CN104184159A - Co-scheduling strategy for multiple energy storage in distributed light storage micro-gird system - Google Patents
Co-scheduling strategy for multiple energy storage in distributed light storage micro-gird system Download PDFInfo
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- CN104184159A CN104184159A CN201410301770.XA CN201410301770A CN104184159A CN 104184159 A CN104184159 A CN 104184159A CN 201410301770 A CN201410301770 A CN 201410301770A CN 104184159 A CN104184159 A CN 104184159A
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Abstract
Provided is a co-scheduling strategy for multiple energy storage in a distributed light storage micro-gird system. The based multiple energy storage adopts a two-stage converter topology structure comprising a preceding-stage bidirectional DC/DC conversion unit and a back-stage DC/AC conversion unit. A bidirectional DC/DC conversion unit for a storage battery and a bidirectional DC/DC conversion unit for a super capacitor share a DC bus, and are connected with a load and a large power grid through the DC/AC conversion unit and via an LC filter. The co-scheduling method of a two-stage converter for multiple energy storage is characterized by when the distributed light storage micro-gird system is in a grid-connected mode, carrying out double filter control on the two-stage converter for multiple energy storage, controlling the energy-storage element to carry out smooth photovoltaic output power fluctuation, and carrying out adjustment on filtering parameters according to the charge state of the super capacitor and the charge state of a storage battery; and when the distributed light storage micro-gird system is in an off-grid state, controlling the energy-storage element to provide voltage and frequency support to the distributed light storage micro-gird system, the distributed light storage micro-gird system jointly providing power for the load, wherein the energy-storage element is the storage battery and the super capacitor.
Description
Technical field
The present invention relates to a kind of polynary energy storage coordinated dispatching method of distributed light storage micro-grid system.
Background technology
Distributed grid-connected photovoltaic, near user, can solve user power utilization nearby, reduces the dependence of user to mains supply, reduces power network line loss; And under proper condition, coordinate energy-storage system, in conjunction with coordination control strategy, can depart from electrical network and form lonely net independent operating.
When distributed photovoltaic power generation is incorporated into the power networks, can utilize energy-storage system effectively to reduce the negative effect that grid-connected photovoltaic power generation output-power fluctuation causes electrical network, ensure that photovoltaic generation is incorporated to conventional electrical network reliably.Under islet operation pattern, utilize the capability of fast response of energy-storage system, can in the time of load fluctuation, meet the quality of power supply requirement of microgrid operation, also farthest meet the power demand of load.Simultaneously, power-type energy storage device and energy type energy storage device are combined by power circuit, matching coordinative control strategy, form hybrid energy-storing, can make power-type energy storage device and energy type energy storage device realize has complementary advantages, promote the performance of energy-storage system, there is higher using value in occasions such as solving regenerative resource fluctuation.
In domestic and foreign literature, occurred that mixed energy storage system participated in stabilizing power fluctuation under grid-connected condition, from the description that participates in electric voltage frequency control under net condition, but a kind of mixed energy storage system that is applicable to is not proposed, grid-connected and from blanket dispatching method in net.
Summary of the invention
The object of the invention is to overcome the low shortcoming of existing single batteries to store energy power density, propose the cooperative scheduling strategy of polynary energy storage in a kind of distributed light storage micro-grid system.The present invention is according to the advantage of different energy storage technologies, the stage type current transformer topology that a kind of multi-source energy storage is used has been proposed, form polynary energy-storage system by this topological structure, and cooperative scheduling strategy is proposed, make mixed energy storage system at distributed light storage micro-grid system also, under net condition, better play a role.Can make full use of the complementary characteristic that storage battery energy density is high and super capacitor power density is high, optimize the charge and discharge process of storage battery, extend its useful life.
The present invention is by the following technical solutions:
The hybrid energy-storing stage type current transformer of control method of the present invention based on distributed light storage micro-grid system.This hybrid energy-storing comprises the two-way DC/DC converter unit of prime and rear class DC/AC converter unit with the topological structure of stage type current transformer.Storage battery is connected on DC bus with two-way DC/DC converter unit jointly with two-way DC/DC converter unit and super capacitor, and DC bus is received the DC side of DC/AC converter unit again, is connected with load by LC filter with large electrical network.
Described ultracapacitor and storage battery form energy-storage travelling wave tube.The polynary energy storage of the present invention with stage type current transformer coordinated dispatching method is: under the grid-connected pattern of distributed light storage micro-grid system, described stage type current transformer is carried out to double-smoothing control, control energy-storage travelling wave tube for level and smooth photovoltaic output-power fluctuation, and according to ultracapacitor state-of-charge and storage battery charge state, filtering parameter is separately regulated.At distributed light storage micro-grid system, in net situation, controlling energy-storage travelling wave tube provides voltage and frequency to support for distributed light stores up micro-grid system, and distributed light storage micro-grid system is combined for load supplying.
Specific as follows:
(1) it is as follows that described hybrid energy-storing is used the double-smoothing control strategy of stage type current transformer under the grid-connected pattern of distributed light storage micro-grid system:
Definition P
pvfor photovoltaic system power output.Wherein first heavily filtering in order to improve the grid-connected power characteristic of distributed light storage micro-grid system, can adopt low-pass first order filter to realize.This low-pass first order filter expression formula is:
P
1＝P
pv·T
1
Wherein P
1be the first heavy filtering output value, T
1for this first heavy filter parameter.
