CN114362243A - Battery charging control method for micro-grid system - Google Patents
Battery charging control method for micro-grid system Download PDFInfo
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- CN114362243A CN114362243A CN202111509638.4A CN202111509638A CN114362243A CN 114362243 A CN114362243 A CN 114362243A CN 202111509638 A CN202111509638 A CN 202111509638A CN 114362243 A CN114362243 A CN 114362243A
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000004146 energy storage Methods 0.000 claims abstract description 55
- 238000010248 power generation Methods 0.000 claims description 16
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 230000000295 complement effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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Abstract
The invention discloses a charging control method for a battery of a microgrid system. The method comprises the following steps: A. when power is supplied to a load, the energy storage converter is set to be in a running mode of a generator set in a constant voltage/constant frequency mode and set conditions are required to be met; B. when the generator set is used for charging the energy storage battery, the generator set is started firstly, the energy storage converter is set to be in a generator set mode, and the generator set is connected with the energy storage converter in a constant power mode to run, and the following conditions are met: the charging power value of the battery is set through the energy storage converter, and meanwhile, power is supplied to the load, but the sum of the load power and the charging power of the energy storage battery is smaller than the rated power of the generator set. After the method is adopted, the energy storage converter is set to be in a generator mode and is in grid-connected operation with the generator set in a constant power mode, so that the energy storage battery can be reliably charged, the charging safety and reliability are ensured, the energy consumption is saved, and the problem that the battery is difficult to charge when the small generator set and the energy storage converter are in grid-connected operation is solved.
Description
Technical Field
The invention relates to a charging method applied to photovoltaic power generation, in particular to a charging control method for a microgrid system battery.
Background
With the increasing maturity of photovoltaic power generation technology, a hybrid energy microgrid integrating distributed power generation such as photovoltaic power generation and energy storage becomes a research hotspot and receives extensive attention, a photovoltaic power generation device and an energy storage device are combined into a single controllable unit, the problem of large-scale access of a distributed power supply can be solved, the advantages of the distributed power supply are fully played, in addition, a diesel generator set is arranged in a power generation system in consideration of higher requirement on power supply reliability, in order to ensure stable power supply under the conditions of no wind and no light for a plurality of continuous days, however, when the load fluctuates, the output torque of a diesel engine and the electromagnetic torque of a generator are mismatched and unbalanced, the rotation speed of the diesel engine fluctuates, the voltage and the frequency are jittered, and the stability of the diesel generator set is ensured by the rotation speed stability of the diesel engine when the load continuously changes, the rotating speed of the diesel engine needs to be adjusted, and effective adjustment of the rotating speed can ensure that the stability of the rotating speed can be ensured by adjusting the oil supply amount of an oil injection pump by changing the rotating speed even if the external load fluctuates or changes greatly in the working process of the diesel engine, so that the optimal solution of the stability of the diesel generator set is that the speed regulator with excellent performance can effectively avoid the phenomenon of 'runaway' when the diesel engine runs at a high speed, and can run very stably in the idling process.
It should be noted that for a 2kW microgrid system, a small generator set is usually equipped for energy saving, so that a diesel engine can be started to directly supply power to a load at any time, and a storage battery can also be charged in a complementary manner.
Disclosure of Invention
The invention aims to provide a micro-grid system battery charging control method which effectively reduces grid-connected charging difficulty and improves charging reliability.
In order to solve the technical problem, the method for controlling the charging of the battery of the microgrid system comprises the following steps:
A. when the system is operated to supply power to a load, the energy storage converter is set to be in a generator mode and an operation mode of a constant voltage/constant frequency mode, and the following conditions are met:
when the load power is smaller than the photovoltaic power generation power, the photovoltaic supplies power to the load and the surplus electric quantity charges the energy storage battery; when the load power is greater than the photovoltaic power generation amount, the photovoltaic power supplies power to the load, and the insufficient power is supplemented by the energy storage battery; and when the photovoltaic power generation and the energy storage battery are not enough to support the load to operate, starting the generator set to operate in a load mode in a constant voltage/constant frequency mode.
