CN114362125A - Energy storage power supply system and control method thereof - Google Patents
Energy storage power supply system and control method thereof Download PDFInfo
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Abstract
The invention provides an energy storage power supply system and a control method thereof, wherein the energy storage power supply system comprises a commercial power network and N load power supply devices, each load power supply device is connected with the commercial power network through an alternating current power supply network, each load power supply device comprises an energy storage module, a power supply conversion module and a control module, the control modules of the load power supply devices are communicated with each other and can receive related power parameters of the load power supply devices, and the judgment and the calculation of the power regulation and control are carried out according to the relevant power parameters of all the load power supply devices, and when detecting that the load power supply device corresponding to the control module needs to call power to the load power supply device with insufficient power according to the judgment and calculation results, controlling the energy storage module to output power to the AC supply network to power an under-powered load powering device via the AC supply network. The invention can realize the sharing of the energy storage power of each load power supply device.
Description
Technical Field
The invention relates to the technical field of energy storage and power supply, in particular to an energy storage and power supply system and a control method thereof.
Background
Referring to fig. 1, the conventional energy storage and power supply system includes a commercial power supply and a plurality of load power supply devices connected to the commercial power supply, each load power supply device generally supplies power to a dc bus through a converter by the commercial power at a power supply end and an energy storage module, respectively, and each user device at a power receiving end and the energy storage module in a charging mode are supplied power by the dc bus through a respective power supply conversion module. However, the existing load power supply devices work independently, and the stored energy power of the load power supply devices cannot be shared.
Disclosure of Invention
The invention provides an energy storage power supply system and a control method thereof, which can solve the technical problem that the energy storage power of each load power supply device of the existing energy storage power supply system cannot be shared.
The energy storage power supply system provided by the first aspect of the invention comprises an alternating current supply network and N load power supply devices, wherein the input end of the alternating current supply network is used for being connected to a commercial power network, and the output end of the alternating current supply network is respectively connected with the N load power supply devices; n > -2;
the load power supply device comprises an energy storage module, a power supply conversion module and a control module; the control module is connected with the alternating current power supply network; the energy storage module is connected with a first conversion input end of the power supply conversion module; a second conversion input end of the power supply conversion module is connected with the alternating current power supply network, and output ends of the power supply conversion module are respectively connected with at least one user device;
the control module is also respectively connected with the power supply conversion module, the energy storage module and at least one user device, and is used for acquiring power signals of the power supply conversion module, the energy storage module and the user device so as to determine related power parameters of the load power supply device;
the control module is in communication with control modules of other of the load power supply apparatuses for:
receiving related power parameters sent by control modules of other load power supply devices;
and when detecting that the load power supply device corresponding to the control module needs to call power to the load power supply device with insufficient power according to the judgment and calculation results, controlling the energy storage module to output power to the alternating current power supply network so as to supply power to the load power supply device with insufficient power through the alternating current power supply network.
The second aspect of the present invention provides a control method for an energy storage and power supply system, where the control method is executed by a control module, and includes:
receiving related power parameters sent by control modules of other load power supply devices;
and when detecting that the load power supply device corresponding to the control module needs to call power to the load power supply device with insufficient power according to the judgment and calculation results, controlling the energy storage module to output power to the alternating current power supply network so as to supply power to the load power supply device with insufficient power through the alternating current power supply network.
Compared with the prior art, the energy storage power supply system and the control method thereof have the following beneficial effects:
the energy storage power supply system comprises a commercial power network and N load power supply devices, wherein each load power supply device is connected with the commercial power network through an alternating current power supply network, each load power supply device comprises an energy storage module, a power supply conversion module and a control module, the control modules of the load power supply devices are communicated with one another, the relevant power parameters of the load power supply devices can be received, the power regulation and control judgment and calculation are carried out according to the relevant power parameters of all the load power supply devices, and when the load power supply devices corresponding to the control modules need to call power to the load power supply devices with insufficient power according to the judgment and calculation results, the energy storage modules are controlled to output power to the alternating current power supply network, so that the load power supply devices with insufficient power can be supplied with energy through the alternating current power supply network. The invention can realize the sharing of the energy storage power of each load power supply device, on one hand, the energy storage power of each load power supply device can be shared to ensure the power supply of the user equipment of the load power supply device with insufficient power when the commercial power is cut off for a long time, and no extra power generation device is needed to generate power to ensure the power supply of the user equipment; on the other hand, the energy storage utilization rate of each load power supply device can be improved, so that the benefit maximization of the distributed power supply framework is fully exerted.
Drawings
FIG. 1 is a block diagram of a prior art energy storage and power supply system provided by the present invention;
fig. 2 is a diagram showing various residual power relationships of the energy storage and power supply system according to the embodiment of the present invention;
fig. 3 is a block diagram of an embodiment of an energy storage and power supply system according to an embodiment of the present invention;
fig. 4 is a block diagram of another embodiment of an energy storage and power supply system according to an embodiment of the present invention.
Fig. 5 is a schematic flowchart of a control method of the energy storage and power supply system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
For the convenience of the reader, the following explains the relevant power parameters presented by the embodiments of the present invention.
Pin_i: the power currently delivered by the ac supply network to the ith load supplying device. If the voltage is negative, the energy storage module of the ith load power supply device is used for delivering power to the alternating current power supply network through the DC-DC unit and the AC-DC unit.
Pbat_i: and the power transmitted to the energy storage module by the direct current bus of the ith load power supply device is opposite in direction.
Pout_i: and the direct current bus of the ith load power supply device transmits the total power of all the corresponding user equipment.
