CN102360766A - Controllable transductor with low harmonic - Google Patents
Controllable transductor with low harmonic Download PDFInfo
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- CN102360766A CN102360766A CN2011102606582A CN201110260658A CN102360766A CN 102360766 A CN102360766 A CN 102360766A CN 2011102606582 A CN2011102606582 A CN 2011102606582A CN 201110260658 A CN201110260658 A CN 201110260658A CN 102360766 A CN102360766 A CN 102360766A
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Abstract
The invention discloses a controllable transductor with low harmonic. The controllable transductor disclosed by the invention comprises a controllable transductor iron core, wherein the iron core comprises a center pole, two side poles and a lateral pole; the two ends of the four poles are provided with cross beams, thus forming a magnetic flux loop; the center pole is provided with an alternating current coil L1, the lateral pole is provided with an alternating current coil L2, one of the side poles is provided with a direct current coil L3 and an alternating current coil L4, and the other side pole is provided with a direct current coil L5 and an alternating current coil L6; the two terminals of the alternating current coil L1 serve as the input terminals of the controllable transductor, and the two terminals of the alternating current coil L2 are in short-circuit connection; the dotted terminal of the direct current coil L3 is connected with the dotted terminal of the direct current coil L5, and the unlike terminals of the direction current coils L3 and L5 are connected with the output terminals of a controllable direct current power supply, thus forming a direct current closed loop circuit; and the controllable direct current power supply supplies direct currents to the direct current coils L3 and L5, and the direct current size can be artificially or automatically controlled. The controllable transductor with low harmonic provided by the invention has the advantages of better current and voltage working waveform, slight waveform distortion during device operation and small higher harmonic.
Description
Technical field
The present invention relates to electric power system and send the power transformation technical field, particularly a kind of controllable transducer of low harmonic wave.
Background technology
Along with the continuous development of electric power system, increasingly high to the safe operation of power system requirement, also increasingly high to the requirement of the quality of power supply.But series reactor limiting short-circuit current; But shunt reactor over-voltage; Reactor and electric capacity associating can constitute filter circuit; Reactor is very widely in the application of electric power system.In a part of application, the reactance value of reactor can be fixed; In many applications, need reactance value to change along with the change of power system operation mode.The research and the application of the controlled reactor that can regulate continuously of reactance value in recent years becomes heat subject.Controllable transducer is a kind of important way of controlled reactor.
Controllable transducer is to utilize the saturation characteristic of saturable reactor iron core to change the reactance value of reactor.There have been many controllable transducers to be suggested, a kind of magnetic saturation reactor (patent No. 2010105840411); A kind of saturable reactor (patent No. 2011100409541); A kind of low noise saturable reactor (patent No. 2011100409556); A kind of controllable transducer (patent No. 2011101030585); The saturable reactor of being explained is that the specific adaptation demand limiter requires and the saturable reactor invented, mainly utilizes the switching characteristic of saturable reactor.Patent of invention number is: 2006100476121 " self-feeding controllable transductor ", patent of invention number are: " a kind of rapid-response controllable reactor of self-energy-taking " of 200810011902X, a kind of saturable reactor main body (patent No. 2011100207304); The saturable reactor that a kind of self-excitation type controllable transducer and control method thereof (patent No. 2011100048327) are explained differs from one another, and still, the working volts alternating current of these saturable reactors, current waveform are good inadequately, and the generation wave distortion is also bigger.Chinese Water Conservancy water power publishing house published Cai Xuansan in 2008, and Gao Yuenong work " controllable transducer principle, a design and application " book has been done summary to controllable transducer.The magnet valve type saturable reactor of Soviet citizen's invention in 1986 has improvement to reducing the saturable reactor harmonic wave, and still, the output waveform of magnet valve type saturable reactor still can produce big high order harmonic component, influences the quality of power supply of electric power system.
Summary of the invention
The object of the invention provides a kind of have better electric current and voltage power supply waveform, the controllable transducer that wave distortion and high order harmonic component are very little exactly for addressing the above problem.