By through the heavily output valve P of filtering of low-pass first order filter first
1the grid-connected power of the photovoltaic-hybrid energy-storing electricity generation system forming as photovoltaic system and mixed energy storage system, even grid-connected power P
out=P
1, therefore grid-connected power P
outbe the value that photovoltaic system power output is exported after low-pass filtering, its wave characteristic will improve.Regulate the first heavy filter parameter T
1can regulate to photovoltaic system output-power fluctuation characteristic the first heavy filter parameter T
1reduce, the first heavy filter cutoff frequency reduces, and grid-connected power is smooth-out; The first heavy filter parameter T
1increase, the first heavy filter cutoff frequency increases, and it is large that grid-connected power fluctuation becomes.The electrical network of related request according to to(for) photovoltaic electric station grid connection power fluctuation, can determine the first heavy filter parameter T
1maximum of T
1max and minimum value T
1min.
Second heavily filtering is for realizing power reasonable distribution between energy-storage travelling wave tube, and heavily filtering is identical with first, second heavily filtering also photovoltaic system power output is carried out to single order low-pass filtering, this second heavy low-pass first order filter expression formula is:
P
2＝P
pv·T
2
Wherein P
2be the second heavy filtering output value, T
2for this second heavy filter parameter.
Second heavily filtering be heavily on the basis of filtering, energy-storage travelling wave tube to be carried out to power division first, make T
2>=T
1, make second heavily in filtering output, to comprise more high fdrequency component, can obtain thus the compensation power of ultracapacitor
for:
Due to using first heavily the Output rusults of filtering as the grid-connected power of photovoltaic-hybrid energy-storing electricity generation system, therefore the difference between first heavy and the second heavy double filtering is the low frequency part in required compensation power, and the difference between first heavy and the second heavy double filtering is as the set-point of storage battery compensation power
In sum, can be by regulating the second heavy filter parameter T
2adjust the watt level that ultracapacitor is born, by regulating the first heavy filter parameter T
1adjust the watt level that storage battery is born.Work as T
2=T
1time, the parameter of double filter is identical, and ultracapacitor is born all power; As the second heavy filter parameter T
2=1 o'clock, the second heavy filter lost efficacy, and ultracapacitor is not born power, therefore the second heavy filter parameter T
2adjustable range be [T1,1].
Under the grid-connected pattern of distributed light storage micro-grid system, strategy filtering parameter separately being regulated according to ultracapacitor state-of-charge and storage battery charge state is as follows:
The overall compensation power P of known energy-storage travelling wave tube
hes=P
pv– P
out.The state-of-charge of energy-storage travelling wave tube is divided into five regions, for:
0～SOC
min，SOC
min～SOC
low，SOC
low～SOC
high，SOC
high～SOC
max，SOC
max～1。
1, control discharging and recharging of ultracapacitor according to ultracapacitor state-of-charge SOCsc, the state-of-charge SOCsc of ultracapacitor can obtain by the terminal voltage of measuring super capacitor.
1) work as P
hes=0 o'clock, ultracapacitor neither charged and does not also discharge, and distributed light storage micro-grid system is pressed photovoltaic system power output to electrical network delivering power;
2) work as P
heswhen >0, ultracapacitor is in discharge condition, and second weighs filter parameter T
2adjusting be divided into following several situation according to the state-of-charge of ultracapacitor:
If 1. 0<SOCsc<SOCmin, puts phenomenon generation for preventing that ultracapacitor from crossing, now ultracapacitor only charges and does not discharge, therefore the second heavy filter parameter T
2=1;
If 2. SOCmin≤SOCsc<SOClow, now ultracapacitor is in discharge capability deficiency, the state that charging ability is had a surplus, the second heavy filter parameter T
2adjusting become following relationship with state-of-charge:
If 3. SOC
low≤ SOCsc<1,
At SOC
low～SOC
high, SOC
high～SOC
max, SOC
maxin～1 these three regions, ultracapacitor all has stronger discharge capability, and now ultracapacitor is born all power of energy-storage travelling wave tube, i.e. T
2=T
1.
3) in like manner, work as P
heswhen <0, ultracapacitor, in charged state, now second weighs filter parameter T
2adjusting be also divided into following several situation according to the state-of-charge SOCsc of ultracapacitor:
If 1. 0<SOCsc<SOC
high,
At 0～SOC
min, SOC
min～SOC
low, SOC
low～SOC
highthese three region ultracapacitors all have stronger charging ability, therefore T
2=T
1;
If 2. SOC
high≤ SOCsc<SOC
max, in this region ultracapacitor charging ability deficiency, discharge capability is had a surplus, and the second heavy filter parameter T2 changes by following rule according to the state-of-charge SOCsc of super capacitor:
If 3. SOCmax≤SOCsc<1, for preventing that ultracapacitor from overcharging phenomenon and occurring, now should forbid to ultracapacitor charging, therefore T
2=1.
The first described heavy filter is for regulating the grid-connected power of photovoltaic-hybrid energy-storing electricity generation system.
