CN107896071A - A kind of three phase combined inverter based on neutral net - Google Patents

A kind of three phase combined inverter based on neutral net Download PDF

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Publication number
CN107896071A
CN107896071A CN201711191569.0A CN201711191569A CN107896071A CN 107896071 A CN107896071 A CN 107896071A CN 201711191569 A CN201711191569 A CN 201711191569A CN 107896071 A CN107896071 A CN 107896071A
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phase
mrow
msub
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inverter
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高晗璎
林勺博
杨富志
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Harbin University of Science and Technology
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Harbin University of Science and Technology
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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
    • H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

A kind of three phase combined inverter based on neutral net, including：The DC filtering circuit of processing is filtered to DC voltage, the bridge-type high frequency modulated circuit of ABC three-phase independences, the ac filter circuit of ABC three-phase independences, the sensor group and isolated form three-phase transformer of three-phase output voltage and output current, and each independent three-phase control circuit are gathered respectively.Include per phase control circuit：AD samplings, composite controller, PWM are calculated, bridge type three-phase anti-unbalance inverter.What the present invention can realize three-phase alternating current is completely independent control, remains to maintain three-phase voltage balance under extreme unbalanced load, improves the dynamic responding speed under inverter output AC voltage Stability quality and heavy load switching.

Description

A kind of three phase combined inverter based on neutral net
Technical field
The present invention relates to DC-AC electricity conversion field, more particularly to a kind of three phase combined inversion based on neutral net Power supply.
Background technology
Direct current system can be transformed to alternating current system by inverter, there is provided have the various exchange electricity consumptions of better quality.With The raising of social industrial requirement, to inverter power demand more and more higher, and large power inverter power source is opened due to what is used Close device performance limitation, its switching frequency is limited, control performance can by severely restricts, but on the other hand, with industry Load diversity increase, in independent AC network load switching become more frequently, it is stability to inverter output voltage, each Capability of fast response under kind heavy load switching, the electric voltage equalization degree under severe unbalanced load, the protection energy to short trouble Power etc. etc. proposes very high requirement.
The problem of load harmonic complicated component and degree of unbalancedness are higher be present in isolated island exchange micro-capacitance sensor, due to not with main electricity Net is connected, and load characteristic is had a great influence to the output voltage for exchanging micro- source, and microgrid oscillation is caused when serious, causes between micro- source Power distribution is uneven.Therefore exchange microgrid inverter need to consider expire under the load behavior of complexity compared to combining inverter The waveform quality of sufficient output voltage simultaneously ensures stability.Three-phase full-bridge inverter is compared to traditional three-phase semibridge system inversion Device, its because with voltage utilization is high, three-phase can independent control anti-unbalance power it is strong the advantages of, forming high-power microgrid exchange There is more application under the occasion of power supply.Full-bridge inverter can be at utmost played using three single-phase inverter separate control solutions Advantage.Inverter uses traditional PID control, but direct current biasing be present and the problem of fundamental wave static difference is larger be present.Inverter list Member employs quasi resonant control, and the gain of increase fundamental wave reduces steady-state error, but lacks the control of reply Nonlinear Integer current load Strategy.Inverter employs the control program based on Repetitive controller-PI, has certain nonlinear load rejection ability, but PI It is superior that controller is not so good as resonant controller to the regulation performance of fundamental wave.
The content of the invention
To solve the above problems, the present invention proposes a kind of three phase combined inverter based on neutral net, realize Three-phase alternating current is completely independent control, remains to maintain three-phase voltage balance under extreme unbalanced load.
First, the present invention proposes a kind of three phase combined inverter based on neutral net, including：Direct current is pressed into The DC filtering circuit of row filtering process, the bridge-type high frequency modulated circuit of ABC three-phase independences, the ac filter of ABC three-phase independences Circuit, the sensor group and isolated form three-phase transformer of three-phase output voltage and output current are gathered respectively, and each solely Vertical three-phase control circuit；
It is described to include per phase control circuit：AD samplings, composite controller, PWM are calculated, bridge type three-phase anti-unbalance inversion electricity Source, the bridge type three-phase anti-unbalance inverter form phase by three groups of single-phase power pipe inversion full-bridges and three single-phase transformers Mutually independent output loop, per phase loop by the phase inversion full-bridge and the phase-change pressure being independently arranged in the full-bridge output loop Device primary side winding is formed.
