CN111585333B - Energy control method and energy storage system - Google Patents
Energy control method and energy storage system Download PDFInfo
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- CN111585333B CN111585333B CN202010542009.0A CN202010542009A CN111585333B CN 111585333 B CN111585333 B CN 111585333B CN 202010542009 A CN202010542009 A CN 202010542009A CN 111585333 B CN111585333 B CN 111585333B
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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
- H02J7/342—The other DC source being a battery actively interacting with the first one, i.e. battery to battery charging
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
- H02J7/0014—Circuits for equalisation of charge between batteries
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Abstract
The application provides an energy control method and an energy storage system. In the energy control method, firstly, a preset converter in M direct current converters in an energy storage system performs balance adjustment on the SOC between first energy storage equipment and second energy storage equipment; the master controller in the energy storage system performs power average control on each energy storage device; then, each direct current converter controls the running power of the direct current converter according to the balance adjustment result and the power average control result, so that decoupling of SOC balance adjustment and power average control is realized, compatible management of the first energy storage device and the second energy storage device is realized, and the control reliability in the energy storage system is improved; and moreover, the quick response and the maximum output capacity of the energy storage system are also ensured.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to an energy control method and an energy storage system.
Background
Generally, the internal structure of the energy storage system has two forms, one is as shown in fig. 1a, a plurality of batteries are directly connected in parallel to the dc side of the energy storage converter; alternatively, as shown in fig. 1b, a plurality of batteries are connected in series with their respective dc converters and then connected in parallel to the dc side of the energy storage converter.
In the prior art, in order to meet the capacity expansion requirement of an energy storage system, the simplest capacity expansion mode is to directly connect devices of the same form in parallel on the direct current side of an energy storage converter; however, the two energy storage systems have corresponding problems after capacity expansion, and the capacity expansion requirements of the energy storage system in practical application cannot be met, so that an energy storage system as shown in fig. 2 is generated, and a new battery is connected in series with a self dc converter first and then connected in parallel to the dc side of the energy storage converter.
However, the existing DCDC converter parallel system usually adopts master-slave control or droop control, and for the energy storage system structure shown in fig. 2, compatible management of new and old batteries cannot be achieved, which may affect effective utilization of battery performance.
Disclosure of Invention
In view of this, the present invention provides an energy control method and an energy storage system, so as to solve the problem that the energy storage system shown in fig. 2 cannot perform compatible management on new and old energy storage devices.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
the energy control method is applied to an energy storage system, an energy storage converter in the energy storage system is connected with N first energy storage devices and M second energy storage devices in one-to-one correspondence through M direct current converters, and both N and M are positive integers; the energy control method comprises the following steps: step S103 and steps S101 and S102 executed before step S103; wherein:
s101, a preset converter in the M direct current converters performs balance adjustment on the residual electric quantity SOC between the first energy storage equipment and the second energy storage equipment;
s102, a master controller in the energy storage system performs power average control on each energy storage device;
s103, each direct current converter controls the running power of the direct current converter according to the result of the balance adjustment and the result of the power average control.
Optionally, step S101 includes: and the preset converter determines SOC balance regulation power between the first energy storage device and the second energy storage device according to the current energy storage SOC data.
Optionally, the preset converter determines the SOC balancing regulation power between the first energy storage device and the second energy storage device according to the current energy storage SOC data, and an adopted calculation formula is as follows:
ΔP＝kp(SOCold-SOCnew)
Wherein, Δ P is the SOC balancing regulation power; kp is the adjustment coefficient; SOColdThe SOC average value of each first energy storage device is obtained; SOCnewAnd the SOC value of the second energy storage device is obtained.
Optionally, the preset converter is each of the dc converters, or a master in each of the dc converters.
Optionally, the predetermined converter is each of the dc converters, SOCnewAnd the delta P is the SOC value of each direct current converter corresponding to the second energy storage equipment, and the power is adjusted for the SOC balance of each direct current converter.
Optionally, the predetermined converter is a main unit, SOC, of each of the dc convertersnewAnd Δ P is the SOC average value of each second energy storage device, and is the SOC balance adjustment power issued by the host to each dc converter.