B. When the generator set is used for charging the energy storage battery, the generator set is started firstly, the energy storage converter is set to be in a generator mode and is connected with the diesel generator set in a constant power mode to run, and the following conditions are met:
the charging power value of the battery is set through the energy storage converter, and meanwhile, power is supplied to the load, but the sum of the load power and the charging power of the energy storage battery is smaller than the rated power of the generator set.
The generator set is a diesel generator set.
And in the step B, the charging power value of the energy storage battery is determined according to the power of the generator set.
The power of the generator set is 3.3-5.5 kW.
The energy storage converter is a 2kW energy storage converter.
After the method is adopted, the energy storage converter is set to be in a generator mode and is in grid-connected operation with the generator set in a constant power mode, so that the energy storage battery can be reliably charged, the charging safety and reliability are ensured, the energy consumption is saved, and the problem that the battery is difficult to charge when the small generator set and the energy storage converter are in grid-connected operation is solved.
Drawings
Fig. 1 is a schematic block diagram of a microgrid system battery charge control system employed in the present invention.
Detailed Description
The following describes the microgrid system battery charging control system in further detail with reference to the accompanying drawings and the detailed description.
The invention discloses a battery charging control method of a microgrid system, which is realized on the basis of the existing microgrid battery system, as shown in figure 1, the system comprises a 2kW energy storage converter, a photovoltaic assembly and a lithium iron phosphate energy storage battery which are respectively connected with the 2kW energy storage converter, and a 3.3kW diesel generator set which is connected with the 2kW energy storage converter through a grid-connected and off-grid switching device, and of course, the battery charging control method also comprises an electric load connected with the 2kW energy storage converter, and the method comprises the following specific steps:
A. when the system is operated to supply power to a load, the 2kW energy storage converter is set to be in a generator mode and in a constant voltage/constant frequency mode, and the following conditions are met:
when the load power is smaller than the photovoltaic power generation power, the photovoltaic supplies power to the load and the surplus electric quantity charges the energy storage battery; when the load power is greater than the photovoltaic power generation amount, the photovoltaic power supplies power to the load, and the insufficient power is supplemented by the energy storage battery; when the photovoltaic power generation capacity and the energy storage battery are not enough to support the load to operate, the generator set is started to operate in a grid-connected mode with the energy storage converter in a constant voltage/constant frequency mode, and the generator set cannot charge the battery and can only supply power to the load.
B. When the generator set is used for charging the energy storage battery, the generator set is started firstly, the energy storage converter is set to be in a generator mode, and the generator set is connected with the energy storage converter in a constant power mode to run, and the following conditions are met:
because the 3.3kW diesel generating set is selected in the embodiment, at the moment, the charging power value of the battery is set to be less than 700W through the energy storage converter, and power is supplied to the load, but the sum of the load power and the charging power of the energy storage battery is less than the rated power of the generating set by 3.3 kW.
In the method, the 3.3kW diesel generator set is selected for matching the capacity of the 2kW microgrid, the selected standard is matched with the system capacity, the capacity is not fixed, and a small diesel generator set of 3.3-5.5kW can be selected according to the system capacity configuration, so that the problem of difficulty in charging a battery due to the fact that the small diesel generator set does not have a speed regulator and an energy storage converter which are operated in a grid-connected mode is solved on the basis of the model selection.