Pr_ac_i: residual power energy of AC-DC unit of ith load power supply device, namely rated power P thereofrate_ac_iMinus Pin_i. For example, when the rated power is 3kW (and the energy storage module is)Front output 3kW), Pin_iAt 1.5kW, P isr_ac_iThe power is 3kW-1.5kW which is 1.5 kW; when the rated power is 3kW, Pin_iAt-1.5 kW, P isr_ac_iThe maximum power conversion amount is 4.5kW (i.e. from 1.5kW requested to 3kW supplied), when only the rated capacity of the AC-DC unit is considered, that is, when the control module determines to supply power to other load power supply devices by its own energy storage module based on the information of the power signal bus, the maximum power conversion amount is 4.5kW (i.e. from 1.5kW requested to 3kW supplied).
Pr_bat_i: the remaining power capacity of the DC-DC unit of the ith load powering arrangement. I.e. its "rated power Prate_dc_iAnd the current energy output maximum power P of the energy storage modulerate_bat_i"less value of Pin_i。
Prate_out_i: the maximum power requirement (related to the number of service boards that can be carried by the load power supply device, which is generally the nominal maximum power consumption) of all accessible user equipments in the ith load power supply device.
Pr_a_i: conservative residual power of the ith load power supply device. I.e. at the maximum required power P of the user equipmentrate_out_iAnd taking into account the rated power (P) of the DC-DC unitrate_dc_i) And the maximum output power P of the energy storage modulerate_bat_iAt the same time, the ith load power supply device can supply the maximum power of the AC power supply network, namely Pr_a_i＝min{Prate_ac_i，min{Prate_dc_i，Prate_bat_i}-Prate_out_i}. The opposite can be defined as the conservative notch power.
Pr_b_i: the current remaining power of the ith load power supply. Namely, the rated power (P) of the DC-DC unit is considered on the premise of meeting the current required power of the user equipmentrate_dc_i) Meanwhile, the ith load power supply device can supply the maximum power of the alternating current power supply network. I.e. Pr_b_i＝min{Prate_ac_i，min{Prate_dc_i，Prate_bat_i}-Pout_i}. The opposite of which can be defined as the current notch power.
Pr_c_i: maximum support power of the ith load power supply device. I.e. only the rated power (P) of the DC-DC unit without considering the current required power of the user equipmentrate_dc_i) Meanwhile, the ith load power supply device can supply the maximum power of the alternating current power supply network. I.e. Pr_c_i＝min{Prate_ac_i，Prate_dc_i，Prate_bat_i}。
In the energy storage and power supply system of the embodiment of the invention, when the energy storage module in each load power supply device is fully charged, the rated output power of the energy storage module is set to be larger than the maximum required power of all user equipment in the load power supply device; setting the sum of the maximum charging power allowed by an energy storage module in the load power supply device and the maximum power capable of discharging at present to be larger than the maximum required power of all user equipment in the load power supply device in any state; and setting a power supply conversion module in the load power supply device, wherein the rated power of the power supply conversion module is greater than the maximum required power of all user equipment in the load power supply device.
To facilitate the reader's intuitive understanding of the above power parameters, please refer to fig. 2. By the 1 st load power supply, the maximum supporting power can be understood as the maximum power that the 1 st load power supply can supply to the ac supply network, so this power is at a maximum. The current residual power refers to the maximum power of the 1 st load power supply device which can support the alternating current power supply network after the power required by the current 1 st load power supply device is preferentially met, so that the power is the second largest; the conservative residual power is the maximum power that can be supported after considering the maximum required power that can be accessed subsequently in the 1 st load power supply device, so that the power is minimum.
As shown in fig. 1, each load power supply device of the conventional energy storage power supply system works independently, and when the commercial power is short of power for a long time and the power of the energy storage module of a certain load power supply device is insufficient, the power supply requirement of the user equipment of the load power supply device cannot be ensured. Therefore, the embodiment of the invention provides an energy storage and power supply system, which can fully exert the maximum benefit of a distributed power supply architecture and realize the maximum energy storage power of each load power supply device, thereby improving the utilization rate of energy storage.
Specifically, fig. 3 shows a block diagram of an energy storage and power supply system provided in an embodiment of the present invention. The energy storage power supply system provided by the embodiment of the invention comprises an alternating current supply network 2 and N load power supply devices 3, wherein the input end of the alternating current supply network 2 is used for being connected to a commercial power network 1, and the output end of the alternating current supply network 2 is respectively connected with the N load power supply devices 3; n > -2;
the load power supply device 3 comprises an energy storage module, a 32 power supply conversion module 31 and a control module 33; the control module 33 is connected with the AC power supply network 2; the energy storage module 32 is connected with a first conversion input end of the power supply conversion module 31; a second conversion input end of the power supply conversion module 31 is connected to the alternating current supply network 2, and output ends of the power supply conversion module 31 are respectively connected to at least one user device;
the control module 33 is further connected to the power supply conversion module 31, the energy storage module 32 and at least one user device, respectively, and is configured to obtain power signals of the power supply conversion module 31, the energy storage module 32 and the user device, so as to determine a related power parameter of the load power supply apparatus 3;
the control module 33 communicates with the control modules 33 of the other load supply apparatuses 3 for:
receiving related power parameters sent by control modules of other load power supply devices;
and when detecting that the load power supply device corresponding to the control module needs to call power to the load power supply device with insufficient power according to the judgment and calculation results, controlling the energy storage module to output power to the alternating current power supply network so as to supply power to the load power supply device with insufficient power through the alternating current power supply network.
In particular, the ac supply network 2 may be understood as a transmission network line, which is used to transmit a mains voltage to the load supply devices.
Specifically, the control module 33 is connected to the power supply conversion module 31 and configured to control the power supply conversion module 31 to convert the commercial power voltage or the voltage output by the energy storage module 32, for example, the control module 33 controls the power supply conversion module 31 to convert an ac commercial power voltage accessed by the load power supply device 3 into a dc voltage and then transmit the dc voltage to each user device.
