CN114362125B - Energy storage and power supply system and control method thereof - Google Patents
Energy storage and 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 mutually communicated, related power parameters of the load power supply devices can be received, power regulation judgment and calculation are carried out according to the related power parameters of all the load power supply devices, and when the load power supply devices corresponding to the control modules are detected to be required to be powered out to supply power to the load power supply devices with insufficient power according to judgment and calculation results, the energy storage module is controlled to output power to the alternating current power supply network so as to supply power to the load power supply devices with insufficient 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.
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 existing energy storage power supply system includes a mains supply and a plurality of load power supply devices connected with the mains supply, where each load power supply device is usually powered by the mains supply and an energy storage module at a power supply end through a converter to supply power to a dc bus during operation, and each user equipment at a power receiving end and the energy storage module in a charging mode are powered by the dc bus through respective power supply conversion modules. 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 power supply network and N load power supply devices, wherein the input end of the alternating current power supply network is used for being connected with a commercial power network, and the output end of the alternating current power 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; the second conversion input end of the power supply conversion module is connected with the alternating current power supply network, and the output end of the power supply conversion module is 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 relevant power parameters of the load power supply device;
The control module is in communication with the control modules of other load power supply devices and is used for:
receiving related power parameters sent by other control modules of the load power supply device;
And 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 judging and calculating results so as to supply energy to the load power supply device with insufficient power through the alternating current power supply network.
A second aspect of the present invention provides a control method of an energy storage power supply system, the control method being performed by a control module, including:
receiving related power parameters sent by other control modules of the load power supply device;
And 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 judging and calculating results so as to supply energy 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 mutually communicated, related power parameters of the load power supply devices can be received, judgment and calculation of power regulation are carried out according to the related power parameters of all the load power supply devices, and when the load power supply devices which correspond to the control modules and need to be regulated to power to the load power supply devices with insufficient power are detected according to judgment and calculation results, the energy storage module is controlled to output power to the alternating current power supply network so as to supply energy to the load power supply devices with insufficient power through the alternating current power supply network. According to the invention, the sharing of the energy storage power of each load power supply device can be realized, on one hand, when the commercial power is cut off for a long time, the user equipment of the load power supply device with insufficient power can be ensured to supply power through the sharing of the energy storage power of each load power supply device, and no additional power generation device is needed to generate power so as 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 architecture can be 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 graph showing various residual power relationships of an energy storage and power supply system according to an embodiment of the present invention;
FIG. 3 is a block diagram of one implementation of an energy storage and delivery system provided by an embodiment of the present invention;
fig. 4 is a block diagram of another implementation of the energy storage and supply system according to an embodiment of the present invention.
Fig. 5 is a flowchart of a control method of an energy storage power supply system according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
For the convenience of the reader, the relevant power parameters presented in the embodiments of the present invention are explained below.
P in_i: the current ac supply network delivers power to the ith load supply device. If negative, the energy storage module of the ith load power supply device transmits power to the alternating current power supply network through the DC-DC unit and the AC-DC unit.
P bat_i: the power transmitted to the energy storage module by the direct current bus of the ith load power supply device is negative, and the negative value represents opposite direction.
P out_i: the dc bus of the i-th load power supply device transfers the total power to all the corresponding user devices.
P r_ac_i: the remaining power energy of the AC-DC unit of the i-th load supply, i.e. its rated power P rate_ac_i minus P in_i. For example, when its rated power is 3kW (and the energy storage module is currently also capable of outputting 3 kW), P in_i is 1.5kW, then P r_ac_i is 3kW-1.5 kw=1.5 kW; when the rated power is 3kW and P in_i is-1.5 kW, then P r_ac_i is 3kW- (-1.5 kW) =4.5 kW, that is, when only the rated capacity of the AC-DC unit is considered, if the control module decides to use the own energy storage module to supply power to other load power supply devices according to the information of the power signal bus, then the maximum power conversion amount is 4.5kW (i.e. from taking 1.5kW to supplying 3 kW).
P r_bat_i: the remaining power capacity of the DC-DC unit of the i-th load power supply device. I.e., its smaller value of "rated power P rate_dc_i and energy storage module currently able to output maximum power P rate_bat_i" minus P in_i.
