CN104953801B - Voltage-source type combining inverter current harmonics elimination device and method - Google Patents
Voltage-source type combining inverter current harmonics elimination device and method Download PDFInfo
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Abstract
The present invention provides a kind of voltage-source type combining inverter current harmonics elimination device and method.The device includes：Net side sampler, for being sampled to obtain voltage on line side sampled signal to voltage on line side；First inverter sampler, is sampled to obtain contravarianter voltage sampled signal and inverter current sampled signal for the output voltage and output current to inverter；Voltage on line side processor, for N number of harmonic component of voltage on line side sampled signal to be separated with fundamental component；Phaselocked loop, amplitude and phase for detecting fundamental component；Power control loop, for calculating amplitude regulated quantity and phase adjusted amount；Reference signal synthesizer, for generating contravarianter voltage reference signal；And inverter control loop, for controlling inverter so that output voltage follows contravarianter voltage reference signal.According to the present invention it is possible to effectively suppress content of the voltage-source type combining inverter to the harmonic current of electrical grid transmission.
Description
Technical field
The present invention relates to technical field of inverter control, in particular it relates to a kind of voltage-source type combining inverter harmonic wave is electric
Stream restraining device and method.
Background technology
In recent years, as the fossil fuels such as traditional coal and oil increasingly exhaust, energy shortage and environmental problem constantly add
It is acute so that clean energy resource or renewable energy power generation technology obtain increasingly extensive attention and application.Greatly develop new energy and
Regenerative resource, is not only the need for preserving the ecological environment, tackle climate change, realizing sustainable development, is also to solve China
Main path without electric population people electrical problem from far-off regions.
By taking photovoltaic as an example, its principal mode for generating electricity by way of merging two or more grid systems is to utilize the inverter with power electronic devices as core, will
The DC conversion that photovoltaic battery panel is produced is the acceptable alternating current form of power network, and electric energy is injected into power network.According to inverse
Become device output end characteristic, current source type combining inverter and voltage-source type combining inverter can be divided into.Wherein, current source type is grid-connected
Inverter development is relatively early, and range of application is wider, and its operation principle is：Inverter control loop is only to the output current of inverter
It is controlled, the output voltage of inverter carries out clamper by power network, while current controlled circuit carries out maximum to photovoltaic battery panel
Power tracking, power network is injected by photovoltaic energy to greatest extent.Because there is larger randomness, therefore grid-connected system in solar irradiance
Output-power fluctuation is larger, is unfavorable for the stabilization of power grids.The advantage of this system is that control is simple, inverter output current waveform compared with
It is good, input current total harmonic distortion (THDi) relatively low.But, it has the disadvantage when the grid collapses, and current source type is grid-connected inverse
Becoming device system cannot realize islet operation and into sensitive load is powered.The appearance of voltage-source type grid-connected inverter system is later, its
Operation principle is the amplitude and phase by controlling the output voltage of inverter, according to power transfer theorem, control inverter to
The active power and reactive power of electrical grid transmission.The characteristics of voltage-source type grid-connected inverter system be inverter control loop most
Outer layer is voltage control, therefore, when power network breaks down, voltage-source type grid-connected inverter system can off-grid immediately, and continue
For sensitive load provides electric energy.Because voltage-source type grid-connected inverter system is in grid-connected and off-grid transfer process, its control ring
The structure on road does not change, and transient process impact is smaller, and the quality of power supply is higher, therefore voltage-source type combining inverter can be carried
It is upgraded to the reliability that sensitive load is powered.But because the output impedance of voltage-source type combining inverter is smaller, it is vulnerable to net side
Harmonic voltage influences, therefore causes its grid-connected current THDiIncrease, impacts to the grid-connected current quality of power supply.
Accordingly, it is desirable to provide a kind of voltage-source type combining inverter current harmonics elimination strategy, to solve at least in part
The above-mentioned problems in the prior art.
The content of the invention
In order to solve problems of the prior art at least in part, according to an aspect of the present invention, there is provided a kind of
Voltage-source type combining inverter current harmonics elimination device.The device includes：Net side sampler, it is used to carry out voltage on line side
Sample to obtain voltage on line side sampled signal；First inverter sampler, it is used for output voltage and output electricity to inverter
Stream is sampled to obtain contravarianter voltage sampled signal and inverter current sampled signal；Voltage on line side processor, it is used for
N number of harmonic component of voltage on line side sampled signal is separated with fundamental component, wherein N is greater than the integer equal to 1；Phaselocked loop,
Its amplitude E for being used to detect fundamental componentbaseAnd phase thetabase；Power control loop, it is used to be sampled based on contravarianter voltage and believed
Number, inverter current sampled signal, target active power and target reactive power calculate amplitude regulated quantity Δ E and phase adjusted amount
Δθ；Reference signal synthesizer, it is used for based on amplitude Ebase, phase thetabase, amplitude regulated quantity Δ E, phase adjusted amount Δ θ and N
Individual harmonic component generates contravarianter voltage reference signal；And inverter control loop, it is used to control inverter so that output
Voltage follow contravarianter voltage reference signal.
Alternatively, voltage on line side processor includes N groups trapper and subtracter.The N groups trapper is used for correspondingly
Filter N number of harmonic component, to obtain fundamental component, wherein the center resonance angular frequency of each trapper in every group of trapper and
The angular frequency of harmonic component corresponding with this group of trapper is identical.The subtracter is used to subtract base from voltage on line side sampled signal
Frequency component, to obtain N number of harmonic component.
Alternatively, the device further includes compensator.The compensator is used for angular frequency and N groups based on fundamental component to fall into
The amplitude that the transmission function of each trapper in ripple device calculates for compensating the influence that N groups trapper is caused to fundamental component is mended
The amount of repaying EoffsetWith phase compensation amount θoffset, and be further used for being based respectively on amplitude compensation amount EoffsetAnd phase compensation amount
θoffsetTo amplitude EbaseAnd phase thetabaseCompensate.
Alternatively, the trapper of the harmonic component for filtering same phase voltage on line side in N groups trapper is connected in series.