Based on the energy storage and power supply system provided by the embodiment of the invention, the control modules of the load power supply devices are communicated with each other, the relevant power parameters of the load power supply devices can be received, the judgment and calculation of power regulation and control are carried out according to the relevant power parameters of all the load power supply devices, and when the load power supply devices corresponding to the control modules need to call power to the load power supply devices with insufficient power according to the judgment and calculation results, the energy storage modules are controlled to output power to the alternating current power supply network, so that the load power supply devices with insufficient power can be supplied with power through the alternating current power supply network. The invention can realize the sharing of the energy storage power of each load power supply device, thereby improving the energy storage utilization rate of each load power supply device and further fully exerting the maximum benefit of the distributed power supply architecture.
In an optional embodiment, the control module is further configured to:
and when detecting that other load power supply devices need to call power to the load power supply device with insufficient power according to the judgment and calculation results, sending a power regulation instruction to the control modules of the other load power supply devices, so that the control modules of the other load power supply devices control the corresponding energy storage modules to output power to the alternating current power supply network, and supplying power to the load power supply device with insufficient power through the alternating current power supply network.
In the embodiment of the invention, when determining that other load power supply devices need to transfer power to the load power supply device with insufficient power according to the related power parameters of all the load power supply devices, the power control instruction is sent to the corresponding load power supply device, wherein the power control instruction carries the power transfer value which the corresponding load power supply device needs to transfer to the load power supply device with insufficient power, so that the control module of the load power supply device can control the energy storage module to output the corresponding power to the alternating current power supply network according to the power transfer value when receiving the power control instruction, and further, the energy storage power of each load power supply device is shared.
Referring to fig. 4, fig. 4 is a block diagram illustrating a structure of another implementation manner of the energy storage and power supply system according to the embodiment of the invention. In this embodiment, the power supply conversion module 31 includes an AC-DC unit 311 and a DC-DC unit 312, a first end of the AC-DC unit 311 is connected to the AC power supply network 2, a second end is connected to the control module 33, and third ends are respectively connected to at least one of the user devices; the DC-DC unit 312 has a first terminal connected to the control module 33, a second terminal connected to the energy storage module 32, and a third terminal connected to at least one of the user devices.
Specifically, the AD-DC unit 311 is configured to convert a commercial ac voltage into a DC voltage and transmit the DC voltage to each user device. The DC-DC unit 311 is configured to switch to a boost mode when the energy storage module 32 is in the discharge mode, so as to boost the voltage output by the energy storage module 32 and transmit the boosted voltage to each user equipment through a DC bus; and when the energy storage module 32 is in the charging mode, the voltage reduction mode is switched to reduce the voltage of the remaining voltage of the commercial power and transmit the reduced voltage to the energy storage module 32.
In an alternative embodiment, the control module of any one of the load power supply apparatuses and the control modules of the other load power supply apparatuses transmit the relevant power parameter via a power signal bus.
In the embodiment of the invention, the control module of each load power supply device transmits the related power parameter through the power signal bus, so that the load power supply devices can mutually exchange power information, and the screening, other control and the like of the load power supply devices with insufficient power can be completed.
In an alternative embodiment, the control module stores a load power supply priority list; the load power supply device priority list stores the priority order of N load power supply devices, the priority of the load power supply device is determined according to the importance degree of user equipment connected with the load power supply device, and the higher the importance degree of the user equipment is, the higher the priority of the load power supply device is.
Furthermore, when power sharing of each load power supply device is realized, power supply to the load power supply device with insufficient power should be guaranteed under the condition that power supply of the important user equipment of the load power supply device is not affected. Therefore, the control module of each load power supply device stores the priority of each load power supply device, so that each load power supply device can know the importance degree of user equipment connected with each load power supply device, and can select the corresponding load power supply device according to the priority list of the load power supply device to carry out power transmission during subsequent power regulation. In some cases, each load power supply device can preferentially supply power to the load power supply device with insufficient power and higher priority according to the priority of each load power supply device when calculating that one or more load power supply devices are insufficient in power according to the priority of each load power supply device, and determine whether to supply power to the load power supply device with insufficient power and low priority according to the residual power, so that when the mains supply is powered off for a long time and the energy storage power is insufficient, the power supply of important equipment can be guaranteed without an additional power generation device.
In an optional implementation manner, the determining and calculating of power regulation and control according to the relevant power parameters of all the load power supply devices, and controlling the energy storage module to output power to the ac power supply network when it is detected that the load power supply device corresponding to the control module needs to call power to the load power supply device with insufficient power according to the determining and calculating results, so as to supply power to the load power supply device with insufficient power through the ac power supply network specifically include:
finding out all first power supply devices from all load power supply devices according to the related power parameters of all load power supply devices; the first power supply device is a primary power supply device, and the current maximum output power of an energy storage module or a power supply conversion module of the primary power supply device cannot meet the maximum power requirement of the primary power supply device; the primary power supply device is a load power supply device connected with important user equipment;
with the reliable power supply of all the first power supply devices as a target, judging and calculating power regulation according to the related power parameters of all the load power supply devices and the priority list of the load power supply devices, and determining power call-out values of the power supply devices to be called out and the power supply devices to be called out according to the judgment and calculation results; the power supply device to be called is a load power supply device which needs to call power to the alternating current power supply network;
and when the load power supply device corresponding to the control module is the power supply device needing to be called, outputting a corresponding power calling value to the alternating current supply network, so that the alternating current supply network collects the power calling values of all the power supply devices needing to be called and then distributes power to all the first power supply devices.
