CN110417055A - A kind of direct Power Control method inhibiting the fluctuation of photovoltaic combining inverter DC side busbar voltage - Google Patents
A kind of direct Power Control method inhibiting the fluctuation of photovoltaic combining inverter DC side busbar voltage Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention discloses a kind of direct Power Control methods of inhibition photovoltaic combining inverter DC side busbar voltage fluctuation, belong to current transformer control technology field；Method includes the following steps: establishing photovoltaic generating system, power grid instantaneous active component v is determinedα、iαWith instantaneous reactive component vβ、iβ, using fixed step size perturbation observation method, realize the MPPT maximum power point tracking of photovoltaic array, by disturbance observer, be corrected link, determine power of disturbanceBy the output signal of two PI controllersFeedforward Decoupling model is constructed respectively as the input of feedforward decoupling controller, is based on network voltage vα、vβ, in conjunction with the output u of Feedforward Decoupling systemP、uQ, obtain voltage control signal eαAnd eβ, to voltage control signal eαAnd eβα β/abc transformation is carried out, the SPWM control signal e of inverter is obtaineda,b,c, the present invention introduces feedforward disturbance quantity in outer voltage, using simple proportional controller, that is, can guarantee the zero steady-state error tracking of DC bus-bar voltage；The phase information for not needing acquisition network voltage, does not need to synchronize rotating coordinate transformation, so as to avoid because of stability problem caused by using phaselocked loop (PLL) yet.
Description
Technical field
The invention belongs to current transformer control technology fields, and in particular to a kind of inhibition photovoltaic combining inverter direct current side bus
The direct Power Control method of voltage fluctuation.
Background technique
With the fast development of the renewable energy technologies such as wind-powered electricity generation, solar power generation, photovoltaic combining inverter control is had become
For the hot spot of research.Interface arrangement of the inverter as renewable energy and power grid, control performance directly affect grid-connected electric energy
Quality and grid connection efficiency.
Photovoltaic DC-to-AC converter is in grid-connected state, influence of the DC side busbar voltage vulnerable to active power fluctuation.In order to
Realize that sine-converter, DC bus-bar voltage must be controlled in the reasonable scope and be kept relative stability.DC bus-bar voltage is excessively high,
It can trigger protection device action；It is too low to will lead to power and flow to DC side from grid side, it can not achieve sine-converter.As it can be seen that straight
Busbar voltage control technology is flowed in terms of guaranteeing power quality and power network safety operation, is played an important role.Currently, needle
Control to photovoltaic combining inverter, generally using the double circle structure of outer voltage, current inner loop.In double circle structure,
Outer ring controls busbar voltage, inner ring then is used to track the output current-order of outer ring by pi regulator.According to instantaneous
Power Theory, only a poor voltage coefficient is in essence equal to defeated the control of grid-connected current between electric current and power
The control of power out.Based on this, there is scholar to use for reference the basic ideas of Direct Torque Control in motor driven theory, propose to inversion
The method that device or rectifier carry out direct Power Control, this method replace current inner loop using power inner ring, have power factor
High, advantages of simple structure and simple.
When photovoltaic inverting system exist disturb, when changing such as intensity of illumination, for improve busbar voltage control performance,
Inhibit its fluctuation, scholar proposes that the method that forward feedback correction is applied in outer voltage, this method need to increase additional sensor
It obtains the relevant information of DC power supply and load, increases system design and use cost.Then, scholar proposes a kind of base
In the control method of extended state observer, this method is compared with the traditional method, and does not need directly to measure current perturbation,
It can inhibit influence of the external disturbance to system, there is stronger robustness to uncertain disturbance and Parameters variation.But the party
Method is ratio resonant controller used in the interior loop back path, needs that power reference amount is first converted into corresponding current reference
Amount, then again controls the magnitude of current, this adds increased the computational burdens of system.It is mixed in addition, there are also scholars for alternating current-direct current
Microgrid is closed, proposes the control strategy based on nonlinear disturbance observer, it has been proved by practice that the observer has good dynamic product
Matter.