Optionally, step S102 includes: and the master controller determines the average reference power of the direct current converter according to the capacity data of the energy storage system.
Optionally, the master controller determines the average reference power of the dc converter according to the capacity data of the energy storage system, and the calculation formula is as follows:
Pave＝Pall/Nbat
Nbat＝Qall/Qbat
wherein, PaveIs the average reference power; p allA total power scheduled for the energy storage system; n is a radical ofbatFor equivalent energy storage device number, QallIs the total capacity, Q, of the energy storage systembatThe capacity of a single second energy storage device.
Optionally, the master controller is: an internal controller of the energy storage converter, or a system controller in the energy storage system.
Optionally, step S103 includes:
each direct current converter determines the reference power of the direct current converter according to the result of the balance adjustment and the result of the power average control, and performs power amplitude limiting;
each direct current converter determines a reference current thereof according to the reference power after the amplitude limiting thereof and carries out current amplitude limiting;
each direct current converter performs PI regulation on a difference value between the reference current subjected to amplitude limiting and a current actual value of the direct current converter, and determines a modulation wave of the direct current converter;
each of the dc converters modulates itself according to its modulation wave.
Optionally, each dc converter calculates formula I according to its limited reference powerref＝P/UbatDetermining the reference current of the current sensor;
wherein, IrefIs the reference current; p is the reference power after the amplitude limiting of each direct current converter; u shape batAnd the voltage value of the second energy storage device corresponding to each direct current converter.
Optionally, the first energy storage device is connected to the energy storage device of the energy storage system before the second energy storage device.
Another aspect of the present application provides an energy storage system, including: the energy storage system comprises a master controller, an energy storage converter, N first energy storage devices, M direct current converters and M second energy storage devices, wherein N and M are positive integers; wherein:
each first energy storage device is directly connected in parallel to the direct current side of the energy storage converter;
each second energy storage device is connected to the direct current side of the energy storage converter through one corresponding direct current converter;
the master controller is in communication connection with each direct current converter, and the master controller and the direct current converters together realize the energy control method.
Optionally, the master controller is: an internal controller of the energy storage converter; or,
the master controller comprises: and the system controller in the energy storage system is respectively in communication connection with the energy storage converter and each direct current converter, or the system controller realizes communication connection with each direct current converter through an internal controller of the energy storage converter.
Optionally, the energy storage converter is a DCDC converter, and another dc side of the DCDC converter is connected to a dc bus of the new energy power generation system; or,
the energy storage converter is a DCAC converter, and the alternating current side of the DCAC converter is used for being connected with an alternating current power grid.
According to the technical scheme, the invention provides an energy control method which is applied to an energy storage system. In the energy control method, firstly, a preset converter in M direct current converters in an energy storage system performs balance adjustment on the SOC between first energy storage equipment and second energy storage equipment; the master controller in the energy storage system performs power average control on each energy storage device; then, each direct current converter controls the running power of the direct current converter according to the balance adjustment result and the power average control result, so that decoupling of SOC balance adjustment and power average control is realized, compatible management of the first energy storage device and the second energy storage device is realized, and the control reliability in the energy storage system is improved; and moreover, the quick response and the maximum output capacity of the energy storage system are also ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1a and 1b are schematic structural diagrams of two energy storage systems in the prior art;
fig. 2 is a schematic structural diagram of an energy storage system after capacity expansion in the prior art;
fig. 3a and 3b are schematic diagrams of two configurations of the energy storage system provided in the present application;
FIG. 4 is a schematic flow chart of a method of energy control provided herein;
fig. 5 is a control flow diagram of the energy control method in the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In this application, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In order to solve the problem that the energy storage system shown in fig. 2 cannot perform compatible management on the first energy storage device and the second energy storage device, the present application provides an energy storage system, and a specific structure of the energy storage system is shown in fig. 3a and 3b, wherein a dc side of an energy storage converter inside the energy storage system is respectively connected with N first energy storage devices 10, and M second energy storage devices 20 are further connected through M dc converters 30 in a one-to-one correspondence manner.
It should be noted that the first energy storage device 10 is an energy storage device that is connected to the energy storage system before the second energy storage device 20.