In the described three phase combined inverter based on neutral net, the composite controller includes：Controller and Neural network parameter adjuster, the controller include quasi- PR controls calculator, Repetitive controller calculator.
In the described three phase combined inverter based on neutral net, the three-phase output of the three-phase control circuit is logical Cross grid-connected switch to be connected with exchange microgrid, exchange microgrid and power source is formed by inverter or generator, at the same it is linear load, non-thread Property load powered with unbalanced load by exchanging microgrid.
In the described three phase combined inverter based on neutral net, described quasi- PR control calculator specifically, Consider that quasi- PR during phase compensation controls the frequency domain transfer function form of calculator to be：
Wherein the molecule of resonant controller is in zero point ωNPlace's compensation phase, wherein φ is desired compensation at resonant frequency Phase value.
In the described three phase combined inverter based on neutral net, described Repetitive controller calculator is specially：
Error Cycle by Cycle integration can be expressed as difference equation as shown in formula：
U (k)=E (k)+QU (k-N), Q is error intergal parameter；
krzkC (z) forms gain and the penalty function of Repetitive controller, and c (z) to the transmission function of controlled device by carrying out Amplitude versus frequency characte compensates；Z is used in Repetitive controllerkAct on through path；krGain is adjusted for the forward direction of Repetitive controller；To repeating Controlling unit penalty function c (z) design, it can be carried out according to the resonance characteristic of LC wave filters in controlled device zero load transmission function Compensation, LC filter transfer functions such as formula：
L is filter inductance in formula, and C is filter resistor, and R is wave filter equivalent damping, and it has resonant frequency
In the described three phase combined inverter based on neutral net, the neural network parameter adjuster is specially BP calculators；
The output of each neuron of the output layer of neural network all the way of the neural network parameter adjuster corresponds to standard respectively PR controls 3 parameter K of calculatorP、Kr、ωc, the output of each neuron of another way neural network output layer corresponds to respectively to be weighed 3 parameter K of calculator are controlled againP、Qf、ωp；According to current inverter output voltage VoWith reference voltage VrefError, adjust Weight coefficient ω between whole each layer neuronijAnd ωjl, make parameter value of the neural network module output suitable for current state, and Parameter after neural network module is adjusted passes to quasi- PR control calculators and Repetitive controller calculator.
In the described three phase combined inverter based on neutral net, the vice-side winding of three single-phase transformers Connected for Y types.
The invention aims to overcome three phase inverter it is alternate intercouple, steady-state characteristic and dynamic characteristic are difficult to The problem of taking into account.The three-phase voltage degree of balance under extreme unbalanced load is improved, improves inverter output AC voltage stable state product Dynamic responding speed under matter and heavy load switching.The present invention three phase combined inverter using quasi- ratio resonance (PR)- The composite controller of Repetitive controller.The present invention compares existing inverter, and realize three-phase alternating current is completely independent control, Remain to maintain three-phase voltage balance under extreme unbalanced load, in time in the case of a scarce phase or two-phase, make an exception two-phase or One phase can be exported normally, and its stable state percent harmonic distortion is low, rapid dynamic response speed under the conditions of load changing.The present invention realizes Control to the laod unbalance of three phase inverter.
Brief description of the drawings
, below will be to embodiment or prior art in order to illustrate more clearly of technical scheme of the invention or of the prior art The required accompanying drawing used is briefly described in description, it should be apparent that, drawings in the following description are only in the present invention Some embodiments recorded, for those of ordinary skill in the art, on the premise of not paying creative work, can be with Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a kind of three phase combined inverter structural representation based on neutral net of the embodiment of the present invention；
Fig. 2 is three-phase control circuit structural representation of the present invention；
Fig. 3 is bridge type three-phase anti-unbalance inverter topology figure of the present invention；
Fig. 4 is composite controller structural representation in the embodiment of the present invention；
Fig. 5 is the controller Bode figures after zero point phase anticipatory control at resonant frequency of the present invention；
Fig. 6 is that PR- of the present invention repeats composite controller structured flowchart；
Fig. 7 is BP neural network structure chart of the present invention；
Fig. 8 is the voltage of the present invention, current detection circuit；
Fig. 9 is the current foldback circuit of the present invention；
Figure 10 is the drive circuit of the present invention；
Figure 11 is three-phase voltage waveform of the embodiment of the present invention in exchange microgrid inverter under linear loading condition；
Figure 12 is the three-phase voltage ripple that the embodiment of the present invention exports in exchange microgrid inverter in the case of nonlinear load Shape；
Figure 13 is FFT waveform of the embodiment of the present invention in exchange microgrid inverter in the case of nonlinear load；
Figure 14 is three-phase voltage waveform of the embodiment of the present invention in exchange microgrid inverter in the case of unbalanced load.
