CN107508304B - Partition control method of battery energy storage system - Google Patents
Partition control method of battery energy storage system Download PDFInfo
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- CN107508304B CN107508304B CN201710756802.9A CN201710756802A CN107508304B CN 107508304 B CN107508304 B CN 107508304B CN 201710756802 A CN201710756802 A CN 201710756802A CN 107508304 B CN107508304 B CN 107508304B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
Abstract
The invention discloses a battery energy storage system partitionThe control method comprises the steps that four SOC nodes are set, and meanwhile, charging and discharging multiplying power partition control nodes are set, so that under the normal working condition of an external environment, if the SOC of the battery energy storage system is in an energy free carrying area, the charging and discharging state is freely controlled according to the requirement of the external environment, and if the SOC is in an emergency charging special area, the charging and discharging multiplying power C is adoptedmaxCarrying out emergency charging, allowing charging only, and if the battery is in an emergency discharging special area, charging and discharging multiplying power CmaxAn emergency discharge is performed and only the discharge is allowed. When the external environment is in an emergency working condition, the battery energy storage system is connected with the battery energy storage system through a connection terminal CemgAnd CminTimely initiating emergency power control for upper and lower limits to be at SOCminAnd SOCmaxThe battery energy storage system preferentially provides an emergency power control function of quick charging or quick discharging when the external environment has high-power disturbance. The invention realizes the fine management of the battery energy storage system, avoids frequent charge-discharge switching, improves the utilization rate of equipment and has better economic benefit.
Description
Technical Field
The invention relates to the technical field of micro-grid power distribution, in particular to a partition control method of a battery energy storage system.
Background
The existing research and practice shows that the micro-grid is the most effective way to exert the efficiency of the distributed power generation and supply system. The energy storage system is an important component of the micro-grid system and can smooth the power output of intermittent renewable energy sources such as wind power, photovoltaic and the like; energy can be carried along with the output conditions of the load and the micro power supply, so that the utilization rate of renewable energy sources is obviously improved; the method can perform emergency power control under the condition of large disturbance of the micro-grid system, and plays a very important role in stable operation and control of the micro-grid system.
In recent years, a large-capacity battery energy storage system is increasingly applied to the power industry, and in a large-capacity centralized battery energy storage power station, the energy storage system is generally configured completely and independently according to an energy type and a power type, wherein the energy type is used for realizing peak clipping and valley filling, and the power type is used for realizing functions of power grid frequency modulation, power emergency control and the like. In a micro-grid system containing various distributed power sources, an energy storage system is independently configured according to an energy type and a power type according to system requirements, the energy storage system mainly carries energy and improves the permeability of renewable energy, and the power storage system mainly provides the rotation capacity of the system for standby and is used for emergency power control under the condition of large disturbance of the micro-grid system. However, the energy type and power type battery energy storage systems are configured at the same time, so that the equipment investment of the power system is increased, and the power type battery energy storage system is low in utilization rate and does not have good economic benefit.
At present, a control method for integrating two functions of energy handling and emergency power control into a set of energy storage system is provided, for example, the invention has the patent application number of 201310059177.4, and the invention name is: a control method for a battery energy storage system that is both energy and power, the application discloses: according to different state of charge values, on the basis of control nodes SOCmin and SOCmax of the existing battery energy storage system, two control nodes SOCbrown and SOCup are additionally arranged to divide the battery energy storage system into 3 operable areas, so that the optimal control of the battery energy storage system under different states of charge under different external operating environments is realized. However, the technology does not consider the factor of charge and discharge rate, and cannot manage the battery energy storage system more finely. The charging and discharging switching is required to be frequently carried out, the service life of the battery is effectively prolonged, and the utilization rate of the battery energy storage system is ensured.
On the basis of the background technology, the invention creates a partition control method of the battery energy storage system, which further provides a charging and discharging multiplying power partition control strategy on the basis of the state of charge partition, so that the battery energy storage system is finely managed, and the service life of the battery energy storage system is prolonged.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a partition control method of a battery energy storage system, so that frequent charge and discharge switching is avoided, and the battery energy storage system is finely managed, thereby overcoming the defects of the existing partition control method of the battery energy storage system.