Alternatively, the device further includes a Clark and Park conversion modules, and it is used for by Clark and Park
Contravarianter voltage sampled signal is changed commanders in change and inverter current sampled signal is transformed under dq coordinate systems, transformed inverse to obtain
Become device voltage sampling signal and transformed inverter current sampled signal.Power control loop includes power computation module and work(
Rate control module.The power computation module includes：Power calculator, it is used for according to transformed contravarianter voltage sampled signal
Instantaneous active power and instantaneous reactive power that inverter is exported are calculated with transformed inverter current sampled signal；First
Low pass filter, it is used to filter the high fdrequency component in instantaneous active power, to obtain average active power；And second low pass
Wave filter, it is used to filter the high fdrequency component in instantaneous reactive power, to obtain average reactive power.The power control module bag
Include：First subtracter, it is used to calculate the active power difference between target active power and average active power；Second subtraction
Device, it is used to calculate the reactive power difference between target reactive power and average reactive power；First proportional-integral-differential
(PID) controller, it is used to calculate phase adjusted amount Δ θ based on active power difference；And second PID controller, it is used for
Amplitude regulated quantity Δ E is calculated based on reactive power difference.
Alternatively, reference signal synthesizer specifically for：By amplitude regulated quantity Δ E and phase adjusted amount Δ θ respectively with width
Value EbaseAnd phase thetabaseIt is combined to generate inverter fundamental frequency reference signal ub * ase；And by inverter fundamental frequency reference signal
ub * aseIt is superimposed with N number of harmonic component generating contravarianter voltage reference signal.
Alternatively, reference signal synthesizer is based on following formula generation inverter fundamental frequency reference signal
Wherein,WithIt is respectively inverter fundamental frequency reference signalOn abc three-phases
Component.
Alternatively, the device further includes the second inverter sampler, its be used for inductive current to flowing through inductance or
The capacitance current for flowing through electric capacity is sampled, to obtain inductive current or capacitance current sampled signal, wherein inductance and capacitance group
Into the wave filter of inverter, wave filter is for filtering the high fdrequency component in the voltage that the three phase full bridge circuit of inverter is exported.
Inverter control loop includes：2nd Clark and Park conversion modules, it is used to become inverter of changing commanders by Clark and Park
Voltage sampling signal and inductive current or capacitance current sampled signal are transformed under dq coordinate systems, to obtain transformed inverter
Voltage sampling signal and transformed inductive current or capacitance current sampled signal；3rd Clark and Park conversion modules, its use
Transformed under dq coordinate systems in contravarianter voltage reference signal of changing commanders is become by Clark and Park, to obtain transformed inversion
Device voltage reference signal；Voltage subtraction device, it is used to calculate transformed contravarianter voltage reference signal and transformed inversion
Voltage difference between device voltage sampling signal；Proportional, integral-resonance mixing (PIR) controller, it is used for based on voltage difference
Calculating current ring reference signal；Current subtractor, it is used for calculating current ring reference signal with transformed inductive current or electricity
Current differential between capacitance current sampled signal；Current controller, it is used to calculate voltage modulation signal based on current differential；Instead
Park and anti-Clark conversion modules, it is used to becoming voltage modulation signal of changing commanders by anti-Park and anti-Clark and transforms to abc and sit
Under mark system, to obtain transformed voltage modulation signal；And modulator, it is used for transformed voltage modulation signal and load
Ripple signal is compared, and to obtain pulse-width signal, and the three phase full bridge electricity of inverter is driven using pulse-width signal
Device for power switching in road, so that output voltage is identical with contravarianter voltage reference signal.
Alternatively, proportional, integral-transmission function of the resonance mixture control under dq coordinate systems is：
Wherein, s is Laplace operator, ωbaseIt is the angular frequency of the fundamental component, kpvWith kivRespectively scale parameter
And integral parameter, krv_nWith ωnIt is resonant controller parameter, and n=6k, wherein k are positive integer.
According to another aspect of the present invention, there is provided a kind of voltage-source type combining inverter method for inhibiting harmonic current.The party
Method includes：Voltage on line side is sampled to obtain voltage on line side sampled signal；By N number of harmonic wave of voltage on line side sampled signal point
Amount is separated with fundamental component, and wherein N is greater than the integer equal to 1；Detect the amplitude and phase of fundamental component；To the defeated of inverter
Go out voltage and output current is sampled to obtain contravarianter voltage sampled signal and inverter current sampled signal；Based on inversion
Device voltage sampling signal, inverter current sampled signal, target active power and target reactive power calculate amplitude regulated quantity and
Phase adjusted amount；Based on the generation contravarianter voltage reference of amplitude, phase, amplitude regulated quantity, phase adjusted amount and N number of harmonic component
Signal；And control inverter is so that output voltage follows contravarianter voltage reference signal.
According to the technical scheme that the present invention is provided, the fundamental frequency of fundamental component and voltage on line side in the output voltage of inverter
The control of phase and the power controlled loop of difference in magnitude between component, therefore the fundamental frequency that can be specified to electrical grid transmission is active
And reactive current (power)；Meanwhile, the harmonic wave in the harmonic component and voltage on line side in the output voltage of inverter can be reduced
Error between component, therefore can effectively suppress voltage-source type combining inverter and contain to the harmonic current of electrical grid transmission
Amount, greatly reduces the complexity and design difficulty of grid-connected inverter system.
A series of concept of simplification is introduced in the content of the invention, these concepts will enter one in specific embodiment part
Step is described in detail.Present invention part be not meant to attempt the key feature for limiting technical scheme required for protection and
Essential features, the protection domain for attempting to determine technical scheme required for protection is not meant that more.
Below in conjunction with accompanying drawing, advantages and features of the invention are described in detail.