The energy storage system can execute the following energy control method, the specific flow of which is shown in fig. 4, and the method comprises the following steps:
s101, a preset converter in the M direct current converters performs balance adjustment on the SOC of the residual electric quantity between the first energy storage equipment and the second energy storage equipment.
The balancing adjustment is an operation of adjusting the SOC between the first energy storage device and the second energy storage device to achieve SOC balancing between the first energy storage device and the second energy storage device.
In the energy storage system, the SOC of the first energy storage equipment is changed while the SOC of the second energy storage equipment is changed, so that the SOC of each second energy storage equipment can be adjusted towards the direction of reducing the difference between the SOC of the first energy storage equipment and the SOC of the second energy storage equipment, and further the SOC balance adjustment between the first energy storage equipment and the second energy storage equipment is realized. In practical application, the SOC balance adjustment between the first energy storage equipment and the second energy storage equipment can be realized by determining the SOC balance adjustment power of each direct current converter corresponding to each second energy storage equipment; specifically, in the process of the balance adjustment, the preset converter determines the SOC balance adjustment power between the first energy storage device and the second energy storage device according to the current energy storage SOC data, and a control flow of the preset converter is specifically shown as 01 in fig. 5.
The current energy storage SOC data comprise SOC average values of the first energy storage devices and SOC values of the second energy storage devices.
In the above step, according to the current energy storage SOC data, a calculation formula for determining the SOC balancing adjustment power between the first energy storage device and the second energy storage device is:
ΔP＝kp(SOCold-SOCnew)
the delta P is the SOC balance adjustment power between the first energy storage device and the second energy storage device; k is a radical ofpFor adjusting the coefficient, the value can be determined according to the specific application environment; SOColdThe SOC average value of each first energy storage device is obtained; SOCnewIs the SOC value of the second energy storage device.
The above equation for calculating the SOC balancing adjustment power between the first energy storage device and the second energy storage device is only an example, and in practical applications, including but not limited to the above example, it is within the scope of the present application without specific limitation.
It should be noted that the default converter is a dummy device, that is, a dc converter that performs equalization adjustment among the M dc converters. Specifically, the preset converter may refer to any one of M dc converters, such as a master of the M dc converters performing master-slave control; at this time, SOCnew in the above formula is the SOC average value of each second energy storage device, that is, during the balancing process, the main machine in the M dc converters is based on the SOC average value SOC of each first energy storage device oldSOC average value SOC of each second energy storage devicenewAnd adjusting the coefficient kpAnd when the current energy storage SOC data exist, determining an SOC balance adjustment power, and sending the SOC balance adjustment power to other direct current converters. The preset converter may also be each of the M dc converters, that is, when the energy storage system adopts a droop control mode, the M dc controllers respectively execute step S101; at this time, SOC in the above formulanewFor the SOC value of the second energy storage device corresponding to each DC converter, namely in the balancing process, the M DC converters respectively obtain the SOC average value SOC of each first energy storage deviceoldSOC value SOC of each second energy storage devicenewAnd adjustment coefficient kpAnd determining the SOC balance adjustment power of the current energy storage SOC data. The equalization adjustment process is not specifically limited, which may be determined according to actual situations, and differences of the equalization adjustment process under different situations will be described in detail below, and will not be described herein again.
And S102, a master controller in the energy storage system performs power average control on each energy storage device.
The power averaging control is an operation of averaging the energy storage system call power to each energy storage device.
Specifically, in the process of power average control, the general controller determines the average reference power of each dc converter according to the capacity data of the energy storage system, and the control flow thereof may be as shown in 02 in fig. 5. Wherein, the capacity data of energy storage system includes: the total capacity of the energy storage system and the capacity of the individual energy storage devices.
It should be noted that, since the second energy storage devices are connected to the dc side of the energy storage converter through their respective dc converters, the master controller can control the power of each second energy storage device by controlling each dc converter; at this time, the master controller can firstly adjust the total capacity Q of the energy storage systemallAnd capacity Q of a single second energy storage device in the energy storage systembatAnd calculating to obtain the equivalent energy storage equipment number N of the second energy storage equipment in the energy storage systembatThe specific calculation formula is Nbat＝Qall/Qbat(ii) a Then, according to the total power P scheduled by the energy storage systemallAnd the number N of equivalent energy storage devicesbatBy calculation of the formula Pave＝Pall/NbatCalculating to obtain the average reference power P of each DC converteraveAnd sends the average power to each direct current converter, thereby completing the average power control of each energy storage device.