Summary of the invention
According to problem of the existing technology, the invention discloses a kind of inhibition photovoltaic combining inverter direct current side bus electricity
The direct Power Control method for pressing fluctuation, includes the following steps:
S1: establishing photovoltaic generating system, and the photovoltaic generating system includes photovoltaic array, boosting boost circuit, inversion
Device, filter inductance, MPPT controller, control system and power grid between the photovoltaic array and boosting boost circuit and boost
Pass through capacitance connection between circuit and inverter；The input terminal of the MPPT controller is connected with photovoltaic array, the MPPT
The output end of controller is connected with boosting boost circuit；The input terminal of the control system is connected with power grid, the control
The output end of system is connected with inverter；
S2: the voltage U of voltage sensor detection photovoltaic array is utilizedpv, DC bus-bar voltage UdcWith network voltage va,b,c,
Utilize the output electric current I of current sensor detection photovoltaic arraypvWith current on line side ia,b,c, respectively to three-phase voltage and three-phase electricity
Stream carries out abc/ α β transformation, obtains the instantaneous active component v on α β axisα、iαWith instantaneous reactive component vβ、iβ；
S3: change the defeated of photovoltaic array using fixed step size perturbation observation method, by changing the duty ratio of switching tube
Voltage out, and carry out the MPPT maximum power point tracking of photovoltaic array；
S4: according to instantaneous active component vα、iαWith instantaneous reactive component vβ、iβ, calculate grid-connected active-power PgWith grid-connected nothing
Function power Qg, square based on DC bus-bar voltageWith grid-connected active-power Pg, disturbed by nonlinear disturbance observer
Dynamic powerBy itself and amendment link Gch(s) after being multiplied, revised power of disturbance is obtained
S5: by square of DC bus-bar voltage detected valueWith square of DC bus-bar voltage given valueAfter making difference,
Obtain error controling signalBy outer voltage P adjuster to error signal edcClosed-loop process is carried out, it will
Outer voltage P adjuster output quantity and power of disturbanceIt is added, obtains inverter active power given value
S6: by given active powerWith active power of output PgDifference, the given reactive power subtracted each otherWith output nothing
Function power QgThe difference signal subtracted each other obtains defeated respectively as the input of the active PI controller of inner ring and the idle PI controller of inner ring
Signal outWherein, the instantaneous reactive power reference that setting gird-connected inverter exports
S7: by the output signal of the active PI controller of above-mentioned inner ring and the idle PI controller of inner ringRespectively as
The input signal of feedforward decoupling controller constructs Feedforward Decoupling model, is based on network voltage vα、vβ, in conjunction with Feedforward Decoupling system
Output uP、uQ, obtain voltage control signal eαAnd eβ；
S8: to voltage control signal eαAnd eβα β/abc transformation is carried out, the SPWM control signal e of inverter is obtaineda、eb、ec。
Further, power of disturbance is obtained by nonlinear disturbance observerProcess, comprising the following steps:
S4-1: dc-link capacitance C and RlThe active power of consumption and grid-connected active-power PgDynamical equation are as follows:
Wherein: C is dc-link capacitance, UdcFor DC bus-bar voltage, RlIndicate the loss of rear class inverter, PsTo flow through
The dc power of booster circuit, PgFor grid-connected active power, QgFor simultaneously network reactive power；
S4-2: above formula (1) is rewritten into following form:
Wherein: x1And x2For state variable, control input quantity is uP=vαeα+vβeβ, PsIt is defined as disturbance variable；
S4-3: the nonlinear disturbance observer of estimation external disturbance d (t) can be used following equation to describe:
Wherein: z is nonlinear disturbance observer intermediate state amount,For the estimated value of disturbance variable, nonlinear disturbance
Observer gain is l (x)=[l1l2], wherein l1、l2Indicate the gain of nonlinear disturbance observer, p (x) needs design
Observation function may be expressed as: p (x)=l1x1+l2x2；
S4-4: observer gain l is taken1> 0, l2=0, above formula (3) is writeable are as follows:
Wherein:For disturbance variable PsEstimated value.
Further, the disturbance observer observationWith true value PsBetween there are following relationships:
Wherein: TobFor the time constant of nonlinear disturbance observer, value is equal to C/2l1。
Further, active power given valueIt is calculated by following formula (6):
Wherein: KpFor the gain of outer voltage P adjuster, edcFor error controling signal, value is equal toGch(s) transmission function of link is corrected for observation error；
Wherein: TchFor derivative time constant.
Further, the input of feedforward decoupling controllerIt is calculated by following formula (8):
Wherein: KP,pFor the proportional gain of active power inner ring pi regulator, KP,iFor active power inner ring pi regulator
Integral gain, KQ,pFor the proportional gain of reactive power inner ring pi regulator, KQ,iFor the integral of reactive power inner ring pi regulator
Gain, ePFor active power regulation error, eQError is adjusted for reactive power, is calculated by following formula (9):
Wherein:For reactive power given value, value 0.
