CN111261978B - Energy storage power station winter heat preservation method based on energy storage battery alternating current preheating - Google Patents
Energy storage power station winter heat preservation method based on energy storage battery alternating current preheating Download PDFInfo
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- 238000004146 energy storage Methods 0.000 title claims abstract description 108
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000004321 preservation Methods 0.000 title claims abstract description 18
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 72
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- 230000026676 system process Effects 0.000 claims abstract description 5
- 238000004891 communication Methods 0.000 claims description 8
- 230000000737 periodic effect Effects 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 5
- 230000001066 destructive effect Effects 0.000 abstract 1
- 230000000630 rising effect Effects 0.000 description 6
- 210000004027 cell Anatomy 0.000 description 3
- 238000010792 warming Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/615—Heating or keeping warm
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/627—Stationary installations, e.g. power plant buffering or backup power supplies
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/633—Control systems characterised by algorithms, flow charts, software details or the like
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/635—Control systems based on ambient temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/637—Control systems characterised by the use of reversible temperature-sensitive devices, e.g. NTC, PTC or bimetal devices; characterised by control of the internal current flowing through the cells, e.g. by switching
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
一种基于储能电池交流预热的储能电站冬季保温方法，先由中央管理系统对电池的表面温度信号进行处理，以确定预热交变电流的频率和幅值，并根据需要预热的电池的总数及编号计算每个电池的预热交变电流初始相位，再合成频率、幅值、初始相位以确定每个电池的参考正弦交流电流信息，然后将该参考正弦交流电流信息发到电池所对应的储能双向变换器的控制器中，最后由储能双向变换器对电池输出交流电流进行预热升温，同时，在预热的过程中，中央管理系统持续判断电池的表面温度是否低于设定温度，以确定是否保持升温状态，直至电池的表面温度不低于设定温度时，中央管理系统终止升温。本设计能够实现快速、无损的预热升温，预热效果较好。
A winter heat preservation method for energy storage power stations based on AC preheating of energy storage batteries. First, the central management system processes the surface temperature signal of the battery to determine the frequency and amplitude of the preheating alternating current, and preheats it as needed. The total number and number of batteries calculate the initial phase of the preheating alternating current of each battery, and then synthesize the frequency, amplitude, and initial phase to determine the reference sinusoidal alternating current information of each battery, and then send the reference sinusoidal alternating current information to the battery In the controller of the corresponding energy storage bidirectional converter, the energy storage bidirectional converter finally preheats and warms the output AC current of the battery. At the same time, during the preheating process, the central management system continuously judges whether the surface temperature of the battery is low. At the set temperature, to determine whether to maintain the heating state, until the surface temperature of the battery is not lower than the set temperature, the central management system terminates the heating. The design can realize rapid and non-destructive preheating and heating, and the preheating effect is better.
Description
Technical Field
The invention relates to a heat preservation process of an energy storage battery, belongs to the technical field of winter heat preservation of energy storage power stations, and particularly relates to a winter heat preservation method of an energy storage power station based on alternating-current preheating of the energy storage battery.
Background
The rapid development of electric vehicles in recent years brings a large number of retired power batteries. These retired batteries still have 80% capacity, and if they are directly discarded, they not only waste resources, but also cause environmental pollution. At present, the better solution is to apply the retired batteries to the occasions with relatively simple working conditions, such as energy storage.
The energy storage system is often applied to occasions with the functions of generating energy such as photovoltaic energy, wind energy and the like, mainly plays a role in stabilizing fluctuation, improves the electric energy quality of a power grid and ensures the safety of power supply of the power grid.
The battery is a core component of the energy storage system, however, the battery is extremely sensitive to the ambient temperature, especially under low temperature conditions, the available capacity and power of the battery are greatly reduced, and the charging is difficult, which greatly restricts the development of the battery energy storage system in low temperature areas. Preheating the battery is the effective way of improving battery performance, and current battery preheating mode often relies on external device, like variable resistance or electric capacity, and wherein, utilize variable resistance to preheat, though there is certain effect of preheating, nevertheless can produce and preheat inhomogeneous result, often can produce the lithium cell surface and preheat the effect fine, but the not good problem of effect is preheated to electric core.
The information disclosed in this background section is only for enhancement of understanding of the general background of the patent application and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to overcome the defects and problems that the low-temperature performance of a battery is poor and the aging of the battery is easy to accelerate when the battery works at low temperature in the prior art, and provides an energy storage power station winter heat preservation method based on alternating-current preheating of an energy storage battery, which has a good preheating effect.
