CN105811393A - Load curve-based direct-current microgrid energy management method - Google Patents
Load curve-based direct-current microgrid energy management method Download PDFInfo
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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
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- H02J1/14—Balancing the load in a network
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Abstract
The invention discloses a load curve-based direct-current microgrid energy management method. A direct-current microgrid system comprises at least one power generating unit and load, and a direct-current bus distribution line disposed between the power generating units and the loads. The direct-current microgrid energy management method comprises the following steps: 1, running a photovoltaic power generating system and a wind power generating system in a direct-current microgrid at their full load as fully as possible, and enabling the direct-current microgrid to respond to maximum load condition with full power; 2, acquiring load condition information, recording load condition of each moment, and drawing a load curve of predicting property; 3, adjusting power output in the direct-current microgrid, and enabling output of the photovoltaic power generating system and wind power generating system to be in a suitable power generating range; 4, adjusting an energy-storage daily load curve: charging and discharging with an energy storage system, i.e., energy-storage DC/DC, and the power usage demand is met. The balance in power and quantity in a direct-current system can be guaranteed, and the life of the energy storage system can be prolonged.
Description
Technical field
The present invention relates to the direct-current micro-grid field based on generation of electricity by new energy, be a kind of reasonable charging/discharging thereof of direct-current micro-grid energy-storage system according to load curve, be specifically related to a kind of direct-current micro-grid energy management method based on load curve.
Background technology
In microgrid, usually adopting solar energy, wind energy, the energy storage distributed energy to generate electricity as power supply, in these electricity generation systems, solar electrical energy generation and energy storage are directly to produce direct current energy.
In conventional electric power system, the leading position of AC network is formed, but for the micro-grid system based on generation of electricity by new energy, direct-current micro-grid is without considering the problems such as frequency stable, Reactive-power control, A.C.power loss, the equipment such as conveniently accessible new forms of energy, electric automobile, can be used for the occasion such as data center, residential quarters, direct-current micro-grid incorporates all kinds of micro-source and energy-storage system, it is easily achieved the mutual supplement with each other's advantages between micro-source and cooperation, reduce the distributed power generation impact on operation of power networks, thus improving the quality of power supply.
Direct-current micro-grid will be more satisfactory scheme.
Compared with exchange microgrid, having the advantages of of direct-current micro-grid:
1) inverter utilization rate can be improved, reduce cost and reduce loss, due to Wind turbines, to reach time of rated power output relatively fewer, and the multiple stage Wind turbines full probability sent out simultaneously is then lower, thus the separate inverter unit utilization rate of each micro battery in exchange microgrid, energy-storage travelling wave tube is relatively low.By concentrating inverter to replace separate inverter unit in direct-current micro-grid, it is effectively reduced quantity and the capacity of electronic power convertor.
2) it is prone between each micro battery coordinate control, by controlling the power-balance that stably can realize micro battery and load of DC bus-bar voltage.
3) direct current network effective power flow is easily controlled, and is conducive to the integration of each new forms of energy power supply in microgrid, reduces and major network is affected.
4) direct-current micro-grid is absent from frequency and the problem such as power-angle stability, reactive circular power flow.
5) networking current transformer can be effectively isolated AC network disturbance, and as organic whole, major network provides certain dynamic support using microgrid.
nullChinese patent notification number CN102916481B，Authorized announcement date 2015.08.26，Disclose a kind of direct current micro-grid system and energy management method thereof，Generator unit includes user side bulk power grid and grid-connected AC/DC thereof、LiFePO4 energy-storage system and energy storage DC/DC thereof，And photovoltaic generating system and photovoltaic DC/DC thereof，It is provided with EMS EMS and with grid-connected、Energy storage sets up, with photovoltaic DC/DC, the radio sensing network communicated，EMS performs different control strategies，Optimize direct-current micro-grid to run，Including be incorporated into the power networks be switched to islet operation time，DC bus-bar voltage outer shroud is adopted by grid-connected AC/DC、The control mode stable DC busbar voltage of outputting inductance current inner loop，It is switched within the time of at most 20ms and is namely adopted DC bus-bar voltage outer shroud by energy storage DC/DC with voltage source form、It is stable that the control mode of energy-storage battery side inductive current internal ring maintains DC bus-bar voltage，Reach the requirement of seamless switching，Realize teledata central concentrated load uninterrupted power supply，And reactive-load compensation equipment need not be reconfigured at.
