CN109159715A - A kind of V2G microgrid energy control method considering economic optimization - Google Patents
A kind of V2G microgrid energy control method considering economic optimization Download PDFInfo
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Abstract
The invention discloses a kind of V2G microgrid energy control methods for considering economic optimization to judge its power rating by the online collection to generated output and load consuming power；By the judgement of different system requirements, judge whether electric car needs to participate in energy scheduling；By quantifying the benefit of electric car energy-storage battery, in conjunction with local Spot Price compared with, judge the degree of participation of electric car；And then the scheduling optimized based on economy is carried out to system capacity.The present invention can carry out corresponding energy scheduling to V2G micro-grid system and optimize under the premise of guaranteeing system reliability to its economy, to obtain better economic benefit.
Description
Technical field
The present invention relates to a kind of V2G microgrid energy control methods for considering economic optimization, belong to the monitoring of microgrid photovoltaic system
Technical field.
Background technique
Micro-grid system refers to by power generator, energy storage device, energy conversion device, associated loadings and monitoring, protective device
Small-sized electric system made of collecting, being one can be realized self-contr ol, protection and the autonomous system of management, both can be with
External electrical network is incorporated into the power networks, and can also be the important component of smart grid with isolated operation.In recent years, with energy problem
And environmental problem becomes increasingly conspicuous, microgrid has received widespread attention as the big main means for alleviating Pressure on Energy.
Vehicle net interconnection technique (V2G) refers to using electric car energy-storage battery as a part of microgrid energy storage, participates in microgrid
The technology of energy scheduling.In recent years, with the continuous maturation of electric vehicle engineering, the vehicle net based on electric car energy storage interconnects skill
Art is widely applied in micro-capacitance sensor, and V2G technology can effectively improve the power quality of power grid, reduces system when peak
Load.
Although V2G technology can active balance energy fluctuation, improve the reliability of system.But the introducing of V2G technology,
Improve the cost of system.How to make micro-grid system while guaranteeing the reliability of its power supply, takes into account the warp of V2G system operation
Ji cost is current critical issue to be solved.
Summary of the invention
The technical problem to be solved by the present invention is to overcoming the deficiencies of existing technologies, provides and a kind of consider economic optimization
V2G microgrid energy control method, collects generated output and load consuming power online, carries out to different system requirements
Setting, quantifies the benefit of electric car energy-storage battery, compared with combining with local time-of-use tariffs, proposes based on economy
The energy management strategies of optimization.
The technical solution adopted in the present invention is as follows:
A kind of V2G microgrid energy control method considering economic optimization, including the following steps:
1) the power generation general power and load consuming power for the module that real-time collecting micro-grid system is included, be denoted as respectively P with
Pload；
2) differentiate P and PloadRelationship, if P >=Pload, then it is transferred to step 3)；If P < Pload, then it is transferred to step 6)；
3) SOC value for measuring electric car internal motivation battery at this time, is denoted as SOC*；Compare SOC*With SOCmaxRelationship,
If SOC*≥SOCmax, then it is transferred to step 4)；If SOC*< SOCmax, then it is transferred to step 5)；Wherein, SOCmaxRefer to power battery
Maximum SOC value；
4) excrescent electric power is generated electricity by way of merging two or more grid systems, until no longer meeting SOC*≥SOCmax, wherein excrescent electric power P1=P-
Pload；
5) excrescent electric power charges to the power battery of electric car, until no longer meeting SOC*< SOCmax；
6) SOC value for measuring electric car internal motivation battery at this time, is denoted as SOC*；Compare SOC*With SOCminRelationship,
If SOC*≤SOCmin, then it is transferred to step 7)；If SOC*> SOCmin, then step 8) is carried out；The SOCminRefer to that power battery is tieed up
Hold the minimum SOC value of performance requirement；
7) electric car is not involved in energy scheduling, and power grid gives load to energize together with micro-grid system, until no longer meeting
SOC*≤SOCmin；
8) institute's energy bring economic benefit when quantization uses power battery as power source, note benefit are f1；Obtain this
The Spot Price at moment, is denoted as f2, then it is transferred to step 9)；
9), compare f1With f2, relationship, if f1> f2, then it is transferred to step 7)；If f1≤f2, then it is transferred to step 10)；
10) maximum power that power battery can be output when not influencing its cycle life is chosen, P is denoted asb, compare P, Pb
With PloadRelationship；If P+Pb≥Pload, then adjust and enable its output power PsFor Ps=Pload- P, is transferred to step 11)；If P+Pb
< Pload, then it is transferred to step 12)；
11) electric car participates in energy scheduling, and electric automobile power battery gives load to energize together with micro-grid system；
12) electric car participates in energy scheduling, and electric automobile power battery, power grid give load to supply together with micro-grid system
Energy.
