CN106961150B - Control method and system of composite energy storage battery - Google Patents
Control method and system of composite energy storage battery Download PDFInfo
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- CN106961150B CN106961150B CN201610016126.7A CN201610016126A CN106961150B CN 106961150 B CN106961150 B CN 106961150B CN 201610016126 A CN201610016126 A CN 201610016126A CN 106961150 B CN106961150 B CN 106961150B
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- 239000002131 composite material Substances 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000004146 energy storage Methods 0.000 title claims abstract description 38
- 238000010248 power generation Methods 0.000 claims abstract description 50
- 239000002253 acid Substances 0.000 claims description 64
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical group [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 52
- 229910052744 lithium Inorganic materials 0.000 claims description 52
- 238000007599 discharging Methods 0.000 claims description 20
- 238000005070 sampling Methods 0.000 claims description 15
- 239000000126 substance Substances 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 16
- 230000000295 complement effect Effects 0.000 description 7
- 230000002035 prolonged effect Effects 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 4
- 230000036541 health Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
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- 238000004891 communication Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000001010 compromised effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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- H02J7/0003—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
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Abstract
The invention relates to the field of electrical control, in particular to a control method and a control system of a composite energy storage battery. After the alternating current electric energy generated by the power generation module is converted into direct current electric energy, the direct current electric energy is output by a direct current bus; the inverter converts the direct current electric energy into alternating current electric energy suitable for the corresponding load and then provides the alternating current electric energy for the corresponding load; when the alternating current electric energy generated by the power generation module is more than the alternating current electric energy required by the load, converting the excessive alternating current electric energy into direct current electric energy, and storing the direct current electric energy in the energy type battery and/or the power type battery through the control of a battery controller; when the alternating current power generated by the power generation module is less than the alternating current power required by the load, the battery controller controls the energy type battery and/or the power type battery to provide power for the load, wherein the power density of the energy type battery is less than that of the power type battery; the energy density of the energy type battery is greater than that of the power type battery.
Description
Technical Field
The invention relates to the field of electrical control, in particular to a control method and a control system of a composite energy storage battery.
Background
At present, a wind-solar hybrid system is a distributed energy power supply system, and generally comprises four major components, namely a wind power generator, a photovoltaic module, a wind-solar hybrid controller, a storage battery (usually a lead-acid battery) and an inverter, as shown in fig. 1, the wind-solar hybrid power supply system can solve the power utilization problem in remote areas or areas with inconvenient power supply. For example, wind power generators convert wind energy into three-phase alternating current for output, and permanent magnet generators are generally adopted, and small wind power generators do not generally have a pitch function. The photovoltaic module converts solar energy into direct current electric energy to be output, the wind-solar hybrid controller has the function of converting alternating current electric energy output by the permanent magnet wind driven generator into direct current electric energy, the battery voltage is matched, the protection of the fan, the photovoltaic reverse power protection and the battery charging protection are realized, and the maximum power tracking of the fan and the photovoltaic can also be realized according to the requirement. The storage battery plays a vital role in the whole system, when the wind and light resource condition is good, the storage battery is used for charging to store the residual electric energy, when the wind and light resource condition is not good, the stored electric energy is output by the storage battery for use by an electric load, and the storage battery is usually a colloid lead-acid battery at present.
The wind-solar hybrid power supply system puts higher demands on the energy density, the power density, the service life and the price of the energy storage battery, which are difficult to meet by the traditional lead-acid battery or lithium battery. The conventional lead-acid battery has a short service life of charging and discharging in a circulating manner, generally only 200-500 times, and the battery of the wind-solar hybrid power supply system needs to be replaced in about one year; with the continuous improvement of the requirement of the power utilization level, the power of the power utilization load is gradually increased, and particularly, the short-time peak power of the load is greatly increased when the short-time high-power load is used. To solve this problem, in addition to the need to equip the wind turbine and photovoltaic module with greater power generation capacity, a larger capacity battery needs to be provided to meet the power demand. The lead-acid battery has high energy density but low power density, so that the parallel connection number of the lead-acid battery can be increased, a method for increasing the configuration capacity of the lead-acid battery is forced to obtain large charge and discharge power, and the volume, the weight and the cost of a system are greatly increased; if the factors in multiple aspects such as power demand, system cost, volume and weight are comprehensively considered, the configuration of the storage battery is more prone to adopt a configuration scheme with high power and minimum energy storage capacity. The storage battery does not work under the working condition of low-current charging and discharging any more, but the high-current charging and discharging can reduce the energy storage utilization rate of the battery and also can reduce the service life of the lead-acid battery.
