CN102064759A - Self-excited controllable saturation resistor and control method thereof - Google Patents
Self-excited controllable saturation resistor and control method thereof Download PDFInfo
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Abstract
The invention discloses a self-excited controllable saturation resistor and a control method thereof. The self-excited controllable saturation resistor comprises at least one iron core of the magnetic saturation resistor and a control circuit, wherein at least one coil L1 and at least one coil L2 are respectively arranged on the two sides of the iron core of the magnetic saturation resistor; one end of the coil L1 is directly connected with one end of the coil L2, and is used as an input terminal of the magnetic saturation resistor; the other end of the coil L1 is connected with a forward diode D1 in series, and is then connected with an output terminal; the other end of the coil L2 is connected with a backward diode D2 in series, and is then connected to the output terminal; the two ends of the forward diode D1 are connected with a reversed thyristor D3 in parallel, and the two ends of the backward diode D2 are connected with a reversed thyristor D4 in parallel; and the output ends of the control circuit are respectively connected with the control ends of the thyristor D3 and the thyristor D4. The control circuit can adjust the conduction degree of the thyristor D3 and the thyristor D4 so as to continuously adjust the reactance value of the controllable saturation resistor. The self-excited controllable saturation resistor has the advantages of no need of any direct current coils, lighter weight, smaller loss and simpler circuit structure.
Description
Technical field
The present invention relates to electric power system and send the power transformation technical field, particularly a kind of self-excitation type controllable transducer and control method thereof.
Background technology
Along with the continuous development of electric power system, more and more higher to the safe operation of power system requirement, the requirement of the quality of power supply is also more and more higher.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.Had many controllable transducers to be suggested, patent of invention number is: 2006100476121 " self-feeding controllable transductor " and patent of invention number are: 200810011902X " a kind of rapid-response controllable reactor of self-energy-taking " proposed two kinds of controllable transducers.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 also been done summary to controllable transducer.The various controllable transducers that propose differ from one another, still, and the direct current control loop complexity of these controllable transducers, less, the function singleness of the reactance value adjustable range of reactor capacity less, reactor.
Patent of invention number is: the thyristor that 2011100012024 " a kind of controllable transducer and control method thereof " proposed a kind of a pair of reverse parallel connection is parallel between two inputs of full bridge rectifier; The thyristor conducting amount of reverse parallel connection is little, and the reactance value of controllable transducer is little; The thyristor conducting amount of reverse parallel connection is big, and the reactance value of controllable transducer is big, regulates the method that the thyristor conducting amount of reverse parallel connection can be regulated the controllable transducer reactance value continuously continuously.And have that control device is withstand voltage very little, the reactance value adjustable range of reactor is big, the capacity of reactor is big, diverse in function, fail safe advantage preferably.But this controllable transducer and control method thereof still need dc coil, and weight is heavier, and loss is bigger, and the direct current control loop is still simple inadequately.
Summary of the invention
Purpose of the present invention provides a kind of self-excitation type controllable transducer and control method thereof exactly for addressing the above problem, and it has does not need dc coil, and weight is lighter, and loss is less, the simple more advantage of circuit structure.
For achieving the above object, the present invention adopts following technical scheme:
A kind of self-excitation type controllable transducer, it comprises:
At least one magnetic saturation reactor iron core; The magnetic saturation reactor iron core is provided with at least one coil L1 and at least one coil L2; The end of coil L1 directly is connected with the end of coil L2, and as the input terminal of device; Be connected to lead-out terminal behind forward diode D1 of other end series connection of coil L1; Be connected to lead-out terminal behind backward diode D2 of other end series connection of coil L2;
The two ends of forward diode D1 reverse thyristor D3 in parallel; The two ends of backward diode D2 reverse thyristor D4 in parallel;
A control circuit, the output of control circuit are connected with the control end of thyristor D4 with thyristor D3 respectively.
A kind of self-excitation type controllable transducer is characterized in that it comprises:
At least one magnetic saturation reactor iron core; The magnetic saturation reactor iron core is provided with at least one coil L1 and at least one coil L2; The end of coil L1 directly is connected with the end of coil L2, and as the input terminal of device; Be connected to lead-out terminal behind forward diode D1 of other end series connection of coil L1; Be connected to lead-out terminal behind backward diode D2 of other end series connection of coil L2;
A pair of reverse thyristor D3 also in parallel and thyristor D4 between two outputs of coil L1 and coil L2;
A control circuit, the output of control circuit are connected with the control end of thyristor D4 with thyristor D3 respectively.
