CN106655257B - The Energy Management System and method of harbour bank electricity based on new energy hybrid power supply - Google Patents
The Energy Management System and method of harbour bank electricity based on new energy hybrid power supply Download PDFInfo
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- CN106655257B CN106655257B CN201611005947.7A CN201611005947A CN106655257B CN 106655257 B CN106655257 B CN 106655257B CN 201611005947 A CN201611005947 A CN 201611005947A CN 106655257 B CN106655257 B CN 106655257B
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 230000005611 electricity Effects 0.000 title abstract description 9
- 238000004146 energy storage Methods 0.000 claims abstract description 174
- 238000010248 power generation Methods 0.000 claims abstract description 55
- 238000007726 management method Methods 0.000 claims description 65
- 239000003990 capacitor Substances 0.000 claims description 43
- 238000007599 discharging Methods 0.000 claims description 18
- 230000005540 biological transmission Effects 0.000 claims description 8
- 238000013459 approach Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
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Classifications
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- H02J3/383—
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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
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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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- H02J3/386—
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention discloses the Energy Management System and method of a kind of harbour bank electricity based on new energy hybrid power supply, and the Energy Management System includes: bus, and the voltage on bus flows into load；Photovoltaic power generation apparatus, the electric energy for converting solar energy are sent to bus；Power distribution network, for obtaining electric energy to bus conveying electric energy, or by bus；Battery energy storage device is used for bus discharge, or passes through busbar charging；And capacitive energy storage device, it is used for bus discharge, or pass through busbar charging.The present invention is based in the Energy Management System of the harbour bank electricity of new energy hybrid power supply by the way that photovoltaic power generation apparatus, wind power generation plant, power distribution network, battery energy storage device and capacitive energy storage device are connect with bus respectively, to realize making full use of to the energy of a variety of different approaches, and then ensure the stability of voltage on bus.
Description
Technical Field
The invention relates to the technical field of power supply, in particular to a new energy hybrid power supply-based harbor shore power energy management system and method.
Background
At present, in the existing shore power system, a power supply generally reduces the voltage of the high voltage of a power distribution network through a port transformer substation, and then the high voltage is connected to a wharf shore power box after being subjected to voltage regulation and frequency modulation through a frequency converter. However, the power supply mode has a single electric energy source, and the problem of insufficient capacity of a power distribution network is often encountered during transformation, and renewable energy cannot be fully utilized, thereby causing energy waste.
Disclosure of Invention
The invention aims to provide a port shore power energy management system based on new energy hybrid power supply, which can fully utilize energy sources in different ways.
In order to achieve the purpose, the invention provides the following scheme:
an energy management system of port shore power based on new energy hybrid power supply, the energy management system comprising:
a bus connected to a load, a voltage on the bus flowing into the load;
the photovoltaic power generation device is connected with the bus and used for transmitting electric energy converted from solar energy to the bus;
the wind power generation device is connected with the bus and is used for transmitting the electric energy converted from wind energy to the bus;
the power distribution network is connected with the bus and used for transmitting electric energy to the bus or acquiring the electric energy through the bus;
the battery energy storage device is connected with the bus and used for discharging electricity to the bus or charging through the bus; and
and the capacitive energy storage device is connected with the bus and used for discharging electricity to the bus or charging through the bus.
Optionally, the bus is a dc bus.
Optionally, the load includes a direct current load and/or an alternating current load; wherein,
the energy management system further comprises:
the load inverter is arranged between the direct current bus and the alternating current load, and is used for converting direct current voltage on the direct current bus into alternating current voltage and transmitting the alternating current voltage to the alternating current load;
the wind power inverter is arranged between the wind power generation device and the direct current bus and used for converting alternating current voltage generated by the wind power generation device into direct current voltage and transmitting the direct current voltage to the direct current bus;
the power distribution inverter is arranged between the direct current bus and the power distribution network, and is used for converting alternating current voltage output in the power distribution network into direct current voltage and transmitting the direct current voltage to the direct current bus; or converting the direct-current voltage on the direct-current bus into alternating-current voltage and transmitting the alternating-current voltage to the power distribution network.