2, when the state-of-charge of ultracapacitor is positioned at interval [SOC
low, SOC
high] outside time, ultracapacitor faces the problem of charge or discharge scarce capacity, now needs to utilize storage battery to supplement Partial Power.And if storage battery continuous discharge or charging, its state-of-charge also can be tending towards 0 or 1, now needs the state-of-charge SOC according to storage battery
batregulate the first heavy filter parameter T
1, prevent that storage battery from overcharging or excessively put phenomenon.The first heavy filter parameter T
1adjustment process as following, the second heavy filter parameter T
2adjustment process and the first heavy filter parameter T
1adjustment process similar.
1) work as P
hes=0 o'clock, T
1constant.
2) work as P
heswhen >0, storage battery is in discharge condition, now T
1adjusting be divided into following several situation according to storage battery charge state SOCbat, the state-of-charge of described storage battery obtains according to the charging and discharging currents of storage battery, adopts special equipment can show in real time the state-of-charge of storage battery:
If 1. 0<SOCbat<SOCmin, puts phenomenon generation for preventing that storage battery from crossing, make T
1=T
1max; T
1maxfor T
1maximum.
If 2. SOCmin≤SOCbat<SOClow, now battery discharging scarce capacity, T
1change by following rule according to storage battery charge state:
If 3. SOClow≤SOCbat<1,
At SOC
low～SOC
high, SOC
high～SOC
max, SOC
max～1 these three regions, storage battery all has stronger discharge capability, therefore T
1=T
1min.T
1minfor T
1minimum value.
3) the same, work as P
heswhen <0, storage battery is in charged state, now to T
1adjusting be divided into following several situation:
If 1. 0<SOCbat<SOChigh,
At 0～SOC
min, SOC
min～SOC
low, SOC
low～SOC
highthese three region storage batterys all have stronger charging ability, therefore T
1=T
1min; T
1minfor T
1minimum value.
If 2. SOChigh≤SOCbat<SOCmax, at this region charge in batteries scarce capacity, T
1sOCbat becomes following relationship with storage battery charge state:
If 3. SOCmax≤SOCbat<1, for avoiding accumulator super-charge phenomenon to occur, now T
1=T
1max.T
1maxfor T
1maximum.
(2) when distributed light stores up micro-grid system islet operation, as follows to the coordination control strategy of energy-storage travelling wave tube:
When distributed light storage micro-grid system islet operation, if between photovoltaic system power stage or load when unbalanced power, described hybrid energy-storing is with in stage type current transformer, and the DC bus-bar voltage being connected with rear class DC/AC converter unit can fluctuate.Because the ultracapacitor in the energy-storage travelling wave tube of storage battery and ultracapacitor composition is power-type energy storage device, power output pace of change is fast, so now super capacitor adopts DC bus-bar voltage outer shroud with two-way DC/DC converter unit, the double-loop control strategy of ring in charging and discharging currents, make the preferential motion compensation power shortage of ultracapacitor, DC bus-bar voltage is regulated simultaneously.Along with the carrying out regulating, DC bus-bar voltage is stabilized to reference value gradually.But the energy density of ultracapacitor own is less, be easy to reach maximum or minimum limit value, the load vacancy that therefore the present invention progressively bears ultracapacitor by a PI control ring is transferred to storage battery, is born the compensation of load vacancy by storage battery.In the time that DC bus-bar voltage is stablized, ultracapacitor is power output no longer, and now the power shortage of distributed light storage micro-grid system net load is all compensated by storage battery, and piconet island net load power is as follows:
P
net-load＝P
load-P
pv＝P
bat
The power shortage of distributed light storage micro-grid system when if storage battery cannot all compensate islet operation, ultracapacitor just need to be born remaining power shortage, to ensure that the quality of power supply of distributed light storage micro-grid system requires and the power demand of load.