In some embodiments, the load power supply device connected to the important user equipment is defined as a primary power supply device, wherein the primary power supply device is the load power supply device connected to the important user equipment, and the primary power supply device cannot be powered off. Therefore, the power supply reliability of important user equipment is taken as a target, and the power supply device needing to be called out and supplied to the first power supply device is determined according to the related power parameters and the priority of the other load power supply devices. The load power supply device with low priority preferentially supplies power to the first power supply device, because the user equipment of the load power supply device with low priority can accept longer power-off time.
In an optional embodiment, the relevant power parameters of the load power supply device include various types of remaining power, conservative notch power and maximum required power of the load power supply device; wherein the various types of residual power include a conservative residual power, a current residual power and a maximum support power; the conservative notch power is defined as the inverse of the conservative residual power.
Then, the method for determining the power regulation and control according to the relevant power parameters of all the load power supply devices and the priority list of the load power supply devices and determining the power callout values of the power supply devices to be callout and the power supply devices to be callout according to the determination and calculation results, with the reliable power supply of all the first power supply devices being satisfied as the target, specifically includes (1) to (5):
(1) when the sum of the conservative residual powers of all the second power supply devices is larger than or equal to the total notch power, sequentially inputting the conservative residual power of each second power supply device according to the sequence from low priority to high priority of the load power supply devices for accumulation until the accumulation result is larger than or equal to the total notch power, obtaining the second power supply devices participating in accumulation calculation, taking the second power supply devices participating in accumulation calculation as power supply devices to be called out, and setting the power calling-out value of each power supply device to be called out as the corresponding conservative residual power; wherein the second power supply device is a load power supply device other than the first power supply device; the total notch power is an absolute value of a sum of conservative notch powers of all the first power supply devices.
Specifically, the sum of the conservative residual powers of all the second power supply devices is greater than or equal to the total notch power, including the following three cases, where n isa、nb、ncThe total number of the primary power supply devices, the total number of the secondary power supply devices and the total number of the tertiary power supply devices in the energy storage power supply system are respectively represented, A, B, C respectively represents all the primary power supply device sets, all the secondary power supply device sets and all the tertiary power supply device sets, and X represents all the first power supply device sets; wherein the content of the first and second substances,
representing the conservative remaining power of the ith tertiary power supply,
the conservative remaining power of the ith secondary power supply,
representing the conservative residual power of the ith primary power supply device;
represents the current remaining power of the ith tertiary power supply,
representing the current remaining power of the ith secondary power supply,
indicates the maximum support power of the ith three-stage power feeding device.
Case 1:
when in use
Then find no more than ncSatisfies the following natural number l:
three-stage power supply device { c at the moment1,c2,…,clThe power supply devices to be called out are three-stage power supply devices selected from all three-stage power supply devices in the order of low priority to high priority, and the power supply devices have respective conservative residual power
As a corresponding power callout value. Therefore, the power supply reliability of the primary power supply device is preferentially ensured, the power supply reliability of the secondary power supply device and the tertiary power supply device is not influenced, and the primary power supply device and the secondary power supply device have sufficient allowance to deal with the sudden change situation of the system power.
Case 2:
when in use
Then find no more than nbSatisfies the following natural number l:
three-stage power supply device at the moment
And secondary power supply unit { b1,b2,…,blAs a power supply device requiring call-out, wherein b1,b2,…,blAnd the priority levels of all the secondary power supply devices are selected from low to high. The power value to be adjusted corresponding to each three-stage power supply device is the respective conservative residual power
The power value to be adjusted corresponding to each secondary power supply device is the respective conservative residual power
Therefore, the power supply reliability of the primary power supply device is preferentially ensured, the power supply reliability of the tertiary power supply device and the secondary power supply device is not influenced, and the primary power supply device has sufficient allowance to deal with the sudden change situation of the system power.
Case 3:
when in use
Then find no more than naSatisfies the following natural number l:
three-stage power supply device at the moment
Two-stage power supply device
And a primary power supply unit { a1,a2,…,alAs a power supply device requiring call-out, wherein { a }1,a2,…,alAnd the priority levels of all the primary power supply devices are selected from low to high. The power value to be adjusted corresponding to each three-stage power supply device is the respective conservative residual power
The power value to be adjusted corresponding to each secondary power supply device is the respective conservative residual power
The power value to be adjusted corresponding to each primary power supply device is the respective conservative residual power
Therefore, the power supply reliability of the primary power supply device is preferentially ensured, and the power supply reliability of the secondary power supply device and the tertiary power supply device is not influenced.
(2) Defining a first remaining power sum as a power sum of the conservative remaining power of all the primary power supply devices, the conservative remaining power of all the secondary power supply devices and the current remaining power of all the tertiary power supply devices in all the second power supply devices; defining a second remaining power sum as a power sum of conservative remaining power of all primary power supply devices in all the second power supply devices, current remaining power of all the secondary power supply devices and current remaining power of all the tertiary power supply devices; defining a third remaining power sum as a power sum of the conservative remaining power of all the primary power supply devices, the current remaining power of all the secondary power supply devices and the maximum support power of all the tertiary power supply devices in all the second power supply devices; the secondary power supply device is a load power supply device connected with secondary user equipment, and the tertiary power supply device is a load power supply device connected with common user equipment; and the priority of the third-level power supply device is lower than that of the second-level power supply device, and the priority of the second-level power supply device is lower than that of the first-level power supply device.
For example, other load power supply devices than the primary power supply device may be further classified into a secondary power supply device and a tertiary power supply device. That is, in the embodiment of the present invention, the load power supply apparatus can be divided into: the power supply system comprises a primary power supply device, a secondary power supply device and a tertiary power supply device. And the priority order is: first-level power supply device > second-level power supply device > third-level power supply device. And for the priority order of each primary power supply device in the primary power supply device set, the priority of each primary power supply device is sequenced according to the principle that the higher the importance degree of the user equipment is, the higher the priority of the load power supply device is. The secondary power supply device is similar to the tertiary power supply device, and the description thereof is omitted.