Further, the output signal u of the feedforward decoupling controllerP、uQIt is calculated by following formula (10):
Or it indicates are as follows:
Wherein: ed、eqFor component of the inverter output voltage on dq axis.
Further, signal e is controlledα、eβIt is calculated by following formula (12):
Wherein: uP、uQFor the output signal of feedforward decoupling controller, vα、vβFor component of the network voltage on α β axis, VgFor
The amplitude of three-phase equilibrium network voltage.
Further, SPWM controls signal ea, eb, ecIt is calculated by following formula (13):
The direct Power Control method provided by the present invention for inhibiting the fluctuation of photovoltaic combining inverter DC side busbar voltage,
Obtain DC bus-bar voltage and net side power by sampling, using nonlinear disturbance observer, realize to interference volume it is quick with
Track；The present invention introduces feedforward disturbance quantity in outer voltage, using simple proportional controller, that is, can guarantee DC bus-bar voltage
Zero steady-state error tracking；The present invention uses the direct Power Control method modulated based on network voltage, can to net side power into
Row real-time control is realized to the Fast-Balance of DC source input power and output AC power, reduces the width of busbar voltage fluctuation
Degree；The present invention does not need to obtain the phase information of network voltage, does not need to synchronize rotating coordinate transformation yet, so as to avoid
Because of stability problem caused by using phaselocked loop (PLL).
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The some embodiments recorded in application, for those of ordinary skill in the art, without creative efforts,
It is also possible to obtain other drawings based on these drawings.
Fig. 1 is conventional photovoltaic gird-connected inverter control program schematic diagram；
Fig. 2 is structural schematic diagram of the invention；
Fig. 3 is photovoltaic combining inverter control program schematic diagram of the present invention；
When Fig. 4 (a) is 4s, intensity of illumination changes, photovoltaic panel output power waveform diagram；
When Fig. 4 (b) is 4s, intensity of illumination changes, photovoltaic panel output voltage waveform；
When Fig. 4 (c) is 4s, intensity of illumination changes, photovoltaic panel output current wave figure；
When Fig. 5 (a) is 4s, intensity of illumination changes, using the photovoltaic combining inverter DC side of traditional control method
Busbar voltage simulation waveform；
When Fig. 5 (b) is 4s, intensity of illumination changes, using the grid-connected electricity of the photovoltaic combining inverter of traditional control method
Pressure and current simulations waveform diagram；
When Fig. 5 (c) is 4s, intensity of illumination changes, using the grid-connected function of the photovoltaic combining inverter of traditional control method
Rate simulation waveform；
When Fig. 6 (a) is 4s, intensity of illumination changes, using the photovoltaic combining inverter direct current of control method of the present invention
Side bus voltage simulation waveform；
When Fig. 6 (b) is 4s, intensity of illumination changes, and the photovoltaic combining inverter using control method of the present invention is grid-connected
Voltage and current simulation waveform；
When Fig. 6 (c) is 4s, intensity of illumination changes, and the photovoltaic combining inverter using control method of the present invention is grid-connected
Simulation of SAR power image waveform diagram；
When Fig. 7 (a) is 4s, intensity of illumination changes, and when filter inductance becomes 18mH from 23mH, other parameters are constant,
Using the photovoltaic combining inverter DC side busbar voltage simulation waveform of traditional control method；
When Fig. 7 (b) is 4s, intensity of illumination changes, and when filter inductance becomes 18mH from 23mH, other parameters are constant,
Using the photovoltaic combining inverter grid-connected voltage and current simulations waveform diagram of traditional control method；
When Fig. 7 (c) is 4s, intensity of illumination changes, and when filter inductance becomes 18mH from 23mH, other parameters are constant,
Using the grid-connected Simulation of SAR power image waveform diagram of the photovoltaic combining inverter of traditional control method；
Fig. 8 (a) is that photovoltaic panel output power is constant, and when 10s, network voltage rises sharply 10%, and other parameters are constant, using this
The photovoltaic combining inverter DC side busbar voltage simulation waveform of invention control method；
Fig. 8 (b) is that photovoltaic panel output power is constant, and when 10s, network voltage rises sharply 10%, and other parameters are constant, using this
The photovoltaic combining inverter grid-connected voltage and current simulations waveform diagram of invention control method；
Fig. 8 (c) is that photovoltaic panel output power is constant, and when 10s, network voltage rises sharply 10%, and other parameters are constant, using this
The grid-connected Simulation of SAR power image waveform diagram of the photovoltaic combining inverter of invention control method.