Brief description of the drawings
Drawings below of the invention is in this as a part of the invention for understanding the present invention.Shown in the drawings of this hair
Bright implementation method and its description, for explaining principle of the invention.In the accompanying drawings,
Fig. 1 a and 1b are respectively the one phase equivalent circuit figure and its vector relations figure of voltage-source type grid-connected inverter system；
Fig. 2 a and 2b are respectively the single-phase fundamental component equivalent circuit diagram and harmonic wave of voltage-source type grid-connected inverter system
Component equivalent circuit diagram；
Fig. 3 is the schematic of the voltage-source type combining inverter current harmonics elimination device according to one embodiment of the invention
Block diagram；
Fig. 4 is the schematic block diagram of the voltage-source type grid-connected inverter system according to one embodiment of the invention；
Fig. 5 is the amplitude versus frequency characte and phase-frequency characteristic figure of the trapper according to one embodiment of the invention；
Fig. 6 be according to one embodiment of the invention, the output voltage of voltage-source type combining inverter and output current from
Abc coordinates are tied to the conversion schematic diagram of dq coordinate systems；
Fig. 7 is the flow of the voltage-source type combining inverter method for inhibiting harmonic current according to one embodiment of the invention
Figure.
Specific embodiment
In the following description, there is provided substantial amounts of details is so as to thoroughly understand the present invention.However, this area skill
Art personnel will be seen that, described below to only relate to presently preferred embodiments of the present invention, and the present invention can be without one or more so
Details and be carried out.Additionally, in order to avoid obscuring with the present invention, for some technical characteristics well known in the art not
It is described.
Voltage-source type combining inverter according to embodiments of the present invention is described with reference to Fig. 1 a, Fig. 1 b, Fig. 2 a and Fig. 2 b
Current harmonics elimination principle.In the following description, " inverter ", " voltage-source type combining inverter " refer to identical object,
They can be interchangeably used.
Any one phase taken in the voltage-source type grid-connected inverter system with three-phase equilibrium power network parallel running is analyzed,
Its equivalent circuit diagram is can obtain, as shown in Figure 1a.V in figureinvIt is voltage-source type combining inverter output voltage vector, VgridFor
Voltage on line side vector, I is grid-connected current vector, Zline=sLline+RlineFor voltage-source type combining inverter output end with simultaneously
Substitutional connection impedance between site.According to circuit theory, can be represented with vector relations figure in Fig. 1 a between each vector
Relation, as shown in Figure 1 b.According to Fig. 1 b, active-power P and nothing of the voltage-source type combining inverter to electrical grid transmission can be obtained
The expression formula of work(power Q, is shown below：
In formula (1), Δ φ is vector VinvWith vectorial VgridPhase difference；Z and θ is substitutional connection impedance ZlineAmplitude
With phase.In the application scenario of voltage-source type combining inverter, line impedance is in mainly perception, i.e. θ=pi/2, and normal
Δ φ is very small in the course of work, i.e.,：Sin Δ φ ≈ Δs φ and cos Δ φ ≈ 1.Therefore, formula (1) can be reduced to formula
(2)：
From formula (2), by the voltage on line side at the output voltage and grid entry point of control voltage source type interconnected inverter
Between difference in magnitude (Vinv-Vgrid) with phase difference φ, inverter can be controlled to the active-power P of electrical grid transmission and idle
Power Q.When voltage on line side only exists fundamental component, it is possible to use phaselocked loop detects to the voltage on line side at grid entry point,
Obtain the instantaneous phase θ and amplitude E of voltage on line side.Then by the use of two proportional, integral (PI) controllers as power controller,
It is based respectively on active power reference value (i.e. target active power) P of inverter*With the active-power P of inverter reality output it
Between difference, and inverter reactive power reference qref (i.e. target reactive power) Q*With the idle work(of inverter reality output
Difference between rate Q carries out computing, so as to obtain the phase adjusted amount Δ θ and amplitude regulated quantity Δ E of the output voltage of inverter.
Finally, contravarianter voltage reference signal is synthesized using following formula (3), and using contravarianter voltage current inner loop to inverter
Output voltage is controlled, and it is followed contravarianter voltage reference signalSo that original of the inverter according to formula (2)
Reason, the active power and reactive power specified to electrical grid transmission.
When voltage on line side has angular frequency for ωharThree-phase equilibrium harmonic voltage disturb when, according to linear superposition theorem,
Can be ω by fundamental component equivalent circuit diagram and angular frequency that Fig. 1 a are decomposed into voltage-source type grid-connected inverter systemharIt is humorous
Wave component equivalent circuit diagram, respectively as shown in Fig. 2 a and Fig. 2 b.U in figureref_bGinv(jωbase) and uref_hGinv(jωhar) respectively
For the fundamental component and angular frequency of the output voltage of voltage-source type combining inverter are ωharHarmonic component；ugrid(jωbase)
With ugrid(jωhar) to be respectively the fundamental component of voltage on line side with angular frequency be ωharHarmonic component；Zline(jωbase) with
Zline(jωhar) to be respectively the fundamental component of substitutional connection impedance with angular frequency be ωharHarmonic component.I(jωbase) and I (j
ωhar) to be respectively the fundamental component of grid-connected current with angular frequency be ωharHarmonic component.
According to Fig. 2 a, the fundamental component width of any one phase grid-connected current in voltage-source type grid-connected inverter system is can obtain
Value expression, it is as follows：
According to Fig. 2 b, the harmonic component width of any one phase grid-connected current in voltage-source type grid-connected inverter system is can obtain
Value expression, it is as follows：
By formula (4) as can be seen that to ensure that voltage-source type is grid-connected inverse when there is harmonic voltage disturbance in voltage on line side
Becoming device can normally to electrical grid transmission fundamental frequency is active and reactive power is, it is necessary to based on formula (2), to voltage-source type parallel network reverse
The fundamental component of the output voltage of device carries out the droop control of P/ θ and Q/E.By formula (5) as can be seen that can be by reducing the formula
The mode of middle molecule absolute value, reduce the output of voltage-source type combining inverter with side harmonics voltage angular frequency identical harmonic wave
Electric current.
