CN105846419A - Photovoltaic and diesel complementary power supply system based on DC microgrid - Google Patents
Photovoltaic and diesel complementary power supply system based on DC microgrid Download PDFInfo
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- CN105846419A CN105846419A CN201610339316.2A CN201610339316A CN105846419A CN 105846419 A CN105846419 A CN 105846419A CN 201610339316 A CN201610339316 A CN 201610339316A CN 105846419 A CN105846419 A CN 105846419A
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
-
- 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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/14—Balancing the load in a network
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
-
- 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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
- H02J1/106—Parallel operation of dc sources for load balancing, symmetrisation, or sharing
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a photovoltaic and diesel complementary power supply system based on a DC microgrid. The system comprises a photovoltaic power generation module, a first unidirectional isolated DC/DC converter, a DC bus and a load, which are connected in sequence. The first unidirectional isolated DC/DC converter is controlled by an MPPT controller. The system also comprises a storage battery module, a diesel generator module and an energy management system. The energy management system collects work states of all devices through the bus, and sends a scheduling instruction under a preset operation mode. The system can realize the purposes of optimizing operation of a power supply system, improving power generating income, prolonging device service life and enhancing power supply reliability and the like.
Description
Technical field
The invention belongs to generating and power supply controls technical field, be specifically related to a kind of photovoltaic based on direct-current grid, diesel oil complementary power supply system.
Background technology
Along with increasingly sharpening of energy crisis and environmental problem, countries in the world all focus more on the development of new forms of energy.In recent years, power electronics controls the development of the generation of electricity by new energy technology such as technology and photovoltaic, maturation, and with wind energy and solar energy, the distributed new generating permeability as representative constantly raises, and the electrical problem of large quantities of areas without electricity the most thus has been resolved.
In the prior art, during solar powered or wind-photovoltaic complementary power supply system, diesel engine are powered, electrical power storage is in battery, owing to the direct carry of battery is on dc bus, and battery is to be utilized effectively, its output voltage has bigger fluctuation, busbar voltage or load voltage may be caused unstable, in some instances it may even be possible to the phenomenon that load cannot normally work occur.In order to ensure the stable power-supplying of output loading, battery tension can only fluctuate in the least scope, and the very high capacity that effectively utilizes of battery reduces.Energy distribution between battery and load is not easy to realize independent control, and accumulator cell charging and discharging is uncontrolled, and the life of storage battery shortens.
Micro-grid system based on exchange framework, can continue to use original alternating current equipment, such as distribution line and power switch etc. and compatible with AC load, protection device relative maturity.But, most of new forms of energy distributed power generation unit, energy storage device and increasing load use direct current.Therefore according to direct-current micro-grid framework, extra DC/AC unsteady flow link can be saved, simple in construction and in hgher efficiency, it is often more important that control strategy more flexibly, reliable.
Summary of the invention
The technical problem to be solved in the present invention is: provide a kind of photovoltaic based on direct-current grid, diesel oil complementary power supply system, it is achieved direct current micro-grid system optimization runs.
The present invention solves that the technical scheme that above-mentioned technical problem is taked is: a kind of photovoltaic based on direct-current grid, diesel oil complementary power supply system, it includes photovoltaic generating module, the first unidirectional isolation DC/DC converter, dc bus and the load being sequentially connected with, the first described unidirectional isolation DC/DC converter is by MPPT controller control, it is characterised in that: it also includes battery module, diesel-driven generator module and EMS；
Described battery module includes battery, two-way isolation DC/DC converter and charging-discharging controller, battery accesses dc bus by double isolation DC/DC converters, and charging-discharging controller is for gathering the state parameter of battery and controlling two-way isolation DC/DC converter；
Described diesel-driven generator module includes being sequentially connected with and finally access the diesel-driven generator of dc bus, rectification circuit and second unidirectional isolation DC/DC converter；
Described EMS is connected by bus isolation unidirectional with described first DC/DC converter, MPPT controller, charging-discharging controller, the second unidirectional isolation DC/DC converter and diesel-driven generator respectively, for collecting the duty of all devices in bus, under default operational mode, issue dispatch command.