Chinese Patent Application No. 201310119015.5; a kind of direct current micro-grid system and control method thereof; the present invention relates to a kind of direct current micro-grid system and control method thereof; direct current micro-grid system includes DC power distribution line, two-way AC/DC rectification/inverter, distributed energy TRT, energy storage device, DC load, AC load, city microclimate interactive system, clock interactive system, micro-network control system and microgrid protection device; micro-network control system is provided with upper strata dispatching management information system, forms the multi-zone supervision of microgrid energy.Direct current micro-grid system control method enters grid-connect mode or island mode according to the duty of bulk power grid, and the information according to city microclimate interactive system, clock interactive system determines energy storage device and the duty of distributed energy TRT.The present invention can independently to alternating current-direct current load supplying, again can according to the result of city microclimate interactive information and network grid-connected power, meet customer power supply demand and reduce cost, be conducive to the design of microgrid, control, operation, maintenance, be effectively improved microgrid power supply reliability, economical and high efficiency.
Having obvious intermittence owing to being distributed the source especially power supply such as photovoltaic, wind-powered electricity generation that declines, therefore energy-storage system is most important to the adjustment effect of bus power.
Existing direct-current micro-grid is general lack of effective control, and single use switching power supply reaches a range of electric energy control, and energy-storage system discharge and recharge is be adjusted according to microgrid state and control mostly, and then guarantees that system power balances.When system running state changes, all needing correspondingly to put into or excision energy-storage system, energy-storage system is repeatedly repeatedly performed discharge and recharge, in some instances it may even be possible to super-charge super-discharge phenomenon occur, and this all will be greatly shortened the energy storage device life-span.
Summary of the invention
For the deficiency overcoming above-mentioned prior art to exist, the present invention provides a kind of direct-current micro-grid energy management method based on load curve, can with straight-flow system load curve for foundation, control the discharge and recharge of energy-storage system scientifically and rationally, both can ensure that the balance of electric power and ener of straight-flow system, the life-span of energy storage device can have been extended again simultaneously.
The technical scheme of the technical problem to be solved in the present invention is:
A kind of direct-current micro-grid energy management method based on load curve, described direct current micro-grid system, including at least one generator unit, load, and it is arranged on the dc bus distribution line between generator unit and load, described generator unit includes: the wind-powered electricity generation DC/DC and wind-powered electricity generation DC/DC of wind generator system and employing Buck-Boost topological structure thereof, and the photovoltaic DC/DC and photovoltaic DC/DC of photovoltaic generating system and employing Buck-Boost topological structure thereof, user side bulk power grid and the grid-connected two-way exchange of bridge-type/DC converter AC/DC and grid-connected AC/DC thereof, energy-storage system and energy storage DC/DC, described load includes analog DC load and data central concentrated load, described direct-current micro-grid energy management method comprises the steps:
The first step: photovoltaic generating system and wind generator system in direct-current micro-grid are as far as possible completely sent out, allows whole direct-current micro-grid first tackle the situation of peak load with full power；
Second step: gather load status information:
In order to tackle load change and photovoltaic generating system and wind generator system it cannot be guaranteed that expire situation about sending out, record the loading condition in each moment, the load curve drawn out with prediction character is contrasted by the matching of the record of a period of time and data, next day possible load change situation of this load curve forecasting, and this load curve is with regulating nargin, but the electricity consumption level of every day generally that's about the size of it；
3rd step: the power supply regulated in direct-current micro-grid is exerted oneself, owing to electricity consumption can not be all full state, therefore, photovoltaic generating system and exerting oneself of wind generator system can be allowed to reach a suitable generation range, owing to photovoltaic generating system and wind generator system are not fully controllable, it is possible to allow photovoltaic generating system and wind generator system and user side bulk power grid comprehensively exert oneself and fix on a suitable some position；
4th step: the daily load curve of energy storage regulates:
Under stable premise of comprehensively exerting oneself, the process of concrete peak regulation is completed by energy storage device, because photovoltaic generating system and wind generator system and user side bulk power grid are close to the plotted line tending to straight line of an a little fluctuation, so the variation of load is dependent on energy-storage system and the charge and discharge process of energy storage DC/DC, when load level is far below load curve, so energy-storage system and energy storage DC/DC are charged, when load level is higher than load curve, energy-storage system and energy storage DC/DC discharge, and meet electricity consumption needs.