Optionally, the energy management system further includes:
and the photovoltaic converter is arranged between the photovoltaic power generation device and the direct current bus and is used for adjusting the direct current voltage transmitted to the direct current bus by the photovoltaic power generation device.
Optionally, the energy management system further includes:
the battery energy storage converter is arranged between the battery energy storage device and the direct current bus and used for adjusting direct current voltage transmitted from the battery energy storage device to the direct current bus so as to realize the discharge of the battery energy storage device to the direct current bus; or adjusting the direct current voltage transmitted to the battery energy storage device by the direct current bus so as to charge the battery energy storage device through the direct current bus.
Optionally, the energy management system further includes:
the capacitive energy storage converter is arranged between the capacitive energy storage device and the direct current bus and used for adjusting the direct current voltage transmitted to the direct current bus by the capacitive energy storage converter so as to realize the discharge of the capacitive energy storage device to the direct current bus; or adjusting the direct current voltage transmitted to the capacitive energy storage device by the direct current bus so as to charge the capacitive energy storage device through the direct current bus.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
according to the harbour shore power energy management system based on new energy hybrid power supply, the photovoltaic power generation device, the wind power generation device, the power distribution network, the battery energy storage device and the capacitor energy storage device are respectively connected with the bus, so that energy sources in different ways are fully utilized, and the stability of voltage on the bus is further ensured.
The invention aims to provide a new energy hybrid power supply-based harbor shore power energy management method, which can fully utilize energy sources in different ways and optimally control each energy source so as to improve the stability of power utilization of users.
In order to achieve the purpose, the invention provides the following scheme:
an energy management method of the energy management system based on the port shore power of the new energy hybrid power supply comprises the following steps:
detecting the output power P of a photovoltaic power generation device in the energy management system of the port shore power based on the new energy hybrid power supplyPVOutput power P of wind power generation deviceWTOutput power variation delta P of battery energy storage devicebatOutput power variation delta P of capacitive energy storage deviceSCAnd the current voltage U on the bus;
according to the output power P of the photovoltaic power generation devicePVOutput power P of wind power generation deviceWTOutput power variation delta P of battery energy storage devicebatOutput of capacitive energy storage devicePower variation Δ PSCAnd the current voltage U on the bus adjusts the working mode of the energy management system of the port shore power based on the new energy hybrid power supply, and controls the charging and discharging of the battery energy storage device and the capacitor energy storage device and the electric energy transmission between the power distribution network and the bus.
Optionally, the method for controlling charging and discharging of the battery energy storage device and the capacitor energy storage device and electric energy transmission between the power distribution network and the bus includes:
when (P)WT+PPV)+△Pbat≥Pload≥PWT+PPVOr (1-a) UR≤U<URWhen the battery energy storage device is in the discharge mode, the energy management system works in the mode 1 and controls the battery energy storage device to work in the discharge mode;
when P is presentWT+PPV≥Pload≥(PWT+PPV)-△PbatOr UR<U≤(1+a)URWhen the battery energy storage device is in the charging mode, the energy management system works in the mode 2 and controls the battery energy storage device to work in the charging mode;
when (P)WT+PPV)+△Pbat+△PSC≥Pload≥(PWT+PPV)+△PbatOr (1-b) UR≤U<(1-a)URWhen the energy management system works in the mode 3, the battery energy storage device and the capacitor energy storage device are controlled to work in a discharging mode simultaneously; when the battery energy storage device and the capacitor energy storage device are lower than set values, the grid is connected to obtain electric energy from the power distribution network, and the battery energy storage device and the capacitor energy storage device are charged at the same time;
when (P)WT+PPV)-△Pbat≥Pload≥(PWT+PPV)-△Pbat-△PSCOr (1+ a) UR<U≤(1+b)URWhen the energy management system works in the mode 4, the battery energy storage device and the capacitor energy storage device are controlled to work in a charging mode; when the battery energy storage device and the capacitor energy storage device are fully charged, the grid is connected to transmit electric energy to the power distribution network;
when P is presentload≥(PWT+PPV)+△Pbat+△PSCWhen, or when U<(1-b)URWhen the energy management system works in the mode 5, the grid is connected to obtain electric energy from the power distribution network, and meanwhile, the battery energy storage device and the capacitor energy storage device are charged;
when (P)WT+PPV)-△Pbat-△PSC≥PloadOr (1+ b) UR<When the U time is up, the energy management system works in a mode 6 and is connected to the grid to transmit electric energy to the power distribution network;
wherein, URIs rated voltage, PloadFor the load power demand, a and b are the respective voltage error rates.