Assuming that there is angular frequency in voltage on line side for n ωbaseAnd peak value is bnThree-phase equilibrium harmonic voltage, the harmonic wave
The expression formula of voltage is as follows：
Formula (6) can be entered line translation by Clark the and Park transformation for mula shown in following formula (7) and formula (8)：
Thus the expression formula of the three-phase equilibrium harmonic voltage under dq coordinate systems is obtained, as shown in formula (9)：
As can be seen that the fundamental component of voltage on line side is mapped as the DC quantity on dq axles from formula (9).And all harmonic waves
Component is mapped as the trigonometric function signal on dq axles, and can not offset.According to former harmonic voltage signal positive sequence, negative phase-sequence not
Together, each harmonic component is mapped as the trigonometric function signal of different frequency on dq axles, wherein 1 time, 4 times, 7 times are humorous with 10 positive sequences
It is (n-1) ω that wave component is mapped as angular frequency on dq axlesbaseTrigonometric function signal；2 times, 5 times, 8 times humorous with 11 negative phase-sequences
It is (n+1) ω that wave component is mapped as angular frequency on dq axlesbaseTrigonometric function signal.
It should be noted that it is different according to side harmonics voltage angular frequency, can be in the electricity of voltage-source type combining inverter
Corresponding resonant controller in parallel, constitutes PIR controller, to improve inverter on pressure ring controller (proportional-plus-integral controller)
Control loop is further eliminated between inverter output end and grid entry point to the ability of tracking of net side three-phase equilibrium harmonic voltage
Harmonic voltage is poor, helps to realize reducing voltage-source type combining inverter to electricity by the molecule absolute value in reduction formula (5)
Net the harmonic current of transmission.
The present invention is further described with reference to Fig. 3-7.
According to an aspect of the present invention, there is provided a kind of voltage-source type combining inverter current harmonics elimination.Fig. 3 shows root
According to the schematic block diagram of the voltage-source type combining inverter current harmonics elimination device 300 of one embodiment of the invention.
Device 300 includes net side sampler 301, the first inverter sampler 302, voltage on line side processor 303, phaselocked loop
304th, power control loop 305, reference signal synthesizer 306 and inverter control loop 307.
Wherein, net side sampler 301 is used to that voltage on line side to be sampled to obtain voltage on line side sampled signal.First is inverse
Becoming device sampler 302 is used to that the output voltage and output current of inverter to be sampled to obtain contravarianter voltage sampled signal
With inverter current sampled signal.Voltage on line side processor 303 is used for N number of harmonic component and base of voltage on line side sampled signal
Frequency component is separated, and wherein N is greater than the integer equal to 1.Phaselocked loop 304 is used to detect the amplitude E of fundamental componentbaseAnd phase
θbase.Power control loop 305 is used to be based on contravarianter voltage sampled signal, inverter current sampled signal, target wattful power
Rate and target reactive power calculate amplitude regulated quantity Δ E and phase adjusted amount Δ θ.Reference signal synthesizer 306 is used to be based on width
Value Ebase, phase thetabase, amplitude regulated quantity Δ E, phase adjusted amount Δ θ and N number of harmonic component generation contravarianter voltage with reference to letter
Number.Inverter control loop 307 is used to control inverter so that output voltage follows contravarianter voltage reference signal.
In order to make it easy to understand, describing the present invention in detail with reference to Fig. 4.Fig. 4 is the electricity according to one embodiment of the invention
The schematic block diagram of potential source type grid-connected inverter system.In fig. 4 it is shown that power network, voltage-source type combining inverter and and its
Associated voltage-source type combining inverter current harmonics elimination device.It will appreciated by the skilled person that shown in Fig. 4
Only it is an example for realizing grid-connected inverter system of the invention wherein, for being expressly understood invention structure of the invention
Think, but it is not construed as limiting the invention.
In fig. 4 it is shown that voltage on line side processor 401, phaselocked loop 402, power control loop 403, reference signal are closed
Grow up to be a useful person 404 and inverter control loop 405, their voltage on line side processor 303, phaselocked loop 304, power controls respectively with Fig. 3
Loop processed 305, reference signal synthesizer 306 and inverter control loop 307 are corresponding.
In the embodiment shown in fig. 4, net side sampler (not shown) is sampled to obtain net side electricity to voltage on line side
Pressure sampled signal ugrid_abc.Voltage on line side processor 401 is by voltage on line side sampled signal ugrid_abcN number of harmonic component and base
Frequency component is separated, and wherein N is greater than the integer equal to 1.
Alternatively, voltage on line side processor 401 can include N groups trapper and subtracter.N groups trapper is used for one a pair
The N number of harmonic component of ground filtering is answered, to obtain fundamental component.The center resonance angular frequency of each trapper in every group of trapper and
The angular frequency of harmonic component corresponding with this group of trapper is identical.Subtracter is used for from voltage on line side sampled signal ugrid_abcIn subtract
Fundamental component is removed, to obtain N number of harmonic component.
Fig. 4 schematically illustrates using one group of trapper and subtracter to separate net side voltage sampling signal ugrid_abc
Fundamental component and angular frequency be ωharHarmonic component situation.As shown in figure 4, voltage on line side processor 401 can also be wrapped
Demultiplexer (DEMUX) is included, for by voltage on line side sampled signal ugrid_abcIt is separated on abc three-phases, obtains ugrid_a、
ugrid_bAnd ugrid_c, then each of which is independently taken in.In this case, one group of trapper is identical including three
, center resonance angular frequencyo=ωharTrapper Gnotch(s).Center resonance angular frequency is ωoTrapper transmission letter
Number is as shown in formula (10)：
Trapper can be changed in center resonance angular frequency with n values by changing the k in formula (10)oNearby signal is declined
Subtract band width and depth.For example, as k=10 andWhen, center resonant frequency is the width of the trapper of 550Hz
Frequency characteristic and phase-frequency characteristic are as shown in Figure 5.