Preferably, described photovoltaic generating system is operated in MPPT pattern when sending power less than loading demand, switches to constant voltage mode when photovoltaic generating system sends power more than loading demand, it is prevented that DC bus-bar voltage is too high.
Preferably, at 0-5 hour, load level is charged far below load curve, energy-storage system and energy storage DC/DC.
Preferably, when 16-22 point, load level is higher than load curve, and energy-storage system and energy storage DC/DC discharge.
Preferably, the discharge and recharge switching point of described energy storage DC/DC allows there is ± the deviation of 3-10% on load curve basis.
The excellent effect of the present invention:
The load curve drawn out with prediction character is contrasted by the matching of the record of a period of time and data, next day possible load change situation of this load curve forecasting, and this load curve is with regulating nargin, but the electricity consumption level of every day generally that's about the size of it；The present invention is with straight-flow system load curve for foundation, control the discharge and recharge of energy-storage system scientifically and rationally, carry out the discharge and recharge of regulation energy-storage system according to this curve, more economically fast, can ensure that the balance of electric power and ener of straight-flow system, and can reach to extend the purpose in energy-storage system life-span.
Under the promotion of the problem such as energy scarcity and environmental conservation, direct-current micro-grid, with its obvious advantage, has vast potential for future development.Meanwhile, the present invention can make the energy-storage system life-span in direct-current micro-grid be greatly prolonged, and has very strong practicality and novelty.
Accompanying drawing explanation
Accompanying drawing described herein, in order to provide a further understanding of the present invention, constitutes the part of the present patent application, and the schematic description and description of the present invention is used for explaining the present invention, is not intended that inappropriate limitation of the present invention.
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is certain residential quarter straight-flow system daily load curve figure；
Fig. 2 is the direct-current microgrid energy management system flow chart based on load curve.
Detailed description of the invention
The technology contents of the present invention is described below by way of particular specific embodiment, and the content that those skilled in the art can be disclosed by this specification understands further advantage and effect of the present invention easily.The present invention also can pass through other different specific embodiment and be implemented or apply, and the every details in this specification also based on different viewpoints and application, can carry out various modification and change under the spirit of the present invention.
Below in conjunction with accompanying drawing 1,2, the present invention is further detailed explanation.
Wherein, load curve be describe a period of time internal loading in time (by hour in units of) curve that changes, the rule of reflection a period of time internal loading time to time change.Its Main Function is: electric power system dispatching department is used for arranging generation schedule.Traffic department to develop the load curve of release's day every day, in order to arranges the plan of exerting oneself of each generating department accordingly.Power system planning authorities is for carrying out the balance of electric power and ener of power system and determining the method for operation (such as peak, pressure regulation and Reactive Compensation Mode etc.) and carry out safety analysis.
The invention discloses a kind of direct-current micro-grid energy management method based on load curve, described direct current micro-grid system, including at least one generator unit, load, and it is arranged on the dc bus distribution line between generator unit and load, described generator unit includes: the wind-powered electricity generation DC/DC and wind-powered electricity generation DC/DC of wind generator system and employing Buck-Boost topological structure thereof, and the photovoltaic DC/DC and photovoltaic DC/DC of photovoltaic generating system and employing Buck-Boost topological structure thereof, user side bulk power grid and the grid-connected two-way exchange of bridge-type/DC converter AC/DC and grid-connected AC/DC thereof, energy-storage system and energy storage DC/DC, described load includes analog DC load and data central concentrated load, described direct-current micro-grid energy management method comprises the steps:
The first step: photovoltaic generating system and wind generator system in direct-current micro-grid are as far as possible completely sent out, allows whole direct-current micro-grid first tackle the situation of peak load with full power.