Optionally, a is 3% and b is 5%.
Optionally, the bus is a dc bus.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
according to the port shore power energy management method based on new energy hybrid power supply, the photovoltaic power generation device, the wind power generation device, the power distribution network, the battery energy storage device and the capacitor energy storage device are respectively connected with the bus, so that energy sources in different ways are fully utilized, and the stability of voltage on the bus is further ensured; furthermore, according to the output power P of the photovoltaic power generation device acquired in real timePVOutput power P of wind power generation deviceWTOutput power variation delta P of battery energy storage devicebatOutput power variation delta P of capacitive energy storage deviceSCAnd the current voltage U on the bus controls the working condition of each energy device, so that the dependence on a power distribution network can be effectively reduced, the reliability of power supply can be improved, and the effects of saving energy, reducing emission and reducing pollutant emission can be achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of a port shore power energy management system based on new energy hybrid power supply;
fig. 2 is a flow chart of the energy management method of the port shore power based on new energy hybrid power supply.
Description of the symbols:
bus 1 photovoltaic power generation device 2
Photovoltaic converter 21 wind power generation device 3
Wind power inverter 31 distribution network 4
Distribution inverter 41 battery energy storage device 5
Battery energy storage converter 51 capacitive energy storage device 6
DC load 7 of capacitor energy storage converter 61
The ac load 8 loads the inverter 81.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a new energy hybrid power supply-based harbor shore power energy management system, which is characterized in that a photovoltaic power generation device, a wind power generation device, a power distribution network, a battery energy storage device and a capacitor energy storage device are respectively connected with a bus, so that energy sources in different ways are fully utilized, and the stability of voltage on the bus is further ensured.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1, the energy management system for the port shore power based on the new energy hybrid power supply of the invention includes a bus 1, a photovoltaic power generation device 2, a wind power generation device 3, a power distribution network 4, a battery energy storage device 5 and a capacitor energy storage device 6. Wherein the bus bar 1 is connected to a load, and the voltage on the bus bar 1 flows into the load; the photovoltaic power generation device 2 is connected with the bus 1 and is used for transmitting electric energy converted from solar energy to the bus 1; the wind power generation device 3 is connected with the bus 1 and is used for transmitting the electric energy converted from wind energy to the bus 1; the power distribution network 4 is connected with the bus 1 and used for transmitting electric energy to the bus 1 or acquiring electric energy through the bus 1; the battery energy storage device 5 is connected with the bus 1 and is used for discharging electricity to the bus 1 or charging electricity through the bus 1; the capacitive energy storage device 6 is connected with the bus 1 and used for discharging electricity to the bus 1 or charging electricity through the bus 1.
Wherein the bus 1 is a direct current bus. The load comprises a dc load 7 and/or an ac load 8 (as shown in fig. 1).
Further, the energy management system of the port shore power based on the new energy hybrid power supply further comprises: load inverter 81, wind power inverter 31, and distribution inverter 41; the load inverter 81 is arranged between the direct current bus and the alternating current load 8, and is used for converting a direct current voltage on the direct current bus into an alternating current voltage and transmitting the alternating current voltage to the alternating current load 8; the wind power inverter is arranged between the wind power generation device 3 and the direct current bus, and is used for converting alternating current voltage generated by the wind power generation device 3 into direct current voltage and transmitting the direct current voltage to the direct current bus; the distribution inverter 41 is arranged between the direct current bus and the distribution network 4, and is used for converting alternating current voltage output by the distribution network 4 into direct current voltage and transmitting the direct current voltage to the direct current bus; or, the dc voltage on the dc bus is converted into an ac voltage and transmitted to the distribution network 4. In the present embodiment, the load inverter 91, the wind power inverter 31 and the distribution inverter 41 may be DC/AC inverters, respectively.