In addition, the lead-acid battery is too widely used, the monitoring on the electric quantity, unbalance condition, health condition and the like of the lead-acid battery is lacked, the use and maintenance are not facilitated, even if composite energy storage exists, a composite battery assembly is formed by connecting the lithium battery and the lead-acid battery in parallel, the matching requirement on the two batteries is extremely high, the output characteristics of the two batteries cannot be independently and flexibly controlled, and the complementary characteristics of the two batteries cannot be fully exerted, the effect in terms of life and energy utilization is greatly compromised.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a control method and a control system of a composite energy storage battery, which can prolong the service life of the battery.
The invention comprises the following technical scheme:
a control method of a composite energy storage battery, the control method comprising:
after the alternating current electric energy generated by the power generation module is converted into direct current electric energy, the direct current electric energy is output by a direct current bus;
the inverter device converts the direct current electric energy into alternating current electric energy suitable for corresponding loads and then provides the alternating current electric energy for the corresponding loads; wherein the content of the first and second substances,
when the alternating current electric energy generated by the power generation module is more than the alternating current electric energy required by the load, converting the excessive alternating current electric energy into direct current electric energy, and storing the direct current electric energy in an energy type battery and/or a power type battery through the control of a battery controller;
the battery controller controls the energy type battery and/or the power type battery to supply the electric power to the load when the AC power generated by the power generation module is less than the AC power required by the load,
the power density of the energy type battery is smaller than that of the power type battery; the energy density of the energy type battery is greater than that of the power type battery.
Preferably, in the control method, the energy type battery is a lead-acid battery and/or the power type battery is a lithium battery.
Preferably, in the control method, the power type battery is charged when the ac power generated by the power generation module is less than the ac power required by the load; and
when the power type battery is charged to 70% of the battery capacity, the energy type battery starts to be charged and the power type battery is charged in a voltage limiting constant current mode.
Preferably, in the control method, when the energy type battery is charged to 80% of the battery capacity, the energy type battery is charged in a constant voltage current-limiting manner.
Preferably, in the control method, after the energy type battery and the power type battery are fully charged, the battery controller boosts the voltage of the direct current bus and cooperates with the power generation controller to achieve wind and light abandonment. Preferably, in the control method, when the ac power generated by the power generation module is less than the ac power required by the load, the power type battery is preferentially used for discharging when the supply power is less than the load rated power, and the energy type battery starts to discharge when the remaining capacity of the power type battery is 20%.
Preferably, in the control method, when the ac power generated by the power generation module is less than the ac power required by the load, in a discharging process of the power battery, if a discharging current of the power battery is greater than a maximum discharging current allowed by the power battery, the power battery and the energy battery are simultaneously discharged according to a set ratio.
Preferably, in the control method, the control unit,
the battery controller collects direct current bus electric signals at the direct current bus side, and the battery controller controls the working state of the energy type battery and/or the power type battery in real time according to the collected direct current bus electric signals;
the battery controller collects an energy type battery electric signal and controls the working state of the power type battery and/or the energy type battery in real time according to the energy type battery electric signal;
the battery controller collects electric signals of the power type battery and controls the working state of the power type battery and/or the energy type battery in real time according to the electric signals of the power type battery.
Preferably, the control method further includes:
the battery controller detects and/or protects the energy type battery and the power type battery.
Preferably, the control method further includes:
and the battery protection system is used for protecting the power type battery.
