CN114759659A - Power supply system and method using energy storage system as uninterruptible power supply - Google Patents
Power supply system and method using energy storage system as uninterruptible power supply Download PDFInfo
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- CN114759659A CN114759659A CN202210270077.5A CN202210270077A CN114759659A CN 114759659 A CN114759659 A CN 114759659A CN 202210270077 A CN202210270077 A CN 202210270077A CN 114759659 A CN114759659 A CN 114759659A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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Abstract
The invention discloses a power supply system and a power supply method using an energy storage system as an uninterruptible power supply. The output end of the first energy storage converter is connected with the input end of the energy storage system and the input end of the second energy storage converter respectively, and the output end of the energy storage system is connected with the input end of the second energy storage converter. The energy storage system is in communication connection with the first energy storage converter and the second energy storage converter respectively. The energy storage system and the first energy storage converter of the external power grid are jointly used as a power supply source of the second energy storage converter, a plurality of charge state intervals are divided by the ratio of the reserved electric quantity to the total electric quantity, the power output by the energy storage system is determined according to the current charge state, and the energy of the energy storage system is regulated and controlled in a multi-stage mode, so that the energy storage system can store enough electric quantity at any time, and the output power of the system to a load is ensured to be stable enough.
Description
Technical Field
The invention relates to the field of energy storage batteries, in particular to a power supply system and a power supply method using an energy storage system as an uninterruptible power supply.
Background
Along with the increasing demand of power consumption of residents, various novel power devices such as intelligent floor heating and intelligent projection are more and more popularized in residents. Daily electricity usage and power at peak hours are increasing for each household. Equipment in domestic factories is also gradually moving into the step of upgrading, and daily electricity consumption and peak power for commercial use are also increasing by replacing old equipment with more intelligent and powerful equipment. The occurrence of this condition further exacerbates the grid load stress. Under the conditions that the thermal power plant is gradually shut down, the power supply is short and the commercial power utilization is limited, an energy storage system and green power generation equipment such as a photovoltaic system, a wind power system or a hydrogen fuel power generation system are used for forming an intelligent micro-grid, the load of the peak value of the power grid can be effectively reduced by regulating and controlling the energy flow, the load pressure of the power grid is reduced, and the effect of peak regulation is achieved.
However, when the existing energy storage system is directly connected to an ac bus for use, it is difficult to constantly ensure that sufficient electricity is used, so that the output power of the system to the load is not stable enough, and the system may be interrupted, thereby causing the risk of shutdown of load equipment and data loss.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the power supply system and the method using the energy storage system as the uninterruptible power supply are provided, so that the energy storage system can store enough electric quantity at any time, and the output power of the system to a load is ensured to be stable enough.
In order to solve the problems, the invention adopts the following scheme:
a power supply system using an energy storage system as an uninterruptible power supply comprises the energy storage system, a first energy storage converter and a second energy storage converter;
the output end of the first energy storage converter is connected with the input end of the energy storage system and the input end of the second energy storage converter respectively, and the output end of the energy storage system is connected with the input end of the second energy storage converter;
the energy storage system is in communication connection with the first energy storage converter and the second energy storage converter respectively;
the input end of the first energy storage converter is used for being externally connected with a power grid, and the output end of the second energy storage converter is used for being externally connected with a load.
In order to solve the above problems, the present invention adopts another scheme as follows:
a power supply method using an energy storage system as an uninterruptible power supply is applied to the power supply system using the energy storage system as the uninterruptible power supply, and comprises the following steps:
S1, calculating the ratio of the reserved electric quantity to the total electric quantity of the energy storage system and taking the ratio as the reserved ratio;
s2, setting more than two state-of-charge intervals according to the reserved ratio, and setting a corresponding power supply strategy for each state-of-charge interval;
and S3, controlling the energy storage system and the power grid to supply power to a second energy storage converter by using the corresponding power supply strategy according to the state-of-charge interval in which the current state of charge of the energy storage system is.
In conclusion, the beneficial effects of the invention are as follows: the energy storage system and a first energy storage converter of an external power grid are jointly used as a power supply source of a second energy storage converter, a plurality of charge state intervals are divided according to the ratio of reserved electric quantity to total electric quantity, the power output by the energy storage system is determined according to the current charge state, and the energy of the energy storage system is regulated and controlled in multiple stages, so that the energy storage system can store enough electric quantity at any time, and the output power of the system to a load is ensured to be stable enough.
