CN1945918A - Method and device for treating electric grid harmonic wave - Google Patents
Method and device for treating electric grid harmonic wave Download PDFInfo
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- CN1945918A CN1945918A CNA2006100966953A CN200610096695A CN1945918A CN 1945918 A CN1945918 A CN 1945918A CN A2006100966953 A CNA2006100966953 A CN A2006100966953A CN 200610096695 A CN200610096695 A CN 200610096695A CN 1945918 A CN1945918 A CN 1945918A
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Abstract
This invention discloses a method and a device for treating power net harmonics characterizing in utilizing a harmonic signal transmitter to separate sum of harmonic three-phase voltage or current signals to set that a harmonic transmitter secondary circuit formed by the controllable impedance at the secondary side of the transmitter costs harmonic energy, or inverses harmonic signals at the secondary side of the transmitter then feeds back the inverse signal to the system via the harmonic transmitter first side to cancel the harmonic volume of the system.
Description
Technical field:
The present invention relates to administer the method and the harmonic wave control equipment of mains by harmonics.
Background technology:
The harmonic load electric current is produced by nonlinear-load.Comprise switched-mode power supply, electronic fluorescent lamp ballast, the transmission device of speed governing, uninterrupted power supply, Armco magnetic iron center device, frequency conversion equipment, arc furnace etc.On the one hand, along with expanding economy, produce the device type and the quantity sharp increase of harmonic wave; On the other hand, along with being the popularization and application of the sensitive equipment of representative with the computer, more and more higher for the power supply quality requirement of utility network, harmonic standard has separately been formulated in many countries and regions, in order to the harmonic pollution of restriction electric power system and power consumption equipment.
The harmfulness of AC harmonic is very big, mainly contains: (1) produces interference to the thyristor units of contiguous weak electricity system and parallel running; (2) allowable load of generator is reduced; (3) make that noise of transformer increases, power loss increases; (4) capacitor of incoming transport system is transshipped; (5) cause the additional heating of electrical equipment; (6) harmonic wave can make neutral line overload in the three-phase and four-line circuit; (7) make the change of induction motor rotating speed generating period, and its power loss (iron loss, copper loss) is increased; (8) make the degraded accuracy of instrument transformer; (9) influence the work of electronic computer; (10) harm cable life acceleration cable is aging.
Improvement for harmonic wave at present comprises:
1, dynamic reactive compensation device is set, to improve the ability that electric power system is born harmonic wave
Under the feasible condition of technical economic analysis, can dynamic reactive compensation device be set at the harmonic source place, comprise static passive compensation device (SVC-Static Var Compensator) or more advanced static synchronous compensator plant (STATCOM StaticSynchronous Compensator), to obtain the quick reactive requirement that changes of compensation load, improve power factor, filtering appts harmonic wave, to reduce to system and inject harmonic current, stablize busbar voltage, reduce imbalance of three-phase voltage degree etc., the ability that the raising electric power system is born harmonic wave.
2, passive filtration unit is set, so that the filtering harmonic wave
Adopt passive component, comprise the tuning filtering device that capacitor, reactor and resistor are formed, the filtering harmonic wave alleviates the harm of harmonic wave to electric equipment.
3, adopt the active filter harmonic carcellation
Utilization can be turn-offed the harmonic component equal and opposite in direction in power electronic device generation and the load current, and the electric current that phase place is opposite comes harmonic carcellation.
Above-mentioned each class methods all have certain effect for harmonic carcellation, but device therefor involves great expense, and are millions of easily even several ten million, and the general user is difficult to bear.
Summary of the invention
The present invention is for avoiding above-mentioned existing in prior technology problem, a kind of power network harmonic wave management method and equipment are provided, and its method is reliable, equipment simple, be easy to make, operation maintenance is simple and convenient, cost is low.
The technical scheme that technical solution problem of the present invention is adopted is:
The characteristics of power network harmonic wave management method of the present invention are to utilize the harmonic signal transmitter to isolate harmonic wave three-phase voltage or three-phase current signal sum from system, the harmonic wave transmitter secondary side loop that forms with the controllable impedance that is arranged on harmonic signal transmitter secondary side consumes harmonic energy, or at harmonic wave transmitter secondary side harmonic signal is carried out anti-phasely, again inversion signal is fed back to bucking-out system harmonic content in the system through harmonic wave transmitter primary side.
