CN111740481B - Energy storage system EMS charging control method - Google Patents
Energy storage system EMS charging control method Download PDFInfo
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- CN111740481B CN111740481B CN202010835553.4A CN202010835553A CN111740481B CN 111740481 B CN111740481 B CN 111740481B CN 202010835553 A CN202010835553 A CN 202010835553A CN 111740481 B CN111740481 B CN 111740481B
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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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/0071—Regulation of charging or discharging current or voltage with a programmable schedule
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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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses an energy storage system EMS charging control method, which is used for self-adapting energy-saving full charging of an energy storage system under the premise of meeting the requirement of a transformer within specified time by estimating the residual charging capacity and combining the existing charging power limit curve and a system energy consumption curve chart in a charging (standby) state. The invention introduces the judgment concept of the charging power setting and the minimum value of the total energy consumption of the charging quantity during the valley period, and regulates the charging electric power of the PCS in real time through the data comparison of the total energy consumption prejudgment on the premise of meeting the requirement of the transformer, thereby realizing the maximum benefit.
Description
Technical Field
The invention relates to energy storage power station system EMS charging control, and belongs to the technical field of energy storage power station control.
Background
The design of the EMS charging strategy of the existing energy storage power station is as follows: on the premise of not considering increasing the transformer demand, constant current charging is generally carried out at fixed power, a system is in a standby state after an energy storage power station is fully charged, and the standby time is influenced by the system capacity and the fixed power of the energy storage power station, so that predictability is achieved. On the premise that the setting of the transformer is not over-demand, charging is carried out according to the charging limiting value, the limiting value changes constantly, the system is in a standby state after the energy storage power station is fully charged, the standby time is not predictable, and the charging efficiency is not necessarily in an optimal design.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides an energy storage system EMS charging control method, which is characterized in that the energy storage system is charged in a self-adaptive energy-saving manner on the premise of meeting the requirement of a transformer within a specified time by estimating the residual charging capacity and combining the existing charging power limit curve and the system energy consumption curve graph in a charging (standby) state.
The technical scheme is as follows: in order to achieve the purpose, the invention adopts the technical scheme that:
an energy storage system EMS charging control method comprises the following steps:
step 1, summarizing longest chargeable time t of valley period energy storage power station according to valley period information of current earth gridt =（t△1+ t△2+t△3+…… t△i+…… t△d）+ tdWherein, ttIndicating the maximum chargeable time of the energy storage station, t△iIndicating the ith time interval, t, of the energy storage system in the charging state△dIndicating the last time interval, t, at the end of the charging state of the energy storage systemdIndicating the system standby time after charging is completed.
Step 2, the allowable demand of the transformer is P, and the total load P is actually measured by the transformerz(without energy storage charging power), energy storage charging power PciAnd the quantity of electricity Q to be charged is also required in the current state of energy storageci，Qci=Qnew×SOH×DOD×（1-SOC）/ηci，QnewRepresents the maximum amount of electricity when the battery is not in use, SOHIndicating the state of health of the battery, DODIndicates the depth of charge and discharge of the battery, SOCRepresents the state of charge,. etaciAnd the comprehensive charging efficiency under the current charging power is shown. The time length t of charging still needed at the current moment of energy storagec=Qci/Pci。
Step 3, charging power setting and total charging energy consumption judgment:
in the system energy consumption curve data in the charging (standby) state, the energy storage charging power P is matchedci≤P-PzAnd satisfy td≥0， tt-Σt△i-td-tcThe working condition is more than or equal to 0, and the total charging energy consumption Q is calculated△1+ Q△2+ Q△3+……Q△i+Qci+QdTaking the energy storage charging power P under the minimum value of the total charging energy consumptionciAs t△iPower set point in interval, consider PzFluctuation frequency and amplitude: pzThe larger the fluctuation frequency and amplitude, the more the interval time t△iThe setting value may be shorter. PzThe smaller the fluctuation frequency and amplitude are, the interval time t is△iThe setting value may be longer, Q△iRepresenting the amount of charge, Q, required by the energy storage system in the ith time intervaldIndicating a standby power loss.
Preferably: the storage isThe longest chargeable time of the energy power station is the valley period duration time specified by the power grid, taking Jiangsu large industry as an example, the valley period is 0: 00-8: 00, tt =8h。
Preferably: the method comprises a load tracking method, a demand control method, a residual charging capacity calculation method and a standby power consumption calculation method.
Preferably: the load tracking method is that real-time load data of the transformer are monitored and uploaded according to the current ground power grid valley period and the factory operation period.
