CN109995126A - A kind of modified load dynamic allocation method of light storage direct-current micro-grid - Google Patents
A kind of modified load dynamic allocation method of light storage direct-current micro-grid Download PDFInfo
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- CN109995126A CN109995126A CN201810766740.4A CN201810766740A CN109995126A CN 109995126 A CN109995126 A CN 109995126A CN 201810766740 A CN201810766740 A CN 201810766740A CN 109995126 A CN109995126 A CN 109995126A
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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
- 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
Abstract
A kind of modified load dynamic allocation method of light storage direct-current micro-grid is disclosed in the present invention, belongs to direct-current micro-grid technical field；Method is the following steps are included: step 1, load power weights assigned calculation method；Step 2, charge and discharge control link switches；Step 3, based on the load power method of salary distribution of electric current correction factor；Step 4, the secondary control link of busbar voltage.The modified load dynamic allocation method of light storage direct-current micro-grid provided by the invention, it can be according to current energy-storage units dynamic state of parameters Load adjustment power distribution mode, and it can be according to the different auto-changeover control strategies of energy-storage units charge and discharge link, realize the load power of reasonable distribution energy-storage units, and in the case where busbar voltage disturbs, busbar voltage can be dynamically adjusted.
Description
Technical field
The present invention relates to direct-current micro-grid technical fields, and in particular to a kind of modified load dynamic point of light storage direct-current micro-grid
Method of completing the square
Background technique
Compared to traditional AC microgrids, direct-current micro-grid has more without the concern for idle, frequency and phase problem
High stability, also just because of the flowing of not reactive power, voltage becomes reflection direct current micro-grid system power-balance only
One index.And with the increase of the electrical equipment using DC power supply as energy-provision way, in AC microgrids by AC/DC again to
The energy conversion process of DC/DC not only increases the complexity and control difficulty of system, and the loss in conversion process also results in
The waste of the energy, therefore direct-current micro-grid obtained more and more concerns.In direct-current micro-grid, photovoltaic power generation cleans nothing with it
The advantages that polluting, is flexible for installation becomes domestic and international research hotspot.In photovoltaic DC microgrid, due to the interruption and wave of photovoltaic power generation
Dynamic property results in it must realize that system is energized using the connection type combined with energy storage.
In view of load power demand and safeguards system safe and stable operation can generally be adopted in light storage direct-current micro-grid
The stable operation of system is maintained with multiple energy-storage units.Pass through two-way DC/DC converter between energy-storage units and DC bus
Energy exchange is carried out, each energy-storage units work in form in parallel, in system work due to each batteries to store energy unit
In design parameters such as such as state-of-charge (State of Charge, SOC), accumulator capacity and maximum input (out) power
On have nothing in common with each other, therefore load power distribution on also answer it is different.Common load distribution method mainly has centralized control
And decentralised control, decentralised control is based on sagging control, however although sagging control structure is simple, and there is also power distribution essences
The problems such as degree is insufficient, output voltage drop.
Summary of the invention
In view of the problem in traditional load power distribution method, the invention proposes a kind of lotuses for considering battery
The load power weights assigned calculation method of electricity condition, battery capacity and maximum input three parameters of (out) power, and propose
A kind of control method of the correction factor containing electric current is achieved the load power method of salary distribution proposed in the present invention, the party
Real-time dynamic allocation of the method in addition to can be realized the load power in traditional droop control method, additionally it is possible to avoid by sagging control
Generation caused by method the problems such as such as Voltage Drop.Furthermore for the electricity of bus caused by load sudden change in direct-current micro-grid
Voltage overshoot excessive situation when pressure fluctuation increases secondary control link and realizes the dynamic tune fluctuated to DC bus-bar voltage
It is whole.
