CN110492512A - The control method of frequency modulation or peak regulation mode in a kind of light storage association system - Google Patents
The control method of frequency modulation or peak regulation mode in a kind of light storage association system Download PDFInfo
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- CN110492512A CN110492512A CN201910865608.3A CN201910865608A CN110492512A CN 110492512 A CN110492512 A CN 110492512A CN 201910865608 A CN201910865608 A CN 201910865608A CN 110492512 A CN110492512 A CN 110492512A
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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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
- 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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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses the control method of frequency modulation or peak regulation mode in a kind of light storage association system, step includes: 1, according to local load peak interval of time, contributes situation in conjunction with photovoltaic, the peak regulation charge and discharge period is arranged；2, energy-storage battery state-of-charge SOC subregion is set；3, light storage association system detects mains frequency f, determines storage energy operation mode；4, consider inverter idle capacity restrictive condition；5, energy-storage battery maximum output constraint factor λ is setSOC；6, consider maximum constrained coefficient restrictive condition.The present invention can make full use of photovoltaic DC-to-AC converter idle capacity, and photovoltaic plant is made to have frequency modulation/peak regulation ability, mitigate the pressure of power grid frequency modulation unit and regulating units.
Description
Technical field
The present invention relates to light to store up association system control strategy field, in particular to one kind can run on two kinds of frequency modulation/peak regulation
The light of mode stores up association system control strategy.
Background technique
The frequency modulation task of traditional power grid is mainly undertaken by fired power generating unit, with the rapid growth of new energy ratio in power grid,
Fired power generating unit is gradually backed out, and the frequency regulation capacity in system is reduced rapidly, the fm capacity decline of power grid.Therefore it is required that in power grid
Renewable energy has fm capacity, to make up as fired power generating unit exits and reduced frequency modulation unit capacity.
In terms of photovoltaic participates in power grid frequency modulation, current research is broadly divided into photovoltaic plant and participates individually in power grid frequency modulation and new
The energy and energy storage association system participate in power grid frequency modulation two ways.
In terms of photovoltaic plant participates individually in the control strategy of power grid frequency modulation, grid-connected photovoltaic power station is controlled using power difference
Mode changes the off-load rate of photovoltaic plant for different illumination parameter or mains frequency, makes photovoltaic plant subtracting in floating
Horizontal lower operation is carried, has the ability that up/down adjusts mains frequency.However, this photovoltaic participates individually in the mode of frequency modulation,
Its effect and photovoltaic power output situation are closely related, and the mode of frequency regulation of reserved photovoltaic power output will lead to and abandon light, system economy is deteriorated,
And in view of the fluctuation and randomness of photovoltaic power output, this mode should not be as the main mode of frequency regulation of electric system.So when
Actual promotion and application are not yet received in preceding photovoltaic frequency modulation.
Currently, extensive energy storage technology the present has had power grid frequency modulation ability, and the application is that energy storage most connects in power domain
The typical case of nearly commercial operation.Therefore, in terms of new energy and energy storage association system participate in power grid frequency modulation, energy storage is relied primarily on
Battery adjusts the power output of association system to participate in power grid frequency modulation, and new energy resources system is controlled using maximal power tracing, energy-storage battery
By stabilizing the output-power fluctuation of new energy, to mitigate the influence that new energy generates mains frequency.Add in photovoltaic plant
Enter energy-storage battery, so that energy-storage battery and photovoltaic cooperation is participated in the frequency modulation of power grid, power grid tune can be participated individually in avoid photovoltaic
The uneconomical problem of reserved photovoltaic power output is needed when frequency, and due to the controllability and stability of energy-storage battery charge and discharge, light storage system
System participates in power grid frequency modulation, and compared to photovoltaic to participate individually in power grid frequency modulation reliability higher.
But existing light-preserved system, gird-connected inverter are configured according to the sum of new energy and energy-storage battery maximum output,
Photovoltaic can be only achieved full hair when only intensity of illumination is most strong at noon, and inverter capacity is all available free in addition to this, causes to waste.
According further to measured data, 99% or more time in 24 hours, system frequency is in light-preserved system Regulation dead-band, undertakes frequency modulation
The energy-storage battery of function is failure to actuate, and idle state is in.
