CN111864805A - Energy management method of industrial park micro-grid light storage combined power generation device - Google Patents

Energy management method of industrial park micro-grid light storage combined power generation device Download PDF

Info

Publication number
CN111864805A
CN111864805A CN202010870592.8A CN202010870592A CN111864805A CN 111864805 A CN111864805 A CN 111864805A CN 202010870592 A CN202010870592 A CN 202010870592A CN 111864805 A CN111864805 A CN 111864805A
Authority
CN
China
Prior art keywords
power
formula
inv
grid
time
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202010870592.8A
Other languages
Chinese (zh)
Other versions
CN111864805B (en
Inventor
毕锐
张震
吴红斌
朱正轩
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hefei University of Technology
Original Assignee
Hefei University of Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hefei University of Technology filed Critical Hefei University of Technology
Priority to CN202010870592.8A priority Critical patent/CN111864805B/en
Publication of CN111864805A publication Critical patent/CN111864805A/en
Application granted granted Critical
Publication of CN111864805B publication Critical patent/CN111864805B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • 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
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/10—Photovoltaic [PV]
    • 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers
    • 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
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00—Climate change mitigation technologies for sector-wide applications
    • Y02P80/20—Climate change mitigation technologies for sector-wide applications using renewable energy

Landscapes

  • 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 management method of an optical storage combined power generation device of an industrial park microgrid, which comprises the following steps of 1, constructing a topological structure of the optical storage combined power generation device in the industrial park microgrid; 2, establishing a relation among the input and output power of the inverter, the photovoltaic output and the charge and discharge power of the storage battery based on the light storage combined power generation device; and 3, considering the time-of-use electricity price and the real-time control of the storage battery, and establishing a control scheme of the micro-grid light-storage combined power generation device in the industrial park. The method can more reasonably control the power flow of the optical storage combined power generation device, reduce the internal loss and the conversion efficiency of the optical storage combined power generation device while keeping the voltage on the direct current bus side stable, optimize the power flow of the industrial park microgrid distribution line, reduce the line loss, enable the industrial park microgrid to be in a high-efficiency economic operation state, and further improve the operation level of the industrial park microgrid.

