CN110854858A - Compensation method of harmonic compensation device based on current analysis - Google Patents
Compensation method of harmonic compensation device based on current analysis Download PDFInfo
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- CN110854858A CN110854858A CN201911037805.2A CN201911037805A CN110854858A CN 110854858 A CN110854858 A CN 110854858A CN 201911037805 A CN201911037805 A CN 201911037805A CN 110854858 A CN110854858 A CN 110854858A
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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
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- 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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Abstract
The invention provides a compensation method of a harmonic compensation device based on current analysis, which comprises the following steps: step (1): collecting load current; step (2): the controller calculates the active component and the reactive component of the current according to the load current; and (3): calculating the load current fundamental component; and (4): calculating the difference value of the load current and the load current fundamental component to obtain the load current harmonic component; and (5): increasing the phase of the harmonic component of the load current by 180 degrees to obtain a compensation current; and (6): the controller sends a driving signal to the driving unit; and (7): generating a compensation current; and (8): the output unit outputs the compensation current to the load. The invention provides a compensation method of a harmonic compensation device based on current analysis, which has small calculation amount, can detect and track changes in real time and better perform harmonic compensation.
Description
Technical Field
The invention belongs to the technical field of power detection, and particularly relates to a compensation method of a harmonic compensation device based on current analysis.
Background
With the increasing energy crisis and environmental pollution, photovoltaic power generation and related research thereof have gained unprecedented attention. With the continuous development of electronic products, many nonlinear loads appear in the production and life of people, and then the waveform of the voltage at the output end of the photovoltaic inverter is seriously deformed or even not sine wave, which brings harmonic pollution to the power grid to a certain extent, and further causes the abnormal work or even accidents of partial equipment. Therefore, effective harmonic compensation is required for the power grid to improve the quality of power supply and distribution of the power grid.
The invention provides a compensation method of a harmonic compensation device based on current analysis, which is characterized in that harmonic components are calculated according to load current analysis, a waveform with the same phase difference of 180 degrees with the detected harmonic current is generated for harmonic compensation, and compensation current can be rapidly, real-timely and accurately output.
Disclosure of Invention
The invention provides a compensation method of a harmonic compensation device based on current analysis, which has small calculation amount, can detect and track changes in real time and better perform harmonic compensation.
The invention specifically relates to a compensation method of a harmonic compensation device based on current analysis, which comprises the following steps:
step (1): collecting load current;
step (2): the controller calculates the active component and the reactive component of the current according to the load current:ipfor the active component of the current, iqFor the purpose of the reactive component of the current,
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:
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 the difference value between the load current and the load current fundamental component to obtain the load current harmonic component:
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;
and (5): increasing the phase of the harmonic component of the load current by 180 degrees to obtain a compensation current;
and (6): the controller sends a driving signal to the driving unit;
and (7): the driving unit generates a compensation current;
and (8): the output unit outputs the compensation current to the load.
The load current is collected by a current sensor.
And the controller adopts a microcontroller to analyze and calculate the load current, and the compensation current is obtained through the steps (1) to (5) of the compensation method.
The driving unit adopts an IGBT special integrated driving chip to drive the power device IGBT, and can simultaneously control the on and off of 6 power device IGBTs.
Compared with the prior art, the beneficial effects are: the compensation method collects the load current, analyzes and calculates harmonic components to obtain the compensation current, and then sends a control instruction to the driving unit to output the compensation current; the compensation method is small in calculation amount, can detect and track harmonic changes in real time, and can perform harmonic compensation better.
Drawings
Fig. 1 is a flowchart illustrating a compensation method of a harmonic compensation apparatus based on current analysis according to the present invention.
Detailed Description
The following describes in detail a specific embodiment of a compensation method of a harmonic compensation apparatus based on current analysis according to the present invention with reference to the accompanying drawings.
As shown in fig. 1, the compensation method of the harmonic compensation device based on current analysis of the present invention includes the following steps: step (1): collecting load current; step (2): calculating the active component and the reactive component of the current; and (3): calculating a load current fundamental component; and (4): calculating a difference value of the load current and a load current fundamental component to obtain a load current harmonic component; and (5): increasing the phase of the harmonic component of the load current by 180 degrees to obtain a compensation current; and (6): the controller sends a driving signal to the driving unit; and (7): the driving unit drives the converter to generate a current signal subjected to harmonic compensation; and (8): the output unit outputs a current signal current to the load.
The harmonic compensation device adopts a current sensor to collect load current, and carries out harmonic compensation calculation on the basis of the current: analyzing and calculating the load current by adopting a microcontroller, and obtaining the compensation current through the steps (1) to (5):
in the step (2), three-phase 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:
ipas a real component of load current iqIs a reactive component of the load current,
ω is the angular frequency.
The load current fundamental component calculation formula in the step (3) is as follows:
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.
The load current harmonic component calculation formula in the step (4) is as follows:iakfor harmonic components of A-phase load current ibkFor harmonic components of B-phase load current ickIs a C-phase load current harmonic component.
The driving unit adopts an IGBT special integrated driving chip to drive the power device IGBT, and can simultaneously control the on and off of 6 power device IGBTs.
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 (4)
1. A compensation method of a harmonic compensation device based on current analysis is characterized by comprising the following steps:
step (1): collecting load current;
step (2): the controller calculates the active component and the reactive component of the current according to the load current:
ipis the active component of said current，iqFor the purpose of the reactive component of the current,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:
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 the difference value between the load current and the load current fundamental component to obtain the load current harmonic component:
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;
and (5): increasing the phase of the harmonic component of the load current by 180 degrees to obtain a compensation current;
and (6): the controller sends a driving signal to the driving unit;
and (7): the driving unit generates a compensation current;
and (8): the output unit outputs the compensation current to the load.
2. The compensation method of the harmonic compensation device based on current analysis according to claim 1, wherein the load current is collected by a current sensor.
3. The compensation method of the harmonic compensation device based on current analysis according to claim 1, wherein the controller uses a microcontroller to analyze and calculate the load current, and the compensation current is obtained through steps (1) to (5) of the compensation method.
4. The compensation method of the current analysis-based harmonic compensation device according to claim 1, wherein the driving unit drives the power devices IGBT by using an IGBT-specific integrated driving chip, and can simultaneously control on and off of 6 power devices IGBT.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113311201A (en) * | 2021-04-08 | 2021-08-27 | 深圳市鼎阳科技股份有限公司 | Calibration method for signal generator and storage medium |
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| CN103124074A (en) * | 2013-03-14 | 2013-05-29 | 威凡智能电气高科技有限公司 | Power quality compound compensation method |
| 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 |
| CN107732915A (en) * | 2017-10-24 | 2018-02-23 | 江苏大学 | A kind of simplify control method of parallel connection type active electric filter |
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2019
- 2019-10-29 CN CN201911037805.2A patent/CN110854858A/en active Pending
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| CN102163843A (en) * | 2010-02-19 | 2011-08-24 | Abb研究有限公司 | Control method for single-phase grid-connected LCL inverter |
| CN103124074A (en) * | 2013-03-14 | 2013-05-29 | 威凡智能电气高科技有限公司 | Power quality compound compensation method |
| 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 |
| CN107732915A (en) * | 2017-10-24 | 2018-02-23 | 江苏大学 | A kind of simplify control method of parallel connection type active electric filter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113311201A (en) * | 2021-04-08 | 2021-08-27 | 深圳市鼎阳科技股份有限公司 | Calibration method for signal generator and storage medium |
| CN113311201B (en) * | 2021-04-08 | 2022-04-19 | 深圳市鼎阳科技股份有限公司 | Calibration method for signal generator and storage medium |
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