Trapper GnotchS angular frequency can be ω by ()harHarmonic component filter, therefore, in the defeated of above three trapper
Go out end and respectively obtain value u of the fundamental component on abc three-phasesbase_a、ubase_bAnd ubase_c.As shown in figure 4, voltage on line side is processed
Device 401 can also include the multiplexer (MUX) being connected with trapper, and it can be by ubase_a、ubase_bAnd ubase_cSynthesize
Fundamental component ubase_abc.Subtracter can be by ugrid_a、ugrid_b、ugrid_cRespectively with ubase_a、ubase_bAnd ubase_cSubtract each other, in terms of
Calculation angular frequency is ωharValue u of the harmonic component on abc three-phasesharmonic_a、uharmonic_bAnd uharmonic_c.At voltage on line side
Reason device 401 can also include the multiplexer being connected with subtracter, and it can be by uharmonic_a、uharmonic_bAnd uharmonic_c
Synthesize harmonic component uharmonic_abc。
By voltage on line side sampled signal ugrid_abcIn the fundamental component harmony separate process of wave component can pass through under
The formula (11) in face is expressed：
Alternatively, the trapper series connection of the harmonic component for filtering same phase voltage on line side in above-mentioned N groups trapper connects
Connect.When the harmonic voltage that there are multiple Frequency points in voltage on line side is disturbed, different center resonance angular frequencies are possessed using multigroup
Trapper series connection structure, the harmonic voltage of each Frequency point can one by one be filtered, and by the structure shown in formula (12)
By voltage on line side sampled signal ugrid_abcIn fundamental component separated with harmonic component.
Alternatively, said apparatus may further include compensator (not shown).The compensator is used to be based on fundamental component
Angular frequency and N group trappers in the transmission function of each trapper calculate fundamental component is made for compensating N group trappers
Into influence amplitude compensation amount EoffSet and phase compensation amount θ offset.The compensator is further used for being based respectively on amplitude benefit
The amount of repaying EoffsetWith phase compensation amount θ offsetTo amplitude EbaseAnd phase thetabaseCompensate.It is understood that when using upper
When stating trapper, trapper GnotchS () not only can be by voltage on line side sampled signal ugrid_abcAngular frequency be ωharHarmonic wave point
Amount is filtered, also can be to voltage on line side sampled signal ugrid_abcFundamental component produce influence.The influence is embodied in works as voltage-source type
, it is necessary to detect the fundamental component of voltage on line side sampled signal before the grid-connected switch closure of grid-connected inverter system, and by inverter
The fundamental component of output voltage and voltage on line side sampled signal when synchronizing.The influence caused to fundamental frequency signal to trapper
The error that can reduce and be produced in above-mentioned synchronizing process is compensated, therefore the impact of grid-connected switch closure moment can be avoided
Electric current is excessive, and then avoids damaging inverter.
Above-mentioned compensator calculates amplitude compensation amount EoffsetWith phase compensation amount θ offsetProcess it is as follows.
First, by s=j ωbaseBring trapper transmission function G intonotch(s), it is as follows：
ω in formulabaseIt is the angular frequency of the fundamental component of voltage on line side sampled signal.Then formula (13) is converted into plural number
Mould and multiple angle form, and carry out abbreviation, can obtain：
Gnotch(jωbase)=| gnotch|∠θnotch (14)
In formula (14),
Therefore, the phase compensation amount θ o of fundamental component be can obtainffsetAnd amplitude compensation amount Eoffset：
When being connected using multigroup trapper, the phase compensation amount θ o of fundamental componentffsetAnd amplitude compensation amount EoffsetSuch as
Shown in following formula：
As the amplitude compensation amount E for calculating fundamental componentoffsetWith phase compensation amount θoffset, it is possible to use compensator is to base
The amplitude and phase of frequency component are compensated.As described below, the amplitude and phase of fundamental component can be examined using phaselocked loop 402
Survey.
Phaselocked loop 402 is used to detect the amplitude E of fundamental componentbaseAnd phase thetabase.Using phaselocked loop 402 to voltage on line side
The fundamental component u that processor 401 is exportedbase_abcComputing is carried out, to obtain fundamental component ubase_abcPhase thetabaseWith amplitude
Ebase.Computing is carried out by following formula (17), can obtain being not affected by the fundamental component u of trapper influencebase_abcPhase
θbaseWith amplitude EbaseValue：
In formula (17), θ 'baseWith E 'baseCompensated phase theta is represented respectivelybaseWith compensated amplitude Ebase.Although
For convenience, having used different symbols in formula (17) represents the phase and amplitude before and after compensation, but can be
Understand, in the embodiment for performing compensation, θ 'baseWith E 'baseAs it is input to the phase of follow-up reference signal synthesizer 404
θbaseWith amplitude Ebase。
With continued reference to Fig. 4, the first inverter sampler is sampled to obtain to the output voltage and output current of inverter
Obtain contravarianter voltage sampled signal uCabcWith inverter current sampled signal iOabc.Power control loop 403 is based on contravarianter voltage
Sampled signal uCabc, inverter current sampled signal iOabc, target active-power P*With target reactive power Q*Calculate amplitude regulation
Amount Δ E and phase adjusted amount Δ θ.
Alternatively, said apparatus may further include a Clark and Park conversion modules 406, and it is used for by such as
Clark and Park shown in formula (7) and formula (8) become the contravarianter voltage sampled signal u that changes commandersCabcWith inverter current sampled signal
iOabcTransform under dq coordinate systems, to obtain transformed contravarianter voltage sampled signal uCdqWith transformed inverter current
Sampled signal iOdq, as shown in Figure 6.
Power control loop 403 can include power computation module 4031 and power control module 4032.Power calculation mould
Block 4031 can include power calculator, for according to transformed contravarianter voltage sampled signal uCdqWith transformed inversion
Device current sampling signal iOdqCalculate instantaneous active power P and instantaneous reactive power Q that inverter is exported.In this power calculation
In link, using instantaneous power theorem, voltage-source type combining inverter is calculated to the instantaneous active power P of electrical grid transmission and wink
When reactive power Q, be shown below：
Power computation module 4031 can also include the first low pass filter GLPF(s) and the second low pass filter GLPF(s),
It is respectively used to filter the high fdrequency component in instantaneous active power P and instantaneous reactive power Q, to obtain average active power p and put down
Equal reactive power q, formula is as follows：
Power control module 4032 can include the first subtracter, the second subtracter, the first proportional-integral-differential (PID)
Controller and the second PID controller.First subtracter is used to calculate target active-power P*Having between average active power p
Work(power difference, the first PID controller is used to calculate phase adjusted amount Δ θ, the phase adjusted amount based on the active power difference
Δ θ is directed to the phase adjusted amount of the output voltage of inverter.Similarly, the second subtracter is used to calculate target reactive power Q*With
Reactive power difference between average reactive power q.Second PID controller is used to calculate amplitude tune based on the reactive power difference
Section amount Δ E, amplitude regulated quantity Δ E is directed to the amplitude regulated quantity of the output voltage of inverter.Above-mentioned calculating process such as formula
(20) shown in：
In formula (20), kpp、kpi、kpdRespectively the ratio of the first PID controller, integration and differential parameter；kqp、kqi、kqd
Respectively the ratio of the second PID controller, integration and differential parameter.