For achieving the above object, the present invention takes technical solution below:
The invention proposes a kind of modified load dynamic allocation methods of light storage direct-current micro-grid, specifically include following step
It is rapid:
Step 1: load power weights assigned calculation method
Step 2: the switching of charge and discharge control link
Step 3: the load power method of salary distribution based on electric current correction factor
Step 4: the secondary control link of busbar voltage
The load power weights assigned calculation method of the step 1, the present invention is with the light Chu Zhi comprising two energy-storage units
It is discussed for stream microgrid, specific calculation is as follows:
Wherein, PM1、PM2Maximum input (out) power of respectively energy-storage units I and II, p1And p2Respectively energy-storage units I
Tale maximum inputs proportion in (out) power in energy-storage system with II.
Wherein, SOC1、SOC2The respectively state of charge of energy-storage units I and II, s1And s2Respectively energy-storage units I and
The SOC of II proportion, s in the energy-storage system tale SOC in electric discharge link1' and s2' it is respectively energy-storage units I and II
SOC proportion in the energy-storage system tale SOC in charging link.
Wherein, A1、A2The respectively accumulator capacity of energy-storage units I and II, a1And a2Respectively energy-storage units I and II exist
Proportion in energy-storage system tale capacity.
Ab1=kpp1+kss1+kaa1,A′b1=kpp1+kss′1+ka(1-a1) (5)
Ab2=kpp2+kss2+kaa2,A′b2=kpp2+kss′2+ka(1-a2) (6)
Wherein kp,、ksAnd kaPeak power output, SOC and the batteries to store energy unit for respectively indicating energy-storage units hold
Measure the weight that three parameters distribute the influence degree of battery load power distribution by it.Ab1And Ab2It respectively indicates and puts
Electric link energy-storage units I and II press its parameter load power allocation of parameters calculated, Ab1' and Ab2' respectively indicate charging link
Energy-storage units I and II press its parameter load power allocation of parameters calculated.Due to battery maximum charging and discharging capabilities no matter
Be charging link or electric discharge link all should be to be controlled by its peak power output, therefore, this parameter is being filled
Link of discharging is using unified setting.
The switching control of the charge and discharge control link of the step 2 is according to battery two-way voltage conversion in energy-storage units
The direction of inductive current is judged to realize in device, and when the direction of inductive current changes, control mode can also be sent out
It is raw to change
The step 3 includes following two step
Step 3-1: the sharing of load value and power reference of energy-storage units is calculated
Step 3-2: the load power method of salary distribution based on electric current correction factor
The calculation method of the sharing of load value and power reference of energy-storage units is by taking energy-storage units I as an example in the step 3-1, meter
Load power assigned references value when its charge/discharge is calculated, the calculation method of energy-storage units II is similarly.
Power distribution when energy-storage units I discharges is as follows:
The power distribution of its link that charges is as follows:
The calculation method of electric current correction factor is as follows in the step 3-2:
Wherein kiLFor parameter relevant to inductive current correction factor, value is 2 herein.Load power method of salary distribution tool
Body structure is as shown in Figure 2.
The secondary control link specific structure expression formula of step 4 busbar voltage are as follows:
eμ|△u| (10)
△ u indicates the difference between busbar voltage actual value and reference value in formula, and μ expression one and voltage fluctuation are to reference
The relevant ginseng of electric current influence degree.Compared with prior art, the beneficial effects of the present invention are:
(1) after controlling unit increases current parameters secondary control link, the electricity of the bus as caused by the factors such as load sudden change
Pressure fluctuation amplitude is obviously reduced.
(2) the invention proposes a kind of state-of-charge for considering battery, battery capacity and maximum input (out) power
The load power weights assigned calculation method of three parameters, and a kind of control method of correction factor containing electric current is proposed to make this hair
The load power method of salary distribution proposed in bright is achieved, and this method is negative in traditional droop control method in addition to can be realized
The real-time dynamic allocation of lotus power, additionally it is possible to the hair for the problems such as avoiding such as Voltage Drop as caused by droop control method
It is raw.The reasonable distribution that can be realized load power using the proposed control method of the present invention, avoids the super-charge super-discharge of battery, and
It can be according to the different auto-changeover control structures of charge and discharge link.