First the load of lower direct-current micro-grid and the practical situation of power supply are talked about: first load change is the random (access of load and to exit be carry out according to the mode of the actual social production electricity consumption of people, therefore it is variation), second photovoltaic generating system and wind generator system are due to self undulatory property and randomness, produce electricity to change along with the change of environment and (exert oneself as solar energy changes along with illumination, blower fan adjusts accordingly also with wind speed), so whole direct-current micro-grid is power supply or load is all randomness, but clean energy resource is controlled in certain scope, such as photovoltaic carries out the tracking of illumination according to MPPT form, can plan that photovoltaic exports as the average of photovoltaic in the force that goes out that selection one in overall range of exerting oneself is suitable, wind-powered electricity generation is similar；Therefore, the first step of direct-current micro-grid allows clean energy resource full as far as possible (all reaching perfect condition) allow whole direct-current micro-grid elder generation full power to tackle the situation of peak load exactly.
Second step: gather load status information:
In order to tackle load change and photovoltaic generating system and wind generator system it cannot be guaranteed that expire situation about sending out, record the loading condition in each moment, the load curve drawn out with prediction character is contrasted by the matching of the record of a period of time and data, next day possible load change situation of this load curve forecasting, and this load curve is with regulating nargin, but the electricity consumption level of every day generally that's about the size of it.
nullCompletely oestrus under condition in direct-current micro-grid，Consider load change and weather condition (cloudy day、Wind speed is little)，Record the loading condition (such as a day 24 hours in each moment，Each hour/half an hour records load condition) this process needs certain time，Purpose is contemplated to gather load status information，The load change of every day is likely to not quite alike，But the load change trend of every day is probably, and much the same (such as 7-8 in morning point load is only small，14-20 point load sharply increases，Cross 22 point loads to reduce again)，Contrast, by the matching of the record of a period of time and data, the load curve finally drawn out with predicting character and (monte carlo modelling method can be used、Basic probability statistics can also)，Next day possible load change situation of this load curve forecasting，And this load curve is with regulating nargin，But that's about the size of it for the electricity consumption level of every day generally.
3rd step: the power supply regulated in direct-current micro-grid is exerted oneself, owing to electricity consumption can not be all full state, therefore, photovoltaic generating system and exerting oneself of wind generator system can be allowed to reach a suitable generation range, owing to photovoltaic generating system and wind generator system are not fully controllable, it is possible to allow photovoltaic generating system and wind generator system and user side bulk power grid comprehensively exert oneself and fix on a suitable some position.
Owing to electricity consumption can not be all full state, therefore, exerting oneself of clean energy resource can be allowed to reach a suitable generation range, owing to clean energy resource is not fully controllable (tunes up completely turning down exerts oneself be impossible), clean energy resource and voltage stabilizing infinity power supply can be allowed comprehensively to exert oneself a suitable some position, this is exerted oneself and is equivalent to the average level of load curve state, and this scope is to have the floating of little scope certainly.
4th step: the daily load curve of energy storage regulates:
Under stable premise of comprehensively exerting oneself, the process of concrete peak regulation is completed by energy storage device, because photovoltaic generating system and wind generator system and user side bulk power grid are close to the plotted line tending to straight line of an a little fluctuation, so the variation of load is dependent on energy-storage system and the charge and discharge process of energy storage DC/DC, when load level is far below load curve, so energy-storage system and energy storage DC/DC are charged, when load level is higher than load curve, energy-storage system and energy storage DC/DC discharge, and meet electricity consumption needs.Preferably, the discharge and recharge switching point of described energy storage DC/DC allows there is ± the deviation of 3-10% on load curve basis.
