CN107895949A - A kind of Harmonic Control Method of photovoltaic group string inverter - Google Patents

A kind of Harmonic Control Method of photovoltaic group string inverter Download PDF

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Publication number
CN107895949A
CN107895949A CN201711024386.XA CN201711024386A CN107895949A CN 107895949 A CN107895949 A CN 107895949A CN 201711024386 A CN201711024386 A CN 201711024386A CN 107895949 A CN107895949 A CN 107895949A
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mrow
current
msub
mfrac
harmonic
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倪福银
沃松林
王琪
陈立兴
朱成喜
赵源
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Jiangsu University of Technology
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Jiangsu University of 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
    • H02J3/01—Arrangements for reducing harmonics or ripples
    • H02J3/383—
    • 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers
    • 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
    • Y02E40/40—Arrangements for reducing harmonics

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

Abstract

The present invention relates to photovoltaic DC-to-AC converter technical field, especially a kind of Harmonic Control Method of photovoltaic group string inverter, its step is：Voltage and current signal detects, and microprocessor calculates fundamental active current ip, fundamental active current ipSubtract each other i with load currentLShow that harmonic compensation current instruction isThis signal is reached micro-capacitance sensor controller by microprocessor；Coordinate the micro-capacitance sensor controller of level after the harmonic compensation current instruction that group string inverter transmits is received, coordinate control group string inverter 1 and suspend photovoltaic generation task, be converted into and carry out harmonic controling task；Microcontroller carries out internal model PI control generation SPWM signals to compensation electric current；Microprocessor output pwm signal to drive circuit carries out harmonic compensation, drive circuit module receives the pwm signal that microprocessor is sent, corresponding output harmonic wave current compensation power distribution network, until the electrical generation burden instruction that the micro-capacitance sensor controller for receiving coordination level is new, the General Promotion photovoltaic distributed power source quality of power supply of the present invention.

Description

A kind of Harmonic Control Method of photovoltaic group string inverter
Technical field
The present invention relates to photovoltaic DC-to-AC converter technical field, specific field is a kind of harmonic controling of photovoltaic group string inverter Method.
Background technology
Due to including photovoltaic DC-to-AC converter power electronic equipment in photovoltaic distributed generation system, and user side is non-linear Load etc. easily causes system power, voltage waveform to be distorted, and causes the qualities of power supply such as harmonic pollution and the reactive loss of power network Problem, in addition photovoltaic distributed power source there is extremely strong intermittence and randomness, its combining inverter can not be maintained at specified defeated Go out under operating mode, output capacity greatly wastes, and the grid-connected power capacity factor maintains reactive power and voltage all than relatively low Optimized operation be also photovoltaic system be badly in need of solve key issue.
Intelligent body (Agent) is a kind of with autonomy, social and reactive intelligent entity, and it can foundation Actual conditions determine factum, at the same exchange information with other intelligent bodies, knowledge is most idealized to solve problem Result.Multi-agent system (Multi-Agent System are MAS) is properly termed as multi-agent system again, and it is by many The complication system of Agent compositions, this system form the solution network solved the problems, such as by way of cooperation, and it is also by more The individual individual with Dynamic Evolution Characteristics passes through the local system for cooperating and interacting and formed.Multi-agent system possesses certainly The characteristics such as main property, collaborative and distributivity, each intelligent body can not be directly realized by global control, and they all have partial information And problem solving ability, the distributed autonomous system that MAS is complicated as one, open, it can solve the problem that single Agent can not Solve it is relatively complicated the problem of.In the whole network system that multiple agent is formed, each intelligent body can be by mutual Communication understands the situation of other intelligent bodies, and can change itself according to the situation of system or other Agent are whole to ensure The stabilization of system.
The distributed generation system that the present invention is formed for group string inverter, proposes to be applied to using multi-agent Technology In photovoltaic group string inverter, by multi-agent Technology, by the micro-capacitance sensor controller of coordination level to performing the group string inverter of level Coordination control is carried out, harmonic wave control function is converted into by generating function.In addition, internal model PI is used to harmonic current compensation instruction Control production pwm signal, setting method is simple, the shortcomings that conventional PI control parameters adjust complexity is overcome, in Practical Project Acted on good practice.
