CN110957754A - Photovoltaic inverter based on harmonic suppression and harmonic suppression method - Google Patents

Photovoltaic inverter based on harmonic suppression and harmonic suppression method Download PDF

Info

Publication number
CN110957754A
CN110957754A CN201911037124.6A CN201911037124A CN110957754A CN 110957754 A CN110957754 A CN 110957754A CN 201911037124 A CN201911037124 A CN 201911037124A CN 110957754 A CN110957754 A CN 110957754A
Authority
CN
China
Prior art keywords
current
unit
harmonic
load current
output
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201911037124.6A
Other languages
Chinese (zh)
Inventor
周洪益
柏晶晶
唐华
马汝祥
胡志林
王慧
袁德刚
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Corp of China SGCC
Yancheng Power Supply Co of State Grid Jiangsu Electric Power Co Ltd
Original Assignee
State Grid Corp of China SGCC
Yancheng Power Supply Co of State Grid Jiangsu Electric Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by State Grid Corp of China SGCC, Yancheng Power Supply Co of State Grid Jiangsu Electric Power Co Ltd filed Critical State Grid Corp of China SGCC
Priority to CN201911037124.6A priority Critical patent/CN110957754A/en
Publication of CN110957754A publication Critical patent/CN110957754A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • 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
    • H02M7/539—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 with automatic control of output wave form or frequency
    • H02M7/5395—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 with automatic control of output wave form or frequency by pulse-width modulation
    • 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

Abstract

The invention provides a photovoltaic inverter based on harmonic suppression, which comprises a direct current input unit, an inversion unit, a current conditioning unit, a load current acquisition unit, a control processing unit, a harmonic compensation unit and an alternating current output unit; the photovoltaic inverter collects the load current, fundamental wave components and harmonic wave components are analyzed and calculated, harmonic wave compensation is further carried out, and the inverter outputs current signals with good sine degree. The invention provides a photovoltaic inverter based on harmonic suppression and a harmonic suppression method, which can detect harmonic components in real time, carry out effective harmonic compensation and ensure the quality of electric energy.