Description

Energy management method of industrial park micro-grid light storage combined power generation device
Technical Field
The invention relates to an energy management technology of a microgrid in an industrial park, in particular to an energy management method of a microgrid optical storage combined power generation device in the industrial park.
Background
With the gradual aggravation of energy crisis and environmental crisis, under the large background of the continuous development of energy internet, the energy structure change taking electric power as the core is deepening continuously, and distributed power generation is more and more emphasized. The installed capacity of new energy such as photovoltaic and the like is continuously increased, but the phenomena of poor electric energy quality, difficulty in absorption, wind abandon and light abandon occur due to the fluctuation, randomness and non-schedulability of distributed power generation. The micro-grid is an important means for comprehensive management and utilization of distributed power supplies, and the demand for building a small-sized optical storage micro-grid in a park is increasingly urgent.
At present, the energy management method of the microgrid in the industrial park is mainly based on time-of-use electricity price, the influence of charge-discharge depth and charge-discharge current multiplying power on the charge-discharge service life of a storage battery is not considered, the real-time efficiency of a DC/AC converter is neglected to be related to input and output power, the power of the DC/AC converter is low, and the energy management method is too comprehensive. At present, as the price of photovoltaic subsidy is further reduced, the photovoltaic flat price internet surfing is gradually realized, and in addition, with the continuous expansion of the scale of a distributed photovoltaic installation machine in an industrial park and the reduction of the equipment cost of an energy storage system and the like, the direct-current type light-storage combined power generation device is widely applied. However, the energy management method for the industrial park microgrid is mainly formulated according to the topological structure of the alternating current type optical storage combined power generation system, that is, the photovoltaic and the stored energy are directly connected to the alternating current bus side through respective interface converters, and in this case, the energy management of the industrial park microgrid mainly keeps the voltage of the alternating current power grid relatively stable and realizes the electricity price arbitrage, but the energy management method causes the converter with large loss inside the microgrid system to have low power conversion efficiency, and the microgrid energy management method is too simple.
Disclosure of Invention
The invention provides an energy management method of an industrial park microgrid optical storage combined power generation device, aiming at overcoming the defects in the prior art, so that the power flow of the optical storage combined power generation device can be more reasonably controlled, the internal loss and the conversion efficiency of the optical storage combined power generation device are reduced while the voltage on the direct-current bus side is kept stable, the power flow of an industrial park microgrid power distribution line is optimized, the line loss is reduced, the industrial park microgrid is in a high-efficiency economic operation state, and the operation level of the industrial park microgrid is improved.
The invention solves the technical problems through the following technical scheme:
the invention relates to an energy management method of a micro-grid optical storage combined power generation device in an industrial park, which is characterized by comprising the following steps of:
step 1, building a topological structure of a light storage combined power generation device in an industrial park microgrid;
the photovoltaic power generation unit and the energy storage unit are respectively connected in parallel on a common direct current bus after passing through respective DC/DC converters, so that power is directly supplied to a direct current load, and the photovoltaic power generation unit and the energy storage unit are also respectively connected with an alternating current bus after passing through a common DC/AC inverter, so as to supply power to the alternating current load together with commercial power;
step 2, establishing a constraint relation among the real-time output power of the optical storage combined power generation device, the real-time output power of the photovoltaic power generation unit and the real-time charge and discharge power of the storage battery based on the topological structure of the optical storage combined power generation device;
and 3, considering the time-of-use electricity price and the real-time control of the storage battery, and establishing an energy management scheme of the optical storage combined power generation device in the microgrid of the industrial park, wherein the energy management scheme comprises the following steps: the system comprises an energy management scheme of the industrial park microgrid photovoltaic-storage combined power generation device at off-peak electricity prices, an energy management scheme of the industrial park microgrid photovoltaic-storage combined power generation device at peak electricity prices and an energy management scheme of the industrial park microgrid photovoltaic-storage combined power generation device at ordinary-time electricity prices.
The energy management method according to the present invention is also characterized in that the step 2 includes:
step 2.1, obtaining the output power P of the DC/AC inverter by using the formula (1)inv,outAnd input power Pinv,inThe relation between:
Pinv,out(t)＝ηinv(t)·Pinv,in(t) (1)
in the formula (1), etainv(t) conversion efficiency of the DC/AC inverter under different load rates; pinv,in(t) is the input power of the DC/AC inverter; pinv,out(t) is the output power of the DC/AC inverter;
step 2.2, when the photovoltaic power generation unit and the external power grid charge the storage battery together, establishing the balance constraint of the direct-current side bus power of the photovoltaic power generation device by using the formula (2):