The design feature of power network harmonic wave management equipment of the present invention is that humorous wave transformer is set, the Y-shaped connection of the three phases winding at primary side of described humorous wave transformer, the three phases winding at primary side neutral ground that Y shape connects, each corresponding phase line in the other end difference connecting system of each winding; Described harmonic wave Circuit Fault on Secondary Transformer three phase windings are end to end and series connection is formed for separating the secondary side loop of harmonic wave three-phase voltage sum, in described secondary side loop or series connection insert controllable impedance, form the harmonic wave transmitter secondary side loop that consumes harmonic energy; Or series connection inserts the harmonic current negative circuit, formation harmonic signal feedback loop.In this version, described controllable impedance is a resistance; Or be that resistance first-harmonic filter circuit and controllable resistor are composed in series; Resistance first-harmonic filter circuit is the each harmonic resonance branch road that multiple branch circuit was arranged in parallel and selected conducting, or leads to the high pass filter of harmonic wave for the resistance first-harmonic.
The design feature of power network harmonic wave management equipment of the present invention also can be that the harmonic wave current transformer is set, described harmonic wave current transformer, primary side seals in the system, described harmonic wave current transformer secondary side three phase windings parallel connection or series connection setting are formed for separating the secondary side loop of harmonic wave three-phase current sum, in described secondary side loop or middle series connection insert controllable impedance, form the harmonic wave transmitter secondary side loop that consumes harmonic energy; Or series connection inserts harmonic wave pressure negative circuit, formation harmonic signal feedback loop.In this version, controllable impedance is a controllable resistor.
The present invention is to serve as zero with fundamental frequency three-phase voltage or three-phase current sum, and the non-vanishing characteristic of harmonic wave three-phase voltage or three-phase current sum is implemented harmonic wave control, harmonic wave is separated from system, more isolated harmonic content is consumed by controllable impedance or harmonic content in the system is offset by negative feedback.
In the clean electric power system of ideal, electric current and voltage all are pure sine waves.In fact, when electric current flows through with the not linear load of institute making alive, just form non-sinusoidal current, switched-mode power supply, the electronic fluorescent lamp ballast, the transmission device of speed governing, uninterrupted power supply, Armco magnetic iron center device, frequency conversion equipment, arc furnace etc. produce a large amount of harmonic wave harm systems.It is 3 integral multiples (3N, N are natural number) of fundamental frequency that harmonic wave has Zero-pharse harmonic, that is:
3,6,9,12,15,18,21,24,27,30, or the like.
Positive sequence harmonic is that 3 integral multiples of fundamental frequency add 1 (3N+1), that is:
4,7,10,13,16,19,22,25,28,29, or the like.
The negative phase-sequence harmonic wave is that 3 integral multiples of fundamental frequency add 2 (3N+1), that is:
5,8,11,14,17,20,23,26,29,32, or the like.
Different equipment produces different harmonic waves, does not influence fundamental frequency three symmetrical non-linear equipments and mainly produces odd harmonic, as frequency conversion equipment etc., influence the symmetrical non-linear equipments generation even-order harmonic of fundamental frequency three, as arc furnace.
When system is subjected to a certain excitation, as the conducting of thyristor or the variation of arc furnace arc fired state, the three-phase voltage value equates at all because of conducting and arc fired state change constantly, so the energizing quantity in three-phase is asymmetric often, the store energy of this excitation its generation later is on system's direct-to-ground capacitance, stopping its energy constantly in this excitation is stored on the electric capacity with the situation of electric charge, electric charge is evenly distributed at three-phase ground capacitance at once, and electric charge after the distribution and phase voltage stack form each phase-to-ground voltage.
Low-voltage power supply system for neutral ground, electric charge on every electric capacity relatively is by the Transformer Winding formation loop of its direct-to-ground capacitance, circuit, the earth, this phase, oscillatory extinction, three-phase surge damping circuit parameter is basic identical, so three-phase oscillatory extinction process is consistent; Low-voltage power supply system static compensation electric capacity is the most general, system's direct-to-ground capacitance very big (a single-phase domestic air conditioning just has 30 microfarads with electric capacity), a low-voltage power supply system direct-to-ground capacitance reaches thousands of microfarads and even several thousand microfarads, capacitive reactance is very little under harmonic wave has only several ohm of zero points, again owing to circuit, Transformer Winding inductance value very little (several milihenry), and the resistance of the earth all can be ignored again, the oscillatory extinction current amplitude is very big, Here it is why the electric current on the neutral line greater than the reason of phase current.