Summary of the invention
The present invention is to provide frequency modulation or peak regulation mould in a kind of light storage association system in place of overcoming the shortcomings of the prior art
The control method of formula makes to make full use of the idle capacity of energy-storage battery in inverter idle capacity and Regulation dead-band
Photovoltaic plant has frequency modulation/peak regulation ability, to mitigate the pressure of power grid frequency modulation unit and regulating units.
It is as follows that the present invention solves technical solution used by above-mentioned technical problem:
The control method of frequency modulation or peak regulation mode in a kind of present invention light storage association system, the light storage association system be
The DC side of photovoltaic combining inverter is connected in parallel to photovoltaic cell and energy storage inverter, the energy storage change of current by DC bus
Device is connected with energy-storage battery；Power grid is accessed after boosting by transformer in the exchange side of the photovoltaic combining inverter；Its main feature is that
The control method is the steps of progress:
The peak regulation charge and discharge period is arranged in conjunction with photovoltaic power output situation according to local load peak interval of time in step 1；
Step 2, the state-of-charge SOC subregion that energy-storage battery is set, when so that the energy-storage battery running on peak regulation mode
Remaining as hopping pattern, there are Capacity Margins；
The upper limit of step 2.1, setting state-of-charge SOC under hopping pattern is SOCmax, lower limit SOCmin；
The charging upper limit of step 2.2, setting state-of-charge SOC under peak regulation mode is SOChigh, electric discharge lower limit be
SOClow, and SOCmax>SOChigh>SOClow>SOCmin；
Step 3, light storage association system detect mains frequency f, enable frequency deviation f=f-50, determine frequency departure
Whether Δ f exceeds Regulation dead-band [Δ fmin,Δfmax]；If exceeding, the energy-storage battery is enabled to run on hopping pattern；Otherwise,
The energy-storage battery is enabled to run on peak regulation mode；Wherein, Δ fminIndicate the maximum value that mains frequency f allows to offset downward, Δ
fmaxThe maximum value that mains frequency f allows to offset up；
If step 3.1, Δ f > Δ fmax, and state-of-charge SOC ∈ [SOCmin,SOCmax], then the energy-storage battery is with volume
Determine power PeTo participate in frequency modulation, enabling the primary reference power of the energy-storage battery is P ' for chargingess=-Pe；
If step 3.2, Δ f < Δ fmin, and state-of-charge SOC ∈ [SOCmin,SOCmax], then the energy-storage battery is with volume
Determine power PeTo participate in frequency modulation, enabling the primary reference power of the energy-storage battery is P ' for electric dischargeess=Pe；
If step 3.3, Δ f ∈ [Δ fmin,Δfmax], then the energy-storage battery according to the peak regulation charge and discharge period into
Action is made:
If in peak regulation discharge time section, and state-of-charge SOC ∈ [SOClow,SOCmax], then the energy-storage battery with α ×
PeTo participate in peak regulation, enabling the primary reference power of the energy-storage battery is P ' for electric dischargeess=α Pe；
If in peak regulation charging time section, and state-of-charge SOC ∈ [SOCmin,SOChigh], then the energy-storage battery is with α
×PeTo participate in peak regulation, enabling the primary reference power of the energy-storage battery is P for charginge′ss=-α Pe；Wherein, α indicates the storage
It can charge-discharge electric power coefficient of the battery under peak regulation mode；
Step 4 is guaranteeing photovoltaic power output PpvIn the case that whole is grid-connected, the idle capacity P ' of photovoltaic combining invertervscFor
Energy-storage battery uses, wherein P 'vsc=Pvsc-Ppv, PvscFor inverter maximum capacity, P 'vsc≥0；
Step 4.1, when energy-storage battery charging, the primary reference power P 'ess< 0, the photovoltaic grid-connected inversion
Device is to the rechargeable energy of the energy-storage battery without capacity limit；
Step 4.2, when energy-storage battery electric discharge, the primary reference power P 'ess> 0, the energy-storage battery fill
Electric flux is transported to power grid by photovoltaic combining inverter, then the secondary reference power of energy-storage battery is P 'ess=min { P 'ess,
P′vsc}；
Step 5, the setting energy-storage battery maximum output constraint factor λSOC；
Step 5.1 obtains the energy-storage battery using formula (1) in the maximum output constraint factor λ of discharge regimeSOC:
Step 5.2 obtains the energy-storage battery using formula (2) in the maximum output constraint factor λ of charging stageSOC:
Step 6, the energy-storage battery are according to final reference power Pess=P "ess×λSOCCharge and discharge are carried out to participate in electricity
The frequency modulation or peak regulation of net.