SOC in aforementioned step 3) and step 6)*It is measured by open circuit voltage method.
SOC in aforementioned step 3)maxNo more than 80%.
SOC in aforementioned step 6)minIt chooses as follows:
(SOCmin-SOC0)*CN≥Ws
Wherein, SOC0Permitted SOC minimum value under cycle life optimal conditions, C are considered for power batteryNFor power electric
The capacity in pond, WsEnergy needed for travelling daily operating range for electric car with rated power.
W above-mentionedsCalculating it is as follows:
Wherein, PDFor the rated output power of motor in electric automobile, s is the operating range of electric car, and v is electric car
Average speed within this distance.
In aforementioned step 8), f1Calculating it is as follows:
f1=s1+s2
Wherein, s1Fuel cost consumed by daily operating range, s are travelled for general-utility car2For carbon transaction bring emission reduction warp
Ji benefit.
Compared with prior art, the beneficial effects of the present invention are:
1, of the invention by the online collection to generated output and load consuming power, and to different system requirements
Determine, judge whether electric car needs to participate in energy scheduling, ensure that the reliability of system, improve the flexibility of system.
2, the present invention has quantified the economic benefit of energy-storage battery in electric car, in conjunction with local Spot Price, judges electricity
The participation energy schedulers of electrical automobile, improve the economy of system.
3, method proposed by the invention can online real-time perfoming micro-grid system energy scheduling, fast response time is applicable in
Property it is good, operating process is easy, and economic benefit is obvious, has preferable application value.
Detailed description of the invention
Fig. 1 is the flow chart of the method for the present invention.
Specific embodiment
The invention will be further described below.Following embodiment is only used for clearly illustrating technical side of the invention
Case, and not intended to limit the protection scope of the present invention.
Referring to Fig. 1, the V2G microgrid energy control method of consideration economic optimization of the invention, the specific steps are as follows:
Each module power generation general power of S1, real-time collecting micro-grid system and load consuming power, are denoted as P and P respectivelyload.This
In each module it is related with electricity generation system type, if that is, system is containing the multimodes such as photovoltaic, wind-powered electricity generation, diesel engine, it is each to collect it
A module output power adds up.Each performance number can be obtained directly from ammeter.
S2, differentiate P and PloadRelationship, if P >=Pload, then follow the steps S3；If P < Pload, execute step S6.
S3, the SOC value for measuring electric car internal motivation battery at this time, are denoted as SOC*.Compare SOC*With SOCmaxRelationship,
If SOC*≥SOCmax, then S4 is executed；If SOC*< SOCmax, then step S5 is carried out.Wherein, SOC*It can be surveyed by open circuit voltage method
, SOCmaxThe maximum SOC value for referring to power battery, is chosen (by taking lithium battery as an example, often according to the demand of electric car
No more than 80%).
S4, excrescent electric power is generated electricity by way of merging two or more grid systems, until no longer meeting SOC*≥SOCmax, wherein excrescent electric power are as follows: P1=P-
Pload。
S5, excrescent electric power charge to the power battery of electric car, until no longer meeting SOC*< SOCmax。
S6, the SOC value for measuring electric car internal motivation battery at this time, are denoted as SOC*.Compare SOC*With SOCminRelationship,
If SOC*≤SOCmin, then follow the steps S7；If SOC*> SOCmin, then step S8 is carried out.Wherein, SOC*Open-circuit voltage can be passed through
Method measures, SOCminRefer to that power battery maintains the minimum SOC value of performance requirement, chooses as follows: (SOCmin-SOC0)*CN≥Ws
In formula, SOC0Permitted SOC minimum value under cycle life optimal conditions, C are considered for power batteryNIt is used dynamic
The capacity of power battery can directly obtain, W from nameplatesEnergy needed for travelling respective distance for electric car with rated power
Amount.Here respective distance refers to that the daily operating range of electric car is identical.
WsCalculating it is as follows:
In formula, PDFor the rated output power of motor in electric automobile, s is the operating range of electric car, and v is electric car
Average speed within this distance.
S7, electric car are not involved in energy scheduling, and power grid gives load to energize together with micro-grid system, until no longer meeting
SOC*≤SOCmin。
Institute's energy bring economic benefit when S8, quantization use power battery as power source remembers that its benefit is f1；It obtains
The Spot Price at this moment, is denoted as f2, then it is transferred to step S9.
Wherein, f1Institute's energy bring economic benefit, calculation formula are as follows when referring to power battery as power source:
f1=s1+s2
In formula, s1For general-utility car travel same distance consumed by fuel cost, same distance refer to in step S6
Identical distance；s2For carbon transaction bring emission reduction benefit.Carbon transaction emission reduction benefit is generally converted into CO2Discharge is reduced to be brought
Subsidies granted for policy considerations, be mainly reflected in the political affairs with each province of various countries using carbon dioxide as in the greenhouse gas emission of representative power transaction
Plan is related.It can quantify according to actual location problem.