For realizing above-mentioned purpose, the present invention adopts following structure:
A kind of controllable transducer of low harmonic wave, it comprises: a controllable transducer iron core, iron core comprises: a newel, two lateral columns, an other post, four pillars are parallel; Said four pillar two ends have crossbeam to constitute flux circuit respectively; Wherein, the crossbeam of newel and other post point-blank, the crossbeam of two lateral columns is on another straight line, two straight lines are vertical each other; Two lateral columns are symmetrically distributed in the newel both sides respectively, and two lateral column sectional areas equate that two lateral column sectional area sums equal the newel sectional area; The sectional area of other post is equal to or less than the newel sectional area; At newel AC coil L1 is arranged, other post has AC coil L2, and a lateral column has dc coil L3, balance coil L4, and another root lateral column has dc coil L5, balance coil L6;
The equal turn numbers of dc coil L3 and dc coil L5, the equal turn numbers of balance coil L4 and flat coil L6; Two terminals of AC coil L1 are respectively two input terminals of controllable transducer, the shorted on both ends of AC coil L2; The end of the same name of balance coil L4 is connected with the end of the same name of balance coil L6, and the different name end of balance coil L4 is connected with the different name end of balance coil L6, and two balance coils form the closed-loop path; The end of the same name of dc coil L3 is connected with the end of the same name of dc coil L5, and the different name end of dc coil L3 is connected with the output of controllable direct current power supply respectively with the different name end of dc coil L5, forms the direct current closed-loop path;
Controllable direct current power supply is connected with dc coil L3, L5 input, direct current is provided for dc coil L3, L5, and the direct current size is through artificial control of controllable direct current power supply or control automatically.
Said AC coil L1 connects electric power system, and when being changed to maximum, the newel iron core of AC coil L1 is unsaturated from zero for the direct current of dc coil L3 and dc coil L5.
Said AC coil L1 connects electric power system, and when the direct current of dc coil L3 and dc coil L5 was zero, AC coil L1 flow through exciting current, and the controllable transducer reactance value is maximum; The direct current that controllable direct current power supply provides for dc coil L3, dc coil L5 increases, and the alternating current that AC coil L1 flows through increases, and the controllable transducer reactance value reduces; When controllable direct current power supply provided the direct current of maximum to dc coil L3, dc coil L5, the alternating current that AC coil L1 flows through had maximum, and the controllable transducer reactance value is minimum; The size of direct current among control dc coil L3, the dc coil L5, the size of the reactance value of control controllable transducer.
The controllable transducer iron core of said low harmonic wave has two main flux closure loops, forms the exchange flux closed-loop path by AC coil L1 and AC coil L2 for one, and another forms the direct current flux closed-loop path by dc coil L3 and dc coil L5; AC coil L1 and AC coil L2 are installed in the different highway sections in exchange flux path, and dc coil L3 and dc coil L5 are installed in the different highway sections in direct current flux path; Two iron core transition junctions of AC coil L1 iron core and AC coil L2 iron core; Two iron core transition junctions of dc coil L3 iron core and dc coil L5 iron core; The exchange flux iron core links to each other with the direct current flux iron core is vertical, and in the junction, the exchange flux direction is vertical each other with the direct current flux direction; The exchange flux that AC coil L1 iron core produces can flow into two one side of something of DC loop from an intersection respectively; After two one side of something are pooled to another intersection, flow back to AC coil L1 iron core then, and form exchange flux closed loop without AC coil L2 iron core.
Go back shunt capacitance C1, overvoltage protector, nonlinear resistance between the input of said dc coil L3 and dc coil L5, wherein, capacitor C 1 makes direct current more steady, and absorbs impulse disturbances voltage; Overvoltage protector is the Power Electronic Circuit of protection controllable direct current power supply, and nonlinear resistance further absorbs pulse surge.
The invention has the beneficial effects as follows: through key invention " shorted on both ends of AC coil L2 ", the equipment that makes other functions is as the saturable reactor purposes, and solved world's common issue with that there is big harmonic wave in saturable reactor.Solving saturable reactor exists the method for big harmonic problem very simple.The innovative point of " shorted on both ends of AC coil L2 " is, after the shorted on both ends of AC coil L2, with the coil of saturable reactor self a kind of electric current of offsetting the saturable reactor high order harmonic component is provided, and corrects the defective of self with the strength of self.Thinking is novel, and effect is remarkable.It controls the size of the direct current of dc coil L3 and dc coil L5 through the control device for high-power power electronic, gets final product the size of the reactance value of continuous control reactor.Do not need special resonator filter circuit, do not need A, B, C three-phase controllable transducer triangle to connect, can eliminate the high order harmonic component that the iron core fractional saturation of dc coil is produced.