In the embodiment of the present invention, the remaining powers of the load power supply apparatuses that define the embodiment of the present invention include a conservative remaining power, a current remaining power and a maximum support power, and the remaining powers are described in detail in the foregoing, and are not described again here. It is understood that the priority of each type of remaining power is ranked from low to high, in order of the importance of the remaining power from low to high, see table 1:
TABLE 1
(3) When the conservative residual power sum of all the second power supply devices is smaller than the total notch power and the first residual power sum is larger than or equal to the total notch power, sequentially adding the current residual power of each three-stage power supply device and a first accumulation result according to the sequence from low to high of the priority of the load power supply device until the accumulation result is larger than or equal to the total notch power to obtain second power supply devices participating in accumulation calculation, taking the second power supply devices participating in accumulation calculation as power supply devices to be called out, and setting the power value to be called out of each power supply device to be called out as the residual power of the corresponding category selected by the power supply devices to be called out for participating in accumulation calculation; the first accumulation result is obtained by accumulating the conservative residual power of all the first-stage power supply devices in all the second power supply devices and the conservative residual power of all the second-stage power supply devices.
In the embodiment of the invention, when
Then find no more than ncSatisfies the following natural number l:
three-stage power supply device { c at the moment1,c2,…,clSecondary power supply device
And a primary power supply unit
As a power supply device requiring call-out, { c { therein1,c2,…,clAnd the power supply devices of three levels are selected from the power supply devices of three levels in the order of the priority from low to high. The power value to be adjusted corresponding to each three-stage power supply device is the respective current residual power
The power value to be adjusted corresponding to each secondary power supply device is the respective conservative residual power
The power value to be adjusted corresponding to each primary power supply device is the respective conservative residual power
Therefore, the power supply reliability of the first-stage power supply device is preferentially ensured, the power supply reliability of the second-stage power supply device is not influenced, and the current power supply requirement of the third-stage power supply device is not influenced.
(4) When the first remaining power sum is smaller than the total notch power and the second remaining power sum is larger than or equal to the total notch power, sequentially inputting the current remaining power of each secondary power supply device and a second accumulation result according to the sequence from low to high of the priority of the load power supply device to accumulate until the accumulation result is larger than or equal to the total notch power to obtain a second power supply device participating in accumulation calculation, taking the second power supply device participating in accumulation calculation as a power supply device to be called out, and setting the power value to be called out of each power supply device to be called out as the remaining power of the corresponding category selected by the power supply device to be called out to participate in accumulation calculation; the second accumulation result is obtained by accumulating the current residual power of all the three-stage power supply devices and the conservative residual power of all the first-stage power supply devices in all the second power supply devices.
In the embodiment of the invention, when
Then find no more than nbSatisfies the following natural number l:
will supply the three-stage power supply device
Two-stage power supply device { b1,b2,…,blAnd primary power supply unit
As a power supply device requiring call-out, { b } b1,b2,…,blAnd the priority levels of all the secondary power supply devices are selected from low to high. The power value to be adjusted corresponding to each three-stage power supply device is the respective current residual power
The power value to be adjusted corresponding to each secondary power supply device is the respective conservative residual power
The power value to be adjusted corresponding to each primary power supply device is the respective conservative residual power
Therefore, the power supply reliability of the primary power supply device is preferentially ensured, and the current power supply requirements of the tertiary power supply device and the secondary power supply device are not influenced.
(5) When the second remaining power sum is less than the total notch power and the third remaining power sum is greater than or equal to the total notch power, sequentially inputting the maximum support power and the third accumulation result of each three-stage power supply device in a sequence from low to high according to the priority of the load power supply device, and accumulating until the accumulation result is greater than or equal to the total notch power to obtain a second power supply device participating in accumulation calculation, taking the second power supply device participating in accumulation calculation as a power supply device to be called out, and setting the power value to be called out of each power supply device to be called out as the remaining power of the corresponding category selected by the power supply device to be called out for participating in accumulation calculation; the third accumulation result is the sum of the conservative residual power of all the first-stage power supply devices in all the second power supply devices and the current residual power of all the second-stage power supply devices.
In the embodiment of the invention, when
Then find no more than ncSatisfies the following natural number l:
will supply the three-stage power supply device
Two-stage power supply device
And a primary power supply unit
As a power supply device requiring call-out, { c { therein1,c2,…,clAnd the power supply devices of three levels are selected from the power supply devices of three levels in the order of the priority from low to high. The power value to be regulated corresponding to each three-stage power supply device is the respective maximum support power
The power value to be adjusted corresponding to each secondary power supply device is the respective conservative residual power
The power value to be adjusted corresponding to each primary power supply device is the respective conservative residual power
Therefore, the power supply reliability of the primary power supply device is preferentially ensured, the current power supply requirement of the secondary power supply device is not influenced, and the current power consumption requirement of the tertiary power supply device is abandoned to be met. However, since the three-stage power supply device is connected to a common user equipment, such user equipment can receive a long-time power failure, and therefore, the influence on the power supply system is not great.