S9, compare f1With f2Relationship, if f1> f2, then follow the steps S7；If f1≤f2, then follow the steps S10.
S10, the maximum power that power battery can be output when not influencing its cycle life is chosen, is denoted as Pb, the PbValue with
Battery variety, material are related.Compare P, PbWith PloadRelationship.If P+Pb≥Pload, then adjust and enable its output power PsFor Ps=
PloadThen-P executes step S11；If P+Pb< Pload, then follow the steps S12.
S11, electric car participate in energy scheduling, and electric automobile power battery gives load to energize together with micro-grid system.
S12, electric car participate in energy scheduling, and electric automobile power battery, power grid give load to supply together with micro-grid system
Energy.
Claims (6)
1. a kind of V2G microgrid energy control method for considering economic optimization, which is characterized in that including the following steps:
1) the power generation general power and load consuming power for the module that real-time collecting micro-grid system is included, is denoted as P and P respectivelyload；
2) differentiate P and PloadRelationship, if P >=Pload, then it is transferred to step 3)；If P < Pload, then it is transferred to step 6)；
3) SOC value for measuring electric car internal motivation battery at this time, is denoted as SOC*；Compare SOC*With SOCmaxRelationship, if
SOC*≥SOCmax, then it is transferred to step 4)；If SOC*< SOCmax, then it is transferred to step 5)；Wherein, SOCmaxRefer to power battery most
Big SOC value；
4) excrescent electric power is generated electricity by way of merging two or more grid systems, until no longer meeting SOC*≥SOCmax, wherein excrescent electric power P1=P-Pload；
5) excrescent electric power charges to the power battery of electric car, until no longer meeting SOC*< SOCmax；
6) SOC value for measuring electric car internal motivation battery at this time, is denoted as SOC*；Compare SOC*With SOCminRelationship, if
SOC*≤SOCmin, then it is transferred to step 7)；If SOC*> SOCmin, then step 8) is carried out；The SOCminRefer to that power battery maintains
The minimum SOC value of performance requirement；
7) electric car is not involved in energy scheduling, and power grid gives load to energize together with micro-grid system, until no longer meeting SOC*≤
SOCmin；
8) institute's energy bring economic benefit when quantization uses power battery as power source, note benefit are f1；Obtain this moment
Spot Price is denoted as f2, then it is transferred to step 9)；
9), compare f1With f2, relationship, if f1> f2, then it is transferred to step 7)；If f1≤f2, then it is transferred to step 10)；
10) maximum power that power battery can be output when not influencing its cycle life is chosen, P is denoted asb, compare P, PbWith
PloadRelationship；If P+Pb≥Pload, then adjust and enable its output power PsFor Ps=Pload- P, is transferred to step 11)；If P+Pb<
Pload, then it is transferred to step 12)；
11) electric car participates in energy scheduling, and electric automobile power battery gives load to energize together with micro-grid system；
12) electric car participates in energy scheduling, and electric automobile power battery, power grid give load to energize together with micro-grid system.
2. a kind of V2G microgrid energy control method for considering economic optimization according to claim 1, which is characterized in that institute
State the SOC in step 3) and step 6)*It is measured by open circuit voltage method.
3. a kind of V2G microgrid energy control method for considering economic optimization according to claim 1, which is characterized in that institute
State SOC in step 3)maxNo more than 80%.
4. a kind of V2G microgrid energy control method for considering economic optimization according to claim 1, which is characterized in that institute
State SOC in step 6)minIt chooses as follows:
(SOCmin-SOC0)*CN≥Ws
Wherein, SOC0Permitted SOC minimum value under cycle life optimal conditions, C are considered for power batteryNFor power battery
Capacity, WsEnergy needed for travelling daily operating range for electric car with rated power.
5. a kind of V2G microgrid energy control method for considering economic optimization according to claim 4, which is characterized in that institute
State WsCalculating it is as follows:
Wherein, PDFor the rated output power of motor in electric automobile, s is the operating range of electric car, v be electric car herein
Average speed in distance.
6. a kind of V2G microgrid energy control method for considering economic optimization according to claim 1, which is characterized in that institute
It states in step 8), f1Calculating it is as follows:
f1=s1+s2
Wherein, s1Fuel cost consumed by daily operating range, s are travelled for general-utility car2For carbon transaction bring emission reduction economy effect
Benefit.
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| CN110303931A (en) * | 2019-05-29 | 2019-10-08 | 北京航盛新能科技有限公司 | A kind of Intelligent charging method for electromobile suitable for V2G |
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