Description of drawings
Fig. 1 representes a kind of topological structure and connected mode of controllable transducer of low harmonic wave;
Fig. 2 a is the front view of the main body iron core of the controllable transducer of low harmonic wave;
Fig. 2 b is the end view of the main body iron core of the controllable transducer of low harmonic wave;
Fig. 2 c is the vertical view of the main body iron core of the controllable transducer of low harmonic wave.
Wherein, 1. AC coil terminal I, 2. AC coil terminal II, 3. controllable transducer iron core, 4. overvoltage protection device, 5. nonlinear resistance, 6. controllable direct current power supply, 7. newel, 8. other post, 9. lateral column I, 10. lateral column II.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
A kind of topological structure and connected mode of controllable transducer of low harmonic wave are as shown in Figure 1.Fig. 2 a is the front view of the main body iron core of the controllable transducer of low harmonic wave; Fig. 2 b is the end view of the main body iron core of the controllable transducer of low harmonic wave; Fig. 2 c is the vertical view of the main body iron core of the controllable transducer of low harmonic wave.A kind of controllable transducer of low harmonic wave comprises: a controllable transducer iron core, iron core comprise four pillars, 7, other posts 8 of a newel, and lateral column I9, lateral column II10, four pillars are parallel; Four pillar two ends have crossbeam to constitute flux circuit respectively; The crossbeam of newel 7 and other post 8 point-blank, the crossbeam of lateral column I9 and lateral column II10 is on another straight line, two straight lines are vertical each other; Lateral column I9 and lateral column II10 are symmetrically distributed in newel 7 both sides respectively, and lateral column I9 equates that with lateral column II10 sectional area lateral column I9 and lateral column II10 sectional area sum equal newel 7 sectional areas; The sectional area of other post 8 is equal to or less than newel 7 sectional areas; Newel 7 has AC coil L1, and other post 8 has AC coil L2, and lateral column I9 has dc coil L3, balance coil L4, and lateral column II10 has dc coil L5, balance coil L6; Two terminals of AC coil L1 are two input terminals of controllable transducer, that is: AC coil terminal I1 and AC coil terminal II 2, two terminal short circuits of AC coil L2; The end of the same name of dc coil L3 is connected with the end of the same name of dc coil L5, and the different name terminal of dc coil L3 and the different name terminal of dc coil L5 are connected the lead-out terminal of controllable direct current power supply 6 respectively, forms the direct current closed-loop path; Controllable direct current power supply 6 provides direct current for dc coil L3, dc coil L5, and the direct current size is control or control automatically through controllable direct current power supply 6 people.
The controllable transducer iron core of said low harmonic wave has two main flux closure loops, forms the exchange flux closed-loop path by AC coil L1 and AC coil L2 for one, and another forms the direct current flux closed-loop path by dc coil L3 and dc coil L5; AC coil L1 and AC coil L2 are installed in the different highway sections in exchange flux path, and dc coil L3 and dc coil L5 are installed in the different highway sections in direct current flux path; Two iron core transition junctions of AC coil L1 iron core and AC coil L2 iron core; Two iron core transition junctions of dc coil L3 iron core and dc coil L5 iron core; The exchange flux iron core links to each other with the direct current flux iron core is vertical, and in the junction, the exchange flux direction is vertical each other with the direct current flux direction; The exchange flux that AC coil L1 iron core produces can flow into two one side of something of DC loop from an intersection respectively; After two one side of something are pooled to another intersection, flow back to AC coil L1 iron core then, and form exchange flux closed loop without AC coil L2 iron core.