Compared with the prior art, the beneficial effects of the present invention are embodied in:
1, in control method of the present invention light storage association system detect mains frequency, energy-storage battery run on hopping pattern or
Peak regulation mode solves the problems, such as that existing photovoltaic plant does not have frequency modulation or peak modulation capacity, photovoltaic plant is enable to participate in power grid
Frequency modulation or peak regulation reduce the installed capacity of conventional frequency modulation unit and regulating units in power grid, improve the stability of power grid.
2, in control method of the present invention, the energy of energy-storage battery release is transported to electricity by existing photovoltaic combining inverter
Net does not need to install individual energy storage gird-connected inverter additional, simplifies the reconstruction step of practical photovoltaic plant, saves reconstruction expense,
The idle capacity of photovoltaic combining inverter in photovoltaic plant is utilized in energy-storage battery simultaneously, improves existing photovoltaic combining inverter
Capacity utilization.
3 control methods of the present invention are provided with energy-storage battery keep-out area, frequency modulation area, peak regulation charging zone, four class of peak regulation region of discharge
State-of-charge subregion so that energy-storage battery is avoided and overcharged and the problem of over-discharge, while runs energy-storage battery
It is always that there are Capacity Margins for hopping pattern when peak regulation mode, realizes the coordination of energy-storage battery frequency modulation/peak regulation both of which
Operation.
4 control methods of the present invention consider the charge-discharge characteristic of energy-storage battery, construct the storage based on state-of-charge constraint
Can battery maximum output coefficient constrain its power output, enable the energy-storage battery in low state-of-charge with low discharging current, In
With low current charge when highly charged state, it is insufficient to solve the problems, such as that energy-storage battery capacity utilizes, while extending energy storage electricity
The service life in pond.
Detailed description of the invention
Fig. 1 is the integrated control method flow chart that light stores up association system in the present invention；
Fig. 2 is that light stores up association system topology diagram in the embodiment of the present invention；
Fig. 3 is energy storage charge state block plan in the present invention；
Fig. 4 is energy-storage battery maximum output constraint factor curve graph in the present invention；
Fig. 5 is the day illumination intensity in the embodiment of the present invention；
Fig. 6 is the mains frequency fluctuation curve graph in the embodiment of the present invention；
Fig. 7 a is association system power output and photovoltaic power output comparison diagram in the embodiment of the present invention；
Fig. 7 b is energy-storage battery state-of-charge curve graph in the embodiment of the present invention.