P rate_out_i: the maximum required power (typically the nominal maximum power consumption, depending on the number of service boards the load supply device can have) for all accessible user devices in the ith load supply device.
P r_a_i: conservative residual power of the ith load power supply device. That is, on the premise of meeting the maximum required power P rate_out_i of the user equipment, and considering the rated power (P rate_dc_i) of the DC-DC unit and the maximum output power P rate_bat_i of the energy storage module, the i-th load power supply device can supply the maximum power of the ac power supply network, that is, P r_a_i＝min{Prate_ac_i,min{Prate_dc_i,Prate_bat_i}-Prate_out_i. The opposite number can be defined as the conservative notch power.
P r_b_i: the current remaining power of the ith load power supply device. Namely, on the premise of meeting the current demand power of the user equipment, the i-th load power supply device can supply the maximum power of the alternating current power supply network while considering the rated power (P rate_dc_i) of the DC-DC unit. I.e., P r_b_i＝min{Prate_ac_i,min{Prate_dc_i,Prate_bat_i}-Pout_i }. The opposite number may be defined as the current notch power.
P r_c_i: maximum support power for the ith load power supply device. That is, the i-th load power supply device can supply the maximum power of the alternating current power supply network while only considering the rated power (P rate_dc_i) of the DC-DC unit without considering the current required power of the user equipment. I.e., P r_c_i＝min{Prate_ac_i,Prate_dc_i,Prate_bat_i }.
In the energy storage power supply system provided by the embodiment of the invention, when the energy storage modules in the load power supply devices are set to be full, the rated output power of the energy storage modules is larger than the maximum required power of all user equipment in the load power supply devices; setting the sum of the maximum allowable charging power and the maximum current dischargeable power of an energy storage module in the load power supply device 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 larger than the maximum required power of all user equipment in the load power supply device.
For the convenience of the reader to intuitively understand the above power parameters, please refer to fig. 2. Taking the 1 st load supply device as an example, the maximum support power is understood to be the maximum power that the 1 st load supply device can supply to the ac power supply network, so this power is the maximum. The current residual power refers to the maximum power which can support the alternating current power supply network by the 1 st load power supply device after the current power required by the 1 st load power supply device is preferentially met, so that the power is the second largest; the conservative surplus power is the maximum power that can be supported after considering the maximum required power that can be accessed later in the 1 st load power supply device, so the power is the minimum.
As shown in fig. 1, each load power supply device of the existing energy storage power supply system works independently, and when the mains supply lacks power for a long time and 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 the energy storage power supply system which can fully exert the benefit maximization of the distributed power supply architecture and realize the maximization of the 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 according to an embodiment of the present invention. The energy storage power supply system provided by the embodiment of the invention comprises an alternating current power supply network 2 and N load power supply devices 3, wherein the input end of the alternating current power supply network 2 is used for being connected with a commercial power network 1, and the output end of the alternating current power 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 to 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 with the alternating current power supply network 2, and output ends of the power supply conversion module 31 are respectively connected with at least one user equipment;
The control module 33 is further connected to the power supply conversion module 31, the energy storage module 32 and at least one user equipment, respectively, for obtaining power signals of the power supply conversion module 31, the energy storage module 32 and the user equipment to determine relevant power parameters of the load power supply device 3;
the control module 33 communicates with other control modules 33 of the load supply device 3 for:
receiving related power parameters sent by other control modules of the load power supply device;
And 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 judging and calculating results so as to supply energy to the load power supply device with insufficient power through the alternating current power supply network.
In particular, the ac power supply network 2 can be understood as a transmission network line for transmitting the mains voltage to the respective load supply.
Specifically, the control module 33 is connected to the power supply conversion module 31, and is configured to control the power supply conversion module 31 to convert the mains 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 the ac mains voltage accessed by the load power supply device 3 into the dc voltage, and then send the dc voltage to each user device.
According to the energy storage power supply system provided by the embodiment of the invention, the control modules of the load power supply devices are mutually communicated, can receive relevant power parameters of the load power supply devices, judge and calculate power regulation and control 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 are detected to be required to call out power to the load power supply devices with insufficient power according to judging and calculating results, the energy storage modules are controlled to output power to the alternating current power supply network so as to supply energy to the load power supply devices with insufficient 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 playing the maximization of the benefit of the distributed power supply architecture.