For isolated neutral system, because each winding of system all is a delta connection, electric charge on the three-phase ground capacitance can't oscillatory extinction, must pass through voltage transformer, the insulation against ground resistance of cable constitutes the oscillation circuit decay, voltage transformer is induction reactance several ten thousand ohm of Gao Keda more under harmonic wave, the very big mega-ohms of cable insulation against ground resistance, system's direct-to-ground capacitance very little generally about 10 microfarads (static compensation electric capacity neutral point is earth-free), the current amplitude of oscillatory extinction very little (below 1 ampere), so oscillatory extinction speed is very slow, but three-phase oscillatory extinction loop parameter is basic identical, so three-phase oscillatory extinction process also is consistent; Can cause the voltage transformer ferro resonance by the voltage transformer oscillatory extinction, bring serious harm to system safety; The speed of oscillatory extinction is slow, and (encouraging and the decay balance after reaching a certain equilibrium valve) constantly gathered in harmonic excitation, so harmonic wave is bigger to isolated neutral system harm, and be bigger to the quality influence of voltage.
Though the harmonic current of low-voltage power supply system is very big but harmonic voltage is very little; The harmonic voltage of medium voltage network is very high but harmonic current is very little, so the power of harmonic wave is not very big, generally at several～100 kilovars.
Draw to draw a conclusion from last surface analysis:
1, harmonic excitation amount is asymmetric often, and three phase harmonic energizing quantity Eja, Ejb, Ejc are unequal, and three phase harmonic energizing quantity electric current I ja, Ijb, Ijc are not unequal yet, and the three-phase symmetrical drive is very rare.
2, three-phase oscillatory extinction process is consistent, and three phase harmonic evanescent voltage amount Usa, Usb, Usc equate that three phase harmonic decay current amount Isa, Isb, Isc equate.
3, the power of harmonic wave is very little, several～tens kilovars.
Compared with the prior art, beneficial effect of the present invention is embodied in:
The inventive method is reliable, device structure is simple, and operation maintenance is convenient, is the part and even 1/tens of other harmonic wave management method investments.
Description of drawings:
Fig. 1 utilizes the inventive method to separate the circuit theory diagrams of harmonic signal from system.
Fig. 2 utilizes the inventive method to separate the different execution mode circuit theory diagrams of harmonic signal from system.
Fig. 3 is the different execution mode circuit theory diagrams of harmonic wave control controllable impedance of the present invention.
Fig. 4 adopts the execution mode schematic diagram of humorous wave transformer for present device
Fig. 5 adopts the different execution mode schematic diagrams of harmonic wave current transformer for present device.
Below, the inventive method and equipment are described further by embodiment:
Embodiment:
The inventive method based on principle be.
Three-phase voltage:
Ua＝Um?sin(ωt)+Eja+Usa
Ub＝Um?sin(ωt-120°)+Ejb+Usb
Uc＝Um?sin(ωt+120°)+Ejc+Usc
Three-phase current:
Ia＝Im?sin(ωt+φ)+Ija+Isa
Ib＝Im?sin(ωt+φ-120°)+Ijb+Isb
Ic＝Im?sin(ωt+φ+120°)+Ijc+Isc
Fundamental frequency three-phase voltage sum is 0:
Um?sin(ωt)+Um?sin(ωt-120°)+Um?sin(ωt+120°)＝0
Fundamental frequency three-phase current sum is 0
Im?sin(ωt+φ)+Im?sin(ωt+φ-120°)+Im?sin(ωt+φ+120°)＝0
The secondary side three-phase voltage of harmonic wave control transformer is respectively:
Una＝K×Ua
Unb＝K×Ub
Unc＝K×Uc
K is a no-load voltage ratio
Secondary side three-phase voltage sum
UΔ＝Una+Unb+Unc＝K×(Eja+Ejb+Ejc+Usa+Usb+Usc)
Therefore harmonic excitation amount, attenuation all reflect at the two ends that the secondary side winding of humorous wave transformer is connected, its circuit theory diagrams such as Fig. 1, the primary side connecting system of humorous wave transformer XBYQ, secondary side three-phase windings in series promptly forms the three-phase voltage sum, isolates the voltage of harmonic wave from system.