The content of the invention
It is an object of the invention to provide a kind of Harmonic Control Method of photovoltaic group string inverter, to solve prior art The problem of harmonic compensation in middle photovoltaic power distribution network.
To achieve the above object, the present invention provides following technical scheme：A kind of harmonic controling side of photovoltaic group string inverter Method, its step are：
(1), voltage and current signal detects：The signal acquisition module of photovoltaic group string inverter detects power distribution network bus in real time Voltage usWith load current iL, microcontroller is sent to through Signal-regulated kinase；
(2), microprocessor calculates fundamental active current ip：Power network busbar voltage us,iLFor load current, p is instantaneously to have Work(power, P be p DC component, Ip、ip、icFundamental active current that respectively reference method detects, fundamental active electricity The harmonic current that stream, needs compensate.In microcontroller, by single-phase load current iLConstruct α, β biphase currentiα90 ° of hysteresis obtains iβ,
By busbar voltage usConstruct α, β two-phase voltageuα90 ° of hysteresis obtains uβ,
Then uαWith uβModulus value voltage
Instantaneous active power is p=uαiα+uβiβ, then by low pass filter (LPF), cut-off frequency 50HZ, warp Cross and fundamental active current is calculated is
(3), fundamental active current ipSubtract each other i with load currentLShow that harmonic compensation current instruction isMicroprocessor will This signal reaches micro-capacitance sensor controller；
(4) the micro-capacitance sensor controller of level, is coordinated after the harmonic compensation current instruction that group string inverter transmits is received, Coordinate control group string inverter 1 and suspend photovoltaic generation task, be converted into and carry out harmonic controling task；
(5), microcontroller carries out internal model PI control generation SPWM signals to compensation electric current；
(6), microprocessor output pwm signal to drive circuit carries out harmonic compensation, and drive circuit module receives microprocessor The pwm signal that device is sent, corresponding output harmonic wave current compensation power distribution network, until the micro-capacitance sensor controller for receiving coordination level is new Electrical generation burden instruction.
Preferably, step (4) operation need to carry out inner membrance controller design, and its step is：
1., in photovoltaic group string inverter microprocessor internal, input r (s) is defined as fundamental active current ip, export y (s) it is defined as load current iL, d (s) is defined as source current is, G (s) is drive circuit output compensation electric current ic, internal model control Device transmission function processed is Gc(s), internal mode controller GIMC(s), internal object model is GM(s)；
2., inner membrance controller design step be：A, internal object model GM (s) is determined, drive circuit function G (s) is：
B, model decomposition, i.e., GM(s) it is decomposed into GM+(s), GM-(s) two parts：
GM(s)=GM+(s)·GM-(s) (2)
C, internal mode controller is generated, defines inner membrance controller function GIMC(s),
To the purely retarded expression formula e in transmission function G (s)-τsObtained using single order Pade approximations
According to formula (1), (2), (3), (4), the inner membrance controller function obtained in group string inverter is：
Then internal mode controller transmission function is Gc(s) it is：
Preferably, controlled according to formula (6) using internal model PI, then transmission function is Gc(s) it is rewritten as：
By (7) formula, then PI controller parameters K is corresponded top,KiRespectively:
Preferably, in described step (5), in group microprocessor of string inverter, adjusting parameter Tf(T in an experimentf Value is 3.5 τ), that is, obtain the parameter K of PI controller optimizationsp,KiValue, harmonic compensation current instructionControlled by internal model PI Modulation generation pwm signal.
Preferably, K is Steady-state process gain, value 4, and T is process time constant, value 0.8s, and value is 0.06s.Work as GM(s)=G (s), that is, reach Model Matching,
GM+(s) it is an all-pass filter transmission function, GM-(s) it is the transmission function with minimum phase characteristic,
TfFor all-pass filter coefficient, order coefficient gamma value is 1 herein.