By said system, the described operational mode preset includes:
The operational mode that pattern 1, photovoltaic generation are taken as the leading factor:
When the power output of photovoltaic generating module is more than the need for electricity loaded and the summation of battery absorption maximum power, control photovoltaic generating module and depart from MPPT state, and limit the power output of photovoltaic generating module equal to the need for electricity loaded and the summation of battery absorption maximum power, powering load, charge to battery simultaneously, until battery is full of, now control photovoltaic generating module and depart from MPPT state, and the power output limiting photovoltaic generating module is equal to the need for electricity of load, powering load also makes battery be in floating charge state；
Pattern 2: the operational mode that battery is taken as the leading factor:
Pattern 2-1: when the power output of photovoltaic generating module is more than the need for electricity loaded, and less than the need for electricity loaded and the summation of battery absorption maximum power, control photovoltaic generating module and be operated in MPPT pattern, powering load, charge a battery simultaneously；
Pattern 2-2: when the power output of photovoltaic generating module is less than the need for electricity loaded, and the power output summation of the power output of photovoltaic generating module and battery is more than or equal to the need for electricity of load, now control photovoltaic generating module and be operated in MPPT pattern, and battery powers to the load；
Pattern 3: the operational mode that diesel engine is taken as the leading factor:
When the power output of photovoltaic generating module and the power output summation of battery are less than the need for electricity of load, now controlling photovoltaic generating module and be operated in MPPT pattern, battery powers to the load, and starts diesel-driven generator generating；
When remaining battery capacity be minimum of a value cannot discharge time, cut off the connection of battery and dc bus.
By said system, described photovoltaic power supply module includes the photovoltaic array of serial or parallel connection.
The invention have the benefit that the present invention uses the structure of direct-current grid, utilize two-way isolation DC/DC converter, it is possible to the charge and discharge process of battery is independently controlled, extend the service life of battery, maintain stablizing of busbar voltage, it is ensured that the stable power-supplying of output loading；The method that EMS uses dc bus to control, the bilayer of energy management controls to this complementary power supply system, it is achieved the optimization of electric power system runs, improves gene-ration revenue, extension device life-span, strengthens the targets such as power supply reliability.
Accompanying drawing explanation
Fig. 1 is the system architecture schematic diagram of one embodiment of the invention.
Fig. 2 is three kinds of operational mode switching schematic diagrames of one embodiment of the invention.
Detailed description of the invention
Below in conjunction with instantiation and accompanying drawing, the present invention will be further described.
The present invention provides a kind of photovoltaic based on direct-current grid, diesel oil complementary power supply system, as shown in Figure 1, it includes photovoltaic generating module, the first unidirectional isolation DC/DC converter, dc bus and the load being sequentially connected with, the first described unidirectional isolation DC/DC converter is by MPPT controller control, and it also includes battery module, diesel-driven generator module and EMS；Described battery module includes battery, two-way isolation DC/DC converter and charging-discharging controller, battery accesses dc bus by double isolation DC/DC converters, and charging-discharging controller is for gathering the state parameter of battery and controlling two-way isolation DC/DC converter；Described diesel-driven generator module includes being sequentially connected with and finally access the diesel-driven generator of dc bus, rectification circuit and second unidirectional isolation DC/DC converter；Described EMS is connected by bus isolation unidirectional with described first DC/DC converter, MPPT controller, charging-discharging controller, the second unidirectional isolation DC/DC converter and diesel-driven generator respectively, for collecting the duty of all devices in bus, under default operational mode, issue dispatch command.
If EESFor battery current remaining capacity；EES_MINAnd EES_MAXIt is respectively accumulator capacity lower limit and the upper limit；PPV_O、PDE_OIt is respectively photovoltaic generating module, the power output of diesel-driven generator；PES_OAnd PES_IIt is respectively battery power output and absorbed power；PLFor the power required for load.