Figure BDA0002650977050000021
in the formula (2), Ppv(t) is the output at photovoltaic time t; pch(t) is the charging power of the storage battery at the moment t; etaDCThe conversion efficiency of the DC/DC rectifier; etachCharging efficiency for the battery;
establishing balance constraint of alternating-current side bus power of the optical storage combined power generation device by using the formula (3):
Pgrid(t)＝Pinv,in(t)+Pload(t) (3)
in the formula (3), Pgrid(t) is the interaction power between the industrial park microgrid and the external power grid at the time t; pload(t) is the load value of the industrial park at the time t;
and 2.3, when the photovoltaic power generation unit and the storage battery supply power to the alternating current load together, establishing the balance constraint of the direct current side bus power of the optical storage combined power generation device by using the formula (4):
Pinv,in(t)＝Ppv(t)ηDC+Pdisch(t)ηdischηDC(4)
in the formula (4), Pdisch(t) is the charging power of the storage battery at the moment t; etadischDischarging efficiency for the battery;
and (3) establishing balance constraint of the alternating-current side bus power of the optical storage combined power generation device by using the formula (5):
Pgrid(t)+Pinv,out(t)＝Pload(t) (5)
in the formula (5), Pdisch(t) of the accumulator at time tA charging power; a sign for purchasing and selling electricity; when the micro-grid is in a power purchasing state, the micro-grid in the industrial park is represented as 1; when the micro-grid of the industrial park is in a power selling state, the micro-grid of the industrial park is represented as-1; when the value is 0, the industrial park microgrid is in an island operation state;
step 2.4, when the photovoltaic power generation unit supplies power to the alternating current load and the storage battery at the same time, establishing the balance constraint of the direct current side bus power of the optical storage combined power generation device by using the formula (6):
Figure BDA0002650977050000031
and (3) establishing balance constraint of the alternating-current side bus power of the optical storage combined power generation device by using the formula (7):
Pgrid(t)+Pinv,out(t)＝Pload(t) (7)。
the energy management scheme of the industrial park micro-grid light storage combined power generation device in the valley time electricity price in the step 3 comprises the following steps:
step 3.1a, judging whether power needs to be supplied to the storage battery unit by using the formula (8), and if the formula (8) is met, executing the step 3.2 a; otherwise, the storage battery is charged with power Pch(t) 0, let the input power P of the DC/AC inverterinv,in(t)＝Ppv(t) and determining the output power P of the DC/AC inverter using equation (9)inv,out(t)：
SOC(t)≤SOCmax(8)
Pinv,out(t)+Pgrid(t)＝Pload(t)+ΔPloss(t) (9)
In the formula (8), soc (t) is the charge amount of the battery at time t; SOCmax is the maximum charge capacity of the storage battery;
step 3.2a, judging whether the storage battery needs to be charged through the alternating current bus side by using the formula (13), and if the formula (13) is met, executing the step 3.3a to the step 3.6 a; otherwise, executing step 3.7;
Figure BDA0002650977050000032
in the formula (13), SOCmaxFor storing energyMaximum state of charge of the device; SOC (t-1) is the state of charge of the storage battery at the previous moment; eessThe rated capacity of the storage battery; Δ t is a scheduling time interval; etaDCBattery DC/DC converter efficiency; pch,maxThe maximum charging power of the storage battery is obtained;
step 3.3a, obtaining the charging power P of the storage battery at the time t by using the formula (14)ch(t)：
Figure BDA0002650977050000041
Step 3.4a, obtaining the input power P of the DC/AC inverter at the time t by using the formula (15)inv,in(t)：
Figure BDA0002650977050000042
In the formula (15), etainv(t) is the conversion efficiency of the grid-connected inverter at time t;
step 3.5a, obtaining the tie line power P between the microgrid of the industrial park and the power grid at the time t by using the formula (16)grid(t)：
Pgrid(t)+Pinv,out(t)＝Pload(t) (16)
Step 3.6a, obtaining the charging power P of the storage battery at the time t by using the formula (17)ch(t)：
Figure BDA0002650977050000043
Step 3.7a, obtaining the input power P of the DC/AC inverter at the time t by using the formula (18)inv,out(t)：
Figure BDA0002650977050000044
Step 3.8a, obtaining the tie line power P between the microgrid of the industrial park and the power grid at the time t by using the formula (19)grid(t)：
Pgrid(t)＝Pinv,in(t)+Pload(t) (19)。
The energy management scheme of the micro-grid optical storage combined power generation device of the industrial park at peak time electricity price in the step 3 is as follows:
step 3.1b, judging whether the storage battery needs to be discharged or not by using the formula (20), if so, indicating that the storage battery does not need to be discharged, and simultaneously purchasing power from a power grid in the industrial park micro-grid; otherwise, executing step 3.2 b;
Ppv(t)ηDCηinv(t)≥Pload(t) (20)
step 3.2b, obtaining the discharge power P of the storage battery at the time t by using the formula (21)disch(t)：
Figure BDA0002650977050000045
Step 3.3b, obtaining the input power P of the DC/AC inverter at the time t by using the formula (22)inv,in(t)：
Figure BDA0002650977050000046
Step 3.4b, obtaining the power P of the tie line between the microgrid of the industrial park and the power grid at the time t by utilizing the formula (23)grid(t)：
Pgrid(t)＝max{(Pload(t)-Pinv,out(t)),0} (23)。
The energy management scheme of the industrial park microgrid optical storage combined power generation device in the usual electricity price in the step 3 comprises the following steps:
step 3.1c, obtaining the input power P of the DC/AC inverter at the time t by using the formula (24)inv,in(t)：
Pinv,in(t)＝Ppv(t)·ηpv(24)
And 3.2c, obtaining the state of charge SOC (t) of the storage battery at the time t by the formula (25):
SOC(t)＝SOC(t-1) (25)
step 3.3c, obtaining the power P of the tie line between the microgrid of the industrial park and the power grid at the time t through the formula (26)grid(t)：