Detailed description of the invention
Fig. 1 is in presently preferred embodiments of the present invention, and light stores up direct-current micro-grid structure chart；
Fig. 2 is energy-storage units and its control structure in presently preferred embodiments of the present invention
Specific embodiment
The present invention will be further described with reference to the accompanying drawing.
It as shown is light storage direct-current micro-grid structure chart, wherein including photovoltaic generation unit, energy-storage units, energy conversion
The component parts such as device and load.And since there are the differences in characteristic and parameter between different energy-storage units, it needs
The distribution for considering output power between each energy-storage units mostly uses droop control mode in existing method, however sagging
Control method will appear the problems such as controlling insufficient precision, voltage drop although structure is simple.In addition to this for direct-current micro-grid
The case where busbar voltage caused by middle load sudden change is fallen, it is excessive to may result in busbar voltage overshoot when the load, into
And influence the operation of system normal table.Direct-current micro-grid is stored up for a kind of light as shown in Figure 1 is proposed in the above situation present invention
Modified load dynamic allocation method, this method can not only realize the real-time of the load power in traditional droop control method
It dynamically distributes, additionally it is possible to which the generation for the problems such as avoiding such as Voltage Drop as caused by droop control method can also store up
Adjust automatically control strategy and mode when the charging and discharging pattern switching of energy unit.Furthermore it may cause for load sudden change
The excessive situation of busbar voltage overshoot increases secondary control link to realize the secondary adjustment of busbar voltage.Of the invention is specific
Implementation method is as follows:
Step 1: load power weights assigned calculation method
Step 2: the switching of charge and discharge control link
Step 3: the load power method of salary distribution based on electric current correction factor
Step 4: the secondary control link of busbar voltage
The load power weights assigned calculation method of the step 1, in the present invention with the light comprising two energy-storage units
It is discussed for storage direct-current micro-grid, specific calculation is as follows:
Wherein, PM1、PM2Maximum input (out) power of respectively energy-storage units I and II, p1And p2Respectively energy-storage units I
Tale maximum inputs proportion in (out) power in energy-storage system with II.
Wherein, SOC1、SOC2The respectively state of charge of energy-storage units I and II, s1And s2Respectively energy-storage units I and
The SOC of II proportion, s in the energy-storage system tale SOC in electric discharge link1' and s2' it is respectively energy-storage units I and II
SOC proportion in the energy-storage system tale SOC in charging link.
Wherein, A1、A2The respectively accumulator capacity of energy-storage units I and II, a1And a2Respectively energy-storage units I and II exist
Proportion in energy-storage system tale capacity.
Ab1=kpp1+kss1+kaa1,A′b1=kpp1+kss′1+ka(1-a1) (5)
Ab2=kpp2+kss2+kaa2,A′b2=kpp2+kss′2+ka(1-a2) (6)
Wherein kp,、ksAnd kaPeak power output, SOC and the batteries to store energy unit for respectively indicating energy-storage units hold
Measure the weight that three parameters distribute the influence degree of battery load power distribution by it.Ab1And Ab2It respectively indicates and puts
Electric link energy-storage units I and II press its parameter load power allocation of parameters calculated, Ab1' and Ab2' respectively indicate charging link
Energy-storage units I and II press its parameter load power allocation of parameters calculated.Due to battery maximum charging and discharging capabilities no matter
Be charging link or electric discharge link all should be to be controlled by its peak power output, therefore, this parameter is being filled
Link of discharging is using unified setting.