In order to achieve the above purpose, the technical solution of the invention is as follows: an energy storage power station winter heat preservation method based on energy storage battery alternating current preheating comprises the following steps: the method comprises the steps that the surface temperature of a battery is collected and uploaded to a central management system, the central management system judges whether the surface temperature of the battery is lower than a set temperature or not, if the surface temperature of the battery is lower than the set temperature and meets a temperature rise condition, the central management system starts a temperature rise step to preheat and raise the temperature of the corresponding battery through an energy storage bidirectional converter, and the temperature rise condition at least comprises that the energy storage bidirectional converter corresponding to the battery is in a standby state at the moment and the battery is not charged or discharged;
meanwhile, in the process of preheating, the central management system continuously judges whether the surface temperature of the battery is lower than the set temperature so as to determine whether the temperature-rising state is kept, and the central management system terminates the temperature-rising state of the battery until the surface temperature of the battery is not lower than the set temperature.
The number of the batteries and the energy storage bidirectional converters is multiple, the batteries and the energy storage bidirectional converters are in one-to-one correspondence, one side of each energy storage bidirectional converter is connected with the corresponding battery, and the other side of each energy storage bidirectional converter is connected with a direct current power grid.
The central management system controls the energy storage bidirectional converter through a controller of the energy storage bidirectional converter, and the energy storage bidirectional converter, the controller and the battery correspond to each other one by one;
the controller collects a temperature signal of the battery, a terminal voltage signal of the battery and a current signal of the battery, the output end of the controller outputs a PWM signal to the energy storage bidirectional converter, and the collection mode of the temperature signal of the battery comprises the step of obtaining the temperature signal from the battery BMS through a temperature sensor or a communication network.
The central management system starts the temperature raising step to preheat and raise the temperature of the corresponding battery through the energy storage bidirectional converter, which is characterized in that: the method comprises the steps that firstly, a central management system processes surface temperature signals of batteries transmitted by a controller to determine the frequency and amplitude of preheating alternating current, the initial phase of the preheating alternating current of each battery is calculated according to the total number and the serial number of the batteries needing preheating and temperature rising, then reference sine alternating current information of each battery is synthesized according to the frequency, the amplitude and the initial phase, then the reference sine alternating current information is transmitted to the controller of an energy storage bidirectional converter corresponding to the batteries through a communication network, and finally, the energy storage bidirectional converter preheats and raises the temperature of alternating current output by the batteries.
The controller compares reference sine alternating current information with current signals of the battery acquired by the current sensor, then carries out operation according to the compared result to generate PWM signals, and then outputs the PWM signals to the energy storage bidirectional converter so that an actual circuit follows the reference sine alternating current.
When the energy storage bidirectional converter preheats and heats the battery, the terminal voltage of the battery meets the following conditions:
Umin≤Uoc≤Umaxwherein, Umax、Umin、UocRespectively representing the maximum voltage value and the minimum voltage value of the battery and the terminal voltage value of the battery measured by the voltage detection device; if the battery terminal voltage exceeds the above range, the voltage is reducedThe flow amplitude value meets the requirements of upper and lower limits of the terminal voltage of the battery.
There is a phase difference between the reference sinusoidal alternating current information between each cell, the phase difference satisfying the following condition:
ψiand i is 2 pi/n, wherein n is the total number of the batteries to be preheated and warmed, i is the sequence number of the batteries in the warming step, and i is 0, 1, 2, … … and n-1.
The reference sinusoidal alternating current information satisfies the following conditions:
Ii(t)＝Asin(2πft+ψi) Where t represents time and f represents the frequency of the alternating current.
The energy storage bidirectional converter preheats and heats the corresponding battery, which means that: the energy storage bidirectional converter outputs alternating current to a corresponding battery to preheat and heat, and the alternating current is sinusoidal alternating current, rectangular wave with positive and negative alternation, pulse wave with positive and negative alternation or periodic positive and negative alternation current;
the periodic positive and negative alternating current has a phase difference, and the phase difference meets the following conditions:
ψiand i is 2 pi/n, wherein n is the total number of the batteries to be preheated and warmed, i is the sequence number of the batteries in the warming step, and i is 0, 1, 2, … … and n-1.