With continued reference to Fig. 4, reference signal synthesizer 404 is used to be based on amplitude Ebase, phase thetabase, amplitude regulated quantity Δ E,
Phase adjusted amount Δ θ and N number of harmonic component generation contravarianter voltage reference signal
Alternatively, reference signal synthesizer 404 can be exported power control loop 403 amplitude regulated quantity Δ E and
Phase adjusted amount Δ θ is exported with the phaselocked loop 402 respectively or amplitude E through overcompensationbaseAnd phase thetabaseIt is combined with life
Into inverter fundamental frequency reference signalThe calculating is as shown in the trigonometric function relation of formula (21)：
As shown in figure 4, reference signal synthesizer 404 can include adder and reference signal generator, this can be used
Both realize above-mentioned generation inverter fundamental frequency reference signalCalculating process.In fig. 4, reference signal generator institute
The inverter fundamental frequency reference signal of outputIt is its component on abc three-phasesWith
Reference signal synthesizer 404 can be further used for inverter fundamental frequency reference signalWith N number of harmonic component
It is superimposed generating contravarianter voltage reference signalAs shown in figure 4, reference signal synthesizer 404 may further include
Demultiplexer, adder and multiplexer.Demultiplexer by voltage on line side processor 401 or compensator exported it is humorous
Wave component uharmonic_abcDecompose on abc three-phases, obtain uharmonic_a、uharmonic_bAnd uharmonic_c.Adder will be in reference
What the output of signal generator was obtainedWithRespectively with uharmonic_a、uharmonic_bWith
uharmonic_cIt is superimposed, as shown in formula (22), the contravarianter voltage of complete three-phase is produced by multiplexer afterwards with reference to letter
Number
Alternatively, said apparatus may further include the second inverter sampler (not shown), for flowing through inductance
411 inductive current flows through the capacitance current of electric capacity 412 and is sampled, to obtain inductive current sampled signal iLabcOr electric capacity
Current sampling signal iCabc, wherein inductance 411 and electric capacity 412 constitutes the wave filter of inverter 410, and the wave filter is used to filter inverse
High fdrequency component in the voltage that the three phase full bridge circuit 413 of change device 410 is exported.
Inverter control loop 405 can include the 2nd Clark and Park conversion modules 4051, the 3rd Clark and Park
It is conversion module 4052, voltage subtraction device 4053, PIR controller 4054, current subtractor 4055, current controller 4056, anti-
Park and anti-Clark conversion modules 4057 and modulator 4058.
2nd Clark and Park conversion modules 4051 are used to become contravarianter voltage sampling letter of changing commanders by Clark and Park
Number uCabcWith inductive current sampled signal iLabcOr capacitance current sampled signal iCabcTransform under dq coordinate systems, to obtain through becoming
The contravarianter voltage sampled signal u for changingCdqWith transformed inductive current sampled signal iLdqOr capacitance current sampled signal iCdq。
3rd Clark and Park conversion modules 4052 are used to become contravarianter voltage reference signal of changing commanders by Clark and ParkBecome
Change under dq coordinate systems, to obtain transformed contravarianter voltage reference signal
Voltage subtraction device 4053 is used to calculate transformed contravarianter voltage reference signalWith transformed inverter electricity
Pressure sampled signal uCdqBetween voltage difference edq.PIR controller 4054 is used to be based on voltage difference edqCalculating current ring is joined
Examine signalIn fig. 4, square 4054 shows the inside structure of PIR controller 4054.PIR controller is under dq coordinate systems
Transmission function such as formula (23) shown in：
In formula (23), s is Laplace operator, ωbaseIt is the angular frequency of above-mentioned fundamental component, kpvWith kivRespectively ratio
Parameter and integral parameter, krv_nWith ωnIt is resonant controller parameter, and n=6k, wherein k are positive integer, i.e. n=6,12,
18…
Proportional integral link in formula (23) can be such that inverter control loop 405 realizes under dq coordinate systems to DC component
Stable state indifference control, i.e.,：Realize that diagonal frequencies are ω under abc coordinate systemsbaseFundamental component stable state indifference control；And
Resonance link can make inverter control loop realize that diagonal frequencies are n ω under dq coordinate systemsbaseTrigonometric function signal it is steady
State indifference is controlled, that is, realize that diagonal frequencies are (n+1) ω under abc coordinate systemsbaseThree-phase equilibrium positive sequence harmonic component of voltage
Or angular frequency is (n-1) ωbaseThree-phase equilibrium Negative sequence harmonic component of voltage stable state no error following.
