy storage power until entering the gravity energy release period.

[0126] It can be understood that the target energy storage power refers to the energy storage power that can meet the load demand power of the regional power grid during the peak load period after regulation.

[0127] In detail, the power regulation of the gravity energy storage system by changing the current gravity load includes:

[0128] The current unit load set, the weight contact area set and the unit rated speed set of multiple gravity energy storage units are obtained, wherein the current load gravity set, the weight contact area set and the current weight speed set are respectively expressed as:

[0129] G0={G 01 , …, G 0n}

[0130] S={S1,…,S n}

[0131] v={v1,…,v n}

[0132] Among them, G0 represents the current unit load set, G 01 Indicates the current unit load of the first gravity energy storage unit, G 0n represents the current unit load of the nth gravity energy storage unit, S represents the weight contact area set, S1 represents the weight contact area of ​​the first gravity energy storage unit, S n represents the weight contact area of ​​the nth gravity energy storage unit, v represents the unit rated speed set, v1 represents the unit rated speed of the first gravity energy storage unit, v n represents the unit rated speed of the nth gravity energy storage unit, and n represents the number of gravity energy storage units;

[0133] The current unit load is increased according to the preset number of lifted weights to obtain a target unit load set, wherein the target unit load set is expressed as:

[0134] G={G1,…,G n}

[0135] G1=G 01 +k s ×m×g,…,G n =G 0n +k s ×m×g

[0136] Among them, G represents the target unit load set, G1 represents the target unit load of the first gravity energy storage unit, G n represents the target unit load of the nth gravity energy storage unit, k s represents the amount of weight being lifted, m represents the mass of the energy storage weight, and g represents the acceleration due to gravity;

[0137] According to the target unit load set, the weight contact area set and the unit rated speed set, the target energy storage power is calculated using the following formula:

[0138]

[0139] Among them, P m represents the target energy storage power, μ represents the preset efficiency coefficient, δ represents the preset friction loss, i represents the serial number of the gravity energy storage unit, ρ represents the preset air density, C represents the preset resistance coefficient, G i represents the target unit load of the i-th gravity energy storage unit, v i represents the rated speed of the i-th gravity energy storage unit, S i Represents the weight contact area of ​​the i-th gravity energy storage unit.

[0140] It can be understood that the current unit load represents the total weight of the energy storage weights currently being raised in the gravity energy storage unit. The energy storage weight area refers to the total area of ​​the energy storage weights being raised in the gravity energy storage unit in contact with the air. The unit rated speed refers to the speed at which the gravity energy storage unit raises the energy storage weights, wherein the unit rated speed of each gravity energy storage unit is a constant. The number of rising weights refers to the number of rising energy storage weights to be added to the gravity energy storage unit during the gravity energy storage period, and the number of increased energy storage weights is the number of rising energy storage weights added to each gravity energy storage unit. The target unit load refers to the gravity load carried by the gravity energy storage unit after the number of energy storage weights is increased during the gravity energy storage period.

[0141] It is clear that the efficiency coefficient refers to the conversion efficiency of the gravity energy storage system in converting electrical energy into mechanical energy. The efficiency coefficient is a constant value and can be obtained from previous measurements. The friction loss refers to the energy loss caused by friction during the ascent of the energy storage weight. The friction coefficient is determined by the material of the gravity energy storage system and is a constant value. The resistance coefficient refers to the resistance encountered by the energy storage weight during the ascent. The resistance coefficient is a constant value.

[0142] S7. During the gravity energy release period, obtain the bottom bin height of the bottom bin and the top bin height of the top bin, and calculate the falling time of the heavy object based on the bottom bin height and the top bin height.

[0143] It can be understood that the bottom bin height refers to the height of the bottom bin for transmission. The top bin height refers to the height of the top bin for transmission, wherein the bottom bin height of the bottom bin for transmission of different gravity energy storage units and the top bin height of the top bin for transmission are the same. The falling time of the heavy object refers to the time it takes for the energy storage heavy object to fall freely from the top bin for transmission to the bottom bin for transmission.

[0144] In detail, the calculation of the falling time of the heavy object based on the bottom bin height and the top bin height includes:

[0145] According to the bottom bin height and top bin height, the falling height is calculated using the following formula:

[0146] h x =h g -h d

[0147] Among them, h x Indicates the falling height, h g Indicates the top bin height, h d Indicates the height of the bottom bin;

[0148] Based on the falling height, the falling time of the weight is calculated using the following formula:

[0149]

[0150] Among them, t0 represents the falling time of the weight, and g represents the preset gravitational acceleration.

[0151] It can be understood that the falling height refers to the falling distance of the energy storage weight falling freely from the top warehouse of the transmission to the bottom warehouse of the transmission.