In order to solve the technical problem, the invention provides a subarea control method of a battery energy storage system, which comprises a charge state subarea control method and a charge-discharge multiplying power subarea control method under the synergistic action,
the partitioning steps of the charge state partitioning control method are as follows: setting the SOC of the battery energy storage system into four key nodes SOCmin、SOCdown、SOCupAnd SOCmaxWherein SOC isminAnd SOCmaxLower limit and upper limit of limit operation interval for preventing over charge and discharge of battery, SOCdownAnd SOCupRespectively realizing the lower limit and the upper limit of a normal operation interval for carrying battery energy, wherein SOCmin-SOCdown is an emergency charging special area, SOCdown-SOCup is an energy free carrying area, and SOCup-SOCmax is an emergency discharging special area;
the partition step of the charge and discharge multiplying power partition control method is as follows: setting the charge-discharge multiplying power of the battery energy storage system to be minimum charge-discharge multiplying power CminMaximum charge-discharge multiplying power CmaxAnd emergency charge-discharge multiplying power Cemg；
The synergistic effect method of the charge state zone control method and the charge and discharge multiplying power zone control method comprises the following working conditions:
under normal working conditions, when the SOC is in the SOCminAnd SOCdownIn between, according to the charge-discharge multiplying power CmaxPerforming emergency charging when SOC is in SOCupAnd SOCmaxIn between, according to the charge-discharge multiplying power CmaxEmergency discharging is carried out, and the SOC is quickly returned to the SOCbrown-SOCup interval; when the SOC is at SOCdownAnd SOCupIn between, according to the current charge-discharge state, with the charge-discharge rate CmaxAnd CminMaintaining the ordered charging and discharging of the battery for the upper and lower limits;
under the emergency working condition, when the external environment of the battery energy storage system is in an overload state, the battery energy storage system adopts CemgAnd CminTimely initiating emergency power control for upper and lower limits to be at SOCminAnd SOCmaxDischarge between the electrodes; when the external environment of the battery energy storage system is in a light load state, the battery energy storage system is in a state of CemgAnd CminTimely initiating emergency power control for upper and lower limits to be at SOCminAnd SOCmaxAnd (4) charging.
As an improvement of the present invention, the partition control method of the battery energy storage system further includes:
when the external environment has large power disturbance, the subarea control method preferentially executes the emergency power control step of quick charge or quick discharge under the emergency working condition;
when the external environment normally operates, when the SOC of the battery energy storage system is in an energy free carrying area, the charging and discharging state is freely controlled according to the requirements of the external environment, when the SOC of the battery energy storage system is in an emergency charging special area, only charging is allowed, and when the SOC of the battery energy storage system is in an emergency discharging special area, only discharging is allowed.
Further improvement, the external environment is a micro-grid, a large grid or a battery energy storage power station.
In a further improvement, the microgrid comprises the battery energy storage system, a diesel power generation system, a biomass power generation system, an intermittent energy power generation system, an alternating current bus, a load and a microgrid central controller,
the battery energy storage system, the diesel power generation system, the biomass power generation system and the intermittent energy power generation system are respectively connected with the alternating current bus, the alternating current bus is further connected with the load, the battery energy storage system, the diesel power generation system, the biomass power generation system and the intermittent energy power generation system provide electric energy for the load, and the micro-grid central controller is used for managing and optimally scheduling the energy of the micro-grid system.
In a further refinement, the intermittent energy source power generation system comprises a photovoltaic power generation system and a wind power generation system.
After adopting such design, the invention has at least the following advantages:
1. the invention further provides a charging and discharging multiplying power zone control strategy on the basis of the state of charge zone to realize the fine management of the battery energy storage system, realizes the optimal control of the battery energy storage system under different states of charge in different external operating environments, can integrate two functions of energy transportation and power emergency control into one set of energy storage system, and has the advantages of simple, flexible, fine and accurate control method, easy realization and contribution to popularization.