Drawings
Fig. 1 is a system block diagram of a power supply system using an energy storage system as an uninterruptible power supply according to an embodiment of the invention;
Fig. 2 is a schematic step diagram of a power supply method using an energy storage system as an uninterruptible power supply according to an embodiment of the invention.
Description of the reference symbols:
1. a power grid; 2. an energy storage system; 3. a first energy storage converter; 4. a second energy storage converter; 5. and (4) loading.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Referring to fig. 1, a power supply system using an energy storage system as an uninterruptible power supply includes an energy storage system 2, a first energy storage converter 3, and a second energy storage converter 4;
the output end of the first energy storage converter 3 is respectively connected with the input end of the energy storage system 2 and the input end of the second energy storage converter 4, and the output end of the energy storage system 2 is connected with the input end of the second energy storage converter 4;
the energy storage system 2 is in communication connection with the first energy storage converter 3 and the second energy storage converter 4 respectively;
the input end of the first energy storage converter 3 is used for being externally connected with a power grid 1, and the output end of the second energy storage converter 4 is used for being externally connected with a load 5.
From the above description, the beneficial effects of the present invention are: the energy storage system 2 and the first energy storage converter 3 of the external power grid 1 are jointly used as a power supply source of the second energy storage converter 4, the energy storage system 2 is powered through the first energy storage converter 3, so that enough electric quantity exists in the energy storage system 2 at any time, and the output power of the system to the load 5 is guaranteed to be stable enough.
Referring to fig. 2, a power supply method using an energy storage system as an uninterruptible power supply is applied to the power supply system using the energy storage system 2 as the uninterruptible power supply, and includes the following steps:
s1, calculating the ratio of the reserved electric quantity to the total electric quantity of the energy storage system 2 and taking the ratio as the reserved ratio;
s2, setting more than two state-of-charge intervals according to the reserved ratio, and setting a corresponding power supply strategy for each state-of-charge interval;
and S3, controlling the energy storage system 2 and the power grid 1 to supply power to a second energy storage converter 4 by using the corresponding power supply strategy according to the state of charge interval of the current state of charge of the energy storage system 2.
As can be seen from the above description, the beneficial effects of the present invention are: the energy storage system 2 and the first energy storage converter 3 of the external power grid 1 are jointly used as a power supply source of the second energy storage converter 4, a plurality of charge state intervals are divided by the ratio of reserved electric quantity to total electric quantity, the power output by the energy storage system 2 is determined according to the current charge state, and the energy of the energy storage system 2 is regulated in a multi-stage mode, so that the energy storage system 2 can store enough electric quantity at any time, and the output power of the system to a load 5 is guaranteed to be stable enough.
Further, step S1 is preceded by:
and S0, calculating the product of the full load power of the load 5 and the preset working time length of the load 5 required to be kept when the power grid 1 is powered off, and taking the product as the reserved electric quantity.
As can be seen from the above description, the reserved electric quantity is obtained by combining the full load power of the load 5 and the preset working time that the load 5 needs to be kept when the power grid 1 is powered off, that is, the electric quantity of the energy storage system 2 is ensured to be always kept at the electric quantity capable of meeting the most basic power demand of the load 5, so that the load 5 is given with sufficient stable output power.
Further, the setting of a plurality of soc intervals according to the reserved ratio specifically includes:
setting a first state of charge interval to be a state of charge which is greater than the sum of the reserved ratio and the first increment;
setting a second state of charge interval to be less than or equal to the sum of the reserved ratio plus the first increment and greater than the sum of the reserved ratio plus the second increment, wherein the first increment is greater than the second increment;
setting a third state of charge interval to be a state of charge which is greater than the reserved ratio and less than or equal to the sum of the reserved ratio and the second increment;
and setting the fourth state of charge interval to be the state of charge smaller than or equal to the reserved ratio.
It can be known from the above description that the reserved ratio is mainly used, and the first increment, the second increment and the reserved ratio are combined to set the first state of charge interval, the second state of charge interval, the third state of charge interval and the fourth state of charge interval, so as to ensure that enough fault-tolerant space is reserved for the electric energy margin of the energy storage system 2, and thus the power supply output of the system is more stable.