[0152] S8. According to the falling time of the heavy object and the preset first falling time, a falling constraint condition for the nth falling time is constructed. According to the load demand power and the first falling time, an interval constraint condition for the falling interval is constructed.

[0153] It is understandable that the first drop duration refers to the advance drop duration of the first energy storage weight falling in the gravity energy storage system before the peak starts. The nth drop duration refers to the advance drop duration of the nth energy storage weight falling in the gravity energy storage system before the peak starts. The drop constraint condition refers to an inequality about the nth drop duration. The drop interval refers to the time interval from the start of the drop of an energy storage weight in one gravity energy storage unit to the start of the drop of an energy storage weight in the next gravity energy storage unit.

[0154] For example, a gravity energy storage system receives a load peak period of (9:0015:00), and the peak starts at 9:00. The manually set energy release preparation time is 20 minutes. The energy release preparation time can be used as the first drop time. Then, at the moment of the first drop time before the start of the load peak period, that is, at 8:40, 20 minutes before 9:00, the first energy storage weight will be dropped from the gravity energy storage system.

[0155] It should be explained that the gravity energy storage device will allow the energy storage weights of each gravity energy storage unit to fall freely during the gravity energy release period. The free fall process is a free fall motion. During this process, the real-time falling speed of the energy storage weight starts from zero and increases. Therefore, the energy release power of a single gravity energy storage unit is zero when the energy storage weight begins to fall. However, the regional power grid requires the gravity energy storage system to provide a load demand power at the beginning of the peak load period. This results in that if each gravity energy storage unit releases energy at the beginning of the peak load period, the gravity energy storage system will not be able to meet the load demand power required by the regional power grid, so it is necessary to allow the gravity energy storage unit to release gravity in advance. With the free fall motion, the amount of electricity released by the gravity energy storage system will increase, which will result in a lot of waste. Therefore, all weight energy storage units cannot be released by gravity at the same time, so it is necessary to impose n-th falling time constraints and falling interval constraints on the gravity energy storage system.

[0156] In detail, the step of constructing the falling constraint condition of the nth falling time duration according to the falling time duration of the heavy object and the preset first falling time duration includes:

[0157] Take the energy release preparation duration as the first falling duration, and based on the first falling duration and the heavy object falling duration, construct the following falling constraint conditions for the nth falling duration:

[0158] t n >t1 - t0

[0159] where t n represents the nth falling duration, t1 represents the first falling duration, and t0 represents the heavy object falling duration.

[0160] It should be explained that after the heavy object of the first gravity energy storage unit falls for energy storage, the last gravity energy storage unit, that is, the nth gravity energy storage unit, must start the heavy object falling for energy storage before the heavy object of the first gravity energy storage unit completely lands, from which the falling constraint conditions for the nth falling duration can be constructed.

[0161] Specifically, constructing the interval constraint conditions of the falling interval according to the load demand power and the first falling duration includes:

[0162] Construct the following interval constraint conditions of the falling interval according to the load demand power and the first falling duration:

[0163] And:

[0164] where Δt represents the falling interval, n represents the number of gravity energy storage units, P f represents the load demand power, g represents the acceleration due to gravity, and m represents the mass of the heavy object for energy storage.

[0165] It should be explained that before the heavy object released by the first gravity energy storage unit completely falls, the heavy objects of all subsequent gravity energy storage units must have started to fall, from which one of the necessary conditions for the falling interval is obtained: (n - 1)×Δt < t0. At the same time, the starting release power of the gravity energy storage system at the beginning of the peak load period must be greater than the load demand power, that is, the sum of the unit release powers of all gravity energy storage units in the gravity energy storage system at the peak start moment must be greater than the load demand power, from which the second necessary condition for the falling interval is obtained: m×g×g×(t1 + t2 + … + t n ) > P f , where t2 = t1 - Δt, …, t n = t1 - (n - 1)×Δt. Therefore, the interval constraint conditions can be constructed according to the two necessary conditions of the falling interval.

[0166] S9. Based on the first falling duration, the falling constraint conditions and the interval constraint conditions, set the falling duration set, and perform power regulation on the gravity energy storage system according to the falling duration set, the target energy storage power and the current energy storage power.

[0167] It can be understood that the falling time set refers to the set of time durations for all gravity energy storage units to release the energy storage weights in advance before the peak start time.