Compared with prior art, the beneficial effects of the invention are as follows：Fundamental wave is calculated by building α, β two-phase voltage in it Active magnitude current, then detect that harmonic current compensation instructs.By multi-agent Technology, by the micro-capacitance sensor control of coordination level Device processed carries out coordination control to the group string inverter for performing level, and harmonic wave control function is converted into by generating function, in a group string inversion In device microprocessor, good control effect, setting method letter can be reached because internal model PI controllers need only adjust a parameter It is single, the shortcomings that conventional P I control parameters adjust complexity is overcome, and there is good dynamic characteristic, overcome photovoltaic generation Randomness, therefore use internal model PI controllers to produce pwm signal, it is easy to a group quick compensation for string inverter harmonic, so as to realize The harmonic control function of photovoltaic group string inverter, improve the quality of power supply of photovoltaic distributed power generation；
In the method, by multi-agent Technology, by group string inversion of the micro-capacitance sensor controller of coordination level to execution level Device carries out coordination control, and harmonic wave control function is converted into by generating function.In addition, internal model is used to harmonic current compensation instruction PI control production pwm signals, Internal Model PID Controller, which need only adjust a parameter, can reach good control effect, setting method Simply, the shortcomings that conventional P I control parameters adjust complexity is overcome, and there is good dynamic characteristic, is easy to a group string inversion The quick compensation of device harmonic wave.
Brief description of the drawings
Fig. 1 is the group string inverter harmonic current detecting block diagram of the present invention；
Fig. 2 is the present invention based on multiple agent photovoltaic DC-to-AC converter coordination control system block diagram；
Fig. 3 is the group string inverter harmonic current compensation control schematic diagram of the present invention.
Fig. 4 is the inner membrance controller equivalent block diagram of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on Embodiment in the present invention, those of ordinary skill in the art obtained under the premise of creative work is not made it is all its His embodiment, belongs to the scope of protection of the invention.
Fig. 1 to 4 is referred to, the present invention provides a kind of technical scheme：A kind of harmonic controling side of photovoltaic group string inverter Method, the first step, voltage and current signal detection：
Referring to Fig. 1, the signal acquisition module of photovoltaic group string inverter detects power distribution network busbar voltage u in real timesWith load electricity Flow iL, microcontroller is sent to through Signal-regulated kinase.
Second step, microprocessor calculate fundamental active current ip：
Referring to Fig. 1, power network busbar voltage us,iLFor load current, p is instantaneous active power, and P is p DC component, Ip、ip、icThe harmonic current that fundamental active current that respectively reference method detects, fundamental active current, needs compensate. In microcontroller, by single-phase load current iLConstruct α, β biphase currentiα90 ° of hysteresis obtains iβ。
By busbar voltage usConstruct α, β two-phase voltageuα90 ° of hysteresis obtains uβ, then uαWith uβModulus value Voltage
Instantaneous active power is p=uαiα+uβiβ, then by low pass filter (LPF), cut-off frequency 50HZ, root According to Fig. 1, it is by fundamental active current is calculated
Then fundamental active current ipSubtract each other i with load currentLShow that harmonic compensation current instruction isMicroprocessor will This signal reaches micro-capacitance sensor controller.
3rd step, referring to Fig. 2, coordinate the micro-capacitance sensor controller of level in the harmonic compensation for receiving group string inverter and transmitting After current-order, coordinate control group string inverter 1 and suspend photovoltaic generation task, be converted into and carry out harmonic controling task.Enter first Row inner membrance controller design, is concretely comprised the following steps：
In photovoltaic group string inverter microprocessor internal, referring to Fig. 3, Fig. 4, input r (s) is defined as fundamental active current ip, export y (s) and be defined as load current iL, d (s) is defined as source current is, G (s) is drive circuit output compensation electric current ic, internal mode controller transmission function is Gc(s), internal mode controller GIMC(s), internal object model is GM(s)。
Inner membrance controller design step is：
(1) internal object model G is determinedM(s).It is referring to Fig. 4, drive circuit function G (s)：
Wherein K is Steady-state process gain, value 4, and T is process time constant, value 0.8s, value 0.06s. Work as GM(s)=G (s), that is, reach Model Matching, and inner membrance controller can just be optimal design.
(2) model decomposition, i.e., GM(s) it is decomposed into GM+(s), GM-(s) two parts：
GM(s)=GM+(s)·GM-(s) (2)
Wherein GM+(s) it is an all-pass filter transmission function, GM-(s) it is the transmission letter with minimum phase characteristic Number.