A control system of a composite energy storage battery, which is applied to a process that a power generation unit supplies power to a load, and comprises:
an inverter device;
the power generation unit is connected with the load through the inverter device so as to provide electric energy for the load;
the battery pack is respectively connected with the inverter device and the power generation unit so as to store the electric energy output by the power generation unit, and the load acquires the electric energy provided by the battery pack or the power generation unit through the inverter device to work;
a battery controller connected to the battery pack to control charging/discharging of the battery pack;
the battery pack at least comprises an energy type battery and a power type battery, the power density of the energy type battery is smaller than that of the power type battery, and the energy density of the energy type battery is larger than that of the power type battery.
Preferably, the power generation unit includes:
a power generation module generating electric power;
the power generation controller is connected with the power generation module and the inverter device through a direct current bus to convert the electric energy generated by the power generation module; wherein the content of the first and second substances,
the power generation module comprises a photovoltaic assembly and/or a wind driven generator.
Preferably, the battery controller includes:
the direct current bus sampling unit is used for sampling an electric signal of the direct current bus to obtain a direct current bus electric signal;
the battery sampling unit is used for respectively sampling the electric signals of the power battery and the energy battery to obtain a power battery electric signal and an energy battery electric signal;
and the main control module is respectively connected with the direct current bus sampling unit and the battery sampling unit and controls a main loop of the energy type battery and/or a main loop of the power type battery according to the direct current bus electric signal and/or the power type battery electric signal and/or the energy type battery electric signal.
Preferably, the energy type battery is a lead-acid battery and/or the power type battery is a lithium battery.
The invention has the beneficial effects that:
the invention uses the lead-acid battery and the lithium battery as independent individuals, realizes the completely independent charge and discharge control, the adjustment of dynamic power and the energy management of the two batteries through the battery controller, has low requirement on the voltage matching of the two batteries, can be realized within the range of 0-100 percent, and the charging and discharging modes and the charging and discharging power of the two batteries are completely and independently controlled, the flexible distribution and management can be realized according to the current state and the demand condition of the batteries, the individual characteristics of the two batteries are fully exerted on the premise of meeting the requirements, the energy utilization rate of the batteries is improved, the service life of the batteries is prolonged, and through charge and discharge control and energy management, under a common working condition, the lithium battery with a long cycle life is preferentially used, and the lead-acid battery is started only under the requirements of short-time high power and long-time discharge, so that the use frequency of the lead-acid battery is reduced, and the service life of the whole system is prolonged.
Drawings
FIG. 1 is a schematic structural diagram of a wind-solar hybrid power supply system in the prior art;
FIG. 2 is a schematic structural diagram of a composite energy storage control system according to the present invention;
FIG. 3 is a graph showing the variation of power generation and power consumption according to the present invention;
FIGS. 4a-4c are comparative illustrations of battery options according to the present invention;
FIG. 5 is a control circuit diagram of the hybrid battery of the present invention;
FIG. 6 is a control diagram of the battery controller according to the present invention;
FIG. 7 is a flow chart of power management of the battery controller of the present invention;
FIG. 8 is a circuit diagram of the battery controller according to the present invention;
FIG. 9 is a circuit diagram of an IGBT-based battery controller according to the present invention;
fig. 10 is a circuit diagram of a MOSFET-based battery controller according to the present invention.
Detailed Description
In the following embodiments, the technical features may be combined with each other without conflict.