[0168] For example, a certain weight energy storage system receives a peak load period of (9:00-15:00). The weight energy storage system has 5 gravity energy storage units. The gravity energy storage system will drop a storage weight of a gravity energy storage unit at 8:40, and after a time interval of 2 minutes, it will drop a storage weight of a gravity energy storage unit at 8:42, ..., and drop a storage weight of the last gravity energy storage unit at 8:48, wherein the time of each energy storage weight dropping is consistent with the peak load period. The interval durations of the peak start times in the peak period are: 20min, 18min, 16min, 14min and 12min, then the 1st drop duration, the 2nd drop duration, the 3rd drop duration, the 4th drop duration and the 5th drop duration are: 20min, 18min, 16min, 14min and 12min respectively, and the drop durations are summarized into a drop duration set: {20min, 18min, 16min, 14min, 12min}.

[0169] In detail, the setting of the drop duration set based on the first drop duration, the drop constraint condition and the interval constraint condition includes:

[0170] The falling interval is set according to the interval constraint condition, and the falling duration set of the gravity energy storage system is calculated according to the first falling duration, the falling interval and the falling constraint condition. The falling duration table set is shown as:

[0171] t={t1,t2,…,t n}

[0172] t n =t n-1 -Δt

[0173] Among them, t2 represents the second falling time, t n Indicates the duration of the nth drop, t n-1 Indicates the duration of the n-1th drop.

[0174] It should be explained that after the falling time set is determined, a gravity energy storage unit is selected as the first energy storage unit, and an energy storage weight of the first energy storage unit is released from the conveying top bin of the first energy storage unit. After Δt time from the time when the first energy storage unit releases the energy storage weight, a gravity energy storage unit is selected as the second energy storage unit, and an energy storage weight of the second energy storage unit is released from the conveying top bin of the second energy storage unit,…, after Δt time from the time when the n-1 energy storage unit releases the energy storage weight, an energy storage weight of the n energy storage unit is released from the conveying top bin of the n energy storage unit.

[0175] For example, a gravity energy storage system has a total of 5 gravity energy storage units. The peak load period received at a certain time is (9:0015:00), and the gravity energy release period is (8:4015:00). The set falling time set is {20min, 18min, 16min, 14min, 12min}. The gravity energy storage system will perform the following energy release operation: a stored energy weight of a gravity energy storage unit will fall at 8:40, 8:42, 8:44, 8:46 and 8:48 respectively.

[0176] In detail, the power regulation of the gravity energy storage system according to the falling time set, the target energy storage power and the current energy storage power includes:

[0177] The gravity energy release power of the gravity energy storage system is calculated using the following formula:

[0178] P s =m×g 2 ×[t1-(n-1)×Δt], and:

[0179] Among them, P s represents the gravity energy release power, W0 represents the current energy storage capacity, P m represents the target energy storage power;

[0180] Determine whether the load demand power is greater than the gravity energy release power:

[0181] If the load demand power is greater than the gravity energy release power, the energy storage weight is adjusted by adding a preset number of falling weights to the gravity energy storage system;

[0182] The gravity energy release power is regulated according to the regulating energy storage weight to obtain a target energy release power, which is expressed as:

[0183] P l =m×g 2 ×[t1-(n-1)×Δt]+G x ×h k , G x =k x ×m×g

[0184] and:

[0185]

[0186] Among them, P l Represents the target energy release power, G x Indicates the regulated energy storage weight, h krepresents the height of the added falling energy storage weight, k x Indicates the number of falling weights;

[0187] Taking the target energy release power as the gravity energy release power, and returning to the step of determining whether the load demand power is greater than the gravity energy release power;

[0188] If the load demand power is not greater than the gravity energy release power, the gravity energy storage power is maintained until the gravity energy release period ends, completing the power regulation of the gravity energy storage system.

[0189] It is understandable that the number of falling weights refers to the number of energy storage weights to be added to the gravity energy storage system during the gravity energy release period. The increase in the number of falling weights is to increase the falling energy storage weights of the entire gravity energy storage system, rather than adding falling energy storage weights to a single gravity energy storage unit. The regulating energy storage weight refers to the total weight of the increased number of falling weights.

[0190] For example, in a certain gravity energy storage system, the number of energy storage weights falling at a certain moment in the gravity energy release period is 100, and the mass of the energy storage weights is 100kg, wherein 100 energy storage weights are the total number of energy storage weights falling in all gravity energy storage units, and the set number of falling weights is 5. When it is judged that the load demand power is greater than the gravity energy release power, 5 falling energy storage weights are added to the entire gravity energy release system. At this time, the energy storage weight is adjusted to 5×100=500kg.