Embodiment
In order that those skilled in the art more fully understand the technical scheme in the embodiment of the present invention, and make the present invention's Above-mentioned purpose, feature and advantage can be more obvious understandable, technical scheme in the present invention made below in conjunction with the accompanying drawings further detailed Thin explanation.
A kind of three phase combined inverter based on neutral net, as shown in figure 1, including：DC voltage is filtered The DC filtering circuit 101 of ripple processing, the bridge-type high frequency modulated circuit 102 of ABC three-phase independences, the exchange filter of ABC three-phase independences Wave circuit 103, the sensor group 104 and isolated form three-phase transformer 105 of three-phase output voltage and output current are gathered respectively, And respective independent three-phase control circuit 106；
It is described per phase control circuit as shown in Fig. 2 including：AD samplings 201, composite controller 202, PWM calculate 203, bridge Type three-phase anti-unbalance inverter 204, the bridge type three-phase anti-unbalance inverter is as shown in figure 3, by three groups of single-phase power pipes Inversion full-bridge and three single-phase transformers form separate output loop, are set per phase loop by the phase inversion full-bridge and independently The phase transformer primary side winding put in the full-bridge output loop is formed；Three transformers T1, T2, T3 vice-side winding is Y-shaped connects.With the voltage on the electric capacity of Hall voltage collection outlet side, sampled, handled by AD, give quasi- PR controls Device, while repetitive controller is given again, the output result of the two controllers is added, PWM functions is given afterwards, calculates drive Dynamic signal.
In the described three phase combined inverter based on neutral net, the composite controller structural representation is as schemed Shown in 4, including：Controller and neural network parameter adjuster 403, the controller include quasi- PR controls calculator 401, repeated Control calculator 402.Using the open-loop gain based on phase lead compensation quasi resonant control precision improvement fundamental voltage and decline Subtract direct current biasing.The harmonic component in control loop is suppressed using Repetitive controller is improved, the two collective effect produces single Polarity S PWM ripple, and ensure the quality of power supply of output voltage.
In the described three phase combined inverter based on neutral net, the three-phase output of the three-phase control circuit is logical Cross grid-connected switch to be connected with exchange microgrid, exchange microgrid and power source is formed by inverter or generator, at the same it is linear load, non-thread Property load powered with unbalanced load by exchanging microgrid.
In the described three phase combined inverter based on neutral net, the fundamental voltage gain of single closed-loop control and dynamic State response speed is provided by ratio quasi resonant control, and the frequency domain transfer function form of ratio quasi resonant control is as shown in formula：
There is equivalent some cycle delays in the PWM actions of Digital Discrete control system, while inverter output filter is deposited In fundamental phase shift, controller is caused to export the delayed phase of regulated quantity response, either resonant controller or repetitive controller, It is required for carrying out this delay advanced correction compensation., can be inclined by adjusting the distribution of controller zero point for resonant controller Move, phase correction is carried out by the phase of Configuration Control Unit zero point.This strategy passes through the molecule item zero point to resonant controller Reached by increasing phase offset, it is purposeful clear and definite, it is easy to accomplish the advantages of.
Therefore described quasi- PR controls calculator, consider that quasi- PR during phase compensation controls the frequency domain transfer function of calculator As formula is：
Wherein the molecule of resonant controller is in zero point ωNPlace's compensation phase, wherein φ is desired compensation at resonant frequency Phase value.
At resonant frequency after the anticipatory control of zero point phase controller Bode figure as shown in figure 5,1,2,3 curves be respectively with The curve of phase increase is compensated, gain is basically unchanged at amplitude versus frequency characte resonant frequency, but phase-frequency characteristic is positive at resonant frequency Skew.The forward migration compensate for the delayed phase as caused by controlled system phase shift and digital delaying time of controller.Ring controller Should be timely, control error caused by reducing phase offset.