The described operational mode preset includes:
The operational mode that pattern 1, photovoltaic generation are taken as the leading factor:
When the power output of photovoltaic generating module is more than the need for electricity loaded and summation (the i.e. P of battery absorption maximum powerPV_O >PES_I
+PL), control photovoltaic generating module and depart from MPPT state, and limit the power output of photovoltaic generating module equal to the need for electricity loaded and summation (the i.e. P of battery absorption maximum powerPV_O = PES_I+PL), powering load, charges to battery, until battery is full of (i.e. E simultaneouslyES =EES_MAX), now control photovoltaic generating module and depart from MPPT state, and limit power output need for electricity (the i.e. P equal to load of photovoltaic generating modulePV_O =PL), powering load also makes battery be in floating charge state；
Pattern 2: the operational mode that battery is taken as the leading factor:
Pattern 2-1: when the power output of photovoltaic generating module is more than need for electricity (the i.e. P loadedPV_O > PL), and less than the need for electricity loaded and summation (the i.e. P of battery absorption maximum powerPV_O <PES_I
+PL), control photovoltaic generating module and be operated in MPPT pattern, powering load, charge a battery simultaneously；
Pattern 2-2: when the power output of photovoltaic generating module is less than the need for electricity loaded, and the power output summation of the power output of photovoltaic generating module and battery is more than or equal to need for electricity (the i.e. P of loadPV_O +PES_O
>=PL), now control photovoltaic generating module and be operated in MPPT pattern, and battery powers to the load；
Pattern 3: the operational mode that diesel engine is taken as the leading factor:
When the power output of photovoltaic generating module and the power output summation of battery are less than need for electricity (the i.e. P loadedPV_O +PES_O
<PL), now controlling photovoltaic generating module and be operated in MPPT pattern, battery powers to the load, and starts diesel-driven generator generating, i.e. PPV_O +PES_O +PDE_O=PL；
When remaining battery capacity be minimum of a value cannot discharge time (EES =EES_MIN), cut off the connection of battery and dc bus.Under normal circumstances, after needing photovoltaic generating module suitably to charge a battery, then excise the connection of battery and dc bus, and keep diesel-driven generator to generate electricity, make PPV_O +PDE_O=PL。
Further, described photovoltaic power supply module includes the photovoltaic array of serial or parallel connection.
Three models realizes switching according to the voltage of dc bus, thus controls stablizing of DC bus-bar voltage, here it is DC bus-bar voltage controls.
Simultaneously, EMS controls to take the whole situation into account, owing to the first unidirectional isolation DC/DC converter and MPPT controller, two-way isolation DC/DC converter and charging-discharging controller thereof, the second unidirectional isolation DC/DC converter etc. are connected to EMS by bus, they had both played the effect controlling conversion, were reported the running state parameter of oneself that affiliated part again to EMS by bus.The global optimization that EMS can realize photovoltaic by top-down resolution arbitration mechanism, diesel oil complementation is powered controls.Dispatch command, each unit in adjustment system is issued, it is possible to achieve the system level functions such as the management of photovoltaic generation maximum energy capture, battery dump energy, subelement cut out, system monitoring and protection by communication bus.
It is the variation of the voltage according to dc bus that Three models switches freely with each other, sets VHThe maximum of variation, V is allowed for DC bus-bar voltageLThe minimum of a value of variation, V is allowed for busbar voltageM For the standard value of DC bus-bar voltage, VT Current detection value for DC bus-bar voltage.
As in figure 2 it is shown, when electric power system is operated in pattern 2 times, under ideal zero circle state, battery neither power output the most not absorbed power.When photovoltaic generation power output declines suddenly, battery power output suddenly increases, until it reaches not continuing to after its peak power output increase power output, electric power system is operated in pattern 2-2.If now the power output summation of photovoltaic generating module and battery still cannot meet load power demand in system, causing busbar voltage to begin to decline, diesel-driven generator starts as load supplying, maintenance electric power system busbar voltage VT > VL, system is progressively switched to pattern 3 by pattern 2.If now its electricity of exhaustion of the accumulators, then busbar voltage can decline further, diesel-driven generator increases power output to maintain power-balance, until after photovoltaic generation recovers original state, electric power system can be changed to pattern 2 by pattern 3, it is similar that this process is progressively switched to pattern 3 with pattern 2, repeats no more.