Specific embodiment
In the present embodiment, it is as shown in Figure 2 that light stores up association system topological diagram.Pass through in the DC side of photovoltaic combining inverter straight
Stream bus is connected in parallel to photovoltaic cell and energy storage inverter, and energy storage inverter is connected with energy-storage battery；Photovoltaic combining inverter
Exchange side by transformer boost after access power grid；Photovoltaic combining inverter uses Integration Design, prime DC/DC Boost
Circuit realizes maximal power tracing control, and rear class uses Three-phase full-bridge DC/AC converter, realizes that power is grid-connected；Energy storage unsteady flow
Device uses DC/DC Boost circuit.In a kind of light storage association system the control method of frequency modulation or peak regulation mode be the steps of into
Row:
Step 1, local load peak interval of time are as shown in table 2, and energy storage is arranged in load peak interval of time combination photovoltaic power output situation
The battery peak regulation charge and discharge period is as shown in table 3；
The state-of-charge SOC subregion of energy-storage battery is arranged as shown in figure 3, energy-storage battery is made to run on peak regulation mould in step 2
Hopping pattern is remained as when formula, and there are Capacity Margins；
Step 2.1, energy-storage battery overcharge/and over-discharge can damage battery, and to avoid this situation, setting state-of-charge SOC is being adjusted
The upper limit under frequency mode is SOCmax, lower limit SOCmin, charge and reach upper limit SOCmaxWhen do not recharge, electric discharge reach lower limit
SOCminShi Buzai electric discharge；
Step 2.2, the frequency modulation task of power grid prior to peak regulation task, therefore to make energy-storage battery under peak regulation mode still
For hopping pattern, there are nargin, and it is SOC that charging upper limit of the state-of-charge SOC under peak regulation mode, which is arranged,high, electric discharge lower limit be
SOClow, and SOCmax>SOChigh>SOClow>SOCmin；
Step 3, light storage association system detect mains frequency f, enable frequency deviation f=f-50, determine that frequency deviation f is
It is no to exceed Regulation dead-band [Δ fmin,Δfmax]；If exceeding, energy-storage battery is enabled to run on hopping pattern；Otherwise, energy-storage battery is enabled
Run on peak regulation mode；Wherein, Δ fminIndicate the maximum value that mains frequency f allows to offset downward, Δ fmaxIndicate mains frequency f
The maximum value for allowing to offset up；
If step 3.1, Δ f exceed Regulation dead-band, energy-storage battery is acted according to frequency shift (FS) direction, in frequency modulation mould
Under formula, energy-storage battery as far as possible more in a short time will absorb or issue power to support mains frequency, and therefore, setting energy storage is electric
Pond carries out charge and discharge with rated power.Guarantee do not overcharge/over-discharge under the premise of, be arranged energy-storage battery under hopping pattern just
Grade reference power and state-of-charge constrain are as follows:
If Δ f > Δ fmax, and state-of-charge SOC ∈ [SOCmin,SOCmax], then energy-storage battery is with rated power PeCharging
Frequency modulation is participated in, enabling the primary reference power of energy-storage battery is P 'ess=-Pe；
If Δ f < Δ fmin, and state-of-charge SOC ∈ [SOCmin,SOCmax], then energy-storage battery is with rated power PeElectric discharge
Frequency modulation is participated in, enabling the primary reference power of energy-storage battery is P 'ess=Pe；
If step 3.2, Δ f ∈ [Δ fmin,Δfmax], then energy-storage battery is acted according to the peak regulation charge and discharge period,
Under peak regulation mode, the duration of energy-storage battery charge and discharge is in hour grade, therefore energy-storage battery can be adopted according to itself amount of capacity
It takes smaller power to carry out charge and discharge, extends the service life of energy-storage battery with this.In practical projects, state-of-charge is not considered
α times of energy-storage battery rated power is usually set when constraint, under peak regulation mode and carries out charge and discharge for primary reference power, wherein α table
Show charge-discharge electric power coefficient of the energy-storage battery under peak regulation mode.According to local load peak interval of time, guaranteeing energy-storage battery not
Overcharge/over-discharge under the premise of, be energy-storage battery hopping pattern there are certain capacity nargin.Therefore setting energy-storage battery is in peak regulation
Primary reference power and state-of-charge under mode constrain are as follows:
If in peak regulation discharge time section, and state-of-charge SOC ∈ [SOClow,SOCmax], then energy-storage battery is with α × PeFor
To participate in peak regulation, enabling the primary reference power of energy-storage battery is P ' for primary reference power electric dischargeess=α Pe；