Further, the setting of the corresponding power supply strategy for each state of charge interval specifically includes:
s21, if the current state of charge is in the first state of charge interval, controlling the energy storage system 2 to output power accounting for the first percentage value of the required power to the second energy storage converter 4, and providing the power of the remaining percentage by the power grid 1;
s22, if the current state of charge is in the second state of charge interval, controlling the energy storage system 2 to output power, accounting for the second percentage value of the required power, to the second energy storage converter 4, and providing the power of the remaining percentage by the power grid 1;
s23, if the current state of charge is in the third state of charge interval, the power is output to the second energy storage converter 4 by the power grid 1 alone;
and S24, if the current state of charge is in the fourth state of charge interval, outputting power to the second energy storage converter 4 by the power grid 1, and simultaneously supplying power to the energy storage system 2 by the rest output power until the real-time state of charge of the energy storage system 2 is in the third state of charge interval.
From the above description, it can be known that, corresponding to each state of charge interval, a corresponding power supply strategy is implemented, so that the power output of the power grid 1 via the first energy storage converter 3 is closely matched with the power output of the energy storage system 2, thereby realizing accurate control of the electric quantity of the energy storage system 2 and ensuring that the system has reliable and stable power supply output.
Further, the step S23 is followed by:
and judging whether the full output power of the first energy storage converter 3 is smaller than the required power of the second energy storage converter 4, if so, controlling the energy storage system 2 to output power to the second energy storage converter 4 so as to compensate the difference between the full output power of the first energy storage converter 3 and the required power of the second energy storage converter 4.
From the above description, when the amount of electricity required by the currently connected load 5 has exceeded the full output power of the first energy storage converter 3, that is, during a power utilization peak period, the energy storage system 2 makes up the excess to satisfy the power supply of the load 5 as a first place, so as to reduce the risk of equipment shutdown and data loss of the load 5.
Further, the first incremental value is 20%, the second incremental value is 10%, the first percentage value is 80%, and the second percentage value is 50%.
From the above description, the first increment is 20% and the second increment is 10%, and a fault tolerance is set aside on the basis of the reserved electric quantity to ensure that the electric quantity of the system meets the actual basic power supply requirement. When the energy storage system 2 is charged, a higher percentage of power output is provided to the load 5, otherwise the output is reduced to maintain the charge of the energy storage system 2.
Further, the step S3 is followed by:
s4, charging the energy storage system 2 through the first energy storage converter 3 during the valley period.
From the above description, it can be known that the energy storage system 2 is charged by the first energy storage converter 3 during the valley electricity period, so that the purposes of peak clipping, valley filling and price difference earning can be achieved.
Further, step S1 is preceded by:
and setting the first energy storage converter 3 to be in a constant power mode, and setting the second energy storage converter 4 to be in a constant voltage output mode.
As can be seen from the above description, the first energy storage converter 3 is set to be in the constant power mode, and the second energy storage converter 4 is set to be in the constant voltage output mode, which is equivalent to the off-grid operation, and the output power can be adjusted according to the actual demand of the load 5.
Further, the step S3 is followed by:
and S5, controlling the energy storage system 2 to absorb the input electric energy of the first energy storage converter 3 when the load 5 is suddenly interrupted.
As can be seen from the above description, the energy storage system 2 can absorb the input power of the first energy storage converter 3, so as to prevent the system from being unable to absorb the input power when the load 5 is interrupted.
The power supply system and method using the energy storage system as the uninterruptible power supply can be applied to the scene of power supply of the load 5, and are explained by specific embodiments as follows:
heretofore, it is worth explaining that there are three problems with the existing energy storage architecture:
firstly, when the existing energy storage framework is set to carry out peak clipping and valley filling in different time intervals, if the load is suddenly powered off, the energy storage power cannot be recovered and can flow back to the power grid;
secondly, when the existing energy storage architecture is used at a power grid fault terminal and needs to perform grid-connected and off-grid switching, uninterrupted switching cannot be performed, so that load equipment is shut down, and data are lost;
thirdly, the existing energy storage framework cannot guarantee enough electric quantity at all times, and the condition of insufficient power supply output is easy to occur after the existing energy storage framework is separated from a power grid, so that load equipment is shut down, and data is lost.
The power supply system and method of the present embodiment are used to solve the above three problems.
Referring to fig. 1, a first embodiment of the present invention is:
A power supply system using an energy storage system as an uninterruptible power supply is shown in fig. 1 and comprises an energy storage system 2, a first energy storage converter 3 and a second energy storage converter 4. The output end of the first energy storage converter 3 is connected with the input end of the energy storage system 2 and the input end of the second energy storage converter 4 respectively, and the output end of the energy storage system 2 is connected with the input end of the second energy storage converter 4. The energy storage system 2 is in communication connection with a first energy storage converter 3 and a second energy storage converter 4 respectively. The input end of the first energy storage converter 3 is used for being externally connected with the power grid 1, and the output end of the second energy storage converter 4 is used for being externally connected with the load 5.