Claims (6)
1. A method for controlling battery charging of a microgrid system is characterized by comprising the following steps:
A. when the system is operated to supply power to a load, the energy storage converter is set to be in an operation mode of the generator set in a constant voltage/constant frequency mode, and the following conditions are met:
when the load power is smaller than the photovoltaic power generation power, the photovoltaic supplies power to the load and the surplus electric quantity charges the energy storage battery; when the load power is greater than the photovoltaic power generation amount, the photovoltaic power supplies power to the load, and the insufficient power is supplemented by the energy storage battery; when the photovoltaic power generation capacity and the energy storage battery are not enough to support the load to run, starting the generator set, and carrying out grid-connected running with the energy storage converter in a constant voltage/constant frequency mode;
B. when the generator set is used for charging the energy storage battery, the generator set is started firstly, the energy storage converter is set to be in grid-connected operation with the generator set in a constant power mode, and the following conditions are met:
the charging power value of the energy storage battery is set through the energy storage converter, and meanwhile, power is supplied to the load, but the sum of the load power and the charging power of the energy storage battery is smaller than the rated power of the generator set.
2. The microgrid battery charging control method of claim 1, characterized in that: when the photovoltaic power generation capacity and the energy storage battery are not enough to support the load to operate, the generator set can not charge the battery and can only supply power to the load.
3. The microgrid system battery charge control method of claim 1 or 2, characterized in that: the generator set is a diesel generator set.
4. The microgrid system battery charge control method of claim 3, characterized in that: and in the step B, the charging power value of the energy storage battery is determined according to the power of the generator set.
5. The microgrid system battery charge control method of claim 4, characterized in that: the power of the generator set is 3.3-5.5 kW.
6. The microgrid system battery charge control method of claim 5, characterized in that: the energy storage converter is a 2kW energy storage converter.
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| CN202111509638.4A CN114362243A (en) | 2021-12-10 | 2021-12-10 | Battery charging control method for micro-grid system |
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| CN202111509638.4A CN114362243A (en) | 2021-12-10 | 2021-12-10 | Battery charging control method for micro-grid system |
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Citations (7)
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| CN104022528A (en) * | 2014-06-12 | 2014-09-03 | 国家电网公司 | Method for micro-grid system coordinated control based on multi-element composite energy storage |
| CN104333294A (en) * | 2014-11-12 | 2015-02-04 | 英利集团有限公司 | Photovoltaic micro-grid network organization and control method thereof |
| CN108054775A (en) * | 2017-12-15 | 2018-05-18 | 江苏欣云昌电气科技有限公司 | A kind of microgrid control method |
| CN111756065A (en) * | 2020-06-29 | 2020-10-09 | 深圳市富兰瓦时技术有限公司 | Hybrid power supply energy storage system |
| CN111953016A (en) * | 2020-07-27 | 2020-11-17 | 江苏大学 | Mobile multi-energy micro-grid control method and system |
| CN112713613A (en) * | 2020-12-31 | 2021-04-27 | 江苏镇安电力设备有限公司 | Square cabin type modularized micro-grid system |
| CN113725848A (en) * | 2021-07-22 | 2021-11-30 | 西安交通大学 | Off-grid type light storage diesel power supply system and method for avoiding frequent switching of operation modes |
-
2021
- 2021-12-10 CN CN202111509638.4A patent/CN114362243A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104022528A (en) * | 2014-06-12 | 2014-09-03 | 国家电网公司 | Method for micro-grid system coordinated control based on multi-element composite energy storage |
| CN104333294A (en) * | 2014-11-12 | 2015-02-04 | 英利集团有限公司 | Photovoltaic micro-grid network organization and control method thereof |
| CN108054775A (en) * | 2017-12-15 | 2018-05-18 | 江苏欣云昌电气科技有限公司 | A kind of microgrid control method |
| CN111756065A (en) * | 2020-06-29 | 2020-10-09 | 深圳市富兰瓦时技术有限公司 | Hybrid power supply energy storage system |
| CN111953016A (en) * | 2020-07-27 | 2020-11-17 | 江苏大学 | Mobile multi-energy micro-grid control method and system |
| CN112713613A (en) * | 2020-12-31 | 2021-04-27 | 江苏镇安电力设备有限公司 | Square cabin type modularized micro-grid system |
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