CN107370187A - A kind of photovoltaic microgrid system and photovoltaic microgrid system control method - Google Patents
A kind of photovoltaic microgrid system and photovoltaic microgrid system control method Download PDFInfo
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- CN107370187A CN107370187A CN201710807355.5A CN201710807355A CN107370187A CN 107370187 A CN107370187 A CN 107370187A CN 201710807355 A CN201710807355 A CN 201710807355A CN 107370187 A CN107370187 A CN 107370187A
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Abstract
The present invention provides a kind of photovoltaic microgrid system and photovoltaic microgrid system control method.Wherein, photovoltaic microgrid system includes：Multiple stage type photovoltaic generation subsystems in parallel；Any stage type photovoltaic generation subsystem includes：Multiple power optimization devices, multiple power optimization device control units, concentrate inverter and concentrate inverter control unit.Wherein, photovoltaic microgrid system control method includes：For any photovoltaic generation subsystem, the active power and reactive power for concentrating inverter output are obtained；Obtain the available maximum active power for concentrating inverter and can use maximum reactive power；Obtain reference voltage；Generate the control signal of the concentration inverter.A kind of photovoltaic microgrid system and photovoltaic microgrid system control method provided by the invention, realize coordination control of multiple photovoltaic generation subsystems under without communication condition, the autonomous of proof load power, reasonable distribution and the stabilization of photovoltaic microgrid system voltage and frequency.
Description
Technical field
The present invention relates to technical field of photovoltaic power generation, more particularly, to a kind of photovoltaic microgrid system and the micro- electricity of photovoltaic
Net system control method.
Background technology
Photovoltaic generation has the advantages that low in the pollution of the environment, infield is flexible, energy utilization rate is high, is current distributed hair
One of important development trend of electricity.Photovoltaic micro can coordinate difference as the effective carrier for integrating distributed photovoltaic power
The photovoltaic generating system in region, the stochastic uncertainty and region dependence of part photovoltaic generation are overcome to a certain extent, improve
Overall the steady electricity supply ability and power quality of system.When photovoltaic micro runs on off-network pattern, photovoltaic generating system
With certain stochastic volatility, it is difficult to keep the voltage and frequency stabilization of photovoltaic microgrid system.
The photovoltaic generating system of photovoltaic micro is broadly divided into single-stage photovoltaic power generation system and stage type photovoltaic generation system
System.Stage type photovoltaic generating system, mainly it is made up of photovoltaic board component, DC/DC converters and concentration inverter.By to wherein
The coordination control of the concentration inverter of all stage type photovoltaic generating systems, can run on off-network mould in photovoltaic microgrid system
During formula, the voltage and frequency of stable photovoltaic microgrid system.The existing coordination to concentrating inverter controls, based on stage type light
Communication between photovoltaic generating system, by coordinating between stage type photovoltaic generating system power-balance come regulating system voltage or frequency,
Higher communication bandwidth is needed, without plug and play characteristic and higher reliability.
The content of the invention
The present invention in order to overcome the coordination of multiple photovoltaic generation subsystems of existing photovoltaic microgrid system control, it is necessary to compared with
A kind of deficiency of high communication bandwidth, there is provided photovoltaic microgrid system and photovoltaic microgrid system control method.
According to an aspect of the present invention, there is provided a kind of photovoltaic microgrid system, including：Multiple stage type photovoltaics in parallel
Power generation sub-system；Any stage type photovoltaic generation subsystem, including：Multiple power optimization devices, multiple power optimization device controls
Unit, concentration inverter and concentration inverter control unit processed；The multiple power optimization device series connection；Multiple power optimization device strings
Output end after connection is connected with the input of the concentration inverter；Each corresponding power of the power optimization device is excellent
Change device control unit；The power optimization device control unit, for the output voltage according to the power optimization device, switch to two
Kind different working modes, Hysteresis control is carried out to the power optimization device；The concentration inverter control unit, for according to institute
The available maximum active power for concentrating inverter is stated, the power output of the concentration inverter is controlled, it is each to cause
The difference of the available maximum active power and power output of the concentration inverter of stage type photovoltaic generation subsystem is equal.
Preferably, the concentration inverter control unit includes：Power computation module, power outer shroud control module, it can use
Peak power dynamic pre-estimating module, voltage x current control module and PWM module；The power computation module, for basis
The output voltage and output current for concentrating inverter, obtain the active-power P for concentrating inverter output0With idle work(
Rate Q0；It is described to use peak power dynamic pre-estimating module, for according to it is described concentration inverter input current and input voltage,
Obtain the available maximum active power of the concentration inverterWith available maximum reactive powerThe power outer shroud
Control module, for the active-power P exported according to the concentration inverter0, reactive power Q0, maximum active power can be usedWith available maximum reactive powerObtain reference voltage Vrsinωrt；The voltage x current control module, for root
According to the reference voltage VrsinωrT, voltage reference signal in inverter in spanning set；The PWM module, for modulating
Voltage reference signal in the concentration inverter, generate the control signal for concentrating inverter.
Preferably, the active-power P for the concentration inverter output that the power computation module obtains0And reactive power
Q0Respectively
Wherein, VoacTo concentrate the output voltage of inverter, IoacTo concentrate the output current of inverter, Vo'acFor VoacIt is stagnant
90 degree of voltage afterwards, τ are LPF constant.
Preferably, the available maximum of the concentration inverter obtained with peak power dynamic pre-estimating module is active
PowerWith available maximum reactive powerRespectively：
As the input voltage V of the concentration inverterbusLess than Vbus,minWhen, the available maximum for concentrating inverter has
Work(powerWith available maximum reactive powerRespectively
Wherein,To concentrate the available maximum active power of inverter,To concentrate the available maximum nothing of inverter
Work(power, PrealtimeTo concentrate the realtime power of inverter, SmaxTo concentrate the maximum of inverter apparent capacity, Vbus,minFor
The minimum output voltage for concentrating inverter to allow, ibusTo concentrate the input current of inverter, VbusTo concentrate the input of inverter
Voltage；
As the input voltage V of the concentration inverterbusHigher than Vbus,maxWhen, concentrate the available maximum wattful power of inverter
RateWith available maximum reactive powerRespectively
Wherein,The available maximum active power of inverter is concentrated when being clapped for kth,For (k+1)
The available maximum active power of inverter is concentrated during bat,The available maximum of inverter is concentrated when being clapped for (k+1)
Reactive power, SmaxTo concentrate the maximum of inverter apparent capacity, Vbus,maxFor the maximum output electricity for concentrating inverter to allow
Pressure.
Preferably, the ω in the reference voltage that the power outer shroud control module obtainsrAnd VrRespectively
Wherein, ωr、VrRespectively concentrate the angular frequency and amplitude reference value of inverter output voltage, ω*、V*Respectively collect
The angular frequency and amplitude of middle inverter output voltage under rated condition, m, n are respectively to concentrate inverter active-angular frequency sagging
(P- ω) and idle-voltage sagging (Q-V) sagging coefficient,Respectively the available maximum of inverter is concentrated to have
Work(power and available maximum reactive power, Vbus、The input voltage and its nominal reference of inverter are respectively concentrated, k is
Adjustment factor.