The following further describes embodiments of the present invention with reference to the drawings:
fig. 2 is a schematic structural diagram of a hybrid energy storage-based wind-solar hybrid power supply system according to the present embodiment, in which wind-solar power generation is used as an example of a power generation module in the present embodiment, but the present embodiment is not limited to the above two power generation modes, and specific situations can be set according to actual situations. As shown in fig. 2, two energy storage elements are adopted in the system to work in a matching manner, and one energy storage element has high energy density and can be an energy type battery; an energy storage element has high power density, can be called a power type battery, combines the advantages of the energy storage element and the power type battery, and simultaneously meets the requirements of energy and power under the condition of reducing the size, the weight and the cost as much as possible. The first energy storage element can adopt a lead-acid battery, and has high energy density, low cost and lower power density. The second energy storage element is generally a lithium battery, such as a lithium titanate battery, a lithium iron phosphate battery and the like, and has high power density and energy density, but the current cost is higher. The proportion of the two energy storage elements is reasonably configured according to the local wind and light conditions and the load working conditions of the user so as to achieve the most configuration of the system. In general, the ratio of the energy storage capacity of the lithium battery to that of the lead-acid battery can be 2: 8, and even lower, the specific ratio can be set according to the detailed conditions.
In the prior art, a wind power generator and a photovoltaic module may use a wind-solar hybrid controller, for example, in this embodiment, if other forms of power generation are used, corresponding power generation controllers may be used, that is, the wind-solar hybrid controller may be used as one of the power generation controllers. As shown above, the above-mentioned two types of batteries can be connected to the dc bus, when the power required by the load is less than the power generated by the power generation module, the two types of batteries can store energy according to a set mode, conversely, when the power required by the load is greater than the power generated by the power generation module, the two types of batteries can provide power for the load, except for using composite energy storage, unlike the prior art wind and light complementary power supply system, the energy storage element is hung on the dc bus through a composite battery controller, and the composite battery controller (battery controller) is a core device for implementing energy management of the wind and light complementary power supply system, and its main functions include: power distribution of lead-acid batteries and lithium batteries; the charge and discharge control and the battery protection of lead-acid batteries and lithium batteries; monitoring the electric quantity, the unbalance condition, the health condition and the like of the lead-acid battery and the lithium battery; the wind and light abandoning is realized by matching with a wind and light complementary controller; the power distribution strategy of the composite battery controller ensures that the lithium battery is preferentially used for charging and discharging, the dynamic balance of the system power is maintained, the cycle charging and discharging times of the lead-acid battery are reduced, and the service life of the lead-acid battery is prolonged. The control manner of the battery controller will be described in detail later.
Fig. 3 is a typical graph of wind-solar power generation power and power load power in a day in a certain area, and it can be known that a storage battery in a wind-solar hybrid power supply system needs to be frequently charged and discharged in a day to realize dynamic balance of system power. The cycle charge and discharge life of the lithium battery is 2000-3000 times, and the cycle charge and discharge life of the lead-acid battery is only 200-500 times, as shown in the example shown in fig. 4a, in the embodiment, based on the power distribution strategy of the composite energy storage, the charge and discharge of the lithium battery are preferentially used to ensure the dynamic power balance of the system, and the lead-acid battery is only used when the wind and light conditions are not good or the load electricity consumption is high, and the electric quantity of the lithium battery is insufficient, so that the service life of the lead-acid battery. If the high-rate discharge of the lithium battery and the low-rate discharge of the lead-acid battery are preferentially considered when the high-power load is ensured to run through the power distribution strategy of the composite battery controller, the most effective performances of the system user requirement, cost, volume and weight are obtained. The charge-discharge rate of the lead-acid battery is not more than 0.3C, the configuration scheme of the lead-acid battery is designed according to 0.3C and is shown in fig. 4b, the price of the lead-acid battery in the market is generally 500-700 yuan/kWh, the price of the lithium battery is generally 1500-3000 yuan/kWh, and the price of a Battery Management System (BMS) is included, so the power supply cost can be greatly reduced through the technical scheme of the embodiment.
As shown in fig. 4c, by comparing the above schemes, the power distribution strategy of the composite battery controller ensures that the high-rate discharge of the lithium battery and the low-rate discharge of the lead-acid battery are preferentially considered when the high-power load runs, and the composite battery has obvious advantages in cost, volume and weight. If only pursuit cost, volume and weight, choose lead-acid batteries single energy storage mode for use, lead-acid batteries charging current will be more than 0.5C at most, maximum discharge current is more than 1C at most, and such operating mode can reduce lead-acid batteries and can reduce lead-acid batteries energy utilization and life.