Description

Photovoltaic inverter based on harmonic suppression and harmonic suppression method
Technical Field
The invention belongs to the technical field of electric power detection, and particularly relates to a photovoltaic inverter based on harmonic suppression and a harmonic suppression method.
Background
In recent years, people have increasingly stronger environmental awareness, and photovoltaic power generation has gained unprecedented attention as a novel clean energy source. With the continuous development of electronic products, many nonlinear loads appear in the production and life of people, and further the waveform of the voltage at the output end of the photovoltaic inverter can be seriously deformed or even not be a sine wave. The harmonic waves have harmful effects on various electric power equipment and communication equipment, and can cause damage to the electric power equipment in serious cases.
The invention provides a photovoltaic inverter based on harmonic suppression, which collects load current, analyzes and calculates fundamental wave component and harmonic component, performs tracking adjustment and harmonic compensation on the output current of the inverter, and has good output current sine degree.
Disclosure of Invention
The invention provides a photovoltaic inverter based on harmonic suppression and a harmonic suppression method, which can detect harmonic components in real time, carry out effective harmonic compensation and ensure the quality of electric energy.
The invention particularly relates to a photovoltaic inverter based on harmonic suppression, which comprises a direct current input unit, an inversion unit, a current conditioning unit, a load current acquisition unit, a control processing unit, a harmonic compensation unit and an alternating current output unit, wherein the direct current input unit is sequentially connected with the inversion unit, the current conditioning unit and the alternating current output unit; the photovoltaic inverter collects the load current, fundamental wave components and harmonic wave components are analyzed and calculated, harmonic wave compensation is further carried out, and the inverter outputs current signals with good sine degree.
The load current acquisition unit acquires the load current output by the alternating current output unit by adopting a current sensor.
The inversion unit adopts a rectifier bridge to invert the direct current input by the direct current input unit and outputs an alternating current signal.
The current conditioning unit comprises a current hysteresis loop PWM current controller, and the hysteresis loop width of the hysteresis loop PWM current controller is h1、h2，h2Greater than h1And the alternating current signal output by the inversion unit is conditioned to realize the purpose of tracking the given current.
And the harmonic compensation unit performs harmonic compensation on the alternating current signal output by the inversion unit according to the control signal of the control processing unit.
The invention also provides a harmonic suppression method of the photovoltaic inverter based on harmonic suppression, which comprises the following steps:
step (1): the load current acquisition unit acquires the load current and outputs the load current to the control processing unit;
step (2): the control processing unit calculates the active component and the reactive component of the current according to the load current:
Figure BDA0002251820940000021
ipfor the active component of the current, iqFor the purpose of the reactive component of the current,
Figure BDA0002251820940000022
omega is the angular frequency, iaIs a phase A load current ibIs a B-phase load current, icIs a C-phase load current;
and (3): calculating the load current fundamental component:
Figure BDA0002251820940000023
iafis the A-phase fundamental component of the load current ibfIs the B-phase fundamental component of the load current icfIs the load current C phase fundamental component;
and (4): calculating a difference between the load current fundamental component and a current reference value
Figure BDA0002251820940000024
i is the current reference value difference;
and (5): comparing said difference with h2Comparing, if the difference is larger than h2Entering the step (6); if the difference is not more than h2Entering the step (7);
and (6): the output signal of the control processing unit is kept unchanged;
and (7): comparing said difference with h1Comparing, if the difference is larger than h1Entering the step (8); if the difference is not more than h1Entering the step (9);
and (8): the control processing unit outputs a positive level signal to control the current conditioning unit to output current to increase, and the step (10) is carried out;
and (9): the control processing unit outputs a negative level signal to control the current conditioning unit to output current to be reduced;
step (10): calculating the difference value between the load current and the load current fundamental component to obtain the load current harmonic component:
Figure BDA0002251820940000031
iakis the A-phase harmonic component of the load current ibkIs the B-phase harmonic component of the load current ickIs the load current C phase harmonic component;
step (11): increasing the phase of the harmonic component of the load current by 180 degrees to obtain a compensation current;
step (12): the controller controls the harmonic compensation unit to output the compensation current to the alternating current output unit.
Compared with the prior art, the beneficial effects are: the photovoltaic inverter collects the load current, fundamental wave components and harmonic wave components are analyzed and calculated, tracking adjustment and harmonic wave compensation are carried out on the output current of the inverter, and the sine degree of the output current is good.
Drawings
Fig. 1 is a schematic structural diagram of a photovoltaic inverter based on harmonic suppression according to the present invention.
Fig. 2 is a working flow chart of a harmonic compensation method of a photovoltaic inverter based on harmonic suppression according to the present invention.
Detailed Description
The following describes a specific embodiment of a photovoltaic inverter based on harmonic suppression according to the present invention in detail with reference to the accompanying drawings.
As shown in fig. 1, the photovoltaic inverter of the present invention includes a dc input unit, an inverter unit, a current conditioning unit, a load current collecting unit, a control processing unit, a harmonic compensation unit, and an ac output unit, wherein the dc input unit is sequentially connected to the inverter unit, the current conditioning unit, and the ac output unit, the load current collecting unit is respectively connected to the ac output unit and the control processing unit, and the harmonic compensation unit is respectively connected to the control processing unit and the ac output unit.
The load current acquisition unit acquires the load current output by the alternating current output unit by adopting a current sensor.
The inversion unit inverts the direct current input by the direct current input unit by adopting a rectifier bridge and outputs an alternating current signal.
The current conditioning unit comprises a current hysteresis PWM current controller with hysteresis width h1、h2And h is2Greater than h1The alternating current signal output by the inversion unit is conditioned, and the purpose of tracking the given current is achieved.
And the harmonic compensation unit performs harmonic compensation on the alternating current signal output by the inversion unit according to the control signal of the control processing unit.
As shown in fig. 2, the present invention further provides a harmonic suppression method for a photovoltaic inverter based on harmonic suppression, wherein the harmonic suppression method is implemented by using a harmonic suppression methodThe wave suppression method comprises the following steps: step (1): collecting load current and outputting the load current to the control processing unit; step (2): calculating the active component and the reactive component of the current; and (3): calculating a load current fundamental component; and (4): calculating the difference value of the load current fundamental component and the current reference value; and (5): the difference value is compared with the hysteresis width h2Comparing, if the difference is larger than h2Entering the step (6); if the difference is not more than h2Entering the step (7); and (6): the output signal of the control processing unit is kept unchanged, and the output signal of the inverter is also kept unchanged; and (7): the difference value is compared with the hysteresis width h1Comparing, if the difference is larger than h1Entering the step (8); if the difference is not more than h1Entering the step (9); and (8): controlling the processing unit to output a positive level signal, controlling the current conditioning unit to output increased current, and entering the step (10); and (9): the control processing unit outputs a negative level signal and controls the current conditioning unit to output reduced current; step (10): calculating a load current harmonic component; step (11): increasing the phase of the harmonic component of the load current by 180 degrees to obtain a compensation current; step (12): the controller controls the harmonic compensation unit to output the compensation current to the alternating current output unit.
In the harmonic suppression method, the step (2) is to convert the load current ia、ib、icAnd converting the abc coordinates to two-phase coordinate points to obtain the active component and the reactive component of the current:
Figure BDA0002251820940000041
ipas a current active component, iqIn order to be a reactive component of the current,
Figure BDA0002251820940000042
ω is the angular frequency.
In the harmonic suppression method, the load current fundamental component calculation formula in the step (3) is as follows:
Figure BDA0002251820940000043
iaffor the fundamental component of the A-phase load current, ibfFor the fundamental component of the B-phase load current, icfIs a C-phase load current fundamental component.
In the harmonic suppression method, the difference value between the load current fundamental component and the current reference value is calculated in step (4)
Figure BDA0002251820940000044
i is the current reference value difference.
In the harmonic suppression method, the calculation formula of the load current harmonic component in the step (10) is as follows:
Figure BDA0002251820940000045
iakfor harmonic components of A-phase load current ibkFor harmonic components of B-phase load current ickIs a C-phase load current harmonic component.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (6)