Specific embodiment
In order to which the present invention is more specifically described, with reference to the accompanying drawing and specific embodiment inhibits grid-connected to the present invention
The direct Power Control method of inverter direct-flow side busbar voltage fluctuation is described in detail.
Fig. 1 is conventional photovoltaic gird-connected inverter control program schematic diagram, and Fig. 2 is structural schematic diagram of the invention, and Fig. 3 is this
Invention photovoltaic combining inverter control program schematic diagram；The present invention inhibits the fluctuation of photovoltaic combining inverter DC side busbar voltage
Direct Power Control method, includes the following steps:
S1: establishing photovoltaic generating system, and the photovoltaic generating system includes photovoltaic array, boosting boost circuit, 17kW
Gird-connected inverter, filter inductance, MPPT controller, control system and power grid, between the photovoltaic array and boosting boost circuit
And and booster circuit and inverter between pass through capacitance connection；The input terminal of the MPPT controller is connected with photovoltaic array
It connects, the output end of the MPPT controller is connected with boosting boost circuit；The input terminal of the control system is connected with power grid
It connects, the output end of the control system is connected with inverter；Photovoltaic array parameter is set as Voc=450V, Isc=60A, it is maximum
V at power pointsmpp=350V, Impp=45A.
S2: the output voltage U of Hall voltage sensor acquisition photovoltaic array is utilizedpv, DC bus-bar voltage UdcWith power grid
Voltage va,b,c, utilize the output electric current I of Hall current sensor acquisition photovoltaic arraypvWith current on line side ia,b,c, to three-phase equilibrium
Network voltage, three-phase carry out abc/ α β transformation, obtain the instantaneous active component v on α β axisα、iαWith instantaneous reactive component vβ、iβ；α
β transformation matrix of coordinates is as follows:
Expression formula of the three-phase equilibrium network voltage under α β coordinate system are as follows:
Wherein: VgFor the amplitude of three-phase equilibrium network voltage, ω is the angular frequency of network voltage；In present embodiment, three
The network voltage virtual value that balances each other is 220V, the π of ω=2 f, f=50Hz, VgTake 179.6V.
S3: MPPT maximum power point tracking is carried out to photovoltaic array using the perturbation observation method of fixed step size, MPPT algorithm is adopted
Sample cycle TaIt is calculated by following formula (3):
Wherein: L0For boost inductance value, C0Indicate the filtering capacitance of boost circuit, RLFor the dead resistance on inductance, k
It is current changing rate to the ratio of voltage change ratio, it will be assumed that in constant pressure source region, < -1 k <, in constant current source region, k ≈ 0；This reality
It applies in mode, L0For 5mH, C0For 550 μ F, RL0 is taken for 300 Ω, k, disturbance step-length takes 5 × 10-4, the sampling period is 1.67 × 10-4s。
S4: instantaneous active power P and instantaneous reactive power Q are calculate by the following formula:
Wherein: iαAnd iβFor the current on line side after coordinate transform.
The resistance value for ignoring filter inductance, can be expressed as:
Wherein: L is filter inductance value, eα, eβFor the α β component of inverter output voltage.
Square based on DC bus-bar voltageWith grid-connected active-power Pg, power of disturbance is obtained by disturbance observerBy itself and amendment link Gch(s) after being multiplied, revised power of disturbance is obtainedIt is calculated by disturbance observerBelow
Several steps:
S4-1: firstly, bus capacitor C and RlThe dynamical equation of the active power of consumption and grid-connected active power are as follows:
S4-2: wherein: C is dc-link capacitance, UdcFor DC bus-bar voltage, RlIndicate the loss of rear class inverter, Ps
For the dc power for flowing through booster circuit, PgFor grid-connected active power；In present embodiment, C takes 3300 μ F, RlTake 1000 Ω；
In turn, above formula (6) is written as follow form:
Wherein: x1And x2For state variable, uPTo control input quantity, PsFor disturbance quantity；In present embodiment, L takes 23mH.