If in peak regulation charging time section, and state-of-charge SOC ∈ [SOCmin,SOChigh], then energy-storage battery is with α × PeFor
To participate in peak regulation, enabling the primary reference power of energy-storage battery is P ' for primary reference power chargingess=-α Pe；
Step 4 is guaranteeing photovoltaic power output PpvIn the case that whole is grid-connected, the idle capacity P ' of photovoltaic combining invertervscFor
Energy-storage battery uses, wherein P 'vsc=Pvsc-Ppv, PvscFor the maximum capacity under inverter overload situations, P 'vsc≥0；
Step 4.1, when energy-storage battery charging when, primary reference power P 'ess< 0, photovoltaic combining inverter is to energy-storage battery
Rechargeable energy without capacity limit；
Step 4.2, when energy-storage battery electric discharge when, primary reference power P 'essThe rechargeable energy of > 0, energy-storage battery pass through light
Volt gird-connected inverter is transported to power grid, then the secondary reference power of energy-storage battery is P "ess=min { P 'ess,P′vsc}；
When step 5, energy-storage battery responsive electricity grid frequency modulation/peak regulation demand, if will lead to energy storage electricity with invariable power charge and discharge
Pond can not be completely filled with or discharge electric energy completely, to waste the capacity of energy-storage battery, cause economic loss.Therefore, it should design
Reasonable energy-storage battery maximum output constraint factor λSOC, make energy-storage battery with the charge-discharge electric power that changes participate in the frequency modulation of power grid/
Peak regulation.Energy-storage battery maximum output constraint factor λ is setSOC, as shown in Figure 4；
The step 5.1, (SOC ∈ (SOC when energy-storage battery state-of-charge is higherβ,SOCmax]), energy-storage battery is with Pe′s′sInto
Row electric discharge；When discharge into energy-storage battery state-of-charge it is lower when (SOC ∈ [SOCmin,SOCβ]), to make full use of energy-storage battery to hold
Over-discharge is measured and avoids, energy-storage battery is with P 'essMultiplied by a λ less than 1SOCIt discharges, and λSOCWith state-of-charge decline
It is smaller.Energy-storage battery is obtained in the maximum output constraint factor λ of discharge regime using formula (1)SOC:
The step 5.2, (SOC ∈ [SOC when energy-storage battery state-of-charge is lowermin,SOCβ]), energy-storage battery is according to P 'ess
Charge, when be charged to energy-storage battery state-of-charge it is higher when (SOC ∈ (SOCβ,SOCmax]), to make full use of energy-storage battery
It capacity and avoids overcharging, energy-storage battery is with P "essMultiplied by a λ less than 1SOCIt charges, and λSOCRise with state-of-charge
And reduce.Energy-storage battery is obtained in the maximum output constraint factor λ of charging stage using formula (2)SOC:
Step 6, energy-storage battery are according to final reference power Pess=P "ess×λSOCCharge and discharge are carried out to participate in power grid
Frequency modulation or peak regulation.When energy-storage battery power output is optimized with above-mentioned maximum output constraint factor, it is ensured that energy-storage battery tool
There is the ability of quick response, while the capacity of energy-storage battery can be made full use of again and energy-storage battery is avoided to overcharge/over-discharge, extends
The service life of energy-storage battery.
Embodiment:
1, according to the topological structure of photovoltaic plant and model parameter, photovoltaic electric is built in MATLAB/Simulink software
It stands detailed model.Photovoltaic plant topological structure is shown in Fig. 2, and model parameter is shown in Table 1.
1 model parameter of table
| Photovoltaic installed capacity/kW | 30 | Energy-storage battery rated capacity/Ah | 300 |
| SOCmax | 95% | SOCmin | 5% |
| SOChigh | 85% | SOClow | 15% |
| SOCβ | 50% | α | 0.3 |
| Energy-storage battery rated power/kW | 10 | Inverter capacity/kVA | 30 |
| Inverter overload capacity | 10% | Transformer capacity/kVA | 50 |
| Step down side voltage/V | 220 | High voltage side of transformer voltage/V | 380 |
| Environment temperature/DEG C | 25 | Day illumination curve | Fig. 5 |
| Mains frequency fluctuation curve | Fig. 6 | Δfmax/Hz | 0.06 |
| Δfmin/Hz | -0.06 | Network voltage/V | 380 |
2, according to step 1, energy-storage battery is needed when operating in peak regulation mode according to local load peak interval of time setting storage
The charge and discharge period of energy battery, the load peak interval of time that certain is saved are as shown in table 2:
The load peak interval of time of certain province of table 2
It is unidirectional inversion since photovoltaic combining inverter only supports energy to be transported to grid side from photovoltaic side in photovoltaic plant
Device removes load variations so the energy that is absorbed of energy-storage battery is from photovoltaic, therefore the charge and discharge period setting of energy-storage battery
It is regular outer it is also contemplated that intensity of illumination changing rule.