Preferably, according to the input voltage nominal reference of the concentration inverterDetermine that the concentration inverter is permitted
Perhaps minimum output voltage and the maximum output voltage for concentrating inverter to allow.
Preferably, the power optimization device control unit, according to the output voltage of the power optimization device, two kinds are switched to
Different working modes, further comprise：
As the output voltage V of the power optimization devicedcLess than Vdc,minWhen, the power optimization device control unit switches to
Maximal power tracing mode of operation；Wherein, Vdc,minThe minimum output voltage allowed for power optimization device；
As the output voltage V of the power optimization devicedcHigher than Vdc,maxWhen, the power optimization device control unit switches to
Straight-through mode of operation；Wherein, Vdc,maxThe maximum output voltage allowed for power optimization device.
Preferably, according to the output voltage reference value of the power optimization deviceDetermine what the power optimization device allowed
Minimum output voltage Vdc,minThe maximum output voltage V allowed with the power optimization devicedc,max；
The output voltage reference value of the power optimization deviceFor
Wherein,To concentrate the input voltage nominal reference of inverter, n is stage type off-network photovoltaic generation subsystem
The total quantity of middle power optimization device.
According to another aspect of the present invention, there is provided a kind of photovoltaic microgrid system control method includes：For any light
Lie prostrate power generation sub-system,
S1, the output voltage V according to concentration inverteroacWith output current Ioac, obtain the concentration inverter output
Active-power PoAnd reactive power Qo；
S2, the input current i according to the concentration inverterbusWith input voltage Vbus, obtain the concentration inverter
Maximum active power can be usedWith available maximum reactive power
S3, the active-power P according to the concentration invertero, reactive power Qo, maximum active power can be usedWith can
With maximum reactive powerObtain reference voltage Vrsinωrt；
S4, according to the reference voltage VrsinωrT, generate the control signal for concentrating inverter.
Preferably, the step S4 further comprises：
S41, according to the reference voltage VrsinωrT, voltage reference signal in inverter in spanning set；
Voltage reference signal in S42, the modulation concentration inverter, generates the control signal for concentrating inverter.
A kind of photovoltaic microgrid system and photovoltaic microgrid system control method provided by the invention, realize multiple photovoltaics
Coordination control of the power generation sub-system under without communication condition, the autonomous of proof load power, reasonable distribution and photovoltaic micro system
The stabilization for voltage and the frequency of uniting.
Brief description of the drawings
Fig. 1 is a kind of structural representation of photovoltaic microgrid system of the embodiment of the present invention；
Fig. 2 is the structural representation of the concentration inverter control unit in photovoltaic microgrid system of the embodiment of the present invention；
Fig. 3 is the control principle signal of the power optimization device control unit in photovoltaic microgrid system of the embodiment of the present invention
Figure；
Fig. 4 is a kind of flow chart of photovoltaic microgrid system control method of the embodiment of the present invention.
Embodiment
With reference to the accompanying drawings and examples, the embodiment of the present invention is described in further detail.Implement below
Example is used to illustrate the present invention, but is not limited to the scope of the present invention.
Fig. 1 is a kind of structural representation of photovoltaic microgrid system of the embodiment of the present invention.As shown in figure 1, a kind of photovoltaic is micro-
Network system includes：Multiple stage type photovoltaic generation subsystems in parallel；Any stage type photovoltaic generation subsystem, including：It is more
Individual power optimization device, multiple power optimization device control units, concentrate inverter and concentrate inverter control unit；Multiple power are excellent
Change device series connection；Output end after multiple power optimization device series connection is with concentrating the input of inverter to be connected；Each power optimization device
A corresponding power optimization device control unit；Power optimization device control unit, for the output voltage according to power optimization device, cuts
Two kinds of different working modes are changed to, Hysteresis control is carried out to power optimization device；Inverter control unit is concentrated, for according to concentration
The available maximum active power of inverter, the power output of the concentration inverter is controlled, to cause each stage type
The difference of the available maximum active power and power output of the concentration inverter of photovoltaic generation subsystem is equal.
Photovoltaic microgrid system includes multiple stage type photovoltaic generation subsystems.Wherein, multiple is at least two.Reference chart
1, photovoltaic microgrid system includes M stage type photovoltaic generation subsystem.Wherein, M >=2.M stage type photovoltaic generation subsystem
It is parallel with one another, it is all connected to common bus.Region equivalent load is also associated with common bus.
Below by taking the 1st stage type photovoltaic generation subsystem as an example, illustrate the knot of each stage type photovoltaic generation subsystem
Structure.The structure of other stage type photovoltaic generation subsystems, i.e. the 2nd stage type photovoltaic generation subsystem to M stage types photovoltaic are sent out
The structure of electronic system, identical with the structure of the 1st stage type photovoltaic generation subsystem, here is omitted.
1st stage type photovoltaic generation subsystem includes：Multiple power optimization devices, multiple power optimization device control units, collection
Middle inverter and concentration inverter control unit.
The prime of 1st stage type photovoltaic generation subsystem is multiple power optimization devices.1st stage type photovoltaic generation subsystem
In power optimization device quantity be n, wherein, n >=2.N power optimization device is Boost DC/direct current (Boost type DC/
DC) power optimization device.
The input electricity that the input of each power optimization device passes through power optimization device with the output end of photovoltaic board component
Hold connection.Each power optimization device is controlled to coupled photovoltaic board component.
The output end of each power optimization device also includes output capacitor.
The output end of n power optimization device is connected, it is possible to increase the boost capability of prime.
Each corresponding power optimization device control unit of power optimization device.Each power optimization device control unit, pair with
Its connected power optimization device is controlled.Power optimization device control unit, according to the output voltage of power optimization device, is switched to
Two kinds of different working modes, the control signal of power optimization device is generated, the dutycycle of the semiconductor switch of power optimization device is entered
Row control, realizes the Hysteresis control to power optimization device.
The prime of 1st stage type photovoltaic generation subsystem is that rear class is to concentrate inverter.The input of inverter is concentrated, is led to
Cross the output end after dc-link capacitance is connected with n power optimization device to be connected, and certain journey is realized by dc-link capacitance
The decoupling function of degree.
The outlet side of inverter is concentrated to be connected by line impedance 1 with the common bus of photovoltaic micro.
Concentration inverter is DC/AC inverters.In order to preferably realize the ability of AC/DC (DC/AC) power converter,
Inverter is concentrated to use typical single-phase full bridge voltage source inverter, but not limited to this.
Inverter control unit is concentrated, the defeated of inverter is concentrated according to the available maximum active power controller of inverter is concentrated
Go out power.By each concentration inverter control unit according to the available maximum active power for concentrating inverter, to concentrating inversion
The control of the power output of device, make each stage type photovoltaic generation subsystem concentration inverter available maximum active power with
The difference of power output is equal.