In this embodiment, the reason why the power supply system can solve the above three problems is that:
firstly, in this embodiment, the power output of the grid 1 is not directly output to the load 5, but flows into the second energy storage converter 4 through the first energy storage converter 3 and the power output of the energy storage system 2, and then is output to the load 5 by the second energy storage converter 4. When the load 5 is suddenly interrupted, the second energy storage converter 4 can maintain the voltage on the side of the load 5 by utilizing the constant voltage source characteristic of the second energy storage converter, the power is automatically reduced, the off-grid operation is equivalent to, the power output by the second energy storage converter 4 can not flow back to the power grid 1, meanwhile, the energy storage system 2 can absorb the electric energy, the excess electricity input by the first energy storage converter 3 can be absorbed by the stored energy, and the condition that the energy can not be absorbed can not occur.
Then, in this embodiment, when the grid 1 is interrupted by a fault, there is no power output from the first energy storing converter 3. However, the battery system of the energy storage system 2 can always keep electric energy output, and originally, the condition that the power grid 1 and the energy storage system 2 supply power together can be changed into the condition that the energy storage system 2 supplies power alone, so that the output power to the load 5 is not interrupted;
finally, the output end of the first energy storage converter 3 is connected with the input end of the energy storage system 2, so that the energy storage system 2 can be charged in real time, enough electric quantity in the energy storage system 2 is ensured, the energy storage system 2 supplies power independently after the energy storage system is separated from the power grid 1, and the output power of the load 5 is ensured not to be interrupted.
Referring to fig. 2, a second embodiment of the present invention is:
a power supply method using an energy storage system as an uninterruptible power supply, which is applied to a power supply system using an energy storage system as an uninterruptible power supply in an embodiment one, as shown in fig. 2, includes the following steps:
and S0, calculating the product of the full load power of the load 5 and the preset working time length of the load 5 required to be kept when the power grid 1 is powered off, and taking the product as the reserved electric quantity.
In this embodiment, assuming that the full load power of the load 5 is 600kW, if the load 5 needs to be guaranteed to have a 30-minute service time when the external power grid 1 is powered off, the battery system needs to reserve at least 0.5h × 600kW, which is 300kWh of electricity. The preset working time required to be kept by the load 5 when the power grid 1 is powered off can be set according to actual use requirements.
In this embodiment, the first energy storage converter 3 is set to be in a constant power mode, and the energy storage system 2 adjusts the power output of the first energy storage converter and the power output of the second energy storage converter 4 through the power output of the first energy storage converter and the power output of the second energy storage converter, so as to ensure that the power supply system always leaves enough power to the load 5. The second energy storage converter 4 is in a constant voltage output mode, and can adjust the output of the second energy storage converter according to the power actually required by the load 5.
S1, calculating the ratio of the reserved electric quantity to the total electric quantity of the energy storage system 2 and taking the ratio as the reserved ratio;
in the present embodiment, taking the above assumed content as an example, if the total charge of the energy storage system 2 is 618kWh, the reserved ratio is 300kWh/618kWh, i.e. approximately equals to 50%.
S2, setting more than two state-of-charge intervals according to the reserved ratio, and setting a corresponding power supply strategy for each state-of-charge interval;
in this embodiment, setting a plurality of state of charge intervals according to the reserved ratio specifically includes:
setting the first state of charge interval as a state of charge which is greater than the sum of the reserved ratio and the first increment;
setting a second state of charge interval to be less than or equal to the sum of the reserved ratio and the first increment value and greater than the sum of the reserved ratio and the second increment value, wherein the first increment value is greater than the second increment value;
Setting a third state of charge interval as a state of charge which is greater than the reserved ratio and less than or equal to the sum of the reserved ratio and the second increment;
and setting the fourth state of charge interval to be the state of charge smaller than or equal to the reserved ratio.
In this embodiment, taking the reserved ratio as 50%, the first increment as 20% and the second increment as 10% as examples, the first state of charge interval is (70%, 100%), the second state of charge interval is (60%, 70%), the third state of charge interval is (50%, 60%), and the fourth state of charge interval is (0%, 50%).