Firstly, being set as energy-storage battery charge period before power output to first load peak period since photovoltaic in morning.
In embodiment hereof, 6:00 begins with intensity of illumination, therefore 6:00-9:00 is set as energy-storage battery charge period.
Secondly, 12:00-17:00, this period intensity of illumination is stronger, is that photovoltaic is contributed the more period in one day, setting storage
Energy battery charges in this period, this is also the main period of time that energy-storage battery charges in one day.
Again, it discharges in load peak period setting energy-storage battery.
Based on this, energy-storage battery is set and is worked under peak regulation mode, the charge and discharge period is as shown in table 3.
The charge and discharge period under 3 energy-storage battery peak regulation mode of table
3, according to step 2, the state-of-charge subregion of energy-storage battery is set.
In proposed control strategy, the priority of hopping pattern is higher than peak regulation mode.To ensure in peak regulation mistake
Energy-storage battery is that there are Capacity Margins for hopping pattern in journey, when carrying out subregion to the state-of-charge of energy-storage battery, consideration following two
Kind situation:
(1) energy-storage battery overcharge/over-discharge can damage battery, to avoid this situation, energy-storage battery charge and discharge under hopping pattern
State-of-charge section be [5%, 95%], charging does not recharge when reaching the upper limit 95%, and electric discharge is no longer put when reaching lower limit 5%
Electricity.
It (2) is to ensure that energy-storage battery is that there are Capacity Margins for hopping pattern, therefore set energy-storage battery under peak regulation mode
Under peak regulation mode, charging upper limit 85%, electric discharge lower limit is 15%.
4, according to step 3, light stores up coordinated control system and detects mains frequency f, enables Δ f=f-50, determines whether Δ f is in
Regulation dead-band.If Δ f exceeds Regulation dead-band, energy-storage battery now operates on hopping pattern；If Δ f is without departing from Regulation dead-band, storage
Energy battery now operates on peak regulation mode.As Δ f > 0.06, and SOC ∈ [5%, 95%] at this time, then energy-storage battery is with specified function
Rate 10kW charges to participate in frequency modulation, and the primary reference power of energy-storage battery is P ' at this timeess=-10.If < -0.06 Δ f, and this
When SOC ∈ [5%, 95%], then energy-storage battery is discharged with rated power 10kW participates in frequency modulation, at this time the primary ginseng of energy-storage battery
Examining power is P 'ess=10.If Δ f ∈ [- 0.06,0.06], energy-storage battery is acted according to the peak regulation period.If being now in
Peak regulation discharges the period, and SOC ∈ [15%, 95%], and energy-storage battery participates in peak regulation with 3kW electric discharge, at this time energy-storage battery just
Grade reference power P 'ess=3；If being now in peak regulation charge period, and SOC ∈ [5%, 85%], energy-storage battery is charged with 3kW
Peak regulation is participated in, at this time the primary reference power P ' of energy-storage batteryess=-3.
5, according to step 4, inverter capacity is 30kW, overload capacity 10%, i.e. maximum under inverter overload situations
Capacity Pvsc=33kW, to guarantee that photovoltaic power output can be all grid-connected, energy-storage battery participates in that inverter should be utilized when frequency modulation/peak regulation
Idle capacity P 'vsc, P 'vsc=33-Ppv, because inverter maximum capacity is greater than photovoltaic and completely sends out power, P 'vsc> 0.Work as storage
P ' when energy battery chargingess< 0, power do not have to consider inverter capacity limit without inverter.When energy-storage battery electric discharge
P′ess> 0, power are transported to power grid by inverter, need to consider that inverter maximum capacity limits.Therefore, time of energy-storage battery
Grade reference power P "essFor P "ess=min { P 'ess,P′vsc}。
6, according to step 5, to avoid energy-storage battery from overcharging/over-discharge, and the capacity of energy-storage battery is made full use of, setting storage
It can battery maximum output constraint factor λSOC.When SOC ∈ (50%, 95%], according to P 'essIt discharges；When discharging into SOC ∈
[5%, 50%], to make full use of energy-storage battery capacity and avoiding over-discharge, energy-storage battery is with P 'ess×λSOCIt discharges, and
λSOCIt is smaller with SOC decline.I.e.When SOC ∈ [5%, 50%], according to
P′essCharge, when be charged to SOC ∈ (50%, 95%], to make full use of energy-storage battery capacity and avoiding overcharging, energy storage
Battery is with P 'ess×λSOCIt charges, and λSOCRise with SOC and reduces.I.e.