Preferably: the demand control method comprises the steps of monitoring the real-time load power of the transformer and adjusting the energy storage charging power when the energy storage power station is in a charging state in a valley period, so that the total power does not exceed an expected set value.
Preferably: the method for calculating the residual charging capacity is to count the information of the current time period and the subsequent working time period required and collect the current battery SOCAnd calculating the charge quantity required when the battery is fully charged, and using the charge quantity to reference and evaluate the current charging electric power and the charging time length.
Preferably: the standby power consumption calculation method is a calculation method for accumulating energy consumption under different temperature working conditions when equipment is in standby.
Compared with the prior art, the invention has the following beneficial effects:
the invention introduces the judgment concept of the charging power setting and the minimum value of the total energy consumption of the charging quantity during the valley period, and regulates the charging electric power of the PCS in real time through the data comparison of the total energy consumption prejudgment on the premise of meeting the requirement of the transformer, thereby realizing the maximum benefit.
Detailed Description
The invention is further illustrated by the following examples in connection with specific embodiments thereof, it is to be understood that these examples are intended in an illustrative rather than in a limiting sense and that various equivalent modifications of the invention as described herein will occur to those skilled in the art upon reading the present disclosure and are intended to be covered by the appended claims.
The invention designs an energy storage system EMS charging control method, which is characterized in that a load tracking strategy is configured in an energy management system of an energy storage power station,A demand control method, a residual charging capacity calculation strategy and a standby power consumption calculation strategy. The load tracking means: and monitoring and uploading real-time load data of the transformer according to the current power grid valley period and the factory operation period. The demand control method comprises the following steps: and when the energy storage power station is in a charging state in the valley period, monitoring the real-time load power of the transformer, and adjusting the energy storage charging power to ensure that the total power does not exceed an expected set value. The strategy for calculating the residual charging capacity is as follows: counting the information of the current time period and the subsequent working time period required, and collecting the current battery SOCAnd calculating the charging quantity when the battery is fully charged, and using the charging quantity as a reference evaluation for the current charging electric power and charging time, and calculating the standby power consumption calculation strategy and the energy consumption accumulation calculation method (referring to a curve chart which should be actually summarized) according to different temperature working conditions when the equipment is in standby.
Step 1, summarizing longest chargeable time t of valley period energy storage power station according to valley period information of current earth gridt =（t△1+ t△2+t△3+…… t△i+…… t△d）+ tdWherein, ttThe maximum chargeable time of the energy storage power station is represented, and the maximum chargeable time is generally the valley period duration time specified by a power grid (for example, the valley period is 0: 00-8: 00, t in Jiangsu major industry)t =8h），t△iIndicating the ith time interval, Q, of the energy storage system in a charging state△iRepresenting the amount of charge, t, required by the energy storage system in the ith time interval△dIndicating the last time interval, t, at the end of the charging state of the energy storage systemdIndicates the standby time of the system after charging is finished, QdIndicating a standby power loss.
Step 2, the allowable demand of the transformer is P, and the total load P is actually measured by the transformerz(without energy storage charging power), energy storage charging power PciAnd the quantity of electricity Q to be charged is also required in the current state of energy storageci=Qnew×SOH×DOD×（1-SOC）/ηci，QnewRepresents the maximum amount of electricity when the battery is not in use, SOHIndicating the state of health of the battery, DODIndicates the depth of charge and discharge of the battery, SOCTo representState of charge, ηciAnd the comprehensive charging efficiency under the current charging power is shown. The time length t of charging still needed at the current moment of energy storagec=Qci/Pci。
And 3, setting charging power and judging total charging energy consumption.
Matching charging power P in system energy consumption curve data in charging (standby) stateci≤P-PzAnd satisfy td≥0，tt-Σt△i-td-tcThe working condition is more than or equal to 0, and the total charging energy consumption Q is calculated△1+ Q△2+ Q△3+……Q△i+Qci+QdTaking P as the minimum value of total charging energy consumptionciAs t△iThe power set point in the interval time.