It is poor that ultracapacitor power output Psc and power output reference value P*sc do, instantaneous power vacancy while being distributed light storage micro-grid system islet operation, then regulate the power shortage P while obtaining stablizing under distributed light storage micro-grid system isolated island condition by PI control ring
syif, P
sydo not exceed the power limit of storage battery, now the reference value of storage battery power output and P
syequate, if P
syexceeded the power limit of storage battery, storage battery power output is higher limit or lower limit.Wherein the size of the reference value P*sc of the ultracapacitor power output in energy-storage travelling wave tube depends on power shortage P when distributed light storage micro-grid system is stablized
syhigher limit P with storage battery power output
bat_max, lower limit P
bat_min, that is:
Work as P
bat_min≤ P
sy≤ P
bat_maxtime, power shortage P when distributed light storage micro-grid system is stablized
sydo not exceed higher limit or the lower limit of storage battery power output, be that the power shortage of distributed light storage micro-grid system while stablizing all supplied with by storage battery, do not have dump power, super capacitor does not need to participate in power adjustments, and now the power stage reference value of super capacitor is:
P
sc_ref＝0
Work as P
sy< P
bat_min< 0 or P
sy> P
bat_maxwhen > 0, power shortage P when distributed light storage micro-grid system is stablized
syexceed higher limit or the lower limit of storage battery power output, storage battery cannot charge or discharge, and now distributed light storage micro-grid system exists dump power, needs super capacitor to participate in power adjustments, compensate for residual power, that is:
P
sc_ref＝P
sy-(P
bat_max,P
bat_min)。
3, in sum, as follows with the control strategy of stage type current transformer to described hybrid energy-storing:
In the time that distributed light storage micro-grid system is incorporated into the power networks, described hybrid energy-storing is adopted to power control with the two-way DC/DC converter unit of storage battery and the two-way DC/DC converter unit of super capacitor of stage type current transformer, rear class DC/AC converter unit is adopted to DC bus-bar voltage outer shroud, the double-loop control strategy of ring in grid-connected current.Concrete control flow is as follows: the set-point P of the storage battery compensation power obtaining by double-smoothing control strategy
* batreference value P with ultracapacitor power output
* scdivided by the terminal voltage of storage battery and super capacitor, can obtain the active current set-point I of storage battery respectively
* batactive current set-point I with ultracapacitor
* sc, by the active current set-point I of storage battery
* batactive current set-point I with ultracapacitor
* screspectively with the accumulator cell charging and discharging electric current I of surveying
batsuper capacitor charging and discharging currents I with actual measurement
scit is poor to do, and after PI link regulates, then modulates the switching signal that obtains respectively the two-way DC/DC converter unit of storage battery and the two-way DC/DC converter unit of super capacitor through PWM; The now primary effect of net side converter is the voltage of controlling DC bus, and the command value of reactive power sets to 0.The command value U of DC bus-bar voltage
* dcwith actual value U
dcdo after difference, obtain the given I of d axle active current through pi regulator
* d, the given I of d axle active current
* d, then with actual d shaft current I
dit is poor to do, and after PI regulates, again through decoupling zero control, has just obtained d axle active voltage command value U
* d.It is exactly directly the set-point of q shaft current that reactive power is herein set, the set-point of q shaft current by with actual value I
qit is poor to do, and after PI, has just obtained q axle reactive voltage command value U again through decoupling zero control
* q.Dq shaft voltage command value has obtained abc three-phase voltage reference wave after rotation transformation, switching signal that just can controlled net side converter switching tube by SPWM algorithm.
Under distributed light storage micro-grid system islet operation condition, be still power control to storage battery with two-way DC/DC converter unit, and super capacitor is adopted to the double-loop control strategy encircling in DC bus-bar voltage outer shroud, charging and discharging currents with two-way DC/DC converter unit.Concrete control flow is as follows: gather DC bus-bar voltage actual value Udc and DC bus-bar voltage command value U*dc and do after difference, obtain the set-point I*sc of super capacitor charging and discharging currents through pi regulator, it is poor that the super capacitor charging and discharging currents Isc of the set-point I*sc of super capacitor charging and discharging currents and actual measurement is done, after PI link, then obtain the switching signal of super capacitor with two-way DC/DC converter unit through PWM modulation.Now rear class DC/AC converter unit adopts V/f control strategy, and control method is for gathering stage type current transformer load side voltage U
l, obtaining component of voltage ULd, the ULq under dq reference axis through coordinate transform, component of voltage ULd, the ULq under dq reference axis does poorly with set-point ULdref, the ULqref of ULd, ULq respectively, obtains current inner loop set-point I through PI compensation tache
*d, I
*q.Gather the filter inductance current i in the LC filter adopting in stage type current transformer rear class DC/AC converter unit, obtain current component id, the iq under dq reference axis through coordinate transform, current component id, the iq under dq reference axis respectively with current inner loop set-point I
*d, I
*q does poor, through PI compensation tache and Feedforward Decoupling link, obtains voltage reference value
through coordinate inverse transformation and PWM modulation link, get final product the cut-off signals of opening of controlled net side converter switching tube, thereby ensured the constant of output voltage amplitude and frequency.
Brief description of the drawings
The topology diagram of Fig. 1 current transformer of the present invention;
The heavy filter parameter T of Fig. 2 second
2regulate flow chart;
The heavy filter parameter T of Fig. 3 first
1regulate flow chart;
Fig. 4 control strategy figure that is incorporated into the power networks;
Fig. 5 islet operation control strategy figure.
Embodiment
Below in conjunction with figure and embodiment the invention will be further described.
The hybrid energy-storing that Fig. 1 adopts for the inventive method topological structure of stage type current transformer.This hybrid energy-storing comprises the two-way DC/DC converter unit of prime and rear class DC/AC converter unit with stage type current transformer.Two-way DC/DC converter unit and two-way DC/DC converter unit common DC bus for super capacitor for storage battery, storage battery is first connected respectively the two-way DC/DC converter unit of storage battery and two-way DC/DC converter unit for super capacitor with super capacitor, and then connection DC/AC converter unit, connect ac bus by DC/AC converter unit, then be connected with large electrical network with load through LC filter.