Under stable premise of comprehensively exerting oneself, the process of concrete peak regulation is completed by energy storage device, because unidirectional clean energy resource is comprehensively exerted oneself close to the plotted line tending to straight line of an a little fluctuation with infinitely great DC source, so the variation of load is dependent on the charge and discharge process of energy storage device, such as 0-5 hour load level is far below synthetic load curve, then energy-storage system and energy storage DC/DC carry out energy storage charging.When 16-22 point, load level is higher than load curve, and energy-storage system and energy storage DC/DC discharge, and meet electricity consumption needs.This process regulates realization by the planning of energy storage, directly can be controlled the charge and discharge of energy storage by computer.
Energy-storage system for the present invention includes accumulator, super capacitor etc..In present pre-ferred embodiments, it is assumed that it is the meansigma methods of total capacity requirement that residential quarter direct-current micro-grid is in generated energy during steady statue, whole system allows ± error of 3-5%.
Under normal circumstances load change can measure in the middle of operation steady in a long-term and measurable go out its peak valley rule, one section of region internal loading Fluctuation is called load curve by department of State Grid, and allocates electric energy according to its curve and reach region stable electric power in advance.In direct-current micro-grid still there is certain rule in load, first conventional power source and various clean energy resourcies are allowed to reach full hair-like state and record system internal loading operation conditions, gathering and include in computer, after a period of time, computer mould draws up the reference frame as one's respective area load condition of the straight-flow system load curve.Last conventional power source and clean energy resource will be exerted oneself and be reached average load level, and energy storage device becomes the main adjustment energy of crest and trough.Energy-storage system is according to load curve in a planned way discharge and recharge, it is to avoid it, according to straight-flow system real-time status constantly discharge and recharge, reaches the purpose of protection energy storage device.
Wherein, straight-flow system load curve in residential quarter can pass through the prediction of the method such as multiple correlation algorithm, time series method and Harmonic Decomposition method and obtains.The present invention applies measured load curve to arrange the discharge and recharge plan of energy-storage system, thus ensure that the balance of electric power and ener of residential quarter straight-flow system.Energy-storage system is not instantaneous compensate electric energy according to the continuous discharge and recharge of load change, but completely in accordance with the rule of load curve, more in a planned way carries out discharge and recharge, and this can be greatly prolonged the life-span of energy storage device.
Preferably, described photovoltaic generating system is operated in MPPT pattern when sending power less than loading demand, switches to constant voltage mode when photovoltaic generating system sends power more than loading demand, it is prevented that DC bus-bar voltage is too high.
It is illustrated in figure 1 certain residential quarter straight-flow system load chart, this load curve has distinguishing feature: daytime, entire change ratio was shallower, night (18:00 to 20:00) is load peak, and night is substantially reduced after 00:00, and morning, about 04:00 slowly rose again.
In sum, the rule that the present invention changes according to direct-current micro-grid load curve, carry out the charge and discharge control of energy storage device scientifically and rationally.Carry out the macro adjustments and controls of energy-storage system discharge and recharge according to load curve so that the discharge and recharge of energy-storage system is more planned arrangement, reach to extend the purpose in energy storage device life-span.
Compared with prior art, in the present invention, the discharge and recharge of energy-storage system is more planned, is possible not only to ensure the stable operation of direct current micro-grid system, it is also possible to be greatly prolonged the life-span of energy-storage system.Under the promotion of the problem such as energy scarcity and environmental conservation, direct-current micro-grid, with its obvious advantage, has vast potential for future development.Meanwhile, the present invention can make the energy-storage system life-span in direct-current micro-grid be greatly prolonged, and has very strong practicality and novelty.
Above-described embodiment is illustrative principles of the invention and effect thereof only, not for the restriction present invention.Above-described embodiment all under the spirit and category of the present invention, can carried out modifying and change by any those skilled in the art.Therefore, the scope of the present invention, should as listed by claims.