That is energy-storage battery maximum output constraint factor curve is as shown in Figure 4.
7, according to step 6, the final reference power of energy-storage battery is Pess=P "ess×λSOC。
Model is built in MATLAB/Simulink, progress simulation calculating obtains light storage association system power output and goes out with photovoltaic
Power comparison diagram and energy-storage battery SOC curve, as shown in figs. 7 a and 7b.
According to the charge and discharge strategy of energy-storage battery, between 0:00-6:00, load is in usually section, energy-storage battery are not required to
It discharges, and since photovoltaic is not contributed, energy-storage battery does not charge.But in 0:31:12 and 0:38:24, grid disturbance causes
Frequency drops to 49.91Hz respectively and rises to 50.09Hz (Fig. 6).It can see by Fig. 7 a and Fig. 7 b, when frequency is
When 49.91Hz, energy storage charge state 50%, energy-storage battery participates in frequency modulation with the power discharge of 10kW；But when frequency is higher than
When 50.06Hz, since photovoltaic is not contributed, energy-storage battery can not charge and participate in frequency modulation.
6:00-9:00 is charge period, energy-storage battery charging.It can see by Fig. 7 a and Fig. 7 b, 6:00-7:00 photovoltaic goes out
Power is 0.72kW, is less than energy-storage battery reference power 3kW, and therefore, energy-storage battery is charged with the power of 0.72kW, at this time charged shape
State rises slower；7:00-9:00, photovoltaic power output are 4kW, and energy-storage battery state-of-charge is 51.5% when 7:00, energy-storage battery with
The power of 2.91kW charges, and state-of-charge rises very fast during this.Constrained by state-of-charge, charge power 7:00-9:00 by
2.56kW is gradually dropped to, light-preserved system power output gradually increases.
9:00-12:00 is the electric discharge period, and can see energy-storage battery by Fig. 7 a and Fig. 7 b, state-of-charge exists during this period
50% or more, energy-storage battery is discharged with invariable power 3kW participates in peak regulation.
It can see by Fig. 7 a and Fig. 7 b, 9:31:30 frequency drops to 49.92Hz, exceeds Regulation dead-band, the electricity of energy storage at this time
The state-of-charge in pond is 61.5%, and energy-storage battery participates in frequency modulation with the power discharge of 10kW；9:42:00 frequency rises to
50.1Hz, energy-storage battery state-of-charge is 59.3% at this time, therefore is charged with the power of 8.14kW and participate in frequency modulation；11:12:00 frequency
Rate rises to 50.11Hz, and the state-of-charge of energy-storage battery is 55% at this time, therefore is charged with the power of 9kW and participate in frequency modulation；11:
43:11 frequency drops to 49.89Hz, but light-preserved system gross capability has reached inverter maximum power 33kW, energy storage electricity at this time
Pond, which can not discharge, participates in frequency modulation.
12:00-17:00 is in charge period, can see by Fig. 7 a and Fig. 7 b, and the state-of-charge of energy-storage battery is in this phase
Between by 52.3% rise to 73.5%, constrained by state-of-charge, energy-storage battery charge power is down to 1.59kW by 2.86kW.
17:00-22:00 is in the peak regulation electric discharge period, and it is charged during this period to can see energy-storage battery by Fig. 7 a and Fig. 7 b
State is discharged with invariable power 3kW 50% or more and participates in peak regulation.18:46:48 frequency drops to 49.89Hz, dead beyond frequency modulation
Area, at this point, the state-of-charge of energy-storage battery is 65%, therefore participates in frequency modulation with the power discharge of 10kW；In 19:48:00 frequency
It is raised to 50.1Hz, due to contributing at this time without photovoltaic, energy-storage battery can not charge, so energy-storage battery stops electric discharge at this time and participates in
Frequency modulation.