Fig. 2 is the second heavy filter parameter T
2regulate flow chart, work as P
heswhen >0, ultracapacitor is in discharge condition, and second weighs filter parameter T
2adjusting be divided into following several situation according to super capacitor state-of-charge SOCsc:
If 1. 0<SOCsc<SOCmin, puts phenomenon generation for preventing that ultracapacitor from crossing, now ultracapacitor only charges and does not discharge, therefore T
2=1;
If 2. SOCmin≤SOCsc<SOClow, now ultracapacitor is in discharge capability deficiency, the state that charging ability is had a surplus, and the adjusting of T2 becomes following relationship with state-of-charge:
If 3. SOC
low≤ SOCsc<1,
At SOC
low～SOC
high, SOC
high～SOC
max, SOC
max～1 these three regions, ultracapacitor all has stronger discharge capability, and now ultracapacitor is born all power of energy-storage travelling wave tube, i.e. T2=T1.
Work as P
heswhen <0, ultracapacitor is in charged state, now T
2adjusting be also divided into following several situation according to ultracapacitor state-of-charge:
If 1. 0<SOCsc<SOChigh,
At 0～SOC
min, SOC
min～SOC
low, SOC
low～SOC
highthese three region ultracapacitors all have stronger charging ability, therefore T
2=T
1;
If 2. SOChigh≤SOCsc<SOCmax, in this region ultracapacitor charging ability deficiency, discharge capability is had a surplus, T
2change by following rule according to ultracapacitor state-of-charge:
If 3. SOCmax≤SOCsc<1, for preventing that ultracapacitor from overcharging phenomenon and occurring, now should forbid to ultracapacitor charging, therefore T
2=1.
Fig. 3 is the first heavy filter parameter T
1regulate flow chart.Work as P
heswhen >0, storage battery is in discharge condition, now T
1adjusting be divided into following several situation according to storage battery charge state:
If 1. 0<SOCbat<SOCmin, puts phenomenon generation for preventing that storage battery from crossing, make T
1=T
1max; T
1maxfor T
1maximum.
If 2. SOCmin≤SOCbat<SOClow, now battery discharging scarce capacity, T
1change by following rule according to storage battery charge state:
If 3. SOClow≤SOCbat<1,
At SOC
low～SOC
high, SOC
high～SOC
max, SOC
max～1 these three regions, storage battery all has stronger discharge capability, therefore T
1=T
1min.T
1minfor T
1minimum value.
Work as P
heswhen <0, storage battery is in charged state, now to T
1adjusting be divided into following several situation:
If 1. 0<SOCbat<SOChigh,
At 0～SOC
min, SOC
min～SOC
low, SOC
low～SOC
highthese three region storage batterys all have stronger charging ability, therefore T
1=T
1min; T
1minfor T
1minimum value.
If 2. SOChigh≤SOCbat<SOCmax, at this region charge in batteries scarce capacity, T
1become following relationship with state-of-charge:
If 3. SOCmax≤SOCbat<1, for avoiding accumulator super-charge phenomenon to occur, now T
1=T
1max.T
1maxfor T
1maximum.
Fig. 4 is distributed light storage micro-grid system control strategy figure to hybrid energy-storing stage type current transformer while being incorporated into the power networks.As shown in Figure 4, by the active power set-point P of the storage battery obtaining by double-smoothing control strategy and super capacitor
* batwith P
* scdivided by the terminal voltage of storage battery and super capacitor, can obtain active current set-point I respectively
* batwith I
* sc, by the active current set-point I of storage battery
* batactive current set-point I with ultracapacitor
* screspectively with the accumulator cell charging and discharging electric current I of surveying
batsuper capacitor charging and discharging currents I with actual measurement
scit is poor to do, and after PI link, then modulates the switching signal that obtains respectively the two-way DC/DC converter unit of storage battery and the two-way DC/DC converter unit of super capacitor through PWM; The now primary effect of net side converter is exactly the voltage of controlling DC bus, and the command value of reactive power sets to 0.The command value U of DC bus-bar voltage
* dcwith actual value U
dcdo after difference, obtain the given I of d axle active current through pi regulator
* d, the given I of d axle active current
* dagain with actual d shaft current I
dit is poor to do, and after PI regulates, again through decoupling zero control, has just obtained d axle active voltage command value U
* d.It is exactly directly the set-point of q shaft current that reactive power is herein set, by q shaft current set-point and actual value I
qit is poor to do, and after PI, has more just obtained q axle reactive voltage command value U through decoupling zero control
* q.Dq shaft voltage command value has obtained abc three-phase voltage reference wave after rotation transformation, switching signal that just can controlled net side converter by SPWM algorithm.
Fig. 5 is that distributed light storage micro-grid system islet operation is to hybrid energy-storing stage type current transformer control strategy figure.Concrete control flow is as follows: as shown in Figure 5, gathering DC bus-bar voltage actual value Udc and instruction value U*dc does after difference, obtain the set-point I*sc of super capacitor charging and discharging currents through pi regulator, it is poor that the super capacitor charging and discharging currents Isc of the set-point I*sc of super capacitor charging and discharging currents and actual measurement is done, after PI link, then obtain the switching signal of super capacitor with two-way DC/DC converter unit through PWM modulation.Now rear class DC/AC converter unit adopts V/f control strategy, and control flow is for gathering load side voltage U
l, obtaining component of voltage ULd, the ULq under dq reference axis through coordinate transform, component of voltage ULd, the ULq under dq reference axis does poorly with set-point ULdref, ULqref respectively, obtains current inner loop set-point I through PI compensation tache
*d, I
*q.Gather filter inductance current i, obtain current component id, the iq under dq reference axis through coordinate transform, current component id, the iq under dq reference axis respectively with I
*d, I
*q does poor, through PI compensation tache and Feedforward Decoupling link, obtains voltage reference value
voltage reference value
through coordinate inverse transformation and PWM modulation link, can obtain the cut-off signals of opening of net side converter switching tube, thereby ensure the constant of output voltage amplitude and frequency with this Signal-controlled switch pipe.