The Repetitive controller calculator purpose in parallel with quasi- PR control calculators is to provide master for the modulating wave of through path The harmonic components amount regulation passage wanted.It is as shown in Figure 6 that PR- repeats composite controller structured flowchart.
Q is error intergal parameter in Repetitive controller, if so that complete floating follows given during systematic steady state, need to cause Q =1, but z-NIntegral element introduces unit circle limit on N number of z-plane, causes system neutrality.Therefore usual sacrificial system Stable state follow index, Q takes the constant less than 1.Then error Cycle by Cycle integration can be expressed as difference equation as shown in formula：
U (k)=E (k)+QU (k-N)；
The pure time delay module of through path, by U (k) one period effects of delay, will miss this cycle after error Cycle by Cycle integration The regulated quantity of difference works when being just better than next periodic perturbation effect.
krzkC (z) forms gain and the penalty function of Repetitive controller, and c (z) to the transmission function of controlled device by carrying out Amplitude versus frequency characte compensates, and reduces the latent instability factor that controlled device amplitude versus frequency characte is brought by resonance peak.Due to penalty function with The delayed phase of low-frequency range can be brought after controlled device superposition, z can be used-kRepresent, to meet that Repetitive controller acts on moment accurate position In the disturbance moment, it is necessary to correct similar link using similar resonant controller leading phase, z is used in Repetitive controllerkEffect In through path so that adjustment effect delay N-k, which is clapped, carries out phase lead compensation, to reach preferable regulating effect.krAttach most importance to The forward direction regulation gain controlled again.
Design to repeating controlling unit penalty function c (z), can be according to LC wave filters in controlled device zero load transmission function Resonance characteristic compensate, LC filter transfer functions such as formula：
L is filter inductance in formula, and C is filter resistor, and R is wave filter equivalent damping, and it has resonant frequency
In the described three phase combined inverter based on neutral net, the neural network parameter adjuster is specially BP calculators；
The output of each neuron of the output layer of neural network all the way of the neural network parameter adjuster corresponds to standard respectively PR controls 3 parameter K of calculatorP、Kr、ωc, the output of each neuron of another way neural network output layer corresponds to respectively to be weighed 3 parameter K of calculator are controlled againP、Qf、ωp；According to current inverter output voltage VoWith reference voltage VrefError, adjust Weight coefficient ω between whole each layer neuronijAnd ωjl, make parameter value of the neural network module output suitable for current state, and Parameter after neural network module is adjusted passes to quasi- PR control calculators and Repetitive controller calculator.
Neural network control algolithm generates emulation module in Matlab/Simulink platforms with S-Funcation, then Quasi- PR controllers and repetitive controller carry out closed-loop control to inverter output voltage.
The structure of BP neural network, by transmission function discretization, obtains kth time as shown in fig. 7, by taking quasi- PR controllers as an example The output of sampling instant controller, i.e.,：
The value of 3 neurons of output layer of BP neural network is defined the parameter K of PR controllersP、Kr、ωc。
The input of 3 neurons of neural network input layer is divided into reference voltage Vref, inverter output voltage VoWith both electricity Press error ei.The input and output of each neuron of input layer are respectively Vi (1)With
WithThe input and output of each neuron of hidden layer are represented respectively, i.e.,：
In formula, f (χ) is the activation primitive of hidden layer, using sigmoid functions.
Vl (3)WithThe input and output of each neuron of output layer are represented respectively, i.e.,：
By reference voltage VrefAs echo signal, defining error function is：
The weights between neuron are asked to change using gradient descent method, i-th of neuron of hidden layer to j-th of god of output layer It is ω through the weights between memberjl, its learning algorithm uses additional guide vanes.The then weights regulation formula with the additional momentum factor For：
In formula：K is frequency of training；Mc is factor of momentum, takes 0.95 or so；η is pace of learning.
Wherein：
Then：
Use sign functionTo replace, error caused by this conversion can be mended by regularized learning algorithm speed η Repay.