Optionally, in practical application, the master controller may be an internal controller of the energy storage converter, or may be a system controller in the energy storage system; if the master controller is an internal controller of the energy storage converter, the master controller calculates to obtain the average reference power P aveThen, the direct current converter can be directly issued to each direct current converter; if the master controller is a system controller in the energy storage system, the master controller calculates to obtain the average reference power PaveThen, the direct current signals can be directly sent to each direct current converter, or forwarded to each direct current converter through an internal controller of the energy storage converter; it is not specifically limited herein and is within the scope of the present application.
The above is only an example of the average reference power calculation formula, and in practical applications, including but not limited to the above examples, it is within the scope of the present application.
It should be noted that, in practical applications, steps S101 and S102 are only required to be executed before step S103, the execution sequence between the two is not specifically limited, and the two may be executed sequentially or simultaneously, and all are within the protection scope of the present application, depending on practical situations.
And S103, controlling the running power of each direct current converter according to the result of the balance adjustment and the result of the power average control.
As shown in fig. 5, the result of the balancing adjustment is the SOC balancing power Δ P of each dc converter itself, or the SOC balancing power Δ P sent by the host to each dc converter; the result of the power average control is the average reference power P sent by the master controller to each DC converter ave。
Specifically, in the process of controlling the self-operating power, each dc converter determines the self-reference power according to the result of the equalization adjustment and the result of the power average control, and performs power limitation, and the control flow is shown as 03 in fig. 5.
In the above step, the calculation method for determining the reference power of each dc converter is:
Pc＝Pave-ΔP
wherein, PcThe reference power of the direct current converter; paveThe average reference power of the direct current converter; and the delta P is the SOC balance adjustment power of each direct current converter, or the SOC balance adjustment power sent to each direct current converter by the host.
It should be noted that, since the dc converter has two operating states, i.e. a charging state and a discharging state, there are two limits to the power limit, one of which is its maximum discharging power (e.g. discharging P shown in fig. 5)max) The other limit is its maximum charging power (charging P as shown in fig. 5)max) (ii) a In addition, the power limiting in this step is specifically: if the reference power exceeds the power limit of the reference powerIf so, limiting the reference power to the power limit value of the reference power; if the reference power does not exceed its own power limit, the reference power is not limited.
Then, each dc converter determines its own reference current according to its own limited reference power, and performs current limitation, and its control flow is shown as 04 in fig. 5.
In the above steps, according to the reference power after self amplitude limiting, a calculation formula for determining the self reference current is as follows:
Iref＝P/Ubat
wherein, IrefIs a reference current; p is the reference power after the amplitude limiting of each direct current converter; u shapebatThe voltage value of the second energy storage device corresponding to each direct current converter.
It should be noted that since the dc converter has two operating states, i.e., a charging state and a discharging state, there are two limits to the current limit, however, considering that the current direction can be represented by the positive and negative current, one limit is the maximum current value (I shown in fig. 5)max) The other limit is the minimum current value of itself (I shown in fig. 5)min) (ii) a In practical application, the current flowing direction of the direct current converter during discharging can be set to be the positive direction of the current, namely the reference current at the moment is greater than zero; in addition, the current limiting in this step is specifically: if the reference current is larger than the maximum current value of the reference current, limiting the reference current to be the maximum current value; if the reference current is smaller than the minimum current value of the reference current, limiting the reference current to be the minimum current value; if the reference current does not exceed the value range of the reference current, the reference current is in the value range of [ minimum current value, maximum current value ] ]In this case, the reference current is not limited.
Then, each DC converter carries out amplitude limiting on the reference current and the actual current value I of the DC converterfedThe difference between the two signals is subjected to PI regulation, and the own modulation wave PWM is determined, and the control flow is shown as 05 in figure 5.
And finally, each direct current converter modulates itself according to its own modulation wave.