Claims (1)
1. the control method of frequency modulation or peak regulation mode in a kind of light storage association system, the light storage association system is grid-connected
The DC side of inverter is connected in parallel to photovoltaic cell and energy storage inverter, the energy storage inverter and energy storage by DC bus
Battery is connected；Power grid is accessed after boosting by transformer in the exchange side of the photovoltaic combining inverter；It is characterized in that the control
Method is the steps of progress:
The peak regulation charge and discharge period is arranged in conjunction with photovoltaic power output situation according to local load peak interval of time in step 1；
Step 2, the state-of-charge SOC subregion that energy-storage battery is set, so that when the energy-storage battery runs on peak regulation mode still
For hopping pattern, there are Capacity Margins；
The upper limit of step 2.1, setting state-of-charge SOC under hopping pattern is SOCmax, lower limit SOCmin；
The charging upper limit of step 2.2, setting state-of-charge SOC under peak regulation mode is SOChigh, electric discharge lower limit is SOClow, and
SOCmax>SOChigh>SOClow>SOCmin；
Step 3, light storage association system detect mains frequency f, enable frequency deviation f=f-50, determine that frequency deviation f is
It is no to exceed Regulation dead-band [Δ fmin,Δfmax]；If exceeding, the energy-storage battery is enabled to run on hopping pattern；Otherwise, described in order
Energy-storage battery runs on peak regulation mode；Wherein, Δ fminIndicate the maximum value that mains frequency f allows to offset downward, Δ fmaxPower grid
The maximum value that frequency f allows to offset up；
If step 3.1, Δ f > Δ fmax, and state-of-charge SOC ∈ [SOCmin,SOCmax], then the energy-storage battery is with specified function
Rate PeTo participate in frequency modulation, enabling the primary reference power of the energy-storage battery is P ' for chargingess=-Pe；
If step 3.2, Δ f < Δ fmin, and state-of-charge SOC ∈ [SOCmin,SOCmax], then the energy-storage battery is with specified function
Rate PeTo participate in frequency modulation, enabling the primary reference power of the energy-storage battery is P ' for electric dischargeess=Pe；
If step 3.3, Δ f ∈ [Δ fmin,Δfmax], then the energy-storage battery is moved according to the peak regulation charge and discharge period
Make:
If in peak regulation discharge time section, and state-of-charge SOC ∈ [SOClow,SOCmax], then the energy-storage battery is with α × PeIt puts
Electricity participates in peak regulation, and enabling the primary reference power of the energy-storage battery is P 'ess=α Pe；
If in peak regulation charging time section, and state-of-charge SOC ∈ [SOCmin,SOChigh], then the energy-storage battery is with α × PeIt fills
Electricity participates in peak regulation, and enabling the primary reference power of the energy-storage battery is P 'ess=-α Pe；Wherein, α indicates the energy storage electricity
Charge-discharge electric power coefficient of the pond under peak regulation mode；
Step 4 is guaranteeing photovoltaic power output PpvIn the case that whole is grid-connected, the idle capacity P ' of photovoltaic combining invertervscFor energy storage
Battery uses, wherein P 'vsc=Pvsc-Ppv, PvscFor inverter maximum capacity, P 'vsc≥0；
Step 4.1, when energy-storage battery charging, the primary reference power P 'ess< 0, the photovoltaic combining inverter pair
The rechargeable energy of the energy-storage battery is without capacity limit；
Step 4.2, when energy-storage battery electric discharge, the primary reference power P 'ess> 0, the charging energy of the energy-storage battery
Amount is transported to power grid by photovoltaic combining inverter, then the secondary reference power of energy-storage battery is P 'ess=min { P 'ess,P
′vsc}；
Step 5, the setting energy-storage battery maximum output constraint factor λSOC；
Step 5.1 obtains the energy-storage battery using formula (1) in the maximum output constraint factor λ of discharge regimeSOC:
Step 5.2 obtains the energy-storage battery using formula (2) in the maximum output constraint factor λ of charging stageSOC:
Step 6, the energy-storage battery are according to final reference power Pess=P "ess×λSOCCharge and discharge are carried out to participate in power grid
Frequency modulation or peak regulation.
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