The embodiment of the present invention is by each concentration inverter control unit according to the available maximum wattful power for concentrating inverter
Rate, the control of the power output to concentrating inverter, realizes coordination of multiple photovoltaic generation subsystems under without communication condition
Control, the autonomous of proof load power, reasonable distribution and the stabilization of photovoltaic microgrid system voltage and frequency, has plug and play
Property and higher reliability.Further, photovoltaic microgrid system provided in an embodiment of the present invention, be particularly suitable for use in high permeability
The micro-capacitance sensor of photovoltaic, in the case where the total photovoltaic power generation quantity of system is more than workload demand amount, it is not necessary to which a large amount of energy storage devices come steady
Determine the power output of system, it is not necessary to the support of energy-storage system and supplementary energy, greatly reduce auxiliary type in photovoltaic micro
The investment of the schedulable energy, the construction cost of system is saved, the waste of energy storage device will not be caused.Further, based on work(
The stage type photovoltaic generation subsystem of rate optimizer cascaded structure, realize boost function and the conversion of higher system of global voltage
Efficiency, have the advantages that simple in construction, control flexibly, high conversion efficiency and reliable and stable.
Fig. 2 is the structural representation of the concentration inverter control unit in photovoltaic microgrid system of the embodiment of the present invention.Base
In above-described embodiment, as shown in Fig. 2 concentrating inverter control unit to include：Power computation module, power outer shroud control module,
Peak power dynamic pre-estimating module, voltage x current control module and PWM module can be used.
Power computation module, for according to the output voltage and output current for concentrating inverter, obtaining and concentrating inverter defeated
The active-power P gone out0And reactive power Q0。
Peak power dynamic pre-estimating module can be used, for according to the input current and input voltage for concentrating inverter, obtaining
Concentrate the available maximum active power of inverterWith available maximum reactive power
Power outer shroud control module, for according to the active-power P for concentrating inverter to export0, reactive power Q0, it is available most
Big active powerWith available maximum reactive powerObtain reference voltage Vrsinωrt。
Voltage x current control module, for according to reference voltage VrsinωrT, voltage reference signal in inverter in spanning set.
PWM module, for voltage reference signal in inverter in modulation set, the control signal of inverter in spanning set.
Specifically, power computation module is according to the output voltage V for concentrating inverteroacWith output current Ioac, obtain and concentrate
The active-power P of inverter output0And reactive power Q0.Concentrate the output voltage V of inverteroacWith output current Ioac, Ke Yitong
Cross the conventional voltage detecting in this area and electric current detecting method obtains.Inversion is concentrated for example, can be obtained by voltage transformer
The output voltage V of deviceoac, the output current I for concentrating inverter is obtained by current transformeroac, but not limited to this.
Power computation module, by the active-power P of acquisition0And reactive power Q0It is sent to power outer shroud control module.
It can be included can use maximum active power with peak power and can use maximum reactive power.
Peak power dynamic pre-estimating module can be used, according to the input current i for concentrating inverterbusWith input voltage Vbus, obtain
Take the available maximum active power for concentrating inverterWith available maximum reactive power
Peak power dynamic pre-estimating module can be used, by the available maximum active power of the concentration inverter of acquisitionWith can
With maximum reactive powerIt is sent to power outer shroud control module.
Power outer shroud control module, the active-power P for concentrating inverter to export for receiving and being sent according to power computation module0
And reactive power Q0, and the available maximum active power for concentrating inverter that peak power dynamic pre-estimating module can be used to send
With available maximum reactive powerTo concentrating inverter to carry out power outer shroud control, and generate reference voltage Vrsinωrt。
Concentrate the active-power P of inverter output0And reactive power Q0, and concentrate the available maximum wattful power of inverter
RateWith available maximum reactive powerIt is the foundation to concentrating inverter to be controlled.By to each stage type light
Lie prostrate power generation sub-system concentration inverter control, make each stage type photovoltaic generation subsystem concentration inverter it is available most
The difference of big active power and power output is equal.
Power outer shroud control module, by reference voltage VrsinωrT is sent to voltage x current control module.
Voltage x current control module, the reference voltage V generated according to the power outer shroud control module of receptionrsinωrT is right
The output capacitance voltage and inductive current of inverter carry out two close cycles tracing control, Voltage Reference letter in inverter in spanning set
Number.
Voltage x current control module, voltage reference signal in inverter will be concentrated to be sent to PWM module.
PWM module, to voltage reference signal in the concentration inverter of the voltage x current control module generation of reception, enter
Row PWM (Pulse-width modulation, pulse width modulation), the control signal of inverter in spanning set, to collection
The dutycycle of the semiconductor switch of middle inverter is controlled.
The embodiment of the present invention is by concentrating inverter control unit, according to the available peak power for concentrating inverter, to collection
The control of the power output of middle inverter, coordination control of multiple photovoltaic generation subsystems under without communication condition is realized, is protected
Demonstrate,prove the reasonable distribution and the stabilization of photovoltaic microgrid system voltage and frequency of bearing power, have plug and play and it is higher can
By property.
Based on above-described embodiment, what power computation module obtained concentrates the active-power P that inverter exports0And reactive power
Q0Respectively
Wherein, VoacTo concentrate the output voltage of inverter, IoacTo concentrate the output current of inverter, Vo'acFor VoacIt is stagnant
90 degree of voltage afterwards, τ are LPF constant.
The available maximum active power for concentrating inverter that peak power dynamic pre-estimating module can be used to obtainWith it is available
Maximum reactive powerRespectively：
As the input voltage V for concentrating inverterbusLess than Vbus,minWhen, concentrate the available maximum active power of inverterWith available maximum reactive powerRespectively
Wherein,To concentrate the available maximum active power of inverter,To concentrate the available maximum nothing of inverter
Work(power, PrealtimeTo concentrate the realtime power of inverter, SmaxTo concentrate the maximum of inverter apparent capacity, Vbus,minFor
The minimum output voltage for concentrating inverter to allow, ibusTo concentrate the input current of inverter, VbusTo concentrate the input of inverter
Voltage；
As the input voltage V for concentrating inverterbusHigher than Vbus,maxWhen, concentrate the available maximum active power of inverterWith available maximum reactive powerRespectively
Wherein,The available maximum active power of inverter is concentrated when being clapped for kth,For (k+1)
The available maximum active power of inverter is concentrated during bat,The available maximum of inverter is concentrated when being clapped for (k+1)
Reactive power, SmaxTo concentrate the maximum of inverter apparent capacity, Vbus,maxFor the maximum output electricity for concentrating inverter to allow
Pressure.