[0191] The present invention is to solve the problems described in the background technology. The present invention obtains the peak load period and load demand power of the regional power grid, calculates the peak demand power based on the peak load period and load demand power, and realizes accurate acquisition of the load situation of the regional power grid, which provides a prerequisite and regulation basis for subsequent power regulation. The gravity energy storage system is divided into working stages according to the peak load period to obtain the gravity energy storage period and the gravity energy release period, which clarifies the working mode of the gravity energy storage system, so that the gravity energy storage system can respond faster to the regional power grid according to the working stage. During the gravity energy storage period, the current energy storage capacity, current energy storage power and current gravity load of the gravity energy storage system are obtained, and the future load capacity is calculated based on the peak demand capacity and the current energy storage capacity. This provides conditions for subsequent power regulation and clarifies the goal of power regulation. Next, based on the load peak period and the current energy storage power, the future energy storage capacity of the gravity energy storage system is calculated, which provides conditions for the subsequent judgment process. By judging whether the future energy storage capacity is greater than the future load capacity, the gravity energy storage system can filter out situations where power regulation is not required, which speeds up the process of power regulation and accelerates the gravity energy storage system. Response time: if the future energy storage power is greater than the future load power, the power regulation process is further accelerated by taking the current energy storage power as the target energy storage power until the gravity energy release period begins. If the future energy storage power is not greater than the future load power, the power of the gravity energy storage system is regulated by changing the current gravity load to obtain the target energy storage power, and the target energy storage power is maintained until the gravity energy release period begins. This step highly correlates the load response of the regional power grid with the energy storage power of the gravity energy storage system, so that the power regulation of the gravity energy storage system always meets the load requirements of the regional power grid, further accelerating the response time of the gravity energy storage system. In the gravity energy release period, the falling constraint condition of the nth falling time is constructed according to the falling time of the heavy object and the first falling time, and the interval constraint condition of the falling interval is constructed according to the load demand power and the first falling time. This step solves the problem that the gravity energy release power of the gravity energy storage system cannot meet the load demand power in the gravity energy release period by dropping the energy storage heavy object in advance, and speeds up the response time of the gravity energy storage system. Finally, based on the first falling time, the falling constraint condition and the interval constraint condition, the falling time set is set, and the gravity energy storage system is power-controlled according to the falling time set, the target energy storage power and the current energy storage power. In this step, multiple energy storage heavy objects are released one by one, so that the gravity energy release power in the entire gravity energy release period can be well controlled, thereby preventing a large amount of energy waste caused by the disorderly falling of the energy storage heavy objects. Therefore, the present invention can speed up the response time of the power regulation of the gravity energy storage system and reduce the energy waste in the energy supply process.

[0192] like Figure 2, which is a functional module diagram of a power control system of a gravity energy storage system based on load response provided by an embodiment of the present invention.

[0193] The power control system 100 of the gravity energy storage system based on load response of the present invention can be installed in an electronic device. According to the functions to be implemented, the power control system 100 of the gravity energy storage system based on load response can include a power grid load acquisition module 101, a storage power calculation module 102, an energy storage power control module 103 and an energy release power control module 104. The module described in the present invention can also be referred to as a unit, which refers to a series of computer program segments that can be executed by an electronic device processor and can complete fixed functions, which are stored in the memory of the electronic device.

[0194] The power grid load acquisition module 101 is used to obtain the peak load period and load demand power of the regional power grid, calculate the peak demand power based on the peak load period and load demand power, divide the pre-built gravity energy storage system into working stages according to the peak load period, and obtain the gravity energy storage period and the gravity energy release period, wherein the gravity energy storage system includes a plurality of gravity energy storage units, and the gravity energy storage units include: energy storage weights, a transmission bottom bin, a transmission top bin, and a transmission belt;

[0195] The energy storage power calculation module 102 is used to obtain the current energy storage power, current energy storage power and current gravity load of the gravity energy storage system during the gravity energy storage period, calculate the future load power according to the peak demand power and the current energy storage power, and calculate the future energy storage power of the gravity energy storage system according to the load peak period and the current energy storage power;

[0196] The energy storage power control module 103 is used to determine whether the future energy storage power is greater than the future load power. If the future energy storage power is greater than the future load power, the current energy storage power is used as the target energy storage power until the gravity energy release period is entered. If the future energy storage power is not greater than the future load power, the power of the gravity energy storage system is controlled by changing the current gravity load to obtain the target energy storage power, and the target energy storage power is maintained until the gravity energy release period is entered;

[0197] The energy release power regulation module 104 is used to obtain the bottom bin height of the bottom bin and the top bin height of the top bin during the gravity energy release period, calculate the falling time of the heavy object based on the bottom bin height and the top bin height, construct the falling constraint condition of the nth falling time according to the falling time of the heavy object and the preset first falling time, construct the interval constraint condition of the falling interval according to the load demand power and the first falling time, set the falling time set based on the first falling time, the falling constraint condition and the interval constraint condition, and perform power regulation on the gravity energy storage system according to the falling time set, the target energy storage power and the current energy storage power.