(3) internal mode controller is generated, defines inner membrance controller function GIMC(s),
T in formulafFor all-pass filter coefficient, order coefficient gamma value is 1 herein.
To the purely retarded expression formula e in transmission function G (s)-τsObtained using single order Pade approximations
According to formula (1), (2), (3), (4), the inner membrance controller function obtained in group string inverter is：
Then internal mode controller transmission function is Gc(s) it is：
4th step, microcontroller carry out internal model PI control generation SPWM signals to compensation electric current.According in formula (6) use Mould PI is controlled, then transmission function is Gc(s) it is rewritten as
By (7) formula, then PI controller parameters K is corresponded top,KiRespectively:
Referring to Fig. 3, in group microprocessor of string inverter, adjusting parameter T is only neededf(T in an experimentfValue is 3.5 τ), that is, the parameter K of PI controller optimizations is obtainedp,KiValue, harmonic compensation current instructionModulation generation is controlled by internal model PI Pwm signal.
5th step, microprocessor output pwm signal to drive circuit carry out harmonic compensation.Drive circuit module receives micro- The pwm signal that processor is sent, corresponding output harmonic wave current compensation power distribution network, until receiving the micro-capacitance sensor control for coordinating level The new electrical generation burden instruction of device.
In the method, by multi-agent Technology, by group string inversion of the micro-capacitance sensor controller of coordination level to execution level Device carries out coordination control, and harmonic wave control function is converted into by generating function.In addition, internal model is used to harmonic current compensation instruction PI control production pwm signals, Internal Model PID Controller, which need only adjust a parameter, can reach good control effect, setting method Simply, the shortcomings that conventional P I control parameters adjust complexity is overcome, and there is good dynamic characteristic, is easy to a group string inversion The quick compensation of device harmonic wave.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with A variety of changes, modification can be carried out to these embodiments, replace without departing from the principles and spirit of the present invention by understanding And modification, the scope of the present invention is defined by the appended.

Claims (5)

  1. A kind of 1. Harmonic Control Method of photovoltaic group string inverter, it is characterised in that：Its step is：
    (1), voltage and current signal detects：The signal acquisition module of photovoltaic group string inverter detects power distribution network busbar voltage u in real times With load current iL, microcontroller is sent to through Signal-regulated kinase；
    (2), microprocessor calculates fundamental active current ip：Power network busbar voltage us,iLFor load current, p is instantaneous active work( Rate, P be p DC component, Ip、ip、icFundamental active current that respectively reference method detects, fundamental active current, needs The harmonic current of compensation.In microcontroller, by single-phase load current iLConstruct α, β biphase currentiαHysteresis 90 ° obtain iβ,
    By busbar voltage usConstruct α, β two-phase voltageuα90 ° of hysteresis obtains uβ,
    Then uαWith uβModulus value voltage
    Instantaneous active power is p=uαiα+uβiβ, then by low pass filter (LPF), cut-off frequency 50HZ, by calculating Obtaining fundamental active current is
    (3), fundamental active current ipSubtract each other i with load currentLShow that harmonic compensation current instruction isMicroprocessor believes this Number reach micro-capacitance sensor controller；
    (4), coordinate the micro-capacitance sensor controller of level after the harmonic compensation current instruction that group string inverter transmits is received, coordinate control Processed group of string inverter 1 suspends photovoltaic generation task, is converted into and carries out harmonic controling task；
    (5), microcontroller carries out internal model PI control generation SPWM signals to compensation electric current；
    (6), microprocessor output pwm signal to drive circuit carries out harmonic compensation, and drive circuit module receives microprocessor hair The pwm signal sent, corresponding output harmonic wave current compensation power distribution network, until the generating that the micro-capacitance sensor controller for receiving coordination level is new Assignment instructions.