Interval setting is carried out according to actual demand, for example, when the load power utilization time period of a client is concentrated, wider threshold values can be set in the first interval and the second interval, and the fact that the battery system has the electric quantity to be used in the concentrated power utilization state is guaranteed. If the loads are dispersed, the four intervals can be set to be even, the power pulled by the power grid side is ensured not to be subjected to sudden increase and sudden decrease, and the power pulled by the first energy storage alternating current device from the power grid side is enabled to be in a moderate state all the time.
The power supply strategies corresponding to the four state of charge intervals are as follows:
s21, if the current state of charge is in a first state of charge interval, controlling the energy storage system 2 to output power accounting for the first percentage value of the required power to the second energy storage converter 4, and providing the power of the remaining percentage by the power grid 1;
S22, if the current state of charge is in a second state of charge interval, controlling the energy storage system 2 to output power, accounting for the second percentage value of the required power, to the second energy storage converter 4, and providing the power of the remaining percentage by the power grid 1;
s23, if the current state of charge is in a third state of charge interval, the power grid 1 outputs power to the second energy storage converter 4 independently;
the power grid 1 outputs power to the second energy storage converter 4 independently, whether the full output power of the first energy storage converter 3 is smaller than the required power of the second energy storage converter 4 needs to be judged, if yes, the energy storage system 2 is controlled to output power to the second energy storage converter 4, and the difference between the full output power of the first energy storage converter 3 and the required power of the second energy storage converter 4 is complemented.
And S24, if the current state of charge is in a fourth state of charge interval, outputting power to the second energy storage converter 4 by the power grid 1, and simultaneously supplying power to the energy storage system 2 by the rest output power until the real-time state of charge of the energy storage system 2 is in a third state of charge interval.
In this embodiment, the first percentage value is 80% and the second percentage value is 50%, in other equivalent embodiments, the first percentage value and the second percentage value may also be determined according to the actual reserved electric quantity and the reserved value, so as to ensure that the energy storage system 2 has sufficient electric quantity.
And S3, controlling the energy storage system 2 and the power grid 1 to supply power to the second energy storage converter 4 by using a corresponding power supply strategy according to the state of charge interval of the current state of charge of the energy storage system 2.
In the embodiment, the state of charge interval of the power supply system and the power supply strategy are both executed by the control module of the energy storage system 2, which adjusts the outputs of the first energy storage converter 3 and the second energy storage converter 4 through signal communication.
And S4, charging the energy storage system 2 through the first energy storage converter 3 in the valley period.
In the present embodiment, since the electricity price is low in the off-peak period, the energy storage system 2 is charged by using the period, so as to achieve the purpose of earning a price difference.
S5, controlling the energy storage system 2 to absorb the input electric energy of the first energy storage converter 3 when the load 5 is suddenly interrupted.
In summary, the present invention discloses a power supply system and method using an energy storage system as an uninterruptible power supply, wherein the energy storage system and a first energy storage converter of an external power network are used as a power supply source of a second energy storage converter, a plurality of charge state intervals are divided by reserving a ratio of an electric quantity to a total electric quantity, a power output by the energy storage system is determined according to a current charge state, and energy of the energy storage system is regulated in multiple stages, so that the energy storage system stores enough electric quantity at any time, and it is ensured that the output power of the system to a load is stable enough.
The above description is only an embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent modifications made by the present invention and the contents of the accompanying drawings, which are directly or indirectly applied to the related technical fields, are included in the scope of the present invention.
Claims (10)
1. A power supply system using an energy storage system as an uninterruptible power supply is characterized by comprising an energy storage system, a first energy storage converter and a second energy storage converter;
the output end of the first energy storage converter is connected with the input end of the energy storage system and the input end of the second energy storage converter respectively, and the output end of the energy storage system is connected with the input end of the second energy storage converter;
the energy storage system is in communication connection with the first energy storage converter and the second energy storage converter respectively;
the input end of the first energy storage converter is used for being externally connected with a power grid, and the output end of the second energy storage converter is used for being externally connected with a load.
2. A power supply method using an energy storage system as an uninterruptible power supply, which is applied to the power supply system using the energy storage system as the uninterruptible power supply described in claim 1, and which includes the following steps:
S1, calculating the ratio of the reserved electric quantity to the total electric quantity of the energy storage system and taking the ratio as the reserved ratio;
s2, setting more than two state-of-charge intervals according to the reserved ratio, and setting a corresponding power supply strategy for each state-of-charge interval;
and S3, controlling the energy storage system and the power grid to supply power to a second energy storage converter by using the corresponding power supply strategy according to the state-of-charge interval in which the current state of charge of the energy storage system is.