Claims (6)
1. a cooperative scheduling strategy for polynary energy storage in light storage distributed micro-grid system, based on polynary energy storage comprise the two-way DC/DC converter unit of prime and rear class DC/AC converter unit by stage type converter topologies, two-way DC/DC converter unit and two-way DC/DC converter unit common DC bus for super capacitor for storage battery, then be connected with load and large electrical network through LC filter by DC/AC converter unit, it is characterized in that, to described polynary energy storage by the method for stage type current transformer cooperative scheduling be: distributed light storage micro-grid system is under grid-connected pattern, described polynary energy storage is carried out to double-smoothing control with stage type current transformer, control energy-storage travelling wave tube for level and smooth photovoltaic output-power fluctuation, and according to ultracapacitor state-of-charge and storage battery charge state, filtering parameter is separately regulated, distributed light storage micro-grid system is in net situation, and controlling energy-storage travelling wave tube provides voltage and frequency to support for distributed light stores up micro-grid system, and distributed light storage micro-grid system is combined for load supplying, described energy-storage travelling wave tube is storage battery and ultracapacitor.
2. the cooperative scheduling strategy of polynary energy storage in light storage distributed micro-grid system according to claim 1, is characterized in that, described distributed light storage micro-grid system to polynary energy storage with the double-smoothing control strategy of stage type current transformer is under grid-connected pattern:
1) first heavily filtering in order to the grid-connected power characteristic of improvement system, adopt low-pass first order filter filtering, low-pass first order filter expression formula is:
P
1＝P
pv·T
1
Wherein: P
pvfor photovoltaic system power output, P
1be the first heavy filtering output value, T
1for this first heavy filter parameter;
By the first heavy filtering output value P
1as the grid-connected power of photovoltaic-hybrid energy-storing electricity generation system of photovoltaic system and mixed energy storage system composition, even P
out=P
1, therefore grid-connected power P out is the value of photovoltaic system power output after low-pass filtering, the wave characteristic of photovoltaic system improves;
Regulate the first heavy filter parameter T
1photovoltaic system output-power fluctuation characteristic is regulated: T
1reduce, the first heavy filter cutoff frequency reduces, and grid-connected power is smooth-out; T
1increase, the first heavy filter cutoff frequency increases, and it is large that grid-connected power fluctuation becomes;
2) second heavily filtering realize the power division between energy-storage travelling wave tube, heavily filtering is identical with first, second heavily filtering also photovoltaic system power output is carried out to single order low-pass filtering, this second heavy low-pass first order filter expression formula is:
P
2＝P
pv·T
2
Wherein: P
pvfor photovoltaic system power output, P
2be the second heavy filtering output value, T
2it is the second heavy filter parameter;
Second heavily filtering be heavily to carry out power division between to energy-storage travelling wave tube on the basis of filtering first, make T
2>=T
1, make second heavily in filtering output, to comprise more high fdrequency component, can obtain thus the compensation power of ultracapacitor
for:
Because using first, heavily the Output rusults of filtering is as the grid-connected power of distributed light storage micro-grid system, therefore the difference between first heavy and the second heavy double filtering is the low frequency part in required compensation power, the set-point using this difference as storage battery compensation power
Therefore can be by regulating T
2adjust the watt level that ultracapacitor is born, by regulating T
1adjust the watt level that storage battery is born; Work as T
2=T
1time, double filtering is consistent, and ultracapacitor is born all power; Work as T
2=1 o'clock, filter lost efficacy, and ultracapacitor is not born power, therefore T
2adjustable range be [T
1, 1].