When electric power system operates in pattern 2, busbar voltage is controlled at V by batteryT = VM, now photovoltaic generation is operated in MPPT state.When photovoltaic generation power output increases suddenly, battery absorbed power suddenly increases, until it reaches not continuing to after its absorption maximum power increase absorbed power, electric power system is operated in pattern 2-1.Now system still has surplus power to absorb, and causes busbar voltage to start to raise, and system is progressively switched to pattern 1 by pattern 2, and photovoltaic generation departs from MPPT state, limits power output, control bus voltage VT <VH.Until after photovoltaic generation recovers original state, electric power system can be changed to pattern 2 by pattern 1, and it is similar that this process is progressively switched to pattern 1 with pattern 2, repeats no more.
Control based on DC bus-bar voltage ensures that electric power system realizes freely switching three kinds of different operational modes so that electric power system is able to maintain that stablizing of DC bus-bar voltage, and load can normally work；The use of two-way DC/DC converter, allows the discharge and recharge of battery be achieved independent control, extends the service life of battery greatly.
EMS is taken the whole situation into account, and is connected by bus and solar energy power generating unidirectional isolation DC/DC converter and controller, battery two-way isolation DC/DC converter and charging-discharging controller thereof, diesel generation unidirectional isolation DC/DC inverter and controller etc. thereof.Each converter transmits the running state parameter of part belonging to oneself by bus to EMS.So, EMS is according to the running status of various piece and parameter, by top-down resolution arbitration mechanism, utilizes certain rule that controls to control the orderly function of various piece, it is possible to achieve the global optimization that photovoltaic, diesel oil complementation are powered controls.Dispatch command, each unit in adjustment system is issued, it is possible to achieve the system level functions such as the management of photovoltaic generation maximum energy capture, battery dump energy, subelement cut out, system monitoring and protection by communication bus.
Above example is merely to illustrate design philosophy and the feature of the present invention, its object is to make those skilled in the art will appreciate that present disclosure and implement according to this, and protection scope of the present invention is not limited to above-described embodiment.So, all equivalent variations made according to disclosed principle, mentality of designing or modification, all within protection scope of the present invention.
Claims (3)
1. a photovoltaic based on direct-current grid, diesel oil complementary power supply system, it includes photovoltaic generating module, the first unidirectional isolation DC/DC converter, dc bus and the load being sequentially connected with, the first described unidirectional isolation DC/DC converter is by MPPT controller control, it is characterised in that: it also includes battery module, diesel-driven generator module and EMS；
Described battery module includes battery, two-way isolation DC/DC converter and charging-discharging controller, battery accesses dc bus by double isolation DC/DC converters, and charging-discharging controller is for gathering the state parameter of battery and controlling two-way isolation DC/DC converter；
Described diesel-driven generator module includes being sequentially connected with and finally access the diesel-driven generator of dc bus, rectification circuit and second unidirectional isolation DC/DC converter；
Described EMS is connected by bus isolation unidirectional with described first DC/DC converter, MPPT controller, charging-discharging controller, the second unidirectional isolation DC/DC converter and diesel-driven generator respectively, for collecting the duty of all devices in bus, under default operational mode, issue dispatch command.
Photovoltaic based on direct-current grid the most according to claim 1, diesel oil complementary power supply system, it is characterised in that: the described operational mode preset includes:
The operational mode that pattern 1, photovoltaic generation are taken as the leading factor:
When the power output of photovoltaic generating module is more than the need for electricity loaded and the summation of battery absorption maximum power, control photovoltaic generating module and depart from MPPT state, and limit the power output of photovoltaic generating module equal to the need for electricity loaded and the summation of battery absorption maximum power, powering load, charge to battery simultaneously, until battery is full of, now control photovoltaic generating module and depart from MPPT state, and the power output limiting photovoltaic generating module is equal to the need for electricity of load, powering load also makes battery be in floating charge state；
Pattern 2: the operational mode that battery is taken as the leading factor:
Pattern 2-1: when the power output of photovoltaic generating module is more than the need for electricity loaded, and less than the need for electricity loaded and the summation of battery absorption maximum power, control photovoltaic generating module and be operated in MPPT pattern, powering load, charge a battery simultaneously；
Pattern 2-2: when the power output of photovoltaic generating module is less than the need for electricity loaded, and the power output summation of the power output of photovoltaic generating module and battery is more than or equal to the need for electricity of load, now control photovoltaic generating module and be operated in MPPT pattern, and battery powers to the load；
Pattern 3: the operational mode that diesel engine is taken as the leading factor:
When the power output of photovoltaic generating module and the power output summation of battery are less than the need for electricity of load, now controlling photovoltaic generating module and be operated in MPPT pattern, battery powers to the load, and starts diesel-driven generator generating；
When remaining battery capacity be minimum of a value cannot discharge time, cut off the connection of battery and dc bus.