Said primary winding L1 connects electric power system.When the direct current of dc coil L3 and dc coil L5 is zero, because two terminal short circuits of AC coil L2 stop exchange flux to flow through the other post at AC coil L2 place; The magnetic flux that AC coil L1 produces constitutes flux circuit through newel 7 with lateral column I9 (lateral column II10); Because lateral column I9 and lateral column II10 are symmetrically distributed in newel 7 both sides respectively, lateral column I9 equates that with lateral column II10 sectional area lateral column I9 and lateral column II10 flow through 1/2 exchange flux respectively; Because the direct current of dc coil L3 and dc coil L5 is from zero when being changed to maximum; The newel iron core of AC coil L1 is unsaturated; And lateral column I9 and lateral column II10 sectional area sum equal newel 7 sectional areas, and newel 7 can be unsaturated, and lateral column I9 and lateral column II10 can be unsaturated yet; Primary winding L1 flows through exciting current.
The direct current that controllable direct current power supply provides for dc coil L3, L5 increases, and lateral column I9 and lateral column II10 are saturated in direct current effect lower part, and magnetic resistance increases; The magnetic flux part that AC coil L1 produces constitutes flux circuit through newel 7 with lateral column I9 (lateral column II10); Remaining magnetic flux is through other post 8 circulations; Other post 8 has AC coil L2, and AC coil L2 short circuit will produce the exchange flux that alternating current is offset the other post 8 of flowing through among the AC coil L2; What lateral column I9 and lateral column II10 flow through is AC and DC mixing magnetic flux, the flux waveforms distortion, and AC coil L1 exerted an influence, attempt makes the electric current among the AC coil L1 produce the waveform generation distortion.What other post 8 circulated is remaining magnetic flux after newel total magnetic flux deduction lateral column I9, lateral column II10 magnetic flux and the leakage field; Neither be sinusoidal wave; It also is the magnetic flux of wave distortion; The magnetic flux of other post 8 produces electric current in AC coil L2; Also to the electric current generation effect of AC coil L1, the fundametal compoment of this effect is just in time identical with the effect of lateral column I9 (lateral column II10) magnetic flux fundametal compoment for this electric current, and the higher harmonic components of this effect is just in time opposite with the effect of lateral column I9 (lateral column II10) magnetic flux higher harmonic components; The magnetic flux of lateral column I9 and lateral column II10 distortion is just just in time offset by the current waveform of AC coil L2 on the other post 8 distortion attempt the current waveform distortion attempt that AC coil L1 electric current produces, and makes the current waveform that flows through among the AC coil L1 revert to sinusoidal current.AC coil L2 short circuit, very little to the alternating current impedance among the AC coil L2, the effect that recovers sine-wave current among the AC coil L1 is bigger.Direct current injects controllable transducer dc coil L3, dc coil L5, does not make the electric current among the controllable transducer AC coil L1 produce wave distortion, remains good sine wave.Do not need special resonator filter circuit, do not need A, B, C three-phase controllable transducer triangle to connect, can eliminate the high order harmonic component of the iron core fractional saturation generation in dc coil loop.
The direct current that dc coil L3, dc coil L5 flow through is little, and the electric current of AC coil L2 is little, and the sinusoidal current that will flow through among the AC coil L1 is little.The direct current that dc coil L3, dc coil L5 flow through is big, and the electric current of AC coil L2 is big, and the sinusoidal current that will flow through among the AC coil L1 is big.When controllable direct current power supply provided the direct current of maximum to dc coil L3, dc coil L5, the lateral column I9 and the lateral column II10 degree of depth were saturated, and the magnetic flux part that AC coil L1 produces is slipped away as leakage field, becomes the minimum reactance value of AC coil L1.Remaining magnetic flux flow is crossed AC coil L2, and in AC coil L2, produces maximum current, the corresponding maximum current that becomes among the AC coil L1 of this electric current.Thus it is clear that, the size of direct current, the i.e. size of the reactance value of may command controllable transducer among control dc coil L3, the dc coil L5.
After the lateral column I9 and the lateral column II10 degree of depth are saturated, continue to strengthen the direct current among dc coil L3, the dc coil L5, very little to the variable effect of the reactance value of may command controllable transducer, there is not practical significance; Loss is strengthened.It is thus clear that the maximum direct current that controllable direct current power supply provides for dc coil L3, dc coil L5 is answered appropriate design.Too little, can not give full play to the regulating action of controllable transducer reactance value; Too big, cause the unnecessary loss of controllable transducer.