In an alternative embodiment, the control module is further configured to:
And 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 control modules of other load power supply devices when detecting that other load power supply devices need to regulate power to the load power supply devices with insufficient power according to the judging and calculating 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 power supply network, and supplying energy to the load power supply devices 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 call power to the load power supply device with insufficient power according to the related power parameters of all the load power supply devices, namely, sending a power regulation and control instruction to the corresponding load power supply device, wherein the power regulation and control instruction should carry a power call value of the load power supply device with insufficient power to be called by the corresponding load power supply device, so that a control module of the load power supply device can control an energy storage module to output corresponding power to an alternating current power supply network according to the power call value when receiving the power regulation and control instruction, and further sharing of energy storage power of each load power supply device is realized.
Referring to fig. 4, fig. 4 shows a block diagram of another implementation of the energy storage and supply system according to an embodiment of the present invention. In this embodiment, the power supply conversion module 31 includes an AC-DC unit 311 and a DC-DC unit 312, where 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 first end of the DC-DC unit 312 is connected to the control module 33, the second end is connected to the energy storage module 32, and the third end is connected to at least one of the user devices, respectively.
Specifically, the AD-DC unit 311 is configured to convert the ac voltage of the mains supply into the 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 a discharge mode, so as to boost a voltage output by the energy storage module 32 and transmit the boosted voltage to each user device through a DC bus; and switches to a step-down mode when the energy storage module 32 is in the charging mode, so as to step down the residual voltage of the mains supply and transmit the residual voltage to the energy storage module 32.
In an alternative embodiment, the control module of any one of the load power supply devices and the control modules of the other load power supply devices transmit the relevant power parameters via a power signal bus.
In the embodiment of the invention, the control module of each load power supply device transmits related power parameters through the power signal bus, so that each load power supply device can exchange power information with each other, and screening, other control and the like of the load power supply device with insufficient power can be completed.
In an alternative embodiment, the control module stores a load power device priority list; the priority list of the load power supply devices stores the priority sequence of N load power supply devices, the priority of the load power supply devices is determined according to the importance degree of the user equipment connected with the load power supply devices, and the higher the importance degree of the user equipment is, the higher the priority of the load power supply devices is.
Further, it is considered that when the power sharing of each load power supply device is realized, the power supply of the load power supply device with insufficient power should be ensured under the condition that the power supply of the important user equipment 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 acquire the importance degree of the user equipment connected with each load power supply device, and the corresponding load power supply device can be selected for power transmission according to the priority list of the load power supply device during subsequent power regulation. In some cases, each load power supply device can be used for preferentially supplying power to the load power supply device with insufficient power and higher priority according to the priority of each load power supply device when the power of one or more load power supply devices is calculated to be insufficient according to the priority sequence of each load power supply device, and determining 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 stored energy power is insufficient, the power supply of important equipment can be ensured without an additional power generation device.
In an optional implementation manner, the determining and calculating of the power regulation are performed 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 determining and calculating result, the controlling the energy storage module to output power to the ac power supply network so as to supply energy to the load power supply device with insufficient power through the ac power supply network specifically includes:
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;
The reliable power supply of all the first power supply devices is used as a target, the judgment and calculation of power regulation are carried out according to the related power parameters of all the load power supply devices and the priority list of the load power supply devices, and the power calling-out values of the power supply devices to be called out are determined according to the judgment and calculation results; the power supply device to be called is a load power supply device which is used for calling power to the alternating current power supply network;
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 power supply network, so that the alternating current power supply network collects the power calling values of all the power supply devices needing to be called and distributes power to all the first power supply devices.
In some embodiments, the load power supply device connected to the critical user equipment is defined as a primary power supply device, wherein the primary power supply device is a load power supply device connected to the critical user equipment that is unacceptably powered down. For this purpose, the power supply reliability of the user equipment is important, and the power supply device to be called to the first power supply device is determined according to the relevant power parameters and priorities of other load power supply devices. The low-priority load power supply device preferentially supplies power to the first power supply device, because the power-off time acceptable by the user equipment of the low-priority load power supply device is longer.