Photovoltaic based on direct-current grid the most according to claim 1, diesel oil complementary power supply system, it is characterised in that: described photovoltaic power supply module includes the photovoltaic array of serial or parallel connection.
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| CN106849343A (en) * | 2017-01-23 | 2017-06-13 | 武汉理工大学 | The communication base station independently-powered switching system of wind-solar-diesel storage and power switching method |
| CN107231002A (en) * | 2017-08-03 | 2017-10-03 | 深圳市海云图新能源有限公司 | A kind of mixed type microgrid electrification energy storage system |
| CN108390409A (en) * | 2018-03-01 | 2018-08-10 | 北京林业大学 | The forest zone microgrid energy management control method of biomass energy and solar energy complementation |
| CN110165690A (en) * | 2019-05-23 | 2019-08-23 | 南京国电南自新能源工程技术有限公司 | Multi-energy complementary micro-grid system based on reversed coordinated regulation |
| CN111313397A (en) * | 2020-03-24 | 2020-06-19 | 北京双登慧峰聚能科技有限公司 | Energy control system and control method for communication base station hybrid power supply system |
| CN111541305A (en) * | 2020-05-01 | 2020-08-14 | 河南龙翔电力研究院股份有限公司 | Micro-grid platform based on data detection system |
| CN112290668A (en) * | 2020-11-06 | 2021-01-29 | 宇能电气有限公司 | Open-air portable hybrid power source power supply system |
| CN112952981A (en) * | 2021-02-07 | 2021-06-11 | 重庆润电科技有限公司 | Oil-electricity hybrid mobile power supply system and working method thereof |
| WO2021189659A1 (en) * | 2020-03-24 | 2021-09-30 | 北京双登慧峰聚能科技有限公司 | Energy control system and control method for hybrid power supply system of communication base station |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849343A (en) * | 2017-01-23 | 2017-06-13 | 武汉理工大学 | The communication base station independently-powered switching system of wind-solar-diesel storage and power switching method |
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| CN107231002A (en) * | 2017-08-03 | 2017-10-03 | 深圳市海云图新能源有限公司 | A kind of mixed type microgrid electrification energy storage system |
| CN108390409A (en) * | 2018-03-01 | 2018-08-10 | 北京林业大学 | The forest zone microgrid energy management control method of biomass energy and solar energy complementation |
| CN108390409B (en) * | 2018-03-01 | 2020-12-15 | 北京林业大学 | Forest micro-grid energy management control method with complementation of biomass energy and solar energy |
| CN110165690A (en) * | 2019-05-23 | 2019-08-23 | 南京国电南自新能源工程技术有限公司 | Multi-energy complementary micro-grid system based on reversed coordinated regulation |
| CN111313397A (en) * | 2020-03-24 | 2020-06-19 | 北京双登慧峰聚能科技有限公司 | Energy control system and control method for communication base station hybrid power supply system |
| WO2021189659A1 (en) * | 2020-03-24 | 2021-09-30 | 北京双登慧峰聚能科技有限公司 | Energy control system and control method for hybrid power supply system of communication base station |
| CN111313397B (en) * | 2020-03-24 | 2022-03-22 | 北京双登慧峰聚能科技有限公司 | Energy control system and control method for communication base station hybrid power supply system |
| CN111541305A (en) * | 2020-05-01 | 2020-08-14 | 河南龙翔电力研究院股份有限公司 | Micro-grid platform based on data detection system |
| CN112290668A (en) * | 2020-11-06 | 2021-01-29 | 宇能电气有限公司 | Open-air portable hybrid power source power supply system |
| CN112952981A (en) * | 2021-02-07 | 2021-06-11 | 重庆润电科技有限公司 | Oil-electricity hybrid mobile power supply system and working method thereof |
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