The exchange flux that AC coil L1 produces flows into two one side of something of DC loop respectively from intersection, and two one side of something have identical core structure, dc coil L3 and dc coil L5 are arranged, the equal turn numbers of said two dc coils on two identical core structures respectively; The exchange flux of AC coil L1 produces induced electromotive force at dc coil L3 and dc coil L5, and dc coil L3 obtains identical voltage with dc coil L5; The end of the same name of dc coil L3 is connected with the end of the same name of dc coil L5; Exchange flux is cancelled out each other at the alternating voltage of dc coil L3 and dc coil L5 generation; Voltage is zero between two different name ends of dc coil, makes alternating voltage not exert an influence to the direct current loop; In order further to reduce the influence of alternating voltage to the direct current loop; Increase balance coil L4, balance coil L6; The number of turn of balance coil L4 equals the number of turn of balance coil L6; The end of the same name of balance coil L4 is connected with the end of the same name of balance coil L6, and the different name end of balance coil L4 is connected with the different name end of balance coil L6; If exchange flux has unbalance voltage at dc coil L3 and dc coil L5; Also produce unbalance voltage at balance coil L4 and balance coil L6 simultaneously; This unbalance voltage produces circulation in the closed loop of balance coil L4 and balance coil L6, to offset the unbalance voltage of dc coil L3 and dc coil L5.The balance coil L4 and the balance coil L6 number of turn are many, balance effective; But, strengthened the transient process of controllable transducer.The balance coil L3 and the balance coil L6 number of turn are few, and the effect of balance is bad.So the number of turn of balance coil L4 and balance coil L6 will be taken all factors into consideration appropriate design.If the unbalance voltage of dc coil L3 and dc coil L5 is not under the too big situation, can cancel balance coil L4 and balance coil L6.
Controllable direct current power supply 6 provides direct current for dc coil L3, L5, and the direct current size can be control or control automatically through controllable direct current power supply 6 people.The direct current of controllable direct current power supply output flows through dc coil L3 and dc coil L5, the direct current flux equal and opposite in direction that dc coil L3 and dc coil L5 produce, and direction is identical; Direct current flux does not flow to the iron core of AC coil L1 and AC coil L2 only in the direct current flux loop circulation of lateral column I9 and lateral column II10 formation.
The input shunt capacitance C1 of dc coil L3 and dc coil L5 can make direct current more steady, and absorbs impulse disturbances voltage; The overvoltage protector 4 of parallel connection can be protected the Power Electronic Circuit of controllable direct current power supply.The nonlinear resistance 5 of parallel connection further absorbs pulse surge.
A kind of controllable transducer of low harmonic wave also can adopt a kind of flexible clutch and the control method (patent No.: 2011100245645), or adopt a kind of voltage and the current regulator (patent No.: the core structure that 2011100881759) proposes thereof.
Because AC coil L2 shorted on both ends, the actual magnetic flux in the other post is very little.The sectional area of other post can be less than newel.
Each parts of the controllable transducer of said a kind of low harmonic wave can manufacture and design with prior art, can realize fully.Broad prospect of application is arranged.
Claims (5)
1. the controllable transducer of a low harmonic wave is characterized in that, it comprises: a controllable transducer iron core, and iron core comprises: a newel, two lateral columns, an other post, four pillars are parallel; Said four pillar two ends have crossbeam to constitute flux circuit respectively; Wherein, the crossbeam of newel and other post point-blank, the crossbeam of two lateral columns is on another straight line, two straight lines are vertical each other; Two lateral columns are symmetrically distributed in the newel both sides respectively, and two lateral column sectional areas equate that two lateral column sectional area sums equal the newel sectional area; The sectional area of other post is equal to or less than the newel sectional area; At newel AC coil L1 is arranged, other post has AC coil L2, and a lateral column has dc coil L3, balance coil L4, and another root lateral column has dc coil L5, balance coil L6;
The equal turn numbers of dc coil L3 and dc coil L5, the equal turn numbers of balance coil L4 and flat coil L6; Two terminals of AC coil L1 are respectively two input terminals of controllable transducer, the shorted on both ends of AC coil L2; The end of the same name of balance coil L4 is connected with the end of the same name of balance coil L6, and the different name end of balance coil L4 is connected with the different name end of balance coil L6, and two balance coils form the closed-loop path; The end of the same name of dc coil L3 is connected with the end of the same name of dc coil L5, and the different name end of dc coil L3 is connected with the output of controllable direct current power supply respectively with the different name end of dc coil L5, forms DC loop;
Controllable direct current power supply is connected with dc coil L3, L5 input, direct current is provided for dc coil L3, L5, and the direct current size is through artificial control of controllable direct current power supply or control automatically.