It should be noted that after the PI adjustment and modulation in the last two steps, the modulation wave PWM can be sent to each dc converter in the form of a high-low level control signal, and after the dc converter receives the control signal, the current of the dc converter can be adjusted by demodulation, so that the SOC balance of each first energy storage device and each second energy storage device is realized, and the fast scheduling and the maximum output capability of the energy storage system are ensured.
As can be seen from the above description, in the energy control method, the preset converter of the M dc converters controls the SOC balance between the first energy storage device and the second energy storage device through the SOC balance adjustment power Δ P, that is, the preset converter is responsible for performing balance adjustment on the SOC between the first energy storage device and the second energy storage device, and the master controller controls the average reference power P of each dc converter aveThe control power is rapidly scheduled and distributed to be responsible for carrying out power average control on each energy storage device, then each direct current converter controls the running power of the direct current converters according to the balance adjustment result and the power average control result, so that SOC balance control of all batteries can be realized, the rapid response and the maximum output capacity of the system can be ensured, and meanwhile, decoupling of the SOC balance adjustment and the power average control is realized, further, the compatible management of the first energy storage device and the second energy storage device is realized, the control reliability in the energy storage system is improved, and the control method is simple and easy to implement.
Another embodiment of the present application provides an energy storage system, which has a specific structure as shown in fig. 3a, and includes: the energy storage system comprises a master controller 50, an energy storage converter 40, N first energy storage devices 10, M direct current converters 30 and M second energy storage devices 20. Each energy storage device includes at least one battery.
Wherein, N and M are both positive integers, specific values can be determined according to actual situations, and are not specifically limited herein and are within the protection scope of the embodiment of the present application; in practical applications, M may be equal to 1 and N may be equal to 2.
Each first energy storage device 10 is directly connected in parallel to the dc side of the energy storage converter 40; each second energy storage device 20 is connected to the dc side of the energy storage converter 40 through a corresponding dc converter 30; the general controller 50 is connected to each dc converter 30 in communication, and together implements the energy control method provided in the above embodiment. The connected second energy storage devices 20 are independently controlled by the direct current converters 30 connected in series, and the second energy storage devices 20 independently operate, so that the system capacity expansion and capacity increase are facilitated.
Optionally, the general controller 50 may be: an internal controller of the energy storage converter 40; the following steps can be also included: the system controller in the energy storage system, which is not specifically limited herein, is within the scope of the present application, and may be determined according to specific circumstances.
When the general controller 50 is a system controller in the energy storage system, the system controller may be communicatively connected to the energy storage converter 40 and each dc converter 30, respectively, as shown by the dashed lines in fig. 3 a; the system controller may also implement communication connection with each dc converter 30 through an internal controller of the energy storage converter 40, as shown by a dotted line in fig. 3b, which is not specifically limited herein and is within the scope of the present application as the case may be.
Optionally, if the energy storage converter 40 is a DCAC converter, the ac side of the energy storage converter 40 is directly connected to the power grid; or, if the energy storage converter 40 is a DCDC converter, the other dc side of the energy storage converter 40 is connected to a dc bus of the new energy power generation system; the method is not particularly limited, and can be used within the protection scope of the present application according to the actual situation.
The embodiments of the invention are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments can be referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The foregoing is illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the invention in any way. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make many possible variations and modifications to the disclosed solution, or to modify equivalent embodiments, without departing from the scope of the solution, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are within the scope of the technical solution of the present invention, unless the technical essence of the present invention is not departed from the content of the technical solution of the present invention.
Claims (13)
1. An energy control method is characterized by being applied to an energy storage system, wherein energy storage converters in the energy storage system are connected with N first energy storage devices and are connected with M second energy storage devices in a one-to-one correspondence mode through M direct current converters, and N and M are positive integers; the energy control method comprises the following steps: step S103 and steps S101 and S102 executed before step S103; wherein:
s101, a preset converter in the M direct current converters performs balance adjustment on the residual electric quantity SOC between the first energy storage equipment and the second energy storage equipment;
S102, a master controller in the energy storage system calculates the number of equivalent energy storage devices of the second energy storage devices according to the total capacity of the energy storage system and the capacity of a single second energy storage device, and then calculates the average reference power of each direct current converter according to the total power scheduled by the energy storage system and the number of the equivalent energy storage devices so as to perform power average control on each energy storage device;
s103, determining the self reference power of each direct current converter according to the result of the balance adjustment and the result of the power average control, and carrying out power amplitude limiting; each direct current converter determines a reference current thereof according to the reference power after the amplitude limiting thereof and carries out current amplitude limiting; each direct current converter performs PI regulation on a difference value between the reference current subjected to amplitude limiting and a current actual value of the direct current converter, and determines a modulation wave of the direct current converter; and then modulating the self according to the self modulation wave.