Claims (5)
1. the direct-current micro-grid energy management method based on load curve, it is characterised in that:
Described direct current micro-grid system, including at least one generator unit, load, and is arranged on the dc bus distribution line between generator unit and load,
Described generator unit includes: wind generator system and adopt the wind-powered electricity generation DC/DC and wind-powered electricity generation DC/DC of Buck-Boost topological structure and photovoltaic generating system and the photovoltaic DC/DC and photovoltaic DC/DC of employing Buck-Boost topological structure, user side bulk power grid and the grid-connected two-way exchange of bridge-type/DC converter AC/DC and grid-connected AC/DC, energy-storage system and energy storage DC/DC, described load includes analog DC load and data central concentrated load
Described direct-current micro-grid energy management method comprises the steps:
The first step: photovoltaic generating system and wind generator system in direct-current micro-grid are as far as possible completely sent out, allows whole direct-current micro-grid first tackle the situation of peak load with full power；
Second step: gather load status information:
In order to tackle load change and photovoltaic generating system and wind generator system it cannot be guaranteed that expire situation about sending out, record the loading condition in each moment, the load curve drawn out with prediction character is contrasted by the matching of the record of a period of time and data, next day possible load change situation of this load curve forecasting, and this load curve is with regulating nargin, but the electricity consumption level of every day generally that's about the size of it；
3rd step: the power supply regulated in direct-current micro-grid is exerted oneself, owing to electricity consumption can not be all full state, therefore, photovoltaic generating system and exerting oneself of wind generator system can be allowed to reach a suitable generation range, owing to photovoltaic generating system and wind generator system are not fully controllable, it is possible to allow photovoltaic generating system and wind generator system and user side bulk power grid comprehensively exert oneself and fix on a suitable some position；
4th step: the daily load curve of energy storage regulates:
Under stable premise of comprehensively exerting oneself, the process of concrete peak regulation is completed by energy storage device, because photovoltaic generating system and wind generator system and user side bulk power grid are close to the plotted line tending to straight line of an a little fluctuation, so the variation of load is dependent on energy-storage system and the charge and discharge process of energy storage DC/DC, when load level is far below load curve, so energy-storage system and energy storage DC/DC are charged, when load level is higher than load curve, energy-storage system and energy storage DC/DC discharge, and meet electricity consumption needs.
2. a kind of direct-current micro-grid energy management method based on load curve according to claim 1, it is characterised in that:
Described photovoltaic generating system is operated in MPPT pattern when sending power less than loading demand, switches to constant voltage mode when photovoltaic generating system sends power more than loading demand, it is prevented that DC bus-bar voltage is too high.
3. a kind of direct-current micro-grid energy management method based on load curve according to claim 1, it is characterised in that:
At 0-5 hour, load level was charged far below load curve, energy-storage system and energy storage DC/DC.
4. a kind of direct-current micro-grid energy management method based on load curve according to claim 1, it is characterised in that:
When 16-22 point, load level is higher than load curve, and energy-storage system and energy storage DC/DC discharge.
5. a kind of direct-current micro-grid energy management method based on load curve according to claim 1, it is characterised in that:
The discharge and recharge switching point of described energy storage DC/DC allows to have on load curve basis ± deviation of 3-10%.
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| CN109742777A (en) * | 2019-03-04 | 2019-05-10 | 曹麾 | Low-voltage platform area peak load balance intelligence control subsystem |
| CN110912117A (en) * | 2018-09-18 | 2020-03-24 | 电力规划总院有限公司 | Power balance calculation method and device |
| CN113629773A (en) * | 2021-09-09 | 2021-11-09 | 南方电网科学研究院有限责任公司 | Wind power generation system and power generation method thereof |
| CN115102199A (en) * | 2022-06-24 | 2022-09-23 | 江苏为恒智能科技有限公司 | Photovoltaic energy storage capacity measuring and calculating method for realizing zero carbon emission of household power |
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| CN102427249A (en) * | 2011-12-19 | 2012-04-25 | 天津市电力公司 | Method and system for controlling distributed micro-grid parallel operation |
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| CN110912117A (en) * | 2018-09-18 | 2020-03-24 | 电力规划总院有限公司 | Power balance calculation method and device |
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| CN113629773A (en) * | 2021-09-09 | 2021-11-09 | 南方电网科学研究院有限责任公司 | Wind power generation system and power generation method thereof |
| CN115102199A (en) * | 2022-06-24 | 2022-09-23 | 江苏为恒智能科技有限公司 | Photovoltaic energy storage capacity measuring and calculating method for realizing zero carbon emission of household power |
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Application publication date: 20160727 |