2. the controllable transducer of a kind of low harmonic wave as claimed in claim 1; It is characterized in that; Said AC coil L1 connects electric power system, and when being changed to maximum, the newel iron core of AC coil L1 is unsaturated from zero for the direct current of dc coil L3 and dc coil L5.
3. the controllable transducer of a kind of low harmonic wave as claimed in claim 1; It is characterized in that said AC coil L1 connects electric power system, when the direct current of dc coil L3 and dc coil L5 is zero; AC coil L1 flows through exciting current, and the controllable transducer reactance value is maximum; The direct current that controllable direct current power supply provides for dc coil L3, dc coil L5 increases, and the alternating current that AC coil L1 flows through increases, and the controllable transducer reactance value reduces; When controllable direct current power supply provided the direct current of maximum to dc coil L3, dc coil L5, the alternating current that AC coil L1 flows through had maximum, and the controllable transducer reactance value is minimum; The size of direct current among control dc coil L3, the dc coil L5, the size of the reactance value of control controllable transducer.
4. the controllable transducer of a kind of low harmonic wave as claimed in claim 1; It is characterized in that; The controllable transducer iron core of said low harmonic wave has two main flux closure loops; Article one, form the exchange flux closed-loop path by AC coil L1 and AC coil L2, another forms the direct current flux closed-loop path by dc coil L3 and dc coil L5; AC coil L1 and AC coil L2 are installed in the different highway sections in exchange flux path, and dc coil L3 and dc coil L5 are installed in the different highway sections in direct current flux path; Two iron core transition junctions of AC coil L1 iron core and AC coil L2 iron core; Two iron core transition junctions of dc coil L3 iron core and dc coil L5 iron core; The exchange flux iron core links to each other with the direct current flux iron core is vertical, and in the junction, the exchange flux direction is vertical each other with the direct current flux direction; The exchange flux that AC coil L1 iron core produces also flows into two one side of something of DC loop respectively from an intersection; After two one side of something are pooled to another intersection, flow back to AC coil L1 iron core then, and form exchange flux closed loop without AC coil L2 iron core.
5. the controllable transducer of a kind of low harmonic wave as claimed in claim 1; It is characterized in that, go back shunt capacitance C1, overvoltage protector, nonlinear resistance between the input of said dc coil L3 and dc coil L5, wherein; Capacitor C 1 makes direct current more steady, and absorbs impulse disturbances voltage; Overvoltage protector is the Power Electronic Circuit of protection controllable direct current power supply, and nonlinear resistance further absorbs pulse surge.
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| CN2011102606582A CN102360766A (en) | 2011-09-05 | 2011-09-05 | Controllable transductor with low harmonic |
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| CN2011102606582A CN102360766A (en) | 2011-09-05 | 2011-09-05 | Controllable transductor with low harmonic |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2273072Y (en) * | 1996-07-25 | 1998-01-21 | 魏书庆 | Electro-control earthing arc extinguishing arrangement |
| US20100194516A1 (en) * | 2007-09-11 | 2010-08-05 | Atsushi Sato | Core for reactors, its manufacturing method, and reactor |
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- 2011-09-05 CN CN2011102606582A patent/CN102360766A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2273072Y (en) * | 1996-07-25 | 1998-01-21 | 魏书庆 | Electro-control earthing arc extinguishing arrangement |
| US20100194516A1 (en) * | 2007-09-11 | 2010-08-05 | Atsushi Sato | Core for reactors, its manufacturing method, and reactor |
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Application publication date: 20120222 |