CN103124074B - A kind of power quality compound compensation method - Google Patents
A kind of power quality compound compensation method Download PDFInfo
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- CN103124074B CN103124074B CN201310080661.5A CN201310080661A CN103124074B CN 103124074 B CN103124074 B CN 103124074B CN 201310080661 A CN201310080661 A CN 201310080661A CN 103124074 B CN103124074 B CN 103124074B
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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
- Y02E40/30—Reactive power compensation
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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 present invention relates to a kind of power quality compound compensation method, comprise the following steps：The compensating current signal of sampling current electric grid voltage signal, load current signal and compensation device, different instruction current computational methods are selected according to different compensation ways, and the first compensation way is idle and determine subharmonic compensation way；Second compensation way is idle harmonic compensation way, when the first compensation way is selected, first calculate fundamental wave reactive power compensation current component, instruction harmonic current is calculated again, both are added the combined compensation instruction current needed for obtaining the first compensation way, when second compensation way is selected, first obtain fundamental active current component, second combined compensation instruction current of compensation way is obtained after load current is subtracted into fundamental active current component, the composite governance of reactive power harmonic is realized using the present invention, solve the shortcoming of current power quality controlling device unitary function, improve the cost performance of power quality controlling device.
Description
Technical field
The invention belongs to quality of power supply composite governance field, and in particular to a kind of Comprehensive Reactive Power Compensation technology harmonic is administered
The control method of technology.
Background technology
Electric energy is that the fast-developing important substance of social economy ensures that in recent years, each power consumer is wanted to the quality of power supply
More and more higher is sought, the various quality problems to occurring in electric energy application process are increasingly paid attention to.Common power quality problem master
To be produced by various reactive loads, unbalanced load and nonlinear load, these devices can not only be consumed greatly in the process of running
The reactive power of amount, can also produce a large amount of harmonic waves so that line voltage big ups and downs, reduce power network service efficiency, have a strong impact on
Grid supply quality, causes the user being connected on same power network cannot normal work.In order to improve the power network quality of power supply, occur in that
Various harmonics restraints and the device of reactive-load compensation, modern stationary reacance generator STATCOM possess many advantages, have
Continuously adjust, adjustable range is big, fast response time, control accuracy is high, reliable, harmonic content is few, small volume the advantages of, level
It is coupled structure and easily realizes high-voltage large-capacity so that STATCOM obtains power industry circle and widely pays close attention to, simultaneously for
The control research of STATCOM also becomes the focus of domestic and international discussion.
The Current Control Strategy of STATCOM is an important technology of relation equipment performance, and the control method of electric current can make
The output performance and quality for obtaining STATCOM are different.
The class of existing power quality treatment method one be applied on the devices such as SVC, STATCOM for compensation network
Reactive power；It is another kind of be applied on the devices such as APF for compensation network harmonic wave, both applications are at present using wider
It is general, there is very big advantage in terms of reactive power compensation harmonic improvement, but the compensation function of both applications is more single, and it is right
In needing, the occasion cost performance for carrying out various compensation ways is not high.
Prior art is applied to power quality controlling, has the following disadvantages：
Unitary function, it is impossible to meet the diversified demand of compensation way, system engineering cost is high, and floor space is wide.
The content of the invention
Goal of the invention of the invention is to provide a kind of power quality compound compensation method, and the method can overcome existing electric energy
The defect of quality controlling technology unification, when power quality controlling is carried out, it is not necessary to be equipped with various compensation devices, can basis
Need to carry out optimization compensation to power network, can effectively solve the problem that the problem that equipment investment is big, floor space is wide.