Three-phase oscillatory extinction process is consistent, three phase harmonic evanescent voltage amount, decay current amount Isa, Isb, Isc equate, the harmonic wave control impedance is under the effect of U Δ, produce the magnitude of current counter the send electrical network opposite with decay current amount phase place, two kinds of superimposed cancelling out each other of electric current reach the purpose of administering harmonic wave.
The secondary side three-phase electricity electric current of harmonic wave control current transformer is respectively:
Ina＝K×Ia
Inb＝K×Ib
Inc＝K×Ic
K is a no-load voltage ratio
Secondary side three-phase current sum
IΔ＝Ina+Inb+Inc＝K×(Ija+Ijb+Ijc+Isa+Isb+Isc)
Therefore harmonic excitation amount, attenuation all reflect at the secondary side winding of harmonic wave current transformer XBLQ two ends in parallel or series connection, promptly from system, isolate the magnitude of current of harmonic wave, circuit theory diagrams such as Fig. 2, wherein, Fig. 2 (a) is a series system, and Fig. 2 (b) is a parallel way.It should be noted that the secondary side of harmonic wave current transformer XBLQ can not open a way.
Three-phase oscillatory extinction process is consistent, three phase harmonic evanescent voltage amount, decay current amount Isa, Isb, Isc equate, the harmonic wave control impedance is under the effect of I Δ, produce voltage counter the send electrical network opposite with evanescent voltage amount phase place, two kinds of superimposed cancelling out each other of voltage reach the purpose of administering harmonic wave.
The harmonic wave control controllable impedance, the logical harmonic wave of resistance first-harmonic, or consume harmonic energy, or make harmonic current or the anti-phase system and harmonic current or voltage of sending back to of voltage and system harmonics curtage superpose to cancel out each other and administer harmonic wave by it.
As Fig. 3, harmonic wave control controllable impedance R, its value is to control and be provided with according to the frequency of the contained harmonic wave of system, or be the controllable resistor shown in Fig. 3 (a), or be composed in series for the harmonic wave control branch road parallel connection of a plurality of frequencies shown in Fig. 3 (b) and with controllable resistor R, corresponding to existing certain subharmonic in the system, the controlled conducting of its corresponding harmonic wave control branch road; Also can be the setting of connecting of high pass filter and controllable resistor R shown in Fig. 3 (c), intercept first-harmonic by high pass filter, and by the above harmonic wave of secondary; Can also be the harmonic current negative circuit shown in Fig. 3 (d), or the harmonic voltage shown in Fig. 3 (e) be anti-phase.
In Fig. 3 (a), Fig. 3 (b) and Fig. 3 (c), controllable resistor is to control the size that consumes harmonic content according to the size of harmonic content in the electrical network, approximates harmonic power according to I2R and controls.
Harmonic wave control impedance shown in Fig. 3 (a), Fig. 3 (b), Fig. 3 (c) and Fig. 3 (d) is applicable to that the harmonic wave of the humorous wave transformer XBYQ of employing shown in Figure 1 becomes the mode of sending.
Harmonic wave control impedance shown in Fig. 3 (a) Fig. 3 (e) is applicable to that harmonic wave transmitter shown in Figure 2 is the version of harmonic wave current transformer XBLQ.
Embodiment 1:
As Fig. 4 is that the harmonic wave control transmitter is the embodiment of harmonic wave control transformer, and XBYQ is the harmonic wave control transformer, the primary side connecting system, and secondary side three-phase windings in series forms the three-phase voltage sum, and Z is the harmonic wave control impedance.
Embodiment 2:
As Fig. 5 is that the harmonic wave control transmitter is the embodiment of harmonic wave control current transformer, XBLQ is the harmonic wave control current transformer, primary side seals in system, secondary side three-phase windings in series or the three-phase voltage sum that forms in parallel, Fig. 5 (a) forms the three-phase voltage sum for series connection, and Fig. 5 (b) is the three-phase voltage sum that forms in parallel; Z is the harmonic wave control impedance; BHQ is a protector; when the both end voltage of harmonic wave control current transformer XBLQ output reaches the automatic conducting of protector BHQ in the setting; effect one is to prevent the secondary side of harmonic wave control current transformer XBLQ open circuit; it two is to prevent because the overtension at the value of Z Z two ends when too big punctures equipment, and it three is to prevent that the function of current very big when electrical network is short-circuited can the very high voltage breakdown equipment of generation on Z.