3 neurons of output layer represent K respectivelyP、Kr、ωc, obtain：
The learning algorithm that neutral net output layer weight coefficient can be obtained is：
The learning algorithm that hidden layer weight coefficient can similarly be obtained is：
Composite controller structure based on the quasi- ratio resonance of neutral net and Repetitive controller, to the high electric energy matter of output voltage Amount requires that simultaneously decaying dc is inclined using the open-loop gain based on phase lead compensation quasi resonant control precision improvement fundamental voltage Put.The harmonic component in control loop is suppressed using Repetitive controller is improved, the two collective effect produces Unipolar SPWM Modulating wave, and ensure the quality of power supply of output voltage.
Neural network algorithm and quasi- PR algorithms are combined, quasi- PR digital controls precision is solved and is not enough stranded with parameter tuning The problem of difficult, this quasi- PR control methods based on neural network parameter Self-tuning System, make system dynamic response performance faster, system Adaptive degree is higher, using the open-loop gain based on phase lead compensation quasi resonant control precision improvement fundamental voltage and declines Subtract direct current biasing.Repetitive controller is a kind of control thought based on inner membrance principle, using Repetitive controller to humorous in control loop Wave component is suppressed, and has certain nonlinear load rejection ability, adds BP neural network on this basis, utilizes BP god Through network to the approximation capability of nonlinear function and the adaptive ability of height, to realize the Self-tuning System of Repetitive controller parameter.This Invention reduces fundamental wave steady-state error and improves that three phase full bridge microgrid inverter band is non-linear and the ability of unbalanced load, makes Control system is intelligent.
In the described three phase combined inverter based on neutral net, the vice-side winding of three single-phase transformers Connected for Y types.
The voltage of the present invention, current detection circuit is as shown in figure 8, sampled voltage current circuit is all identical, using voltage suddenly Your sensor CHV-50P samples to the voltage on electric capacity, electric currents of the current Hall sensor CHB-25NP to outflow inductance Sampled, by taking A phases as an example, the electric current of sampling obtains UM by the sampling resistor RM of Hall sensor, through isolating, biasing, low ARM A/D mouths are input to after pass filter and clamped process.
The current foldback circuit of the present invention is as shown in figure 9, current foldback circuit for inverter current, the circuit is by two It is grouped into, the precise rectification circuit that Part I is made up of amplifier AD8662, resistance, di-cap, zero is less than to electric current Divide and handled, Part II is made up of voltage comparator LM219, realizes that excessively stream compares.
The drive circuit of the present invention is as shown in Figure 10, and photoelectrical coupler driving chip, the core are driven using HCPL-3120 doors Piece can directly drive 1200V/100A IGBT, 3 pin of optocoupler be accessed by the pwm signal of control circuit output, by isolating, putting Greatly, IGBT is driven.
The control circuit control unit of the present invention realizes the software programming part of system, by control chip STM32F4 series Complete, select the STM32F407 of ST companies that there is low precision height, cost, small power consumption, be applicable floating-point operation as master controller Deng.
For the feasibility and validity of the checking present invention, system emulation is carried out.
Figure 11 is to exchange microgrid inverter under linear loading condition, the three-phase voltage waveform controlled using NEW TYPE OF COMPOSITE, Can obtain this system from waveform can stablize continuous service, and the sine degree of voltage waveform is at a relatively high.
Figure 12 be exchange microgrid inverter in the case of nonlinear load, the three-phase voltage waveform of output can be with from waveform Find out this NEW TYPE OF COMPOSITE controller, in the case of linear load or nonlinear load, effect is all highly desirable.
Figure 13 is in the case of nonlinear load, and by taking A phase voltage waveforms as an example, A phase voltage waveforms are carried out into FFT points Analysis, sinusoidal wave distortion rate (THD) are 1.98%, and voltage waveform distortion situation has obtained good correction.
Figure 14 is to exchange microgrid inverter in the case of unbalanced load, the three-phase voltage waveform of output.A phases are without negative Carrying, B, C phase have output waveform during load, from waveform it can be seen that this system is in the case of 100% three-phase imbalance load, It can guarantee that voltage stabilization exports.
The present invention exchanges in micro-capacitance sensor for isolated island on the basis of three phase combined inverter structure and load harmonic be present The problem of complicated component and higher degree of unbalancedness, a kind of NEW TYPE OF COMPOSITE controller is proposed, i.e., quasi- ratio resonance (PR) controls with repeating System is combined, and control system is designed.This invention has considered quasi- ratio resonant controller and Repetitive controller Advantage.It is proposed a kind of Compound Control Strategy of quasi- ratio resonance-Repetitive controller based on parallel-connection structure, and comparative example quasi-resonance with Repetitive controller makes improvement, reduces fundamental wave steady-state error, and improves three phase full bridge microgrid inverter with nonlinear load Ability.
