CN106208113B - A kind of hybrid energy-storing hierarchical coordinative control method based on state-of-charge - Google Patents

A kind of hybrid energy-storing hierarchical coordinative control method based on state-of-charge Download PDF

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CN106208113B
CN106208113B CN201610547090.5A CN201610547090A CN106208113B CN 106208113 B CN106208113 B CN 106208113B CN 201610547090 A CN201610547090 A CN 201610547090A CN 106208113 B CN106208113 B CN 106208113B
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charge
power
hybrid energy
bus
state
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CN106208113A (en
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李辉
黄瑶妹
彭道刚
夏飞
马飞
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Shanghai University of Electric Power
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Shanghai University of Electric Power
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28Arrangements for balancing of the load in a network by storage of energy
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/345Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices

Abstract

The present invention relates to a kind of hybrid energy-storing hierarchical coordinative control method based on state-of-charge, the control of micro-capacitance sensor for the energy-storage units containing mixing, hybrid energy-storing unit includes accumulator and super capacitor, accumulator and super capacitor are connected to DC bus by DC/DC converters respectively, DC bus is connected to micro-capacitance alternating current bus by DC/AC converters, and this method comprises the following steps:It obtains micro-capacitance alternating current bus voltage, ac bus frequency and hybrid energy-storing unit comprehensive state-of-charge progress upper layer power optimization to control to obtain the output power instruction of DC/AC converters, and then controls the work of DC/AC converters;DC bus-bar voltage is obtained, lower layer's power distribution is carried out by target of stable DC busbar voltage, respectively obtains the charge-discharge electric power instruction of accumulator and super capacitor, and then controls corresponding DC/DC converters work.Compared with prior art, the present invention can effectively prevent overcharging or putting excessively for hybrid energy-storing battery.

Description

A kind of hybrid energy-storing hierarchical coordinative control method based on state-of-charge
Technical field
The present invention relates to a kind of hybrid energy-storing control methods, more particularly, to a kind of hybrid energy-storing based on state-of-charge point Layer control method for coordinating.
Background technology
In recent years, with the fast development of regenerative resource, people propose micro-capacitance sensor reliability, stability higher It is required that.The problems such as in order to improve the power-balance in micro-grid system, stability and power quality, it is more steady to be equipped with output power Fixed energy storage device is one of the effective means for inhibiting power pulsations, and energy-storage system, which has, quickly to be absorbed and discharge in a short time The characteristics of energy, thus can, fluctuation intermittent efficiently against regenerative resource output power the shortcomings that.It is passed to make up It unites the deficiency of single energy storage device, the hybrid energy-storing unit using power type super capacitor and energy type accumulator is to store up at present Can technology one of developing direction, ultracapacitor has that fast response time, high-power fan-out capability be strong, energy conversion efficiency High, the features such as having extended cycle life, be typical power-type energy storage device.Ultracapacitor can be substantially with accumulator coordinated operation Degree improves the peak power I/O capability of energy storage device, reduces internal loss, reduces the charge and discharge number of accumulator, to Improve the service life of equipment.Therefore hybrid energy-storing is applied to renewable power supply system, there is larger technology economy advantage.
Many researchers have important achievement in terms of hybrid energy-storing control technology at present.ASAO T propose to use low pass Special frequency channel component in the method compensation wind power of filtering, but the state-of-charge (SOC) due to not considering energy storage device, hold Easily cause equipment super-charge super-discharge.
Invention content
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide one kind being based on state-of-charge Hybrid energy-storing hierarchical coordinative control method.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of hybrid energy-storing hierarchical coordinative control method based on state-of-charge, the micro-capacitance sensor for the energy-storage units containing mixing Control, the hybrid energy-storing unit includes accumulator and super capacitor, and the accumulator and super capacitor pass through respectively DC/DC converters are connected to DC bus, and DC bus is connected to micro-capacitance alternating current bus, this method by DC/AC converters Include the following steps:
(1) micro-capacitance alternating current bus voltage U, ac bus frequency f and hybrid energy-storing unit comprehensive state-of-charge are obtained SOCHESS, according to U, f and SOCHESSIt carries out upper layer power optimization to control to obtain the output power instruction of DC/AC converters, and then controls DC/AC converters work processed;
(2) DC bus-bar voltage V is obtaineddc, lower layer's power distribution is carried out by target of stable DC busbar voltage, respectively It is instructed to the charge-discharge electric power of accumulator and super capacitor, and then controls corresponding DC/DC converters work.