2. The energy control method according to claim 1, wherein step S101 includes: and the preset converter determines SOC balance regulation power between the first energy storage device and the second energy storage device according to the current energy storage SOC data.
3. The energy control method according to claim 2, wherein the preset converter determines the SOC balancing regulation power between the first energy storage device and the second energy storage device according to the current energy storage SOC data, and the calculation formula is as follows:
ΔP＝kp(SOCold-SOCnew)
wherein, Δ P is the SOC balance adjustment power; k is a radical ofpIs an adjustment factor; SOColdThe SOC average value of each first energy storage device is obtained; SOCnewAnd the SOC value of the second energy storage device is obtained.
4. The energy control method of claim 3, wherein the predetermined converter is each of the DC converters, or a master in each of the DC converters.
5. The energy control method of claim 4, wherein said predetermined converters are each said DC converters, SOCnewAnd the delta P is the SOC value of each direct current converter corresponding to the second energy storage equipment, and the power is adjusted for the SOC balance of each direct current converter.
6. The energy control method of claim 4, wherein the predetermined converter is a master, SOC, in each of the DC convertersnewAnd Δ P is the SOC average value of each second energy storage device, and is the SOC balance adjustment power issued by the host to each dc converter.
7. The energy control method according to claim 1, wherein an overall controller in the energy storage system calculates an equivalent energy storage device number of the second energy storage device according to a total capacity of the energy storage system and a capacity of a single second energy storage device, and then calculates an average reference power of each dc converter according to a total power scheduled by the energy storage system and the equivalent energy storage device number, and the calculation formula is:
Pave＝Pall/Nbat
Nbat＝Qall/Qbat
wherein, PaveIs the average reference power; p isallA total power scheduled for the energy storage system; n is a radical of hydrogenbatFor equivalent energy storage device number, QallIs the total capacity, Q, of the energy storage systembatThe capacity of a single second energy storage device.
8. The energy control method of claim 1, wherein the overall controller is: an internal controller of the energy storage converter, or a system controller in the energy storage system.
9. The energy control method of claim 1, wherein each of said dc converters calculates formula I based on its clipped reference powerref＝P/UbatDetermining the reference current of the current sensor;
wherein, IrefIs the reference current; p is the reference power after the amplitude limiting of each direct current converter; u shape batAnd the voltage value of the second energy storage device corresponding to each direct current converter.
10. The energy control method of any of claims 1-9, wherein the first energy storage device is an energy storage device that is coupled to the energy storage system prior to the second energy storage device.
11. An energy storage system, comprising: the energy storage device comprises a master controller, an energy storage converter, N first energy storage devices, M direct current converters and M second energy storage devices, wherein N and M are positive integers; wherein:
each first energy storage device is directly connected in parallel to the direct current side of the energy storage converter;
each second energy storage device is connected to the direct current side of the energy storage converter through one corresponding direct current converter;
the general controller is connected with each direct current converter in a communication mode and jointly realizes the energy control method according to any one of claims 1-10.
12. The energy storage system of claim 11, wherein the general controller is: an internal controller of the energy storage converter; or,
the master controller comprises: and the system controller in the energy storage system is respectively in communication connection with the energy storage converter and each direct current converter, or the system controller realizes communication connection with each direct current converter through an internal controller of the energy storage converter.
13. The energy storage system according to claim 11, wherein the energy storage converter is a DC-DC converter, and the other DC side of the DC-DC converter is connected to a DC bus of a new energy power generation system; or,
the energy storage converter is a DC-AC converter, and the alternating current side of the DC-AC converter is used for being connected with an alternating current power grid.
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