In an alternative embodiment, the relevant power parameters of the load power supply device include various residual powers, conservative notch powers and maximum required power of the load power supply device; wherein, the various residual powers comprise conservative residual power, current residual power and maximum supporting power; the conservative notch power is defined as the result of the inverse of the conservative residual power.
And the step of judging and calculating 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 calling-out values of the power supply devices to be called-out and the power supply devices to be called-out according to the judging and calculating results, wherein the method specifically comprises the steps of (1) to (5):
(1) When the total of the conservative residual power of all the second power supply devices is greater than or equal to the total notch power, sequentially adding the conservative residual power of each second power supply device according to the order of the priority of the load power supply devices from low to high until the accumulation result is greater than or equal to the total notch power to obtain the second power supply devices participating in accumulation calculation, taking the second power supply devices participating in accumulation calculation as power supply devices needing to be called, and setting the power calling value of each power supply device needing to be called 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 all the conservative notch powers of the first power supply device.
Specifically, the total conservative remaining power sum of all the second power supply devices is greater than or equal to the total notch power, including the following three cases, wherein n a、nb、nc represents the total number of the first-stage power supply devices, the total number of the second-stage power supply devices and the total number of the third-stage power supply devices in the energy storage power supply system, A, B, C represents all the first-stage power supply device sets, all the second-stage power supply device sets, all the third-stage power supply device sets, and X represents all the first power supply device sets; wherein,Representing the conservative residual power of the ith three-stage power supply device,/>Conservative residual power of the ith secondary power supply device,/>Representing the conservative residual power of the ith primary power supply device; /(I)Representing the current remaining power of the ith three-stage power supply device,/>Representing the current remaining power of the ith secondary power supply device,/>The maximum support power of the ith three-stage power supply device is shown.
Case 1:
When (when) Then a natural number l not greater than n c is found to satisfy:
At this time, the three-stage power supply device { c 1,c2,…,cl } is used as the power supply device to be called out, which is the three-stage power supply device selected according to the order of priority from low to high in all three-stage power supply devices, and the respective power remains 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 power supply reliability of the tertiary power supply device are not affected, and the primary power supply device and the secondary power supply device have sufficient allowance to deal with the sudden change of system power.
Case 2:
When (when) Then a natural number l not greater than n b is found to satisfy:
Three-stage power supply device at this time And a secondary power supply device { b 1,b2,…,bl } as a call-out power supply device, wherein { b 1,b2,…,bl } is a secondary power supply device selected in order of priority from low to high among all the secondary power supply devices. The corresponding power value to be regulated of each three-stage power supply device is the corresponding conservative residual powerThe power value to be regulated corresponding to each secondary power supply device is the conservation 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 affected, and the primary power supply device has sufficient allowance to cope with the sudden system power change condition.
Case 3:
When (when) Then a natural number l not greater than n a is found to satisfy:
Three-stage power supply device at this time Two-stage power supply device/>And a primary power supply device { a 1,a2,…,al } as a call-out power supply device, wherein { a 1,a2,…,al } is a secondary power supply device selected in order of priority from low to high among all the primary power supply devices. The power value to be regulated corresponding to each three-level power supply device is the conservation residual power/>The power value to be regulated corresponding to each secondary power supply device is the conservation residual power/>The power value to be regulated corresponding to each stage of power supply device is the conservation 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 affected.
(2) Defining a first residual power sum as a power sum of conservative residual power of all primary power supply devices, conservative residual power of all secondary power supply devices and current residual power of all tertiary power supply devices in all second power supply devices; defining a second residual power sum as a power sum of conservative residual power of all primary power supply devices, current residual power of all secondary power supply devices and current residual power of all tertiary power supply devices in all second power supply devices; defining a third residual power sum as a power sum of conservative residual power of all primary power supply devices in all second power supply devices, current residual power of all secondary power supply devices and maximum supporting power of all tertiary power supply devices; the secondary power supply device is a load power supply device connected with the secondary user equipment, and the tertiary power supply device is a load power supply device connected with the 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, load power supply devices other 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 device may be divided into: the device comprises a primary power supply device, a secondary power supply device and a tertiary power supply device. And the priority order is: the primary power supply device is a secondary power supply device and the tertiary power supply device is a tertiary power supply device. And sequencing the priority of each primary power supply device according to the principle that the priority of the load power supply device with higher importance of the user equipment is higher for the priority sequence of each primary power supply device in the primary power supply device set. The secondary power supply device and the tertiary power supply device are similar, and will not be described in detail here.