Pgrid(t)+Pinv,out(t)＝Pload(t) (26)。
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention provides a topological structure for constructing the optical storage combined power generation device, so that the power of a photovoltaic unit and the power of an energy storage unit flows on the side of a direct current bus, and the internal loss and the power conversion efficiency of the optical storage type micro-grid are effectively reduced;
(2) the energy management method is based on time-of-use electricity price and storage battery real-time control, reasonable and efficient power flowing of the micro-grid in the industrial park is achieved, and meanwhile the service life of the storage battery is prolonged;
(3) the energy management method of the invention considers that the conversion efficiency of the inverter is influenced by the real-time input and output power of the inverter, thus being beneficial to improving the energy conversion efficiency and reducing the power loss in the device;
drawings
Fig. 1 is a schematic flow chart of an energy management method of an industrial park microgrid optical storage combined power generation device according to the present invention;
fig. 2 is a diagram of an energy management method of the micro-grid optical storage combined power generation device in the off-peak electricity price industrial park according to the invention;
fig. 3 is a diagram of an energy management method of the micro-grid optical storage combined power generation device in the peak-hour electricity price industrial park.
Detailed Description
In this embodiment, as shown in fig. 1, an energy management method for an industrial park microgrid optical storage combined power generation apparatus includes the following steps:
step 1, building a topological structure of a light storage combined power generation device in an industrial park microgrid;
the light-storage combined power generation device is provided with two direct current ports and one alternating current port, one direct current port is connected with the photovoltaic array, the other direct current port is connected with the energy storage element, and conversion between direct current electric energy and conversion between direct current electric energy and alternating current electric energy can be realized. The photovoltaic power generation unit and the energy storage unit are respectively connected in parallel on a common direct current bus after passing through respective DC/DC converters, so that power is directly supplied to a direct current load, and the photovoltaic power generation unit and the energy storage unit are also respectively connected with an alternating current bus after passing through a common DC/AC inverter, so that power is supplied to the alternating current load together with commercial power.
Step 2, establishing a constraint relation among the real-time output power of the optical storage combined power generation device, the real-time output power of the photovoltaic power generation unit and the real-time charge and discharge power of the storage battery based on the topological structure of the optical storage combined power generation device;
step 2.1, obtaining the output power P of the DC/AC inverter by using the formula (1)inv,outAnd input power Pinv,inThe relation between:
Pinv,out(t)＝ηinv(t)·Pinv,in(t) (1)
in the formula (1), etainv(t) conversion efficiency of the DC/AC inverter under different load rates; pinv,in(t) is the input power of the DC/AC inverter; pinv,out(t) is the output power of the DC/AC inverter;
step 2.2, when the photovoltaic power generation unit and the external power grid charge the storage battery together, establishing the direct-current side bus power balance constraint of the photovoltaic power generation device by using the formula (2):
Figure BDA0002650977050000061
in the formula (2), Ppv(t) is the output at photovoltaic time t; pch(t) is the charging power of the storage battery at the moment t; etaDCThe conversion efficiency of the DC/DC rectifier; etachCharging efficiency for the battery;
establishment of AC side bus power balance constraint of light storage combined power generation device by using formula (3)
Pgrid(t)＝Pinv,in(t)+Pload(t) (3)
In the formula (3), Pgrid(t) is the interaction power between the industrial park microgrid and an external power grid; pload(t) is the load value at time t of the industrial park.
And 2.3, when the photovoltaic power generation unit and the storage battery supply power to the alternating current load together, establishing the direct current side bus power balance constraint of the optical storage combined power generation device by using the formula (4):
Pinv,in(t)＝Ppv(t)ηDC+Pdisch(t)ηdischηDC(4)
in the formula (4), Pdisch(t) is the charging power of the storage battery at the moment t; etadischThe discharge efficiency of the storage battery is obtained.
Establishing the power balance constraint of the alternating-current side bus of the optical storage combined power generation device by using the formula (5):
Pgrid(t)+Pinv,out(t)＝Pload(t) (5)
in the formula (5), Pdisch(t) is the charging power of the storage battery at the moment t; a sign for purchasing and selling electricity; 1 represents that the microgrid in the industrial park is in a power purchasing state; the micro-grid of the industrial park is in a power selling state as-1; the micro-grid of the industrial park is in an island operation state as 0;
and 2.4, when the photovoltaic power generation unit supplies power to the alternating current load and the storage battery at the same time, carrying out power balance constraint on a direct current side bus of the combined light-storage power generation device by using a formula (6):
Figure BDA0002650977050000071
establishing the power balance constraint of the alternating-current side bus of the optical storage combined power generation device by using the formula (7):
Pgrid(t)+Pinv,out(t)＝Pload(t) (7)
step 3, based on time-of-use electricity price and real-time control of the storage battery units, an energy management scheme of the industrial park microgrid light-storage combined power generation device at the time of the off-peak electricity price is given, and is shown in fig. 2;