Power optimization control obtains step (1) especially by fuzzy logic algorithm at the middle and upper levels, specifically includes:
(101) by ac bus frequency f and ac bus rated frequency frefDeviation adjust to obtain active power through PI and lack Volume value Pref, while by the rated voltage U of ac bus voltage U and ac busrefDeviation adjust to obtain reactive power through PI Vacancy value Qref
(102) by hybrid energy-storing unit comprehensive state-of-charge SOCHESSWith active power shortage value PrefPass through as input Fuzzy logic algorithm obtains active power correction value Δ P, while by hybrid energy-storing unit comprehensive state-of-charge SOCHESSWith it is idle Power shortage value QrefAs input reactive power correction value Δ Q is obtained by fuzzy logic algorithm;
(103) to active power shortage value PrefIt sums to obtain the output of DC/AC converters with active power correction value Δ P Active power instructs P 'ref, to reactive power vacancy value QrefIt sums to obtain DC/AC converters with reactive power correction value Δ Q Output reactive power instructs Q 'ref
The hybrid energy-storing unit comprehensive state-of-charge SOCHESSIt is obtained by following formula:
Wherein, QVRLAB、QSCThe respectively rated capacity of accumulator and super capacitor, SOCVRLAB、SOCSCRespectively accumulator With the state-of-charge of super capacitor.
The step (2) specifically includes:
(201) by DC bus rated voltage VrefWith DC bus-bar voltage VdcDeviation adjust to obtain hybrid energy-storing through PI The charge-discharge electric power P of unitHESS
(202) by the charge-discharge electric power P of hybrid energy-storing unitHESSIt filters to obtain low frequency component and make by low-pass filter For accumulator cell charging and discharging power instruction Pbat, while instructing P using high fdrequency component as super capacitor charge-discharge electric powersc
Obtain accumulator cell charging and discharging power instruction PbatP is instructed with super capacitor charge-discharge electric powerscAfter also need to carry out it It corrects, specially:
(a) charge and discharge corrected output Δ P ' is sought according to the following formula:
Δ P '=(SOCSC-SOCVRLAB)×|PHESS| × β,
Wherein, SOCVRLAB、SOCSCThe respectively state-of-charge of accumulator and super capacitor, PHESSFor hybrid energy-storing unit Charge-discharge electric power, β are correction factor, and β value ranges are 1.1~1.3;
(b) calculating accumulator charge-discharge electric power instruction correction value P 'bat:P′bat=Pbat+ Δ P ' calculates super capacitor charge and discharge Electrical power instructs correction value P 'sc:P′sc=Psc-ΔP′;
In turn by accumulator cell charging and discharging power instruction correction value P 'batAs accumulator cell charging and discharging power instruction, by super electricity Hold charge-discharge electric power instruction correction value P 'scIt is instructed as super capacitor charge-discharge electric power, to control corresponding DC/DC converters Work.
Compared with prior art, the invention has the advantages that:
(1) present invention carries out considering hybrid energy-storing unit comprehensive state-of-charge when the control of upper layer power optimization SOCHESS, to ensure that overcharging or putting excessively for hybrid energy-storing unit while stablizing ac bus voltage and frequency, ensure The safety of energy-storage system;
(2) high frequency power is distributed to super electricity by lower layer's power distribution of the invention by low-pass filter filtering mode Hold, low frequency power distributes to accumulator, greatly played the advantage of two kinds of energy-storage travelling wave tubes of accumulator and super capacitor;
(3) present invention also carries out power in progress lower layer power distribution by the state-of-charge of accumulator and super capacitor Correct, when the state-of-charge of two energy-storage travelling wave tubes relatively when, corrected output Δ P ' values are smaller, i.e. the amendment of work done rate Smaller, when the state-of-charge of two energy-storage travelling wave tubes difference is bigger, the value of corrected output Δ P ' is bigger, i.e. work done Rate amendment is just bigger, so that the state-of-charge of two kinds of energy-storage travelling wave tubes is opposite to keep an equilibrium state, prevents some Energy-storage travelling wave tube, which is overcharged or crossed, puts phenomenon, extends the service life of energy-storage travelling wave tube.