[0198] In detail, the modules in the load response-based gravity energy storage system power control system 100 described in the embodiment of the present invention are used in the same manner as described above. Figure 1 The power control method of the gravity energy storage system based on load response described in the present invention is the same as the technical means and can produce the same technical effects, so it will not be repeated here.

[0199] like Figure 3 , which is a schematic diagram of the structure of an electronic device for implementing a power control method of a gravity energy storage system based on load response provided by an embodiment of the present invention.

[0200] The electronic device 1 may include a processor 10, a memory 11 and a bus 12, and may also include a computer program stored in the memory 11 and executable on the processor 10, such as a power control method program for a gravity energy storage system based on load response.

[0201] Among them, the memory 11 includes at least one type of readable storage medium, and the readable storage medium includes flash memory, mobile hard disk, multimedia card, card-type memory (for example: SD or DX memory, etc.), magnetic memory, disk, optical disk, etc. The memory 11 can be an internal storage unit of the electronic device 1 in some embodiments, such as a mobile hard disk of the electronic device 1. The memory 11 can also be an external storage device of the electronic device 1 in other embodiments, such as a plug-in mobile hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (SecureDigital, SD) card, a flash card (Flash Card), etc. equipped on the electronic device 1. Further, the memory 11 also includes an internal storage unit of the electronic device 1 and an external storage device. The memory 11 can not only be used to store application software and various types of data installed in the electronic device 1, such as the code of the power control method program of the gravity energy storage system based on load response, but also can be used to temporarily store data that has been output or is to be output.

[0202] The processor 10 may be composed of an integrated circuit in some embodiments, for example, a single packaged integrated circuit, or a plurality of packaged integrated circuits with the same or different functions, including one or more central processing units (CPUs), microprocessors, digital processing chips, graphics processors, and combinations of various control chips, etc. The processor 10 is the control core (Control Unit) of the electronic device, and uses various interfaces and lines to connect the various components of the entire electronic device, and executes or executes the programs or modules stored in the memory 11 (such as a power control method program for a gravity energy storage system based on load response, etc.), and calls the data stored in the memory 11 to execute various functions of the electronic device 1 and process data.

[0203] The bus 12 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The bus 12 may be divided into an address bus, a data bus, a control bus, etc. The bus 12 is configured to realize connection and communication between the memory 11 and at least one processor 10, etc.

[0204] Figure 3 Only an electronic device with components is shown, and those skilled in the art will understand that Figure 3 The structure shown does not constitute a limitation on the electronic device 1, and may include fewer or more components than shown in the figure, or combine certain components, or arrange the components differently.

[0205] For example, although not shown, the electronic device 1 may also include a power source (such as a battery) for supplying power to each component. Preferably, the power source may be logically connected to the at least one processor 10 through a power management device, so that the power management device can realize functions such as charging management, discharging management, and power consumption management. The power source may also include any components such as one or more DC or AC power sources, recharging devices, power failure detection circuits, power converters or inverters, power status indicators, etc. The electronic device 1 may also include a variety of sensors, Bluetooth modules, Wi-Fi modules, etc., which will not be repeated here.

[0206] Furthermore, the electronic device 1 may also include a network interface. Optionally, the network interface may include a wired interface and / or a wireless interface (such as a WI-FI interface, a Bluetooth interface, etc.), which is generally used to establish a communication connection between the electronic device 1 and other electronic devices.

[0207] Optionally, the electronic device 1 may further include a user interface, which may be a display, an input unit (such as a keyboard), or a standard wired interface or a wireless interface. Optionally, in some embodiments, the display may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, and an OLED (Organic Light-Emitting Diode) touch device. The display may also be appropriately referred to as a display screen or a display unit, which is used to display information processed in the electronic device 1 and to display a visual user interface.

[0208] The program of the power control method of the gravity energy storage system based on load response stored in the memory 11 of the electronic device 1 is a combination of multiple instructions. When running in the processor 10, it can achieve:

[0209] Obtaining the load peak period and load demand power of the regional power grid, and calculating the peak demand power based on the load peak period and load demand power;

[0210] The pre-constructed gravity energy storage system is divided into working stages according to the peak load period to obtain a gravity energy storage period and a gravity energy release period, wherein the gravity energy storage system includes a plurality of gravity energy storage units, and the gravity energy storage units include: energy storage weights, a transmission bottom bin, a transmission top bin, and a transmission belt;