Described magnetic saturation reactor iron core is a day font structure, is axle with middle iron core center line, bilateral symmetry; Middle iron core forms the magnetic flux closed loop with a side iron core wherein, and middle iron core and opposite side iron core form another magnetic flux closed loop; Form the 3rd magnetic flux closed loop between the iron core of both sides; The sectional area of both sides iron core equates; The sectional area of middle iron core equals the sectional area sum of both sides iron core; Magnetic saturation reactor iron core both sides are installed at least one coil L1 and at least one coil L2 respectively.
Described magnetic saturation reactor iron core 3 is the four-column type iron core, and the sectional area of four pillars equates that four pillars can form the flux closure loop mutually; The shortest two pillars in centre are installed at least one coil L1 and at least one coil L2 respectively in the flux closure loop.
Described magnetic saturation reactor coil L1 and coil L3 structure, the number of turn are identical.
Long-pending and the core structure of the number of turn of described magnetic saturation reactor coil L1, L2 and the core section of magnetic saturation reactor iron core, should satisfy: magnetic saturation reactor coil L1 adds under the condition of work voltage with two ends after L2 is in parallel, and coil L1 and L2 flow through normal exciting current.
Described control circuit can be from 0 ° to 180 ° the conducting amount of scope continuous control thyristor D3, control circuit 10 milliseconds after thyristor D3 sends out trigger impulse are that power frequency is also sent out trigger impulse to thyristor D4 for 180 °, make thyristor D3 and thyristor D4 conducting respectively successively; The trigger angle of thyristor D3 and thyristor D4 hour, the conducting amount of thyristor D3 and thyristor D4 is big; When the trigger angle of thyristor D3 and thyristor D4 was big, the conducting amount of thyristor D3 and thyristor D4 was little.
Described control circuit can be from 0 ° to 180 ° the conducting amount of scope continuous control thyristor D4, control circuit 10 milliseconds after thyristor D4 sends out trigger impulse are that power frequency is also sent out trigger impulse to thyristor D3 for 180 °, make thyristor D4 and thyristor D3 conducting respectively successively; The trigger angle of thyristor D4 and thyristor D3 hour, the conducting amount of thyristor D4 and thyristor D3 is big; When the trigger angle of thyristor D4 and thyristor D3 was big, the conducting amount of thyristor D4 and thyristor D3 was little.
A kind of control method of self-excitation type controllable transducer, control circuit are regulated the size of thyristor D3 and thyristor D4 conducting degree by the size of the trigger angle of control thyristor D3 and thyristor D4, thereby regulate the reactance value of controllable transducer continuously;
Its concrete control procedure is:
When control circuit triggers thyristor D3 and thyristor D4 complete shut-down is disconnected; The positive half wave electric current flows into coil L1 and flows to lead-out terminal through the forward diode D1 of series connection, and negative half-wave current can not flow in coil L1; Negative half-wave current flows into coil L2 and flows to lead-out terminal through the backward diode D2 of series connection, and the positive half wave electric current can not flow in coil L2; The ratio of the DC component of electric current has maximum among coil L1 and the coil L2; The reactance of controllable transducer coil is the minimum value of device;
When control circuit progressively reduces the trigger angle of thyristor, thyristor D3 and thyristor D4 progressively strengthen the conducting amount from the disconnected state of complete shut-down, and the ratio of the DC component of electric current reduces gradually among coil L1 and the coil L2; The reactance value of controllable transducer coil becomes big gradually from the minimum value of device;
When control circuit triggering thyristor D5 and the full conducting of thyristor D6, it is in parallel with coil L2 to be equivalent to coil L1; The DC component of electric current is zero among coil L1 and the coil L2; Coil L1 and L2 flow through normal exciting current, and the reactance of controllable transducer coil is the maximum of device.
The invention has the beneficial effects as follows: it has does not need dc coil, and weight is lighter, and loss is less, the simple more advantage of circuit structure.
Description of drawings
Fig. 1 represents a kind of self-excitation type controllable transducer structure and connected mode;
Fig. 2 represents the another kind of structure and the connected mode of self-excitation type controllable transducer.