In this embodiment, the two batteries are connected to the dc bus via the composite battery controller, and the charge and discharge control of the two batteries can be realized via the composite battery controller. When the wind power and the solar power are higher than the load power, the lithium battery is preferentially used for charging, no limitation is made on the charging current, the residual electric quantity (SOC) of the lithium battery reaches about 70%, the lead-acid battery is used for charging, meanwhile, the lithium battery is charged in a constant-voltage current-limiting mode, and the lithium battery is guaranteed to be fully charged. After the lithium battery is fully charged, only the lead-acid battery is charged, when the SOC of the lead-acid battery reaches about 80% and is rapidly charged, the lead-acid battery is charged in a constant-voltage current-limiting mode, the voltage of a direct-current bus is automatically raised to a voltage value of wind and light abandoning of a wind and light complementation controller by the aid of residual wind and light power, and the whole power supply system is automatically switched into a wind and light abandoning state after the composite battery is fully charged. When the wind power and the solar power are less than the load power, the lithium battery is preferentially used for discharging, and the lead-acid battery is used for discharging when the discharging SOC of the lithium battery reaches about 20 percent; the lithium battery active electric water pump has short working time but high power, and discharges electricity according to a certain current proportion by the lithium battery and the lead-acid battery under the working condition of poor wind and light conditions. The charge and discharge of the lithium battery and the lead-acid battery are controlled by the composite battery controller, so that the utilization rate of the battery can be improved, and the service life of the battery can be prolonged. The composite battery controller not only realizes the monitoring of the lithium battery, but also integrates the functions of the lead-acid battery BMS, realizes the monitoring of the SOC, the unbalance degree, the health condition and the like of the lead-acid battery, is favorable for the maintenance of the lead-acid battery, and prolongs the service life of the lead-acid battery. The battery protection system (BMS) in this embodiment can perform battery protection for the lithium battery.
Fig. 5 is a schematic circuit diagram of the composite battery controller, as shown in fig. 5, the schematic circuit diagram is mainly divided into a control loop and a main loop, wherein the main loop includes a main loop of a lead-acid battery and a main loop of a lithium battery, and the two loops share one control loop. In this embodiment, the control circuit includes a first voltage sampling unit (voltage sampling 1) that samples an electrical signal of the dc bus, and according to the sampled electrical signal of the dc bus, the first main control unit (main control 1) and/or the second main control unit (main control 2) controls a working condition of the main circuit of the lithium battery and/or the main circuit of the lead-acid battery, and the second voltage sampling unit samples the electrical signal from the sides of the lithium battery and the lead-acid battery, and also performs corresponding control by the first main control unit and the second main control unit according to the sampled signal. Fig. 6 is a control circuit diagram of the composite battery, the circuit diagram of fig. 6 is mainly divided into a lithium battery control block diagram and a lead-acid battery control block diagram, wherein the control block diagram of each battery also comprises a direct current bus outer ring control and a battery voltage outer ring control, and when the composite battery is subjected to high-power discharge, the two batteries simultaneously complete discharge according to a certain proportion. As shown in fig. 7, the program automatically and sequentially completes the initialization and standby states after being powered on, when the upper stage issues a power-on command, the system enters the pre-charging state, and after the pre-charging is completed, the system first enters the working state of the lithium battery, and then the flow shown in fig. 7 sequentially performs the jump of the normal working condition according to the corresponding state adjustment. As shown in fig. 8, the composite battery controller includes a control circuit portion and a main circuit portion, wherein the control circuit portion is composed of a control board card, a power board card, an interface board card, and the like, and the main circuit portion includes two portions of a main circuit of a lithium battery and a lead-acid battery; the external interface comprises a direct current bus interface, a composite battery interface and a communication interface with a lithium battery BMS and the like.