In another optional embodiment, the relevant power parameters of the load power supply device include various types of remaining power, conservative notch power, and maximum required power of the load power supply device; wherein the various types of residual power comprise conservative residual power, first residual power and second residual power; the conservative notch power is defined as the inverse of the conservative residual power; the first remaining power is equal to the difference between the current remaining power and the conservative remaining power, and the second remaining power is equal to the difference between the maximum support power and the current remaining power;
then, the determining and calculating of power regulation and control according to the relevant power parameters of all the load power supply devices and the priority list of the load power supply devices and determining the power callout values of the power supply device to be callout and the power supply device to be callout according to the determination and calculation results with the goal of satisfying reliable power supply of all the first power supply devices specifically includes:
obtaining various residual powers of all the second power supply devices; wherein the second power supply device is a load power supply device except for all the first power supply devices;
determining the priority of all the residual power by combining the priority of all the residual power and the priority list of the load power supply device; wherein the classes of remaining power priorities are set to: the priority of the conservative residual power is lower than that of the first residual power, the priority of the first residual power is lower than that of the second residual power, the priority of the conservative residual power with low priority of the load power supply device is lower than that of the conservative residual power with high priority of the load power supply device, the priority of the first residual power with low priority of the load power supply device is lower than that of the first residual power with high priority of the load power supply device, and the priority of the second residual power with low priority of the load power supply device is lower than that of the second residual power with high priority of the load power supply device;
sequentially inputting each residual power for accumulation according to the sequence of the priority levels of all the residual powers from low to high until the accumulation result is larger than or equal to the absolute value of the sum of conservative notch powers of all the first power supply devices;
and taking the second power supply device corresponding to each residual power participating in the accumulated calculation as a power supply device to be called out, and setting the power calling value of the power supply device to be called out as the sum of all types of residual power participating in the accumulated calculation of the power supply device to be called out.
In this embodiment, the various types of remaining power that define the embodiment of the present invention include a conservative remaining power, a first remaining power, and a second remaining power; the first remaining power is a difference between the current remaining power and the conservative remaining power, and may be understood as remaining power that the load power supply device can still output after outputting the conservative remaining power without affecting the current power supply requirement of the corresponding user equipment.
According to the energy storage power supply system provided by the embodiment of the invention, when the mains supply is in short-time power failure or the energy of the energy storage module of the primary power supply device is insufficient, the low-priority residual power capacity in the area can be preferentially allocated to important equipment, so that the power supply reliability of the important user equipment is ensured.
Corresponding to the embodiment of the energy storage and power supply system, the invention also provides an embodiment of a control method of the energy storage and power supply system.
The control method of the energy storage system of the embodiment of the invention is applied to the control module of the energy storage power supply system shown in fig. 3. Referring to fig. 5, the control method includes steps S110 to S120:
s110, receiving related power parameters sent by control modules of other load power supply devices;
and S120, judging and calculating power regulation according to the related power parameters of all the load power supply devices, and controlling the energy storage module to output power to the alternating current power supply network when detecting that the load power supply device corresponding to the control module needs to call power to the load power supply device with insufficient power according to the judgment and calculation results, so as to supply power to the load power supply device with insufficient power through the alternating current power supply network.
In an optional embodiment, the control method further comprises:
and S130, judging and calculating power regulation according to the related power parameters of all the load power supply devices, and sending a power regulation instruction to the control modules of other load power supply devices when detecting that the other load power supply devices need to regulate power to the load power supply device with insufficient power according to the judgment and calculation results, so that the control modules of the other load power supply devices control the corresponding energy storage modules to output power to the alternating current supply network and supply power to the load power supply device with insufficient power through the alternating current supply network.
In an optional implementation manner, the determining and calculating of power regulation and control according to the relevant power parameters of all the load power supply devices, and controlling the energy storage module to output power to the ac power supply network when it is detected that the load power supply device corresponding to the control module needs to call power to the load power supply device with insufficient power according to the determining and calculating results, so as to supply power to the load power supply device with insufficient power through the ac power supply network specifically include:
finding out all first power supply devices from all load power supply devices according to the related power parameters of all load power supply devices; the first power supply device is a primary power supply device, and the current maximum output power of an energy storage module or a power supply conversion module of the primary power supply device cannot meet the maximum power requirement of the primary power supply device; the primary power supply device is a load power supply device connected with important user equipment;
with the reliable power supply of all the first power supply devices as a target, judging and calculating power regulation according to the related power parameters of all the load power supply devices and the priority list of the load power supply devices, and determining power call-out values of the power supply devices to be called out and the power supply devices to be called out according to the judgment and calculation results; the power supply device to be called is a load power supply device which needs to call power to the alternating current power supply network;
and when the load power supply device corresponding to the control module is the power supply device needing to be called, outputting a corresponding power calling value to the alternating current supply network, so that the alternating current supply network collects the power calling values of all the power supply devices needing to be called and then distributes power to all the first power supply devices.
The control method of the energy storage and power supply system provided in this embodiment includes a utility grid, N load power supply devices, each load power supply device is connected to the utility grid through an ac power supply network, each load power supply device includes an energy storage module, a power supply conversion module, and a control module, the control modules of the load power supply devices are in communication with each other and can receive related power parameters of the load power supply devices, and the judgment and the calculation of the power regulation and control are carried out according to the relevant power parameters of all the load power supply devices, and when detecting that the load power supply device corresponding to the control module needs to call power to the load power supply device with insufficient power according to the judgment and calculation results, controlling the energy storage module to output power to the AC supply network to power an under-powered load powering device via the AC supply network. The invention can realize the sharing of the energy storage power of each load power supply device, on one hand, the energy storage power of each load power supply device can be shared to ensure the power supply of the user equipment of the load power supply device with insufficient power when the commercial power is cut off for a long time, and no extra power generation device is needed to generate power to ensure the power supply of the user equipment; on the other hand, the energy storage utilization rate of each load power supply device can be improved, so that the benefit maximization of the distributed power supply framework is fully exerted.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. An energy storage power supply system is characterized by comprising an alternating current supply network and N load power supply devices, wherein the input end of the alternating current supply network is used for being connected to a commercial power network, and the output end of the alternating current supply network is respectively connected with the N load power supply devices; n > -2;
the load power supply device comprises an energy storage module, a power supply conversion module and a control module; the control module is connected with the alternating current power supply network; the energy storage module is connected with a first conversion input end of the power supply conversion module; a second conversion input end of the power supply conversion module is connected with the alternating current power supply network, and output ends of the power supply conversion module are respectively connected with at least one user device;
the control module is also respectively connected with the power supply conversion module, the energy storage module and at least one user device, and is used for acquiring power signals of the power supply conversion module, the energy storage module and the user device so as to determine related power parameters of the load power supply device;
the control module is in communication with control modules of other of the load power supply apparatuses for:
receiving related power parameters sent by control modules of other load power supply devices;
and when detecting that the load power supply device corresponding to the control module needs to call power to the load power supply device with insufficient power according to the judgment and calculation results, controlling the energy storage module to output power to the alternating current power supply network so as to supply power to the load power supply device with insufficient power through the alternating current power supply network.