[0211] During the gravity energy storage period, the current energy storage capacity, current energy storage power and current gravity load of the gravity energy storage system are obtained, the future load capacity is calculated according to the peak demand capacity and the current energy storage capacity, and the future energy storage capacity of the gravity energy storage system is calculated according to the load peak period and the current energy storage power;

[0212] Determining whether the future energy storage capacity is greater than the future load capacity;

[0213] If the future energy storage power is greater than the future load power, the current energy storage power is used as the target energy storage power until the gravity energy release period begins;

[0214] If the future energy storage power is not greater than the future load power, the power of the gravity energy storage system is controlled by changing the current gravity load to obtain the target energy storage power, and the target energy storage power is maintained until the gravity energy release period begins;

[0215] During the gravity energy release period, the bottom bin height of the bottom bin and the top bin height of the top bin are obtained, and the falling time of the heavy object is calculated based on the bottom bin height and the top bin height;

[0216] According to the falling time of the heavy object and the preset first falling time, the falling constraint condition of the nth falling time is constructed, and according to the load demand power and the first falling time, the interval constraint condition of the falling interval is constructed;

[0217] Based on the first falling time, falling constraints and interval constraints, a falling time set is set, and the power of the gravity energy storage system is controlled according to the falling time set, the target energy storage power and the current energy storage power.

[0218] Specifically, the specific implementation method of the processor 10 for the above instructions can refer to Figures 1 to 3 The description of the relevant steps in the corresponding embodiments will not be repeated here.

[0219] Furthermore, if the module / unit integrated in the electronic device 1 is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. The computer-readable storage medium can be volatile or non-volatile. For example, the computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a mobile hard disk, a magnetic disk, an optical disk, a computer memory, and a read-only memory (ROM).

[0220] The present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor of an electronic device, the computer program can implement:

[0221] Obtaining the load peak period and load demand power of the regional power grid, and calculating the peak demand power based on the load peak period and load demand power;

[0222] The pre-constructed gravity energy storage system is divided into working stages according to the peak load period to obtain a gravity energy storage period and a gravity energy release period, wherein the gravity energy storage system includes a plurality of gravity energy storage units, and the gravity energy storage units include: energy storage weights, a transmission bottom bin, a transmission top bin, and a transmission belt;

[0223] During the gravity energy storage period, the current energy storage capacity, current energy storage power and current gravity load of the gravity energy storage system are obtained, the future load capacity is calculated according to the peak demand capacity and the current energy storage capacity, and the future energy storage capacity of the gravity energy storage system is calculated according to the load peak period and the current energy storage power;

[0224] Determining whether the future energy storage capacity is greater than the future load capacity;

[0225] If the future energy storage power is greater than the future load power, the current energy storage power is used as the target energy storage power until the gravity energy release period begins;

[0226] If the future energy storage power is not greater than the future load power, the power of the gravity energy storage system is controlled by changing the current gravity load to obtain the target energy storage power, and the target energy storage power is maintained until the gravity energy release period begins;

[0227] During the gravity energy release period, the bottom bin height of the bottom bin and the top bin height of the top bin are obtained, and the falling time of the heavy object is calculated based on the bottom bin height and the top bin height;

[0228] According to the falling time of the heavy object and the preset first falling time, the falling constraint condition of the nth falling time is constructed, and according to the load demand power and the first falling time, the interval constraint condition of the falling interval is constructed;

[0229] Based on the first falling time, falling constraints and interval constraints, a falling time set is set, and the power of the gravity energy storage system is controlled according to the falling time set, the target energy storage power and the current energy storage power.

[0230] In the several embodiments provided by the present invention, it should be understood that the disclosed devices, systems and methods can be implemented in other ways. For example, the system embodiments described above are only illustrative, and actual implementation may have other division methods.

[0231] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0232] In addition, each functional module in each embodiment of the present invention may be integrated into one processing unit, each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of hardware plus software functional modules.