ω in the reference voltage that power outer shroud control module obtainsrAnd VrRespectively
Wherein, ωr、VrRespectively concentrate the angular frequency and amplitude reference value of inverter output voltage, ω*、V*Respectively collect
The angular frequency and amplitude of middle inverter output voltage under rated condition, m, n are respectively to concentrate inverter active-angular frequency sagging
(P- ω) and idle-voltage sagging (Q-V) sagging coefficient,Respectively the available maximum of inverter is concentrated to have
Work(power and available maximum reactive power, Vbus、The input voltage and its nominal reference of inverter are respectively concentrated, k is
Adjustment factor.
According to the input voltage nominal reference for concentrating inverterIt is determined that the minimum output electricity for concentrating inverter to allow
Pressure and the maximum output voltage for concentrating inverter to allow.
Specifically, power computation module, according to the output voltage V for concentrating inverteroacWith output current Ioac, it is determined that concentrating
The active-power P of inverter outputoAnd reactive power Qo.Concentrate the active-power P of inverter outputoAnd reactive power QoRespectively
It can be calculated by below equation：
Wherein, VoacTo concentrate the output voltage of inverter, IoacTo concentrate the output current of inverter, Vo'acFor VoacIt is stagnant
90 degree of voltage afterwards, τ are LPF constant.
Power computation module, obtain active-power P0And reactive power Q0Afterwards, by the active-power P of acquisition0And reactive power
Q0It is sent to power outer shroud control module.
Photovoltaic generation subsystem is in actual motion, it may appear that the situation of unstable working condition.When there is working condition
When unstable, concentrating the available peak power of inverter can change.Therefore, peak power dynamic pre-estimating module can be used, it is necessary to root
According to the working condition of photovoltaic generation subsystem, the available peak power for concentrating inverter is obtained.
Photovoltaic generation subsystem is limited by natural environmental condition, concentrates the power output of inverter by the defeated of concentration inverter
Enter the limitation of power.When the input power and power output of concentrating inverter are mutually matched, photovoltaic generation subsystem is stable to be transported
OK；When the input power and power output of concentrating inverter mismatch, photovoltaic generation subsystem fluctuation of service.
When concentrating the input power of inverter to be less than power output, the available peak power deficiency of inverter is concentrated, directly
Stream bus capacitor voltage persistently reduces, and photovoltaic generation subsystem fluctuation of service, the power optimization device of prime runs on maximum work
Rate tracking mode of operation (MPPT mode of operations).Therefore, it is necessary to which peak power dynamic pre-estimating module dynamic refresh concentration can be used inverse
Become the available peak power of device, the concentration inverter output of reduction.
When concentrating the input power of inverter to be more than power output, concentrate the available peak power of inverter superfluous, directly
Stream bus capacitor voltage is begun to ramp up, and now with peak power dynamic pre-estimating module dynamic refresh can not be needed to use peak power
Reference value.The output of the power optimization device of prime is reduced, that is, concentrates the input power of inverter to reduce, until reaching concentration inversion
Input power and the power output balance of device.
Whether the running status of photovoltaic generation subsystem is stablized, can be according to the input voltage V for concentrating inverterbusIt is determined that.
As the input voltage V for concentrating inverterbusLess than Vbus,minWhen, photovoltaic generation subsystem fluctuation of service.Wherein,
Vbus,minTo concentrate the minimum output voltage that inverter allows, VbusTo concentrate the input voltage of inverter.
The minimum output voltage V for concentrating inverter to allowbus,minAccording to the input voltage nominal reference for concentrating inverterIt is determined that.
Wherein, k1To concentrate inverter minimum output voltage coefficient, k1<1, k1Value according to
The situation of actual photovoltaic micro determines.
Preferably, k1=0.85.Now,
As the input voltage V for concentrating inverterbusLess than Vbus,minWhen, peak power dynamic pre-estimating module dynamic can be used to brush
The new available peak power for concentrating inverter.Concentrate the available maximum active power of inverterWith available maximum reactive powerIt can be obtained by below equation：
Wherein,To concentrate the available maximum active power of inverter,To concentrate the available maximum nothing of inverter
Work(power, PrealtimeTo concentrate the realtime power of inverter, SmaxTo concentrate the maximum of inverter apparent capacity, Vbus,minFor
The minimum output voltage for concentrating inverter to allow, ibusTo concentrate the input current of inverter, VbusTo concentrate the input of inverter
Voltage.
Concentrate the input current i of inverterbusWith input voltage Vbus, the conventional voltage detecting in this area and electricity can be passed through
Detection method is flowed to obtain.For example, the input voltage V for concentrating inverter can be obtained by voltage transformerbus, it is mutual by electric current
Sensor obtains the input current i for concentrating inverterbus, but not limited to this.
As the input voltage V for concentrating inverterbusHigher than Vbus,maxWhen, photovoltaic generation subsystem runs on stable state.Its
In, Vbus,maxTo concentrate the maximum output voltage that inverter allows, VbusTo concentrate the input voltage of inverter.
The maximum output voltage V for concentrating inverter to allowbus,maxAccording to the input voltage nominal reference for concentrating inverterIt is determined that.
Wherein, k2To concentrate inverter maximum output voltage coefficient, k2>1, k2Value according to
The situation of actual photovoltaic micro determines.
Preferably, k2=1.05.Now,
As the input voltage V for concentrating inverterbusHigher than Vbus,maxWhen, it is not necessary to dynamic refresh concentrates the available of inverter
Peak power, the available peak power for the concentration inverter that upper one is clappedCache to next bat
Concentrate the available maximum active power of inverterWith available maximum reactive powerIt can be obtained by below equation
Take：
Wherein,The available maximum active power of inverter is concentrated when being clapped for kth,For (k+1)
The available maximum active power of inverter is concentrated during bat,The available maximum of inverter is concentrated when being clapped for (k+1)
Reactive power, SmaxTo concentrate the maximum of inverter apparent capacity, Vbus,maxFor the maximum output electricity for concentrating inverter to allow
Pressure.
Peak power dynamic pre-estimating module, the available maximum active power of the concentration inverter of acquisition can be usedWith it is available
Maximum reactive powerAfterwards, by the available maximum active power of the concentration inverter of acquisitionWith the available idle work(of maximum
RateIt is sent to power outer shroud control module.
Power outer shroud control module, the active-power P for concentrating inverter output that receiving power computing module is sent0And nothing
Work(power Q0, and the available maximum active power for concentrating inverter that peak power dynamic pre-estimating module can be used to sendWith
Maximum reactive power can be usedAfterwards, according to the active-power P for concentrating invertero, reactive power Qo, maximum active power can be usedWith available maximum reactive powerCan be to concentrating inverter to be controlled, generation reference voltage Vrsinωrt。
Reference voltage Vr sinωrω in trAnd VrIt can be obtained by below equation：
Wherein, ωr、VrRespectively concentrate the angular frequency and amplitude reference value of inverter output voltage, ω*、V*Respectively collect
The angular frequency and amplitude of middle inverter output voltage under rated condition, m, n are respectively to concentrate inverter active-angular frequency sagging
(P- ω) and idle-voltage sagging (Q-V) sagging coefficient,Respectively the available maximum of inverter is concentrated to have
Work(power and available maximum reactive power, Vbus、The input voltage and its nominal reference of inverter are respectively concentrated, k is
Adjustment factor.