when the micro-grid energy management system is used for managing the micro-grid energy of the industrial park, the service life of a storage battery is prolonged while the time-of-use electricity price is considered, the influence of the power conversion efficiency of a DC/AC inverter is also considered, the power loss in the conversion process can be reduced, and the scheduling flexibility of the energy management system is enhanced.
When the electricity price is at the valley time, the photovoltaic unit is required to supply power to the storage battery unit preferentially, so that the storage battery is in a full charge state. When the photovoltaic output is not enough to make the storage battery in a full charge state, electricity can be purchased from an external power grid. When the photovoltaic output is large, the storage battery is charged and simultaneously the load is supplied with power.
Step 3.1a, judging whether power needs to be supplied to the storage battery unit by using the formula (8), and if the formula (8) is met, executing the step 3.2 a; otherwise, the storage battery is charged with power Pch(t) 0, let the input power P of the DC/AC inverterinv,in(t)＝Ppv(t) and determining the output power P of the DC/AC inverter using equation (9)inv,out(t)：
SOC(t)≤SOCmax(8)
Pinv,out(t)+Pgrid(t)＝Pload(t)+ΔPloss(t) (9)
In the formula (8), soc (t) is the charge amount of the battery at time t; SOCmax is the maximum charge capacity of the storage battery;
step 3.2a, judging whether the storage battery needs to be charged through the alternating current bus side by using the formula (13), and if the formula (13) is met, executing the step 3.3a to the step 3.6 a; otherwise, executing step 3.7;
Figure BDA0002650977050000072
in the formula (13), SOCmaxIs the maximum state of charge of the energy storage device; SOC (t-1) is the state of charge of the storage battery at the previous moment; eessThe rated capacity of the storage battery; Δ t is a scheduling time interval; etaDCBattery DC/DC converter efficiency; pch,maxThe maximum charging power of the storage battery is obtained;
step 3.3a, obtaining the charging power P of the storage battery at the time t by using the formula (14)ch(t)：
Figure BDA0002650977050000081
Step 3.4a, obtaining the input power P of the DC/AC inverter at the time t by using the formula (15)inv,in(t)：
Figure BDA0002650977050000082
In the formula (15), etainv(t) is the conversion efficiency of the grid-connected inverter at time t;
step 3.5a, obtaining the tie line power P between the microgrid of the industrial park and the power grid at the time t by using the formula (16)grid(t)：
Pgrid(t)+Pinv,out(t)＝Pload(t) (16)
And 3.6a, obtaining the charging power of the storage battery at the time t by using the formula (17):
Figure BDA0002650977050000083
step 3.7a, obtaining the input power P of the DC/AC inverter at the time t by using the formula (18)inv,out(t)：
Figure BDA0002650977050000084
Step 3.8a, obtaining the tie line power P between the microgrid of the industrial park and the power grid at the time t by using the formula (19)grid(t)：
Pgrid(t)＝Pinv,in(t)+Pload(t) (19)
And 4, during peak electricity price, the photovoltaic power generation unit and the storage battery unit preferentially supply power to the load on the alternating current side, and when the output of the light storage combined power generation device is smaller than the load demand, extra load difference is required to be met by purchasing power to an external power grid. Based on time-of-use electricity price and real-time control of the storage battery unit, an energy management scheme of the micro-grid light storage combined power generation device in the industrial park at the time of peak electricity price is given, and is shown in fig. 3:
step 4.1, judging whether the storage battery needs to be discharged or not by using the formula (20), if so, supplying power to the alternating current bus side only by the output of the photovoltaic unit through the rectification conversion device, wherein the storage battery does not need to be discharged, so that the service life loss of the storage battery caused by charging and discharging is reduced, and meanwhile, the micro-grid of the industrial park does not need to purchase power from a power grid, so that the operation cost of the industrial park is reduced; otherwise, the storage battery unit and the photovoltaic unit are required to supply power to the load at the alternating current side through a common DC/AC inverter, and the step 4.2 is executed for reducing the loss of the inverter power conversion process and prolonging the use of the storage battery due to the maximum output power constraint of the inverter;
Ppv(t)ηDCηinv(t)≥Pload(t) (20)
step 4.2, the discharge power P of the storage battery at the time t is given by using the formula (21)disch(t)：
Figure BDA0002650977050000091
Step 4.3, obtaining the input power P of the DC/AC inverter at the time t by using the formula (22)inv,in(t)：
Figure BDA0002650977050000092
Step 4.4, obtaining the power P of the tie line between the microgrid of the industrial park and the power grid at the time t by using the formula (23)grid(t)：
Pgrid(t)＝max{(Pload(t)-Pinv,out(t)),0} (23)
And 5, during the usual electricity price, comprehensively considering the operation and maintenance cost and the electricity purchasing cost in the light storage operation process, and reducing the energy interaction between the light storage combined power generation device and the alternating current bus side, wherein the storage battery is in a floating charge state so as to reduce the service life loss. Based on the real-time control of time-of-use electricity price and storage battery, the energy management scheme of the industrial park micro-grid light storage combined power generation device during the time-of-use electricity price is given:
step 5.1, obtaining the input power P of the DC/AC inverter at the time t by using the formula (24)inv,in(t)：
Pinv,in(t)＝Ppv(t)·ηpv(24)
And 5.2, obtaining the state of charge SOC (t) of the storage battery at the time t by the formula (25):
SOC(t)＝SOC(t-1) (25)
step 5.3, get throughObtaining power P of a tie line between the microgrid of the industrial park and the power grid at the moment t by an over-type (26)grid(t)：
Pgrid(t)+Pinv,out(t)＝Pload(t) (26)。