3. the cooperative scheduling strategy of polynary energy storage in light storage distributed micro-grid system according to claim 1, it is characterized in that, under the grid-connected pattern of described distributed light storage micro-grid system, strategy filtering parameter separately being regulated according to ultracapacitor state-of-charge and storage battery charge state is as follows:
The overall compensation power P of known energy-storage travelling wave tube
hes=P
pv– P
out, the state-of-charge of energy-storage travelling wave tube is divided into five regions:
0～SOC
min，SOC
min～SOC
low，SOC
low～SOC
high，SOC
high～SOC
max，SOC
max～1；
(1) control discharging and recharging of ultracapacitor according to ultracapacitor state-of-charge SOCsc, the state-of-charge SOCsc of ultracapacitor obtains by the terminal voltage of measuring super capacitor:
1) work as P
hes=0 o'clock, ultracapacitor neither charged and does not also discharge, and distributed light storage micro-grid system is pressed photovoltaic system power output to electrical network delivering power;
2) work as P
heswhen >0, ultracapacitor is in discharge condition, and second weighs filter parameter T
2adjusting be divided into following several situation according to the state-of-charge of ultracapacitor:
If 1. 0<SOCsc<SOCmin, puts phenomenon generation for preventing that ultracapacitor from crossing, now ultracapacitor only charges and does not discharge, therefore the second heavy filter parameter T
2=1;
If 2. SOCmin≤SOCsc<SOClow, now ultracapacitor is in discharge capability deficiency, the state that charging ability is had a surplus, the second heavy filter parameter T
2adjusting become following relationship with state-of-charge:
If 3. SOC
low≤ SOCsc<1,
At SOC
low～SOC
high, SOC
high～SOC
max, SOC
maxin～1 these three regions, ultracapacitor all has stronger discharge capability, and now ultracapacitor is born all power of energy-storage travelling wave tube, i.e. T
2=T
1;
3) in like manner, work as P
heswhen <0, ultracapacitor, in charged state, now second weighs filter parameter T
2adjusting be divided into following several situation according to the state-of-charge SOCsc of ultracapacitor:
If 1. 0<SOCsc<SOC
high,
At 0～SOC
min, SOC
min～SOC
low, SOC
low～SOC
highthese three region ultracapacitors all have stronger charging ability, therefore T
2=T
1;
If 2. SOC
high≤ SOCsc<SOC
max, in this region ultracapacitor charging ability deficiency, discharge capability is had a surplus, the second heavy filter parameter T
2change by following rule according to the state-of-charge SOCsc of super capacitor:
If 3. SOCmax≤SOCsc<1, for preventing that ultracapacitor from overcharging phenomenon and occurring, now should forbid to ultracapacitor charging, therefore T
2=1;
(2) when the state-of-charge of ultracapacitor is positioned at interval [SOC
low, SOC
high] outside time, ultracapacitor faces the problem of charge or discharge scarce capacity, now needs to utilize storage battery to supplement Partial Power; If storage battery continuous discharge or charging, its state-of-charge also can be tending towards 0 or 1, now needs the state-of-charge SOC according to storage battery
batregulate the first heavy filtering parameter device T
1, prevent that storage battery from overcharging or excessively put phenomenon; The first heavy filter parameter T
1adjustment process as follows, the second heavy filter parameter T
2adjustment process and the first heavy filter parameter T
1adjustment process similar:
1) work as P
hes=0 o'clock, T
1constant;
2) work as P
heswhen >0, storage battery is in discharge condition, now T
1adjusting be divided into following several situation according to state-of-charge:
If 1. 0<SOC
bat<SOC
min, put phenomenon generation for preventing that storage battery from crossing, make T
1=T
1max; T
1maxfor T
1maximum;
If 2. SOC
min≤ SOC
bat<SOC
low, now battery discharging scarce capacity, according to storage battery charge state T
1change by following rule:
If 3. SOC
low≤ SOC
bat<1,
At SOC
low～SOC
high, SOC
high～SOC
max, SOC
max～1 these three regions, storage battery all has stronger discharge capability, therefore T
1=T
1min; T
1minfor T
1minimum value;
3) the same, work as P
heswhen <0, storage battery is in charged state, now to T
1adjusting be divided into following several situation:
If 1. 0<SOCbat<SOChigh,
At 0～SOC
min, SOC
min～SOC
low, SOC
low～SOC
highthese three region storage batterys all have stronger charging ability, therefore T
1=T
1min; T
1minfor T
1minimum value;
If 2. SOChigh≤SOCbat<SOCmax, at this region charge in batteries scarce capacity, T
1sOCbat becomes following relationship with storage battery charge state:
If 3. SOCmax≤SOCbat<1, for avoiding accumulator super-charge phenomenon to occur, now T
1=T
1max, T
1maxfor T
1maximum.
4. the cooperative scheduling strategy of polynary energy storage in light storage distributed micro-grid system according to claim 1, it is characterized in that, described distributed light storage micro-grid system is in net situation, and controlling energy-storage travelling wave tube provides the method for voltage and frequency support as follows for distributed light stores up micro-grid system:
When distributed light storage micro-grid system islet operation, if unbalanced power between photovoltaic system power stage or load, described hybrid energy-storing is with in stage type current transformer, and the DC bus-bar voltage being connected with rear class DC/AC converter unit can fluctuate; Now super capacitor adopts DC bus-bar voltage outer shroud with two-way DC/DC converter unit, and in charging and discharging currents, the double-loop control strategy of ring, makes the preferential motion compensation power shortage of ultracapacitor, DC bus-bar voltage is regulated simultaneously; Along with the carrying out regulating, DC bus-bar voltage is stabilized to reference value gradually; The load vacancy of now progressively super capacitor being born by a PI control ring is transferred to storage battery, is born the compensation of load vacancy by storage battery; In the time that DC bus-bar voltage is stablized, ultracapacitor is power output no longer, and now the power shortage of distributed light storage micro-grid system net load is all compensated by storage battery, piconet island net load power P
net-loadfor:
P
net-load＝P
load-P
pv＝P
bat
The power shortage of distributed light storage micro-grid system when if storage battery cannot all compensate islet operation, ultracapacitor need to be born remaining power shortage, to ensure that the quality of power supply of distributed light storage micro-grid system requires and the power demand of load;