With advantages below：
Using three phase combined inverter structure, have voltage utilization is high, three-phase can independent control anti-unbalance power it is strong. Solve the problems, such as the problem of laod unbalance and phase shortage, in system load imbalance or lacuna, other mutually remain to normal work；
The advantages of can at utmost playing full-bridge inverter using three single-phase inverter separate control solutions；
Using NEW TYPE OF COMPOSITE controller, i.e., quasi- ratio resonance (PR) is combined with Repetitive controller, and this is designed to realization pair The DAZ gene of sinusoidal ac signal；
Using such a composite controller, inverter output waveforms quality is improved, reduces percent harmonic distortion, there is good move State property energy；
Using STM32F407 chips, as main control chip, have the advantages that precision is high, cost is low, small power consumption, it is main Be support floating-point operation, improve system processing real-time.
As seen through the above description of the embodiments, those skilled in the art can be understood that the present invention can Realized by the mode of software plus required general hardware platform.Each embodiment in this specification uses progressive side Formula describes, between each embodiment identical similar part mutually referring to, what each embodiment stressed be and its The difference of his embodiment.For system embodiment, because it is substantially similar to embodiment of the method, so retouching That states is fairly simple, and the relevent part can refer to the partial explaination of embodiments of method.
Although depicting the present invention by embodiment, it will be appreciated by the skilled addressee that the present invention have it is many deformation and Change the spirit without departing from the present invention, it is desirable to which appended claim includes these deformations and changed without departing from the present invention's Spirit.

Claims (7)

  1. A kind of 1. three phase combined inverter based on neutral net, it is characterised in that including：DC voltage is filtered The DC filtering circuit of processing, the bridge-type high frequency modulated circuit of ABC three-phase independences, the ac filter circuit of ABC three-phase independences, point Not Cai Ji three-phase output voltage and output current sensor group and isolated form three-phase transformer, and each independent three-phase Control circuit；
    It is described to include per phase control circuit：AD samplings, composite controller, PWM are calculated, bridge type three-phase anti-unbalance inverter, The bridge type three-phase anti-unbalance inverter is made up of mutually three groups of single-phase power pipe inversion full-bridges and three single-phase transformers Independent output loop, per phase loop by the phase inversion full-bridge and the phase transformer being independently arranged in the full-bridge output loop Primary side winding is formed.
  2. 2. the three phase combined inverter based on neutral net as claimed in claim 1, it is characterised in that the compound control Device processed includes：Controller and neural network parameter adjuster, the controller includes quasi- PR controls calculator, Repetitive controller calculates Device.
  3. 3. the three phase combined inverter based on neutral net as claimed in claim 1, it is characterised in that described three is phased The three-phase output of circuit processed is connected by grid-connected switch with exchange microgrid, and exchange microgrid forms power by inverter or generator Source, while linear load, nonlinear load are powered with unbalanced load by exchanging microgrid.
  4. 4. the three phase combined inverter based on neutral net as claimed in claim 2, it is characterised in that described quasi- PR Calculator is controlled specifically, considering that quasi- PR during phase compensation controls the frequency domain transfer function form of calculator to be：
    <mrow> <msub> <mi>G</mi> <mrow> <mi>P</mi> <mi>R</mi> </mrow> </msub> <mrow> <mo>(</mo> <mi>s</mi> <mo>)</mo> </mrow> <mo>=</mo> <msub> <mi>K</mi> <mi>p</mi> </msub> <mo>+</mo> <msub> <mi>&amp;omega;</mi> <mi>&amp;xi;</mi> </msub> <msub> <mi>K</mi> <mi>U</mi> </msub> <mfrac> <mrow> <mi>s</mi> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mrow> <mo>(</mo> <mi>&amp;phi;</mi> <mo>)</mo> </mrow> <mo>-</mo> <msub> <mi>&amp;omega;</mi> <mi>N</mi> </msub> <mi>s</mi> <mi>i</mi> <mi>n</mi> <mrow> <mo>(</mo> <mi>&amp;phi;</mi> <mo>)</mo> </mrow> </mrow> <mrow> <msup> <mi>s</mi> <mn>2</mn> </msup> <mo>+</mo> <msub> <mi>&amp;omega;</mi> <mi>&amp;xi;</mi> </msub> <mi>s</mi> <mo>+</mo> <msubsup> <mi>&amp;omega;</mi> <mi>N</mi> <mn>2</mn> </msubsup> </mrow> </mfrac> </mrow>
    Wherein the molecule of resonant controller is in zero point ωNPlace's compensation phase, wherein φ is desired compensation phase at resonant frequency Value.