In the embodiment of the present invention, various types of residual power defining the load power supply devices in the embodiment of the present invention include conservative residual power, current residual power and maximum supporting power, and various types of residual power have been described in detail in the foregoing, and will not be described herein. It will be appreciated that the priority of each type of residual power is ordered from low to high by the importance of the residual power, 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-level power supply device and a first accumulation result according to the priority of the load power supply devices from low to high 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 needing to be called, and setting the power value needing to be called of each power supply device needing to be called as the residual power of the corresponding type selected by the power supply devices needing to be called and participating in accumulation calculation; the first accumulation result is obtained by accumulating the conservative residual power of all the primary power supply devices and the conservative residual power of all the secondary power supply devices in all the second power supply devices.
In the embodiment of the invention, when
Then a natural number l not greater than n c is found to satisfy:
at this time, three-stage power supply device { c 1,c2,…,cl }, two-stage power supply device And primary power supply means/>As the power supply device to be called out, wherein { c 1,c2,…,cl } is a three-stage power supply device selected in order of priority from low to high among all three-stage power supply devices. The corresponding power value to be regulated out of each three-level power supply device is the current residual power/>The power value to be regulated corresponding to each secondary power supply device is the conservation residual power/>The power value to be regulated corresponding to each stage of power supply device is the conservation residual power/> Therefore, the power supply reliability of the primary power supply device is preferentially ensured, the power supply reliability of the secondary power supply device is not influenced, and the current power supply requirement of the tertiary power supply device is not influenced.
(4) When the first residual power sum is smaller than the total notch power and the second residual power sum is larger than or equal to the total notch power, sequentially adding the current residual power of each secondary power supply device and a second accumulation result according to the order of the priority of the load power supply device from low to high 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 needing to be called out, and setting the power value needing to be called out of each power supply device needing to be called out as the residual power of the corresponding category selected by the power supply device needing to be called out and participating in accumulation calculation; the second accumulation result is obtained by accumulating the current residual power of all 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 a natural number l not greater than n b is found to satisfy:
Three-stage power supply device Secondary power supply { b 1,b2,…,bl } and primary power supply/>As the power supply device to be called out, wherein { b 1,b2,…,bl } is a secondary power supply device selected in order of priority from low to high among all the secondary power supply devices. The corresponding power value to be regulated out of each three-level power supply device is the current residual power/>The power value to be regulated corresponding to each secondary power supply device is the conservation residual power/>The power value to be regulated corresponding to each stage of power supply device is the conservation 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 smaller than the total notch power and the third remaining power sum is larger than or equal to the total notch power, sequentially adding the maximum supporting power of each three-level power supply device and a third accumulation result according to the order of the priority of the load power supply device from low to high 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 needing to be called, and setting the power value needing to be called of each power supply device needing to be called as the remaining power of the corresponding category selected by the power supply device needing to be called and participating in accumulation calculation; and the third accumulation result is the sum of the conservative residual power of all the primary power supply devices and the current residual power of all the secondary power supply devices in all the second power supply devices.
In the embodiment of the invention, when
Then a natural number l not greater than n c is found to satisfy:
Three-stage power supply device Two-stage power supply device/>And primary power supply means/>As the power supply device to be called out, wherein { c 1,c2,…,cl } is a three-stage power supply device selected in order of priority from low to high among all three-stage power supply devices. The power value to be regulated corresponding to each three-stage power supply device is the respective maximum supporting power/>The power value to be regulated corresponding to each secondary power supply device is the conservation residual power/>The power value to be regulated corresponding to each stage of power supply device is the conservation 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. However, since the three-stage power supply device is connected to a general user equipment, such user equipment can receive a power failure for a long time, and thus, the influence on the power supply system is not great.