In this embodiment, based on the connection diagram of fig. 5, an RS485 communication mode is adopted between the interface board and the control board, and the interface board and the control board are connected by a CAN bus, the EPO emergency stop signal CAN control the control loop to stop working for circuit protection, and the first main control unit and the second main control unit CAN also control parameters such as duty ratios of control devices (e.g., the following IGBTs or MOSFETs) in the main circuit of the lithium battery and the main circuit of the lead-acid battery by PWM signals according to electric signals sampled from the dc bus side and the battery side. As shown in fig. 9, from the safety perspective, the system battery voltage of the household type is generally low, the rated voltage is generally 48V, while the dc bus voltage is generally higher, generally 110V or even higher, the battery controller needs to implement the function of dc boosting, and the power can flow in both directions. Meanwhile, considering that the current ripple of the battery can influence the service rate and the service life of the battery, the bidirectional Buck-boost circuit is adopted to realize the alternating parallel connection, a power device which is usually selected in the occasion with higher direct-current bus voltage is an IGBT, and the turn-off and the turn-on of the IGBT can be controlled and adjusted through a control loop. The controllers of the two batteries select the number of the staggered parallel circuits according to the power requirement, and the lithium batteries and the lead-acid batteries in the figure 9 are all staggered parallel connected for 3 circuits. Fig. 10 is a composite battery PCS controller implementation scheme based on MOSFET, different from fig. 9, in which a power device uses MOSFET, except for cross parallel connection, capacity expansion is performed by MOSFET single-tube parallel connection, and the scheme is suitable for a situation with low power and low system dc bus voltage.
As shown in fig. 9 and 10, by means of superimposing current ripples, the output voltages of the lithium battery and the lead-acid battery tend to be stable, and the output voltage fluctuation is prevented from being large, while the switching sensitivity of the MOSFET is higher than that of the IGBT, the switching frequency of the circuit can be increased, and thus the stability of the output voltage can be enhanced.
In summary, the power distribution strategy and control method of the composite battery of the invention preferentially uses the charging and discharging of the lithium battery to realize the dynamic power balance of the wind-solar-energy-storage complementary power supply system, thereby prolonging the service life of the battery, and the charging and discharging control and protection of the composite battery realize the charging control and the discharging control of the lithium battery and the lead-acid battery by coordinating two battery working modes, thereby improving the energy utilization rate and the service life of the battery; the invention realizes independent and flexible charge and discharge control and management of two batteries through the composite battery controller, thereby greatly reducing the requirement of matching the two batteries; the lithium battery has long cycle charge and discharge life, the power balance of the wind-solar complementary power supply system is realized by the charge and discharge of the lithium battery preferentially, and the service life of the lead-acid battery is greatly prolonged; through the charging management of the lithium battery/lead-acid battery, the effective utilization rate of the energy storage electric quantity of the lithium battery and the lead-acid battery is greatly improved, so that the configuration capacity of the lithium battery and the lead-acid battery can be reduced, and the cost, the volume and the weight of a system are reduced; through the matched charging control of the two batteries, the voltage of a direct current bus is controlled by the other battery when wind and light resources are good and the electric quantity of one battery is high, and meanwhile, the battery performs constant-voltage current-limiting control, so that the stability of a wind and light complementary power supply system for herdsmen is ensured, and the utilization rate of a lead-acid battery is improved to the maximum extent; through the discharge management of the lithium battery/lead-acid battery, when a high-power load works for a short time, the high-rate discharge of the lithium battery is ensured, the low-rate discharge of the lead-acid battery is matched, and the output distribution of the two batteries is optimized under the condition of ensuring the load power requirement, so that the service life of the battery is ensured, the configuration of the battery is reduced, and the cost, the volume and the weight are reduced.
While the specification concludes with claims defining exemplary embodiments of particular structures for practicing the invention, it is believed that other modifications will be made in the spirit of the invention. While the above invention sets forth presently preferred embodiments, these are not intended as limitations.
Various alterations and modifications will no doubt become apparent to those skilled in the art after having read the above description. Therefore, the appended claims should be construed to cover all such variations and modifications as fall within the true spirit and scope of the invention. Any and all equivalent ranges and contents within the scope of the claims should be considered to be within the intent and scope of the present invention.