Claims (5)

1. An energy management method of an industrial park microgrid optical storage combined power generation device is characterized by comprising the following steps:
step 1, building a topological structure of a light storage combined power generation device in an industrial park microgrid;
the photovoltaic power generation unit and the energy storage unit are respectively connected in parallel on a common direct current bus after passing through respective DC/DC converters, so that power is directly supplied to a direct current load, and the photovoltaic power generation unit and the energy storage unit are also respectively connected with an alternating current bus after passing through a common DC/AC inverter, so as to supply power to the alternating current load together with commercial power;
step 2, establishing a constraint relation among the real-time output power of the optical storage combined power generation device, the real-time output power of the photovoltaic power generation unit and the real-time charge and discharge power of the storage battery based on the topological structure of the optical storage combined power generation device;
and 3, considering the time-of-use electricity price and the real-time control of the storage battery, and establishing an energy management scheme of the optical storage combined power generation device in the microgrid of the industrial park, wherein the energy management scheme comprises the following steps: the system comprises an energy management scheme of the industrial park microgrid photovoltaic-storage combined power generation device at off-peak electricity prices, an energy management scheme of the industrial park microgrid photovoltaic-storage combined power generation device at peak electricity prices and an energy management scheme of the industrial park microgrid photovoltaic-storage combined power generation device at ordinary-time electricity prices.
2. The energy management method of claim 1, wherein the step 2 comprises:
step 2.1, obtaining the output power P of the DC/AC inverter by using the formula (1)inv,outAnd input power Pinv,inThe relation between:
Pinv,out(t)＝ηinv(t)·Pinv,in(t) (1)
in the formula (1), etainv(t) DC/AC inverter at different load ratiosThe conversion efficiency of (a); pinv,in(t) is the input power of the DC/AC inverter; pinv,out(t) is the output power of the DC/AC inverter;
step 2.2, when the photovoltaic power generation unit and the external power grid charge the storage battery together, establishing the balance constraint of the direct-current side bus power of the photovoltaic power generation device by using the formula (2):
Figure FDA0002650977040000011
in the formula (2), Ppv(t) is the output at photovoltaic time t; pch(t) is the charging power of the storage battery at the moment t; etaDCThe conversion efficiency of the DC/DC rectifier; etachCharging efficiency for the battery;
establishing balance constraint of alternating-current side bus power of the optical storage combined power generation device by using the formula (3):
Pgrid(t)＝Pinv,in(t)+Pload(t) (3)
in the formula (3), Pgrid(t) is the interaction power between the industrial park microgrid and the external power grid at the time t; pload(t) is the load value of the industrial park at the time t;
and 2.3, when the photovoltaic power generation unit and the storage battery supply power to the alternating current load together, establishing the balance constraint of the direct current side bus power of the optical storage combined power generation device by using the formula (4):
Pinv,in(t)＝Ppv(t)ηDC+Pdisch(t)ηdischηDC(4)
in the formula (4), Pdisch(t) is the charging power of the storage battery at the moment t; etadischDischarging efficiency for the battery;
and (3) establishing balance constraint of the alternating-current side bus power of the optical storage combined power generation device by using the formula (5):
Pgrid(t)+Pinv,out(t)＝Pload(t) (5)
in the formula (5), Pdisch(t) is the charging power of the storage battery at the moment t; a sign for purchasing and selling electricity; when the micro-grid is in a power purchasing state, the micro-grid in the industrial park is represented as 1; when is ═ -1 tableShowing that the microgrid in the industrial park is in a power selling state; when the value is 0, the industrial park microgrid is in an island operation state;
step 2.4, when the photovoltaic power generation unit supplies power to the alternating current load and the storage battery at the same time, establishing the balance constraint of the direct current side bus power of the optical storage combined power generation device by using the formula (6):
Figure FDA0002650977040000021
and (3) establishing balance constraint of the alternating-current side bus power of the optical storage combined power generation device by using the formula (7):
Pgrid(t)+Pinv,out(t)＝Pload(t) (7)。
3. the energy management method according to claim 2, wherein the energy management scheme for the industrial park microgrid optical storage combined power generation device at the valley time electricity price in the step 3 comprises:
step 3.1a, judging whether power needs to be supplied to the storage battery unit by using the formula (8), and if the formula (8) is met, executing the step 3.2 a; otherwise, the storage battery is charged with power Pch(t) 0, let the input power P of the DC/AC inverterinv,in(t)＝Ppv(t) and determining the output power P of the DC/AC inverter using equation (9)inv,out(t)：
SOC(t)≤SOCmax(8)
Pinv,out(t)+Pgrid(t)＝Pload(t)+ΔPloss(t) (9)
In the formula (8), soc (t) is the charge amount of the battery at time t; SOC max is the maximum charge capacity of the storage battery;
step 3.2a, judging whether the storage battery needs to be charged through the alternating current bus side by using the formula (13), and if the formula (13) is met, executing the step 3.3a to the step 3.6 a; otherwise, executing step 3.7;
Figure FDA0002650977040000022
in the formula (13)，SOCmaxIs the maximum state of charge of the energy storage device; SOC (t-1) is the state of charge of the storage battery at the previous moment; eessThe rated capacity of the storage battery; Δ t is a scheduling time interval; etaDCBattery DC/DC converter efficiency; pch,maxThe maximum charging power of the storage battery is obtained;
step 3.3a, obtaining the charging power P of the storage battery at the time t by using the formula (14)ch(t)：
Figure FDA0002650977040000031
Step 3.4a, obtaining the input power P of the DC/AC inverter at the time t by using the formula (15)inv,in(t)：
Figure FDA0002650977040000032
In the formula (15), etainv(t) is the conversion efficiency of the grid-connected inverter at time t;
step 3.5a, obtaining the tie line power P between the microgrid of the industrial park and the power grid at the time t by using the formula (16)grid(t)：
Pgrid(t)+Pinv,out(t)＝Pload(t) (16)
Step 3.6a, obtaining the charging power P of the storage battery at the time t by using the formula (17)ch(t)：
Figure FDA0002650977040000033
Step 3.7a, obtaining the input power P of the DC/AC inverter at the time t by using the formula (18)inv,out(t)：
Figure FDA0002650977040000034
Step 3.8a, obtaining the tie line power P between the microgrid of the industrial park and the power grid at the time t by using the formula (19)grid(t)：
Pgrid(t)＝Pinv,in(t)+Pload(t) (19)。
4. The energy management method according to claim 2, wherein the energy management scheme of the peak-time electricity rate industrial park microgrid optical storage combined power generation device in the step 3 is as follows:
step 3.1b, judging whether the storage battery needs to be discharged or not by using the formula (20), if so, indicating that the storage battery does not need to be discharged, and simultaneously purchasing power from a power grid in the industrial park micro-grid; otherwise, executing step 3.2 b;
Ppv(t)ηDCηinv(t)≥Pload(t) (20)
step 3.2b, obtaining the discharge power P of the storage battery at the time t by using the formula (21)disch(t)：
Figure FDA0002650977040000035
Step 3.3b, obtaining the input power P of the DC/AC inverter at the time t by using the formula (22)inv,in(t)：
Figure FDA0002650977040000041
Step 3.4b, obtaining the power P of the tie line between the microgrid of the industrial park and the power grid at the time t by utilizing the formula (23)grid(t)：
Pgrid(t)＝max{(Pload(t)-Pinv,out(t)),0} (23)。
5. The energy management method according to claim 2, wherein the energy management scheme for the industrial park microgrid optical storage combined power generation device at the time of flat electricity price in the step 3 comprises:
step 3.1c, obtaining the input power P of the DC/AC inverter at the time t by using the formula (24)inv,in(t)：
Pinv,in(t)＝Ppv(t)·ηpv(24)
And 3.2c, obtaining the state of charge SOC (t) of the storage battery at the time t by the formula (25):
SOC(t)＝SOC(t-1) (25)
step 3.3c, obtaining the power P of the tie line between the microgrid of the industrial park and the power grid at the time t through the formula (26)grid(t)：
Pgrid(t)+Pinv,out(t)＝Pload(t) (26)。
CN202010870592.8A 2020-08-26 2020-08-26 Energy management method of industrial park micro-grid light storage combined power generation device Active CN111864805B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010870592.8A CN111864805B (en) 2020-08-26 2020-08-26 Energy management method of industrial park micro-grid light storage combined power generation device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010870592.8A CN111864805B (en) 2020-08-26 2020-08-26 Energy management method of industrial park micro-grid light storage combined power generation device