For kp、ksAnd kaSelection, since final purpose is for the output work of reasonable distribution batteries to store energy unit
Rate prevents the super-charge super-discharge of secondary battery unit, therefore ksIt is relatively large.And due in same direct-current micro-grid, different energy storage lists
Accumulator capacity between member is substantially the same, therefore kaRelatively small, the size relation of three weights is ks>kp>ka。
In addition, corresponding power distribution mode is different for the charging and discharging link of battery.With energy storage list
For the SOC of member, in system operation, for the super-charge super-discharge for avoiding batteries to store energy unit, the biggish energy-storage units of SOC
More loads should be assigned to during electric discharge, and the load distributed during the charging process then wants relatively fewer, for
SOC less energy-storage units are then opposite with the above-mentioned method of salary distribution.It needs to realize thus in charge/discharge different mode using difference
Control strategy, also to realize the automatic switchover of charge and discharge mode, switching method is as described in following step 2.
The switching control of the charge and discharge control link of the step 2 is according to battery two-way voltage conversion in energy-storage units
The direction of inductive current is judged to realize in device, and when the direction of inductive current changes, control mode can also be sent out
It is raw to change.
The step 3 includes following two step
Step 3-1: the sharing of load value and power reference of energy-storage units is calculated
Step 3-2: the load power method of salary distribution based on electric current correction factor
The calculation method of the sharing of load value and power reference of energy-storage units is by taking energy-storage units I as an example in the step 3-1, meter
Load power assigned references value when its charge/discharge is calculated, the calculation method of energy-storage units II is similarly.
Power distribution when energy-storage units I discharges is as follows:
The power distribution of its link that charges is as follows:
The calculation method of electric current correction factor is as follows in the step 3-2:
Wherein kiLFor parameter relevant to inductive current correction factor, value is 2 herein.Load power method of salary distribution tool
Body structure is as shown in Figure 2: load power method of salary distribution specific embodiment is fixed against first in energy-storage units control structure
Increase a load power after a PI controller and distribute link, the control parameter of the link is determined by formula (9).
The secondary control link specific structure expression formula of step 4 busbar voltage are as follows:
eμ|△u| (10)
△ u indicates the difference between busbar voltage actual value and reference value in formula, and μ expression one and voltage fluctuation are to reference
The relevant parameter of electric current influence degree.The specific embodiment of the link is fixed against the load function in energy-storage units control structure
Rate increases a secondary control link after distributing link, and the control parameter of the link is determined by formula (10).
From figure 2 it can be seen that controlling signal by the bidirectional energy-storage converter inductive current that outer voltage control generates
Inductive current reference value required for successively being obtained after load power distributes link, secondary control link.Obtained electric current
Reference value, by second PI controller, it is two-way to then pass through PWM generator generation control compared with actual inductive current
The pwm signal of energy storage converter.
It should be noted that the content is for comprising the light of two energy-storage units storage direct-current micro-grid to the content of present invention
It is illustrated introduction rather than its limitations, is not whole embodiments.Based on the embodiments of the present invention, related technical personnel
All other embodiments obtained without making creative work belong to claim of the invention and protect
The range of shield.
Claims (9)
1. a kind of modified load dynamic allocation method of light storage direct-current micro-grid, it is characterised in that: the method specifically include with
Lower step:
Step 1: load power weights assigned calculation method
Step 2: the switching of charge and discharge control link
Step 3: the load power method of salary distribution based on electric current correction factor
Step 4: the secondary control link of busbar voltage.
2. a kind of modified load dynamic allocation method of light storage direct-current micro-grid according to claim 1, it is characterised in that:
The specific calculation of load power weights assigned calculation method of the step 1 is as follows:
Wherein, PM1、PM2Maximum input (out) power of respectively energy-storage units I and II, p1And p2Respectively energy-storage units I and II
The proportion in tale maximum input (out) power in energy-storage system.
Wherein, SOC1、SOC2The respectively state of charge of energy-storage units I and II, s1And s2Respectively energy-storage units I's and II
SOC proportion, s in the energy-storage system tale SOC in electric discharge link1' and s2' be respectively energy-storage units I and II SOC
The proportion in the energy-storage system tale SOC in charging link.