S4-3: the nonlinear disturbance observer of estimation external disturbance d (t) can be used following equation to describe:
Wherein: z is the intermediate state amount of observer,For the estimated value of disturbance variable, observer gain be l (x)=
[l1l2], p (x) is the observation function for needing to design, and may be expressed as: p (x)=l1x1+l2x2；
S4-4: observer gain l is taken1> 0, l2=0, the expression formula (9) of nonlinear disturbance observer are as follows:
Wherein:For disturbance variable PsEstimated value.
Further, the disturbance observer observationWith true value PsBetween there are following relationships:
Wherein: TobFor the time constant of nonlinear disturbance observer, value is equal to C/2l1。
S5: by square of DC bus-bar voltage detected valueWith square of DC bus-bar voltage given valueAfter making difference,
Obtain error controling signalBy P adjuster to error signal edcClosed-loop process is carried out, P adjuster is defeated
Output and power of disturbanceIt is added, obtains inverter active power given valueActive power given value P*Pass through following formula (11)
It calculates:
Wherein: KpFor the gain of outer voltage P adjuster, edcFor error controling signal, value is equal toGch(s) transmission function of link is corrected for observation error；In present embodiment, Kp0.5 is taken,Correct the transmission function G of linkch(s)=0.05s+1.
The Gch(s) it is calculated by following formula (12):
Wherein: KP,p、KP,iThe respectively ratio and the differential gain of active power inner ring pi regulator.
The Gch(s) expression formula can simplify are as follows:
Wherein: TchFor derivative time constant.
S6: by given active powerWith active power of output PgDifference, the given reactive power subtracted each otherWith output nothing
Function power QgThe difference signal subtracted each other makees the input of the active PI controller of inner ring and the idle PI controller of inner ring respectively, is exported
SignalWherein, the instantaneous reactive power reference that setting gird-connected inverter exports
S7: by the output signal of the active PI controller of above-mentioned inner ring and the idle PI controller of inner ringRespectively as
The input signal of feedforward decoupling controller constructs Feedforward Decoupling model, the input of feedforward decoupling controllerUnder
Formula (14) calculates:
Wherein: ePAnd eQFor power regulation error, calculated by following formula (15):
Wherein: KP,p、KP,i、KQ,p、KQ,iWithValue be respectively 40,19893,40,19893 and 0.
S7: it is based on network voltage vα、vβ, in conjunction with the output u of Feedforward Decoupling systemP、uQ, obtain voltage control signal eαWith
eβ；The output u of feedforward decoupling controllerP、uQIt is calculated by following formula (16):
Wherein:For the input of feedforward decoupling controller.
Further: the output u of feedforward decoupling controllerP、uQIt is also denoted as:
Wherein: ed、eqFor component of the inverter output voltage on dq axis.
Control signal eα、eβIt is calculated by following formula (18):
Wherein: uP、uQFor the output of feedforward decoupling controller, vα、vβFor component of the network voltage on α β axis.
S8: to voltage control signal uαAnd uβα β/abc transformation is carried out, obtains the SPWM signal of inverter, and then to grid-connected
Switching device in inverter is controlled, and α β/abc transformation matrix is Tabc/αβInverse matrix.
We are emulated to using the photovoltaic combining inverter of present embodiment below.
When Fig. 4 (a) is 4s, intensity of illumination changes, photovoltaic panel output power waveform diagram；When Fig. 4 (b) is 4s, illumination
Intensity changes, photovoltaic panel output voltage waveform；When Fig. 4 (c) is 4s, intensity of illumination changes, photovoltaic panel output electricity
Flow waveform diagram；In 4s, intensity of illumination changes, and photovoltaic panel output power becomes 16kW from 8kW；
When Fig. 5 (a) is 4s, intensity of illumination changes, using the photovoltaic combining inverter DC side of traditional control method
Busbar voltage simulation waveform；When Fig. 5 (b) is 4s, intensity of illumination changes, using the grid-connected inverse of traditional control method
Become device grid-connected voltage and current simulations waveform diagram；When Fig. 5 (c) is 4s, intensity of illumination changes, using traditional control method
The grid-connected Simulation of SAR power image waveform diagram of photovoltaic combining inverter；
When Fig. 6 (a) is 4s, intensity of illumination changes, using the photovoltaic combining inverter direct current of control method of the present invention
Side bus voltage simulation waveform；Fig. 6 (b) be 4s when, intensity of illumination changes, using control method of the present invention photovoltaic simultaneously
Net grid-connected inverters voltage and current simulation waveform；When Fig. 6 (c) is 4s, intensity of illumination changes, and is controlled using the present invention
The grid-connected Simulation of SAR power image waveform diagram of the photovoltaic combining inverter of method；
When intensity of illumination changes, system controls plan using traditional voltage, current double closed-loop there are when step disturbance
Slightly, busbar voltage fluctuation range is big, and compared with present embodiment, there are serious overshoot, and convergence rate is slow；Using the present invention
There is about 110V overshoot, stable state can be reached merely through 0.8s in mentioned control method, busbar voltage.