2. According to the invention, through the arrangement of the state-of-charge partition and the charge-discharge multiplying power partition, on one hand, the battery energy storage system is ensured to have the capability of power emergency control at any moment, on the other hand, the ordered charge-discharge of the battery energy storage system is ensured, the deep charge and deep discharge are prevented, and the service life of the battery energy storage system is prolonged.
Drawings
The foregoing is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and the detailed description.
Fig. 1 is a schematic structural diagram of a microgrid system including a plurality of distributed power sources to which the present invention is applied.
Fig. 2 is a schematic structural diagram of a partition control method of the battery energy storage system according to the invention.
Detailed Description
The partition control method of the battery energy storage system can be applied to a micro-grid, a large-grid or a battery energy storage power station which comprises a set of battery energy storage systems with both energy type and power type, and is used for controlling the battery energy storage system, so that the battery energy storage system has the functions of energy transportation and emergency power control. The following description is given by way of example of a microgrid system.
Referring to fig. 1, a microgrid system containing various distributed power sources is shown, and comprises a diesel power generation system 1, a battery energy storage system 2, a biomass power generation system 3, a photovoltaic power generation system 4, a wind power generation system 5, an alternating current bus 6, a load 8 and a microgrid central control unit 7. The diesel power generation system 1, the battery energy storage system 2, the biomass power generation system 3, the photovoltaic power generation system 4 and the wind power generation system 5 are respectively connected with an alternating current bus 6, the alternating current bus 6 is further connected with a load 8, each power generation system provides power supply for the load 8, and the microgrid central controller 7 manages and optimally schedules the energy of the microgrid system.
The method has the advantages that the power supply of the load 8 is stable and reliable, meanwhile, the permeability of renewable energy sources is improved as much as possible, the consumption of fossil energy sources is reduced, the emission is reduced, and the economical efficiency of a system is ensured, so that the method is an important purpose for the practice of microgrid engineering. When the micro-grid system normally operates, a diesel generator set is selected as a main power supply, the voltage and the frequency of a power grid are established, meanwhile, rotary power is provided for the system for standby, instantaneous fluctuation of power of a load and an intermittent power source (a photovoltaic power generation system and a wind power generation system) is stabilized, and the micro-grid system has short-time overload and light-load capacity. When the load power demand is larger than the output of intermittent energy, the photovoltaic power generation system and the wind power generation system operate in a maximum power tracking mode, so that the utilization rate of the intermittent new energy is improved; and when the relative load demand of the intermittent new energy is surplus, the surplus part preferentially charges the battery energy storage system, if the surplus part still exists, the battery energy storage system needs to operate in a limited power mode, and even part of the wind power and photovoltaic generator sets are cut off. The biomass power generation system has relatively slow power response characteristic, mainly bears part of basic power supply load, and when the intermittent new energy is abundant, the biomass power generation system operates at a lower load rate level as much as possible and even stops the biomass power generation system, and when the intermittent new energy is insufficient, the output level is improved as much as possible to reduce the consumption of diesel oil.
According to the battery energy storage system, through control of a control strategy, on one hand, energy transportation of intermittent new energy sources such as wind power, photovoltaic and the like can be realized, so that the energy transportation can follow load requirements as much as possible, and the utilization rate of the new energy sources is improved; on the other hand, in the case of large system disturbance, emergency power support is provided to assist in maintaining the system stable.
Referring to fig. 2, the partition control method of the battery energy storage system of the embodiment includes:
first, four state of charge (SOC) nodes are set: SOCmin、SOCdown、SOCupAnd SOCmaxWherein SOC ismaxAnd SOCminThe upper limit and the lower limit of the limit operation interval and the SOC are respectively set for preventing the over charge and the over discharge of the batteryupAnd SOCdownThe upper limit and the lower limit of the normal operation interval are respectively set for realizing the energy transportation of the battery; meanwhile, in order to further finely manage the battery energy storage system, a charging and discharging multiplying power partition control strategy is provided, and C is recordedminAt minimum charge-discharge rate, CmaxMaximum charge-discharge rate, CemgThe emergency charge and discharge multiplying power.