The implementation of the existing strategy includes two conditions: a transformer has no demand limit value, and is charged directly according to fixed power, and after the energy storage power station is fully charged, the transformer is always in a standby state before discharge is implemented. And secondly, the transformer has demand limiting requirements, the stored energy is charged in real time according to the charging limiting value, and the energy storage power station is in a standby state after being fully charged and before discharging is carried out. The energy consumption of the total charging quantity can be changed under the influence of the charging power value, the charging time and the loss under the standby condition, and the charging energy-saving property is not realized. By researching the curve relation between the energy storage charging power and the charging energy consumption in advance and introducing EMS prejudgment, the lowest charging energy consumption value can be realized on the premise that the energy storage power station is full, and the maximum benefit of the energy storage power station is realized.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (4)
1. An energy storage system EMS charging control method is characterized by comprising the following steps:
step 1, summarizing longest chargeable time t of valley period energy storage power station according to valley period information of current earth gridt =（t△1+ t△2+t△3+…… t△i+…… t△d）+ tdWherein, ttIndicating the maximum chargeable time of the energy storage station, t△iIndicating the ith time interval, t, of the energy storage system in the charging state△dIndicating the last time interval, t, at the end of the charging state of the energy storage systemdThe standby time of the system after charging is finished is shown;
step 2, the allowable demand of the transformer is P, and the total load P is actually measured by the transformerzStored energy charging power PciAnd the quantity of electricity Q to be charged is also required in the current state of energy storageci，Qci=Qnew×SOH×DOD×（1-SOC）/ηci，QnewRepresents the maximum amount of electricity when the battery is not in use, SOHIndicating the state of health of the battery, DODIndicates the depth of charge and discharge of the battery, SOCRepresents the state of charge,. etaciRepresenting the comprehensive charging efficiency under the current charging power; the time length t of charging still needed at the current moment of energy storagec=Qci/Pci；
Step 3, charging power setting and total charging energy consumption judgment:
in the system energy consumption curve data in the charging state, the energy storage charging power P is matchedci≤P-PzAnd satisfy td≥0，tt-Σt△i-td-tcThe working condition is more than or equal to 0, and the total charging energy consumption Q is calculated△1+ Q△2+ Q△3+……Q△i+Qci+QdTaking the energy storage charging power P under the minimum value of the total charging energy consumptionciAs t△iPower set-point, Q, in intervals△iRepresenting the amount of charge, Q, required by the energy storage system in the ith time intervaldIndicating a standby power loss.
2. The EMS charge control method of claim 1, wherein: the maximum chargeable time of the energy storage power station is the valley period duration time specified by the power grid.
3. The energy storage system EMS charge control method of claim 2, wherein: and the actually measured total load of the transformer does not contain energy storage charging power.
4. The EMS charge control method of claim 3, wherein: the method comprises a load tracking method, a demand control method, a residual charging capacity calculation method and a standby power consumption calculation method, wherein:
the load tracking method comprises the steps of monitoring and uploading real-time load data of the transformer according to the current earth power grid valley period and the factory operation period;
the demand control method comprises the steps of monitoring the real-time load power of the transformer and adjusting the energy storage charging power when the energy storage power station is in a charging state in a valley period so that the total power does not exceed an expected set value;
the method for calculating the residual charging capacity is to count the information of the current time period and the subsequent working time period required and collect the current battery SOCCalculating the charge quantity when the battery is fully charged, and using the charge quantity to reference and evaluate the current charging electric power and the charging time;
the standby power consumption calculation method is a calculation method for accumulating energy consumption under different temperature working conditions when equipment is in standby.
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| CN109301849A (en) * | 2018-09-11 | 2019-02-01 | 国网浙江省电力有限公司电力科学研究院 | A kind of energy management combination control tactics of user side battery energy storage power station |
| CN110535154A (en) * | 2019-10-21 | 2019-12-03 | 合肥阳光新能源科技有限公司 | A kind of energy-storage system and its control method based on SOC management |
| CN111509745A (en) * | 2020-04-24 | 2020-08-07 | 江苏慧智能源工程技术创新研究院有限公司 | Energy storage system EMS discharge control method for solving problem of transformer over-capacity |
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Patent Citations (4)
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| CN109085507A (en) * | 2018-07-31 | 2018-12-25 | 中国电力科学研究院有限公司 | A kind of method and system for assessing energy-storage battery health status |
| CN109301849A (en) * | 2018-09-11 | 2019-02-01 | 国网浙江省电力有限公司电力科学研究院 | A kind of energy management combination control tactics of user side battery energy storage power station |
| CN110535154A (en) * | 2019-10-21 | 2019-12-03 | 合肥阳光新能源科技有限公司 | A kind of energy-storage system and its control method based on SOC management |
| CN111509745A (en) * | 2020-04-24 | 2020-08-07 | 江苏慧智能源工程技术创新研究院有限公司 | Energy storage system EMS discharge control method for solving problem of transformer over-capacity |
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