Claims (10)
1. A control method of a composite energy storage battery, the control method comprising:
after the electric energy generated by the power generation module is converted into direct current electric energy, the direct current electric energy is output by a direct current bus;
the inverter device converts the direct current electric energy into alternating current electric energy suitable for corresponding loads and then provides the alternating current electric energy for the corresponding loads; wherein the content of the first and second substances,
when the alternating current electric energy generated by the power generation module is more than the alternating current electric energy required by the load, converting the excessive alternating current electric energy into direct current electric energy, and storing the direct current electric energy in an energy type battery and/or a power type battery through the control of a battery controller;
the battery controller controls the energy type battery and/or the power type battery to supply the electric power to the load when the AC power generated by the power generation module is less than the AC power required by the load,
the power density of the energy type battery is smaller than that of the power type battery; the energy density of the energy type battery is larger than that of the power type battery;
in the control method, the control unit is used for controlling the power supply,
the battery controller collects direct current bus electric signals at the direct current bus side, and the battery controller controls the working state of the energy type battery and/or the power type battery in real time according to the collected direct current bus electric signals;
the battery controller collects an energy type battery electric signal and controls the working state of the power type battery and/or the energy type battery in real time according to the energy type battery electric signal;
the battery controller collects power type battery electric signals and controls the working state of the power type battery and/or the energy type battery in real time according to the power type battery electric signals;
in the control method, after the energy type battery and the power type battery are fully charged, the battery controller promotes the voltage of the direct current bus and is matched with the power generation controller to realize wind and light abandonment.
2. The control method of a composite energy storage battery according to claim 1, characterized in that in the control method, the energy type battery is a lead acid battery and/or the power type battery is a lithium battery.
3. The control method of a composite energy storage battery according to claim 1, characterized in that in the control method, the power type battery is charged when the alternating current power generated by the power generation module is more than the alternating current power required by the load; and
when the power type battery is charged to 70% of the battery capacity, the energy type battery starts to be charged and the power type battery is charged in a voltage limiting constant current mode.
4. The control method of the composite energy storage battery as claimed in claim 3, wherein in the control method, when the energy type battery is charged to 80% of the battery capacity, the energy type battery is charged in a constant voltage current-limiting mode.
5. The control method of the hybrid energy storage battery according to claim 1, wherein in the control method, when the ac power generated by the power generation module is less than the ac power required by the load, the power type battery is preferentially used for discharging when the supply power is less than the rated power of the load, and the energy type battery starts to discharge when the remaining capacity of the power type battery is 20%.
6. The control method of the composite energy storage battery according to claim 5, wherein in the control method, when the alternating current generated by the power generation module is less than the alternating current required by the load, if the discharge current of the power type battery is greater than the maximum discharge current allowed by the power type battery during the discharge of the power type battery, the power type battery and the energy type battery are discharged simultaneously according to a set proportion.
7. The control method of a composite energy storage battery according to claim 1, characterized in that the control method further comprises:
the battery controller detects and/or protects the energy type battery and the power type battery.
8. The control method of a composite energy storage battery according to claim 1, characterized in that the control method further comprises:
and the battery protection system is used for protecting the power type battery.