Publications (2)

Publication Number Publication Date
CN111864805A true CN111864805A (en) 2020-10-30
CN111864805B CN111864805B (en) 2021-11-09

Family

ID=72968246

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010870592.8A Active CN111864805B (en) 2020-08-26 2020-08-26 Energy management method of industrial park micro-grid light storage combined power generation device

Country Status (1)

Country Link
CN (1) CN111864805B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117833429A (en) * 2024-01-09 2024-04-05 清安储能技术(重庆)有限公司 Coordinated control method and system for light storage and charge system for delaying battery aging

Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104052082A (en) * 2014-06-25 2014-09-17 国家电网公司 Off-grid and grid-connected operation light and storage joint power supply system
CN104319816A (en) * 2014-11-17 2015-01-28 合肥工业大学 Optical storage alternating current and direct current hybrid micro-grid system and control method thereof
CN105552952A (en) * 2015-12-10 2016-05-04 国网上海市电力公司 Photovoltaic-energy storage hybrid power generation system and energy management method therefor
US20160125556A1 (en) * 2014-10-29 2016-05-05 Solarcity Corporation Power management message bus system
CN106026150A (en) * 2016-05-12 2016-10-12 中国电力科学研究院 Business park source-storage-load optimized configuration method
CN106651026A (en) * 2016-12-20 2017-05-10 太原理工大学 Multi-time-scale micro grid energy management optimization scheduling method
CN108539739A (en) * 2018-05-10 2018-09-14 安徽理工大学 Micro-capacitance sensor runs energy management optimization method
CN109193812A (en) * 2018-09-25 2019-01-11 科大智能（合肥）科技有限公司 A kind of garden light storage lotus micro-capacitance sensor economic load dispatching implementation method
CN109217290A (en) * 2018-08-28 2019-01-15 南京理工大学 Meter and the microgrid energy optimum management method of electric car charge and discharge
CN109301853A (en) * 2018-12-17 2019-02-01 国网江苏省电力公司经济技术研究院 A kind of micro-capacitance sensor Multiple Time Scales energy management method for stabilizing power swing
CN109347138A (en) * 2018-09-25 2019-02-15 科大智能（合肥）科技有限公司 A kind of garden light storage micro-capacitance sensor control method
CN109617104A (en) * 2018-12-07 2019-04-12 国家电网有限公司 Grid control method is filled in a kind of storage of light
CN110070216A (en) * 2019-04-11 2019-07-30 河海大学 A kind of industrial park integrated energy system economic operation optimization method
CN110277781A (en) * 2019-03-26 2019-09-24 国网浙江省电力有限公司嘉兴供电公司 The Economic Dispatch method of garden power grid is filled in a kind of storage containing light
CN110880759A (en) * 2019-11-25 2020-03-13 合肥阳光新能源科技有限公司 Energy management method and system of light storage micro-grid based on real-time electricity price mechanism
KR20200079755A (en) * 2018-12-26 2020-07-06 주식회사 이엘티 Microgrid system considering load environment and the Methods of operation