Description of the drawings
Fig. 1 is the structure diagram of the micro-capacitance sensor of the energy-storage units containing mixing;
Fig. 2 is the control block diagram of upper layer power optimization control;
Fig. 3 is the control block diagram of lower layer's power distribution;
Fig. 4 is hybrid energy-storing unit comprehensive state-of-charge SOCHESSCurve comparison figure;
Fig. 5 is super capacitor state-of-charge SOCSCCurve comparison figure;
Fig. 6 is storage battery charge state SOCVRLABCurve comparison figure;
Wherein 1 is accumulator, and 2 be super capacitor, and 3 be the first DC/DC converters, and 4 be the 2nd DC/DC converters, and 5 are DC/AC converters.
Specific implementation mode
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment
A kind of hybrid energy-storing hierarchical coordinative control method based on state-of-charge, the micro-capacitance sensor for the energy-storage units containing mixing Control, as shown in Figure 1 for weldering hybrid energy-storing unit micro-capacitance sensor structure diagram, hybrid energy-storing unit includes 1 He of accumulator Super capacitor 2, accumulator 1 and super capacitor 2 are connected to DC bus by DC/DC converters respectively, i.e., the first DC/DC in figure Converter 3 and the 2nd DC/DC converters 4, DC bus is connected to micro-capacitance alternating current bus by DC/AC converters 5, wherein storing Battery 1 uses ferric phosphate lithium cell.
The present invention is based on the hybrid energy-storing hierarchical coordinative control methods of state-of-charge to include the following steps:
(1) micro-capacitance alternating current bus voltage U, ac bus frequency f and hybrid energy-storing unit comprehensive state-of-charge are obtained SOCHESS, according to U, f and SOCHESSIt carries out upper layer power optimization to control to obtain the output power instruction of DC/AC converters, and then controls DC/AC converters work processed;
(2) DC bus-bar voltage V is obtaineddc, lower layer's power distribution is carried out by target of stable DC busbar voltage, respectively It is instructed to the charge-discharge electric power of accumulator and super capacitor, and then controls corresponding DC/DC converters work.
Power optimization control obtains step (1) especially by fuzzy logic algorithm at the middle and upper levels, idiographic flow block diagram such as Fig. 2 institutes Show:
First, by ac bus frequency f and ac bus rated frequency frefDeviation adjust to obtain active power through PI and lack Volume value Pref, while by the rated voltage U of ac bus voltage U and ac busrefDeviation adjust to obtain reactive power through PI Vacancy value Qref
Secondly, by hybrid energy-storing unit comprehensive state-of-charge SOCHESSWith active power shortage value PrefPass through as input Fuzzy logic algorithm obtains active power correction value Δ P, while by hybrid energy-storing unit comprehensive state-of-charge SOCHESSWith it is idle Power shortage value QrefAs input reactive power correction value Δ Q, hybrid energy-storing unit comprehensive lotus are obtained by fuzzy logic algorithm Electricity condition SOCHESSIt is obtained by following formula:
Wherein, QVRLAB、QSCThe respectively rated capacity of accumulator and super capacitor, SOCVRLAB、SOCSCRespectively accumulator With the state-of-charge of super capacitor.
For the ease of distinguishing the operating status of hybrid energy-storing unit, according to hybrid energy-storing cell S OCHESSSize will mix Energy-storage units are divided into 7 working conditions, because the capacity of ferric phosphate lithium cell compares ultracapacitor in hybrid energy-storing unit Greatly, and the state-of-charge operation interval of super capacitor is 0.1~1, the state-of-charge operation interval of ferric phosphate lithium cell is 0.2~ 0.9, state-of-charge work of the state-of-charge operation interval approximation of ferric phosphate lithium cell as hybrid energy-storing unit is chosen herein Make section, i.e. the state-of-charge operation interval of hybrid energy-storing unit is 0.2~0.9.The working condition of division is as follows:
A. work as SOCHESSWhen being run between 0.4~0.7, referred to as optimum state region, hybrid energy-storing unit is in this section Interior existing enough electricity can carry out discharge operation, also have enough residual capacities to carry out charging operations, in this case not Need the active power shortage value P exported to PI controllersrefWith reactive power vacancy value QrefIt is modified, by it, directly it is made For the power instruction of energy-storage system.