9. A control system of a composite energy storage battery, which is applied to a process of supplying power to a load by a power generation unit by using the control method of the composite energy storage battery according to any one of claims 1 to 8, the control system comprising:
an inverter device;
the power generation unit is connected with the load through the inverter device so as to provide electric energy for the load;
the battery pack is respectively connected with the inverter device and the power generation unit so as to store the electric energy output by the power generation unit, and the load acquires the electric energy provided by the battery pack or the power generation unit through the inverter device to work;
a battery controller connected to the battery pack to control charging/discharging of the battery pack;
the battery pack at least comprises an energy type battery and a power type battery, the power density of the energy type battery is smaller than that of the power type battery, and the energy density of the energy type battery is larger than that of the power type battery;
the power generation unit includes:
a power generation module generating electric power;
the power generation controller is connected with the power generation module and the inverter device through a direct current bus to convert the electric energy generated by the power generation module; wherein the content of the first and second substances,
the power generation module comprises a photovoltaic assembly and/or a wind driven generator;
the battery controller includes:
the direct current bus sampling unit is used for sampling an electric signal of the direct current bus to obtain a direct current bus electric signal;
the battery sampling unit is used for respectively sampling the electric signals of the power battery and the energy battery to obtain a power battery electric signal and an energy battery electric signal;
and the main control module is respectively connected with the direct current bus sampling unit and the battery sampling unit and controls a main loop of the energy type battery and/or a main loop of the power type battery according to the direct current bus electric signal and/or the power type battery electric signal and/or the energy type battery electric signal.
10. The control system of a composite energy storage battery according to claim 9, characterized in that the energy type battery is a lead acid battery and/or the power type battery is a lithium battery.
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| CN108482150B (en) * | 2018-03-23 | 2020-10-16 | 湖州宏威新能源汽车有限公司 | Energy distribution method, electric-electric hybrid system and storage medium |
| CN111913110B (en) * | 2019-05-10 | 2023-03-14 | 维谛技术有限公司 | Commercial power battery configuration evaluation method and system |
| CN110729947A (en) * | 2019-09-23 | 2020-01-24 | 中国科学院光电研究院 | Mooring ball energy system and control method |
| CN112467774B (en) * | 2021-02-03 | 2021-07-02 | 国网江西省电力有限公司电力科学研究院 | Energy storage system control method and device based on global energy efficiency optimization and SOC self-adaption |
| CN116021118B (en) * | 2023-03-29 | 2023-06-27 | 电王精密电器(北京)有限公司 | Power supply control system of engine welding machine |
| CN117913957A (en) * | 2024-03-19 | 2024-04-19 | 上海采日能源科技有限公司 | Method and device for controlling charge and discharge of battery of hybrid energy storage system and electronic equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102856924A (en) * | 2012-08-29 | 2013-01-02 | 中国能源建设集团广东省电力设计研究院 | Microgrid smooth switch control method and strategy based on composite energy storage |
| CN202737478U (en) * | 2012-08-29 | 2013-02-13 | 中国能源建设集团广东省电力设计研究院 | Combined energy storage apparatus suitable for seamless switching of micro-grid |
| CN103904766A (en) * | 2014-04-04 | 2014-07-02 | 哈尔滨工程大学 | Device and method for controlling hybrid energy storage of super-capacitors and storage batteries |
| CN105207575A (en) * | 2015-09-08 | 2015-12-30 | 江苏绿扬电子仪器集团有限公司 | Hybrid energy storage device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7800247B2 (en) * | 2008-05-30 | 2010-09-21 | Chun-Chieh Chang | Storage system that maximizes the utilization of renewable energy |
| TWI532294B (en) * | 2014-01-09 | 2016-05-01 | Portable compound battery system | |
| CN204243873U (en) * | 2014-12-10 | 2015-04-01 | 陕西理工学院 | The hybrid accumulator of a kind of ultracapacitor and storage battery |
-
2016
- 2016-01-11 CN CN201610016126.7A patent/CN106961150B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102856924A (en) * | 2012-08-29 | 2013-01-02 | 中国能源建设集团广东省电力设计研究院 | Microgrid smooth switch control method and strategy based on composite energy storage |
| CN202737478U (en) * | 2012-08-29 | 2013-02-13 | 中国能源建设集团广东省电力设计研究院 | Combined energy storage apparatus suitable for seamless switching of micro-grid |
| CN103904766A (en) * | 2014-04-04 | 2014-07-02 | 哈尔滨工程大学 | Device and method for controlling hybrid energy storage of super-capacitors and storage batteries |
| CN105207575A (en) * | 2015-09-08 | 2015-12-30 | 江苏绿扬电子仪器集团有限公司 | Hybrid energy storage device |
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