Fig. 3 represents the another kind of structure and the connected mode of self-excitation type controllable transducer.
Wherein, 1. input terminal, 2. lead-out terminal, 3. magnetic saturation reactor iron core, 4. control circuit.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing and embodiment.
Embodiment 1:
A kind of structure of self-excitation type controllable transducer and connected mode are as shown in Figure 1.A magnetic saturation reactor iron core 3; Magnetic saturation reactor iron core 3 is a day font structure; Magnetic saturation reactor iron core 3 both sides are installed coil L1 and coil L2 respectively; The end of coil L1 is connected with the end of coil L2, and as the input terminal 1 of device; Be connected to lead-out terminal 2 behind forward diode D1 of other end series connection of coil L1; Be connected to lead-out terminal 2 behind backward diode D2 of other end series connection of coil L2;
The two ends of the diode that is connected with a coil L1 thyristor D3 with diode reverse in parallel; The two ends of the diode that is connected with a coil L2 thyristor D4 with diode reverse in parallel; A control circuit 4, the output of control circuit 4 are connected with the thyristor D3 of reverse parallel connection and the control end of thyristor D4 respectively.
Described magnetic saturation reactor iron core font structure on the 3rd is an axle with middle iron core center line, bilateral symmetry; Middle iron core forms the magnetic flux closed loop with a side iron core wherein, and middle iron core and opposite side iron core form another magnetic flux closed loop; The both sides iron core forms the 3rd magnetic flux closed loop; The sectional area of both sides iron core equates; The sectional area of middle iron core equals the sectional area sum of both sides iron core.
Described magnetic saturation reactor coil L1 and coil L3 structure, the number of turn are identical.
Long-pending and the core structure of the number of turn of described magnetic saturation reactor coil L1, L2 and the core section of magnetic saturation reactor iron core, should satisfy: magnetic saturation reactor coil L1 adds under the condition of work voltage with two ends after L2 is in parallel, and coil L1 and L2 flow through normal exciting current.
Described thyristor D3 and thyristor D4 two ends are power-frequency voltage; The control circuit 4 of controllable transducer can be from 0 ° to 180 ° the conducting amount of scope continuous control thyristor D3, control circuit 4 (also can send the pulse of setting out to thyristor D4 earlier to thyristor D3, the all corresponding change of trigger sequence gets final product) send out behind the trigger impulse 10 milliseconds be that power frequency is also sent out trigger impulse to thyristor D4 for 180 °, make thyristor D3 and thyristor D4 conducting respectively successively; The trigger angle of thyristor D3 and thyristor D4 hour, the conducting amount of thyristor D3 and thyristor D4 is big; When the trigger angle of thyristor D3 and thyristor D4 was big, the conducting amount of thyristor D3 and thyristor D4 was little.
When control circuit 4 triggers thyristor D3 and thyristor D4 complete shut-down is disconnected; The positive half wave electric current flows into coil L1 and flows to lead-out terminal 2 through the forward diode D1 of series connection, and negative half-wave current can not flow in coil L1; Negative half-wave current flows into coil L2 and flows to lead-out terminal 2 through the backward diode D2 of series connection, and the positive half wave electric current can not flow in coil L2; The alternating current of inflow device, the positive half wave electric current flows from coil L1, and negative half-wave current flows from coil L2, and the electric current that flows out from terminal 2 is again complete alternating current.The positive half wave electric current flows from coil L1, so, direct-current component and alternating current component that big positive direction is arranged among the coil L1, negative half-wave current flows from coil L2, so, bigger reciprocal direct-current component and alternating current component are arranged among the coil L2, and the ratio of the DC component of electric current there is maximum among coil L1 and the coil L2.If the end of the same name of coil L1 is connected with the end of the same name of coil L2, the magnetic flux that the direct current of positive direction produces at iron core among the coil L1 by the iron core column at coil L1 place through day font structure iron core intermediolateral column constitute the closed-loop path; The magnetic flux that reciprocal direct current produces at iron core among the coil L2 by the iron core column at coil L2 place through day font structure iron core intermediolateral column constitute the closed-loop path.The sectional area of both sides iron core equates that the sectional area of middle iron core equals the sectional area sum of both sides iron core; So the iron core at coil L1 and coil L2 place is in darker saturation condition.The impedance that alternating current component runs in the coil L1 positive half wave electric current is less, and the impedance that alternating current component runs in the negative half-wave current of coil L2 is less; The reactance of controllable transducer coil is the minimum value of device.