B. work as SOCHESSWhen being run between 0.7~0.8 or 0.3~0.4, referred to as suboptimum state region, at this time mixing is stored up Energy unit, which exists, overcharges or crosses the possibility put.With SOCHESSFor 0.7~0.8, what hybrid energy-storing unit presence at this time overcharged May, if hybrid energy-storing unit just from micro-capacitance sensor exchange side absorbed power, should reduce hybrid energy-storing unit and absorb energy at this time, Abandon the compensation to part imbalance power in micro-capacitance sensor.
C. work as SOCHESSWhen between 0.8~0.9 or 0.2~0.3, referred to as state of alert region, hybrid energy-storing at this time Unit, which has approached, overcharges or crosses the boundary line put.With SOCHESSFor 0.8~0.9, hybrid energy-storing unit has been forced at this time The boundary closely overcharged, if continuing, from micro-capacitance sensor absorbed power, hybrid energy-storing unit can be caused to overcharge, should be abandoned at this time pair The compensation of micro-capacitance sensor imbalance power, and select suitable opportunity that hybrid energy-storing unit is made to enter discharge condition.
D. work as SOCHESSLess than 0.2 or it is higher than 0.9, hybrid energy-storing unit is completely into alarm condition region at this time, with SOCHESSIt, should be immediately by hybrid energy-storing unit if hybrid energy-storing unit just absorbs energy from micro-capacitance sensor at this time for 0.9 Discharge condition is converted to from charged state, until SOCHESSLess than 0.9, it is transformed into state of alert region.
Fuzzy rule is formulated according to the working condition of hybrid energy-storing and the corresponding operation provided, needs to design the first mould Fuzzy controllers and the second fuzzy controller design the first fuzzy controller for correcting active power, the fuzzy controller Using the mono- two dimension fuzzy control structure exported of two inputs-, the mistake that blurring operation is carried out to input, output variable is described below Journey.
Input E1:Hybrid energy-storing cell S OCHESS, variation range (basic domain) is [0,100%], and fuzzy domain is { -3, -2, -1,0,1,2,3 }, corresponding fuzzy subset be " negative big (NB) ", " in negative (NM) ", " bearing small (NS) ", " zero (ZO) ", " just small (PS) ", " center (PM) ", " honest (PB) " }, the work shape residing for current hybrid energy-storing unit is indicated respectively State:Over-discharge state, electricity very low state, electricity Lower state, electricity normal condition, the higher state of electricity, the very high shape of electricity State, overcharge condition.
Input E2:The active power of PI controllers output instructs Pref, value range is by the specified charge and discharge of hybrid energy-storing unit The limitation of power, the rated active power of selected hybrid energy-storing unit is 10kW herein, to its value range be -10kW~ 10kW, i.e., basic domain are [- 10,10], and it is { -3, -2, -1,0,1,2,3 } to obscure domain, and corresponding fuzzy subset is { " negative big (NB) ", " in negative (NM) ", " bearing small (NS) ", " zero (ZO) ", " just small (PS) ", " center (PM) ", " honest (PB) " }, difference table Show that hybrid energy-storing unit command power value is positive and negative and size:Charge power value is very big, charge power value is medium, charge power value very It is small, do not charge do not discharge, discharge power value very little, discharge power value is medium, discharge power value is very big.
Export U:Active power correction value Δ P, value range are limited by the value model of PI controller active power instruction It encloses, in order to which when battery SOC is too low, the range of the charging and discharging state of conversion battery, Δ P should instruct slightly than active power Greatly, it is contemplated that PrefValue range, Δ P takes -12kW~12kW, i.e., basic domain is [- 12,12].Fuzzy domain be -3, - 2, -1,0,1,2,3 }, corresponding fuzzy subset be " negative big (NB) ", " in negative (NM) ", " bearing small (NS) ", " zero (ZO) ", " just Small (PS) ", " center (PM) ", " honest (PB) " }, correspond to respectively corrected output Δ P it is negative it is big, negative in, bear it is small, zero, it is just small, just In, it is honest.