Current subtractor 4055 is used for calculating current ring reference signalWith transformed inductive current sampled signal iLdqOr
Capacitance current sampled signal iCdqBetween current differential.Current controller 4056 is used to calculate voltage tune based on the current differential
Signal u processeddq.Anti- Park and anti-Clark conversion modules 4057 are used to become voltage modulation signal of changing commanders by anti-Park and anti-Clark
udqTransform under abc coordinate systems, to obtain transformed voltage modulation signal uabc.Anti- Park and anti-Clark transformation for mula such as formula
(24) and shown in formula (25)：
By after the computing of anti-Park and anti-Clark conversion modules 4057, obtaining the inverter 410 under abc coordinate systems
Three phase full bridge circuit 413 needed for modulated signal uabc.Afterwards, by transformed modulated signal uabcIt is input to modulator 4058
In.Modulator 4058 is used for transformed voltage modulation signal uabcIt is compared with carrier signal, to obtain pulsewidth modulation
(PWM) signal, and the device for power switching in the three phase full bridge circuit 413 of inverter 410 is driven using pwm signal, so that
Output voltage uCabcWith contravarianter voltage reference signalIt is identical, that is to say, that to be obtained on electric capacity 412 and contravarianter voltage
Reference signalIdentical output voltage uCabc。
It is evidenced from the above discussion that, fundamental component in the output voltage of inverter and deposited between the fundamental component of voltage on line side
In phase and difference in magnitude.According to the present invention provide voltage-source type combining inverter current harmonics elimination device, inverter it is defeated
The control of phase and the power controlled loop of difference in magnitude between the fundamental component and the fundamental component of voltage on line side that go out in voltage
System, therefore can be according to the relative theory described in formula (2) to the fundamental frequency that electrical grid transmission is specified is active and reactive current (power)；Together
When, can be reduced between the harmonic component in harmonic component and voltage on line side in the output voltage of inverter using said apparatus
Error, the relative theory according to formula (5) can effectively suppress voltage-source type combining inverter to the humorous of electrical grid transmission
The content of ripple electric current, greatly reduces the complexity and design difficulty of grid-connected inverter system.
According to another aspect of the present invention, there is provided a kind of voltage-source type combining inverter method for inhibiting harmonic current.Fig. 7 shows
Go out the flow chart of voltage-source type combining inverter method for inhibiting harmonic current 700 according to an embodiment of the invention.Method 700
Comprise the following steps.
In step S701, voltage on line side is sampled to obtain voltage on line side sampled signal.
In step S702, N number of harmonic component of voltage on line side sampled signal is separated with fundamental component, wherein N is greater than
Integer equal to 1.
In step S703, the amplitude and phase of fundamental component are detected.
In step S704, output voltage and output current to inverter are sampled to obtain contravarianter voltage sampling letter
Number and inverter current sampled signal.
In step S705, based on contravarianter voltage sampled signal, inverter current sampled signal, target active power and mesh
Mark reactive power calculates amplitude regulated quantity and phase adjusted amount.
In step S706, inverter is generated based on amplitude, phase, amplitude regulated quantity, phase adjusted amount and N number of harmonic component
Voltage reference signal.
In step S707, control inverter is so that output voltage follows contravarianter voltage reference signal.
Description more than by reading to voltage-source type combining inverter current harmonics elimination device, ordinary skill
The step of personnel are appreciated that voltage-source type combining inverter method for inhibiting harmonic current, feature and its advantage, no longer go to live in the household of one's in-laws on getting married herein
State.
The present invention is illustrated by above-described embodiment, but it is to be understood that, above-described embodiment is only intended to
Citing and descriptive purpose, and be not intended to limit the invention in described scope of embodiments.In addition people in the art
Member is it is understood that the invention is not limited in above-described embodiment, teaching of the invention can also be made more kinds of
Variants and modifications, these variants and modifications are all fallen within scope of the present invention.Protection scope of the present invention by
The appended claims and its equivalent scope are defined.
Claims (10)
1. a kind of voltage-source type combining inverter current harmonics elimination device, including：
Net side sampler, it is used to sample voltage on line side to obtain voltage on line side sampled signal；
First inverter sampler, it is used to sample the output voltage and output current of inverter to obtain inverter electricity
Pressure sampled signal and inverter current sampled signal；
Voltage on line side processor, it is used to separate N number of harmonic component of the voltage on line side sampled signal with fundamental component, its
Middle N is greater than the integer equal to 1；
Phaselocked loop, its amplitude E for being used to detect the fundamental componentbaseAnd phase thetabase；
Power control loop, it is used for based on the contravarianter voltage sampled signal, the inverter current sampled signal, target
Active power and target reactive power calculate amplitude regulated quantity Δ E and phase adjusted amount Δ θ；
Reference signal synthesizer, it is used for based on the amplitude Ebase, the phase thetabase, it is the amplitude regulated quantity Δ E, described
Phase adjusted amount Δ θ and N number of harmonic component generation contravarianter voltage reference signal；And
Inverter control loop, it is used to control the inverter so that the output voltage follows the contravarianter voltage to refer to
Signal.
2. device as claimed in claim 1, it is characterised in that the voltage on line side processor includes：
N group trappers, it is used to filter N number of harmonic component correspondingly, to obtain the fundamental component, wherein every group
The angular frequency of the center resonance angular frequency of each trapper in trapper and harmonic component corresponding with this group of trapper is identical；
And
Subtracter, it is used to subtract the fundamental component from the voltage on line side sampled signal, to obtain N number of harmonic wave point
Amount.
3. device as claimed in claim 2, it is characterised in that described device further includes compensator, the compensator is used
The transmission function of each trapper in the angular frequency based on the fundamental component and the N groups trapper is calculated for compensating
The amplitude compensation amount E of the influence that the N groups trapper is caused to the fundamental componentoffsetWith phase compensation amount θoffset, and
It is further used for being based respectively on the amplitude compensation amount EoffsetWith the phase compensation amount θoffsetTo the amplitude EbaseAnd institute
State phase thetabaseCompensate.
4. device as claimed in claim 2, it is characterised in that in the N groups trapper for filtering same phase voltage on line side
The trapper of harmonic component be connected in series.