Under normal working conditions, when the SOC is in the SOCminAnd SOCdownAnd SOCupAnd SOCmaxIn between, according to multiplying power C shown by line segments EF and HG respectivelymaxCharging and discharging to quickly return to a normal operation interval shown by BCGF; when the SOC is at SOCdownAnd SOCupIn between, according to the current charge-discharge state, with CmaxAnd CminThe ordered charging and discharging of the battery is maintained for the upper and lower limits, so that the optimized transportation of energy is realized, and the service life of the battery is prolonged.
Under the emergency working condition, the battery energy storage system needs to be capable of providing charge and discharge power at any time to deal with the short-time shortage of the power of the external environment system in real time, and the limit value of the charge and discharge multiplying power is increased to CemgThereby enabling it to provide emergency power support during the operating interval shown at ADJI. The method specifically comprises the following steps: when the micro-grid is in an overload state, the battery energy storage system is connected with the power grid through a connection line CemgAnd CminTimely initiating emergency power control for upper and lower limits to be at SOCminAnd SOCmaxBetween them putElectricity; when the micro-grid is in a light load state, the battery energy storage system is connected with the power grid through a connection capacitor CemgAnd CminTimely initiating emergency power control for upper and lower limits to be at SOCminAnd SOCmaxAnd the micro-grid is charged so as to cooperate with a main power supply to maintain the safe and stable operation of the micro-grid.
Furthermore, when the external environment has large power disturbance, the battery energy storage system can always provide an emergency power control function of quick charge or quick discharge preferentially; when the external environment normally operates, when the battery energy storage system is in an energy free carrying area, the charging and discharging state is freely controlled according to the requirements of the external environment, only charging is allowed when the battery energy storage system is in an emergency charging special area, and only discharging is allowed when the battery energy storage system is in an emergency discharging special area. Therefore, the micro-grid system can freely control the charging and discharging states according to the requirements of the micro-grid, the optimized transportation of energy is realized, the power output of the intermittent new energy power generation system is enabled to follow the change of the load as much as possible, and the utilization rate of new energy is improved.
According to the invention, four SOC nodes are set, and the charging and discharging multiplying power zone control nodes are simultaneously set, so that under the normal working condition of the external environment, if the SOC of the battery energy storage system is in the energy free carrying zone, the charging and discharging state is freely controlled according to the requirements of the external environment, and if the SOC of the battery energy storage system is in the emergency charging special zone, the charging and discharging multiplying power C is adoptedmaxCarrying out emergency charging, only allowing charging but not discharging, and if the SOC of the battery energy storage system is in the emergency discharging special area, according to the charging and discharging multiplying power CmaxEmergency discharging is performed, and only discharging is allowed and charging is not allowed. When the external environment is in an emergency working condition, the battery energy storage system is connected with the battery energy storage system through a connection line CemgAnd CminTimely initiating emergency power control for upper and lower limits to be at SOCminAnd SOCmaxThe control method can realize the fine management of the battery energy storage system, avoid frequent charge-discharge switching, improve the utilization rate of equipment and have better economic benefit.
The battery energy storage system partition control method of the invention gives consideration to two functions of energy transportation and power emergency control, on one hand, the system is ensured to have the power emergency control capability at any time, and on the other hand, the deep charging and deep discharging phenomenon is prevented. Wherein, the emergency power control belongs to the transition process under the condition of large disturbance of the system. After the battery energy storage system is triggered to enter an emergency power control working condition due to the occurrence of large system disturbance, the consequence generated by the disturbance is gradually eliminated through a system control and scheduling management technology, so that the battery energy storage system is returned to a normal energy carrying running state as soon as possible, and the long-time large charging and discharging multiplying power running working condition of the battery is avoided.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention in any way, and it will be apparent to those skilled in the art that the above description of the present invention can be applied to various modifications, equivalent variations or modifications without departing from the spirit and scope of the present invention.