According to previously described SOCHESSAnd PrefWith the relationship between correction value Δ P, rule is controlled as shown in table 1.
1 fuzzy control rule of table
Based on identical amendment rule, the fuzzy control rule of reactive power is identical as table 1, and the nothing of PI controllers output Work(power shortage value QrefRanging from -5kvar~5kvar, ranging from -6kvar~6kvar of reactive power correction value Δ Q.
Finally, to active power shortage value PrefIt sums to obtain the output of DC/AC converters with active power correction value Δ P Active power instructs P 'ref, to reactive power vacancy value QrefIt sums to obtain DC/AC converters with reactive power correction value Δ Q Output reactive power instructs Q 'ref
It is illustrated in figure 3 the control block diagram of lower layer's power distribution, step (2) includes the following steps:
(201) by DC bus rated voltage VrefWith DC bus-bar voltage VdcDeviation adjust to obtain hybrid energy-storing through PI The charge-discharge electric power P of unitHESS
(202) by the charge-discharge electric power P of hybrid energy-storing unitHESSIt filters to obtain low frequency component and make by low-pass filter For accumulator cell charging and discharging power instruction Pbat, while instructing P using high fdrequency component as super capacitor charge-discharge electric powersc
Obtain accumulator cell charging and discharging power instruction PbatP is instructed with super capacitor charge-discharge electric powerscAfter also need to carry out it It corrects, specially:
(a) charge and discharge corrected output Δ P ' is sought according to the following formula:
Δ P '=(SOCSC-SOCVRLAB)×|PHESS| × β,
Wherein, SOCVRLAB、SOCSCThe respectively state-of-charge of accumulator and super capacitor, PHESSFor hybrid energy-storing unit Charge-discharge electric power, β are correction factor, and β value ranges are 1.1~1.3;
(b) calculating accumulator charge-discharge electric power instruction correction value P 'bat:P′bat=Pbat+ Δ P ' calculates super capacitor charge and discharge Electrical power instructs correction value P 'sc:P′sc=Psc-ΔP′;
In turn by accumulator cell charging and discharging power instruction correction value P 'batAs accumulator cell charging and discharging power instruction, by super electricity Hold charge-discharge electric power instruction correction value P 'scIt is instructed as super capacitor charge-discharge electric power, to control corresponding DC/DC converters Work.
The present embodiment is carried out and is used using the hybrid energy-storing hierarchical coordinative control method based on state-of-charge common The hybrid energy-storing unit charge and discharge allocation strategy of low-pass filtering algorithm carries out contrast experiment.It is comprehensive that Fig. 4 show hybrid energy-storing unit Close state-of-charge SOCHESSCurve comparison figure, curve a1 is the hybrid energy-storing layering association based on state-of-charge of the present invention in figure The hybrid energy-storing unit comprehensive state-of-charge SOC of control methodHESSCurve, curve a2 are the mixing of general low pass filtering algorithm Energy-storage units integrate state-of-charge SOCHESSCurve, as seen from the figure, the hybrid energy-storing layering association of the invention based on state-of-charge The hybrid energy-storing unit comprehensive state-of-charge SOC of control methodHESSVariation range controls between 0.2~0.8, maintains conjunction Within the scope of reason, overcharging or putting excessively for hybrid energy-storing unit is effectively prevented.Fig. 5 is super capacitor state-of-charge SOCSCCurve Comparison diagram, curve b1 is super capacitor state-of-charge SOC under control method of the present invention in figureSCCurve, curve b2 are general control Super capacitor state-of-charge Q under methodSCCurve.Fig. 6 is storage battery charge state SOCVRLABCurve comparison figure, curve in figure C1 is storage battery charge state SOC under control method of the present inventionVRLABCurve, curve c2 are that accumulator is charged under general control method State SOCVRLABCurve.By Fig. 5 Fig. 6 it is found that under control method using the present invention, the charged shape of ultracapacitor and accumulator The state small many of variation range in the whole process, such as super capacitor state-of-charge QSCVariation range is 0.25~0.68, electric power storage Pond state-of-charge SOCVRLABVariation range is 0.25~0.78, and there is no overcharge or cross to put.