In another alternative embodiment, the relevant power parameters of the load power supply device include various residual powers, conservative notch powers and maximum required power of the load power supply device; wherein the various residual powers comprise conservative residual power, first residual power and second residual power; the conservative notch power is defined as the inverse result of the conservative residual power; the first residual power is equal to the difference value between the current residual power and the conservative residual power, and the second residual power is equal to the difference value between the maximum support power and the current residual power;
And the step of judging and calculating 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 calling-out values of the power supply devices to be called-out and the power supply devices to be called-out according to the judging and calculating results, wherein the step of judging and calculating the power regulation and control comprises the following steps of:
Obtaining various residual powers of all the second power supply devices; wherein the second power supply device is a load power supply device other than the all first power supply devices;
Combining various residual power priorities with the priority list of the load power supply device to determine the priority of all residual power; wherein the various 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 adding each residual power according to the sequence from low priority to high priority of all the residual powers until the addition result is more than or equal to the absolute value of the sum of the conservative notch powers of all the first power supply devices;
and taking the second power supply device corresponding to each residual power which participates in the accumulation calculation as a power supply device to be called, and setting the power calling value of the power supply device to be called as the sum of all types of residual power which the power supply device to be called participates in the accumulation calculation.
In this embodiment, the various types of residual powers that define the embodiments of the present invention include a conservative residual power, a first residual power, and a second residual power; the first residual power is a difference value between the current residual power and the conservative residual power, which can be understood as the residual power which can be output by the load power supply device on the premise of not affecting the current power supply requirement of the corresponding user equipment after the load power supply device outputs the conservative residual power.
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 storage module of the primary power supply device is insufficient, the residual power capacity with low priority in the area can be preferentially allocated to important equipment, so that the reliability of power supply of the important user equipment is ensured.
Corresponding to the embodiment of the energy storage power supply system, the invention also provides a control method embodiment of the energy storage 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. The control method, referring to fig. 5, includes 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 relevant 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 so as to supply energy to the load power supply devices with insufficient power through the alternating current power supply network when detecting that the load power supply devices corresponding to the control module need to call power to the load power supply devices with insufficient power according to judging and calculating results.
In an alternative embodiment, the control method further includes:
And S130, judging and calculating power regulation according to relevant power parameters of all the load power supply devices, and sending a power regulation instruction to a control module of other load power supply devices when detecting that the other load power supply devices need to regulate power to the load power supply devices with insufficient power according to judging and calculating 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 power supply network, and supplying energy to the load power supply devices with insufficient power through the alternating current power supply network.
In an optional implementation manner, the determining and calculating of the power regulation are performed 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 determining and calculating result, the controlling the energy storage module to output power to the ac power supply network so as to supply energy to the load power supply device with insufficient power through the ac power supply network specifically includes:
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;
The reliable power supply of all the first power supply devices is used as a target, the judgment and calculation of power regulation are carried out according to the related power parameters of all the load power supply devices and the priority list of the load power supply devices, and the power calling-out values of the power supply devices to be called out are determined according to the judgment and calculation results; the power supply device to be called is a load power supply device which is used for calling power to the alternating current power supply network;
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 power supply network, so that the alternating current power supply network collects the power calling values of all the power supply devices needing to be called and distributes power to all the first power supply devices.