2. The energy-storing and power-supplying system of claim 1, wherein the control module is further configured to:
and when detecting that other load power supply devices need to call power to the load power supply device with insufficient power according to the judgment and calculation results, sending a power regulation instruction to the control modules of the other load power supply devices, so that the control modules of the other load power supply devices control the corresponding energy storage modules to output power to the alternating current power supply network, and supplying power to the load power supply device with insufficient power through the alternating current power supply network.
3. The energy-storage power supply system according to claim 1, wherein the power supply conversion module comprises an AC-DC unit and a DC-DC unit, a first end of the AC-DC unit is connected to the AC power supply network, a second end of the AC-DC unit is connected to the control module, and third ends of the AC-DC unit are respectively connected to at least one of the user devices; the first end of the DC-DC unit is connected with the control module, the second end of the DC-DC unit is connected with the energy storage module, and the third end of the DC-DC unit is respectively connected with at least one piece of user equipment.
4. The energy-storing and power-supplying system according to claim 1, wherein the control module of any one of the load power-supplying devices and the control modules of the other load power-supplying devices transmit the relevant power parameter through a power signal bus.
5. The energy-storage and power-supply system according to any one of claims 1 to 4, wherein the control module stores a priority list of load power supply devices; the load power supply device priority list stores the priority order of N load power supply devices, the priority of the load power supply device is determined according to the importance degree of user equipment connected with the load power supply device, and the higher the importance degree of the user equipment is, the higher the priority of the load power supply device is.
6. The energy storage power supply system according to claim 5, wherein the judging and calculating of power regulation and control according to the related power parameters of all the load power supply devices, and when it is detected according to the judging and calculating result that the load power supply device corresponding to the control module needs to regulate power to the load power supply device with insufficient power, the energy storage module is controlled to output power to the ac power supply network so as to supply power to the load power supply device with insufficient power through the ac power supply network, specifically comprising:
finding out all first power supply devices from all load power supply devices according to the related power parameters of all load power supply devices; the first power supply device is a primary power supply device, and the current maximum output power of an energy storage module or a power supply conversion module of the primary power supply device cannot meet the maximum power requirement of the primary power supply device; the primary power supply device is a load power supply device connected with important user equipment;
with the reliable power supply of all the first power supply devices as a target, judging and calculating power regulation according to the related power parameters of all the load power supply devices and the priority list of the load power supply devices, and determining power call-out values of the power supply devices to be called out and the power supply devices to be called out according to the judgment and calculation results; the power supply device to be called is a load power supply device which needs to call power to the alternating current power supply network;
and when the load power supply device corresponding to the control module is the power supply device needing to be called, outputting a corresponding power calling value to the alternating current supply network, so that the alternating current supply network collects the power calling values of all the power supply devices needing to be called and then distributes power to all the first power supply devices.
7. The energy-storing and power-supplying system according to claim 6, wherein the relevant power parameters of the load power-supplying device include various types of remaining power, conservative notch power and maximum required power of the load power-supplying device; wherein the various types of residual power include a conservative residual power, a current residual power and a maximum support power; the conservative notch power is defined as the inverse of the conservative residual power;
then, the determining and calculating of power regulation and control according to the relevant power parameters of all the load power supply devices and the priority list of the load power supply devices and determining the power callout values of the power supply device to be callout and the power supply device to be callout according to the determination and calculation results with the goal of satisfying reliable power supply of all the first power supply devices specifically includes:
when the sum of the conservative residual powers of all the second power supply devices is larger than or equal to the total notch power, sequentially inputting the conservative residual power of each second power supply device according to the sequence from low priority to high priority of the load power supply devices for accumulation until the accumulation result is larger than or equal to the total notch power, obtaining the second power supply devices participating in accumulation calculation, taking the second power supply devices participating in accumulation calculation as power supply devices to be called out, and setting the power calling-out value of each power supply device to be called out as the corresponding conservative residual power; wherein the second power supply device is a load power supply device other than the first power supply device; the total notch power is the absolute value of the sum of conservative notch powers of all the first power supply devices;
defining a first remaining power sum as a power sum of the conservative remaining power of all the primary power supply devices, the conservative remaining power of all the secondary power supply devices and the current remaining power of all the tertiary power supply devices in all the second power supply devices; defining a second remaining power sum as a power sum of conservative remaining power of all primary power supply devices in all the second power supply devices, current remaining power of all the secondary power supply devices and current remaining power of all the tertiary power supply devices; defining a third remaining power sum as a power sum of the conservative remaining power of all the primary power supply devices, the current remaining power of all the secondary power supply devices and the maximum support power of all the tertiary power supply devices in all the second power supply devices; the secondary power supply device is a load power supply device connected with secondary user equipment, and the tertiary power supply device is a load power supply device connected with common user equipment; the priority of the third-level power supply device is lower than that of the second-level power supply device, and the priority of the second-level power supply device is lower than that of the first-level power supply device;
when the conservative residual power sum of all the second power supply devices is smaller than the total notch power and the first residual power sum is larger than or equal to the total notch power, sequentially adding the current residual power of each three-stage power supply device and a first accumulation result according to the sequence from low to high of the priority of the load power supply device until the accumulation result is larger than or equal to the total notch power to obtain second power supply devices participating in accumulation calculation, taking the second power supply devices participating in accumulation calculation as power supply devices to be called out, and setting the power value to be called out of each power supply device to be called out as the residual power of the corresponding category selected by the power supply devices to be called out for participating in accumulation calculation; the first accumulation result is obtained by accumulating the conservative residual power of all the first-stage power supply devices in all the second power supply devices and the conservative residual power of all the second-stage power supply devices;