1. A photovoltaic inverter based on harmonic suppression is characterized by comprising a direct current input unit, an inversion unit, a current conditioning unit, a load current acquisition unit, a control processing unit, a harmonic compensation unit and an alternating current output unit, wherein the direct current input unit is sequentially connected with the inversion unit, the current conditioning unit and the alternating current output unit; the photovoltaic inverter collects the load current, fundamental wave components and harmonic wave components are analyzed and calculated, harmonic wave compensation is further carried out, and the inverter outputs current signals with good sine degree.
2. The harmonic suppression-based photovoltaic inverter as claimed in claim 1, wherein the load current collecting unit collects the load current output by the ac output unit by using a current sensor.
3. The harmonic suppression-based photovoltaic inverter as claimed in claim 2, wherein the inverter unit inverts the dc power input by the dc input unit using a rectifier bridge to output an ac signal.
4. The harmonic suppression-based photovoltaic inverter as claimed in claim 3, wherein the current conditioning unit comprises a current hysteresis PWM current controller, and the hysteresis PWM current controller has a hysteresis width h1、h2，h2Greater than h1And the alternating current signal output by the inversion unit is conditioned to realize the purpose of tracking the given current.
5. The harmonic suppression-based photovoltaic inverter as claimed in claim 4, wherein the harmonic compensation unit performs harmonic compensation on the ac signal output by the inverter unit according to the control signal of the control processing unit.
6. The harmonic suppression method of a harmonic suppression-based photovoltaic inverter according to any one of claims 1 to 5, characterized in that the harmonic suppression method comprises the steps of:
step (1): the load current acquisition unit acquires the load current and outputs the load current to the control processing unit;
step (2): the control processing unit calculates the active component and the reactive component of the current according to the load current:
Figure FDA0002251820930000011
ipfor the active component of the current, iqFor the purpose of the reactive component of the current,
Figure FDA0002251820930000012
omega is the angular frequency, iaIs a phase A load current ibIs a B-phase load current, icIs a C-phase load current;
and (3): calculating the load current fundamental component:
Figure FDA0002251820930000013
iafis the A-phase fundamental component of the load current ibfIs the B-phase fundamental component of the load current icfIs the load current C phase fundamental component;
and (4): calculating a difference between the load current fundamental component and a current reference value
Figure FDA0002251820930000021
i is the current reference value difference;
and (5): comparing said difference with h2Comparing, if the difference is larger than h2Entering the step (6); if the difference is not more than h2Entering the step (7);
and (6): the output signal of the control processing unit is kept unchanged;
and (7): comparing said difference with h1Comparing, if the difference is larger than h1Entering the step (8); if the difference is not more than h1Entering the step (9);
and (8): the control processing unit outputs a positive level signal to control the current conditioning unit to output current to increase, and the step (10) is carried out;
and (9): the control processing unit outputs a negative level signal to control the current conditioning unit to output current to be reduced;
step (10): calculating the difference value between the load current and the load current fundamental component to obtain the load current harmonic component:
Figure FDA0002251820930000022
iakis the A-phase harmonic component of the load current ibkIs said negativeHarmonic component of B phase of current carrying ickIs the load current C phase harmonic component;
step (11): increasing the phase of the harmonic component of the load current by 180 degrees to obtain a compensation current;
step (12): the controller controls the harmonic compensation unit to output the compensation current to the alternating current output unit.
CN201911037124.6A 2019-10-29 2019-10-29 Photovoltaic inverter based on harmonic suppression and harmonic suppression method Pending CN110957754A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911037124.6A CN110957754A (en) 2019-10-29 2019-10-29 Photovoltaic inverter based on harmonic suppression and harmonic suppression method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911037124.6A CN110957754A (en) 2019-10-29 2019-10-29 Photovoltaic inverter based on harmonic suppression and harmonic suppression method