When Fig. 7 (a) is 4s, intensity of illumination changes, and when filter inductance becomes 18mH from 23mH, other parameters are constant,
Using the photovoltaic combining inverter DC side busbar voltage simulation waveform of traditional control method；When Fig. 7 (b) is 4s, illumination is strong
Degree changes, and when filter inductance becomes 18mH from 23mH, other parameters are constant, using the grid-connected inverse of traditional control method
Become device grid-connected voltage and current simulations waveform diagram；When Fig. 7 (c) is 4s, intensity of illumination changes, and filter inductance is become from 23mH
When 18mH, other parameters are constant, using the grid-connected Simulation of SAR power image waveform diagram of the photovoltaic combining inverter of traditional control method；It can see
Changing filter inductance value out, other parameters remain unchanged, and using the mentioned control method of the present invention, the response speed of system is slack-off,
Time needed for reaching stable state is elongated, but there is no significant changes for overall performance.
Fig. 8 (a) is that photovoltaic panel output power is constant, and when 10s, network voltage rises sharply 10%, and other parameters are constant, using this
The photovoltaic combining inverter DC side busbar voltage simulation waveform of invention control method；Fig. 8 (b) is that photovoltaic panel output power is permanent
Fixed, when 10s, network voltage rises sharply 10%, and other parameters are constant, and the photovoltaic combining inverter using control method of the present invention is grid-connected
Voltage and current simulation waveform；Fig. 8 (c) is that photovoltaic panel output power is constant, and when 10s, network voltage rises sharply 10%, other ginsengs
Number is constant, using the grid-connected Simulation of SAR power image waveform diagram of the photovoltaic combining inverter of control method of the present invention, it can be seen that photovoltaic panel is defeated
Power invariability out, network voltage rises sharply 10% when 10s, and other parameters are constant, using the mentioned control method of the present invention, busbar voltage
There are small overshoot with active power, and after Network Voltage Stability, system can be rapidly achieved stable state.
In conclusion present embodiment is not necessarily to obtain the phase information of power grid, do not need to synchronize rotational coordinates change yet
It changes, structure is simple, and dynamic response performance is superior；DC bus-bar voltage and net side power are obtained by sampling, is disturbed using non-linear
The quick tracking to interference volume may be implemented in observer, has stronger robustness for uncertain disturbance and Parameters variation；
Using the direct Power Control method modulated based on network voltage, real-time control can be carried out to net side power, realized to DC source
The Fast-Balance of input power and output AC power effectively inhibits the fluctuation of DC bus-bar voltage.
Claims (8)
1. a kind of direct Power Control method for inhibiting the fluctuation of photovoltaic combining inverter DC side busbar voltage, it is characterised in that:
Include the following steps:
S1: establishing photovoltaic generating system, and the photovoltaic generating system includes photovoltaic array, boosting boost circuit, inverter, filter
Wave inductance, MPPT controller, control system and power grid, the photovoltaic array and boosting boost circuit between and booster circuit
Pass through capacitance connection between inverter；The input terminal of the MPPT controller is connected with photovoltaic array, the MPPT control
The output end of device is connected with boosting boost circuit；The input terminal of the control system is connected with power grid, the control system
Output end be connected with inverter；
S2: the voltage U of voltage sensor detection photovoltaic array is utilizedpv, DC bus-bar voltage UdcWith network voltage va,b,c, utilize
The output electric current I of current sensor detection photovoltaic arraypvWith current on line side ia,b,c, respectively to three-phase voltage and three-phase current into
Row abc/ α β transformation, obtains the instantaneous active component v on α β axisα、iαWith instantaneous reactive component vβ、iβ；
S3: change the output electricity of photovoltaic array using fixed step size perturbation observation method, by changing the duty ratio of switching tube
Pressure, and carry out the MPPT maximum power point tracking of photovoltaic array；
S4: according to instantaneous active component vα、iαWith instantaneous reactive component vβ、iβ, calculate grid-connected active-power PgWith grid-connected idle function