In addition, the energy management system of the port shore power based on new energy hybrid power supply further comprises a photovoltaic converter 21, wherein the photovoltaic converter 21 is arranged between the photovoltaic power generation device 2 and the direct current bus and used for adjusting the direct current voltage transmitted to the direct current bus by the photovoltaic power generation device.
Further, the energy management system for the port shore power based on the new energy hybrid power supply further includes a battery energy storage converter 51, where the battery energy storage converter 51 is disposed between the battery energy storage device 5 and the dc bus, and is configured to adjust a dc voltage transmitted from the battery energy storage device 5 to the dc bus, so as to discharge the battery energy storage device 5 to the dc bus; or adjusting the direct current voltage transmitted to the battery energy storage device 5 by the direct current bus, so as to charge the battery energy storage device 5 through the direct current bus. In this embodiment, the battery energy storage converter 51 is a lithium battery.
Optionally, the energy management system for the port shore power based on the new energy hybrid power supply further includes a capacitive energy storage converter 61, where the capacitive energy storage converter 61 is disposed between the capacitive energy storage device 6 and the dc bus, and is configured to adjust a dc voltage transmitted by the capacitive energy storage converter 7 to the dc bus, so as to enable the capacitive energy storage device to discharge to the dc bus; or adjusting the direct current voltage transmitted to the capacitive energy storage device by the direct current bus so as to charge the capacitive energy storage device through the direct current bus. In this embodiment, the capacitive energy storage converter 61 is a super capacitor.
In the present invention, by providing at least one of the photovoltaic converter 21, the battery energy storage converter 51, and the capacitor energy storage converter 61, the dc voltage can be effectively adjusted, and the fixed dc voltage is converted into the variable dc voltage and transmitted to the dc bus, thereby ensuring the stability of the voltage on the dc bus and the balance of the system power. In the present embodiment, the photovoltaic converter 21, the battery energy storage converter 51 and the capacitor energy storage converter 61 may be DC/DC converters, respectively.
The direct current bus is connected with the power distribution network through a Point of Common Coupling (PCC), and energy can be transmitted between the direct current bus and the power distribution network. For a photovoltaic power generation device, the photovoltaic power generation device is connected to a direct current bus through a photovoltaic converter, and a Maximum Power Point Tracking (MPPT) control method capable of fully utilizing solar energy is selected according to actual operation requirements. The wind power generation device is connected to the direct current bus through the controllable rectifier inverter, and MPPT control can be adopted according to wind speed change. And each energy storage element of the hybrid energy storage component consisting of the battery energy storage device and the capacitor energy storage device is respectively connected with the direct current bus through the bidirectional DC/DC converter, so that the voltage stability of the direct current bus and the system power in a balanced state are ensured. During system operation, the load may be selectively unloaded based on the load importance level to maintain system power balance.
In addition, the invention also provides a port shore power energy management method based on new energy hybrid power supply, and the photovoltaic power generation device, the wind power generation device, the power distribution network, the battery energy storage device and the capacitor energy storage device are respectively connected with the bus, so that the energy sources in different ways are fully utilized, and the stability of the voltage on the bus is further ensured; furthermore, according to the output power P of the photovoltaic power generation device acquired in real timePVOutput power P of wind power generation deviceWTOutput power variation delta P of battery energy storage devicebatOutput power variation delta P of capacitive energy storage deviceSCAnd the current voltage U on the bus controls the working condition of each energy device, so that the dependence on a power distribution network can be effectively reduced, the reliability of power supply can be improved, and the effects of saving energy, reducing emission and reducing pollutant emission can be achieved.