When control circuit 4 progressively reduces the trigger angle of thyristor, thyristor D3 and thyristor D4 progressively strengthen the conducting amount from the disconnected state of complete shut-down, and the ratio of the DC component of electric current reduces gradually among coil L1 and the coil L2; The reactance value of controllable transducer coil becomes big gradually from the minimum value of device;
When control circuit triggering thyristor D3 and the full conducting of thyristor D4, it is in parallel with coil L2 to be equivalent to coil L1; The DC component of electric current is zero among coil L1 and the coil L2; Coil L1 and L2 flow through normal exciting current, and the reactance of controllable transducer coil is the maximum of device.
The size of the trigger angle of control circuit control thyristor D3 and thyristor D4 is regulated the size of thyristor D3 and thyristor D4 conducting degree, thereby regulates the reactance value of controllable transducer continuously.
If the end of the same name of coil L1 is connected with the end of the same name of coil L2, the direct-current component among coil L1 and the coil L2 forms the direct current flux closed loop at middle iron core and a side iron core wherein, and middle iron core and opposite side iron core form another direct current flux closed loop; Alternating current component among coil L1 and the coil L2 forms the 3rd exchange flux closed loop at the both sides iron core; The 3rd exchange flux closed loop flows through coil L1 and coil L2 simultaneously, and beneficial effect is to reduce the AC excitation electric current, or reduces the coil L1 and the coil L2 number of turn.Unfavorable factor is that the controllable transducer output waveform is poor slightly.
If the end of the same name of coil L1 is connected with the different name end of coil L2, the direct-current component among coil L1 and the coil L2 forms the direct current flux closed loop at the both sides iron core; The alternating current component of coil L1 forms the exchange flux closed loop at coil place iron core and middle iron core, and the alternating current component of coil L2 forms the exchange flux closed loop at coil place iron core and middle iron core; Beneficial effect is that the controllable transducer output waveform is better.Unfavorable factor is that the AC excitation electric current of the reactance of controllable transducer coil L1 and coil L2 is bigger.So the connected mode of coil L1 and coil L2 need be selected according to applicable cases.
The connection in series-parallel of a kind of self-excitation type controllable transducer is used in electric power system, when need improving the minimum reactance value of self-excitation type controllable transducer, and can be in thyristor D3 and the thyristor D4 two ends impedance that equates in parallel respectively.A kind of self-excitation type controllable transducer is series at transmitting loop and uses, and in the time of need reducing the minimum reactance value of self-excitation type controllable transducer, can increase dc coil on the magnetic saturation reactor iron core.For example: adopt patent of invention number to be: 2010105753926 " current limiting device and method with flexible switch characteristic " proposed a kind of current limiting device and method.
Embodiment 2:
Self-excitation type controllable transducer structure and connected mode can also be as shown in Figure 2.
It comprises:
At least one magnetic saturation reactor iron core 3; At least one coil L1 and at least one coil L2 are installed respectively in magnetic saturation reactor iron core 3 both sides; The end of coil L1 directly is connected with the end of coil L2, and as the input terminal 1 of device; Be connected to lead-out terminal 2 behind forward diode D1 of other end series connection of coil L1; Be connected to lead-out terminal 2 behind backward diode D2 of other end series connection of coil L2;
A pair of reverse thyristor D3 also in parallel and thyristor D4 between two outputs of coil L1 and coil L2;
A control circuit 4, the output of control circuit 4 are connected with the control end of thyristor D4 with thyristor D3 respectively.
Embodiment 3:
Self-excitation type controllable transducer structure and connected mode can also be as shown in Figure 3.