Wherein, A1、A2The respectively accumulator capacity of energy-storage units I and II, a1And a2Respectively energy-storage units I and II is in energy storage system
Proportion in system tale capacity.
Ab1=kpp1+kss1+kaa1,Ab′1=kpp1+kss′1+ka(1-a1) (5)
Ab2=kpp2+kss2+kaa2,Ab′2=kpp2+kss′2+ka(1-a2) (6)
Wherein kp,、ksAnd kaRespectively indicate peak power output, SOC and the batteries to store energy cell capability three of energy-storage units
The weight that a parameter distributes the influence degree of battery load power distribution by it.Ab1And Ab2Respectively indicate electric discharge ring
It saves energy-storage units I and II and presses its parameter load power allocation of parameters calculated, Ab1' and Ab2' respectively indicate charging link energy storage
Unit I and II press its parameter load power allocation of parameters calculated.Since the maximum charging and discharging capabilities of battery either exist
The link that charges or electric discharge link should be controlled by its peak power output, therefore, for this parameter in charge and discharge
Link is using unified setting.
For kp、ksAnd kaSelection, due to final purpose be for the output power of reasonable distribution batteries to store energy unit,
Prevent the super-charge super-discharge of secondary battery unit, therefore ksIt is relatively large.And due in same direct-current micro-grid, different energy-storage units it
Between accumulator capacity be substantially the same, therefore kaRelatively small, the size relation of three weights is ks>kp>ka。
3. a kind of modified load dynamic allocation method of light storage direct-current micro-grid according to claim 1, it is characterised in that:
The switching control of the charge and discharge control link of the step 2 is according to inductance in battery double-way voltage changer in energy-storage units
Sense of current is judged to realize, when the direction of inductive current changes, control mode can also change.
4. a kind of modified load dynamic allocation method of light storage direct-current micro-grid according to claim 1, it is characterised in that:
The step 3 includes following two step:
Step 3-1: the sharing of load value and power reference of energy-storage units is calculated
Step 3-2: the load power method of salary distribution based on electric current correction factor.
5. a kind of modified load dynamic allocation method of light storage direct-current micro-grid according to claim 1, it is characterised in that:
The calculation method of energy-storage units I sharing of load value and power reference is divided into live part and discharge portion, energy storage in the step 3-1
The calculation method of unit II is similarly.
6. a kind of modified load dynamic allocation method of light storage direct-current micro-grid according to claim 5, it is characterised in that:
Power distribution when energy-storage units I discharges is as follows:
7. a kind of modified load dynamic allocation method of light storage direct-current micro-grid according to claim 5, it is characterised in that:
The power distribution of its link that charges is as follows:
8. a kind of modified load dynamic allocation method of light storage direct-current micro-grid according to claim 1, it is characterised in that:
The calculation method of electric current correction factor is as follows in the step 3-2:
Wherein kiLFor parameter relevant to inductive current correction factor, value is 2 herein.Load power distributes specific embodiment party
Formula increases a load power distribution link, the link after being fixed against first PI controller in energy-storage units control structure
Control parameter determined by formula (9).
9. a kind of modified load dynamic allocation method of light storage direct-current micro-grid according to claim 1, it is characterised in that:
The secondary control link specific structure expression formula of step 4 busbar voltage are as follows:
eμ|△u| (10)
△ u indicates the difference between busbar voltage actual value and reference value in formula, and μ expression one and voltage fluctuation are to reference current
The relevant parameter of influence degree.The specific embodiment of the link is fixed against the load power in energy-storage units control structure point
With a secondary control link is increased after link, the control parameter of the link is determined by formula (10).It is controlled by outer voltage
The bidirectional energy-storage converter inductive current control signal of generation successively obtains after load power distributes link, secondary control link
To required inductive current reference value, obtained current reference value is controlled compared with actual inductive current by second PI
Device processed then passes through the pwm signal that PWM generator generates control bidirectional energy-storage converter.
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