To realize above goal of the invention, the scheme taken is：A kind of power quality compound compensation method, including following step
Suddenly：
1) compensating current signal of sampling current electric grid voltage signal, load current signal and compensation device；
2) different instruction current computational methods are selected according to different compensation ways, the first compensation way is idle
With determine subharmonic compensation way；Second compensation way is idle harmonic compensation way, when the first compensation way is selected,
The synchronous angular frequency of mains voltage signal is extracted using phaselocked loop, using synchronous angular frequency wt to step 1）In load current enter
Row dq is converted, and is obtained exchange active current and is exchanged reactive current component, exchange reactive current component by low pass filtered
Ripple device, obtains fundamental wave reactive power compensation current component；
3) dq conversion is carried out to load current using n frequency multiplication nwt of synchronous angular frequency and obtains overtone order for n=3k+1
D axles component and q axle components, by d axles component and q axles component by low pass filter, dq is carried out with the synchronous angular frequency of nwt anti-
Conversion, obtains the compensation electric current that overtone order is n=3k+1；Negative n frequency multiplication-nwt using synchronous angular frequency enters to load current
Row dq conversion obtains the d axles component and q axle components that overtone order is n=3k-1, and d axles component and q axles component are passed through into LPF
After device, dq inverse transformations are carried out with the synchronous angular frequency of-nwt, obtain the compensation electric current that overtone order is n=3k-1；
4) by step 2）In fundamental wave reactive power compensation electric current and step 3）In overtone order for n=3k-1 compensation electric current
It is added, the combined compensation instruction current needed for obtaining the first compensation way；
5) when second compensation way is selected, the synchronous angular frequency of the mains voltage signal obtained using phaselocked loop is right
The load current for sampling carries out dq conversion, obtains d axles active current and q axle reactive current components, by d axle active components
Fundamental active current component is obtained by low pass filter；
6) load current is subtracted into step 5）In fundamental active current component after obtain the compound of second compensation way
Compensating instruction electric current.
As shown in figure 1, present invention is mainly applied in STATCOM device, the main power circuit of the device is by three-phase or list
Mutually topological converter plant, series inductance and control circuit are constituted.The three-phase output of the converter plant is by inductance incoming transport electricity
A, B, C three-phase in source.Converter plant part is inverter structure, and the part can be chain structure or three-phase bridge based on H bridges
Formula structure, DSP control circuits are used for instruction current calculating, pwm pulse triggering and the control of converter plant DC bus-bar voltage.
Beneficial effect of the present invention：The present invention realizes the composite governance of reactive power harmonic, solves current electric energy matter
The shortcoming of controlling device unitary function is measured, the cost performance of power quality controlling device is improve.
Brief description of the drawings
Fig. 1, quality of power supply combined compensation schematic device.
Specific embodiment
A kind of power quality compound compensation method, comprises the following steps：
1) compensating current signal of sampling current electric grid voltage signal, load current signal and compensation device；
2) different instruction current computational methods are selected according to different compensation way, the first compensation way for idle and
Determine subharmonic compensation way；Second compensation way is idle harmonic compensation way, when the first compensation way is selected, profit
The synchronous angular frequency of mains voltage signal is extracted with phaselocked loop, using synchronous angular frequency wt to step 1）In load current carry out
Dq is converted, and is obtained exchange active current and is exchanged reactive current component, exchange reactive current component by LPF
Device, obtains fundamental wave reactive power compensation current component；
3) dq conversion is carried out to load current using n frequency multiplication nwt of synchronous angular frequency and obtains overtone order for n=3k+1
D axles component and q axle components, by d axles component and q axles component by low pass filter, dq is carried out with the synchronous angular frequency of nwt anti-
Conversion, obtains the compensation electric current that overtone order is n=3k+1；Negative n frequency multiplication-nwt using synchronous angular frequency enters to load current
Row dq conversion obtains the d axles component and q axle components that overtone order is n=3k-1, and d axles component and q axles component are passed through into LPF
After device, dq inverse transformations are carried out with the synchronous angular frequency of-nwt, obtain the compensation electric current that overtone order is n=3k-1；
4) by step 2）In fundamental wave reactive power compensation electric current and step 3）In overtone order for n=3k-1 compensation electric current
It is added, the combined compensation instruction current needed for obtaining the first compensation way；
5) when second compensation way is selected, the synchronous angular frequency of the mains voltage signal obtained using phaselocked loop is right
The load current for sampling carries out dq conversion, obtains d axles active current and q axle reactive current components, by d axle active components
Fundamental active current component is obtained by low pass filter；
6) load current is subtracted into step 5）In fundamental active current component after obtain the compound of second compensation way
Compensating instruction electric current.