Rate Qg, square based on DC bus-bar voltageWith grid-connected active-power Pg, disturbance function is obtained by nonlinear disturbance observer
RateBy itself and amendment link Gch(s) after being multiplied, revised power of disturbance is obtained
S5: by square of DC bus-bar voltage detected valueWith square of DC bus-bar voltage given valueAfter making difference, obtain
Error controling signalBy outer voltage P adjuster to error signal edcClosed-loop process is carried out, by voltage
Outer ring P adjuster output quantity and power of disturbanceIt is added, obtains inverter active power given value
S6: by given active powerWith active power of output PgDifference, the given reactive power subtracted each otherWith the idle function of output
Rate QgThe difference signal subtracted each other obtains output letter respectively as the input of the active PI controller of inner ring and the idle PI controller of inner ring
NumberWherein, the instantaneous reactive power reference that setting gird-connected inverter exports
S7: by the output signal of the active PI controller of above-mentioned inner ring and the idle PI controller of inner ringIt is solved respectively as feedforward
The input signal of coupling controller constructs Feedforward Decoupling model, is based on network voltage vα、vβ, in conjunction with the output of Feedforward Decoupling system
uP、uQ, obtain voltage control signal eαAnd eβ；
S8: to voltage control signal eαAnd eβα β/abc transformation is carried out, the SPWM control signal e of inverter is obtaineda、eb、ec。
2. the method according to claim 1, wherein obtaining power of disturbance by nonlinear disturbance observerIt crosses
Journey, comprising the following steps:
S4-1: dc-link capacitance C and RlThe active power of consumption and grid-connected active-power PgDynamical equation are as follows:
Wherein: C is dc-link capacitance, UdcFor DC bus-bar voltage, RlIndicate the loss of rear class inverter, PsTo flow through boosting
The dc power of circuit, PgFor grid-connected active power, QgFor simultaneously network reactive power；
S4-2: above formula (1) is rewritten into following form:
Wherein: x1And x2For state variable, control input quantity is uP=vαeα+vβeβ, PsIt is defined as disturbance variable；
S4-3: the nonlinear disturbance observer of estimation external disturbance d (t) can be used following equation to describe:
Wherein: z is nonlinear disturbance observer intermediate state amount,For the estimated value of disturbance variable, nonlinear disturbance observer
Gain is l (x)=[l1 l2], wherein l1、l2Indicate the gain of nonlinear disturbance observer, p (x) is the observation letter for needing to design
Number, may be expressed as: p (x)=l1x1+l2x2；
S4-4: observer gain l is taken1> 0, l2=0, above formula (3) is writeable are as follows:
Wherein:For disturbance variable PsEstimated value.
3. the method according to claim 1, wherein the disturbance observer observationWith true value PsBetween
There are following relationships:
Wherein: TobFor the time constant of nonlinear disturbance observer, value is equal to C/2l1。
4. the method according to claim 1, wherein active power given valueIt is calculated by following formula (6):
Wherein: KpFor the gain of outer voltage P adjuster, edcFor error controling signal, value is equal toGch
(s) transmission function of link is corrected for observation error；
Wherein: TchFor derivative time constant.
5. the method according to claim 1, wherein the input of feedforward decoupling controller Pass through following formula (8)
It calculates:
Wherein: KP,pFor the proportional gain of active power inner ring pi regulator, KP,iFor the integral of active power inner ring pi regulator
Gain, KQ,pFor the proportional gain of reactive power inner ring pi regulator, KQ,iFor the integral gain of reactive power inner ring pi regulator,
ePFor active power regulation error, eQError is adjusted for reactive power, is calculated by following formula (9):
Wherein:For reactive power given value, value 0.
6. the method according to claim 1, wherein the output signal u of the feedforward decoupling controllerP、uQPass through
Following formula (10) calculates:
Or it indicates are as follows:
Wherein: ed、eqFor component of the inverter output voltage on dq axis.
7. the method according to claim 1, wherein control signal eα、eβIt is calculated by following formula (12):
Wherein: uP、uQFor the output signal of feedforward decoupling controller, vα、vβFor component of the network voltage on α β axis, VgFor three-phase
Balance the amplitude of network voltage.
8. the method according to claim 1, wherein SPWM controls signal ea, eb, ecIt is calculated by following formula (13):
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