Publications (1)

Publication Number Publication Date
CN110957754A true CN110957754A (en) 2020-04-03

Family

ID=69976475

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911037124.6A Pending CN110957754A (en) 2019-10-29 2019-10-29 Photovoltaic inverter based on harmonic suppression and harmonic suppression method

Country Status (1)

Country Link
CN (1) CN110957754A (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007181253A (en) * 2005-12-27 2007-07-12 Mitsubishi Electric Corp Power converter
CN102074965A (en) * 2011-03-02 2011-05-25 英利能源（中国）有限公司 Device and method for reactive power compensation and harmonic suppression of grid-connected potovoltaic system
CN104218838A (en) * 2014-07-30 2014-12-17 新疆荣信节能电气有限公司 Photovoltaic grid-connected inverter with function of adaptive harmonic in-place control
CN106058931A (en) * 2016-07-11 2016-10-26 太原理工大学 Photovoltaic grid-connected inverter comprising electric energy quality processing, and control method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007181253A (en) * 2005-12-27 2007-07-12 Mitsubishi Electric Corp Power converter
CN102074965A (en) * 2011-03-02 2011-05-25 英利能源（中国）有限公司 Device and method for reactive power compensation and harmonic suppression of grid-connected potovoltaic system
CN104218838A (en) * 2014-07-30 2014-12-17 新疆荣信节能电气有限公司 Photovoltaic grid-connected inverter with function of adaptive harmonic in-place control
CN106058931A (en) * 2016-07-11 2016-10-26 太原理工大学 Photovoltaic grid-connected inverter comprising electric energy quality processing, and control method thereof

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
冬雷: "《DSP原理及电机控制系统应用》", 30 June 2007, 北京航空航天大学出版社 *
肖冬: "《电力电子技术（第3版）》", 31 July 2017, 冶金工业出版社 *

Similar Documents

Publication Publication Date Title
US10715056B2 (en) Three-phase converter with zero-sequence regulation
CN108023352B (en) Power grid high-frequency impedance remodeling device and method for inhibiting distributed generation resonance
CN111162684B (en) Voltage-sensor-free power prediction control method for three-phase voltage type PWM rectifier
CN106849624B (en) Method and system for eliminating three-phase rectification harmonic waves based on repetitive control
CN113612398B (en) Nonlinear control method and system for high-frequency chain matrix converter under power grid distortion working condition
CN104065288A (en) Iteration proportional integral current control method for photovoltaic grid-connected inverter
Ye et al. Shunt active power filter based on proportional integral and multi vector resonant controllers for compensating nonlinear loads
CN102185505A (en) Method and system for controlling three-phase high-power-factor PWM (Pulse-Width Modulation) rectifier
CN110957754A (en) Photovoltaic inverter based on harmonic suppression and harmonic suppression method
US10666159B2 (en) Single-phase converter control method and apparatus
Gao et al. A shunt active power filter with control method based on neural network
CN116979535A (en) Dual harmonic current detection method for active power filter
CN112350595B (en) Analog impedance control method for inhibiting input unbalance influence of AC/DC matrix converter
CN110854858A (en) Compensation method of harmonic compensation device based on current analysis
CN109245104B (en) Dynamic sliding mode control method of active power filter
CN112467776A (en) Current source type converter system, control method and space vector modulation method
Shengqing et al. A harmonic current forecasting method for microgrid hapf based on the emd-svr theory
CN112290816B (en) Integrated circuit for controlling three-level inverter
Fei et al. Adaptive fractional high order sliding mode fuzzy control of active power filter
Maliakova et al. APF control with the use of the direction of the energy flow determination method in the electric circuit with a nonlinear load
CN110957725A (en) Photovoltaic inverter based on harmonic estimation and control method
CN110957755A (en) Photovoltaic power generation inverter control system and method based on current control
Roy et al. Robust backstepping integral terminal sliding mode controller for a grid-tied solar PV unit
CN109756141B (en) Three-phase multi-harmonic current generation method and device
Yanbo et al. Shunt active power filter-SIMULINK simulation and DSP-based hardware realization

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20200403

RJ01 Rejection of invention patent application after publication