  2. A kind of 2. Harmonic Control Method of photovoltaic group string inverter according to claim 1, it is characterised in that：Step (4) Operation need to carry out inner membrance controller design, and its step is：
    1., in photovoltaic group string inverter microprocessor internal, input r (s) is defined as fundamental active current ip, output y (s) definition For load current iL, d (s) is defined as source current is, G (s) is drive circuit output compensation electric current ic, internal mode controller transmission Function is Gc(s), internal mode controller GIMC(s), internal object model is GM(s)；
    2., inner membrance controller design step be：A, internal object model G is determinedM(s).Referring to Fig. 6, drive circuit function G (s) For：
    <mrow> <mi>G</mi> <mrow> <mo>(</mo> <mi>s</mi> <mo>)</mo> </mrow> <mo>=</mo> <mfrac> <mi>K</mi> <mrow> <mn>1</mn> <mo>+</mo> <mi>T</mi> <mi>s</mi> </mrow> </mfrac> <msup> <mi>e</mi> <mrow> <mo>-</mo> <mi>&amp;tau;</mi> <mi>s</mi> </mrow> </msup> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow>
    B, model decomposition, i.e., GM(s) it is decomposed into GM+(s), GM-(s) two parts：
    GM(s)=GM+(s)·GM-(s) (2)
    C, internal mode controller is generated, defines inner membrance controller function GIMC(s),
    <mrow> <msub> <mi>G</mi> <mrow> <mi>I</mi> <mi>M</mi> <mi>C</mi> </mrow> </msub> <mrow> <mo>(</mo> <mi>s</mi> <mo>)</mo> </mrow> <mo>=</mo> <msubsup> <mi>G</mi> <mrow> <mi>M</mi> <mo>-</mo> </mrow> <mrow> <mo>-</mo> <mn>1</mn> </mrow> </msubsup> <mrow> <mo>(</mo> <mi>s</mi> <mo>)</mo> </mrow> <mo>&amp;CenterDot;</mo> <mfrac> <mn>1</mn> <msup> <mrow> <mo>(</mo> <msub> <mi>T</mi> <mi>f</mi> </msub> <mi>s</mi> <mo>+</mo> <mn>1</mn> <mo>)</mo> </mrow> <mi>&amp;gamma;</mi> </msup> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow>
    To the purely retarded expression formula e in transmission function G (s)-τsObtained using single order Pade approximations
    <mrow> <msup> <mi>e</mi> <mrow> <mo>-</mo> <mi>&amp;tau;</mi> <mi>s</mi> </mrow> </msup> <mo>&amp;ap;</mo> <mfrac> <mrow> <mn>1</mn> <mo>-</mo> <mn>0.5</mn> <mi>&amp;tau;</mi> <mi>s</mi> </mrow> <mrow> <mn>1</mn> <mo>+</mo> <mn>0.5</mn> <mi>&amp;tau;</mi> <mi>s</mi> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>4</mn> <mo>)</mo> </mrow> </mrow>
    According to formula (1), (2), (3), (4), the inner membrance controller function obtained in group string inverter is：
    <mrow> <msub> <mi>G</mi> <mrow> <mi>I</mi> <mi>M</mi> <mi>C</mi> </mrow> </msub> <mrow> <mo>(</mo> <mi>s</mi> <mo>)</mo> </mrow> <mo>=</mo> <mfrac> <mrow> <mo>(</mo> <mn>1</mn> <mo>+</mo> <mi>T</mi> <mi>s</mi> <mo>)</mo> <mo>(</mo> <mn>1</mn> <mo>+</mo> <mn>0.5</mn> <mi>&amp;tau;</mi> <mi>s</mi> <mo>)</mo> </mrow> <mrow> <mi>K</mi> <mrow> <mo>(</mo> <msub> <mi>T</mi> <mi>f</mi> </msub> <mi>s</mi> <mo>+</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>5</mn> <mo>)</mo> </mrow> </mrow>
    Then internal mode controller transmission function is Gc(s) it is：