Power outer shroud control module, generation reference voltage VrsinωrAfter t, by reference voltage VrsinωrT is sent to voltage
Current control module.
When multiple parallel photovoltaic power generation sub-systems form photovoltaic microgrid system, due to the frequency of photovoltaic microgrid system
Uniformity, each photovoltaic generation subsystem is up to identical output frequency value under stable situation, therefore, is carried by the present embodiment
Control of the control method of the photovoltaic microgrid system of confession to the concentration inverter of each photovoltaic generation subsystem, can reach
Wherein,Po_iThe available maximum wattful power of the concentration inverter of respectively i-th photovoltaic generation subsystem
Rate and power output, 1≤i≤M；Po_MAvailable maximum for the concentration inverter of m-th photovoltaic generation subsystem has
Work(power and power output.
Power computation module, power outer shroud control module and available peak power dynamic pre-estimating provided in an embodiment of the present invention
Module, multiple photovoltaic generations are realized to concentrating inverter to be controlled based on the available maximum active power of inverter is concentrated
Coordination control of the subsystem under without communication condition, the autonomous of proof load power, reasonable distribution and photovoltaic microgrid system electricity
The stabilization of pressure and frequency, has plug and play and higher reliability.The stronger subsystem output of source photovoltaic generation ability
Higher performance number, the weaker subsystem of source photovoltaic generation ability export lower performance number, ensure that all photovoltaic generations
Subsystem remains identical margin of power, is easy to more preferable dynamic power to adjust；It is and defeated because of photovoltaic generation subsystem
Go out unbalanced power, cause the service life of part photovoltaic generation subsystem to shorten.Further, it is provided in an embodiment of the present invention
Power computation module, power outer shroud control module and available peak power dynamic pre-estimating module, based on the available of concentration inverter
Maximum active power to concentrating inverter to be controlled, taken into full account concentrate stable operation zone and the capacity of inverter by
Limit, the working condition of photovoltaic generation subsystem can be made quickly to return to stabilization from unstable, better ensure that photovoltaic micro system
The stabilization for voltage and the frequency of uniting.
Fig. 3 is the control principle signal of the power optimization device control unit in photovoltaic microgrid system of the embodiment of the present invention
Figure.Based on above-described embodiment, as shown in figure 3, power optimization device control unit, according to the output voltage of power optimization device, switches
For two kinds of different working modes, further comprise：As the output voltage V of power optimization devicedcLess than Vdc,minWhen, power optimization device
Control unit switches to maximal power tracing mode of operation；Wherein, Vdc,minThe minimum output voltage allowed for power optimization device；
As the output voltage V of power optimization devicedcHigher than Vdc,maxWhen, power optimization device control unit switches to straight-through mode of operation；Its
In, Vdc,maxThe maximum output voltage allowed for power optimization device.
Specifically, because the output characteristics of photovoltaic board component influences the output characteristics of power optimization device, therefore part light is worked as
When volt board component is blocked, the running status of photovoltaic board component is unstable, so as to cause the running status of power optimization device unstable
It is fixed.
When the acceptable operating point of power optimization device is located at half section of a left side for its P-U output characteristic curve, i.e.,When, work(
The running status of rate optimizer is unstable；When the acceptable operating point of power optimization device is located at right the half of its P-U output characteristic curve
Section, i.e.,When, the running status of power optimization device is stable.Therefore need to ensure that the acceptable operating point of power optimization device is steady
Half section of the right side is scheduled on, i.e., when occurring compared with large disturbances, the acceptable operating point of power optimization device is located at a left side for its P-U output characteristic curve
Half section, the acceptable operating point of power optimization device is made from its P-U output characteristic curve by the control of power optimization device control unit
Half section of a left side return to right half section.
Whether stablized according to the working condition of power optimization device, power optimization device control unit is in two kinds of different working modes
Between accordingly switched.
When the running status of power optimization device is stable, power optimization device control unit switches to straight-through mode of operation, makes
Power optimization device continues to operate in stable state.
When power optimization device running status is unstable, power optimization device control unit switches to maximal power tracing to work
Pattern, the output of power optimization device is controlled, power optimization device is returned to stable running status from unstable running status.
As the output voltage V of power optimization devicedcLess than Vdc,minWhen, power optimization device control unit switches to peak power
Track mode of operation；Wherein, Vdc,minThe minimum output voltage allowed for power optimization device；
As the output voltage V of power optimization devicedcHigher than Vdc,maxWhen, power optimization device control unit switches to straight-through work
Pattern；Wherein, Vdc,maxThe maximum output voltage allowed for power optimization device.
Specifically, whether the running status of power optimization device is stablized, and is judged by the output voltage of power optimization device.Can be with
The steady state signal of power optimization device is set as 1, unstable state signal is -1.
As the output voltage V of power optimization devicedcLess than Vdc,minWhen, power optimization device is in irregular operation state；Work as work(
The output voltage V of rate optimizerdcHigher than Vdc,maxWhen, power optimization device departs from irregular operation state, returns to stable operation shape
State.Wherein, Vdc,minThe minimum output voltage allowed for power optimization device, Vdc,maxThe maximum output electricity allowed for power optimization device
Pressure.
As the output voltage V of power optimization devicedcDecrease below Vdc,minWhen, power optimization device is in irregular operation
State, its acceptable operating point are located at half section of a left side for its P-U output characteristic curve.Power optimization device control unit runs on maximum work
Rate tracking mode of operation (MPPT mode of operations), the control signal of power optimization device is generated, control power optimization device, pass through control
The semiconductor switch pipe dutycycle of power optimization device, the Hysteresis control of the output lateral capacitance to power optimization device, control power are excellent
Change the output of device.Specific control process includes：Make the outlet side capacitor fast charging of power optimization device, the output of power optimization device
Voltage gradually increases, and the acceptable operating point of power optimization device progressively disengages the left half section unstable state of P-U output characteristic curves,
Return to the right half section stable state of P-U output characteristic curves.As the output voltage V of power optimization devicedcIncrease to and be higher than Vdc,max
When, power optimization device departs from irregular operation state, returns to steady operational status.
When the running status of power optimization device is stable, its acceptable operating point is located at right the half of its P-U output characteristic curve
Section, power optimization device control unit run on straight-through mode of operation, control the semiconductor of power optimization device, now power optimization device
Switching tube dutycycle is 0, and the output characteristics of photovoltaic board component is power optimization device output characteristics.
With reference to figure 3, for n-th of power optimization device control unit, according to the output voltage V of n-th of power optimization devicedcn
Two kinds of different working modes are switched to, generate corresponding control signal.When n-th of power optimization device control unit runs on maximum
During power tracking mode of operation, according to the input voltage and input current of n-th of power optimization device, i.e. n-th of power optimization device
The output voltage V of the photovoltaic board component of connectionpvnWith output current ipvn, the control signal of n-th of power optimization device of generation；When
When n power optimization device control unit runs on straight-through mode of operation, the control signal of n-th of power optimization device of generation, n-th
The semiconductor switch pipe dutycycle of power optimization device is 0.