3. A method according to claim 2, wherein the step S1 is preceded by the steps of:
and S0, calculating the product of the full load power of the load and the preset working time length of the load required to be kept when the power grid is cut off, and taking the product as the reserved electric quantity.
4. A power supply method using an energy storage system as an uninterruptible power supply according to claim 2, wherein the setting of more than two state of charge intervals according to the reserved ratio specifically includes:
setting a first state of charge interval to be a state of charge which is greater than the sum of the reserved ratio and the first increment;
setting a second state of charge interval to be less than or equal to the sum of the reserved ratio and the first increment and greater than the sum of the reserved ratio and the second increment, wherein the first increment is greater than the second increment;
Setting a third state of charge interval to be greater than the reserved ratio and less than or equal to the state of charge of the sum of the reserved ratio and the second incremental value;
and setting the fourth state of charge interval to be the state of charge smaller than or equal to the reserved ratio.
5. The power supply method using the energy storage system as the uninterruptible power supply according to claim 4, wherein the setting of the corresponding power supply strategy for each of the state of charge intervals is specifically:
s21, if the current state of charge is in the first state of charge interval, controlling the energy storage system to output power, accounting for the first percentage value of the required power, to the second energy storage converter, and providing power with the remaining percentage by a power grid;
s22, if the current state of charge is in the second state of charge interval, controlling the energy storage system to output power, accounting for the second percentage value of the required power, to the second energy storage converter, and providing the power with the remaining percentage by the power grid;
s23, if the current state of charge is in the third state of charge interval, the power is output to the second energy storage converter by the power grid independently;
And S24, if the current state of charge is in the fourth state of charge interval, outputting power to the second energy storage converter by a power grid, and simultaneously supplying power to the energy storage system by the rest output power until the real-time state of charge of the energy storage system is in the third state of charge interval.
6. The method according to claim 5, further comprising, after the step S23:
and judging whether the full output power of the first energy storage converter is smaller than the required power of the second energy storage converter, if so, controlling the output power of the energy storage system to the second energy storage converter to compensate the difference between the full output power of the first energy storage converter and the required power of the second energy storage converter.
7. A method as claimed in claim 5, wherein the first incremental value is 20%, the second incremental value is 10%, the first percentage value is 80%, and the second percentage value is 50%.
8. A method according to claim 2, wherein the step S3 is further followed by:
And S4, charging the energy storage system through the first energy storage converter in a valley electricity period.
9. A method according to claim 2, wherein the step S1 is preceded by the steps of:
and setting the first energy storage converter to be in a constant power mode, and setting the second energy storage converter to be in a constant voltage output mode.
10. A method according to claim 9, wherein the step S3 is further followed by:
and S5, controlling the energy storage system to absorb the input electric energy on the first energy storage converter when the load is suddenly interrupted.
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| WO2017143878A1 (en) * | 2016-02-25 | 2017-08-31 | 广州广电运通金融电子股份有限公司 | Method and system for intelligent uninterruptible power supply for atm device |
| US20190348839A1 (en) * | 2016-06-17 | 2019-11-14 | Upside Energy Ltd. | A system and method for controlling devices in a power distribution network |
| CN110571915A (en) * | 2019-09-19 | 2019-12-13 | 浙江工业大学 | An intelligent energy storage power supply vehicle uninterruptible power supply system device and control method thereof |
| US10840723B1 (en) * | 2019-12-13 | 2020-11-17 | Capital One Services, Llc | Dynamic management of multiple device power consumption |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017143878A1 (en) * | 2016-02-25 | 2017-08-31 | 广州广电运通金融电子股份有限公司 | Method and system for intelligent uninterruptible power supply for atm device |
| US20190348839A1 (en) * | 2016-06-17 | 2019-11-14 | Upside Energy Ltd. | A system and method for controlling devices in a power distribution network |
| CN110571915A (en) * | 2019-09-19 | 2019-12-13 | 浙江工业大学 | An intelligent energy storage power supply vehicle uninterruptible power supply system device and control method thereof |
| US10840723B1 (en) * | 2019-12-13 | 2020-11-17 | Capital One Services, Llc | Dynamic management of multiple device power consumption |
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