[0233] It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

[0234] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A power control method for a gravity energy storage system based on load response, characterized in that: The method comprises: Obtaining the load peak period and load demand power of the regional power grid, and calculating the peak demand power based on the load peak period and load demand power; The pre-constructed gravity energy storage system is divided into working stages according to the peak load period to obtain a gravity energy storage period and a gravity energy release period, wherein the gravity energy storage system includes a plurality of gravity energy storage units, and the gravity energy storage units include: energy storage weights, a transmission bottom bin, a transmission top bin, and a transmission belt; During the gravity energy storage period, the current energy storage capacity, current energy storage power and current gravity load of the gravity energy storage system are obtained, the future load capacity is calculated according to the peak demand capacity and the current energy storage capacity, and the future energy storage capacity of the gravity energy storage system is calculated according to the load peak period and the current energy storage power; Determining whether the future energy storage capacity is greater than the future load capacity; If the future energy storage power is greater than the future load power, the current energy storage power is used as the target energy storage power until the gravity energy release period begins; If the future energy storage power is not greater than the future load power, the power of the gravity energy storage system is controlled by changing the current gravity load to obtain the target energy storage power, and the target energy storage power is maintained until the gravity energy release period begins; During the gravity energy release period, the bottom bin height of the bottom bin and the top bin height of the top bin are obtained, and the falling time of the heavy object is calculated based on the bottom bin height and the top bin height; According to the falling time of the heavy object and the preset first falling time, the falling constraint condition of the nth falling time is constructed, and according to the load demand power and the first falling time, the interval constraint condition of the falling interval is constructed; Based on the first falling time, falling constraints and interval constraints, a falling time set is set, and the power of the gravity energy storage system is controlled according to the falling time set, the target energy storage power and the current energy storage power.

2. The power control method of the gravity energy storage system based on load response according to claim 1 is characterized in that: The calculating of the peak power demand based on the load peak period and the load demand power includes: Obtain the load peak duration of the load peak period, wherein the load peak period is expressed as: T f =(T k T j ) Among them, T f represents the peak load period, T k Indicates the peak start time, T j Indicates the peak end time; The peak power demand is calculated using the following formula: W f =(T j -T k )×P f Among them, W f Indicates the peak power demand, P f Indicates the load demand power.

3. The power control method of the gravity energy storage system based on load response according to claim 2 is characterized in that: The pre-built gravity energy storage system is divided into working stages according to the peak load period to obtain the gravity energy storage period and the gravity energy release period, including: Get the current time and set a release preparation time based on the load demand power; According to the peak start time and the energy release preparation time of the load peak period, the actual start time is determined, wherein the actual start time is expressed as: T a =T k -t z Among them, T a represents the actual start time, t z Indicates the energy release preparation time; The gravity energy storage period is determined according to the current time and the actual start time, and the gravity energy release period is determined according to the actual start time and the peak end time, wherein the gravity energy storage period and the gravity energy release stage are respectively expressed as: T c =(T n T a ),T s =(T a T j ) Among them, T n represents the current time, T c represents the gravity energy storage period, T s Indicates the gravitational energy release period.

4. The power control method of the gravity energy storage system based on load response according to claim 1 is characterized in that: The power regulation of the gravity energy storage system by changing the current gravity load includes: The current unit load set, the weight contact area set and the unit rated speed set of multiple gravity energy storage units are obtained, wherein the current load gravity set, the weight contact area set and the current weight speed set are respectively expressed as: G0={G 01 ,…,G 0n } S={S1,…,S n } v={v1,…,v n } Among them, G0 represents the current unit load set, G 01 Indicates the current unit load of the first gravity energy storage unit, G 0n represents the current unit load of the nth gravity energy storage unit, S represents the weight contact area set, S1 represents the weight contact area of ​​the first gravity energy storage unit, S n represents the weight contact area of ​​the nth gravity energy storage unit, v represents the unit rated speed set, v1 represents the unit rated speed of the first gravity energy storage unit, v n represents the unit rated speed of the nth gravity energy storage unit, and n represents the number of gravity energy storage units; The current unit load is increased according to the preset number of lifted weights to obtain a target unit load set, wherein the target unit load set is expressed as: G={G1,…,G n } G1=G 01 +k s ×m×g,…,G n =G 0n +k s ×m×g Among them, G represents the target unit load set, G1 represents the target unit load of the first gravity energy storage unit, G n represents the target unit load of the nth gravity energy storage unit, k s represents the amount of weight being lifted, m represents the mass of the energy storage weight, and g represents the acceleration due to gravity; According to the target unit load set, the weight contact area set and the unit rated speed set, the target energy storage power is calculated using the following formula: Among them, P m represents the target energy storage power, μ represents the preset efficiency coefficient, δ represents the preset friction loss, i represents the serial number of the gravity energy storage unit, ρ represents the preset air density, C represents the preset resistance coefficient, G i represents the target unit load of the i-th gravity energy storage unit, v i represents the rated speed of the i-th gravity energy storage unit, S i Represents the weight contact area of ​​the i-th gravity energy storage unit.

5. The power control method of the gravity energy storage system based on load response according to claim 1, characterized in that: The calculation of the falling time of the heavy object based on the bottom bin height and the top bin height includes: According to the bottom bin height and top bin height, the falling height is calculated using the following formula: h x =h g -h d Among them, h x Indicates the falling height, h g Indicates the top bin height, h d Indicates the height of the bottom bin; Based on the falling height, the falling time of the weight is calculated using the following formula: Among them, t0 represents the falling time of the weight, and g represents the preset gravitational acceleration.