  5. 5. the three phase combined inverter based on neutral net as claimed in claim 2, it is characterised in that described repetition Control calculator be specially：
    Error Cycle by Cycle integration can be expressed as difference equation as shown in formula：
    U (k)=E (k)+QU (k-N), Q is error intergal parameter；
    krzkC (z) forms gain and the penalty function of Repetitive controller, and c (z) to the transmission function of controlled device by carrying out amplitude-frequency Characteristic compensation；Z is used in Repetitive controllerkAct on through path；krGain is adjusted for the forward direction of Repetitive controller；To Repetitive controller Link penalty function c (z) design, it can be mended according to the resonance characteristic of LC wave filters in controlled device zero load transmission function Repay, LC filter transfer functions such as formula：
    <mrow> <msub> <mi>G</mi> <mrow> <mi>L</mi> <mi>C</mi> </mrow> </msub> <mrow> <mo>(</mo> <mi>s</mi> <mo>)</mo> </mrow> <mo>=</mo> <mfrac> <mn>1</mn> <mrow> <msup> <mi>LCs</mi> <mn>2</mn> </msup> <mo>+</mo> <mi>s</mi> <mi>R</mi> <mi>C</mi> <mo>+</mo> <mn>1</mn> </mrow> </mfrac> </mrow>
    L is filter inductance in formula, and C is filter resistor, and R is wave filter equivalent damping, and it has resonant frequency
  6. 6. the three phase combined inverter based on neutral net as claimed in claim 3, it is characterised in that the nerve net Network parameter adjuster is specially BP calculators；
    The output of each neuron of the output layer of neural network all the way of the neural network parameter adjuster corresponds to quasi- PR controls respectively 3 parameter K of calculator processedP、Kr、ωc, the output of each neuron of another way neural network output layer corresponds to respectively to be repeated to control 3 parameter K of calculator processedP、Qf、ωp；According to current inverter output voltage VoWith reference voltage VrefError, adjustment is each Weight coefficient ω between layer neuronijAnd ωjl, make parameter value of the neural network module output suitable for current state, and by god Parameter after mixed-media network modules mixed-media is adjusted passes to quasi- PR control calculators and Repetitive controller calculator.
  7. 7. the three phase combined inverter based on neutral net as claimed in claim 1, it is characterised in that three lists The vice-side winding of phase transformer connects for Y types.
CN201711191569.0A 2017-11-24 2017-11-24 A kind of three phase combined inverter based on neutral net Pending CN107896071A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108933450A (en) * 2018-08-08 2018-12-04 湖南工业大学 The quasi- proportional resonant control method of PI- based on radial basis function neural network
CN109617434A (en) * 2018-12-21 2019-04-12 十堰天舒感应设备有限公司 A kind of mixing control method of Three-Phase PWM Rectifier
CN110034699A (en) * 2019-05-21 2019-07-19 江苏和网源电气有限公司 A kind of novel inverter and control method
CN110198136A (en) * 2019-01-30 2019-09-03 哈尔滨理工大学 Combined type controls full bridge inverse conversion power

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108933450A (en) * 2018-08-08 2018-12-04 湖南工业大学 The quasi- proportional resonant control method of PI- based on radial basis function neural network
CN109617434A (en) * 2018-12-21 2019-04-12 十堰天舒感应设备有限公司 A kind of mixing control method of Three-Phase PWM Rectifier
CN110198136A (en) * 2019-01-30 2019-09-03 哈尔滨理工大学 Combined type controls full bridge inverse conversion power
CN110034699A (en) * 2019-05-21 2019-07-19 江苏和网源电气有限公司 A kind of novel inverter and control method
CN110034699B (en) * 2019-05-21 2023-10-10 江苏和网源电气有限公司 Inverter power supply and control method

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Application publication date: 20180410