Claims (1)
1. a kind of power quality compound compensation method, comprises the following steps：
The compensating current signal of step one, sampling current electric grid voltage signal, load current signal and compensation device；
Step 2, different instruction current computational methods are selected according to different compensation way, the first compensation way is idle
With determine subharmonic compensation way；Second compensation way is idle harmonic compensation way, when the first compensation way is selected,
The synchronous angular frequency of mains voltage signal is extracted using phaselocked loop, the load current in step one is entered using synchronous angular frequency wt
Row dq is converted, and is obtained exchange active current and is exchanged reactive current component, exchange reactive current component by low pass filtered
Ripple device, obtains fundamental wave reactive power compensation current component；
Step 3, dq conversion is carried out to load current using n frequency multiplication nwt of synchronous angular frequency obtain overtone order for n=3k+1
D axles component and q axle components, by d axles component and q axles component by low pass filter, dq is carried out with the synchronous angular frequency of nwt anti-
Conversion, obtains the compensation electric current that overtone order is n=3k+1；Negative n frequency multiplication-nwt using synchronous angular frequency enters to load current
Row dq conversion obtains the d axles component and q axle components that overtone order is n=3k-1, and d axles component and q axles component are passed through into LPF
After device, dq inverse transformations are carried out with the synchronous angular frequency of-nwt, obtain the compensation electric current that overtone order is n=3k-1；
Step 4, the compensation electric current that the overtone order compensated the fundamental wave reactive power in step 2 in electric current and step 3 is n=3k-1
It is added, the combined compensation instruction current needed for obtaining the first compensation way；
Step 5, when select second compensation way when, the synchronous angular frequency of the mains voltage signal obtained using phaselocked loop is right
The load current for sampling carries out dq conversion, obtains d axles active current and q axle reactive current components, by d axle active components
Fundamental active current component is obtained by low pass filter；
The compound of second compensation way is obtained after step 6, the fundamental active current component for subtracting load current in step 5
Compensating instruction electric current.
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| CN201310080661.5A CN103124074B (en) | 2013-03-14 | 2013-03-14 | A kind of power quality compound compensation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109617087B (en) * | 2018-11-27 | 2022-09-06 | 中电普瑞科技有限公司 | Reactive and harmonic self-adaptive compensation method and system |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109406854B (en) * | 2018-10-24 | 2021-07-06 | 广东工业大学 | Harmonic instruction current obtaining method, device and equipment of single-phase active filter |
| CN110137975A (en) * | 2019-05-24 | 2019-08-16 | 河北德瑞特电器有限公司 | New electric energy quality controller and its control method based on current source inverter |
| CN110854858A (en) * | 2019-10-29 | 2020-02-28 | 国网江苏省电力有限公司盐城供电分公司 | Compensation method of harmonic compensation device based on current analysis |
| CN113964837B (en) * | 2021-10-09 | 2023-12-12 | 北京南瑞数字技术有限公司 | Composite control method and system suitable for LCL type parallel active power filter |
| CN118336748B (en) * | 2024-06-13 | 2024-08-13 | 法拉迪电气有限公司 | Reactive power compensation optimization control method, equipment and medium for new energy grid connection |
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| CN201966616U (en) * | 2010-12-17 | 2011-09-07 | 神华集团有限责任公司 | Filter circuit and power filter employing same |
| CN102290815A (en) * | 2011-08-22 | 2011-12-21 | 湖北三环发展股份有限公司 | APF (active power filter) based on coupling inductance |
| CN102570476A (en) * | 2011-12-31 | 2012-07-11 | 浙江大学 | Repetitive-control-based method for controlling compensation current of DSTATCOM (Distribution Static Synchronous Compensator) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2828863B2 (en) * | 1993-03-09 | 1998-11-25 | 財団法人鉄道総合技術研究所 | Unbalance compensator for 3-phase / 2-phase converter |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201966616U (en) * | 2010-12-17 | 2011-09-07 | 神华集团有限责任公司 | Filter circuit and power filter employing same |
| CN102290815A (en) * | 2011-08-22 | 2011-12-21 | 湖北三环发展股份有限公司 | APF (active power filter) based on coupling inductance |
| CN102570476A (en) * | 2011-12-31 | 2012-07-11 | 浙江大学 | Repetitive-control-based method for controlling compensation current of DSTATCOM (Distribution Static Synchronous Compensator) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109617087B (en) * | 2018-11-27 | 2022-09-06 | 中电普瑞科技有限公司 | Reactive and harmonic self-adaptive compensation method and system |
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