    <mrow> <msub> <mi>G</mi> <mi>c</mi> </msub> <mrow> <mo>(</mo> <mi>s</mi> <mo>)</mo> </mrow> <mo>=</mo> <mfrac> <mrow> <mi>T</mi> <mo>+</mo> <mn>0.5</mn> <mi>&amp;tau;</mi> </mrow> <mrow> <mi>K</mi> <mrow> <mo>(</mo> <msub> <mi>T</mi> <mi>f</mi> </msub> <mo>+</mo> <mn>0.5</mn> <mi>&amp;tau;</mi> <mo>)</mo> </mrow> </mrow> </mfrac> <mo>&amp;lsqb;</mo> <mn>1</mn> <mo>+</mo> <mfrac> <mn>1</mn> <mrow> <mo>(</mo> <mi>T</mi> <mo>+</mo> <mn>0.5</mn> <mi>&amp;tau;</mi> <mo>)</mo> <mi>s</mi> </mrow> </mfrac> <mo>+</mo> <mfrac> <mrow> <mn>0.5</mn> <mi>T</mi> <mi>&amp;tau;</mi> </mrow> <mrow> <mi>T</mi> <mo>+</mo> <mn>0.5</mn> <mi>&amp;tau;</mi> </mrow> </mfrac> <mi>s</mi> <mo>&amp;rsqb;</mo> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>6</mn> <mo>)</mo> </mrow> <mo>.</mo> </mrow>
  3. A kind of 3. Harmonic Control Method of photovoltaic group string inverter according to claim 2, it is characterised in that：According to formula (6) controlled using internal model PI, then transmission function is Gc(s) it is rewritten as：
    <mrow> <msub> <mi>G</mi> <mi>c</mi> </msub> <mrow> <mo>(</mo> <mi>s</mi> <mo>)</mo> </mrow> <mo>=</mo> <mfrac> <mrow> <mi>T</mi> <mo>+</mo> <mn>0.5</mn> <mi>&amp;tau;</mi> </mrow> <mrow> <mi>K</mi> <mrow> <mo>(</mo> <msub> <mi>T</mi> <mi>f</mi> </msub> <mo>+</mo> <mn>0.5</mn> <mi>&amp;tau;</mi> <mo>)</mo> </mrow> </mrow> </mfrac> <mo>&amp;lsqb;</mo> <mn>1</mn> <mo>+</mo> <mfrac> <mn>1</mn> <mrow> <mo>(</mo> <mi>T</mi> <mo>+</mo> <mn>0.5</mn> <mi>&amp;tau;</mi> <mo>)</mo> <mi>s</mi> </mrow> </mfrac> <mo>&amp;rsqb;</mo> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>7</mn> <mo>)</mo> </mrow> </mrow>
    By (7) formula, then PI controller parameters K is corresponded top,KiRespectively:
    <mrow> <msub> <mi>K</mi> <mi>p</mi> </msub> <mo>=</mo> <mfrac> <mrow> <mi>T</mi> <mo>+</mo> <mn>0.5</mn> <mi>&amp;tau;</mi> </mrow> <mrow> <mi>K</mi> <mrow> <mo>(</mo> <msub> <mi>T</mi> <mi>f</mi> </msub> <mo>+</mo> <mn>0.5</mn> <mi>&amp;tau;</mi> <mo>)</mo> </mrow> </mrow> </mfrac> <mo>,</mo> <msub> <mi>K</mi> <mi>i</mi> </msub> <mo>=</mo> <mi>T</mi> <mo>+</mo> <mn>0.5</mn> <mi>&amp;tau;</mi> <mo>.</mo> </mrow>
  4. A kind of 4. Harmonic Control Method of photovoltaic group string inverter according to claim 3, it is characterised in that：Described step Suddenly in (5), in group microprocessor of string inverter, adjusting parameter Tf(T in an experimentfValue is 3.5 τ), that is, obtain PI controls The parameter K of device optimizationp,KiValue, harmonic compensation current instructionModulation generation pwm signal is controlled by internal model PI.
  5. A kind of 5. Harmonic Control Method of photovoltaic group string inverter according to claim 2, it is characterised in that：K is process Steady-state gain, value 4, T are process time constant, value 0.8s, value 0.06s.Work as GM(s)=G (s), that is, reach Model Matching,
    GM+(s) it is an all-pass filter transmission function, GM-(s) it is the transmission function with minimum phase characteristic,
    TfFor all-pass filter coefficient, order coefficient gamma value is 1 herein.
CN201711024386.XA 2017-10-27 2017-10-27 A kind of Harmonic Control Method of photovoltaic group string inverter Pending CN107895949A (en)

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Application publication date: 20180410