Patent Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104052082A (en) * 2014-06-25 2014-09-17 国家电网公司 Off-grid and grid-connected operation light and storage joint power supply system
US20160125556A1 (en) * 2014-10-29 2016-05-05 Solarcity Corporation Power management message bus system
CN104319816A (en) * 2014-11-17 2015-01-28 合肥工业大学 Optical storage alternating current and direct current hybrid micro-grid system and control method thereof
CN105552952A (en) * 2015-12-10 2016-05-04 国网上海市电力公司 Photovoltaic-energy storage hybrid power generation system and energy management method therefor
CN106026150A (en) * 2016-05-12 2016-10-12 中国电力科学研究院 Business park source-storage-load optimized configuration method
CN106651026A (en) * 2016-12-20 2017-05-10 太原理工大学 Multi-time-scale micro grid energy management optimization scheduling method
CN108539739A (en) * 2018-05-10 2018-09-14 安徽理工大学 Micro-capacitance sensor runs energy management optimization method
CN109217290A (en) * 2018-08-28 2019-01-15 南京理工大学 Meter and the microgrid energy optimum management method of electric car charge and discharge
CN109193812A (en) * 2018-09-25 2019-01-11 科大智能（合肥）科技有限公司 A kind of garden light storage lotus micro-capacitance sensor economic load dispatching implementation method
CN109347138A (en) * 2018-09-25 2019-02-15 科大智能（合肥）科技有限公司 A kind of garden light storage micro-capacitance sensor control method
CN109617104A (en) * 2018-12-07 2019-04-12 国家电网有限公司 Grid control method is filled in a kind of storage of light
CN109301853A (en) * 2018-12-17 2019-02-01 国网江苏省电力公司经济技术研究院 A kind of micro-capacitance sensor Multiple Time Scales energy management method for stabilizing power swing
KR20200079755A (en) * 2018-12-26 2020-07-06 주식회사 이엘티 Microgrid system considering load environment and the Methods of operation
CN110277781A (en) * 2019-03-26 2019-09-24 国网浙江省电力有限公司嘉兴供电公司 The Economic Dispatch method of garden power grid is filled in a kind of storage containing light
CN110070216A (en) * 2019-04-11 2019-07-30 河海大学 A kind of industrial park integrated energy system economic operation optimization method
CN110880759A (en) * 2019-11-25 2020-03-13 合肥阳光新能源科技有限公司 Energy management method and system of light storage micro-grid based on real-time electricity price mechanism

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
LIANG ZHOU等: "Optimization of design and application of micro-grid energy management system data acquisition system", 《THE 2ND INTERNATIONAL SYMPOSIUM ON POWER ELECTRONICS FOR DISTRIBUTED GENERATION SYSTEMS》 *
卫婧菲等: "居民小区电动汽车光伏充电站三分段能量管理策略", 《电力自动化设备》 *
毕锐等: "孤立微网多元储能与柴油发电机协调控制策略", 《电力系统自动化》 *
陈沧海等: "基于小微企业需求响应的园区能量优化管理方法", 《浙江电力》 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117833429A (en) * 2024-01-09 2024-04-05 清安储能技术(重庆)有限公司 Coordinated control method and system for light storage and charge system for delaying battery aging

Also Published As

Publication number Publication date
CN111864805B (en) 2021-11-09

Similar Documents

Publication Publication Date Title
CN106709610B (en) Micro-grid electricity energy storage and ice storage combined optimization scheduling method
CN106230007B (en) A kind of micro-capacitance sensor energy storage Optimization Scheduling
CN109103939B (en) Intelligent control device and method for energy storage system for reducing loss of photovoltaic power station
Bao et al. Battery charge and discharge control for energy management in EV and utility integration
CN108123497B (en) Power distribution cabinet for AC/DC hybrid power supply and AC/DC hybrid power supply system
CN107181273B (en) Electrified railway power generation and supply device and control method thereof
CN104919675A (en) Power control device, power control method, program, and energy management system
CN113612260A (en) Electric-hydrogen island direct current micro-grid operation control method
CN110112783A (en) Photovoltaic storage battery micro-capacitance sensor dispatch control method
CN111231728B (en) Photovoltaic energy storage charging and discharging integrated energy control system and method
CN113555590B (en) Multi-fuel cell module power generation system and control method thereof
CN103545907A (en) Office photovoltaic direct-current power supply system and control method
CN105471075A (en) Photovoltaic charging unit of electric vehicle
CN112491045A (en) Intelligent household light storage and energy charging interconnection system and energy efficiency management method thereof
CN105958498A (en) Electric-vehicle-considered unit commitment and time-of-use power price joint optimization method
CN107092975B (en) AC-DC hybrid micro-grid economic optimization method based on energy storage loss integral
CN114997544A (en) Method and system for optimizing and configuring capacity of hydrogen optical storage charging station
CN111231713A (en) Electric automobile charging and discharging system and control method
CN111864805B (en) Energy management method of industrial park micro-grid light storage combined power generation device
CN208835762U (en) A kind of energy storage for power supply system applied to base station
CN218021224U (en) Photovoltaic system of new energy vehicle
CN113541133B (en) Fine scheduling method for hybrid micro-grid
CN115099489A (en) Industrial and commercial energy storage system capacity configuration method based on optimal economic measurement and calculation
CN107359636A (en) A kind of charging system
CN115049431A (en) Pricing method of water and electricity in electric power spot market

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant