CN102255315A - Three-phase current balance adjustment system of electric energy adjusting and electricity saving device - Google Patents
Three-phase current balance adjustment system of electric energy adjusting and electricity saving device Download PDFInfo
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- CN102255315A CN102255315A CN2010101740202A CN201010174020A CN102255315A CN 102255315 A CN102255315 A CN 102255315A CN 2010101740202 A CN2010101740202 A CN 2010101740202A CN 201010174020 A CN201010174020 A CN 201010174020A CN 102255315 A CN102255315 A CN 102255315A
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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
Abstract
The invention relates to a three-phase current balance adjustment system of an electric energy adjusting and electricity saving device, wherein the system comprises a main circuit and a control system; a three-phase full-bridge inverter structure is adopted for the main circuit, and a direct current side is provided with a capacitor; and the control system consists of two parts, namely a harmonic wave signal detection system and a compensation current or voltage system. According to the invention, favorable compensation can be realized for the three-phase unbalance system, and compensation is implemented for unbalance active current.
Description
(1) technical field
The present invention relates to a kind of electric energy and regulate battery saving arrangement three-phase balance regulating system.Be widely used in low pressure three-phase four-wire system city domestic power grid, part industrial electrical network and the agricultural power network, be particularly suitable for improving because the power quality problem that harmonic wave and three-phase load imbalance cause.Belong to electric and electronic technical field.
(2) background technology
The low voltage electric network three-phase load may cause imbalance because of multiple reason, and even the degree of balance is very not serious.The three-phase load imbalance all works the mischief to low voltage electric network, distribution transformer, 6～10kV high-tension line, influences bigger to power supply enterprise's safe power supply reduction line loss, user security electricity consumption.
Three-phase imbalance is meant and contains negative phase-sequence and zero-sequence component in voltage in three phases or the electric current, phenomenon such as cause the effective value of three-phase voltage or electric current to differ in size, phase place no longer is mutual deviation 120 degree, neutral line current is excessive.The harm that unbalanced three-phase voltage or electric current can cause mainly contains:
(1) causes the additional heating and the vibration of electric rotating machine, endanger its safe operation and normal output;
(2) cause with the negative sequence component to be the kinds of protect misoperation that starts original paper, electric power netting safe running is caused serious threat;
(3) reduce the power system capacity utilance, increase the grid loss, reduce the electrical network energy transmission efficiency;
(4) unbalanced three-phase load will make transformer shorten the life-span because certain is mutually overheated, add lossy;
(5) center line is generally thinner in the power distribution network, and current in middle wire was very big when three-phase load was uneven, and the center line heating is serious, but fire hazard, even center line is blown.
Conventional compensation way in the distribution system has at present:
1) three-phase capacitor compensation way
This compensation way control method is simple, can only be applied in the three-phase load system in a basic balance, for three-phase unbalance system, therefore can not realize good compensation because each phase reactive power is different.
2) single-phase electricity container phase splitting compensation mode
Take idle big mutually electric capacity of throwing, the idle little compensation way that electric capacity is not even thrown in throwing that lacks mutually more.Its result can make each mutually idle being compensated of three-phase unbalance system, and is helpless for unbalanced active current.
3) cross-over connection resistance, electric capacity or inductance between phase line and phase line
Resistance has the idle ability of transfer between phase line and phase line, and electric capacity or inductance have the meritorious ability of transfer between phase line and phase line.
(3) summary of the invention
Purpose of the present invention overcomes above-mentioned deficiency, provide a kind of for three-phase unbalance system can realize good compensation, the electric energy that is compensated for unbalanced active current regulates battery saving arrangement three-phase balance regulating system.
The object of the present invention is achieved like this: a kind of electric energy is regulated battery saving arrangement three-phase balance regulating system, described system comprises main circuit and control system, described main circuit adopts the three-phase full-bridge inverter structure, DC side is a capacitor, this structure can be eliminated the harmonic current of zero-sequence component, realizes asymmetric control; Described control system is made up of two parts, and the one, harmonic signal detection system, the 2nd, offset current or electrical voltage system.The harmonic signal detection system is used for the detection to harmonic signal, and offset current or electrical voltage system are to produce the corresponding compensation curtage according to detected harmonic signal, and the harmonic detecting method based on the instantaneous reactive theory is adopted in the detection of described harmonic signal.
Instantaneous space vector method based on instantaneous reactive power theory is a kind of detection method most widely used among the present FACTS, is proposed in 1984 by Japanese scholar H. Akagi the earliest, through updating, mainly comprises now
,
Method and
,
Method.Wherein,
,
Method is applicable to the detection of harmonic current under line voltage symmetry and the undistorted situation;
,
Method not only is suitable for when line voltage distorts, and is effective too when line voltage is asymmetric.
The present invention has following advantage:
1, handle up fast idle
This device can absorb or the release reactive power on fast stepless difference ground continuously, and be a few tens of milliseconds operate time, makes that power factor of electric network is 1.Traditional capacitor group switching device can not effectively compensate fast-changing reactive power owing to be subjected to the restriction of discharge time, and capacitor all is grouping switching, so its compensation precision is subjected to differential restriction, and compensation effect is bad.Therefore capacitor can only discharge idlely in addition, can not receive idlely, can not reach the purpose that reduces electric current, reduces line loss in the capacitive load occasion.
2, offset current harmonic wave
This device can compensate 2-31 primary current harmonic wave, makes the power supply cleaning to improve user's the quality of power supply.Owing to adopted the transient current etection theory, can detect and isolate the current harmonics that needs compensation effectively, so just can send instruction timely and accurately, realize the current harmonics compensation.
3, suppress voltage flicker
Line voltage of short duration voltage flicker can occur when running into big load start-stop or running into failure condition, promptly line voltage can fall suddenly, and the duration is very short, has only tens to a hundreds of millisecond.Human eye is difficult to observe the influence that this flickering brings electricity consumption, but the precision equipment of some Precision Machining enterprise but is impatient at this voltage flicker, each voltage flicker all may cause producing waste product, even makes the phenomenon that restarting appears in some machine.This device action time is tens milliseconds, therefore can suppress the flickering of line voltage effectively.
4, realize balanced feeding
The power distribution network load is very complicated, and three-phase load all is separate, so three phase supply often all is unbalanced.Certain overload of powering mutually might appear under serious situation, the relaying protection of circuit or transformer or overcurrent protection action, thus make whole three-phase trip simultaneously, influence other two-phases user's electricity consumption.This device can be realized the electric energy exchange between the phase place effectively.Although user's load is not three-phase equilibrium, this device can absorb the electric energy that the transformer three-phase is brought, and exchanges and distribute to every user mutually again and use, and what make that transformer sends is balanced power.
5, compensation zero-sequence current
Because this device has adopted the three-phase four-wire system structure, so it can compensate zero-sequence current, raising user's quality of voltage.
(4) description of drawings
Fig. 1 be of the present invention based on
,
The schematic diagram of the harmonic detecting method principle input of compute mode.
Fig. 2 be of the present invention based on
,
The harmonic detecting method schematic diagram of compute mode.
Fig. 3 is a three-phase four-wire system APFV system configuration schematic diagram of the present invention.
(5) embodiment
Referring to Fig. 1, Fig. 2 and Fig. 3, Fig. 1 be of the present invention based on
,
The schematic diagram of the harmonic detecting method principle input of compute mode.Fig. 2 be of the present invention based on
,
The harmonic detecting method schematic diagram of compute mode.Fig. 3 is a three-phase four-wire system APFV system configuration schematic diagram of the present invention.By Fig. 1, Fig. 2 and Fig. 3 as can be seen, electric energy of the present invention is regulated battery saving arrangement three-phase balance regulating system, comprise main circuit and control system, described main circuit adopts the three-phase full-bridge inverter structure, DC side is a capacitor, this structure can be eliminated the harmonic current of zero-sequence component, realizes asymmetric control; Described control system is made up of two parts, and the one, for the detection of harmonic signal, the 2nd, produce the corresponding compensation curtage according to detected harmonic signal, the harmonic detecting method based on the instantaneous reactive theory is adopted in the detection of described harmonic signal.
The generation of offset current:
The production method of offset current commonly used is the control of chain rate that stagnates.The chain rate that stagnates control is that difference with offset current reference value and inverter actual current output valve is input to the comparator with hysteresis characteristic, come the folding of control switch by the output of comparator, thereby reach inverter output valve real-time tracking offset current reference value.Compare with the triangular carrier Linear Control, the chain rate that stagnates control has characteristics such as switching loss is little, dynamic response is fast.Shortcoming is that the tracking accuracy of switching frequency, response speed and the electric current of system can be subjected to stagnate that endless belt is wide influences.During bandwidth fixed, switching frequency can change with offset current, thereby causes bigger pulsating current and switching noise.
The offset current method that this device adopts belongs to the improving one's methods of control of chain rate that stagnate, be that difference passing ratio integral element with offset current reference value and inverter actual current output valve obtains the control corresponding amount and outputs in the pulse generator, make inverter output valve real-time tracking offset current reference value.
In sum, the scheme that this APFV system configuration is adopted is a three-phase four-wire system, AC side adopts the 3-phase power converter group, DC side adopts the synchronous compensator plant of electric capacity, this device inserts by between the bucking-out system by transformers connected in parallel, to reach the purpose that load current harmonic wave and reactive current are compensated.The harmonic wave detection link of control system is the harmonic detecting method based on instantaneous power theory, and the producing method of offset current is based on stagnant chain rate control method.
Claims (1)
1. an electric energy is regulated battery saving arrangement three-phase balance regulating system, it is characterized in that described system comprises main circuit and control system, and described main circuit adopts the three-phase full-bridge inverter structure, and DC side is a capacitor; Described control system is made up of two parts, and the one, harmonic signal detection system, the 2nd, offset current or electrical voltage system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101740202A CN102255315A (en) | 2010-05-17 | 2010-05-17 | Three-phase current balance adjustment system of electric energy adjusting and electricity saving device |
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| CN2010101740202A CN102255315A (en) | 2010-05-17 | 2010-05-17 | Three-phase current balance adjustment system of electric energy adjusting and electricity saving device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441507A (en) * | 2013-07-08 | 2013-12-11 | 湖南工业大学 | Control method of cascade STATCOM on unbalanced working condition |
| CN103730898A (en) * | 2013-12-03 | 2014-04-16 | 南方电网科学研究院有限责任公司 | Method for additional function control for modularized multilevel current converter |
| CN104135209A (en) * | 2014-08-15 | 2014-11-05 | 浙江绿达能源科技有限公司 | Intelligent electricity saving system for three-phase asynchronous motor |
| CN105140923A (en) * | 2015-09-15 | 2015-12-09 | 深圳市海思瑞科电气技术有限公司 | Active filtering method and filter |
-
2010
- 2010-05-17 CN CN2010101740202A patent/CN102255315A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441507A (en) * | 2013-07-08 | 2013-12-11 | 湖南工业大学 | Control method of cascade STATCOM on unbalanced working condition |
| CN103730898A (en) * | 2013-12-03 | 2014-04-16 | 南方电网科学研究院有限责任公司 | Method for additional function control for modularized multilevel current converter |
| CN104135209A (en) * | 2014-08-15 | 2014-11-05 | 浙江绿达能源科技有限公司 | Intelligent electricity saving system for three-phase asynchronous motor |
| CN105140923A (en) * | 2015-09-15 | 2015-12-09 | 深圳市海思瑞科电气技术有限公司 | Active filtering method and filter |
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Application publication date: 20111123 |