Claims (5)
1. A partition control method of a battery energy storage system is characterized by comprising a charge state partition control method and a charge-discharge multiplying power partition control method which are in synergistic action,
the partitioning steps of the charge state partitioning control method are as follows: setting the SOC of the battery energy storage system into four key nodes SOCmin、SOCdown、SOCupAnd SOCmaxWherein SOC isminAnd SOCmaxLower limit and upper limit of limit operation interval for preventing over charge and discharge of battery, SOCdownAnd SOCupRespectively realizing the lower limit and the upper limit of a normal operation interval for carrying battery energy, wherein SOCmin-SOCdown is an emergency charging special area, SOCdown-SOCup is an energy free carrying area, and SOCup-SOCmax is an emergency discharging special area;
the partition step of the charge and discharge multiplying power partition control method is as follows: setting the charge-discharge multiplying power of the battery energy storage system to be minimum charge-discharge multiplying power CminMaximum charge-discharge multiplying power CmaxAnd emergency charge-discharge multiplying power Cemg；
The synergistic effect method of the charge state zone control method and the charge and discharge multiplying power zone control method comprises the following working conditions:
under normal working conditions, when the SOC is in the SOCminAnd SOCdownIn between, according to the charge-discharge multiplying power CmaxPerforming emergency charging when SOC is in SOCupAnd SOCmaxIn between, according to the charge-discharge multiplying power CmaxEmergency discharging is carried out, and the SOC is quickly returned to the SOCbrown-SOCup interval; when the SOC is at SOCdownAnd SOCupIn between, according to the current charge-discharge state, with the charge-discharge rate CmaxAnd CminMaintaining the ordered charging and discharging of the battery for the upper and lower limits;
under the emergency working condition, when the external environment of the battery energy storage system is in an overload state, the battery energy storage system adopts CemgAnd CminTimely starting emergency power control for upper and lower limits to SOCmix and SOCmaxDischarge between the electrodes; when the external environment of the battery energy storage system is in a light load state, the battery energy storage system is in a state of CemgAnd CminTimely initiating emergency power control for upper and lower limits to be at SOCminAnd SOCmaxAnd (4) charging.
2. The partition control method of the battery energy storage system according to claim 1, further comprising:
when the external environment has large power disturbance, the subarea control method preferentially executes the emergency power control step of quick charge or quick discharge under the emergency working condition;
when the external environment normally operates, when the SOC of the battery energy storage system is in an energy free carrying area, the charging and discharging state is freely controlled according to the requirements of the external environment, when the SOC of the battery energy storage system is in an emergency charging special area, only charging is allowed, and when the SOC of the battery energy storage system is in an emergency discharging special area, only discharging is allowed.
3. The zonal control method of a battery energy storage system according to claim 1 or 2, wherein the external environment is a micro grid, a macro grid or a battery energy storage power station.
4. The partition control method of a battery energy storage system according to claim 3, wherein the microgrid comprises the battery energy storage system, a diesel power generation system, a biomass power generation system, an intermittent energy source power generation system, an AC bus, a load and a microgrid central controller,
the battery energy storage system, the diesel power generation system, the biomass power generation system and the intermittent energy power generation system are respectively connected with the alternating current bus, the alternating current bus is further connected with the load, the battery energy storage system, the diesel power generation system, the biomass power generation system and the intermittent energy power generation system provide electric energy for the load, and the micro-grid central controller is used for managing and optimally scheduling the energy of the micro-grid system.
5. The zonal control method of a battery energy storage system of claim 4, wherein the intermittent energy source power generation system comprises a photovoltaic power generation system and a wind power generation system.
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| CN109904852B (en) * | 2019-04-19 | 2021-03-16 | 华北电力大学（保定） | Active load-based direct current power grid virtual energy storage control method and system |
| CN111106625B (en) * | 2020-01-20 | 2021-03-19 | 集美大学 | Operation management method for wind-solar storage direct-current micro-grid system storage battery pack of floating type offshore radar wind measurement mobile platform |
| CN111769631A (en) * | 2020-06-21 | 2020-10-13 | 中车永济电机有限公司 | Emergency power supply system for motor train unit and control method thereof |
| CN112636337A (en) * | 2020-12-08 | 2021-04-09 | 南京首风智慧电力研究院有限公司 | Dynamic identification and emergency power control strategy for large-disturbance fault of independent micro-grid |
| CN113595182B (en) * | 2021-07-23 | 2022-07-22 | 深圳纬图鸿达实业有限公司 | Safety and stable discharge circuit for UPS |
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