Claims (4)

1. a kind of hybrid energy-storing hierarchical coordinative control method based on state-of-charge, for containing the micro-capacitance sensor for mixing energy-storage units Control, the hybrid energy-storing unit includes accumulator and super capacitor, and the accumulator and super capacitor pass through DC/ respectively DC converters are connected to DC bus, and DC bus is connected to micro-capacitance alternating current bus by DC/AC converters, and feature exists In this method comprises the following steps:
(1) micro-capacitance alternating current bus voltage U, ac bus frequency f and hybrid energy-storing unit comprehensive state-of-charge SOC are obtainedHESS, According to U, f and SOCHESSIt carries out upper layer power optimization to control to obtain the output power instruction of DC/AC converters, and then controls DC/ AC converters work;
(2) DC bus-bar voltage V is obtaineddc, lower layer's power distribution is carried out by target of stable DC busbar voltage, respectively obtains storage The charge-discharge electric power of battery and super capacitor instructs, and then controls corresponding DC/DC converters work;
Power optimization control obtains step (1) especially by fuzzy logic algorithm at the middle and upper levels, specifically includes:
(101) by ac bus frequency f and ac bus rated frequency frefDeviation adjust to obtain active power shortage value through PI Pref, while by the rated voltage U of ac bus voltage U and ac busrefDeviation adjust to obtain reactive power vacancy through PI Value Qref
(102) by hybrid energy-storing unit comprehensive state-of-charge SOCHESSWith active power shortage value PrefIt is patrolled by fuzzy as input Volume algorithm obtains active power correction value Δ P, while by hybrid energy-storing unit comprehensive state-of-charge SOCHESSIt is lacked with reactive power Volume value QrefAs input reactive power correction value Δ Q is obtained by fuzzy logic algorithm;
(103) to active power shortage value PrefThe output for summing to obtain DC/AC converters with active power correction value Δ P is active Power instruction P 'ref, to reactive power vacancy value QrefIt sums to obtain the output of DC/AC converters with reactive power correction value Δ Q Reactive power instructs Q 'ref
2. a kind of hybrid energy-storing hierarchical coordinative control method based on state-of-charge according to claim 1, feature exist In the hybrid energy-storing unit comprehensive state-of-charge SOCHESSIt is obtained by following formula:
Wherein, QVRLAB、QSCThe respectively rated capacity of accumulator and super capacitor, SOCVRLAB、SOCSCRespectively accumulator and super The state-of-charge of grade capacitance.
3. a kind of hybrid energy-storing hierarchical coordinative control method based on state-of-charge according to claim 1, feature exist In the step (2) specifically includes:
(201) by DC bus rated voltage VrefWith DC bus-bar voltage VdcDeviation adjust to obtain hybrid energy-storing unit through PI Charge-discharge electric power PHESS
(202) by the charge-discharge electric power P of hybrid energy-storing unitHESSIt filters to obtain low frequency component by low-pass filter and is used as storage Battery charging and discharging power instruction Pbat, while instructing P using high fdrequency component as super capacitor charge-discharge electric powersc
4. a kind of hybrid energy-storing hierarchical coordinative control method based on state-of-charge according to claim 3, feature exist In obtaining accumulator cell charging and discharging power instruction PbatP is instructed with super capacitor charge-discharge electric powerscAfter also need to be modified it, Specially:
(a) charge and discharge corrected output Δ P ' is sought according to the following formula:
Δ P '=(SOCSC-SOCVRLAB)×|PHESS| × β,
Wherein, SOCVRLAB、SOCSCThe respectively state-of-charge of accumulator and super capacitor, PHESSFor the charge and discharge of hybrid energy-storing unit Electrical power, β are correction factor, and β value ranges are 1.1~1.3;
(b) calculating accumulator charge-discharge electric power instruction correction value P 'bat:P′bat=Pbat+ Δ P ' calculates super capacitor charge and discharge electric work Rate instructs correction value P 'sc:P′sc=Psc-ΔP′;
In turn by accumulator cell charging and discharging power instruction correction value P 'batAs accumulator cell charging and discharging power instruction, super capacitor is filled Discharge power instructs correction value P 'scIt is instructed as super capacitor charge-discharge electric power, to control corresponding DC/DC converters work Make.
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