It comprises:
At least one magnetic saturation reactor iron core 3; Magnetic saturation reactor iron core 3 is the four-column type iron core, and the sectional area of four pillars equates that four pillars can form the flux closure loop mutually; The shortest two pillars in centre are installed at least one coil L1 and at least one coil L2 respectively in the flux closure loop; The end of coil L1 directly is connected with the end of coil L2, and as the input terminal 1 of device; Be connected to lead-out terminal 2 behind forward diode D1 of other end series connection of coil L1; Be connected to lead-out terminal 2 behind backward diode D2 of other end series connection of coil L2;
The two ends of forward diode D1 reverse thyristor D3 in parallel; The two ends of backward diode D2 reverse thyristor D4 in parallel;
A control circuit 4, the output of control circuit 4 are connected with the control end of thyristor D4 with thyristor D3 respectively.
Each parts of self-excitation type controllable transducer of the present invention and method can manufacture and design with prior art, can realize fully.Broad prospect of application is arranged.
Claims (10)
1. self-excitation type controllable transducer is characterized in that it comprises:
At least one magnetic saturation reactor iron core; The magnetic saturation reactor iron core has at least one coil L1 and at least one coil L2; The end of coil L1 directly is connected with the end of coil L2, and as the input terminal of device; Be connected to lead-out terminal behind forward diode D1 of other end series connection of coil L1; Be connected to lead-out terminal behind backward diode D2 of other end series connection of coil L2;
The two ends of forward diode D1 reverse thyristor D3 in parallel; The two ends of backward diode D2 reverse thyristor D4 in parallel;
A control circuit, the output of control circuit are connected with the control end of thyristor D4 with thyristor D3 respectively.
2. self-excitation type controllable transducer is characterized in that it comprises:
At least one magnetic saturation reactor iron core; The magnetic saturation reactor iron core is provided with at least one coil L1 and at least one coil L2; The end of coil L1 directly is connected with the end of coil L2, and as the input terminal of device; Be connected to lead-out terminal behind forward diode D1 of other end series connection of coil L1; Be connected to lead-out terminal behind backward diode D2 of other end series connection of coil L2;
A pair of reverse thyristor D3 also in parallel and thyristor D4 between two outputs of coil L1 and coil L2;
A control circuit, the output of control circuit are connected with the control end of thyristor D4 with thyristor D3 respectively.
3. self-excitation type controllable transducer as claimed in claim 1 or 2 is characterized in that, described magnetic saturation reactor iron core is a day font structure, is axle with middle iron core center line, bilateral symmetry; Middle iron core forms the magnetic flux closed loop with a side iron core wherein, and middle iron core and opposite side iron core form another magnetic flux closed loop; Form the 3rd magnetic flux closed loop between the iron core of both sides; The sectional area of both sides iron core equates; The sectional area of middle iron core equals the sectional area sum of both sides iron core; Magnetic saturation reactor iron core both sides are installed at least one coil L1 and at least one coil L2 respectively.
4. self-excitation type controllable transducer as claimed in claim 1 or 2 is characterized in that, described magnetic saturation reactor iron core 3 is the four-column type iron core, and the sectional area of four pillars equates that four pillars can form the flux closure loop mutually; The shortest two pillars in centre are installed at least one coil L1 and at least one coil L2 respectively in the flux closure loop.
5. self-excitation type controllable transducer as claimed in claim 1 or 2 is characterized in that, described magnetic saturation reactor coil L1 and coil L3 structure, the number of turn are identical.
6. self-excitation type controllable transducer as claimed in claim 5, it is characterized in that, long-pending and the core structure of the number of turn of described magnetic saturation reactor coil L1, L2 and the core section of magnetic saturation reactor iron core, should satisfy: magnetic saturation reactor coil L1 adds under the condition of work voltage with two ends after L2 is in parallel, and coil L1 and L2 flow through normal exciting current.
7. self-excitation type controllable transducer as claimed in claim 1 or 2, it is characterized in that, the conducting amount of described control circuit scope continuous control thyristor D3 from 0 ° to 180 °, control circuit 10 milliseconds after thyristor D3 sends out trigger impulse are that power frequency is also sent out trigger impulse to thyristor D4 for 180 °, make thyristor D3 and thyristor D4 conducting respectively successively; The trigger angle of thyristor D3 and thyristor D4 hour, the conducting amount of thyristor D3 and thyristor D4 is big; When the trigger angle of thyristor D3 and thyristor D4 was big, the conducting amount of thyristor D3 and thyristor D4 was little.