As shown in fig. 2, the energy management method of the port shore power based on the new energy hybrid power supply of the present invention includes:
step 100: detecting the output power P of a photovoltaic power generation device in the energy management system of the port shore power based on the new energy hybrid power supplyPVOutput power P of wind power generation deviceWTOutput power variation delta P of battery energy storage devicebatOutput power of capacitor energy storage device is changedChemical quantity delta PSCAnd the current voltage U on the bus;
step 200: according to the output power P of the photovoltaic power generation devicePVOutput power P of wind power generation deviceWTOutput power variation delta P of battery energy storage devicebatOutput power variation delta P of capacitive energy storage deviceSCAnd the current voltage U on the bus adjusts the working mode of the energy management system of the port shore power based on the new energy hybrid power supply, and controls the charging and discharging of the battery energy storage device and the capacitor energy storage device and the electric energy transmission between the power distribution network and the bus. Further, the bus is a direct current bus.
As shown in table 1, in step 200, the method for controlling charging and discharging of the battery energy storage device and the capacitive energy storage device and power transmission between the power distribution network and the bus includes:
(1) when (P)WT+PPV)+△Pbat≥Pload≥PWT+PPVOr (1-a) UR≤U<URWhen the battery energy storage device is in the discharge mode, the energy management system works in the mode 1 and controls the battery energy storage device to work in the discharge mode;
(2) when P is presentWT+PPV≥Pload≥(PWT+PPV)-△PbatOr UR<U≤(1+a)URWhen the battery energy storage device is in the charging mode, the energy management system works in the mode 2 and controls the battery energy storage device to work in the charging mode;
(3) when (P)WT+PPV)+△Pbat+△PSC≥Pload≥(PWT+PPV)+△PbatOr (1-b) UR≤U<(1-a)URWhen the energy management system works in the mode 3, the battery energy storage device and the capacitor energy storage device are controlled to work in a discharging mode simultaneously; when the battery energy storage device and the capacitor energy storage device are lower than set values, the grid is connected to obtain electric energy from the power distribution network, and the battery energy storage device and the capacitor energy storage device are charged at the same time;
(4) when (P)WT+PPV)-△Pbat≥Pload≥(PWT+PPV)-△Pbat-△PSCOr (1+ a) UR<U≤(1+b)URWhen the energy management system works in the mode 4, the battery energy storage device and the capacitor energy storage device are controlled to work in a charging mode; when the battery energy storage device and the capacitor energy storage device are fully charged, the grid is connected to transmit electric energy to the power distribution network;
(5) when P is presentload≥(PWT+PPV)+△Pbat+△PSCWhen, or when U<(1-b)URWhen the energy management system works in the mode 5, the grid is connected to obtain electric energy from the power distribution network, and meanwhile, the battery energy storage device and the capacitor energy storage device are charged;
(6) when (P)WT+PPV)-△Pbat-△PSC≥PloadOr (1+ b) UR<When the U time is up, the energy management system works in a mode 6 and is connected to the grid to transmit electric energy to the power distribution network;
wherein, URIs rated voltage, PloadFor the power demanded by the load, a and b are the voltage error rates, and in this embodiment, a is 3% and b is 5%, but not limited thereto.