The embodiment of the present invention is excellent to stablize the corresponding power by power optimization device control unit switching working mode
Change the running status of device, taken into full account the dynamic response and stable operation zone of photovoltaic board component, realized part photovoltaic panel
Autonomous power distribution between the power optimization device connected when component is blocked, has validity and feasible in practical engineering application
Property, avoid because the power output of multiple photovoltaic board components or power optimization device is uneven, cause photovoltaic board component or power excellent
Change the shortening of the service life of device.
The minimum output voltage V allowed based on above-described embodiment, power optimization devicedc,minAllow most with power optimization device
Big output voltage Vdc,max, according to the output voltage reference value of power optimization deviceIt is determined that；
The output voltage reference value of power optimization deviceFor
Wherein,To concentrate the input voltage nominal reference of inverter, n is stage type off-network photovoltaic generation subsystem
The total quantity of middle power optimization device.
Specifically, the minimum output voltage V that power optimization device allowsdc,minThe maximum output electricity allowed with power optimization device
Press Vdc,max, all in accordance with the output voltage reference value V of power optimization device* dcIt is determined that.
The output voltage reference value of power optimization deviceAccording to the input voltage nominal reference for concentrating inverterWith
The total quantity n of power optimization device is determined in stage type off-network photovoltaic generation subsystem.Concentrate the specified ginseng of input voltage of inverter
Examine valueThat is the output voltage nominal reference after n power optimization device series connection.Therefore, can be by n power optimization device string
Output voltage nominal reference after connection, it is evenly distributed to each power optimization device.The output voltage reference value of power optimization deviceFor
The minimum output voltage V that power optimization device allowsdc,min, by the output voltage reference value of power optimization deviceReally
It is fixed.
Wherein, k3For power optimization device minimum output voltage coefficient, k3<1, k3Value according to reality
The situation of border photovoltaic micro determines.
Preferably, k3=0.9.Now,
The maximum output voltage V that power optimization device allowsdc,min, by the output voltage reference value of power optimization deviceIt is determined that.
Wherein, k4For power optimization device maximum output voltage coefficient, k4>1, k4Value according to reality
The situation of border photovoltaic micro determines.
Preferably, k4=1.1.Now,
The embodiment of the present invention determines that power optimization device allows minimum defeated by the output voltage reference value of power optimization device
Go out the maximum output voltage that voltage and power optimization device allow, can easily and accurately determine the working condition of power optimization device
Whether stablize, the mode of operation of timely power switched optimizer, quickly realize the reasonable distribution and photovoltaic micro of bearing power
The stabilization of system voltage and frequency.
Fig. 4 is a kind of flow chart of photovoltaic microgrid system control method of the embodiment of the present invention.A kind of as shown in figure 4, light
Volt micro-grid system control method includes：For any photovoltaic generation subsystem, S1, the output voltage according to concentration inverter
VoacWith output current Ioac, obtain the active-power P for concentrating inverter outputoAnd reactive power Qo；S2, according to concentrate inverter
Input current ibusWith input voltage Vbus, obtain the available maximum active power for concentrating inverterIt is idle with available maximum
PowerS3, the active-power P according to concentration invertero, reactive power Qo, maximum active power can be usedWith it is available
Maximum reactive powerObtain reference voltage Vrsinωrt；S4, according to reference voltage VrsinωrT, inversion in spanning set
The control signal of device.
Step S4 further comprises：S41, according to reference voltage VrsinωrT, Voltage Reference letter in inverter in spanning set
Number；Voltage reference signal in inverter in S42, modulation set, the control signal of inverter in spanning set.
Specifically, step S1, step S2 and step S3, can be respectively by above-mentioned photovoltaic microgrid system embodiment
Power computation module, peak power dynamic pre-estimating module and power outer shroud control module can be used to realize.Obtain and concentrate in step S1
The active-power P of inverter outputoAnd reactive power Qo, the available maximum active power for concentrating inverter is obtained in step S2With available maximum reactive powerAnd reference voltage V is obtained in step S3rsinωrT detailed process, is referred to
Above-mentioned photovoltaic microgrid system embodiment, here is omitted.
Step S4, according to reference voltage VrsinωrT, the control signal of inverter in spanning set.
According to reference voltage VrsinωrT, the control signal of inverter in spanning set, pass through half of inverter in domination set
The dutycycle of conductor switch, two close cycles tracing control, control are carried out to the output capacitance voltage and inductive current for concentrating inverter
Concentrate the power output of inverter.For typical single-phase full bridge voltage source inverter, the control of inverter by generating is concentrated
Signal processed, the dutycycle of four semiconductor switch of inverter in domination set, the power output of inverter in domination set.
In step S4 step S41, according to reference voltage VrsinωrT, can be to the output capacitance voltage of concentration inverter
Two close cycles tracing control is carried out with inductive current, voltage reference signal in inverter in spanning set.
In step S4 step S42, voltage reference signal in inverter in modulation set, the control letter of inverter in spanning set
Number.Modulation to concentrating voltage reference signal in inverter, typically using PWM.
By photovoltaic microgrid system control method provided in an embodiment of the present invention, when multiple parallel photovoltaic power generation sub-systems
When forming photovoltaic microgrid system, due to the frequency invariance of photovoltaic microgrid system, each photovoltaic generation under stable situation
System is up to identical output frequency value, therefore, the control method pair of the photovoltaic microgrid system provided by the present embodiment
The control of the concentration inverter of each photovoltaic generation subsystem, can reach
Wherein,Po_iAvailable maximum active power for the concentration inverter of i-th of photovoltaic generation subsystem is estimated
Meter and power output, 1≤i≤M；Po MAvailable maximum for the concentration inverter of m-th photovoltaic generation subsystem has
Work(power and power output.
The embodiment of the present invention realizes multiple photovoltaics by the control method based on the available peak power for concentrating inverter
Coordination control of the power generation sub-system under without communication condition, the autonomous of proof load power, reasonable distribution and photovoltaic micro system
The stabilization for voltage and the frequency of uniting, has plug and play and higher reliability.The stronger subsystem of source photovoltaic generation ability
The higher performance number of output, the weaker subsystem of source photovoltaic generation ability export lower performance number, ensure that all photovoltaics
Power generation sub-system remains identical margin of power, is easy to more preferable dynamic power to adjust；And because of photovoltaic generation subsystem
Power output it is uneven, cause the service life of part photovoltaic generation subsystem to shorten.Further, the embodiment of the present invention carries
The photovoltaic micro control method of confession, take into full account that the stable operation zone for concentrating inverter is limited with capacity, photovoltaic can be made
The working condition of power generation sub-system quickly returns to stabilization from unstable, better ensures that photovoltaic microgrid system voltage and frequency
Stabilization.