when the first remaining power sum is smaller than the total notch power and the second remaining power sum is larger than or equal to the total notch power, sequentially inputting the current remaining power of each secondary power supply device and a second accumulation result according to the sequence from low to high of the priority of the load power supply device to accumulate until the accumulation result is larger than or equal to the total notch power to obtain a second power supply device participating in accumulation calculation, taking the second power supply device participating in accumulation calculation as a power supply device to be called out, and setting the power value to be called out of each power supply device to be called out as the remaining power of the corresponding category selected by the power supply device to be called out to participate in accumulation calculation; the second accumulation result is obtained by accumulating the current residual power of all the three-stage power supply devices and the conservative residual power of all the first-stage power supply devices in all the second power supply devices;
when the second remaining power sum is less than the total notch power and the third remaining power sum is greater than or equal to the total notch power, sequentially inputting the maximum support power and the third accumulation result of each three-stage power supply device in a sequence from low to high according to the priority of the load power supply device, and accumulating until the accumulation result is greater than or equal to the total notch power to obtain a second power supply device participating in accumulation calculation, taking the second power supply device participating in accumulation calculation as a power supply device to be called out, and setting the power value to be called out of each power supply device to be called out as the remaining power of the corresponding category selected by the power supply device to be called out for participating in accumulation calculation; the third accumulation result is the sum of the conservative residual power of all the first-stage power supply devices in all the second power supply devices and the current residual power of all the second-stage power supply devices.
8. The energy-storing and power-supplying system according to claim 6, wherein the relevant power parameters of the load power-supplying device include various types of remaining power, conservative notch power and maximum required power of the load power-supplying device; wherein the various types of residual power comprise conservative residual power, first residual power and second residual power; the conservative notch power is defined as the inverse of the conservative residual power; the first remaining power is equal to the difference between the current remaining power and the conservative remaining power, and the second remaining power is equal to the difference between the maximum support power and the current remaining power;
then, the determining and calculating of power regulation and control according to the relevant power parameters of all the load power supply devices and the priority list of the load power supply devices and determining the power callout values of the power supply device to be callout and the power supply device to be callout according to the determination and calculation results with the goal of satisfying reliable power supply of all the first power supply devices specifically includes:
obtaining various residual powers of all the second power supply devices; wherein the second power supply device is a load power supply device except for all the first power supply devices;
determining the priority of all the residual power by combining the priority of all the residual power and the priority list of the load power supply device; wherein the classes of remaining power priorities are set to: the priority of the conservative residual power is lower than that of the first residual power, the priority of the first residual power is lower than that of the second residual power, the priority of the conservative residual power with low priority of the load power supply device is lower than that of the conservative residual power with high priority of the load power supply device, the priority of the first residual power with low priority of the load power supply device is lower than that of the first residual power with high priority of the load power supply device, and the priority of the second residual power with low priority of the load power supply device is lower than that of the second residual power with high priority of the load power supply device;
sequentially inputting each residual power for accumulation according to the sequence of the priority levels of all the residual powers from low to high until the accumulation result is larger than or equal to the absolute value of the sum of conservative notch powers of all the first power supply devices;
and taking the second power supply device corresponding to each residual power participating in the accumulated calculation as a power supply device to be called out, and setting the power calling value of the power supply device to be called out as the sum of all types of residual power participating in the accumulated calculation of the power supply device to be called out.
9. A control method based on the energy storage and power supply system according to any one of claims 1 to 8, wherein the control method is executed by a control module and comprises the following steps:
receiving related power parameters sent by control modules of other load power supply devices;
and when detecting that the load power supply device corresponding to the control module needs to call power to the load power supply device with insufficient power according to the judgment and calculation results, controlling the energy storage module to output power to the alternating current power supply network so as to supply power to the load power supply device with insufficient power through the alternating current power supply network.
10. The method according to claim 9, wherein the determining and calculating of power regulation and control according to the power parameters related to all the load power supply devices, and controlling the energy storage module to output power to the ac power supply network when detecting that the load power supply device corresponding to the control module needs to call power to the load power supply device with insufficient power according to the determining and calculating results, so as to supply power to the load power supply device with insufficient power through the ac power supply network, specifically comprises:
finding out all first power supply devices from all load power supply devices according to the related power parameters of all load power supply devices; the first power supply device is a primary power supply device, and the current maximum output power of an energy storage module or a power supply conversion module of the primary power supply device cannot meet the maximum power requirement of the primary power supply device; the primary power supply device is a load power supply device connected with important user equipment;
with the reliable power supply of all the first power supply devices as a target, judging and calculating power regulation according to the related power parameters of all the load power supply devices and the priority list of the load power supply devices, and determining power call-out values of the power supply devices to be called out and the power supply devices to be called out according to the judgment and calculation results; the power supply device to be called is a load power supply device which needs to call power to the alternating current power supply network;
and when the load power supply device corresponding to the control module is the power supply device needing to be called, outputting a corresponding power calling value to the alternating current supply network, so that the alternating current supply network collects the power calling values of all the power supply devices needing to be called and then distributes power to all the first power supply devices.
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