8. self-excitation type controllable transducer as claimed in claim 1 or 2, it is characterized in that, the conducting amount of described control circuit scope continuous control thyristor D4 from 0 ° to 180 °, control circuit 10 milliseconds after thyristor D4 sends out trigger impulse are that power frequency is also sent out trigger impulse to thyristor D3 for 180 °, make thyristor D4 and thyristor D3 conducting respectively successively; The trigger angle of thyristor D4 and thyristor D3 hour, the conducting amount of thyristor D4 and thyristor D3 is big; When the trigger angle of thyristor D4 and thyristor D3 was big, the conducting amount of thyristor D4 and thyristor D3 was little.
9. control method that adopts claim 1 or 2 described self-excitation type controllable transducers, it is characterized in that, control circuit is by the size of the trigger angle of control thyristor D3 and thyristor D4, regulate the size of thyristor D3 and thyristor D4 conducting degree, thereby regulate the reactance value of controllable transducer continuously;
10. the method for work of a kind of self-excitation type controllable transducer as claimed in claim 9 is characterized in that, its concrete control procedure is:
When control circuit triggers thyristor D3 and thyristor D4 complete shut-down is disconnected; The positive half wave electric current flows into coil L1 and flows to lead-out terminal through the forward diode D1 of series connection, and negative half-wave current can not flow in coil L1; Negative half-wave current flows into coil L2 and flows to lead-out terminal through the backward diode D2 of series connection, and the positive half wave electric current can not flow in coil L2; The ratio of the DC component of electric current has maximum among coil L1 and the coil L2; The reactance of controllable transducer coil is the minimum value of device;
When control circuit progressively reduces the trigger angle of thyristor, thyristor D3 and thyristor D4 progressively strengthen the conducting amount from the disconnected state of complete shut-down, and the ratio of the DC component of electric current reduces gradually among coil L1 and the coil L2; The reactance value of controllable transducer coil becomes big gradually from the minimum value of device;
When control circuit triggering thyristor D5 and the full conducting of thyristor D6, it is in parallel with coil L2 to be equivalent to coil L1; The DC component of electric current is zero among coil L1 and the coil L2; Coil L1 and L2 flow through normal exciting current, and the reactance of controllable transducer coil is the maximum of device.
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| CN102244492A (en) * | 2011-07-13 | 2011-11-16 | 国网电力科学研究院 | Excitation method of self-excited magnetic-valve controllable reactor and apparatus thereof |
| CN105830182A (en) * | 2013-12-10 | 2016-08-03 | 西门子公司 | Device and method for reducing a magnetic unidirectional flux component in the core of a three-phase transformer |
| WO2016141614A1 (en) * | 2015-03-09 | 2016-09-15 | 山东大学 | Saturable reactor having simple structure |
| CN109755945A (en) * | 2019-04-02 | 2019-05-14 | 郑州大学 | A kind of magnet controlled reactor based on pulse current control |
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| CN201364801Y (en) * | 2009-02-12 | 2009-12-16 | 张帆 | Flux cancellation reactor |
| CN101710820A (en) * | 2009-12-21 | 2010-05-19 | 中国电力科学研究院 | Dynamic analog device for graded controllable parallel reactors and test method thereof |
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| JPS5914367A (en) * | 1982-07-15 | 1984-01-25 | Hitachi Ltd | Parallel device for inverters |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102244492A (en) * | 2011-07-13 | 2011-11-16 | 国网电力科学研究院 | Excitation method of self-excited magnetic-valve controllable reactor and apparatus thereof |
| CN105830182A (en) * | 2013-12-10 | 2016-08-03 | 西门子公司 | Device and method for reducing a magnetic unidirectional flux component in the core of a three-phase transformer |
| CN105830182B (en) * | 2013-12-10 | 2018-07-10 | 西门子公司 | For reducing the device and method of the unidirectional flux component in the iron core of three-phase transformer |
| US10297383B2 (en) | 2013-12-10 | 2019-05-21 | Siemens Aktiengesellschaft | Device and method for reducing a magnetic unidirectional flux component in the core of a three-phase transformer |
| WO2016141614A1 (en) * | 2015-03-09 | 2016-09-15 | 山东大学 | Saturable reactor having simple structure |
| CN109755945A (en) * | 2019-04-02 | 2019-05-14 | 郑州大学 | A kind of magnet controlled reactor based on pulse current control |
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| CN102064759B (en) | 2012-06-27 |
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