Finally, system provided by the invention is only preferable embodiment, is not intended to limit the scope of the present invention.
Within the spirit and principles of the invention, any modification, equivalent substitution and improvements made etc., it should be included in the present invention's
Within protection domain.
Claims (10)
- A kind of 1. photovoltaic microgrid system, it is characterised in that including：Multiple stage type photovoltaic generation subsystems in parallel；Any stage type photovoltaic generation subsystem, including：Multiple power optimization devices, multiple power optimization device control units, Concentrate inverter and concentrate inverter control unit；The multiple power optimization device series connection；Output end and the input of the concentration inverter after multiple power optimization device series connection End connection；Each corresponding power optimization device control unit of the power optimization device；The power optimization device control unit, For the output voltage according to the power optimization device, two kinds of different working modes are switched to, the power optimization device is carried out Hysteresis control；The concentration inverter control unit, for the available maximum active power according to the concentration inverter, to the collection The power output of middle inverter is controlled, with cause each stage type photovoltaic generation subsystem concentration inverter it is available most The difference of big active power and power output is equal.
- 2. photovoltaic microgrid system according to claim 1, it is characterised in that the concentration inverter control unit bag Include：Power computation module, power outer shroud control module, can use peak power dynamic pre-estimating module, voltage x current control module and PWM module；The power computation module, for the output voltage and output current according to the concentration inverter, obtain the concentration The active-power P of inverter output0And reactive power Q0；It is described to use peak power dynamic pre-estimating module, for according to it is described concentration inverter input current and input voltage, Obtain the available maximum active power of the concentration inverterWith available maximum reactive powerThe power outer shroud control module, for the active-power P exported according to the concentration inverter0, reactive power Q0, can With maximum active powerWith available maximum reactive powerObtain reference voltage Vrsinωrt；The voltage x current control module, for according to the reference voltage VrsinωrT, voltage ginseng in inverter in spanning set Examine signal；The PWM module, for modulating voltage reference signal in the concentration inverter, generate the concentration inverter Control signal.
- 3. photovoltaic microgrid system according to claim 2, it is characterised in that the power computation module obtains described Concentrate the active-power P of inverter output0And reactive power Q0Respectively<mrow> <msub> <mi>P</mi> <mi>o</mi> </msub> <mo>=</mo> <mfrac> <mrow> <msub> <mi>V</mi> <mrow> <mi>o</mi> <mi>a</mi> <mi>c</mi> </mrow> </msub> <msub> <mi>I</mi> <mrow> <mi>o</mi> <mi>a</mi> <mi>c</mi> </mrow> </msub> </mrow> <mrow> <mi>&tau;</mi> <mi>s</mi> <mo>+</mo> <mn>1</mn> </mrow> </mfrac> <mo>;</mo> <msub> <mi>Q</mi> <mi>o</mi> </msub> <mo>=</mo> <mfrac> <mrow> <msubsup> <mi>V</mi> <mrow> <mi>o</mi> <mi>a</mi> <mi>c</mi> </mrow> <mo>&prime;</mo> </msubsup> <msub> <mi>I</mi> <mrow> <mi>o</mi> <mi>a</mi> <mi>c</mi> </mrow> </msub> </mrow> <mrow> <mi>&tau;</mi> <mi>s</mi> <mo>+</mo> <mn>1</mn> </mrow> </mfrac> </mrow>Wherein, VoacTo concentrate the output voltage of inverter, IoacTo concentrate the output current of inverter, V 'oacFor VoacHysteresis 90 The voltage of degree, τ are LPF constant.
- 4. photovoltaic microgrid system according to claim 2, it is characterised in that described to use peak power dynamic pre-estimating mould The available maximum active power for the concentration inverter that block obtainsWith available maximum reactive powerRespectively：As the input voltage V of the concentration inverterbusLess than Vbus,minWhen, the available maximum active power for concentrating inverterWith available maximum reactive powerRespectively<mrow> <msubsup> <mi>P</mi> <mrow> <mi>max</mi> <mo>_</mo> <mi>t</mi> </mrow> <mo>*</mo> </msubsup> <mo>=</mo> <msub> <mi>P</mi> <mrow> <mi>r</mi> <mi>e</mi> <mi>a</mi> <mi>l</mi> <mi>t</mi> <mi>i</mi> <mi>m</mi> <mi>e</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>V</mi> <mrow> <mi>b</mi> <mi>u</mi> <mi>s</mi> </mrow> </msub> <msub> <mi>i</mi> <mrow> <mi>b</mi> <mi>u</mi> <mi>s</mi> </mrow> </msub> <mo>;</mo> <msubsup> <mi>Q</mi> <mrow> <mi>max</mi> <mo>_</mo> <mi>t</mi> </mrow> <mo>*</mo> </msubsup> <mo>=</mo> <msqrt> <mrow> <msubsup> <mi>S</mi> <mrow> <mi>m</mi> <mi>a</mi> <mi>x</mi> </mrow> <mn>2</mn> </msubsup> <mo>-</mo> <msubsup> <mi>P</mi> <mrow> <mi>max</mi> <mo>_</mo> <mi>t</mi> </mrow> <mrow> <mo>*</mo> <mn>2</mn> </mrow> </msubsup> </mrow> </msqrt> </mrow>Wherein,To concentrate the available maximum active power of inverter,To concentrate the available idle work(of maximum of inverter Rate, PrealtimeTo concentrate the realtime power of inverter, SmaxTo concentrate the maximum of inverter apparent capacity, Vbus,minTo concentrate The minimum output voltage that inverter allows, ibusTo concentrate the input current of inverter, VbusTo concentrate the input voltage of inverter；As the input voltage V of the concentration inverterbusHigher than Vbus,maxWhen, concentrate the available maximum active power of inverterWith available maximum reactive powerRespectively<mrow> <msubsup> <mi>P</mi> <mrow> <mi>max</mi> <mo>_</mo> <mi>t</mi> </mrow> <mo>*</mo> </msubsup> <mrow> <mo>(</mo> <mi>k</mi> <mo>+</mo> <mn>1</mn> <mo>)</mo> </mrow> <mo>=</mo> <msubsup> <mi>P</mi> <mrow> <mi>max</mi> <mo>_</mo> <mi>t</mi> </mrow> <mo>*</mo> </msubsup> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> </mrow><mrow> <msubsup> <mi>Q</mi> <mrow> <mi>max</mi> <mo>_</mo> <mi>t</mi> </mrow> <mo>*</mo> </msubsup> <mrow> <mo>(</mo> <mi>k</mi> <mo>+</mo> <mn>1</mn> <mo>)</mo> </mrow> <mo>=</mo> <msqrt> <mrow> <msubsup> <mi>S</mi> <mrow> <mi>m</mi> <mi>a</mi> <mi>x</mi> </mrow> <mn>2</mn> </msubsup> <mo>-</mo> <msubsup> <mi>P</mi> <mrow> <mi>max</mi> <mo>_</mo> <mi>t</mi> </mrow> <mrow> <mo>*</mo> <mn>2</mn> </mrow> </msubsup> <mrow> <mo>(</mo> <mi>k</mi> <mo>+</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow> </msqrt> </mrow>Wherein,The available maximum active power of inverter is concentrated when being clapped for kth,When being clapped for (k+1) The available maximum active power of inverter is concentrated,Concentrate the available maximum of inverter idle when being clapped for (k+1) Power, SmaxTo concentrate the maximum of inverter apparent capacity, Vbus,maxTo concentrate the maximum output voltage that inverter allows.