It is poor that ultracapacitor power output Psc and power output reference value P*sc do, instantaneous power vacancy while being distributed light storage micro-grid system islet operation, then regulate the power shortage P while obtaining stablizing under distributed light storage micro-grid system isolated island condition by PI control ring
syif, described power shortage P
sydo not exceed the power limit of storage battery, now the reference value of storage battery power output and described power shortage P
syequate, if described power shortage P
syexceeded the power limit of storage battery, storage battery power output is higher limit or lower limit; The size of the reference value P*sc of ultracapacitor power output depends on power shortage P when distributed light storage micro-grid system is stablized
syhigher limit P with storage battery power output
bat_max, lower limit P
bat_min, that is:
Work as P
bat_min≤ P
sy≤ P
bat_maxtime, power shortage P when distributed light storage micro-grid system is stablized
sydo not exceed higher limit or the lower limit of storage battery power output, be that the power shortage of distributed light storage micro-grid system while stablizing all supplied with by storage battery, do not have dump power, ultracapacitor does not need to participate in power adjustments, and now the power stage reference value of super capacitor is:
P
sc_ref＝0
Work as P
sy< P
bat_min< 0 or P
sy> P
bat_maxwhen > 0, power shortage P when distributed light storage micro-grid system is stablized
syexceed higher limit or the lower limit of storage battery power output, storage battery cannot charge or discharge, and now distributed light storage micro-grid system exists dump power, needs ultracapacitor to participate in power adjustments, compensate for residual power, that is:
P
sc_ref＝P
sy-(P
bat_max,P
bat_min)。
5. the control strategy of stage type current transformer for hybrid energy-storing according to claim 1, is characterized in that, as follows to described distributed light storage micro-grid system implementation procedure of control strategy in the time being incorporated into the power networks:
Hybrid energy-storing is all adopted to power control with storage battery and the super capacitor of stage type current transformer with two-way DC/DC converter unit, and rear class DC/AC converter unit adopts the double-loop control strategy of ring in the outer outer shroud of DC bus-bar voltage, grid-connected current; Concrete control flow is as follows:
The set-point P of the storage battery compensation power obtaining by double-smoothing control strategy
* batreference value P with ultracapacitor power output
* scdivided by the terminal voltage of storage battery and super capacitor, can obtain the active current offset I of storage battery respectively
* batactive current set-point I with ultracapacitor
* sc, by the active current offset I of storage battery
* bataccumulator cell charging and discharging electric current I with actual measurement
batit is poor to do, by the active current set-point I of ultracapacitor
* scsuper capacitor charging and discharging currents I with actual measurement
scit is poor to do, and after PI link, then modulates the switching signal that obtains respectively the two-way DC/DC converter unit of storage battery and the two-way DC/DC converter unit of super capacitor through PWM; The now primary effect of net side converter is the voltage of controlling DC bus, and the command value of reactive power sets to 0; The command value U of DC bus-bar voltage
* dcwith actual value U
dcafter doing difference, obtain the given I of d axle active current through pi regulator
* d, then with actual d shaft current I
dit is poor to do, and after PI regulates, again through decoupling zero control, obtains d axle active voltage command value U
* d; It is the set-point of q shaft current that reactive power is set, the set-point of q shaft current and actual value I
qit is poor to do, and after PI, obtains q axle reactive voltage command value U again through decoupling zero control
* q; Dq shaft voltage command value obtains abc three-phase voltage reference wave after rotation transformation, by the switching signal of the controlled net side converter of SPWM algorithm.
6. the control strategy of stage type current transformer for hybrid energy-storing according to claim 1, is characterized in that, as follows in the implementation procedure of control strategy in net situation to described distributed light storage micro-grid system:
Under distributed light storage micro-grid system islet operation condition, be still power control to hybrid energy-storing with the two-way DC/DC converter unit of storage battery of stage type current transformer, super capacitor is adopted to the double-loop control strategy encircling in DC bus-bar voltage outer shroud, charging and discharging currents with two-way DC/DC converter unit, concrete control flow is as follows:
Gathering DC bus-bar voltage actual value Udc and instruction value U*dc does after difference, obtain the set-point I*sc of ultracapacitor charging and discharging currents through pi regulator, it is poor that the super capacitor charging and discharging currents Isc of the set-point I*sc of ultracapacitor charging and discharging currents and actual measurement is done, after PI link, through PWM modulation, obtain the switching signal of super capacitor with two-way DC/DC converter unit again; Now rear class DC/AC converter unit is adopted to V/f control strategy, control flow is: gather load side voltage U
l, obtaining component of voltage ULd, the ULq under dq reference axis through coordinate transform, component of voltage ULd, the ULq under dq reference axis does poorly with set-point ULdref, the ULqref of ULd, ULq respectively, obtains current inner loop set-point I through PI compensation tache
*d, I
*q; Gather filter inductance current i, obtain current component id, the iq under dq reference axis through coordinate transform, current component id, the iq under dq reference axis respectively with current inner loop set-point I
*d, I
*q does poor, through PI compensation tache and Feedforward Decoupling link, obtains voltage reference value
through coordinate inverse transformation and PWM modulation link, can obtain the cut-off signals of opening of net side converter switching tube, thereby ensure the constant of output voltage amplitude and frequency.
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