Compared with the prior art, the invention has the beneficial effects that:
1. in the energy storage power station winter heat preservation method based on the alternating-current preheating of the energy storage batteries, when the batteries need to be preheated and heated, the central management system starts the heating step to preheat and heat the corresponding batteries through the energy storage bidirectional converter. Therefore, the preheating and temperature rising effect of the invention is better.
2. In the energy storage power station winter heat preservation method based on the energy storage battery alternating-current preheating, when the battery is preheated and heated, the alternating-current preheating can be realized only by utilizing all bidirectional converters of the energy storage system without adding any additional device, so that the construction cost of the system is greatly reduced, and the loss of a power grid is reduced. Therefore, the invention has high energy utilization rate and low preheating cost.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic flow chart of the operation of the present invention.
FIG. 3 is a vector composite diagram of n sets of alternating current signals in accordance with the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following description and embodiments in conjunction with the accompanying drawings.
Referring to fig. 1-2, a winter heat preservation method for an energy storage power station based on alternating current preheating of an energy storage battery comprises the following steps: the method comprises the steps that the surface temperature of a battery is collected and uploaded to a central management system, the central management system judges whether the surface temperature of the battery is lower than a set temperature or not, if the surface temperature of the battery is lower than the set temperature and meets a temperature rise condition, the central management system starts a temperature rise step to preheat and raise the temperature of the corresponding battery through an energy storage bidirectional converter, and the temperature rise condition at least comprises that the energy storage bidirectional converter corresponding to the battery is in a standby state at the moment and the battery is not charged or discharged;
meanwhile, in the process of preheating, the central management system continuously judges whether the surface temperature of the battery is lower than the set temperature so as to determine whether the temperature-rising state is kept, and the central management system terminates the temperature-rising state of the battery until the surface temperature of the battery is not lower than the set temperature.
The number of the batteries and the energy storage bidirectional converters is multiple, the batteries and the energy storage bidirectional converters are in one-to-one correspondence, one side of each energy storage bidirectional converter is connected with the corresponding battery, and the other side of each energy storage bidirectional converter is connected with a direct current power grid.
The central management system controls the energy storage bidirectional converter through a controller of the energy storage bidirectional converter, and the energy storage bidirectional converter, the controller and the battery correspond to each other one by one;
the controller collects a temperature signal of the battery, a terminal voltage signal of the battery and a current signal of the battery, the output end of the controller outputs a PWM signal to the energy storage bidirectional converter, and the collection mode of the temperature signal of the battery comprises the step of obtaining the temperature signal from the battery BMS through a temperature sensor or a communication network.
The central management system starts the temperature raising step to preheat and raise the temperature of the corresponding battery through the energy storage bidirectional converter, which is characterized in that: the method comprises the steps that firstly, a central management system processes surface temperature signals of batteries transmitted by a controller to determine the frequency and amplitude of preheating alternating current, the initial phase of the preheating alternating current of each battery is calculated according to the total number and the serial number of the batteries needing preheating and temperature rising, then reference sine alternating current information of each battery is synthesized according to the frequency, the amplitude and the initial phase, then the reference sine alternating current information is transmitted to the controller of an energy storage bidirectional converter corresponding to the batteries through a communication network, and finally, the energy storage bidirectional converter preheats and raises the temperature of alternating current output by the batteries.
The controller compares reference sine alternating current information with current signals of the battery acquired by the current sensor, then carries out operation according to the compared result to generate PWM signals, and then outputs the PWM signals to the energy storage bidirectional converter so that an actual circuit follows the reference sine alternating current.
When the energy storage bidirectional converter preheats and heats the battery, the terminal voltage of the battery meets the following conditions:
Umin≤Uoc≤Umaxwherein, Umax、Umin、UocRespectively representing the maximum voltage value and the minimum voltage value of the battery and the terminal voltage value of the battery measured by the voltage detection device; if the battery terminal voltage exceeds the range, the current amplitude is reduced to meet the requirements of upper and lower limits of the battery terminal voltage.
There is a phase difference between the reference sinusoidal alternating current information between each cell, the phase difference satisfying the following condition:
ψii is 2 pi/n, wherein n is the total number of the batteries to be preheated and heated, and i is the battery temperature raising stepThe sequence numbers in the steps, i ═ 0, 1, 2, … …, n-1.
The reference sinusoidal alternating current information satisfies the following conditions:
Ii(t)＝Asin(2πft+ψi) Where t represents time and f represents the frequency of the alternating current.