- 5. photovoltaic microgrid system according to claim 4, it is characterised in that what the power outer shroud control module obtained ω in the reference voltagerAnd VrRespectively<mrow> <msub> <mi>&omega;</mi> <mi>r</mi> </msub> <mo>=</mo> <msup> <mi>&omega;</mi> <mo>*</mo> </msup> <mo>-</mo> <mi>m</mi> <mrow> <mo>(</mo> <msub> <mi>P</mi> <mi>o</mi> </msub> <mo>-</mo> <msubsup> <mi>P</mi> <mrow> <mi>max</mi> <mo>_</mo> <mi>t</mi> </mrow> <mo>*</mo> </msubsup> <mo>)</mo> </mrow> <mo>+</mo> <mi>k</mi> <mrow> <mo>(</mo> <msub> <mi>V</mi> <mrow> <mi>b</mi> <mi>u</mi> <mi>s</mi> </mrow> </msub> <mo>-</mo> <msubsup> <mi>V</mi> <mrow> <mi>b</mi> <mi>u</mi> <mi>s</mi> </mrow> <mo>*</mo> </msubsup> <mo>)</mo> </mrow> </mrow><mrow> <msub> <mi>V</mi> <mi>r</mi> </msub> <mo>=</mo> <msup> <mi>V</mi> <mo>*</mo> </msup> <mo>-</mo> <mi>n</mi> <mrow> <mo>(</mo> <msub> <mi>Q</mi> <mi>o</mi> </msub> <mo>-</mo> <msubsup> <mi>Q</mi> <mrow> <mi>max</mi> <mo>_</mo> <mi>t</mi> </mrow> <mo>*</mo> </msubsup> <mo>)</mo> </mrow> </mrow>Wherein, ωr、VrRespectively concentrate the angular frequency and amplitude reference value of inverter output voltage, ω*、V*Respectively concentrate inverse Become the angular frequency and amplitude of device output voltage under rated condition, m, n are respectively to concentrate the sagging (P- of inverter active-angular frequency ω) and idle-voltage sagging (Q-V) sagging coefficient,Respectively concentrate the available maximum of inverter active Power and available maximum reactive power, Vbus、The input voltage and its nominal reference of inverter are respectively concentrated, k is tune Save coefficient.
- 6. photovoltaic microgrid system according to claim 4, it is characterised in that according to the input electricity of the concentration inverter Press nominal referenceThe minimum output voltage and the concentration inverter for determining the concentration inverter permission allow most Big output voltage.
- 7. photovoltaic microgrid system according to claim 1 or 2, it is characterised in that the power optimization device control unit, According to the output voltage of the power optimization device, two kinds of different working modes are switched to, are further comprised：As the output voltage V of the power optimization devicedcLess than Vdc,minWhen, the power optimization device control unit switches to maximum Power tracking mode of operation；Wherein, Vdc,minThe minimum output voltage allowed for power optimization device；As the output voltage V of the power optimization devicedcHigher than Vdc,maxWhen, the power optimization device control unit switches to straight-through Mode of operation；Wherein, Vdc,maxThe maximum output voltage allowed for power optimization device.
- 8. photovoltaic microgrid system according to claim 7, it is characterised in that according to the output of power optimization device electricity Press reference valueDetermine the minimum output voltage V that the power optimization device allowsdc,minAllow most with the power optimization device Big output voltage Vdc,max；The output voltage reference value of the power optimization deviceFor<mrow> <msubsup> <mi>V</mi> <mrow> <mi>d</mi> <mi>c</mi> </mrow> <mo>*</mo> </msubsup> <mo>=</mo> <mfrac> <msubsup> <mi>V</mi> <mrow> <mi>b</mi> <mi>u</mi> <mi>s</mi> </mrow> <mo>*</mo> </msubsup> <mi>n</mi> </mfrac> </mrow>Wherein,To concentrate the input voltage nominal reference of inverter, n is power in stage type off-network photovoltaic generation subsystem The total quantity of optimizer.
- A kind of 9. photovoltaic microgrid system control method, it is characterised in that including：For any photovoltaic generation subsystem,S1, the output voltage V according to concentration inverteroacWith output current Ioac, obtain the active of the concentration inverter output Power PoAnd reactive power Qo；S2, the input current i according to the concentration inverterbusWith input voltage Vbus, obtain the available of the concentration inverter Maximum active powerWith available maximum reactive powerS3, the active-power P according to the concentration invertero, reactive power Qo, maximum active power can be usedWith it is available most Big reactive powerObtain reference voltage Vrsinωrt；S4, according to the reference voltage VrsinωrT, generate the control signal for concentrating inverter.
- 10. photovoltaic microgrid system control method according to claim 9, it is characterised in that the step S4 is further Including：S41, according to the reference voltage VrsinωrT, voltage reference signal in inverter in spanning set；Voltage reference signal in S42, the modulation concentration inverter, generates the control signal for concentrating inverter.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107994614A (en) * | 2017-12-22 | 2018-05-04 | 上能电气股份有限公司 | A kind of collecting and distributing type photovoltaic inverting system cooperative control method |
| CN109787289A (en) * | 2019-03-15 | 2019-05-21 | 矽力杰半导体技术(杭州)有限公司 | Power conversion system, photovoltaic optimizer and power tracking method |
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| CN113992050A (en) * | 2021-10-19 | 2022-01-28 | 浙江腾圣储能技术有限公司 | Inverter circuit, inverter control method and photovoltaic system |
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| CN110474556A (en) * | 2018-05-10 | 2019-11-19 | Ls产电株式会社 | Inverter control method |
| CN110474556B (en) * | 2018-05-10 | 2021-05-14 | Ls产电株式会社 | Inverter control method |
| CN109787289A (en) * | 2019-03-15 | 2019-05-21 | 矽力杰半导体技术(杭州)有限公司 | Power conversion system, photovoltaic optimizer and power tracking method |
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| CN111009918A (en) * | 2019-12-13 | 2020-04-14 | 珠海格力电器股份有限公司 | Method and device for controlling power optimizer in photovoltaic grid-connected system |
| CN113992050A (en) * | 2021-10-19 | 2022-01-28 | 浙江腾圣储能技术有限公司 | Inverter circuit, inverter control method and photovoltaic system |
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