According to the control method of the energy storage power supply system, 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 mutually communicated, relevant power parameters of the load power supply devices can be received, judgment and calculation of power regulation are conducted according to the relevant power parameters of all the load power supply devices, and when the fact that the load power supply devices corresponding to the control modules need to be powered out of the load power supply devices with insufficient power according to judgment and calculation results, the energy storage module is controlled to output power to the alternating current power supply network so as to supply power to the load power supply devices with insufficient power through the alternating current power supply network. According to the invention, the sharing of the energy storage power of each load power supply device can be realized, on one hand, when the commercial power is cut off for a long time, the user equipment of the load power supply device with insufficient power can be ensured to supply power through the sharing of the energy storage power of each load power supply device, and no additional power generation device is needed to generate power so as 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 architecture can be fully exerted.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Claims (9)
1. The energy storage power supply system is characterized by comprising an alternating current power supply network and N load power supply devices, wherein the input end of the alternating current power supply network is used for being connected with a commercial power network, and the output end of the alternating current power 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; the second conversion input end of the power supply conversion module is connected with the alternating current power supply network, and the output end of the power supply conversion module is 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 relevant power parameters of the load power supply device;
The control module is in communication with the control modules of other load power supply devices and is used for:
receiving related power parameters sent by other control modules of the load power supply device;
judging and calculating power regulation according to relevant 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 judging and calculating results so as to supply energy to the load power supply device with insufficient power through the alternating current power supply network;
The control module stores a priority list of the load power supply device so as to select a corresponding load power supply device to carry out power transmission according to the priority list of the load power supply device; the priority list of the load power supply devices stores the priority sequence of N load power supply devices, the priority of the load power supply devices is determined according to the importance degree of the user equipment connected with the load power supply devices, and the higher the importance degree of the user equipment is, the higher the priority of the load power supply devices is.
2. The energy storage and power supply system of claim 1, wherein the control module is further configured to:
And 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 control modules of other load power supply devices when detecting that other load power supply devices need to regulate power to the load power supply devices with insufficient power according to the judging and calculating 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 power supply network, and supplying energy to the load power supply devices with insufficient power through the alternating current power supply network.
3. The energy storage and 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 is connected to the control module, and a third end is 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 storage and delivery system of claim 1, wherein the control module of any one of said load delivery devices and the control modules of other of said load delivery devices communicate said associated power parameter via a power signal bus.
5. The energy storage power supply system according to claim 1, wherein the determining and calculating of the power regulation are performed 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 regulate power to the load power supply device with insufficient power according to the determining and calculating result, the controlling the energy storage module 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 includes:
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;
The reliable power supply of all the first power supply devices is used as a target, the judgment and calculation of power regulation are carried out according to the related power parameters of all the load power supply devices and the priority list of the load power supply devices, and the power calling-out values of the power supply devices to be called out are determined according to the judgment and calculation results; the power supply device to be called is a load power supply device which is used for calling power to the alternating current power supply network;
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 power supply network, so that the alternating current power supply network collects the power calling values of all the power supply devices needing to be called and distributes power to all the first power supply devices.
6. The energy storage and power supply system according to claim 5, wherein the relevant power parameters of the load power supply device include various residual powers, conservative notch powers and maximum required power of the load power supply device; wherein, the various residual powers comprise conservative residual power, current residual power and maximum supporting power; the conservative notch power is defined as the inverse result of the conservative residual power;
And the step of judging and calculating 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 calling-out values of the power supply devices to be called-out and the power supply devices to be called-out according to the judging and calculating results, wherein the step of judging and calculating the power regulation and control comprises the following steps of:
When the total of the conservative residual power of all the second power supply devices is greater than or equal to the total notch power, sequentially adding the conservative residual power of each second power supply device according to the order of the priority of the load power supply devices from low to high until the accumulation result is greater than or equal to the total notch power to obtain the second power supply devices participating in accumulation calculation, taking the second power supply devices participating in accumulation calculation as power supply devices needing to be called, and setting the power calling value of each power supply device needing to be called 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 the conservative notch powers of all the first power supply devices;