6. The power control method of the gravity energy storage system based on load response according to claim 5 is characterized in that: The step of constructing the falling constraint condition of the nth falling time length according to the falling time length of the heavy object and the preset first falling time length comprises: The energy release preparation time is taken as the first falling time, and based on the first falling time and the falling time of the heavy object, the following falling constraint condition for the nth falling time is constructed: t n >t1-t0 Among them, t n It represents the duration of the nth drop, t1 represents the duration of the 1st drop, and t0 represents the duration of the heavy object falling.

7. The power control method of the gravity energy storage system based on load response according to claim 6 is characterized in that: The step of constructing the interval constraint condition of the drop interval according to the load demand power and the first drop duration includes: According to the load demand power and the first drop duration, the following drop interval constraint conditions are constructed: and: Among them, Δt represents the falling interval, n represents the number of gravity energy storage units, P f represents the load demand power, g represents the acceleration of gravity, and m represents the mass of the energy storage object.

8. The power control method of the gravity energy storage system based on load response according to claim 7 is characterized in that: The step of setting a drop duration set based on the first drop duration, the drop constraint condition and the interval constraint condition comprises: The falling interval is set according to the interval constraint condition, and the falling duration set of the gravity energy storage system is calculated according to the first falling duration, the falling interval and the falling constraint condition. The falling duration table set is shown as: t={t1,t2,…,t n } t n =t n-1 -Δt Among them, t2 represents the second falling time, t n Indicates the duration of the nth drop, t n-1 Indicates the duration of the n-1th drop.

9. The power control method of the gravity energy storage system based on load response according to claim 8, characterized in that: The power regulation of the gravity energy storage system according to the falling time set, the target energy storage power and the current energy storage power includes: The gravity energy release power of the gravity energy storage system is calculated using the following formula: P s =m×g 2 ×[t1-(n-1)×Δt], and: Among them, P s represents the gravity energy release power, W0 represents the current energy storage capacity, P m represents the target energy storage power; Determine whether the load demand power is greater than the gravity energy release power: If the load demand power is greater than the gravity energy release power, a regulated energy storage weight is obtained by adding a preset number of falling weights to the gravity energy storage system; The gravity energy release power is regulated according to the regulating energy storage weight to obtain a target energy release power, which is expressed as: P l =m×g 2 ×[t1-(n-1)×Δt]+k x ×m×g×h k and: Among them, P l represents the target energy release power, k x Indicates the amount of falling weight, h k Indicates the height of the added falling energy storage weight; Taking the target energy release power as the gravity energy release power, and returning to the step of determining whether the load demand power is greater than the gravity energy release power; If the load demand power is not greater than the gravity energy release power, the gravity energy storage power is maintained until the gravity energy release period ends, completing the power regulation of the gravity energy storage system.

10. A power control system of a gravity energy storage system based on load response, characterized in that: The system comprises: A power grid load acquisition module is used to obtain the peak load period and load demand power of the regional power grid, calculate the peak demand power based on the peak load period and load demand power, divide the pre-built gravity energy storage system into working stages according to the peak load period, and obtain the gravity energy storage period and the gravity energy release period, wherein the gravity energy storage system includes a plurality of gravity energy storage units, and the gravity energy storage units include: energy storage weights, a transmission bottom bin, a transmission top bin, and a transmission belt; The energy storage power calculation module is used to obtain the current energy storage power, current energy storage power and current gravity load of the gravity energy storage system during the gravity energy storage period, calculate the future load power according to the peak demand power and the current energy storage power, and calculate the future energy storage power of the gravity energy storage system according to the load peak period and the current energy storage power; The energy storage power control module is used to determine whether the future energy storage power is greater than the future load power. If the future energy storage power is greater than the future load power, the current energy storage power is used as the target energy storage power until the gravity energy release period begins. If the future energy storage power is not greater than the future load power, the power of the gravity energy storage system is controlled by changing the current gravity load to obtain the target energy storage power, and the target energy storage power is maintained until the gravity energy release period begins. The energy release power control module is used to obtain the bottom bin height of the bottom bin and the top bin height of the top bin during the gravity energy release period, calculate the falling time of the heavy object based on the bottom bin height and the top bin height, construct the falling constraint condition of the nth falling time according to the falling time of the heavy object and the preset first falling time, construct the interval constraint condition of the falling interval according to the load demand power and the first falling time, set the falling time set based on the first falling time, the falling constraint condition and the interval constraint condition, and perform power control on the gravity energy storage system according to the falling time set, the target energy storage power and the current energy storage power.

Images