TABLE 1
According to the port shore power energy management method based on new energy hybrid power supply, the stability of power supply to a load can be ensured by introducing various renewable energy sources for power generation and energy storage of the hybrid energy storage component; by reasonably regulating and controlling the working conditions of all energy sources, the dependence on a large power grid is reduced, the stability and reliability of power supply are further improved, and the effects of saving energy, reducing emission and reducing pollutant emission are achieved.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (4)
1. An energy management system of port shore power based on new energy hybrid power supply, characterized in that the energy management system comprises:
the direct current bus is connected with a load, and the voltage on the direct current bus flows into the load;
the photovoltaic power generation device is connected with the direct current bus and used for transmitting electric energy converted from solar energy to the direct current bus;
the wind power generation device is connected with the direct current bus and is used for transmitting the electric energy converted from wind energy to the direct current bus;
the power distribution network is connected with the direct current bus and used for transmitting electric energy to the direct current bus or acquiring the electric energy through the direct current bus;
the battery energy storage device is connected with the direct current bus and is used for discharging to the direct current bus or charging through the direct current bus; and
the capacitive energy storage device is connected with the direct current bus and is used for discharging to the direct current bus or charging through the direct current bus;
the method comprises the steps that at least one of a photovoltaic converter, a battery energy storage converter and a capacitor energy storage converter is arranged to adjust direct-current voltage, the fixed direct-current voltage is converted into variable direct-current voltage, the variable direct-current voltage is transmitted to a direct-current bus, and the stability of the voltage on the direct-current bus and the balance of system power are guaranteed;
the photovoltaic converter is arranged between the photovoltaic power generation device and the direct current bus and used for adjusting direct current voltage transmitted to the direct current bus by the photovoltaic power generation device;
the battery energy storage converter is arranged between the battery energy storage device and the direct current bus and used for adjusting direct current voltage transmitted from the battery energy storage device to the direct current bus so as to realize discharge of the battery energy storage device to the direct current bus; or adjusting the direct current voltage transmitted to the battery energy storage device by the direct current bus so as to charge the battery energy storage device through the direct current bus;
the capacitive energy storage converter is arranged between the capacitive energy storage device and the direct current bus and used for adjusting the direct current voltage transmitted to the direct current bus by the capacitive energy storage converter so as to realize the discharge of the capacitive energy storage device to the direct current bus; or adjusting the direct current voltage transmitted to the capacitive energy storage device by the direct current bus so as to charge the capacitive energy storage device through the direct current bus;
according to the output power P of the photovoltaic power generation devicePVOutput power P of wind power generation deviceWTOutput power variation delta P of battery energy storage devicebatOutput power variation delta P of capacitive energy storage deviceSCThe current voltage U on the direct-current bus adjusts the working mode of the energy management system of the port shore power based on the new energy hybrid power supply, and controls the charging and discharging of the battery energy storage device and the capacitor energy storage device and the electric energy transmission between the power distribution network and the direct-current bus;
the method for controlling the charging and discharging of the battery energy storage device and the capacitor energy storage device and the electric energy transmission between the power distribution network and the direct current bus comprises the following steps:
when (P)WT+PPV)+△Pbat≥Pload≥PWT+PPVOr (1-a) UR≤U<URWhen the battery energy storage device is in the discharge mode, the energy management system works in the mode 1 and controls the battery energy storage device to work in the discharge mode;
when P is presentWT+PPV≥Pload≥(PWT+PPV)-△PbatOr UR<U≤(1+a)URWhen the battery energy storage device is in the charging mode, the energy management system works in the mode 2 and controls the battery energy storage device to work in the charging mode;
when (P)WT+PPV)+△Pbat+△PSC≥Pload≥(PWT+PPV)+△PbatOr (1-b) UR≤U<(1-a)URWhen the energy management system works in the mode 3, the battery energy storage device and the capacitor energy storage device are controlled to work in a discharging mode simultaneously; when the battery energy storage device and the capacitor energy storage device are lower than set values, the grid is connected to obtain electric energy from the power distribution network, and the battery energy storage device and the capacitor energy storage device are charged at the same time;
when (P)WT+PPV)-△Pbat≥Pload≥(PWT+PPV)-△Pbat-△PSCOr (1+ a) UR<U≤(1+b)URWhen the energy management system works in the mode 4, the battery energy storage device and the capacitor energy storage device are controlled to work in a charging mode; when the battery energy storage device and the capacitor energy storage device are fully charged, the grid is connected to transmit electric energy to the power distribution network;
when P is presentload≥(PWT+PPV)+△Pbat+△PSCWhen, or when U<(1-b)URWhen the energy management system works in the mode 5, the grid is connected to obtain electric energy from the power distribution network, and meanwhile, the battery energy storage device and the capacitor energy storage device are charged;
when (P)WT+PPV)-△Pbat-△PSC≥PloadOr (1+ b) UR<When the U time is up, the energy management system works in a mode 6 and is connected to the grid to transmit electric energy to the power distribution network;
wherein, URIs rated voltage, PloadFor the load power demand, a and b are the respective voltage error rates.