Defining a first residual power sum as a power sum of conservative residual power of all primary power supply devices, conservative residual power of all secondary power supply devices and current residual power of all tertiary power supply devices in all second power supply devices; defining a second residual power sum as a power sum of conservative residual power of all primary power supply devices, current residual power of all secondary power supply devices and current residual power of all tertiary power supply devices in all second power supply devices; defining a third residual power sum as a power sum of conservative residual power of all primary power supply devices in all second power supply devices, current residual power of all secondary power supply devices and maximum supporting power of all tertiary power supply devices; the secondary power supply device is a load power supply device connected with the secondary user equipment, and the tertiary power supply device is a load power supply device connected with the common user equipment; the priority of the three-level power supply device is lower than that of the two-level power supply device, and the priority of the two-level power supply device is lower than that of the one-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-level power supply device and a first accumulation result according to the priority of the load power supply devices from low to high 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 needing to be called, and setting the power value needing to be called of each power supply device needing to be called as the residual power of the corresponding type selected by the power supply devices needing to be called and participating in accumulation calculation; the first accumulation result is obtained by accumulating the conservative residual power of all the primary power supply devices and the conservative residual power of all the secondary power supply devices in all the second power supply devices;
When the first residual power sum is smaller than the total notch power and the second residual power sum is larger than or equal to the total notch power, sequentially adding the current residual power of each secondary power supply device and a second accumulation result according to the order of the priority of the load power supply device from low to high 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 needing to be called out, and setting the power value needing to be called out of each power supply device needing to be called out as the residual power of the corresponding category selected by the power supply device needing to be called out and participating in accumulation calculation; the second accumulation result is obtained by accumulating the current residual power of all 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 smaller than the total notch power and the third remaining power sum is larger than or equal to the total notch power, sequentially adding the maximum supporting power of each three-level power supply device and a third accumulation result according to the order of the priority of the load power supply device from low to high 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 needing to be called, and setting the power value needing to be called of each power supply device needing to be called as the remaining power of the corresponding category selected by the power supply device needing to be called and participating in accumulation calculation; and the third accumulation result is the sum of the conservative residual power of all the primary power supply devices and the current residual power of all the secondary power supply devices in all the second power supply devices.
7. The energy storage and power supply system according to claim 5, wherein the relevant power parameters of the load power supply device include various residual powers, conservative notch powers and maximum required power of the load power supply device; wherein the various residual powers comprise conservative residual power, first residual power and second residual power; the conservative notch power is defined as the inverse result of the conservative residual power; the first residual power is equal to the difference value between the current residual power and the conservative residual power, and the second residual power is equal to the difference value between the maximum support power and the current residual power;
And the step of judging and calculating 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 calling-out values of the power supply devices to be called-out and the power supply devices to be called-out according to the judging and calculating results, wherein the step of judging and calculating the power regulation and control comprises the following steps of:
Obtaining various residual powers of all the second power supply devices; wherein the second power supply device is a load power supply device other than the all first power supply devices;
Combining various residual power priorities with the priority list of the load power supply device to determine the priority of all residual power; wherein the various 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 adding each residual power according to the sequence from low priority to high priority of all the residual powers until the addition result is more than or equal to the absolute value of the sum of the conservative notch powers of all the first power supply devices;
and taking the second power supply device corresponding to each residual power which participates in the accumulation calculation as a power supply device to be called, and setting the power calling value of the power supply device to be called as the sum of all types of residual power which the power supply device to be called participates in the accumulation calculation.
8. A control method based on an energy storage and supply system according to any of claims 1-7, characterized in that the control method is performed by a control module, comprising:
receiving related power parameters sent by other control modules of the load power supply device;
judging and calculating power regulation according to relevant 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 judging and calculating results so as to supply energy to the load power supply device with insufficient power through the alternating current power supply network;
The control module stores a priority list of the load power supply device so as to select a corresponding load power supply device to carry out power transmission according to the priority list of the load power supply device; the priority list of the load power supply devices stores the priority sequence of N load power supply devices, the priority of the load power supply devices is determined according to the importance degree of the user equipment connected with the load power supply devices, and the higher the importance degree of the user equipment is, the higher the priority of the load power supply devices is.
9. The method for controlling an energy storage power supply system according to claim 8, wherein the determining and calculating of the power regulation are performed according to the relevant power parameters of all the load power supply devices, and when it is detected that the load power supply device corresponding to the control module needs to send out power to the load power supply device with insufficient power according to the determining and calculating result, the controlling the energy storage module to output power to the ac power supply network so as to supply energy to the load power supply device with insufficient power through the ac power supply network specifically includes:
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;
The reliable power supply of all the first power supply devices is used as a target, the judgment and calculation of power regulation are carried out according to the related power parameters of all the load power supply devices and the priority list of the load power supply devices, and the power calling-out values of the power supply devices to be called out are determined according to the judgment and calculation results; the power supply device to be called is a load power supply device which is used for calling power to the alternating current power supply network;
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 power supply network, so that the alternating current power supply network collects the power calling values of all the power supply devices needing to be called and distributes power to all the first power supply devices.
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