The energy storage bidirectional converter preheats and heats the corresponding battery, which means that: the energy storage bidirectional converter outputs alternating current to a corresponding battery to preheat and heat, and the alternating current is sinusoidal alternating current, rectangular wave with positive and negative alternation, pulse wave with positive and negative alternation or periodic positive and negative alternation current;
the periodic positive and negative alternating current has a phase difference, and the phase difference meets the following conditions:
ψiand i is 2 pi/n, wherein n is the total number of the batteries to be preheated and warmed, i is the sequence number of the batteries in the warming step, and i is 0, 1, 2, … … and n-1.
The principle of the invention is illustrated as follows:
referring to fig. 3, fig. 3 shows the vector synthesis of the ac signals of all the batteries when two groups are connected in parallel to n groups are connected in parallel in the present invention, and it can be seen from the figure that after the current signals of all the batteries connected in parallel are superimposed, the total current signal is 0, i.e. there is no loss on the dc bus side in the dc power grid.
Example 1:
referring to fig. 1-2, a winter heat preservation method for an energy storage power station based on alternating current preheating of an energy storage battery comprises the following steps: the method comprises the steps that the surface temperature of a battery is collected and uploaded to a central management system, the central management system judges whether the surface temperature of the battery is lower than a set temperature or not, if the surface temperature of the battery is lower than the set temperature and meets a temperature rise condition, the central management system starts a temperature rise step to preheat and raise the temperature of the corresponding battery through an energy storage bidirectional converter, and the temperature rise condition at least comprises that the energy storage bidirectional converter corresponding to the battery is in a standby state at the moment and the battery is not charged or discharged; meanwhile, in the preheating process, the central management system continuously judges whether the surface temperature of the battery is lower than a set temperature or not so as to determine whether the temperature rising state is kept or not, and the central management system stops the temperature rising state of the battery until the surface temperature of the battery is not lower than the set temperature;
the central management system controls the energy storage bidirectional converters through controllers of the energy storage bidirectional converters, the number of the controllers and the number of the batteries are all multiple, and the energy storage bidirectional converters, the controllers and the batteries are in one-to-one correspondence; one side of the energy storage bidirectional converter is connected with a corresponding battery, and the other side of the energy storage bidirectional converter is connected with a direct current power grid; when the energy storage bidirectional converter transmits in the forward direction, the battery discharges to the direct current power grid through the energy storage bidirectional converter, and when the energy storage bidirectional converter transmits in the reverse direction, the direct current power grid charges the battery through the energy storage bidirectional converter. The controller collects a temperature signal of the battery, a terminal voltage signal of the battery and a current signal of the battery, the output end of the controller outputs a PWM signal to the energy storage bidirectional converter, and the collection mode of the temperature signal of the battery comprises the step of obtaining the temperature signal from the battery BMS through a temperature sensor or a communication network.
Example 2:
the basic contents are the same as example 1, except that:
the central management system starts the temperature raising step to preheat and raise the temperature of the corresponding battery through the energy storage bidirectional converter, which is characterized in that: the method comprises the steps that firstly, a central management system processes surface temperature signals of batteries transmitted by a controller to determine the frequency and amplitude of preheating alternating current, the initial phase of the preheating alternating current of each battery is calculated according to the total number and the serial number of the batteries needing preheating and temperature rising, then reference sine alternating current information of each battery is synthesized according to the frequency, the amplitude and the initial phase, then the reference sine alternating current information is transmitted to the controller of an energy storage bidirectional converter corresponding to the batteries through a communication network, and finally, the energy storage bidirectional converter preheats and raises the temperature of alternating current output by the batteries.
Example 3:
the basic content is the same as that of the embodiment 2, except that:
the controller compares reference sine alternating current information with current signals of the battery acquired by the current sensor, then carries out operation according to the compared result to generate PWM signals, and then outputs the PWM signals to the energy storage bidirectional converter so that an actual circuit follows the reference sine alternating current.
The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiment, but equivalent modifications or changes made by those skilled in the art according to the present disclosure should be included in the scope of the present invention as set forth in the appended claims.
Claims (5)
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| CN112670622A (en) * | 2020-12-22 | 2021-04-16 | 山东大学 | Low-temperature lithium ion battery alternating-current preheating method based on constant-current constant-voltage charging and discharging |
| CN112952882B (en) * | 2021-04-13 | 2024-04-12 | 阳光电源股份有限公司 | Energy storage conversion system, control method of energy storage conversion system, and computer-readable storage medium |
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