Claims (6)
1, power network harmonic wave management method, it is characterized in that utilizing the harmonic signal transmitter from system, to isolate harmonic wave three-phase voltage or three-phase current signal sum, the harmonic wave transmitter secondary side loop that forms with the controllable impedance that is arranged on harmonic signal transmitter secondary side consumes harmonic energy, or at harmonic wave transmitter secondary side harmonic signal is carried out anti-phasely, again inversion signal is fed back to bucking-out system harmonic content in the system through harmonic wave transmitter primary side.
2, power network harmonic wave management equipment, it is characterized in that being provided with humorous wave transformer (XBYQ), the Y-shaped connection of three phases winding at primary side of described humorous wave transformer (XBYQ), the three phases winding at primary side neutral ground that Y shape connects, each corresponding phase line in the other end difference connecting system of each winding; Secondary side three phase windings of described humorous wave transformer (XBYQ) are end to end and series connection is formed for separating the secondary side loop of harmonic wave three-phase voltage sum, in described secondary side loop or series connection insert controllable impedance, form the harmonic wave transmitter secondary side loop that consumes harmonic energy; Or series connection inserts the harmonic current negative circuit, formation harmonic signal feedback loop.
3, power network harmonic wave management equipment according to claim 2 is characterized in that described controllable impedance is a resistance; Or be that resistance first-harmonic filter circuit and controllable resistor are composed in series.
4, power network harmonic wave management equipment according to claim 2, described resistance first-harmonic filter circuit are the each harmonic resonance branch road that is arranged in parallel and selects conducting, or lead to the high pass filter of harmonic wave for the resistance first-harmonic.
5, power network harmonic wave management equipment, it is characterized in that being provided with harmonic wave current transformer (XBLQ), the primary side of described harmonic wave current transformer (XBLQ) seals in the system, the secondary side loop that the secondary side three phase windings parallel connection of described harmonic wave current transformer (XBLQ) or series connection setting are formed for separating harmonic wave three-phase current sum, in described secondary side loop or middle series connection insert controllable impedance, form the harmonic wave transmitter secondary side loop that consumes harmonic energy; Or series connection inserts the harmonic voltage negative circuit, formation harmonic signal feedback loop.
6, power network harmonic wave management equipment according to claim 5 is characterized in that described controllable impedance is a controllable resistor.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100966953A CN1945918A (en) | 2006-10-18 | 2006-10-18 | Method and device for treating electric grid harmonic wave |
| PCT/CN2007/002944 WO2008046309A1 (en) | 2006-10-18 | 2007-10-12 | A method and a device for managing electric network non-power frequency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100966953A CN1945918A (en) | 2006-10-18 | 2006-10-18 | Method and device for treating electric grid harmonic wave |
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| Publication Number | Publication Date |
|---|---|
| CN1945918A true CN1945918A (en) | 2007-04-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006100966953A Pending CN1945918A (en) | 2006-10-18 | 2006-10-18 | Method and device for treating electric grid harmonic wave |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008046309A1 (en) * | 2006-10-18 | 2008-04-24 | Zhang Yunyi | A method and a device for managing electric network non-power frequency |
| CN102138276A (en) * | 2008-09-02 | 2011-07-27 | 李成高 | Apparatus for automatically controlling harmonic waves |
| CN108777486A (en) * | 2018-06-08 | 2018-11-09 | 浙江涌原新能科技股份有限公司 | A kind of power grid clutter controlling device |
-
2006
- 2006-10-18 CN CNA2006100966953A patent/CN1945918A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008046309A1 (en) * | 2006-10-18 | 2008-04-24 | Zhang Yunyi | A method and a device for managing electric network non-power frequency |
| CN102138276A (en) * | 2008-09-02 | 2011-07-27 | 李成高 | Apparatus for automatically controlling harmonic waves |
| CN108777486A (en) * | 2018-06-08 | 2018-11-09 | 浙江涌原新能科技股份有限公司 | A kind of power grid clutter controlling device |
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