5. device as claimed in claim 1, it is characterised in that
Described device further includes a Clark and Park conversion modules, its be used to become by Clark and Park change commanders it is described
Contravarianter voltage sampled signal and the inverter current sampled signal are transformed under dq coordinate systems, to obtain transformed inversion
Device voltage sampling signal and transformed inverter current sampled signal；
The power control loop includes：
Power computation module, it includes：
Power calculator, it is used for according to the transformed contravarianter voltage sampled signal and the transformed inverter electricity
Stream sampled signal calculates instantaneous active power and instantaneous reactive power that the inverter is exported；
First low pass filter, it is used to filter the high fdrequency component in the instantaneous active power, to obtain average active power；
And
Second low pass filter, it is used to filter the high fdrequency component in the instantaneous reactive power, to obtain average reactive power；
And
Power control module, it includes：
First subtracter, the active power that it is used to calculate between the target active power and the average active power is poor
Value；
Second subtracter, the reactive power that it is used to calculate between the target reactive power and the average reactive power is poor
Value；
First proportional-integral derivative controller, it is used to calculate the phase adjusted amount Δ θ based on the active power difference；
And
Second proportional-integral derivative controller, it is used to calculate the amplitude regulated quantity Δ E based on the reactive power difference.
6. device as claimed in claim 1, it is characterised in that the reference signal synthesizer specifically for：
By the amplitude regulated quantity Δ E and the phase adjusted amount Δ θ respectively with the amplitude EbaseWith the phase thetabaseXiang Jie
Close to generate inverter fundamental frequency reference signalAnd
By the inverter fundamental frequency reference signalIt is superimposed with N number of harmonic component to be believed with generating contravarianter voltage reference
Number.
7. device as claimed in claim 6, it is characterised in that the reference signal synthesizer is based on following formula generation institute
State inverter fundamental frequency reference signal
Wherein,WithIt is respectively the inverter fundamental frequency reference signalOn abc three-phases
Component.
8. device as claimed in claim 1, it is characterised in that
Described device further includes the second inverter sampler, and it is used for the inductive current to flowing through inductance or flows through electric capacity
Capacitance current is sampled, to obtain inductive current or capacitance current sampled signal, wherein the inductance and electric capacity composition
The wave filter of the inverter, the wave filter is used to filtering in the voltage that the three phase full bridge circuit of the inverter is exported
High fdrequency component；
The inverter control loop includes：
2nd Clark and Park conversion modules, it is used to become the contravarianter voltage sampled signal of changing commanders by Clark and Park
Transformed under dq coordinate systems with the inductive current or capacitance current sampled signal, sampled with obtaining transformed contravarianter voltage
Signal and transformed inductive current or capacitance current sampled signal；
3rd Clark and Park conversion modules, it is used to become the contravarianter voltage reference signal of changing commanders by Clark and Park
Transform under dq coordinate systems, to obtain transformed contravarianter voltage reference signal；
Voltage subtraction device, it is used to calculate the transformed contravarianter voltage reference signal and the transformed inverter electricity
Voltage difference between pressure sampled signal；
Proportional, integral-resonance mixture control, it is used for based on the voltage difference calculating current ring reference signal；
Current subtractor, it is used to calculating the electric current loop reference signal adopts with the transformed inductive current or capacitance current
Current differential between sample signal；
Current controller, it is used to calculate voltage modulation signal based on the current differential；
Anti- Park and anti-Clark conversion modules, it is used to become the voltage modulation signal change of changing commanders by anti-Park and anti-Clark
Change under abc coordinate systems, to obtain transformed voltage modulation signal；And
Modulator, it is used to be compared the transformed voltage modulation signal with carrier signal, to obtain pulsewidth modulation
Signal, and the device for power switching in the three phase full bridge circuit of the inverter is driven using the pulse-width signal, with
Make the output voltage identical with the contravarianter voltage reference signal.
9. device as claimed in claim 8, it is characterised in that the proportional, integral-resonance mixture control is in dq coordinate systems
Under transmission function be：
Wherein, s is Laplace operator, ωbaseIt is the angular frequency of the fundamental component, kpvWith kivRespectively scale parameter and product
Divide parameter, krv_nWith ωnIt is resonant controller parameter, and n=6k, wherein k are positive integer.
10. a kind of voltage-source type combining inverter method for inhibiting harmonic current, including：
Voltage on line side is sampled to obtain voltage on line side sampled signal；
N number of harmonic component of the voltage on line side sampled signal is separated with fundamental component, wherein N is greater than the integer equal to 1；
Detect the amplitude and phase of the fundamental component；
Output voltage and output current to inverter are sampled to obtain contravarianter voltage sampled signal and inverter current
Sampled signal；
It is idle based on the contravarianter voltage sampled signal, the inverter current sampled signal, target active power and target
Power calculation amplitude regulated quantity and phase adjusted amount；
Based on the amplitude, the phase, the amplitude regulated quantity, the phase adjusted amount and N number of harmonic component generation
Contravarianter voltage reference signal；And
Control inverter is so that the output voltage follows the contravarianter voltage reference signal.
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| CN105471120B (en) * | 2016-01-11 | 2018-05-18 | 西南交通大学 | The current constant control and circulation inhibition method of the inductive electric energy transmission system of multi-inverter parallel |
| CN105634150B (en) * | 2016-03-14 | 2018-05-18 | 西南交通大学 | The reactive power of inductive electric energy transmission system inhibits and constant pressure control method |
| CN106771879B (en) * | 2017-01-18 | 2020-08-28 | 阳光电源股份有限公司 | Power grid state detection method and device and static transfer switch cabinet |
| CN107196302A (en) * | 2017-07-19 | 2017-09-22 | 南方电网科学研究院有限责任公司 | A kind of MMC current harmonics elimination control method, system and controller |
| CN108448583A (en) * | 2018-05-02 | 2018-08-24 | 燕山大学 | A kind of modified adjuster applied to light current gird-connected inverter off the net |
| CN109104111A (en) * | 2018-10-29 | 2018-12-28 | 广东电网有限责任公司 | A kind of modularization multi-level converter control method, device and equipment |
| CN110336279B (en) * | 2019-07-17 | 2020-11-20 | 国网湖南省电力有限公司 | Electric power system oscillation self-adaptive suppression method, system and medium based on grid-connected converter |
| CN112964981B (en) * | 2021-02-05 | 2023-01-24 | 苏州海鹏科技有限公司 | Three-phase photovoltaic inverter relay fault detection method |
| CN113612403B (en) * | 2021-07-22 | 2023-02-28 | 漳州科华技术有限责任公司 | Multiphase rectification/inversion topology and single-phase control method, system and device thereof |
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