2. The energy management system for the port shore power based on the hybrid power supply of new energy sources according to claim 1, wherein the load comprises a direct current load and/or an alternating current load; wherein,
the energy management system further comprises:
the load inverter is arranged between the direct current bus and the alternating current load, and is used for converting direct current voltage on the direct current bus into alternating current voltage and transmitting the alternating current voltage to the alternating current load;
the wind power inverter is arranged between the wind power generation device and the direct current bus and used for converting alternating current voltage generated by the wind power generation device into direct current voltage and transmitting the direct current voltage to the direct current bus;
the power distribution inverter is arranged between the direct current bus and the power distribution network, and is used for converting alternating current voltage output in the power distribution network into direct current voltage and transmitting the direct current voltage to the direct current bus; or converting the direct-current voltage on the direct-current bus into alternating-current voltage and transmitting the alternating-current voltage to the power distribution network.
3. An energy management method using the new energy hybrid power supply based harbor shore power energy management system according to any one of claims 1 to 2, characterized in that the energy management method comprises:
detecting the output power P of a photovoltaic power generation device in the energy management system of the port shore power based on the new energy hybrid power supplyPVOutput power P of wind power generation deviceWTOutput power variation delta P of battery energy storage devicebatOutput power variation delta P of capacitive energy storage deviceSCAnd the current voltage U on the dc bus;
according to the output power P of the photovoltaic power generation devicePVOutput power P of wind power generation deviceWTOutput power variation delta P of battery energy storage devicebatOutput power variation delta P of capacitive energy storage deviceSCThe current voltage U on the direct-current bus adjusts the working mode of the energy management system of the port shore power based on the new energy hybrid power supply, and controls the charging and discharging of the battery energy storage device and the capacitor energy storage device and the electric energy transmission between the power distribution network and the direct-current bus;
the method for controlling the charging and discharging of the battery energy storage device and the capacitor energy storage device and the electric energy transmission between the power distribution network and the direct current bus comprises the following steps:
when (P)WT+PPV)+△Pbat≥Pload≥PWT+PPVOr (1-a) UR≤U<URWhen the battery energy storage device is in the discharge mode, the energy management system works in the mode 1 and controls the battery energy storage device to work in the discharge mode;
when P is presentWT+PPV≥Pload≥(PWT+PPV)-△PbatOr UR<U≤(1+a)URWhen the battery energy storage device is in the charging mode, the energy management system works in the mode 2 and controls the battery energy storage device to work in the charging mode;
when (P)WT+PPV)+△Pbat+△PSC≥Pload≥(PWT+PPV)+△PbatOr (1-b) UR≤U<(1-a)URWhen the energy management system works in the mode 3, the battery energy storage device and the capacitor energy storage device are controlled to work in a discharging mode simultaneously; when the battery energy storage device and the capacitor energy storage device are lower than set values, the grid is connected to obtain electric energy from the power distribution network, and the battery energy storage device and the capacitor energy storage device are charged at the same time;
when (P)WT+PPV)-△Pbat≥Pload≥(PWT+PPV)-△Pbat-△PSCOr (1+ a) UR<U≤(1+b)URWhen the energy management system works in the mode 4, the battery energy storage device and the capacitor energy storage device are controlled to work in a charging mode; when the battery energy storage device and the capacitor energy storage device are fully charged, the grid is connected to transmit electric energy to the power distribution network;
when P is presentload≥(PWT+PPV)+△Pbat+△PSCWhen, or when U<(1-b)URWhen the energy management system works in the mode 5, the grid is connected to obtain electric energy from the power distribution network, and meanwhile, the battery energy storage device and the capacitor energy storage device are charged;
when (P)WT+PPV)-△Pbat-△PSC≥PloadOr (1+ b) UR<U hours, the energy management system worksIn mode 6, the grid is connected to deliver electric energy to the distribution network;
wherein, URIs rated voltage, PloadFor the load power demand, a and b are the respective voltage error rates.
4. The energy management method of the harbour shore power energy management system based on the new energy hybrid power supply as claimed in claim 3, wherein a is 3% and b is 5%.
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